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/*
* Copyright 2016 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 WABT_LITERAL_H_
#define WABT_LITERAL_H_
#include <cstdint>
#include "wabt/common.h"
namespace wabt {
// These functions all return Result::Ok on success and Result::Error on
// failure.
//
// NOTE: the functions are written for use with wast-lexer, assuming that the
// literal has already matched the patterns defined there. As a result, the
// only validation that is done is for overflow, not for otherwise bogus input.
enum class LiteralType {
Int,
Float,
Hexfloat,
Infinity,
Nan,
};
enum class ParseIntType {
UnsignedOnly = 0,
SignedAndUnsigned = 1,
};
/* Size of char buffer required to hold hex representation of a float/double */
#define WABT_MAX_FLOAT_HEX 20
#define WABT_MAX_DOUBLE_HEX 40
Result ParseHexdigit(char c, uint32_t* out);
Result ParseInt8(const char* s,
const char* end,
uint8_t* out,
ParseIntType parse_type);
Result ParseInt16(const char* s,
const char* end,
uint16_t* out,
ParseIntType parse_type);
Result ParseInt32(const char* s,
const char* end,
uint32_t* out,
ParseIntType parse_type);
Result ParseInt64(const char* s,
const char* end,
uint64_t* out,
ParseIntType parse_type);
Result ParseUint64(const char* s, const char* end, uint64_t* out);
Result ParseUint128(const char* s, const char* end, v128* out);
Result ParseFloat(LiteralType literal_type,
const char* s,
const char* end,
uint32_t* out_bits);
Result ParseDouble(LiteralType literal_type,
const char* s,
const char* end,
uint64_t* out_bits);
// Same as above but taking a string_view
inline Result ParseInt8(std::string_view v,
uint8_t* out,
ParseIntType parse_type) {
return ParseInt8(v.data(), v.data() + v.size(), out, parse_type);
}
inline Result ParseInt16(std::string_view v,
uint16_t* out,
ParseIntType parse_type) {
return ParseInt16(v.data(), v.data() + v.size(), out, parse_type);
}
inline Result ParseInt32(std::string_view v,
uint32_t* out,
ParseIntType parse_type) {
return ParseInt32(v.data(), v.data() + v.size(), out, parse_type);
}
inline Result ParseInt64(std::string_view v,
uint64_t* out,
ParseIntType parse_type) {
return ParseInt64(v.data(), v.data() + v.size(), out, parse_type);
}
inline Result ParseUint64(std::string_view v, uint64_t* out) {
return ParseUint64(v.data(), v.data() + v.size(), out);
}
inline Result ParseUint128(std::string_view v, v128* out) {
return ParseUint128(v.data(), v.data() + v.size(), out);
}
inline Result ParseFloat(LiteralType literal_type,
std::string_view v,
uint32_t* out_bits) {
return ParseFloat(literal_type, v.data(), v.data() + v.size(), out_bits);
}
inline Result ParseDouble(LiteralType literal_type,
std::string_view v,
uint64_t* out_bits) {
return ParseDouble(literal_type, v.data(), v.data() + v.size(), out_bits);
}
void WriteFloatHex(char* buffer, size_t size, uint32_t bits);
void WriteDoubleHex(char* buffer, size_t size, uint64_t bits);
void WriteUint128(char* buffer, size_t size, v128 bits);
} // namespace wabt
#endif /* WABT_LITERAL_H_ */
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