mirror of
https://git.suyu.dev/suyu/suyu.git
synced 2024-11-24 15:52:45 +01:00
206 lines
5.8 KiB
C++
206 lines
5.8 KiB
C++
//===--- Utility.h -------------------*- mode:c++;eval:(read-only-mode) -*-===//
|
|
// Do not edit! See README.txt.
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-FileCopyrightText: Part of the LLVM Project
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Provide some utility classes for use in the demangler.
|
|
// There are two copies of this file in the source tree. The one in libcxxabi
|
|
// is the original and the one in llvm is the copy. Use cp-to-llvm.sh to update
|
|
// the copy. See README.txt for more details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef DEMANGLE_UTILITY_H
|
|
#define DEMANGLE_UTILITY_H
|
|
|
|
#include "DemangleConfig.h"
|
|
|
|
#include <array>
|
|
#include <cassert>
|
|
#include <cstdint>
|
|
#include <cstdlib>
|
|
#include <cstring>
|
|
#include <exception>
|
|
#include <limits>
|
|
#include <string_view>
|
|
|
|
DEMANGLE_NAMESPACE_BEGIN
|
|
|
|
// Stream that AST nodes write their string representation into after the AST
|
|
// has been parsed.
|
|
class OutputBuffer {
|
|
char *Buffer = nullptr;
|
|
size_t CurrentPosition = 0;
|
|
size_t BufferCapacity = 0;
|
|
|
|
// Ensure there are at least N more positions in the buffer.
|
|
void grow(size_t N) {
|
|
size_t Need = N + CurrentPosition;
|
|
if (Need > BufferCapacity) {
|
|
// Reduce the number of reallocations, with a bit of hysteresis. The
|
|
// number here is chosen so the first allocation will more-than-likely not
|
|
// allocate more than 1K.
|
|
Need += 1024 - 32;
|
|
BufferCapacity *= 2;
|
|
if (BufferCapacity < Need)
|
|
BufferCapacity = Need;
|
|
Buffer = static_cast<char *>(std::realloc(Buffer, BufferCapacity));
|
|
if (Buffer == nullptr)
|
|
std::terminate();
|
|
}
|
|
}
|
|
|
|
OutputBuffer &writeUnsigned(uint64_t N, bool isNeg = false) {
|
|
std::array<char, 21> Temp;
|
|
char *TempPtr = Temp.data() + Temp.size();
|
|
|
|
// Output at least one character.
|
|
do {
|
|
*--TempPtr = char('0' + N % 10);
|
|
N /= 10;
|
|
} while (N);
|
|
|
|
// Add negative sign.
|
|
if (isNeg)
|
|
*--TempPtr = '-';
|
|
|
|
return operator+=(
|
|
std::string_view(TempPtr, Temp.data() + Temp.size() - TempPtr));
|
|
}
|
|
|
|
public:
|
|
OutputBuffer(char *StartBuf, size_t Size)
|
|
: Buffer(StartBuf), BufferCapacity(Size) {}
|
|
OutputBuffer(char *StartBuf, size_t *SizePtr)
|
|
: OutputBuffer(StartBuf, StartBuf ? *SizePtr : 0) {}
|
|
OutputBuffer() = default;
|
|
// Non-copyable
|
|
OutputBuffer(const OutputBuffer &) = delete;
|
|
OutputBuffer &operator=(const OutputBuffer &) = delete;
|
|
|
|
operator std::string_view() const {
|
|
return std::string_view(Buffer, CurrentPosition);
|
|
}
|
|
|
|
/// If a ParameterPackExpansion (or similar type) is encountered, the offset
|
|
/// into the pack that we're currently printing.
|
|
unsigned CurrentPackIndex = std::numeric_limits<unsigned>::max();
|
|
unsigned CurrentPackMax = std::numeric_limits<unsigned>::max();
|
|
|
|
/// When zero, we're printing template args and '>' needs to be parenthesized.
|
|
/// Use a counter so we can simply increment inside parentheses.
