mesa: glsl compiler debug code

RETURN0 macro reports file/line before returning zero.

1 files changed, 151 insertions, 141 deletions

diff --git a/src/mesa/shader/slang/slang_compile.c b/src/mesa/shader/slang/slang_compile.c
index 72b83c04224..07c40eaa324 100644
--- a/src/mesa/shader/slang/slang_compile.c
+++ b/src/mesa/shader/slang/slang_compile.c
@@ -167,6 +167,16 @@ typedef struct slang_output_ctx_
 
 /* _slang_compile() */
 
+
+/* Debugging aid, print file/line where parsing error is detected */
+#define RETURN0 \
+   do { \
+      if (0) \
+         printf("slang error at %s:%d\n", __FILE__, __LINE__); \
+      return 0; \
+   } while (0)
+
+
 static void
 parse_identifier_str(slang_parse_ctx * C, char **id)
 {
@@ -223,7 +233,7 @@ parse_float(slang_parse_ctx * C, float *number)
                                   _mesa_strlen(exponent) + 3) * sizeof(char));
    if (whole == NULL) {
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
 
    slang_string_copy(whole, integral);
@@ -247,7 +257,7 @@ check_revision(slang_parse_ctx * C)
 {
    if (*C->I != REVISION) {
       slang_info_log_error(C->L, "Internal compiler error.");
-      return 0;
+      RETURN0;
    }
    C->I++;
    return 1;
@@ -387,23 +397,23 @@ parse_struct_field(slang_parse_ctx * C, slang_output_ctx * O,
 
    o.structs = st->structs;
    if (!parse_type_specifier(C, &o, sp))
-      return 0;
+      RETURN0;
 
    do {
       slang_atom a_name;
       slang_variable *var = slang_variable_scope_grow(st->fields);
       if (!var) {
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       a_name = parse_identifier(C);
       if (_slang_locate_variable(st->fields, a_name, GL_FALSE)) {
          slang_info_log_error(C->L, "duplicate field '%s'", (char *) a_name);
-         return 0;
+         RETURN0;
       }
 
       if (!parse_struct_field_var(C, &o, var, a_name, sp))
-         return 0;
+         RETURN0;
    }
    while (*C->I++ != FIELD_NONE);
 
@@ -419,26 +429,26 @@ parse_struct(slang_parse_ctx * C, slang_output_ctx * O, slang_struct ** st)
    /* parse struct name (if any) and make sure it is unique in current scope */
    a_name = parse_identifier(C);
    if (a_name == SLANG_ATOM_NULL)
-      return 0;
+      RETURN0;
 
    name = slang_atom_pool_id(C->atoms, a_name);
    if (name[0] != '\0'
        && slang_struct_scope_find(O->structs, a_name, 0) != NULL) {
       slang_info_log_error(C->L, "%s: duplicate type name.", name);
-      return 0;
+      RETURN0;
    }
 
    /* set-up a new struct */
    *st = (slang_struct *) _slang_alloc(sizeof(slang_struct));
    if (*st == NULL) {
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
    if (!slang_struct_construct(*st)) {
       _slang_free(*st);
       *st = NULL;
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
    (**st).a_name = a_name;
    (**st).structs->outer_scope = O->structs;
@@ -450,7 +460,7 @@ parse_struct(slang_parse_ctx * C, slang_output_ctx * O, slang_struct ** st)
       slang_type_specifier_ctr(&sp);
       if (!parse_struct_field(C, O, *st, &sp)) {
          slang_type_specifier_dtr(&sp);
-         return 0;
+         RETURN0;
       }
       slang_type_specifier_dtr(&sp);
    }
@@ -468,14 +478,14 @@ parse_struct(slang_parse_ctx * C, slang_output_ctx * O, slang_struct ** st)
                                          * sizeof(slang_struct));
       if (O->structs->structs == NULL) {
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       s = &O->structs->structs[O->structs->num_structs];
       if (!slang_struct_construct(s))
-         return 0;
+         RETURN0;
       O->structs->num_structs++;
       if (!slang_struct_copy(s, *st))
-         return 0;
+         RETURN0;
    }
 
    return 1;
@@ -498,7 +508,7 @@ parse_type_variant(slang_parse_ctx * C, slang_type_variant *variant)
       *variant = SLANG_INVARIANT;
       return 1;
    default:
-      return 0;
+      RETURN0;
    }
 }
 
