We already inlined
_, ok = e.(T)
_, ok = i.(E)
_, ok = e.(E)
The only ok-only variants not inlined are now
_, ok = i.(I)
_, ok = e.(I)
These call getitab, so are non-trivial.
Change-Id: Ie45fd8933ee179a679b92ce925079b94cff0ee12
Reviewed-on: https://go-review.googlesource.com/26658
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Now that assembler opcodes have their own type, they can have a true
stringer, rather than explicit calls to Aconv, which makes for nicer
format strings.
Change-Id: Ic77f5f8ac38b4e519dcaa08c93e7b732226f7bfe
Reviewed-on: https://go-review.googlesource.com/25045
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Give *recordingConn the correct WriteTo signature
to be an io.WriterTo. This makes vet happy.
It also means that it'll report errors,
which were previously being ignored.
Updates #11041
Change-Id: I13f171407d63f4b62427679bff362eb74faddca5
Reviewed-on: https://go-review.googlesource.com/27121
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
container/list/list_test.go:274: self-assignment of e1 to e1
container/list/list_test.go:274: self-assignment of e4 to e4
container/list/list_test.go:282: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e4 to e4
Updates #11041
Change-Id: Ibd90cf6a924e93497908f437b814c3fc82937f4a
Reviewed-on: https://go-review.googlesource.com/27114
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
CL 23393 introduces PAUTOHEAP, and access of PAUTOHEAP variable is
rewritten to indirection of a PAUTO variable. Mark this variable
non-nil, so this indirection does not introduce extra nil checks.
Change-Id: I31853eed5e60238b6c5bc0546e2e9ab340dcddd9
Reviewed-on: https://go-review.googlesource.com/26831
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
We were generating format strings containing
a lone %. Vet legitimately complains:
cmd/compile/internal/gc/constFold_test.go:339: unrecognized printf verb ' '
The fix doesn't make for very readable code,
but it is simple and obviously correct.
Updates #11041
Change-Id: I90bd2d1d140887f5229752a279f7e46921472fbb
Reviewed-on: https://go-review.googlesource.com/27115
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This is preliminary work to unifying them.
Aside from Syscall9, all are identical.
Syscall9 has a netbsd/openbsd variant
and a dragonfly/freebsd variant.
Updates #11041
Change-Id: Ia5ce95d5e9115d4c0492d5e53aa7a4316deafd1f
Reviewed-on: https://go-review.googlesource.com/25115
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This is preliminary work to unifying the
unix amd64 assembly implementations,
which is preliminary work to making the
assembly vet-friendly.
Updates #11041
Change-Id: Ic64985124f8fb86cc08898be2ec7fca972ced4ca
Reviewed-on: https://go-review.googlesource.com/25113
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
They were identical.
This will allow us to do the TODO at the top
of the file only once.
Updates #11041
Change-Id: I07aaca27ae46b66b65780082988bdc7546ed534b
Reviewed-on: https://go-review.googlesource.com/25112
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Darwin linker does not support BR26 reloc with non-zero addend.
Fixes#16724.
Change-Id: I1b5b4dc7159141bde3e273490f435c08c583afaf
Reviewed-on: https://go-review.googlesource.com/27081
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
If the server failed on us before we even tried to write any bytes,
it's safe to retry the request on a new connection, regardless of the
HTTP method/idempotence.
Fixes#15723
Change-Id: I25360f82aac530d12d2b3eef02c43ced86e62906
Reviewed-on: https://go-review.googlesource.com/27117
Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Preallocate keys slice with the length of paxHeaders map
to prevent slice growth with append operations.
Change-Id: Ic9a927c4eaa775690a4ef912d61dd06f38e11510
Reviewed-on: https://go-review.googlesource.com/23782
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Let the kernel pick a port for testing, and have the server in the
child process tell the parent (benchmarking) process the port that
was selected.
Fixes flakes like seen in https://golang.org/cl/27050 (and previously)
Change-Id: Ia2b705dc4152f70e0a5725015bdae09984d09d53
Reviewed-on: https://go-review.googlesource.com/27051
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Methods of FileSet are documented to be safe for concurrent use by
multiple goroutines, so FileSet is protected by a mutex and all its
methods use it to prevent concurrent mutations. All methods of File that
mutate the respective FileSet, including AddLine, do also lock its
mutex, but that does not help when PositionFor is invoked concurrently
and reads without synchronization what AddLine mutates.
The change adds acquiring a RLock around the racy call of File.position
and the respective test.
