glsl2: Make the dead code handler make its own talloc context.

This way, we don't need to pass in a parse state, and the context
doesn't grow with the number of passes through optimization.

src/glsl/ir_dead_code.cpp

@@ -146,13 +146,12 @@ ir_dead_code_visitor::visit_leave(ir_assignment *ir)
  * for usage on an unlinked instruction stream.
  */
 bool
-do_dead_code(struct _mesa_glsl_parse_state *state,
-	     exec_list *instructions)
+do_dead_code(exec_list *instructions)
 {
    ir_dead_code_visitor v;
    bool progress = false;
 
-   v.mem_ctx = state;
+   v.mem_ctx = talloc_new(NULL);
    v.run(instructions);
 
    foreach_iter(exec_list_iterator, iter, v.variable_list) {
@@ -188,6 +187,8 @@ do_dead_code(struct _mesa_glsl_parse_state *state,
 	 progress = true;
       }
    }
+   talloc_free(v.mem_ctx);
+
    return progress;
 }
 
@@ -199,8 +200,7 @@ do_dead_code(struct _mesa_glsl_parse_state *state,
  * with global scope.
  */
 bool
-do_dead_code_unlinked(struct _mesa_glsl_parse_state *state,
-		      exec_list *instructions)
+do_dead_code_unlinked(exec_list *instructions)
 {
    bool progress = false;
 
@@ -211,7 +211,7 @@ do_dead_code_unlinked(struct _mesa_glsl_parse_state *state,
 	 foreach_iter(exec_list_iterator, sigiter, *f) {
 	    ir_function_signature *sig =
 	       (ir_function_signature *) sigiter.get();
-	    if (do_dead_code(state, &sig->body))
+	    if (do_dead_code(&sig->body))
 	       progress = true;
 	 }
       }

src/glsl/ir_optimization.h

@@ -33,11 +33,9 @@ bool do_constant_folding(exec_list *instructions);
 bool do_constant_variable(exec_list *instructions);
 bool do_constant_variable_unlinked(exec_list *instructions);
 bool do_copy_propagation(exec_list *instructions);
-bool do_dead_code(struct _mesa_glsl_parse_state *state,
-		  exec_list *instructions);
+bool do_dead_code(exec_list *instructions);
 bool do_dead_code_local(exec_list *instructions);
-bool do_dead_code_unlinked(struct _mesa_glsl_parse_state *state,
-			   exec_list *instructions);
+bool do_dead_code_unlinked(exec_list *instructions);
 bool do_div_to_mul_rcp(exec_list *instructions);
 bool do_function_inlining(exec_list *instructions);
 bool do_if_return(exec_list *instructions);

src/glsl/main.cpp

@@ -162,7 +162,7 @@ compile_shader(struct gl_shader *shader)
 	 progress = do_if_simplification(shader->ir) || progress;
 	 progress = do_copy_propagation(shader->ir) || progress;
 	 progress = do_dead_code_local(shader->ir) || progress;
-	 progress = do_dead_code_unlinked(state, shader->ir) || progress;
+	 progress = do_dead_code_unlinked(shader->ir) || progress;
 	 progress = do_constant_variable_unlinked(shader->ir) || progress;
 	 progress = do_constant_folding(shader->ir) || progress;
 	 progress = do_algebraic(shader->ir) || progress;

src/mesa/program/ir_to_mesa.cpp

@@ -2237,7 +2237,7 @@ _mesa_glsl_compile_shader(GLcontext *ctx, struct gl_shader *shader)
 	 progress = do_if_simplification(shader->ir) || progress;
 	 progress = do_copy_propagation(shader->ir) || progress;
 	 progress = do_dead_code_local(shader->ir) || progress;
-	 progress = do_dead_code_unlinked(state, shader->ir) || progress;
+	 progress = do_dead_code_unlinked(shader->ir) || progress;
 	 progress = do_constant_variable_unlinked(shader->ir) || progress;
 	 progress = do_constant_folding(shader->ir) || progress;
 	 progress = do_algebraic(shader->ir) || progress;