mirror of
https://github.com/golang/go
synced 2024-11-25 02:07:58 -07:00
runtime/cgo: take 2
This is a second attempt at submitting https://golang.org/cl/3420043 A Mercurial problem lost the new files in that submit. TBR=r CC=golang-dev https://golang.org/cl/3511043
This commit is contained in:
Russ Cox
parent
14d677ecba
commit
b07b04d35f
67
src/pkg/runtime/cgo/386.S
Executable file
67
src/pkg/runtime/cgo/386.S
Executable file
@ -0,0 +1,67 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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* Apple still insists on underscore prefixes for C function names.
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*/
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#if defined(__APPLE__) || defined(_WIN32)
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#define EXT(s) _##s
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#else
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#define EXT(s) s
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#endif
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/*
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* void crosscall_386(void (*fn)(void))
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*
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* Calling into the 8c tool chain, where all registers are caller save.
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* Called from standard x86 ABI, where %ebp, %ebx, %esi,
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* and %edi are callee-save, so they must be saved explicitly.
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*/
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.globl EXT(crosscall_386)
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EXT(crosscall_386):
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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movl 8(%ebp), %eax /* fn */
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call *%eax
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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/*
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* void crosscall2(void (*fn)(void*, int32), void*, int32)
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*
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* Save registers and call fn with two arguments.
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*/
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.globl EXT(crosscall2)
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EXT(crosscall2):
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl 16(%ebp)
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pushl 12(%ebp)
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mov 8(%ebp), %eax
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call *%eax
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addl $8,%esp
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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.globl EXT(__stack_chk_fail_local)
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EXT(__stack_chk_fail_local):
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1:
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jmp 1b
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35
src/pkg/runtime/cgo/Makefile
Normal file
35
src/pkg/runtime/cgo/Makefile
Normal file
@ -0,0 +1,35 @@
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# Copyright 2010 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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include ../../../Make.inc
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TARG=runtime/cgo
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GOFILES=\
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cgo.go\
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# Unwarranted chumminess with Make.pkg's cgo rules.
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# Do not try this at home.
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GCC_OFILES=\
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$(GOARCH).o\
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$(GOOS)_$(GOARCH).o\
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util.o\
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OFILES=\
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iscgo.$O\
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_cgo_import.$O\
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$(GCC_OFILES)\
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CGO_LDFLAGS=-lpthread
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include ../../../Make.pkg
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$(GOARCH).o: $(GOARCH).S
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$(HOST_CC) $(_CGO_CFLAGS_$(GOARCH)) -g -O2 -fPIC -o $@ -c $^
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$(GOOS)_$(GOARCH).o: $(GOOS)_$(GOARCH).c
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$(HOST_CC) $(_CGO_CFLAGS_$(GOARCH)) -g -O2 -fPIC -o $@ -c $^
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%.o: %.c
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$(HOST_CC) $(_CGO_CFLAGS_$(GOARCH)) -g -O2 -fPIC -o $@ -c $^
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73
src/pkg/runtime/cgo/amd64.S
Normal file
73
src/pkg/runtime/cgo/amd64.S
Normal file
@ -0,0 +1,73 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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* Apple still insists on underscore prefixes for C function names.
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*/
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#if defined(__APPLE__) || defined(_WIN32)
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#define EXT(s) _##s
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#else
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#define EXT(s) s
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#endif
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/*
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* void crosscall_amd64(void (*fn)(void))
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*
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* Calling into the 6c tool chain, where all registers are caller save.
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* Called from standard x86-64 ABI, where %rbx, %rbp, %r12-%r15
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* are callee-save so they must be saved explicitly.
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* The standard x86-64 ABI passes the three arguments m, g, fn
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* in %rdi, %rsi, %rdx.
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*
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* Also need to set %r15 to g and %r14 to m (see ../pkg/runtime/mkasmh.sh)
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* during the call.
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*/
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.globl EXT(crosscall_amd64)
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EXT(crosscall_amd64):
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pushq %rbx
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pushq %rbp
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pushq %r12
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pushq %r13
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pushq %r14
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pushq %r15
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call *%rdi /* fn */
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %rbp
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popq %rbx
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ret
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/*
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* void crosscall2(void (*fn)(void*, int32), void *arg, int32 argsize)
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*
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* Save registers and call fn with two arguments. fn is a Go function
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* which takes parameters on the stack rather than in registers.
