#define LLVM_CODEGEN_ASMPRINTER_H
#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/Support/DebugLoc.h"
+#include "llvm/InlineAsm.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorHandling.h"
namespace llvm {
class BlockAddress;
class GCStrategy;
class Constant;
- class ConstantArray;
- class ConstantFP;
- class ConstantInt;
- class ConstantStruct;
- class ConstantVector;
class GCMetadataPrinter;
class GlobalValue;
class GlobalVariable;
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
+ class MachineLocation;
class MachineLoopInfo;
class MachineLoop;
- class MachineConstantPool;
- class MachineConstantPoolEntry;
class MachineConstantPoolValue;
class MachineJumpTableInfo;
class MachineModuleInfo;
- class MCInst;
+ class MachineMove;
+ class MCAsmInfo;
class MCContext;
class MCSection;
class MCStreamer;
class MCSymbol;
- class DwarfWriter;
+ class MDNode;
+ class DwarfDebug;
+ class DwarfException;
class Mangler;
- class MCAsmInfo;
class TargetLoweringObjectFile;
- class Twine;
- class Type;
+ class DataLayout;
+ class TargetMachine;
/// AsmPrinter - This class is intended to be used as a driving class for all
/// asm writers.
class AsmPrinter : public MachineFunctionPass {
- static char ID;
-
- /// If VerboseAsm is set, a pointer to the loop info for this
- /// function.
- ///
- MachineLoopInfo *LI;
-
- protected:
- /// DW - If available, this is a pointer to the current dwarf writer.
- DwarfWriter *DW;
-
public:
-
/// Target machine description.
///
TargetMachine &TM;
-
+
/// Target Asm Printer information.
///
const MCAsmInfo *MAI;
/// 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;
/// beginning of each call to runOnMachineFunction().
///
MCSymbol *CurrentFnSym;
-
- /// VerboseAsm - Emit comments in assembly output if this is true.
- ///
- bool VerboseAsm;
- /// getObjFileLowering - Return information about object file lowering.
- TargetLoweringObjectFile &getObjFileLowering() const;
-
- /// getCurrentSection() - Return the current section we are emitting to.
- const MCSection *getCurrentSection() const;
-
+ /// 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();
/// getFunctionNumber - Return a unique ID for the current function.
///
unsigned getFunctionNumber() const;
-
+
+ /// getObjFileLowering - Return information about object file lowering.
+ const TargetLoweringObjectFile &getObjFileLowering() const;
+
+ /// getDataLayout - Return information about data layout.
+ const DataLayout &getDataLayout() 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);
- /// 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 &) {}
-
/// 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) {
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();
- /// EmitInstruction - Targets should implement this to emit instructions.
- virtual void EmitInstruction(const MachineInstr *) {
- assert(0 && "EmitInstruction not implemented");
- }
-
- /// EmitFunctionBodyStart - Targets can override this to emit stuff before
- /// the first basic block in the function.
- virtual void EmitFunctionBodyStart() {}
+ 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;
- /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
- /// the last basic block in the function.
- virtual void EmitFunctionBodyEnd() {}
-
/// 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.
+
+ /// 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);
- public:
+ /// 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
//===------------------------------------------------------------------===//
- // Emission routines.
- //
- /// EmitInt8 - Emit a byte directive and value.
- ///
- void EmitInt8(int Value) const;
+ // Targets can, or in the case of EmitInstruction, must implement these to
+ // customize output.
- /// EmitInt16 - Emit a short directive and value.
- ///
- void EmitInt16(int Value) const;
+ /// EmitStartOfAsmFile - This virtual method can be overridden by targets
+ /// that want to emit something at the start of their file.
+ virtual void EmitStartOfAsmFile(Module &) {}
- /// EmitInt32 - Emit a long directive and value.
- ///
- void EmitInt32(int Value) const;
+ /// EmitEndOfAsmFile - This virtual method can be overridden by targets that
+ /// want to emit something at the end of their file.
+ virtual void EmitEndOfAsmFile(Module &) {}
- /// 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;
+ /// 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;
- /// 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 unconditionally override the
- /// alignment request. However, if ForcedAlignBits is specified, this value
- /// has final say: the ultimate alignment will be the max of ForcedAlignBits
- /// and the alignment computed with NumBits and the global. If UseFillExpr
- /// is true, it also emits an optional second value FillValue which the
- /// assembler uses to fill gaps to match alignment for text sections if the
- /// has specified a non-zero fill value.
- ///
- /// The algorithm is:
- /// Align = NumBits;
- /// if (GV && GV->hasalignment) Align = GV->getalignment();
- /// Align = std::max(Align, ForcedAlignBits);
- ///
- void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
- unsigned ForcedAlignBits = 0,
- bool UseFillExpr = true) const;
/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
/// global value name as its base, with the specified suffix, and where the
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;
MCSymbol *GetBlockAddressSymbol(const BlockAddress *BA) const;
MCSymbol *GetBlockAddressSymbol(const BasicBlock *BB) 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;
-
-
- // Data emission.
-
- /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
- void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
-
- protected:
- virtual void EmitFunctionEntryLabel();
-
- virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
-
+ //===------------------------------------------------------------------===//
+ // Emission Helper Routines.
+ //===------------------------------------------------------------------===//
+ public:
/// printOffset - This is just convenient handler for printing offsets.
void printOffset(int64_t Offset, raw_ostream &OS) const;
- /// 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;
+ /// EmitInt8 - Emit a byte directive and value.
+ ///
+ void EmitInt8(int Value) const;
- private:
- /// EmitImplicitDef - This method emits the specified machine instruction
- /// that is an implicit def.
- void EmitImplicitDef(const MachineInstr *MI) const;
+ /// EmitInt16 - Emit a short directive and value.
+ ///
+ void EmitInt16(int Value) const;
- /// EmitKill - This method emits the specified kill machine instruction.
- void EmitKill(const MachineInstr *MI) 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;
+
+ /// EmitLabelReference - Emit something like ".long Label"
+ /// where the size in bytes of the directive is specified by Size and Label
+ /// specifies the label.
+ void EmitLabelReference(const MCSymbol *Label, unsigned Size) const {
+ EmitLabelPlusOffset(Label, 0, Size);
+ }
+
+ //===------------------------------------------------------------------===//
+ // 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 reference to a ttype global with a specified encoding.
+ void EmitTTypeReference(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;
- /// EmitVisibility - This emits visibility information about symbol, if
- /// this is suported by the target.
- void EmitVisibility(MCSymbol *Sym, unsigned Visibility) const;
-
- void EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const;
-
- void EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
- const MachineBasicBlock *MBB,
- unsigned uid) const;
- void EmitLLVMUsedList(Constant *List);
- void EmitXXStructorList(Constant *List);
- GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);
-
//===------------------------------------------------------------------===//
// 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
/// 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
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,
+ unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &OS);
-
+
private:
/// Private state for PrintSpecial()
// Assign a unique ID to this machine instruction.
mutable unsigned SetCounter;
/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
- void EmitInlineAsm(StringRef Str) const;
-
+ void EmitInlineAsm(StringRef Str, const MDNode *LocMDNode = 0,
+ InlineAsm::AsmDialect AsmDialect = InlineAsm::AD_ATT) 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);
};
}
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