This CL implements the remainder of the zero-copy string->[]byte
conversion optimization initially attempted in go.dev/cl/520395, but
fixes the tracking of mutations due to ODEREF/ODOTPTR assignments, and
adds more comprehensive tests that I should have included originally.
However, this CL also keeps it behind the -d=zerocopy flag. The next
CL will enable it by default (for easier rollback).
Updates #2205.
Change-Id: Ic330260099ead27fc00e2680a59c6ff23cb63c2b
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In order for decoding to faithfully reproduce the encoded input,
the symbols must be unique (i.e., provide a bijective mapping).
Thus, reject duplicate symbols in NewEncoding.
As a minor optimization, modify WithPadding to use the decodeMap
to quickly check whether the padding character is used in O(1)
instead of O(32) or O(64).
Change-Id: I5631f6ff9335c35d59d020dc0e307e3520786fbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/520335
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Change the internal constant enableInterfaceInference to a unifier
field that can be controlled dynamically and set it for Go 1.21
or later.
This restores Go 1.20 unification behavior for interfaces.
Fixes#61903.
Change-Id: Iefd6c0899811f8208a8be9cef2650a07787ae177
Reviewed-on: https://go-review.googlesource.com/c/go/+/519855
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This reverts CL 514715.
This will make it easier to make interface inference conditional
based on the current language version.
For #61903.
Change-Id: I07820c861d6ebfd04899e41eb4123f26af2da1ee
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Irrespective of whether unification is exact or inexact, method
signatures of interfaces must always match exactly: a type never
satisfies/implements an interface if relevant method signatures
are different (i.e., not identical, possibly after substitution).
This change matches the fix https://go.dev/cl/519435.
For #61879.
Change-Id: I28b0a32d32626d85afd32e107efce141235a923d
Reviewed-on: https://go-review.googlesource.com/c/go/+/519455
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The ssagen pass runs concurrently, so it's not safe to mutate global
variables like this.
Instead, turn it into a constant and add an assertion that the
constant has the correct value.
Fixes#62095.
Change-Id: Ia7f07e33582564892d194153ac3d8759429fc9ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/520598
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A 0 in phdr.p_align is the same as 1, meaning no alignment.
Fixes#62097
Change-Id: I931bab443fd6a89b5b45c8f99ead217f02e9b453
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This reverts CL 520395.
Reason for revert: thanm@ pointed out failure cases.
Change-Id: I3fd60b73118be3652be2c08b77ab39e793b42110
Reviewed-on: https://go-review.googlesource.com/c/go/+/520596
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This CL enables the latent support for string->[]byte conversions
added go.dev/cl/520259.
One catch is that we need to make sure []byte("") evaluates to a
non-nil slice, even if "" is (nil, 0). This CL addresses that by
adding a "ptr != nil" check for OSTR2BYTESTMP, unless the NonNil flag
is set.
The existing uses of OSTR2BYTESTMP (which aren't concerned about
[]byte("") evaluating to nil) are updated to set this flag.
Fixes#2205.
Change-Id: I35a9cb16c164cd86156b7560915aba5108d8b523
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This CL removes the extra complexity from escape analysis that was
only needed to support go/defer normalization. It does not affect
analysis results at all.
Change-Id: I75785e0cb4c4ce19bea3b8df0bf95821bd885291
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Currently, we rewrite:
go f(new(T))
into:
tmp := new(T)
go func() { f(tmp) }()
However, we can both shrink the closure and improve escape analysis by
instead rewriting it into:
go func() { f(new(T)) }()
This CL does that.
Change-Id: Iae16a476368da35123052ca9ff41c49159980458
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Normalizing go/defer statements to always use functions with zero
parameters and zero results was added to escape analysis, because that
was the earliest point at which all three frontends converged. Now
that we only have the unified frontend, we can do it during typecheck,
which is where we perform all other desugaring and normalization
rewrites.
