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authorNicolai Hähnle <[email protected]>2017-06-22 12:12:44 +0200
committerNicolai Hähnle <[email protected]>2017-07-05 12:25:21 +0200
commit727e8ba1331f64f831626da7ca8961b560e58c5c (patch)
tree22eb61387ad8ab8e711e7afc061ccb340e171c20
parenta2b02c4948a7cecfdd64859a9375641573497cd0 (diff)
glsl: look for multiple variables simultaneously with find_assignment_visitor
Save some passes over the IR. v2: redesign to make the users of find_assignments more readable v3: - fix missing ! - add some comments and make the num_found check more explicit (Timothy) Reviewed-by: Ian Romanick <[email protected]> (v1) Reviewed-by: Timothy Arceri <[email protected]>
-rw-r--r--src/compiler/glsl/linker.cpp122
1 files changed, 81 insertions, 41 deletions
diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index 15295da97e4..6ddf0cbb0ce 100644
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -90,27 +90,31 @@
namespace {
+struct find_variable {
+ const char *name;
+ bool found;
+
+ find_variable(const char *name) : name(name), found(false) {}
+};
+
/**
* Visitor that determines whether or not a variable is ever written.
+ *
+ * Use \ref find_assignments for convenience.
*/
class find_assignment_visitor : public ir_hierarchical_visitor {
public:
- find_assignment_visitor(const char *name)
- : name(name), found(false)
+ find_assignment_visitor(unsigned num_vars,
+ find_variable * const *vars)
+ : num_variables(num_vars), num_found(0), variables(vars)
{
- /* empty */
}
virtual ir_visitor_status visit_enter(ir_assignment *ir)
{
ir_variable *const var = ir->lhs->variable_referenced();
- if (strcmp(name, var->name) == 0) {
- found = true;
- return visit_stop;
- }
-
- return visit_continue_with_parent;
+ return check_variable_name(var->name);
}
virtual ir_visitor_status visit_enter(ir_call *ir)
@@ -123,35 +127,71 @@ public:
if (sig_param->data.mode == ir_var_function_out ||
sig_param->data.mode == ir_var_function_inout) {
ir_variable *var = param_rval->variable_referenced();
- if (var && strcmp(name, var->name) == 0) {
- found = true;
+ if (var && check_variable_name(var->name) == visit_stop)
return visit_stop;
- }
}
}
if (ir->return_deref != NULL) {
ir_variable *const var = ir->return_deref->variable_referenced();
- if (strcmp(name, var->name) == 0) {
- found = true;
+ if (check_variable_name(var->name) == visit_stop)
return visit_stop;
- }
}
return visit_continue_with_parent;
}
- bool variable_found()
+private:
+ ir_visitor_status check_variable_name(const char *name)
{
- return found;
+ for (unsigned i = 0; i < num_variables; ++i) {
+ if (strcmp(variables[i]->name, name) == 0) {
+ if (!variables[i]->found) {
+ variables[i]->found = true;
+
+ assert(num_found < num_variables);
+ if (++num_found == num_variables)
+ return visit_stop;
+ }
+ break;
+ }
+ }
+
+ return visit_continue_with_parent;
}
private:
- const char *name; /**< Find writes to a variable with this name. */
- bool found; /**< Was a write to the variable found? */
+ unsigned num_variables; /**< Number of variables to find */
+ unsigned num_found; /**< Number of variables already found */
+ find_variable * const *variables; /**< Variables to find */
};
+/**
+ * Determine whether or not any of NULL-terminated list of variables is ever
+ * written to.
+ */
+static void
+find_assignments(exec_list *ir, find_variable * const *vars)
+{
+ unsigned num_variables = 0;
+
+ for (find_variable * const *v = vars; *v; ++v)
+ num_variables++;
+
+ find_assignment_visitor visitor(num_variables, vars);
+ visitor.run(ir);
+}
+
+/**
+ * Determine whether or not the given variable is ever written to.
+ */
+static void
+find_assignments(exec_list *ir, find_variable *var)
+{
+ find_assignment_visitor visitor(1, &var);
+ visitor.run(ir);
+}
/**
* Visitor that determines whether or not a variable is ever read.
