xserver and mesa git update 28-12-2010

1 files changed, 1254 insertions, 1241 deletions

diff --git a/mesalib/src/glsl/ast_function.cpp b/mesalib/src/glsl/ast_function.cpp
index 20448f5a9..2e1a4d9f6 100644
--- a/mesalib/src/glsl/ast_function.cpp
+++ b/mesalib/src/glsl/ast_function.cpp
@@ -1,1241 +1,1254 @@
-/*
- * Copyright © 2010 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-
-#include "glsl_symbol_table.h"
-#include "ast.h"
-#include "glsl_types.h"
-#include "ir.h"
-#include "main/core.h" /* for MIN2 */
-
-static ir_rvalue *
-convert_component(ir_rvalue *src, const glsl_type *desired_type);
-
-bool
-apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
-                          struct _mesa_glsl_parse_state *state);
-
-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 *result = ast->hir(instructions, state);
-
-      ir_constant *const constant = result->constant_expression_value();
-      if (constant != NULL)
-	 result = constant;
-
-      actual_parameters->push_tail(result);
-      count++;
-   }
-
-   return count;
-}
-
-
-/**
- * Generate a source prototype for a function signature
- *
- * \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.
- *
- * \return
- * A talloced string representing the prototype of the function.
- */
-char *
-prototype_string(const glsl_type *return_type, const char *name,
-		 exec_list *parameters)
-{
-   char *str = NULL;
-
-   if (return_type != NULL)
-      str = talloc_asprintf(str, "%s ", return_type->name);
-
-   str = talloc_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);
-      comma = ", ";
-   }
-
-   str = talloc_strdup_append(str, ")");
-   return str;
-}
-
-
-static ir_rvalue *
-process_call(exec_list *instructions, ir_function *f,
-	     YYLTYPE *loc, exec_list *actual_parameters,
-	     struct _mesa_glsl_parse_state *state)
-{
-   void *ctx = state;
-
-   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");
-	    }
-	 }
-
-	 if (formal->type->is_numeric() || formal->type->is_boolean()) {
-	    ir_rvalue *converted = convert_component(actual, formal->type);
-	    actual->replace_with(converted);
-	 }
-
-	 actual_iter.next();
-	 formal_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.
-       */
-      ir_call *call = new(ctx) ir_call(sig, actual_parameters);
-      if (!sig->return_type->is_void()) {
-	 ir_variable *var;
-	 ir_dereference_variable *deref;
-
-	 var = new(ctx) ir_variable(sig->return_type,
-				    talloc_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;
-      }
-   } else {
-      char *str = prototype_string(NULL, f->name, actual_parameters);
-
-      _mesa_glsl_error(loc, state, "no matching function for call to `%s'",
-		       str);
-      talloc_free(str);
-
-      const char *prefix = "candidates are: ";
-      foreach_list (node, &f->signatures) {
-	 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);
-
-	 prefix = "                ";
-      }
-
-      return ir_call::get_error_instruction(ctx);
-   }
-}
-
-
-static ir_rvalue *
-match_function_by_name(exec_list *instructions, const char *name,
-		       YYLTYPE *loc, exec_list *actual_parameters,
-		       struct _mesa_glsl_parse_state *state)
-{
-   void *ctx = state;
-   ir_function *f = state->symbols->get_function(name);
-
-   if (f == NULL) {
-      _mesa_glsl_error(loc, state, "function `%s' undeclared", name);
-      return ir_call::get_error_instruction(ctx);
-   }
-
-   /* Once we've determined that the function being called might exist, try
-    * to find an overload of the function that matches the parameters.
-    */
-   return process_call(instructions, f, loc, actual_parameters, state);
-}
-
-
-/**
- * Perform automatic type conversion of constructor parameters
- *
- * This implements the rules in the "Conversion and Scalar Constructors"
- * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
- */
-static ir_rvalue *
-convert_component(ir_rvalue *src, const glsl_type *desired_type)
-{
-   void *ctx = talloc_parent(src);
-   const unsigned a = desired_type->base_type;
-   const unsigned b = src->type->base_type;
-   ir_expression *result = NULL;
-
-   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)
-	 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);
-      }
-      break;
-   case GLSL_TYPE_FLOAT:
-      switch (b) {
-      case GLSL_TYPE_UINT:
-	 result = new(ctx) ir_expression(ir_unop_u2f, desired_type, src, NULL);
-	 break;
-      case GLSL_TYPE_INT:
-	 result = new(ctx) ir_expression(ir_unop_i2f, desired_type, src, NULL);
-	 break;
-      case GLSL_TYPE_BOOL:
-	 result = new(ctx) ir_expression(ir_unop_b2f, desired_type, src, NULL);
-	 break;
-      }
-      break;
-   case GLSL_TYPE_BOOL:
-      switch (b) {
-      case GLSL_TYPE_UINT:
-      case GLSL_TYPE_INT:
-	 result = new(ctx) ir_expression(ir_unop_i2b, desired_type, src, NULL);
-	 break;
-      case GLSL_TYPE_FLOAT:
-	 result = new(ctx) ir_expression(ir_unop_f2b, desired_type, src, NULL);
-	 break;
-      }
-      break;
-   }
-
-   assert(result != NULL);
-
-   /* Try constant folding; it may fold in the conversion we just added. */
-   ir_constant *const constant = result->constant_expression_value();
-   return (constant != NULL) ? (ir_rvalue *) constant : (ir_rvalue *) result;
-}
-
-/**
- * Dereference a specific component from a scalar, vector, or matrix
- */
-static ir_rvalue *
-dereference_component(ir_rvalue *src, unsigned component)
-{
-   void *ctx = talloc_parent(src);
-   assert(component < src->type->components());
-
-   /* If the source is a constant, just create a new constant instead of a
-    * dereference of the existing constant.
-    */
-   ir_constant *constant = src->as_constant();
-   if (constant)
-      return new(ctx) ir_constant(constant, component);
-
-   if (src->type->is_scalar()) {
-      return src;
-   } else if (src->type->is_vector()) {
-      return new(ctx) ir_swizzle(src, component, 0, 0, 0, 1);
-   } else {
-      assert(src->type->is_matrix());
-
-      /* Dereference a row of the matrix, then call this function again to get
-       * a specific element from that row.
-       */
-      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(ctx) ir_constant(c);
-      ir_dereference *const col = new(ctx) ir_dereference_array(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)
-{
-   void *ctx = 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(ctx);
-   }
-
-   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);
-   }
-
-   bool all_parameters_are_constant = true;
-
-   /* Type cast each parameter and, if possible, fold constants. */
-   foreach_list_safe(n, &actual_parameters) {
-      ir_rvalue *ir = (ir_rvalue *) n;
-      ir_rvalue *result = ir;
-
-      /* Apply implicit conversions (not the scalar constructor rules!) */
-      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 != constructor_type->element_type()) {
-	 _mesa_glsl_error(loc, state, "type error in array constructor: "
-			  "expected: %s, found %s",
-			  constructor_type->element_type()->name,
-			  result->type->name);
-      }
-
-      /* Attempt to convert the parameter to a constant valued expression.
-       * After doing so, track whether or not all the parameters to the
-       * constructor are trivially constant valued expressions.
-       */
-      ir_rvalue *const constant = result->constant_expression_value();
-
-      if (constant != NULL)
-         result = constant;
-      else
-         all_parameters_are_constant = false;
-
-      ir->replace_with(result);
-   }
-
-   if (all_parameters_are_constant)
-      return new(ctx) ir_constant(constructor_type, &actual_parameters);
-
-   ir_variable *var = new(ctx) ir_variable(constructor_type, "array_ctor",
-					   ir_var_temporary);
-   instructions->push_tail(var);
-
-   int i = 0;
-   foreach_list(node, &actual_parameters) {
-      ir_rvalue *rhs = (ir_rvalue *) node;
-      ir_rvalue *lhs = new(ctx) ir_dereference_array(var,
-						     new(ctx) ir_constant(i));
-