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*/
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.globl EXT(crosscall2)
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EXT(crosscall2):
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subq $0x58, %rsp /* keeps stack pointer 32-byte aligned */
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movq %rbx, 0x10(%rsp)
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movq %rbp, 0x18(%rsp)
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movq %r12, 0x20(%rsp)
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movq %r13, 0x28(%rsp)
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movq %r14, 0x30(%rsp)
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movq %r15, 0x38(%rsp)
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movq %rsi, 0(%rsp) /* arg */
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movq %rdx, 8(%rsp) /* argsize (includes padding) */
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call *%rdi /* fn */
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movq 0x10(%rsp), %rbx
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movq 0x18(%rsp), %rbp
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movq 0x20(%rsp), %r12
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movq 0x28(%rsp), %r13
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movq 0x30(%rsp), %r14
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movq 0x38(%rsp), %r15
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addq $0x58, %rsp
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ret
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10
src/pkg/runtime/cgo/cgo.go
Normal file
10
src/pkg/runtime/cgo/cgo.go
Normal file
@ -0,0 +1,10 @@
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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Package cgo contains runtime support for code generated
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by the cgo tool. See the documentation for the cgo command
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for details on using cgo.
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*/
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package cgo
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144
src/pkg/runtime/cgo/darwin_386.c
Normal file
144
src/pkg/runtime/cgo/darwin_386.c
Normal file
@ -0,0 +1,144 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <pthread.h>
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#include "libcgo.h"
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static void* threadentry(void*);
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static pthread_key_t k1, k2;
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static void
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inittls(void)
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{
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uint32 x, y;
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pthread_key_t tofree[16], k;
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int i, ntofree;
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int havek1, havek2;
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/*
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* Allocate thread-local storage slots for m, g.
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* The key numbers start at 0x100, and we expect to be
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* one of the early calls to pthread_key_create, so we
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* should be able to get pretty low numbers.
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*
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* In Darwin/386 pthreads, %gs points at the thread
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* structure, and each key is an index into the thread-local
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* storage array that begins at offset 0x48 within in that structure.
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* It may happen that we are not quite the first function to try
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* to allocate thread-local storage keys, so instead of depending
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* on getting 0x100 and 0x101, we try for 0x108 and 0x109,
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* allocating keys until we get the ones we want and then freeing
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* the ones we didn't want.
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*
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* Thus the final offsets to use in %gs references are
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* 0x48+4*0x108 = 0x468 and 0x48+4*0x109 = 0x46c.
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*
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* The linker and runtime hard-code these constant offsets
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* from %gs where we expect to find m and g. The code
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* below verifies that the constants are correct once it has
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* obtained the keys. Known to ../cmd/8l/obj.c:/468
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* and to ../pkg/runtime/darwin/386/sys.s:/468
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*
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* This is truly disgusting and a bit fragile, but taking care
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* of it here protects the rest of the system from damage.
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* The alternative would be to use a global variable that
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* held the offset and refer to that variable each time we
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* need a %gs variable (m or g). That approach would
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* require an extra instruction and memory reference in
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* every stack growth prolog and would also require
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* rewriting the code that 8c generates for extern registers.
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*/
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havek1 = 0;
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havek2 = 0;
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ntofree = 0;
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while(!havek1 || !havek2) {
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if(pthread_key_create(&k, nil) < 0) {
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fprintf(stderr, "libcgo: pthread_key_create failed\n");
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abort();
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}
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if(k == 0x108) {
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havek1 = 1;
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k1 = k;
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continue;
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}
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if(k == 0x109) {
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havek2 = 1;
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k2 = k;
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continue;
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}
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||||
if(ntofree >= nelem(tofree)) {
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fprintf(stderr, "libcgo: could not obtain pthread_keys\n");
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fprintf(stderr, "\twanted 0x108 and 0x109\n");
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fprintf(stderr, "\tgot");
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for(i=0; i<ntofree; i++)
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fprintf(stderr, " %#lx", tofree[i]);
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fprintf(stderr, "\n");
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||||
abort();
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||||
}
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||||
tofree[ntofree++] = k;
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||||
}
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||||
|
||||
for(i=0; i<ntofree; i++)
|
||||
pthread_key_delete(tofree[i]);
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||||
|
||||
/*
|
||||
* We got the keys we wanted. Make sure that we observe
|
||||
* updates to k1 at 0x468, to verify that the TLS array
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||||
* offset from %gs hasn't changed.
