This brings dev.power64 up-to-date with the current tip of
default. go_bootstrap is still panicking with a bad defer
when initializing the runtime (even on amd64).
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/152570049
This also removes pkg/runtime/traceback_lr.c, which was ported
to Go in an earlier commit and then moved to
runtime/traceback.go.
Reviewer: rsc@golang.org
rsc: LGTM
Partial undo, changes to ldelf.c retained.
Some platforms are still not working even with the integrated assembler disabled, will have to find another solution.
««« original CL description
cmd/cgo: disable clang's integrated assembler
Fixes#8348.
Clang's internal assembler (introduced by default in clang 3.4) understands the .arch directive, but doesn't change the default value of -march. This causes the build to fail when we use BLX (armv5 and above) when clang is compiled for the default armv4t architecture (which appears to be the default on all the distros I've used).
This is probably a clang bug, so work around it for the time being by disabling the integrated assembler when compiling the cgo assembly shim.
This CL also includes a small change to ldelf.c which was required as clang 3.4 and above generate more weird symtab entries.
LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/156430044
»»»
LGTM=minux
R=iant, minux
CC=golang-codereviews
https://golang.org/cl/162880044
This brings cmd/gc in line with the spec on this question.
It might break existing code, but that code was not conformant
with the spec.
Credit to Rémy for finding the broken code.
Fixes#6366.
LGTM=r
R=golang-codereviews, r
CC=adonovan, golang-codereviews, gri
https://golang.org/cl/129550043
Fixes#8348.
Clang's internal assembler (introduced by default in clang 3.4) understands the .arch directive, but doesn't change the default value of -march. This causes the build to fail when we use BLX (armv5 and above) when clang is compiled for the default armv4t architecture (which appears to be the default on all the distros I've used).
This is probably a clang bug, so work around it for the time being by disabling the integrated assembler when compiling the cgo assembly shim.
This CL also includes a small change to ldelf.c which was required as clang 3.4 and above generate more weird symtab entries.
LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/156430044
https://golang.org/cl/152700045/ made it possible for struct literals assigned to globals to use <N> as the RHS. Normally, this is to zero out variables on first use. Because globals are already zero (or their linker initialized value), we just ignored this.
Now that <N> can occur from non-initialization code, we need to emit this code. We don't use <N> for initialization of globals any more, so this shouldn't cause any excessive zeroing.
Fixes#8961.
LGTM=rsc
R=golang-codereviews, rsc
CC=bradfitz, golang-codereviews
https://golang.org/cl/154540044
Better to avoid the memory loads and just use immediate constants.
This especially applies to zeroing, which was being done by
copying zeros from elsewhere in the binary, even if the value
was going to be completely initialized with non-zero values.
The zero writes were optimized away but the zero loads from
the data segment were not.
LGTM=r
R=r, bradfitz, dvyukov
CC=golang-codereviews
https://golang.org/cl/152700045
hg was unable to create a CL on the code review server for this,
so I am submitting the merge by hand.
The only manual edits are in mgc0.c, to reapply the
removal of cached/ncached to the new code.
Both of these forms can avoid writing to the base pointer in x
(in the slice, always, and in the append, most of the time).
For Go 1.5, will need to change the compilation of x = x[0:y]
to avoid writing to the base pointer, so that the elision is safe,
and will need to change the compilation of x = append(x, ...)
to write to the base pointer (through a barrier) only when
growing the underlying array, so that the general elision is safe.
For Go 1.4, elide the write barrier always, a change that should
have equivalent performance characteristics but is much
simpler and therefore safer.
benchmark old ns/op new ns/op delta
BenchmarkBinaryTree17 3910526122 3918802545 +0.21%
BenchmarkFannkuch11 3747650699 3732600693 -0.40%
BenchmarkFmtFprintfEmpty 106 98.7 -6.89%
BenchmarkFmtFprintfString 280 269 -3.93%
BenchmarkFmtFprintfInt 296 282 -4.73%
BenchmarkFmtFprintfIntInt 467 470 +0.64%
BenchmarkFmtFprintfPrefixedInt 418 398 -4.78%
BenchmarkFmtFprintfFloat 574 535 -6.79%
BenchmarkFmtManyArgs 1768 1818 +2.83%
BenchmarkGobDecode 14916799 14925182 +0.06%
BenchmarkGobEncode 14110076 13358298 -5.33%
BenchmarkGzip 546609795 542630402 -0.73%
BenchmarkGunzip 136270657 136496277 +0.17%
BenchmarkHTTPClientServer 126574 125245 -1.05%
BenchmarkJSONEncode 30006238 27862354 -7.14%
BenchmarkJSONDecode 106020889 102664600 -3.17%
BenchmarkMandelbrot200 5793550 5818320 +0.43%
BenchmarkGoParse 5437608 5463962 +0.48%
BenchmarkRegexpMatchEasy0_32 192 179 -6.77%
BenchmarkRegexpMatchEasy0_1K 462 460 -0.43%
BenchmarkRegexpMatchEasy1_32 168 153 -8.93%
BenchmarkRegexpMatchEasy1_1K 1420 1280 -9.86%
BenchmarkRegexpMatchMedium_32 338 286 -15.38%
BenchmarkRegexpMatchMedium_1K 107435 98027 -8.76%
BenchmarkRegexpMatchHard_32 5941 4846 -18.43%
BenchmarkRegexpMatchHard_1K 185965 153830 -17.28%
BenchmarkRevcomp 795497458 798447829 +0.37%
BenchmarkTemplate 132091559 134938425 +2.16%
BenchmarkTimeParse 604 608 +0.66%
BenchmarkTimeFormat 551 548 -0.54%
LGTM=r
R=r, dave
CC=golang-codereviews, iant, khr, rlh
https://golang.org/cl/159960043
Among other things, *x = T{} does not need a write barrier.
The changes here avoid an unnecessary copy even when
no pointers are involved, so it may have larger effects.
In 6g and 8g, avoid manually repeated STOSQ in favor of
writing explicit MOVs, under the theory that the MOVs
should have fewer dependencies and pipeline better.
Benchmarks compare best of 5 on a 2012 MacBook Pro Core i5
with TurboBoost disabled. Most improvements can be explained
by the changes in this CL.
The effect in Revcomp is real but harder to explain: none of
the instructions in the inner loop changed. I suspect loop
alignment but really have no idea.
benchmark old new delta
BenchmarkBinaryTree17 3809027371 3819907076 +0.29%
BenchmarkFannkuch11 3607547556 3686983012 +2.20%
BenchmarkFmtFprintfEmpty 118 103 -12.71%
BenchmarkFmtFprintfString 289 277 -4.15%
BenchmarkFmtFprintfInt 304 290 -4.61%
BenchmarkFmtFprintfIntInt 507 458 -9.66%
BenchmarkFmtFprintfPrefixedInt 425 408 -4.00%
BenchmarkFmtFprintfFloat 555 555 +0.00%
BenchmarkFmtManyArgs 1835 1733 -5.56%
BenchmarkGobDecode 14738209 14639331 -0.67%
BenchmarkGobEncode 14239039 13703571 -3.76%
BenchmarkGzip 538211054 538701315 +0.09%
BenchmarkGunzip 135430877 134818459 -0.45%
BenchmarkHTTPClientServer 116488 116618 +0.11%
BenchmarkJSONEncode 28923406 29294334 +1.28%
BenchmarkJSONDecode 105779820 104289543 -1.41%
BenchmarkMandelbrot200 5791758 5771964 -0.34%
BenchmarkGoParse 5376642 5310943 -1.22%
BenchmarkRegexpMatchEasy0_32 195 190 -2.56%
BenchmarkRegexpMatchEasy0_1K 477 455 -4.61%
BenchmarkRegexpMatchEasy1_32 170 165 -2.94%
BenchmarkRegexpMatchEasy1_1K 1410 1394 -1.13%
BenchmarkRegexpMatchMedium_32 336 329 -2.08%
BenchmarkRegexpMatchMedium_1K 108979 106328 -2.43%
BenchmarkRegexpMatchHard_32 5854 5821 -0.56%
BenchmarkRegexpMatchHard_1K 185089 182838 -1.22%
BenchmarkRevcomp 834920364 780202624 -6.55%
BenchmarkTemplate 137046937 129728756 -5.34%
BenchmarkTimeParse 600 594 -1.00%
BenchmarkTimeFormat 559 539 -3.58%
LGTM=r
R=r
CC=golang-codereviews, iant, khr, rlh
https://golang.org/cl/157910047
The assembler could give a better error, but this one
is good enough for now.
