mirror of
https://github.com/golang/go.git
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cgo: works on amd64.
integrated into Makefiles (see misc/cgo/gmp/Makefile). R=r DELTA=1110 (540 added, 525 deleted, 45 changed) OCL=35153 CL=35158
This commit is contained in:
Russ Cox
parent
16ce29802a
commit
cce01111a9
23
misc/cgo/gmp/Makefile
Normal file
23
misc/cgo/gmp/Makefile
Normal file
@ -0,0 +1,23 @@
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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 $(GOROOT)/src/Make.$(GOARCH)
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TARG=gmp
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CGOFILES=\
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gmp.go
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CGO_LDFLAGS=-lgmp
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# Can have plain GOFILES too, but this example doesn't.
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include $(GOROOT)/src/Make.pkg
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# Simple test program
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pidigits.$O: install pidigits.go
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$(GC) pidigits.go
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pidigits: pidigits.$O
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$(LD) -o $@ pidigits.$O
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@ -32,8 +32,8 @@ arithmetic types. A C struct translates to a Go struct, field by
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field; unrepresentable fields are replaced with opaque byte arrays. A
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C union translates into a struct containing the first union member and
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perhaps additional padding. C arrays become Go arrays. C pointers
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become Go pointers. C function pointers and void pointers become Go's
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*byte.
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become Go pointers. C function pointers become Go's uintptr.
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C void pointer's become Go's unsafe.Pointer.
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For example, mpz_t is defined in <gmp.h> as:
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@ -81,17 +81,8 @@ calls the C xxx in a standard pthread. The new function translates
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its arguments, calls xxx, and translates the return value.
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Translation of parameters and the return value follows the type
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translation above with one extension: a function expecting a char*
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will change to expect a string, and a function returning a char* will
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change to return a string. The wrapper that cgo generates for the
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first case allocates a new C string, passes that pointer to the C
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function, and then frees the string when the function returns. The
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wrapper for the second case assumes the char* being returned is
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pointer that must be freed. It makes a Go string with a copy of the
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contents and then frees the pointer. The char* conventions are a
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useful heuristic; there should be some way to override them but isn't
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yet. One can also imagine wrapping Go functions being passed into C
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functions so that C can call them.
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translation above except that arrays passed as parameters translate
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explicitly in Go to pointers to arrays, as they do (implicitly) in C.
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Garbage collection is the big problem. It is fine for the Go world to
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have pointers into the C world and to free those pointers when they
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@ -101,86 +92,11 @@ wrapped by Go objects with appropriate destroy methods.
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It is much more difficult for the C world to have pointers into the Go
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world, because the Go garbage collector is unaware of the memory
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allocated by C. I think the most important consideration is not to
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constrain future implementations, so the rule is basically that Go
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code can hand a Go pointer to C code but must separately arrange for
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allocated by C. The most important consideration is not to
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constrain future implementations, so the rule is that Go code can
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hand a Go pointer to C code but must separately arrange for
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Go to hang on to a reference to the pointer until C is done with it.
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Note: the sketches assume that the char* <-> string conversions described
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above have been thrown away. Otherwise one can't pass nil as the first
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argument to mpz_get_str.
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Sketch of 6c.c:
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// NOTE: Maybe cgo is smart enough to figure out that
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// mpz_init's real C name is __gmpz_init and use that instead.
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// Tell dynamic linker to initialize _cgo_mpz_init in this file
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// to point at the function of the same name in gcc.c.
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#pragma dynld _cgo_mpz_init _cgo_mpz_init "gmp.so"
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#pragma dynld _cgo_mpz_get_str _cgo_mpz_get_str "gmp.so"
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void (*_cgo_mpz_init)(void*);
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void (*_cgo_mpz_get_str)(void*);
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// implementation of Go function called as C.mpz_init below.
