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/*
* Copyright 2015 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef wasm_parsing_h
#define wasm_parsing_h
#include <sstream>
#include "mixed_arena.h"
#include "shared-constants.h"
#include "support/utilities.h"
#include "wasm.h"
namespace wasm {
Expression* parseConst(cashew::IString s, WasmType type, MixedArena& allocator) {
const char *str = s.str;
auto ret = allocator.alloc<Const>();
ret->type = type;
if (isWasmTypeFloat(type)) {
if (s == INFINITY_) {
switch (type) {
case f32: ret->value = Literal(std::numeric_limits<float>::infinity()); break;
case f64: ret->value = Literal(std::numeric_limits<double>::infinity()); break;
default: return nullptr;
}
//std::cerr << "make constant " << str << " ==> " << ret->value << '\n';
return ret;
}
if (s == NEG_INFINITY) {
switch (type) {
case f32: ret->value = Literal(-std::numeric_limits<float>::infinity()); break;
case f64: ret->value = Literal(-std::numeric_limits<double>::infinity()); break;
default: return nullptr;
}
//std::cerr << "make constant " << str << " ==> " << ret->value << '\n';
return ret;
}
if (s == NAN_) {
switch (type) {
case f32: ret->value = Literal(float(std::nan(""))); break;
case f64: ret->value = Literal(double(std::nan(""))); break;
default: return nullptr;
}
//std::cerr << "make constant " << str << " ==> " << ret->value << '\n';
return ret;
}
bool negative = str[0] == '-';
const char *positive = negative ? str + 1 : str;
if (!negative) {
if (positive[0] == '+') {
positive++;
}
}
if (positive[0] == 'n' && positive[1] == 'a' && positive[2] == 'n') {
const char * modifier = positive[3] == ':' ? positive + 4 : nullptr;
assert(modifier ? positive[4] == '0' && positive[5] == 'x' : 1);
switch (type) {
case f32: {
uint32_t pattern;
if (modifier) {
std::istringstream istr(modifier);
istr >> std::hex >> pattern;
pattern |= 0x7f800000U;
} else {
pattern = 0x7fc00000U;
}
if (negative) pattern |= 0x80000000U;
if (!std::isnan(bit_cast<float>(pattern))) pattern |= 1U;
ret->value = Literal(pattern).castToF32();
break;
}
case f64: {
uint64_t pattern;
if (modifier) {
std::istringstream istr(modifier);
istr >> std::hex >> pattern;
pattern |= 0x7ff0000000000000ULL;
} else {
pattern = 0x7ff8000000000000UL;
}
if (negative) pattern |= 0x8000000000000000ULL;
if (!std::isnan(bit_cast<double>(pattern))) pattern |= 1ULL;
ret->value = Literal(pattern).castToF64();
break;
}
default: return nullptr;
}
//std::cerr << "make constant " << str << " ==> " << ret->value << '\n';
return ret;
}
if (s == NEG_NAN) {
switch (type) {
case f32: ret->value = Literal(float(-std::nan(""))); break;
case f64: ret->value = Literal(double(-std::nan(""))); break;
default: return nullptr;
}
//std::cerr << "make constant " << str << " ==> " << ret->value << '\n';
return ret;
}
}
switch (type) {
case i32: {
if ((str[0] == '0' && str[1] == 'x') || (str[0] == '-' && str[1] == '0' && str[2] == 'x')) {
bool negative = str[0] == '-';
if (negative) str++;
std::istringstream istr(str);
uint32_t temp;
istr >> std::hex >> temp;
ret->value = Literal(negative ? -temp : temp);
} else {
std::istringstream istr(str);
int32_t temp;
istr >> temp;
ret->value = Literal(temp);
}
break;
}
case i64: {
if ((str[0] == '0' && str[1] == 'x') || (str[0] == '-' && str[1] == '0' && str[2] == 'x')) {
bool negative = str[0] == '-';
if (negative) str++;
std::istringstream istr(str);
uint64_t temp;
istr >> std::hex >> temp;
ret->value = Literal(negative ? -temp : temp);
} else {
std::istringstream istr(str);
int64_t temp;
istr >> temp;
ret->value = Literal(temp);
}
break;
}
case f32: {
char *end;
ret->value = Literal(strtof(str, &end));
break;
}
case f64: {
char *end;
ret->value = Literal(strtod(str, &end));
break;
}
default: return nullptr;
}
assert(ret->value.type == type);
//std::cerr << "make constant " << str << " ==> " << ret->value << '\n';
return ret;
}
} // namespace wasm
#endif // wasm_parsing_h
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