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https://github.com/c64scene-ar/llvm-6502.git
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d80781b98b
The ELF implementation now creates text, data and bss to match the gnu as behavior. The text streamer still has the old MachO specific behavior since the testsuite checks that it will error when a directive is given before a setting the current section for example. A nice benefit is that -n is not required anymore when producing ELF files. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114027 91177308-0d34-0410-b5e6-96231b3b80d8
388 lines
16 KiB
C++
388 lines
16 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/System/DataTypes.h"
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#include "llvm/MC/MCDirectives.h"
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namespace llvm {
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class MCAsmInfo;
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class MCCodeEmitter;
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class MCContext;
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class MCExpr;
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class MCInst;
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class MCInstPrinter;
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class MCSection;
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class MCSymbol;
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class StringRef;
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class TargetAsmBackend;
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class Twine;
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class raw_ostream;
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class formatted_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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/// handle 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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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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/// CurSection - This is the current section code is being emitted to, it is
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/// kept up to date by SwitchSection.
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const MCSection *CurSection;
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/// PrevSection - This is the previous section code is being emitted to, it
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/// is kept up to date by SwitchSection.
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const MCSection *PrevSection;
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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 Assembly File Formatting.
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/// @{
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/// isVerboseAsm - Return true if this streamer supports verbose assembly
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/// and if it is enabled.
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virtual bool isVerboseAsm() const { return false; }
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/// hasRawTextSupport - Return true if this asm streamer supports emitting
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/// unformatted text to the .s file with EmitRawText.
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virtual bool hasRawTextSupport() const { return false; }
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/// AddComment - Add a comment that can be emitted to the generated .s
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/// file if applicable as a QoI issue to make the output of the compiler
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/// more readable. This only affects the MCAsmStreamer, and only when
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/// verbose assembly output is enabled.
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///
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/// If the comment includes embedded \n's, they will each get the comment
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/// prefix as appropriate. The added comment should not end with a \n.
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virtual void AddComment(const Twine &T) {}
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/// GetCommentOS - Return a raw_ostream that comments can be written to.
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/// Unlike AddComment, you are required to terminate comments with \n if you
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/// use this method.
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virtual raw_ostream &GetCommentOS();
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/// AddBlankLine - Emit a blank line to a .s file to pretty it up.
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virtual void AddBlankLine() {}
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/// @}
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/// @name Symbol & Section Management
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/// @{
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/// getCurrentSection - Return the current section that the streamer is
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/// emitting code to.
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const MCSection *getCurrentSection() const { return CurSection; }
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/// getPreviousSection - Return the previous section that the streamer is
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/// emitting code to.
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const MCSection *getPreviousSection() const { return PrevSection; }
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/// SwitchSection - Set the current section where code is being emitted to
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/// @p Section. This is required to update CurSection.
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///
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/// This corresponds to assembler directives like .section, .text, etc.
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virtual void SwitchSection(const MCSection *Section) = 0;
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/// InitSections - Create the default sections and set the initial one.
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virtual void InitSections() = 0;
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/// EmitLabel - Emit a label for @p 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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virtual void EmitLabel(MCSymbol *Symbol) = 0;
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/// EmitAssemblerFlag - Note in the output the specified @p Flag
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virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) = 0;
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/// EmitAssignment - Emit an assignment of @p Value to @p 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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virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0;
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/// EmitSymbolAttribute - Add the given @p Attribute to @p Symbol.
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virtual void EmitSymbolAttribute(MCSymbol *Symbol,
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MCSymbolAttr Attribute) = 0;
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/// EmitSymbolDesc - Set the @p DescValue for the @p 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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/// BeginCOFFSymbolDef - Start emitting COFF symbol definition
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///
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/// @param Symbol - The symbol to have its External & Type fields set.
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virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) = 0;
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/// EmitCOFFSymbolStorageClass - Emit the storage class of the symbol.
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///
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/// @param StorageClass - The storage class the symbol should have.
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virtual void EmitCOFFSymbolStorageClass(int StorageClass) = 0;
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/// EmitCOFFSymbolType - Emit the type of the symbol.
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///
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/// @param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h)
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virtual void EmitCOFFSymbolType(int Type) = 0;
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/// EndCOFFSymbolDef - Marks the end of the symbol definition.
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virtual void EndCOFFSymbolDef() = 0;
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/// EmitELFSize - Emit an ELF .size directive.
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///
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/// This corresponds to an assembler statement such as:
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/// .size symbol, expression
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///
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virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) = 0;
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/// EmitCommonSymbol - Emit a common symbol.
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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 ByteAlignment - The alignment of the symbol if
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/// non-zero. This must be a power of 2.
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virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) = 0;
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/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
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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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virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) = 0;
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/// EmitZerofill - Emit the zerofill section and an optional symbol.
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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 ByteAlignment - The alignment of the zerofill symbol if
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/// non-zero. This must be a power of 2 on some targets.
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virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
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unsigned Size = 0,unsigned ByteAlignment = 0) = 0;
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/// EmitTBSSSymbol - Emit a thread local bss (.tbss) symbol.
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///
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/// @param Section - The thread local common section.
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/// @param Symbol - The thread local common symbol to emit.
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/// @param Size - The size of the symbol.