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void
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gmp·_C_mpz_init(struct { char x[8]; } p) // dummy struct, same size as 6g parameter frame
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{
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cgocall(_cgo_mpz_init, &p);
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}
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void
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gmp·_C_mpz_get_str(struct { char x[32]; } p)
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{
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cgocall(_cgo_mpz_get_str, &p);
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}
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Sketch of 6g.go:
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// Type declarations from above, omitted.
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// Extern declarations for 6c.c functions
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func _C_mpz_init(*_C_mpz_t)
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func _C_mpz_get_str(*_C_char, int32, *_C_mpz_t) *_C_char
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// Original Go source with C.xxx replaced by _C_xxx
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// as described above.
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Sketch of gcc.c:
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void
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_cgo_mpz_init(void *v)
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{
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struct {
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__mpz_struct *p1; // not mpz_t because of C array passing rule
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} *a = v;
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mpz_init(a->p1);
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}
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void
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_cgo_mpz_get_str(void *v)
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{
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struct {
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char *p1;
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int32 p2;
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in32 _pad1;
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__mpz_struct *p3;
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char *p4;
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} *a = v;
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a->p4 = mpz_get_str(a->p1, a->p2, a->p3);
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}
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Gmp defines mpz_t as __mpz_struct[1], meaning that if you
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declare one it takes up a struct worth of space, but when you
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pass one to a function, it passes a pointer to the space instead
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of copying it. This can't be modeled directly in Go or in C structs
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so some rewriting happens in the generated files. In Go,
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the functions take *_C_mpz_t instead of _C_mpz_t, and in the
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GCC structs, the parameters are __mpz_struct* instead of mpz_t.
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*/
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package gmp
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// #include <gmp.h>
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104
misc/cgo/gmp/pidigits.go
Normal file
104
misc/cgo/gmp/pidigits.go
Normal file
@ -0,0 +1,104 @@
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of "The Computer Language Benchmarks Game" nor the
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name of "The Computer Language Shootout Benchmarks" nor the names of
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its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* The Computer Language Benchmarks Game
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* http://shootout.alioth.debian.org/
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*
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* contributed by The Go Authors.
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* based on pidigits.c (by Paolo Bonzini & Sean Bartlett,
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* modified by Michael Mellor)
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*/
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package main
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import (
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big "gmp";
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"fmt";
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"runtime";
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)
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var (
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tmp1 = big.NewInt(0);
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tmp2 = big.NewInt(0);
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numer = big.NewInt(1);
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accum = big.NewInt(0);
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denom = big.NewInt(1);
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ten = big.NewInt(10);
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)
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func extractDigit() int64 {
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if big.CmpInt(numer, accum) > 0 {
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return -1;
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}
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tmp1.Lsh(numer, 1).Add(tmp1, numer).Add(tmp1, accum);
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big.DivModInt(tmp1, tmp2, tmp1, denom);
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tmp2.Add(tmp2, numer);
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if big.CmpInt(tmp2, denom) >= 0 {
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return -1;
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}
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return tmp1.Int64();
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}
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func nextTerm(k int64) {
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y2 := k*2 + 1;
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accum.Add(accum, tmp1.Lsh(numer, 1));
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accum.Mul(accum, tmp1.SetInt64(y2));
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numer.Mul(numer, tmp1.SetInt64(k));
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denom.Mul(denom, tmp1.SetInt64(y2));
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}
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func eliminateDigit(d int64) {
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accum.Sub(accum, tmp1.Mul(denom, tmp1.SetInt64(d)));
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accum.Mul(accum, ten);
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numer.Mul(numer, ten);
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}
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func main() {
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i := 0;
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k := int64(0);
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for {
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d := int64(-1);
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for d < 0 {
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k++;
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nextTerm(k);
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d = extractDigit();
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}
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eliminateDigit(d);
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fmt.Printf("%c", d + '0');
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if i++; i%50 == 0 {
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fmt.Printf("\n");
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if i >= 1000 {
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break;
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}
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}
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}
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fmt.Printf("\n%d calls; bit sizes: %d %d %d\n", runtime.Cgocalls(), numer.Len(), accum.Len(), denom.Len());
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}
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83
src/Make.pkg
83
src/Make.pkg
@ -8,15 +8,23 @@ testpackage: _test/$(TARG).a
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elem=$(lastword $(subst /, ,$(TARG)))
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dir=$(patsubst %/$(elem),%,./$(TARG))
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pkgdir=$(GOROOT)/pkg/$(GOOS)_$(GOARCH)
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INSTALLFILES=$(pkgdir)/$(TARG).a
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# The rest of the cgo rules are below, but these variable updates
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# must be done here so they apply to the main rules.