Fixes#16548
Change-Id: Iecaaa02630b2532cb29ab555376633ee862315dd
Reviewed-on: https://go-review.googlesource.com/25345
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
`bytes` and `strings` are pretty similar to each other, this commit
brings `strings` examples to its counter-part.
Partially addresses #16360
Change-Id: I551320eaa78be9df69012035f1c3333f500e04c9
Reviewed-on: https://go-review.googlesource.com/25062
Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The heap.Fix function calls both down and up. If the element is moved
down, we don't need to call up and we could save a comparison.
(per suggestion by Radu Berinde)
Fixes#16098.
Change-Id: I83a74710e66cf0d274d8c0743338c26f89f31afe
Reviewed-on: https://go-review.googlesource.com/24273
Reviewed-by: Robert Griesemer <gri@golang.org>
When dynamically linking, a type symbol's name is replaced with a name based on
the SHA1 of the name as type symbol's names can be very long. However, this
can make a type's symbol name longer in some cases. So skip it in that case.
One of the symbols this changes the treatment of is 'type.string' and that fixes a
bug where -X doesn't work when dynamically linking.
Fixes#16671
Change-Id: If5269038261b76fb0ec52e25a9c1d64129631e3c
Reviewed-on: https://go-review.googlesource.com/26890
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
We already had special cases for 0 and 1. Add 2 and 3 for now too.
To be removed if the compiler is improved later (#6714).
This halves the number of allocations and total bytes allocated via
common filepath.Join calls, improving filepath.Walk performance.
Noticed as part of investigating filepath.Walk in #16399.
Change-Id: If7b1bb85606d4720f3ebdf8de7b1e12ad165079d
Reviewed-on: https://go-review.googlesource.com/25005
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
VPSHUFD should take an unsigned argument to be consistent with
PSHUFD. Also fix all usage.
Fixes#16499
Change-Id: Ie699c102afed0379445914a251710365b14d89b6
Reviewed-on: https://go-review.googlesource.com/25383
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
It was not responsive to the sizes param.
Remove it, and unwind the extra layers.
Fixes#16316
Change-Id: I940a57184a1601f52348d4bff8638f3f7462f5cd
Reviewed-on: https://go-review.googlesource.com/26995
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
autopkg == localpkg, so it appears to be a remnant of earlier code.
Change-Id: I65b6c074535e877317cbf9f1f35e94890f0ebf14
Reviewed-on: https://go-review.googlesource.com/26662
Reviewed-by: Keith Randall <khr@golang.org>
1) Removed mark field from declInfo struct. Instead use a visited map
in ordering.go which was the only use place for the mark field.
2) Introduced objSet type for the common map[Object]bool type.
3) Improved comments.
Change-Id: I7544e7458d844b0ca08193f11de6238d317eaf2d
Reviewed-on: https://go-review.googlesource.com/24153
Reviewed-by: Alan Donovan <adonovan@google.com>
The old algorithm operated on a dependency graph that included
all objects (including functions) for simplicity: it was based
directly on the dependencies collected for each object during
type checking an object's initialization expression. It also
used that graph to compute the objects involved in an erroneous
initialization cycle.
Cycles that consist only of (mutually recursive) functions are
permitted in initialization code; so those cycles were silently
ignored if encountered. However, such cycles still inflated the
number of dependencies a variable might have (due to the cycle),
which in some cases lead to the wrong variable being scheduled
for initialization before the one with the inflated dependency
count.
Correcting for the cycle when it is found is too late since at
that point another variable may have already been scheduled.
The new algorithm computes the initialization dependency graph as
before but adds an extra pass during which functions are eliminated
from the graph (and their dependencies are "back-propagated").
This eliminates the problem of cycles only involving functions
(there are no functions).
When a cycle is found, the new code computes the cycle path from
the original object dependencies so it can still include functions
on the path as before, for the same detailed error message.
The new code also more clearly distinguishes between objects that
can be in the dependency graph (constants, variables, functions),
and objects that cannot, by introducing the dependency type, a new
subtype of Object. As a consequence, the dependency graph is smaller.
Fixes#10709.
Change-Id: Ib58d6ea65cfb279041a0286a2c8e865f11d244eb
Reviewed-on: https://go-review.googlesource.com/24131
Reviewed-by: Alan Donovan <adonovan@google.com>
The Darwin-only restriction was because we were late in the Go 1.7
cycle when the test was added.
In the process, I noticed Gettimeofday wasn't in the "unimplemented
midden heap" section of syscall_nacl.go, despite this line in the
original go1.txt:
pkg syscall, func Gettimeofday(*Timeval) error
So, add it, returning ENOSYS like the others.
