Offsetwriter refers to the design of SectionReader and removes
the section parameter n.
Since the size of the written data is determined by the user,
we cannot know where the end offset of the original data is.
The offset of SeekEnd is not valid in Seek method.
Fixes#45899.
Change-Id: I9d9445aecfa0dd4fc5168f2f65e1e3055c201b45
Reviewed-on: https://go-review.googlesource.com/c/go/+/406776
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
AppendRune appends the UTF-16 encoding of a rune to a []uint16.
BenchmarkEncodeValidASCII-12 24.61ns 16B 1allocs
BenchmarkEncodeValidJapaneseChars-12 18.79ns 8B 1allocs
BenchmarkAppendRuneValidASCII-12 6.826ns 0B 0allocs
BenchmarkAppendRuneValidJapaneseChars-12 3.547ns 0B 0allocs
The ASCII case is written to be inlineable.
Fixes#51896
Change-Id: I593b1029f603297ef6e80e036f2fee2a0938d38d
Reviewed-on: https://go-review.googlesource.com/c/go/+/409054
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Reviewed-by: Joedian Reid <joedian@golang.org>
Though it increases the execution time, the function is already quite
fast for most users, the allocation is much more important.
name old time/op new time/op delta
ByteReplacerWriteString-8 1.23µs ± 0% 2.16µs ± 1% +75.31% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
ByteReplacerWriteString-8 2.69kB ± 0% 0.00kB -100.00% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
ByteReplacerWriteString-8 1.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10)
Change-Id: I6a36df5fcb8e11ef27e6c7b252aa88e869592f3c
Reviewed-on: https://go-review.googlesource.com/c/go/+/424136
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Support for Linux kernel versions requiring the fallback to CloseOnExec
was dropped from recent Go versions. The minimum Linux kernel version is
2.6.32 as of Go 1.18. The SOCK_CLOEXEC flag for the socket syscall is
supported since kernel version 2.6.27.
Follows a similar change for net.sysSocket in CL 403634.
For #45964
Change-Id: I8b6311f07c4ed7900a9af3ecb2e146c49db08665
Reviewed-on: https://go-review.googlesource.com/c/go/+/422374
Reviewed-by: Joedian Reid <joedian@golang.org>
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Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
The constants for these were auto-generated from the C includes
into zerrors_linux* files quite some time ago. The generator is
currently broken, but some new flags need to be added nevertheless.
As the flags won't change and the values are the same for all
architectures, we can just define them statically (as it's already
done in the runtime package):
- remove the CLONE_* constants from zerrors_linux_*.go;
- patch mkerrors.sh to not generate CLONE_ constants
(in case it will be fixed and used in the future);
- add the constants and some comments about them to exec_linux.go,
using Linux v5.17 include/uapi/sched.h as the ultimate source.
This adds the following new flags:
- CLONE_CLEAR_SIGHAND
- CLONE_INTO_CGROUP
- CLONE_NEWCGROUP
- CLONE_NEWTIME
- CLONE_PIDFD
For #51246.
Change-Id: I0c635723926218bd403d37e113ee4d62194463a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/407574
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Joedian Reid <joedian@golang.org>
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In order to prevent false sharing of cache lines, structs are
padded with some number of bytes. These bytes are unused, serving
only to make the size of the struct a multiple of the size of the
cache line.
The current calculation of how much to pad is an overestimation,
when the struct size is already a multiple of the cache line size
without padding. For these cases, no padding is necessary, and
the size of the inner pad field should be 0. The bug is that the
pad field is sized to a whole 'nother cache line, wasting space.
Here is the current formula that can never return 0:
cpu.CacheLinePadSize - unsafe.Sizeof(myStruct{})%cpu.CacheLinePadSize
This change simply mods that calculation by cpu.CacheLinePadSize,
so that 0 will be returned instead of cpu.CacheLinePadSize.
Change-Id: I26a2b287171bf47a3b9121873b2722f728381b5e
Reviewed-on: https://go-review.googlesource.com/c/go/+/414214
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
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Avoid allocating large amounts of memory for corrupt input.