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GOFILES+=$(patsubst %.go,%.cgo1.go,$(CGOFILES))
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GOFILES+=$(patsubst %.go,%.cgo2.go,$(CGOFILES))
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OFILES+=$(patsubst %.go,%.cgo3.$O,$(CGOFILES))
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INSTALLFILES+=$(patsubst %.go,$(pkgdir)/$(dir)/$(elem)_%.so,$(CGOFILES))
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coverage:
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gotest
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6cov -g $(shell pwd) | grep -v '_test\.go:'
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clean:
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rm -rf *.[$(OS)] *.a [$(OS)].out _obj _test _testmain.go
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rm -rf *.[$(OS)o] *.a [$(OS)].out *.cgo[12].go *.cgo[34].c *.so _obj _test _testmain.go
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test:
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gotest
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@ -27,11 +35,11 @@ nuke: clean
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testpackage-clean:
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rm -f _test/$(TARG).a _gotest_.$O
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install: $(pkgdir)/$(TARG).a
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install: $(INSTALLFILES)
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$(pkgdir)/$(TARG).a: package
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test -d $(GOROOT)/pkg && mkdir -p $(pkgdir)/$(dir)
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cp _obj/$(TARG).a $(pkgdir)/$(TARG).a
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@test -d $(GOROOT)/pkg && mkdir -p $(pkgdir)/$(dir)
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cp _obj/$(TARG).a $@
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_go_.$O: $(GOFILES)
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$(GC) -o $@ $(GOFILES)
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@ -39,21 +47,13 @@ _go_.$O: $(GOFILES)
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_gotest_.$O: $(GOFILES) $(GOTESTFILES)
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$(GC) -o $@ $(GOFILES) $(GOTESTFILES)
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%.$O: %.c
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$(CC) $(CFLAGS) $*.c
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%.$O: %.s
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$(AS) $*.s
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%.$O: $(HFILES)
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_obj/$(TARG).a: _go_.$O $(OFILES)
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mkdir -p _obj/$(dir)
|
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@mkdir -p _obj/$(dir)
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rm -f _obj/$(TARG).a
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gopack grc $@ _go_.$O $(OFILES)
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_test/$(TARG).a: _gotest_.$O $(OFILES)
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mkdir -p _test/$(dir)
|
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@mkdir -p _test/$(dir)
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rm -f _test/$(TARG).a
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gopack grc $@ _gotest_.$O $(OFILES)
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|
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@ -63,3 +63,56 @@ importpath:
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dir:
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@echo $(dir)
|
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|
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|
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# To use cgo in a Go package, add a line
|
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#
|
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# CGOFILES=x.go
|
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#
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# to the main Makefile. This signals that cgo should process x.go.
|
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# There are two optional variables to set, CGO_CFLAGS and CGO_LDFLAGS,
|
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# which specify compiler and linker flags to use when compiling
|
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# (using gcc) the C support for x.go.