Change-Id: Id7e02e857b753f8d079bee335c22368734e92254
Reviewed-on: https://go-review.googlesource.com/26772
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Quentin Smith <quentin@golang.org>
Code movement only.
If someone finds function 'foo' in "foo_linux.go",
they will expect that the Window version of 'foo' exists in "foo_windows.go".
Current code doesn't follow this manner.
For example, 'sameFile' exists in "file_unix.go",
"stat_plan9.go" and "types_windows.go".
The CL address that problem by following rules:
* readdir family => dir.go, dir_$GOOS.go
* stat family => stat.go, stat_$GOOS.go
* path-functions => path_$GOOS.go
* sameFile => types.go, types_$GOOS.go
* process-functions => exec.go, exec_$GOOS.go
* hostname => sys.go, sys_$GOOS.go
Change-Id: Ic3c64663ce0b2a364d7a414351cd3c772e70187b
Reviewed-on: https://go-review.googlesource.com/27035
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Merging from dev.ssa back into master.
Contains complete SSA backends for arm, arm64, 386, amd64p32.
Work in progress for PPC64.
Change-Id: Ifd7075e3ec6f88f776e29f8c7fd55830328897fd
Passes ssa_test.
Requires a few new instructions and some scratchpad
memory to move data between G and F registers.
Also fixed comparisons to be correct in case of NaN.
Added missing instructions for run.bash.
Removed some FP registers that are apparently "reserved"
(but that are also apparently also unused except for a
gratuitous multiplication by two when y = x+x would work
just as well).
Currently failing stack splits.
Updates #16010.
Change-Id: I73b161bfff54445d72bd7b813b1479f89fc72602
Reviewed-on: https://go-review.googlesource.com/26813
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Add more ARM64 optimizations:
- use hardware zero register when it is possible.
- use shifted ops.
The assembler supports shifted ops but not documented, nor knows
how to print it. This CL adds them.
- enable fast division.
This was disabled because it makes the old backend generate slower
code. But with SSA it generates faster code.
Turn on SSA by default, also adjust tests.
Change-Id: I7794479954c83bb65008dcb457bc1e21d7496da6
Reviewed-on: https://go-review.googlesource.com/26950
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
We shouldn't issue instructions like MOVL foo(SB), AX directly from the
SSA backend. Instead we should do LEAL foo(SB), AX; MOVL (AX), AX.
This simplifies obj logic because now only LEAL needs to be treated
specially. The register allocator uses the LEAL to in effect allocate
the temporary register required for the shared library thunk calls.
Also, the LEALs can now be CSEd. So code like
var g int
func f() { g += 5 }
Requires only one thunk call instead of 2.
Change-Id: Ib87d465f617f73af437445871d0ea91a630b2355
Reviewed-on: https://go-review.googlesource.com/26814
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
In position-independent 386 code, loading floating-point constants from
the constant pool requires two steps: materializing the address of
the constant pool entry (requires calling a thunk) and then loading
from that address.
Before this CL, the materializing happened implicitly in CX, which
clobbered that register.
Change-Id: Id094e0fb2d3be211089f299e8f7c89c315de0a87
Reviewed-on: https://go-review.googlesource.com/26811
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When a constant can be encoded in a logical instruction (BITCON), do
it this way instead of using the constant pool. The BITCON testing
code runs faster than table lookup (using map):
(on AMD64 machine, with pseudo random input)
BenchmarkIsBitcon-4 300000000 4.04 ns/op
BenchmarkTable-4 50000000 27.3 ns/op
The equivalent C code of BITCON testing is formally verified with
model checker CBMC against linear search of the lookup table.
Also handle cases when a constant can be encoded in a MOV instruction.
In this case, materializa the constant into REGTMP without using the
constant pool.
When constants need to be added to the constant pool, make sure to
check whether it fits in 32-bit. If not, store 64-bit.
Both legacy and SSA compiler backends are happy with this.
Fixes#16226.
Change-Id: I883e3069dee093a1cdc40853c42221a198a152b0
Reviewed-on: https://go-review.googlesource.com/26631
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When ns/op dropped below 1, the old code
ignored benchtime and reverted to 1s.
Change-Id: I59752cef88d8d73bfd5b085f5400ae657f78504e
Reviewed-on: https://go-review.googlesource.com/26664
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
Last part of the 386 SSA port.
Modify the x86 backend to simulate SSE registers and
instructions with 387 registers and instructions.
The simulation isn't terribly performant, but it works,
and the old implementation wasn't very performant either.
Leaving to people who care about 387 to optimize if they want.
Turn on SSA backend for 386 by default.
