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| Rev | Author | Line No. | Line |
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| 4358 | Serge | 1 | /* |
| 2 | * Copyright © 2010 Intel Corporation |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 21 | * DEALINGS IN THE SOFTWARE. |
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| 22 | */ |
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| 23 | |||
| 24 | #include "ast.h" |
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| 25 | #include "glsl_types.h" |
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| 26 | #include "ir.h" |
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| 27 | |||
| 28 | ir_rvalue * |
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| 29 | _mesa_ast_array_index_to_hir(void *mem_ctx, |
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| 30 | struct _mesa_glsl_parse_state *state, |
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| 31 | ir_rvalue *array, ir_rvalue *idx, |
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| 32 | YYLTYPE &loc, YYLTYPE &idx_loc) |
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| 33 | { |
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| 34 | if (!array->type->is_error() |
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| 35 | && !array->type->is_array() |
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| 36 | && !array->type->is_matrix() |
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| 37 | && !array->type->is_vector()) { |
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| 38 | _mesa_glsl_error(& idx_loc, state, |
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| 39 | "cannot dereference non-array / non-matrix / " |
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| 40 | "non-vector"); |
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| 41 | } |
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| 42 | |||
| 43 | if (!idx->type->is_error()) { |
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| 44 | if (!idx->type->is_integer()) { |
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| 45 | _mesa_glsl_error(& idx_loc, state, "array index must be integer type"); |
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| 46 | } else if (!idx->type->is_scalar()) { |
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| 47 | _mesa_glsl_error(& idx_loc, state, "array index must be scalar"); |
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| 48 | } |
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| 49 | } |
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| 50 | |||
| 51 | /* If the array index is a constant expression and the array has a |
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| 52 | * declared size, ensure that the access is in-bounds. If the array |
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| 53 | * index is not a constant expression, ensure that the array has a |
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| 54 | * declared size. |
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| 55 | */ |
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| 56 | ir_constant *const const_index = idx->constant_expression_value(); |
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| 57 | if (const_index != NULL && idx->type->is_integer()) { |
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| 58 | const int idx = const_index->value.i[0]; |
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| 59 | const char *type_name = "error"; |
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| 60 | unsigned bound = 0; |
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| 61 | |||
| 62 | /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec: |
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| 63 | * |
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| 64 | * "It is illegal to declare an array with a size, and then |
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| 65 | * later (in the same shader) index the same array with an |
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| 66 | * integral constant expression greater than or equal to the |
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| 67 | * declared size. It is also illegal to index an array with a |
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| 68 | * negative constant expression." |
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| 69 | */ |
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| 70 | if (array->type->is_matrix()) { |
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| 71 | if (array->type->row_type()->vector_elements <= idx) { |
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| 72 | type_name = "matrix"; |
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| 73 | bound = array->type->row_type()->vector_elements; |
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| 74 | } |
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| 75 | } else if (array->type->is_vector()) { |
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| 76 | if (array->type->vector_elements <= idx) { |
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| 77 | type_name = "vector"; |
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| 78 | bound = array->type->vector_elements; |
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| 79 | } |
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| 80 | } else { |
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| 81 | /* glsl_type::array_size() returns 0 for non-array types. This means |
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| 82 | * that we don't need to verify that the type is an array before |
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| 83 | * doing the bounds checking. |
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| 84 | */ |
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| 85 | if ((array->type->array_size() > 0) |
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| 86 | && (array->type->array_size() <= idx)) { |
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| 87 | type_name = "array"; |
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| 88 | bound = array->type->array_size(); |
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| 89 | } |
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| 90 | } |
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| 91 | |||
| 92 | if (bound > 0) { |
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| 93 | _mesa_glsl_error(& loc, state, "%s index must be < %u", |
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| 94 | type_name, bound); |
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| 95 | } else if (idx < 0) { |
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| 96 | _mesa_glsl_error(& loc, state, "%s index must be >= 0", |
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| 97 | type_name); |
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| 98 | } |
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| 99 | |||
| 100 | if (array->type->is_array()) { |
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| 101 | /* If the array is a variable dereference, it dereferences the |
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| 102 | * whole array, by definition. Use this to get the variable. |
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| 103 | * |
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| 104 | * FINISHME: Should some methods for getting / setting / testing |
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| 105 | * FINISHME: array access limits be added to ir_dereference? |
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| 106 | */ |