|
||||
|
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# Cgo translates each x.go file listed in $(CGOFILES) into
|
||||
#
|
||||
# x.cgo1.go - basic translation of x.go
|
||||
# x.cgo2.go - declarations needed for x.cgo1.go; imports "unsafe"
|
||||
# x.cgo3.c - C trampoline code to be compiled with 6c and linked into the package
|
||||
# x.cgo4.c - C implementations compiled with gcc to create dynamic library
|
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#
|
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%.cgo1.go %.cgo2.go %.cgo3.c %.cgo4.c: %.go
|
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cgo $*.go
|
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|
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# The rules above added x.cgo1.go and x.cgo2.go to $(GOFILES),
|
||||
# added x.cgo3.$O to $OFILES, and added the installed copy of
|
||||
# package_x.so (built from x.cgo4.c) to $(INSTALLFILES).
|
||||
|
||||
# Compile x.cgo3.c with 6c; needs access to the runtime headers.
|
||||
RUNTIME_CFLAGS_amd64=-D_64BIT
|
||||
RUNTIME_CFLAGS=-I$(GOROOT)/src/pkg/runtime $(RUNTIME_CFLAGS_$(GOARCH))
|
||||
%.cgo3.$O: %.cgo3.c
|
||||
$(CC) $(CFLAGS) $(RUNTIME_CFLAGS) $*.cgo3.c
|
||||
|
||||
# Compile x.cgo4.c with gcc to make package_x.so.
|
||||
%.cgo4.o: %.cgo4.c
|
||||
gcc -fPIC -O2 -o $@ -c $(CGO_CFLAGS) $*.cgo4.c
|
||||
|
||||
$(elem)_%.so: %.cgo4.o
|
||||
gcc -shared -o $@ $*.cgo4.o $(CGO_LDFLAGS)
|
||||
|
||||
$(pkgdir)/$(dir)/$(elem)_%.so: $(elem)_%.so
|
||||
@test -d $(GOROOT)/pkg && mkdir -p $(pkgdir)/$(dir)
|
||||
cp $(elem)_$*.so $@
|
||||
|
||||
|
||||
# Generic build rules.
|
||||
# These come last so that the rules above can override them
|
||||
# for more specific file names.
|
||||
%.$O: %.c
|
||||
$(CC) $(CFLAGS) $*.c
|
||||
|
||||
%.$O: %.s
|
||||
$(AS) $*.s
|
||||
|
||||
%.$O: $(HFILES)
|
||||
|
||||
|
||||
@ -13,28 +13,3 @@ GOFILES=\
|
||||
util.go\
|
||||
|
||||
include $(GOROOT)/src/Make.cmd
|
||||
|
||||
# Tests
|
||||
# TODO(rsc): Delete
|
||||
|
||||
gmp:
|
||||
make cgo
|
||||
cgo gmp.go
|
||||
gcc -fPIC -O2 -o gcc.o -c _cgo_gcc.c
|
||||
gcc -shared -o gmp.so gcc.o -L$(GOROOT)/pkg/$(GOOS)_$(GOARCH) -lcgo -lgmp
|
||||
6c -D_64BIT -I$(GOROOT)/src/pkg/runtime _cgo_c.c
|
||||
6g _cgo_go.go
|
||||
gopack grc gmp.a _cgo_c.6 _cgo_go.6
|
||||
6g pidigits.go
|
||||
6l pidigits.6
|
||||
LD_LIBRARY_PATH=.:$(GOROOT)/pkg/$(GOOS)_$(GOARCH) 6.out
|
||||
|
||||
stdio:
|
||||
make cgo
|
||||
cgo stdio.go
|
||||
gcc -fPIC -O2 -o gcc.o -c _cgo_gcc.c
|
||||
gcc -shared -Wl,--rpath -Wl,$(GOROOT)/pkg/$(GOOS)_$(GOARCH) -o main.so gcc.o -L$(GOROOT)/pkg/$(GOOS)_$(GOARCH) -lcgo
|
||||
6c -D_64BIT -I$(GOROOT)/src/pkg/runtime _cgo_c.c
|
||||
6g _cgo_go.go
|
||||
6l _cgo_c.6 _cgo_go.6
|
||||
LD_LIBRARY_PATH=.:$(GOROOT)/pkg/$(GOOS)_$(GOARCH) 6.out
|
||||
|
||||
@ -13,7 +13,6 @@ import (
|
||||
"go/parser";
|
||||
"go/scanner";
|
||||
"os";
|
||||
"strings";
|
||||
)
|
||||
|
||||
// A Cref refers to an expression of the form C.xxx in the AST.
