| /* |
| * 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 "glsl_types.h" |
| #include "ir.h" |
| |
| int |
| type_compare(const glsl_type *a, const glsl_type *b) |
| { |
| /* If the types are the same, they trivially match. |
| */ |
| if (a == b) |
| return 0; |
| |
| switch (a->base_type) { |
| case GLSL_TYPE_UINT: |
| case GLSL_TYPE_INT: |
| case GLSL_TYPE_BOOL: |
| /* There is no implicit conversion to or from integer types or bool. |
| */ |
| if ((a->is_integer() != b->is_integer()) |
| || (a->is_boolean() != b->is_boolean())) |
| return -1; |
| |
| /* FALLTHROUGH */ |
| |
| case GLSL_TYPE_FLOAT: |
| if ((a->vector_elements != b->vector_elements) |
| || (a->matrix_columns != b->matrix_columns)) |
| return -1; |
| |
| return 1; |
| |
| case GLSL_TYPE_SAMPLER: |
| case GLSL_TYPE_STRUCT: |
| /* Samplers and structures must match exactly. |
| */ |
| return -1; |
| |
| case GLSL_TYPE_ARRAY: |
| if ((b->base_type != GLSL_TYPE_ARRAY) |
| || (a->length != b->length)) |
| return -1; |
| |
| /* From GLSL 1.50 spec, page 27 (page 33 of the PDF): |
| * "There are no implicit array or structure conversions." |
| * |
| * If the comparison of the array element types detects that a conversion |
| * would be required, the array types do not match. |
| */ |
| return (type_compare(a->fields.array, b->fields.array) == 0) ? 0 : -1; |
| |
| case GLSL_TYPE_FUNCTION: |
| case GLSL_TYPE_VOID: |
| case GLSL_TYPE_ERROR: |
| default: |
| /* These are all error conditions. It is invalid for a parameter to |
| * a function to be declared as error, void, or a function. |
| */ |
| return -1; |
| } |
| |
| /* This point should be unreachable. |
| */ |
| assert(0); |
| } |
| |
| |
| static int |
| parameter_lists_match(exec_list *list_a, exec_list *list_b) |
| { |
| exec_list_iterator iter_a = list_a->iterator(); |
| exec_list_iterator iter_b = list_b->iterator(); |
| int total_score = 0; |
| |
| for (/* empty */ ; iter_a.has_next(); iter_a.next(), iter_b.next()) { |
| /* If all of the parameters from the other parameter list have been |
| * exhausted, the lists have different length and, by definition, |
| * do not match. |
| */ |
| if (!iter_b.has_next()) |
| return -1; |
| |
| |
| const ir_variable *const param = (ir_variable *) iter_a.get(); |
| const ir_instruction *const actual = (ir_instruction *) iter_b.get(); |
| |
| /* Determine whether or not the types match. If the types are an |
| * exact match, the match score is zero. If the types don't match |
| * but the actual parameter can be coerced to the type of the declared |
| * parameter, the match score is one. |
| */ |
| int score; |
| switch ((enum ir_variable_mode)(param->mode)) { |
| case ir_var_auto: |
| case ir_var_uniform: |
| /* These are all error conditions. It is invalid for a parameter to |
| * a function to be declared as auto (not in, out, or inout) or |
| * as uniform. |
| */ |
| assert(0); |
| return -1; |
| |
| case ir_var_in: |
| score = type_compare(param->type, actual->type); |
| break; |
| |
| case ir_var_out: |
| score = type_compare(actual->type, param->type); |
| break; |
| |
| case ir_var_inout: |
| /* Since there are no bi-directional automatic conversions (e.g., |
| * there is int -> float but no float -> int), inout parameters must |
| * be exact matches. |
| */ |
| score = (type_compare(actual->type, param->type) == 0) ? 0 : -1; |
| break; |
| } |
| |
| if (score < 0) |
| return -1; |
| |
| total_score += score; |
| } |
| |
| /* If all of the parameters from the other parameter list have been |
| * exhausted, the lists have different length and, by definition, do not |
| * match. |
| */ |
| if (iter_b.has_next()) |
| return -1; |
| |
| return total_score; |
| } |
| |
| |
| const ir_function_signature * |
| ir_function::matching_signature(exec_list *actual_parameters) |
| { |
| ir_function_signature *match = NULL; |
| |
| foreach_iter(exec_list_iterator, iter, signatures) { |
| ir_function_signature *const sig = |
| (ir_function_signature *) iter.get(); |
| |
| const int score = parameter_lists_match(& sig->parameters, |
| actual_parameters); |
| |
| if (score == 0) |
| return sig; |
| |
| if (score > 0) { |
| if (match != NULL) |
| return NULL; |
| |
| match = sig; |
| } |
| } |
| |
| return match; |
| } |
| |
| |
| static bool |
| parameter_lists_match_exact(exec_list *list_a, exec_list *list_b) |
| { |
| exec_list_iterator iter_a = list_a->iterator(); |
| exec_list_iterator iter_b = list_b->iterator(); |
| |
| while (iter_a.has_next() && iter_b.has_next()) { |
| ir_variable *a = (ir_variable *)iter_a.get(); |
| ir_variable *b = (ir_variable *)iter_b.get(); |
| |
| /* If the types of the parameters do not match, the parameters lists |
| * are different. |
| */ |
| if (a->type != b->type) |
| return false; |
| |
| iter_a.next(); |
| iter_b.next(); |
| } |
| |
| /* Unless both lists are exhausted, they differ in length and, by |
| * definition, do not match. |
| */ |
| if (iter_a.has_next() != iter_b.has_next()) |
| return false; |
| |
| return true; |
| } |
| |
| ir_function_signature * |
| ir_function::exact_matching_signature(exec_list *actual_parameters) |
| { |
| foreach_iter(exec_list_iterator, iter, signatures) { |
| ir_function_signature *const sig = |
| (ir_function_signature *) iter.get(); |
| |
| if (parameter_lists_match_exact(&sig->parameters, actual_parameters)) |
| return sig; |
| } |
| return NULL; |
| } |