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glsl/pp: Fix handling of if/elif/else cases.

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Once if/elif evalutes to true, all subsequent conditions are always false.
This commit is contained in:
Michal Krol
2010-02-15 21:33:22 +01:00
parent b90f265fbf
commit ee67167358
2 changed files with 28 additions and 11 deletions
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11
src/glsl/pp/sl_pp_context.h
View File

@@ -53,6 +53,15 @@ struct sl_pp_predefined {
int value;
};
union sl_pp_if_state {
struct {
unsigned int condition:1;
unsigned int went_thru_else:1;
unsigned int had_true_cond:1;
} u;
unsigned int value;
};
struct sl_pp_context {
char *cstr_pool;
unsigned int cstr_pool_max;
@@ -68,7 +77,7 @@ struct sl_pp_context {
struct sl_pp_predefined predefined[SL_PP_MAX_PREDEFINED];
unsigned int num_predefined;
unsigned int if_stack[SL_PP_MAX_IF_NESTING];
union sl_pp_if_state if_stack[SL_PP_MAX_IF_NESTING];
unsigned int if_ptr;
unsigned int if_value;

28
src/glsl/pp/sl_pp_if.c
View File

@@ -108,7 +108,7 @@ _evaluate_if_stack(struct sl_pp_context *context)
unsigned int i;
for (i = context->if_ptr; i < SL_PP_MAX_IF_NESTING; i++) {
if (!(context->if_stack[i] & 1)) {
if (!context->if_stack[i].u.condition) {
return 0;
}
}
@@ -182,7 +182,8 @@ _parse_if(struct sl_pp_context *context,
free(state.out);
context->if_ptr--;
context->if_stack[context->if_ptr] = result ? 1 : 0;
context->if_stack[context->if_ptr].value = 0;
context->if_stack[context->if_ptr].u.condition = result ? 1 : 0;
context->if_value = _evaluate_if_stack(context);
return 0;
@@ -191,19 +192,24 @@ _parse_if(struct sl_pp_context *context,
static int
_parse_else(struct sl_pp_context *context)
{
union sl_pp_if_state *state = &context->if_stack[context->if_ptr];
if (context->if_ptr == SL_PP_MAX_IF_NESTING) {
strcpy(context->error_msg, "no matching `#if'");
return -1;
}
/* Bit b1 indicates we already went through #else. */
if (context->if_stack[context->if_ptr] & 2) {
if (state->u.went_thru_else) {
strcpy(context->error_msg, "no matching `#if'");
return -1;
}
/* Invert current condition value and mark that we are in the #else block. */
context->if_stack[context->if_ptr] = (1 - (context->if_stack[context->if_ptr] & 1)) | 2;
/* Once we had a true condition, the subsequent #elifs should always be false. */
state->u.had_true_cond |= state->u.condition;
/* Update current condition value and mark that we are in the #else block. */
state->u.condition = !(state->u.had_true_cond | state->u.condition);
state->u.went_thru_else = 1;
context->if_value = _evaluate_if_stack(context);
return 0;
@@ -233,7 +239,8 @@ sl_pp_process_ifdef(struct sl_pp_context *context,
switch (input[i].token) {
case SL_PP_IDENTIFIER:
context->if_ptr--;
context->if_stack[context->if_ptr] = _macro_is_defined(context, input[i].data.identifier);
context->if_stack[context->if_ptr].value = 0;
context->if_stack[context->if_ptr].u.condition = _macro_is_defined(context, input[i].data.identifier);
context->if_value = _evaluate_if_stack(context);
return 0;
@@ -267,7 +274,8 @@ sl_pp_process_ifndef(struct sl_pp_context *context,
switch (input[i].token) {
case SL_PP_IDENTIFIER:
context->if_ptr--;
context->if_stack[context->if_ptr] = !_macro_is_defined(context, input[i].data.identifier);
context->if_stack[context->if_ptr].value = 0;
context->if_stack[context->if_ptr].u.condition = !_macro_is_defined(context, input[i].data.identifier);
context->if_value = _evaluate_if_stack(context);
return 0;
@@ -292,7 +300,7 @@ sl_pp_process_elif(struct sl_pp_context *context,
return -1;
}
if (context->if_stack[context->if_ptr] & 1) {
if (context->if_stack[context->if_ptr].u.condition) {
context->if_ptr++;
if (_parse_if(context, buffer)) {
return -1;
@@ -300,7 +308,7 @@ sl_pp_process_elif(struct sl_pp_context *context,
}
/* We are still in the #if block. */
context->if_stack[context->if_ptr] = context->if_stack[context->if_ptr] & ~2;
context->if_stack[context->if_ptr].u.went_thru_else = 0;
return 0;
}