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gmqcc/intrin.c

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/*
* Copyright (C) 2012, 2013
* Dale Weiler
*
* 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 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 <string.h>
#include "parser.h"
/*
* Provides all the "intrinsics" / "builtins" for GMQCC. These can do
* a few things, they can provide fall back implementations for math
* functions if the definitions don't exist for some given engine. Or
* then can determine definitions for existing builtins, and simply
* wrap back to them instead. This is like a "portable" intrface that
* is entered when -fintrin is used (causing all existing builtins to
* be ignored by the compiler and instead interface through here.
*/
#define intrin_ctx(I) parser_ctx((I)->parser)
static GMQCC_INLINE ast_function *intrin_value(intrin_t *intrin, ast_value **out, const char *name, qcint_t vtype) {
ast_value *value = NULL;
ast_function *func = NULL;
char buffer[1024];
char stype [1024];
util_snprintf(buffer, sizeof(buffer), "__builtin_%s", name);
util_snprintf(stype, sizeof(stype), "<%s>", type_name[vtype]);
value = ast_value_new(intrin_ctx(intrin), buffer, TYPE_FUNCTION);
value->intrinsic = true;
value->expression.next = (ast_expression*)ast_value_new(intrin_ctx(intrin), stype, vtype);
func = ast_function_new(intrin_ctx(intrin), buffer, value);
value->expression.flags |= AST_FLAG_ERASEABLE;
*out = value;
return func;
}
static GMQCC_INLINE void intrin_reg(intrin_t *intrin, ast_value *const value, ast_function *const func) {
vec_push(intrin->parser->functions, func);
vec_push(intrin->parser->globals, (ast_expression*)value);
}
#define QC_M_E 2.718281828459045f
#define QC_POW_EPSILON 0.00001f
/*
* since some intrinsics depend on each other there is the possibility
* that an intrinsic will fail to get a 'depended' function that a
* builtin needs, causing some dependency in the chain to have a NULL
* function. This will cause a segmentation fault at code generation,
* even though an error was raised. To contiue to allow it (instead
* of stopping compilation right away). We need to return from the
* parser, before compilation stops after all the collected errors.
*/
static ast_expression *intrin_func_self(intrin_t *intrin, const char *name, const char *from);
static ast_expression *intrin_nullfunc(intrin_t *intrin) {
ast_value *value = NULL;
ast_function *func = intrin_value(intrin, &value, "nil", TYPE_VOID);
vec_push(func->blocks, ast_block_new(intrin_ctx(intrin)));
intrin_reg(intrin, value, func);
return (ast_expression*)value;
}
static ast_expression *intrin_pow(intrin_t *intrin) {
/*
*
* float pow(float base, float exp) {
* float result;
* float low;
* float high;
* float mid;
* float square;
* float accumulate;
*
* if (exp == 0.0)
* return base;
* if (exp < 0)
* return 1.0 / pow(base, -exp);
* if (exp >= 1) {
* result = pow(base, exp / 2);
* return result * result;
* }
*
* low = 0.0f;
* high = 1.0f;
* square = sqrt(base);
* accumulate = square;
* mid = high / 2.0f
*
* while (fabs(mid - exp) > QC_POW_EPSILON) {
* square = sqrt(square);
* if (mid < exp) {
* low = mid;
* accumulate *= square;
* } else {
* high = mid;
* accumulate *= (1.0f / square);
* }
* mid = (low + high) / 2;
* }
* return accumulate;
* }
*/
ast_value *value = NULL;
ast_function *func = intrin_value(intrin, &value, "pow", TYPE_FLOAT);
/* prepare some calls for later */
ast_call *callpow1 = ast_call_new(intrin_ctx(intrin), (ast_expression*)value); /* for pow(base, -exp) */
ast_call *callpow2 = ast_call_new(intrin_ctx(intrin), (ast_expression*)value); /* for pow(vase, exp / 2) */
ast_call *callsqrt1 = ast_call_new(intrin_ctx(intrin), intrin_func_self(intrin, "sqrt", "pow")); /* for sqrt(base) */
ast_call *callsqrt2 = ast_call_new(intrin_ctx(intrin), intrin_func_self(intrin, "sqrt", "pow")); /* for sqrt(square) */
