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//===-- ARMUnwindOpAsm.h - ARM Unwind Opcodes Assembler ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the unwind opcode assmebler for ARM exception handling
// table.
//
//===----------------------------------------------------------------------===//
#ifndef ARM_UNWIND_OP_ASM_H
#define ARM_UNWIND_OP_ASM_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ARMEHABI.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
class MCSymbol;
class UnwindOpcodeAssembler {
private:
llvm::SmallVector<uint8_t, 32> Ops;
llvm::SmallVector<unsigned, 8> OpBegins;
bool HasPersonality;
public:
UnwindOpcodeAssembler()
: HasPersonality(0) {
OpBegins.push_back(0);
}
/// Reset the unwind opcode assembler.
void Reset() {
Ops.clear();
OpBegins.clear();
OpBegins.push_back(0);
HasPersonality = 0;
}
/// Set the personality
void setPersonality(const MCSymbol *Per) {
HasPersonality = 1;
}
/// Emit unwind opcodes for .save directives
void EmitRegSave(uint32_t RegSave);
/// Emit unwind opcodes for .vsave directives
void EmitVFPRegSave(uint32_t VFPRegSave);
/// Emit unwind opcodes to copy address from source register to $sp.
void EmitSetSP(uint16_t Reg);
/// Emit unwind opcodes to add $sp with an offset.
void EmitSPOffset(int64_t Offset);
/// Finalize the unwind opcode sequence for EmitBytes()
void Finalize(unsigned &PersonalityIndex,
SmallVectorImpl<uint8_t> &Result);
private:
void EmitInt8(unsigned Opcode) {
Ops.push_back(Opcode & 0xff);
OpBegins.push_back(OpBegins.back() + 1);
}
void EmitInt16(unsigned Opcode) {
Ops.push_back((Opcode >> 8) & 0xff);
Ops.push_back(Opcode & 0xff);
OpBegins.push_back(OpBegins.back() + 2);
}
void EmitBytes(const uint8_t *Opcode, size_t Size) {
Ops.insert(Ops.end(), Opcode, Opcode + Size);
OpBegins.push_back(OpBegins.back() + Size);
}
};
} // namespace llvm
#endif // ARM_UNWIND_OP_ASM_H
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