Fixes#8880.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/153610043
The racewalk code was not updated for the new write barriers.
Make it more future-proof.
The new write barrier code assumed that +1 pointer would
be aligned properly for any type that might follow, but that's
not true on 32-bit systems where some types are 64-bit aligned.
The only system like that today is nacl/amd64p32.
Insert a dummy pointer so that the ambiguously typed
value is at +2 pointers, which is always max-aligned.
LGTM=r
R=r
CC=golang-codereviews, iant, khr
https://golang.org/cl/158890046
Assignments of 2-, 3-, and 4-word values were handled
by individual MOV instructions (and for scalars still are).
But if there are pointers involved, those assignments now
go through the write barrier routine. Before this CL, they
went to writebarrierfat, which calls memmove.
Memmove is too much overhead for these small
amounts of data.
Instead, call writebarrierfat{2,3,4}, which are specialized
for the specific amount of data being copied.
Today the write barrier does not care which words are
pointers, so size alone is enough to distinguish the cases.
If we keep these distinctions in Go 1.5 we will need to
expand them for all the pointer-vs-scalar possibilities,
so the current 3 functions will become 3+7+15 = 25,
still not a large burden (we deleted more morestack
functions than that when we dropped segmented stacks).
BenchmarkBinaryTree17 3250972583 3123910344 -3.91%
BenchmarkFannkuch11 3067605223 2964737839 -3.35%
BenchmarkFmtFprintfEmpty 101 96.0 -4.95%
BenchmarkFmtFprintfString 267 235 -11.99%
BenchmarkFmtFprintfInt 261 253 -3.07%
BenchmarkFmtFprintfIntInt 444 402 -9.46%
BenchmarkFmtFprintfPrefixedInt 374 346 -7.49%
BenchmarkFmtFprintfFloat 472 449 -4.87%
BenchmarkFmtManyArgs 1537 1476 -3.97%
BenchmarkGobDecode 13986528 12432985 -11.11%
BenchmarkGobEncode 13120323 12537420 -4.44%
BenchmarkGzip 451925758 437500578 -3.19%
BenchmarkGunzip 113267612 110053644 -2.84%
BenchmarkHTTPClientServer 103151 77100 -25.26%
BenchmarkJSONEncode 25002733 23435278 -6.27%
BenchmarkJSONDecode 94213717 82568789 -12.36%
BenchmarkMandelbrot200 4804246 4713070 -1.90%
BenchmarkGoParse 4646114 4379456 -5.74%
BenchmarkRegexpMatchEasy0_32 163 158 -3.07%
BenchmarkRegexpMatchEasy0_1K 433 391 -9.70%
BenchmarkRegexpMatchEasy1_32 154 138 -10.39%
BenchmarkRegexpMatchEasy1_1K 1481 1132 -23.57%
BenchmarkRegexpMatchMedium_32 282 270 -4.26%
BenchmarkRegexpMatchMedium_1K 92421 86149 -6.79%
BenchmarkRegexpMatchHard_32 5209 4718 -9.43%
BenchmarkRegexpMatchHard_1K 158141 147921 -6.46%
BenchmarkRevcomp 699818791 642222464 -8.23%
BenchmarkTemplate 132402383 108269713 -18.23%
BenchmarkTimeParse 509 478 -6.09%
BenchmarkTimeFormat 462 456 -1.30%
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/156200043
Our current pe object reader assumes that every symbol starting with
'.' is section. It appeared to be true, until now gcc 4.9.1 generates
some symbols with '.' at the front. Change that logic to check other
symbol fields in addition to checking for '.'. I am not an expert
here, but it seems reasonable to me.
Added test, but it is only good, if tested with gcc 4.9.1. Otherwise
the test PASSes regardless.
Fixes#8811.
Fixes#8856.
LGTM=jfrederich, iant, stephen.gutekanst
R=golang-codereviews, jfrederich, stephen.gutekanst, iant
CC=alex.brainman, golang-codereviews
https://golang.org/cl/152410043
gcc 4.9.1 generates pe sections with names longer then 8 charters.
From IMAGE_SECTION_HEADER definition:
Name
An 8-byte, null-padded UTF-8 string. There is no terminating null character
if the string is exactly eight characters long. For longer names, this
member contains a forward slash (/) followed by an ASCII representation
of a decimal number that is an offset into the string table.
Our current pe object file reader does not read string table when section
names starts with /. Do that, so (issue 8811 example)
c:\go\path\src\isssue8811>go build
# isssue8811
isssue8811/glfw(.text): isssue8811/glfw(/76): not defined
isssue8811/glfw(.text): undefined: isssue8811/glfw(/76)
becomes
c:\go\path\src\isssue8811>go build
# isssue8811
isssue8811/glfw(.text): isssue8811/glfw(.rdata$.refptr._glfwInitialized): not defined
isssue8811/glfw(.text): undefined: isssue8811/glfw(.rdata$.refptr._glfwInitialized)
Small progress to
Update #8811
LGTM=iant, jfrederich
R=golang-codereviews, iant, jfrederich
CC=golang-codereviews
https://golang.org/cl/154210044
I diffed the output of `nm -n gofmt' before and after this change,
and verified that all changes are correct and all corrupted symbol
names are fixed.
Fixes#8906.
LGTM=iant, cookieo9
R=golang-codereviews, iant, cookieo9
CC=golang-codereviews
https://golang.org/cl/159750043
It seems reasonable that people might want to look up the
ImportComment with "go list".
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/143600043
This will help find bugs during the release freeze.
It's not clear it should be kept for the release itself.
That's issue 8861.
The most likely thing that would trigger this is stale
pointers that previously were ignored or caused memory
leaks. These were allowed due to the use of conservative
collection. Now that everything is precise, we should not
see them anymore.
The small number check reinforces what the stack copier
is already doing, catching the storage of integers in pointers.
It caught issue 8864.
The check is disabled if _cgo_allocate is linked into the binary,
which is to say if the binary is using SWIG to allocate untyped
Go memory. In that case, there are invalid pointers and there's
nothing we can do about it.
LGTM=rlh
R=golang-codereviews, dvyukov, rlh
CC=golang-codereviews, iant, khr, r
https://golang.org/cl/148470043
Depending on flags&KindGCProg,
gc[0] and gc[1] are either pointers or inlined bitmap bits.
That's not compatible with a precise garbage collector:
it needs to be always pointers or never pointers.
Change the inlined bitmap case to store a pointer to an
out-of-line bitmap in gc[0]. The out-of-line bitmaps are
dedup'ed, so that for example all pointer types share the
same out-of-line bitmap.