ast_call *callfabs = ast_call_new(intrin_ctx(intrin), intrin_func_self(intrin, "fabs", "pow")); /* for fabs(mid - exp) */
/* prepare some blocks for later */
ast_block *expgt1 = ast_block_new(intrin_ctx(intrin));
ast_block *midltexp = ast_block_new(intrin_ctx(intrin));
ast_block *midltexpelse = ast_block_new(intrin_ctx(intrin));
ast_block *whileblock = ast_block_new(intrin_ctx(intrin));
/* float pow(float base, float exp) */
ast_value *base = ast_value_new(intrin_ctx(intrin), "base", TYPE_FLOAT);
ast_value *exp = ast_value_new(intrin_ctx(intrin), "exp", TYPE_FLOAT);
/* { */
ast_block *body = ast_block_new(intrin_ctx(intrin));
/*
* float result;
* float low;
* float high;
* float square;
* float accumulate;
* float mid;
*/
ast_value *result = ast_value_new(intrin_ctx(intrin), "result", TYPE_FLOAT);
ast_value *low = ast_value_new(intrin_ctx(intrin), "low", TYPE_FLOAT);
ast_value *high = ast_value_new(intrin_ctx(intrin), "high", TYPE_FLOAT);
ast_value *square = ast_value_new(intrin_ctx(intrin), "square", TYPE_FLOAT);
ast_value *accumulate = ast_value_new(intrin_ctx(intrin), "accumulate", TYPE_FLOAT);
ast_value *mid = ast_value_new(intrin_ctx(intrin), "mid", TYPE_FLOAT);
vec_push(body->locals, result);
vec_push(body->locals, low);
vec_push(body->locals, high);
vec_push(body->locals, square);
vec_push(body->locals, accumulate);
vec_push(body->locals, mid);
vec_push(value->expression.params, base);
vec_push(value->expression.params, exp);
/*
* if (exp == 0.0)
* return base;
*/
vec_push(body->exprs,
(ast_expression*)ast_ifthen_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_EQ_F,
(ast_expression*)exp,
(ast_expression*)intrin->fold->imm_float[0]
),
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)base
),
NULL
)
);
/* <callpow1> = pow(base, -exp) */
vec_push(callpow1->params, (ast_expression*)base);
vec_push(callpow1->params,
(ast_expression*)ast_unary_new(
intrin_ctx(intrin),
VINSTR_NEG_F,
(ast_expression*)exp
)
);
/*
* if (exp < 0)
* return 1.0 / <callpow1>;
*/
vec_push(body->exprs,
(ast_expression*)ast_ifthen_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_LT,
(ast_expression*)exp,
(ast_expression*)intrin->fold->imm_float[0]
),
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_DIV_F,
(ast_expression*)intrin->fold->imm_float[1],
(ast_expression*)callpow1
)
),
NULL
)
);
/* <callpow2> = pow(base, exp / 2) */
vec_push(callpow2->params, (ast_expression*)base);
vec_push(callpow2->params,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_DIV_F,
(ast_expression*)exp,
(ast_expression*)fold_constgen_float(intrin->fold, 2.0f)
)
);
/*
* <expgt1> = {
* result = <callpow2>;
* return result * result;
* }
*/
vec_push(expgt1->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)result,
(ast_expression*)callpow2
)
);
vec_push(expgt1->exprs,
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_MUL_F,
(ast_expression*)result,
(ast_expression*)result
)
)
);
/*
* if (exp >= 1) {
* <expgt1>
* }
*/
vec_push(body->exprs,
(ast_expression*)ast_ifthen_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_GE,
(ast_expression*)exp,
(ast_expression*)intrin->fold->imm_float[1]
),
(ast_expression*)expgt1,
NULL
)
);
/*
* <callsqrt1> = sqrt(base)
*/
vec_push(callsqrt1->params, (ast_expression*)base);
/*
* low = 0.0f;
* high = 1.0f;
* square = sqrt(base);
* accumulate = square;
* mid = high / 2.0f;
*/
vec_push(body->exprs,
(ast_expression*)ast_store_new(intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)low,
(ast_expression*)intrin->fold->imm_float[0]
)
);
vec_push(body->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)high,
(ast_expression*)intrin->fold->imm_float[1]
)
);
vec_push(body->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)square,
(ast_expression*)callsqrt1
)
);
vec_push(body->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)accumulate,
(ast_expression*)square
)
);
vec_push(body->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)mid,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_DIV_F,
