*
* \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 talloced string representing the prototype of the function.
+ * A ralloced string representing the prototype of the function.
*/
char *
prototype_string(const glsl_type *return_type, const char *name,
char *str = NULL;
if (return_type != NULL)
- str = talloc_asprintf(str, "%s ", return_type->name);
+ str = ralloc_asprintf(NULL, "%s ", return_type->name);
- str = talloc_asprintf_append(str, "%s(", name);
+ ralloc_asprintf_append(&str, "%s(", name);
const char *comma = "";
foreach_list(node, parameters) {
const ir_instruction *const param = (ir_instruction *) node;
- str = talloc_asprintf_append(str, "%s%s", comma, param->type->name);
+ ralloc_asprintf_append(&str, "%s%s", comma, param->type->name);
comma = ", ";
}
- str = talloc_strdup_append(str, ")");
+ ralloc_strcat(&str, ")");
return str;
}
* FINISHME: matching signature but shader X + N contains an _exact_
* FINISHME: matching signature.
*/
- if (sig == NULL && (f == NULL || state->es_shader || !f->has_user_signature()) && state->symbols->get_type(name) == NULL && (state->language_version == 110 || state->symbols->get_variable(name) == NULL)) {
+ if (sig == NULL
+ && (f == NULL || state->es_shader || !f->has_user_signature())
+ && state->symbols->get_type(name) == NULL
+ && (state->language_version == 110
+ || state->symbols->get_variable(name) == NULL)) {
/* The current shader doesn't contain a matching function or signature.
* Before giving up, look for the prototype in the built-in functions.
*/
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
* cannot generate the necessary diagnostics.
+ *
+ * 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();
assert(actual != NULL);
assert(formal != NULL);
+ if (formal->mode == ir_var_const_in && !actual->as_constant()) {
+ _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)
|| (formal->mode == ir_var_inout)) {
const char *mode = NULL;
}
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,
- talloc_asprintf(ctx, "%s_retval",
+ ralloc_asprintf(ctx, "%s_retval",
sig->function_name()),
ir_var_temporary);
instructions->push_tail(var);
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);
_mesa_glsl_error(loc, state, "no matching function for call to `%s'",
str);
- talloc_free(str);
+ ralloc_free(str);
const char *prefix = "candidates are: ";
- for (int i = -1; i < state->num_builtins_to_link; i++) {
+ for (int i = -1; i < (int) state->num_builtins_to_link; i++) {
glsl_symbol_table *syms = i >= 0 ? state->builtins_to_link[i]->symbols
: state->symbols;
f = syms->get_function(name);
ir_function_signature *sig = (ir_function_signature *) node;
str = prototype_string(sig->return_type, f->name, &sig->parameters);
- _mesa_glsl_error(loc, state, "%s%s\n", prefix, str);
- talloc_free(str);
+ _mesa_glsl_error(loc, state, "%s%s", prefix, str);
+ ralloc_free(str);
prefix = " ";
}
static ir_rvalue *
convert_component(ir_rvalue *src, const glsl_type *desired_type)
{
- void *ctx = talloc_parent(src);
+ void *ctx = ralloc_parent(src);
const unsigned a = desired_type->base_type;
const unsigned b = src->type->base_type;
ir_expression *result = NULL;
assert(a <= GLSL_TYPE_BOOL);
assert(b <= GLSL_TYPE_BOOL);
- if ((a == b) || (src->type->is_integer() && desired_type->is_integer()))
+ if (a == b)
return src;
switch (a) {
case GLSL_TYPE_UINT:
+ switch (b) {
+ case GLSL_TYPE_INT:
+ result = new(ctx) ir_expression(ir_unop_i2u, src);
+ break;
+ case GLSL_TYPE_FLOAT:
+ result = new(ctx) ir_expression(ir_unop_i2u,
+ new(ctx) ir_expression(ir_unop_f2i, src));
+ break;
+ case GLSL_TYPE_BOOL:
+ result = new(ctx) ir_expression(ir_unop_i2u,
+ new(ctx) ir_expression(ir_unop_b2i, src));
+ break;
+ }
+ break;
case GLSL_TYPE_INT:
- if (b == GLSL_TYPE_FLOAT)
- result = new(ctx) ir_expression(ir_unop_f2i, desired_type, src, NULL);
- else {
- assert(b == GLSL_TYPE_BOOL);
- result = new(ctx) ir_expression(ir_unop_b2i, desired_type, src, NULL);
+ switch (b) {
+ case GLSL_TYPE_UINT:
+ result = new(ctx) ir_expression(ir_unop_u2i, src);
+ break;
+ case GLSL_TYPE_FLOAT:
+ result = new(ctx) ir_expression(ir_unop_f2i, src);
+ break;
+ case GLSL_TYPE_BOOL:
+ result = new(ctx) ir_expression(ir_unop_b2i, src);
+ break;
}
break;
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
switch (b) {
case GLSL_TYPE_UINT:
+ result = new(ctx) ir_expression(ir_unop_i2b,
+ new(ctx) ir_expression(ir_unop_u2i, src));
+ break;
case GLSL_TYPE_INT:
result = new(ctx) ir_expression(ir_unop_i2b, desired_type, src, NULL);
break;
}
assert(result != NULL);
+ assert(result->type == desired_type);
/* Try constant folding; it may fold in the conversion we just added. */
ir_constant *const constant = result->constant_expression_value();
static ir_rvalue *
dereference_component(ir_rvalue *src, unsigned component)
{
- void *ctx = talloc_parent(src);
+ void *ctx = ralloc_parent(src);
assert(component < src->type->components());
/* If the source is a constant, just create a new constant instead of a
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()) {
const glsl_type *const constructor_type = type->glsl_type(& name, state);
+ /* constructor_type can be NULL if a variable with the same name as the
+ * structure has come into scope.
