Instead of using two relocation types R_XXX and R_WEAKXXX, use a
separate bit, R_WEAK, to mark weak relocations. This makes it
easier to add more weak relocation types.
Change-Id: Iec4195c2aefa65f59e464c83018246e17cd08173
Reviewed-on: https://go-review.googlesource.com/c/go/+/268478
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
When writing code that reflects over a struct type, it's a common requirement to know the full set of struct fields, including fields available due to embedding of anonymous members while excluding fields that are erased because they're at the same level as another field with the same name.
The logic to do this is not that complex, but it's a little subtle and easy to get wrong.
This CL adds a new `VisibleFields` function to the reflect package that returns the full set of effective fields that apply in a given struct type.
Performance isn't a prime consideration, as it's common to cache results by type.
Fixes#42782
Change-Id: I7f1af76cecff9b8a2490f17eec058826e396f660
Reviewed-on: https://go-review.googlesource.com/c/go/+/281233
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Daniel Martí <mvdan@mvdan.cc>
Currently, relocation type is stored as uint8 in object files, as
Go relocations do not exceed 255. In the linker, however, it is
used as a 16-bit type, because external relocations can exceed
255. The linker has to store the extra byte in a side table. This
complicates many things.
Just store it as uint16 in object files. This simplifies things,
with a small cost of increasing the object file sizes.
before after
hello.o 1672 1678
runtime.a 7927784 8056194
Change-Id: I313cf44ad0b8b3b76e35055ae55d911ff35e3158
Reviewed-on: https://go-review.googlesource.com/c/go/+/268477
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Currently, the compiler synthesize a special ".fp" node, which
points to the FP of the current frame, be to used to call
gorecover. Later that node turns to an Arg in SSA that is not
really an arg, causing problems for the new ABI work which changes
the handling of Args, so we have to special-case that node.
This CL changes the compiler to get the FP by using getcallersp,
which is an intrinsic in SSA and works on all platforms. As we
need the FP, not the caller SP, one drawback is that we have to
add FixedFrameSize for LR machines. But it does allow us to remove
that special node.
Change-Id: Ie721d51efca8116c9d23cc4f79738fffcf847df8
Reviewed-on: https://go-review.googlesource.com/c/go/+/297930
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
Currently, when instrumenting for the race detector, the compiler
inserts racefuncentry/racefuncentryfp at the entry of instrumented
functions. racefuncentry takes the caller's PC. On AMD64, we synthesize
a node which points to -8(FP) which is where the return address is
stored. Later this node turns to a special Arg in SSA that is not
really an argument. This causes problems in the new ABI work so that
special node has to be special-cased.
This CL changes the special node to a call to getcallerpc, which lowers
to an intrinsic in SSA. This also unifies AMD64 code path and LR machine
code path, as getcallerpc works on all platforms.
Change-Id: I1377e140b91e0473cfcadfda221f26870c1b124d
Reviewed-on: https://go-review.googlesource.com/c/go/+/297929
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
CL 280456 introduced a new store combining rule. On the LHS some
of the Aux and AuxInt of the stores are not specified, therefore
ignored during the matching. The rule is only correct if they
match. This CL adds explict match.
TODO: maybe we want the rule matcher require Aux/AuxInt to be
always specified on the LHS (using _ to explicitly ignore)? Or
maybe we want it to match the zero value if not specified? The
current approach is error-prone.
Fixes#44823.
Change-Id: Ic12b4a0de63117f2f070039737f0c905f28561bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/299289
Trust: Cherry Zhang <cherryyz@google.com>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Correctly accessing allgs is a bit hairy. Some paths need to lock
allglock, some don't. Those that don't are safest using atomicAllG, but
usage is not consistent.
Rather than doing this ad-hoc, move all access* through forEachG /
forEachGRace, the locking and atomic versions, respectively. This will
make it easier to ensure safe access.
* markroot is the only exception, as it has a far-removed guarantee of
safe access via an atomic load of allglen far before actual use.
