diff options
Diffstat (limited to 'include/llvm/MC/MCStreamer.h')
| -rw-r--r-- | include/llvm/MC/MCStreamer.h | 232 |
1 files changed, 192 insertions, 40 deletions
diff --git a/include/llvm/MC/MCStreamer.h b/include/llvm/MC/MCStreamer.h index 1ce1b0e..fc2451f 100644 --- a/include/llvm/MC/MCStreamer.h +++ b/include/llvm/MC/MCStreamer.h @@ -14,8 +14,10 @@ #ifndef LLVM_MC_MCSTREAMER_H #define LLVM_MC_MCSTREAMER_H -#include "llvm/System/DataTypes.h" +#include "llvm/ADT/SmallVector.h" +#include "llvm/Support/DataTypes.h" #include "llvm/MC/MCDirectives.h" +#include "llvm/MC/MCDwarf.h" namespace llvm { class MCAsmInfo; @@ -28,6 +30,7 @@ namespace llvm { class MCSymbol; class StringRef; class TargetAsmBackend; + class TargetLoweringObjectFile; class Twine; class raw_ostream; class formatted_raw_ostream; @@ -47,29 +50,44 @@ namespace llvm { MCStreamer(const MCStreamer&); // DO NOT IMPLEMENT MCStreamer &operator=(const MCStreamer&); // DO NOT IMPLEMENT - protected: - MCStreamer(MCContext &Ctx); + void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, + bool isPCRel, unsigned AddrSpace); + + std::vector<MCDwarfFrameInfo> FrameInfos; + MCDwarfFrameInfo *getCurrentFrameInfo(); + void EnsureValidFrame(); + + /// CurSectionStack - This is stack of CurSection values saved by + /// PushSection. + SmallVector<const MCSection *, 4> CurSectionStack; - /// CurSection - This is the current section code is being emitted to, it is - /// kept up to date by SwitchSection. - const MCSection *CurSection; + /// PrevSectionStack - This is stack of PrevSection values saved by + /// PushSection. + SmallVector<const MCSection *, 4> PrevSectionStack; - /// PrevSection - This is the previous section code is being emitted to, it is - /// kept up to date by SwitchSection. - const MCSection *PrevSection; + protected: + MCStreamer(MCContext &Ctx); public: virtual ~MCStreamer(); MCContext &getContext() const { return Context; } + unsigned getNumFrameInfos() { + return FrameInfos.size(); + } + + const MCDwarfFrameInfo &getFrameInfo(unsigned i) { + return FrameInfos[i]; + } + /// @name Assembly File Formatting. /// @{ - + /// isVerboseAsm - Return true if this streamer supports verbose assembly /// and if it is enabled. virtual bool isVerboseAsm() const { return false; } - + /// hasRawTextSupport - Return true if this asm streamer supports emitting /// unformatted text to the .s file with EmitRawText. virtual bool hasRawTextSupport() const { return false; } @@ -82,34 +100,83 @@ namespace llvm { /// If the comment includes embedded \n's, they will each get the comment /// prefix as appropriate. The added comment should not end with a \n. virtual void AddComment(const Twine &T) {} - + /// GetCommentOS - Return a raw_ostream that comments can be written to. /// Unlike AddComment, you are required to terminate comments with \n if you /// use this method. virtual raw_ostream &GetCommentOS(); - + /// AddBlankLine - Emit a blank line to a .s file to pretty it up. virtual void AddBlankLine() {} - + /// @} - + /// @name Symbol & Section Management /// @{ - + /// getCurrentSection - Return the current section that the streamer is /// emitting code to. - const MCSection *getCurrentSection() const { return CurSection; } + const MCSection *getCurrentSection() const { + if (!CurSectionStack.empty()) + return CurSectionStack.back(); + return NULL; + } /// getPreviousSection - Return the previous section that the streamer is /// emitting code to. - const MCSection *getPreviousSection() const { return PrevSection; } + const MCSection *getPreviousSection() const { + if (!PrevSectionStack.empty()) + return PrevSectionStack.back(); + return NULL; + } + + /// ChangeSection - Update streamer for a new active section. + /// + /// This is called by PopSection and SwitchSection, if the current + /// section changes. + virtual void ChangeSection(const MCSection *) = 0; + + /// pushSection - Save the current and previous section on the + /// section stack. + void PushSection() { + PrevSectionStack.push_back(getPreviousSection()); + CurSectionStack.push_back(getCurrentSection()); + } + + /// popSection - Restore the current and previous section from + /// the section stack. Calls ChangeSection as needed. + /// + /// Returns false if the stack was empty. + bool PopSection() { + if (PrevSectionStack.size() <= 1) + return false; + assert(CurSectionStack.size() > 1); + PrevSectionStack.pop_back(); + const MCSection *oldSection = CurSectionStack.pop_back_val(); + const MCSection *curSection = CurSectionStack.back(); + + if (oldSection != curSection) + ChangeSection(curSection); + return true; + } /// SwitchSection - Set the current section where code is being emitted to /// @p