2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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21 * DEALINGS IN THE SOFTWARE.
25 #include "glsl_types.h"
29 _mesa_ast_array_index_to_hir(void *mem_ctx,
30 struct _mesa_glsl_parse_state *state,
31 ir_rvalue *array, ir_rvalue *idx,
32 YYLTYPE &loc, YYLTYPE &idx_loc,
35 ir_rvalue *result = new(mem_ctx) ir_dereference_array(array, idx);
40 if (!array->type->is_array()
41 && !array->type->is_matrix()
42 && !array->type->is_vector()) {
43 _mesa_glsl_error(& idx_loc, state,
44 "cannot dereference non-array / non-matrix / "
49 if (!idx->type->is_integer()) {
50 _mesa_glsl_error(& idx_loc, state,
51 "array index must be integer type");
53 } else if (!idx->type->is_scalar()) {
54 _mesa_glsl_error(& idx_loc, state,
55 "array index must be scalar");
59 /* If the array index is a constant expression and the array has a
60 * declared size, ensure that the access is in-bounds. If the array
61 * index is not a constant expression, ensure that the array has a
64 ir_constant *const const_index = idx->constant_expression_value();
65 if (const_index != NULL) {
66 const int idx = const_index->value.i[0];
67 const char *type_name;
70 if (array->type->is_matrix()) {
72 } else if (array->type->is_vector()) {
78 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
80 * "It is illegal to declare an array with a size, and then
81 * later (in the same shader) index the same array with an
82 * integral constant expression greater than or equal to the
83 * declared size. It is also illegal to index an array with a
84 * negative constant expression."
86 if (array->type->is_matrix()) {
87 if (array->type->row_type()->vector_elements <= idx) {
88 bound = array->type->row_type()->vector_elements;
90 } else if (array->type->is_vector()) {
91 if (array->type->vector_elements <= idx) {
92 bound = array->type->vector_elements;
95 if ((array->type->array_size() > 0)
96 && (array->type->array_size() <= idx)) {
97 bound = array->type->array_size();
102 _mesa_glsl_error(& loc, state, "%s index must be < %u",
104 error_emitted = true;
105 } else if (idx < 0) {
106 _mesa_glsl_error(& loc, state, "%s index must be >= 0",
108 error_emitted = true;
111 if (array->type->is_array()) {
112 /* If the array is a variable dereference, it dereferences the
113 * whole array, by definition. Use this to get the variable.
115 * FINISHME: Should some methods for getting / setting / testing
116 * FINISHME: array access limits be added to ir_dereference?
118 ir_variable *const v = array->whole_variable_referenced();
119 if ((v != NULL) && (unsigned(idx) > v->max_array_access)) {
120 v->max_array_access = idx;
122 /* Check whether this access will, as a side effect, implicitly
123 * cause the size of a built-in array to be too large.
125 if (check_builtin_array_max_size(v->name, idx+1, loc, state))
126 error_emitted = true;
129 } else if (array->type->array_size() == 0) {
130 _mesa_glsl_error(&loc, state, "unsized array index must be constant");
131 } else if (array->type->is_array()
132 && array->type->fields.array->is_interface()) {
133 /* Page 46 in section 4.3.7 of the OpenGL ES 3.00 spec says:
135 * "All indexes used to index a uniform block array must be
136 * constant integral expressions."
138 _mesa_glsl_error(&loc, state,
139 "uniform block array index must be constant");
141 if (array->type->is_array()) {
142 /* whole_variable_referenced can return NULL if the array is a
143 * member of a structure. In this case it is safe to not update
144 * the max_array_access field because it is never used for fields
147 ir_variable *v = array->whole_variable_referenced();
149 v->max_array_access = array->type->array_size() - 1;
153 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
155 * "Samplers aggregated into arrays within a shader (using square
156 * brackets [ ]) can only be indexed with integral constant
157 * expressions [...]."
159 * This restriction was added in GLSL 1.30. Shaders using earlier version
160 * of the language should not be rejected by the compiler front-end for
161 * using this construct. This allows useful things such as using a loop
162 * counter as the index to an array of samplers. If the loop in unrolled,
163 * the code should compile correctly. Instead, emit a warning.
165 if (array->type->is_array() &&
166 array->type->element_type()->is_sampler() &&
167 const_index == NULL) {
169 if (!state->is_version(130, 100)) {
170 if (state->es_shader) {
171 _mesa_glsl_warning(&loc, state,
172 "sampler arrays indexed with non-constant "
173 "expressions is optional in %s",
174 state->get_version_string());
176 _mesa_glsl_warning(&loc, state,
177 "sampler arrays indexed with non-constant "
178 "expressions will be forbidden in GLSL 1.30 and "
182 _mesa_glsl_error(&loc, state,
183 "sampler arrays indexed with non-constant "
184 "expressions is forbidden in GLSL 1.30 and "
186 error_emitted = true;
191 result->type = glsl_type::error_type;