#include "glsl_types.h"
#include "ir.h"
-static ir_instruction *
+static unsigned
+process_parameters(exec_list *instructions, exec_list *actual_parameters,
+ exec_list *parameters,
+ struct _mesa_glsl_parse_state *state)
+{
+ unsigned count = 0;
+
+ foreach_list (n, parameters) {
+ ast_node *const ast = exec_node_data(ast_node, n, link);
+ ir_rvalue *const result = ast->hir(instructions, state);
+
+ actual_parameters->push_tail(result);
+ count++;
+ }
+
+ return count;
+}
+
+
+static ir_rvalue *
+process_call(exec_list *instructions, ir_function *f,
+ YYLTYPE *loc, exec_list *actual_parameters,
+ struct _mesa_glsl_parse_state *state)
+{
+ const ir_function_signature *sig =
+ f->matching_signature(actual_parameters);
+
+ /* The instructions param will be used when the FINISHMEs below are done */
+ (void) instructions;
+
+ 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.
+ */
+ exec_list_iterator actual_iter = actual_parameters->iterator();
+ exec_list_iterator formal_iter = sig->parameters.iterator();
+
+ while (actual_iter.has_next()) {
+ ir_rvalue *actual = (ir_rvalue *) actual_iter.get();
+ ir_variable *formal = (ir_variable *) formal_iter.get();
+
+ assert(actual != NULL);
+ assert(formal != NULL);
+
+ if ((formal->mode == ir_var_out)
+ || (formal->mode == ir_var_inout)) {
+ if (! actual->is_lvalue()) {
+ /* FINISHME: Log a better diagnostic here. There is no way
+ * FINISHME: to tell the user which parameter is invalid.
+ */
+ _mesa_glsl_error(loc, state, "`%s' parameter is not lvalue",
+ (formal->mode == ir_var_out) ? "out" : "inout");
+ }
+ }
+
+ actual_iter.next();
+ formal_iter.next();
+ }
+
+ /* FINISHME: The list of actual parameters needs to be modified to
+ * FINISHME: include any necessary conversions.
+ */
+ return new ir_call(sig, actual_parameters);
+ } else {
+ /* FINISHME: Log a better error message here. G++ will show the types
+ * FINISHME: of the actual parameters and the set of candidate
+ * FINISHME: functions. A different error should also be logged when
+ * FINISHME: multiple functions match.
+ */
+ _mesa_glsl_error(loc, state, "no matching function for call to `%s'",
+ f->name);
+ return ir_call::get_error_instruction();
+ }
+}
+
+
+static ir_rvalue *
match_function_by_name(exec_list *instructions, const char *name,
- YYLTYPE *loc, simple_node *parameters,
+ YYLTYPE *loc, exec_list *parameters,
struct _mesa_glsl_parse_state *state)
{
ir_function *f = state->symbols->get_function(name);
* process the parameters.
*/
exec_list actual_parameters;
- simple_node *const first = parameters;
- if (first != NULL) {
- simple_node *ptr = first;
- do {
- ir_instruction *const result =
- ((ast_node *) ptr)->hir(instructions, state);
- ptr = ptr->next;
-
- actual_parameters.push_tail(result);
- } while (ptr != first);
- }
+ process_parameters(instructions, &actual_parameters, parameters, state);
/* After processing the function's actual parameters, try to find an
* overload of the function that matches.
*/
- const ir_function_signature *sig =
- f->matching_signature(& actual_parameters);
- if (sig != NULL) {
- /* FINISHME: The list of actual parameters needs to be modified to
- * FINISHME: include any necessary conversions.
- */
- return new ir_call(sig, & actual_parameters);
+ return process_call(instructions, f, loc, &actual_parameters, state);
+}
+
+
+/**
+ * Perform automatic type conversion of constructor parameters
+ */
+static ir_rvalue *
+convert_component(ir_rvalue *src, const glsl_type *desired_type)
+{
+ const unsigned a = desired_type->base_type;
+ const unsigned b = src->type->base_type;
+
+ if (src->type->is_error())
+ return src;
+
+ assert(a <= GLSL_TYPE_BOOL);
+ assert(b <= GLSL_TYPE_BOOL);
+
+ if ((a == b) || (src->type->is_integer() && desired_type->is_integer()))
+ return src;
+
+ switch (a) {
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ if (b == GLSL_TYPE_FLOAT)
+ return new ir_expression(ir_unop_f2i, desired_type, src, NULL);
+ else {
+ assert(b == GLSL_TYPE_BOOL);
+ return new ir_expression(ir_unop_f2b, desired_type, src, NULL);
+ }
+ case GLSL_TYPE_FLOAT:
+ switch (b) {
+ case GLSL_TYPE_UINT:
+ return new ir_expression(ir_unop_u2f, desired_type, src, NULL);
+ case GLSL_TYPE_INT:
+ return new ir_expression(ir_unop_i2f, desired_type, src, NULL);
+ case GLSL_TYPE_BOOL:
+ return new ir_expression(ir_unop_b2f, desired_type, src, NULL);
+ }
+ break;
+ case GLSL_TYPE_BOOL: {
+ int z = 0;
+ ir_constant *const zero = new ir_constant(src->type, &z);
+
+ return new ir_expression(ir_binop_nequal, desired_type, src, zero);
+ }
+ }
+
+ assert(!"Should not get here.");
+ return NULL;
+}
+
+
+/**
+ * Dereference a specific component from a scalar, vector, or matrix
+ */
+static ir_rvalue *
+dereference_component(ir_rvalue *src, unsigned component)
+{
+ assert(component < src->type->components());
+
+ if (src->type->is_scalar()) {
+ return src;
+ } else if (src->type->is_vector()) {
+ return new ir_swizzle(src, component, 0, 0, 0, 1);
} else {
- /* FINISHME: Log a better error message here. G++ will show the types
- * FINISHME: of the actual parameters and the set of candidate
- * FINISHME: functions. A different error should also be logged when
- * FINISHME: multiple functions match.
