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