mirror of
https://github.com/DarkPlacesEngine/gmqcc.git
synced 2024-11-23 20:33:05 +00:00
339 lines
12 KiB
C
339 lines
12 KiB
C
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/*
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* Copyright (C) 2012, 2013
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* Dale Weiler
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/*
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* Provides all the "intrinsics" / "builtins" for GMQCC. These can do
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* a few things, they can provide fall back implementations for math
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* functions if the definitions don't exist for some given engine. Or
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* then can determine definitions for existing builtins, and simply
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* wrap back to them instead. This is like a "portable" intrface that
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* is entered when -fintrin is used (causing all existing builtins to
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* be ignored by the compiler and instead interface through here.
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*/
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typedef struct {
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ast_expression *(*intrin)(parser_t *);
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const char *name;
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const char *alias;
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} intrin_t;
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ht intrin_intrinsics() {
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static ht intrinsics = NULL;
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if (!intrinsics)
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intrinsics = util_htnew(PARSER_HT_SIZE);
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return intrinsics;
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}
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void intrin_intrinsics_destroy() {
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util_htdel(intrin_intrinsics());
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}
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#define INTRIN_VAL(VALUE, NAME, FUNC, STYPE, VTYPE) \
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do { \
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(VALUE) = ast_value_new ( \
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parser_ctx(parser), \
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"__builtin_" NAME, \
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TYPE_FUNCTION \
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); \
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(VALUE)->expression.next = (ast_expression*)ast_value_new ( \
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parser_ctx(parser), \
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STYPE, \
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VTYPE \
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); \
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(FUNC) = ast_function_new ( \
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parser_ctx(parser), \
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"__builtin_" NAME, \
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(VALUE) \
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); \
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} while (0)
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#define INTRIN_REG(FUNC, VALUE) \
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do { \
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vec_push(parser->functions, (FUNC)); \
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vec_push(parser->globals, (ast_expression*)(VALUE)); \
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} while (0)
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ast_expression *intrin_func (parser_t *parser, const char *name);
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#define QC_M_E 2.71828182845905
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ast_expression *intrin_pow(parser_t *parser) {
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static ast_value *value = NULL;
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if (!value) {
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ast_value *arg1 = ast_value_new(parser_ctx(parser), "x", TYPE_FLOAT);
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ast_value *arg2 = ast_value_new(parser_ctx(parser), "y", TYPE_FLOAT);
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ast_value *local = ast_value_new(parser_ctx(parser), "local", TYPE_FLOAT);
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ast_block *body = ast_block_new(parser_ctx(parser));
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ast_block *l1b = ast_block_new(parser_ctx(parser)); /* loop 1 body */
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ast_block *l2b = ast_block_new(parser_ctx(parser)); /* looo 2 body */
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ast_loop *loop1 = NULL;
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ast_loop *loop2 = NULL;
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ast_function *func = NULL;
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INTRIN_VAL(value, "pow", func, "<float>", TYPE_FLOAT);
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/* arguments */
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vec_push(value->expression.params, arg1);
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vec_push(value->expression.params, arg2);
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/* local */
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vec_push(body->locals, local);
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/* assignment to local of value 1.0f */
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vec_push(body->exprs,
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(ast_expression*)ast_store_new (
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parser_ctx(parser),
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INSTR_STORE_F,
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(ast_expression*)local,
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(ast_expression*)parser_const_float_1(parser)
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)
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);
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/* y >>= 2 */
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vec_push(l2b->exprs,
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(ast_expression*)ast_binstore_new (
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parser_ctx(parser),
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INSTR_STORE_F,
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INSTR_MUL_F,
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(ast_expression*)arg2,
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(ast_expression*)parser_const_float(parser, 0.25f)
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)
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);
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/* x *= x */
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vec_push(l2b->exprs,
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(ast_expression*)ast_binstore_new (
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parser_ctx(parser),
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INSTR_STORE_F,
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INSTR_MUL_F,
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(ast_expression*)arg1,
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(ast_expression*)arg1
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)
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);
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/* while (!(y&1)) */
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loop2 = ast_loop_new (
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parser_ctx(parser),
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NULL,
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(ast_expression*)ast_binary_new (
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parser_ctx(parser),
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INSTR_AND,
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(ast_expression*)arg2,
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(ast_expression*)parser_const_float_1(parser)
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),
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true, /* ! not */
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NULL,
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false,
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NULL,
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(ast_expression*)l2b
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);
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/* push nested loop into loop expressions */
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vec_push(l1b->exprs, (ast_expression*)loop2);
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/* y-- */
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vec_push(l1b->exprs,
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(ast_expression*)ast_binstore_new (
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parser_ctx(parser),
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INSTR_STORE_F,
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INSTR_SUB_F,
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(ast_expression*)arg2,
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(ast_expression*)parser_const_float_1(parser)
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)
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);
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/* local *= x */
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vec_push(l1b->exprs,
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(ast_expression*)ast_binstore_new (
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parser_ctx(parser),
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INSTR_STORE_F,
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INSTR_MUL_F,
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(ast_expression*)local,
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(ast_expression*)arg1
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)
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);
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/* while (y > 0) */
