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4358 | Serge | 1 | /* |
2 | * Copyright © 2013 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 "link_uniform_block_active_visitor.h" |
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25 | #include "program.h" |
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26 | |||
27 | link_uniform_block_active * |
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28 | process_block(void *mem_ctx, struct hash_table *ht, ir_variable *var) |
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29 | { |
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30 | const uint32_t h = _mesa_hash_string(var->interface_type->name); |
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31 | const hash_entry *const existing_block = |
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32 | _mesa_hash_table_search(ht, h, var->interface_type->name); |
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33 | |||
34 | const glsl_type *const block_type = var->is_interface_instance() |
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35 | ? var->type : var->interface_type; |
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36 | |||
37 | |||
38 | /* If a block with this block-name has not previously been seen, add it. |
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39 | * If a block with this block-name has been seen, it must be identical to |
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40 | * the block currently being examined. |
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41 | */ |
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42 | if (existing_block == NULL) { |
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43 | link_uniform_block_active *const b = |
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44 | rzalloc(mem_ctx, struct link_uniform_block_active); |
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45 | |||
46 | b->type = block_type; |
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47 | b->has_instance_name = var->is_interface_instance(); |
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48 | |||
49 | _mesa_hash_table_insert(ht, h, var->interface_type->name, |
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50 | (void *) b); |
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51 | return b; |
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52 | } else { |
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53 | link_uniform_block_active *const b = |
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54 | (link_uniform_block_active *) existing_block->data; |
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55 | |||
56 | if (b->type != block_type |
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57 | || b->has_instance_name != var->is_interface_instance()) |
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58 | return NULL; |
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59 | else |
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60 | return b; |
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61 | } |
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62 | |||
63 | assert(!"Should not get here."); |
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64 | return NULL; |
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65 | } |
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66 | |||
67 | ir_visitor_status |
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68 | link_uniform_block_active_visitor::visit_enter(ir_dereference_array *ir) |
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69 | { |
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70 | ir_dereference_variable *const d = ir->array->as_dereference_variable(); |
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71 | ir_variable *const var = (d == NULL) ? NULL : d->var; |
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72 | |||
73 | /* If the r-value being dereferenced is not a variable (e.g., a field of a |
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74 | * structure) or is not a uniform block instance, continue. |
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75 | * |
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76 | * WARNING: It is not enough for the variable to be part of uniform block. |
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77 | * It must represent the entire block. Arrays (or matrices) inside blocks |
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78 | * that lack an instance name are handled by the ir_dereference_variable |
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79 | * function. |
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80 | */ |
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81 | if (var == NULL |
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82 | || !var->is_in_uniform_block() |
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83 | || !var->is_interface_instance()) |
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84 | return visit_continue; |
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85 | |||
86 | /* Process the block. Bail if there was an error. |
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87 | */ |
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88 | link_uniform_block_active *const b = |
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89 | process_block(this->mem_ctx, this->ht, var); |
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90 | if (b == NULL) { |
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91 | linker_error(prog, |
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92 | "uniform block `%s' has mismatching definitions", |
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93 | var->interface_type->name); |
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94 | this->success = false; |
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95 | return visit_stop; |
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96 | } |
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97 | |||
98 | /* Block arrays must be declared with an instance name. |
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99 | */ |
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100 | assert(b->has_instance_name); |
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101 | assert((b->num_array_elements == 0) == (b->array_elements == NULL)); |
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102 | assert(b->type != NULL); |
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103 | |||
104 | /* Determine whether or not this array index has already been added to the |
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105 | * list of active array indices. At this point all constant folding must |
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106 | * have occured, and the array index must be a constant. |
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107 | */ |
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108 | ir_constant *c = ir->array_index->as_constant(); |
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109 | assert(c != NULL); |
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110 | |||
111 | const unsigned idx = c->get_uint_component(0); |
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112 | |||
113 | unsigned i; |
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114 | for (i = 0; i < b->num_array_elements; i++) { |
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115 | if (b->array_elements[i] == idx) |
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116 | break; |
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117 | } |
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118 | |||
119 | assert(i <= b->num_array_elements); |
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120 | |||
121 | if (i == b->num_array_elements) { |
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122 | b->array_elements = reralloc(this->mem_ctx, |
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123 | b->array_elements, |
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124 | unsigned, |
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125 | b->num_array_elements + 1); |
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126 | |||
127 | b->array_elements[b->num_array_elements] = idx; |
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128 | |||
129 | b->num_array_elements++; |
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130 | } |
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131 | |||
132 | return visit_continue_with_parent; |
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133 | } |
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134 | |||
135 | ir_visitor_status |
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136 | link_uniform_block_active_visitor::visit(ir_dereference_variable *ir) |
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137 | { |
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138 | ir_variable *var = ir->var; |
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139 | |||
140 | if (!var->is_in_uniform_block()) |
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141 | return visit_continue; |
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142 | |||
143 | assert(!var->is_interface_instance() || !var->type->is_array()); |
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144 | |||
145 | /* Process the block. Bail if there was an error. |
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146 | */ |
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147 | link_uniform_block_active *const b = |
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148 | process_block(this->mem_ctx, this->ht, var); |
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149 | if (b == NULL) { |
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150 | linker_error(this->prog, |
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151 | "uniform block `%s' has mismatching definitions", |
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152 | var->interface_type->name); |
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153 | this->success = false; |
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154 | return visit_stop; |
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155 | } |
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156 | |||
157 | assert(b->num_array_elements == 0); |
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158 | assert(b->array_elements == NULL); |
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159 | assert(b->type != NULL); |
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160 | |||
161 | return visit_continue; |
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162 | }=>> |