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/// @param ByteAlignment - The alignment of the thread local common symbol
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/// if non-zero. This must be a power of 2 on some targets.
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virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment = 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 \arg 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(StringRef Data, unsigned AddrSpace) = 0;
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/// EmitValue - Emit the expression @p Value into the output as a native
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/// integer of the given @p 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 MCExpr *Value, unsigned Size,
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unsigned AddrSpace = 0) = 0;
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/// EmitIntValue - Special case of EmitValue that avoids the client having
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/// to pass in a MCExpr for constant integers.
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virtual void EmitIntValue(uint64_t Value, unsigned Size,
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unsigned AddrSpace = 0);
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/// EmitSymbolValue - Special case of EmitValue that avoids the client
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/// having to pass in a MCExpr for MCSymbols.
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virtual void EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
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unsigned AddrSpace);
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/// EmitGPRel32Value - Emit the expression @p Value into the output as a
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/// gprel32 (32-bit GP relative) value.
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///
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/// This is used to implement assembler directives such as .gprel32 on
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/// targets that support them.
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virtual void EmitGPRel32Value(const MCExpr *Value) = 0;
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/// EmitFill - Emit NumBytes bytes worth of the value specified by
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/// FillValue. This implements directives such as '.space'.
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virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
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unsigned AddrSpace);
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/// EmitZeros - Emit NumBytes worth of zeros. This is a convenience
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/// function that just wraps EmitFill.
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void EmitZeros(uint64_t NumBytes, unsigned AddrSpace) {
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EmitFill(NumBytes, 0, AddrSpace);
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}
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/// EmitValueToAlignment - Emit some number of copies of @p Value until
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/// the byte alignment @p 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 @p 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 ValueSize - The size of the integer (in bytes) to emit for
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/// @p 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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/// EmitCodeAlignment - Emit nops until the byte alignment @p ByteAlignment
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/// is reached.
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///
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/// This used to align code where the alignment bytes may be executed. This
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/// can emit different bytes for different sizes to optimize execution.
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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 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 EmitCodeAlignment(unsigned ByteAlignment,
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unsigned MaxBytesToEmit = 0) = 0;
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/// EmitValueToOffset - Emit some number of copies of @p Value until the
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/// byte offset @p 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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virtual void EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value = 0) = 0;
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/// @}
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/// EmitFileDirective - Switch to a new logical file. This is used to
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/// implement the '.file "foo.c"' assembler directive.
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virtual void EmitFileDirective(StringRef Filename) = 0;
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/// EmitDwarfFileDirective - Associate a filename with a specified logical
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/// file number. This implements the DWARF2 '.file 4 "foo.c"' assembler
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/// directive.
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virtual void EmitDwarfFileDirective(unsigned FileNo,StringRef Filename) = 0;
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/// EmitInstruction - Emit the given @p Instruction into the current
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/// section.
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virtual void EmitInstruction(const MCInst &Inst) = 0;
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/// EmitRawText - If this file is backed by a assembly streamer, this dumps
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/// the specified string in the output .s file. This capability is
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/// indicated by the hasRawTextSupport() predicate. By default this aborts.
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virtual void EmitRawText(StringRef String);
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void EmitRawText(const Twine &String);
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/// Finish - Finish emission of machine code.
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virtual void Finish() = 0;
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};
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/// createNullStreamer - Create a dummy machine code streamer, which does
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/// nothing. This is useful for timing the assembler front end.
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MCStreamer *createNullStreamer(MCContext &Ctx);
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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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///
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/// \param InstPrint - If given, the instruction printer to use. If not given
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/// the MCInst representation will be printed. This method takes ownership of
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/// InstPrint.
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///
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/// \param CE - If given, a code emitter to use to show the instruction
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/// encoding inline with the assembly. This method takes ownership of \arg CE.
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///
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/// \param ShowInst - Whether to show the MCInst representation inline with
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/// the assembly.
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MCStreamer *createAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS,
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bool isLittleEndian, bool isVerboseAsm,
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MCInstPrinter *InstPrint = 0,
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MCCodeEmitter *CE = 0,
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bool ShowInst = false);
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/// createMachOStreamer - Create a machine code streamer which will generate
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/// Mach-O format object files.
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///
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/// Takes ownership of \arg TAB and \arg CE.
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MCStreamer *createMachOStreamer(MCContext &Ctx, TargetAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *CE,
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bool RelaxAll = false);
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/// createWinCOFFStreamer - Create a machine code streamer which will
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/// generate Microsoft COFF format object files.
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///
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/// Takes ownership of \arg TAB and \arg CE.
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MCStreamer *createWinCOFFStreamer(MCContext &Ctx,
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TargetAsmBackend &TAB,
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MCCodeEmitter &CE, raw_ostream &OS,
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bool RelaxAll = false);
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/// createELFStreamer - Create a machine code streamer which will generate
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/// ELF format object files.
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MCStreamer *createELFStreamer(MCContext &Ctx, TargetAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *CE,
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bool RelaxAll = false);
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/// createLoggingStreamer - Create a machine code streamer which just logs the
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/// API calls and then dispatches to another streamer.
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///
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/// The new streamer takes ownership of the \arg Child.
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MCStreamer *createLoggingStreamer(MCStreamer *Child, raw_ostream &OS);
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} // end namespace llvm
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#endif
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