mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-10-10 16:24:04 +00:00
4cb31436bd
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72785 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
//===-- lib/CodeGen/ELFCodeEmitter.cpp ------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ELFCodeEmitter.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/CodeGen/MachineConstantPool.h"
|
|
#include "llvm/CodeGen/MachineJumpTableInfo.h"
|
|
#include "llvm/Target/TargetAsmInfo.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Support/Mangler.h"
|
|
#include "llvm/Support/OutputBuffer.h"
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ELFCodeEmitter Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
namespace llvm {
|
|
|
|
/// startFunction - This callback is invoked when a new machine function is
|
|
/// about to be emitted.
|
|
void ELFCodeEmitter::startFunction(MachineFunction &F) {
|
|
// Align the output buffer to the appropriate alignment.
|
|
unsigned Align = 16; // FIXME: GENERICIZE!!
|
|
// Get the ELF Section that this function belongs in.
|
|
ES = &EW.getSection(".text", ELFWriter::ELFSection::SHT_PROGBITS,
|
|
ELFWriter::ELFSection::SHF_EXECINSTR |
|
|
ELFWriter::ELFSection::SHF_ALLOC);
|
|
OutBuffer = &ES->SectionData;
|
|
cerr << "FIXME: This code needs to be updated for changes in the "
|
|
<< "CodeEmitter interfaces. In particular, this should set "
|
|
<< "BufferBegin/BufferEnd/CurBufferPtr, not deal with OutBuffer!";
|
|
abort();
|
|
|
|
// Upgrade the section alignment if required.
|
|
if (ES->Align < Align) ES->Align = Align;
|
|
|
|
// Add padding zeros to the end of the buffer to make sure that the
|
|
// function will start on the correct byte alignment within the section.
|
|
OutputBuffer OB(*OutBuffer,
|
|
TM.getTargetData()->getPointerSizeInBits() == 64,
|
|
TM.getTargetData()->isLittleEndian());
|
|
OB.align(Align);
|
|
FnStart = OutBuffer->size();
|
|
}
|
|
|
|
/// finishFunction - This callback is invoked after the function is completely
|
|
/// finished.
|
|
bool ELFCodeEmitter::finishFunction(MachineFunction &F) {
|
|
// We now know the size of the function, add a symbol to represent it.
|
|
ELFWriter::ELFSym FnSym(F.getFunction());
|
|
|
|
// Figure out the binding (linkage) of the symbol.
|
|
switch (F.getFunction()->getLinkage()) {
|
|
default:
|
|
// appending linkage is illegal for functions.
|
|
assert(0 && "Unknown linkage type!");
|
|
case GlobalValue::ExternalLinkage:
|
|
FnSym.SetBind(ELFWriter::ELFSym::STB_GLOBAL);
|
|
break;
|
|
case GlobalValue::LinkOnceAnyLinkage:
|
|
case GlobalValue::LinkOnceODRLinkage:
|
|
case GlobalValue::WeakAnyLinkage:
|
|
case GlobalValue::WeakODRLinkage:
|
|
FnSym.SetBind(ELFWriter::ELFSym::STB_WEAK);
|
|
break;
|
|
case GlobalValue::PrivateLinkage:
|
|
assert (0 && "PrivateLinkage should not be in the symbol table.");
|
|
case GlobalValue::InternalLinkage:
|
|
FnSym.SetBind(ELFWriter::ELFSym::STB_LOCAL);
|
|
break;
|
|
}
|
|
|
|
ES->Size = OutBuffer->size();
|
|
|
|
FnSym.SetType(ELFWriter::ELFSym::STT_FUNC);
|
|
FnSym.SectionIdx = ES->SectionIdx;
|
|
FnSym.Value = FnStart; // Value = Offset from start of Section.
|
|
FnSym.Size = OutBuffer->size()-FnStart;
|
|
|
|
// Finally, add it to the symtab.
|
|
EW.SymbolTable.push_back(FnSym);
|
|
return false;
|
|
}
|
|
|
|
} // end namespace llvm
|