mirror of
https://github.com/golang/go
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7f8a5057dd
Fixes #6338 R=golang-dev, kin.wilson.za, rsc CC=golang-dev https://golang.org/cl/36180044
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
// 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 "runtime.h"
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#include "type.h"
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#include "typekind.h"
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#include "defs_GOOS_GOARCH.h"
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#include "os_GOOS.h"
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#include "zasm_GOOS_GOARCH.h"
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typedef struct Callbacks Callbacks;
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struct Callbacks {
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Lock;
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WinCallbackContext* ctxt[cb_max];
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int32 n;
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};
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static Callbacks cbs;
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WinCallbackContext** runtime·cbctxts; // to simplify access to cbs.ctxt in sys_windows_*.s
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// Call back from windows dll into go.
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byte *
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runtime·compilecallback(Eface fn, bool cleanstack)
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{
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FuncType *ft;
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Type *t;
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int32 argsize, i, n;
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WinCallbackContext *c;
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if(fn.type == nil || fn.type->kind != KindFunc)
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runtime·panicstring("compilecallback: not a function");
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ft = (FuncType*)fn.type;
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if(ft->out.len != 1)
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runtime·panicstring("compilecallback: function must have one output parameter");
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if(((Type**)ft->out.array)[0]->size != sizeof(uintptr))
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runtime·panicstring("compilecallback: output parameter size is wrong");
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argsize = 0;
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for(i=0; i<ft->in.len; i++) {
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t = ((Type**)ft->in.array)[i];
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if(t->size > sizeof(uintptr))
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runtime·panicstring("compilecallback: input parameter size is wrong");
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argsize += sizeof(uintptr);
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}
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runtime·lock(&cbs);
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if(runtime·cbctxts == nil)
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runtime·cbctxts = &(cbs.ctxt[0]);
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n = cbs.n;
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for(i=0; i<n; i++) {
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if(cbs.ctxt[i]->gobody == fn.data && cbs.ctxt[i]->cleanstack == cleanstack) {
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runtime·unlock(&cbs);
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// runtime·callbackasm is just a series of CALL instructions
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// (each is 5 bytes long), and we want callback to arrive at
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// correspondent call instruction instead of start of
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// runtime·callbackasm.
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return (byte*)runtime·callbackasm + i * 5;
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}
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}
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if(n >= cb_max)
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runtime·throw("too many callback functions");
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c = runtime·mal(sizeof *c);
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c->gobody = fn.data;
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c->argsize = argsize;
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c->cleanstack = cleanstack;
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if(cleanstack && argsize!=0)
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c->restorestack = argsize;
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else
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c->restorestack = 0;
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cbs.ctxt[n] = c;
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cbs.n++;
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runtime·unlock(&cbs);
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// as before
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return (byte*)runtime·callbackasm + n * 5;
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}
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