-      ir_instruction *assignment = new(ctx) ir_assignment(lhs, rhs, NULL);
-      instructions->push_tail(assignment);
-
-      i++;
-   }
-
-   return new(ctx) ir_dereference_variable(var);
-}
-
-
-/**
- * Try to convert a record constructor to a constant expression
- */
-static ir_constant *
-constant_record_constructor(const glsl_type *constructor_type,
-			    exec_list *parameters, void *mem_ctx)
-{
-   foreach_list(node, parameters) {
-      ir_constant *constant = ((ir_instruction *) node)->as_constant();
-      if (constant == NULL)
-	 return NULL;
-      node->replace_with(constant);
-   }
-
-   return new(mem_ctx) ir_constant(constructor_type, parameters);
-}
-
-
-/**
- * Determine if a list consists of a single scalar r-value
- */
-bool
-single_scalar_parameter(exec_list *parameters)
-{
-   const ir_rvalue *const p = (ir_rvalue *) parameters->head;
-   assert(((ir_rvalue *)p)->as_rvalue() != NULL);
-
-   return (p->type->is_scalar() && p->next->is_tail_sentinel());
-}
-
-
-/**
- * Generate inline code for a vector constructor
- *
- * The generated constructor code will consist of a temporary variable
- * declaration of the same type as the constructor.  A sequence of assignments
- * from constructor parameters to the temporary will follow.
- *
- * \return
- * An \c ir_dereference_variable of the temprorary generated in the constructor
- * body.
- */
-ir_rvalue *
-emit_inline_vector_constructor(const glsl_type *type,
-			       exec_list *instructions,
-			       exec_list *parameters,
-			       void *ctx)
-{
-   assert(!parameters->is_empty());
-
-   ir_variable *var = new(ctx) ir_variable(type, "vec_ctor", ir_var_temporary);
-   instructions->push_tail(var);
-
-   /* There are two kinds of vector constructors.
-    *
-    *  - Construct a vector from a single scalar by replicating that scalar to
-    *    all components of the vector.
-    *
-    *  - Construct a vector from an arbirary combination of vectors and
-    *    scalars.  The components of the constructor parameters are assigned
-    *    to the vector in order until the vector is full.
-    */
-   const unsigned lhs_components = type->components();
-   if (single_scalar_parameter(parameters)) {
-      ir_rvalue *first_param = (ir_rvalue *)parameters->head;
-      ir_rvalue *rhs = new(ctx) ir_swizzle(first_param, 0, 0, 0, 0,
-					   lhs_components);
-      ir_dereference_variable *lhs = new(ctx) ir_dereference_variable(var);
-      const unsigned mask = (1U << lhs_components) - 1;
-
-      assert(rhs->type == lhs->type);
-
-      ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL, mask);
-      instructions->push_tail(inst);
-   } else {
-      unsigned base_component = 0;
-      unsigned base_lhs_component = 0;
-      ir_constant_data data;
-      unsigned constant_mask = 0, constant_components = 0;
-
-      memset(&data, 0, sizeof(data));
-
-      foreach_list(node, parameters) {
-	 ir_rvalue *param = (ir_rvalue *) node;
-	 unsigned rhs_components = param->type->components();
-
-	 /* Do not try to assign more components to the vector than it has!
-	  */
-	 if ((rhs_components + base_lhs_component) > lhs_components) {
-	    rhs_components = lhs_components - base_lhs_component;
-	 }
-
-	 const ir_constant *const c = param->as_constant();
-	 if (c != NULL) {
-	    for (unsigned i = 0; i < rhs_components; i++) {
-	       switch (c->type->base_type) {
-	       case GLSL_TYPE_UINT:
-		  data.u[i + base_component] = c->get_uint_component(i);
-		  break;
-	       case GLSL_TYPE_INT:
-		  data.i[i + base_component] = c->get_int_component(i);
-		  break;
-	       case GLSL_TYPE_FLOAT:
-		  data.f[i + base_component] = c->get_float_component(i);
-		  break;
-	       case GLSL_TYPE_BOOL:
-		  data.b[i + base_component] = c->get_bool_component(i);
-		  break;
-	       default:
-		  assert(!"Should not get here.");
-		  break;
-	       }
-	    }
-
-	    /* Mask of fields to be written in the assignment.
-	     */
-	    constant_mask |= ((1U << rhs_components) - 1) << base_lhs_component;
-	    constant_components++;
-
-	    base_component += rhs_components;
-	 }
-	 /* Advance the component index by the number of components
-	  * that were just assigned.
-	  */
-	 base_lhs_component += rhs_components;
-      }
-
-      if (constant_mask != 0) {
-	 ir_dereference *lhs = new(ctx) ir_dereference_variable(var);
-	 const glsl_type *rhs_type = glsl_type::get_instance(var->type->base_type,
-							     constant_components,
-							     1);
-	 ir_rvalue *rhs = new(ctx) ir_constant(rhs_type, &data);
-
-	 ir_instruction *inst =
-	    new(ctx) ir_assignment(lhs, rhs, NULL, constant_mask);
-	 instructions->push_tail(inst);
-      }
-
-      base_component = 0;
-      foreach_list(node, parameters) {
-	 ir_rvalue *param = (ir_rvalue *) node;
-	 unsigned rhs_components = param->type->components();
-
-	 /* Do not try to assign more components to the vector than it has!
-	  */
-	 if ((rhs_components + base_component) > lhs_components) {
-	    rhs_components = lhs_components - base_component;
-	 }
-
-	 const ir_constant *const c = param->as_constant();
-	 if (c == NULL) {
-	    /* Generate a swizzle in case rhs_components != rhs->type->vector_elements. */
-	    unsigned swiz[4] = { 0, 0, 0, 0 };
-	    for (unsigned i = 0; i < rhs_components; i++)
-	       swiz[i] = i;
-
-	    /* Mask of fields to be written in the assignment.
-	     */
-	    const unsigned write_mask = ((1U << rhs_components) - 1)
-	       << base_component;
-
-	    ir_dereference *lhs = new(ctx) ir_dereference_variable(var);
-	    ir_rvalue *rhs = new(ctx) ir_swizzle(param, swiz, rhs_components);
-
-	    ir_instruction *inst =
-	       new(ctx) ir_assignment(lhs, rhs, NULL, write_mask);
-	    instructions->push_tail(inst);
-	 }
-
-	 /* Advance the component index by the number of components that were
-	  * just assigned.
-	  */
-	 base_component += rhs_components;
-      }
-   }
-   return new(ctx) ir_dereference_variable(var);
-}
-
-
-/**
- * Generate assignment of a portion of a vector to a portion of a matrix column
- *
- * \param src_base  First component of the source to be used in assignment
- * \param column    Column of destination to be assiged
- * \param row_base  First component of the destination column to be assigned
- * \param count     Number of components to be assigned
- *
- * \note
- * \c src_base + \c count must be less than or equal to the number of components
- * in the source vector.
- */
-ir_instruction *
-assign_to_matrix_column(ir_variable *var, unsigned column, unsigned row_base,
-			ir_rvalue *src, unsigned src_base, unsigned count,
-			void *mem_ctx)
-{
-   ir_constant *col_idx = new(mem_ctx) ir_constant(column);
-   ir_dereference *column_ref = new(mem_ctx) ir_dereference_array(var, col_idx);
-
-   assert(column_ref->type->components() >= (row_base + count));
-   assert(src->type->components() >= (src_base + count));
-
-   /* Generate a swizzle that puts the first element of the source at the
-    * location of the first element of the destination.
-    */
-   unsigned swiz[4] = { src_base, src_base, src_base, src_base };
-   for (unsigned i = 0; i < count; i++)
-      swiz[i + row_base] = i;
-
-   ir_rvalue *const rhs =
-      new(mem_ctx) ir_swizzle(src, swiz, count);
-
-   /* Mask of fields to be written in the assignment.
-    */
-   const unsigned write_mask = ((1U << count) - 1) << row_base;
-
-   return new(mem_ctx) ir_assignment(column_ref, rhs, NULL, write_mask);
-}
-
-
-/**
- * Generate inline code for a matrix constructor
- *
- * The generated constructor code will consist of a temporary variable
- * declaration of the same type as the constructor.  A sequence of assignments
- * from constructor parameters to the temporary will follow.
- *
- * \return
- * An \c ir_dereference_variable of the temprorary generated in the constructor
- * body.
- */
-ir_rvalue *
-emit_inline_matrix_constructor(const glsl_type *type,
-			       exec_list *instructions,
-			       exec_list *parameters,
-			       void *ctx)
-{
