Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/Target/ARM/ARMAsmPrinter.h
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//===-- ARMAsmPrinter.h - ARM implementation of AsmPrinter ------*- 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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#ifndef LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H
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#define LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H
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#include "ARMSubtarget.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class ARMFunctionInfo;
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class MCOperand;
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class MachineConstantPool;
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class MachineOperand;
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class MCSymbol;
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namespace ARM {
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  enum DW_ISA {
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    DW_ISA_ARM_thumb = 1,
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    DW_ISA_ARM_arm = 2
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  };
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}
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class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter {
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  /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
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  /// make the right decision when printing asm code for different targets.
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  const ARMSubtarget *Subtarget;
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  /// AFI - Keep a pointer to ARMFunctionInfo for the current
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  /// MachineFunction.
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  ARMFunctionInfo *AFI;
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  /// MCP - Keep a pointer to constantpool entries of the current
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  /// MachineFunction.
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  const MachineConstantPool *MCP;
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  /// InConstantPool - Maintain state when emitting a sequence of constant
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  /// pool entries so we can properly mark them as data regions.
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  bool InConstantPool;
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  /// ThumbIndirectPads - These maintain a per-function list of jump pad
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  /// labels used for ARMv4t thumb code to make register indirect calls.
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  SmallVector<std::pair<unsigned, MCSymbol*>, 4> ThumbIndirectPads;
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  /// OptimizationGoals - Maintain a combined optimization goal for all
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  /// functions in a module: one of Tag_ABI_optimization_goals values,
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  /// -1 if uninitialized, 0 if conflicting goals
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  int OptimizationGoals;
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  /// List of globals that have had their storage promoted to a constant
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  /// pool. This lives between calls to runOnMachineFunction and collects
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  /// data from every MachineFunction. It is used during doFinalization
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  /// when all non-function globals are emitted.
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  SmallPtrSet<const GlobalVariable*,2> PromotedGlobals;
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  /// Set of globals in PromotedGlobals that we've emitted labels for.
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  /// We need to emit labels even for promoted globals so that DWARF
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  /// debug info can link properly.
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  SmallPtrSet<const GlobalVariable*,2> EmittedPromotedGlobalLabels;
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public:
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  explicit ARMAsmPrinter(TargetMachine &TM,
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                         std::unique_ptr<MCStreamer> Streamer);
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  StringRef getPassName() const override {
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    return "ARM Assembly Printer";
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  }
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  void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O);
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  void PrintSymbolOperand(const MachineOperand &MO, raw_ostream &O) override;
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  bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
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                       const char *ExtraCode, raw_ostream &O) override;
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  bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
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                             const char *ExtraCode, raw_ostream &O) override;
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  void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
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                        const MCSubtargetInfo *EndInfo) const override;
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  void EmitJumpTableAddrs(const MachineInstr *MI);
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  void EmitJumpTableInsts(const MachineInstr *MI);
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  void EmitJumpTableTBInst(const MachineInstr *MI, unsigned OffsetWidth);
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  void EmitInstruction(const MachineInstr *MI) override;
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  bool runOnMachineFunction(MachineFunction &F) override;
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  void EmitConstantPool() override {
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    // we emit constant pools customly!
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  }
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  void EmitFunctionBodyEnd() override;
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  void EmitFunctionEntryLabel() override;
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  void EmitStartOfAsmFile(Module &M) override;
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  void EmitEndOfAsmFile(Module &M) override;
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  void EmitXXStructor(const DataLayout &DL, const Constant *CV) override;
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  void EmitGlobalVariable(const GlobalVariable *GV) override;
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  MCSymbol *GetCPISymbol(unsigned CPID) const override;
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  // lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
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  bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
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  //===------------------------------------------------------------------===//
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  // XRay implementation
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  //===------------------------------------------------------------------===//
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public:
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  // XRay-specific lowering for ARM.
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  void LowerPATCHABLE_FUNCTION_ENTER(const MachineInstr &MI);
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  void LowerPATCHABLE_FUNCTION_EXIT(const MachineInstr &MI);
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  void LowerPATCHABLE_TAIL_CALL(const MachineInstr &MI);
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private:
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  void EmitSled(const MachineInstr &MI, SledKind Kind);
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  // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
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  void emitAttributes();
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  // Generic helper used to emit e.g. ARMv5 mul pseudos
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  void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
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  void EmitUnwindingInstruction(const MachineInstr *MI);
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  // emitPseudoExpansionLowering - tblgen'erated.
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  bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
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                                   const MachineInstr *MI);
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public:
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  unsigned getISAEncoding() override {
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    // ARM/Darwin adds ISA to the DWARF info for each function.
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    const Triple &TT = TM.getTargetTriple();
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    if (!TT.isOSBinFormatMachO())
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      return 0;
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    bool isThumb = TT.isThumb() ||
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TT.getSubArch() == Triple::ARMSubArch_v7m8
||
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TT.getSubArch() == Triple::ARMSubArch_v6m8
;
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    return isThumb ? 
ARM::DW_ISA_ARM_thumb42
:
ARM::DW_ISA_ARM_arm8
;
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  }
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private:
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  MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
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  MCSymbol *GetARMJTIPICJumpTableLabel(unsigned uid) const;
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  MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags);
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public:
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  /// EmitMachineConstantPoolValue - Print a machine constantpool value to
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  /// the .s file.
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  void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
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};
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} // end namespace llvm
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#endif