We're about to require that all uses of trace.lock be on the system
stack. That's mostly easy, except that it's involving parking the
trace reader. Fix this by changing that parking protocol so it instead
synchronizes through an atomic.
For #53979.
Change-Id: Icd6db8678dd01094029d7ad1c612029f571b4cbb
Reviewed-on: https://go-review.googlesource.com/c/go/+/418955
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Austin Clements <austin@google.com>
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Writing out the trace footer currently manages trace buffers
differently from the rest of trace code. Rearrange it so it looks like
the rest of the code. In particular, we now write the frequency event
out to the trace buffer rather than returning it in a special byte
slice, and (*traceStackTable).dump threads a traceBufPtr like most
other functions that write to the trace buffers.
Change-Id: I3d0e108e56df884e7bd19823310dfbc0e21af9a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/422974
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Austin Clements <austin@google.com>
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Following up on the previous CL, this CL removes a unnecessary stack
copy of a large object in a range loop. This drops another 64 KiB from
(*traceStackTable).dump's stack frame so it is now roughly 80 bytes
depending on architecture, which will easily fit on the system stack.
For #53979.
Change-Id: I16f642f6f1982d0ed0a62371bf2e19379e5870eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/422955
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
Currently, the stack frame of (*traceStackTable).dump is 68KiB. We're
about to move (*traceStackTable).dump to the system stack, where we
often don't have this much room.
5140 bytes of this is an on-stack temporary buffer for constructing
potentially large trace events before copying these out to the actual
trace buffer.
Reduce the stack frame size by writing these events directly to the
trace buffer rather than temporary space. This introduces a couple
complications:
- The trace event starts with a varint encoding the event payload's
length in bytes. These events are large and somewhat complicated, so
it's hard to know the size ahead of time. That's not a problem with
the temporary buffer because we can just construct the event and see
how long it is. In order to support writing directly to the trace
buffer, we reserve enough bytes for a maximum size varint and add
support for populating a reserved space after the fact.
- Emitting a stack event calls traceFrameForPC, which can itself emit
string events. If these were emitted in the middle of the stack
event, it would corrupt the stream. We already allocate a []Frame to
convert the PC slice to frames, and then convert each Frame into a
traceFrame with trace string IDs, so we address this by combining
these two steps into one so that all trace string events are emitted
before we start constructing the stack event.
For #53979.
Change-Id: Ie60704be95199559c426b551f8e119b14e06ddac
Reviewed-on: https://go-review.googlesource.com/c/go/+/422954
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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In go.dev/cl/413396, I implemented implicit conversions by setting the
conversion's position to the enclosing statement that necessitated the
conversion. However, users actually want the position information to
be at the expression itself, and this seems sensible anyway.
This was noticed because x/tools had a test for:
fmt.Println(42)
and it was checking where the escape analysis diagnostic for
`42` (really `any(42)`) was reported.
Historically, we reported the column of the `4`; but CL 413396 caused
unified IR to instead report the column of the `(` instead (the
position associated with the call expression, which forced `42` to be
implicitly converted from `int` to `any`).
I chalk this mistake up to being accustomed to working with ir, where
we can't reliably use n.Pos() because of how ONAME positions work, so
I was trying to avoid relying on the implicitly converted expression's
own position.
Change-Id: I762076af6f65ebe6d444d64630722a5016dc2698
Reviewed-on: https://go-review.googlesource.com/c/go/+/422976
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Broken out of debug/pe. Update debug/pe to use it.
For #47653
Change-Id: Ib3037ee04073e005c4b435d0128b8437a075b00a
Reviewed-on: https://go-review.googlesource.com/c/go/+/408678
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dan Kortschak <dan@kortschak.io>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Ian Lance Taylor <iant@google.com>
Version 2022b was released on 2022-08-10 and we can start using it.
Its release announcement was
https://mm.icann.org/pipermail/tz-announce/2022-August/000071.html.
For #22487.
Change-Id: I0ec68968d82561da566f945608bfacb3c8b0e958
Reviewed-on: https://go-review.googlesource.com/c/go/+/422875
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
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For selector expression "x.M" where "M" is a promoted method, irgen is using
the type of receiver "x" for determining the typeparams for instantiation.
However, because M is a promoted method, so its associated receiver is
not "x", but "x.T" where "T" is the embedded field of "x". That casues a
mismatch when converting non-shape types arguments.
Fixing it by using the actual receiver which has the method, instead of
using the base receiver.