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||||
*/
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||||
pthread_setspecific(k1, (void*)0x12345678);
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asm volatile("movl %%gs:0x468, %0" : "=r"(x));
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||||
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||||
pthread_setspecific(k1, (void*)0x87654321);
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asm volatile("movl %%gs:0x468, %0" : "=r"(y));
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||||
if(x != 0x12345678 || y != 0x87654321) {
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||||
printf("libcgo: thread-local storage %#lx not at %%gs:0x468 - x=%#x y=%#x\n", k1, x, y);
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||||
abort();
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||||
}
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||||
}
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||||
|
||||
static void
|
||||
xinitcgo(void)
|
||||
{
|
||||
inittls();
|
||||
}
|
||||
|
||||
void (*initcgo)(void) = xinitcgo;
|
||||
|
||||
void
|
||||
libcgo_sys_thread_start(ThreadStart *ts)
|
||||
{
|
||||
pthread_attr_t attr;
|
||||
pthread_t p;
|
||||
size_t size;
|
||||
|
||||
pthread_attr_init(&attr);
|
||||
pthread_attr_getstacksize(&attr, &size);
|
||||
ts->g->stackguard = size;
|
||||
pthread_create(&p, &attr, threadentry, ts);
|
||||
}
|
||||
|
||||
static void*
|
||||
threadentry(void *v)
|
||||
{
|
||||
ThreadStart ts;
|
||||
|
||||
ts = *(ThreadStart*)v;
|
||||
free(v);
|
||||
|
||||
ts.g->stackbase = (uintptr)&ts;
|
||||
|
||||
/*
|
||||
* libcgo_sys_thread_start set stackguard to stack size;
|
||||
* change to actual guard pointer.
|
||||
*/
|
||||
ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
|
||||
|
||||
pthread_setspecific(k1, (void*)ts.g);
|
||||
pthread_setspecific(k2, (void*)ts.m);
|
||||
|
||||
crosscall_386(ts.fn);
|
||||
return nil;
|
||||
}
|
||||
125
src/pkg/runtime/cgo/darwin_amd64.c
Normal file
125
src/pkg/runtime/cgo/darwin_amd64.c
Normal file
@ -0,0 +1,125 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
#include <pthread.h>
|
||||
#include "libcgo.h"
|
||||
|
||||
static void* threadentry(void*);
|
||||
static pthread_key_t k1, k2;
|
||||
|
||||
static void
|
||||
inittls(void)
|
||||
{
|
||||
uint64 x, y;
|
||||
pthread_key_t tofree[16], k;
|
||||
int i, ntofree;
|
||||
int havek1, havek2;
|
||||
|
||||
/*
|
||||
* Same logic, code as darwin_386.c:/inittls, except that words
|
||||
* are 8 bytes long now, and the thread-local storage starts at 0x60.
|
||||
* So the offsets are
|
||||
* 0x60+8*0x108 = 0x8a0 and 0x60+8*0x109 = 0x8a8.
|
||||
*
|
||||
* The linker and runtime hard-code these constant offsets
|
||||
* from %gs where we expect to find m and g. The code
|
||||
* below verifies that the constants are correct once it has
|
||||
* obtained the keys. Known to ../cmd/6l/obj.c:/8a0
|
||||
* and to ../pkg/runtime/darwin/amd64/sys.s:/8a0
|
||||
*
|
||||
* As disgusting as on the 386; same justification.