(ast_expression*)high,
(ast_expression*)fold_constgen_float(intrin->fold, 2.0f)
)
)
);
/*
* <midltexp> = {
* low = mid;
* accumulate *= square;
* }
*/
vec_push(midltexp->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)low,
(ast_expression*)mid
)
);
vec_push(midltexp->exprs,
(ast_expression*)ast_binstore_new(
intrin_ctx(intrin),
INSTR_STORE_F,
INSTR_MUL_F,
(ast_expression*)accumulate,
(ast_expression*)square
)
);
/*
* <midltexpelse> = {
* high = mid;
* accumulate *= (1.0 / square);
* }
*/
vec_push(midltexpelse->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)high,
(ast_expression*)mid
)
);
vec_push(midltexpelse->exprs,
(ast_expression*)ast_binstore_new(
intrin_ctx(intrin),
INSTR_STORE_F,
INSTR_MUL_F,
(ast_expression*)accumulate,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_DIV_F,
(ast_expression*)intrin->fold->imm_float[1],
(ast_expression*)square
)
)
);
/*
* <callsqrt2> = sqrt(square)
*/
vec_push(callsqrt2->params, (ast_expression*)square);
/*
* <whileblock> = {
* square = <callsqrt2>;
* if (mid < exp)
* <midltexp>;
* else
* <midltexpelse>;
*
* mid = (low + high) / 2;
* }
*/
vec_push(whileblock->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)square,
(ast_expression*)callsqrt2
)
);
vec_push(whileblock->exprs,
(ast_expression*)ast_ifthen_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_LT,
(ast_expression*)mid,
(ast_expression*)exp
),
(ast_expression*)midltexp,
(ast_expression*)midltexpelse
)
);
vec_push(whileblock->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)mid,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_DIV_F,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_ADD_F,
(ast_expression*)low,
(ast_expression*)high
),
(ast_expression*)fold_constgen_float(intrin->fold, 2.0f)
)
)
);
/*
* <callabs> = fabs(mid - exp)
*/
vec_push(callfabs->params,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_SUB_F,
(ast_expression*)mid,
(ast_expression*)exp
)
);
/*
* while (<callfabs> > epsilon)
* <whileblock>
*/
vec_push(body->exprs,
(ast_expression*)ast_loop_new(
intrin_ctx(intrin),
/* init */
NULL,
/* pre condition */
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_GT,
(ast_expression*)callfabs,
(ast_expression*)fold_constgen_float(intrin->fold, QC_POW_EPSILON)
),
/* pre not */
false,
/* post condition */
NULL,
/* post not */
false,
/* increment expression */
NULL,
/* code block */
(ast_expression*)whileblock
)
);
/* return midvalue */
vec_push(body->exprs,
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)accumulate
)
);
/* } */
vec_push(func->blocks, body);
intrin_reg(intrin, value, func);
return (ast_expression*)value;
}
static ast_expression *intrin_mod(intrin_t *intrin) {
/*
* float mod(float a, float b) {
* float div = a / b;
* float sign = (div < 0.0f) ? -1 : 1;
* return a - b * sign * floor(sign * div);
* }
*/
ast_value *value = NULL;
ast_call *call = ast_call_new (intrin_ctx(intrin), intrin_func_self(intrin, "floor", "mod"));
ast_value *a = ast_value_new(intrin_ctx(intrin), "a", TYPE_FLOAT);
ast_value *b = ast_value_new(intrin_ctx(intrin), "b", TYPE_FLOAT);
ast_value *div = ast_value_new(intrin_ctx(intrin), "div", TYPE_FLOAT);
ast_value *sign = ast_value_new(intrin_ctx(intrin), "sign", TYPE_FLOAT);
ast_block *body = ast_block_new(intrin_ctx(intrin));
ast_function *func = intrin_value(intrin, &value, "mod", TYPE_FLOAT);
vec_push(value->expression.params, a);
vec_push(value->expression.params, b);
vec_push(body->locals, div);
vec_push(body->locals, sign);
/* div = a / b; */
vec_push(body->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)div,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_DIV_F,
(ast_expression*)a,
(ast_expression*)b
)
)
);
/* sign = (div < 0.0f) ? -1 : 1; */
vec_push(body->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)sign,
(ast_expression*)ast_ternary_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_LT,
(ast_expression*)div,
