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glsl: Explicitly NULL-check variables before making a dereference. 

The constructor currently returns a ir_dereference_variable of error
type when provided NULL, but that's about to change in the next commit.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2012-03-13 14:59:42 -07:00
parent 2cd652f810
commit dca19a7711
1 changed files with 2 additions and 2 deletions
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4
src/glsl/ast_to_hir.cpp
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@ -1692,14 +1692,14 @@ ast_expression::hir(exec_list *instructions,
ir_variable *var =
state->symbols->get_variable(this->primary_expression.identifier);
result = new(ctx) ir_dereference_variable(var);
if (var != NULL) {
var->used = true;
result = new(ctx) ir_dereference_variable(var);
} else {
_mesa_glsl_error(& loc, state, "`%s' undeclared",
this->primary_expression.identifier);
result = ir_call::get_error_instruction(ctx);
error_emitted = true;
}
break;