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//===-- ARMAsmPrinter.h - ARM implementation of AsmPrinter ------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "ARMSubtarget.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Target/TargetMachine.h"
namespace llvm {
class ARMFunctionInfo;
class MCOperand;
class MachineConstantPool;
class MachineOperand;
class MCSymbol;
namespace ARM {
enum DW_ISA {
DW_ISA_ARM_thumb = 1,
DW_ISA_ARM_arm = 2
class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter {
/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
/// make the right decision when printing asm code for different targets.
const ARMSubtarget *Subtarget;
/// AFI - Keep a pointer to ARMFunctionInfo for the current
/// MachineFunction.
ARMFunctionInfo *AFI;
/// MCP - Keep a pointer to constantpool entries of the current
/// MachineFunction.
const MachineConstantPool *MCP;
/// InConstantPool - Maintain state when emitting a sequence of constant
/// pool entries so we can properly mark them as data regions.
bool InConstantPool;
/// ThumbIndirectPads - These maintain a per-function list of jump pad
/// labels used for ARMv4t thumb code to make register indirect calls.
SmallVector<std::pair<unsigned, MCSymbol*>, 4> ThumbIndirectPads;
/// OptimizationGoals - Maintain a combined optimization goal for all
/// functions in a module: one of Tag_ABI_optimization_goals values,
/// -1 if uninitialized, 0 if conflicting goals
int OptimizationGoals;
/// List of globals that have had their storage promoted to a constant
/// pool. This lives between calls to runOnMachineFunction and collects
/// data from every MachineFunction. It is used during doFinalization
/// when all non-function globals are emitted.
SmallPtrSet<const GlobalVariable*,2> PromotedGlobals;
/// Set of globals in PromotedGlobals that we've emitted labels for.
/// We need to emit labels even for promoted globals so that DWARF
/// debug info can link properly.
SmallPtrSet<const GlobalVariable*,2> EmittedPromotedGlobalLabels;
explicit ARMAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer);
StringRef getPassName() const override {
return "ARM Assembly Printer";
void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O);
void PrintSymbolOperand(const MachineOperand &MO, raw_ostream &O) override;
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
const char *ExtraCode, raw_ostream &O) override;
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
const char *ExtraCode, raw_ostream &O) override;
void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
const MCSubtargetInfo *EndInfo) const override;
void emitJumpTableAddrs(const MachineInstr *MI);
void emitJumpTableInsts(const MachineInstr *MI);
void emitJumpTableTBInst(const MachineInstr *MI, unsigned OffsetWidth);
void emitInstruction(const MachineInstr *MI) override;
bool runOnMachineFunction(MachineFunction &F) override;
std::tuple<const MCSymbol *, uint64_t, const MCSymbol *,
getCodeViewJumpTableInfo(int JTI, const MachineInstr *BranchInstr,
const MCSymbol *BranchLabel) const override;
void emitConstantPool() override {
// we emit constant pools customly!
void emitFunctionBodyEnd() override;
void emitFunctionEntryLabel() override;
void emitStartOfAsmFile(Module &M) override;
void emitEndOfAsmFile(Module &M) override;
void emitXXStructor(const DataLayout &DL, const Constant *CV) override;
void emitGlobalVariable(const GlobalVariable *GV) override;
MCSymbol *GetCPISymbol(unsigned CPID) const override;
// lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
// XRay implementation
// XRay-specific lowering for ARM.
void LowerPATCHABLE_FUNCTION_ENTER(const MachineInstr &MI);
void LowerPATCHABLE_FUNCTION_EXIT(const MachineInstr &MI);
void LowerPATCHABLE_TAIL_CALL(const MachineInstr &MI);
void EmitSled(const MachineInstr &MI, SledKind Kind);
// Helpers for emitStartOfAsmFile() and emitEndOfAsmFile()
void emitAttributes();
void EmitUnwindingInstruction(const MachineInstr *MI);
// emitPseudoExpansionLowering - tblgen'erated.
bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
const MachineInstr *MI);
unsigned getISAEncoding() override {
// ARM/Darwin adds ISA to the DWARF info for each function.
const Triple &TT = TM.getTargetTriple();
if (!TT.isOSBinFormatMachO())
return 0;
bool isThumb = TT.isThumb() ||
TT.getSubArch() == Triple::ARMSubArch_v7m ||
TT.getSubArch() == Triple::ARMSubArch_v6m;
return isThumb ? ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
MCSymbol *GetARMJTIPICJumpTableLabel(unsigned uid) const;
MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags);
/// EmitMachineConstantPoolValue - Print a machine constantpool value to
/// the .s file.
void emitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
} // end namespace llvm