Fixes#16358
Change-Id: I678fb59132620b2c47e993c1c10c4c21135f70c0
Reviewed-on: https://go-review.googlesource.com/25271
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Use the destination register for materializing the pc
for GOT references also. See https://go-review.googlesource.com/c/25442/
The SSA backend assumes CX does not get clobbered for these instructions.
Mark duffzero as clobbering CX. The linker needs to clobber CX
to materialize the address to call. (This affects the non-shared-library
duffzero also, but hopefully forbidding one register across duffzero
won't be a big deal.)
Hopefully this is all the cases where the linker is clobbering CX
under the hood and SSA assumes it isn't.
Change-Id: I080c938170193df57cd5ce1f2a956b68a34cc886
Reviewed-on: https://go-review.googlesource.com/26611
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Access to globals requires a 2-instruction sequence on PIC 386.
MOVL foo(SB), AX
is translated by the obj package into:
CALL getPCofNextInstructionInTempRegister(SB)
MOVL (&foo-&thisInstruction)(tmpReg), AX
The call returns the PC of the next instruction in a register.
The next instruction then offsets from that register to get the
address required. The tricky part is the allocation of the
temp register. The legacy compiler always used CX, and forbid
the register allocator from allocating CX when in PIC mode.
We can't easily do that in SSA because CX is actually a required
register for shift instructions. (I think the old backend got away
with this because the register allocator never uses CX, only
codegen knows that shifts must use CX.)
Instead, we allow the temp register to be anything. When the
destination of the MOV (or LEA) is an integer register, we can
use that register. Otherwise, we make sure to compile the
operation using an LEA to reference the global. So
MOVL AX, foo(SB)
is never generated directly. Instead, SSA generates:
LEAL foo(SB), DX
MOVL AX, (DX)
which is then rewritten by the obj package to:
CALL getPcInDX(SB)
LEAL (&foo-&thisInstruction)(DX), AX
MOVL AX, (DX)
So this CL modifies the obj package to use different thunks
to materialize the pc into different registers. We use the
registers that regalloc chose so that SSA can still allocate
the full set of registers.
Change-Id: Ie095644f7164a026c62e95baf9d18a8bcaed0bba
Reviewed-on: https://go-review.googlesource.com/25442
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
It's not a new backend, just a PtrSize==4 modification
of the existing AMD64 backend.
Change-Id: Icc63521a5cf4ebb379f7430ef3f070894c09afda
Reviewed-on: https://go-review.googlesource.com/25586
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
The Go HTTP/1 client will make as many new TCP connections as the user requests.
The HTTP/2 client tried to have that behavior, but the policy of
whether a connection is re-usable didn't take into account the extra 1
stream counting against SETTINGS_MAX_CONCURRENT_STREAMS so in practice
users were getting errors.
For example, if the server's advertised max concurrent streams is 100
and 200 concurrrent Go HTTP requests ask for a connection at once, all
200 will think they can reuse that TCP connection, but then 100 will
fail later when the number of concurrent streams exceeds 100.
Instead, recognize the "no cached connections" error value in the
shouldRetryRequest method, so those 100 will retry a new connection.
This is the conservative fix for Go 1.7 so users don't get errors, and
to match the HTTP/1 behavior. Issues #13957 and #13774 are the more
involved bugs for Go 1.8.
Updates #16582
Updates #13957
Change-Id: I1f15a7ce60c07a4baebca87675836d6fe03993e8
Reviewed-on: https://go-review.googlesource.com/25580
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reg allocator skips flag-typed values. Flag allocator uses the type
and whether the op has "clobberFlags" set.
Tested on AMD64, ARM, ARM64, 386. Passed 'toolstash -cmp' on AMD64.
PPC64 is coded blindly.
Change-Id: Ib1cc27efecef6a1bb27f7d7ed035a582660d244f
Reviewed-on: https://go-review.googlesource.com/25480
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Fixes#16618.
Change-Id: Iffada12e8672bbdbcf2e787782c497e2c45701b1
Reviewed-on: https://go-review.googlesource.com/25550
Run-TryBot: Minux Ma <minux@golang.org>
Reviewed-by: Arjan Van De Ven <arjan.van.de.ven@intel.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Fixes#16570 on iOS.
Thanks Daniel Burhans for reporting the bug and testing the fix.
Change-Id: I43ae7b78c8f85a131ed3d93ea59da9f32a02cd8f
Reviewed-on: https://go-review.googlesource.com/25481
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reportedly waitid is not available for Ubuntu on Windows.
Fixes#16610.
