*
* \param return_type Return type of the function. May be \c NULL.
* \param name Name of the function.
- * \param parameters Parameter list for the function. This may be either a
- * formal or actual parameter list. Only the type is used.
+ * \param parameters List of \c ir_instruction nodes representing the
+ * parameter list for the function. This may be either a
+ * formal (\c ir_variable) or actual (\c ir_rvalue)
+ * parameter list. Only the type is used.
*
* \return
* A ralloced string representing the prototype of the function.
if (f == NULL) {
f = new(ctx) ir_function(name);
state->symbols->add_global_function(f);
- emit_function(state, instructions, f);
+ emit_function(state, f);
}
f->add_signature(sig->clone_prototype(f, NULL));
}
}
+ exec_list post_call_conversions;
+
if (sig != NULL) {
/* Verify that 'out' and 'inout' actual parameters are lvalues. This
* isn't done in ir_function::matching_signature because that function
*
* Also, validate that 'const_in' formal parameters (an extension of our
* IR) correspond to ir_constant actual parameters.
+ *
+ * Also, perform implicit conversion of arguments. Note: to implicitly
+ * convert out parameters, we need to place them in a temporary
+ * variable, and do the conversion after the call takes place. Since we
+ * haven't emitted the call yet, we'll place the post-call conversions
+ * in a temporary exec_list, and emit them later.
*/
exec_list_iterator actual_iter = actual_parameters->iterator();
exec_list_iterator formal_iter = sig->parameters.iterator();
_mesa_glsl_error(loc, state,
"parameter `%s' must be a constant expression",
formal->name);
+ return ir_call::get_error_instruction(ctx);
}
if ((formal->mode == ir_var_out)
}
if (formal->type->is_numeric() || formal->type->is_boolean()) {
- ir_rvalue *converted = convert_component(actual, formal->type);
- actual->replace_with(converted);
+ switch (formal->mode) {
+ case ir_var_const_in:
+ case ir_var_in: {
+ ir_rvalue *converted
+ = convert_component(actual, formal->type);
+ actual->replace_with(converted);
+ break;
+ }
+ case ir_var_out:
+ if (actual->type != formal->type) {
+ /* To convert an out parameter, we need to create a
+ * temporary variable to hold the value before conversion,
+ * and then perform the conversion after the function call
+ * returns.
+ *
+ * This has the effect of transforming code like this:
+ *
+ * void f(out int x);
+ * float value;
+ * f(value);
+ *
+ * Into IR that's equivalent to this:
+ *
+ * void f(out int x);
+ * float value;
+ * int out_parameter_conversion;
+ * f(out_parameter_conversion);
+ * value = float(out_parameter_conversion);
+ */
+ ir_variable *tmp =
+ new(ctx) ir_variable(formal->type,
+ "out_parameter_conversion",
+ ir_var_temporary);
+ instructions->push_tail(tmp);
+ ir_dereference_variable *deref_tmp_1
+ = new(ctx) ir_dereference_variable(tmp);
+ ir_dereference_variable *deref_tmp_2
+ = new(ctx) ir_dereference_variable(tmp);
+ ir_rvalue *converted_tmp
+ = convert_component(deref_tmp_1, actual->type);
+ ir_assignment *assignment
+ = new(ctx) ir_assignment(actual, converted_tmp);
+ post_call_conversions.push_tail(assignment);
+ actual->replace_with(deref_tmp_2);
+ }
+ break;
+ case ir_var_inout:
+ /* Inout parameters should never require conversion, since that
+ * would require an implicit conversion to exist both to and
+ * from the formal parameter type, and there are no
+ * bidirectional implicit conversions.
+ */
+ assert (actual->type == formal->type);
+ break;
+ default:
+ assert (!"Illegal formal parameter mode");
+ break;
+ }
}
actual_iter.next();
/* Always insert the call in the instruction stream, and return a deref
* of its return val if it returns a value, since we don't know if
* the rvalue is going to be assigned to anything or not.
+ *
+ * Also insert any out parameter conversions after the call.
*/
ir_call *call = new(ctx) ir_call(sig, actual_parameters);
+ ir_dereference_variable *deref;
if (!sig->return_type->is_void()) {
+ /* If the function call is a constant expression, don't
+ * generate the instructions to call it; just generate an
+ * ir_constant representing the constant value.
+ *
+ * Function calls can only be constant expressions starting
+ * in GLSL 1.20.
+ */
+ if (state->language_version >= 120) {
+ ir_constant *const_val = call->constant_expression_value();
+ if (const_val) {
+ return const_val;
+ }
+ }
+
ir_variable *var;
- ir_dereference_variable *deref;
var = new(ctx) ir_variable(sig->return_type,
ralloc_asprintf(ctx, "%s_retval",
deref = new(ctx) ir_dereference_variable(var);
ir_assignment *assign = new(ctx) ir_assignment(deref, call, NULL);
instructions->push_tail(assign);
- if (state->language_version >= 120)
- var->constant_value = call->constant_expression_value();
deref = new(ctx) ir_dereference_variable(var);
- return deref;
} else {
instructions->push_tail(call);
- return NULL;
+ deref = NULL;
}
+ instructions->append_list(&post_call_conversions);
+ return deref;
} else {
char *str = prototype_string(NULL, name, actual_parameters);
ir_rvalue *ir = (ir_rvalue *) n;
ir_rvalue *result = ir;
- /* Apply implicit conversions (not the scalar constructor rules!) */
+ /* Apply implicit conversions (not the scalar constructor rules!). See
+ * the spec quote above. */
if (constructor_type->element_type()->is_float()) {
const glsl_type *desired_type =
glsl_type::get_instance(GLSL_TYPE_FLOAT,
ir->type->vector_elements,
ir->type->matrix_columns);
- result = convert_component(ir, desired_type);
+ if (result->type->can_implicitly_convert_to(desired_type)) {
+ /* Even though convert_component() implements the constructor
+ * conversion rules (not the implicit conversion rules), its safe
+ * to use it here because we already checked that the implicit
+ * conversion is legal.
+ */
+ result = convert_component(ir, desired_type);
+ }
}
if (result->type != constructor_type->element_type()) {
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