No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.
Fixes#53369
Change-Id: I67c5e75bf181ad84988d6d6da12507df0e6df8e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/413979
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
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For #23870
Change-Id: I3bbe0f751254d1354a59a88b45e6f944c7a2fb4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/417874
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Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
Occasionally the signal will be sent to a Go thread, which will cause
the program to exit with SIGQUIT rather than SIGSEGV.
Add TestSignalForwardingGo to test the case where the signal is
expected to be delivered to a Go thread.
Fixes#53907
Change-Id: Iaefb964c2be4a815c11c507fa89648f8a7740ba9
Reviewed-on: https://go-review.googlesource.com/c/go/+/419014
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Austin Clements <austin@google.com>
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Run-TryBot: Ian Lance Taylor <iant@google.com>
A single dot in a search statement doesn't affect DNS lookup, so just ignore it and a syntax error.
Fixes#54124
Change-Id: Idd43bd34c5c16af50cba51f0b6e24f992eec6e57
Reviewed-on: https://go-review.googlesource.com/c/go/+/423875
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Call only initHPETTimecounter on the system stack.
Use O_CLOEXEC flag when opening the HPET device.
FreeBSD 12.3-RELEASE-p2, AMD FX-8300
paulzhol@relic:~/go/src/time % ~/gocode/bin/benchcmp old_hpet.txt new_hpet.txt
benchcmp is deprecated in favor of benchstat: https://pkg.go.dev/golang.org/x/perf/cmd/benchstat
benchmark old ns/op new ns/op delta
BenchmarkNow-8 1420 1397 -1.62%
BenchmarkNowUnixNano-8 1421 1404 -1.20%
BenchmarkNowUnixMilli-8 1423 1405 -1.26%
BenchmarkNowUnixMicro-8 1423 1404 -1.34%
Update #50947
Change-Id: I553b5427fb0b86d7e070af4516b36326bc0aaf00
Reviewed-on: https://go-review.googlesource.com/c/go/+/391856
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Unified IR is now at feature parity with the non-unified frontend.
Change-Id: I2a8cd41267a66f5eb1f425b89d18c6d501676e07
Reviewed-on: https://go-review.googlesource.com/c/go/+/422235
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: David Chase <drchase@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Since the spec tests are now identical between the two type checkers,
remove the local copy of the spec tests and (for now) use the tests
in go/types/testdata/spec instead. Eventually we may decide to move
all tests out of the type checker directories and place them in a
shared space (e.g. internal/types/testdata).
For #54511.
Change-Id: Ibc62230553a5ff215160dcc97696b333ae9cf685
Reviewed-on: https://go-review.googlesource.com/c/go/+/424676
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Besides applying gofmt (which doesn't damage the tests in this case),
this removes a TODO for a set of nil-related tests.
The test files are now identical.
For #54511.
Change-Id: I0a286ad607f317f43972c1f5ee741b4f5bc9576d
Reviewed-on: https://go-review.googlesource.com/c/go/+/424675
Run-TryBot: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Griesemer <gri@google.com>
Besides applying gofmt (which doesn't damage the tests in this case),
the ERROR comments in the types2 files now match the go/types files.
But because types2 still reports some errors are different positions,
the checking code now allows for some position discrepancy (similar
to what we do for other tests).
Except for an outstanding TODO in go/types/testdata/examples/types.go
the test files are now identical.
For #54511.
Change-Id: I5748e0f678d11c5c0bdf4fdf28bd04f0b11b5b23
Reviewed-on: https://go-review.googlesource.com/c/go/+/424674
Reviewed-by: Robert Findley <rfindley@google.com>
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Instead of simply reporting an error but otherwise dropping the
index expression from the parse tree when an index is missing
(as in: x[]), create an index expression with a "bad expression"
as index. This matches the behavior of go/parser and permits the
use of the same test case for both parsers.
(It would be simpler to adjust the go/parser to match the syntax
parser's behavior, but that would break backward-compatibility
of the go/parser.)
