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438 Commits

Author SHA1 Message Date
Ian Lance Taylor
754f707f5f cmd/link, cmd/go, cmd/dist: use copy of libgcc.a for internal linking
Change the linker to use a copy of the C compiler support library,
libgcc.a, when doing internal linking.  This will be used to satisfy any
undefined symbols referenced by host objects.

Change the dist tool to copy the support library into a new directory
tree under GOROOT/pkg/libgcc.  This ensures that libgcc is available
even when building Go programs on a system that has no C compiler.  The
C compiler is required when building the Go installation in the first
place, but is not required thereafter.

Change the go tool to not link libgcc into cgo objects.

Correct the linker handling of a weak symbol in an ELF input object to
not always create a new symbol, but to use an existing symbol if there
is one; this is necessary on freebsd-amd64, where libgcc contains a weak
definition of compilerrt_abort_impl.

Fixes #9510.

Change-Id: I1ab28182263238d9bcaf6a42804e5da2a87d8778
Reviewed-on: https://go-review.googlesource.com/16741
Reviewed-by: Russ Cox <rsc@golang.org>
2015-11-14 18:56:17 +00:00
Ian Lance Taylor
880a689124 runtime: don't call msanread when running on the system stack
The runtime is not instrumented, but the calls to msanread in the
runtime can sometimes refer to the system stack.  An example is the call
to copy in stkbucket in mprof.go.  Depending on what C code has done,
the system stack may appear uninitialized to msan.

Change-Id: Ic21705b9ac504ae5cf7601a59189302f072e7db1
Reviewed-on: https://go-review.googlesource.com/16660
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-11-11 06:04:04 +00:00
Ian Lance Taylor
8f3f2ccac0 runtime: mark cgo callback results as written for msan
This is a fix for the -msan option when using cgo callbacks.  A cgo
callback works by writing out C code that puts a struct on the stack and
passes the address of that struct into Go.  The result parameters are
fields of the struct.  The Go code will write to the result parameters,
but the Go code thinks it is just writing into the Go stack, and
therefore won't call msanwrite.  This CL adds a call to msanwrite in the
cgo callback code so that the C knows that results were written.

Change-Id: I80438dbd4561502bdee97fad3f02893a06880ee1
Reviewed-on: https://go-review.googlesource.com/16611
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-11-11 05:58:19 +00:00
Ian Lance Taylor
d841860f43 misc/cgo/test: disable Test10303 for gccgo
When using gccgo it's OK if a pointer passed to C remains on the stack.
Gccgo does not have the clear distinction between C and Go stacks.

Change-Id: I3af9dd6fe078214ab16d9d8dad2d206608d7891d
Reviewed-on: https://go-review.googlesource.com/16774
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
2015-11-11 01:02:35 +00:00
Ian Lance Taylor
9dcc58c3d1 cmd/cgo, runtime: add checks for passing pointers from Go to C
This implements part of the proposal in issue 12416 by adding dynamic
checks for passing pointers from Go to C.  This code is intended to be
on at all times.  It does not try to catch every case.  It does not
implement checks on calling Go functions from C.

The new cgo checks may be disabled using GODEBUG=cgocheck=0.

Update #12416.

Change-Id: I48de130e7e2e83fb99a1e176b2c856be38a4d3c8
Reviewed-on: https://go-review.googlesource.com/16003
Reviewed-by: Russ Cox <rsc@golang.org>
2015-11-10 22:22:10 +00:00
Ian Lance Taylor
2fdff9586b cmd/go: always use --whole-archive for gccgo packages
This is, in effect, what the gc toolchain does.  It fixes cases where Go
code refers to a C global variable; without this, if the global variable
was the only thing visible in the C code, the generated cgo file might
not get pulled in from the archive, leaving the Go variable
uninitialized.

This was reported against gccgo as https://gcc.gnu.org/PR68255 .

Change-Id: I3e769dd174f64050ebbff268fbbf5e6fab1e2a1b
Reviewed-on: https://go-review.googlesource.com/16775
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2015-11-10 20:22:13 +00:00
Michael Hudson-Doyle
07a6cbf58a cmd/dist, cmd/go, misc/cgo/testshared: update testshared and run it on arm
And enable PIE in cmd/go because that's all it seems to take.

Change-Id: Ie017f427ace5e91de333a9f7cba9684c4641dfd5
Reviewed-on: https://go-review.googlesource.com/14222
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-11-10 19:57:30 +00:00
Mohit Agarwal
8e848ba653 misc/cgo/testsanitizers: fix check for existence of clang
The current mechanism fails if clang cannot be executed by the current
user.  Using the `-x` operator for `test` return TRUE if the file is
executable by the user.

Change-Id: I0f3c8dc3880c1ce5a8a833ff3109eb96853184af
Reviewed-on: https://go-review.googlesource.com/16752
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-11-10 03:58:52 +00:00
Ian Lance Taylor
9179c9cb5c cmd/compile: make sure instrumented call has type width
The width of the type of an external variable defined with a type
literal may not be set when the instrumentation pass is run.  There are
two cases in the standard library that fail without the call to dowidth:

../../../src/encoding/base32/base32.go:322: constant -1000000000 overflows uintptr
../../../src/encoding/base32/base32.go:329: constant -1000000000 overflows uintptr
../../../src/encoding/json/encode.go:385: constant -1000000000 overflows uintptr
../../../src/encoding/json/encode.go:387: constant -1000000000 overflows uintptr

Change-Id: I7c3334f7decdb7488595ffe4090cd262d7334283
Reviewed-on: https://go-review.googlesource.com/16331
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2015-11-03 23:42:06 +00:00
Ian Lance Taylor
6326786ce7 misc/cgo/testsanitizers: fix test of whether compiler option works
On older versions of GCC we need to pass a file name before GCC will
report an unrecognized option.

Fixes #13065.

Change-Id: I7ed34c01a006966a446059025f7d10235c649072
Reviewed-on: https://go-review.googlesource.com/16589
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-11-03 23:35:28 +00:00
David Crawshaw
ab7e82ef3b cmd/go: buildmode=c-shared support for linux/arm64
Change-Id: Ic826dc25b5203b2e9fc253d6fe997e4b41de3789
Reviewed-on: https://go-review.googlesource.com/16453
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-10-29 16:25:37 +00:00
Hyang-Ah Hana Kim
26d0b00536 cmd/go: enable android/amd64 build.
For golang/go#10743

Change-Id: Iec047821147a0e28edebf875fefe25993785702b
Reviewed-on: https://go-review.googlesource.com/15994
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-10-28 20:55:13 +00:00
David Crawshaw
b7e4de4b1e cmd/go, cmd/link: -buildmode=pie for linux/amd64
Depends on external linking right now. I have no immediate use for
this, but wanted to check how hard it is to support as android/amd64
is coming and it will require PIE.

Change-Id: I65c6b19159f40db4c79cf312cd0368c2b2527bfd
Reviewed-on: https://go-review.googlesource.com/16072
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-10-23 19:51:55 +00:00
Ian Lance Taylor
029c760c7b cmd/go: if -msan, pass -fsanitize=memory to cgo builds
Also fix the msan_fail test.  It was bogus, since it always aborted one
way or another.

Change-Id: Ic693327d1bddb7bc5c7d859ac047fc93cb9b5b1c
Reviewed-on: https://go-review.googlesource.com/16172
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-10-21 23:52:23 +00:00
Ian Lance Taylor
e7ee268292 cmd/go: add -msan option
The -msan option compiles Go code to use the memory sanitizer.  This is
intended for use when linking with C/C++ code compiled with
-fsanitize=memory.  When memory blocks are passed back and forth between
C/C++ and Go, code in both languages will agree as to whether the memory
is correctly initialized or not, and will report errors for any use of
uninitialized memory.

Change-Id: I2dbdbd26951eacb7d84063cfc7297f88ffadd70c
Reviewed-on: https://go-review.googlesource.com/16169
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-10-21 20:30:23 +00:00
Michael Hudson-Doyle
45c06b27a4 cmd/internal/obj, runtime: add NOFRAME flag to suppress stack frame set up on ppc64x
Replace the confusing game where a frame size of $-8 would suppress the
implicit setting up of a stack frame with a nice explicit flag.

The code to set up the function prologue is still a little confusing but better
than it was.

Change-Id: I1d49278ff42c6bc734ebfb079998b32bc53f8d9a
Reviewed-on: https://go-review.googlesource.com/15670
Reviewed-by: Minux Ma <minux@golang.org>
2015-10-18 22:13:30 +00:00
Hyang-Ah Hana Kim
ee07504d26 misc/cgo/testcshared: use -pie for android-L.
Also, handle the case where 'read' returns EINVAL instead of EBADF
when the descriptor is not ready. (android 4.4.4/cyanogenmod, nexus7)

Change-Id: I56c5949d27303d44a4fd0de38951b85e20cef167
Reviewed-on: https://go-review.googlesource.com/15810
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-10-13 18:35:03 +00:00
Ian Lance Taylor
6e5ccce87f misc/cgo/test: fix go vet warnings
Fixes these warnings from go vet:
buildid_linux.go:25: no formatting directive in Fatalf call
callback.go:180: arg pc[i] for printf verb %p of wrong type: uintptr
env.go:34: possible misuse of unsafe.Pointer
issue7665.go:22: possible misuse of unsafe.Pointer

Change-Id: I83811b9c10c617139713a626b4a34ab05564d4fe
Reviewed-on: https://go-review.googlesource.com/15802
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-10-13 17:53:20 +00:00
Didier Spezia
9c258c6aa6 cmd/cgo: fix panic on references to non-existing C types
cgo panics in Package.rewriteRef for:

var a = C.enum_test(1)
or
p := new(C.enum_test)

when the corresponding enum type is not defined.

Check nil values for Type fields and issue a proper
error instead.

Fixes #11097
Updates #12160

Change-Id: I5821d29097ef0a36076ec5273125b09846c7d832
Reviewed-on: https://go-review.googlesource.com/15264
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-10-05 22:37:07 +00:00
Ian Lance Taylor
f80ff56a7d misc/cgo/testsanitizers: skip test for version of clang before 3.6
I've tested with clang 3.6.  The builder is running 3.5, and fails.

Fixes #12814.

Change-Id: I087fb75c3a24bed7f7fa5e9d7a1444590a316d63
Reviewed-on: https://go-review.googlesource.com/15259
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-10-02 14:17:33 +00:00
Ian Lance Taylor
0c1f0549b8 runtime, runtime/cgo: support using msan on cgo code
The memory sanitizer (msan) is a nice compiler feature that can
dynamically check for memory errors in C code.  It's not useful for Go
code, since Go is memory safe.  But it is useful to be able to use the
memory sanitizer on C code that is linked into a Go program via cgo.
Without this change it does not work, as msan considers memory passed
from Go to C as uninitialized.