Section. This is required to update CurSection. /// /// This corresponds to assembler directives like .section, .text, etc. - virtual void SwitchSection(const MCSection *Section) = 0; - + void SwitchSection(const MCSection *Section) { + assert(Section && "Cannot switch to a null section!"); + const MCSection *curSection = CurSectionStack.back(); + PrevSectionStack.back() = curSection; + if (Section != curSection) { + CurSectionStack.back() = Section; + ChangeSection(Section); + } + } + + /// InitSections - Create the default sections and set the initial one. + virtual void InitSections() = 0; + /// EmitLabel - Emit a label for @p Symbol into the current section. /// /// This corresponds to an assembler statement such as: @@ -123,6 +190,10 @@ namespace llvm { /// EmitAssemblerFlag - Note in the output the specified @p Flag virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) = 0; + /// EmitThumbFunc - Note in the output that the specified @p Func is + /// a Thumb mode function (ARM target only). + virtual void EmitThumbFunc(MCSymbol *Func) = 0; + /// EmitAssignment - Emit an assignment of @p Value to @p Symbol. /// /// This corresponds to an assembler statement such as: @@ -136,6 +207,15 @@ namespace llvm { /// @param Value - The value for the symbol. virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0; + /// EmitWeakReference - Emit an weak reference from @p Alias to @p Symbol. + /// + /// This corresponds to an assembler statement such as: + /// .weakref alias, symbol + /// + /// @param Alias - The alias that is being created. + /// @param Symbol - The symbol being aliased. + virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) = 0; + /// EmitSymbolAttribute - Add the given @p Attribute to @p Symbol. virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) = 0; @@ -170,7 +250,7 @@ namespace llvm { /// .size symbol, expression /// virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) = 0; - + /// EmitCommonSymbol - Emit a common symbol. /// /// @param Symbol - The common symbol to emit. @@ -185,7 +265,7 @@ namespace llvm { /// @param Symbol - The common symbol to emit. /// @param Size - The size of the common symbol. virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) = 0; - + /// EmitZerofill - Emit the zerofill section and an optional symbol. /// /// @param Section - The zerofill section to create and or to put the symbol @@ -204,7 +284,7 @@ namespace llvm { /// @param ByteAlignment - The alignment of the thread local common symbol /// if non-zero. This must be a power of 2 on some targets. virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size, unsigned ByteAlignment = 0) = 0; + uint64_t Size, unsigned ByteAlignment = 0) = 0; /// @} /// @name Generating Data /// @{ @@ -224,38 +304,67 @@ namespace llvm { /// @param Value - The value to emit. /// @param Size - The size of the integer (in bytes) to emit. This must /// match a native machine width. - virtual void EmitValue(const MCExpr *Value, unsigned Size, - unsigned AddrSpace = 0) = 0; + virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, + bool isPCRel, unsigned AddrSpace) = 0; + + void EmitValue(const MCExpr *Value, unsigned Size, unsigned AddrSpace = 0); + + void EmitPCRelValue(const MCExpr *Value, unsigned Size, + unsigned AddrSpace = 0); /// EmitIntValue - Special case of EmitValue that avoids the client having /// to pass in a MCExpr for constant integers. virtual void EmitIntValue(uint64_t Value, unsigned Size, unsigned AddrSpace = 0); - + + /// EmitAbsValue - Emit the Value, but try to avoid relocations. On MachO + /// this is done by producing + /// foo = value + /// .long foo + void EmitAbsValue(const MCExpr *Value, unsigned Size, + unsigned AddrSpace = 0); + + virtual void EmitULEB128Value(const MCExpr *Value, + unsigned AddrSpace = 0) = 0; + + virtual void EmitSLEB128Value(const MCExpr *Value, + unsigned AddrSpace = 0) = 0; + + /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the + /// client having to pass in a MCExpr for constant integers. + void EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace = 0); + + /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the + /// client having to pass in a MCExpr for constant integers. + void EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace = 0); + /// EmitSymbolValue - Special case of EmitValue that avoids the client /// having to pass in a MCExpr for MCSymbols. - virtual void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, - unsigned AddrSpace); - + void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, + unsigned AddrSpace = 0); + + void EmitPCRelSymbolValue(const MCSymbol *Sym, unsigned Size, + unsigned AddrSpace = 