Change-Id: Ia724f45a85c6d3467b847da06d8c65d280781dcd
Reviewed-on: https://go-review.googlesource.com/25507
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Updates bundled http2 to x/net/http2 git rev 075e191 for:
http2: adjust flow control on open streams when processing SETTINGS
https://golang.org/cl/25508Fixes#16612
Change-Id: Ib0513201bff44ab747a574ae6894479325c105d2
Reviewed-on: https://go-review.googlesource.com/25543
Run-TryBot: Chris Broadfoot <cbro@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Includes hmul (all widths)
compare for boolean result and simplifications
shift operations plus changes/additions for implementation
(ORN, ADDME, ADDC)
Also fixed a backwards-operand CMP.
Change-Id: Id723c4e25125c38e0d9ab9ec9448176b75f4cdb4
Reviewed-on: https://go-review.googlesource.com/25410
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
When compiling with -buildmode=shared, a map[int32]*_type is created for
each extra module mapping duplicate types back to a canonical object.
This is done in the function typelinksinit, which is called before the
init function that sets up the hash functions for the map
implementation. The result is typemap becomes unusable after
runtime initialization.
The fix in this CL is to move algorithm init before typelinksinit in
the runtime setup process. (For 1.8, we may want to turn typemap into
a sorted slice of types and use binary search.)
Manually tested on GOOS=linux with:
GOHOSTARCH=386 GOARCH=386 ./make.bash && \
go install -buildmode=shared std && \
cd ../test && \
go run run.go -linkshared
Fixes#16590
Change-Id: Idc08c50cc70d20028276fbf564509d2cd5405210
Reviewed-on: https://go-review.googlesource.com/25469
Run-TryBot: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Previously, genMatch0 and genResult0 contained
lots of duplication: locating the op, parsing
the value, validation, etc.
Parsing and validation was mixed in with code gen.
Extract a helper, parseValue. It is responsible
for parsing the value, locating the op, and doing
shared validation.
As a bonus (and possibly as my original motivation),
make op selection pay attention to the number
of args present.
This allows arch-specific ops to share a name
with generic ops as long as there is no ambiguity.
It also detects and reports unresolved ambiguity,
unlike before, where it would simply always
pick the generic op, with no warning.
Also use parseValue when generating the top-level
op dispatch, to ensure its opinion about ops
matches genMatch0 and genResult0.
The order of statements in the generated code used
to depend on the exact rule. It is now somewhat
independent of the rule. That is the source
of some of the generated code changes in this CL.
See rewritedec64 and rewritegeneric for examples.
It is a one-time change.
The op dispatch switch and functions used to be
sorted by opname without architecture. The sort
now includes the architecture, leading to further
generated code changes.
See rewriteARM and rewriteAMD64 for examples.
Again, it is a one-time change.
There are no functional changes.
Change-Id: I22c989183ad5651741ebdc0566349c5fd6c6b23c
Reviewed-on: https://go-review.googlesource.com/24649
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
macOS Sierra beta4 changed the kernel interface for getting time.
DX now optionally points to an address for additional info.
Set it to zero to avoid corrupting memory.
Fixes#16570
Change-Id: I9f537e552682045325cdbb68b7d0b4ddafade14a
Reviewed-on: https://go-review.googlesource.com/25400
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Quentin Smith <quentin@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The commit in golang.org/cl/22354 groups constructors functions under
the type that they construct to. However, this caused a minor regression
where functions that had unexported return values were not being printed
at all. Thus, we forgo the grouping logic if the type the constructor falls
under is not going to be printed.
Fixes#16568
Change-Id: Idc14f5d03770282a519dc22187646bda676af612
Reviewed-on: https://go-review.googlesource.com/25369
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Changes made:
* Disallow star expression on interfaces as this is not possible.
* Show an embedded "error" in an interface as public similar to
how godoc does it.
* Properly handle selector expressions in both structs and interfaces.
This is possible since a type may refer to something defined in
another package (e.g. io.Reader).
Before:
<<<
$ go doc runtime.Error
type Error interface {
// RuntimeError is a no-op function but
// serves to distinguish types that are run time
// errors from ordinary errors: a type is a
// run time error if it has a RuntimeError method.
RuntimeError()
// Has unexported methods.
}
$ go doc compress/flate Reader
doc: invalid program: unexpected type for embedded field
doc: invalid program: unexpected type for embedded field
type Reader interface {
io.Reader
io.ByteReader
}
>>>
After:
<<<
$ go doc runtime.Error
type Error interface {
error
// RuntimeError is a no-op function but
// serves to distinguish types that are run time
// errors from ordinary errors: a type is a
// run time error if it has a RuntimeError method.