To make this work, change the runtime to call the C mmap function when
using cgo.  When using msan the mmap call will be intercepted and marked
as returning initialized memory.

Work around what appears to be an msan bug by calling malloc before we
call mmap.

Change-Id: I8ab7286d7595ae84782f68a98bef6d3688b946f9
Reviewed-on: https://go-review.googlesource.com/15170
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-09-30 22:17:55 +00:00
Ian Lance Taylor
ffd7d31787 runtime: unblock special glibc signals on each thread
Glibc uses some special signals for special thread operations.  These
signals will be used in programs that use cgo and invoke certain glibc
functions, such as setgid.  In order for this to work, these signals
need to not be masked by any thread.  Before this change, they were
being masked by programs that used os/signal.Notify, because it
carefully masks all non-thread-specific signals in all threads so that a
dedicated thread will collect and report those signals (see ensureSigM
in signal1_unix.go).

This change adds the two glibc special signals to the set of signals
that are unmasked in each thread.

Fixes #12498.

Change-Id: I797d71a099a2169c186f024185d44a2e1972d4ad
Reviewed-on: https://go-review.googlesource.com/14297
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-09-14 21:59:54 +00:00
Shenghou Ma
0b5bcf53ee runtime/cgo: explicitly link msvcrt on windows
It's because runtime links to ntdll, and ntdll exports a couple
incompatible libc functions. We must link to msvcrt first and
then try ntdll.

Fixes #12030.

Change-Id: I0105417bada108da55f5ae4482c2423ac7a92957
Reviewed-on: https://go-review.googlesource.com/14472
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-09-12 08:34:52 +00:00
Rob Pike
67ddae87b9 all: use one 'l' when cancelling everywhere except Solaris
Fixes #11626.

Change-Id: I1b70c0844473c3b57a53d7cca747ea5cdc68d232
Reviewed-on: https://go-review.googlesource.com/14526
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-09-11 18:31:51 +00:00
Michael Hudson-Doyle
5cbca8d84b cmd/internal/ld: put read-only relocated data into .data.rel.ro when making a shared object
Currently Go produces shared libraries that cannot be shared between processes
because they have relocations against the text segment (not text section). This
fixes this by moving some data to sections with magic names recognized by the
static linker.

The change in genasmsym to add STYPELINK to the switch should fix things on
darwin/arm64.

Fixes #10914
Updates #9210

Change-Id: Iab4a6678dd04cec6114e683caac5cf31b1063309
Reviewed-on: https://go-review.googlesource.com/14306
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-09-08 23:34:16 +00:00
Dave Cheney
e49b2460a4 Revert "cmd/internal/ld: put read-only relocated data into .data.rel.ro when making a shared object"
This reverts commit 2c2cbb69c8.

Broke darwin/arm64

Change-Id: Ibd2dea475d6ce6a8b4b40e2da19a83fc0514025d
Reviewed-on: https://go-review.googlesource.com/14301
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-09-04 19:47:36 +00:00
Michael Hudson-Doyle
2c2cbb69c8 cmd/internal/ld: put read-only relocated data into .data.rel.ro when making a shared object
Currently Go produces shared libraries that cannot be shared between processes
because they have relocations against the text segment (not text section). This
fixes this by moving some data to sections with magic names recognized by the
static linker.

Fixes #10914
Updates #9210

Change-Id: I7178daadc0ae87953d5a084aa3d580f4e3b46d47
Reviewed-on: https://go-review.googlesource.com/10300
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-09-04 05:25:10 +00:00
Michael Hudson-Doyle
abab21b1d1 misc/cgo/testshared: do not run gccgo tests when gccgo is too old
Fixes #12083

Change-Id: I8256739b33cf08d84dec23120d527667de2e6eea
Reviewed-on: https://go-review.googlesource.com/13822
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-08-26 01:19:55 +00:00
Ian Lance Taylor
7904946eeb cmd/cgo: discard trailing zero-sized fields in a non-empty C struct
In order to fix issue #9401 the compiler was changed to add a padding
byte to any non-empty Go struct that ends in a zero-sized field.  That
causes the Go version of such a C struct to have a different size than
the C struct, which can considerable confusion.  Change cgo so that it
discards any such zero-sized fields, so that the Go and C structs are
the same size.

This is a change from previous releases, in that it used to be
possible to refer to a zero-sized trailing field (by taking its
address), and with this change it no longer is.  That is unfortunate,
but something has to change.  It seems better to visibly break
programs that do this rather than to silently break programs that rely
on the struct sizes being the same.

Update #9401.
Fixes #11925.

Change-Id: I3fba3f02f11265b3c41d68616f79dedb05b81225
Reviewed-on: https://go-review.googlesource.com/12864
Reviewed-by: Russ Cox <rsc@golang.org>
2015-07-30 15:55:25 +00:00
Ingo Krabbe
2e38b3511a misc/cgo/testsovar: needs the extern keyword to export variables on non-windows platforms
Change-Id: I87fa25214fbf24469148a63f4e1e61e261105c16
Reviewed-on: https://go-review.googlesource.com/12470
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-07-21 18:10:57 +00:00
Michael Hudson-Doyle
1125cd4997 cmd/compile: define func value symbols at declaration
This is mostly Russ's https://golang.org/cl/12145 but with some extra fixes to
account for the fact that function declarations without implementations now
break shared libraries, and including my test case.

Fixes #11480.

Change-Id: Iabdc2934a0378e5025e4e7affadb535eaef2c8f1
Reviewed-on: https://go-review.googlesource.com/12340
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-07-20 00:50:46 +00:00
Ian Lance Taylor
7c767fd709 misc/cgo/testshared: unset GOBIN during test
Fixes #11273.

Change-Id: I409b6c4168711913076439036d65e8639ca3b06f
Reviewed-on: https://go-review.googlesource.com/12073
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-07-12 18:06:34 +00:00
Brad Fitzpatrick
2ae77376f7 all: link to https instead of http
The one in misc/makerelease/makerelease.go is particularly bad and
probably warrants rotating our keys.

I didn't update old weekly notes, and reverted some changes involving
test code for now, since we're late in the Go 1.5 freeze. Otherwise,
the rest are all auto-generated changes, and all manually reviewed.

Change-Id: Ia2753576ab5d64826a167d259f48a2f50508792d
Reviewed-on: https://go-review.googlesource.com/12048
Reviewed-by: Rob Pike <r@golang.org>
2015-07-11 14:36:33 +00:00
Russ Cox
4e61c516f4 cmd/cgo: fix a problem with 'go build -compiler gccgo'
Port of https://golang.org/cl/154360045 to Git.
Original author is Xia Bin <snyh@snyh.org> (already a contributor).

Fixes #8945.

Change-Id: I28bcaf3348794202ca59fbc3466bd7b9670030e4
Reviewed-on: https://go-review.googlesource.com/11658
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-06-29 15:15:59 +00:00
Aaron Jacobs
8628688304 Fix several out of date references to 4g/5g/6g/8g/9g.
Change-Id: Ifb8e4e13c7778a7c0113190051415e096f5db94f
Reviewed-on: https://go-review.googlesource.com/11390
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Andrew Gerrand <adg@golang.org>
2015-06-26 03:38:21 +00:00
Mikio Hara
fe1cecfaec misc/cgo/testcshared: don't leave garbages after test
Change-Id: I668b18b1e6901c59cf170e0c1cde9a3923c0cb13
Reviewed-on: https://go-review.googlesource.com/11472
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-06-25 19:54:56 +00:00
Srdjan Petrovic
cc6554f750 cmd/link/internal/ld, cmd/go: -buildmode=c-shared support for darwin/amd64
All of the heavy-lifting was done by minux@, with his external-linking support
for darwin/arm64: golang.org/cl/8781

Change-Id: I7c9fbc19246f418c065c92fb2c13c00026ff0f82
Reviewed-on: https://go-review.googlesource.com/11127
Run-TryBot: Srdjan Petrovic <spetrovic@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-06-19 20:28:01 +00:00
Alex Brainman
9d968cb47b runtime: rename cgocall_errno and asmcgocall_errno into cgocall and asmcgocall
Change-Id: I5917bea8bb35b0e725dcc56a68f3a70137cfc180
Reviewed-on: https://go-review.googlesource.com/9387
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-06-19 01:47:11 +00:00
Ian Lance Taylor
a2aaede366 misc/cgo/testshared: make sure rebuilds occur as expected
Adjust timestamps in TestABIChecking to make sure that the library and
executable are rebuilt when expected.

Change-Id: I3288c254ba8201b5b4255347b0cb056fa0908657
Reviewed-on: https://go-review.googlesource.com/11128
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Yves Junqueira <yves.junqueira@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-06-17 14:55:39 +00:00
Alex Brainman
6428a8b437 cmd/dist: add new misc/cgo/testsovar test
This change reintroduces CL 8523. CL 8523 was reverted because
it broke darwin and netbsd builds. Now that this test is part
of "go tool dist test" command we could skip OSes that fail.

Updates #10360

Change-Id: Iaaeb5b800126492f36415a439c333a218fe4ab67
Reviewed-on: https://go-review.googlesource.com/11119
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-06-17 02:33:40 +00:00
Michael Hudson-Doyle
a5f57d7950 cmd/link: when reading symbols from a shared library, allow duplicates when they are both in bss
This makes the behaviour match what happens when duplicate symbols are read
from regular object files and fixes errors about cgoAlwaysFalse when linking
an executable that uses cgo against a shared library.

Change-Id: Ibb8cd8fe3f7813cde504b7483f1e857868d7e063
Reviewed-on: https://go-review.googlesource.com/11117
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-06-16 22:33:36 +00:00
Michael Hudson-Doyle
12b05bf8fd cmd/go: support -buildmode=shared with gccgo
Change-Id: Id93b8ab42fa311ce32209734ec9a0813f8736e25
Reviewed-on: https://go-review.googlesource.com/9914
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
2015-06-16 01:43:29 +00:00
Russ Cox
2c2770c3d4 cmd/cgo: make sure pointers passed to C escape to heap
Fixes #10303.

Change-Id: Ia68d3566ba3ebeea6e18e388446bd9b8c431e156
Reviewed-on: https://go-review.googlesource.com/10814
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-06-15 17:39:53 +00:00
Alex Brainman
202ef487fe cmd/dist: convert testso test into Go
I would like to re-apply reverted http://golang.org/cl/8523.
Reverted tests still fail in some environments (see issue #10360).
It is easier to run tests selectively when in Go.
This CL prepares for the changes.