@@ -519,7 +529,7 @@ parse_type_centroid(slang_parse_ctx * C, slang_type_centroid *centroid)
       *centroid = SLANG_CENTROID;
       return 1;
    default:
-      return 0;
+      RETURN0;
    }
 }
 
@@ -560,7 +570,7 @@ parse_type_qualifier(slang_parse_ctx * C, slang_type_qualifier * qual)
       *qual = SLANG_QUAL_FIXEDINPUT;
       break;
    default:
-      return 0;
+      RETURN0;
    }
    return 1;
 }
@@ -698,7 +708,7 @@ parse_type_specifier(slang_parse_ctx * C, slang_output_ctx * O,
    case TYPE_SPECIFIER_STRUCT:
       spec->type = SLANG_SPEC_STRUCT;
       if (!parse_struct(C, O, &spec->_struct))
-         return 0;
+         RETURN0;
       break;
    case TYPE_SPECIFIER_TYPENAME:
       spec->type = SLANG_SPEC_STRUCT;
@@ -708,31 +718,31 @@ parse_type_specifier(slang_parse_ctx * C, slang_output_ctx * O,
 
          a_name = parse_identifier(C);
          if (a_name == NULL)
-            return 0;
+            RETURN0;
 
          stru = slang_struct_scope_find(O->structs, a_name, 1);
          if (stru == NULL) {
             slang_info_log_error(C->L, "undeclared type name '%s'",
                                  slang_atom_pool_id(C->atoms, a_name));
-            return 0;
+            RETURN0;
          }
 
          spec->_struct = (slang_struct *) _slang_alloc(sizeof(slang_struct));
          if (spec->_struct == NULL) {
             slang_info_log_memory(C->L);
-            return 0;
+            RETURN0;
          }
          if (!slang_struct_construct(spec->_struct)) {
             _slang_free(spec->_struct);
             spec->_struct = NULL;
-            return 0;
+            RETURN0;
          }
          if (!slang_struct_copy(spec->_struct, stru))
-            return 0;
+            RETURN0;
       }
       break;
    default:
-      return 0;
+      RETURN0;
    }
    return 1;
 }
@@ -762,7 +772,7 @@ parse_type_precision(slang_parse_ctx *C,
       *precision = SLANG_PREC_HIGH;
       return 1;
    default:
-      return 0;
+      RETURN0;
    }
 }
 
@@ -771,36 +781,36 @@ parse_fully_specified_type(slang_parse_ctx * C, slang_output_ctx * O,
                            slang_fully_specified_type * type)
 {
    if (!parse_type_variant(C, &type->variant))
-      return 0;
+      RETURN0;
   
    if (!parse_type_centroid(C, &type->centroid))
-      return 0;
+      RETURN0;
 
    if (!parse_type_qualifier(C, &type->qualifier))
-      return 0;
+      RETURN0;
 
    if (!parse_type_precision(C, &type->precision))
-      return 0;
+      RETURN0;
 
    if (!parse_type_specifier(C, O, &type->specifier))
-      return 0;
+      RETURN0;
 
    if (!O->allow_invariant && type->variant == SLANG_INVARIANT) {
       slang_info_log_error(C->L,
          "'invariant' keyword not allowed (perhaps set #version 120)");
-      return 0;
+      RETURN0;
    }
 
    if (!O->allow_centroid && type->centroid == SLANG_CENTROID) {
       slang_info_log_error(C->L,
          "'centroid' keyword not allowed (perhaps set #version 120)");
-      return 0;
+      RETURN0;
    }
    else if (type->centroid == SLANG_CENTROID &&
             type->qualifier != SLANG_QUAL_VARYING) {
       slang_info_log_error(C->L,
          "'centroid' keyword only allowed for varying vars");
-      return 0;
+      RETURN0;
    }
 
 
@@ -809,7 +819,7 @@ parse_fully_specified_type(slang_parse_ctx * C, slang_output_ctx * O,
        type->variant == SLANG_INVARIANT) {
       slang_info_log_error(C->L,
                            "invariant qualifer only allowed for varying vars");
-      return 0;
+      RETURN0;
    }
    */
 
