mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-24 08:29:39 +00:00
0fd90fd8d1
AddComment and GetCommentOS. Add a blank line between globals (even in non-verbose mode) to make the assembly more readable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94202 91177308-0d34-0410-b5e6-96231b3b80d8
283 lines
11 KiB
C++
283 lines
11 KiB
C++
//===- MCStreamer.h - High-level Streaming Machine Code Output --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares the MCStreamer class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_MC_MCSTREAMER_H
|
|
#define LLVM_MC_MCSTREAMER_H
|
|
|
|
#include "llvm/System/DataTypes.h"
|
|
|
|
namespace llvm {
|
|
class MCAsmInfo;
|
|
class MCCodeEmitter;
|
|
class MCContext;
|
|
class MCExpr;
|
|
class MCInst;
|
|
class MCInstPrinter;
|
|
class MCSection;
|
|
class MCSymbol;
|
|
class StringRef;
|
|
class Twine;
|
|
class raw_ostream;
|
|
class formatted_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,
|
|
/// 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
|
|
/// a .s file, and implementations that write out .o files of various formats.
|
|
///
|
|
class MCStreamer {
|
|
public:
|
|
enum SymbolAttr {
|
|
Global, /// .globl
|
|
Hidden, /// .hidden (ELF)
|
|
IndirectSymbol, /// .indirect_symbol (Apple)
|
|
Internal, /// .internal (ELF)
|
|
LazyReference, /// .lazy_reference (Apple)
|
|
NoDeadStrip, /// .no_dead_strip (Apple)
|
|
PrivateExtern, /// .private_extern (Apple)
|
|
Protected, /// .protected (ELF)
|
|
Reference, /// .reference (Apple)
|
|
Weak, /// .weak
|
|
WeakDefinition, /// .weak_definition (Apple)
|
|
WeakReference, /// .weak_reference (Apple)
|
|
|
|
SymbolAttrFirst = Global,
|
|
SymbolAttrLast = WeakReference
|
|
};
|
|
|
|
enum AssemblerFlag {
|
|
SubsectionsViaSymbols /// .subsections_via_symbols (Apple)
|
|
};
|
|
|
|
private:
|
|
MCContext &Context;
|
|
|
|
MCStreamer(const MCStreamer&); // DO NOT IMPLEMENT
|
|
MCStreamer &operator=(const MCStreamer&); // DO NOT IMPLEMENT
|
|
|
|
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();
|
|
|
|
MCContext &getContext() const { return Context; }
|
|
|
|
/// @name Assembly File Formatting.
|
|
/// @{
|
|
|
|
/// AddComment - Add a comment that can be emitted to the generated .s
|
|
/// file if applicable as a QoI issue to make the output of the compiler
|
|
/// more readable. This only affects the MCAsmStreamer, and only when
|
|
/// verbose assembly output is enabled.
|
|
///
|
|
/// 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 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. This is required to update CurSection.
|
|
///
|
|
/// This corresponds to assembler directives like .section, .text, etc.
|
|
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:
|
|
/// foo:
|
|
///
|
|
/// @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.
|
|
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:
|
|
/// symbol = value
|
|
///
|
|
/// The assignment generates no code, but has the side effect of binding the
|
|
/// value in the current context. For the assembly streamer, this prints the
|
|
/// binding into the .s file.
|
|
///
|
|
/// @param Symbol - The symbol being assigned to.
|
|
/// @param Value - The value for the symbol.
|
|
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0;
|
|
|
|
/// EmitSymbolAttribute - Add the given @param Attribute to @param Symbol.
|
|
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 the bytes in \arg Data into the output.
|
|
///
|
|
/// This is used to implement assembler directives such as .byte, .ascii,
|
|
/// etc.
|
|
virtual void EmitBytes(StringRef Data, unsigned AddrSpace) = 0;
|
|
|
|
/// EmitValue - Emit the expression @param Value into the output as a native
|
|
/// integer of the given @param Size bytes.
|
|
///
|
|
/// This is used to implement assembler directives such as .word, .quad,
|
|
/// etc.
|
|
///
|
|
/// @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;
|
|
|
|
/// 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);
|
|
|
|
/// 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 @param Value until
|
|
/// the byte alignment @param ByteAlignment is reached.
|
|
///
|
|
/// If the number of bytes need to emit for the alignment is not a multiple
|
|
/// of @param ValueSize, then the contents of the emitted fill bytes is
|
|
/// undefined.
|
|
///
|
|
/// This used to implement the .align assembler directive.
|
|
///
|
|
/// @param ByteAlignment - The alignment to reach. This must be a power of
|
|
/// two on some targets.
|
|
/// @param Value - The value to use when filling bytes.
|
|
/// @param Size - The size of the integer (in bytes) to emit for @param
|
|
/// Value. This must match a native machine width.
|
|
/// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
|
|
/// the alignment cannot be reached in this many bytes, no bytes are
|
|
/// emitted.
|
|
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
|
|
unsigned ValueSize = 1,
|
|
unsigned MaxBytesToEmit = 0) = 0;
|
|
|
|
/// EmitValueToOffset - Emit some number of copies of @param Value until the
|
|
/// byte offset @param Offset is reached.
|
|
///
|
|
/// This is used to implement assembler directives such as .org.
|
|
///
|
|
/// @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.
|
|
virtual void EmitValueToOffset(const MCExpr *Offset,
|
|
unsigned char Value = 0) = 0;
|
|
|
|
/// @}
|
|
|
|
/// EmitInstruction - Emit the given @param Instruction into the current
|
|
/// section.
|
|
virtual void EmitInstruction(const MCInst &Inst) = 0;
|
|
|
|
/// Finish - Finish emission of machine code and flush any output.
|
|
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, formatted_raw_ostream &OS,
|
|
const MCAsmInfo &MAI, bool isLittleEndian,
|
|
bool isVerboseAsm,
|
|
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
|
|
// is parameterized on an output object file writer.
|
|
|
|
/// createMachOStream - Create a machine code streamer which will generative
|
|
/// Mach-O format object files.
|
|
MCStreamer *createMachOStreamer(MCContext &Ctx, raw_ostream &OS,
|
|
MCCodeEmitter *CE = 0);
|
|
|
|
/// createELFStreamer - Create a machine code streamer which will generative
|
|
/// ELF format object files.
|
|
MCStreamer *createELFStreamer(MCContext &Ctx, raw_ostream &OS);
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|