Adjust the affected test files.
For #54511.
Change-Id: If7668973794604593e869a24b560da92e100b812
Reviewed-on: https://go-review.googlesource.com/c/go/+/424654
Run-TryBot: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Griesemer <gri@google.com>
Update the version of BoringCrypto to boringssl tag
fips-20210429, for which FIPS approval is "in process".
Add GOARCH=arm64 BoringCrypto support.
Shuffle build to run as distinct steps in Docker so that
we can rerun later parts like build-goboring.sh without
rerunning all the setup.
Strip unnecessary parts of the syso using --strip-unneeded,
which cuts the amd64 syso from 10MB to 2.5MB.
The new arm64 syso is 2MB, so even though we added a new
architecture, we have half as much syso to distribute.
Change-Id: I0f7327389a3a485b82577abea9153d006418298f
Reviewed-on: https://go-review.googlesource.com/c/go/+/423362
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
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This resolves a TODO. Also, it allows go/types and types2 to use
identical test files in testdata/spec, a prerequisition for sharing
them eventually.
For #54511.
Change-Id: Ia9d11b15ada237c18b6ce8f72732f70134a1a06f
Reviewed-on: https://go-review.googlesource.com/c/go/+/424537
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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This does not enable any new functionality. It should
behave identically to GOPPC64=power9.
Updates #44549
Change-Id: I9a860544527fcfe97cbaf89686459d40dcf9593e
Reviewed-on: https://go-review.googlesource.com/c/go/+/352791
Run-TryBot: Paul Murphy <murp@ibm.com>
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Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
CL 424396 and CL 424397 changed timer0When/timerModifiedEarliest to
atomic.Uint64, just they're guaranted to have 64-bit alignment.
Change-Id: Idaff1059da2aac84520b9b0e34f9721a74dbba5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/424794
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
Not used any more.
Fixes#53860
Change-Id: Id0b1c3ed30b576d6c5f08f064d1262de337262b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/418374
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
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With the introduction of stack objects, VARKILL information is
no longer needed.
With stack objects, an object is dead when there are no more static
references to it, and the stack scanner can't find any live pointers
to it. VARKILL information isn't used to establish live ranges for
address-taken variables any more. In effect, the last static reference
*is* the VARKILL, and there's an additional dynamic liveness check
during stack scanning.
Next CL will actually rip out the VARKILL opcodes.
Change-Id: I030a2ab867445cf4e0e69397911f8a2e2f0ed07b
Reviewed-on: https://go-review.googlesource.com/c/go/+/419234
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Reviewed-by: Cherry Mui <cherryyz@google.com>
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We don't need this special loop construct anymore now that we do
conservative GC scanning of the top of stack. Rewrite instead to a simple
pointer increment on every iteration. This leads to having a potential
past-the-end pointer at the end of the last iteration, but that value
immediately goes dead after the loop condition fails, and the past-the-end
pointer is never live across any call.
This simplifies and speeds up loops.
R=go1.20
TODO: actually delete all support for OFORUNTIL. It is now never generated,
but code to handle it (e.g. in ssagen) is still around.
TODO: in "for _, x := range" loops, we could get rid of the index
altogether and use a "pointer to the last element" reference to determine
when the loop is complete.
Fixes#53409
Change-Id: Ifc141600ff898a8bc6a75f793e575f8862679ba1
Reviewed-on: https://go-review.googlesource.com/c/go/+/414876
Run-TryBot: Keith Randall <khr@golang.org>
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Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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The non-unified frontend had repeated issues with inlining and
generics (#49309, #51909, #52907), which led us to substantially
restrict inlining when shape types were present.
However, these issues are evidently not present in unified IR's
inliner, and the safety restrictions added for the non-unified
frontend can simply be disabled in unified mode.
Fixes#54497.