0); + /// EmitGPRel32Value - Emit the expression @p Value into the output as a /// gprel32 (32-bit GP relative) value. /// /// This is used to implement assembler directives such as .gprel32 on /// targets that support them. - virtual void EmitGPRel32Value(const MCExpr *Value) = 0; - + virtual void EmitGPRel32Value(const MCExpr *Value); + /// EmitFill - Emit NumBytes bytes worth of the value specified by /// FillValue. This implements directives such as '.space'. virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue, unsigned AddrSpace); - + /// EmitZeros - Emit NumBytes worth of zeros. This is a convenience /// function that just wraps EmitFill. void EmitZeros(uint64_t NumBytes, unsigned AddrSpace) { EmitFill(NumBytes, 0, AddrSpace); } - + /// EmitValueToAlignment - Emit some number of copies of @p Value until /// the byte alignment @p ByteAlignment is reached. /// @@ -301,17 +410,47 @@ namespace llvm { /// @param Value - The value to use when filling bytes. virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value = 0) = 0; - + /// @} - + /// EmitFileDirective - Switch to a new logical file. This is used to /// implement the '.file "foo.c"' assembler directive. virtual void EmitFileDirective(StringRef Filename) = 0; - + /// EmitDwarfFileDirective - Associate a filename with a specified logical /// file number. This implements the DWARF2 '.file 4 "foo.c"' assembler /// directive. - virtual void EmitDwarfFileDirective(unsigned FileNo,StringRef Filename) = 0; + virtual bool EmitDwarfFileDirective(unsigned FileNo,StringRef Filename); + + /// EmitDwarfLocDirective - This implements the DWARF2 + // '.loc fileno lineno ...' assembler directive. + virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line, + unsigned Column, unsigned Flags, + unsigned Isa, + unsigned Discriminator); + + virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, + const MCSymbol *LastLabel, + const MCSymbol *Label) = 0; + + virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel, + const MCSymbol *Label) { + } + + void EmitDwarfSetLineAddr(int64_t LineDelta, const MCSymbol *Label, + int PointerSize); + + virtual bool EmitCFIStartProc(); + virtual bool EmitCFIEndProc(); + virtual bool EmitCFIDefCfa(int64_t Register, int64_t Offset); + virtual bool EmitCFIDefCfaOffset(int64_t Offset); + virtual bool EmitCFIDefCfaRegister(int64_t Register); + virtual bool EmitCFIOffset(int64_t Register, int64_t Offset); + virtual bool EmitCFIPersonality(const MCSymbol *Sym, + unsigned Encoding); + virtual bool EmitCFILsda(const MCSymbol *Sym, unsigned Encoding); + virtual bool EmitCFIRememberState(); + virtual bool EmitCFIRestoreState(); /// EmitInstruction - Emit the given @p Instruction into the current /// section. @@ -322,7 +461,7 @@ namespace llvm { /// indicated by the hasRawTextSupport() predicate. By default this aborts. virtual void EmitRawText(StringRef String); void EmitRawText(const Twine &String); - + /// Finish - Finish emission of machine code. virtual void Finish() = 0; }; @@ -342,12 +481,18 @@ namespace llvm { /// \param CE - If given, a code emitter to use to show the instruction /// encoding inline with the assembly. This method takes ownership of \arg CE. /// + /// \param TAB - If given, a target asm backend to use to show the fixup + /// information in conjunction with encoding information. This method takes + /// ownership of \arg TAB. + /// /// \param ShowInst - Whether to show the MCInst representation inline with /// the assembly. MCStreamer *createAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS, - bool isLittleEndian, bool isVerboseAsm, + bool isVerboseAsm, + bool useLoc, MCInstPrinter *InstPrint = 0, MCCodeEmitter *CE = 0, + TargetAsmBackend *TAB = 0, bool ShowInst = false); /// createMachOStreamer - Create a machine code streamer which will generate @@ -371,7 +516,7 @@ namespace llvm { /// ELF format object files. MCStreamer *createELFStreamer(MCContext &Ctx, TargetAsmBackend &TAB, raw_ostream &OS, MCCodeEmitter *CE, - bool RelaxAll = false); + bool RelaxAll, bool NoExecStack); /// createLoggingStreamer - Create a machine code streamer which just logs the /// API calls and then dispatches to another streamer. @@ -379,6 +524,13 @@ namespace llvm { /// The new streamer takes ownership of the \arg Child. MCStreamer *createLoggingStreamer(MCStreamer *Child, raw_ostream &OS); + /// createPureStreamer - Create a machine code streamer which will generate + /// "pure" MC object files, for use with MC-JIT and testing tools. + /// + /// Takes ownership of \arg TAB and \arg CE. + MCStreamer *createPureStreamer(MCContext &Ctx, TargetAsmBackend &TAB, + raw_ostream &OS, MCCodeEmitter *CE); + } // end namespace llvm #endif |
