llvm-6502/include/llvm/Support/Win64EH.h
2011-05-22 00:05:26 +00:00

101 lines
2.8 KiB
C++

//===-- llvm/Support/Win64EH.h ---Win64 EH Constants-------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains constants and structures used for implementing
// exception handling on Win64 platforms. For more information, see
// http://msdn.microsoft.com/en-us/library/1eyas8tf.aspx
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_WIN64EH_H
#define LLVM_SUPPORT_WIN64EH_H
#include "llvm/Support/DataTypes.h"
namespace llvm {
namespace Win64EH {
/// UnwindOpcodes - Enumeration whose values specify a single operation in
/// the prolog of a function.
enum UnwindOpcodes {
UOP_PushNonVol = 0,
UOP_AllocLarge,
UOP_AllocSmall,
UOP_SetFPReg,
UOP_SaveNonVol,
UOP_SaveNonVolBig,
UOP_SaveXMM128,
UOP_SaveXMM128Big,
UOP_PushMachFrame
};
/// UnwindCode - This union describes a single operation in a function prolog,
/// or part thereof.
union UnwindCode {
struct {
uint8_t codeOffset;
uint8_t unwindOp:4,
opInfo:4;
} u;
uint16_t frameOffset;
};
enum {
/// UNW_ExceptionHandler - Specifies that this function has an exception
/// handler.
UNW_ExceptionHandler = 0x01,
/// UNW_TerminateHandler - Specifies that this function has a termination
/// handler.
UNW_TerminateHandler = 0x02,
/// UNW_ChainInfo - Specifies that this UnwindInfo structure is chained to
/// another one.
UNW_ChainInfo = 0x04
};
/// RuntimeFunction - An entry in the table of functions with unwind info.
struct RuntimeFunction {
uint64_t startAddress;
uint64_t endAddress;
uint64_t unwindInfoOffset;
};
/// UnwindInfo - An entry in the exception table.
struct UnwindInfo {
uint8_t version:3,
flags:5;
uint8_t prologSize;
uint8_t numCodes;
uint8_t frameRegister:4,
frameOffset:4;
UnwindCode unwindCodes[1];
void *getLanguageSpecificData() {
return reinterpret_cast<void *>(&unwindCodes[(numCodes+1) & ~1]);
}
uint64_t getLanguageSpecificHandlerOffset() {
return *reinterpret_cast<uint64_t *>(getLanguageSpecificData());
}
void setLanguageSpecificHandlerOffset(uint64_t offset) {
*reinterpret_cast<uint64_t *>(getLanguageSpecificData()) = offset;
}
RuntimeFunction *getChainedFunctionEntry() {
return reinterpret_cast<RuntimeFunction *>(getLanguageSpecificData());
}
void *getExceptionData() {
return reinterpret_cast<void *>(reinterpret_cast<uint64_t *>(
getLanguageSpecificData())+1);
}
};
} // End of namespace Win64EH
} // End of namespace llvm
#endif