Fixes#8864.
LGTM=r
R=golang-codereviews, dvyukov, r
CC=golang-codereviews, iant, khr, rlh
https://golang.org/cl/155820043
http://build.golang.org/log/c7a91b6eac8f8daa2bd17801be273e58403a15f2
# cmd/pprof
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#16: ignoring .Linfo_string0 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#17: ignoring .Linfo_string1 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#18: ignoring .Linfo_string2 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#20: ignoring .Linfo_string0 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#21: ignoring .Linfo_string1 in section 16 (type 0)
...
I don't know what these are. Let's ignore them and see if we get any further.
TBR=iant
CC=golang-codereviews
https://golang.org/cl/155030043
For example, fixes 'go vet syscall', which has source
files in package syscall_test.
Fixes#8511.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews, iant
https://golang.org/cl/152220044
Structs without tags have no unique name to use in the
Go definitions generated from the C types.
This caused issue 8812, fixed by CL 149260043.
Avoid future problems by requiring struct tags.
Update runtime as needed.
(There is no other C code in the tree.)
LGTM=bradfitz, iant
R=golang-codereviews, bradfitz, dave, iant
CC=golang-codereviews, khr, r
https://golang.org/cl/150360043
Not found because it was not used by name.
Add name in comments for what's left behind.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://golang.org/cl/148430043
+ static test
NB: there's a preexisting (dynamic) failure of test issue7978.go.
LGTM=iant
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/144650045
This is a minor cleanup following CL 142360043:
The internal parse and format functions in both packages
were almost identical - made them identical by adding an
extra parameter, and documented them as identical.
Eventually we should find a nice way to factor these functions
out, but we cannot do this now while in prep for 1.4.
No functionality change.
LGTM=adonovan
R=adonovan
CC=golang-codereviews
https://golang.org/cl/146520043
Right now it is always pkgname.test.exe, but if pkgname is
patch or install or setup or update, Windows thinks that
running it will install new software, so it pops up a dialog
box asking for more permission.
Renaming the binary avoids the Windows security check.
This only applies to the binary that the Go command writes
to its temporary work directory. If the user runs 'go test -c'
or any of the other ways to generate a test binary, it will
continue to use pkgname.test.exe.
Fixes#8711.
LGTM=bradfitz
R=golang-codereviews, r
CC=alex.brainman, bradfitz, golang-codereviews, iant
https://golang.org/cl/146580043
Update #8798
This is a new implementation of pprof,
written in Go instead of in Perl.
It was written primarily by Raul Silvera and
is in use for profiling programs of all languages
inside Google.
The internal structure is a bit package-heavy,
but it matches the copy used inside Google, and
since it is in an internal directory, we can make
changes to it later if we need to.
The only "new" file here is src/cmd/pprof/pprof.go,
which stitches together the Google pprof and the
Go command libraries for object file access.
I am explicitly NOT interested in style or review
comments on the rest of the files
(that is, src/cmd/pprof/internal/...).
Those are intended to stay as close to the Google
copies as possible, like we did with the pprof Perl script.
Still to do:
- Basic tests.
- Real command documentation.
- Hook up disassemblers.
LGTM=r
R=r, bradfitz, alex.brainman, dave
CC=golang-codereviews
https://golang.org/cl/153750043
For Go 1.3 these external packages were collapsed into
large single-file implementations stored in the cmd/objdump
directory.
For Go 1.4 we want pprof to be able to link against them too,
so move them into cmd/internal, where they can be shared.
The new files are copied from the repo in the file path (rsc.io/...).
Those repos were code reviewed during development
(mainly by crawshaw and minux), because we knew the
main repo would use them.
Update #8798
LGTM=bradfitz
R=crawshaw, bradfitz
CC=golang-codereviews
https://golang.org/cl/153750044
Fixes#5551.
Fixes#4449.
Adds tests for both issues.
Note that the two issues occur only when formatting partial Go code
with indent.
The best way to understand the change is as follows: I took the code
of cmd/gofmt and go/format, combined it into one unified code that
does not suffer from either 4449 nor 5551, and then applied that code
to both cmd/gofmt and go/format.
As a result, there is now much more identical code between the two
packages, making future code deduplication easier (it was not possible
to do that now without adding public APIs, which I was advised not to
do at this time).
More specifically, I took the parse() of cmd/gofmt which correctly
preserves comments (issue 5551) and modified it to fix issue where
it would sometimes modify literal values (issue 4449).
I ended up removing the matchSpace() function because it no longer
needed to do some of its work (insert indent), and a part of its work
had to be done in advance (determining the indentation of first code
line), because that calculation is required for cfg.Fprint() to run.
adjustIndent is used to adjust the indent of cfg.Fprint() to compensate
for the body of wrapper func being indented by one level. This allows
to get rid of the bytes.Replace text manipulation of inner content,
which was problematic and sometimes altered raw string literals (issue
4449). This means that sometimes the value of cfg.Indent is negative,
but that works as expected.
So now the algorithm for formatting partial Go code is:
1. Determine and prepend leading space of original source.
2. Determine and prepend indentation of first code line.
3. Format and write partial Go code (with all of its leading &
trailing space trimmed).
4. Determine and append trailing space of original source.
LGTM=gri
R=golang-codereviews, bradfitz, gri
CC=golang-codereviews
https://golang.org/cl/142360043
CL 149110043 changed yacc to no longer keep a leading space
for quoted tokens. That is OK by itself but unfortunately
yacc was relying on that leading space to notice which tokens
it should not output as const declarations.
Add a few such tokens to expr.y, although it won't make any
immediate difference as we seem to have no tests for yacc.
LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/152720043
Unnecessary; covered by https://golang.org/cl/141690043
Verified by jonathan@titanous.com on golang-dev.
««« original CL description
cmd/ld: close outfile before cleanup
This prevents the temporary directory from being leaked when
the linker is run on a FUSE filesystem.
Fixes#8684.
LGTM=bradfitz
R=golang-codereviews, rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/141840043
»»»
LGTM=jonathan, iant
R=iant, jonathan
CC=golang-codereviews
https://golang.org/cl/150250045
This prevents the temporary directory from being leaked when
the linker is run on a FUSE filesystem.
Fixes#8684.
LGTM=bradfitz
R=golang-codereviews, rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/141840043
This fixes the bug in which the linker reports "missing Go
type information" when a -X option refers to a symbol that is
not used.
Fixes#8821.
LGTM=rsc
R=rsc, r
CC=golang-codereviews
https://golang.org/cl/151000043
go test's handling of _test.go files when the entire
package's set of files has no Test functions has varied
over the past few releases. There are a few interesting
cases (all contain no Test functions):
(1) x_test.go has syntax errors
(2) x_test.go has type errors
(3) x_test.go has runtime errors (say, a func init that panics)
In Go 1.1, tests with (1) or (2) failed; (3) passed.
In Go 1.2, tests with (1) or (2) failed; (3) passed.
In Go 1.3, tests with (1) failed; (2) or (3) passed.
After this CL, tests with (1), (2), or (3) all fail.
This is clearly a corner case, but it seems to me that
the behavior of the test should not change if you
add or remove a line like
func TestAlwaysPasses(t *testing.T) {}
That implies that the _test.go files must always
be built and always be imported into the test binary.
Doing so means that (1), (2), and (3) must all fail.
Fixes#8337.
