/* * 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 "ast.h" #include "glsl_types.h" #include "ir.h" ir_rvalue * _mesa_ast_array_index_to_hir(void *mem_ctx, struct _mesa_glsl_parse_state *state, ir_rvalue *array, ir_rvalue *idx, YYLTYPE &loc, YYLTYPE &idx_loc, bool error_emitted) { ir_rvalue *result = new(mem_ctx) ir_dereference_array(array, idx); if (error_emitted) return result; if (!array->type->is_array() && !array->type->is_matrix() && !array->type->is_vector()) { _mesa_glsl_error(& idx_loc, state, "cannot dereference non-array / non-matrix / " "non-vector"); result->type = glsl_type::error_type; } if (!idx->type->is_integer()) { _mesa_glsl_error(& idx_loc, state, "array index must be integer type"); } else if (!idx->type->is_scalar()) { _mesa_glsl_error(& idx_loc, state, "array index must be scalar"); } /* If the array index is a constant expression and the array has a * declared size, ensure that the access is in-bounds. If the array * index is not a constant expression, ensure that the array has a * declared size. */ ir_constant *const const_index = idx->constant_expression_value(); if (const_index != NULL) { const int idx = const_index->value.i[0]; const char *type_name; unsigned bound = 0; if (array->type->is_matrix()) { type_name = "matrix"; } else if (array->type->is_vector()) { type_name = "vector"; } else { type_name = "array"; } /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec: * * "It is illegal to declare an array with a size, and then * later (in the same shader) index the same array with an * integral constant expression greater than or equal to the * declared size. It is also illegal to index an array with a * negative constant expression." */ if (array->type->is_matrix()) { if (array->type->row_type()->vector_elements <= idx) { bound = array->type->row_type()->vector_elements; } } else if (array->type->is_vector()) { if (array->type->vector_elements <= idx) { bound = array->type->vector_elements; } } else { if ((array->type->array_size() > 0) && (array->type->array_size() <= idx)) { bound = array->type->array_size(); } } if (bound > 0) { _mesa_glsl_error(& loc, state, "%s index must be < %u", type_name, bound); } else if (idx < 0) { _mesa_glsl_error(& loc, state, "%s index must be >= 0", type_name); } if (array->type->is_array()) { /* If the array is a variable dereference, it dereferences the * whole array, by definition. Use this to get the variable. * * FINISHME: Should some methods for getting / setting / testing * FINISHME: array access limits be added to ir_dereference? */ ir_variable *const v = array->whole_variable_referenced(); if ((v != NULL) && (unsigned(idx) > v->max_array_access)) { v->max_array_access = idx; /* Check whether this access will, as a side effect, implicitly * cause the size of a built-in array to be too large. */ check_builtin_array_max_size(v->name, idx+1, loc, state); } } } else if (array->type->array_size() == 0) { _mesa_glsl_error(&loc, state, "unsized array index must be constant"); } else if (array->type->is_array() && array->type->fields.array->is_interface()) { /* Page 46 in section 4.3.7 of the OpenGL ES 3.00 spec says: * * "All indexes used to index a uniform block array must be * constant integral expressions." */ _mesa_glsl_error(&loc, state, "uniform block array index must be constant"); } else { if (array->type->is_array()) { /* whole_variable_referenced can return NULL if the array is a * member of a structure. In this case it is safe to not update * the max_array_access field because it is never used for fields * of structures. */ ir_variable *v = array->whole_variable_referenced(); if (v != NULL) v->max_array_access = array->type->array_size() - 1; } } /* From page 23 (29 of the PDF) of the GLSL 1.30 spec: * * "Samplers aggregated into arrays within a shader (using square * brackets [ ]) can only be indexed with integral constant * expressions [...]." * * This restriction was added in GLSL 1.30. Shaders using earlier version * of the language should not be rejected by the compiler front-end for * using this construct. This allows useful things such as using a loop * counter as the index to an array of samplers. If the loop in unrolled, * the code should compile correctly. Instead, emit a warning. */ if (array->type->is_array() && array->type->element_type()->is_sampler() && const_index == NULL) { if (!state->is_version(130, 100)) { if (state->es_shader) { _mesa_glsl_warning(&loc, state, "sampler arrays indexed with non-constant " "expressions is optional in %s", state->get_version_string()); } else { _mesa_glsl_warning(&loc, state, "sampler arrays indexed with non-constant " "expressions will be forbidden in GLSL 1.30 and " "later"); } } else { _mesa_glsl_error(&loc, state, "sampler arrays indexed with non-constant " "expressions is forbidden in GLSL 1.30 and " "later"); } } return result; }