+ assert(src->type->is_matrix());
+
+ /* Dereference a row of the matrix, then call this function again to get
+ * a specific element from that row.
*/
- _mesa_glsl_error(loc, state, "no matching function for call to `%s'",
- name);
+ const int c = component / src->type->column_type()->vector_elements;
+ const int r = component % src->type->column_type()->vector_elements;
+ ir_constant *const col_index = new ir_constant(glsl_type::int_type, &c);
+ ir_dereference *const col = new ir_dereference(src, col_index);
+
+ col->type = src->type->column_type();
+
+ return dereference_component(col, r);
+ }
+
+ assert(!"Should not get here.");
+ return NULL;
+}
+
+
+static ir_rvalue *
+process_array_constructor(exec_list *instructions,
+ const glsl_type *constructor_type,
+ YYLTYPE *loc, exec_list *parameters,
+ struct _mesa_glsl_parse_state *state)
+{
+ /* Array constructors come in two forms: sized and unsized. Sized array
+ * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
+ * variables. In this case the number of parameters must exactly match the
+ * specified size of the array.
+ *
+ * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
+ * are vec4 variables. In this case the size of the array being constructed
+ * is determined by the number of parameters.
+ *
+ * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "There must be exactly the same number of arguments as the size of
+ * the array being constructed. If no size is present in the
+ * constructor, then the array is explicitly sized to the number of
+ * arguments provided. The arguments are assigned in order, starting at
+ * element 0, to the elements of the constructed array. Each argument
+ * must be the same type as the element type of the array, or be a type
+ * that can be converted to the element type of the array according to
+ * Section 4.1.10 "Implicit Conversions.""
+ */
+ exec_list actual_parameters;
+ const unsigned parameter_count =
+ process_parameters(instructions, &actual_parameters, parameters, state);
+
+ if ((parameter_count == 0)
+ || ((constructor_type->length != 0)
+ && (constructor_type->length != parameter_count))) {
+ const unsigned min_param = (constructor_type->length == 0)
+ ? 1 : constructor_type->length;
+
+ _mesa_glsl_error(loc, state, "array constructor must have %s %u "
+ "parameter%s",
+ (constructor_type->length != 0) ? "at least" : "exactly",
+ min_param, (min_param <= 1) ? "" : "s");
return ir_call::get_error_instruction();
}
+
+ if (constructor_type->length == 0) {
+ constructor_type =
+ glsl_type::get_array_instance(constructor_type->element_type(),
+ parameter_count);
+ assert(constructor_type != NULL);
+ assert(constructor_type->length == parameter_count);
+ }
+
+ ir_function *f = state->symbols->get_function(constructor_type->name);
+
+ /* If the constructor for this type of array does not exist, generate the
+ * prototype and add it to the symbol table.
+ */
+ if (f == NULL) {
+ f = constructor_type->generate_constructor(state->symbols);
+ }
+
+ ir_rvalue *const r =
+ process_call(instructions, f, loc, &actual_parameters, state);
+
+ assert(r != NULL);
+ assert(r->type->is_error() || (r->type == constructor_type));
+
+ return r;
}
-ir_instruction *
+ir_rvalue *
ast_function_expression::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
if (is_constructor()) {
const ast_type_specifier *type = (ast_type_specifier *) subexpressions[0];
YYLTYPE loc = type->get_location();
+ const char *name;
- const glsl_type *const constructor_type =
- state->symbols->get_type(type->type_name);
+ const glsl_type *const constructor_type = type->glsl_type(& name, state);
/* Constructors for samplers are illegal.
return ir_call::get_error_instruction();
}
+ if (constructor_type->is_array()) {
+ if (state->language_version <= 110) {
+ _mesa_glsl_error(& loc, state,
+ "array constructors forbidden in GLSL 1.10");
+ return ir_call::get_error_instruction();
+ }
+
+ return process_array_constructor(instructions, constructor_type,
+ & loc, &this->expressions, state);
+ }
/* There are two kinds of constructor call. Constructors for built-in
* language types, such as mat4 and vec2, are free form. The only
* correct order. These constructors follow essentially the same type
* matching rules as functions.
*/
+ if (constructor_type->is_numeric() || constructor_type->is_boolean()) {
+ /* Constructing a numeric type has a couple steps. First all values
+ * passed to the constructor are broken into individual parameters
+ * and type converted to the base type of the thing being constructed.