@@ -824,7 +834,7 @@ parse_fully_specified_type(slang_parse_ctx * C, slang_output_ctx * O,
       /* only default is allowed */
       if (type->precision != SLANG_PREC_DEFAULT) {
          slang_info_log_error(C->L, "precision qualifiers not allowed");
-         return 0;
+         RETURN0;
       }
    }
 
@@ -935,7 +945,7 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
       oper->type = SLANG_OPER_BLOCK_NO_NEW_SCOPE;
       while (*C->I != OP_END)
          if (!parse_child_operation(C, O, oper, 1))
-            return 0;
+            RETURN0;
       C->I++;
       break;
    case OP_BLOCK_BEGIN_NEW_SCOPE:
@@ -947,7 +957,7 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
          o.vars = oper->locals;
          while (*C->I != OP_END)
             if (!parse_child_operation(C, &o, oper, 1))
-               return 0;
+               RETURN0;
          C->I++;
       }
       break;
@@ -963,7 +973,7 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
           * than one declarators
           */
          if (!parse_declaration(C, O))
-            return 0;
+            RETURN0;
          if (first_var < O->vars->num_variables) {
             const unsigned int num_vars = O->vars->num_variables - first_var;
             unsigned int i;
@@ -972,7 +982,7 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
             oper->children = slang_operation_new(num_vars);
             if (oper->children == NULL) {
                slang_info_log_memory(C->L);
-               return 0;
+               RETURN0;
             }
             for (i = first_var; i < O->vars->num_variables; i++) {
                slang_operation *o = &oper->children[i - first_var];
@@ -983,7 +993,7 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
                if (!legal_identifier(o->a_id)) {
                   slang_info_log_error(C->L, "illegal variable name '%s'",
                                        (char *) o->a_id);
-                  return 0;
+                  RETURN0;
                }
             }
          }
@@ -996,10 +1006,10 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
       oper->type = SLANG_OPER_ASM;
       oper->a_id = parse_identifier(C);
       if (oper->a_id == SLANG_ATOM_NULL)
-         return 0;
+         RETURN0;
       while (*C->I != OP_END) {
          if (!parse_child_operation(C, O, oper, 0))
-            return 0;
+            RETURN0;
       }
       C->I++;
       break;
@@ -1015,21 +1025,21 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
    case OP_RETURN:
       oper->type = SLANG_OPER_RETURN;
       if (!parse_child_operation(C, O, oper, 0))
-         return 0;
+         RETURN0;
       break;
    case OP_EXPRESSION:
       oper->type = SLANG_OPER_EXPRESSION;
       if (!parse_child_operation(C, O, oper, 0))
-         return 0;
+         RETURN0;
       break;
    case OP_IF:
       oper->type = SLANG_OPER_IF;
       if (!parse_child_operation(C, O, oper, 0))
-         return 0;
+         RETURN0;
       if (!parse_child_operation(C, O, oper, 1))
-         return 0;
+         RETURN0;
       if (!parse_child_operation(C, O, oper, 1))
-         return 0;
+         RETURN0;
       break;
    case OP_WHILE:
       {
@@ -1038,17 +1048,17 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
          oper->type = SLANG_OPER_WHILE;
          o.vars = oper->locals;
          if (!parse_child_operation(C, &o, oper, 1))
-            return 0;
+            RETURN0;
          if (!parse_child_operation(C, &o, oper, 1))
-            return 0;
+            RETURN0;
       }
       break;
    case OP_DO:
       oper->type = SLANG_OPER_DO;
       if (!parse_child_operation(C, O, oper, 1))
-         return 0;
+         RETURN0;
       if (!parse_child_operation(C, O, oper, 0))
-         return 0;
+         RETURN0;
       break;
    case OP_FOR:
       {
@@ -1057,13 +1067,13 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
          oper->type = SLANG_OPER_FOR;
          o.vars = oper->locals;
          if (!parse_child_operation(C, &o, oper, 1))
-            return 0;
+            RETURN0;
          if (!parse_child_operation(C, &o, oper, 1))
-            return 0;
+            RETURN0;
          if (!parse_child_operation(C, &o, oper, 0))
-            return 0;
+            RETURN0;
          if (!parse_child_operation(C, &o, oper, 1))
-            return 0;
+            RETURN0;
       }
       break;
    case OP_PRECISION:
@@ -1077,7 +1087,7 @@ parse_statement(slang_parse_ctx * C, slang_output_ctx * O,
       }
       break;
    default:
-      return 0;
+      RETURN0;
    }
    return 1;
 }
@@ -1092,7 +1102,7 @@ handle_nary_expression(slang_parse_ctx * C, slang_operation * op,
    op->children = slang_operation_new(n);
    if (op->children == NULL) {
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
    op->num_children = n;
 
