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-rw-r--r--externals/demangle/llvm/Demangle/Utility.h208
1 files changed, 111 insertions, 97 deletions
diff --git a/externals/demangle/llvm/Demangle/Utility.h b/externals/demangle/llvm/Demangle/Utility.h
index 50d05c6b1..30dfbfc8d 100644
--- a/externals/demangle/llvm/Demangle/Utility.h
+++ b/externals/demangle/llvm/Demangle/Utility.h
@@ -1,5 +1,5 @@
-//===--- Utility.h ----------------------------------------------*- 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
@@ -7,70 +7,83 @@
//
//===----------------------------------------------------------------------===//
//
-// Provide some utility classes for use in the demangler(s).
+// 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 "StringView.h"
+#include "DemangleConfig.h"
+
+#include <array>
+#include <cassert>
#include <cstdint>
#include <cstdlib>
#include <cstring>
-#include <iterator>
+#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 OutputStream {
- char *Buffer;
- size_t CurrentPosition;
- size_t BufferCapacity;
+class OutputBuffer {
+ char *Buffer = nullptr;
+ size_t CurrentPosition = 0;
+ size_t BufferCapacity = 0;
- // Ensure there is at least n more positions in buffer.
+ // Ensure there are at least N more positions in the buffer.
void grow(size_t N) {
- if (N + CurrentPosition >= BufferCapacity) {
+ 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 < N + CurrentPosition)
- BufferCapacity = N + CurrentPosition;
+ if (BufferCapacity < Need)
+ BufferCapacity = Need;
Buffer = static_cast<char *>(std::realloc(Buffer, BufferCapacity));
if (Buffer == nullptr)
std::terminate();
}
}
- void writeUnsigned(uint64_t N, bool isNeg = false) {
- // Handle special case...
- if (N == 0) {
- *this << '0';
- return;
- }
-
- char Temp[21];
- char *TempPtr = std::end(Temp);
+ OutputBuffer &writeUnsigned(uint64_t N, bool isNeg = false) {
+ std::array<char, 21> Temp;
+ char *TempPtr = Temp.data() + Temp.size();
- while (N) {
- *--TempPtr = '0' + char(N % 10);
+ // Output at least one character.
+ do {
+ *--TempPtr = char('0' + N % 10);
N /= 10;
- }
+ } while (N);
- // Add negative sign...
+ // Add negative sign.
if (isNeg)
*--TempPtr = '-';
- this->operator<<(StringView(TempPtr, std::end(Temp)));
+
+ return operator+=(
+ std::string_view(TempPtr, Temp.data() + Temp.size() - TempPtr));
}
public:
- OutputStream(char *StartBuf, size_t Size)
- : Buffer(StartBuf), CurrentPosition(0), BufferCapacity(Size) {}
- OutputStream() = default;
- void reset(char *Buffer_, size_t BufferCapacity_) {
- CurrentPosition = 0;
- Buffer = Buffer_;
- BufferCapacity = BufferCapacity_;
+ 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
@@ -78,115 +91,116 @@ public:
unsigned CurrentPackIndex = std::numeric_limits<unsigned>::max();
unsigned CurrentPackMax = std::numeric_limits<unsigned>::max();
- OutputStream &operator+=(StringView R) {
- size_t Size = R.size();
- if (Size == 0)
- return *this;
- grow(Size);
- std::memmove(Buffer + CurrentPosition, R.begin(), Size);
- CurrentPosition += Size;
+ /// 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;
}
- OutputStream &operator+=(char C) {
+ OutputBuffer &operator+=(char C) {
grow(1);
Buffer[CurrentPosition++] = C;
return *this;
}
- OutputStream &operator<<(StringView R) { return (*this += R); }
+ OutputBuffer &prepend(std::string_view R) {
+ size_t Size = R.size();
- OutputStream &operator<<(char C) { return (*this += C); }
+ grow(Size);
+ std::memmove(Buffer + Size, Buffer, CurrentPosition);
+ std::memcpy(Buffer, &*R.begin(), Size);
+ CurrentPosition += Size;
- OutputStream &operator<<(long long N) {
- if (N < 0)
- writeUnsigned(static_cast<unsigned long long>(-N), true);
- else
- writeUnsigned(static_cast<unsigned long long>(N));
return *this;
}
- OutputStream &operator<<(unsigned long long N) {
- writeUnsigned(N, false);
- 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);
}
- OutputStream &operator<<(long N) {
+ OutputBuffer &operator<<(unsigned long long N) {
+ return writeUnsigned(N, false);
+ }
+
+ OutputBuffer &operator<<(long N) {
return this->operator<<(static_cast<long long>(N));
}
- OutputStream &operator<<(unsigned long N) {
+ OutputBuffer &operator<<(unsigned long N) {
return this->operator<<(static_cast<unsigned long long>(N));
}
- OutputStream &operator<<(int N) {
+ OutputBuffer &operator<<(int N) {
return this->operator<<(static_cast<long long>(N));
}
- OutputStream &operator<<(unsigned int 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 {
- return CurrentPosition ? Buffer[CurrentPosition - 1] : '\0';
+ 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() { return BufferCapacity; }
+ size_t getBufferCapacity() const { return BufferCapacity; }
};
-template <class T> class SwapAndRestore {
- T &Restore;
- T OriginalValue;
- bool ShouldRestore = true;
+template <class T> class ScopedOverride {
+ T &Loc;
+ T Original;
public:
- SwapAndRestore(T &Restore_) : SwapAndRestore(Restore_, Restore_) {}
-
- SwapAndRestore(T &Restore_, T NewVal)
- : Restore(Restore_), OriginalValue(Restore) {
- Restore = std::move(NewVal);
- }
- ~SwapAndRestore() {
- if (ShouldRestore)
- Restore = std::move(OriginalValue);
- }
+ ScopedOverride(T &Loc_) : ScopedOverride(Loc_, Loc_) {}
- void shouldRestore(bool ShouldRestore_) { ShouldRestore = ShouldRestore_; }
-
- void restoreNow(bool Force) {
- if (!Force && !ShouldRestore)
- return;
-
- Restore = std::move(OriginalValue);
- ShouldRestore = false;
+ ScopedOverride(T &Loc_, T NewVal) : Loc(Loc_), Original(Loc_) {
+ Loc_ = std::move(NewVal);
}
+ ~ScopedOverride() { Loc = std::move(Original); }
- SwapAndRestore(const SwapAndRestore &) = delete;
- SwapAndRestore &operator=(const SwapAndRestore &) = delete;
+ ScopedOverride(const ScopedOverride &) = delete;
+ ScopedOverride &operator=(const ScopedOverride &) = delete;
};
-inline bool initializeOutputStream(char *Buf, size_t *N, OutputStream &S,
- size_t InitSize) {
- size_t BufferSize;
- if (Buf == nullptr) {
- Buf = static_cast<char *>(std::malloc(InitSize));
- if (Buf == nullptr)
- return false;
- BufferSize = InitSize;
- } else
- BufferSize = *N;
-
- S.reset(Buf, BufferSize);
- return true;
-}
-
DEMANGLE_NAMESPACE_END
#endif