Updates #10360

Change-Id: Iefeb1d71cb3d1cfa653a6ccd9f6e35686c0c5b24
Reviewed-on: https://go-review.googlesource.com/10608
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-06-12 04:33:50 +00:00
Russ Cox
7e27625e25 cmd/go, cmd/link: use "Go" not "GO" as ELF note identifier
Change-Id: I038e892725836ab7718f7638e8ad5712953f2cb5
Reviewed-on: https://go-review.googlesource.com/10704
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-06-05 03:59:46 +00:00
Michael Hudson-Doyle
c949cff6a7 cmd/internal/ld: do not depend on local symbols to read a type's gcdata
We already read the address of a gcmask/gcprog out of the type data, but I
didn't know how many bytes to read. But it turns out that it's easy to
calculate, so change to do that. This means that we no longer depend on the
local symbols being present, allowing me to strip the shared libraries for
distribution and make them a lot smaller.

As a bonus, this makes LSym another 24 bytes smaller, down to 296 bytes now.

Change-Id: I379d359e28d63afae6753efd23efdf1fbb716992
Reviewed-on: https://go-review.googlesource.com/10377
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-05-27 14:11:16 +00:00
Michael Hudson-Doyle
bcc1870fcf cmd/internal/ld: store the libraries a shared library was linked against in a note
The motivation for this is the innocuous looking test case that is added. This
creates a stack exe -> libdep2.so -> libdep.so -> libruntime.so. The problem
comes from the fact that a function from libdep.so gets inlined all the way
into exe. This (unsurprisingly) means that the object file for exe references
symbols from libdep.so, which means that -ldep needs to be passed when linking
exe and it isn't. The fix is simply to pass it -- there is no harm in passing
it when it's not needed.

The thing is, it's not clear at all in the current code to see how the linker
can know that libdep2 is linked against libdep. It could look through the
DT_NEEDED entries in libdep2 and try to guess which are Go libraries, but it
feels better to be explicit. So this adds another SHT_NOTE section that lists
the shared libraries a shared library was linked against, and makes sure the
complete set of depended upon shared libraries is passed to the external
linker.

Change-Id: I79aa6f98b4db4721d657a7eb7b7f062269bf49e2
Reviewed-on: https://go-review.googlesource.com/10376
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-05-27 13:25:32 +00:00
Michael Hudson-Doyle
65518032b9 cmd/link/internal/ld: put abi hash into a note
This makes for a more stable API for tools (including cmd/link itself) to
extract the abi hash from a shared library and makes it possible at all for a
library that has had the local symbol table removed.

The existing note-writing code only supports writing notes into the very start
of the object file so they are easy to find in core dumps. This doesn't apply
to the "go" notes and means that all notes have to fit into a fixed size
budget. That's annoying now we have more notes (and the next CL will add
another one) so this does a little bit of work to make adding notes that do not
have to go at the start of the file easier and moves the writing of the package
list note over to that mechanism, which lets me revert a hack that increased
the size budget mentioned above for -buildmode=shared builds.

Change-Id: I6077a68d395c8a2bc43dec8506e73c71ef77d9b9
Reviewed-on: https://go-review.googlesource.com/10375
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-05-27 04:48:29 +00:00
Michael Hudson-Doyle
9262e2183b misc/cgo/testshared: do not capture output of go commands in verbose mode
Change-Id: I8694ee5e5642c31815ae63cd414a3b1fcd9c95b0
Reviewed-on: https://go-review.googlesource.com/10411
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-05-27 04:46:29 +00:00
Elias Naur
22e4b8167f misc/cgo/test: fix build for CC=clang
Fix build error when CL=clang introduced by CL 10173.

Change-Id: I8edf210787a9803280c0779ff710c7e634a820d6
Reviewed-on: https://go-review.googlesource.com/10341
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-05-22 22:54:24 +00:00
Elias Naur
84cfba17c2 runtime: don't always unblock all signals
Ian proposed an improved way of handling signals masks in Go, motivated
by a problem where the Android java runtime expects certain signals to
be blocked for all JVM threads. Discussion here

https://groups.google.com/forum/#!topic/golang-dev/_TSCkQHJt6g

Ian's text is used in the following:

A Go program always needs to have the synchronous signals enabled.
These are the signals for which _SigPanic is set in sigtable, namely
SIGSEGV, SIGBUS, SIGFPE.

A Go program that uses the os/signal package, and calls signal.Notify,
needs to have at least one thread which is not blocking that signal,
but it doesn't matter much which one.

Unix programs do not change signal mask across execve.  They inherit
signal masks across fork.  The shell uses this fact to some extent;
for example, the job control signals (SIGTTIN, SIGTTOU, SIGTSTP) are
blocked for commands run due to backquote quoting or $().

Our current position on signal masks was not thought out.  We wandered
into step by step, e.g., http://golang.org/cl/7323067 .

This CL does the following:

Introduce a new platform hook, msigsave, that saves the signal mask of
the current thread to m.sigsave.

Call msigsave from needm and newm.

In minit grab set up the signal mask from m.sigsave and unblock the
essential synchronous signals, and SIGILL, SIGTRAP, SIGPROF, SIGSTKFLT
(for systems that have it).

In unminit, restore the signal mask from m.sigsave.

The first time that os/signal.Notify is called, start a new thread whose
only purpose is to update its signal mask to make sure signals for
signal.Notify are unblocked on at least one thread.

The effect on Go programs will be that if they are invoked with some
non-synchronous signals blocked, those signals will normally be
ignored.  Previously, those signals would mostly be ignored.  A change
in behaviour will occur for programs started with any of these signals
blocked, if they receive the signal: SIGHUP, SIGINT, SIGQUIT, SIGABRT,
SIGTERM.  Previously those signals would always cause a crash (unless
using the os/signal package); with this change, they will be ignored
if the program is started with the signal blocked (and does not use
the os/signal package).

./all.bash completes successfully on linux/amd64.

OpenBSD is missing the implementation.

Change-Id: I188098ba7eb85eae4c14861269cc466f2aa40e8c
Reviewed-on: https://go-review.googlesource.com/10173
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-05-22 20:24:08 +00:00
Shenghou Ma
c013417a45 misc/cgo/testshared: when checking for RPATHs also look for DT_RUNPATH
On my systems, ld -rpath sets DT_RUNPATH instead of DT_RPATH.

Change-Id: I5047e795fb7ef9336f5fa13ba24bb6245c0b0582
Reviewed-on: https://go-review.googlesource.com/10260
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-05-19 23:07:45 +00:00
Michael Hudson-Doyle
362a40e37d misc/cgo/testshared: rewrite in Go
And fix to work on filesystems with only 1s resolution.

Fixes #10724

Change-Id: Ia07463f090b4290fc27f5953fa94186463d7afc7
Reviewed-on: https://go-review.googlesource.com/9768
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-05-18 18:40:05 +00:00
Hyang-Ah (Hana) Kim
647026a16b misc/cgo/testcshared: remove use of 'env'.
'env' command is not available on some android devices.

Change-Id: I68b1152ef7ea248c8e80c7f71e97da76e3ec6394
Reviewed-on: https://go-review.googlesource.com/9999
Reviewed-by: Minux Ma <minux@golang.org>
2015-05-13 21:31:03 +00:00
Hyang-Ah (Hana) Kim
a4f4a46c28 misc/cgo/testcshared: fix test for android.
On android the generated header files are located in
pkg/$(go env GOOS)_$(go env GOARCH)_testcshared.
The test was broken since https://go-review.googlesource.com/9798.

The installation path differs based on codegenArgs
(around src/cmd/go/build.go line 389), and the codegenArgs
is platform dependent.

Change-Id: I01ae9cb957fb7676e399f3b8c067f24c5bd20b9d
Reviewed-on: https://go-review.googlesource.com/9980
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-05-12 23:46:33 +00:00
Michael Hudson-Doyle
77fc03f4cd cmd/internal/ld, runtime: abort on shared library ABI mismatch
This:

1) Defines the ABI hash of a package (as the SHA1 of the __.PKGDEF)
2) Defines the ABI hash of a shared library (sort the packages by import
   path, concatenate the hashes of the packages and SHA1 that)
3) When building a shared library, compute the above value and define a
   global symbol that points to a go string that has the hash as its value.
4) When linking against a shared library, read the abi hash from the
   library and put both the value seen at link time and a reference
   to the global symbol into the moduledata.
5) During runtime initialization, check that the hash seen at link time
   still matches the hash the global symbol points to.

Change-Id: Iaa54c783790e6dde3057a2feadc35473d49614a5
Reviewed-on: https://go-review.googlesource.com/8773
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
2015-05-12 01:30:40 +00:00
Michael Hudson-Doyle
be0cb9224b runtime: fix addmoduledata to follow the platform ABI
addmoduledata is called from a .init_array function and need to follow the
platform ABI. It contains accesses to global data which are rewritten to use
R15 by the assembler, and as R15 is callee-save we need to save it.

Change-Id: I03893efb1576aed4f102f2465421f256f3bb0f30
Reviewed-on: https://go-review.googlesource.com/9941
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-05-12 00:50:32 +00:00
Ian Lance Taylor
e45aebd6dd cmd/go: install headers for c-archive/c-shared cgo exports
When
  using -buildmode=c-archive or c-shared, and
  when installing packages that use cgo, and
  when those packages export some functions via //export comments,
then
  for each such package, install a pkg.h header file that declares the
  functions.

This permits C code to #include the header when calling the Go
functions.

This is a little awkward to use when there are multiple packages that
export functions, as you have to "go install" your c-archive/c-shared
object and then pull it out of the package directory.  When compiling
your C code you have to -I pkg/$GOOS_$GOARCH.  I haven't thought of
any more convenient approach.  It's simpler when only the main package
has exported functions.

When using c-shared you currently have to use a _shared suffix in the
-I option; it would be nice to fix that somehow.

Change-Id: I5d8cf08914b7d3c2b194120c77791d2732ffd26e
Reviewed-on: https://go-review.googlesource.com/9798
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-05-07 17:39:56 +00:00
Aram Hăvărneanu
2230e9d24b misc/cgo: add various solaris build lines
Change-Id: Ifd9ac7f5300232fb83c6350a787b5803adb96b48
Reviewed-on: https://go-review.googlesource.com/8263
Reviewed-by: Minux Ma <minux@golang.org>
2015-05-06 11:38:08 +00:00
Michael Hudson-Doyle
a1858e9cf0 cmd/go: rebuild stale shared objects before linking against them.
This changes the action graph when shared libraries are involved to always have
an action for the shared library (which does nothing when the shared library
is up to date).

