This implements runtime support for buffered write barriers on amd64.
The buffered write barrier has a fast path that simply enqueues
pointers in a per-P buffer. Unlike the current write barrier, this
fast path is *not* a normal Go call and does not require the compiler
to spill general-purpose registers or put arguments on the stack. When
the buffer fills up, the write barrier takes the slow path, which
spills all general purpose registers and flushes the buffer. We don't
allow safe-points or stack splits while this frame is active, so it
doesn't matter that we have no type information for the spilled
registers in this frame.
One minor complication is cgocheck=2 mode, which uses the write
barrier to detect Go pointers being written to non-Go memory. We
obviously can't buffer this, so instead we set the buffer to its
minimum size, forcing the write barrier into the slow path on every
call. For this specific case, we pass additional information as
arguments to the flush function. This also requires enabling the cgo
write barrier slightly later during runtime initialization, after Ps
(and the per-P write barrier buffers) have been initialized.
The code in this CL is not yet active. The next CL will modify the
compiler to generate calls to the new write barrier.
This reduces the average cost of the write barrier by roughly a factor
of 4, which will pay for the cost of having it enabled more of the
time after we make the GC pacer less aggressive. (Benchmarks will be
in the next CL.)
Updates #14951.
Updates #22460.
Change-Id: I396b5b0e2c5e5c4acfd761a3235fd15abadc6cb1
Reviewed-on: https://go-review.googlesource.com/73711
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Currently systemstack always calls its argument, even if we're already
on the system stack. Unfortunately, traceback with _TraceJump stops at
the first systemstack it sees, which often cuts off runtime stacks
early in profiles.
Fix this by performing a tail call if we're already on the system
stack. This eliminates it from the traceback entirely, so it won't
stop prematurely (or all get mushed into a single node in the profile
graph).
Change-Id: Ibc69e8765e899f8d3806078517b8c7314da196f4
Reviewed-on: https://go-review.googlesource.com/74050
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This adds support for math Abs, Copysign to be instrinsics on ppc64x.
New instruction FCPSGN is added to generate fcpsgn. Some new
rules are added to improve the int<->float conversions that are
generated mainly due to the Float64bits and Float64frombits in
the math package. PPC64.rules is also modified as suggested
in the review for CL 63290.
Improvements:
benchmark old ns/op new ns/op delta
BenchmarkAbs-16 1.12 0.69 -38.39%
BenchmarkCopysign-16 1.30 0.93 -28.46%
BenchmarkNextafter32-16 9.34 8.05 -13.81%
BenchmarkFrexp-16 8.81 7.60 -13.73%
Others that used Copysign also saw smaller improvements.
I attempted to make this work using rules since that
seems to be preferred, but due to the use of Float64bits and
Float64frombits in these functions, several rules had to be added and
even then not all cases were matched. Using rules became too
complicated and seemed too fragile for these.
Updates #21390
Change-Id: Ia265da9a18355e08000818a4fba1a40e9e031995
Reviewed-on: https://go-review.googlesource.com/67130
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Keith Randall <khr@golang.org>
Errors occur in runtime test testCgoPprofPIE when the test
is built by passing -pie to the external linker with code
that was not built as PIC. This occurs on ppc64le because
non-PIC is the default, and fails only on newer distros
where the address range used for programs is high enough
to cause relocation overflow. This test should be built
with -buildmode=pie since that correctly generates PIC
with -pie.
Related issues are #21954 and #22126.
Updates #22459
Change-Id: Ib641440bc9f94ad2b97efcda14a4b482647be8f7
Reviewed-on: https://go-review.googlesource.com/73970
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This pragma is not actually honored by the compiler.
The tests implicitly relied on the inliner being unable
to inline closures with captured variables, which will
soon change.
Fixes#22208
Change-Id: I13abc9c930b9156d43ec216f8efb768952a29439
Reviewed-on: https://go-review.googlesource.com/73211
Reviewed-by: Michael Munday <mike.munday@ibm.com>
If runtime.GOROOT() and the os.Executable method for finding GOROOT
find the same directory but with different spellings, prefer the spelling
returned by runtime.GOROOT().
This avoids an inconsistency if "pwd" returns one spelling but a
different spelling is used in $PATH (and therefore in os.Executable()).
make.bash runs with GOROOT=$(cd .. && pwd); the goal is to allow
the resulting toolchain to use that default setting (unless moved)
even if the directory spelling is different in $PATH.
Change-Id: If96b28b9e8697f4888f153a400b40bbf58a9128b
Reviewed-on: https://go-review.googlesource.com/74250
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
recordspan has two remaining write barriers from writing to the
pointer to the backing store of h.allspans. However, h.allspans is
always backed by off-heap memory, so let the compiler know this.
Unfortunately, this isn't quite as clean as most go:notinheap uses
because we can't directly name the backing store of a slice, but we
can get it done with some judicious casting.
For #22460.
Change-Id: I296f92fa41cf2cb6ae572b35749af23967533877
Reviewed-on: https://go-review.googlesource.com/73414
Reviewed-by: Rick Hudson <rlh@golang.org>
Currently copy and append for types containing only scalars and
notinheap pointers still get compiled to have write barriers, even
though those write barriers are unnecessary. Fix these to use
HasHeapPointer instead of just Haspointer so that they elide write
barriers when possible.
This fixes the unnecessary write barrier in runtime.recordspan when it
grows the h.allspans slice. This is important because recordspan gets
called (*very* indirectly) from (*gcWork).tryGet, which is
go:nowritebarrierrec. Unfortunately, the compiler's analysis has no
hope of seeing this because it goes through the indirect call
fixalloc.first, but I saw it happen.
Change-Id: Ieba3abc555a45f573705eab780debcfe5c4f5dd1
Reviewed-on: https://go-review.googlesource.com/73413
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Currently (*Type).HasHeapPointer only ignores pointers go:notinheap
types if the type itself is a pointer to a go:notinheap type. However,
if it's some other type that contains pointers where all of those
pointers are go:notinheap, it will conservatively return true. As a
result, we'll use write barriers where they aren't needed, for example
calling typedmemmove instead of just memmove on structs that contain
only go:notinheap pointers.
Fix this by making HasHeapPointer walk the whole type looking for
pointers that aren't marked go:notinheap.
Change-Id: Ib8c6abf6f7a20f34969d1d402c5498e0b990be59
Reviewed-on: https://go-review.googlesource.com/73412
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Most write barrier calls are inserted by SSA, but copy and append are
lowered to runtime.typedslicecopy during walk. Fix these to set
Func.WBPos and emit the "write barrier" warning, as done for the write
barriers inserted by SSA. As part of this, we refactor setting WBPos
and emitting this warning into the frontend so it can be shared by
both walk and SSA.
Change-Id: I5fe9997d9bdb55e03e01dd58aee28908c35f606b
Reviewed-on: https://go-review.googlesource.com/73411
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The crypto.Signer interface takes pre-hased messages for ECDSA and RSA,
but the argument in the implementations was called “msg”, not “digest”,
which is confusing.
This change renames them to help clarify the intended use.
Change-Id: Ie2fb8753ca5280e493810d211c7c66223f94af88
Reviewed-on: https://go-review.googlesource.com/70950
Reviewed-by: Filippo Valsorda <hi@filippo.io>
The current go:nowritebarrierrec checker has two problems that limit
its coverage:
1. It doesn't understand that systemstack calls its argument, which
means there are several cases where we fail to detect prohibited write
barriers.
2. It only observes calls in the AST, so calls constructed during
lowering by SSA aren't followed.
This CL completely rewrites this checker to address these issues.
The current checker runs entirely after walk and uses visitBottomUp,
which introduces several problems for checking across systemstack.
First, visitBottomUp itself doesn't understand systemstack calls, so
the callee may be ordered after the caller, causing the checker to
fail to propagate constraints. Second, many systemstack calls are
passed a closure, which is quite difficult to resolve back to the
function definition after transformclosure and walk have run. Third,
visitBottomUp works exclusively on the AST, so it can't observe calls
created by SSA.
To address these problems, this commit splits the check into two
phases and rewrites it to use a call graph generated during SSA
lowering. The first phase runs before transformclosure/walk and simply
records systemstack arguments when they're easy to get. Then, it
modifies genssa to record static call edges at the point where we're
lowering to Progs (which is the latest point at which position
information is conveniently available). Finally, the second phase runs
after all functions have been lowered and uses a direct BFS walk of
the call graph (combining systemstack calls with static calls) to find
prohibited write barriers and construct nice error messages.
Fixes#22384.
For #22460.
Change-Id: I39668f7f2366ab3c1ab1a71eaf25484d25349540
Reviewed-on: https://go-review.googlesource.com/72773
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
We're about to start tracking nowritebarrierrec through systemstack
calls, which detects that we're calling markroot (which has write
barriers) from gchelper, which is called from the scheduler during STW
apparently without a P.
But it turns out that func helpgc, which wakes up blocked Ms to run
gchelper, installs a P for gchelper to use. This means there *is* a P
when gchelper runs, so it is allowed to have write barriers. Tell the
compiler this by marking gchelper go:yeswritebarrierrec. Also,
document the call to gchelper so I don't have to spend another half a
day puzzling over how on earth this could possibly work before
discovering the spooky action-at-a-distance in helpgc.
Updates #22384.
For #22460.
Change-Id: I7394c9b4871745575f87a2d4fbbc5b8e54d669f7
Reviewed-on: https://go-review.googlesource.com/72772
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
We're about to start tracking nowritebarrierrec through systemstack
calls, which will reveal write barriers in persistentalloc prohibited
by various callers.
The pointers manipulated by persistentalloc are always to off-heap
memory, so this removes these write barriers statically by introducing
a new go:notinheap type to represent generic off-heap memory.
Updates #22384.
For #22460.
Change-Id: Id449d9ebf145b14d55476a833e7f076b0d261d57
Reviewed-on: https://go-review.googlesource.com/72771
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
We're about to start tracking nowritebarrierrec through systemstack
calls, which will reveal write barriers in startpanic_m prohibited by
various callers.
We actually can allow write barriers here because the write barrier is
a no-op when we're panicking. Let the compiler know.
Updates #22384.
For #22460.
Change-Id: Ifb3a38d3dd9a4125c278c3680f8648f987a5b0b8
Reviewed-on: https://go-review.googlesource.com/72770
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Currently most of these are marked go:nowritebarrier as a hint, but
it's actually important that these not invoke write barriers
recursively. The danger is that some gcWork method would invoke the
write barrier while the gcWork is in an inconsistent state and that
the write barrier would in turn invoke some other gcWork method, which
would crash or permanently corrupt the gcWork. Simply marking the
write barrier itself as go:nowritebarrierrec isn't sufficient to
prevent this if the write barrier doesn't use the outer method.
Thankfully, this doesn't cause any build failures, so we were getting
this right. :)
For #22460.
Change-Id: I35a7292a584200eb35a49507cd3fe359ba2206f6
Reviewed-on: https://go-review.googlesource.com/72554
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Currently, newstack and gogo have write barriers for maintaining the
context register saved in g.sched.ctxt. This is troublesome, because
newstack can be called from go:nowritebarrierrec places that can't
allow write barriers. It happens to be benign because g.sched.ctxt
will always be nil on entry to newstack *and* it so happens the
incoming ctxt will also always be nil in these contexts (I
think/hope), but this is playing with fire. It's also desirable to
mark newstack go:nowritebarrierrec to prevent any other, non-benign
write barriers from creeping in, but we can't do that right now
because of this one write barrier.
Fix all of this by observing that g.sched.ctxt is really just a saved
live pointer register. Hence, we can shade it when we scan g's stack
and otherwise move it back and forth between the actual context
register and g.sched.ctxt without write barriers. This means we can
save it in morestack along with all of the other g.sched, eliminate
the save from newstack along with its troublesome write barrier, and
eliminate the shenanigans in gogo to invoke the write barrier when
restoring it.
Once we've done all of this, we can mark newstack
go:nowritebarrierrec.
Fixes#22385.
For #22460.
Change-Id: I43c24958e3f6785b53c1350e1e83c2844e0d1522
Reviewed-on: https://go-review.googlesource.com/72553
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
On linux/amd64, for now.
Updates #16706
Change-Id: Ib8c89b6edc73fb88042c06873ff815d387491504
Reviewed-on: https://go-review.googlesource.com/69117
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This is ugly but needed on the builders, because they do not set
PWD/GOROOT consistently, and the new content-based staleness
understands that the setting of GOROOT influences the content in
the linker outputs.
Change-Id: I0606f2c70b719619b188864ad3ae1b34432140cb
Reviewed-on: https://go-review.googlesource.com/74070
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Header.WriteSubset uses a sync.Pool but wouldn't Put the sorter back in
the pool if there was an error writing to the io.Writer
I'm not really sure why the sorter is returned to begin with. The
comment says "for possible return to headerSorterCache".
This also doesn't address potential panics that might occur, but the
overhead of doing the Put in a defer would likely be too great.
Change-Id: If3c45a4c3e11f6ec65d187e25b63455b0142d4e3
Reviewed-on: https://go-review.googlesource.com/73910
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
New relocation flavor R_DWARFFILEREF, to be applied to DWARF attribute
values that correspond to file references (ex: DW_AT_decl_file,
DW_AT_call_file). The LSym for this relocation is the file itself; the
linker replaces the relocation target with the index of the specified
file in the line table's file section.
Note: for testing purposes this patch changes the DWARF function
subprogram DIE abbrev to include DW_AT_decl_file (allowed by DWARF
but not especially useful) so as to have a way to test this
functionality. This attribute will be removed once there are other
file reference attributes (coming as part of inlining support).