LGTM=iant
R=golang-codereviews, iant
CC=adg, golang-codereviews, r
https://golang.org/cl/150980043
From issue 7967 I learned:
1) yacc accepts either 'x' or "x" to mean token value 0x78
2) yacc also accepts 'xyz' and "XYZ" to mean token value 0x78
Use strconv.Unquote to simplify the handling of quoted
strings and check that each has only one rune.
Although this does clean things up, it makes 'x' and "x"
treated as different internally (now they are stored as
`'x'` and `"x"`; before they were both ` x`). Grammars that
use both interchangeably will now die with an error
similar to the one from issue 7967:
yacc bug -- cannot have 2 different Ts with same value
"+" and '+'
The echoing of the quotes should make clear what is going on.
The other semantic change caused by using strconv.Unquote
is that '\"' and "\'" are no longer valid. Like in Go, they must be
spelled without the backslash: '"' and "'".
On the other hand, now yacc and Go agree about what character
and string literals mean.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/149110043
The one line that you can't test easily was broken.
This manifested as a failure of a pre-existing test
in test.bash but I didn't notice it (there are a few other
long-standing failures that need to be fixed).
TBR=r
CC=golang-codereviews
https://golang.org/cl/146340044
Today, 'go build -a my/pkg' and 'go install -a my/pkg'
recompile not just my/pkg and all its dependencies that
you wrote but also the standard library packages.
Recompiling the standard library is problematic on
some systems because the installed copy is not writable.
The -a behavior means that you can't use 'go install -a all'
or 'go install -a my/...' to rebuild everything after a Go
release - the rebuild stops early when it cannot overwrite
the installed standard library.
During development work, however, you do want install -a
to rebuild everything, because anything might have changed.
Resolve the conflict by making the behavior of -a depend
on whether we are using a released copy of Go or a devel copy.
In the release copies, -a no longer applies to the standard library.
In the devel copies, it still does.
This is the latest in a long line of refinements to the
"do I build this or not" logic. It is surely not the last.
Fixes#8290.
LGTM=r
R=golang-codereviews, r, tracey.brendan
CC=adg, golang-codereviews, iant
https://golang.org/cl/151730045
Also rebuild doc.go; was stale, so contains extra changes.
Fixes#8677.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews, iant
https://golang.org/cl/148170043
While we are here, remove undocumented, meaningless test -file flag.
Fixes#7724.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews, iant
https://golang.org/cl/149070043
Fix by atom (from CL 89190044), comment and test by me.
Fixes#6823.
LGTM=crawshaw
R=golang-codereviews, crawshaw
CC=0xe2.0x9a.0x9b, adg, golang-codereviews, iant, r
https://golang.org/cl/148180043
If you say 'go get -v' you get extra information when import
paths are not of the expected form.
If you say 'go get -v src/rsc.io/pdf' the message says that
src/rsc.io/pdf does not contain a hostname, which is incorrect.
The problem is that it does not begin with a hostname.
Fixes#7432.
LGTM=r
R=golang-codereviews, r
CC=bradfitz, golang-codereviews, iant
https://golang.org/cl/144650043
If you do 'go get -u rsc.io/pdf' and then rsc.io/pdf's redirect
changes to point somewhere else, after this CL a later
'go get -u rsc.io/pdf' will tell you that.
Fixes#8548.
LGTM=iant
R=golang-codereviews, iant
CC=adg, golang-codereviews, n13m3y3r, r
https://golang.org/cl/147170043
The pattern was only working if the checkout had
already been done, but the code was trying to make
it work even the first time. Test and fix.
Fixes#8335.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews, iant
https://golang.org/cl/146310043
Need to restore the g register. Somehow this line vaporized from
CL 144130043. Also cgo_topofstack -> _cgo_topofstack, that vaporized also.
TBR=rsc
CC=golang-codereviews
https://golang.org/cl/150940044
During a cgo call, the stack can be copied. This copy invalidates
the pointer that cgo has into the return value area. To fix this
problem, pass the address of the location containing the stack
top value (which is in the G struct). For cgo functions which
return values, read the stktop before and after the cgo call to
compute the adjustment necessary to write the return value.
Fixes#8771
LGTM=iant, rsc
R=iant, rsc, khr
CC=golang-codereviews
https://golang.org/cl/144130043
Not sure why they used empty.s and all these other
packages were special cased in cmd/go instead.
Add them to the list.
This avoids problems with net .s files being compiled
with gcc in cgo mode and gcc not supporting // comments
on ARM.
Not a problem with bytes, but be consistent.
The last change fixed the ARM build but broke the Windows build.
Maybe *this* will make everyone happy. Sigh.
TBR=iant
CC=golang-codereviews
https://golang.org/cl/144530046
Corrections due to new strict type rules for data+bss.
Also disable misc/cgo/cdefstest since you can't compile C code anymore.
TBR=iant
CC=golang-codereviews
https://golang.org/cl/148050044
In linker, refuse to write conservative (array of pointers) as the
garbage collection type for any variable in the data/bss GC program.
In the linker, attach the Go type to an already-read C declaration
during dedup. This gives us Go types for C globals for free as long
as the cmd/dist-generated Go code contains the declaration.
(Most runtime C declarations have a corresponding Go declaration.
Both are bss declarations and so the linker dedups them.)
In cmd/dist, add a few more C files to the auto-Go-declaration list
in order to get Go type information for the C declarations into the linker.
In C compiler, mark all non-pointer-containing global declarations
and all string data as NOPTR. This allows them to exist in C files
without any corresponding Go declaration. Count C function pointers
as "non-pointer-containing", since we have no heap-allocated C functions.
In runtime, add NOPTR to the remaining pointer-containing declarations,
none of which refer to Go heap objects.
In runtime, also move os.Args and syscall.envs data into runtime-owned
variables. Otherwise, in programs that do not import os or syscall, the
runtime variables named os.Args and syscall.envs will be missing type
information.
I believe that this CL eliminates the final source of conservative GC scanning
in non-SWIG Go programs, and therefore...
Fixes#909.
LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/149770043
Those C files would have been compiled with 6c.
It's close to impossible to use C correctly anymore,
and the C compilers are going away eventually.
Make them unavailable now.
go1.4.txt change in CL 145890046
LGTM=iant
R=iant
CC=golang-codereviews, r
https://golang.org/cl/149720043
There were at least two bugs:
1) It would overwrite a non-archive.
2) It would truncate a non-archive and then fail.
In general the file handling was too clever to be correct.
Make it more straightforward, doing the creation
separately from archive management.
Fixes#8369.
LGTM=adg, iant
R=golang-codereviews, adg, iant
CC=golang-codereviews
https://golang.org/cl/147010046
This fixes a couple of problems that occur when the linker
removes its temporary directory on Windows. The linker only
creates and removes a temporary directory when doing external
linking. Windows does not yet support external linking.
Therefore, these problems are only seen when using a
cross-compiler hosted on Windows.
In lib9, FindFirstFileW returns just the file name, not the
full path name. Don't assume that we will find a slash.
Changed the code to work either way just in case.
In ld, Windows requires that files be closed before they are
removed, so close the output file before we might try to
remove it.
Fixes#8723.
LGTM=alex.brainman
R=golang-codereviews, alex.brainman
CC=golang-codereviews
https://golang.org/cl/141690043
There's no point in continuing. We will only get confused.
6g already makes this fatal.
LGTM=dave, minux, iant
R=iant, dave, minux
CC=golang-codereviews
https://golang.org/cl/140660043
Now it's two allocations. I don't see much downside to that,
since the two pieces were in different cache lines anyway.
Rename 'conservative' to 'cgo_conservative_type' and make
clear that _cgo_allocate is the only allowed user.
