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244 lines
9.6 KiB
C++
244 lines
9.6 KiB
C++
//===- MCStreamer.h - High-level Streaming Machine Code Output --*- 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 declares the MCStreamer class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSTREAMER_H
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#define LLVM_MC_MCSTREAMER_H
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class MCContext;
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class MCValue;
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class MCInst;
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class MCSection;
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class MCSymbol;
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class StringRef;
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class raw_ostream;
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/// MCStreamer - Streaming machine code generation interface. This interface
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/// is intended to provide a programatic interface that is very similar to the
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/// level that an assembler .s file provides. It has callbacks to emit bytes,
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/// "emit directives", etc. The implementation of this interface retains
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/// state to know what the current section is etc.
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///
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/// There are multiple implementations of this interface: one for writing out
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/// a .s file, and implementations that write out .o files of various formats.
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///
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class MCStreamer {
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public:
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enum SymbolAttr {
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Global, /// .globl
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Hidden, /// .hidden (ELF)
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IndirectSymbol, /// .indirect_symbol (Apple)
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Internal, /// .internal (ELF)
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LazyReference, /// .lazy_reference (Apple)
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NoDeadStrip, /// .no_dead_strip (Apple)
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PrivateExtern, /// .private_extern (Apple)
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Protected, /// .protected (ELF)
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Reference, /// .reference (Apple)
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Weak, /// .weak
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WeakDefinition, /// .weak_definition (Apple)
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WeakReference, /// .weak_reference (Apple)
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SymbolAttrFirst = Global,
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SymbolAttrLast = WeakReference
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};
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enum AssemblerFlag {
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SubsectionsViaSymbols /// .subsections_via_symbols (Apple)
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};
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private:
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MCContext &Context;
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MCStreamer(const MCStreamer&); // DO NOT IMPLEMENT
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MCStreamer &operator=(const MCStreamer&); // DO NOT IMPLEMENT
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protected:
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MCStreamer(MCContext &Ctx);
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public:
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virtual ~MCStreamer();
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MCContext &getContext() const { return Context; }
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/// @name Symbol & Section Management
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/// @{
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/// SwitchSection - Set the current section where code is being emitted to
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/// @param Section.
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///
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/// This corresponds to assembler directives like .section, .text, etc.
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virtual void SwitchSection(MCSection *Section) = 0;
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/// EmitLabel - Emit a label for @param Symbol into the current section.
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///
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/// This corresponds to an assembler statement such as:
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/// foo:
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///
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/// @param Symbol - The symbol to emit. A given symbol should only be
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/// emitted as a label once, and symbols emitted as a label should never be
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/// used in an assignment.
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//
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// FIXME: What to do about the current section? Should we get rid of the
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// symbol section in the constructor and initialize it here?
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virtual void EmitLabel(MCSymbol *Symbol) = 0;
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/// EmitAssemblerFlag - Note in the output the specified @param Flag
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virtual void EmitAssemblerFlag(AssemblerFlag Flag) = 0;
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/// EmitAssignment - Emit an assignment of @param Value to @param Symbol.
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///
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/// This corresponds to an assembler statement such as:
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/// symbol = value
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///
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/// The assignment generates no code, but has the side effect of binding the
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/// value in the current context. For the assembly streamer, this prints the
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/// binding into the .s file.
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///
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/// @param Symbol - The symbol being assigned to.
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/// @param Value - The value for the symbol.
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/// @param MakeAbsolute - If true, then the symbol should be given the
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/// absolute value of @param Value, even if @param Value would be
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/// relocatable expression. This corresponds to the ".set" directive.
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virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
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bool MakeAbsolute = false) = 0;
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/// EmitSymbolAttribute - Add the given @param Attribute to @param Symbol.
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//
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// FIXME: This doesn't make much sense, could we just have attributes be on
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// the symbol and make the printer smart enough to add the right symbols?
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// This should work as long as the order of attributes in the file doesn't
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// matter.
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virtual void EmitSymbolAttribute(MCSymbol *Symbol,
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SymbolAttr Attribute) = 0;
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/// EmitSymbolDesc - Set the @param DescValue for the @param Symbol.
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///
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/// @param Symbol - The symbol to have its n_desc field set.
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/// @param DescValue - The value to set into the n_desc field.
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) = 0;
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/// EmitLocalSymbol - Emit a local symbol of @param Value to @param Symbol.