Change-Id: Ibbc70fd01cbb3f4e8c0ef96e62a151002d446144
Reviewed-on: https://go-review.googlesource.com/8934
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-05-05 22:08:25 +00:00
Dave Cheney
ccaaf1f134 misc/cgo/testcshared, misc/cgo/testshared: fix clang warnings and errors
Fix several warnings generated on the linux-amd64-clang builder
and make it clear to clang that -znow is a linker only flag.

Tested with

    env CC=clang-3.5 ./all.bash
    env CC=gcc-4.8 ./all.bash

Change-Id: I5ca7366ba8bf6221a36d25a2157dda4b4f3e16fa
Reviewed-on: https://go-review.googlesource.com/9523
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-30 17:08:15 +00:00
Michael Hudson-Doyle
0774f6dbfd misc/cgo/testshared: add basic test for -buildmode=shared/-linkshared
Just a first basic test, I'll extend this to test more but want to get an
opinion on basic approach first.

Change-Id: Idab9ebd7d9960b000b81a01a1e53258bf4bce755
Reviewed-on: https://go-review.googlesource.com/9386
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
2015-04-29 23:47:47 +00:00
Ian Lance Taylor
e2b6cebcd6 misc/cgo/test/issue9400: fix to build with gccgo
This doesn't test much with gccgo, but at least it builds now, and the
test does, unsurprisingly, pass.  A proper test would require adding
assembly files in GCC syntax for all platforms that gccgo supports,
which would be infeasible.

Also added copyright headers to the asm files.

Change-Id: Icea5af29d7d521a0681506ddb617a79705b76d33
Reviewed-on: https://go-review.googlesource.com/9417
Reviewed-by: Minux Ma <minux@golang.org>
2015-04-29 16:57:13 +00:00
Hyang-Ah Hana Kim
e9a89b80b6 misc/cgo/testcshared: make test.bash resilient against noise.
Instead of comparing against the entire output that may include
verbose warning messages, use the last line of the output and check
it includes the expected success message (PASS).

Change-Id: Iafd583ee5529a8aef5439b9f1f6ce0185e4b1331
Reviewed-on: https://go-review.googlesource.com/9304
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-04-24 18:32:24 +00:00
Hyang-Ah Hana Kim
8566979972 misc/cgo/testcshared: add a c-shared test for android/arm.
- main3.c tests main.main is exported when compiled for GOOS=android.
- wait longer for main2.c (it's slow on android/arm)
- rearranged test.bash

Fixes #10070.

Change-Id: I6e5a98d1c5fae776afa54ecb5da633b59b269316
Reviewed-on: https://go-review.googlesource.com/9296
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
2015-04-24 16:32:31 +00:00
Srdjan Petrovic
5c8fbc6f1e runtime: signal forwarding
Forward signals to signal handlers installed before Go installs its own,
under certain circumstances.  In particular, as iant@ suggests, signals are
forwarded iff:
   (1) a non-SIG_DFL signal handler existed before Go, and
   (2) signal is synchronous (i.e., one of SIGSEGV, SIGBUS, SIGFPE), and
   	(3a) signal occured on a non-Go thread, or
   	(3b) signal occurred on a Go thread but in CGo code.

Supported only on Linux, for now.

Change-Id: I403219ee47b26cf65da819fb86cf1ec04d3e25f5
Reviewed-on: https://go-review.googlesource.com/8712
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-24 05:19:39 +00:00
Ian Lance Taylor
e589e08014 misc/cgo/testcshared: add c-shared test with no exports
The purpose of this test is to make sure that -buildmode=c-shared
works even when the shared library can be built without invoking cgo.

Change-Id: Id6f95af755992b209aff770440ca9819b74113ab
Reviewed-on: https://go-review.googlesource.com/9166
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-04-21 20:50:23 +00:00
David Crawshaw
98f610fe09 misc/cgo/testcarchive: enable test on darwin/arm
Change-Id: I0d3f9841500e0a41f1c427244869bf3736a31e18
Reviewed-on: https://go-review.googlesource.com/9075
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
2015-04-20 15:16:16 +00:00
David Crawshaw
c5befcf0a7 misc/cgo/testcarchive: check that os.Args is set
Change-Id: I4278abca9d2a8f25149fa8935a93d32e7d04a43a
Reviewed-on: https://go-review.googlesource.com/9050
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-04-17 22:29:51 +00:00
Hyang-Ah Hana Kim
92189a2be2 misc/cgo/testcshared: test -buildmode=c-shared
Followed the same test pattern in misc/cgo/testcarchive.

Change-Id: I2f863b5c24a28f0b38b0128ed3e8a92c17fb5b9f
Reviewed-on: https://go-review.googlesource.com/8985
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-17 16:16:44 +00:00
Russ Cox
6a2b0c0b6d runtime: delete cgo_allocate
This memory is untyped and can't be used anymore.
The next version of SWIG won't need it.

Change-Id: I592b287c5f5186975ee09a9b28d8efe3b57134e7
Reviewed-on: https://go-review.googlesource.com/8956
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-17 01:30:47 +00:00
Shenghou Ma
110fa22c45 misc/cgo/test: skip issue3261 test on darwin/arm64
Because there is no libgcc.

Change-Id: I3b3f80791a1db4c2b7318f81a115972cd2237f07
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/8786
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-04-16 13:00:47 +00:00
David Crawshaw
3b22ffc07e runtime: make cgocallback wait on package init
With the new buildmodes c-archive and c-shared, it is possible for a
cgo call to come in early in the lifecycle of a Go program. Calls
before the runtime has been initialized are caught by
_cgo_wait_runtime_init_done. However a call can come in after the
runtime has initialized, but before the program's package init
functions have finished running.

To avoid this cgocallback checks m.ncgo to see if we are on a thread
running Go. If not, we may be a foreign thread and it blocks until
main_init is complete.

Change-Id: I7a9f137fa2a40c322a0b93764261f9aa17fcf5b8
Reviewed-on: https://go-review.googlesource.com/8897
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
2015-04-14 13:39:02 +00:00
David Crawshaw
8543cc5635 misc/cgo/testcarchive: avoid bad pointer passing
Change-Id: Ifbcc0eb24834f2f7d3b160d1dc911209723d9797
Reviewed-on: https://go-review.googlesource.com/8863
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-13 19:00:52 +00:00
David Crawshaw
fdab2f92ea misc/cgo/testcarchive: test -buildmode=c-archive
Change-Id: I1668a6885c45180ff88fe673d04cec7eba395ee7
Reviewed-on: https://go-review.googlesource.com/8861
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-13 18:31:07 +00:00
Shenghou Ma
6508518849 misc/cgo/test/issue9400: add arm64 implementation
Change-Id: I309e3df7608b9eef9339196fdc50dedf5f9439f4
Reviewed-on: https://go-review.googlesource.com/8451
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
2015-04-08 09:08:40 +00:00
Alex Brainman
f8bcebe47c Revert "misc/cgo/testso: add test for fixed issue 4339"
This reverts commit 9fa9f966e9.

The change has broken darwin and netbsd builders. It needs to be tested properly.

Change-Id: Id9e2d30caa8764c362c9f33890015dfc1aae0dab
Reviewed-on: https://go-review.googlesource.com/8527
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
2015-04-07 11:50:28 +00:00
Alex Brainman
9fa9f966e9 misc/cgo/testso: add test for fixed issue 4339
Update #4339.

Change-Id: Ic1a7535562b8b824ba166777725f7ba5b9623d77
Reviewed-on: https://go-review.googlesource.com/8523
Run-TryBot: Minux Ma <minux@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-04-07 06:25:33 +00:00
Alex Brainman
d2918cbcaa cmd/dist: execute misc/cgo/testso again on windows
Fixes #10072

Change-Id: I1f73c8829a89144d49433a36a4e64223c74af954
Reviewed-on: https://go-review.googlesource.com/6585
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-03-04 22:38:48 +00:00
Brad Fitzpatrick
d5f690609f build: convert run.bash, run.bat, and run.rc into a Go program
This will enable test sharding over multiple VMs, to speed trybot answers.

Update #10029

Change-Id: Ie277c6459bc38005e4d6af14d22effeaa0a4667e
Reviewed-on: https://go-review.googlesource.com/6531
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
2015-03-03 23:22:11 +00:00
Rob Pike
e190e27143 [dev.cc] misc/cgo/test: fix PC reference in arm assembler
Use R15.
May fix build.

Change-Id: Ia25b0936c5aab2a427f8e6531688c3e537fbfdd0
Reviewed-on: https://go-review.googlesource.com/5070
Reviewed-by: Russ Cox <rsc@golang.org>
2015-02-17 21:42:27 +00:00
Péter Surányi
9b6ccb1323 all: don't refer to code.google.com/p/go{,-wiki}/
Only documentation / comment changes. Update references to
point to golang.org permalinks or go.googlesource.com/go.
References in historical release notes under doc are left as is.

Change-Id: Icfc14e4998723e2c2d48f9877a91c5abef6794ea
Reviewed-on: https://go-review.googlesource.com/4060
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-02-06 14:41:47 +00:00
Shenghou Ma
5b806e58e2 misc/cgo/test: skip test7978 when using unsupported compilers
On Darwin/ARM, because libSystem doesn't provide functions for
__sync_fetch_and_add, and only clang can inline that function,
skip the test when building with GCC.

Change-Id: Id5e9d8f9bbe1e6bcb2f381f0f66cf68aa95277c7
Reviewed-on: https://go-review.googlesource.com/2125
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-02-06 05:49:47 +00:00
Austin Clements
36f456c789 misc/cgo: skip testso on ppc64
This test requires external linking, but we don't yet implement
external linking on ppc64 (tracked in issue #8912).  Disable the test
on ppc64 until external linking is implemented.

This makes all.bash pass on ppc64le.

Change-Id: I741498d4d9321607e7a65792a33faf8187bd18e4
Reviewed-on: https://go-review.googlesource.com/2908
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2015-01-16 19:45:28 +00:00
Shenghou Ma
16993f2485 cmd/cgo: also rewrite C.var in selector expressions
While we're here, rename TestIssue7234 to Test7234 for consistency
with other tests.

Fixes #9557.

Change-Id: I22b0a212b31e7b4f199f6a70deb73374beb80f84
Reviewed-on: https://go-review.googlesource.com/2654
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-01-12 21:48:57 +00:00
Matthew Dempsky
b2aab72d9a cmd/cgo: remove obsolete -cdefs flag
Now that there's no 6c compiler anymore, there's no need for cgo to
generate C headers that are compatible with it.

Fixes #9528

Change-Id: I43f53869719eb9a6065f1b39f66f060e604cbee0
Reviewed-on: https://go-review.googlesource.com/2482
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-01-07 22:49:59 +00:00
Russ Cox
949dd10222 misc/cgo: disable TestAllocateFromC in wbshadow mode
This test is doing pointer graph manipulation from C, and we
cannot support that with concurrent GC. The wbshadow mode
correctly diagnoses missing write barriers.