Fixes#53982
Change-Id: I1836fc422d734df14e9e6664d4bd014503960bfc
Reviewed-on: https://go-review.googlesource.com/c/go/+/419294
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Reviewed-by: Keith Randall <khr@google.com>
When making the recursive call to fprint,
we just need to know how many bytes were written
and whether multiple lines were written.
We don't need a buffer to accomplish those;
a custom writer can keep track of the two in a cheap way,
avoiding the allocation of a byte slice and copying bytes.
name old time/op new time/op delta
Print-16 6.28ms ± 2% 6.12ms ± 1% -2.50% (p=0.000 n=10+9)
name old speed new speed delta
Print-16 8.26MB/s ± 3% 8.47MB/s ± 1% +2.56% (p=0.000 n=10+9)
name old alloc/op new alloc/op delta
Print-16 483kB ± 0% 443kB ± 0% -8.20% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Print-16 17.8k ± 0% 17.3k ± 0% -2.31% (p=0.000 n=9+10)
Change-Id: Ib8411ae6738a2acae6af6d185da71727ce2eb97a
Reviewed-on: https://go-review.googlesource.com/c/go/+/412555
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
The comment claims that reflect users cannot obtain an unsafe.Pointer
without also importing the unsafe package explicitly.
This is no longer true now that the Value.UnsafePointer method
directly returns an unsafe.Pointer.
Change-Id: Ia5bf2e8aead681c8fac5b011129954d075ae5a43
Reviewed-on: https://go-review.googlesource.com/c/go/+/404396
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Using build tool tags instead of relying on GOAMD64 env, which can be
overriden at make.bash time.
Change-Id: I96bb4b7416ea0bd1ab552feec9ede45b89a584c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/422614
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
When trampolines are needed (e.g. Darwin ARM64), the DWARF LPT (Line
Program Table - see DWARF section 6.1) generation fails because the
replacement symbols are marked as external symbols and skipped during
the DWARF LPT generation phase.
Fixes#54320
Change-Id: I6c93f5378f50e5edf30d5121402a48214abb1ce2
GitHub-Last-Rev: 085bbc55db
GitHub-Pull-Request: golang/go#54321
Reviewed-on: https://go-review.googlesource.com/c/go/+/422154
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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Change the type of Conn.handshakeStatus from an atomically
accessed uint32 to an atomic.Bool. Change its name to
Conn.isHandshakeComplete to indicate it is a boolean value.
Eliminate the handshakeComplete() helper function, which checks
for equality with 1, in favor of the simpler
c.isHandshakeComplete.Load().
Change-Id: I084c83956fff266e2145847e8645372bef6ae9df
Reviewed-on: https://go-review.googlesource.com/c/go/+/422296
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
This CL adds a helper expression code for receiver addressing; i.e.,
the implicit addressing, dereferencing, and field selections involved
in changing the `x` in `x.M()` into an appropriate expression to pass
as an argument to the method.
Change-Id: I9be933e2a38c8f94f6a85d95b54f34164e5efb0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/421820
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Unified IR uses static dictionaries for some itabs and function/method
expressions, and they're roughly the right idea. But at the same time,
they're actually somewhat brittle and I need to reorganize some ideas
anyway to get shaped-based stenciling working. So this CL just rips
them out entirely.
Note: the code for emitting runtime dictionaries with *runtime._type
symbols is still present, and continues to demonstrate that basic
runtime dictionary handling is working.
Change-Id: I44eb1c7974fb397909ad5db12987659e7505c2ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/421819
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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This CL separates out the handling of selector expressions for field
values, method values, and method expressions. Again part of
refactoring to make it possible to access runtime dictionaries where
needed.
No behavioral change; just duplicating and then streamlining the
existing code paths.
Change-Id: I53b2a344f4bdba2c9f37ef370dc9a091a3941021
Reviewed-on: https://go-review.googlesource.com/c/go/+/421818
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Keith Randall <khr@google.com>
This CL changes unified IR to explicitly handle function
instantiations within expression handling, rather than leaving it to
the underlying object reading logic.
Change-Id: I009a56013fbe9fbc4dabf80eea98993d34af4272
Reviewed-on: https://go-review.googlesource.com/c/go/+/421817
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Reviewed-by: David Chase <drchase@google.com>
There was a TODO about quadratic performance, and indeed,
it can get bad. Added a map, made some integers that are
unlikely to exceed a few million into 32-bit integers.