|
||||
@ -73,11 +72,8 @@ func openProg(name string) *Prog {
|
||||
p.Package = p.AST.Name.Value;
|
||||
|
||||
// Find the import "C" line and get any extra C preamble.
|
||||
// Delete the import "C" line along the way or convert it
|
||||
// to an import of "unsafe" (needed for the translation of void*).
|
||||
// Delete the import "C" line along the way.
|
||||
sawC := false;
|
||||
sawUnsafe := false;
|
||||
rewroteUnsafe := false;
|
||||
w := 0;
|
||||
for _, decl := range p.AST.Decls {
|
||||
d, ok := decl.(*ast.GenDecl);
|
||||
@ -90,14 +86,6 @@ func openProg(name string) *Prog {
|
||||
for _, spec := range d.Specs {
|
||||
s, ok := spec.(*ast.ImportSpec);
|
||||
if !ok || len(s.Path) != 1 || string(s.Path[0].Value) != `"C"` {
|
||||
if s != nil && len(s.Path) == 1 && string(s.Path[0].Value) == `"unsafe"` {
|
||||
if rewroteUnsafe {
|
||||
// we rewrote the import "C" into import "unsafe",
|
||||
// so drop this one.
|
||||
continue;
|
||||
}
|
||||
sawUnsafe = true;
|
||||
}
|
||||
d.Specs[ws] = spec;
|
||||
ws++;
|
||||
continue;
|
||||
@ -111,12 +99,6 @@ func openProg(name string) *Prog {
|
||||
} else if len(d.Specs) == 1 && d.Doc != nil {
|
||||
p.Preamble += doc.CommentText(d.Doc) + "\n";
|
||||
}
|
||||
if !sawUnsafe {
|
||||
rewroteUnsafe = true;
|
||||
s.Path[0].Value = strings.Bytes(`"unsafe"`);
|
||||
d.Specs[ws] = spec;
|
||||
ws++;
|
||||
}
|
||||
}
|
||||
if ws == 0 {
|
||||
continue;
|
||||
|
||||
@ -69,5 +69,5 @@ func main() {
|
||||
}
|
||||
|
||||
p.PackagePath = p.Package;
|
||||
p.writeOutput(args[0], "_cgo_go.go", "_cgo_c.c", "_cgo_gcc.c");
|
||||
p.writeOutput(args[0]);
|
||||
}
|
||||
|
||||
@ -9,49 +9,62 @@ import (
|
||||
"go/ast";
|
||||
"go/printer";
|
||||
"os";
|
||||
"strings";
|
||||
)
|
||||
|
||||
func creat(name string) *os.File {
|
||||
f, err := os.Open(name, os.O_WRONLY|os.O_CREAT|os.O_TRUNC, 0666);
|
||||
if err != nil {
|
||||
fatal("%s", err);
|
||||
}
|
||||
return f;
|
||||
}
|
||||
|
||||
// writeOutput creates output files to be compiled by 6g, 6c, and gcc.
|
||||
// (The comments here say 6g and 6c but the code applies to the 8 and 5 tools too.)
|
||||
func (p *Prog) writeOutput(srcfile, go_, c, gcc string) {
|
||||
fgo, err := os.Open(go_, os.O_WRONLY|os.O_CREAT|os.O_TRUNC, 0666);
|
||||
if err != nil {
|
||||
fatal("%s", err);
|
||||
}
|
||||
fc, err := os.Open(c, os.O_WRONLY|os.O_CREAT|os.O_TRUNC, 0666);
|
||||
if err != nil {
|
||||
fatal("%s", err);
|
||||
}
|
||||
fgcc, err := os.Open(gcc, os.O_WRONLY|os.O_CREAT|os.O_TRUNC, 0666);
|
||||
if err != nil {
|
||||
fatal("%s", err);
|
||||
}
|
||||
func (p *Prog) writeOutput(srcfile string) {
|
||||
pkgroot := os.Getenv("GOROOT") + "/pkg/" + os.Getenv("GOOS") + "_" + os.Getenv("GOARCH");
|
||||
|
||||
// Write Go output: Go input with rewrites of C.xxx to _C_xxx,
|
||||
// then append the definitions of the _C_xxx types and vars and funcs.