Change-Id: Ie1c7a8243e155ae2b4bc3143577380c695680e89
Reviewed-on: https://go-review.googlesource.com/c/go/+/279994
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Previously, if you attempted to fetch a private repository, or your
Git/curl client failed for an unknown reason, codehost would return an
UnknownRevisionError, which reported that a given revision in go.mod
was "unknown". This is confusing to many users who can go look in
their browser for example and see that the commit-ish exists.
Instead check whether "git ls-remote" exited with an error, and if so,
return that instead of the UnknownRevision message.
Fixes#42751.
Change-Id: I0dbded878b2818280e61126a4493767d719ad577
Reviewed-on: https://go-review.googlesource.com/c/go/+/297950
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Invalid constant was already reported by noder, so don't re-check in
typecheck, which lead to compiler crashing.
Updates #43311
Change-Id: I48e2f540601cef725c1ff628c066ed15d848e771
Reviewed-on: https://go-review.googlesource.com/c/go/+/298713
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Same as CL 294031, but for OTYPESW.
Updates #43311
Change-Id: I996f5938835baff1d830c17ed75652315106bdfd
Reviewed-on: https://go-review.googlesource.com/c/go/+/298712
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The invalid interface type will be reported already, so don't expand
that invalid one, which causes the compiler crashes.
Updates #43311
Change-Id: Ic335cfa74f0b9fcfd0929dc5fd31d9156a8f5f5c
Reviewed-on: https://go-review.googlesource.com/c/go/+/298710
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
CheckReturn uses fn.Type() unconditionally, so for invalid function,
fn.Type() will be nil, causes the compiler crashes.
Updates #43311
Change-Id: I4420dd296c72ea83986b38fbf2c7f51fa59757c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/298709
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Now that allglock is no longer taken in throw, paniclk can move to the
bottom of the lock order where it belongs.
There is no fundamental reason that we really need to skip checks on
paniclk in lockWithRank (despite the recursive throws that could be
caused by lock rank checking, startpanic_m would still allow the crash
to complete). However, the partial order of lockRankPanic should be
every single lock that may be held before a throw, nil dereference,
out-of-bounds access, which our partial order doesn't cover.
Updates #42669
Change-Id: Ic3efaea873dc2dd9fd5b0d6ccdd5319730b29a22
Reviewed-on: https://go-review.googlesource.com/c/go/+/270862
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This change modifies the reflect ABI assignment algorithm to catch
zero-sized types at the top level of each argument and faux-stack-assign
them. It doesn't actually generate an ABI step, which is unnecessary,
but it ensures that the offsets of further stack-assigned arguments are
aligned to the alignment of that zero-sized argument.
This change is necessary to have the register ABI assignment algorithm
gracefully degrade to ABI0 when no registers are present in the ABI.
Fixes#44377.
Change-Id: Ia95571688a61259302bb3c6d5fb33fbb6b5e8db8
Reviewed-on: https://go-review.googlesource.com/c/go/+/293789
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Than McIntosh <thanm@google.com>
This change switches reflect to use global variables for ABI-related
register counts instead of internal/abi constants. The advantage of
doing so is that we can make the internal/abi constants non-zero and
enable the runtime register argument spiller/unspiller even if they're
not used. It's basically turning two things we need to flip when we
switch to the register ABI into one.
It also paves the way for testing the reflect register ABI path
independently, because now we can switch the global variables at will
and run the register-assignment algorithm in tests without having the
rest of the runtime be broken.
Change-Id: Ie23629a37a5c80aeb24909d4bd9eacbd3f0c06d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/293149
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Previously, if an extracted module directory existed in the module
cache, but the corresponding ziphash file did not, if the sum was
missing from go.sum, we would not verify the sum. This caused 'go get'
not to write missing sums. 'go build' in readonly mode (now the
default) checks for missing sums and doesn't attempt to fetch modules
that can't be verified against go.sum.
With this change, when requesting the module directory with
modfetch.DownloadDir, if the ziphash file is missing, the go command
will re-hash the zip without downloading or re-extracting it again.
Note that the go command creates the ziphash file before the module
directory, but another program could remove it separately, and it
might not be present after a crash.
Fixes#44749
Change-Id: I64551e048a3ba17d069de1ec123d5b8b2757543c
Reviewed-on: https://go-review.googlesource.com/c/go/+/298352
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Add a new method TB.Setenv that'll set environment variables
only for the isolated lifetime of the test, and will clean up
and unset these variables when the test ends.