|
||||
*/
|
||||
havek1 = 0;
|
||||
havek2 = 0;
|
||||
ntofree = 0;
|
||||
while(!havek1 || !havek2) {
|
||||
if(pthread_key_create(&k, nil) < 0) {
|
||||
fprintf(stderr, "libcgo: pthread_key_create failed\n");
|
||||
abort();
|
||||
}
|
||||
if(k == 0x108) {
|
||||
havek1 = 1;
|
||||
k1 = k;
|
||||
continue;
|
||||
}
|
||||
if(k == 0x109) {
|
||||
havek2 = 1;
|
||||
k2 = k;
|
||||
continue;
|
||||
}
|
||||
if(ntofree >= nelem(tofree)) {
|
||||
fprintf(stderr, "libcgo: could not obtain pthread_keys\n");
|
||||
fprintf(stderr, "\twanted 0x108 and 0x109\n");
|
||||
fprintf(stderr, "\tgot");
|
||||
for(i=0; i<ntofree; i++)
|
||||
fprintf(stderr, " %#x", (unsigned)tofree[i]);
|
||||
fprintf(stderr, "\n");
|
||||
abort();
|
||||
}
|
||||
tofree[ntofree++] = k;
|
||||
}
|
||||
|
||||
for(i=0; i<ntofree; i++)
|
||||
pthread_key_delete(tofree[i]);
|
||||
|
||||
/*
|
||||
* We got the keys we wanted. Make sure that we observe
|
||||
* updates to k1 at 0x8a0, to verify that the TLS array
|
||||
* offset from %gs hasn't changed.
|
||||
*/
|
||||
pthread_setspecific(k1, (void*)0x123456789abcdef0ULL);
|
||||
asm volatile("movq %%gs:0x8a0, %0" : "=r"(x));
|
||||
|
||||
pthread_setspecific(k2, (void*)0x0fedcba987654321);
|
||||
asm volatile("movq %%gs:0x8a8, %0" : "=r"(y));
|
||||
|
||||
if(x != 0x123456789abcdef0ULL || y != 0x0fedcba987654321) {
|
||||
printf("libcgo: thread-local storage %#x not at %%gs:0x8a0 - x=%#llx y=%#llx\n", (unsigned)k1, x, y);
|
||||
abort();
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
xinitcgo(void)
|
||||
{
|
||||
inittls();
|
||||
}
|
||||
|
||||
void (*initcgo) = xinitcgo;
|
||||
|
||||
void
|
||||
libcgo_sys_thread_start(ThreadStart *ts)
|
||||
{
|
||||
pthread_attr_t attr;
|
||||
pthread_t p;
|
||||
size_t size;
|
||||
|
||||
pthread_attr_init(&attr);
|
||||
pthread_attr_getstacksize(&attr, &size);
|
||||
ts->g->stackguard = size;
|
||||
pthread_create(&p, &attr, threadentry, ts);
|
||||
}
|
||||
|
||||
static void*
|
||||
threadentry(void *v)
|
||||
{
|
||||
ThreadStart ts;
|
||||
|
||||
ts = *(ThreadStart*)v;
|
||||
free(v);
|
||||
|
||||
ts.g->stackbase = (uintptr)&ts;
|
||||
|
||||
/*
|
||||
* libcgo_sys_thread_start set stackguard to stack size;
|
||||
* change to actual guard pointer.
|
||||
*/
|
||||
ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
|
||||
|
||||
pthread_setspecific(k1, (void*)ts.g);
|
||||
pthread_setspecific(k2, (void*)ts.m);
|
||||
|
||||
crosscall_amd64(ts.fn);
|
||||
return nil;
|
||||
}
|
||||
14
src/pkg/runtime/cgo/iscgo.c
Normal file
14
src/pkg/runtime/cgo/iscgo.c
Normal file
@ -0,0 +1,14 @@
|
||||
// Copyright 2010 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// The runtime package contains an uninitialized definition
|
||||
// for runtime·iscgo. Override it to tell the runtime we're here.
|
||||
// There are various function pointers that should be set too,
|
||||
// but those depend on dynamic linker magic to get initialized
|
||||
// correctly, and sometimes they break. This variable is a
|
||||
// backup: it depends only on old C style static linking rules.
|
||||
|
||||
#include "../runtime.h"
|
||||
|
||||
bool runtime·iscgo = 1;
|
||||
60
src/pkg/runtime/cgo/libcgo.h
Normal file
60
src/pkg/runtime/cgo/libcgo.h
Normal file
@ -0,0 +1,60 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdio.h>
|
||||
|
||||
#define nil ((void*)0)
|
||||
#define nelem(x) (sizeof(x)/sizeof((x)[0]))
|
||||
|
||||
typedef uint32_t uint32;
|
||||
typedef uint64_t uint64;
|
||||
typedef uintptr_t uintptr;
|
||||
|
||||
/*
|
||||
* The beginning of the per-goroutine structure,
|
||||
* as defined in ../pkg/runtime/runtime.h.