Change-Id: I8e6ac9f3393c588bfaf14c6452891b9640a9d1bd
Reviewed-on: https://go-review.googlesource.com/c/go/+/424775
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Keith Randall <khr@google.com>
As a consistency check in devirtualization, when we determine `i` (of
interface type `I`) always has dynamic type `T`, we insert a type
assertion `i.(T)`. This emits an itab check for `go:itab.T,I`, but
it's always true (and so SSA optimizes it away).
However, if `I` is instead the generic interface type `I[T]`, then
`go:itab.T,I[int]` and `go:itab.T,I[go.shape.int]` are equivalent but
distinct itabs. And notably, we'll have originally created the
interface value using the former; but the (non-dynamic) TypeAssertExpr
created by devirtualization would ultimately emit a comparison against
the latter. This comparison would then evaluate false, leading to a
spurious type assertion panic at runtime.
The comparison is just meant as an extra safety check, so it should be
safe to just disable. But for now, it's simpler/safer to just punt on
devirtualization in this case. (The non-unified frontend doesn't
devirtualize this either.)
Change-Id: I6a8809bcfebc9571f32e289fa4bc6a8b0d21ca46
Reviewed-on: https://go-review.googlesource.com/c/go/+/424774
Reviewed-by: Keith Randall <khr@golang.org>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
For local variables of derived type, Delve relies on ir.Name.DictIndex
being set to the type's rtype index within the function's dictionary.
This CL implements that functionality within unified IR.
Manually double checked that Delve behaves correctly, at least as far
as I can tell from casual use. Specifically, I confirmed that running
the test program from TestDictIndex, stepping into testfn, and then
running `print mapvar` prints `map[int]main.CustomInt []`, which
matches the behavior under GOEXPERIMENT=nounified. (Also compare that
when ir.Name.DictIndex is *not* set by unified IR, `print mapvar`
instead prints `map[int]go.shape.int []`.)
Fixes#54514.
Change-Id: I90d443945895abfba04dc018f15e00217930091c
Reviewed-on: https://go-review.googlesource.com/c/go/+/424735
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
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This CL implements pointer shaping in unified IR, corresponding to the
existing pointer shaping implemented in the non-unified frontend.
For example, if `func F[T any]` is instantiated as both `F[*int]` and
`F[*string]`, we'll now generate a single `F[go.shape.*uint8]` shaped
function that can be used by both.
Fixes#54513.
Change-Id: I2cef5ae411919e6dc5bcb3cac912abecb4cd5218
Reviewed-on: https://go-review.googlesource.com/c/go/+/424734
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So they match with when/nextwhen fields of timer struct.
Updates #53821
Change-Id: Iad0cceb129796745774facfbbfe5756df3a320b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/423117
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
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Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Even though the -race option works for ppc64le, some of the
testsanitizer test have failed in the past on our builders. These
same failures can't be reproduced on other systems.
This is an experiment to re-enable this test on ppc64le to see if
it still fails on the builders.
Updates #45040
Change-Id: I0729bec5864e6c4cc752968485e89179df027063
Reviewed-on: https://go-review.googlesource.com/c/go/+/424534
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Archana Ravindar <aravind5@in.ibm.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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printer.print is an overloaded method for multiple purposes.
When fed a position, it updates the current position.
When fed a string, it prints the string.
When fed a token, it prints the token. And so on.
However, this overloading comes at a significant cost.
Because the parameters are a list of the `any` interface type,
any type which is not of pointer or interface kind will allocate when
passed as an argument, as interfaces can only contain pointers.
A large portion of the arguments passed to the print method are of type
token.Pos, whose underlying type is int - so it allocates.
Removing those allocations has a significant benefit,
at the cost of some verbosity in the code:
name old time/op new time/op delta
Print-16 6.10ms ± 2% 5.39ms ± 2% -11.72% (p=0.000 n=10+10)
name old speed new speed delta
Print-16 8.50MB/s ± 2% 9.63MB/s ± 2% +13.28% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
Print-16 443kB ± 0% 332kB ± 0% -25.10% (p=0.000 n=10+9)
name old allocs/op new allocs/op delta
Print-16 17.3k ± 0% 3.5k ± 0% -80.10% (p=0.000 n=10+10)
There should be more significant speed-ups left, particularly for the
token.Token, string, and whiteSpace types fed to the same method.