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| 107 | ir_variable *const v = array->whole_variable_referenced(); |
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| 108 | if ((v != NULL) && (unsigned(idx) > v->max_array_access)) { |
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| 109 | v->max_array_access = idx; |
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| 110 | |||
| 111 | /* Check whether this access will, as a side effect, implicitly |
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| 112 | * cause the size of a built-in array to be too large. |
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| 113 | */ |
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| 114 | check_builtin_array_max_size(v->name, idx+1, loc, state); |
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| 115 | } |
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| 116 | } |
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| 117 | } else if (const_index == NULL && array->type->is_array()) { |
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| 118 | if (array->type->array_size() == 0) { |
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| 119 | _mesa_glsl_error(&loc, state, "unsized array index must be constant"); |
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| 120 | } else if (array->type->fields.array->is_interface()) { |
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| 121 | /* Page 46 in section 4.3.7 of the OpenGL ES 3.00 spec says: |
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| 122 | * |
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| 123 | * "All indexes used to index a uniform block array must be |
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| 124 | * constant integral expressions." |
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| 125 | */ |
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| 126 | _mesa_glsl_error(&loc, state, |
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| 127 | "uniform block array index must be constant"); |
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| 128 | } else { |
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| 129 | /* whole_variable_referenced can return NULL if the array is a |
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| 130 | * member of a structure. In this case it is safe to not update |
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| 131 | * the max_array_access field because it is never used for fields |
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| 132 | * of structures. |
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| 133 | */ |
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| 134 | ir_variable *v = array->whole_variable_referenced(); |
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| 135 | if (v != NULL) |
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| 136 | v->max_array_access = array->type->array_size() - 1; |
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| 137 | } |
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| 138 | |||
| 139 | /* From page 23 (29 of the PDF) of the GLSL 1.30 spec: |
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| 140 | * |
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| 141 | * "Samplers aggregated into arrays within a shader (using square |
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| 142 | * brackets [ ]) can only be indexed with integral constant |
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| 143 | * expressions [...]." |
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| 144 | * |
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| 145 | * This restriction was added in GLSL 1.30. Shaders using earlier |
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| 146 | * version of the language should not be rejected by the compiler |
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| 147 | * front-end for using this construct. This allows useful things such |
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| 148 | * as using a loop counter as the index to an array of samplers. If the |
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| 149 | * loop in unrolled, the code should compile correctly. Instead, emit a |
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| 150 | * warning. |
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| 151 | */ |
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| 152 | if (array->type->element_type()->is_sampler()) { |
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| 153 | if (!state->is_version(130, 100)) { |
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| 154 | if (state->es_shader) { |
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| 155 | _mesa_glsl_warning(&loc, state, |
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| 156 | "sampler arrays indexed with non-constant " |
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| 157 | "expressions is optional in %s", |
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| 158 | state->get_version_string()); |
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| 159 | } else { |
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| 160 | _mesa_glsl_warning(&loc, state, |
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| 161 | "sampler arrays indexed with non-constant " |
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| 162 | "expressions will be forbidden in GLSL 1.30 " |
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| 163 | "and later"); |
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| 164 | } |
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| 165 | } else { |
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| 166 | _mesa_glsl_error(&loc, state, |
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| 167 | "sampler arrays indexed with non-constant " |
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| 168 | "expressions is forbidden in GLSL 1.30 and " |
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| 169 | "later"); |
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| 170 | } |
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| 171 | } |
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| 172 | } |
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| 173 | |||
| 174 | /* After performing all of the error checking, generate the IR for the |
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| 175 | * expression. |
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| 176 | */ |
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| 177 | if (array->type->is_array() |
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| 178 | || array->type->is_matrix()) { |
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| 179 | return new(mem_ctx) ir_dereference_array(array, idx); |
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| 180 | } else if (array->type->is_vector()) { |
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| 181 | return new(mem_ctx) ir_expression(ir_binop_vector_extract, array, idx); |
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| 182 | } else if (array->type->is_error()) { |
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| 183 | return array; |
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| 184 | } else { |
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| 185 | ir_rvalue *result = new(mem_ctx) ir_dereference_array(array, idx); |
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| 186 | result->type = glsl_type::error_type; |
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| 187 | |||
| 188 | return result; |
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| 189 | } |
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| 190 | } |