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| //===-- AArch64WinCOFFStreamer.cpp - ARM Target WinCOFF Streamer ----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "AArch64WinCOFFStreamer.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCWin64EH.h"
#include "llvm/MC/MCWinCOFFStreamer.h"
using namespace llvm;
namespace {
class AArch64WinCOFFStreamer : public MCWinCOFFStreamer {
Win64EH::ARM64UnwindEmitter EHStreamer;
public:
AArch64WinCOFFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> AB,
std::unique_ptr<MCCodeEmitter> CE,
std::unique_ptr<MCObjectWriter> OW)
: MCWinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW)) {}
void EmitWinEHHandlerData(SMLoc Loc) override;
void EmitWindowsUnwindTables() override;
void FinishImpl() override;
};
void AArch64WinCOFFStreamer::EmitWinEHHandlerData(SMLoc Loc) {
MCStreamer::EmitWinEHHandlerData(Loc);
// We have to emit the unwind info now, because this directive
// actually switches to the .xdata section!
EHStreamer.EmitUnwindInfo(*this, getCurrentWinFrameInfo());
}
void AArch64WinCOFFStreamer::EmitWindowsUnwindTables() {
if (!getNumWinFrameInfos())
return;
EHStreamer.Emit(*this);
}
void AArch64WinCOFFStreamer::FinishImpl() {
EmitFrames(nullptr);
EmitWindowsUnwindTables();
MCWinCOFFStreamer::FinishImpl();
}
} // end anonymous namespace
namespace llvm {
// Helper function to common out unwind code setup for those codes that can
// belong to both prolog and epilog.
// There are three types of Windows ARM64 SEH codes. They can
// 1) take no operands: SEH_Nop, SEH_PrologEnd, SEH_EpilogStart, SEH_EpilogEnd
// 2) take an offset: SEH_StackAlloc, SEH_SaveFPLR, SEH_SaveFPLR_X
// 3) take a register and an offset/size: all others
void AArch64TargetWinCOFFStreamer::EmitARM64WinUnwindCode(unsigned UnwindCode,
int Reg,
int Offset) {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
MCSymbol *Label = S.EmitCFILabel();
auto Inst = WinEH::Instruction(UnwindCode, Label, Reg, Offset);
if (InEpilogCFI)
CurFrame->EpilogMap[CurrentEpilog].push_back(Inst);
else
CurFrame->Instructions.push_back(Inst);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIAllocStack(unsigned Size) {
unsigned Op = Win64EH::UOP_AllocSmall;
if (Size >= 16384)
Op = Win64EH::UOP_AllocLarge;
else if (Size >= 512)
Op = Win64EH::UOP_AllocMedium;
EmitARM64WinUnwindCode(Op, -1, Size);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFPLR(int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFPLR, -1, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFPLRX(int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFPLRX, -1, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveReg(unsigned Reg,
int Offset) {
assert(Offset >= 0 && Offset <= 504 &&
"Offset for save reg should be >= 0 && <= 504");
EmitARM64WinUnwindCode(Win64EH::UOP_SaveReg, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveRegX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveRegX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveRegP(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveRegP, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveRegPX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveRegPX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFReg(unsigned Reg,
int Offset) {
assert(Offset >= 0 && Offset <= 504 &&
"Offset for save reg should be >= 0 && <= 504");
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFReg, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFRegX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFRegX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFRegP(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFRegP, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFRegPX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFRegPX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISetFP() {
EmitARM64WinUnwindCode(Win64EH::UOP_SetFP, -1, 0);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIAddFP(unsigned Offset) {
assert(Offset <= 2040 && "UOP_AddFP must have offset <= 2040");
EmitARM64WinUnwindCode(Win64EH::UOP_AddFP, -1, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFINop() {
EmitARM64WinUnwindCode(Win64EH::UOP_Nop, -1, 0);
}
// The functions below handle opcodes that can end up in either a prolog or
// an epilog, but not both.
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIPrologEnd() {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
MCSymbol *Label = S.EmitCFILabel();
CurFrame->PrologEnd = Label;
WinEH::Instruction Inst = WinEH::Instruction(Win64EH::UOP_End, Label, -1, 0);
auto it = CurFrame->Instructions.begin();
CurFrame->Instructions.insert(it, Inst);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIEpilogStart() {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
InEpilogCFI = true;
CurrentEpilog = S.EmitCFILabel();
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIEpilogEnd() {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
InEpilogCFI = false;
MCSymbol *Label = S.EmitCFILabel();
WinEH::Instruction Inst = WinEH::Instruction(Win64EH::UOP_End, Label, -1, 0);
CurFrame->EpilogMap[CurrentEpilog].push_back(Inst);
CurrentEpilog = nullptr;
}
MCWinCOFFStreamer *createAArch64WinCOFFStreamer(
MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter,
bool RelaxAll, bool IncrementalLinkerCompatible) {
auto *S = new AArch64WinCOFFStreamer(Context, std::move(MAB),
std::move(Emitter), std::move(OW));
S->getAssembler().setIncrementalLinkerCompatible(IncrementalLinkerCompatible);
return S;
}
} // end llvm namespace
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