They are left for a future CL, in case this kind of optimization is not
a path we want to take.
Change-Id: I3ff8387242c5a935bb003e60e0813b7b9c65402e
Reviewed-on: https://go-review.googlesource.com/c/go/+/412557
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Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
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These are only used once right after being set in castagnoliInit and
ieeeInit, respectively.
Change-Id: Ifc5df1fe3040b97b1d252cc6d6d28d8fbc132fa5
Reviewed-on: https://go-review.googlesource.com/c/go/+/423854
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Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
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The golang.org/x/sys/unix package is already imported for Utsname and
Uname. Use ByteSliceToString from that package as well to replace the
locally defined utsString helper which serves the same purpose and
matches ByteSliceToString's implementation.
Change-Id: I5d9de186a5aeb1feed1387beedefbcd260fe22ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/415654
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No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.
For #47653Fixes#53530
Change-Id: If1cebbbcabb188fec8be30ef043c8c4c935a9564
Reviewed-on: https://go-review.googlesource.com/c/go/+/413995
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
The documentation for LoadLocation contains an enumerated list,
but does not render as such because it's missing leading spaces.
Output verified with the go doc command and godoc server.
Change-Id: I88b61d34048b7d01ee5cd77c32849af266e2f4c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/423297
Reviewed-by: Bryan Mills <bcmills@google.com>
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Support for operating system versions requiring the fallback to
CloseOnExec/SetNonblock was dropped from recent Go versions. The minimum
Linux kernel version is 2.6.32 as of Go 1.18. FreeBSD 10 is no longer
supported as of Go 1.13.
Follows a similar change for net.sysSocket in CL 403634 and
syscall.Socket in CL 422374.
For #45964
Change-Id: I60848415742a1d8204e1fda585462ff35ad6722f
Reviewed-on: https://go-review.googlesource.com/c/go/+/422375
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Most newer architectures (e.g. arm64, riscv64, loong64) don't provide the
epoll_create syscall. Some systems (e.g. Android) block it even if it
were available. In the kernel, the epoll_create syscall is implemented
[1] the same way EpollCreate is implemented in this package for
platforms without the epoll_create syscall. The epoll_create1 syscall is
available since Linux kernel 2.6.27 and the minimum required kernel
version is 2.6.32 since Go 1.18 (see #45964). Thus, avoid the separate
wrapper and consistently implement EpollCreate using EpollCreate1.
[1] https://elixir.bootlin.com/linux/v5.15-rc1/source/fs/eventpoll.c#L2006
The same change was already done in CL 349809 for golang.org/x/sys/unix.
For #45964
Change-Id: I5463b208aa7ae236fa2c175d6d3ec6568f1840b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/411594
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The previous implementation of isCaseSensitive called t.Fatalf in the
wrong place, causing tests after the first to proceed past an error
determining case-sensitivity. That could lead to confusing errors.
(Moreover, I would like to try to disentangle the script engine from
testing.T so that I can also use it to generate serving contents in
the replacement for vcs-test.golang.org.)
The implementation of goVersion called ts.fatalf, which is probably
fine but prevents the script environment from being computed outside
of a test, as we might want to do for debugging and other scripting.
For #27494.
Change-Id: Ibfee0704523fdcd6174b544ff84267216435025b
Reviewed-on: https://go-review.googlesource.com/c/go/+/419874
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When the GOOS or GOARCH of the cmd/go test binary does not match the
GOOS or GOARCH of the installed 'go' binary itself, the test currently
attempts to trick 'go test' into thinking that there were no test
functions to run.
That makes it very difficult to discover how to actually run the
tests, which in turn makes it difficult to diagnose and fix
regressions in, say, the linux-386-longtest builders. (We have had a
few of those lately, and they shouldn't be as much of an ordeal to fix
as they currently are.)
