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glsl: Clean-up spurious error message on bad structure definitions

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Previously a shader like

int X;
struct X { int i; };

void main() { gl_Position = vec4(0.0); }

would generate two error message:

0:2(19): error: struct `X' previously defined
0:2(20): error: incomplete declaration

The first one is the real error, and the second is spurious.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Ian Romanick 2011-10-25 17:49:07 -07:00
parent a04211ecb8
commit f5ba4d055e
1 changed files with 24 additions and 6 deletions
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30
src/glsl/ast_to_hir.cpp
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@ -2455,14 +2455,32 @@ ast_declarator_list::hir(exec_list *instructions,
decl_type = this->type->specifier->glsl_type(& type_name, state);
if (this->declarations.is_empty()) {
if (decl_type != NULL) {
/* Warn if this empty declaration is not for declaring a structure.
*/
if (this->type->specifier->structure == NULL) {
/* If there is no structure involved in the program text, there are two
* possible scenarios:
*
* - The program text contained something like 'vec4;'. This is an
* empty declaration. It is valid but weird. Emit a warning.
*
* - The program text contained something like 'S;' and 'S' is not the
* name of a known structure type. This is both invalid and weird.
* Emit an error.
*
* Note that if decl_type is NULL and there is a structure involved,
* there must have been some sort of error with the structure. In this
* case we assume that an error was already generated on this line of
* code for the structure. There is no need to generate an additional,
* confusing error.
*/
assert(this->type->specifier->structure == NULL || decl_type != NULL
|| state->error);
if (this->type->specifier->structure == NULL) {
if (decl_type != NULL) {
_mesa_glsl_warning(&loc, state, "empty declaration");
} else {
_mesa_glsl_error(&loc, state,
"invalid type `%s' in empty declaration",
type_name);
}
} else {
_mesa_glsl_error(& loc, state, "incomplete declaration");
}
}