@@ -1110,7 +1120,7 @@ handle_nary_expression(slang_parse_ctx * C, slang_operation * op,
                      *total_ops * sizeof(slang_operation));
    if (*ops == NULL) {
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
    return 1;
 }
@@ -1143,12 +1153,12 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
                         (num_ops + 1) * sizeof(slang_operation));
       if (ops == NULL) {
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       op = &ops[num_ops];
       if (!slang_operation_construct(op)) {
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       num_ops++;
       op->locals->outer_scope = O->vars;
@@ -1160,7 +1170,7 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
       case OP_PUSH_BOOL:
          op->type = SLANG_OPER_LITERAL_BOOL;
          if (!parse_number(C, &number))
-            return 0;
+            RETURN0;
          op->literal[0] =
          op->literal[1] =
          op->literal[2] =
@@ -1170,7 +1180,7 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
       case OP_PUSH_INT:
          op->type = SLANG_OPER_LITERAL_INT;
          if (!parse_number(C, &number))
-            return 0;
+            RETURN0;
          op->literal[0] =
          op->literal[1] =
          op->literal[2] =
@@ -1180,7 +1190,7 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
       case OP_PUSH_FLOAT:
          op->type = SLANG_OPER_LITERAL_FLOAT;
          if (!parse_float(C, &op->literal[0]))
-            return 0;
+            RETURN0;
          op->literal[1] =
          op->literal[2] =
          op->literal[3] = op->literal[0];
@@ -1190,37 +1200,37 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
          op->type = SLANG_OPER_IDENTIFIER;
          op->a_id = parse_identifier(C);
          if (op->a_id == SLANG_ATOM_NULL)
-            return 0;
+            RETURN0;
          break;
       case OP_SEQUENCE:
          op->type = SLANG_OPER_SEQUENCE;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_ASSIGN:
          op->type = SLANG_OPER_ASSIGN;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_ADDASSIGN:
          op->type = SLANG_OPER_ADDASSIGN;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_SUBASSIGN:
          op->type = SLANG_OPER_SUBASSIGN;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_MULASSIGN:
          op->type = SLANG_OPER_MULASSIGN;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_DIVASSIGN:
          op->type = SLANG_OPER_DIVASSIGN;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
          /*case OP_MODASSIGN: */
          /*case OP_LSHASSIGN: */
@@ -1231,22 +1241,22 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
       case OP_SELECT:
          op->type = SLANG_OPER_SELECT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 3))
-            return 0;
+            RETURN0;
          break;
       case OP_LOGICALOR:
          op->type = SLANG_OPER_LOGICALOR;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_LOGICALXOR:
          op->type = SLANG_OPER_LOGICALXOR;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_LOGICALAND:
          op->type = SLANG_OPER_LOGICALAND;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
          /*case OP_BITOR: */
          /*case OP_BITXOR: */
@@ -1254,95 +1264,95 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
       case OP_EQUAL:
          op->type = SLANG_OPER_EQUAL;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_NOTEQUAL:
          op->type = SLANG_OPER_NOTEQUAL;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_LESS:
          op->type = SLANG_OPER_LESS;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_GREATER:
          op->type = SLANG_OPER_GREATER;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_LESSEQUAL:
          op->type = SLANG_OPER_LESSEQUAL;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_GREATEREQUAL:
          op->type = SLANG_OPER_GREATEREQUAL;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
          /*case OP_LSHIFT: */
          /*case OP_RSHIFT: */
       case OP_ADD:
          op->type = SLANG_OPER_ADD;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_SUBTRACT:
          op->type = SLANG_OPER_SUBTRACT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_MULTIPLY:
          op->type = SLANG_OPER_MULTIPLY;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_DIVIDE:
          op->type = SLANG_OPER_DIVIDE;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
          /*case OP_MODULUS: */
       case OP_PREINCREMENT:
          op->type = SLANG_OPER_PREINCREMENT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
       case OP_PREDECREMENT:
          op->type = SLANG_OPER_PREDECREMENT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
       case OP_PLUS:
          op->type = SLANG_OPER_PLUS;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
       case OP_MINUS:
          op->type = SLANG_OPER_MINUS;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
       case OP_NOT:
          op->type = SLANG_OPER_NOT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
          /*case OP_COMPLEMENT: */
       case OP_SUBSCRIPT:
          op->type = SLANG_OPER_SUBSCRIPT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 2))
-            return 0;
+            RETURN0;
          break;
       case OP_CALL:
          op->type = SLANG_OPER_CALL;
          op->a_id = parse_identifier(C);
          if (op->a_id == SLANG_ATOM_NULL)
-            return 0;
+            RETURN0;
          while (*C->I != OP_END)
             if (!parse_child_operation(C, O, op, 0))
-               return 0;
+               RETURN0;
          C->I++;
 
