| /* |
| * 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 "compiler/glsl_types.h" |
| #include "ir.h" |
| |
| void |
| ast_array_specifier::print(void) const |
| { |
| foreach_list_typed (ast_node, array_dimension, link, &this->array_dimensions) { |
| printf("[ "); |
| if (((ast_expression*)array_dimension)->oper != ast_unsized_array_dim) |
| 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, int 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 > (int)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 three 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]). |
| * |
| * - Accessing an element of an array that is a member of a named |
| * interface block array of arrays (e.g. ifc[j][k].foo[i]). |
| */ |
| ir_dereference_variable *deref_var = |
| deref_record->record->as_dereference_variable(); |
| if (deref_var == NULL) { |
| ir_dereference_array *deref_array = |
| deref_record->record->as_dereference_array(); |
| ir_dereference_array *deref_array_prev = NULL; |
| while (deref_array != NULL) { |
| deref_array_prev = deref_array; |
| deref_array = deref_array->array->as_dereference_array(); |
| } |
| if (deref_array_prev != NULL) |
| deref_var = deref_array_prev->array->as_dereference_variable(); |
| } |
| |
| if (deref_var != NULL) { |
| if (deref_var->var->is_interface_instance()) { |
| unsigned field_idx = deref_record->field_idx; |
| assert(field_idx < deref_var->var->get_interface_type()->length); |
| |
| int *const max_ifc_array_access = |
| deref_var->var->get_max_ifc_array_access(); |
| |
| assert(max_ifc_array_access != NULL); |
| |
| if (idx > max_ifc_array_access[field_idx]) { |
| max_ifc_array_access[field_idx] = idx; |
| |
| /* Check whether this access will, as a side effect, implicitly |
| * cause the size of a built-in array to be too large. |
| */ |
| const char *field_name = |
| deref_record->record->type->fields.structure[field_idx].name; |
| check_builtin_array_max_size(field_name, idx+1, *loc, state); |
| } |
| } |
| } |
| } |
| } |
| |
| |
| static int |
| get_implicit_array_size(struct _mesa_glsl_parse_state *state, |
| ir_rvalue *array) |
| { |
| ir_variable *var = array->variable_referenced(); |
| |
| /* Inputs in control shader are implicitly sized |
| * to the maximum patch size. |
| */ |
| if (state->stage == MESA_SHADER_TESS_CTRL && |
| var->data.mode == ir_var_shader_in) { |
| return state->Const.MaxPatchVertices; |
| } |
| |
| /* Non-patch inputs in evaluation shader are implicitly sized |
| * to the maximum patch size. |
| */ |
| if (state->stage == MESA_SHADER_TESS_EVAL && |
| var->data.mode == ir_var_shader_in && |
| !var->data.patch) { |
| return state->Const.MaxPatchVertices; |
| } |
| |
| return 0; |
| } |
| |
| |
| 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_32()) { |
| _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(mem_ctx); |
| if (const_index != NULL && idx->type->is_integer_32()) { |
| 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()) { |
| int implicit_size = get_implicit_array_size(state, array); |
| if (implicit_size) { |
| ir_variable *v = array->whole_variable_referenced(); |
| if (v != NULL) |
| v->data.max_array_access = implicit_size - 1; |
| } |
| else if (state->stage == MESA_SHADER_TESS_CTRL && |
| array->variable_referenced()->data.mode == ir_var_shader_out && |
| !array->variable_referenced()->data.patch) { |
| /* Tessellation control shader output non-patch arrays are |
| * initially unsized. Despite that, they are allowed to be |
| * indexed with a non-constant expression (typically |
| * "gl_InvocationID"). The array size will be determined |
| * by the linker. |
| */ |
| } |
| else if (array->variable_referenced()->data.mode != |
| ir_var_shader_storage) { |
| _mesa_glsl_error(&loc, state, "unsized array index must be constant"); |
| } else { |
| /* Unsized array non-constant indexing on SSBO is allowed only for |
