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Diffstat (limited to 'src/glsl/ir_function.cpp')
| -rw-r--r-- | src/glsl/ir_function.cpp | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/glsl/ir_function.cpp b/src/glsl/ir_function.cpp new file mode 100644 index 00000000000..5db93f67fb8 --- /dev/null +++ b/src/glsl/ir_function.cpp @@ -0,0 +1,225 @@ +/* + * 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; +} |