mirror of https://gitlab.freedesktop.org/mesa/mesa
243 lines
7.2 KiB
C++
243 lines
7.2 KiB
C++
/*
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* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <string.h>
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#include "main/imports.h"
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#include "main/simple_list.h"
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#include "ir.h"
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#include "glsl_types.h"
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ir_assignment::ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs,
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ir_rvalue *condition)
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: ir_rvalue()
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{
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this->lhs = lhs;
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this->rhs = rhs;
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this->condition = condition;
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}
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ir_expression::ir_expression(int op, const struct glsl_type *type,
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ir_rvalue *op0, ir_rvalue *op1)
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: ir_rvalue()
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{
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this->type = type;
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this->operation = ir_expression_operation(op);
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this->operands[0] = op0;
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this->operands[1] = op1;
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}
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ir_label::ir_label(const char *label)
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: ir_instruction(), label(label)
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{
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/* empty */
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}
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ir_constant::ir_constant(const struct glsl_type *type, const void *data)
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: ir_rvalue()
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{
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const unsigned elements =
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((type->vector_elements == 0) ? 1 : type->vector_elements)
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* ((type->matrix_columns == 0) ? 1 : type->matrix_columns);
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unsigned size = 0;
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this->type = type;
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switch (type->base_type) {
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case GLSL_TYPE_UINT: size = sizeof(this->value.u[0]); break;
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case GLSL_TYPE_INT: size = sizeof(this->value.i[0]); break;
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case GLSL_TYPE_FLOAT: size = sizeof(this->value.f[0]); break;
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case GLSL_TYPE_BOOL: size = sizeof(this->value.b[0]); break;
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default:
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/* FINISHME: What to do? Exceptions are not the answer.
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*/
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break;
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}
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memcpy(& this->value, data, size * elements);
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}
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ir_dereference::ir_dereference(ir_instruction *var)
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: ir_rvalue()
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{
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this->mode = ir_reference_variable;
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this->var = var;
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this->type = (var != NULL) ? var->type : glsl_type::error_type;
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}
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ir_dereference::ir_dereference(ir_instruction *var,
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ir_rvalue *array_index)
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: ir_rvalue(), mode(ir_reference_array),
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var(var)
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{
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this->type = (var != NULL) ? var->type : glsl_type::error_type;
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this->selector.array_index = array_index;
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}
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ir_swizzle::ir_swizzle(ir_rvalue *val, unsigned x, unsigned y, unsigned z,
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unsigned w, unsigned count)
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: val(val)
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{
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assert((count >= 1) && (count <= 4));
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const unsigned dup_mask = 0
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| ((count > 1) ? ((1U << y) & ((1U << x) )) : 0)
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| ((count > 2) ? ((1U << z) & ((1U << x) | (1U << y) )) : 0)
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| ((count > 3) ? ((1U << w) & ((1U << x) | (1U << y) | (1U << z))) : 0);
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assert(x <= 3);
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assert(y <= 3);
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assert(z <= 3);
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assert(w <= 3);
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mask.x = x;
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mask.y = y;
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mask.z = z;
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mask.w = w;
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mask.num_components = count;
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mask.has_duplicates = dup_mask != 0;
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/* Based on the number of elements in the swizzle and the base type
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* (i.e., float, int, unsigned, or bool) of the vector being swizzled,
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* generate the type of the resulting value.
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*/
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type = glsl_type::get_instance(val->type->base_type, mask.num_components, 1);
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}
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#define X 1
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#define R 5
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#define S 9
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#define I 13
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ir_swizzle *
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ir_swizzle::create(ir_rvalue *val, const char *str, unsigned vector_length)
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{
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/* For each possible swizzle character, this table encodes the value in
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* \c idx_map that represents the 0th element of the vector. For invalid
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* swizzle characters (e.g., 'k'), a special value is used that will allow
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* detection of errors.
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*/
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static const unsigned char base_idx[26] = {
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/* a b c d e f g h i j k l m */
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R, R, I, I, I, I, R, I, I, I, I, I, I,
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/* n o p q r s t u v w x y z */
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I, I, S, S, R, S, S, I, I, X, X, X, X
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};
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/* Each valid swizzle character has an entry in the previous table. This
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* table encodes the base index encoded in the previous table plus the actual
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* index of the swizzle character. When processing swizzles, the first
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* character in the string is indexed in the previous table. Each character
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* in the string is indexed in this table, and the value found there has the
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* value form the first table subtracted. The result must be on the range
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* [0,3].
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*
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* For example, the string "wzyx" will get X from the first table. Each of
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* the charcaters will get X+3, X+2, X+1, and X+0 from this table. After
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* subtraction, the swizzle values are { 3, 2, 1, 0 }.
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*
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* The string "wzrg" will get X from the first table. Each of the characters
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* will get X+3, X+2, R+0, and R+1 from this table. After subtraction, the
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* swizzle values are { 3, 2, 4, 5 }. Since 4 and 5 are outside the range
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* [0,3], the error is detected.
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*/
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static const unsigned char idx_map[26] = {
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/* a b c d e f g h i j k l m */
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R+3, R+2, 0, 0, 0, 0, R+1, 0, 0, 0, 0, 0, 0,
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/* n o p q r s t u v w x y z */
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0, 0, S+2, S+3, R+0, S+0, S+1, 0, 0, X+3, X+0, X+1, X+2
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};
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int swiz_idx[4] = { 0, 0, 0, 0 };
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unsigned i;
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/* Validate the first character in the swizzle string and look up the base
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* index value as described above.
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*/
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if ((str[0] < 'a') || (str[0] > 'z'))
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return NULL;
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const unsigned base = base_idx[str[0] - 'a'];
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for (i = 0; (i < 4) && (str[i] != '\0'); i++) {
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/* Validate the next character, and, as described above, convert it to a
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* swizzle index.
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*/
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if ((str[i] < 'a') || (str[i] > 'z'))
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return NULL;
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swiz_idx[i] = idx_map[str[i] - 'a'] - base;
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if ((swiz_idx[i] < 0) || (swiz_idx[i] >= (int) vector_length))
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return NULL;
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}
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if (str[i] != '\0')
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return NULL;
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return new ir_swizzle(val, swiz_idx[0], swiz_idx[1], swiz_idx[2],
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swiz_idx[3], i);
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}
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#undef X
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#undef R
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#undef S
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#undef I
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ir_variable::ir_variable(const struct glsl_type *type, const char *name)
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: ir_instruction(), read_only(false), centroid(false), invariant(false),
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mode(ir_var_auto), interpolation(ir_var_smooth)
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{
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this->type = type;
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this->name = name;
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}
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ir_function_signature::ir_function_signature(const glsl_type *return_type)
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: ir_instruction(), return_type(return_type), definition(NULL)
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{
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/* empty */
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}
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ir_function::ir_function(const char *name)
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: ir_instruction(), name(name)
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{
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/* empty */
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}
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ir_call *
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ir_call::get_error_instruction()
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{
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ir_call *call = new ir_call;
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call->type = glsl_type::error_type;
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return call;
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}
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