          if (!C->parsing_builtin
@@ -1352,7 +1362,7 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
             id = slang_atom_pool_id(C->atoms, op->a_id);
             if (!is_constructor_name(id, op->a_id, O->structs)) {
                slang_info_log_error(C->L, "%s: undeclared function name.", id);
-               return 0;
+               RETURN0;
             }
          }
          break;
@@ -1360,22 +1370,22 @@ parse_expression(slang_parse_ctx * C, slang_output_ctx * O,
          op->type = SLANG_OPER_FIELD;
          op->a_id = parse_identifier(C);
          if (op->a_id == SLANG_ATOM_NULL)
-            return 0;
+            RETURN0;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
       case OP_POSTINCREMENT:
          op->type = SLANG_OPER_POSTINCREMENT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
       case OP_POSTDECREMENT:
          op->type = SLANG_OPER_POSTDECREMENT;
          if (!handle_nary_expression(C, op, &ops, &num_ops, 1))
-            return 0;
+            RETURN0;
          break;
       default:
-         return 0;
+         RETURN0;
       }
    }
    C->I++;
@@ -1406,7 +1416,7 @@ parse_parameter_declaration(slang_parse_ctx * C, slang_output_ctx * O,
     * two at most) because not all combinations are valid
     */
    if (!parse_type_qualifier(C, &param->type.qualifier))
-      return 0;
+      RETURN0;
 
    param_qual = *C->I++;
    switch (param_qual) {
@@ -1414,7 +1424,7 @@ parse_parameter_declaration(slang_parse_ctx * C, slang_output_ctx * O,
       if (param->type.qualifier != SLANG_QUAL_CONST
           && param->type.qualifier != SLANG_QUAL_NONE) {
          slang_info_log_error(C->L, "Invalid type qualifier.");
-         return 0;
+         RETURN0;
       }
       break;
    case PARAM_QUALIFIER_OUT:
@@ -1422,7 +1432,7 @@ parse_parameter_declaration(slang_parse_ctx * C, slang_output_ctx * O,
          param->type.qualifier = SLANG_QUAL_OUT;
       else {
          slang_info_log_error(C->L, "Invalid type qualifier.");
-         return 0;
+         RETURN0;
       }
       break;
    case PARAM_QUALIFIER_INOUT:
@@ -1430,11 +1440,11 @@ parse_parameter_declaration(slang_parse_ctx * C, slang_output_ctx * O,
          param->type.qualifier = SLANG_QUAL_INOUT;
       else {
          slang_info_log_error(C->L, "Invalid type qualifier.");
-         return 0;
+         RETURN0;
       }
       break;
    default:
-      return 0;
+      RETURN0;
    }
 
    /* parse precision qualifier (lowp, mediump, highp */
@@ -1444,10 +1454,10 @@ parse_parameter_declaration(slang_parse_ctx * C, slang_output_ctx * O,
 
    /* parse parameter's type specifier and name */
    if (!parse_type_specifier(C, O, &param->type.specifier))
-      return 0;
+      RETURN0;
    param->a_name = parse_identifier(C);
    if (param->a_name == SLANG_ATOM_NULL)
-      return 0;
+      RETURN0;
 
    /* if the parameter is an array, parse its size (the size must be
     * explicitly defined
@@ -1564,13 +1574,13 @@ parse_operator_name(slang_parse_ctx * C)
             slang_atom_pool_atom(C->atoms, operator_names[i].o_name);
          if (atom == SLANG_ATOM_NULL) {
             slang_info_log_memory(C->L);
-            return 0;
+            RETURN0;
          }
          C->I++;
          return atom;
       }
    }
-   return 0;
+   RETURN0;
 }
 