Disable the test in that mode for now. There is a bigger issue
behind it, namely SWIG, but for now we are focused on making
all.bash pass with wbshadow enabled.

Change-Id: I55891596d4c763e39b74082191d4a5fac7161642
Reviewed-on: https://go-review.googlesource.com/2346
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
2015-01-06 22:22:59 +00:00
Russ Cox
df027aceb9 reflect: add write barriers
Use typedmemmove, typedslicecopy, and adjust reflect.call
to execute the necessary write barriers.

Found with GODEBUG=wbshadow=2 mode.
Eventually that will run automatically, but right now
it still detects other missing write barriers.

Change-Id: Iec5b5b0c1be5589295e28e5228e37f1a92e07742
Reviewed-on: https://go-review.googlesource.com/2312
Reviewed-by: Keith Randall <khr@golang.org>
2015-01-06 00:28:31 +00:00
Shenghou Ma
04cf881fbe misc/cgo/test: get rid of the backdoor package
For Go 1.5, we can use go:linkname rather than assembly thunk for gc.
Gccgo already has support for //extern.

Change-Id: I5505aa247dd5b555112f7261ed2f192c81cf0bdf
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/1888
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2014-12-24 00:18:21 +00:00
Austin Clements
200e7bf6b1 misc/cgo: fix issue 9400 test on 386
issue9400_linux.go did not build on 386 because it used a constant
that was larger than a 32-bit int in a ... argument.  Fix this by
casting the constant to uint64 (to match how the constant is being
used).

Change-Id: Ie8cb64c3910382a41c7852be7734a62f0b2d5a21
Reviewed-on: https://go-review.googlesource.com/2060
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2014-12-23 02:22:50 +00:00
Austin Clements
675eb72c28 runtime: run libc SIGSETXID and SIGCANCEL handlers on signal stack
These signals are used by glibc to broadcast setuid/setgid to all
threads and to send pthread cancellations.  Unlike other signals, the
Go runtime does not intercept these because they must invoke the libc
handlers (see issues #3871 and #6997).  However, because 1) these
signals may be issued asynchronously by a thread running C code to
another thread running Go code and 2) glibc does not set SA_ONSTACK
for its handlers, glibc's signal handler may be run on a Go stack.
Signal frames range from 1.5K on amd64 to many kilobytes on ppc64, so
this may overflow the Go stack and corrupt heap (or other stack) data.

Fix this by ensuring that these signal handlers have the SA_ONSTACK
flag (but not otherwise taking over the handler).

This has been a problem since Go 1.1, but it's likely that people
haven't encountered it because it only affects setuid/setgid and
pthread_cancel.

Fixes #9600.

Change-Id: I6cf5f5c2d3aa48998d632f61f1ddc2778dcfd300
Reviewed-on: https://go-review.googlesource.com/1887
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2014-12-23 01:33:36 +00:00
Ian Lance Taylor
421c01706f misc/cgo/test: skip test7978 when using gccgo
Gccgo can only get a backtrace for the currently running thread, which
means that it can only get a backtrace for goroutines currently running
Go code.  When a goroutine is running C code, gccgo has no way to stop
it and get the backtrace.  This test is all about getting a backtrace
of goroutines running C code, so it can't work for gccgo.

Change-Id: I2dff4403841fb544da7396562ab1193875fc14c3
Reviewed-on: https://go-review.googlesource.com/1904
Reviewed-by: Minux Ma <minux@golang.org>
2014-12-20 02:38:38 +00:00
Ian Lance Taylor
35dc312e72 misc/cgo/test/backdoor: add gc build tag for thunk.s
Change-Id: I6be5f610af5c56131a9d887569919372bab1d02c
Reviewed-on: https://go-review.googlesource.com/1903
Reviewed-by: Minux Ma <minux@golang.org>
2014-12-20 02:08:50 +00:00
Shenghou Ma
026b5bbc8b misc/cgo/test: skip test8694 on ARM.
LGTM=dave, bradfitz, rsc
R=golang-codereviews, dave, bradfitz, rsc
CC=golang-codereviews
https://golang.org/cl/185130043
2014-12-11 17:34:10 +11:00
Alan Donovan
182ec4395e misc/cgo/test: fix freebsd test failure by moving test to its own package.
(The assertion depends on a per-package gensym counter whose
value varies based on what else is in the package.)

LGTM=khr
R=khr, rsc
CC=golang-codereviews
https://golang.org/cl/169930043
2014-11-03 13:41:03 -05:00
Benoit Sigoure
8e01fc7e9b misc: Increase issue 6997's test timeout to prevent spurious failures.
On heavily loaded build servers, a 5 second timeout is too aggressive,
which causes this test to fail spuriously.

LGTM=iant
R=iant
CC=golang-codereviews, sqweek
https://golang.org/cl/170850043
2014-11-01 08:28:09 -07:00
Alan Donovan
a14ae44517 misc/cgo/test: fix bad C test code that fails on some configurations
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/169800043
2014-10-30 14:08:55 -04:00
Alan Donovan
09f6f05c1f cmd/cgo: avoid worklist nondeterminism.
+ Regression test.

Fixes #9026.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/162490043
2014-10-30 14:01:14 -04:00
Chris Manghane
343d113610 cmd/go: add '_go_' suffix to go files compiled by gccgo to avoid naming conflicts
Fixes #8828.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/154410043
2014-10-15 13:13:37 -07:00
Alex Brainman
d704bb0dc9 cmd/ld: do not assume that only pe section names start with '.'
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
2014-10-11 22:01:04 +11:00
Alex Brainman
9ca8368444 misc/cgo/test: add Test8517
CL 145890044 did not provide test. Rectify that.

Update #8517

LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/148790043
2014-10-09 16:10:51 +11:00
Russ Cox
685204747d runtime: fix _cgo_allocate(0)
Fixes a SWIG bug reported off-list.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/155990043
2014-10-07 16:27:40 -04:00
Russ Cox
4630218538 misc/cgo/test: fail issue 7978 with clearer error when GOTRACEBACK != 2
The test doesn't work with GOTRACEBACK != 2.
Diagnose that failure mode.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/152970043
2014-10-03 16:42:18 -04:00
Alan Donovan
74b8693c54 cmd/cgo: add missing ast.SliceExpr.Max case to AST traversal.
+ 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
2014-09-30 16:08:04 -04:00
Keith Randall
1b6807bb06 cgo: adjust return value location to account for stack copies.
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
2014-09-25 07:59:01 -07:00
Russ Cox
5917692b98 debug/dwarf: correct name for clang-generated complex type
Fixes #8694.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/143570043
2014-09-24 16:53:47 -04:00
Russ Cox
a0785a53ad cmd/go: prohibit C sources files unless using cgo
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
2014-09-24 15:10:38 -04:00
Hector Martin Cantero
7283e08cbf runtime: keep g->syscallsp consistent after cgo->Go callbacks
Normally, the caller to runtime.entersyscall() must not return before
calling runtime.exitsyscall(), lest g->syscallsp become a dangling
pointer. runtime.cgocallbackg() violates this constraint. To work around
this, save g->syscallsp and g->syscallpc around cgo->Go callbacks, then
restore them after calling runtime.entersyscall(), which restores the
syscall stack frame pointer saved by cgocall. This allows the GC to
correctly trace a goroutine that is currently returning from a
Go->cgo->Go chain.

This also adds a check to proc.c that panics if g->syscallsp is clearly
invalid. It is not 100% foolproof, as it will not catch a case where the
stack was popped then pushed back beyond g->syscallsp, but it does catch
the present cgo issue and makes existing tests fail without the bugfix.

Fixes #7978.

LGTM=dvyukov, rsc
R=golang-codereviews, dvyukov, minux, bradfitz, iant, gobot, rsc
CC=golang-codereviews, rsc
https://golang.org/cl/131910043
2014-09-24 13:20:25 -04:00
Russ Cox
fc46931442 runtime: remove untyped allocation of ParFor
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
2014-09-16 11:03:11 -04:00
Keith Randall
dbed4e9b4f runtime: get rid of other Go->C calls in test exports.
testSchedLocal* tests need to malloc now because their
stack frames are too big to fit on the G0 stack.

LGTM=iant
R=golang-codereviews, iant, khr
CC=golang-codereviews
https://golang.org/cl/133660043
2014-09-06 10:07:23 -07:00
Russ Cox
f8f630f5ec runtime: use reflect.call during panic instead of newstackcall
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
2014-09-05 16:51:45 -04:00
Russ Cox
fcbe51c9e3 misc/cgo/test: make issue5548 test pickier
If there is doubt about passing arguments correctly
(as there is in this test), there should be doubt about
getting the results back intact too. Using 0 and 1
(especially 0 for success) makes it easy to get a PASS
accidentally when the return value is not actually
being propagated. Use less common values.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/141110043
2014-09-05 14:59:09 -04:00
Russ Cox
cb767247ca runtime: refactor/fix asmcgocall/asmcgocall_errno
Instead of making asmcgocall call asmcgocall_errno,
make both load args into registers and call a shared
assembly function.

On amd64, this costs 1 word in the asmcgocall_errno path
but saves 3 words in the asmcgocall path, and the latter
is what happens on critical nosplit paths on Windows.

On arm, this fixes build failures: asmcgocall was writing
the arguments for asmcgocall_errno into the wrong
place on the stack. Passing them in registers avoids the
decision entirely.

On 386, this isn't really needed, since the nosplit paths
have twice as many words to work with, but do it for consistency.

Update #8635
Fixes arm build (except GOARM=5).

TBR=iant
CC=golang-codereviews
https://golang.org/cl/134390043
2014-09-04 00:01:55 -04:00
Russ Cox
54138e1ac3 cmd/cgo, runtime: write cgo stub wrappers in Go, not C
LGTM=alex.brainman, iant
R=golang-codereviews, alex.brainman, iant
CC=dvyukov, golang-codereviews, khr, r
https://golang.org/cl/139070043
2014-09-03 11:36:14 -04:00
Ian Lance Taylor
709096f185 misc/cgo/testcdefs: comment out test of packed structs
The [568]c compilers no longer support packed structs, so
using them with -cdefs no longer works.  Just commenting out
the test, rather than removing it, in case this needs to be
handled.  It may be that -cdefs can go away entirely in the
future, in which case so can this directory.

LGTM=mdempsky
R=rsc, mdempsky
CC=golang-codereviews
https://golang.org/cl/136030043
2014-08-31 22:59:43 -04:00
Matthew Dempsky
f2e7fa9d77 misc/cgo/test: disable issue 8428 regress test on darwin
Clang 3.2 and older (as shipped with OS X Mountain Lion and older)
outputs ambiguous DWARF debug info that makes it impossible for us to
reconstruct accurate type information as required for this test.

