129 lines
4.1 KiB
C++
129 lines
4.1 KiB
C++
/*
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* Copyright 2016 WebAssembly Community Group participants
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef WABT_LITERAL_H_
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#define WABT_LITERAL_H_
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#include <cstdint>
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#include "wabt/common.h"
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namespace wabt {
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// These functions all return Result::Ok on success and Result::Error on
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// failure.
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//
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// NOTE: the functions are written for use with wast-lexer, assuming that the
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// literal has already matched the patterns defined there. As a result, the
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// only validation that is done is for overflow, not for otherwise bogus input.
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enum class LiteralType {
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Int,
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Float,
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Hexfloat,
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Infinity,
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Nan,
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};
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enum class ParseIntType {
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UnsignedOnly = 0,
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SignedAndUnsigned = 1,
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};
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/* Size of char buffer required to hold hex representation of a float/double */
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#define WABT_MAX_FLOAT_HEX 20
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#define WABT_MAX_DOUBLE_HEX 40
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Result ParseHexdigit(char c, uint32_t* out);
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Result ParseInt8(const char* s,
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const char* end,
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uint8_t* out,
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ParseIntType parse_type);
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Result ParseInt16(const char* s,
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const char* end,
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uint16_t* out,
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ParseIntType parse_type);
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Result ParseInt32(const char* s,
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const char* end,
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uint32_t* out,
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ParseIntType parse_type);
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Result ParseInt64(const char* s,
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const char* end,
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uint64_t* out,
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ParseIntType parse_type);
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Result ParseUint64(const char* s, const char* end, uint64_t* out);
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Result ParseUint128(const char* s, const char* end, v128* out);
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Result ParseFloat(LiteralType literal_type,
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const char* s,
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const char* end,
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uint32_t* out_bits);
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Result ParseDouble(LiteralType literal_type,
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const char* s,
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const char* end,
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uint64_t* out_bits);
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// Same as above but taking a string_view
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inline Result ParseInt8(std::string_view v,
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uint8_t* out,
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ParseIntType parse_type) {
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return ParseInt8(v.data(), v.data() + v.size(), out, parse_type);
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}
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inline Result ParseInt16(std::string_view v,
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uint16_t* out,
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ParseIntType parse_type) {
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return ParseInt16(v.data(), v.data() + v.size(), out, parse_type);
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}
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inline Result ParseInt32(std::string_view v,
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uint32_t* out,
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ParseIntType parse_type) {
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return ParseInt32(v.data(), v.data() + v.size(), out, parse_type);
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}
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inline Result ParseInt64(std::string_view v,
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uint64_t* out,
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ParseIntType parse_type) {
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return ParseInt64(v.data(), v.data() + v.size(), out, parse_type);
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}
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inline Result ParseUint64(std::string_view v, uint64_t* out) {
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return ParseUint64(v.data(), v.data() + v.size(), out);
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}
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inline Result ParseUint128(std::string_view v, v128* out) {
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return ParseUint128(v.data(), v.data() + v.size(), out);
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}
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inline Result ParseFloat(LiteralType literal_type,
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std::string_view v,
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uint32_t* out_bits) {
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return ParseFloat(literal_type, v.data(), v.data() + v.size(), out_bits);
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}
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inline Result ParseDouble(LiteralType literal_type,
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std::string_view v,
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uint64_t* out_bits) {
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return ParseDouble(literal_type, v.data(), v.data() + v.size(), out_bits);
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}
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void WriteFloatHex(char* buffer, size_t size, uint32_t bits);
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void WriteDoubleHex(char* buffer, size_t size, uint64_t bits);
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void WriteUint128(char* buffer, size_t size, v128 bits);
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} // namespace wabt
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#endif /* WABT_LITERAL_H_ */
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