-   assert(!parameters->is_empty());
-
-   ir_variable *var = new(ctx) ir_variable(type, "mat_ctor", ir_var_temporary);
-   instructions->push_tail(var);
-
-   /* There are three kinds of matrix constructors.
-    *
-    *  - Construct a matrix from a single scalar by replicating that scalar to
-    *    along the diagonal of the matrix and setting all other components to
-    *    zero.
-    *
-    *  - Construct a matrix from an arbirary combination of vectors and
-    *    scalars.  The components of the constructor parameters are assigned
-    *    to the matrix in colum-major order until the matrix is full.
-    *
-    *  - Construct a matrix from a single matrix.  The source matrix is copied
-    *    to the upper left portion of the constructed matrix, and the remaining
-    *    elements take values from the identity matrix.
-    */
-   ir_rvalue *const first_param = (ir_rvalue *) parameters->head;
-   if (single_scalar_parameter(parameters)) {
-      /* Assign the scalar to the X component of a vec4, and fill the remaining
-       * components with zero.
-       */
-      ir_variable *rhs_var =
-	 new(ctx) ir_variable(glsl_type::vec4_type, "mat_ctor_vec",
-			      ir_var_temporary);
-      instructions->push_tail(rhs_var);
-
-      ir_constant_data zero;
-      zero.f[0] = 0.0;
-      zero.f[1] = 0.0;
-      zero.f[2] = 0.0;
-      zero.f[3] = 0.0;
-
-      ir_instruction *inst =
-	 new(ctx) ir_assignment(new(ctx) ir_dereference_variable(rhs_var),
-				new(ctx) ir_constant(rhs_var->type, &zero),
-				NULL);
-      instructions->push_tail(inst);
-
-      ir_dereference *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);
-
-      inst = new(ctx) ir_assignment(rhs_ref, first_param, NULL, 0x01);
-      instructions->push_tail(inst);
-
-      /* Assign the temporary vector to each column of the destination matrix
-       * with a swizzle that puts the X component on the diagonal of the
-       * matrix.  In some cases this may mean that the X component does not
-       * get assigned into the column at all (i.e., when the matrix has more
-       * columns than rows).
-       */
-      static const unsigned rhs_swiz[4][4] = {
-	 { 0, 1, 1, 1 },
-	 { 1, 0, 1, 1 },
-	 { 1, 1, 0, 1 },
-	 { 1, 1, 1, 0 }
-      };
-
-      const unsigned cols_to_init = MIN2(type->matrix_columns,
-					 type->vector_elements);
-      for (unsigned i = 0; i < cols_to_init; i++) {
-	 ir_constant *const col_idx = new(ctx) ir_constant(i);
-	 ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx);
-
-	 ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);
-	 ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, rhs_swiz[i],
-						    type->vector_elements);
-
-	 inst = new(ctx) ir_assignment(col_ref, rhs, NULL);
-	 instructions->push_tail(inst);
-      }
-
-      for (unsigned i = cols_to_init; i < type->matrix_columns; i++) {
-	 ir_constant *const col_idx = new(ctx) ir_constant(i);
-	 ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx);
-
-	 ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);
-	 ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, 1, 1, 1, 1,
-						    type->vector_elements);
-
-	 inst = new(ctx) ir_assignment(col_ref, rhs, NULL);
-	 instructions->push_tail(inst);
-      }
-   } else if (first_param->type->is_matrix()) {
-      /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
-       *
-       *     "If a matrix is constructed from a matrix, then each component
-       *     (column i, row j) in the result that has a corresponding
-       *     component (column i, row j) in the argument will be initialized
-       *     from there. All other components will be initialized to the
-       *     identity matrix. If a matrix argument is given to a matrix
-       *     constructor, it is an error to have any other arguments."
-       */
-      assert(first_param->next->is_tail_sentinel());
-      ir_rvalue *const src_matrix = first_param;
-
-      /* If the source matrix is smaller, pre-initialize the relavent parts of
-       * the destination matrix to the identity matrix.
-       */
-      if ((src_matrix->type->matrix_columns < var->type->matrix_columns)
-	  || (src_matrix->type->vector_elements < var->type->vector_elements)) {
-
-	 /* If the source matrix has fewer rows, every column of the destination
-	  * must be initialized.  Otherwise only the columns in the destination
-	  * that do not exist in the source must be initialized.
-	  */
-	 unsigned col =
-	    (src_matrix->type->vector_elements < var->type->vector_elements)
-	    ? 0 : src_matrix->type->matrix_columns;
-
-	 const glsl_type *const col_type = var->type->column_type();
-	 for (/* empty */; col < var->type->matrix_columns; col++) {
-	    ir_constant_data ident;
-
-	    ident.f[0] = 0.0;
-	    ident.f[1] = 0.0;
-	    ident.f[2] = 0.0;
-	    ident.f[3] = 0.0;
-
-	    ident.f[col] = 1.0;
-
-	    ir_rvalue *const rhs = new(ctx) ir_constant(col_type, &ident);
-
-	    ir_rvalue *const lhs =
-	       new(ctx) ir_dereference_array(var, new(ctx) ir_constant(col));
-
-	    ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL);
-	    instructions->push_tail(inst);
-	 }
-      }
-
-      /* Assign columns from the source matrix to the destination matrix.
-       *
-       * Since the parameter will be used in the RHS of multiple assignments,
-       * generate a temporary and copy the paramter there.
-       */
-      ir_variable *const rhs_var =
-	 new(ctx) ir_variable(first_param->type, "mat_ctor_mat",
-			      ir_var_temporary);
-      instructions->push_tail(rhs_var);
-
-      ir_dereference *const rhs_var_ref =
-	 new(ctx) ir_dereference_variable(rhs_var);
-      ir_instruction *const inst =
-	 new(ctx) ir_assignment(rhs_var_ref, first_param, NULL);
-      instructions->push_tail(inst);
-
-      const unsigned last_row = MIN2(src_matrix->type->vector_elements,
-				     var->type->vector_elements);
-      const unsigned last_col = MIN2(src_matrix->type->matrix_columns,
-				     var->type->matrix_columns);
-
-      unsigned swiz[4] = { 0, 0, 0, 0 };
-      for (unsigned i = 1; i < last_row; i++)
-	 swiz[i] = i;
-
-      const unsigned write_mask = (1U << last_row) - 1;
-
-      for (unsigned i = 0; i < last_col; i++) {
-	 ir_dereference *const lhs =
-	    new(ctx) ir_dereference_array(var, new(ctx) ir_constant(i));
-	 ir_rvalue *const rhs_col =
-	    new(ctx) ir_dereference_array(rhs_var, new(ctx) ir_constant(i));
-
-	 /* If one matrix has columns that are smaller than the columns of the
-	  * other matrix, wrap the column access of the larger with a swizzle
-	  * so that the LHS and RHS of the assignment have the same size (and
-	  * therefore have the same type).
-	  *
-	  * It would be perfectly valid to unconditionally generate the
-	  * swizzles, this this will typically result in a more compact IR tree.
-	  */
-	 ir_rvalue *rhs;
-	 if (lhs->type->vector_elements != rhs_col->type->vector_elements) {
-	    rhs = new(ctx) ir_swizzle(rhs_col, swiz, last_row);
-	 } else {
-	    rhs = rhs_col;
-	 }
-
-	 ir_instruction *inst =
-	    new(ctx) ir_assignment(lhs, rhs, NULL, write_mask);
-	 instructions->push_tail(inst);
-      }
-   } else {
-      const unsigned cols = type->matrix_columns;
-      const unsigned rows = type->vector_elements;
-      unsigned col_idx = 0;
-      unsigned row_idx = 0;
-
-      foreach_list (node, parameters) {
-	 ir_rvalue *const rhs = (ir_rvalue *) node;
-	 const unsigned components_remaining_this_column = rows - row_idx;
-	 unsigned rhs_components = rhs->type->components();
-	 unsigned rhs_base = 0;
-
-	 /* Since the parameter might be used in the RHS of two assignments,
-	  * generate a temporary and copy the paramter there.
-	  */
-	 ir_variable *rhs_var =
-	    new(ctx) ir_variable(rhs->type, "mat_ctor_vec", ir_var_temporary);
-	 instructions->push_tail(rhs_var);
-
-	 ir_dereference *rhs_var_ref =
-	    new(ctx) ir_dereference_variable(rhs_var);
-	 ir_instruction *inst = new(ctx) ir_assignment(rhs_var_ref, rhs, NULL);
