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9867c1a075
alignment of globals to the preferred alignment, but only when there is no section specified on the global (by far the common case). llvm-svn: 102515
450 lines
18 KiB
C++
450 lines
18 KiB
C++
//===-- llvm/CodeGen/AsmPrinter.h - AsmPrinter Framework --------*- 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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//
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// This file contains a class to be used as the base class for target specific
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// asm writers. This class primarily handles common functionality used by
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// all asm writers.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_ASMPRINTER_H
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#define LLVM_CODEGEN_ASMPRINTER_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/DebugLoc.h"
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namespace llvm {
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class BlockAddress;
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class GCStrategy;
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class Constant;
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class ConstantArray;
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class ConstantFP;
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class ConstantInt;
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class ConstantStruct;
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class ConstantVector;
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class GCMetadataPrinter;
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class GlobalValue;
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class GlobalVariable;
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class MachineBasicBlock;
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class MachineFunction;
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class MachineInstr;
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class MachineLocation;
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class MachineLoopInfo;
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class MachineLoop;
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class MachineConstantPool;
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class MachineConstantPoolEntry;
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class MachineConstantPoolValue;
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class MachineJumpTableInfo;
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class MachineModuleInfo;
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class MachineMove;
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class MCAsmInfo;
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class MCInst;
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class MCContext;
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class MCSection;
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class MCStreamer;
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class MCSymbol;
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class DwarfDebug;
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class DwarfException;
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class Mangler;
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class TargetLoweringObjectFile;
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class TargetData;
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class Twine;
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class Type;
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/// AsmPrinter - This class is intended to be used as a driving class for all
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/// asm writers.
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class AsmPrinter : public MachineFunctionPass {
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public:
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/// Target machine description.
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///
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TargetMachine &TM;
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/// Target Asm Printer information.
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///
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const MCAsmInfo *MAI;
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/// OutContext - This is the context for the output file that we are
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/// streaming. This owns all of the global MC-related objects for the
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/// generated translation unit.
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MCContext &OutContext;
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/// OutStreamer - This is the MCStreamer object for the file we are
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/// generating. This contains the transient state for the current
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/// translation unit that we are generating (such as the current section
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/// etc).
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MCStreamer &OutStreamer;
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/// The current machine function.
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const MachineFunction *MF;
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/// MMI - This is a pointer to the current MachineModuleInfo.
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MachineModuleInfo *MMI;
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/// Name-mangler for global names.
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///
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Mangler *Mang;
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/// The symbol for the current function. This is recalculated at the
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/// beginning of each call to runOnMachineFunction().
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///
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MCSymbol *CurrentFnSym;
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private:
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// GCMetadataPrinters - The garbage collection metadata printer table.
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void *GCMetadataPrinters; // Really a DenseMap.
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/// VerboseAsm - Emit comments in assembly output if this is true.
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///
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bool VerboseAsm;
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static char ID;
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/// If VerboseAsm is set, a pointer to the loop info for this
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/// function.
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MachineLoopInfo *LI;
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/// DD - If the target supports dwarf debug info, this pointer is non-null.
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DwarfDebug *DD;
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/// DE - If the target supports dwarf exception info, this pointer is
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/// non-null.
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DwarfException *DE;
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protected:
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explicit AsmPrinter(TargetMachine &TM, MCStreamer &Streamer);
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public:
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virtual ~AsmPrinter();
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/// isVerbose - Return true if assembly output should contain comments.
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///
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bool isVerbose() const { return VerboseAsm; }
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/// getFunctionNumber - Return a unique ID for the current function.
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///
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unsigned getFunctionNumber() const;
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/// getObjFileLowering - Return information about object file lowering.
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const TargetLoweringObjectFile &getObjFileLowering() const;
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/// getTargetData - Return information about data layout.
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const TargetData &getTargetData() const;
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/// getCurrentSection() - Return the current section we are emitting to.
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const MCSection *getCurrentSection() const;
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//===------------------------------------------------------------------===//
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// MachineFunctionPass Implementation.
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//===------------------------------------------------------------------===//
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/// getAnalysisUsage - Record analysis usage.
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///
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void getAnalysisUsage(AnalysisUsage &AU) const;
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/// doInitialization - Set up the AsmPrinter when we are working on a new
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/// module. If your pass overrides this, it must make sure to explicitly
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/// call this implementation.
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bool doInitialization(Module &M);
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/// doFinalization - Shut down the asmprinter. If you override this in your
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/// pass, you must make sure to call it explicitly.
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bool doFinalization(Module &M);
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/// runOnMachineFunction - Emit the specified function out to the
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/// OutStreamer.
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virtual bool runOnMachineFunction(MachineFunction &MF) {
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SetupMachineFunction(MF);
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EmitFunctionHeader();
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EmitFunctionBody();
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return false;
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}
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//===------------------------------------------------------------------===//
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// Coarse grained IR lowering routines.