Change-Id: Iebf7679b117fd78b1dffee2974bbf85ebc923b23
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I previously used a clumsy hack to copy Closgen back and forth while
inlining, to handle when an inlined function contains closures, which
need to each be uniquely numbered.
The real solution was to name the closures using r.inlCaller, rather
than r.curfn. This CL adds a helper method to do exactly this.
Change-Id: I510553b5d7a8f6581ea1d21604e834fd6338cb06
Reviewed-on: https://go-review.googlesource.com/c/go/+/520339
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This CL moves more common Func-setup logic into ir.NewFunc. In
particular, it now handles constructing the Name and wiring them
together, setting the Typecheck bit, and setting Sym.Func.
Relatedly, this CL also extends typecheck.DeclFunc to append the
function to typecheck.Target.Funcs, so that callers no longer need to
do this.
Change-Id: Ifa0aded8df0517188eb295d0dccc107af85f1e8a
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This CL extends ir.NewClosureFunc to take the signature type argument,
and to handle naming the closure and adding it to typecheck.Target.
It also removes the code for typechecking OCLOSURE and ODCLFUNC nodes,
by having them always constructed as typechecked. ODCLFUNC node
construction will be further simplified in the followup CL.
Change-Id: Iabde4557d33051ee470a3bc4fd49599490024cba
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Start making progress towards constructing IR with proper types.
Change-Id: Iad32c1cf60f30ceb8e07c31c8871b115570ac3bd
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In CL 421877 and CL 444278, time.Time.AppendFormat has been
specially optimized for the time.RFC3339Nano representation.
Relying on that optimization and modify the output to obtain the
fixed-width millisecond resolution that slog uses.
This both removes a lot of code and also improves performance:
name old time/op new time/op delta
WriteTime 93.0ns ± 1% 80.8ns ± 0% -13.17% (p=0.000 n=8+9)
Change-Id: I61e8f4476c111443e3e2098a45b2c21a76137345
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Change-Id: I71a38dd20bfaf2b1aed18892d54eeb017d3d7d66
GitHub-Last-Rev: 8da43b2cbd
GitHub-Pull-Request: golang/go#61955
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These aren't constructed by the unified frontend.
Change-Id: Ied87baa9656920bd11055464bc605933ff448e21
Reviewed-on: https://go-review.googlesource.com/c/go/+/520264
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This CL extends escape analysis in two ways.
First, we already optimize directly called closures. For example,
given:
var x int // already stack allocated today
p := func() *int { return &x }()
we don't need to move x to the heap, because we can statically track
where &x flows. This CL extends the same idea to work for indirectly
called closures too, as long as we know everywhere that they're
called. For example:
var x int // stack allocated after this CL
f := func() *int { return &x }
p := f()
This will allow a subsequent CL to move the generation of go/defer
wrappers earlier.
Second, this CL adds tracking to detect when pointer values flow to
the pointee operand of an indirect assignment statement (i.e., flows
to p in "*p = x") or to builtins that modify memory (append, copy,
clear). This isn't utilized in the current CL, but a subsequent CL
will make use of it to better optimize string->[]byte conversions.
Updates #2205.
Change-Id: I610f9c531e135129c947684833e288ce64406f35
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Change-Id: I52c9ed0c1a178f3ae3eb4f135d8f11018075fe3b
GitHub-Last-Rev: 407aa89c88
GitHub-Pull-Request: golang/go#62061
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A negative rune (other than NoPadding) makes no semantic sense.
Doing so relies on integer overflow of converting a rune to a byte
and would thus be equivalent to passing the positive byte value
of byte(padding).
This may cause existing code to panic.
An alternative is treat negative runes as equivalent to NoPadding.
However, the code already panics to report erroneous padding values,
so this is in line with the existing API.
Change-Id: I02499705519581598adc0c8525d90e25278dc056
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Rather than having PipeWriter and PipeReader a wrapper type on pipe,
make them have the same underlying memory representation and
rely instead of simply casting the same *pipe pointer
as either a *PipeReader or *PipeWriter to control the set of methods.
