go/src/cmd/gc/obj.c

// 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 "go.h"

/*
 * architecture-independent object file output
 */

void
dumpobj(void)
{
	bout = Bopen(outfile, OWRITE);
	if(bout == nil)
		fatal("cant open %s", outfile);

	Bprint(bout, "%s\n", thestring);
	Bprint(bout, "  exports automatically generated from\n");
	Bprint(bout, "  %s in package \"%s\"\n", curio.infile, package);
	dumpexport();
	Bprint(bout, "\n!\n");

	outhist(bout);

	// add nil plist w AEND to catch
	// auto-generated trampolines, data
	newplist();

	dumpglobls();
	dumptypestructs();
	dumpdata();
	dumpfuncs();

	Bterm(bout);
}

void
dumpglobls(void)
{
	Dcl *d;
	Sym *s;
	Node *n;

	// add globals
	for(d=externdcl; d!=D; d=d->forw) {
		if(d->op != ONAME)
			continue;

		s = d->dsym;
		if(s == S)
			fatal("external nil");
		n = d->dnode;
		if(n == N || n->type == T)
			fatal("external %S nil\n", s);

		if(n->class == PFUNC)
			continue;

		dowidth(n->type);
		ggloblnod(s->def, n->type->width);
	}
}

void
Bputdot(Biobuf *b)
{
	// put out middle dot ·
	Bputc(b, 0xc2);
	Bputc(b, 0xb7);
}

void
outhist(Biobuf *b)
{
	Hist *h;
	char *p, *q, *op;
	int n;

	for(h = hist; h != H; h = h->link) {
		p = h->name;
		op = 0;

		if(p && p[0] != '/' && h->offset == 0 && pathname && pathname[0] == '/') {
			op = p;
			p = pathname;
		}

		while(p) {
			q = utfrune(p, '/');
			if(q) {
				n = q-p;
				if(n == 0)
					n = 1;		// leading "/"
				q++;
			} else {
				n = strlen(p);
				q = 0;
			}
			if(n)
				zfile(b, p, n);
			p = q;
			if(p == 0 && op) {
				p = op;
				op = 0;
			}
		}

		zhist(b, h->line, h->offset);
	}
}

void
ieeedtod(uint64 *ieee, double native)
{
	double fr, ho, f;
	int exp;
	uint32 h, l;

	if(native < 0) {
		ieeedtod(ieee, -native);
		*ieee |= 1ULL<<63;
		return;
	}
	if(native == 0) {
		*ieee = 0;
		return;
	}
	fr = frexp(native, &exp);
	f = 2097152L;		/* shouldnt use fp constants here */
	fr = modf(fr*f, &ho);
	h = ho;
	h &= 0xfffffL;
	h |= (exp+1022L) << 20;
	f = 65536L;
	fr = modf(fr*f, &ho);
	l = ho;
	l <<= 16;
	l |= (int32)(fr*f);
	*ieee = ((uint64)h << 32) | l;
}

int
duint8(Sym *s, int off, uint8 v)
{
	return duintxx(s, off, v, 1);
}

int
duint16(Sym *s, int off, uint16 v)
{
	return duintxx(s, off, v, 2);
}

int
duint32(Sym *s, int off, uint32 v)
{
	return duintxx(s, off, v, 4);
}

int
duint64(Sym *s, int off, uint64 v)
{
	return duintxx(s, off, v, 8);
}

int
duintptr(Sym *s, int off, uint64 v)
{
	return duintxx(s, off, v, widthptr);
}