Change-Id: Icf676beb60fcc33f06d78e747ef717532daaa3ba
Reviewed-on: https://go-review.googlesource.com/73330
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
The compiler depends on the way heap and sort break ties
in some cases. Instead of trying to find them all, bundle
those packages into the bootstrap compiler builds.
The overall goal is that Go1.4 building cmd/compile during the
bootstrap process produces a semantically equivalent compiler
to cmd/compile compiling itself. After this CL, that property is true,
at least for the compiler compiling itself and the other tools.
A test for this property will be in CL 73212.
Change-Id: Icc1ba7cbe828f5673e8198ebacb18c7c01f3a735
Reviewed-on: https://go-review.googlesource.com/73952
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This will let us build the latest sort when bootstrapping the compiler.
The compiler depends on the precise tie-breaks used by sort in
some cases, and it's easier to bring sort along than require checking
every sort call ever added to the compiler.
Change-Id: Idc622f89aedbb40d848708c76650fc28779d0c3c
Reviewed-on: https://go-review.googlesource.com/73951
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Don't pass -gdwarf-2 to the external linker when external linkage is
requested. The Go compiler is now emitting DWARF version 4, so this
doesn't seem needed any more.
Fixes#22455
Change-Id: Ic4122c55e946619a266430f2d26f06d6803dd232
Reviewed-on: https://go-review.googlesource.com/73672
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
env.MkEnv was computing the full gcc command line to report as
$GOGCCFLAGS in "go env" output, which meant running gcc (or clang)
multiple times to discern which flags are available.
We also set $GOGCCFLAGS in the environment, but nothing actually uses
that as far as I can tell - it was always intended only for debugging.
Move GOGCCFLAGS to env.ExtraEnvVars, which displayed in "go env"
output but not set in child processes and not computed nearly as
often.
The effect is that trivial commands like "go help" or "go env GOARCH"
or "go tool -n compile" now run in about 0.01s instead of 0.1s,
because they no longer run gcc 4 times each.
go test -short cmd/go drops from 81s to 44s (and needs more trimming).
The $GOROOT/test suite drops from 92s to 33s, because the number of
gcc invocation drops from 13,336 to 0.
Overall, all.bash drops from 5m53s to 4m07s wall time.
Change-Id: Ia85abc89e1e2bb126b933aff3bf7c5f6c0984cd5
Reviewed-on: https://go-review.googlesource.com/73850
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Directly return error instead of assigning to err and then returning.
Change-Id: Ie5c466cac70cc6d52ee72ebba3e497e0da8a5797
Reviewed-on: https://go-review.googlesource.com/73531
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Function sqDiff is called multiple times in the hot path (x, y loops) of
drawPaletted from the image/draw package; number of sqDiff calls is
between 4×width×height and 4×width×height×len(palette) for each
drawPaletted call.
Simplify this function by removing arguments comparison and relying
instead on signed to unsigned integer conversion rules and properties of
unsigned integer values operations guaranteed by the spec:
> For unsigned integer values, the operations +, -, *, and << are
> computed modulo 2n, where n is the bit width of the unsigned integer's
> type. Loosely speaking, these unsigned integer operations discard high
> bits upon overflow, and programs may rely on ``wrap around''.
image/gif package benchmark that depends on the code updated shows
throughput improvements:
name old time/op new time/op delta
QuantizedEncode-4 788ms ± 2% 468ms ± 9% -40.58% (p=0.000 n=9+10)
name old speed new speed delta
QuantizedEncode-4 1.56MB/s ± 2% 2.63MB/s ± 8% +68.47% (p=0.000 n=9+10)
Closes#22375.
Change-Id: Ic9a540e39ceb21e7741d308af1cfbe61b4ac347b
Reviewed-on: https://go-review.googlesource.com/72373
Reviewed-by: Nigel Tao <nigeltao@golang.org>
1. Move AXXX constants (A-enumeration) from "a.out.go" to "aenum.go"
2. Move VEX-encoded optabs from "asm6.go" to "vex_optabs.go"
Also run "go generate" over aenum.go. This explains diff in "anames.go".
Initialization of opindex is split into 2 loops:
one for `vexOptab`, second for `optab`.
Rationale:
when VEX instructions are generated with current structure,
asm6.go is modified, which can lead to merge conflicts and
larger diffs than desired. Same for a.out.go.
This change makes x86avxgen usage possible:
https://go-review.googlesource.com/c/arch/+/66972
Change-Id: Id9eefcf5ccf0a89440e5d01bcb80926a8163b41d
Reviewed-on: https://go-review.googlesource.com/70630
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TestParallelRWMutexReaders has a non-preemptible loop in it that can
deadlock if GC triggers. "Fix" it like we've fixed similar tests.
Updates #10958.
Change-Id: I13618f522f5ef0c864e7171ad2f655edececacd7
Reviewed-on: https://go-review.googlesource.com/73710
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This picks up a few changes and should stop the macOS crashes.
Fixes#22456.
Change-Id: I7e0aae119a5564fcfaa16eeab7422bdd5ff0497b
Reviewed-on: https://go-review.googlesource.com/73691
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This change adds a Square root method to the big.Float type, with
signature
(z *Float) Sqrt(x *Float) *Float
Fixes#20460
Change-Id: I050aaed0615fe0894e11c800744600648343c223
Reviewed-on: https://go-review.googlesource.com/67830
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Both the linker and the plugin package were inconsistent
about when they applied the path encoding defined in
objabi.PathToPrefix. As a result, only some symbols from
a package path that required encoding were being found.
So always encoding the path.
Fixes#22295
Change-Id: Ife86c79ca20b2e9307008ed83885e193d32b7dc4
Reviewed-on: https://go-review.googlesource.com/72390
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
...because that's an illegal addressing mode.
I double-checked handling of this code, and 387 is the only
place where this check is missing.
Fixes#22429
Change-Id: I2284fe729ea86251c6af2f04076ddf7a5e66367c
Reviewed-on: https://go-review.googlesource.com/73551
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
drawPaletted has to discover R,G,B,A color values of each source image
pixel in a given rectangle. Doing that by calling image.Image.At()
method returning color.Color interface is quite taxing allocation-wise
since interface values go through heap. Introduce special cases for some
concrete source types by fetching color values using type-specific
methods.
name old time/op new time/op delta
Paletted-4 7.62ms ± 4% 3.72ms ± 3% -51.20% (p=0.008 n=5+5)
name old alloc/op new alloc/op delta
Paletted-4 480kB ± 0% 0kB ± 0% -99.99% (p=0.000 n=4+5)
name old allocs/op new allocs/op delta
Paletted-4 120k ± 0% 0k ± 0% -100.00% (p=0.008 n=5+5)
Updates #15759.
Change-Id: I0ce1770ff600ac80599541aaad4c2c826855c8fb
Reviewed-on: https://go-review.googlesource.com/72370
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Not perfect, but it's a start.
Change-Id: I3283385223a39ea73567b0130290bfe4de69d018
Reviewed-on: https://go-review.googlesource.com/73552
Reviewed-by: Robert Griesemer <gri@golang.org>
CL 39570 added support for automatically setting flag bit 11 to
indicate that the filename and comment fields are encoded in UTF-8,
which is (conventionally) the encoding using for most Go strings.
However, the detection added is too lose for two reasons:
* We need to ensure both fields are at least possibly UTF-8.
That is, if any field is definitely not UTF-8, then we can't set the bit.
* The utf8.ValidRune returns true for utf8.RuneError, which iterating
over a Go string automatically returns for invalid UTF-8.
Thus, we manually check for that value.
Updates #22367
Updates #10741
Change-Id: Ie8aae388432e546e44c6bebd06a00434373ca99e
Reviewed-on: https://go-review.googlesource.com/72791
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
CL 40112 intended to allow full flag processing in go vet, but missed
vet's -shift flag; this corrects the omission.
Fixes#22442
Change-Id: I47525018306bd8b9aa452fb378d0d45319f8cf11
Reviewed-on: https://go-review.googlesource.com/73553
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Replace any nested Writer that is a MultiWriter with its associated
Writers.
Fixes#22431
Change-Id: Ida7c4c83926363c1780689e216cf0c5241a5b8eb
Reviewed-on: https://go-review.googlesource.com/73470
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This test was previously disabled when external linking was
unsupported on ppc64le. It should still be disabled on ppc64
since there is no cgo or external linking there, but I removed
the if test for GOARCH=ppc64 since the initial test for cgo
enabled will cause it to be skipped on ppc64.
Fixes#22360
Change-Id: I5a0e3e4a1bd71ac7bf0ed0c792f7b78fb4a5e100
Reviewed-on: https://go-review.googlesource.com/73510
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This adds a Noop() function to the net/stmp client.
It allows for testing if a connaction is still healthy.
Fixes#22321
Change-Id: I023b613b1536ea21274cc36d41f5720c9bbdecbc
Reviewed-on: https://go-review.googlesource.com/71650
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This change adds the syscall.Conn interface to Listener types, with the caveat that only RawConn.Control is supported. Custom socket options can now be set safely.
Updates #19435Fixes#22065
Change-Id: I7e74780d00318dc54a923d1c628a18a36009acab
Reviewed-on: https://go-review.googlesource.com/71651
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Previously scanning time.Time into a *time.Time required reflection.
Now it does not. Scanning already checked if the source value was of
type time.Time. The only addition was checking the destination was
of type *time.Time.
Existing tests already scan time.Time into *time.Time, so no new
tests were added. Linked issue has performance justification.
Fixes#22300
Change-Id: I4eea461c78fad71ce76e7677c8503a1919666931
Reviewed-on: https://go-review.googlesource.com/73232
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Add SetDeadline, SetReadDeadline, and SetWriteDeadline methods to os.File,
just as they exist today for the net package.
Fixes#22114
Change-Id: I4d390d739169b991175baba676010897dc8568fa
Reviewed-on: https://go-review.googlesource.com/71770
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Russ pointed out in a previous CL golang.org/cl/65731 that not only
was the locking incomplete, previous changes did not correctly
lock driver calls in other sections. After inspecting
driverConn, driverStmt, driverResult, Tx, and Rows structs
where driver interfaces are stored, I discovered a few more places
that failed to lock driver calls. The largest of these
was the parameter type converter "driverArgs".
driverArgs was typically called right before another call to the
driver in a locked region, so I made the entire driverArgs expect
a locked driver mutex and combined the region. This should not
be a problem because the connection is pulled out of the connection
pool either way so there shouldn't be contention.
Fixes#21117
Change-Id: I88d46f74dca25fb11a30f0bf8e79785a73133d23
Reviewed-on: https://go-review.googlesource.com/71433
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Otherwise low-res timers cause problems at call sites that expect to
be able to use 0 as meaning "no time set" and therefore expect that
nanotime never returns 0 itself. For example, sched.lastpoll == 0
means no last poll.
Fixes#22394.
Change-Id: Iea28acfddfff6f46bc90f041ec173e0fea591285
Reviewed-on: https://go-review.googlesource.com/73410
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
The BigEndian constant is only used in boolean context so assign it
boolean constants.
Change-Id: If19d61dd71cdfbffede1d98b401f11e6535fba59
Reviewed-on: https://go-review.googlesource.com/73270
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Change-Id: I6b16cfcbe824f999c9b64df539deea567e327db7
Reviewed-on: https://go-review.googlesource.com/73090
Reviewed-by: Gabriel Aszalos <gabriel.aszalos@gmail.com>
Reviewed-by: Jason Wangsadinata <jwangsadinata@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Gabriel Aszalos <gabriel.aszalos@gmail.com>
The new pagezero_size introduced by CL 72730 breaks
on 32-bit systems, since it is 2³². Restrict the change to
darwin/arm64, since it is intended for iOS only.
We could plausibly allow GOARCH=amd64 as well, but
without a compelling reason, changing the zero page size
doesn't seem worth the risk.
Change-Id: I5d6adcbaff8d0e5b169ff13512f188332cc7ed9a
Reviewed-on: https://go-review.googlesource.com/73250
Run-TryBot: Russ Cox <rsc@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
The record delimiter (not configurable by user) is "\r\n" or "\n".
It is insensible for the user to set Comma or Comment delimiters
to be some character that conflicts with the record delimiter.
Furthermore, it is insensible for Comma or Comment to be the same rune.
Allowing this leaks implementation details to the user in regards to
the evaluation order of which rune is checked for first.
Fixes#22404
Change-Id: I31e86abc9b3a8fb4584e090477795587740970ae
Reviewed-on: https://go-review.googlesource.com/72793
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL expands the job of "dist bootstrap" to be "finish make.bash".
I need to change that logic in upcoming CLs related to cmd/go
changes, and I'd rather not change it in three places in three different
shell script languages.
Change-Id: I545dc215e408289e4d0b28f7c2ffcd849d89ad3b
Reviewed-on: https://go-review.googlesource.com/72870
Reviewed-by: David Crawshaw <crawshaw@golang.org>
There is some stuff I don't understand very well involved in SSUB, better words
for the documentation gratefully accepted.
As this is the last use of a bit in SMASK, kill that off too.
Change-Id: Iddff1c9b2af02c9dfb12ac8e668d004e4642f997
Reviewed-on: https://go-review.googlesource.com/42026
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Rounding ties to even is statistically useful for some applications.
This implementation completes IEEE float64 rounding mode support (in
addition to Round, Ceil, Floor, Trunc).
This function avoids subtle faults found in ad-hoc implementations, and
is simple enough to be inlined by the compiler.
Fixes#21748
Change-Id: I09415df2e42435f9e7dabe3bdc0148e9b9ebd609
Reviewed-on: https://go-review.googlesource.com/61211
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Eliminates lots of ad hoc code for recognizing the same thing in
different ways.
Passes toolstash-check.
Change-Id: Ic0bb005308e96331b4ef30f455b860e476725b61
Reviewed-on: https://go-review.googlesource.com/73190
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
A single database connection ususally maps to a single session.