+ */
+ if (constructor_type == NULL) {
+ _mesa_glsl_error(& loc, state, "unknown type `%s' (structure name "
+ "may be shadowed by a variable with the same name)",
+ type->type_name);
+ return ir_call::get_error_instruction(ctx);
+ }
+
/* Constructors for samplers are illegal.
*/
* correct order. These constructors follow essentially the same type
* matching rules as functions.
*/
+ if (constructor_type->is_record()) {
+ exec_list actual_parameters;
+
+ process_parameters(instructions, &actual_parameters,
+ &this->expressions, state);
+
+ exec_node *node = actual_parameters.head;
+ for (unsigned i = 0; i < constructor_type->length; i++) {
+ ir_rvalue *ir = (ir_rvalue *) node;
+
+ if (node->is_tail_sentinel()) {
+ _mesa_glsl_error(&loc, state,
+ "insufficient parameters to constructor "
+ "for `%s'",
+ constructor_type->name);
+ return ir_call::get_error_instruction(ctx);
+ }
+
+ if (apply_implicit_conversion(constructor_type->fields.structure[i].type,
+ ir, state)) {
+ node->replace_with(ir);
+ } else {
+ _mesa_glsl_error(&loc, state,
+ "parameter type mismatch in constructor "
+ "for `%s.%s' (%s vs %s)",
+ constructor_type->name,
+ constructor_type->fields.structure[i].name,
+ ir->type->name,
+ constructor_type->fields.structure[i].type->name);
+ return ir_call::get_error_instruction(ctx);;
+ }
+
+ node = node->next;
+ }
+
+ if (!node->is_tail_sentinel()) {
+ _mesa_glsl_error(&loc, state, "too many parameters in constructor "
+ "for `%s'", constructor_type->name);
+ return ir_call::get_error_instruction(ctx);
+ }
+
+ ir_rvalue *const constant =
+ constant_record_constructor(constructor_type, &actual_parameters,
+ state);
+
+ return (constant != NULL)
+ ? constant
+ : emit_inline_record_constructor(constructor_type, instructions,
+ &actual_parameters, state);
+ }
+
if (!constructor_type->is_numeric() && !constructor_type->is_boolean())
return ir_call::get_error_instruction(ctx);
process_parameters(instructions, &actual_parameters, &this->expressions,
state);
- const glsl_type *const type =
- state->symbols->get_type(id->primary_expression.identifier);
-
- if ((type != NULL) && type->is_record()) {
- exec_node *node = actual_parameters.head;
- for (unsigned i = 0; i < type->length; i++) {
- ir_rvalue *ir = (ir_rvalue *) node;
-
- if (node->is_tail_sentinel()) {
- _mesa_glsl_error(&loc, state,
- "insufficient parameters to constructor "
- "for `%s'",
- type->name);
- return ir_call::get_error_instruction(ctx);
- }
-
- if (apply_implicit_conversion(type->fields.structure[i].type, ir,
- state)) {
- node->replace_with(ir);
- } else {
- _mesa_glsl_error(&loc, state,
- "parameter type mismatch in constructor "
- "for `%s.%s' (%s vs %s)",
- type->name,
- type->fields.structure[i].name,
- ir->type->name,
- type->fields.structure[i].type->name);
- return ir_call::get_error_instruction(ctx);;
- }
-
- node = node->next;
- }
-
- if (!node->is_tail_sentinel()) {
- _mesa_glsl_error(&loc, state, "too many parameters in constructor "
- "for `%s'", type->name);
- return ir_call::get_error_instruction(ctx);
- }
-
- ir_rvalue *const constant =
- constant_record_constructor(type, &actual_parameters, state);
-
- return (constant != NULL)
- ? constant
- : emit_inline_record_constructor(type, instructions,
- &actual_parameters, state);
- }
-
return match_function_by_name(instructions,
id->primary_expression.identifier, & loc,
&actual_parameters, state);
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