-	 instructions->push_tail(inst);
-
-	 /* Assign the current parameter to as many components of the matrix
-	  * as it will fill.
-	  *
-	  * NOTE: A single vector parameter can span two matrix columns.  A
-	  * single vec4, for example, can completely fill a mat2.
-	  */
-	 if (rhs_components >= components_remaining_this_column) {
-	    const unsigned count = MIN2(rhs_components,
-					components_remaining_this_column);
-
-	    rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var);
-
-	    ir_instruction *inst = assign_to_matrix_column(var, col_idx,
-							   row_idx,
-							   rhs_var_ref, 0,
-							   count, ctx);
-	    instructions->push_tail(inst);
-
-	    rhs_base = count;
-
-	    col_idx++;
-	    row_idx = 0;
-	 }
-
-	 /* If there is data left in the parameter and components left to be
-	  * set in the destination, emit another assignment.  It is possible
-	  * that the assignment could be of a vec4 to the last element of the
-	  * matrix.  In this case col_idx==cols, but there is still data
-	  * left in the source parameter.  Obviously, don't emit an assignment
-	  * to data outside the destination matrix.
-	  */
-	 if ((col_idx < cols) && (rhs_base < rhs_components)) {
-	    const unsigned count = rhs_components - rhs_base;
-
-	    rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var);
-
-	    ir_instruction *inst = assign_to_matrix_column(var, col_idx,
-							   row_idx,
-							   rhs_var_ref,
-							   rhs_base,
-							   count, ctx);
-	    instructions->push_tail(inst);
-
-	    row_idx += count;
-	 }
-      }
-   }
-
-   return new(ctx) ir_dereference_variable(var);
-}
-
-
-ir_rvalue *
-emit_inline_record_constructor(const glsl_type *type,
-			       exec_list *instructions,
-			       exec_list *parameters,
-			       void *mem_ctx)
-{
-   ir_variable *const var =
-      new(mem_ctx) ir_variable(type, "record_ctor", ir_var_temporary);
-   ir_dereference_variable *const d = new(mem_ctx) ir_dereference_variable(var);
-
-   instructions->push_tail(var);
-
-   exec_node *node = parameters->head;
-   for (unsigned i = 0; i < type->length; i++) {
-      assert(!node->is_tail_sentinel());
-
-      ir_dereference *const lhs =
-	 new(mem_ctx) ir_dereference_record(d->clone(mem_ctx, NULL),
-					    type->fields.structure[i].name);
-
-      ir_rvalue *const rhs = ((ir_instruction *) node)->as_rvalue();
-      assert(rhs != NULL);
-
-      ir_instruction *const assign = new(mem_ctx) ir_assignment(lhs, rhs, NULL);
-
-      instructions->push_tail(assign);
-      node = node->next;
-   }
-
-   return d;
-}
-
-
-ir_rvalue *
-ast_function_expression::hir(exec_list *instructions,
-			     struct _mesa_glsl_parse_state *state)
-{
-   void *ctx = state;
-   /* There are three sorts of function calls.
-    *
-    * 1. constructors - The first subexpression is an ast_type_specifier.
-    * 2. methods - Only the .length() method of array types.
-    * 3. functions - Calls to regular old functions.
-    *
-    * Method calls are actually detected when the ast_field_selection
-    * expression is handled.
-    */
-   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 = type->glsl_type(& name, state);
-
-
-      /* Constructors for samplers are illegal.
-       */
-      if (constructor_type->is_sampler()) {
-	 _mesa_glsl_error(& loc, state, "cannot construct sampler type `%s'",
-			  constructor_type->name);
-	 return ir_call::get_error_instruction(ctx);
-      }
-
-      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(ctx);
-	 }
-
-	 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
-       * requirement is that the parameters must provide enough values of the
-       * correct scalar type.  Constructors for arrays and structures must
-       * have the exact number of parameters with matching types in the
-       * correct order.  These constructors follow essentially the same type
-       * matching rules as functions.
-       */
-      if (!constructor_type->is_numeric() && !constructor_type->is_boolean())
-	 return ir_call::get_error_instruction(ctx);
-
-      /* 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;
-
-      foreach_list (n, &this->expressions) {
-	 ast_node *ast = exec_node_data(ast_node, n, link);
-	 ir_rvalue *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(ctx);
-	 }
-
-	 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(ctx);
-	 }
-
-	 /* 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++;
-
-	 actual_parameters.push_tail(result);
-	 components_used += result->type->components();
-      }
-
-      /* 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(ctx);
-      }
-
-      /* 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(ctx);
-      }
-
-      /* 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
-	  && matrix_parameters == 0) {
-	 _mesa_glsl_error(& loc, state, "too few components to construct "
-			  "`%s'",
-			  constructor_type->name);
-	 return ir_call::get_error_instruction(ctx);
-      }
-
-      /* Later, we cast each parameter to the same base type as the
-       * constructor.  Since there are no non-floating point matrices, we
-       * need to break them up into a series of column vectors.
-       */
-      if (constructor_type->base_type != GLSL_TYPE_FLOAT) {
-	 foreach_list_safe(n, &actual_parameters) {
-	    ir_rvalue *matrix = (ir_rvalue *) n;
-
-	    if (!matrix->type->is_matrix())
-	       continue;
-
-	    /* Create a temporary containing the matrix. */
-	    ir_variable *var = new(ctx) ir_variable(matrix->type, "matrix_tmp",
-						    ir_var_temporary);
-	    instructions->push_tail(var);
-	    instructions->push_tail(new(ctx) ir_assignment(new(ctx)
-	       ir_dereference_variable(var), matrix, NULL));
-	    var->constant_value = matrix->constant_expression_value();
-
-	    /* Replace the matrix with dereferences of its columns. */
-	    for (int i = 0; i < matrix->type->matrix_columns; i++) {
-	       matrix->insert_before(new (ctx) ir_dereference_array(var,
-		  new(ctx) ir_constant(i)));
-	    }
-	    matrix->remove();
-	 }
-      }
-
-      bool all_parameters_are_constant = true;
-
-      /* Type cast each parameter and, if possible, fold constants.*/
-      foreach_list_safe(n, &actual_parameters) {
-	 ir_rvalue *ir = (ir_rvalue *) n;
-
-	 const glsl_type *desired_type =
-	    glsl_type::get_instance(constructor_type->base_type,
-				    ir->type->vector_elements,
-				    ir->type->matrix_columns);
-	 ir_rvalue *result = convert_component(ir, desired_type);
-
-	 /* Attempt to convert the parameter to a constant valued expression.
-	  * After doing so, track whether or not all the parameters to the
-	  * constructor are trivially constant valued expressions.
-	  */
-	 ir_rvalue *const constant = result->constant_expression_value();
-
-	 if (constant != NULL)
-	    result = constant;
-	 else
-	    all_parameters_are_constant = false;
-
-	 if (result != ir) {
-	    ir->replace_with(result);
-	 }
-      }
-
-      /* If all of the parameters are trivially constant, create a
-       * constant representing the complete collection of parameters.
-       */
-      if (all_parameters_are_constant) {
-	 return new(ctx) ir_constant(constructor_type, &actual_parameters);
-      } else if (constructor_type->is_scalar()) {
-	 return dereference_component((ir_rvalue *) actual_parameters.head,
-				      0);
-      } else if (constructor_type->is_vector()) {
-	 return emit_inline_vector_constructor(constructor_type,
-					       instructions,
-					       &actual_parameters,
-					       ctx);
-      } else {
-	 assert(constructor_type->is_matrix());
-	 return emit_inline_matrix_constructor(constructor_type,
-					       instructions,
-					       &actual_parameters,
-					       ctx);
-      }
-   } else {
-      const ast_expression *id = subexpressions[0];
-      YYLTYPE loc = id->get_location();
-      exec_list actual_parameters;
-
-      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);
-   }
-
-   return ir_call::get_error_instruction(ctx);
-}
+/*