A connection pool is logically also a session pool. Most
sessions have a way to reset the session state which is desirable
to prevent one bad query from poisoning another later query with
temp table name conflicts or other persistent session resources.
It also lets drivers provide users with better error messages from
queryies when the underlying transport or query method fails.
Internally the driver connection should now be marked as bad, but
return the actual connection. When ResetSession is called on the
connection it should return driver.ErrBadConn to remove it from
the connection pool. Previously drivers had to choose between
meaningful error messages or poisoning the connection pool.
Lastly update TestPoolExhaustOnCancel from relying on a
WAIT query fixing a flaky timeout issue exposed by this
change.
Fixes#22049Fixes#20807
Change-Id: I2b5df6d954a38d0ad93bf1922ec16e74c827274c
Reviewed-on: https://go-review.googlesource.com/73033
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Instead of the hand-written control flow analysis in debug info
generation, use a reverse postorder traversal, which is basically the
same thing. It should be slightly faster.
More importantly, the previous version simply gave up in the case of
non-reducible functions, and produced output that caused a later stage
to crash. It turns out that there's a non-reducible function in
compress/flate, so that wasn't a theoretical issue.
With this change, all blocks will be visited, even for non-reducible
functions.
Change-Id: Id47536764ee93203c6b4105a1a3013fe3265aa12
Reviewed-on: https://go-review.googlesource.com/73110
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This reverts commit 2620ac3aea.
Reason for revert: broke all the builds.
Change-Id: I26fc09a13f5f80fa708de66c843442ff9d934694
Reviewed-on: https://go-review.googlesource.com/73050
Reviewed-by: Russ Cox <rsc@golang.org>
Fix a bug introduced in patch 2 of
https://go-review.googlesource.com/72630 (sense of a map
lookup test was accidentally flipped).
Change-Id: Icc6096ee50be4605fa7542b9fd855c13b8aff090
Reviewed-on: https://go-review.googlesource.com/72850
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
A single database connection ususally maps to a single session.
A connection pool is logically also a session pool. Most
sessions have a way to reset the session state which is desirable
to prevent one bad query from poisoning another later query with
temp table name conflicts or other persistent session resources.
It also lets drivers provide users with better error messages from
queryies when the underlying transport or query method fails.
Internally the driver connection should now be marked as bad, but
return the actual connection. When ResetSession is called on the
connection it should return driver.ErrBadConn to remove it from
the connection pool. Previously drivers had to choose between
meaningful error messages or poisoning the connection pool.
Lastly update TestPoolExhaustOnCancel from relying on a
WAIT query fixing a flaky timeout issue exposed by this
change.
Fixes#22049Fixes#20807
Change-Id: Idffa1a7ca9ccfe633257c4a3ae299b864f46c5b6
Reviewed-on: https://go-review.googlesource.com/67630
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Drivers shouldn't need to implement both Queryer and QueryerContext,
they should just implement QueryerContext. Same with Execer and
ExecerContext. This CL tests for QueryContext and ExecerContext
first so drivers do not need to implement Queryer and Execer
with an empty definition.
Fixes#21663
Change-Id: Ifbaa71da669f4bc60f8da8c41a04a4afed699a9f
Reviewed-on: https://go-review.googlesource.com/65733
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This change modifies go to create iOS arm64 binaries that pass iTunes
upload validation. Tested with xcode 9.0.1 macOS 10.13.
Fixes#22402.
Change-Id: I3f14c6ac85065e2da88d06edc8682947f6f1cd47
Reviewed-on: https://go-review.googlesource.com/72730
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Also includes all derived values as well as
vendored packages.
Generated by running
UNICODE_VERSION=10.0.0 go generate
in golang.org/x/text
and modified by hand to add the tests and
entries in next.txt for new script and properties.
Closes Issue #21471
Change-Id: I1d10ee3887bd1fd3d5a756ee0d04bd6ec2814ba1
Reviewed-on: https://go-review.googlesource.com/63953
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>
The ErrQuote variable is only returned when a parsing error
occurs within a quoted string. Make that clear in the message.
Change-Id: I06ad5a9edb41afedde193c4f8b93551bb8342bbb
Reviewed-on: https://go-review.googlesource.com/72794
Reviewed-by: Avelino <t@avelino.xxx>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
We should be referring to ParseError.Err, which is the underlying error,
not ParseError.Error, which is the error method.
Change-Id: Ic3cef5ecbe1ada5fa14b9573222f29da8fc9a8d5
Reviewed-on: https://go-review.googlesource.com/72450
Reviewed-by: Tim Cooper <tim.cooper@layeh.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Make netpollopen return what Windows GetLastError API returns.
It is probably copy / paste error from long time ago.
Change-Id: I28f78718c15fef3e8b5f5d11a259533d7e9c6185
Reviewed-on: https://go-review.googlesource.com/72592
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
If n.Type==nil after typechecking, then we should have already
reported a more useful error somewhere else. Just return 0 in
evalunsafe without trying to do anything else that's likely to cause
problems.
Also, further split out issue7525.go into more test files, because
cmd/compile reports at most one typechecking loop per compilation
unit.
Fixes#22351.
Change-Id: I3ebf505f72c48fcbfef5ec915606224406026597
Reviewed-on: https://go-review.googlesource.com/72251
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Robert Griesemer <gri@golang.org>
decoder.decode() was defering close of lzw.decoders created for each
frame in a loop, thus increasing heap usage (referenced object + defered
function) until decode() returns. Memory increased proportionally to the
number of frames. Fix this by moving the sImageDescriptor case block
into its own method.
Fixes#22237
Change-Id: I819617ea7e539e13c04bc11112f339645391ddb9
Reviewed-on: https://go-review.googlesource.com/70370
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
When enhanced DWARF location list generation is enabled (via internal
option -dwarflocationlists), variable entries were missing for "large"
(non-decomposable) locals and formals. From the debugging perspective,
this makes it appear that the variable doesn't exist, which is
probably not what we want. This change insures that a formal/local DIE
is created for these vars (with correct type, line, etc) but with a
conservative ("no info") location.
Change-Id: I10b2e9a51a60c7b4c748e987cdec5f2d8b2837d5
Reviewed-on: https://go-review.googlesource.com/72630
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
The addressing mode of global variable was missing, whereas the
compiler may make use of it, causing "illegal combination" error.
This CL adds support of that addressing mode.
Fixes#22390.
Change-Id: Ic8eade31aba73e6fb895f758ee7f277f8f1832ef
Reviewed-on: https://go-review.googlesource.com/72610
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
* replace a copy of IsMethod with a call of it.
* a few more switches where they simplify the code.
* prefer composite literals over "n := new(...); n.x = y; ...".
* use defers to get rid of three goto labels.
* rewrite updateHasCall into two funcs to remove gotos.
Passes toolstash-check on std cmd.
Change-Id: Icb5442a89a87319ef4b640bbc5faebf41b193ef1
Reviewed-on: https://go-review.googlesource.com/72070
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Currently, benchmarking compile performance under -l=4 is confounded
by -l=2 enabling eager typechecking of unused inline function bodies
for debugging. This isn't logically an "inlining aggressiveness"
level, so instead move this logic under the -d umbrella flag.
Change-Id: I713f68952efbe25b6941d3ebc2f3707ccbbd6240
Reviewed-on: https://go-review.googlesource.com/72253
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Increasing the map size with the benchmark iteration count
introduced non-linearities and made benchmark runs slow when
increasing benchtime.
Rework the benchmark to use a map size independent of the
iteration count and instead re-fill it when it becomes empty.
Fixes#21546
Change-Id: Iafb6eb225e81830263f30b3aba0d449c361aec32
Reviewed-on: https://go-review.googlesource.com/57650
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Previously, the code would only check (w*h), not (w*h*bpp).
Fixes#22304
Change-Id: Iaca26d916fe4b894d460448c416b1e0b9fd68e44
Reviewed-on: https://go-review.googlesource.com/72350
Reviewed-by: Rob Pike <r@golang.org>
CL 72150 fixes#22352 by reverting the problematic parts of that CL
where the line number and column number were inconsistent with each other.
This CL adds back functionality to address the issue that CL 72150
was trying to solve in the first place. That is, it reports the starting
line of the record, so that users have a frame of reference to start with
when debugging what went wrong.
In the event of gnarly CSV files with multiline quoted strings, a parse
failure likely occurs somewhere between the start of the record and
the point where the parser finally detected an error.
Since ParserError.{Line,Column} reports where the *error* occurs, we
add a RecordLine field to report where the record starts.
Also take this time to cleanup and modernize TestRead.
Fixes#19019Fixes#22352
Change-Id: I16cebf0b81922c35f75804c7073e9cddbfd11a04
Reviewed-on: https://go-review.googlesource.com/72310
Reviewed-by: Ian Lance Taylor <iant@golang.org>
For #22095
Change-Id: Idcfdfe8a94db8626392658bb93429454238f648a
Reviewed-on: https://go-review.googlesource.com/70835
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
windows version of Pipe function is implemented by calling
syscall.Pipe which returns handles inheritable by client process,
and then adjusting returned handles with syscall.CloseOnExec.
Just create non-inheritable handles in the first place.
Now that we don't have a race window in the code, drop use
of syscall.ForkLock.
Change-Id: Ie325da7c2397b5995db4a5ddb0117e2ce1745187
Reviewed-on: https://go-review.googlesource.com/72010
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
NewEncoder returns an io.Writer that writes all incoming bytes as
hexadecimal characters to the underlying io.Writer. NewDecoder returns an
io.Reader that does the inverse.
Fixes#21590
Change-Id: Iebe0813faf365b42598f19a9aa41768f571dc0a8
Reviewed-on: https://go-review.googlesource.com/70210
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
For #22095
Change-Id: Iba3dffc782cecc15ea0e90a971a2734729984945
Reviewed-on: https://go-review.googlesource.com/70834
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
For #22095
Change-Id: Ica6b3391541fe5a0355620d7c4a5107cf53eee82
Reviewed-on: https://go-review.googlesource.com/70833
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The Reader implementation is slow because it operates on a rune-by-rune
basis via bufio.Reader.ReadRune. We speed this up by operating on entire
lines that we read from bufio.Reader.ReadSlice.
In order to ensure that we read the full line, we augment ReadSlice
in our Reader.readLine method to automatically expand the slice if
bufio.ErrBufferFull is every hit.
This change happens to fix#19410 because it no longer relies on
rune-by-rune parsing and only searches for the relevant delimiter rune.
In order to keep column accounting simple and consistent, this change
reverts parts of CL 52830.
This CL is an alternative to CL 36270 and builds on some of the ideas
from that change by Diogo Pinela.
name old time/op new time/op delta
Read-8 3.12µs ± 1% 2.54µs ± 2% -18.76% (p=0.000 n=10+9)
ReadWithFieldsPerRecord-8 3.12µs ± 1% 2.53µs ± 1% -18.91% (p=0.000 n=9+9)
ReadWithoutFieldsPerRecord-8 3.13µs ± 0% 2.57µs ± 3% -18.07% (p=0.000 n=10+10)
ReadLargeFields-8 52.3µs ± 1% 5.3µs ± 2% -89.93% (p=0.000 n=10+9)
ReadReuseRecord-8 2.05µs ± 1% 1.40µs ± 1% -31.48% (p=0.000 n=10+9)
ReadReuseRecordWithFieldsPerRecord-8 2.05µs ± 1% 1.41µs ± 0% -31.03% (p=0.000 n=10+9)
ReadReuseRecordWithoutFieldsPerRecord-8 2.06µs ± 1% 1.40µs ± 1% -31.70% (p=0.000 n=9+10)
ReadReuseRecordLargeFields-8 50.9µs ± 0% 4.1µs ± 3% -92.01% (p=0.000 n=10+10)
name old alloc/op new alloc/op
Read-8 664B ± 0% 664B ± 0%
ReadWithFieldsPerRecord-8 664B ± 0% 664B ± 0%
ReadWithoutFieldsPerRecord-8 664B ± 0% 664B ± 0%
ReadLargeFields-8 3.94kB ± 0% 3.94kB ± 0%
ReadReuseRecord-8 24.0B ± 0% 24.0B ± 0%
ReadReuseRecordWithFieldsPerRecord-8 24.0B ± 0% 24.0B ± 0%
ReadReuseRecordWithoutFieldsPerRecord-8 24.0B ± 0% 24.0B ± 0%
ReadReuseRecordLargeFields-8 2.98kB ± 0% 2.98kB ± 0%
name old allocs/op new allocs/op
Read-8 18.0 ± 0% 18.0 ± 0%
ReadWithFieldsPerRecord-8 18.0 ± 0% 18.0 ± 0%
ReadWithoutFieldsPerRecord-8 18.0 ± 0% 18.0 ± 0%
ReadLargeFields-8 24.0 ± 0% 24.0 ± 0%
ReadReuseRecord-8 8.00 ± 0% 8.00 ± 0%
ReadReuseRecordWithFieldsPerRecord-8 8.00 ± 0% 8.00 ± 0%
ReadReuseRecordWithoutFieldsPerRecord-8 8.00 ± 0% 8.00 ± 0%
ReadReuseRecordLargeFields-8 12.0 ± 0% 12.0 ± 0%
Updates #22352
Updates #19019Fixes#16791Fixes#19410
Change-Id: I31c27cfcc56880e6abac262f36c947179b550bbf
Reviewed-on: https://go-review.googlesource.com/72150
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
On systems that use kqueue, we always register descriptors for both
EVFILT_READ and EVFILT_WRITE. On at least FreeBSD and OpenBSD, when
the write end of a pipe is registered for EVFILT_READ and EVFILT_WRITE
events, and the read end of the pipe is closed, kqueue reports an
EVFILT_READ event with EV_EOF set, but does not report an EVFILT_WRITE
event. Since the write to the pipe is waiting for an EVFILT_WRITE
event, closing the read end of a pipe can cause the write end to hang
rather than attempt another write which will fail with EPIPE.