|
||||
* Just enough to edit these two fields.
|
||||
*/
|
||||
typedef struct G G;
|
||||
struct G
|
||||
{
|
||||
uintptr stackguard;
|
||||
uintptr stackbase;
|
||||
};
|
||||
|
||||
/*
|
||||
* Arguments to the libcgo_thread_start call.
|
||||
* Also known to ../pkg/runtime/runtime.h.
|
||||
*/
|
||||
typedef struct ThreadStart ThreadStart;
|
||||
struct ThreadStart
|
||||
{
|
||||
uintptr m;
|
||||
G *g;
|
||||
void (*fn)(void);
|
||||
};
|
||||
|
||||
/*
|
||||
* Called by 5c/6c/8c world.
|
||||
* Makes a local copy of the ThreadStart and
|
||||
* calls libcgo_sys_thread_start(ts).
|
||||
*/
|
||||
void (*libcgo_thread_start)(ThreadStart *ts);
|
||||
|
||||
/*
|
||||
* Creates the new operating system thread (OS, arch dependent).
|
||||
*/
|
||||
void libcgo_sys_thread_start(ThreadStart *ts);
|
||||
|
||||
/*
|
||||
* Call fn in the 6c world.
|
||||
*/
|
||||
void crosscall_amd64(void (*fn)(void));
|
||||
|
||||
/*
|
||||
* Call fn in the 8c world.
|
||||
*/
|
||||
void crosscall_386(void (*fn)(void));
|
||||
68
src/pkg/runtime/cgo/linux_386.c
Normal file
68
src/pkg/runtime/cgo/linux_386.c
Normal file
@ -0,0 +1,68 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
#include <pthread.h>
|
||||
#include <string.h>
|
||||
#include "libcgo.h"
|
||||
|
||||
static void *threadentry(void*);
|
||||
|
||||
static void
|
||||
xinitcgo(void)
|
||||
{
|
||||
}
|
||||
|
||||
void (*initcgo) = xinitcgo;
|
||||
|
||||
void
|
||||
libcgo_sys_thread_start(ThreadStart *ts)
|
||||
{
|
||||
pthread_attr_t attr;
|
||||
pthread_t p;
|
||||
size_t size;
|
||||
|
||||
// Not sure why the memset is necessary here,
|
||||
// but without it, we get a bogus stack size
|
||||
// out of pthread_attr_getstacksize. C'est la Linux.
|
||||
memset(&attr, 0, sizeof attr);
|
||||
pthread_attr_init(&attr);
|
||||
size = 0;
|
||||
pthread_attr_getstacksize(&attr, &size);
|
||||
ts->g->stackguard = size;
|
||||
pthread_create(&p, &attr, threadentry, ts);
|
||||
}
|
||||
|
||||
static void*
|
||||
threadentry(void *v)
|
||||
{
|
||||
ThreadStart ts;
|
||||
|
||||
ts = *(ThreadStart*)v;
|
||||
free(v);
|
||||
|
||||
ts.g->stackbase = (uintptr)&ts;
|
||||
|
||||
/*
|
||||
* libcgo_sys_thread_start set stackguard to stack size;
|
||||
* change to actual guard pointer.
|
||||
*/
|
||||
ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
|
||||
|
||||
/*
|
||||
* Set specific keys. On Linux/ELF, the thread local storage
|
||||
* is just before %gs:0. Our dynamic 8.out's reserve 8 bytes
|
||||
* for the two words g and m at %gs:-8 and %gs:-4.
|
||||
* Xen requires us to access those words indirect from %gs:0
|
||||
* which points at itself.
