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// Copyright 2014 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 runtime
#include "runtime.h"
#include "arch_GOARCH.h"
#include "malloc.h"
#include "stack.h"
#include "../../cmd/ld/textflag.h"
// This file contains functions called by Go but written
// in C. These functions are problematic for the garbage
// collector and stack copier because we don't have
// stack maps for them. So we must ensure that the
// garbage collector and stack copier cannot see these
// frames. So we impose the following invariants:
// 1) Functions should be marked NOSPLIT and call
// out to only NOSPLIT functions (recursively).
// 2) Functions should not block.
// These invariants do not hold yet but will be established once we have
// finished converting runtime support code from C to Go.
#pragma textflag NOSPLIT
func golock(p *Lock) {
runtime·lock(p);
}
#pragma textflag NOSPLIT
func gounlock(p *Lock) {
runtime·unlock(p);
}
// entry point for testing
// TODO: mcall and run on M stack
func gostringW(str Slice) (s String) {
s = runtime·gostringw((uint16*)str.array);
}
#pragma textflag NOSPLIT
func runtime·getg() (ret *G) {
ret = g;
}
#pragma textflag NOSPLIT
func runtime·acquirem() (ret *M) {
ret = g->m;
ret->locks++;
}
#pragma textflag NOSPLIT
func runtime·releasem(mp *M) {
mp->locks--;
if(mp->locks == 0 && g->preempt) {
// restore the preemption request in case we've cleared it in newstack
g->stackguard0 = StackPreempt;
}
}
#pragma textflag NOSPLIT
func runtime·gomcache() (ret *MCache) {
ret = g->m->mcache;
}
// For testing.
// TODO: find a better place for this.
func GCMask(x Eface) (mask Slice) {
runtime·getgcmask(x.data, x.type, &mask.array, &mask.len);
mask.cap = mask.len;
}
#pragma textflag NOSPLIT
func reflect·typelinks() (ret Slice) {
extern Type *runtime·typelink[], *runtime·etypelink[];
ret.array = (byte*)runtime·typelink;
ret.len = runtime·etypelink - runtime·typelink;
ret.cap = ret.len;
}
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