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//===-- ARMAsmPrinter.h - Print machine code to an ARM .s file --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// ARM Assembly printer class.
//
//===----------------------------------------------------------------------===//
#ifndef ARMASMPRINTER_H
#define ARMASMPRINTER_H
#include "ARM.h"
#include "ARMTargetMachine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
class MCOperand;
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;
public:
explicit ARMAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), AFI(NULL), MCP(NULL), InConstantPool(false) {
Subtarget = &TM.getSubtarget<ARMSubtarget>();
}
virtual const char *getPassName() const LLVM_OVERRIDE {
return "ARM Assembly Printer";
}
void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
const char *Modifier = 0);
virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O) LLVM_OVERRIDE;
virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O) LLVM_OVERRIDE;
void EmitJumpTable(const MachineInstr *MI);
void EmitJump2Table(const MachineInstr *MI);
virtual void EmitInstruction(const MachineInstr *MI) LLVM_OVERRIDE;
virtual bool runOnMachineFunction(MachineFunction &F) LLVM_OVERRIDE;
// @LOCALMOD-START
// usually this does nothing on ARM as constants pools
// are handled with custom code.
// For the sfi case we do not use the custom logic and fall back
// to the default implementation.
virtual void EmitConstantPool() LLVM_OVERRIDE {
if (FlagSfiDisableCP) AsmPrinter::EmitConstantPool();
}
// @LOCALMOD-END
virtual void EmitFunctionBodyEnd() LLVM_OVERRIDE;
virtual void EmitFunctionEntryLabel() LLVM_OVERRIDE;
virtual void EmitStartOfAsmFile(Module &M) LLVM_OVERRIDE;
virtual void EmitEndOfAsmFile(Module &M) LLVM_OVERRIDE;
virtual void EmitXXStructor(const Constant *CV) LLVM_OVERRIDE;
// lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
// @LOCALMOD-START
/// UseReadOnlyJumpTables - true if JumpTableInfo must be in rodata.
virtual bool UseReadOnlyJumpTables() const;
/// GetTargetBasicBlockAlign - Get the target alignment for basic blocks.
virtual unsigned GetTargetBasicBlockAlign() const;
/// GetTargetLabelAlign - Get optional alignment for TargetOpcode
/// labels E.g., EH_LABEL.
/// TODO(sehr,robertm): remove this if the labeled block has address taken.
virtual unsigned GetTargetLabelAlign(const MachineInstr *MI) const;
// @LOCALMOD-END
private:
// Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
void emitAttributes();
// Helper for ELF .o only
void emitARMAttributeSection();
// Generic helper used to emit e.g. ARMv5 mul pseudos
void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
void EmitUnwindingInstruction(const MachineInstr *MI);
// emitPseudoExpansionLowering - tblgen'erated.
bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
const MachineInstr *MI);
public:
void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
virtual MachineLocation
getDebugValueLocation(const MachineInstr *MI) const LLVM_OVERRIDE;
/// EmitDwarfRegOp - Emit dwarf register operation.
virtual void EmitDwarfRegOp(const MachineLocation &MLoc) const LLVM_OVERRIDE;
virtual unsigned getISAEncoding() LLVM_OVERRIDE {
// ARM/Darwin adds ISA to the DWARF info for each function.
if (!Subtarget->isTargetDarwin())
return 0;
return Subtarget->isThumb() ?
ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
}
private:
MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
MCSymbol *GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const;
MCSymbol *GetARMSJLJEHLabel() const;
MCSymbol *GetARMGVSymbol(const GlobalValue *GV);
public:
/// EmitMachineConstantPoolValue - Print a machine constantpool value to
/// the .s file.
virtual void
EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) LLVM_OVERRIDE;
};
} // end namespace llvm
#endif
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