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/**
* Functions for managing instruction labels.
* Basically, this is used to manage the problem of forward branches where
* we have a branch instruciton but don't know the target address yet.
*/
#include "slang_label.h"
#include "slang_mem.h"
slang_label *
_slang_label_new(const char *name)
{
slang_label *l = (slang_label *) _slang_alloc(sizeof(slang_label));
if (l) {
l->Name = _slang_strdup(name);
l->Location = -1;
}
return l;
}
/**
* As above, but suffix the name with a unique number.
*/
slang_label *
_slang_label_new_unique(const char *name)
{
static int id = 1;
slang_label *l = (slang_label *) _slang_alloc(sizeof(slang_label));
if (l) {
l->Name = (char *) _slang_alloc(strlen(name) + 10);
if (!l->Name) {
free(l);
return NULL;
}
sprintf(l->Name, "%s_%d", name, id);
id++;
l->Location = -1;
}
return l;
}
void
_slang_label_delete(slang_label *l)
{
if (l->Name) {
_slang_free(l->Name);
l->Name = NULL;
}
if (l->References) {
_slang_free(l->References);
l->References = NULL;
}
_slang_free(l);
}
void
_slang_label_add_reference(slang_label *l, GLuint inst)
{
const GLuint oldSize = l->NumReferences * sizeof(GLuint);
assert(l->Location < 0);
l->References = _slang_realloc(l->References,
oldSize, oldSize + sizeof(GLuint));
if (l->References) {
l->References[l->NumReferences] = inst;
l->NumReferences++;
}
}
GLint
_slang_label_get_location(const slang_label *l)
{
return l->Location;
}
void
_slang_label_set_location(slang_label *l, GLint location,
struct gl_program *prog)
{
GLuint i;
assert(l->Location < 0);
assert(location >= 0);
l->Location = location;
/* for the instructions that were waiting to learn the label's location: */
for (i = 0; i < l->NumReferences; i++) {
const GLuint j = l->References[i];
prog->Instructions[j].BranchTarget = location;
}
if (l->References) {
_slang_free(l->References);
l->References = NULL;
}
}
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