This method disables the test or benchmark from running in
parallel.
Fixes#41260
Change-Id: I0a18f094ec1c6ec3157b4b12993ea3075e2e9867
GitHub-Last-Rev: 0ca12fa565
GitHub-Pull-Request: golang/go#41857
Reviewed-on: https://go-review.googlesource.com/c/go/+/260577
Trust: Daniel Martí <mvdan@mvdan.cc>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: roger peppe <rogpeppe@gmail.com>
Change-Id: I919d9c3968c0fcd33774e714f22182504790bd01
Reviewed-on: https://go-review.googlesource.com/c/go/+/284143
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Trust: Daniel Martí <mvdan@mvdan.cc>
Most subprocess invocations in the go command use base.AppendPWD to
append an accurate value of PWD to the command's environment, which can
speed up calls like os.Getwd and also help to provide less-confusing
output from scripts. Update `go generate` to do so.
Fixes#43862
Change-Id: I3b756f1532b2d922f7d74fd86414d5567a0122c0
GitHub-Last-Rev: 3ec8da265a
GitHub-Pull-Request: golang/go#43940
Reviewed-on: https://go-review.googlesource.com/c/go/+/287152
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Baokun Lee <bk@golangcn.org>
This test was missed in CL 298650, and not caught by TryBots because
it is skipped it short mode (and we forgot to add longtest TryBots on
that CL).
Updates #44745
Change-Id: I696d01307dabf351b0e4735db0644f4e09c8e369
Reviewed-on: https://go-review.googlesource.com/c/go/+/298794
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Map serialization using reflect.Value.MapIndex cannot retrieve
map keys that contain a NaN, resulting in a panic.
Switch the implementation to use the reflect.Value.MapRange method
instead, which iterates over all map entries regardless of whether
they are directly retrievable.
Note that according to RFC 8259, section 4, a JSON object should
have unique names, but does not forbid the occurrence of duplicate names.
Fixes#43207
Change-Id: If4bc55229b1f64b8ca4b0fed37549725efdace39
Reviewed-on: https://go-review.googlesource.com/c/go/+/278632
Trust: Meng Zhuo <mzh@golangcn.org>
Trust: Joe Tsai <thebrokentoaster@gmail.com>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Previously, we would sometimes see an internal (*instance) type for a
receiver of a types2 method, which was a bug. To deal with that, we put
in an extra (*Selection).TArgs() method. However, that (*instance) type
is no longer showing up for receivers, so we can remove the types2
method we added and do the work with existing types2 API methods.
Change-Id: I03e68f5bbaaf82fe706b6efecbb02e951bbd3cd4
Reviewed-on: https://go-review.googlesource.com/c/go/+/298869
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Dan Scales <danscales@google.com>
includes three tests
Change-Id: I33ac0cfe35085d4b6ad2775abcaa3d7d6527b49f
Reviewed-on: https://go-review.googlesource.com/c/go/+/297031
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
this caused a problem in write barrier code when a spurious
zero-offset prevented a write barrier elision.
removed cache after instrumenting it and discovering
zero safe hits (one value must dominate the other, else
unsafe).
Change-Id: I42dfdb4d38ebfe158b13e766a7fabfc514d773f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/297349
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
'go mod tidy' and 'go mod vendor' normally report errors when a
package can't be imported, even if the import appears in a file that
wouldn't be compiled by the current version of Go. These errors are
common for packages introduced in higher versions of Go, like "embed"
in 1.16.
This change causes 'go mod tidy' and 'go mod vendor' to ignore
missing package errors if the import path appears to come from the
standard library because it lacks a dot in the first path element.
Fixes#44557
Updates #27063
Change-Id: I61d6443e77ab95fd8c0d1514f57ef4c8885a77cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/298749
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
The new error message tells the user what was wrong (no go.mod found)
and directs them to 'go help modules', which links to tutorials.
Fixes#44745
Change-Id: I98f31fec4a8757eb1792b45491519da4c552cb0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/298650
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
types2 uses the syntax printer to print expressions (for tracing
or error messages), so we need to (at least) print type lists in
interfaces.