This depends on CL 141490043, which removes the other
use of conservative (in defer).
LGTM=dvyukov, iant
R=khr, dvyukov, iant
CC=golang-codereviews, rlh
https://golang.org/cl/139610043
The C header files are the single point of truth:
every C enum constant Foo is available to Go as _Foo.
Remove or redirect duplicate Go declarations so they
cannot be out of sync.
Eventually we will need to put constants in Go, but for now having
them be out of sync with C is too risky. These predate the build
support for auto-generating Go constants from the C definitions.
LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/141510043
During anylit run, nodes such as SLICEARR(statictmp, [:])
may be generated and are expected to be found unchanged by
gen_as_init.
In some walks (in particular walkselect), the statement
may be walked again and lowered to its usual form, leading to a
crash.
Fixes#8017.
Fixes#8024.
Fixes#8058.
LGTM=rsc
R=golang-codereviews, dvyukov, gobot, rsc
CC=golang-codereviews
https://golang.org/cl/112080043
Previously it might happen before calling dowidth and
result in a compiler crash.
Fixes#8060.
LGTM=dvyukov, rsc
R=golang-codereviews, dvyukov, gobot, rsc
CC=golang-codereviews
https://golang.org/cl/110980044
The argsize PCDATA was specifying the number of
bytes passed to a function call, so that if the function
did not specify its argument count, the garbage collector
could use the call site information to scan those bytes
conservatively. We don't do that anymore, so stop
generating the information.
LGTM=khr
R=khr
CC=golang-codereviews
https://golang.org/cl/139530043
Dmitriy changed all the execution to interpret the BitVector
as an array of bytes. Update the declaration and generation
of the bitmaps to match, to avoid problems on big-endian
machines.
LGTM=khr
R=khr
CC=dvyukov, golang-codereviews
https://golang.org/cl/140570044
The goal here is to allow assembly functions to appear in the middle
of a Go stack (having called other code) and still record enough information
about their pointers so that stack copying and garbage collection can handle
them precisely. Today, these frames are handled only conservatively.
If you write
func myfunc(x *float64) (y *int)
(with no body, an 'extern' declaration), then the Go compiler now emits
a liveness bitmap for use from the assembly definition of myfunc.
The bitmap symbol is myfunc.args_stackmap and it contains two bitmaps.
The first bitmap, in effect at function entry, marks all inputs as live.
The second bitmap, not in effect at function entry, marks the outputs
live as well.
In funcdata.h, define new assembly macros:
GO_ARGS opts in to using the Go compiler-generated liveness bitmap
for the current function.
GO_RESULTS_INITIALIZED indicates that the results have been initialized
and need to be kept live for the remainder of the function; it causes a
switch to the second generated bitmap for the assembly code that follows.
NO_LOCAL_POINTERS indicates that there are no pointers in the
local variables being stored in the function's stack frame.
LGTM=khr
R=khr
CC=golang-codereviews
https://golang.org/cl/137520043
Just go ahead and do it, if something is wrong we'll throw.
Also rip out cc-generated arg ptr maps, they are useless now.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/133690045
A write *p = x that needs a write barrier (not all do)
now turns into runtime.writebarrierptr(p, x)
or one of the other variants.
The write barrier implementations are trivial.
The goal here is to emit the calls in the correct places
and to incur the cost of those function calls in the Go 1.4 cycle.
Performance on the Go 1 benchmark suite below.
Remember, the goal is to slow things down (and be correct).
We will look into optimizations in separate CLs, as part of
the process of comparing Go 1.3 against tip in order to make
sure Go 1.4 runs at least as fast as Go 1.3.
benchmark old ns/op new ns/op delta
BenchmarkBinaryTree17 3118336716 3452876110 +10.73%
BenchmarkFannkuch11 3184497677 3211552284 +0.85%
BenchmarkFmtFprintfEmpty 89.9 107 +19.02%
BenchmarkFmtFprintfString 236 287 +21.61%
BenchmarkFmtFprintfInt 246 278 +13.01%
BenchmarkFmtFprintfIntInt 395 458 +15.95%
BenchmarkFmtFprintfPrefixedInt 343 378 +10.20%
BenchmarkFmtFprintfFloat 477 525 +10.06%
BenchmarkFmtManyArgs 1446 1707 +18.05%
BenchmarkGobDecode 14398047 14685958 +2.00%
BenchmarkGobEncode 12557718 12947104 +3.10%
BenchmarkGzip 453462345 472413285 +4.18%
BenchmarkGunzip 114226016 115127398 +0.79%
BenchmarkHTTPClientServer 114689 112122 -2.24%
BenchmarkJSONEncode 24914536 26135942 +4.90%
BenchmarkJSONDecode 86832877 103620289 +19.33%
BenchmarkMandelbrot200 4833452 4898780 +1.35%
BenchmarkGoParse 4317976 4835474 +11.98%
BenchmarkRegexpMatchEasy0_32 150 166 +10.67%
BenchmarkRegexpMatchEasy0_1K 393 402 +2.29%
BenchmarkRegexpMatchEasy1_32 125 142 +13.60%
BenchmarkRegexpMatchEasy1_1K 1010 1236 +22.38%
BenchmarkRegexpMatchMedium_32 232 301 +29.74%
BenchmarkRegexpMatchMedium_1K 76963 102721 +33.47%
BenchmarkRegexpMatchHard_32 3833 5463 +42.53%
BenchmarkRegexpMatchHard_1K 119668 161614 +35.05%
BenchmarkRevcomp 763449047 706768534 -7.42%
BenchmarkTemplate 124954724 134834549 +7.91%
BenchmarkTimeParse 517 511 -1.16%
BenchmarkTimeFormat 501 514 +2.59%
benchmark old MB/s new MB/s speedup
BenchmarkGobDecode 53.31 52.26 0.98x
BenchmarkGobEncode 61.12 59.28 0.97x
BenchmarkGzip 42.79 41.08 0.96x
BenchmarkGunzip 169.88 168.55 0.99x
BenchmarkJSONEncode 77.89 74.25 0.95x
BenchmarkJSONDecode 22.35 18.73 0.84x
BenchmarkGoParse 13.41 11.98 0.89x
BenchmarkRegexpMatchEasy0_32 213.30 191.72 0.90x
BenchmarkRegexpMatchEasy0_1K 2603.92 2542.74 0.98x
BenchmarkRegexpMatchEasy1_32 254.00 224.93 0.89x
BenchmarkRegexpMatchEasy1_1K 1013.53 827.98 0.82x
BenchmarkRegexpMatchMedium_32 4.30 3.31 0.77x
BenchmarkRegexpMatchMedium_1K 13.30 9.97 0.75x
BenchmarkRegexpMatchHard_32 8.35 5.86 0.70x
BenchmarkRegexpMatchHard_1K 8.56 6.34 0.74x
BenchmarkRevcomp 332.92 359.62 1.08x
BenchmarkTemplate 15.53 14.39 0.93x
LGTM=rlh
R=rlh
CC=dvyukov, golang-codereviews, iant, khr, r
https://golang.org/cl/136380043
Commit to stack copying for stack growth.
We're carrying around a surprising amount of cruft from older schemes.
I am confident that precise stack scans and stack copying are here to stay.
Delete fallback code for when precise stack info is disabled.
Delete fallback code for when copying stacks is disabled.
Delete fallback code for when StackCopyAlways is disabled.
Delete Stktop chain - there is only one stack segment now.
Delete M.moreargp, M.moreargsize, M.moreframesize, M.cret.
Delete G.writenbuf (unrelated, just dead).