+ *
+ * At that point we have some number of values that match the base
+ * type of the thing being constructed. Now the constructor can be
+ * treated like a function call. Each numeric type has a small set
+ * of constructor functions. The set of new parameters will either
+ * match one of those functions or the original constructor is
+ * invalid.
+ */
+ const glsl_type *const base_type = constructor_type->get_base_type();
+
+ /* Total number of components of the type being constructed.
+ */
+ const unsigned type_components = constructor_type->components();
+
+ /* Number of components from parameters that have actually been
+ * consumed. This is used to perform several kinds of error checking.
+ */
+ unsigned components_used = 0;
+
+ unsigned matrix_parameters = 0;
+ unsigned nonmatrix_parameters = 0;
+ exec_list actual_parameters;
+
+ assert(!this->expressions.is_empty());
+
+ foreach_list (n, &this->expressions) {
+ ast_node *ast = exec_node_data(ast_node, n, link);
+ ir_rvalue *const result =
+ ast->hir(instructions, state)->as_rvalue();
+
+ /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "It is an error to provide extra arguments beyond this
+ * last used argument."
+ */
+ if (components_used >= type_components) {
+ _mesa_glsl_error(& loc, state, "too many parameters to `%s' "
+ "constructor",
+ constructor_type->name);
+ return ir_call::get_error_instruction();
+ }
+
+ if (!result->type->is_numeric() && !result->type->is_boolean()) {
+ _mesa_glsl_error(& loc, state, "cannot construct `%s' from a "
+ "non-numeric data type",
+ constructor_type->name);
+ return ir_call::get_error_instruction();
+ }
+
+ /* Count the number of matrix and nonmatrix parameters. This
+ * is used below to enforce some of the constructor rules.
+ */
+ if (result->type->is_matrix())
+ matrix_parameters++;
+ else
+ nonmatrix_parameters++;
+
+
+ /* Process each of the components of the parameter. Dereference
+ * each component individually, perform any type conversions, and
+ * add it to the parameter list for the constructor.
+ */
+ for (unsigned i = 0; i < result->type->components(); i++) {
+ if (components_used >= type_components)
+ break;
+
+ ir_rvalue *const component =
+ convert_component(dereference_component(result, i),
+ base_type);
+
+ /* All cases that could result in component->type being the
+ * error type should have already been caught above.
+ */
+ assert(component->type == base_type);
+
+ /* Don't actually generate constructor calls for scalars.
+ * Instead, do the usual component selection and conversion,
+ * and return the single component.
+ */
+ if (constructor_type->is_scalar())
+ return component;
+
+ actual_parameters.push_tail(component);
+ components_used++;
+ }
+ }
+
+ /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "It is an error to construct matrices from other matrices. This
+ * is reserved for future use."
+ */
+ if ((state->language_version <= 110) && (matrix_parameters > 0)
+ && constructor_type->is_matrix()) {
+ _mesa_glsl_error(& loc, state, "cannot construct `%s' from a "
+ "matrix in GLSL 1.10",
+ constructor_type->name);
+ return ir_call::get_error_instruction();
+ }
+
+ /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "If a matrix argument is given to a matrix constructor, it is
+ * an error to have any other arguments."
+ */
+ if ((matrix_parameters > 0)
+ && ((matrix_parameters + nonmatrix_parameters) > 1)
+ && constructor_type->is_matrix()) {
+ _mesa_glsl_error(& loc, state, "for matrix `%s' constructor, "
+ "matrix must be only parameter",
+ constructor_type->name);
+ return ir_call::get_error_instruction();
+ }
+
+ /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "In these cases, there must be enough components provided in the
+ * arguments to provide an initializer for every component in the
+ * constructed value."
+ */
+ if ((components_used < type_components) && (components_used != 1)) {
+ _mesa_glsl_error(& loc, state, "too few components to construct "
+ "`%s'",
+ constructor_type->name);
+ return ir_call::get_error_instruction();
+ }
+
+ ir_function *f = state->symbols->get_function(constructor_type->name);
+ if (f == NULL) {
+ _mesa_glsl_error(& loc, state, "no constructor for type `%s'",
+ constructor_type->name);
+ return ir_call::get_error_instruction();
+ }
+
+ const ir_function_signature *sig =
+ f->matching_signature(& actual_parameters);
+ if (sig != NULL) {
+ return new ir_call(sig, & actual_parameters);
+ } else {
+ /* FINISHME: Log a better error message here. G++ will show the
+ * FINSIHME: types of the actual parameters and the set of
+ * FINSIHME: candidate functions. A different error should also be
+ * FINSIHME: logged when multiple functions match.
+ */
+ _mesa_glsl_error(& loc, state, "no matching constructor for `%s'",
+ constructor_type->name);
+ return ir_call::get_error_instruction();
+ }
+ }
return ir_call::get_error_instruction();
} else {
return match_function_by_name(instructions,
id->primary_expression.identifier, & loc,
- subexpressions[1], state);
+ &this->expressions, state);
}
return ir_call::get_error_instruction();
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