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#include "imports.h"
#include "slang_compile.h"
#include "slang_compile_variable.h"
#include "slang_vartable.h"
#include "slang_ir.h"
static int dbg = 0;
typedef enum {
FREE,
VAR,
TEMP
} TempState;
static int Level = 0;
struct slang_var_table_
{
int level;
int num_entries;
slang_variable **vars; /* array [num_entries] */
TempState temps[MAX_PROGRAM_TEMPS];
struct slang_var_table_ *parent;
};
/**
* Create new table, put at head, return ptr to it.
*/
slang_var_table *
_slang_push_var_table(slang_var_table *parent)
{
slang_var_table *t
= (slang_var_table *) _mesa_calloc(sizeof(slang_var_table));
if (t) {
t->level = Level++;
t->parent = parent;
if (parent) {
/* copy the info indicating which temp regs are in use */
memcpy(t->temps, parent->temps, sizeof(t->temps));
}
if (dbg) printf("Pushing level %d\n", t->level);
}
return t;
}
/**
* Destroy given table, return ptr to parent
*/
slang_var_table *
_slang_pop_var_table(slang_var_table *t)
{
slang_var_table *parent = t->parent;
int i;
if (dbg) printf("Popping level %d\n", t->level);
/* free the storage allocated for each variable */
for (i = 0; i < t->num_entries; i++) {
slang_ir_storage *store = (slang_ir_storage *) t->vars[i]->aux;
if (dbg) printf(" Free var %s\n", (char*) t->vars[i]->a_name);
assert(t->temps[store->Index] == VAR);
t->temps[store->Index] = FREE;
store->Index = -1;
}
if (t->parent) {
/* just verify that any remaining allocations in this scope
* were for temps
*/
for (i = 0; i < MAX_PROGRAM_TEMPS; i++) {
if (t->temps[i] && !t->parent->temps[i]) {
if (dbg) printf(" Free reg %d\n", i);
assert(t->temps[i] == TEMP);
}
}
}
if (t->vars)
free(t->vars);
free(t);
Level--;
return parent;
}
/**
* Add a new variable to the given symbol table.
*/
void
_slang_add_variable(slang_var_table *t, slang_variable *v)
{
assert(t);
if (dbg) printf("Adding var %s\n", (char *) v->a_name);
t->vars = realloc(t->vars, (t->num_entries + 1) * sizeof(slang_variable *));
t->vars[t->num_entries] = v;
t->num_entries++;
}
/**
* Look for variable by name in given table.
* If not found, parent table will be searched.
*/
slang_variable *
_slang_find_variable(const slang_var_table *t, slang_atom name)
{
while (1) {
int i;
for (i = 0; i < t->num_entries; i++) {
if (t->vars[i]->a_name == name)
return t->vars[i];
}
if (t->parent)
t = t->parent;
else
return NULL;
}
}
static GLint
alloc_reg(slang_var_table *t, GLint size, GLboolean isTemp)
{
const GLuint sz4 = (size + 3) / 4;
GLuint i, j;
assert(size > 0); /* number of floats */
for (i = 0; i < MAX_PROGRAM_TEMPS; i++) {
GLuint found = 0;
for (j = 0; j < sz4; j++) {
if (!t->temps[i + j]) {
found++;
}
else {
break;
}
}
if (found == sz4) {
/* found block of size/4 free regs */
for (j = 0; j < sz4; j++)
t->temps[i + j] = isTemp ? TEMP : VAR;
return i;
}
}
return -1;
}
/**
* Allocate temp register(s) for storing a variable.
*/
GLint
_slang_alloc_var(slang_var_table *t, GLint size)
{
int i = alloc_reg(t, size, GL_FALSE);
if (dbg) printf("Alloc var %d (level %d)\n", i, t->level);
return i;
}
void
_slang_reserve_var(slang_var_table *t, GLint r, GLint size)
{
const GLint sz4 = (size + 3) / 4;
GLint i;
for (i = 0; i < sz4; i++) {
t->temps[r + i] = VAR;
}
}
/**
* Allocate temp register(s) for storing an unnamed intermediate value.
*/
GLint
_slang_alloc_temp(slang_var_table *t, GLint size)
{
int i = alloc_reg(t, size, GL_TRUE);
if (dbg) printf("Alloc temp %d (level %d)\n", i, t->level);
return i;
}
void
_slang_free_temp(slang_var_table *t, GLint r, GLint size)
{
const GLuint sz4 = (size + 3) / 4;
GLuint i;
assert(size > 0);
assert(r >= 0);
assert(r < MAX_PROGRAM_TEMPS);
if (dbg) printf("Free temp %d (level %d)\n", r, t->level);
for (i = 0; i < sz4; i++) {
assert(t->temps[r + i] == TEMP);
t->temps[r + i] = FREE;
}
}
GLboolean
_slang_is_temp(slang_var_table *t, GLint r)
{
assert(r >= 0);
assert(r < MAX_PROGRAM_TEMPS);
if (t->temps[r] == TEMP)
return GL_TRUE;
else
return GL_FALSE;
}
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