(ast_expression*)intrin->fold->imm_float[0]
),
(ast_expression*)intrin->fold->imm_float[2],
(ast_expression*)intrin->fold->imm_float[1]
)
)
);
/* floor(sign * div) */
vec_push(call->params,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_MUL_F,
(ast_expression*)sign,
(ast_expression*)div
)
);
/* return a - b * sign * <call> */
vec_push(body->exprs,
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_SUB_F,
(ast_expression*)a,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_MUL_F,
(ast_expression*)b,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_MUL_F,
(ast_expression*)sign,
(ast_expression*)call
)
)
)
)
);
vec_push(func->blocks, body); /* {{{ body }}} */
intrin_reg(intrin, value, func);
return (ast_expression*)value;
}
static ast_expression *intrin_exp(intrin_t *intrin) {
/*
* float exp(float x) {
* // mul 10 to round increments of 0.1f
* return floor((pow(QC_M_E, x) * 10) + 0.5) / 10;
* }
*/
ast_value *value = NULL;
ast_call *callpow = ast_call_new (intrin_ctx(intrin), intrin_func_self(intrin, "pow", "exp"));
ast_call *callfloor = ast_call_new (intrin_ctx(intrin), intrin_func_self(intrin, "floor", "exp"));
ast_value *arg1 = ast_value_new(intrin_ctx(intrin), "x", TYPE_FLOAT);
ast_block *body = ast_block_new(intrin_ctx(intrin));
ast_function *func = intrin_value(intrin, &value, "exp", TYPE_FLOAT);
vec_push(value->expression.params, arg1);
vec_push(callpow->params, (ast_expression*)fold_constgen_float(intrin->fold, QC_M_E));
vec_push(callpow->params, (ast_expression*)arg1);
vec_push(callfloor->params,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_ADD_F,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_MUL_F,
(ast_expression*)callpow,
(ast_expression*)fold_constgen_float(intrin->fold, 10.0f)
),
(ast_expression*)fold_constgen_float(intrin->fold, 0.5f)
)
);
/* return <callfloor> / 10.0f */
vec_push(body->exprs,
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_DIV_F,
(ast_expression*)callfloor,
(ast_expression*)fold_constgen_float(intrin->fold, 10.0f)
)
)
);
vec_push(func->blocks, body); /* {{{ body }}} */
intrin_reg(intrin, value, func);
return (ast_expression*)value;
}
static ast_expression *intrin_isnan(intrin_t *intrin) {
/*
* float isnan(float x) {
* float local;
* local = x;
*
* return (x != local);
* }
*/
ast_value *value = NULL;
ast_value *arg1 = ast_value_new(intrin_ctx(intrin), "x", TYPE_FLOAT);
ast_value *local = ast_value_new(intrin_ctx(intrin), "local", TYPE_FLOAT);
ast_block *body = ast_block_new(intrin_ctx(intrin));
ast_function *func = intrin_value(intrin, &value, "isnan", TYPE_FLOAT);
vec_push(body->locals, local);
vec_push(body->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)local,
(ast_expression*)arg1
)
);
vec_push(body->exprs,
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_NE_F,
(ast_expression*)arg1,
(ast_expression*)local
)
)
);
vec_push(value->expression.params, arg1);
vec_push(func->blocks, body);
intrin_reg(intrin, value, func);
return (ast_expression*)value;
}
static ast_expression *intrin_fabs(intrin_t *intrin) {
/*
* float fabs(float x) {
* return x < 0 ? -x : x;
* }
*/
ast_value *value = NULL;
ast_value *arg1 = ast_value_new(intrin_ctx(intrin), "x", TYPE_FLOAT);
ast_block *body = ast_block_new(intrin_ctx(intrin));
ast_function *func = intrin_value(intrin, &value, "fabs", TYPE_FLOAT);
vec_push(body->exprs,
(ast_expression*)ast_return_new(
intrin_ctx(intrin),
(ast_expression*)ast_ternary_new(
intrin_ctx(intrin),
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_LE,
(ast_expression*)arg1,
(ast_expression*)intrin->fold->imm_float[0]
),
(ast_expression*)ast_unary_new(
intrin_ctx(intrin),
VINSTR_NEG_F,
(ast_expression*)arg1
),
(ast_expression*)arg1
)
)
);
vec_push(value->expression.params, arg1);
vec_push(func->blocks, body);
intrin_reg(intrin, value, func);
return (ast_expression*)value;
}
/*
* TODO: make static (and handle ast_type_string) here for the builtin
* instead of in SYA parse close.