RuntimeError()
}
$ go doc compress/flate Reader
type Reader interface {
io.Reader
io.ByteReader
}
>>>
Fixes#16567
Change-Id: I272dede971eee9f43173966233eb8810e4a8c907
Reviewed-on: https://go-review.googlesource.com/25365
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This was previously fixed in https://golang.org/cl/21497 but not enough.
Fixes#16523
Change-Id: I678543a656304c82d654e25e12fb094cd6cc87e8
Reviewed-on: https://go-review.googlesource.com/25330
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
SSA compiler on AMD64 may spill Duff-adjusted address as scalar. If
the object is on stack and the stack moves, the spilled address become
invalid.
Making the spill pointer-typed does not work. The Duff-adjusted address
points to the memory before the area to be zeroed and may be invalid.
This may cause stack scanning code panic.
Fix it by doing Duff-adjustment in genValue, so the intermediate value
is not seen by the reg allocator, and will not be spilled.
Add a test to cover both cases. As it depends on allocation, it may
be not always triggered.
Fixes#16515.
Change-Id: Ia81d60204782de7405b7046165ad063384ede0db
Reviewed-on: https://go-review.googlesource.com/25309
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Apparently the old backend needs NEG instruction having RegRead set,
even this instruction does not take a Reg field... I don't think SSA
uses this flag, so just leave it as it was. SSA is still happy.
Fix ARM64 build on https://build.golang.org/?branch=dev.ssa
Change-Id: Ia7e7f2ca217ddae9af314d346af5406bbafb68e8
Reviewed-on: https://go-review.googlesource.com/25302
Reviewed-by: David Chase <drchase@google.com>
Mutator goroutines that allocate memory during the concurrent mark
phase are required to spend some time assisting the garbage
collector. The magnitude of this mandatory assistance is proportional
to the goroutine's allocation debt and subject to the assistance
ratio as calculated by the pacer.
When assisting the garbage collector, a mutator goroutine will go
beyond paying off its allocation debt. It will build up extra credit
to amortize the overhead of the assist.
In fast-allocating applications with high assist ratios, building up
this credit can take the affected goroutine's entire time slice.
Reduce the penalty on each goroutine being selected to assist the GC
in two ways, to spread the responsibility more evenly.
First, do a consistent amount of extra scan work without regard for
the pacer's assistance ratio. Second, reduce the magnitude of the
extra scan work so it can be completed within a few hundred
microseconds.
Commentary on gcOverAssistWork is by Austin Clements, originally in
https://golang.org/cl/24704
Updates #14812Fixes#16432
Change-Id: I436f899e778c20daa314f3e9f0e2a1bbd53b43e1
Reviewed-on: https://go-review.googlesource.com/25155
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
Instead of comparing the address of the end of the memory to zero/copy,
comparing the address of the last element, which is a valid pointer.
Also unify large and unaligned Zero/Move, by passing alignment as AuxInt.
Fixes#16515 for ARM.
Change-Id: I19a62b31c5acf5c55c16a89bea1039c926dc91e5
Reviewed-on: https://go-review.googlesource.com/25300
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Support the following:
- Shifts. ARM64 machine instructions only use lowest 6 bits of the
shift (i.e. mod 64). Use conditional selection instruction to
ensure Go semantics.
- Zero/Move. Alignment is ensured.
- Hmul, Avg64u, Sqrt.
- reserve R18 (platform register in ARM64 ABI) and R29 (frame pointer
in ARM64 ABI).
Everything compiles, all.bash passed (with non-SSA test disabled).
Change-Id: Ia8ed58dae5cbc001946f0b889357b258655078b1
Reviewed-on: https://go-review.googlesource.com/25290
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
https://golang.org/cl/25233 was detecting the OS X release at compile
time, not run time. Detect it at run time instead.
Fixes#16473 (again)
Change-Id: I6bec4996e57aa50c52599c165aa6f1fae7423fa7
Reviewed-on: https://go-review.googlesource.com/25281
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
Updates x/net/http2 to git rev 6a513af for:
http2: return flow control for closed streams
https://golang.org/cl/25231
http2: make Transport prefer HTTP response header recv before body write error
https://golang.org/cl/24984
http2: make Transport treat "Connection: close" the same as Request.Close
https://golang.org/cl/24982Fixesgolang/go#16481
Change-Id: Iaddb166387ca2df1cfbbf09a166f8605578bec49
Reviewed-on: https://go-review.googlesource.com/25282
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Currently the pprof package gives almost no guidance for how to use it
and, despite the standard boilerplate used to create CPU and memory
profiles, this boilerplate appears nowhere in the pprof documentation.