Fix this by treating EVFILT_READ with EV_EOF set as making both reads
and writes ready to proceed.
The real test for this is in CL 71770, which tests using various
timeouts with pipes.
Updates #22114
Change-Id: Ib23fbaaddbccd8eee77bdf18f27a7f0aa50e2742
Reviewed-on: https://go-review.googlesource.com/71973
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Since inlining budget calculation is fixed in CL 70151
runtime.nextFreeFast is no longer inlineable on MIPS64x because
it does not support Ctz64 as intrinsic. Skip the test.
Updates #22239.
Change-Id: Id00d55628ddb4b48d27aebfa10377a896765d569
Reviewed-on: https://go-review.googlesource.com/72271
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This hack existed because cmd/go used to install (write) and then run
cmd/cgo in the same invocation, and writing and then running a program
is a no-no in modern multithreaded Unix programs (see #22315).
As of CL 68338, cmd/go no longer installs any programs that it then
tries to use. It never did this for any program other than cgo, and
CL 68338 removed that special case for cgo.
Now this special case, added for #3001 long ago, can be removed too.
Change-Id: I338f1f8665e9aca823e33ef7dda9d19f665e4281
Reviewed-on: https://go-review.googlesource.com/71571
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
It uses the build ID, which is soon to be internal to package work.
Luckily it is also only called from package work.
Change-Id: I5e6662cfe667bdc9190f086be733105ad65a3191
Reviewed-on: https://go-review.googlesource.com/70670
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Where GCC says "unrecognized command line option", clang says "unknown
argument". This distinction usually doesn't matter because the
compiler will also exit with a non-zero status, but clang 3.4
reportedly exits with a zero status after reporting an unknown argument.
Change-Id: Ieb69ea352a8de0cd4171a1c26708dfe523421cfa
Reviewed-on: https://go-review.googlesource.com/72151
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
When traceviewer encounters a failure of json trace import
due to data error, onImportFail tried to access an error variable
which was not yet defined.
Change-Id: I431be03f179aafacaf1fd3c62a6337e8b5bd18fb
Reviewed-on: https://go-review.googlesource.com/71970
Reviewed-by: Austin Clements <austin@google.com>
The test already contained logic to do this however it did not match
the error "cannot find 'ld'" which appears to be how gcc fails when
ld.gold is missing.
Fixes#22340.
Change-Id: I841248cc489b8fa72bc00a95000ad405f9ef8a4f
Reviewed-on: https://go-review.googlesource.com/72111
Run-TryBot: Michael Munday <mike.munday@ibm.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
A 1XX, 204, or 304 response may not include a response body according
to RFC 7230, section 3.3.3. If a buggy server returns a 204 or 304
response with a body that is chunked encoded, the invalid body is
currently made readable in the Response. This can lead to data races due
to the transport connection's read loop which does not wait for the body
EOF when the response status is 204 or 304.
The correct behavior is to ignore the body on a 204 or 304 response, and
treat the body data as the beginning of the next request on the
connection.
Updates #22330.
Change-Id: I89a457ceb783b6f66136d5bf9be0a9b0a04fa955
Reviewed-on: https://go-review.googlesource.com/71910
Reviewed-by: Tom Bergan <tombergan@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Tom Bergan <tombergan@google.com>
racewalk's "foreach" function applies a function to all of a Node's
immediate children, but with a non-idiomatic signature.
This CL reworks it to recursively iterate over the entire subtree
rooted at Node and provides a way to short-circuit iteration.
Passes toolstash -cmp for std cmd with -race.
Change-Id: I738b73953d608709802c97945b7e0f4e4940d3f4
Reviewed-on: https://go-review.googlesource.com/71911
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
On modern Unix systems it is basically impossible for a multithreaded
program to open a binary for write, close it, and then fork+exec that
same binary. So don't write the binary if we're going to fork+exec it.
This fixes the ETXTBSY flakes.
Fixes#22220.
See also #22315.
Change-Id: I6be4802fa174726ef2a93d5b2f09f708da897cdb
Reviewed-on: https://go-review.googlesource.com/71570
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
golang.org/cl/37258 was committed to fix issue #16146.
This patch seemed intent to allow at most one dangling byte. But, as
implemented, many more bytes may actually slip through. This is because
the LZW layer creates a bufio.Reader which will itself consume data
beyond the end of the LZW stream, and this isn't accounted for anywhere.
This change means to avoid the allocation of the bufio.Reader by making
blockReader implement io.ByteReader. Further, it adds a close() method
which detects extra data in the block sequence. To avoid any
regressions with poorly encoded GIFs which may have worked accidentally,
there are no restrictions on how many extra bytes may exist in the final
full sub-block that contained LZW data. If the end of the LZW stream
happened to align with the end of a sub-block, at most one more
sub-block with a length of 1 byte may exist before the block terminator.
This change aims to be at least as performant as the prior
implementation. But the primary gain is avoiding the allocation of a
bufio.Reader per frame:
name old time/op new time/op delta
Decode-8 276µs ± 0% 275µs ± 2% ~ (p=0.690 n=5+5)
name old speed new speed delta
Decode-8 55.9MB/s ± 0% 56.3MB/s ± 2% ~ (p=0.690 n=5+5)
name old alloc/op new alloc/op delta
Decode-8 49.2kB ± 0% 44.8kB ± 0% -9.10% (p=0.008 n=5+5)
name old allocs/op new allocs/op delta
Decode-8 269 ± 0% 267 ± 0% -0.74% (p=0.008 n=5+5)
Change-Id: Iec4f9b895561ad52266313fbc73ec82c070c3349
Reviewed-on: https://go-review.googlesource.com/68350
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
When building test binaries, we build one archive with all of the test
sources and a second archive with the generated test package main and
link them together. If the test sources are themselves in package main
and the test was compiled with non-default compiler flags, then both
archives will contain a go.cuinfo.producer.main symbol, leading to a
duplicate symbol failure.
This has been causing test build failures on darwin-arm-a1428ios,
darwin-arm64-a1549ios, linux-amd64-noopt, android-arm-wiko-fever, and
android-arm64-wiko-fever since CL 71430 added this symbol. This CL
should fix the build.
Change-Id: I69051c846e7c0d97395a865a361cae07f411f9ad
Reviewed-on: https://go-review.googlesource.com/71771
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
CL 70310 dropped TODO while moving code.
Add TODO back, so we do not forget.
Change-Id: I3599ac02743bd35fb9556fdc238e9c72cf7f718f
Reviewed-on: https://go-review.googlesource.com/71590
Reviewed-by: David Crawshaw <crawshaw@golang.org>
No test because at present it is never called in a way that fails.
When #22114 is implemented, failure will be possible. Not including this
change in that work because this change is separable and clearly correct.
Updates #22114
Change-Id: I81eb9eec8800e8082d918c0e5fb71282f538267e
Reviewed-on: https://go-review.googlesource.com/71751
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Joe Tsai <joetsai@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
StructField.ByteSize is almost always unset; document that Type.Size()
is the place to look.
The dwarf package doesn't spend much effort teaching you DWARF, so I
don't know what level of handholding is appropriate. Still, no harm in a
little comment.
Closes#21093
Change-Id: I0ed8cad2fa18e10a47d264ff16c176d603d6033c
Reviewed-on: https://go-review.googlesource.com/71671
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This adds a whitelisted subset of compiler flags to the DW_AT_producer
DWARF attribute of each package compilation unit DIE. This is common
practice in DWARF and can help debuggers determine the quality of the
produced debugging information.
Fixes#22168.
Change-Id: I1b994ef2262aa9b88b68eb6e883695d1103acc58
Reviewed-on: https://go-review.googlesource.com/71430
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently mmap returns an unsafe.Pointer that encodes OS errors as
values less than 4096. In practice this is okay, but it borders on
being really unsafe: for example, the value has to be checked
immediately after return and if stack copying were ever to observe
such a value, it would panic. It's also not remotely idiomatic.
Fix this by making mmap return a separate pointer value and error,
like a normal Go function.
Updates #22218.
Change-Id: Iefd965095ffc82cc91118872753a5d39d785c3a6
Reviewed-on: https://go-review.googlesource.com/71270
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Set DW_AT_variable_parameter on DW_TAG_formal_parameters that are
actually return values. variable_parameter is supposed to indicate inout
parameters, but Go doesn't really have those, and DWARF doesn't have
explicit support for multiple return values. This seems to be the best
compromise, especially since the implementation of the two is very
similar -- both are stack slots.
Fixes#21100
Change-Id: Icebabc92b7b397e0aa00a7237478cce84ad1a670
Reviewed-on: https://go-review.googlesource.com/71670
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Updates http2 to x/net/http2 git rev 1087133bc4a for:
http2: reject DATA frame before HEADERS frame
https://golang.org/cl/56770
http2: respect peer's SETTINGS_MAX_HEADER_LIST_SIZE in ClientConn
https://golang.org/cl/29243
http2: reset client stream after processing response headers
https://golang.org/cl/70510
Also updated TestRequestLimit_h2 as the behavior changed slightly due
to https://golang.org/cl/29243.
Fixes#13959Fixes#20521Fixes#21466
Change-Id: Iac659694f3a48b8bd485546a4f96a932e3056026
Reviewed-on: https://go-review.googlesource.com/71611
Run-TryBot: Tom Bergan <tombergan@google.com>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Fixes Darwin 386 build. It turns out that the Darwin pthread_create
function saves the SSE registers, and therefore requires an aligned stack.
This worked before https://golang.org/cl/70530 because the stack sizes
were chosen to leave the stack aligned.
Change-Id: I911a9e8dcde4e41e595d5ef9b9a1ca733e154de6
Reviewed-on: https://go-review.googlesource.com/71432
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
More generally I'm concerned about these tests using
$GOROOT/src/cmd/go as scratch space, especially
combined wtih tg.parallel() - it's easy to believe some other
test might inadvertently also try to write x.exe about the
same time. This CL only solves the "didn't clean up x.exe"
problem and leaves for another day the "probably shouldn't
write to cmd/go at all" problem.
Fixes#22266.
Change-Id: I651534d70e2d360138e0373fb4a316081872550b
Reviewed-on: https://go-review.googlesource.com/71410
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This reverts commit 897080d5cb.
Reason for revert: Fails to fix all the locking issues.
Updates #21117
Change-Id: I6fc9cb7897244d6e1af78c089a2bf383258ec049
Reviewed-on: https://go-review.googlesource.com/71450
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Fixed an error that occurred in atomic mode. cover adds a global
variable declaration that forces sync/atomic to be used. fixDirectives
was confused by this declaration since it has an invalid
position. These declarations are now skipped.
Fixes#22309
Change-Id: I84f5fec13ef847fca35ad49f7704fb93b60503e0
Reviewed-on: https://go-review.googlesource.com/71351
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Simplifies the switch statement in the isZeroValue function by merging
the case branches.
Change-Id: I5b27939b62808dadac0cef632567b17e0e2b9a1d
Reviewed-on: https://go-review.googlesource.com/71390
Run-TryBot: Gabriel Aszalos <gabriel.aszalos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When an opening "{" of a block is missing and after advancing we
find a closing "}", it's likely better to assume the end of the
block. Fixed and removed TODO.
Change-Id: I20c9b4ecca798933a7cd4cbf21185bd4ca04f5f7
Reviewed-on: https://go-review.googlesource.com/71291
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Current suffix check is based on instruction, which is not very
accurate. For example, "MOVW.S R1, R2" is valid, but
"MOVW.S $0xaaaaaaaa, R1" and "MOVW.P CPSR, R9" are not.
This patch fixes the above kinds of issues by checking suffix
based on []optab. And also more test cases are added.
fixes#20509
Change-Id: Ibad91be72c78eefa719412a83b4d44370d2202a8
Reviewed-on: https://go-review.googlesource.com/70910
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
CL 46037 and CL 46038 implemented termination of
locked OS threads when the goroutine exits.
However, this behavior leads to crashes of Go programs
using runtime.LockOSThread on Plan 9. This is notably
the case of the os/exec and net packages.
This change disables termination of locked OS threads
on Plan 9.
Updates #22227.
Change-Id: If9fa241bff1c0b68e7e9e321e06e5203b3923212
Reviewed-on: https://go-review.googlesource.com/71230
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
CL 46033 added a "template thread" mechanism to
allow creation of thread with a known-good state
from a thread of unknown state.
However, we are experiencing issues on Plan 9
with programs using the os/exec and net package.
These package are relying on runtime.LockOSThread.
Updates #22227.
Change-Id: I85b71580a41df9fe8b24bd8623c064b6773288b0
Reviewed-on: https://go-review.googlesource.com/70231
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Unify the 386 entry point code as much as possible.
The main function could not be unified because on Windows 386 it is
called _main. Putting main in asm_386.s caused multiple definition
errors when using the external linker.
Add the _lib entry point to various operating systems. A future CL
will enable c-archive/c-shared mode for those targets.
Fix _rt0_386_windows_lib_go--it was passing arguments as though it
were amd64.
Change-Id: Ic73f1c95cdbcbea87f633f4a29bbc218a5db4f58
Reviewed-on: https://go-review.googlesource.com/70530
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Also fix 64-bit DWARF to read a 64-bit abbrev offset in the
compilation unit.
Change-Id: Idc22e59ffb354d58e9973b62fdbd342acf695859
Reviewed-on: https://go-review.googlesource.com/71171
Reviewed-by: Austin Clements <austin@google.com>
- checking for the correct closing token leads to slightly better
behavior for some randomly bogus programs
- removed `switch` in favor of an `if` statement
Follow-up on https://go-review.googlesource.com/c/go/+/71250.