Delete runtime.lessstack, runtime.oldstack.
Delete many amd64 morestack variants.
Delete initialization of morestack frame/arg sizes (shortens split prologue!).
Replace G's stackguard/stackbase/stack0/stacksize/
syscallstack/syscallguard/forkstackguard with simple stack
bounds (lo, hi).
Update liblink, runtime/cgo for adjustments to G.
LGTM=khr
R=khr, bradfitz
CC=golang-codereviews, iant, r
https://golang.org/cl/137410043
Fixes warning
# _/home/dfc/go/misc/cgo/test/backdoor
/home/dfc/go/src/cmd/cc/bv.c:43:11: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/136330043
Fixes warning
/home/dfc/go/src/cmd/gc/subr.c:3469:8: runtime error: negation of -9223372036854775808 cannot be represented in type 'int64' (aka 'long'); cast to an unsigned type to negate this value to itself
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/141220043
This CL adjusts code referring to src/pkg to refer to src.
Immediately after submitting this CL, I will submit
a change doing 'hg mv src/pkg/* src'.
That change will be too large to review with Rietveld
but will contain only the 'hg mv'.
This CL will break the build.
The followup 'hg mv' will fix it.
For more about the move, see golang.org/s/go14nopkg.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/134570043
After the three pending CLs listed below, there will be no more .goc files.
134580043 runtime: move stubs.goc code into runtime.c
133670043 runtime: fix windows syscalls for copying stacks
141180043 runtime: eliminate Go -> C -> block paths for Solaris
LGTM=bradfitz
R=golang-codereviews, bradfitz, dave
CC=golang-codereviews, iant, r
https://golang.org/cl/132680043
This will keep the go command from trying to build it
when the cmd/ tree is no longer a special case.
Also update doc.go to refer to the correct location.
(It was incorrect even before this CL.)
LGTM=r
R=iant, r
CC=golang-codereviews
https://golang.org/cl/134560043
newstackcall creates a new stack segment, and we want to
be able to throw away all that code.
LGTM=khr
R=khr, iant
CC=dvyukov, golang-codereviews, r
https://golang.org/cl/139270043
created panic1.go just so diffs were available.
After this CL is in, I'd like to move panic.go -> defer.go
and panic1.go -> panic.go.
LGTM=rsc
R=rsc, khr
CC=golang-codereviews
https://golang.org/cl/133530045
The old change worked fine in my client, but my client
must not have been in a completely clean state.
TBR=r
CC=golang-codereviews
https://golang.org/cl/138100043
1) cmd/dist was copying textflag.h to the build include directory,
but only after compiling package runtime. So other packages could
use it, just not runtime. Copy earlier, so that runtime can use it too.
2) We decided for android that anything marked linux is also included
in the build. The generated linux-specific files in cmd/dist must therefore
have explicit +build !android tags, or else you can't have simultaneous
linux/arm and android/arm builds in a single client. The tag was already
there for at least one file, but it was missing from many others.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/134500043
Mostly NOSPLIT additions.
Had to rewrite atomic_arm.c in Go because it calls lock,
and lock is too complex.
With this CL, I find no Go -> C calls that can split the stack
on any system except Solaris and Windows.
Solaris and Windows need more work and will be done separately.
LGTM=iant, dave
R=golang-codereviews, bradfitz, iant, dave
CC=dvyukov, golang-codereviews, khr, r
https://golang.org/cl/137160043
The -nocgo builder failed because it has cgo disabled
as well as no USER environment variable:
http://build.golang.org/log/2250abb82f5022b72a12997b8ff89fcdeff094c9
# Checking API compatibility.
Error getting current user: user: Current not implemented on linux/amd64
exit status 1
Don't require the environment variable here.
LGTM=minux
R=dave, adg, minux
CC=golang-codereviews
https://golang.org/cl/140290043
The original conversion in CL 132090043 cut up
the function in an attempt to avoid converting most
of the code to Go. This contorts the control flow.
While debugging the onM signal stack bug,
I reconverted sigqueue.goc in its entirety.
This restores the original control flow, which is
much easier to understand.
The current conversion is correct, it's just complex
and will be hard to maintain. The new one is as
readable as the original code.
I uploaded sigqueue.goc as the initial copy of
sigqueue.go in the CL, so if you view the diffs
of sigqueue.go comparing against patch set 2 [sic]
it will show the actual starting point.
For example:
https://golang.org/cl/136160043/diff2/20001:60001/src/pkg/runtime/sigqueue.go
LGTM=dvyukov, iant
R=golang-codereviews, dvyukov, iant
CC=golang-codereviews, khr, r
https://golang.org/cl/136160043
The common code is converted, epoll and kqueue are converted.
Windows and solaris are still C.
LGTM=rsc
R=golang-codereviews, rsc, dave
CC=golang-codereviews, iant, khr, rsc
https://golang.org/cl/132910043
They were in proc.c mainly because there was no portable
traceback source file. As part of converting them to Go,
move to traceback.go.
In order to get access to the PC of _rt0_go,
rename to runtime.rt0_go.
LGTM=r
R=golang-codereviews, r
CC=dvyukov, golang-codereviews, iant, khr
https://golang.org/cl/139110043
The two converted files were nearly identical.
Instead of continuing that duplication, I merged them
into a single traceback.go.
Tested on arm, amd64, amd64p32, and 386.
LGTM=r
R=golang-codereviews, remyoudompheng, dave, r
CC=dvyukov, golang-codereviews, iant, khr
https://golang.org/cl/134200044
The code I wrote originally works for trivial functions
that are inlined at a call site in another package,
because that was how I wrote my local test.
Make hex(x) work for non-inlinable functions too.
LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/140830043
The exported Go definitions appearing in mprof.go are
copied verbatim from debug.go.
The unexported Go funcs and types are new.
The C Bucket type used a union and was not a line-for-line translation.
LGTM=remyoudompheng
R=golang-codereviews, remyoudompheng
CC=dvyukov, golang-codereviews, iant, khr, r
https://golang.org/cl/137040043
We can't translate misaligned things to Go, so start rejecting them in C.
The only one in any build appears to be EpollEvent on linux/amd64.
Fix that.
LGTM=r
R=golang-codereviews, r, dvyukov
CC=golang-codereviews, iant
https://golang.org/cl/137020043
Actually it mostly deletes code -- alg.print and alg.copy go away.
There was only one usage of alg.print for debug purposes.
Alg.copy is used in chan.goc, but Keith replaces them with
memcopy during conversion, so alg.copy is not needed as well.
Converting them would be significant amount of work
for no visible benefit.
LGTM=crawshaw, rsc, khr
R=golang-codereviews, crawshaw, khr
CC=golang-codereviews, rsc
https://golang.org/cl/139930044
I had to rename Kevent and Sigaction to avoid the functions of the
same (lowercase) name.
LGTM=iant, r
R=golang-codereviews, r, iant, aram.h
CC=dvyukov, golang-codereviews, khr
https://golang.org/cl/140740043
As part of the translation of the runtime, we need to rewrite
C printf calls to Go print calls. Consider this C printf:
runtime·printf("[signal %x code=%p addr=%p pc=%p]\n",
g->sig, g->sigcode0, g->sigcode1, g->sigpc);
Today the only way to write that in Go is:
print("[signal ")
printhex(uint64(g->sig))
print(" code=")
printhex(uint64(g->sigcode0))
print(" addr=")
printhex(uint64(g->sigcode1))
print(" pc=")
printhex(uint64(g->sigpc))
print("]\n")
(That's nearly exactly what runtime code looked like in C before
I added runtime·printf.)
