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//===-- llvm/Target/TargetAsmBackend.h - Target Asm Backend -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETASMBACKEND_H
#define LLVM_TARGET_TARGETASMBACKEND_H
namespace llvm {
class MCSection;
class Target;
/// TargetAsmBackend - Generic interface to target specific assembler backends.
class TargetAsmBackend {
TargetAsmBackend(const TargetAsmBackend &); // DO NOT IMPLEMENT
void operator=(const TargetAsmBackend &); // DO NOT IMPLEMENT
protected: // Can only create subclasses.
TargetAsmBackend(const Target &);
/// TheTarget - The Target that this machine was created for.
const Target &TheTarget;
public:
virtual ~TargetAsmBackend();
const Target &getTarget() const { return TheTarget; }
/// hasAbsolutizedSet - Check whether this target "absolutizes"
/// assignments. That is, given code like:
/// a:
/// ...
/// b:
/// tmp = a - b
/// .long tmp
/// will the value of 'tmp' be a relocatable expression, or the assembly time
/// value of L0 - L1. This distinction is only relevant for platforms that
/// support scattered symbols, since in the absence of scattered symbols (a -
/// b) cannot change after assembly.
virtual bool hasAbsolutizedSet() const { return false; }
/// hasScatteredSymbols - Check whether this target supports scattered
/// symbols. If so, the assembler should assume that atoms can be scattered by
/// the linker. In particular, this means that the offsets between symbols
/// which are in distinct atoms is not known at link time, and the assembler
/// must generate fixups and relocations appropriately.
///
/// Note that the assembler currently does not reason about atoms, instead it
/// assumes all temporary symbols reside in the "current atom".
virtual bool hasScatteredSymbols() const { return false; }
/// doesSectionRequireSymbols - Check whether the given section requires that
/// all symbols (even temporaries) have symbol table entries.
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
return false;
}
};
} // End llvm namespace
#endif
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