 
@@ -1581,7 +1591,7 @@ parse_function_prototype(slang_parse_ctx * C, slang_output_ctx * O,
    GLuint functype;
    /* parse function type and name */
    if (!parse_fully_specified_type(C, O, &func->header.type))
-      return 0;
+      RETURN0;
 
    functype = *C->I++;
    switch (functype) {
@@ -1589,35 +1599,35 @@ parse_function_prototype(slang_parse_ctx * C, slang_output_ctx * O,
       func->kind = SLANG_FUNC_ORDINARY;
       func->header.a_name = parse_identifier(C);
       if (func->header.a_name == SLANG_ATOM_NULL)
-         return 0;
+         RETURN0;
       break;
    case FUNCTION_CONSTRUCTOR:
       func->kind = SLANG_FUNC_CONSTRUCTOR;
       if (func->header.type.specifier.type == SLANG_SPEC_STRUCT)
-         return 0;
+         RETURN0;
       func->header.a_name =
          slang_atom_pool_atom(C->atoms,
                               slang_type_specifier_type_to_string
                               (func->header.type.specifier.type));
       if (func->header.a_name == SLANG_ATOM_NULL) {
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       break;
    case FUNCTION_OPERATOR:
       func->kind = SLANG_FUNC_OPERATOR;
       func->header.a_name = parse_operator_name(C);
       if (func->header.a_name == SLANG_ATOM_NULL)
-         return 0;
+         RETURN0;
       break;
    default:
-      return 0;
+      RETURN0;
    }
 
    if (!legal_identifier(func->header.a_name)) {
       slang_info_log_error(C->L, "illegal function name '%s'",
                            (char *) func->header.a_name);
-      return 0;
+      RETURN0;
    }
 
    /* parse function parameters */
@@ -1625,10 +1635,10 @@ parse_function_prototype(slang_parse_ctx * C, slang_output_ctx * O,
       slang_variable *p = slang_variable_scope_grow(func->parameters);
       if (!p) {
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       if (!parse_parameter_declaration(C, O, p))
-         return 0;
+         RETURN0;
    }
 
    /* if the function returns a value, append a hidden __retVal 'out'
@@ -1662,19 +1672,19 @@ parse_function_definition(slang_parse_ctx * C, slang_output_ctx * O,
    slang_output_ctx o = *O;
 
    if (!parse_function_prototype(C, O, func))
-      return 0;
+      RETURN0;
 
    /* create function's body operation */
    func->body = (slang_operation *) _slang_alloc(sizeof(slang_operation));
    if (func->body == NULL) {
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
    if (!slang_operation_construct(func->body)) {
       _slang_free(func->body);
       func->body = NULL;
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
 
    /* to parse the body the parse context is modified in order to
@@ -1683,7 +1693,7 @@ parse_function_definition(slang_parse_ctx * C, slang_output_ctx * O,
    C->global_scope = GL_FALSE;
    o.vars = func->parameters;
    if (!parse_statement(C, &o, func->body))
-      return 0;
+      RETURN0;
 
    C->global_scope = GL_TRUE;
    return 1;
@@ -1779,46 +1789,46 @@ parse_init_declarator(slang_parse_ctx * C, slang_output_ctx * O,
       slang_info_log_error(C->L,
                    "declaration of '%s' conflicts with previous declaration",
                    (char *) a_name);
-      return 0;
+      RETURN0;
    }
 
    /* make room for the new variable and initialize it */
    var = slang_variable_scope_grow(O->vars);
    if (!var) {
       slang_info_log_memory(C->L);
-      return 0;
+      RETURN0;
    }
 