Change-Id: I47f6c47b43baf790907f55ed97a947661687a9db
Reviewed-on: https://go-review.googlesource.com/71252
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Adds the two range control actions "break" and "continue". They act the
same as the Go keywords break and continue, but are simplified in that
only the innermost range statement can be broken out of or continued.
Fixes#20531
Change-Id: I4412b3bbfd4dadb0ab74ae718e308c1ac7a0a1e9
Reviewed-on: https://go-review.googlesource.com/66410
Reviewed-by: Rob Pike <r@golang.org>
Fine-tune skipping of tokens after missing closing parentheses in lists.
Fixes#22164.
Change-Id: I575d86e21048cd40340a2c08399e8b0deec337cf
Reviewed-on: https://go-review.googlesource.com/71250
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Previously, cover printed directives (//go: comments) near the top of
the file unless they were in doc comments. However, directives
frequently apply to specific definitions, and they are not written in
doc comments to prevent godoc from printing them. Moving all
directives to the top of the file affected semantics of tests.
With this change, directives are kept together with the following
top-level declarations. Only directives that occur after all top-level
declarations are moved.
Fixes#22022
Change-Id: Ic5c61c4d3969996e4ed5abccba0989163789254c
Reviewed-on: https://go-review.googlesource.com/69630
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
Use TEXT pseudo-instruction to adjust SP instead of a SUB instruction
so that the assembler knows how to fill in the pcsp table and the frame
description entry correctly.
Updates #21569
Change-Id: I436c840b2af99bbb3042ecd38a7d7c1ab4d7372a
Reviewed-on: https://go-review.googlesource.com/70937
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The code was commented out by https://golang.org/cl/13234050 in 2013.
Let's just remove it.
Change-Id: I46ae1f07386719e991458e782d236214c40bdce1
Reviewed-on: https://go-review.googlesource.com/70770
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Use them to replace if/else chains with at least three comparisons,
where the code becomes clearly simpler.
Passes toolstash -cmp on std cmd.
Change-Id: Ic98aa3905944ddcab5aef5f9d9ba376853263d94
Reviewed-on: https://go-review.googlesource.com/70934
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The write barrier insertion has moved to the SSA backend's
writebarrier pass. There is still needwritebarrier function
left in the frontend. This function is used in two places:
- fncall, which is called in ascompatet, which is called in
walking OAS2FUNC. For OAS2FUNC, in order pass we've already
created temporaries, and there is no write barrier for the
assignments of these temporaries.
- updateHasCall, which updates the HasCall flag of a node. the
HasCall flag is then used in
- fncall, mentioned above.
- ascompatet. As mentioned above, this is an assignment to
a temporary, no write barrier.
- reorder1, which is always called with a list produced by
ascompatte, which is a list of assignments to stack, which
have no write barrier.
- vmatch1, which is called in oaslit with r.Op as OSTRUCTLIT,
OARRAYLIT, OSLICELIT, or OMAPLIT. There is no write barrier
in those literals.
Therefore, the needwritebarrier function is unnecessary. This
CL removes it.
Passes "toolstash -cmp" on std cmd.
Updates #17583.
Change-Id: I4b87ba8363d6583e4282a9e607a9ec8ce3ab124a
Reviewed-on: https://go-review.googlesource.com/43640
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
On ARM, STREX does not permit the same register used as both the
source and the destination. Reject the bad instruction.
The assembler also accepted special cases
STREX R0, (R1) as STREX R0, (R1), R0
STREX (R1), R0 as STREX R0, (R1), R0
both are illegal. Remove this special case as well.
For STREXD, check that the destination is not source, and not
source+1. Also check that the source register is even numbered,
as required by the architecture's manual.
Fixes#22268.
Change-Id: I6bfde86ae692d8f1d35bd0bd7aac0f8a11ce8e22
Reviewed-on: https://go-review.googlesource.com/71190
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In golang.org/cl/61130, I removed the need for setting Xoffset on
OXCASE Nodes, but missed this assignment.
Passes toolstash-check.
Change-Id: I90ab05add14981b89ee18e73e1cdf2f13e9f9934
Reviewed-on: https://go-review.googlesource.com/66934
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
If the client sends a request with a custom Host header and receives
a relative redirect in response, the second request should use the
same Host header as the first request. However, if the response is
an abolute redirect, the Host header should not be preserved. See
further discussion on the issue tracker.
Fixes#22233
Change-Id: I8796e2fbc1c89b3445e651f739d5d0c82e727c14
Reviewed-on: https://go-review.googlesource.com/70792
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Instead of repeating the same list parsing pattern for parenthesized
of braced comma or semicolon-separated lists, introduce a single list
parsing function that can be parametrized and which takes a closure
to parse list elements.
This ensures the same error handling and recovery logic is used across
all lists and simplifies the code.
No semantic change.
Change-Id: Ia738d354d6c2e0c3d84a5f1c7269a6eb95685edc
Reviewed-on: https://go-review.googlesource.com/70492
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
No semantic change. Move functionality not related to argument
out of the argument parsing function, and thus match parameter
parsing. Also, use a better function name.
Change-Id: Ic550875251d64e6fe1ebf91c11d33a9e4aec9fdd
Reviewed-on: https://go-review.googlesource.com/70491
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
STREX does not permit using the same register for the value to store
and the place where the result is returned. Also the code was wrong
anyhow if the first store failed.
Fixes#22248
Change-Id: I96013497410058514ffcb771c76c86faa1ec559b
Reviewed-on: https://go-review.googlesource.com/70911
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Change-Id: I50389752dcbf5d058ce11256a414be7955cdb77f
Reviewed-on: https://go-review.googlesource.com/71070
Run-TryBot: Tom Bergan <tombergan@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
Check to ensure that Status is set
when parsing a proxied HTTPS response
that a CONNECT proxy-authorization.
Fixes#21701
Change-Id: Id91700b83425420101e0b0d46e12aaf5d20fd3a3
Reviewed-on: https://go-review.googlesource.com/59990
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Tom Bergan <tombergan@google.com>
This is much easier than replacing SSUB so split it out from my other CL.
Change-Id: If01e4005da5355895404456320a2156bde4ec09a
Reviewed-on: https://go-review.googlesource.com/71050
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This is https://go-review.googlesource.com/42025 but with some more fixes --
hidden symbols implicitly passed "Type == 0 || Type == SXREF" checks. (This
sort of thing is part of why I wanted to make this change)
Change-Id: I2273ee98570fd7f2dd8a799c692a2083c014235e
Reviewed-on: https://go-review.googlesource.com/42330
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reduce the scope of some. Also remove vars that were simply the index or
the value in a range statement. While at it, remove a var that was
exactly the length of a slice.
Also replaced 'bad' with a more clear 'errored' of type bool, and
renamed a single-char name with a comment to a name that is
self-explanatory.
And removed a few unnecessary Index calls within loops.
Passes toolstash -cmp on std cmd.
Change-Id: I26eee5f04e8f7e5418e43e25dca34f89cca5c80a
Reviewed-on: https://go-review.googlesource.com/70930
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The complainant is confused by the ambiguity of 'next' in the
phrase 'next operand'. It seems clear enough to me that things
are always read left to right when formatting, but to calm the
waters we add a clarifying parenthetical.
Fixes#22275
Change-Id: I82418c1e987db736f4bee0faa53fe715c9cde8f5
Reviewed-on: https://go-review.googlesource.com/71010
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
ANSI X9.62 specifies that Unmarshal should fail if the a given coordinate is
not smaller than the prime of the elliptic curve. This change makes Unmarshal
ANSI X9.62 compliant and explicitly documents that the Marshal/Unmarshal only
supports uncompressed points.
Fixes#20482
Change-Id: I161a73da8279cae505c9ba0b3022021709fe8145
Reviewed-on: https://go-review.googlesource.com/44312
Reviewed-by: Adam Langley <agl@golang.org>
Reviewed-by: Filippo Valsorda <hi@filippo.io>
Run-TryBot: Adam Langley <agl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The indexed bitmap of a frame is encoded into a GIF by first LZW
compression, and then packaged by a simple block mechanism. Each block
of up-to-256 bytes starts with one byte, which indicates the size of the
block (0x01-0xff). The sequence of blocks is terminated by a 0x00.
While the format supports it, there is no good reason why any particular
image should be anything but a sequence of 255-byte blocks with one last
block less than 255-bytes.
The old blockWriter implementation would not buffer between Write()s,
meaning if the lzw Writer needs to flush more than one chunk of data via
a Write, multiple short blocks might exist in the middle of a stream.
Separate but related, the old implementation also forces lzw.NewWriter
to allocate a bufio.Writer because the blockWriter is not an
io.ByteWriter itself. But, even though it doesn't effectively buffer
data between Writes, it does make extra copies of sub-blocks during the
course of writing them to the GIF's writer.
Now, the blockWriter shall continue to use the encoder's [256]byte buf,
but use it to effectively buffer a series of WriteByte calls from the
lzw Writer. Once a WriteByte fills the buffer, the staged block is
Write()n to the underlying GIF writer. After the lzw Writer is Closed,
the blockWriter should also be closed, which will flush any remaining
block along with the block terminator.
BenchmarkEncode indicates slight improvements:
name old time/op new time/op delta
Encode-8 7.71ms ± 0% 7.38ms ± 0% -4.27% (p=0.008 n=5+5)
name old speed new speed delta
Encode-8 159MB/s ± 0% 167MB/s ± 0% +4.46% (p=0.008 n=5+5)
name old alloc/op new alloc/op delta
Encode-8 84.1kB ± 0% 80.0kB ± 0% -4.94% (p=0.008 n=5+5)
name old allocs/op new allocs/op delta
Encode-8 9.00 ± 0% 7.00 ± 0% -22.22% (p=0.008 n=5+5)
Change-Id: I9eb9367d41d7c3d4d7f0adc9b720fc24fb50006a
Reviewed-on: https://go-review.googlesource.com/68351
Reviewed-by: Nigel Tao <nigeltao@golang.org>
After we detect errors, the AST is in a precarious state and more
likely to trip useless ICE failures. Instead let the user fix any
existing errors and see if the ICE persists. This makes Fatalf more
consistent with how panics are handled by hidePanic.
While here, also fix detection for release versions: release version
strings begin with "go" ("go1.8", "go1.9.1", etc), not "release".
Fixes#22252.
Change-Id: I1c400af62fb49dd979b96e1bf0fb295a81c8b336
Reviewed-on: https://go-review.googlesource.com/70850
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
The caller's PC is always available in the frame. We can just
load it when needed, no need to spill.
Change-Id: I9c0a525903e574bb4eec9fe53cbeb8c64321166a
Reviewed-on: https://go-review.googlesource.com/70710
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Consolidate the signature and hash fields (SignatureAndHashAlgorithm in
TLS 1.2) into a single uint16 (SignatureScheme in TLS 1.3 draft 21).
This makes it easier to add RSASSA-PSS for TLS 1.2 in the future.
Fields were named like "signatureAlgorithm" rather than
"signatureScheme" since that name is also used throughout the 1.3 draft.
The only new public symbol is ECDSAWithSHA1, other than that this is an
internal change with no new functionality.
Change-Id: Iba63d262ab1af895420583ac9e302d9705a7e0f0
Reviewed-on: https://go-review.googlesource.com/62210
Reviewed-by: Adam Langley <agl@golang.org>
Currently only a single P can run a fractional mark worker at a time.
This doesn't let us spread out the load, so it gets concentrated on
whatever unlucky P picks up the token to run a fractional worker. This
can significantly delay goroutines on that P.
This commit changes this scheduling rule so each P separately
schedules fractional workers. This can significantly reduce the load
on any individual P and allows workers to self-preempt earlier. It
does have the downside that it's possible for all Ps to be in
fractional workers simultaneously (an effect STW).
Updates #21698.
Change-Id: Ia1e300c422043fa62bb4e3dd23c6232d81e4419c
Reviewed-on: https://go-review.googlesource.com/68574
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Currently fractional workers run until preempted by the scheduler,
which means they typically run for 20ms. During this time, all other
goroutines on that P are blocked, which can introduce significant
latency variance.
This modifies fractional workers to self-preempt shortly after
achieving the fractional utilization goal. In practice this means they
preempt much sooner, and the scale of their preemption is on the order
of how often the user goroutine block (so, if the application is
compute-bound, the fractional workers will also run for long times,
but if the application blocks frequently, the fractional workers will
also preempt quickly).
Fixes#21698.
Updates #18534.
Change-Id: I03a5ab195dae93154a46c32083c4bb52415d2017
Reviewed-on: https://go-review.googlesource.com/68573
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
We haven't used non-zero gcForcePreemptNS for ages. Remove it and
declutter the code.
Change-Id: Id5cc62f526d21ca394d2b6ca17d34a72959535da
Reviewed-on: https://go-review.googlesource.com/68572
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
When GOMAXPROCS is not small, fractional workers don't add much to
throughput, but they do add to the latency of individual goroutines.
In this case, it makes sense to just use dedicated workers, even if we
can't exactly hit the 25% CPU goal with dedicated workers.
This implements this logic by computing the number of dedicated mark
workers that will us closest to the 25% target. We only fall back to
fractional workers if that would be more than 30% off of the target
(less than 17.5% or more than 32.5%, which in practice happens for
GOMAXPROCS <= 3 and GOMAXPROCS == 6).
Updates #21698.
Change-Id: I484063adeeaa1190200e4ef210193a20e635d552
Reviewed-on: https://go-review.googlesource.com/68571
Reviewed-by: Rick Hudson <rlh@golang.org>
Currently these are the same constant, but are separate concepts.
Split them into two constants for easier experimentation and better
documentation.