Update the pprof package documentation to give the standard
boilerplate in a form people can copy, paste, and tweak. This
boilerplate is based on rsc's 2011 blog post on profiling Go programs
at https://blog.golang.org/profiling-go-programs, which is where I
always go when I need to copy-paste the boilerplate.
Change-Id: I74021e494ea4dcc6b56d6fb5e59829ad4bb7b0be
Reviewed-on: https://go-review.googlesource.com/25182
Reviewed-by: Rick Hudson <rlh@golang.org>
Conservative fix for the OS X 10.8 crash. We can unify them back together
during the Go 1.8 dev cycle.
Fixes#16473
Change-Id: If07228deb2be36093dd324b3b3bcb31c23a95035
Reviewed-on: https://go-review.googlesource.com/25233
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Added support for ClosureCall, DeferCall, InterCall
(GoCall not yet tested).
Added support for GetClosurePtr, IsNonNil, IsInBounds, IsSliceInBounds, NilCheck
(Convert and GetG not yet tested)
Still need to implement NilCheck optimizations.
Fixed move boolean constant, order of operands to subtract.
Updates #16010.
Change-Id: Ibe0f6a6e688df4396cd77de0e9095997e4ca8ed2
Reviewed-on: https://go-review.googlesource.com/25241
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Adds a test case for calling context.WithDeadline() where the deadline
exists in the past. This change increases the code coverage of the
context package.
Change-Id: Ib486bf6157e779fafd9dab2b7364cdb5a06be36e
Reviewed-on: https://go-review.googlesource.com/25007
Reviewed-by: Sameer Ajmani <sameer@golang.org>
Run-TryBot: Sameer Ajmani <sameer@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
From at least Go 1.4 to Go 1.6, Transport.RoundTrip would return the
error value from net.Conn.Read directly when the initial Read (1 byte
Peek) failed while reading the HTTP response, if a request was
outstanding. While never a documented or tested promise, Go 1.7 changed the
behavior (starting at https://golang.org/cl/23160).
This restores the old behavior and adds a test (but no documentation
promises yet) while keeping the fix for spammy logging reported in #15446.
This looks larger than it is: it just changes errServerClosedConn from
a variable to a type, where the type preserves the underlying
net.Conn.Read error, for unwrapping later in Transport.RoundTrip.
Fixes#16465
Change-Id: I6fa018991221e93c0cfe3e4129cb168fbd98bd27
Reviewed-on: https://go-review.googlesource.com/25153
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Because PPC lacks store-immediate, remove the instruction
that implies that it exists. Replace it with storezero for
the special case of storing zero, because R0 is reserved zero
for Go (though the assembler knows this, do it in SSA).
Also added address folding for storezero.
(Now corrected to use right-sized stores in bulk-zero code.)
Hello.go now compiles to
genssa main
00000 (...hello.go:7) TEXT "".main(SB), $0
00001 (...hello.go:7) FUNCDATA $0, "".gcargs·0(SB)
00002 (...hello.go:7) FUNCDATA $1, "".gclocals·1(SB)
v23 00003 (...hello.go:8) MOVD $go.string."Hello, World!\n"(SB), R3
v11 00004 (...hello.go:8) MOVD R3, 32(R1)
v22 00005 (...hello.go:8) MOVD $14, R3
v6 00006 (...hello.go:8) MOVD R3, 40(R1)
v20 00007 (...hello.go:8) MOVD R0, 48(R1)
v18 00008 (...hello.go:8) MOVD R0, 56(R1)
v9 00009 (...hello.go:8) MOVD R0, 64(R1)
v10 00010 (...hello.go:8) CALL fmt.Printf(SB)
b2 00011 (...hello.go:9) RET
00012 (<unknown line number>) END
Updates #16010
Change-Id: I33cfd98c21a1617502260ac753fa8cad68c8d85a
Reviewed-on: https://go-review.googlesource.com/25151
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Mostly copied from ARM port, with instruction names and Prog fields
adjusted, and 64-bit int ops added. Not complete.
Fib compiles and runs correctly.
Change-Id: Id3ecb0d4b571200a035344b3e8e4408769f76221
Reviewed-on: https://go-review.googlesource.com/25130
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Noticed when investigating a separate issue.
No external bug report or repro yet.
Change-Id: I8a1641a43163f22b09accd3beb25dd9e2a68a238
Reviewed-on: https://go-review.googlesource.com/25152
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
GOARCH=386 SSATEST=1 ./all.bash passes
Caveat: still needs changes to test/ files to use *_ssa.go versions. I
won't check those changes in with this CL because the builders will
complain as they don't have SSATEST=1.
Mostly minor fixes.
Implement float <-> uint32 in assembly. It seems the simplest option
for now.