Fixes #8611.

LGTM=rsc
R=r, rsc, minux
CC=golang-codereviews
https://golang.org/cl/135990043
2014-08-28 22:40:57 -04:00
Matthew Dempsky
2c110a11e0 cmd/{ld,link,objdump}, runtime, debug/gosym: move linker-defined symbols into runtime package
Fixes #8092.

LGTM=rsc
R=iant, rsc
CC=golang-codereviews
https://golang.org/cl/126790043
2014-08-27 20:15:05 -04:00
Matthew Dempsky
ba30c082c0 cmd/cgo: check for compiler errors in the C preamble
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
2014-08-14 09:21:58 -07:00
Matthew Dempsky
078a9cbc6c cmd/cgo, debug/dwarf: fix translation of zero-size arrays
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
2014-08-13 11:16:30 -07:00
Matthew Dempsky
11016f62d8 cmd/cgo: make C function pointers non-assignable
Fixes #7757.
Fixes #8488.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/118690044
2014-08-12 12:55:12 -07:00
Matthew Dempsky
31a996edb6 cmd/cgo: fix default alignment for empty structs
Fixes #5242.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/125120043
2014-08-11 22:10:17 -07:00
Ian Lance Taylor
7fdb0292a5 cmd/go: pass --build-id=none when generating a cgo .o
Some systems, like Ubuntu, pass --build-id when linking.  The
effect is to put a note in the output file.  This is not
useful when generating an object file with the -r option, as
it eventually causes multiple build ID notes in the final
executable, all but one of which are for tiny portions of the
file and are therefore useless.

Disable that by passing an explicit --build-id=none when
linking with -r on systems that might do this.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/119460043
2014-08-07 12:38:39 -07:00
Matthew Dempsky
2b9f3fcead cmd/cgo: consistently map void* to *byte under -{c,go}defs
Fixes #8478.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/122150043
2014-08-06 10:28:19 -07:00
Matthew Dempsky
0da4b2dbc2 cmd/cgo: fix recursive type mapping
Instead of immediately completing pointer type mappings, add them to
a queue to allow them to be completed later.  This fixes issues	caused
by Type() returning arbitrary in-progress type mappings.

Fixes #8368.
Fixes #8441.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/122850043
2014-08-05 18:16:56 -07:00
Matthew Dempsky
f7a8adbd51 cmd/cgo: fix handling of defs_linux.go
Instead of including <sys/types.h> to get size_t, instead include
the ISO C standard <stddef.h> header, which defines fewer additional
types at risk of colliding with the user code.  In particular, this
prevents collisions between <sys/types.h>'s userspace definitions with
the kernel definitions needed by defs_linux.go.

Also, -cdefs mode uses #pragma pack, so we can keep misaligned fields.

Fixes #8477.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/120610043
2014-08-05 18:12:32 -07:00
Ian Lance Taylor
f2f17c0ff2 cmd/cgo: for -godefs, promote first field of anonymous union
Update #6677

When a struct contains an anonymous union, use the type and
name of the first field in the union.

This should make the glibc <sys/resource.h> file work; in that
file struct rusage has fields like

__extension__ union
{
        long int ru_maxrss;
        __syscall_slong_t __ru_maxrss_word;
};

in which the field that matters is ru_maxrss and
__ru_maxrss_word just exists to advance to the next field on
systems where the kernel uses long long fields but userspace
expects long fields.

LGTM=mikioh.mikioh
R=golang-codereviews, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/106260044
2014-08-05 17:10:15 -07:00
Shenghou Ma
040eeff71c undo CL 109640045 / f97fb06525e5
Breaks build for FreeBSD. Probably clang related?

««« original CL description
cmd/cgo: disable inappropriate warnings when the gcc struct is empty

package main
//#cgo CFLAGS: -Wall
//void test() {}
import "C"
func main() {
    C.test()
}

This code will cause gcc issuing warnings about unused variable.

This commit use offset of the second return value of
Packages.structType to detect whether the gcc struct is empty,
and if it's directly invoke the C function instead of writing an
unused code.

LGTM=dave, minux
R=golang-codereviews, iant, minux, dave
CC=golang-codereviews
https://golang.org/cl/109640045

»»»

TBR=dfc
R=dave
CC=golang-codereviews
https://golang.org/cl/114990044
2014-07-18 02:59:54 -04:00
snyh
086df1dc77 cmd/cgo: disable inappropriate warnings when the gcc struct is empty
package main
//#cgo CFLAGS: -Wall
//void test() {}
import "C"
func main() {
    C.test()
}

This code will cause gcc issuing warnings about unused variable.

This commit use offset of the second return value of
Packages.structType to detect whether the gcc struct is empty,
and if it's directly invoke the C function instead of writing an
unused code.

LGTM=dave, minux
R=golang-codereviews, iant, minux, dave
CC=golang-codereviews
https://golang.org/cl/109640045
2014-07-18 02:47:21 -04:00
Ian Lance Taylor
c22ed1290c cmd/cgo: for typedef of untagged struct, use typedef name in C code
Fixes #8148.

LGTM=cookieo9, rsc
R=rsc, cookieo9
CC=golang-codereviews
https://golang.org/cl/103080043
2014-06-05 10:42:03 -07:00
Ian Lance Taylor
4e65f18cae cmd/cgo: use same Go type for typedef to anonymous struct
If we see a typedef to an anonymous struct more than once,
presumably in two different Go files that import "C", use the
same Go type name.

Fixes #8133.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/102080043
2014-06-02 12:55:43 -07:00
Russ Cox
0782ee3ad5 cmd/cgo: given typedef struct S T, make C.T and C.struct_S interchangeable
For incomplete struct S, C.T and C.struct_S were interchangeable in Go 1.2
and earlier, because all incomplete types were interchangeable
(even C.struct_S1 and C.struct_S2).

CL 76450043, which fixed issue 7409, made different incomplete types
different from Go's point of view, so that they were no longer completely
interchangeable.

However, imprecision about C.T and C.struct_S - really the same
underlying C type - is the one behavior enabled by the bug that
is most likely to be depended on by existing cgo code.
Explicitly allow it, to keep that code working.

Fixes #7786.

LGTM=iant, r
R=golang-codereviews, iant, r
CC=golang-codereviews
https://golang.org/cl/98580046
2014-05-28 14:04:31 -04:00
Ian Lance Taylor
f85600859d cmd/ld: really import runtime/cgo for external link
Fixes #8032.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/95580043
2014-05-20 21:36:50 -07:00
Russ Cox
2d1a9510ed cmd/cgo: omit misaligned struct fields, like we omit bitfields
Fixes #7560.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/96300045
2014-05-12 23:48:20 -04:00
Russ Cox
e5c105033a cmd/gc: disable link-time copying of un-Go-initialized globals
If you write:

        var x = 3

then the compiler arranges for x to be initialized in the linker
with an actual 3 from the data segment, rather than putting
x in the bss and emitting init-time "x = 3" assignment code.

If you write:

        var y = x
        var x = 3

then the compiler is clever and treats this the same as if
the code said 'y = 3': they both end up in the data segment
with no init-time assignments.

If you write

        var y = x
        var x int

then the compiler was treating this the same as if the
code said 'x = 0', making both x and y zero and avoiding
any init-time assignment.

This copying optimization to avoid init-time assignment of y
is incorrect if 'var x int' doesn't mean 'x = 0' but instead means
'x is initialized in C or assembly code'. The program ends up
with 'y = 0' instead of 'y = the value specified for x in that other code'.

Disable the propagation if there is no initializer for x.

This comes up in some uses of cgo, because cgo generates
Go globals that are initialized in accompanying C files.

Fixes #7665.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/93200044
2014-05-09 16:03:44 -04:00
Ian Lance Taylor
9fc6c0598b misc/cgo/test/backdoor: add gccgo version of backdoor function
For the gc compiler the Go function Issue7695 is defined in
runtime.c, but there is no way to do that for gccgo, because
there is no way to get the correct pkgpath.  The test is not
important for gccgo in any case.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/93870044
2014-04-26 22:31:32 -07:00
Russ Cox
dc370995a8 test: demo for issue 7695
Cgo writes C function declarations pretending every arg is a pointer.
If the C function is deferred, it does not inhibit stack copying on split.
The stack copying code believes the C declaration, possibly misinterpreting
integers as pointers.

Probably the right fix for Go 1.3 is to make deferred C functions inhibit
stack copying.

For Go 1.4 and beyond we probably need to make cgo generate Go code
for 6g here, not C code for 6c.

Update #7695

LGTM=khr
R=khr
CC=golang-codereviews
https://golang.org/cl/83820043
2014-04-16 23:06:37 -04:00
Daniel Morsing
0f82cfd3f0 cmd/cgo: enforce typing of 0-sized types
cgo represents all 0-sized and unsized types internally as [0]byte. This means that pointers to incomplete types would be interchangable, even if given a name by typedef.

Fixes #7409.

LGTM=iant
R=golang-codereviews, bradfitz, iant
CC=golang-codereviews
https://golang.org/cl/76450043
2014-03-27 20:23:16 +00:00
Shenghou Ma
bcf3d55ed9 misc/cgo/testso: don't use TLS variables on Darwin and OpenBSD.
Fix build for 10.6 Darwin builders and OpenBSD builers.

LGTM=jsing
R=golang-codereviews, dave, jsing
CC=golang-codereviews
https://golang.org/cl/67710043
2014-02-23 20:37:43 -05:00
Shenghou Ma
d4a9bbef51 cmd/ld: don't emit unreachable dynimport symbols in ELF symtab.
Fix build for Dragonfly BSD.
Fixes #7318.
Fixes #7367.

LGTM=jsing, iant
R=jsing, iant, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/64340043
2014-02-23 16:20:40 -05:00
Ian Lance Taylor
1683dab725 cmd/ld: fix bug with "runtime/cgo" in external link mode
In external link mode the linker explicitly adds the string
constant "runtime/cgo".  It adds the string constant using the
same symbol name as the compiler, but a different format.  The
compiler assumes that the string data immediately follows the
string header, but the linker puts the two in different
sections.  The result is bad string data when the compiler
sees "runtime/cgo" used as a string constant.

The compiler assumption is in datastring in [568]g/gobj.c.
The linker layout is in addstrdata in ld/data.c.  The compiler
assumption is valid for string literals.  The linker is not
creating a string literal, so its assumption is also valid.

There are a few ways to avoid this problem.  This patch fixes
it by only doing the fake import of runtime/cgo if necessary,
and by only creating the string symbol if necessary.

Fixes #7234.

