llvm-6502/lib/Target/ARM/ARMAsmPrinter.h
Eric Christopher 24dded2342 Make the ARM AsmPrinter independent of global subtarget
initialization. Initialize the subtarget once per function and
migrate Emit{Start|End}OfAsmFile to either use attributes on the
TargetMachine or get information from the subtarget we'd use
for assembling. One bit (getISAEncoding) touched the general
AsmPrinter and the debug output. Handle this one by passing
the function for the subprogram down and updating all callers
and users.

The top-level-ness of the ARM attribute output for assembly is,
by nature, contrary to how we'd want to do this for an LTO
situation where we have multiple cpu architectures so this
solution is good enough for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229528 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-17 20:02:32 +00:00

131 lines
4.3 KiB
C++

//===-- ARMAsmPrinter.h - ARM implementation of AsmPrinter ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H
#define LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H
#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;
public:
explicit ARMAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer);
const char *getPassName() const override {
return "ARM Assembly / Object Emitter";
}
void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
const char *Modifier = nullptr);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O) override;
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O) override;
void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
const MCSubtargetInfo *EndInfo) const override;
void EmitJumpTable(const MachineInstr *MI);
void EmitJump2Table(const MachineInstr *MI);
void EmitInstruction(const MachineInstr *MI) override;
bool runOnMachineFunction(MachineFunction &F) 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 Constant *CV) override;
// lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
private:
// Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
void emitAttributes();
// 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:
unsigned getISAEncoding(const Function *F) override {
// ARM/Darwin adds ISA to the DWARF info for each function.
Triple TT(TM.getTargetTriple());
if (!TT.isOSBinFormatMachO())
return 0;
const ARMSubtarget &STI = TM.getSubtarget<ARMSubtarget>(F);
return STI.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, unsigned char TargetFlags);
public:
/// EmitMachineConstantPoolValue - Print a machine constantpool value to
/// the .s file.
void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
};
} // end namespace llvm
#endif