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