@@ -567,11 +607,16 @@ analyze_clip_cull_usage(struct gl_shader_program *prog,
* gl_ClipVertex nor gl_ClipDistance. However with
* GL_EXT_clip_cull_distance, this functionality is exposed in ES 3.0.
*/
- find_assignment_visitor clip_distance("gl_ClipDistance");
- find_assignment_visitor cull_distance("gl_CullDistance");
-
- clip_distance.run(shader->ir);
- cull_distance.run(shader->ir);
+ find_variable gl_ClipDistance("gl_ClipDistance");
+ find_variable gl_CullDistance("gl_CullDistance");
+ find_variable gl_ClipVertex("gl_ClipVertex");
+ find_variable * const variables[] = {
+ &gl_ClipDistance,
+ &gl_CullDistance,
+ !prog->IsES ? &gl_ClipVertex : NULL,
+ NULL
+ };
+ find_assignments(shader->ir, variables);
/* From the ARB_cull_distance spec:
*
@@ -583,17 +628,13 @@ analyze_clip_cull_usage(struct gl_shader_program *prog,
* gl_ClipVertex.
*/
if (!prog->IsES) {
- find_assignment_visitor clip_vertex("gl_ClipVertex");
-
- clip_vertex.run(shader->ir);
-
- if (clip_vertex.variable_found() && clip_distance.variable_found()) {
+ if (gl_ClipVertex.found && gl_ClipDistance.found) {
linker_error(prog, "%s shader writes to both `gl_ClipVertex' "
"and `gl_ClipDistance'\n",
_mesa_shader_stage_to_string(shader->Stage));
return;
}
- if (clip_vertex.variable_found() && cull_distance.variable_found()) {
+ if (gl_ClipVertex.found && gl_CullDistance.found) {
linker_error(prog, "%s shader writes to both `gl_ClipVertex' "
"and `gl_CullDistance'\n",
_mesa_shader_stage_to_string(shader->Stage));
@@ -601,13 +642,13 @@ analyze_clip_cull_usage(struct gl_shader_program *prog,
}
}
- if (clip_distance.variable_found()) {
+ if (gl_ClipDistance.found) {
ir_variable *clip_distance_var =
shader->symbols->get_variable("gl_ClipDistance");
assert(clip_distance_var);
*clip_distance_array_size = clip_distance_var->type->length;
}
- if (cull_distance.variable_found()) {
+ if (gl_CullDistance.found) {
ir_variable *cull_distance_var =
shader->symbols->get_variable("gl_CullDistance");
assert(cull_distance_var);
@@ -676,9 +717,9 @@ validate_vertex_shader_executable(struct gl_shader_program *prog,
* gl_Position is not an error.
*/
if (prog->data->Version < (prog->IsES ? 300 : 140)) {
- find_assignment_visitor find("gl_Position");
- find.run(shader->ir);
- if (!find.variable_found()) {
+ find_variable gl_Position("gl_Position");
+ find_assignments(shader->ir, &gl_Position);
+ if (!gl_Position.found) {
if (prog->IsES) {
linker_warning(prog,
"vertex shader does not write to `gl_Position'. "
@@ -722,13 +763,12 @@ validate_fragment_shader_executable(struct gl_shader_program *prog,
if (shader == NULL)
return;
- find_assignment_visitor frag_color("gl_FragColor");
- find_assignment_visitor frag_data("gl_FragData");
-
- frag_color.run(shader->ir);
- frag_data.run(shader->ir);
+ find_variable gl_FragColor("gl_FragColor");
+ find_variable gl_FragData("gl_FragData");
+ find_variable * const variables[] = { &gl_FragColor, &gl_FragData, NULL };
+ find_assignments(shader->ir, variables);
- if (frag_color.variable_found() && frag_data.variable_found()) {
+ if (gl_FragColor.found && gl_FragData.found) {
linker_error(prog, "fragment shader writes to both "
"`gl_FragColor' and `gl_FragData'\n");
}