Change-Id: I6facf2eabc00483e943b326ca8dcae2f778093da
Reviewed-on: https://go-review.googlesource.com/c/go/+/422297
Run-TryBot: David Chase <drchase@google.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Those ureader.go files have enough documents and in stable
developement/review as other parts of Unified IR.
Fixes#48194
Change-Id: I08a0cbfef05401135b5390e00fe808e838a96170
Reviewed-on: https://go-review.googlesource.com/c/go/+/422617
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Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
I've needed this more than once in the past, I hack it in,
then throw it away, seems sensible to make the change and
save it.
Fixes#53937.
Change-Id: I7fe886b1c93d73cbf553bed587f2c30f0f5d5a0b
Reviewed-on: https://go-review.googlesource.com/c/go/+/418015
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
The SERVER_NAME variable in the CGI environment should not
contain the port, according to the section 4.1.14 of the
RFC 3875.
Fixes#53368.
Change-Id: Ifeea70206878cf83bc0bda35cb514d0226bbcd8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/412434
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Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
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The test passed on linux/arm64, so re-enable it.
Change-Id: Ib5252d89b58f0de256993065e27b64c4676f5103
Reviewed-on: https://go-review.googlesource.com/c/go/+/414975
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Eric Fang <eric.fang@arm.com>
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For signed comparisons, the following four optimization rules hold:
(CMPconst [0] z:(AND x y)) && z.Uses == 1 => (TST x y)
(CMPWconst [0] z:(AND x y)) && z.Uses == 1 => (TSTW x y)
(CMPconst [0] x:(ANDconst [c] y)) && x.Uses == 1 => (TSTconst [c] y)
(CMPWconst [0] x:(ANDconst [c] y)) && x.Uses == 1 => (TSTWconst [int32(c)] y)
But currently they only apply to jump instructions, not to conditional
instructions within a block, such as cset, csel, etc. This CL extends
the above rules into blocks so that conditional instructions can also be
optimized.
name old time/op new time/op delta
DivisiblePow2constI64-160 1.04ns ± 0% 0.86ns ± 0% -17.30% (p=0.008 n=5+5)
DivisiblePow2constI32-160 1.04ns ± 0% 0.87ns ± 0% -16.16% (p=0.016 n=4+5)
DivisiblePow2constI16-160 1.04ns ± 0% 0.87ns ± 0% -16.03% (p=0.008 n=5+5)
DivisiblePow2constI8-160 1.04ns ± 0% 0.86ns ± 0% -17.15% (p=0.008 n=5+5)
Change-Id: I6bc34bff30862210e8dd001e0340b8fe502fe3de
Reviewed-on: https://go-review.googlesource.com/c/go/+/420434
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When a generic interface method is used, we use a special
relocation R_USEGENERICIFACEMETHOD to tell the linker the name of
the generic interface method, so it can keep methods with that
name live. The relocation references a symbol whose content is the
name. Currently this is a string symbol, which is content
addessable and may have trailing zero bytes (for better
deduplication). The trailing bytes can cause confusion for the
linker. This symbol doesn't need to be in the final binary and
doesn't need to be deduplicated with other symbol. So we don't use
content addressable symbol but make an (unnamed) symbol
specifically for this.
May fix#54346.
Change-Id: If0c34f7844c3553a7be3846b66cf1c103bc231c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/422300
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Add new line at the end of crash_test.go.
Change-Id: I73c77666066b105e563215f34e7ede6c1d92226b
Reviewed-on: https://go-review.googlesource.com/c/go/+/422299
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
We claim to not maintain pointer bits for noscan objects. But in fact
we do, since whenever we switch a page from scannable to noscan, we
call heapBits.initSpan which zeroes the heap bits.
Switch to ensure that we never scan noscan objects. This ensures that
we don't depend on the ptrbits for noscan objects. That fixes a bug
in the 1-bit bitmap CL which depended on that fact.
Change-Id: I4e66f582605b53732f8fca310c1f6bd2892963cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/422435
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Replace loading and storing an atomic.Value of type pointer with
atomic.Pointer.
Change-Id: I018ac1e18eee4f203ebca65c2833daf991075371
Reviewed-on: https://go-review.googlesource.com/c/go/+/422174
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Reviewed-by: Rob Pike <r@golang.org>
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Updates github.com/google/pprof to bring in the commit from
https://github.com/google/pprof/pull/717 which fixes mangled
symbol names for type parameters.
Fixes#54105
Change-Id: I01af9f780aba3338b960a03b30906a23642e4448
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Consistently recommend using EscapedPath rather than RawPath directly.