This CL recognizes the unexported type runtime.hex as an integer
that should be printed in hexadecimal instead of decimal.
It's a little kludgy, but it's restricted to package runtime.
Other packages can define type hex with no effect at all.
Now we can translate that original printf as the more compact:
print("[signal ", hex(g->sig), " code=", hex(g->sigcode0),
" addr=", hex(g->sigcode1), " pc=", hex(g->sigpc), "]\n")
LGTM=r, iant
R=r, iant
CC=golang-codereviews
https://golang.org/cl/133220043
This is a reapplication of CL 93520045 (changeset 5012df7fac58)
since that was lost during the move to an internal package.
LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/134020043
This is getting a little annoying, but once the runtime structs are
being defined in Go, these will go away. So it's only a temporary cost.
TBR=bradfitz
CC=golang-codereviews
https://golang.org/cl/135940043
This will allow structs containing Efaces in C to be
manipulated as structs containing real interfaces in Go.
The eface struct is still defined for use by Go code.
LGTM=iant
R=golang-codereviews, iant
CC=dvyukov, golang-codereviews, khr, r
https://golang.org/cl/133980044
NaCl requires the addition of a 32-byte "halt sled" at the end
of the text segment. This means that segtext.len is actually
32 bytes shorter than reality. The computation of the file offset
of the end of the data segment did not take this 32 bytes into
account, so if len and len+32 rounded up (by 64k) to different
values, the symbol table overwrote the last page of the data
segment.
The last page of the data segment is usually the C .string
symbols, which contain the strings used in error prints
by the runtime. So when this happens, your program
probably crashes, and then when it does, you get binary
garbage instead of all the usual prints.
The chance of hitting this with a randomly sized text segment
is 32 in 65536, or 1 in 2048.
If you add or remove ANY code while trying to debug this
problem, you're overwhelmingly likely to bump the text
segment one way or the other and make the bug disappear.
Correct all the computations to use segdata.fileoff+segdata.filelen
instead of trying to rederive segdata.fileoff.
This fixes the failure during the nacl/amd64p32 build.
TBR=iant
CC=golang-codereviews
https://golang.org/cl/135050043
uintptr or uint64 in the runtime C were turning into uint in the Go,
bool was turning into uint8, and so on. Fix that.
Also delete Go wrappers for C functions.
The C functions can be called directly now
(but still eventually need to be converted to Go).
LGTM=bradfitz, minux, iant
R=golang-codereviews, bradfitz, iant, minux
CC=golang-codereviews, khr, r
https://golang.org/cl/138740043
To date, the C compilers and Go compilers differed only in how
values were returned from functions. This made it difficult to call
Go from C or C from Go if return values were involved. It also made
assembly called from Go and assembly called from C different.
This CL changes the C compiler to use the Go conventions, passing
results on the stack, after the arguments.
[Exception: this does not apply to C ... functions, because you can't
know where on the stack the arguments end.]
By doing this, the CL makes it possible to rewrite C functions into Go
one at a time, without worrying about which languages call that
function or which languages it calls.
This CL also updates all the assembly files in package runtime to use
the new conventions. Argument references of the form 40(SP) have
been rewritten to the form name+10(FP) instead, and there are now
Go func prototypes for every assembly function called from C or Go.
This means that 'go vet runtime' checks effectively every assembly
function, and go vet's output was used to automate the bulk of the
conversion.
Some functions, like seek and nsec on Plan 9, needed to be rewritten.
Many assembly routines called from C were reading arguments
incorrectly, using MOVL instead of MOVQ or vice versa, especially on
the less used systems like openbsd.
These were found by go vet and have been corrected too.
If we're lucky, this may reduce flakiness on those systems.
Tested on:
darwin/386
darwin/amd64
linux/arm
linux/386
linux/amd64
If this breaks another system, the bug is almost certainly in the
sys_$GOOS_$GOARCH.s file, since the rest of the CL is tested
by the combination of the above systems.
LGTM=dvyukov, iant
R=golang-codereviews, 0intro, dave, alex.brainman, dvyukov, iant
CC=golang-codereviews, josharian, r
https://golang.org/cl/135830043
Update #8527
Fixes two warnings:
src/cmd/gc/mparith3.c:255:10: runtime error: shift exponent 52 is too large for 32-bit type 'int'
src/cmd/gc/mparith3.c:254:14: runtime error: shift exponent 52 is too large for 32-bit type 'int'
LGTM=rsc
R=r, dvyukov, rsc
CC=golang-codereviews
https://golang.org/cl/134940044
Also: use 0x644 file permission if a new file
is created (should not happen anymore, though).
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/126610044
Before, a slice with cap=0 or a string with len=0 might have its
base pointer pointing beyond the actual slice/string data into
the next block. The collector had to ignore slices and strings with
cap=0 in order to avoid misinterpreting the base pointer.
Now, a slice with cap=0 or a string with len=0 still has a base
pointer pointing into the actual slice/string data, no matter what.
The collector can now always scan the pointer, which means
strings and slices are no longer special.
Fixes#8404.
LGTM=khr, josharian
R=josharian, khr, dvyukov
CC=golang-codereviews
https://golang.org/cl/112570044
Fixes test failure in build, probably a good idea anyway.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/131210043
Normally, an expression of the form x.f or *y can be reordered
with function calls and communications.
Select is stricter than normal: each channel expression is evaluated
in source order. If you have case <-x.f and case <-foo(), then if the
evaluation of x.f causes a panic, foo must not have been called.
(This is in contrast to an expression like x.f + foo().)
Enforce this stricter ordering.
Fixes#8336.
LGTM=dvyukov
R=golang-codereviews, dvyukov
CC=golang-codereviews, r
https://golang.org/cl/126570043
Update #8525
Some temporary variables that were fully registerized nevertheless had stack space allocated for them because the Addrs were still marked as having associated nodes.
Distribution of stack space reserved for temporary variables while running make.bash (6g):
BEFORE
40.89% 7026 allocauto: 0 to 0
7.83% 1346 allocauto: 0 to 24
7.22% 1241 allocauto: 0 to 8
6.30% 1082 allocauto: 0 to 16
4.96% 853 allocauto: 0 to 56
4.59% 789 allocauto: 0 to 32
2.97% 510 allocauto: 0 to 40
2.32% 399 allocauto: 0 to 48
2.10% 360 allocauto: 0 to 64
1.91% 328 allocauto: 0 to 72
AFTER
48.49% 8332 allocauto: 0 to 0
9.52% 1635 allocauto: 0 to 16
5.28% 908 allocauto: 0 to 48
4.80% 824 allocauto: 0 to 32
4.73% 812 allocauto: 0 to 8
3.38% 581 allocauto: 0 to 24
2.35% 404 allocauto: 0 to 40
2.32% 399 allocauto: 0 to 64
1.65% 284 allocauto: 0 to 56
1.34% 230 allocauto: 0 to 72
LGTM=rsc
R=rsc
CC=dave, dvyukov, golang-codereviews, minux
https://golang.org/cl/126160043
cmd/6g has been doing this for a long time.
Arrays are still problematic on 5g because the addressing
for t[0] where local var t has type [3]uintptr takes the address of t.
That's issue 8125.
Fixes#8123.
LGTM=josharian
R=josharian, dave
CC=golang-codereviews
https://golang.org/cl/102890046
CL 130240043 did this but broke ARM, because
it made newErrorCString start allocating, so we rolled
it back in CL 133810043.
CL 133820043 removed that allocation.
Try again.
Fixes#8405.