+ * Copyright © 2010 Intel Corporation

+ *

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the "Software"),

+ * to deal in the Software without restriction, including without limitation

+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,

+ * and/or sell copies of the Software, and to permit persons to whom the

+ * Software is furnished to do so, subject to the following conditions:

+ *

+ * The above copyright notice and this permission notice (including the next

+ * paragraph) shall be included in all copies or substantial portions of the

+ * Software.

+ *

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

+ * DEALINGS IN THE SOFTWARE.

+ */

+

+#include "glsl_symbol_table.h"

+#include "ast.h"

+#include "glsl_types.h"

+#include "ir.h"

+#include "main/core.h" /* for MIN2 */

+

+static ir_rvalue *

+convert_component(ir_rvalue *src, const glsl_type *desired_type);

+

+bool

+apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,

+                          struct _mesa_glsl_parse_state *state);

+

+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 *result = ast->hir(instructions, state);

+

+      ir_constant *const constant = result->constant_expression_value();

+      if (constant != NULL)

+	 result = constant;

+

+      actual_parameters->push_tail(result);

+      count++;

+   }

+

+   return count;

+}

+

+

+/**

+ * Generate a source prototype for a function signature

+ *

+ * \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.

+ *

+ * \return

+ * A talloced string representing the prototype of the function.

+ */

+char *

+prototype_string(const glsl_type *return_type, const char *name,

+		 exec_list *parameters)

+{

+   char *str = NULL;

+

+   if (return_type != NULL)

+      str = talloc_asprintf(str, "%s ", return_type->name);

+

+   str = talloc_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);

+      comma = ", ";

+   }

+

+   str = talloc_strdup_append(str, ")");

+   return str;

+}

+

+

+static ir_rvalue *

+match_function_by_name(exec_list *instructions, const char *name,

+		       YYLTYPE *loc, exec_list *actual_parameters,

+		       struct _mesa_glsl_parse_state *state)

+{

+   void *ctx = state;

+   ir_function *f = state->symbols->get_function(name);

+   ir_function_signature *sig;

+

+   sig = f ? f->matching_signature(actual_parameters) : NULL;

+

+   /* FINISHME: This doesn't handle the case where shader X contains a

+    * 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)) {

+      /* The current shader doesn't contain a matching function or signature.

+       * Before giving up, look for the prototype in the built-in functions.

+       */

+      for (unsigned i = 0; i < state->num_builtins_to_link; i++) {

+	 ir_function *builtin;

+	 builtin = state->builtins_to_link[i]->symbols->get_function(name);

+	 sig = builtin ? builtin->matching_signature(actual_parameters) : NULL;

+	 if (sig != NULL) {

+	    if (f == NULL) {

+	       f = new(ctx) ir_function(name);

+	       state->symbols->add_global_function(f);

+	       emit_function(state, instructions, f);

+	    }

+

+	    f->add_signature(sig->clone_prototype(f, NULL));

+	    break;

+	 }

+      }

+   }

+

+   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");

+	    }

+	 }

+

+	 if (formal->type->is_numeric() || formal->type->is_boolean()) {

+	    ir_rvalue *converted = convert_component(actual, formal->type);

+	    actual->replace_with(converted);

+	 }

+

+	 actual_iter.next();

+	 formal_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.

+       */

+      ir_call *call = new(ctx) ir_call(sig, actual_parameters);

+      if (!sig->return_type->is_void()) {

+	 ir_variable *var;

+	 ir_dereference_variable *deref;

+

+	 var = new(ctx) ir_variable(sig->return_type,

+				    talloc_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;

+      }

+   } 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);

+

+      const char *prefix = "candidates are: ";

+

+      for (int i = -1; i < 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);

+	 if (f == NULL)

+	    continue;

+

+	 foreach_list (node, &f->signatures) {

+	    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);

+

+	    prefix = "                ";

+	 }

+

+      }

+

+      return ir_call::get_error_instruction(ctx);

+   }

+}

+

+

+/**

+ * Perform automatic type conversion of constructor parameters

+ *

+ * This implements the rules in the "Conversion and Scalar Constructors"

+ * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.

+ */

+static ir_rvalue *

+convert_component(ir_rvalue *src, const glsl_type *desired_type)

+{

+   void *ctx = talloc_parent(src);

+   const unsigned a = desired_type->base_type;

+   const unsigned b = src->type->base_type;

+   ir_expression *result = NULL;

+

+   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)

+	 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);

+      }

+      break;

+   case GLSL_TYPE_FLOAT:

+      switch (b) {

+      case GLSL_TYPE_UINT:

+	 result = new(ctx) ir_expression(ir_unop_u2f, desired_type, src, NULL);

+	 break;

+      case GLSL_TYPE_INT:

+	 result = new(ctx) ir_expression(ir_unop_i2f, desired_type, src, NULL);

+	 break;

+      case GLSL_TYPE_BOOL:

+	 result = new(ctx) ir_expression(ir_unop_b2f, desired_type, src, NULL);

+	 break;

+      }

+      break;

+   case GLSL_TYPE_BOOL:

+      switch (b) {

+      case GLSL_TYPE_UINT:

+      case GLSL_TYPE_INT:

+	 result = new(ctx) ir_expression(ir_unop_i2b, desired_type, src, NULL);

+	 break;

+      case GLSL_TYPE_FLOAT:

+	 result = new(ctx) ir_expression(ir_unop_f2b, desired_type, src, NULL);

+	 break;

+      }

+      break;

+   }

+

+   assert(result != NULL);

+

+   /* Try constant folding; it may fold in the conversion we just added. */

+   ir_constant *const constant = result->constant_expression_value();

+   return (constant != NULL) ? (ir_rvalue *) constant : (ir_rvalue *) result;

+}

+

+/**

+ * Dereference a specific component from a scalar, vector, or matrix

+ */

+static ir_rvalue *

+dereference_component(ir_rvalue *src, unsigned component)

+{

+   void *ctx = talloc_parent(src);

+   assert(component < src->type->components());

+

+   /* If the source is a constant, just create a new constant instead of a

+    * dereference of the existing constant.

+    */

+   ir_constant *constant = src->as_constant();

+   if (constant)

+      return new(ctx) ir_constant(constant, component);

+

+   if (src->type->is_scalar()) {

+      return src;

+   } else if (src->type->is_vector()) {

+      return new(ctx) ir_swizzle(src, component, 0, 0, 0, 1);

+   } else {

+      assert(src->type->is_matrix());

+

+      /* Dereference a row of the matrix, then call this function again to get

+       * a specific element from that row.

+       */

+      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(ctx) ir_constant(c);

+      ir_dereference *const col = new(ctx) ir_dereference_array(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)

+{

+   void *ctx = 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(ctx);

+   }

+

+   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);

+   }

+

+   bool all_parameters_are_constant = true;

+

+   /* Type cast each parameter and, if possible, fold constants. */

+   foreach_list_safe(n, &actual_parameters) {

+      ir_rvalue *ir = (ir_rvalue *) n;

+      ir_rvalue *result = ir;

+

+      /* Apply implicit conversions (not the scalar constructor rules!) */

+      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 != constructor_type->element_type()) {

+	 _mesa_glsl_error(loc, state, "type error in array constructor: "

+			  "expected: %s, found %s",

+			  constructor_type->element_type()->name,

+			  result->type->name);

+      }

+

+      /* Attempt to convert the parameter to a constant valued expression.

+       * After doing so, track whether or not all the parameters to the

+       * constructor are trivially constant valued expressions.