There are three underlying problems:
1. cmd/go uses its own GOOS and GOARCH to figure out which variant of
other tools to use, and the cache keys for all installed tools and
libraries include the IDs of the tools used to build them. So when
cmd/go's GOARCH changes, all installed tools and binaries appear
stale *even if* they were just installed by invoking the native
cmd/go with the appropriate GOARCH value set.
2. The "go/build" library used by cmd/go toggles its default
CGO_ENABLED behavior depending on whether the GOOS and GOARCH being
imported match runtime.GOOS and runtime.GOARCH.
3. A handful of cmd/go tests explicitly use gccgo, but the user's
installed gccgo binary cannot necessarily cross-compile to the same
platforms as cmd/go.
To address the cache-invalidation problem, we modify the test variant
of cmd/go to use the host's native toolchain (as indicated by the new
TESTGO_GOHOSTOS and TESTGO_GOHOSTARCH environment variables) instead
of the toolchain matching the test binary itself. That allows a test
cmd/go binary compiled with GOARCH=386 to use libraries and tools
cross-compiled by the native toolchain, so that
$ GOARCH=386 go install std cmd
suffices to make the packages in std and cmd non-stale in the
tests.
To address the CGO_ENABLED mismatch, we set CGO_ENABLED explicitly in
the test's environment whenever it may differ from the default. Since
script tests that use cgo are already expected to use a [cgo]
condition, setting the environment to match that condition fixes the
cgo-specific tests.
To address the gccgo-specific cross-compilation failures, we add a new
script condition, [cross], which evaluates to true whenever the
platform of the test binary differs from that of the native toolchain.
We can then use that condition to explicitly skip the handful of gccgo
tests that fail under cross-compilation.
Fixes#53936.
Change-Id: I8633944f674eb5941ccc95df928991660e7e8137
Reviewed-on: https://go-review.googlesource.com/c/go/+/356611
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Reviewed-by: Russ Cox <rsc@golang.org>
This CL switches unified IR to use shape-based stenciling with runtime
dictionaries, like the existing non-unified frontend. Specifically,
when instantiating generic functions and types `X[T]`, we now also
instantiated shaped variants `X[shapify(T)]` that can be shared by
`T`'s with common underlying types.
For example, for generic function `F`, `F[int](args...)` will be
rewritten to `F[go.shape.int](&.dict.F[int], args...)`.
For generic type `T` with method `M` and value `t` of type `T[int]`,
`t.M(args...)` will be rewritten to `T[go.shape.int].M(t,
&.dict.T[int], args...)`.
Two notable distinctions from the non-unified frontend:
1. For simplicity, currently shaping is limited to simply converting
type arguments to their underlying type. Subsequent CLs will implement
more aggressive shaping.
2. For generic types, a single dictionary is generated to be shared by
all methods, rather than separate dictionaries for each method. I
originally went with this design because I have an idea of changing
interface calls to pass the itab pointer via the closure
register (which should have zero overhead), and then the interface
wrappers for generic methods could use the *runtime.itab to find the
runtime dictionary that corresponds to the dynamic type. This would
allow emitting fewer method wrappers.
However, this choice does have the consequence that currently even if
a method is unused and its code is pruned by the linker, it may have
produced runtime dictionary entries that need to be kept alive anyway.
I'm open to changing this to generate per-method dictionaries, though
this would require changing the unified IR export data format; so it
would be best to make this decision before Go 1.20.
The other option is making the linker smarter about pruning unneeded
dictionary entries, like how it already prunes itab entries. For
example, the runtime dictionary for `T[int]` could have a `R_DICTTYPE`
meta-relocation against symbol `.dicttype.T[go.shape.int]` that
declares it's a dictionary associated with that type; and then each
method on `T[go.shape.T]` could have `R_DICTUSE` meta-relocations
against `.dicttype.T[go.shape.T]+offset` indicating which fields
within dictionaries of that type need to be preserved.
Change-Id: I369580b1d93d19640a4b5ecada4f6231adcce3fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/421821
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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