This reduces the number of allocations by 2,
going from a total of 6 down to 4 allocations.
Change-Id: I09207a00c4b7afb44c7773d752c5628a07e24fda
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Implement append-like equivalent of Encode and Decode functions.
Fixes#53693
Change-Id: I79d8d834e3c8f77fad32be2fd391e33d4d1527ea
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"buffer" call the receiver "b" in other method, don't call it "bp" in
another. Keep the same receiver names, as prescribed in Go Code Review
Comments (https://go.dev/s/style#receiver-names).
Change-Id: I9fafc799a9e4102419ed743b941bca74e908f5c0
GitHub-Last-Rev: c8b851d372
GitHub-Pull-Request: golang/go#62066
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go get golang.org/x/tools@74c255b # CL 519295
go mod tidy
go mod vendor
Pulling in the fix for unnecessary dependency on *types.StdSizes, which
is non guaranteed behavior.
Updates #61035
Change-Id: Ifb04bab060343b6a849980db6bb65da9889b4665
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This CL introduces a locAttr bitset type, which will make it easier to
add additional attributes in the near future.
Change-Id: I2689aa623097279dc1e7b7cf2adf5184d710c5a8
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I want to add more location properties (e.g., to track indirect stores
and calls), and it's easier to reason about them if they're all
consistent that "true" means more consequences than less.
Change-Id: I3f8674bb11877ba33082a0f5f7d8e55ad6d7a4cc
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Discarded values never persist, so they can be transiently allocated
too.
Change-Id: I036ce0c1eea45e437142497bb7df3ecb44b56e52
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The pprof mutex profile was meant to match the Google C++ (now Abseil)
mutex profiler, originally designed and implemented by Mike Burrows.
When we worked on the Go version, pjw and I missed that C++ counts the
time each thread is blocked, even if multiple threads are blocked on a
mutex. That is, if 100 threads are blocked on the same mutex for the
same 10ms, that still counts as 1000ms of contention in C++. In Go, to
date, /debug/pprof/mutex has counted that as only 10ms of contention.
If 100 goroutines are blocked on one mutex and only 1 goroutine is
blocked on another mutex, we probably do want to see the first mutex
as being more contended, so the Abseil approach is the more useful one.
This CL adopts "contention scales with number of goroutines blocked",
to better match Abseil [1]. However, it still makes sure to attribute the
time to the unlock that caused the backup, not subsequent innocent
unlocks that were affected by the congestion. In this way it still gives
more accurate profiles than Abseil does.
[1] https://github.com/abseil/abseil-cpp/blob/lts_2023_01_25/absl/synchronization/mutex.cc#L2390Fixes#61015.
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With #61035 fixed, types2.Sizes matches the compiler behavior, so use its
Sizes implementation instead of rolling our own copy.
Updates #61035
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Change-Id: Ic4fcfe7335dab219790c19ded3bbb7265857404f
GitHub-Last-Rev: afc69c79b2
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The syscall package isn't getting new system call support,
but it is not deprecated.
Fixes#60797
Change-Id: I33b60269f9ce70ac2108fa0f3d42fd87a3076bf1
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ld-prime emits a deprecation warning for -bind_at_load. The flag
is needed for plugins to not deadlock (#38824) when linking with
older darwin linker. It is supposedly not needed with newer linker
when chained fixups are used. For now, we always pass it, and
suppress the warning.
For #61229.
Change-Id: I4b8a6f864a460c40dc38adbb533f664f7fd5343c
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These operations misbehave and cause hangs and flakes.
Fail hard if they are attempted.
Tested by backing out the Darwin-profiling-hang fix
CL 518836 and running run.bash, the guard panicked in
runtime/pprof tests, as expected/hoped.
Updates #61768
Change-Id: I89b6f85745fbaa2245141ea98f584afc5d6b133e
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Adjust some rewrite code to match current code base.
