path: root/lib/CodeGen/CGException.cpp

//===--- CGException.cpp - Emit LLVM Code for C++ exceptions --------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code dealing with C++ exception related code generation.
//
//===----------------------------------------------------------------------===//

#include "clang/AST/StmtCXX.h"

#include "llvm/Intrinsics.h"
#include "llvm/Support/CallSite.h"

#include "CodeGenFunction.h"
#include "CGException.h"

using namespace clang;
using namespace CodeGen;

/// Push an entry of the given size onto this protected-scope stack.
char *EHScopeStack::allocate(size_t Size) {
  if (!StartOfBuffer) {
    unsigned Capacity = 1024;
    while (Capacity < Size) Capacity *= 2;
    StartOfBuffer = new char[Capacity];
    StartOfData = EndOfBuffer = StartOfBuffer + Capacity;
  } else if (static_cast<size_t>(StartOfData - StartOfBuffer) < Size) {
    unsigned CurrentCapacity = EndOfBuffer - StartOfBuffer;
    unsigned UsedCapacity = CurrentCapacity - (StartOfData - StartOfBuffer);

    unsigned NewCapacity = CurrentCapacity;
    do {
      NewCapacity *= 2;
    } while (NewCapacity < UsedCapacity + Size);

    char *NewStartOfBuffer = new char[NewCapacity];
    char *NewEndOfBuffer = NewStartOfBuffer + NewCapacity;
    char