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https://github.com/c64scene-ar/llvm-6502.git
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532854d7ab
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179591 91177308-0d34-0410-b5e6-96231b3b80d8
115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
//===-- ARMUnwindOpAsm.h - ARM Unwind Opcodes Assembler ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the unwind opcode assmebler for ARM exception handling
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// table.
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//
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//===----------------------------------------------------------------------===//
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#ifndef ARM_UNWIND_OP_ASM_H
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#define ARM_UNWIND_OP_ASM_H
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#include "ARMUnwindOp.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class MCSymbol;
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class UnwindOpcodeAssembler {
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private:
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llvm::SmallVector<uint8_t, 8> Ops;
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unsigned Offset;
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unsigned PersonalityIndex;
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bool HasPersonality;
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enum {
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// The number of bytes to be preserved for the size and personality index
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// prefix of unwind opcodes.
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NUM_PRESERVED_PREFIX_BUF = 2
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};
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public:
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UnwindOpcodeAssembler()
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: Ops(NUM_PRESERVED_PREFIX_BUF), Offset(NUM_PRESERVED_PREFIX_BUF),
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PersonalityIndex(NUM_PERSONALITY_INDEX), HasPersonality(0) {
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}
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/// Reset the unwind opcode assembler.
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void Reset() {
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Ops.resize(NUM_PRESERVED_PREFIX_BUF);
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Offset = NUM_PRESERVED_PREFIX_BUF;
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PersonalityIndex = NUM_PERSONALITY_INDEX;
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HasPersonality = 0;
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}
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/// Get the size of the payload (including the size byte)
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size_t size() const {
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return Ops.size() - Offset;
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}
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/// Get the beginning of the payload
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const uint8_t *begin() const {
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return Ops.begin() + Offset;
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}
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/// Get the payload
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StringRef data() const {
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return StringRef(reinterpret_cast<const char *>(begin()), size());
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}
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/// Set the personality index
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void setPersonality(const MCSymbol *Per) {
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HasPersonality = 1;
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}
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/// Get the personality index
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unsigned getPersonalityIndex() const {
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return PersonalityIndex;
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}
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/// Emit unwind opcodes for .save directives
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void EmitRegSave(uint32_t RegSave);
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/// Emit unwind opcodes for .vsave directives
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void EmitVFPRegSave(uint32_t VFPRegSave);
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/// Emit unwind opcodes for .setfp directives
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void EmitSetFP(uint16_t FPReg);
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/// Emit unwind opcodes to update stack pointer
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void EmitSPOffset(int64_t Offset);
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/// Finalize the unwind opcode sequence for EmitBytes()
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void Finalize();
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private:
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/// Get the size of the opcodes in bytes.
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size_t getOpcodeSize() const {
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return Ops.size() - NUM_PRESERVED_PREFIX_BUF;
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}
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/// Add the length prefix to the payload
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void AddOpcodeSizePrefix(size_t Pos);
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/// Add personality index prefix in some compact format
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void AddPersonalityIndexPrefix(size_t Pos, unsigned PersonalityIndex);
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/// Fill the words with finish opcode if it is not aligned
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void EmitFinishOpcodes();
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};
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} // namespace llvm
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#endif // ARM_UNWIND_OP_ASM_H
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