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//===-- lld/Support/NumParse.cpp - Number parsing ---------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief Parses string in various formats to decimal.
///
//===----------------------------------------------------------------------===//
#include "lld/Support/NumParse.h"
using namespace llvm;
namespace lld {
/// \brief Convert a string in decimal to decimal.
llvm::ErrorOr<uint64_t> parseDecimal(StringRef str) {
uint64_t res = 0;
for (auto &c : str) {
res *= 10;
if (c < '0' || c > '9')
return llvm::ErrorOr<uint64_t>(std::make_error_code(std::errc::io_error));
res += c - '0';
}
return res;
}
/// \brief Convert a string in octal to decimal.
llvm::ErrorOr<uint64_t> parseOctal(StringRef str) {
uint64_t res = 0;
for (auto &c : str) {
res <<= 3;
if (c < '0' || c > '7')
return llvm::ErrorOr<uint64_t>(std::make_error_code(std::errc::io_error));
res += c - '0';
}
return res;
}
/// \brief Convert a string in Binary to decimal.
llvm::ErrorOr<uint64_t> parseBinary(StringRef str) {
uint64_t res = 0;
for (auto &c : str) {
res <<= 1;
if (c != '0' && c != '1')
return llvm::ErrorOr<uint64_t>(std::make_error_code(std::errc::io_error));
res += c - '0';
}
return res;
}
/// \brief Convert a string in Hexadecimal to decimal.
llvm::ErrorOr<uint64_t> parseHex(StringRef str) {
uint64_t res = 0;
for (auto &c : str) {
res <<= 4;
if (c >= '0' && c <= '9')
res += c - '0';
else if (c >= 'a' && c <= 'f')
res += c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
res += c - 'A' + 10;
else
return llvm::ErrorOr<uint64_t>(std::make_error_code(std::errc::io_error));
}
return res;
}
/// \brief Parse a number represested in a string as
// Hexadecimal, Octal, Binary or Decimal to decimal
llvm::ErrorOr<uint64_t> parseNum(StringRef str, bool parseExtensions) {
unsigned multiplier = 1;
enum NumKind { decimal, hex, octal, binary };
NumKind kind = llvm::StringSwitch<NumKind>(str)
.StartsWith("0x", hex)
.StartsWith("0X", hex)
.StartsWith("0", octal)
.Default(decimal);
if (parseExtensions) {
// Parse scale
if (str.endswith("K")) {
multiplier = 1 << 10;
str = str.drop_back();
} else if (str.endswith("M")) {
multiplier = 1 << 20;
str = str.drop_back();
}
// Parse type
if (str.endswith_lower("o")) {
kind = octal;
str = str.drop_back();
} else if (str.endswith_lower("h")) {
kind = hex;
str = str.drop_back();
} else if (str.endswith_lower("d")) {
kind = decimal;
str = str.drop_back();
} else if (str.endswith_lower("b")) {
kind = binary;
str = str.drop_back();
}
}
llvm::ErrorOr<uint64_t> res(0);
switch (kind) {
case hex:
if (str.startswith_lower("0x"))
str = str.drop_front(2);
res = parseHex(str);
break;
case octal:
res = parseOctal(str);
break;
case decimal:
res = parseDecimal(str);
break;
case binary:
res = parseBinary(str);
break;
}
if (res.getError())
return res;
*res = *res * multiplier;
return res;
}
}
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