Change-Id: I7d3b79b764b95d664dd95e1057725f15a94973d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/519856
Run-TryBot: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Add runtime support for range over functions, specifically
for defer in the loop body. The defer is running in one
function but needs to append to the deferred function list
for a parent function. This CL implements the runtime
support for that, in the form of two new functions:
deferrangefunc, which obtains a token representing the
current frame, and deferprocat, which is like deferproc
but adds to the list for frame denoted by the token.
Preparation for proposal #61405. The actual logic in the
compiler will be guarded by a GOEXPERIMENT; this code
will only run if the compiler emits calls to deferprocat.
Change-Id: I08adf359100856d21d7ff4b493afa229c9471e70
Reviewed-on: https://go-review.googlesource.com/c/go/+/510540
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
syscall.Unshare is the sort of system call that may be blocked in a
container environment, and experience has shown that different
container implementations choose from a variety of different error
codes for blocked syscalls.
In particular, the patch in
https://git.alpinelinux.org/aports/tree/community/go/tests-unshare-enosys.patch
seems to suggest that the container environment used to test the Go
distribution on Alpine Linux returns ENOSYS instead of EPERM.
The existing testenv.SyscallIsNotSupported helper checks for
the kinds of error codes we have seen from containers in practice, so
let's use that here.
For #62053.
Updates #29366.
Change-Id: Ic6755f7224fcdc0cb8b25dde2d6047ceb5c3ffdf
Reviewed-on: https://go-review.googlesource.com/c/go/+/520057
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
I don't understand the rationale given in
https://git.alpinelinux.org/aports/commit/community/go/tests-unset-GCCGO.patch?id=a10e9a5e48507198e26a8cf19709e4059da4c79f,
but I suspect that it may be working around test failures when
cross-compiling, since we have a lot of other gccgo tests that need to
skip in that circumstance.
Alternatively, that may just be a stale patch working around #53815.
I can't fine any issue filed against the Go project for this patch,
so it's hard to be sure.
Either way, adding this skip should make the test more robust.
For #62053.
Change-Id: I44dbe9a5a24c0e2d3f22fbe6ca995160a36b2606
Reviewed-on: https://go-review.googlesource.com/c/go/+/520056
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
This is subtle and the compiler and runtime be in sync.
It is easier to develop the rest of the changes (especially when using
toolstash save/restore) if this change is separated out and done first.
Preparation for proposal #61405. The actual logic in the
compiler will be guarded by a GOEXPERIMENT, but it is
easier not to have GOEXPERIMENT-specific data structures
in the runtime, so just make the field always.
Change-Id: I7ec7049b99ae98bf0db365d42966baeec56e3774
Reviewed-on: https://go-review.googlesource.com/c/go/+/510539
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Most of the code is not necessary anymore.
Before we start changing how range works,
delete this code so it won't need updating.
Preparation for proposal #61405.
Change-Id: Ia6c6cc62b156e38a871279350a2e60c189967cac
Reviewed-on: https://go-review.googlesource.com/c/go/+/510536
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This makes the intrinsic available on 64-bit platforms,
since the runtime cannot import math/bits.
Change-Id: I5296cc6a97d1cb4756ab369d96dc9605df9f8247
Reviewed-on: https://go-review.googlesource.com/c/go/+/516861
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
TryBot-Bypass: Russ Cox <rsc@golang.org>
Compact the Regexp.String output. It was only ever intended for debugging,
but there are at least some uses in the wild where regexps are built up
using regexp/syntax and then formatted using the String method.
Compact the output to help that use case. Specifically:
- Compact 2-element character class ranges: [a-b] -> [ab].
- Aggregate flags: (?i:A)(?i:B)*(?i:C)|(?i:D)?(?i:E) -> (?i:AB*C|D?E).
Fixes#57950.
Change-Id: I1161d0e3aa6c3ae5a302677032bb7cd55caae5fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/507015
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