+       */

+      ir_rvalue *const constant = result->constant_expression_value();

+

+      if (constant != NULL)

+         result = constant;

+      else

+         all_parameters_are_constant = false;

+

+      ir->replace_with(result);

+   }

+

+   if (all_parameters_are_constant)

+      return new(ctx) ir_constant(constructor_type, &actual_parameters);

+

+   ir_variable *var = new(ctx) ir_variable(constructor_type, "array_ctor",

+					   ir_var_temporary);

+   instructions->push_tail(var);

+

+   int i = 0;

+   foreach_list(node, &actual_parameters) {

+      ir_rvalue *rhs = (ir_rvalue *) node;

+      ir_rvalue *lhs = new(ctx) ir_dereference_array(var,

+						     new(ctx) ir_constant(i));

+

+      ir_instruction *assignment = new(ctx) ir_assignment(lhs, rhs, NULL);

+      instructions->push_tail(assignment);

+

+      i++;

+   }

+

+   return new(ctx) ir_dereference_variable(var);

+}

+

+

+/**

+ * Try to convert a record constructor to a constant expression

+ */

+static ir_constant *

+constant_record_constructor(const glsl_type *constructor_type,

+			    exec_list *parameters, void *mem_ctx)

+{

+   foreach_list(node, parameters) {

+      ir_constant *constant = ((ir_instruction *) node)->as_constant();

+      if (constant == NULL)

+	 return NULL;

+      node->replace_with(constant);

+   }

+

+   return new(mem_ctx) ir_constant(constructor_type, parameters);

+}

+

+

+/**

+ * Determine if a list consists of a single scalar r-value

+ */

+bool

+single_scalar_parameter(exec_list *parameters)

+{

+   const ir_rvalue *const p = (ir_rvalue *) parameters->head;

+   assert(((ir_rvalue *)p)->as_rvalue() != NULL);

+

+   return (p->type->is_scalar() && p->next->is_tail_sentinel());

+}

+

+

+/**

+ * Generate inline code for a vector constructor

+ *

+ * The generated constructor code will consist of a temporary variable

+ * declaration of the same type as the constructor.  A sequence of assignments

+ * from constructor parameters to the temporary will follow.

+ *

+ * \return

+ * An \c ir_dereference_variable of the temprorary generated in the constructor

+ * body.

+ */

+ir_rvalue *

+emit_inline_vector_constructor(const glsl_type *type,

+			       exec_list *instructions,

+			       exec_list *parameters,

+			       void *ctx)

+{

+   assert(!parameters->is_empty());

+

+   ir_variable *var = new(ctx) ir_variable(type, "vec_ctor", ir_var_temporary);

+   instructions->push_tail(var);

+

+   /* There are two kinds of vector constructors.

+    *

+    *  - Construct a vector from a single scalar by replicating that scalar to

+    *    all components of the vector.

+    *

+    *  - Construct a vector from an arbirary combination of vectors and

+    *    scalars.  The components of the constructor parameters are assigned

+    *    to the vector in order until the vector is full.

+    */

+   const unsigned lhs_components = type->components();

+   if (single_scalar_parameter(parameters)) {

+      ir_rvalue *first_param = (ir_rvalue *)parameters->head;

+      ir_rvalue *rhs = new(ctx) ir_swizzle(first_param, 0, 0, 0, 0,

+					   lhs_components);

+      ir_dereference_variable *lhs = new(ctx) ir_dereference_variable(var);

+      const unsigned mask = (1U << lhs_components) - 1;

+

+      assert(rhs->type == lhs->type);

+

+      ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL, mask);

+      instructions->push_tail(inst);

+   } else {

+      unsigned base_component = 0;

+      unsigned base_lhs_component = 0;

+      ir_constant_data data;

+      unsigned constant_mask = 0, constant_components = 0;

+

+      memset(&data, 0, sizeof(data));

+

+      foreach_list(node, parameters) {

+	 ir_rvalue *param = (ir_rvalue *) node;

+	 unsigned rhs_components = param->type->components();

+

+	 /* Do not try to assign more components to the vector than it has!

+	  */

+	 if ((rhs_components + base_lhs_component) > lhs_components) {

+	    rhs_components = lhs_components - base_lhs_component;

+	 }

+

+	 const ir_constant *const c = param->as_constant();

+	 if (c != NULL) {

+	    for (unsigned i = 0; i < rhs_components; i++) {

+	       switch (c->type->base_type) {

+	       case GLSL_TYPE_UINT:

+		  data.u[i + base_component] = c->get_uint_component(i);

+		  break;

+	       case GLSL_TYPE_INT:

+		  data.i[i + base_component] = c->get_int_component(i);

+		  break;

+	       case GLSL_TYPE_FLOAT:

+		  data.f[i + base_component] = c->get_float_component(i);

+		  break;

+	       case GLSL_TYPE_BOOL:

+		  data.b[i + base_component] = c->get_bool_component(i);

+		  break;

+	       default:

+		  assert(!"Should not get here.");

+		  break;

+	       }

+	    }

+

+	    /* Mask of fields to be written in the assignment.

+	     */

+	    constant_mask |= ((1U << rhs_components) - 1) << base_lhs_component;

+	    constant_components += rhs_components;

+

+	    base_component += rhs_components;

+	 }

+	 /* Advance the component index by the number of components

+	  * that were just assigned.

+	  */

+	 base_lhs_component += rhs_components;

+      }

+

+      if (constant_mask != 0) {

+	 ir_dereference *lhs = new(ctx) ir_dereference_variable(var);

+	 const glsl_type *rhs_type = glsl_type::get_instance(var->type->base_type,

+							     constant_components,

+							     1);

+	 ir_rvalue *rhs = new(ctx) ir_constant(rhs_type, &data);

+

+	 ir_instruction *inst =

+	    new(ctx) ir_assignment(lhs, rhs, NULL, constant_mask);

+	 instructions->push_tail(inst);

+      }

+

+      base_component = 0;

+      foreach_list(node, parameters) {

+	 ir_rvalue *param = (ir_rvalue *) node;

+	 unsigned rhs_components = param->type->components();

+

+	 /* Do not try to assign more components to the vector than it has!

+	  */

+	 if ((rhs_components + base_component) > lhs_components) {

+	    rhs_components = lhs_components - base_component;

+	 }

+

+	 const ir_constant *const c = param->as_constant();

+	 if (c == NULL) {

+	    /* Mask of fields to be written in the assignment.

+	     */

+	    const unsigned write_mask = ((1U << rhs_components) - 1)

+	       << base_component;

+

+	    ir_dereference *lhs = new(ctx) ir_dereference_variable(var);

+

+	    /* Generate a swizzle so that LHS and RHS sizes match.

+	     */

+	    ir_rvalue *rhs =

+	       new(ctx) ir_swizzle(param, 0, 1, 2, 3, rhs_components);

+

+	    ir_instruction *inst =

+	       new(ctx) ir_assignment(lhs, rhs, NULL, write_mask);

+	    instructions->push_tail(inst);

+	 }

+

+	 /* Advance the component index by the number of components that were

+	  * just assigned.

+	  */

+	 base_component += rhs_components;

+      }

+   }

+   return new(ctx) ir_dereference_variable(var);

+}

+

+

+/**

+ * Generate assignment of a portion of a vector to a portion of a matrix column

+ *

+ * \param src_base  First component of the source to be used in assignment

+ * \param column    Column of destination to be assiged

+ * \param row_base  First component of the destination column to be assigned

+ * \param count     Number of components to be assigned

+ *

+ * \note

+ * \c src_base + \c count must be less than or equal to the number of components

+ * in the source vector.

+ */

+ir_instruction *

+assign_to_matrix_column(ir_variable *var, unsigned column, unsigned row_base,

+			ir_rvalue *src, unsigned src_base, unsigned count,

+			void *mem_ctx)

+{

+   ir_constant *col_idx = new(mem_ctx) ir_constant(column);

+   ir_dereference *column_ref = new(mem_ctx) ir_dereference_array(var, col_idx);

+

+   assert(column_ref->type->components() >= (row_base + count));

+   assert(src->type->components() >= (src_base + count));

+

+   /* Generate a swizzle that extracts the number of components from the source

+    * that are to be assigned to the column of the matrix.

+    */

+   if (count < src->type->vector_elements) {

+      src = new(mem_ctx) ir_swizzle(src,

+				    src_base + 0, src_base + 1,

+				    src_base + 2, src_base + 3,

+				    count);

+   }

+

+   /* Mask of fields to be written in the assignment.

+    */

+   const unsigned write_mask = ((1U << count) - 1) << row_base;

+

+   return new(mem_ctx) ir_assignment(column_ref, src, NULL, write_mask);

+}

+

+

+/**

+ * Generate inline code for a matrix constructor

+ *

+ * The generated constructor code will consist of a temporary variable

+ * declaration of the same type as the constructor.  A sequence of assignments

+ * from constructor parameters to the temporary will follow.

+ *

+ * \return

+ * An \c ir_dereference_variable of the temprorary generated in the constructor

+ * body.

