diff options
Diffstat (limited to 'include/llvm/MC/MCStreamer.h')
| -rw-r--r-- | include/llvm/MC/MCStreamer.h | 93 |
1 files changed, 65 insertions, 28 deletions
diff --git a/include/llvm/MC/MCStreamer.h b/include/llvm/MC/MCStreamer.h index 54de8a3..248e6b0 100644 --- a/include/llvm/MC/MCStreamer.h +++ b/include/llvm/MC/MCStreamer.h @@ -17,17 +17,21 @@ #include "llvm/Support/DataTypes.h" namespace llvm { + class MCAsmInfo; + class MCCodeEmitter; class MCContext; - class MCValue; + class MCExpr; class MCInst; + class MCInstPrinter; class MCSection; class MCSymbol; + class StringRef; class raw_ostream; /// MCStreamer - Streaming machine code generation interface. This interface /// is intended to provide a programatic interface that is very similar to the /// level that an assembler .s file provides. It has callbacks to emit bytes, - /// "emit directives", etc. The implementation of this interface retains + /// handle directives, etc. The implementation of this interface retains /// state to know what the current section is etc. /// /// There are multiple implementations of this interface: one for writing out @@ -53,6 +57,10 @@ namespace llvm { SymbolAttrLast = WeakReference }; + enum AssemblerFlag { + SubsectionsViaSymbols /// .subsections_via_symbols (Apple) + }; + private: MCContext &Context; @@ -62,6 +70,10 @@ namespace llvm { protected: MCStreamer(MCContext &Ctx); + /// CurSection - This is the current section code is being emitted to, it is + /// kept up to date by SwitchSection. + const MCSection *CurSection; + public: virtual ~MCStreamer(); @@ -69,13 +81,17 @@ namespace llvm { /// @name Symbol & Section Management /// @{ + + /// getCurrentSection - Return the current seciton that the streamer is + /// emitting code to. + const MCSection *getCurrentSection() const { return CurSection; } /// SwitchSection - Set the current section where code is being emitted to - /// @param Section. + /// @param Section. This is required to update CurSection. /// /// This corresponds to assembler directives like .section, .text, etc. - virtual void SwitchSection(MCSection *Section) = 0; - + virtual void SwitchSection(const MCSection *Section) = 0; + /// EmitLabel - Emit a label for @param Symbol into the current section. /// /// This corresponds to an assembler statement such as: @@ -84,11 +100,11 @@ namespace llvm { /// @param Symbol - The symbol to emit. A given symbol should only be /// emitted as a label once, and symbols emitted as a label should never be /// used in an assignment. - // - // FIXME: What to do about the current section? Should we get rid of the - // symbol section in the constructor and initialize it here? virtual void EmitLabel(MCSymbol *Symbol) = 0; + /// EmitAssemblerFlag - Note in the output the specified @param Flag + virtual void EmitAssemblerFlag(AssemblerFlag Flag) = 0; + /// EmitAssignment - Emit an assignment of @param Value to @param Symbol. /// /// This corresponds to an assembler statement such as: @@ -100,31 +116,46 @@ namespace llvm { /// /// @param Symbol - The symbol being assigned to. /// @param Value - The value for the symbol. - /// @param MakeAbsolute - If true, then the symbol should be given the - /// absolute value of @param Value, even if @param Value would be - /// relocatable expression. This corresponds to the ".set" directive. - virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value, - bool MakeAbsolute = false) = 0; + virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0; /// EmitSymbolAttribute - Add the given @param Attribute to @param Symbol. - // - // FIXME: This doesn't make much sense, could we just have attributes be on - // the symbol and make the printer smart enough to add the right symbols? - // This should work as long as the order of attributes in the file doesn't - // matter. virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute) = 0; + /// EmitSymbolDesc - Set the @param DescValue for the @param Symbol. + /// + /// @param Symbol - The symbol to have its n_desc field set. + /// @param DescValue - The value to set into the n_desc field. + virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) = 0; + + /// EmitCommonSymbol - Emit a common or local common symbol. + /// + /// @param Symbol - The common symbol to emit. + /// @param Size - The size of the common symbol. + /// @param ByteAlignment - The alignment of the symbol if + /// non-zero. This must be a power of 2 on some targets. + virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size, + unsigned ByteAlignment) = 0; + + /// EmitZerofill - Emit a the zerofill section and an option symbol. + /// + /// @param Section - The zerofill section to create and or to put the symbol + /// @param Symbol - The zerofill symbol to emit, if non-NULL. + /// @param Size - The size of the zerofill symbol. + /// @param ByteAlignment - The alignment of the zerofill symbol if + /// non-zero. This must be a power of 2 on some targets. + virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0, + unsigned Size = 0,unsigned ByteAlignment = 0) = 0; + /// @} /// @name Generating Data /// @{ - /// EmitBytes - Emit @param Length bytes starting at @param Data into the - /// output. + /// EmitBytes - Emit the bytes in \arg Data into the output. /// /// This is used to implement assembler directives such as .byte, .ascii, /// etc. - virtual void EmitBytes(const char *Data, unsigned Length) = 0; + virtual void EmitBytes(const StringRef &Data) = 0; /// EmitValue - Emit the expression @param Value into the output as a native /// integer of the given @param Size bytes. @@ -135,7 +166,7 @@ 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 MCValue &Value, unsigned Size) = 0; + virtual void EmitValue(const MCExpr *Value, unsigned Size) = 0; /// EmitValueToAlignment - Emit some number of copies of @param Value until /// the byte alignment @param ByteAlignment is reached. @@ -163,12 +194,10 @@ namespace llvm { /// /// This is used to implement assembler directives such as .org. /// - /// @param Offset - The offset to reach.This may be an expression, but the + /// @param Offset - The offset to reach. This may be an expression, but the /// expression must be associated with the current section. /// @param Value - The value to use when filling bytes. - // - // FIXME: How are we going to signal failures out of this? - virtual void EmitValueToOffset(const MCValue &Offset, + virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value = 0) = 0; /// @} @@ -181,10 +210,17 @@ namespace llvm { virtual void Finish() = 0; }; + /// createNullStreamer - Create a dummy machine code streamer, which does + /// nothing. This is useful for timing the assembler front end. + MCStreamer *createNullStreamer(MCContext &Ctx); + /// createAsmStreamer - Create a machine code streamer which will print out /// assembly for the native target, suitable for compiling with a native /// assembler. - MCStreamer *createAsmStreamer(MCContext &Ctx, raw_ostream &OS); + MCStreamer *createAsmStreamer(MCContext &Ctx, raw_ostream &OS, + const MCAsmInfo &MAI, + MCInstPrinter *InstPrint = 0, + MCCodeEmitter *CE = 0); // FIXME: These two may end up getting rolled into a single // createObjectStreamer interface, which implements the assembler backend, and @@ -192,7 +228,8 @@ namespace llvm { /// createMachOStream - Create a machine code streamer which will generative /// Mach-O format object files. - MCStreamer *createMachOStreamer(MCContext &Ctx, raw_ostream &OS); + MCStreamer *createMachOStreamer(MCContext &Ctx, raw_ostream &OS, + MCCodeEmitter *CE = 0); /// createELFStreamer - Create a machine code streamer which will generative /// ELF format object files. |