LGTM=dvyukov
R=golang-codereviews, dvyukov, bradfitz
CC=golang-codereviews
https://golang.org/cl/58410043
2014-01-30 09:25:47 -08:00
Russ Cox
abd556ab70 misc/cgo/testtls: make test less flaky
Now it should always fail on ARM.
(The fix is on its way too.)

R=iant, r, dave
CC=golang-codereviews
https://golang.org/cl/55140043
2014-01-21 19:44:51 -05:00
Rowan Worth
c4770b991b runtime: co-exist with NPTL's pthread_cancel.
NPTL uses SIGRTMIN (signal 32) to effect thread cancellation.
Go's runtime replaces NPTL's signal handler with its own, and
ends up aborting if a C library that ends up calling
pthread_cancel is used.

This patch prevents runtime from replacing NPTL's handler.

Fixes #6997.

R=golang-codereviews, iant, dvyukov
CC=golang-codereviews
https://golang.org/cl/47540043
2014-01-09 09:34:04 -08:00
Alex Brainman
6ede93498c misc/cgo/testcdefs: rm correct file in test.bash
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/39780043
2013-12-10 12:06:24 +11:00
Alex Brainman
6795687427 cmd/cgo: use __gcc_struct__ for go exported functions
Fixes #6833

R=minux.ma, iant
CC=golang-dev
https://golang.org/cl/35790045
2013-12-10 11:30:12 +11:00
Russ Cox
6be1cb8c7a cmd/cgo: fix handling of array of pointers when using clang
Clang does not record the "size" field for pointer types,
so we must insert the size ourselves. We were already
doing this, but only for the case of pointer types.
For an array of pointer types, the setting of the size for
the nested pointer type was happening after the computation
of the size of the array type, meaning that the array type
was always computed as 0 bytes. Delay the size computation.

This bug happens on all Clang systems, not just FreeBSD.
Our test checked that cgo wrote something, not that it was correct.
FreeBSD's default clang rejects array[0] as a C struct field,
so it noticed the incorrect sizes. But the sizes were incorrect
everywhere.

Update testcdefs to check the output has the right semantics.

Fixes #6292.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/22840043
2013-11-07 15:24:51 -05:00
Russ Cox
dbe2eacf04 cmd/cgo: fix line number in an error message
Fixes #6563.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/14870046
2013-10-18 16:52:44 -04:00
Russ Cox
06ad3b2de1 cmd/cgo: stop using compiler error message text to analyze C names
The old approach to determining whether "name" was a type, constant,
or expression was to compile the C program

        name;

and scan the errors and warnings generated by the compiler.
This requires looking for specific substrings in the errors and warnings,
which ties the implementation to specific compiler versions.
As compilers change their errors or drop warnings, cgo breaks.
This happens slowly but it does happen.
Clang in particular (now required on OS X) has a significant churn rate.

The new approach compiles a slightly more complex program
that is either valid C or not valid C depending on what kind of
thing "name" is. It uses only the presence or absence of an error
message on a particular line, not the error text itself. The program is:

        // error if and only if name is undeclared
        void f1(void) { typeof(name) *x; }

        // error if and only if name is not a type
        void f2(void) { name *x; }

        // error if and only if name is not an integer constant
        void f3(void) { enum { x = (name)*1 }; }

I had not been planning to do this until Go 1.3, because it is a
non-trivial change, but it fixes a real Xcode 5 problem in Go 1.2,
and the new code is easier to understand than the old code.
It should be significantly more robust.

Fixes #6596.
Fixes #6612.

R=golang-dev, r, james, iant
CC=golang-dev
https://golang.org/cl/15070043
2013-10-18 15:56:25 -04:00
Russ Cox
043ace1213 cmd/cgo: fix Xcode 5 incompatibility for #defined expressions
Ensure that clang always exits with a non-zero status by
giving it something that it always warns about (the statement "1;").

Fixes #6128.

R=golang-dev, iant, minux.ma
CC=golang-dev
https://golang.org/cl/14702043
2013-10-15 14:34:46 -04:00
Russ Cox
74f639176d misc/cgo/test: cut out non-standard functions
Otherwise the link fails. Fixes build.

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/14483050
2013-10-15 14:25:29 -04:00
Russ Cox
94bd34fe50 misc/cgo/test: fix build (define prototype for alloca)
TBR=golang-dev
CC=golang-dev
https://golang.org/cl/14454063
2013-10-15 13:46:57 -04:00
Russ Cox
56aeec31c6 cmd/cgo: work around bug in clang debug info for builtins like memset
Fixes #6506.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/14682044
2013-10-15 12:46:14 -04:00
Ian Lance Taylor
cd61565ffc misc/cgo/test: fix C panic test to work with gccgo
R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/14611043
2013-10-11 11:24:54 -07:00
Ian Lance Taylor
cb30917387 runtime/cgo: mark callback functions as NOSPLIT
R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/14448044
2013-10-09 08:44:47 -07:00
Russ Cox
0965459bd9 debug/dwarf: handle surprising clang encoding
Fixes a bug in cgo on OS X using clang.
See golang.org/issue/6472 for details.

Fixes #6472.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/14575043
2013-10-09 11:08:22 -04:00
Shenghou Ma
db71e1557b cmd/go: fix missing __mingw_fprintf symbol for cgo on windows
Fixes #5986.

R=golang-dev, rsc, alex.brainman
CC=golang-dev
https://golang.org/cl/13261055
2013-09-19 01:20:02 -04:00
Shenghou Ma
9add729a1f cmd/ld: handle duplicate static symbols in COFF and Mach-O files.
Fixes #5740.

R=iant, rsc, luisbebop
CC=gobot, golang-dev
https://golang.org/cl/10345046
2013-09-18 22:27:25 -04:00
Russ Cox
92dfbd3611 cmd/cgo: fix build (missing file from earlier CL)
TBR=golang-dev
CC=golang-dev
https://golang.org/cl/13700045
2013-09-16 14:21:54 -04:00
Russ Cox
647eaed93b cmd/cgo: allow C.malloc(0) always
Because we can, and because it otherwise might crash
the program if we think we're out of memory.

Fixes #6390.

R=golang-dev, iant, minux.ma
CC=golang-dev
https://golang.org/cl/13345048
2013-09-16 14:04:55 -04:00
Russ Cox
71ed6eb25a misc/cgo/test: test of issue 4339
This is not quite what that issue reports,
because this does not involve a DLL.
But I wanted to make sure this much was working.

Update #4339

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/13653043
2013-09-11 09:56:38 -04:00
Aulus Egnatius Varialus
2b44b36487 cgo: enable cgo on dragonfly
Enable cgo for dragonfly/386 and dragonfly/amd64.

R=golang-dev, jsing, iant, bradfitz
CC=golang-dev
https://golang.org/cl/13247046
2013-09-04 15:19:21 -07:00
Ian Lance Taylor
f68c23e2bb cmd/cgo: don't let #cgo directives mess up line numbering
Fixes #5272.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13498046
2013-09-03 21:15:15 -07:00
Alberto García Hierro
c18dc11ef2 cmd/cgo: Add support for C function pointers
* Add a new kind of Name, "fpvar" which stands for function pointer variable
* When walking the AST, find functions used as expressions and create a new Name object for them
* Track functions which are only used in expr contexts, and avoid generating bridge code for them

R=golang-dev, minux.ma, fullung, rsc, iant
CC=golang-dev
https://golang.org/cl/9835047
2013-08-13 12:42:21 -04:00
Keith Randall
034d5fcc30 runtime: Use old reflect.call implementation from cgo.
Basically a partial rollback of 12053043 until I can
figure out what is really going on.
Fixes bug 6051.

R=golang-dev
CC=golang-dev
https://golang.org/cl/12496043
2013-08-05 17:53:08 -07:00
Keith Randall
9cd570680b runtime: reimplement reflect.call to not use stack splitting.
R=golang-dev, r, khr, rsc
CC=golang-dev
https://golang.org/cl/12053043
2013-08-02 13:03:14 -07:00
Dmitriy Vyukov
e84d9e1fb3 runtime: do not split stacks in syscall status
Split stack checks (morestack) corrupt g->sched,
but g->sched must be preserved consistent for GC/traceback.
The change implements runtime.notetsleepg function,
which does entersyscall/exitsyscall and is carefully arranged
to not call any split functions in between.

R=rsc
CC=golang-dev
https://golang.org/cl/11575044
2013-07-29 22:22:34 +04:00
Ian Lance Taylor
d9d3debee5 cmd/cgo: gccgo fixes
Don't require a full-scale callback for calls to the special
prologue functions.

Always use a simple wrapper function for C functions, so that
we can handle static functions defined in the import "C"
comment.

Disable a test that relies on gc-specific function names.

Fixes #5905.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/11406047
2013-07-25 09:53:57 -04:00
Kevin Klues
f7dfeea90f cmd/cgo: Fix issue with cgo cdefs
The problem is that the cdecl() function in cmd/cgo/godefs.go isn't
properly translating the Go array type to a C array type when an
asterisk follows the [] in the array type declaration (it is perfectly
legal to put the asterisk on either side of the [] in go syntax,
depending on how you set up your pointers).

That said, the cdefs tool is only designed to translate from Go types
generated using the cgo *godefs* tool -- where the godefs tool is
designed to translate gcc-style C types into Go types. In essence, the
cdefs tool translates from gcc-style C types to Go types (via the godefs
tool), then back to kenc-style C types. Because of this, cdefs does not
need to know how to translate arbitraty Go types into C, just the ones
produced by godefs.

The problem is that during this translation process, the logic is
slightly wrong when going from (e.g.):

char *array[10];
to:
array [10]*int8;
back to:
int8 *array[10];

In the current implementation of cdecl(), the translation from the Go
type declaration back to the kenc-style declaration looks for Go
types of the form:

name *[]type;
rather than the actual generated Go type declaration of:
name []*type;

Both are valid Go syntax, with slightly different semantics, but the
latter is the only one that can ever be generated by the godefs tools.
(The semantics of the former are not directly expressible in a
single C statement -- you would have to have to first typedef the array
type, then declare a pointer to that typedef'd type in a separate
statement).

This commit changes the logic of cdecl() to look properly for, and
translate, Go type declarations of the form:
name []*type;

Additionally, the original implementation only allowed for a single
asterisk and a single sized aray (i.e. only a single level of pointer
indirection, and only one set of []) on the type, whereas the patched
version allows for an arbitrary number of both.

Tests are included in misc/cgo/testcdefs and the all.bash script has been
updated to account for these.