Change-Id: I121854d4fd1a4a827f727c8e5153160c24aacda7
Reviewed-on: https://go-review.googlesource.com/68570
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
https://golang.org/cl/67270 wasn't `go fmt`ed correctly, according to
the current `go fmt`. However, what `go fmt` did looked odd, so this
change tweaks the test to use a more standard layout.
Whitespace-only; no semantic change.
Change-Id: Id820352e7c9e68189ee485c8a9bfece75ca4f9cb
Reviewed-on: https://go-review.googlesource.com/69031
Run-TryBot: Adam Langley <agl@golang.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@golang.org>
Database drivers should be called from a single goroutine to ease
driver's design. If a driver chooses to handle context
cancels internally it may do so.
The sql package violated this agreement when calling Next or
NextResultSet. It was possible for a concurrent rollback
triggered from a context cancel to call a Tx.Rollback (which
takes a driver connection lock) while a Rows.Next is in progress
(which does not tack the driver connection lock).
The current internal design of the sql package is each call takes
roughly two locks: a closemu lock which prevents an disposing of
internal resources (assigning nil or removing from lists)
and a driver connection lock that prevents calling driver code from
multiple goroutines.
Fixes#21117
Change-Id: Ie340dc752a503089c27f57ffd43e191534829360
Reviewed-on: https://go-review.googlesource.com/65731
Reviewed-by: Ian Lance Taylor <iant@golang.org>
CL 69370 introduced a hasmain field to moduledata after the
modulehashes slice. However that code was relying on the zeroing
code after it to cover modulehashes if len(Shlibs) == 0. The
hasmain field gets in the way of that. So clear modulehashes
explicitly in that case.
Found when looking at #22250. Not sure if it's related.
Change-Id: I81050cb4554cd49e9f245d261ef422f97d026df4
Reviewed-on: https://go-review.googlesource.com/70730
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In https://golang.org/cl/66334, the test was changed so that the second
Listen would also be closed. However, it shouldn't have reused the same
ln variable, as that can lead to a data race with the background loop
that accepts connections.
Simply define a new Listener, since we don't need to overwrite the first
variable.
I was able to reproduce the data race report locally about 10% of the
time by reducing the sleep from a millisecond to a nanosecond. After the
fix, it's entirely gone after 1000 runs.
Fixes#22226.
Change-Id: I7c639f9f2ee5098eac951a45f42f97758654eacd
Reviewed-on: https://go-review.googlesource.com/70230
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This change adds support for accelerating time.Now by using
the __vdso_clock_gettime fast-path via the vDSO on linux/386
if it is available.
When the vDSO path to the clocks is available, it is typically
5x-10x faster than the syscall path (see benchmark extract
below). Two such calls are made for each time.Now() call
on most platforms as of go 1.9.
- Add vdso_linux_386.go, containing the ELF32 definitions
for use by vdso_linux.go, the maximum array size, and
the symbols to be located in the vDSO.
- Modify runtime.walltime and runtime.nanotime to check for
and use the vDSO fast-path if available, or fall back to
the existing syscall path.
- Reduce the stack reservations for runtime.walltime and
runtime.monotime from 32 to 16 bytes. It appears the syscall
path actually only needed 8 bytes, but 16 is now needed to
cover the syscall and vDSO paths.
- Remove clearing DX from the syscall paths as clock_gettime
only takes 2 args (BX, CX in syscall calling convention),
so there should be no need to clear DX.
The included BenchmarkTimeNow was run with -cpu=1 -count=20
on an "Intel(R) Celeron(R) CPU J1900 @ 1.99GHz", comparing
released go 1.9.1 vs this change. This shows a gain in
performance on linux/386 (6.89x), and that no regression
occurred on linux/amd64 due to this change.
Kernel: linux/i686, GOOS=linux GOARCH=386
name old time/op new time/op delta
TimeNow 978ns ± 0% 142ns ± 0% -85.48% (p=0.000 n=16+20)
Kernel: linux/x86_64, GOOS=linux GOARCH=amd64
name old time/op new time/op delta
TimeNow 125ns ± 0% 125ns ± 0% ~ (all equal)
Gains are more dramatic in virtualized environments,
presumably due to the overhead of virtualizing the syscall.
Fixes#22190
Change-Id: I2f83ce60cb1b8b310c9ced0706bb463c1b3aedf8
Reviewed-on: https://go-review.googlesource.com/69390
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
syscall.Select uses SYS_PSELECT6 on arm64 and mipx64x, however this
syscall expects its 5th argument to be of type Timespec (with seconds
and nanoseconds) instead of type Timeval (with seconds and microseconds)
This leads to the timeout being too short by a factor of 1000.
This CL fixes this by adjusting the timeout argument accordingly,
similarly to how glibc does it for architectures where neither
SYS_SELECT nor SYS__NEWSELECT are available.
Fixes#22246
Change-Id: I33a183b0b87c2dae4a77a2d00f8615169fad48dd
Reviewed-on: https://go-review.googlesource.com/70590
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Some ARM64-specific instructions (such as SIMD instructions) are not supported.
This patch adds support for the following:
1. Extended register, e.g.:
ADD Rm.<ext>[<<amount], Rn, Rd
<ext> can have the following values:
UXTB, UXTH, UXTW, UXTX, SXTB, SXTH, SXTW and SXTX
2. Arrangement for SIMD instructions, e.g.:
VADDP Vm.<T>, Vn.<T>, Vd.<T>
<T> can have the following values:
B8, B16, H4, H8, S2, S4 and D2
3. Width specifier and element index for SIMD instructions, e.g.:
VMOV Vn.<T>[index], Rd // MOV(to general register)
<T> can have the following values:
S and D
4. Register List, e.g.:
VLD1 (Rn), [Vt1.<T>, Vt2.<T>, Vt3.<T>]
5. Register offset variant, e.g.:
VLD1.P (Rn)(Rm), [Vt1.<T>, Vt2.<T>] // Rm is the post-index register
6. Go assembly for ARM64 reference manual
new added instructions are required to have according explanation items in
the manual and items for existed instructions will be added incrementally
For more information about the refinement background, please refer to the
discussion (https://groups.google.com/forum/#!topic/golang-dev/rWgDxCrL4GU)
This patch only adds syntax and doesn't break any assembly that already exists.
Change-Id: I34e90b7faae032820593a0e417022c354a882008
Reviewed-on: https://go-review.googlesource.com/41654
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The GIF format allows for an image to contain a global color table which
might be used for some or every frame in an animated GIF. This palette
contains 24-bit opaque RGB values. An individual frame may use the
global palette and enable transparency by picking one number to be
transparent, instead of the color value in the palette.
image/gif decodes a GIF, which contains an []*image.Paletted that holds
each frame. When decoded, if a frame has a transparent color and uses
the global palette, a copy of the global []color.Color is made, and the
transparency color index is replaced with color.RGBA{}.
When encoding a GIF, each frame's palette is encoded to the form it
might exist in a GIF, up to 768 bytes "RGBRGBRGBRGB...". If a frame's
encoded palette is equal to the encoded global color table, the frame
will be encoded with the flag set to use the global color table,
otherwise the frame's palette will be included.
So, if the color in the global color table that matches the transparent
index of one frame wasn't black (and it frequently is not), reencoding a
GIF will likely result in a larger file because each frame's palette
will have to be encoded inline.
This commit takes a frame's transparent color index into account when
comparing an individual image.Paletted's encoded color table to the
global color table.
Fixes#22137
Change-Id: I5460021da6e4d7ce19198d5f94a8ce714815bc08
Reviewed-on: https://go-review.googlesource.com/68313
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Excluded when -short because it still runs relatively long,
but deflaked.
Removed timeouts from normal path and ensured that they were
not needed and that reference files did not change.
Use "tbreak" instead of "break" with gdb to reduce chance
of multiple hits on main.main. (Seems not enough, but a
move in the right direction).
By default, testing ignores repeated lines that occur when
nexting. This appears to sometimes be timing-dependent and
is the observed source of flakiness in testing so far.
Note that these can also be signs of a bug in the generated
debugging output, but it is one of the less-confusing bugs
that can occur.
By default, testing with gdb uses compilation with
inlining disabled to prevent dependence on library code
(it's a bug that library code is seen while Nexting, but
the bug is current behavior).
Also by default exclude all source files outside /testdata
to prevent accidental dependence on library code. Note that
this is currently only applicable to dlv because (for the
debugging information we produce) gdb does not indicate a
change in the source file for inlined code.
Added flags -i and -r to make gdb testing compile with
inlining and be sensitive to repeats in the next stream.
This is for developer-testing and so we can describe these
problems in bug reports.
Updates #22206.
Change-Id: I9a30ebbc65aa0153fe77b1858cf19743bdc985e4
Reviewed-on: https://go-review.googlesource.com/69930
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This somewhat mirrors the special case behavior of the copy built-in.
Fixes#22215
Change-Id: Ic353003ad3de659d3a6b4e9d97295b42510f3bf7
Reviewed-on: https://go-review.googlesource.com/70431
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This is a preparation step for adding vDSO support on linux/386.
This change relocates the elf64 and amd64 specifics from
vdso_linux.go to a new vdso_linux_amd64.go.
This should enable vdso_linux.go to be used for vDSO
support on linux architectures other than amd64.
- Relocate the elf64X structure definitions appropriate to amd64,
and change their names to elfX so that the code in vdso_linux.go
is ELFnn-agnostic.
- Relocate the sym_keys and corresponding __vdso_* variables
appropriate to amd64.
- Provide an amd64-specific constant for the maximum byte size of
an array, and use this in vdso_linux.go to compute constants for
sizing the elf structure arrays traversed in the loaded vDSO.
Change-Id: I1edb4e4ec9f2d79b7533aa95fbd09f771fa4edef
Reviewed-on: https://go-review.googlesource.com/69391
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently we look to see if the main.main symbol address is in the
module data text range. This requires access to the main.main
symbol, which usually the runtime has, but does not when building
a plugin.
To avoid a dynamic relocation to main.main (which I haven't worked
out how to have the linker generate on darwin), stop using the
symbol. Instead record a boolean in the moduledata if the module
has the main function.
Fixes#22175
Change-Id: If313a118f17ab499d0a760bbc2519771ed654530
Reviewed-on: https://go-review.googlesource.com/69370
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
For #22095
Change-Id: I8f48fce571b69a7e8edf2ad7733ffdfd38676e63
Reviewed-on: https://go-review.googlesource.com/70310
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
These functions are identical to math/bits.TrailingZeros{32,64}, which
are already intrinsified on ppc64.
Change-Id: If7ee57e7afe53154874f4b66bacdb6237806128a
Reviewed-on: https://go-review.googlesource.com/70350
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
When we split separate packages into separate compilation units, we
lost PC range information because it was no longer contiguous. This
brings it back by constructing proper per-package PC range tables.
Change-Id: Id0ab5187e08ac5d13b3d3794977bfc857a56224f
Reviewed-on: https://go-review.googlesource.com/69974
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Currently, the linker generates one huge DWARF compilation unit for
the entire Go binary. This commit creates a separate compilation unit
and line table per Go package.
We temporarily lose compilation unit PC range information, since it's
now discontiguous, so harder to emit. We'll bring it back in the next
commit.
Beyond being "more traditional", this has various technical
advantages:
* It should speed up line table lookup, since that requires a
sequential scan of the line table. With this change, a debugger can
first locate the per-package line table and then scan only that line
table.
* Once we emit compilation unit PC ranges again, this should also
speed up various other debugger reverse PC lookups.
* It puts us in a good position to move more DWARF generation into the
compiler, which could produce at least the CU header, per-function
line table fragments, and per-function frame unwinding info that the
linker could simply paste together.
* It will let us record a per-package compiler command-line flags
(#22168).
Change-Id: Ibac642890984636b3ef1d4b37fe97f4453c2cc84
Reviewed-on: https://go-review.googlesource.com/69973
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The DWARF code currently clears all section relocations every time it
creates a section. This is unnecessary and confusing, so don't do it.
This dates back to
https://codereview.appspot.com/7891044/diff/26001/src/cmd/ld/dwarf.c.
At the time, this was only done for one symbol and that symbol was
used solely for collecting relocations (which is why it made sense to
clear the relocations but not the actual data). Furthermore, DWARF
generation potentially required two passes, so it was important to
clear the state from the first pass. None of this is true now, but
this pattern had been cargo-culted all over the dwarf.go.
Change-Id: I87d4ff8ccd5c807796241559be46168ce3ccb49a
Reviewed-on: https://go-review.googlesource.com/70312
Run-TryBot: Austin Clements <austin@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The .debug_aranges section is an odd vestige of DWARF, since its
contents are easy and efficient for a debugger to reconstruct from the
attributes of the top-level compilation unit DIEs. Neither GCC nor
clang emit it by default these days. GDB and Delve ignore it entirely.
LLDB will use it if present, but is happy to construct the index from
the compilation unit attributes (and, indeed, a remarkable variety of
other ways if those aren't available either).
We're about to split up the compilation units by package, which means
they'll have discontiguous PC ranges, which is going to make
.debug_aranges harder to construct (and larger).
Rather than try to maintain this essentially unused code, let's
simplify things and remove it.
Change-Id: I8e0ccc033b583b5b8908cbb2c879b2f2d5f9a50b
Reviewed-on: https://go-review.googlesource.com/69972
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
During Mach-O linking, dsymutil takes the DWARF from individual object
files and combines it into a debug archive. Because it's content-aware,
it doesn't need our help to do its job. Nonetheless, it does try to
honor relocations that are present in its input.
When dsymutil encounters a relocation, it uses the value of that
relocation as an index into the debug map to find its final location.
When it does that, it's assuming that the value is an address in the
object file. But DWARF references are section-relative. So when it
processes a relocation for a DWARF reference, it gets confused,
and if the value happens to match the address of a function or
data symbol, it will rewrite it incorrectly.