|
||||
fmt.Fprintf(fgo, "//line %s:1\n", srcfile);
|
||||
printer.Fprint(fgo, p.AST, 0, 8);
|
||||
fmt.Fprintf(fgo, "\n\n// Added by cgo\n");
|
||||
base := srcfile;
|
||||
if strings.HasSuffix(base, ".go") {
|
||||
base = base[0:len(base)-3];
|
||||
}
|
||||
fgo1 := creat(base + ".cgo1.go");
|
||||
fgo2 := creat(base + ".cgo2.go");
|
||||
fc := creat(base + ".cgo3.c");
|
||||
fgcc := creat(base + ".cgo4.c");
|
||||
|
||||
// Write Go output: Go input with rewrites of C.xxx to _C_xxx.
|
||||
fmt.Fprintf(fgo1, "// Created by cgo - DO NOT EDIT\n");
|
||||
fmt.Fprintf(fgo1, "//line %s:1\n", srcfile);
|
||||
printer.Fprint(fgo1, p.AST, 0, 8);
|
||||
|
||||
// Write second Go output: definitions of _C_xxx.
|
||||
// In a separate file so that the import of "unsafe" does not
|
||||
// pollute the original file.
|
||||
fmt.Fprintf(fgo2, "// Created by cgo - DO NOT EDIT\n");
|
||||
fmt.Fprintf(fgo2, "package %s\n\n", p.Package);
|
||||
fmt.Fprintf(fgo2, "import \"unsafe\"\n\n");
|
||||
|
||||
for name, def := range p.Typedef {
|
||||
fmt.Fprintf(fgo, "type %s ", name);
|
||||
printer.Fprint(fgo, def, 0, 8);
|
||||
fmt.Fprintf(fgo, "\n");
|
||||
fmt.Fprintf(fgo2, "type %s ", name);
|
||||
printer.Fprint(fgo2, def, 0, 8);
|
||||
fmt.Fprintf(fgo2, "\n");
|
||||
}
|
||||
fmt.Fprintf(fgo, "type _C_void [0]byte\n");
|
||||
fmt.Fprintf(fgo2, "type _C_void [0]byte\n");
|
||||
|
||||
// While we process the vars and funcs, also write 6c and gcc output.
|
||||
// Gcc output starts with the preamble.
|
||||
fmt.Fprintf(fgcc, "%s\n", p.Preamble);
|
||||
fmt.Fprintf(fgcc, "%s\n", gccProlog);
|
||||
|
||||
fmt.Fprintf(fc, cProlog, p.Package, p.Package);
|
||||
fmt.Fprintf(fc, cProlog, pkgroot, pkgroot, pkgroot, pkgroot, p.Package, p.Package);
|
||||
|
||||
for name, def := range p.Vardef {
|
||||
fmt.Fprintf(fc, "#pragma dynld %s·_C_%s %s \"%s.so\"\n", p.Package, name, name, p.PackagePath);
|
||||
fmt.Fprintf(fgo, "var _C_%s ", name);
|
||||
printer.Fprint(fgo, &ast.StarExpr{X: def.Go}, 0, 8);
|
||||
fmt.Fprintf(fgo, "\n");
|
||||
fmt.Fprintf(fc, "#pragma dynld %s·_C_%s %s \"%s/%s_%s.so\"\n", p.Package, name, name, pkgroot, p.PackagePath, base);
|
||||
fmt.Fprintf(fgo2, "var _C_%s ", name);
|
||||
printer.Fprint(fgo2, &ast.StarExpr{X: def.Go}, 0, 8);
|
||||
fmt.Fprintf(fgo2, "\n");
|
||||
}
|
||||
fmt.Fprintf(fc, "\n");
|
||||
|
||||
@ -61,8 +74,8 @@ func (p *Prog) writeOutput(srcfile, go_, c, gcc string) {
|
||||
Name: &ast.Ident{Value: "_C_" + name},
|
||||
Type: def.Go,
|
||||
};
|
||||
printer.Fprint(fgo, d, 0, 8);
|
||||
fmt.Fprintf(fgo, "\n");
|
||||
printer.Fprint(fgo2, d, 0, 8);
|
||||
fmt.Fprintf(fgo2, "\n");
|
||||
|
||||
if name == "CString" || name == "GoString" {
|
||||
// The builtins are already defined in the C prolog.
