glsl: report no function instead of empty candidate list

When generating the error message for a missing function error where
all available overloads were missing due to a too low GLSL version, we
used to report something like this:

---8<---
0:224(14): error: no matching function for call to
           `textureCubeLod(samplerCube, vec3, float)'; candidates are:
0:224(14): error: type mismatch
---8<---

This is a pretty confusing error message, and can throw people off when
debugging. So let's instead check if any overload is available before we
decide what to print. This allow us to report something like this
instead:

---8<---
0:224(14): error: no function with name 'textureCubeLod'
0:224(14): error: type mismatch
---8<---

This is arguably easier to understand for programmers, and doesn't send
you on a wild goose chase to figure out what argument is wrong just
because you stopped reading the message prematurely. I'm of course
referring to a friend, not me. For sure. I would never do that.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

diff --git a/src/compiler/glsl/ast_function.cpp b/src/compiler/glsl/ast_function.cpp
index 80cbb582b0e849fbdf150a4937db0d3cb7ff8e17..0ed47660e2239f7a43ebff22e4c6dc7897c71b5e 100644 (file)
--- a/src/compiler/glsl/ast_function.cpp
+++ b/src/compiler/glsl/ast_function.cpp
@@ -748,6 +748,21 @@ generate_array_index(void *mem_ctx, exec_list *instructions,
    }
 }
 
+static bool
+function_exists(_mesa_glsl_parse_state *state,
+                struct glsl_symbol_table *symbols, const char *name)
+{
+   ir_function *f = symbols->get_function(name);
+   if (f != NULL) {
+      foreach_in_list(ir_function_signature, sig, &f->signatures) {
+         if (sig->is_builtin() && !sig->is_builtin_available(state))
+            continue;
+         return true;
+      }
+   }
+   return false;
+}
+
 static void
 print_function_prototypes(_mesa_glsl_parse_state *state, YYLTYPE *loc,
                           ir_function *f)
@@ -778,9 +793,9 @@ no_matching_function_error(const char *name,
 {
    gl_shader *sh = _mesa_glsl_get_builtin_function_shader();
 
-   if (state->symbols->get_function(name) == NULL
+   if (!function_exists(state, state->symbols, name)
        && (!state->uses_builtin_functions
-           || sh->symbols->get_function(name) == NULL)) {
+           || !function_exists(state, sh->symbols, name))) {
       _mesa_glsl_error(loc, state, "no function with name '%s'", name);
    } else {
       char *str = prototype_string(NULL, name, actual_parameters);