GO386=387 does not work. That's why I can't make SSA the default for
386 yet.
Change-Id: Ic4d4402104d32bcfb1fd612f5bb6539f9acb8ae0
Reviewed-on: https://go-review.googlesource.com/25119
Reviewed-by: Cherry Zhang <cherryyz@google.com>
For register-register move, if there is only one use, allocate it in
the same register so we don't need to emit an instruction.
Updates #15365.
Change-Id: Iad41843854a506c521d577ad93fcbe73e8de8065
Reviewed-on: https://go-review.googlesource.com/25059
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This is:
(1) a simple trick that cuts the number of phi-nodes
(temporarily) inserted into the ssa representation by a factor
of 10, and can cut the user time to compile tricky inputs like
gogo/protobuf tests from 13 user minutes to 9.5, and memory
allocation from 3.4GB to 2.4GB.
(2) a fix to sparse lookup, that does not rely on
an assumption proven false by at least one pathological
input "etldlen".
These two changes fix unrelated compiler performance bugs,
both necessary to obtain good performance compiling etldlen.
Without them it takes 20 minutes or longer, with them it
completes in 2 minutes, without a gigantic memory footprint.
Updates #16407
Change-Id: Iaa8aaa8c706858b3d49de1c4865a7fd79e6f4ff7
Reviewed-on: https://go-review.googlesource.com/23136
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
entry:
x = MOVQconst [7]
...
b1:
goto b2
b2:
v = Phi(x, y, z)
Transform that program to:
entry:
...
b1:
x = MOVQconst [7]
goto b2
b2:
v = Phi(x, y, z)
This CL moves constant-generating instructions used by a phi to the
appropriate immediate predecessor of the phi's block.
We used to put all constants in the entry block. Unfortunately, in
large functions we have lots of constants at the start of the
function, all of which are used by lots of phis throughout the
function. This leads to the constants being live through most of the
function (especially if there is an outer loop). That's an O(n^2)
problem.
Note that most of the non-phi uses of constants have already been
folded into instructions (ADDQconst, MOVQstoreconst, etc.).
This CL may be generally useful for other instances of compiler
slowness, I'll have to check. It may cause some programs to run
slower, but probably not by much, as rematerializeable values like
these constants are allocated late (not at their originally scheduled
location) anyway.
This CL is definitely a minimal change that can be considered for 1.7.
We probably want to do a better job in the tighten pass generally, not
just for phi args. Leaving that for 1.8.
Update #16407
Change-Id: If112a8883b4ef172b2f37dea13e44bda9346c342
Reviewed-on: https://go-review.googlesource.com/25046
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
The omission of this instruction could confuse the traceback code if a
SIGPROF occurred during a signal handler. The traceback code would
trace up to sigtramp, but would then get confused because it would see a
PC address that did not appear to be in the function.
Fixes#16453.
Change-Id: I2b3d53e0b272fb01d9c2cb8add22bad879d3eebc
Reviewed-on: https://go-review.googlesource.com/25104
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Most operations need an upper bound on the physical page size, which
is what sys.PhysPageSize is for (this is checked at runtime init on
Linux). However, a few operations need a *lower* bound on the physical
page size. Introduce a "minPhysPageSize" constant to act as this lower
bound and use it where it makes sense:
1) In addrspace_free, we have to query each page in the given range.
Currently we increment by the upper bound on the physical page
size, which means we may skip over pages if the true size is
smaller. Worse, we currently pass a result buffer that only has
enough room for one page. If there are actually multiple pages in
the range passed to mincore, the kernel will overflow this buffer.
Fix these problems by incrementing by the lower-bound on the
physical page size and by passing "1" for the length, which the
kernel will round up to the true physical page size.
2) In the write barrier, the bad pointer check tests for pointers to
the first physical page, which are presumably small integers
masquerading as pointers. However, if physical pages are smaller
than we think, we may have legitimate pointers below
sys.PhysPageSize. Hence, use minPhysPageSize for this test since
pointers should never fall below that.
In particular, this applies to ARM64 and MIPS. The runtime is
configured to use 64kB pages on ARM64, but by default Linux uses 4kB
pages. Similarly, the runtime assumes 16kB pages on MIPS, but both 4kB
and 16kB kernel configurations are common. This also applies to ARM on
systems where the runtime is recompiled to deal with a larger page
size. It is also a step toward making the runtime use only a
dynamically-queried page size.
Change-Id: I1fdfd18f6e7cbca170cc100354b9faa22fde8a69
Reviewed-on: https://go-review.googlesource.com/25020
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Austin Clements <austin@google.com>