Since the relocations don't help, and can hurt, drop them when
externally linking a Mach-O binary.
Fixes#22068
Change-Id: I8ec36da626575d9f6c8d0e7a0b76eab8ba22d62c
Reviewed-on: https://go-review.googlesource.com/68330
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
The alternative signal stack doesn't work on ios, so the setup of
the alternative stack was skipped. The corresponding unminitSignals
was effectively a no-op on ios until CL 70130. Skip unminitSignals
on ios to restore the previous behaviour.
For the ios builders.
Change-Id: I5692ca7f5997e6b9d10cc5f2383a5a37c42b133c
Reviewed-on: https://go-review.googlesource.com/70270
Run-TryBot: Elias Naur <elias.naur@gmail.com>
Reviewed-by: Austin Clements <austin@google.com>
The two are not meaningfully different, and it is confusing to have two.
Change-Id: Ie6a355ea4d79fb4bb79bf5124071a866038b19ba
Reviewed-on: https://go-review.googlesource.com/70211
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
CL 36799 made SetFileCompletionNotificationModes to be called for
file handles. I don't think it is correct. Revert that change.
Fixes#22024Fixes#22207
Change-Id: I26260e8a727131cffbf60958d79eca2457495554
Reviewed-on: https://go-review.googlesource.com/69871
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Current code assumes that SetFileCompletionNotificationModes
is safe to call even if we know that it is not safe to use
FILE_SKIP_COMPLETION_PORT_ON_SUCCESS flag. It appears (see issue #22149),
SetFileCompletionNotificationModes crashes when we call it without
FILE_SKIP_COMPLETION_PORT_ON_SUCCESS flag.
Do not call SetFileCompletionNotificationModes in that situation.
We are allowed to do that, because SetFileCompletionNotificationModes
is just an optimisation.
Fixes#22149
Change-Id: I0ad3aff4eabd8c27739417a62c286b1819ae166a
Reviewed-on: https://go-review.googlesource.com/69870
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Decode decodes entire GIF image and returns the first frame as an
image.Image. There's no need for it to keep every decoded frame in
memory except for the one it returns.
Fixes#22199
Change-Id: I76b4bd31608ebc76a1a3df02e85c20eb80df7877
Reviewed-on: https://go-review.googlesource.com/69890
Reviewed-by: Nigel Tao <nigeltao@golang.org>
CL 69292 unified the amd64 entry-points, but Dragonfly doesn't follow
the same entry-point argument conventions as most other amd64
platforms. Fix the Dragonfly entry point.
Change-Id: I0f84e2e4101ce68217af185ee9baaf455b8b6dad
Reviewed-on: https://go-review.googlesource.com/70212
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Since CL 46037, the runtime is crashing after calling
exitThread on Plan 9.
The exitThread function shouldn't be called on
Plan 9, because the system manages thread stacks.
Fixes#22221.
Change-Id: I5d61c9660a87dc27e4cfcb3ca3ddcb4b752f2397
Reviewed-on: https://go-review.googlesource.com/70190
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Previously, we were treating cross-package function calls as free for
inlining budgeting.
In theory, we should be able to recompute InlCost from the
exported/reimported function bodies. However, that process mutates the
structure of the Node AST enough that it doesn't preserve InlCost. To
avoid unexpected issues, just record and restore InlCost in the export
data.
Fixes#19261.
Change-Id: Iac2bc0d32d4f948b64524aca657051f9fc96d92d
Reviewed-on: https://go-review.googlesource.com/70151
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Noticed while reading some code that the two branches in this loop body
shared the last statements. Rewrite it in a way that they are not
duplicated.
Passes toolstash -cmp on std.
Change-Id: I3356ca9fa37c32eee496e221d7830bfc581dade1
Reviewed-on: https://go-review.googlesource.com/66470
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Calls to a closure held in a local, non-escaping,
variable can be inlined, provided the closure body
can be inlined and the variable is never written to.
The current implementation has the following limitations:
- closures with captured variables are not inlined because
doing so naively triggers invariant violation in the SSA
phase
- re-assignment check is currently approximated by checking
the Addrtaken property of the variable which should be safe
but may miss optimization opportunities if the address is
not used for a write before the invocation
Updates #15561
Change-Id: I508cad5d28f027bd7e933b1f793c14dcfef8b5a1
Reviewed-on: https://go-review.googlesource.com/65071
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hugues Bruant <hugues.bruant@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Android's libc creates a signal stack for every thread it creates. In
Go, minitSignalStack picks up this existing signal stack and puts it
in m.gsignal.stack. However, if we later try to exit a thread (because
a locked goroutine is exiting), we'll attempt to stackfree this
libc-allocated signal stack and panic.
Fix this by clearing gsignal.stack when we unminitSignals in such a
situation.
This should fix the Android build, which is currently broken.
Change-Id: Ieea8d72ef063d22741c54c9daddd8bb84926a488
Reviewed-on: https://go-review.googlesource.com/70130
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In #10909, it was decided that "Deprecated:" is a magic string for
tools (e.g., #17056 for godoc) to detect deprecated identifiers.
Use those convention instead of custom written prose.
Change-Id: Ia514fc3c88fc502e86c6e3de361c435f4cb80b22
Reviewed-on: https://go-review.googlesource.com/70110
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
In order to improve the line numbering for debuggers,
it's necessary to trace lines through compilation.
This makes it (much) easier to follow.
The format of the last column of the ssa.html output was
also changed to reduce the spamminess of the file name,
which is usually the same and makes it far harder to read
instructions and line numbers, and to make it wider and also
able to break words when wrapping (long path names still
can push off the end otherwise; side-to-side scrolling was
tried but was more annoying than the occasional wrapped
line).
Sample output now, where [...] is elision for sake of making
the CL character-counter happy -- and the (##) line numbers
are rendered in italics and a smaller font (11 point) under
control of a CSS class "line-number".
genssa
# /Users/drchase/[...]/ssa/testdata/hist.go
00000 (35) TEXT "".main(SB)
00001 (35) FUNCDATA $0, gclocals·7be4bb[...]1e8b(SB)
00002 (35) FUNCDATA $1, gclocals·9ab98a[...]4568(SB)
v920 00003 (36) LEAQ ""..autotmp_31-640(SP), DI
v858 00004 (36) XORPS X0, X0
v6 00005 (36) LEAQ -48(DI), DI
v6 00006 (36) DUFFZERO $277
v576 00007 (36) LEAQ ""..autotmp_31-640(SP), AX
v10 00008 (36) TESTB AX, (AX)
b1 00009 (36) JMP 10
and from an earlier phase:
b18: ← b17
v242 (47) = Copy <mem> v238
v243 (47) = VarKill <mem> {.autotmp_16} v242
v244 (48) = Addr <**bufio.Scanner> {scanner} v2
v245 (48) = Load <*bufio.Scanner> v244 v243
[...]
v279 (49) = Store <mem> {int64} v277 v276 v278
v280 (49) = Addr <*error> {.autotmp_18} v2
v281 (49) = Load <error> v280 v279
v282 (49) = Addr <*error> {err} v2
v283 (49) = VarDef <mem> {err} v279
v284 (49) = Store <mem> {error} v282 v281 v283
v285 (47) = VarKill <mem> {.autotmp_18} v284
v286 (47) = VarKill <mem> {.autotmp_17} v285
v287 (50) = Addr <*error> {err} v2
v288 (50) = Load <error> v287 v286
v289 (50) = NeqInter <bool> v288 v51
If v289 → b21 b22 (line 50)
Change-Id: I3f46310918f965761f59e6f03ea53067237c28a8
Reviewed-on: https://go-review.googlesource.com/69591
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This adds the _lib entry point to various GOOS_amd64.s files.
A future CL will enable c-archive/c-shared mode for those targets.
As far as I can tell, the newosproc0 function in os_darwin.go was
passing the wrong arguments to bsdthread_create. The newosproc0
function is never called in the current testsuite.
Change-Id: Ie7c1c2e326cec87013e0fea84f751091b0ea7f51
Reviewed-on: https://go-review.googlesource.com/69711
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Along the way, switch to using relocation constants from debug/elf.
For #22095
Change-Id: I1a64353619f95dde5aa39060c4b9d001af7dc1e4
Reviewed-on: https://go-review.googlesource.com/69013
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
All of the amd64 entry point code is the same except for Plan 9.
Unify it all into asm_amd64.s.
Change-Id: Id47ce3a7bb2bb0fd48f326a2d88ed18b17dee456
Reviewed-on: https://go-review.googlesource.com/69292
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
There are two places in DWARF generation that create symbols when they
really just want to get the symbol if it exists. writeranges, in
particular, will create a DWARF range symbol for every single textp
symbol (though they won't get linked into any list, so they don't
affect the binary).
Fix these to use ROLookup instead of Lookup.
Change-Id: I401eadf22890e296bd08bccaa6ba2fd8fac800cd
Reviewed-on: https://go-review.googlesource.com/69971
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
In the distant past, Pipe was implemented with channels and a
long running pipe.run goroutine (see CL 994043).
This approach of having all communication serialized through the
run method was error prone giving Pipe a history of deadlocks
and race conditions.
After the introduction of sync.Cond, the implementation was rewritten
(see CL 4252057) to use condition variables and avoid the
long running pipe.run goroutine. While this implementation is superior
to the previous one, this implementation is strange in that the
p.data field is always set immediately prior to signaling the other
goroutine with Cond.Signal, effectively making the combination of the
two a channel-like operation. Inferior to a channel, however, this still
requires explicit locking around the p.data field.
The data+rwait can be effectively be replaced by a "chan []byte" to
inform a reader that there is data available.
The data+wwait can be effectively be replaced by a "chan int" to
inform a writer of how many bytes were read.
This implementation is a simplified from net.Pipe in CL 37402.
Change-Id: Ia5b26320b0525934fd87a3b69a091c787167f5aa
Reviewed-on: https://go-review.googlesource.com/65330
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Implement deadline functionality on Pipe so that it properly implements
the semantics of the Conn interface. This aids usages of Pipe (often in
unit tests) with a more realistic and complete implementation.
The new implementation avoids a dependency on a io.Pipe since it is
impossible to keep the prior semantics of synchronous reads and writes
while also trying to implement cancelation over an io.{Reader,Writer}
that fundamentally has no cancelation support.
The fact that net.Pipe is synchronous (and documented as such)
is unfortunate because no realistic network connection is synchronous.
Instead real networks introduces a read and write buffer of some sort.
However, we do not change the semantics for backwards compatibility.
The approach taken does not leave any long-running goroutines,
meaning that tests that never call Close will not cause a resource leak.
Fixes#18170
Change-Id: I5140b1f289a0a49fb2d485f031b5aa0ee99ecc30
Reviewed-on: https://go-review.googlesource.com/37402
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
On Windows, not closing f keeps us from being able to remove it.
Change-Id: Id4cb709b6ce0b30485b87364a9f0e6e71d2782bd
Reviewed-on: https://go-review.googlesource.com/70070
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
It looks like I forgot to reenable this test when I fixed#21522.
Update deps.go and reenable.
Change-Id: I68a45df09b418f48d93d2e7ab1d274e056c192e6
Reviewed-on: https://go-review.googlesource.com/70050
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
The content ID will be needed for content-based staleness
determination. It is defined as the SHA256 hash of the file
in which it appears, with occurrences of the build+content IDs
changed to zeros during the hashing operation.
Storing the content ID in the archives is a little tricky
but it means that later builds need not rehash the archives
each time they are referenced, so under the assumption
that each package is imported at least once after being
compiled, hashing at build time is a win. (Also the whole
file is more likely to be in cache at build time,
since we just wrote it.)
In my unscientific tests, the time for "go build -a std cmd"
rises from about 14.3s to 14.5s on my laptop, or under 2%.
Change-Id: Ia3d4dc657d003e8295631f73363868bd92ebf96a
Reviewed-on: https://go-review.googlesource.com/69054
Reviewed-by: David Crawshaw <crawshaw@golang.org>
The liveness analysis no longer directly emits PCDATA. Fix stale
comments that say so.
Change-Id: Id26b112ddf4c13a12ebf766f64bf57c68fbfe3ef
Reviewed-on: https://go-review.googlesource.com/67691
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
If the stack frame is too large, abort immediately.
We used to generate code first, then abort.
In issue 22200, generating code raised a panic
so we got an ICE instead of an error message.
Change the max frame size to 1GB (from 2GB).
Stack frames between 1.1GB and 2GB didn't used to work anyway,
the pcln table generation would have failed and generated an ICE.
Fixes#22200
Change-Id: I1d918ab27ba6ebf5c87ec65d1bccf973f8c8541e
Reviewed-on: https://go-review.googlesource.com/69810
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This CL does a few things.
1. It moves the existing "read a build ID" code out of the go command
and into cmd/internal/buildid.
2. It adds new code there to "write a build ID".
3. It adds better tests.
4. It encapsulates cmd/internal/buildid into a new standalone program
"go tool buildid".
The go command is going to use the new "write a build ID" functionality
in a future CL. Adding the separate "go tool buildid" gives "go build -x"
a printable command to explain what it is doing in that new step.
(This is similar to the go command printing "go tool pack" commands
equivalent to the actions it is taking, even though it's not invoking pack
directly.) Keeping go build -x honest means that other build systems can
potentially keep up with the go command.
Change-Id: I01c0a66e30a80fa7254e3f2879283d3cd7aa03b4
Reviewed-on: https://go-review.googlesource.com/69053
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This makes it more obvious which of the two builds is failing by
putting "dbg" or "opt" directly in the test name. It also makes it
possible for them to fail independently, so a failure in "dbg" doesn't
mask a failure in "opt", and to visibly skip the opt test when run
with an unoptimized runtime.