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loop1 = ast_loop_new (
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parser_ctx(parser),
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NULL,
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(ast_expression*)ast_binary_new (
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parser_ctx(parser),
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INSTR_GT,
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(ast_expression*)arg2,
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(ast_expression*)parser_const_float_0(parser)
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),
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false,
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NULL,
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false,
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NULL,
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(ast_expression*)l1b
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);
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/* push the loop1 into the body for the function */
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vec_push(body->exprs, (ast_expression*)loop1);
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/* return local; */
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vec_push(body->exprs,
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(ast_expression*)ast_return_new (
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parser_ctx(parser),
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(ast_expression*)local
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)
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);
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/* push block and register intrin for codegen */
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vec_push(func->blocks, body);
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INTRIN_REG(func, value);
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}
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return (ast_expression*)value;
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}
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ast_expression *intrin_mod(parser_t *parser) {
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static ast_value *value = NULL;
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if (!value) {
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ast_call *call = ast_call_new (parser_ctx(parser), intrin_func(parser, "floor"));
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ast_value *arg1 = ast_value_new(parser_ctx(parser), "x", TYPE_FLOAT);
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ast_value *arg2 = ast_value_new(parser_ctx(parser), "y", TYPE_FLOAT);
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ast_block *body = ast_block_new(parser_ctx(parser));
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ast_function *func = NULL;
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INTRIN_VAL(value, "mod", func, "<float>", TYPE_FLOAT);
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/* floor(x/y) */
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vec_push(call->params,
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(ast_expression*)ast_binary_new (
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parser_ctx(parser),
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INSTR_DIV_F,
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(ast_expression*)arg1,
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(ast_expression*)arg2
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)
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);
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vec_push(body->exprs,
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(ast_expression*)ast_return_new(
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parser_ctx(parser),
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(ast_expression*)ast_binary_new(
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parser_ctx(parser),
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INSTR_SUB_F,
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(ast_expression*)arg1,
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(ast_expression*)ast_binary_new(
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parser_ctx(parser),
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INSTR_MUL_F,
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(ast_expression*)arg2,
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(ast_expression*)call
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)
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)
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)
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);
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vec_push(value->expression.params, arg1); /* float x (for param) */
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vec_push(value->expression.params, arg2); /* float y (for param) */
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vec_push(func->blocks, body); /* {{{ body }}} */
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INTRIN_REG(func, value);
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}
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return (ast_expression*)value;
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}
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ast_expression *intrin_exp(parser_t *parser) {
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/*
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* float __builtin_exp(float x) {
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* return __builtin_pow(QC_M_E, x);
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* }
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*/
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static ast_value *value = NULL;
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if (!value) {
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ast_call *call = ast_call_new (parser_ctx(parser), intrin_func(parser, "pow"));
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ast_value *arg1 = ast_value_new (parser_ctx(parser), "x", TYPE_FLOAT);
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ast_block *body = ast_block_new (parser_ctx(parser));
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ast_function *func = NULL;
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INTRIN_VAL(value, "exp", func, "<float>", TYPE_FLOAT);
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/* push arguments for params to call */
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vec_push(call->params, (ast_expression*)parser_const_float(parser, QC_M_E));
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vec_push(call->params, (ast_expression*)arg1);
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/* return pow(QC_M_E, x) */
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vec_push(body->exprs,
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(ast_expression*)ast_return_new(
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parser_ctx(parser),
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(ast_expression*)call
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)
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);
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vec_push(value->expression.params, arg1); /* float x (for param) */
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vec_push(func->blocks, body); /* {{{ body }}} */
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INTRIN_REG(func, value);
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}
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return (ast_expression*)value;
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}
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static intrin_t intrinsics[] = {
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{&intrin_exp, "__builtin_exp", "exp"},
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{&intrin_mod, "__builtin_mod", "mod"},
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{&intrin_pow, "__builtin_pow", "pow"}
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};
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ast_expression *intrin_func(parser_t *parser, const char *name) {
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static bool init = false;
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size_t i = 0;
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void *find;
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/* register the intrinsics in the hashtable for O(1) lookup */
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if (!init) {
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for (i = 0; i < sizeof(intrinsics)/sizeof(*intrinsics); i++)
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util_htset(intrin_intrinsics(), intrinsics[i].alias, &intrinsics[i]);
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init = true; /* only once */
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}
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/* jesus fucking christ all might Blub design something less fucking
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* impossible to use.
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*/
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if ((find = (void*)parser_find_global(parser, name)) && ((ast_value*)find)->expression.vtype == TYPE_FUNCTION)
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for (i = 0; i < vec_size(parser->functions); ++i)
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if (((ast_value*)find)->name && !strcmp(parser->functions[i]->name, ((ast_value*)find)->name) && parser->functions[i]->builtin < 0)
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return find;
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if ((find = util_htget(intrin_intrinsics(), name))) {
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/* intrinsic is in table. This will "generate the function" so
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* to speak (if it's not already generated).
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*/
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return ((intrin_t*)find)->intrin(parser);
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}
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parseerror(parser, "need function: `%s` compiler depends on it", name);
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return NULL;
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}
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