|
||||
*/
|
||||
asm volatile (
|
||||
"movl %%gs:0, %%eax\n" // MOVL 0(GS), tmp
|
||||
"movl %0, -8(%%eax)\n" // MOVL g, -8(GS)
|
||||
"movl %1, -4(%%eax)\n" // MOVL m, -4(GS)
|
||||
:: "r"(ts.g), "r"(ts.m) : "%eax"
|
||||
);
|
||||
|
||||
crosscall_386(ts.fn);
|
||||
return nil;
|
||||
}
|
||||
58
src/pkg/runtime/cgo/linux_amd64.c
Normal file
58
src/pkg/runtime/cgo/linux_amd64.c
Normal file
@ -0,0 +1,58 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
#include <pthread.h>
|
||||
#include "libcgo.h"
|
||||
|
||||
static void* threadentry(void*);
|
||||
|
||||
void
|
||||
xinitcgo(void)
|
||||
{
|
||||
}
|
||||
|
||||
void (*initcgo)(void) = xinitcgo;
|
||||
|
||||
void
|
||||
libcgo_sys_thread_start(ThreadStart *ts)
|
||||
{
|
||||
pthread_attr_t attr;
|
||||
pthread_t p;
|
||||
size_t size;
|
||||
|
||||
pthread_attr_init(&attr);
|
||||
pthread_attr_getstacksize(&attr, &size);
|
||||
ts->g->stackguard = size;
|
||||
pthread_create(&p, &attr, threadentry, ts);
|
||||
}
|
||||
|
||||
static void*
|
||||
threadentry(void *v)
|
||||
{
|
||||
ThreadStart ts;
|
||||
|
||||
ts = *(ThreadStart*)v;
|
||||
free(v);
|
||||
|
||||
ts.g->stackbase = (uintptr)&ts;
|
||||
|
||||
/*
|
||||
* libcgo_sys_thread_start set stackguard to stack size;
|
||||
* change to actual guard pointer.
|
||||
*/
|
||||
ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
|
||||
|
||||
/*
|
||||
* Set specific keys. On Linux/ELF, the thread local storage
|
||||
* is just before %fs:0. Our dynamic 6.out's reserve 16 bytes
|
||||
* for the two words g and m at %fs:-16 and %fs:-8.
|
||||
*/
|
||||
asm volatile (
|
||||
"movq %0, %%fs:-16\n" // MOVL g, -16(FS)
|
||||
"movq %1, %%fs:-8\n" // MOVL m, -8(FS)
|
||||
:: "r"(ts.g), "r"(ts.m)
|
||||
);
|
||||
crosscall_amd64(ts.fn);
|
||||
return nil;
|
||||
}
|
||||
51
src/pkg/runtime/cgo/util.c
Normal file
51
src/pkg/runtime/cgo/util.c
Normal file
@ -0,0 +1,51 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
#include "libcgo.h"
|
||||
|
||||
/* Stub for calling malloc from Go */
|
||||
static void
|
||||
x_cgo_malloc(void *p)
|
||||
{
|
||||
struct a {
|
||||
long long n;
|
||||
void *ret;
|
||||
} *a = p;
|
||||
|
||||
a->ret = malloc(a->n);
|
||||
}
|
||||
|
||||
void (*_cgo_malloc)(void*) = x_cgo_malloc;
|
||||
|
||||
/* Stub for calling from Go */
|
||||
static void
|
||||
x_cgo_free(void *p)
|
||||
{
|
||||
struct a {
|
||||
void *arg;
|
||||
} *a = p;
|
||||
|
||||
free(a->arg);
|
||||
}
|
||||
|
||||
void (*_cgo_free)(void*) = x_cgo_free;
|
||||
|
||||
/* Stub for creating a new thread */
|
||||
static void
|
||||
xlibcgo_thread_start(ThreadStart *arg)
|
||||
{
|
||||
ThreadStart *ts;
|
||||
|
||||
/* Make our own copy that can persist after we return. */
|
||||
ts = malloc(sizeof *ts);
|
||||
if(ts == nil) {
|
||||
fprintf(stderr, "libcgo: out of memory in thread_start\n");
|
||||
abort();
|
||||
}
|
||||
*ts = *arg;
|
||||
|
||||
libcgo_sys_thread_start(ts); /* OS-dependent half */
|
||||
}
|
||||
|
||||
void (*libcgo_thread_start)(ThreadStart*) = xlibcgo_thread_start;
|
||||
Loading…
Reference in New Issue
Block a user