*/
ast_expression *intrin_debug_typestring(intrin_t *intrin) {
(void)intrin;
return (ast_expression*)0x1;
}
static const intrin_func_t intrinsics[] = {
{&intrin_exp, "__builtin_exp", "exp", 1},
{&intrin_mod, "__builtin_mod", "mod", 2},
{&intrin_pow, "__builtin_pow", "pow", 2},
{&intrin_isnan, "__builtin_isnan", "isnan", 1},
{&intrin_fabs, "__builtin_fabs", "fabs", 1},
{&intrin_debug_typestring, "__builtin_debug_typestring", "", 0},
{&intrin_nullfunc, "#nullfunc", "", 0}
};
static void intrin_error(intrin_t *intrin, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vcompile_error(intrin->parser->lex->tok.ctx, fmt, ap);
va_end(ap);
}
/* exposed */
intrin_t *intrin_init(parser_t *parser) {
intrin_t *intrin = (intrin_t*)mem_a(sizeof(intrin_t));
size_t i;
intrin->parser = parser;
intrin->fold = parser->fold;
intrin->intrinsics = NULL;
intrin->generated = NULL;
vec_append(intrin->intrinsics, GMQCC_ARRAY_COUNT(intrinsics), intrinsics);
/* populate with null pointers for tracking generation */
for (i = 0; i < GMQCC_ARRAY_COUNT(intrinsics); i++)
vec_push(intrin->generated, NULL);
return intrin;
}
void intrin_cleanup(intrin_t *intrin) {
vec_free(intrin->intrinsics);
vec_free(intrin->generated);
mem_d(intrin);
}
ast_expression *intrin_fold(intrin_t *intrin, ast_value *value, ast_expression **exprs) {
size_t i;
if (!value || !value->name)
return NULL;
for (i = 0; i < vec_size(intrin->intrinsics); i++)
if (!strcmp(value->name, intrin->intrinsics[i].name))
return (vec_size(exprs) != intrin->intrinsics[i].args)
? NULL
: fold_intrin(intrin->fold, value->name + 10, exprs);
return NULL;
}
static GMQCC_INLINE ast_expression *intrin_func_try(intrin_t *intrin, size_t offset, const char *compare) {
size_t i;
for (i = 0; i < vec_size(intrin->intrinsics); i++) {
if (strcmp(*(char **)((char *)&intrin->intrinsics[i] + offset), compare))
continue;
if (intrin->generated[i])
return intrin->generated[i];
return intrin->generated[i] = intrin->intrinsics[i].intrin(intrin);
}
return NULL;
}
static ast_expression *intrin_func_self(intrin_t *intrin, const char *name, const char *from) {
size_t i;
ast_expression *find;
/* try current first */
if ((find = parser_find_global(intrin->parser, name)) && ((ast_value*)find)->expression.vtype == TYPE_FUNCTION)
for (i = 0; i < vec_size(intrin->parser->functions); ++i)
if (((ast_value*)find)->name && !strcmp(intrin->parser->functions[i]->name, ((ast_value*)find)->name) && intrin->parser->functions[i]->builtin < 0)
return find;
/* try name second */
if ((find = intrin_func_try(intrin, offsetof(intrin_func_t, name), name)))
return find;
/* try alias third */
if ((find = intrin_func_try(intrin, offsetof(intrin_func_t, alias), name)))
return find;
if (from)
intrin_error(intrin, "need function `%s', compiler depends on it for `__builtin_%s'", name, from);
else
intrin_error(intrin, "need function `%s', compiler depends on it", name);
return intrin_func(intrin, "#nullfunc");
}
ast_expression *intrin_func(intrin_t *intrin, const char *name) {
return intrin_func_self(intrin, name, NULL);
}
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