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///
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/// @param Symbol - The local symbol being created.
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/// @param Value - The value for the symbol.
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virtual void EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) = 0;
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/// EmitCommonSymbol - Emit a common or local common symbol of @param Size
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/// with the @param Pow2Alignment if non-zero.
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///
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/// @param Symbol - The common symbol to emit.
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/// @param Size - The size of the common symbol.
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/// @param Pow2Alignment - The alignment of the common symbol if non-zero.
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/// @param IsLocal - If true, then the symbol is to be a local common
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virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
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unsigned Pow2Alignment, bool IsLocal) = 0;
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/// EmitZerofill - Emit a the zerofill section and possiblity a symbol, if
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/// @param Symbol is non-NULL, for @param Size and with the @param
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/// Pow2Alignment if non-zero.
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///
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/// @param Section - The zerofill section to create and or to put the symbol
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/// @param Symbol - The zerofill symbol to emit, if non-NULL.
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/// @param Size - The size of the zerofill symbol.
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/// @param Pow2Alignment - The alignment of the zerofill symbol if non-zero.
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virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = 0,
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unsigned Size = 0,unsigned Pow2Alignment = 0) = 0;
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/// @}
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/// @name Generating Data
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/// @{
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/// EmitBytes - Emit the bytes in @param Data into the output.
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///
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/// This is used to implement assembler directives such as .byte, .ascii,
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/// etc.
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virtual void EmitBytes(const StringRef &Data) = 0;
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/// EmitValue - Emit the expression @param Value into the output as a native
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/// integer of the given @param Size bytes.
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///
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/// This is used to implement assembler directives such as .word, .quad,
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/// etc.
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///
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/// @param Value - The value to emit.
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/// @param Size - The size of the integer (in bytes) to emit. This must
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/// match a native machine width.
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virtual void EmitValue(const MCValue &Value, unsigned Size) = 0;
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/// EmitValueToAlignment - Emit some number of copies of @param Value until
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/// the byte alignment @param ByteAlignment is reached.
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///
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/// If the number of bytes need to emit for the alignment is not a multiple
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/// of @param ValueSize, then the contents of the emitted fill bytes is
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/// undefined.
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///
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/// This used to implement the .align assembler directive.
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///
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/// @param ByteAlignment - The alignment to reach. This must be a power of
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/// two on some targets.
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/// @param Value - The value to use when filling bytes.
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/// @param Size - The size of the integer (in bytes) to emit for @param
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/// Value. This must match a native machine width.
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/// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
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/// the alignment cannot be reached in this many bytes, no bytes are
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/// emitted.
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virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
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unsigned ValueSize = 1,
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unsigned MaxBytesToEmit = 0) = 0;
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/// EmitValueToOffset - Emit some number of copies of @param Value until the
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/// byte offset @param Offset is reached.
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///
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/// This is used to implement assembler directives such as .org.
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///
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/// @param Offset - The offset to reach.This may be an expression, but the
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/// expression must be associated with the current section.
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/// @param Value - The value to use when filling bytes.
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//
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// FIXME: How are we going to signal failures out of this?
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virtual void EmitValueToOffset(const MCValue &Offset,
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unsigned char Value = 0) = 0;
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/// @}
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/// EmitInstruction - Emit the given @param Instruction into the current
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/// section.
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virtual void EmitInstruction(const MCInst &Inst) = 0;
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/// Finish - Finish emission of machine code and flush any output.
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virtual void Finish() = 0;
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};
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/// createAsmStreamer - Create a machine code streamer which will print out
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/// assembly for the native target, suitable for compiling with a native
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/// assembler.
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MCStreamer *createAsmStreamer(MCContext &Ctx, raw_ostream &OS);
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// FIXME: These two may end up getting rolled into a single
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// createObjectStreamer interface, which implements the assembler backend, and
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// is parameterized on an output object file writer.
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/// createMachOStream - Create a machine code streamer which will generative
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/// Mach-O format object files.
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MCStreamer *createMachOStreamer(MCContext &Ctx, raw_ostream &OS);
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/// createELFStreamer - Create a machine code streamer which will generative
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/// ELF format object files.
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MCStreamer *createELFStreamer(MCContext &Ctx, raw_ostream &OS);
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} // end namespace llvm
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#endif
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