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/*
Ming, an SWF output library
Copyright (C) 2002 Opaque Industries - http://www.opaque.net/
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "assembler.h"
#include "compile.h"
#include "action.h"
int len;
Buffer asmBuffer;
int nLabels;
struct label
{
char *name;
int offset;
};
struct label labels[256];
static int
findLabel(char *label)
{
int i;
for ( i=0; i<nLabels; ++i )
{
if ( strcmp(label, labels[i].name) == 0 )
return i;
}
return -1;
}
static void
addLabel(char *label)
{
int i = findLabel(label);
if ( i == -1 )
{
labels[nLabels].name = strdup(label);
labels[nLabels].offset = len;
++nLabels;
}
else
labels[i].offset = len;
}
int
bufferBranchTarget(Buffer output, char *label)
{
int i = findLabel(label);
if ( i == -1 )
{
i = nLabels;
addLabel(label);
}
return bufferWriteS16(output, i);
}
void
bufferPatchTargets(Buffer buffer)
{
int l, i = 0;
unsigned char *output = buffer->buffer;
while ( i < len )
{
if ( output[i] & 0x80 ) /* then it's a multibyte instruction */
{
if ( output[i] == SWFACTION_BRANCHALWAYS ||
output[i] == SWFACTION_BRANCHIFTRUE )
{
int target, offset;
i += 3; /* plus instruction plus two-byte length */
target = output[i];
offset = labels[target].offset - (i+2);
output[i] = offset & 0xff;
output[++i] = (offset>>8) & 0xff;
++i;
}
else
{
++i;
l = output[i];
++i;
l += output[i]<<8;
i += l+1;
}
}
else
++i;
}
}
/*
* Local variables:
* tab-width: 2
* c-basic-offset: 2
* End:
*/
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