While at it, also implement the printing of type parameter lists.
Fixes#44766.
Change-Id: I36a4a7152d9bef7251af264b5c7890aca88d8dc3
Reviewed-on: https://go-review.googlesource.com/c/go/+/298549
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
It is not multithreaded-compilation-safe, and also seems
to cause problems on the noopt-builder.
Change-Id: I52dbcd507d256990f1ec7c8040ec7b76595aae4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/298850
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Added a test that exercises named results
Change-Id: Ie228b68f4f846266595a95e0f65a6e4b8bf79635
Reviewed-on: https://go-review.googlesource.com/c/go/+/297029
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
It turns out that the proc thread update function doesn't actually
allocate new memory for its arguments and instead just copies the
pointer values into the preallocated memory. Since we were allocating
that memory as []byte, the garbage collector didn't scan it for pointers
to Go allocations and freed them. We _could_ fix this by requiring that
all users of this use runtime.KeepAlive for everything they pass to the
update function, but that seems harder than necessary. Instead, we can
just do the allocation as []unsafe.Pointer, which means the GC can
operate as intended and not free these from beneath our feet. In order
to ensure this remains true, we also add a test for this.
Fixes#44662.
Change-Id: Ib392ba8ceacacec94b11379919c8179841cba29f
Reviewed-on: https://go-review.googlesource.com/c/go/+/297389
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
at least for ints and strings
includes simple test
For #40724.
Change-Id: Ib8484e5b957b08f961574a67cfd93d3d26551558
Reviewed-on: https://go-review.googlesource.com/c/go/+/295309
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This is a preparatory patch to support 6 arg opcodes on POWER10,
and simplify 5 arg opcode processing (e.g RLWNM and similar).
This expands the optab structure, and renames a4 arguments to a6.
No actual change in functionality is made.
Change-Id: I785e4177778e4bf1326cf8e46e8aeaaa0e4d406b
Reviewed-on: https://go-review.googlesource.com/c/go/+/295031
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Run-TryBot: Carlos Eduardo Seo <carlos.seo@linaro.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Keith Randall <khr@golang.org>
This test verifies the behavior of a test that fails due to timing
out. However, the test to be timed out was only sleeping for 1s before
returning successfully. That is empirically not always long enough for
the test process itself to detect the timeout and terminate.
We could replace the sleep with a select{}, but that would assume that
the deadlock detector does not terminate a test that reaches that
state (true today, but not necessarily so).
We could replace the arbitrarily sleep with an arbitrarily longer
sleep, but that's, well, arbitrary.
Instead, have the test sleep in an unbounded loop to ensure that it
always continues to run until the timeout is detected, and check the
test output to ensure that it actually reached the timeout path.
Fixes#32983
Change-Id: Ie7f210b36ef0cc0a4db473f780e15a3d6def8bda
Reviewed-on: https://go-review.googlesource.com/c/go/+/289889
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Noticed while debugging failing tests for #36460.
Fixes#44788
Change-Id: Ic2cf511d871b29284f7372920f6f7d452825dd63
Reviewed-on: https://go-review.googlesource.com/c/go/+/298651
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Change-Id: Ib44729ffb5d4d7b84114dcf028b7e0418c9d5035
GitHub-Last-Rev: 13f59a650a
GitHub-Pull-Request: golang/go#42434
Reviewed-on: https://go-review.googlesource.com/c/go/+/268021
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Martin Möhrmann <moehrmann@google.com>
Verified with test and with single step watching changes to register
values across morestack calls, after reload.
Also added stack-growth test with pointer parameters of varying lifetime.
For #40724.
Change-Id: Idb5fe27786ac5c6665a734d41e68d3d39de2f4da
Reviewed-on: https://go-review.googlesource.com/c/go/+/294429
Trust: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Morestack works for non-pointer register parameters
Within a function body, pointer-typed parameters are correctly
tracked.
Results still not hooked up.
For #40724.
Change-Id: Icaee0b51d0da54af983662d945d939b756088746
Reviewed-on: https://go-review.googlesource.com/c/go/+/294410
Trust: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