|
|
unsigned GtIsGt = 1;
|
|
|
|
bool isGtInsideTemplateArgs() const { return GtIsGt == 0; }
|
|
|
|
void printOpen(char Open = '(') {
|
|
GtIsGt++;
|
|
*this += Open;
|
|
}
|
|
void printClose(char Close = ')') {
|
|
GtIsGt--;
|
|
*this += Close;
|
|
}
|
|
|
|
OutputBuffer &operator+=(std::string_view R) {
|
|
if (size_t Size = R.size()) {
|
|
grow(Size);
|
|
std::memcpy(Buffer + CurrentPosition, &*R.begin(), Size);
|
|
CurrentPosition += Size;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
OutputBuffer &operator+=(char C) {
|
|
grow(1);
|
|
Buffer[CurrentPosition++] = C;
|
|
return *this;
|
|
}
|
|
|
|
OutputBuffer &prepend(std::string_view R) {
|
|
size_t Size = R.size();
|
|
|
|
grow(Size);
|
|
std::memmove(Buffer + Size, Buffer, CurrentPosition);
|
|
std::memcpy(Buffer, &*R.begin(), Size);
|
|
CurrentPosition += Size;
|
|
|
|
return *this;
|
|
}
|
|
|
|
OutputBuffer &operator<<(std::string_view R) { return (*this += R); }
|
|
|
|
OutputBuffer &operator<<(char C) { return (*this += C); }
|
|
|
|
OutputBuffer &operator<<(long long N) {
|
|
return writeUnsigned(static_cast<unsigned long long>(std::abs(N)), N < 0);
|
|
}
|
|
|
|
OutputBuffer &operator<<(unsigned long long N) {
|
|
return writeUnsigned(N, false);
|
|
}
|
|
|
|
OutputBuffer &operator<<(long N) {
|
|
return this->operator<<(static_cast<long long>(N));
|
|
}
|
|
|
|
OutputBuffer &operator<<(unsigned long N) {
|
|
return this->operator<<(static_cast<unsigned long long>(N));
|
|
}
|
|
|
|
OutputBuffer &operator<<(int N) {
|
|
return this->operator<<(static_cast<long long>(N));
|
|
}
|
|
|
|
OutputBuffer &operator<<(unsigned int N) {
|
|
return this->operator<<(static_cast<unsigned long long>(N));
|
|
}
|
|
|
|
void insert(size_t Pos, const char *S, size_t N) {
|
|
assert(Pos <= CurrentPosition);
|
|
if (N == 0)
|
|
return;
|
|
grow(N);
|
|
std::memmove(Buffer + Pos + N, Buffer + Pos, CurrentPosition - Pos);
|
|
std::memcpy(Buffer + Pos, S, N);
|
|
CurrentPosition += N;
|
|
}
|
|
|
|
size_t getCurrentPosition() const { return CurrentPosition; }
|
|
void setCurrentPosition(size_t NewPos) { CurrentPosition = NewPos; }
|
|
|
|
char back() const {
|
|
assert(CurrentPosition);
|
|
return Buffer[CurrentPosition - 1];
|
|
}
|
|
|
|
bool empty() const { return CurrentPosition == 0; }
|
|
|
|
char *getBuffer() { return Buffer; }
|
|
char *getBufferEnd() { return Buffer + CurrentPosition - 1; }
|
|
size_t getBufferCapacity() const { return BufferCapacity; }
|
|
};
|
|
|
|
template <class T> class ScopedOverride {
|
|
T &Loc;
|
|
T Original;
|
|
|
|
public:
|
|
ScopedOverride(T &Loc_) : ScopedOverride(Loc_, Loc_) {}
|
|
|
|
ScopedOverride(T &Loc_, T NewVal) : Loc(Loc_), Original(Loc_) {
|
|
Loc_ = std::move(NewVal);
|
|
}
|
|
~ScopedOverride() { Loc = std::move(Original); }
|
|
|
|
ScopedOverride(const ScopedOverride &) = delete;
|
|
ScopedOverride &operator=(const ScopedOverride &) = delete;
|
|
};
|
|
|
|
DEMANGLE_NAMESPACE_END
|
|
|
|
#endif
|