For #33596.
Change-Id: Ibe5c2dfa7fe6b1fbc540efed6db1291fc6532726
Reviewed-on: https://go-review.googlesource.com/c/go/+/418035
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Change-Id: Ia8c67d148fc7e71cac8954ccce6fffb8a6f423df
GitHub-Last-Rev: 9441b8f0c5
GitHub-Pull-Request: golang/go#54036
Reviewed-on: https://go-review.googlesource.com/c/go/+/419322
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Per TODO, this CL just moves code around without behavioral
change. Part of a cleanup process so that it's easier to access object
dictionaries where needed.
Change-Id: I95bb3cdd3cdb46cae47d76d5c1d5d8256661f222
Reviewed-on: https://go-review.googlesource.com/c/go/+/421816
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For interface method values, we nil check the receiver value at the
point of evaluating the method value. Currently this is inserted by
the backend during walk, but in some cases it's useful to emit them
upfront instead.
OITAB is essentially a field selection operation, like ODOT, OIDATA,
and OSPTR.
OCHECKNIL is a statement that simply evaluates its unary operand, and
discards the result (after testing for nil).
Change-Id: I583b5170539caa9a87aec661d5c293080fd87fbb
Reviewed-on: https://go-review.googlesource.com/c/go/+/422197
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ir.ClosureExpr implements ir.InitNode, so ir.InitExpr can prepend init
statements to it. However, CalleeEffects wasn't aware of this and
could cause the init statements to get dropped when inlining a call to
a closure.
This isn't an issue today, because we don't create closures with init
statements. But I ran into this within unified IR.
Easy and robust solution: just take advantage that ir.TakeInit can
handle any node.
Change-Id: Ica05fbf6a8c5be4b11927daf84491a1140da5431
Reviewed-on: https://go-review.googlesource.com/c/go/+/422196
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NewClosureVar should only be called to capture locally declared
variables in the enclosing function scope. This CL adds a check to
make sure it's used that way, in particular to make sure it's not
called to capture global variables.
This came up because for generic method values, we desugar the method
value into a function literal that captures the receiver value after
evaluating it. However, due to compiler backend limitations, for
package-scope generic method values we spill the receiver value into a
global variable rather than capturing it normally.
To prevent confusing backend issues when misusing NewClosureVar with
global variables, this CL adds an extra check.
Change-Id: I80f0f083dc80f70c7f0298020efe56dba00b67d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/422195
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When debugging IR that uses OLINKSYMOFFSET, you really need to know
what linksym it actually refers to.
Change-Id: I7f4775d040b50e36262f9f8b52d0fb112b7ed350
Reviewed-on: https://go-review.googlesource.com/c/go/+/422194
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This reverts commit b589208c8c.
Reason for revert: Bug somewhere in this code, causing wasm and maybe linux/386 to fail.
Change-Id: I5e1e501d839584e0219271bb937e94348f83c11f
Reviewed-on: https://go-review.googlesource.com/c/go/+/422395
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This reverts commit c3833a5543.
Reason for revert: Bug somewhere in this code, causing wasm and maybe linux/386 to fail.
Change-Id: I05f7cfa467598ca0c2c84fd4f752cc4ef117cc51
Reviewed-on: https://go-review.googlesource.com/c/go/+/422394
Run-TryBot: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Skip a collection of -buildmode=pie tests on alpine, which are
currently failing on the linux-amd64-alpine builder. Once #54354 has
been investigated and resolved we can turn these tests back on.
Updates #54354.
Change-Id: I99d4016a40873ee6bb4eda571a64eddbe719c76a
Reviewed-on: https://go-review.googlesource.com/c/go/+/422295
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Change-Id: Iff881cc6cc2ec34c7cf8bbd5dd1b0a05a19e1c23
Reviewed-on: https://go-review.googlesource.com/c/go/+/422175
Run-TryBot: Rob Pike <r@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Add named constants for the 3rd, 4th, and 13th most popular formats.
Fixes#52746
Change-Id: I7ce92e44dcae18c089124f1d6f5bc2d6359d436c
Reviewed-on: https://go-review.googlesource.com/c/go/+/412495
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
Disable the TestGdb* testpoints until we can figure out why they are
failing and reconfigure the machine properly.
Updates #54352.
Change-Id: Id9c76a0ba6e23b5deff24f521a1c8e0aafb6481a
Reviewed-on: https://go-review.googlesource.com/c/go/+/422294
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