+ */

+ir_rvalue *

+emit_inline_matrix_constructor(const glsl_type *type,

+			       exec_list *instructions,

+			       exec_list *parameters,

+			       void *ctx)

+{

+   assert(!parameters->is_empty());

+

+   ir_variable *var = new(ctx) ir_variable(type, "mat_ctor", ir_var_temporary);

+   instructions->push_tail(var);

+

+   /* There are three kinds of matrix constructors.

+    *

+    *  - Construct a matrix from a single scalar by replicating that scalar to

+    *    along the diagonal of the matrix and setting all other components to

+    *    zero.

+    *

+    *  - Construct a matrix from an arbirary combination of vectors and

+    *    scalars.  The components of the constructor parameters are assigned

+    *    to the matrix in colum-major order until the matrix is full.

+    *

+    *  - Construct a matrix from a single matrix.  The source matrix is copied

+    *    to the upper left portion of the constructed matrix, and the remaining

+    *    elements take values from the identity matrix.

+    */

+   ir_rvalue *const first_param = (ir_rvalue *) parameters->head;

+   if (single_scalar_parameter(parameters)) {

+      /* Assign the scalar to the X component of a vec4, and fill the remaining

+       * components with zero.

+       */

+      ir_variable *rhs_var =

+	 new(ctx) ir_variable(glsl_type::vec4_type, "mat_ctor_vec",

+			      ir_var_temporary);

+      instructions->push_tail(rhs_var);

+

+      ir_constant_data zero;

+      zero.f[0] = 0.0;

+      zero.f[1] = 0.0;

+      zero.f[2] = 0.0;

+      zero.f[3] = 0.0;

+

+      ir_instruction *inst =

+	 new(ctx) ir_assignment(new(ctx) ir_dereference_variable(rhs_var),

+				new(ctx) ir_constant(rhs_var->type, &zero),

+				NULL);

+      instructions->push_tail(inst);

+

+      ir_dereference *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);

+

+      inst = new(ctx) ir_assignment(rhs_ref, first_param, NULL, 0x01);

+      instructions->push_tail(inst);

+

+      /* Assign the temporary vector to each column of the destination matrix

+       * with a swizzle that puts the X component on the diagonal of the

+       * matrix.  In some cases this may mean that the X component does not

+       * get assigned into the column at all (i.e., when the matrix has more

+       * columns than rows).

+       */

+      static const unsigned rhs_swiz[4][4] = {

+	 { 0, 1, 1, 1 },

+	 { 1, 0, 1, 1 },

+	 { 1, 1, 0, 1 },

+	 { 1, 1, 1, 0 }

+      };

+

+      const unsigned cols_to_init = MIN2(type->matrix_columns,

+					 type->vector_elements);

+      for (unsigned i = 0; i < cols_to_init; i++) {

+	 ir_constant *const col_idx = new(ctx) ir_constant(i);

+	 ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx);

+

+	 ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);

+	 ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, rhs_swiz[i],

+						    type->vector_elements);

+

+	 inst = new(ctx) ir_assignment(col_ref, rhs, NULL);

+	 instructions->push_tail(inst);

+      }

+

+      for (unsigned i = cols_to_init; i < type->matrix_columns; i++) {

+	 ir_constant *const col_idx = new(ctx) ir_constant(i);

+	 ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx);

+

+	 ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);

+	 ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, 1, 1, 1, 1,

+						    type->vector_elements);

+

+	 inst = new(ctx) ir_assignment(col_ref, rhs, NULL);

+	 instructions->push_tail(inst);

+      }

+   } else if (first_param->type->is_matrix()) {

+      /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:

+       *

+       *     "If a matrix is constructed from a matrix, then each component

+       *     (column i, row j) in the result that has a corresponding

+       *     component (column i, row j) in the argument will be initialized

+       *     from there. All other components will be initialized to the

+       *     identity matrix. If a matrix argument is given to a matrix

+       *     constructor, it is an error to have any other arguments."

+       */

+      assert(first_param->next->is_tail_sentinel());

+      ir_rvalue *const src_matrix = first_param;

+

+      /* If the source matrix is smaller, pre-initialize the relavent parts of

+       * the destination matrix to the identity matrix.

+       */

+      if ((src_matrix->type->matrix_columns < var->type->matrix_columns)

+	  || (src_matrix->type->vector_elements < var->type->vector_elements)) {

+

+	 /* If the source matrix has fewer rows, every column of the destination

+	  * must be initialized.  Otherwise only the columns in the destination

+	  * that do not exist in the source must be initialized.

+	  */

+	 unsigned col =

+	    (src_matrix->type->vector_elements < var->type->vector_elements)

+	    ? 0 : src_matrix->type->matrix_columns;

+

+	 const glsl_type *const col_type = var->type->column_type();

+	 for (/* empty */; col < var->type->matrix_columns; col++) {

+	    ir_constant_data ident;

+

+	    ident.f[0] = 0.0;

+	    ident.f[1] = 0.0;

+	    ident.f[2] = 0.0;

+	    ident.f[3] = 0.0;

+

+	    ident.f[col] = 1.0;

+

+	    ir_rvalue *const rhs = new(ctx) ir_constant(col_type, &ident);

+

+	    ir_rvalue *const lhs =

+	       new(ctx) ir_dereference_array(var, new(ctx) ir_constant(col));

+

+	    ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL);

+	    instructions->push_tail(inst);

+	 }

+      }

+

+      /* Assign columns from the source matrix to the destination matrix.

+       *

+       * Since the parameter will be used in the RHS of multiple assignments,

+       * generate a temporary and copy the paramter there.

+       */

+      ir_variable *const rhs_var =

+	 new(ctx) ir_variable(first_param->type, "mat_ctor_mat",

+			      ir_var_temporary);

+      instructions->push_tail(rhs_var);

+

+      ir_dereference *const rhs_var_ref =

+	 new(ctx) ir_dereference_variable(rhs_var);

+      ir_instruction *const inst =

+	 new(ctx) ir_assignment(rhs_var_ref, first_param, NULL);

+      instructions->push_tail(inst);

+

+      const unsigned last_row = MIN2(src_matrix->type->vector_elements,

+				     var->type->vector_elements);

+      const unsigned last_col = MIN2(src_matrix->type->matrix_columns,

+				     var->type->matrix_columns);

+

+      unsigned swiz[4] = { 0, 0, 0, 0 };

+      for (unsigned i = 1; i < last_row; i++)

+	 swiz[i] = i;

+

+      const unsigned write_mask = (1U << last_row) - 1;

+

+      for (unsigned i = 0; i < last_col; i++) {

+	 ir_dereference *const lhs =

+	    new(ctx) ir_dereference_array(var, new(ctx) ir_constant(i));

+	 ir_rvalue *const rhs_col =

+	    new(ctx) ir_dereference_array(rhs_var, new(ctx) ir_constant(i));

+

+	 /* If one matrix has columns that are smaller than the columns of the

+	  * other matrix, wrap the column access of the larger with a swizzle

+	  * so that the LHS and RHS of the assignment have the same size (and

+	  * therefore have the same type).

+	  *

+	  * It would be perfectly valid to unconditionally generate the

+	  * swizzles, this this will typically result in a more compact IR tree.

+	  */

+	 ir_rvalue *rhs;

+	 if (lhs->type->vector_elements != rhs_col->type->vector_elements) {

+	    rhs = new(ctx) ir_swizzle(rhs_col, swiz, last_row);

+	 } else {

+	    rhs = rhs_col;

+	 }

+

+	 ir_instruction *inst =

+	    new(ctx) ir_assignment(lhs, rhs, NULL, write_mask);

+	 instructions->push_tail(inst);

+      }

+   } else {

+      const unsigned cols = type->matrix_columns;

+      const unsigned rows = type->vector_elements;

+      unsigned col_idx = 0;

+      unsigned row_idx = 0;

+

+      foreach_list (node, parameters) {

+	 ir_rvalue *const rhs = (ir_rvalue *) node;

+	 const unsigned components_remaining_this_column = rows - row_idx;

+	 unsigned rhs_components = rhs->type->components();

+	 unsigned rhs_base = 0;

+

+	 /* Since the parameter might be used in the RHS of two assignments,

+	  * generate a temporary and copy the paramter there.