|
||||
@ -118,7 +131,7 @@ func (p *Prog) writeOutput(srcfile, go_, c, gcc string) {
|
||||
|
||||
// C wrapper calls into gcc, passing a pointer to the argument frame.
|
||||
// Also emit #pragma to get a pointer to the gcc wrapper.
|
||||
fmt.Fprintf(fc, "#pragma dynld _cgo_%s _cgo_%s \"%s.so\"\n", name, name, p.PackagePath);
|
||||
fmt.Fprintf(fc, "#pragma dynld _cgo_%s _cgo_%s \"%s/%s_%s.so\"\n", name, name, pkgroot, p.PackagePath, base);
|
||||
fmt.Fprintf(fc, "void (*_cgo_%s)(void*);\n", name);
|
||||
fmt.Fprintf(fc, "\n");
|
||||
fmt.Fprintf(fc, "void\n");
|
||||
@ -149,6 +162,11 @@ func (p *Prog) writeOutput(srcfile, go_, c, gcc string) {
|
||||
fmt.Fprintf(fgcc, "}\n");
|
||||
fmt.Fprintf(fgcc, "\n");
|
||||
}
|
||||
|
||||
fgo1.Close();
|
||||
fgo2.Close();
|
||||
fc.Close();
|
||||
fgcc.Close();
|
||||
}
|
||||
|
||||
const gccProlog = `
|
||||
@ -179,10 +197,10 @@ const cProlog = `
|
||||
#include "runtime.h"
|
||||
#include "cgocall.h"
|
||||
|
||||
#pragma dynld initcgo initcgo "libcgo.so"
|
||||
#pragma dynld cgo cgo "libcgo.so"
|
||||
#pragma dynld _cgo_malloc _cgo_malloc "libcgo.so"
|
||||
#pragma dynld _cgo_free free "libcgo.so"
|
||||
#pragma dynld initcgo initcgo "%s/libcgo.so"
|
||||
#pragma dynld cgo cgo "%s/libcgo.so"
|
||||
#pragma dynld _cgo_malloc _cgo_malloc "%s/libcgo.so"
|
||||
#pragma dynld _cgo_free free "%s/libcgo.so"
|
||||
|
||||
void
|
||||
%s·_C_GoString(int8 *p, String s)
|
||||
|
||||
@ -1,27 +0,0 @@
|
||||
// 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.
|
||||
|
||||
package main
|
||||
|
||||
// #include <stdio.h>
|
||||
// #include <stdlib.h>
|
||||
import "C"
|
||||
|
||||
type File C.FILE;
|
||||
|
||||
func (f *File) Putc(c int) {
|
||||
C.putc(C.int(c), (*C.FILE)(f));
|
||||
}
|
||||
|
||||
func (f *File) Puts(s string) {
|
||||
p := C.CString(s);
|
||||
C.fputs(p, (*C.FILE)(f));
|
||||
C.free(unsafe.Pointer(p));
|
||||
}
|
||||
|
||||
var Stdout = (*File)(C.stdout);
|
||||
|
||||
func main() {
|
||||
Stdout.Puts("hello, world\n");
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user