| * the last member of the SSBO definition. |
| */ |
| ir_variable *var = array->variable_referenced(); |
| const glsl_type *iface_type = var->get_interface_type(); |
| int field_index = iface_type->field_index(var->name); |
| /* Field index can be < 0 for instance arrays */ |
| if (field_index >= 0 && |
| field_index != (int) iface_type->length - 1) { |
| _mesa_glsl_error(&loc, state, "Indirect access on unsized " |
| "array is limited to the last member of " |
| "SSBO."); |
| } |
| } |
| } else if (array->type->without_array()->is_interface() |
| && ((array->variable_referenced()->data.mode == ir_var_uniform |
| && !state->is_version(400, 320) |
| && !state->ARB_gpu_shader5_enable |
| && !state->EXT_gpu_shader5_enable |
| && !state->OES_gpu_shader5_enable) || |
| (array->variable_referenced()->data.mode == ir_var_shader_storage |
| && !state->is_version(400, 0) |
| && !state->ARB_gpu_shader5_enable))) { |
| /* Page 50 in section 4.3.9 of the OpenGL ES 3.10 spec says: |
| * |
| * "All indices used to index a uniform or shader storage block |
| * array must be constant integral expressions." |
| * |
| * But OES_gpu_shader5 (and ESSL 3.20) relax this to allow indexing |
| * on uniform blocks but not shader storage blocks. |
| * |
| */ |
| _mesa_glsl_error(&loc, state, "%s block array index must be constant", |
| array->variable_referenced()->data.mode |
| == ir_var_uniform ? "uniform" : "shader storage"); |
| } 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. |
| * |
| * In GLSL 4.00 / ARB_gpu_shader5, this requirement is relaxed again to allow |
| * indexing with dynamically uniform expressions. Note that these are not |
| * required to be uniforms or expressions based on them, but merely that the |
| * values must not diverge between shader invocations run together. If the |
| * values *do* diverge, then the behavior of the operation requiring a |
| * dynamically uniform expression is undefined. |
| * |
| * From section 4.1.7 of the ARB_bindless_texture spec: |
| * |
| * "Samplers aggregated into arrays within a shader (using square |
| * brackets []) can be indexed with arbitrary integer expressions." |
| */ |
| if (array->type->without_array()->is_sampler()) { |
| if (!state->is_version(400, 320) && |
| !state->ARB_gpu_shader5_enable && |
| !state->EXT_gpu_shader5_enable && |
| !state->OES_gpu_shader5_enable && |
| !state->has_bindless()) { |
| if (state->is_version(130, 300)) |
| _mesa_glsl_error(&loc, state, |
| "sampler arrays indexed with non-constant " |
| "expressions are forbidden in GLSL %s " |
| "and later", |
| state->es_shader ? "ES 3.00" : "1.30"); |
| else if (state->es_shader) |
| _mesa_glsl_warning(&loc, state, |
| "sampler arrays indexed with non-constant " |
| "expressions will be forbidden in GLSL " |
| "3.00 and later"); |
| else |
| _mesa_glsl_warning(&loc, state, |
| "sampler arrays indexed with non-constant " |
| "expressions will be forbidden in GLSL " |
| "1.30 and later"); |
| } |
| } |
| |
| /* From page 27 of the GLSL ES 3.1 specification: |
| * |
| * "When aggregated into arrays within a shader, images can only be |
| * indexed with a constant integral expression." |
| * |
| * On the other hand the desktop GL specification extension allows |
| * non-constant indexing of image arrays, but behavior is left undefined |
| * in cases where the indexing expression is not dynamically uniform. |
| */ |
| if (state->es_shader && array->type->without_array()->is_image()) { |
| _mesa_glsl_error(&loc, state, |
| "image arrays indexed with non-constant " |
| "expressions are forbidden in GLSL ES."); |
| } |
| } |
| |
| /* After performing all of the error checking, generate the IR for the |
| * expression. |
| */ |
| if (array->type->is_array() |
| || array->type->is_matrix() |
| || array->type->is_vector()) { |
| return new(mem_ctx) ir_dereference_array(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; |
| } |
| } |