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//===------------------------------------------------------------------===//
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/// SetupMachineFunction - This should be called when a new MachineFunction
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/// is being processed from runOnMachineFunction.
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void SetupMachineFunction(MachineFunction &MF);
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/// EmitFunctionHeader - This method emits the header for the current
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/// function.
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void EmitFunctionHeader();
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/// EmitFunctionBody - This method emits the body and trailer for a
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/// function.
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void EmitFunctionBody();
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/// EmitConstantPool - Print to the current output stream assembly
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/// representations of the constants in the constant pool MCP. This is
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/// used to print out constants which have been "spilled to memory" by
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/// the code generator.
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///
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virtual void EmitConstantPool();
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/// EmitJumpTableInfo - Print assembly representations of the jump tables
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/// used by the current function to the current output stream.
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///
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void EmitJumpTableInfo();
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/// EmitGlobalVariable - Emit the specified global variable to the .s file.
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virtual void EmitGlobalVariable(const GlobalVariable *GV);
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/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
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/// special global used by LLVM. If so, emit it and return true, otherwise
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/// do nothing and return false.
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bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
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/// EmitAlignment - Emit an alignment directive to the specified power of
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/// two boundary. For example, if you pass in 3 here, you will get an 8
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/// byte alignment. If a global value is specified, and if that global has
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/// an explicit alignment requested, it will override the alignment request
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/// if required for correctness.
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///
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void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0) const;
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/// EmitBasicBlockStart - This method prints the label for the specified
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/// MachineBasicBlock, an alignment (if present) and a comment describing
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/// it if appropriate.
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void EmitBasicBlockStart(const MachineBasicBlock *MBB) const;
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/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
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void EmitGlobalConstant(const Constant *CV, unsigned AddrSpace = 0);
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//===------------------------------------------------------------------===//
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// Overridable Hooks
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//===------------------------------------------------------------------===//
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// Targets can, or in the case of EmitInstruction, must implement these to
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// customize output.
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/// EmitStartOfAsmFile - This virtual method can be overridden by targets
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/// that want to emit something at the start of their file.
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virtual void EmitStartOfAsmFile(Module &) {}
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/// EmitEndOfAsmFile - This virtual method can be overridden by targets that
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/// want to emit something at the end of their file.
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virtual void EmitEndOfAsmFile(Module &) {}
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/// EmitFunctionBodyStart - Targets can override this to emit stuff before
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/// the first basic block in the function.
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virtual void EmitFunctionBodyStart() {}
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/// EmitFunctionBodyEnd - Targets can override this to emit stuff after
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/// the last basic block in the function.
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virtual void EmitFunctionBodyEnd() {}
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/// EmitInstruction - Targets should implement this to emit instructions.
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virtual void EmitInstruction(const MachineInstr *) {
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assert(0 && "EmitInstruction not implemented");
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}
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virtual void EmitFunctionEntryLabel();
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virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
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/// isBlockOnlyReachableByFallthough - Return true if the basic block has
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/// exactly one predecessor and the control transfer mechanism between
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/// the predecessor and this block is a fall-through.
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virtual bool
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isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
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//===------------------------------------------------------------------===//
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// Symbol Lowering Routines.
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//===------------------------------------------------------------------===//
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public:
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/// GetTempSymbol - Return the MCSymbol corresponding to the assembler
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/// temporary label with the specified stem and unique ID.
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MCSymbol *GetTempSymbol(StringRef Name, unsigned ID) const;
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/// GetTempSymbol - Return an assembler temporary label with the specified
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/// stem.
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MCSymbol *GetTempSymbol(StringRef Name) const;
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/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
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/// global value name as its base, with the specified suffix, and where the
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/// symbol is forced to have private linkage if ForcePrivate is true.
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MCSymbol *GetSymbolWithGlobalValueBase(const GlobalValue *GV,
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StringRef Suffix,
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bool ForcePrivate = true) const;
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/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
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/// ExternalSymbol.
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MCSymbol *GetExternalSymbolSymbol(StringRef Sym) const;
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/// GetCPISymbol - Return the symbol for the specified constant pool entry.
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MCSymbol *GetCPISymbol(unsigned CPID) const;
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/// GetJTISymbol - Return the symbol for the specified jump table entry.
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MCSymbol *GetJTISymbol(unsigned JTID, bool isLinkerPrivate = false) const;
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/// GetJTSetSymbol - Return the symbol for the specified jump table .set
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/// FIXME: privatize to AsmPrinter.
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MCSymbol *GetJTSetSymbol(unsigned UID, unsigned MBBID) const;
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/// GetBlockAddressSymbol - Return the MCSymbol used to satisfy BlockAddress
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/// uses of the specified basic block.
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MCSymbol *GetBlockAddressSymbol(const BlockAddress *BA) const;
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MCSymbol *GetBlockAddressSymbol(const BasicBlock *BB) const;
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//===------------------------------------------------------------------===//
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// Emission Helper Routines.
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//===------------------------------------------------------------------===//
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public:
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/// printOffset - This is just convenient handler for printing offsets.
