mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 00:32:23 +00:00
9a7e2ccf57
- My DFS traversal of LLVM is, at least for now, nearly complete! :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77258 91177308-0d34-0410-b5e6-96231b3b80d8
251 lines
9.9 KiB
C++
251 lines
9.9 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/Support/DataTypes.h"
|
|
|
|
namespace llvm {
|
|
class MCContext;
|
|
class MCValue;
|
|
class MCInst;
|
|
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
|
|
/// 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);
|
|
|
|
public:
|
|
virtual ~MCStreamer();
|
|
|
|
MCContext &getContext() const { return Context; }
|
|
|
|
/// @name Symbol & Section Management
|
|
/// @{
|
|
|
|
/// SwitchSection - Set the current section where code is being emitted to
|
|
/// @param Section.
|
|
///
|
|
/// This corresponds to assembler directives like .section, .text, etc.
|
|
virtual void SwitchSection(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.
|
|
//
|
|
// 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:
|
|
/// 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.
|
|
/// @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;
|
|
|
|
/// 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;
|
|
|
|
/// EmitLocalSymbol - Emit a local symbol of @param Value to @param Symbol.
|
|
///
|
|
/// @param Symbol - The local symbol being created.
|
|
/// @param Value - The value for the symbol.
|
|
virtual void EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) = 0;
|
|
|
|
/// EmitCommonSymbol - Emit a common or local common symbol of @param Size
|
|
/// with the @param Pow2Alignment if non-zero.
|
|
///
|
|
/// @param Symbol - The common symbol to emit.
|
|
/// @param Size - The size of the common symbol.
|
|
/// @param Pow2Alignment - The alignment of the common symbol if non-zero.
|
|
/// @param IsLocal - If true, then the symbol is to be a local common
|
|
virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
|
|
unsigned Pow2Alignment, bool IsLocal) = 0;
|
|
|
|
/// EmitZerofill - Emit a the zerofill section and possiblity a symbol, if
|
|
/// @param Symbol is non-NULL, for @param Size and with the @param
|
|
/// Pow2Alignment if non-zero.
|
|
///
|
|
/// @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 Pow2Alignment - The alignment of the zerofill symbol if non-zero.
|
|
virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = 0,
|
|
unsigned Size = 0,unsigned Pow2Alignment = 0) = 0;
|
|
|
|
/// AbortAssembly - Stop and don't produce output, printing @param
|
|
/// AbortReason if non-NULL to indicate the reason the assembly is
|
|
/// terminated.
|
|
///
|
|
/// @param AbortReason - The reason assembly is terminated, if non-NULL.
|
|
virtual void AbortAssembly(const char *AbortReason) = 0;
|
|
|
|
/// @}
|
|
/// @name Generating Data
|
|
/// @{
|
|
|
|
/// EmitBytes - Emit the bytes in @param Data into the output.
|
|
///
|
|
/// This is used to implement assembler directives such as .byte, .ascii,
|
|
/// etc.
|
|
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.
|
|
///
|
|
/// 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 MCValue &Value, unsigned Size) = 0;
|
|
|
|
/// 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.
|
|
//
|
|
// FIXME: How are we going to signal failures out of this?
|
|
virtual void EmitValueToOffset(const MCValue &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;
|
|
};
|
|
|
|
/// 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);
|
|
|
|
// 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);
|
|
|
|
/// createELFStreamer - Create a machine code streamer which will generative
|
|
/// ELF format object files.
|
|
MCStreamer *createELFStreamer(MCContext &Ctx, raw_ostream &OS);
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|