+	  */

+	 ir_variable *rhs_var =

+	    new(ctx) ir_variable(rhs->type, "mat_ctor_vec", ir_var_temporary);

+	 instructions->push_tail(rhs_var);

+

+	 ir_dereference *rhs_var_ref =

+	    new(ctx) ir_dereference_variable(rhs_var);

+	 ir_instruction *inst = new(ctx) ir_assignment(rhs_var_ref, rhs, NULL);

+	 instructions->push_tail(inst);

+

+	 /* Assign the current parameter to as many components of the matrix

+	  * as it will fill.

+	  *

+	  * NOTE: A single vector parameter can span two matrix columns.  A

+	  * single vec4, for example, can completely fill a mat2.

+	  */

+	 if (rhs_components >= components_remaining_this_column) {

+	    const unsigned count = MIN2(rhs_components,

+					components_remaining_this_column);

+

+	    rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var);

+

+	    ir_instruction *inst = assign_to_matrix_column(var, col_idx,

+							   row_idx,

+							   rhs_var_ref, 0,

+							   count, ctx);

+	    instructions->push_tail(inst);

+

+	    rhs_base = count;

+

+	    col_idx++;

+	    row_idx = 0;

+	 }

+

+	 /* If there is data left in the parameter and components left to be

+	  * set in the destination, emit another assignment.  It is possible

+	  * that the assignment could be of a vec4 to the last element of the

+	  * matrix.  In this case col_idx==cols, but there is still data

+	  * left in the source parameter.  Obviously, don't emit an assignment

+	  * to data outside the destination matrix.

+	  */

+	 if ((col_idx < cols) && (rhs_base < rhs_components)) {

+	    const unsigned count = rhs_components - rhs_base;

+

+	    rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var);

+

+	    ir_instruction *inst = assign_to_matrix_column(var, col_idx,

+							   row_idx,

+							   rhs_var_ref,

+							   rhs_base,

+							   count, ctx);

+	    instructions->push_tail(inst);

+

+	    row_idx += count;

+	 }

+      }

+   }

+

+   return new(ctx) ir_dereference_variable(var);

+}

+

+

+ir_rvalue *

+emit_inline_record_constructor(const glsl_type *type,

+			       exec_list *instructions,

+			       exec_list *parameters,

+			       void *mem_ctx)

+{

+   ir_variable *const var =

+      new(mem_ctx) ir_variable(type, "record_ctor", ir_var_temporary);

+   ir_dereference_variable *const d = new(mem_ctx) ir_dereference_variable(var);

+

+   instructions->push_tail(var);

+

+   exec_node *node = parameters->head;

+   for (unsigned i = 0; i < type->length; i++) {

+      assert(!node->is_tail_sentinel());

+

+      ir_dereference *const lhs =

+	 new(mem_ctx) ir_dereference_record(d->clone(mem_ctx, NULL),

+					    type->fields.structure[i].name);

+

+      ir_rvalue *const rhs = ((ir_instruction *) node)->as_rvalue();

+      assert(rhs != NULL);

+

+      ir_instruction *const assign = new(mem_ctx) ir_assignment(lhs, rhs, NULL);

+

+      instructions->push_tail(assign);

+      node = node->next;

+   }

+

+   return d;

+}

+

+

+ir_rvalue *

+ast_function_expression::hir(exec_list *instructions,

+			     struct _mesa_glsl_parse_state *state)

+{

+   void *ctx = state;

+   /* There are three sorts of function calls.

+    *

+    * 1. constructors - The first subexpression is an ast_type_specifier.

+    * 2. methods - Only the .length() method of array types.

+    * 3. functions - Calls to regular old functions.

+    *

+    * Method calls are actually detected when the ast_field_selection

+    * expression is handled.

+    */

+   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 = type->glsl_type(& name, state);

+

+

+      /* Constructors for samplers are illegal.

+       */

+      if (constructor_type->is_sampler()) {

+	 _mesa_glsl_error(& loc, state, "cannot construct sampler type `%s'",

+			  constructor_type->name);

+	 return ir_call::get_error_instruction(ctx);

+      }

+

+      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(ctx);

+	 }

+

+	 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

+       * requirement is that the parameters must provide enough values of the

+       * correct scalar type.  Constructors for arrays and structures must

+       * have the exact number of parameters with matching types in the

+       * correct order.  These constructors follow essentially the same type

+       * matching rules as functions.

+       */

+      if (!constructor_type->is_numeric() && !constructor_type->is_boolean())

+	 return ir_call::get_error_instruction(ctx);

+

+      /* 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;

+

+      foreach_list (n, &this->expressions) {

+	 ast_node *ast = exec_node_data(ast_node, n, link);

+	 ir_rvalue *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(ctx);

+	 }

+

+	 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(ctx);

+	 }

+

+	 /* 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++;

+

+	 actual_parameters.push_tail(result);

+	 components_used += result->type->components();

+      }

+

+      /* 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(ctx);

+      }

+

+      /* 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(ctx);

+      }

+

+      /* 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

+	  && matrix_parameters == 0) {

+	 _mesa_glsl_error(& loc, state, "too few components to construct "

+			  "`%s'",

+			  constructor_type->name);

+	 return ir_call::get_error_instruction(ctx);

+      }

+

+      /* Later, we cast each parameter to the same base type as the

+       * constructor.  Since there are no non-floating point matrices, we

+       * need to break them up into a series of column vectors.

+       */

+      if (constructor_type->base_type != GLSL_TYPE_FLOAT) {

+	 foreach_list_safe(n, &actual_parameters) {

+	    ir_rvalue *matrix = (ir_rvalue *) n;

+

+	    if (!matrix->type->is_matrix())

+	       continue;

+

+	    /* Create a temporary containing the matrix. */

+	    ir_variable *var = new(ctx) ir_variable(matrix->type, "matrix_tmp",

+						    ir_var_temporary);

+	    instructions->push_tail(var);

+	    instructions->push_tail(new(ctx) ir_assignment(new(ctx)

+	       ir_dereference_variable(var), matrix, NULL));

+	    var->constant_value = matrix->constant_expression_value();

+

+	    /* Replace the matrix with dereferences of its columns. */

+	    for (int i = 0; i < matrix->type->matrix_columns; i++) {

+	       matrix->insert_before(new (ctx) ir_dereference_array(var,

+		  new(ctx) ir_constant(i)));

+	    }

+	    matrix->remove();

+	 }

+      }

+

+      bool all_parameters_are_constant = true;

+

+      /* Type cast each parameter and, if possible, fold constants.*/

+      foreach_list_safe(n, &actual_parameters) {

+	 ir_rvalue *ir = (ir_rvalue *) n;

+

+	 const glsl_type *desired_type =

+	    glsl_type::get_instance(constructor_type->base_type,

+				    ir->type->vector_elements,

+				    ir->type->matrix_columns);

+	 ir_rvalue *result = convert_component(ir, desired_type);

+

+	 /* Attempt to convert the parameter to a constant valued expression.

+	  * After doing so, track whether or not all the parameters to the

+	  * constructor are trivially constant valued expressions.

+	  */

+	 ir_rvalue *const constant = result->constant_expression_value();

+

+	 if (constant != NULL)

+	    result = constant;

+	 else

+	    all_parameters_are_constant = false;

+

+	 if (result != ir) {

+	    ir->replace_with(result);

+	 }

+      }

+

+      /* If all of the parameters are trivially constant, create a

+       * constant representing the complete collection of parameters.

+       */

+      if (all_parameters_are_constant) {

+	 return new(ctx) ir_constant(constructor_type, &actual_parameters);

+      } else if (constructor_type->is_scalar()) {

+	 return dereference_component((ir_rvalue *) actual_parameters.head,

+				      0);

+      } else if (constructor_type->is_vector()) {

+	 return emit_inline_vector_constructor(constructor_type,

+					       instructions,

+					       &actual_parameters,

+					       ctx);

+      } else {

+	 assert(constructor_type->is_matrix());

+	 return emit_inline_matrix_constructor(constructor_type,

+					       instructions,

+					       &actual_parameters,

+					       ctx);

+      }

+   } else {

+      const ast_expression *id = subexpressions[0];

+      YYLTYPE loc = id->get_location();

+      exec_list actual_parameters;

+

+      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);

+   }

+

+   return ir_call::get_error_instruction(ctx);

+}