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void printOffset(int64_t Offset, raw_ostream &OS) const;
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/// EmitInt8 - Emit a byte directive and value.
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///
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void EmitInt8(int Value) const;
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/// EmitInt16 - Emit a short directive and value.
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///
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void EmitInt16(int Value) const;
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/// EmitInt32 - Emit a long directive and value.
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///
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void EmitInt32(int Value) const;
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/// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
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/// in bytes of the directive is specified by Size and Hi/Lo specify the
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/// labels. This implicitly uses .set if it is available.
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void EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
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unsigned Size) const;
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/// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
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/// where the size in bytes of the directive is specified by Size and Hi/Lo
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/// specify the labels. This implicitly uses .set if it is available.
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void EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
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const MCSymbol *Lo, unsigned Size) const;
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//===------------------------------------------------------------------===//
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// Dwarf Emission Helper Routines
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//===------------------------------------------------------------------===//
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/// EmitSLEB128 - emit the specified signed leb128 value.
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void EmitSLEB128(int Value, const char *Desc = 0) const;
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/// EmitULEB128 - emit the specified unsigned leb128 value.
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void EmitULEB128(unsigned Value, const char *Desc = 0,
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unsigned PadTo = 0) const;
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/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
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void EmitCFAByte(unsigned Val) const;
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/// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
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/// encoding. If verbose assembly output is enabled, we output comments
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/// describing the encoding. Desc is a string saying what the encoding is
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/// specifying (e.g. "LSDA").
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void EmitEncodingByte(unsigned Val, const char *Desc = 0) const;
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/// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
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unsigned GetSizeOfEncodedValue(unsigned Encoding) const;
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/// EmitReference - Emit a reference to a label with a specified encoding.
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///
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void EmitReference(const MCSymbol *Sym, unsigned Encoding) const;
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void EmitReference(const GlobalValue *GV, unsigned Encoding) const;
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/// EmitSectionOffset - Emit the 4-byte offset of Label from the start of
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/// its section. This can be done with a special directive if the target
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/// supports it (e.g. cygwin) or by emitting it as an offset from a label at
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/// the start of the section.
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///
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/// SectionLabel is a temporary label emitted at the start of the section
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/// that Label lives in.
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void EmitSectionOffset(const MCSymbol *Label,
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const MCSymbol *SectionLabel) const;
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/// getDebugValueLocation - Get location information encoded by DBG_VALUE
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/// operands.
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virtual MachineLocation getDebugValueLocation(const MachineInstr *MI) const;
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//===------------------------------------------------------------------===//
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// Dwarf Lowering Routines
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//===------------------------------------------------------------------===//
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/// EmitFrameMoves - Emit frame instructions to describe the layout of the
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/// frame.
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void EmitFrameMoves(const std::vector<MachineMove> &Moves,
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MCSymbol *BaseLabel, bool isEH) const;
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//===------------------------------------------------------------------===//
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// Inline Asm Support
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//===------------------------------------------------------------------===//
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public:
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// These are hooks that targets can override to implement inline asm
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// support. These should probably be moved out of AsmPrinter someday.
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/// PrintSpecial - Print information related to the specified machine instr
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/// that is independent of the operand, and may be independent of the instr
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/// itself. This can be useful for portably encoding the comment character
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/// or other bits of target-specific knowledge into the asmstrings. The
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/// syntax used is ${:comment}. Targets can override this to add support
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/// for their own strange codes.
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virtual void PrintSpecial(const MachineInstr *MI, raw_ostream &OS,
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const char *Code) const;
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/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
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/// instruction, using the specified assembler variant. Targets should
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/// override this to format as appropriate. This method can return true if
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/// the operand is erroneous.
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virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &OS);
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/// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
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/// instruction, using the specified assembler variant as an address.
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/// Targets should override this to format as appropriate. This method can
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/// return true if the operand is erroneous.
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virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode,
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raw_ostream &OS);
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private:
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/// Private state for PrintSpecial()
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// Assign a unique ID to this machine instruction.
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mutable const MachineInstr *LastMI;
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mutable unsigned LastFn;
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mutable unsigned Counter;
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mutable unsigned SetCounter;
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/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
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void EmitInlineAsm(StringRef Str, unsigned LocCookie) const;
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/// EmitInlineAsm - This method formats and emits the specified machine
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/// instruction that is an inline asm.
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void EmitInlineAsm(const MachineInstr *MI) const;
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//===------------------------------------------------------------------===//
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// Internal Implementation Details
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//===------------------------------------------------------------------===//
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/// EmitVisibility - This emits visibility information about symbol, if
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/// this is suported by the target.
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void EmitVisibility(MCSymbol *Sym, unsigned Visibility) const;
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void EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const;
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void EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
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const MachineBasicBlock *MBB,
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unsigned uid) const;
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void EmitLLVMUsedList(Constant *List);
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void EmitXXStructorList(Constant *List);
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GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);
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};
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}
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#endif
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