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9962fd0e2e
Previously, they were forced to immediately follow the actual branch instruction. This was usually OK (the LEAs actually accessing them got emitted nearby, and weren't usually separated much afterwards). Unfortunately, a sufficiently nasty phi elimination dumps many instructions right before the basic block terminator, and this can increase the range too much. This patch frees them up to be placed as usual by the constant islands pass, and consequently has to slightly modify the form of TBB/TBH tables to refer to a PC-relative label at the final jump. The other jump table formats were already position-independent. rdar://20813304 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237590 91177308-0d34-0410-b5e6-96231b3b80d8
134 lines
4.5 KiB
C++
134 lines
4.5 KiB
C++
//===-- ARMAsmPrinter.h - ARM implementation of AsmPrinter ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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public:
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explicit ARMAsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer);
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const char *getPassName() const override {
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return "ARM Assembly / Object Emitter";
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}
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void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &O) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
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unsigned AsmVariant, const char *ExtraCode,
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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 Constant *CV) 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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private:
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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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Triple TT(TM.getTargetTriple());
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if (!TT.isOSBinFormatMachO())
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return 0;
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bool isThumb = TT.getArch() == Triple::thumb ||
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TT.getArch() == Triple::thumbeb ||
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TT.getSubArch() == Triple::ARMSubArch_v7m ||
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TT.getSubArch() == Triple::ARMSubArch_v6m;
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return isThumb ? ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
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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 *GetARMSJLJEHLabel() 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
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