LGTM=bradfitz, dave
R=golang-codereviews, bradfitz
CC=dave, golang-codereviews, r
https://golang.org/cl/133830043
It now serves as an example for go generate as well as for yacc.
NOTE: Depends on go generate, which is not yet checked in.
This is a proof of concept of the approach.
That is https://golang.org/cl/125580044.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/125620044
This change broke divmod.go on all arm platforms.
««« original CL description
cmd/gc: change interface representation: only pointers in data word
Note that there are various cleanups that can be made if we keep
this change, but I do not want to start making changes that
depend on this one until the 1.4 cycle closes.
Fixes#8405.
LGTM=r
R=golang-codereviews, adg, r, bradfitz
CC=golang-codereviews, iant
https://golang.org/cl/130240043
»»»
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/133810043
Note that there are various cleanups that can be made if we keep
this change, but I do not want to start making changes that
depend on this one until the 1.4 cycle closes.
Fixes#8405.
LGTM=r
R=golang-codereviews, adg, r, bradfitz
CC=golang-codereviews, iant
https://golang.org/cl/130240043
Fix issue by always appending newline after user input, before
the closing curly bracket. The adjust func is modified to remove
this new newline.
Add test case (it fails before CL, passes after).
Fixes#8411.
LGTM=gri
R=golang-codereviews, bradfitz, josharian, gri
CC=golang-codereviews
https://golang.org/cl/124700043
1) Interpret a comment of the form
//gofmt <flags>
in test files to drive the respective
gofmt command. Eliminates the need to
enumerate all test files in the test
harness.
2) Added -update flag to make it easier
to update test cases.
LGTM=josharian
R=golang-codereviews, josharian
CC=golang-codereviews
https://golang.org/cl/130440043
Update #8527
Fixes, src/cmd/6l/../ld/pcln.c:93:18: runtime error: left shift of negative value -2
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/127440043
This files were added accidentally and are
not required for running the tests (they
are produced by failing tests for easier
debugging).
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/131030044
These are required for chans, semaphores, timers, etc.
LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, rlh, rsc
https://golang.org/cl/123640043
UndefinedBehaviorSanitizer claims it is UB in C:
src/cmd/gc/racewalk.c:422:37: runtime error: member access within null pointer of type 'Node' (aka 'struct Node')
src/cmd/gc/racewalk.c:423:37: runtime error: member access within null pointer of type 'Node' (aka 'struct Node')
LGTM=rsc
R=dave, rsc
CC=golang-codereviews
https://golang.org/cl/125570043
We need to change the interface value representation for
concurrent garbage collection, so that there is no ambiguity
about whether the data word holds a pointer or scalar.
This CL does NOT make any representation changes.
Instead, it removes representation assumptions from
various pieces of code throughout the tree.
The isdirectiface function in cmd/gc/subr.c is now
the only place that decides that policy.
The policy propagates out from there in the reflect
metadata, as a new flag in the internal kind value.
A follow-up CL will change the representation by
changing the isdirectiface function. If that CL causes
problems, it will be easy to roll back.
Update #8405.
LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/129090043
Update #8527
Fixes, cmd/6g/reg.c:847:24: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
LGTM=minux, rsc
R=minux, rsc
CC=dvyukov, golang-codereviews
https://golang.org/cl/129290043
Mallocgc must be atomic wrt GC, but for performance reasons
don't acquirem/releasem on fast path. The code does not have
split stack checks, so it can't be preempted by GC.
Functions like roundup/add are inlined. And onM/racemalloc are nosplit.
Also add debug code that checks these assumptions.
benchmark old ns/op new ns/op delta
BenchmarkMalloc8 20.5 17.2 -16.10%
BenchmarkMalloc16 29.5 27.0 -8.47%
BenchmarkMallocTypeInfo8 31.5 27.6 -12.38%
BenchmarkMallocTypeInfo16 34.7 30.9 -10.95%
LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, rlh, rsc
https://golang.org/cl/123100043
Fixes#8480.
This CL reapplies CL 114420043. This attempt doesn't blow up when encountering hidden symbols.
LGTM=minux
R=minux
CC=golang-codereviews
https://golang.org/cl/128310043
When building golang, the environment variable GOROOT_FINAL can be set
to indicate a different installation location from the build
location. This works fine, except that the goc2c build step embeds
line numbers in the resulting c source files that refer to the build
location, no the install location.
This would not be a big deal, except that in turn the linker uses the
location of runtime/string.goc to embed the gdb script in the
resulting binary and as a net result, the debugger now complains that
the script is outside its load path (it has the install location
configured).
See https://code.google.com/p/go/issues/detail?id=8524 for the full
description.
Fixes#8524.
LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/128230046
The "simpler faster garbage collector" is full of little-endian assumptions.
Instead of trying to correct all the mistakes, just give in and make
everything use bytes.
LGTM=minux
R=minux
CC=dvyukov, golang-codereviews
https://golang.org/cl/124400043
E.g., here's the new "go build" output:
$ go build misc/cgo/errors/issue8442.go
# command-line-arguments
could not determine kind of name for C.issue8442foo
gcc errors for preamble:
misc/cgo/errors/issue8442.go:11:19: error: unknown type name 'UNDEF'
Fixes#8442.
LGTM=iant
R=iant, alex.brainman
CC=golang-codereviews
https://golang.org/cl/129160043
On the machine I'm using, the hardware page size seems to be 64 kB.
Make ELF rounding and mmap quantum 64 kB to match.
Error numbers returned from kernel are positive; do not negate.
Implement stubs for math/big.
LGTM=minux
R=minux
CC=golang-codereviews
https://golang.org/cl/124300043
In cgo, now that recursive calls to typeConv.Type() always work,
we can more robustly calculate the array sizes based on the size
of our element type.
Also, in debug/dwarf, the decision to call zeroType is made
based on a type's usage within a particular struct, but dwarf.Type
values are cached in typeCache, so the modification might affect
uses of the type in other structs. Current compilers don't appear
to share DWARF type entries for "[]foo" and "[0]foo", but they also
don't consistently share type entries in other cases. Arguably
modifying the types is an improvement in some cases, but varying
translated types according to compiler whims seems like a bad idea.
Lastly, also in debug/dwarf, zeroType only needs to rewrite the
top-level dimension, and only if the rest of the array size is
non-zero.
Fixes#8428.
LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/127980043
Those moves might be significant (e.g. narrowing or widening): on Power64,
we don't distinguish between MOVWD and MOVW.
This fixes divmode.go and bug447.go.
LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/125200043
Basically this cleanup replaces all the usage usages of strcmp() == 0,
found by the following command line:
$ grep -R strcmp cmd/dist | grep "0"
LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/123330043
Copy main from 6a. Fixes various things, but the
main thing is the use of the new flag parser.
The go command expects to be able to use -trimpath
and not have it be interpreted as -t rimpath.
LGTM=minux
R=minux
CC=golang-codereviews
https://golang.org/cl/126100043
The file is used by assembly code to define symbols like NOSPLIT.
Having it hidden inside the cmd directory makes it hard to access
outside the standard repository.
Solution: As with a couple of other files used by cgo, copy the
file into the pkg directory and add a -I argument to the assembler
to access it. Thus one can write just
#include "textflag.h"
in .s files.
The names in runtime are not updated because in the boot sequence the
file has not been copied yet when runtime is built. All other .s files
in the repository are updated.
Changes to doc/asm.html, src/cmd/dist/build.c, and src/cmd/go/build.go
are hand-made. The rest are just the renaming done by a global
substitution. (Yay sam).
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/128050043