    /* copy the declarator qualifier type, parse the identifier */
    var->type.qualifier = type->qualifier;
    var->a_name = a_name;
    if (var->a_name == SLANG_ATOM_NULL)
-      return 0;
+      RETURN0;
 
    switch (*C->I++) {
    case VARIABLE_NONE:
       /* simple variable declarator - just copy the specifier */
       if (!slang_type_specifier_copy(&var->type.specifier, &type->specifier))
-         return 0;
+         RETURN0;
       break;
    case VARIABLE_INITIALIZER:
       /* initialized variable - copy the specifier and parse the expression */
       if (!slang_type_specifier_copy(&var->type.specifier, &type->specifier))
-         return 0;
+         RETURN0;
       var->initializer =
          (slang_operation *) _slang_alloc(sizeof(slang_operation));
       if (var->initializer == NULL) {
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       if (!slang_operation_construct(var->initializer)) {
          _slang_free(var->initializer);
          var->initializer = NULL;
          slang_info_log_memory(C->L);
-         return 0;
+         RETURN0;
       }
       if (!parse_expression(C, O, var->initializer))
-         return 0;
+         RETURN0;
       break;
    case VARIABLE_ARRAY_UNKNOWN:
       /* unsized array - mark it as array and copy the specifier to
@@ -1834,7 +1844,7 @@ parse_init_declarator(slang_parse_ctx * C, slang_output_ctx * O,
          return GL_FALSE;
       break;
    default:
-      return 0;
+      RETURN0;
    }
 
    /* allocate global address space for a variable with a known size */
@@ -1858,7 +1868,7 @@ parse_init_declarator(slang_parse_ctx * C, slang_output_ctx * O,
       A.log = C->L;
       A.curFuncEndLabel = NULL;
       if (!_slang_codegen_global_variable(&A, var, C->type))
-         return 0;
+         RETURN0;
    }
 
    /* initialize global variable */
@@ -1871,7 +1881,7 @@ parse_init_declarator(slang_parse_ctx * C, slang_output_ctx * O,
          A.space.structs = O->structs;
          A.space.vars = O->vars;
          if (!initialize_global(&A, var))
-            return 0;
+            RETURN0;
       }
    }
    return 1;
@@ -1888,17 +1898,17 @@ parse_init_declarator_list(slang_parse_ctx * C, slang_output_ctx * O)
 
    /* parse the fully specified type, common to all declarators */
    if (!slang_fully_specified_type_construct(&type))
-      return 0;
+      RETURN0;
    if (!parse_fully_specified_type(C, O, &type)) {
       slang_fully_specified_type_destruct(&type);
-      return 0;
+      RETURN0;
    }
 
    /* parse declarators, pass-in the parsed type */
    do {
       if (!parse_init_declarator(C, O, &type)) {
          slang_fully_specified_type_destruct(&type);
-         return 0;
+         RETURN0;
       }
    }
    while (*C->I++ == DECLARATOR_NEXT);
@@ -2005,18 +2015,18 @@ parse_declaration(slang_parse_ctx * C, slang_output_ctx * O)
    switch (*C->I++) {
    case DECLARATION_INIT_DECLARATOR_LIST:
       if (!parse_init_declarator_list(C, O))
-         return 0;
+         RETURN0;
       break;
    case DECLARATION_FUNCTION_PROTOTYPE:
       {
          slang_function *dummy_func;
 
          if (!parse_function(C, O, 0, &dummy_func))
-            return 0;
+            RETURN0;
       }
       break;
    default:
-      return 0;
+      RETURN0;
    }
    return 1;
 }
@@ -2028,7 +2038,7 @@ parse_default_precision(slang_parse_ctx * C, slang_output_ctx * O)
 
    if (!O->allow_precision) {
       slang_info_log_error(C->L, "syntax error at \"precision\"");
-      return 0;
+      RETURN0;
    }
 
    precision = *C->I++;
@@ -2041,7 +2051,7 @@ parse_default_precision(slang_parse_ctx * C, slang_output_ctx * O)
    default:
       _mesa_problem(NULL, "unexpected precision %d at %s:%d\n",
                     precision, __FILE__, __LINE__);
-      return 0;
+      RETURN0;
    }
 
    type = *C->I++;
@@ -2061,7 +2071,7 @@ parse_default_precision(slang_parse_ctx * C, slang_output_ctx * O)
    default:
       _mesa_problem(NULL, "unexpected type %d at %s:%d\n",
                     type, __FILE__, __LINE__);
-      return 0;
+      RETURN0;
    }
 
    assert(type < TYPE_SPECIFIER_COUNT);
@@ -2108,7 +2118,7 @@ parse_invariant(slang_parse_ctx * C, slang_output_ctx * O)
    }
    else {
       slang_info_log_error(C->L, "syntax error at \"invariant\"");
-      return 0;
+      RETURN0;
    }
 }