R=golang-dev, bradfitz, dave, iant
CC=golang-dev
https://golang.org/cl/11377043
2013-07-24 17:27:42 -07:00
Russ Cox
4d17efe81b misc/cgo/test: test recursive internal OS thread lock
This would have failed with CL 11663043.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/11480045
2013-07-23 14:43:55 -04:00
Dmitriy Vyukov
9fe4a9ecdd misc/cgo/test: add test for cgo callbacks with different amount of stack space available
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/11677043
2013-07-22 21:53:20 +04:00
Shenghou Ma
3d236aed9a misc/cgo/test: skip test for issue 3250, the runtime isn't ready yet.
see issue 5885.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10914045
2013-07-15 14:37:36 +08:00
Shenghou Ma
39b5f3a451 misc/cgo/test: relax the threshold in test3250.
Fixes build for some slow FreeBSD/NetBSD/Darwin builder.

R=golang-dev
CC=golang-dev
https://golang.org/cl/11207043
2013-07-12 14:13:59 +08:00
Russ Cox
41fd4f988c misc/cgo/test: make test work with -linkmode=internal
The static func named thread in issue5337.go's C snippet
conflicts with the static func named thread in issue3350.go's C snippet.
I don't know why (they're both static) but I also don't care,
because -linkmode=internal only needs to be able to handle
the cgo in the standard library, and it does.

Change the test to avoid this problem.

Fixes build (after run.bash is fixed to detect the breakage).

R=minux.ma
TBR=minux.ma
CC=golang-dev
https://golang.org/cl/11201043
2013-07-11 23:24:35 -04:00
Shenghou Ma
2f1ead7095 runtime: correctly handle signals received on foreign threads
Fixes #3250.

R=rsc
CC=golang-dev
https://golang.org/cl/10757044
2013-07-12 04:39:39 +08:00
Russ Cox
d67e7e3acf runtime: add lr, ctxt, ret to Gobuf
Add gostartcall and gostartcallfn.
The old gogocall = gostartcall + gogo.
The old gogocallfn = gostartcallfn + gogo.

R=dvyukov, minux.ma
CC=golang-dev
https://golang.org/cl/10036044
2013-06-12 15:22:26 -04:00
Dmitriy Vyukov
a8ad859c30 runtime: more flexible heap memory mapping on 64-bits
Fixes #5641.

R=golang-dev, dave, daniel.morsing, iant
CC=golang-dev, kcc
https://golang.org/cl/10126044
2013-06-12 18:47:16 +04:00
Shenghou Ma
949228a322 cmd/cgo: use gcc_struct attribute for packed structs to work around GCC PR52991.
Fixes #5603.

R=iant, dave
CC=gobot, golang-dev
https://golang.org/cl/9895043
2013-06-09 22:06:29 +08:00
Shenghou Ma
5b097e7951 cmd/cgo: using __typeof__(a->r) instead of putting invalid TYPE in "a->r = (const TYPE)"
Thanks kballard for the hint.
Fixes #4857.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9649045
2013-06-02 22:46:53 +08:00
Shenghou Ma
a307c5c9b7 misc/cgo/test: check API compatibility for cgo pseudo-functions
R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9826043
2013-05-30 02:59:57 +08:00
Dave Cheney
2ca589d494 misc/cgo/testso: use bash to run test.bash
R=golang-dev, minux.ma, capnm9
CC=golang-dev
https://golang.org/cl/9717043
2013-05-24 07:56:01 -04:00
Ian Lance Taylor
8f7863d638 cmd/cgo: use intgo, not int, for string and slice structures
Fixes #5548.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/9643044
2013-05-23 22:51:07 -07:00
Shenghou Ma
bea7b51872 cmd/go: fix LDFLAGS handling, enable misc/cgo/testso on Darwin
Fixes #5479.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/9416047
2013-05-22 00:32:03 +08:00
Shenghou Ma
af1dd56d1b misc/cgo/test: deflake TestParallelSleep once more
Fixes #5480.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9475043
2013-05-18 02:55:44 +08:00
Alex Brainman
3de593d94b misc/cgo/test: add missing import
Fixes windows build.

R=golang-dev
CC=golang-dev
https://golang.org/cl/9429043
2013-05-15 15:34:47 +10:00
Shenghou Ma
512ec7036e misc/cgo/test: test for issue 5337.
Test for CL 9226043.

R=golang-dev, dave, iant, bradfitz
CC=golang-dev
https://golang.org/cl/9249043
2013-05-15 12:33:29 +08:00
Shenghou Ma
5b78cee376 runtime: fix stack pointer corruption in runtime.cgocallback_gofunc()
runtime.setmg() calls another function (cgo_save_gm), so it must save
LR onto stack.
Re-enabled TestCthread test in misc/cgo/test.

Fixes #4863.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9019043
2013-04-30 04:13:32 +08:00
Shenghou Ma
8c72b81132 misc/cgo/testso: enable test on windows
Depends on CL 8715043 and CL 8676050.
Fixes #5273.

R=alex.brainman, r
CC=gobot, golang-dev
https://golang.org/cl/8764043
2013-04-23 04:42:04 +08:00
Shenghou Ma
a4196bb6c8 misc/cgo/test: fix a gcc warning
See https://code.google.com/p/go/issues/detail?id=5227#c16.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8833044
2013-04-18 02:33:55 +08:00
Andrew Wilkins
d06be395cc cmd/cgo, cmd/go: remove #cgo directive parsing from cmd/cgo
This change removes processing of #cgo directives from cmd/cgo,
pushing the onus back on cmd/go to pass all necessary flags.

Fixes #5224. See comments for rationale.

R=golang-dev, iant, r
CC=golang-dev
https://golang.org/cl/8610044
2013-04-10 21:41:54 -07:00
Rémy Oudompheng
0e76a943c9 cmd/ld: fix inconsistency in internal linking of common symbols.
Some variables declared in C could end up as undefined symbols
in the final binary and have null address.

Fixes #5114.
Fixes #5227.

R=golang-dev, iant, ajstarks, dave, r
CC=golang-dev
https://golang.org/cl/8602044
2013-04-10 07:15:49 +02:00
Andrey Mirtchovski
06ed730d87 misc/cgo/gmp: fix typo.
R=golang-dev, minux
CC=golang-dev
https://golang.org/cl/8174045
2013-03-30 19:02:14 +08:00
Ian Lance Taylor
30e29ee9b6 cmd/ld: emit TLS relocations during external linking
This CL was written by rsc.  I just tweaked 8l.

This CL adds TLS relocation to the ELF .o file we write during external linking,
so that the host linker (gcc) can decide the final location of m and g.

Similar relocations are not necessary on OS X because we use an alternate
program start-time mechanism to acquire thread-local storage.

Similar relocations are not necessary on ARM or Plan 9 or Windows
because external linking mode is not yet supported on those systems.

On almost all ELF systems, the references we use are like %fs:-0x4 or %gs:-0x4,
which we write in 6a/8a as -0x4(FS) or -0x4(GS). On Linux/ELF, however,
Xen's lack of support for this mode forced us long ago to use a two-instruction
sequence: first we load %gs:0x0 into a register r, and then we use -0x4(r).
(The ELF program loader arranges that %gs:0x0 contains a regular pointer to
that same memory location.) In order to relocate those -0x4(r) references,
the linker must know where they are. This CL adds the equivalent notation
-0x4(r)(GS*1) for this purpose: it assembles to the same encoding as -0x4(r)
but the (GS*1) indicates to the linker that this is one of those thread-local
references that needs relocation.

Thanks to Elias Naur for reminding me about this missing piece and
also for writing the test.

R=r
CC=golang-dev
https://golang.org/cl/7891047
2013-03-27 13:27:35 -07:00
Carl Shapiro
8480e6f476 runtime: ensure forward progress when unwinding an arm stack frame
The arm gentraceback mishandled frame linkage values pointing
to the assembly return function.  This function is special as
its frame size is zero and it contains only one instruction.
These conditions would preserve the frame pointer and result
in an off by one error when unwinding the caller.

Fixes #5124

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/8023043
2013-03-26 11:43:09 -07:00
Carl Shapiro
4cb921bbf1 runtime: store asmcgocall return PC where the ARM unwind expects it
The ARM implementation of runtime.cgocallback_gofunc diverged
from the calling convention by leaving a word of garbage at
the top of the stack and storing the return PC above the
locals.  This change stores the return PC at the top of the
stack and removes the save area above the locals.

Update #5124
This CL fixes first part of the ARM issues and added the unwind test.

R=golang-dev, bradfitz, minux.ma, cshapiro, rsc
CC=golang-dev
https://golang.org/cl/7728045
2013-03-25 14:10:28 -07:00
Russ Cox
8aafb44b0b runtime: fix cgo callbacks on windows
Fixes #4955.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/7563043
2013-03-07 09:18:48 -05:00
Alex Brainman
2f23f90dab runtime,misc/cgo/test: disable broken tests so we can test the rest
R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7486048
2013-03-06 15:19:01 -05:00
Russ Cox
77deeda717 misc/cgo/test: do not stop on first error
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7529043
2013-03-06 15:03:28 -05:00
Russ Cox
6c976393ae runtime: allow cgo callbacks on non-Go threads
Fixes #4435.

R=golang-dev, iant, alex.brainman, minux.ma, dvyukov
CC=golang-dev
https://golang.org/cl/7304104
2013-02-20 17:48:23 -05:00
Russ Cox
6d888f1e1b build: clang support
This works with at least one version of clang
that existed at one moment in time.
No guarantees about clangs past or future.

To try:
        CC=clang all.bash

It does not work with the Xcode clang,
because that clang fails at printing a useful answer
to:
        clang -print-libgcc-file-name
The clang that works prints a full path name for
that command, not just "libgcc.a".

Fixes #4713.

R=iant, minux.ma
CC=golang-dev
https://golang.org/cl/7323068
2013-02-15 13:37:43 -08:00
Russ Cox
b0a29f393b runtime: cgo-related fixes
* Separate internal and external LockOSThread, for cgo safety.
* Show goroutine that made faulting cgo call.
* Never start a panic due to a signal caused by a cgo call.

Fixes #3774.
Fixes #3775.
Fixes #3797.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7228081
2013-02-01 08:34:41 -08:00
Joel Sing
708db79011 cgo: enable cgo on openbsd
Enable cgo on OpenBSD.

The OpenBSD ld.so(1) does not currently support PT_TLS sections. Work
around this by fixing up the TCB that has been provided by librthread
and reallocating a TCB with additional space for TLS. Also provide a
wrapper for pthread_create, allowing zeroed TLS to be allocated for
threads created externally to Go.

Joint work with Shenghou Ma (minux).

Requires change 6846064.

Fixes #3205.

R=golang-dev, minux.ma, iant, rsc, iant
CC=golang-dev
https://golang.org/cl/6853059
2012-12-21 01:43:19 +11:00