92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
//===-- ARMUnwindOpAsm.h - ARM Unwind Opcodes Assembler ---------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the unwind opcode assembler for ARM exception handling
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// table.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMUNWINDOPASM_H
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#define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMUNWINDOPASM_H
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#include "llvm/ADT/SmallVector.h"
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#include <cstddef>
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#include <cstdint>
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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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SmallVector<uint8_t, 32> Ops;
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SmallVector<unsigned, 8> OpBegins;
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bool HasPersonality = false;
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public:
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UnwindOpcodeAssembler() {
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OpBegins.push_back(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.clear();
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OpBegins.clear();
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OpBegins.push_back(0);
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HasPersonality = false;
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}
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/// Set the personality
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void setPersonality(const MCSymbol *Per) {
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HasPersonality = true;
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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 to copy address from source register to $sp.
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void EmitSetSP(uint16_t Reg);
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/// Emit unwind opcodes to add $sp with an offset.
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void EmitSPOffset(int64_t Offset);
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/// Emit unwind raw opcodes
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void EmitRaw(const SmallVectorImpl<uint8_t> &Opcodes) {
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Ops.insert(Ops.end(), Opcodes.begin(), Opcodes.end());
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OpBegins.push_back(OpBegins.back() + Opcodes.size());
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}
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/// Finalize the unwind opcode sequence for emitBytes()
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void Finalize(unsigned &PersonalityIndex,
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SmallVectorImpl<uint8_t> &Result);
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private:
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void EmitInt8(unsigned Opcode) {
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Ops.push_back(Opcode & 0xff);
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OpBegins.push_back(OpBegins.back() + 1);
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}
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void EmitInt16(unsigned Opcode) {
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Ops.push_back((Opcode >> 8) & 0xff);
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Ops.push_back(Opcode & 0xff);
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OpBegins.push_back(OpBegins.back() + 2);
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}
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void emitBytes(const uint8_t *Opcode, size_t Size) {
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Ops.insert(Ops.end(), Opcode, Opcode + Size);
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OpBegins.push_back(OpBegins.back() + Size);
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}
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMUNWINDOPASM_H
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