| /* |
| * 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" |
| |
| #if defined(NDEBUG) && defined(__GNUC__) |
| #define U_ASSERT_ONLY __attribute__((unused)) |
| #else |
| #define U_ASSERT_ONLY |
| #endif |
| |
| void |
| ast_array_specifier::print(void) const |
| { |
| if (this->is_unsized_array) { |
| printf("[ ] "); |
| } |
| |
| foreach_list_typed (ast_node, array_dimension, link, &this->array_dimensions) { |
| printf("[ "); |
| array_dimension->print(); |
| printf("] "); |
| } |
| } |
| |
| /** |
| * If \c ir is a reference to an array for which we are tracking the max array |
| * element accessed, track that the given element has been accessed. |
| * Otherwise do nothing. |
| * |
| * This function also checks whether the array is a built-in array whose |
| * maximum size is too small to accommodate the given index, and if so uses |
| * loc and state to report the error. |
| */ |
| static void |
| update_max_array_access(ir_rvalue *ir, unsigned idx, YYLTYPE *loc, |
| struct _mesa_glsl_parse_state *state) |
| { |
| if (ir_dereference_variable *deref_var = ir->as_dereference_variable()) { |
| ir_variable *var = deref_var->var; |
| if (idx > var->data.max_array_access) { |
| var->data.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(var->name, idx+1, *loc, state); |
| } |
| } else if (ir_dereference_record *deref_record = |
| ir->as_dereference_record()) { |
| /* There are two possibilities we need to consider: |
| * |
| * - Accessing an element of an array that is a member of a named |
| * interface block (e.g. ifc.foo[i]) |
| * |
| * - Accessing an element of an array that is a member of a named |
| * interface block array (e.g. ifc[j].foo[i]). |
| */ |
| ir_dereference_variable *deref_var = |
| deref_record->record->as_dereference_variable(); |
| if (deref_var == NULL) { |
| if (ir_dereference_array *deref_array = |
| deref_record->record->as_dereference_array()) { |
| deref_var = deref_array->array->as_dereference_variable(); |
| } |
| } |
| |
| if (deref_var != NULL) { |
| if (deref_var->var->is_interface_instance()) { |
| const glsl_type U_ASSERT_ONLY *interface_type = |
| deref_var->var->get_interface_type(); |
| unsigned field_index = |
| deref_record->record->type->field_index(deref_record->field); |
| assert(field_index < interface_type->length); |
| if (idx > deref_var->var->max_ifc_array_access[field_index]) { |
| deref_var->var->max_ifc_array_access[field_index] = 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(deref_record->field, idx+1, *loc, |
| state); |
| } |
| } |
| } |
| } |
| } |
| |
| |
| 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) |
| { |
| if (!array->type->is_error() |
| && !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"); |
| } |
| |
| if (!idx->type->is_error()) { |
| 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 && idx->type->is_integer()) { |
| const int idx = const_index->value.i[0]; |
| const char *type_name = "error"; |
| unsigned bound = 0; |
| |
| /* 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) { |
| type_name = "matrix"; |
| bound = array->type->row_type()->vector_elements; |
| } |
| } else if (array->type->is_vector()) { |
| if (array->type->vector_elements <= idx) { |
| type_name = "vector"; |
| bound = array->type->vector_elements; |
| } |
| } else { |
| /* glsl_type::array_size() returns -1 for non-array types. This means |
| * that we don't need to verify that the type is an array before |
| * doing the bounds checking. |
| */ |
| if ((array->type->array_size() > 0) |
| && (array->type->array_size() <= idx)) { |
| type_name = "array"; |
| 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()) |
| update_max_array_access(array, idx, &loc, state); |
| } else if (const_index == NULL && array->type->is_array()) { |
| if (array->type->is_unsized_array()) { |
| _mesa_glsl_error(&loc, state, "unsized array index must be constant"); |
| } else if (array->type->fields.array->is_interface() |
| && array->variable_referenced()->data.mode == ir_var_uniform) { |
| /* 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 { |
| /* 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->data.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->element_type()->is_sampler()) { |
| 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"); |
| } |
| } |
| } |
| |
| /* After performing all of the error checking, generate the IR for the |
| * expression. |
| */ |
| if (array->type->is_array() |
| || array->type->is_matrix()) { |
| return new(mem_ctx) ir_dereference_array(array, idx); |
| } else if (array->type->is_vector()) { |
| return new(mem_ctx) ir_expression(ir_binop_vector_extract, array, idx); |
| } else if (array->type->is_error()) { |
| return array; |
| } else { |
| ir_rvalue *result = new(mem_ctx) ir_dereference_array(array, idx); |
| result->type = glsl_type::error_type; |
| |
| return result; |
| } |
| } |