Change-Id: I3403a7fd3c1a13ad51a938bb95dfe54c320bb58e
Reviewed-on: https://go-review.googlesource.com/69970
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Right now users have to infer why they would want LockOSThread and
when it may or may not be appropriate to call UnlockOSThread. This
requires some understanding of Go's internal thread pool
implementation, which is unfortunate.
Improve the situation by making the documentation on these functions
more prescriptive so users can figure out when to use them even if
they don't know about the scheduler.
Change-Id: Ide221791e37cb5106dd8a172f89fbc5b3b98fe32
Reviewed-on: https://go-review.googlesource.com/52871
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
runtime.LockOSThread is sometimes used when the caller intends to put
the OS thread into an unusual state. In this case, we never want to
return this thread to the runtime thread pool. However, currently
exiting the goroutine implicitly unlocks its OS thread.
Fix this by terminating the locked OS thread when its goroutine exits,
rather than simply returning it to the pool.
Fixes#20395.
Change-Id: I3dcec63b200957709965f7240dc216fa84b62ad9
Reviewed-on: https://go-review.googlesource.com/46038
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Currently, threads created by the runtime exist until the whole
program exits. For #14592 and #20395, we want to be able to exit and
clean up threads created by the runtime. This commit implements that
mechanism.
The main difficulty is how to clean up the g0 stack. In cgo mode and
on Solaris and Windows where the OS manages thread stacks, we simply
arrange to return from mstart and let the system clean up the thread.
If the runtime allocated the g0 stack, then we use a new exitThread
syscall wrapper that arranges to clear a flag in the M once the stack
can safely be reaped and call the thread termination syscall.
exitThread is based on the existing exit1 wrapper, which was always
meant to terminate the calling thread. However, exit1 has never been
used since it was introduced 9 years ago, so it was broken on several
platforms. exitThread also has the additional complication of having
to flag that the stack is unused, which requires some tricks on
platforms that use the stack for syscalls.
This still leaves the problem of how to reap the unused g0 stacks. For
this, we move the M from allm to a new freem list as part of the M
exiting. Later, allocm scans the freem list, finds Ms that are marked
as done with their stack, removes these from the list and frees their
g0 stacks. This also allows these Ms to be garbage collected.
This CL does not yet use any of this functionality. Follow-up CLs
will. Likewise, there are no new tests in this CL because we'll need
follow-up functionality to test it.
Change-Id: Ic851ee74227b6d39c6fc1219fc71b45d3004bc63
Reviewed-on: https://go-review.googlesource.com/46037
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Every cmd/thing is 'go tool thing' except for go and gofmt.
But the table in cmd/go enumerates all the things instead of
saying that go and gofmt are the exceptions.
Change that, so that when adding new tools it's not
necessary to update this table.
Change-Id: Ia6fef41b4d967249b19971a0d03e5acb0317ea82
Reviewed-on: https://go-review.googlesource.com/69052
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Currently, since Ms never exit, the number of Ms, the number of Ms
ever created, and the ID of the next M are all the same and must be
small. That's about to change, so rename sched.mcount to sched.mnext
to make it clear it's the number of Ms ever created (and the ID of the
next M), change its type to int64, and use mcount() for the number of
Ms. In the next commit, mcount() will become slightly less trivial.
For #20395.
Change-Id: I9af34d36bd72416b5656555d16e8085076f1b196
Reviewed-on: https://go-review.googlesource.com/68750
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Today they happen during the build phase; they should happen
during the load phase instead, along with the C check.
Change-Id: I6074a995b8e29275549aafa574511b735642d85b
Reviewed-on: https://go-review.googlesource.com/69051
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
mstart is the entry point for new threads, so it certainly can't
interact with GC enough to have write barriers. We move the one small
piece that is allowed to have write barriers out into its own
function.
Change-Id: Id9c31d6ffac31d0051fab7db15eb428c11cadbad
Reviewed-on: https://go-review.googlesource.com/46035
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Logically the build needs to start treating a.Package as immutable,
since we might want to build a.Package multiple ways.
Record the built target in a.built instead.
Right now a.built is predictable ahead of time, but we want to
move toward satisfying some builds from a cache directory,
in which case a.built will point into the cache directory
and not be determined until action execution time.
There is probably more to do with shared libraries, but this
does not break what's there.
Change-Id: I941988b520bee2f664fd8cabccf389e1dc29628b
Reviewed-on: https://go-review.googlesource.com/69050
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This field is really a *m (modulo its bottom bit). Change it from
uintptr to muintptr to document this fact.
Change-Id: I2d181a955ef1d2c1a268edf20091b440d85726c9
Reviewed-on: https://go-review.googlesource.com/46034
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Everything got a bit tangled together in b.action1.
Try to tease things apart again.
In general this is a refactoring of the existing code, with limited
changes to the effect of the code.
The main additional change is to complete a.Deps for link actions.
That list now directly contains all the inputs the linker will attempt
to read, eliminating the need for a transitive traversal of the entire
action graph to find those. The comepleteness of a.Deps will be
important when we eventually use it to decide whether an cached
action output can be reused.
all.bash passes, but it's possible I've broken some subtety of
buildmode=shared again. Certainly that code took the longest
to get working.
Change-Id: I34e849eda446dca45a9cfce02b07bec6edb6d0d4
Reviewed-on: https://go-review.googlesource.com/69831
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Applications that need to manipulate kernel thread state are currently
on thin ice in Go: they can use LockOSThread to prevent other
goroutines from running on the manipulated thread, but Go may clone
this manipulated state into a new thread that's put into the runtime's
thread pool along with other threads.
Fix this by never starting a new thread from a locked thread or a
thread that may have been started by C. Instead, the runtime starts a
"template thread" with a known-good state. If it then needs to start a
new thread but doesn't know that the current thread is in a good
state, it forwards the thread creation to the template thread.
Fixes#20676.
Change-Id: I798137a56e04b7723d55997e9c5c085d1d910643
Reviewed-on: https://go-review.googlesource.com/46033
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
To the extent that invoking the compiler and invoking the linker
have different dependency requirements, representing both steps
by a single action node leads to confusion.
If we move to having separate .a and .x (import metadata) files
in the standard builds, then the .a is a link dependency but not
a compile dependency, and vice versa for .x.
Today, in shared library builds, the .a is a compile dependency
and a link dependency, while the .so is only a link dependency.
Also in this CL: change the gccgo link step to extract _cgo_flags
into root.Objdir, which is private to the link step, instead of into
b.WorkDir, which is shared by all the link steps that could possibly
be running in parallel. And attempt to handle the -n and -x flags
when loading _cgo_flags, instead of dying attempting to read
an archive that wasn't written.
Also in this CL: create a.Objdir before running a.Func, to avoid
duplicating the Mkdir(a.Objdir) in every a.Func.
A future CL will update the link action's Deps to be accurate.
(Right now the link steps search out the true Deps by walking
the entire action graph.)
Change-Id: I15128ce2bd064887f98abc3a4cf204241f518631
Reviewed-on: https://go-review.googlesource.com/69830
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Compiled from various tables found around the internet.
Some of these are used by cmd/link.
Change-Id: I258b25e694dbe91a61d675763f2c47ccc928fd70
Reviewed-on: https://go-review.googlesource.com/69012
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This error was not used when using git because nested git is permitted.
Add test using Mercurial, so that at least we have a test, even though
the test is not run by default.
Fixes#22157Fixes#22201
Change-Id: If521f3c09b0754e00e56fa3cd0364764a57a43ad
Reviewed-on: https://go-review.googlesource.com/69670
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This is a preparation step for adding vDSO support on linux/386.
In a follow-on change, the vDSO ELF symbol lookup code in this
file will be refactored so it can be used on multiple architectures.
First, move the file to an architecture-neutral file name so that
the change history is preserved. Build tags are added so that the
build behaves as it did before.
vdso_linux_amd64.go will be recreated later, just containing the
amd64 specifics.
If the move and refactor were combined in a single change, then the
history to date would be lost because git would see the existing code
as a new file.
Change-Id: Iddb5da0d7faf141fd7cc835fe6a80c80153897e9
Reviewed-on: https://go-review.googlesource.com/69710
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Focused on ranges, selects and switches for this one.
While at it, simplify some vars in typecheckselect.
Updates #19683.
Change-Id: Ib6aabe0f6826cb1930483aeb4bb2de1ff8052d9e
Reviewed-on: https://go-review.googlesource.com/69690
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
OTYPESW Op comment says
// List = Left.(type)
this seems to be wrong. Adding
fmt.Printf("n: %v\n", cond)
fmt.Printf(" n.List: %v\n", cond.List)
fmt.Printf(" n.Left: %v\n", cond.Left)
fmt.Printf(" n.Right: %v\n", cond.Right)
to (s *typeSwitch) walk(sw *Node), and compiling the following code
snippet
var y interface{}
switch x := y.(type) {
default:
println(x)
}
prints
n: <node TYPESW>
n.List:
n.Left: x
n.Right: y
The correct OTYPESW Node field positions are
// Left = Right.(type)
This is confirmed by the fact that, further in the code,
typeSwitch.walk() checks that Right (and not Left) is of type
interface:
cond.Right = walkexpr(cond.Right, &sw.Ninit)
if !cond.Right.Type.IsInterface() {
yyerror("type switch must be on an interface")
return
}
This patch fixes the OTYPESW comment.
Change-Id: Ief1e409cfabb7640d7f7b0d4faabbcffaf605450
Reviewed-on: https://go-review.googlesource.com/69112
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This re-enables functionality that inadvertently was disabled in the
(long) past.
Also, don't perform branch checks if we had errors in a function
to avoid spurious errors or (worst-case) crashes.
Slightly modified test/fixedbugs/issue14006.go to make sure the
test still reports invalid label errors (the surrounding function
must be syntactically correct).
Change-Id: Id5642930877d7cf3400649094ec75c753b5084b7
Reviewed-on: https://go-review.googlesource.com/69770
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This change fixes the implementation of Data Cache instructions for
ppc64x, allowing non-zero hint field values.
Change-Id: I454aac9293d069a4817ee574d5809fa1799b3216
Reviewed-on: https://go-review.googlesource.com/68670
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
CL 59230 changed Writer.WriteHeader to ignore the ChangeTime and AccessTime
fields when considering using the USTAR format when the format is unspecified.
This policy is confusing and leads to unexpected behavior where some files
have ModTime only, while others have ModTime+AccessTime+ChangeTime if the
format became PAX for some unrelated reason (e.g., long pathname).
Change the policy to simply always ignore ChangeTime, AccessTime, and
sub-second time resolutions unless the user explicitly specifies a format.
This is a safe policy change since WriteHeader had no support for the
above features in any Go release.
Support for ChangeTime and AccessTime was added in CL 55570.
Support for sub-second times was added in CL 55552.
Both CLs landed after the latest Go release (i.e., Go1.9), which was
cut from the master branch around August 6th, 2017.
Change-Id: Ib82baa1bf9dd4573ed4f674b7d55d15f733a4843
Reviewed-on: https://go-review.googlesource.com/69296
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The USTAR format says:
<<<
Implementors should be aware that the previous file format did not include
a mechanism to archive directory type files.
For this reason, the convention of using a filename ending with
<slash> was adopted to specify a directory on the archive.
>>>
In light of this suggestion, make the following changes:
* Writer.WriteHeader refuses to encode a header where a file that
is obviously a file-type has a trailing slash in the name.
* formatter.formatString avoids encoding a trailing slash in the event
that the string is truncated (the full string will be encoded elsewhere,
so stripping the slash is safe).
* Reader.Next treats a TypeRegA (which is the zero value of Typeflag)
as a TypeDir if the name has a trailing slash.
Change-Id: Ibf27aa8234cce2032d92e5e5b28546c2f2ae5ef6
Reviewed-on: https://go-review.googlesource.com/69293
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
mkinlcall1 already guards against recursively inlining functions into
themselves, so there's no need to clear and restore fn.Func.Inl during
recursive inlining.
Passes toolstash-check.
Change-Id: I8bf0c8dea8788d94d3ea5670610b4acb1d26d2fb
Reviewed-on: https://go-review.googlesource.com/69310
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
We've supported inlining methods called as functions for a while now.
Change-Id: I53fba426e45f91d65a38f00456c2ae1527372b50
Reviewed-on: https://go-review.googlesource.com/69530
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This should make parallel execution a bit clearer.
With -p=1 it should make the execution completely unambiguous.
Fixes#19280.
Change-Id: Ib48cdfe96896d01b0d8f98ccb2fab614407a7d92
Reviewed-on: https://go-review.googlesource.com/49430
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Before, -1 meant a node being nil or not an OLITERAL, and 0 meant an
OLITERAL missing a Val.
However, the use of this value was confusing and led to some issues,
such as swt.go checking for < 0 instead of <= 0, causing panics.
We never need to differentiate these two cases, so collapse both into 0.
To make it clear that negative values can no longer happen, make Ctype
an uint8.
With this change, we can now get rid of the two n.Type == nil checks
in swt.go added to fix a couple of these panics.
Thanks to Matthew Dempsky for spotting this inconsistency.
Fixes#22001.
Change-Id: I51c65a76f38a3e16788b6a3b57932dad3436dc7e
Reviewed-on: https://go-review.googlesource.com/69510
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
ADDconst op is no longer used for addresses, as we lower Addr to
MOVDaddr. There is no rule that produces ADDconst with a non-nil
sym. So we can remove the sym aux field in ADDconst and limit its
use for adding constant (not offset to symbol).
Passes "toolstash -cmp" on std cmd for GOARCH=ppc64 and ppc64le.
Change-Id: Icee35cdb34d8d121ad7035076dfd07595c7ff809
Reviewed-on: https://go-review.googlesource.com/69450
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
