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-rw-r--r--lib/CodeGen/ELFCodeEmitter.cpp205
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diff --git a/lib/CodeGen/ELFCodeEmitter.cpp b/lib/CodeGen/ELFCodeEmitter.cpp
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-//===-- 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.
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "elfce"
-
-#include "ELF.h"
-#include "ELFWriter.h"
-#include "ELFCodeEmitter.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Function.h"
-#include "llvm/CodeGen/BinaryObject.h"
-#include "llvm/CodeGen/MachineConstantPool.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineJumpTableInfo.h"
-#include "llvm/CodeGen/MachineRelocation.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetELFWriterInfo.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
-
-//===----------------------------------------------------------------------===//
-// ELFCodeEmitter Implementation
-//===----------------------------------------------------------------------===//
-
-namespace llvm {
-
-/// startFunction - This callback is invoked when a new machine function is
-/// about to be emitted.
-void ELFCodeEmitter::startFunction(MachineFunction &MF) {
- DEBUG(dbgs() << "processing function: "
- << MF.getFunction()->getName() << "\n");
-
- // Get the ELF Section that this function belongs in.
- ES = &EW.getTextSection(MF.getFunction());
-
- // Set the desired binary object to be used by the code emitters
- setBinaryObject(ES);
-
- // Get the function alignment in bytes
- unsigned Align = (1 << MF.getAlignment());
-
- // The function must start on its required alignment
- ES->emitAlignment(Align);
-
- // Update the section alignment if needed.
- ES->Align = std::max(ES->Align, Align);
-
- // Record the function start offset
- FnStartOff = ES->getCurrentPCOffset();
-
- // Emit constant pool and jump tables to their appropriate sections.
- // They need to be emitted before the function because in some targets
- // the later may reference JT or CP entry address.
- emitConstantPool(MF.getConstantPool());
- if (MF.getJumpTableInfo())
- emitJumpTables(MF.getJumpTableInfo());
-}
-
-/// finishFunction - This callback is invoked after the function is completely
-/// finished.
-bool ELFCodeEmitter::finishFunction(MachineFunction &MF) {
- // Add a symbol to represent the function.
- const Function *F = MF.getFunction();
- ELFSym *FnSym = ELFSym::getGV(F, EW.getGlobalELFBinding(F), ELF::STT_FUNC,
- EW.getGlobalELFVisibility(F));
- FnSym->SectionIdx = ES->SectionIdx;
- FnSym->Size = ES->getCurrentPCOffset()-FnStartOff;
- EW.AddPendingGlobalSymbol(F, true);
-
- // Offset from start of Section
- FnSym->Value = FnStartOff;
-
- if (!F->hasPrivateLinkage())
- EW.SymbolList.push_back(FnSym);
-
- // Patch up Jump Table Section relocations to use the real MBBs offsets
- // now that the MBB label offsets inside the function are known.
- if (MF.getJumpTableInfo()) {
- ELFSection &JTSection = EW.getJumpTableSection();
- for (std::vector<MachineRelocation>::iterator MRI = JTRelocations.begin(),
- MRE = JTRelocations.end(); MRI != MRE; ++MRI) {
- MachineRelocation &MR = *MRI;
- uintptr_t MBBOffset = getMachineBasicBlockAddress(MR.getBasicBlock());
- MR.setResultPointer((void*)MBBOffset);
- MR.setConstantVal(ES->SectionIdx);
- JTSection.addRelocation(MR);
- }
- }
-
- // If we have emitted any relocations to function-specific objects such as
- // basic blocks, constant pools entries, or jump tables, record their
- // addresses now so that we can rewrite them with the correct addresses later
- for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
- MachineRelocation &MR = Relocations[i];
- intptr_t Addr;
- if (MR.isGlobalValue()) {
- EW.AddPendingGlobalSymbol(MR.getGlobalValue());
- } else if (MR.isExternalSymbol()) {
- EW.AddPendingExternalSymbol(MR.getExternalSymbol());
- } else if (MR.isBasicBlock()) {
- Addr = getMachineBasicBlockAddress(MR.getBasicBlock());
- MR.setConstantVal(ES->SectionIdx);
- MR.setResultPointer((void*)Addr);
- } else if (MR.isConstantPoolIndex()) {
- Addr = getConstantPoolEntryAddress(MR.getConstantPoolIndex());
- MR.setConstantVal(CPSections[MR.getConstantPoolIndex()]);
- MR.setResultPointer((void*)Addr);
- } else if (MR.isJumpTableIndex()) {
- ELFSection &JTSection = EW.getJumpTableSection();
- Addr = getJumpTableEntryAddress(MR.getJumpTableIndex());
- MR.setConstantVal(JTSection.SectionIdx);
- MR.setResultPointer((void*)Addr);
- } else {
- llvm_unreachable("Unhandled relocation type");
- }
- ES->addRelocation(MR);
- }
-
- // Clear per-function data structures.
- JTRelocations.clear();
- Relocations.clear();
- CPLocations.clear();
- CPSections.clear();
- JTLocations.clear();
- MBBLocations.clear();
- return false;
-}
-
-/// emitConstantPool - For each constant pool entry, figure out which section
-/// the constant should live in and emit the constant
-void ELFCodeEmitter::emitConstantPool(MachineConstantPool *MCP) {
- const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
- if (CP.empty()) return;
-
- // TODO: handle PIC codegen
- assert(TM.getRelocationModel() != Reloc::PIC_ &&
- "PIC codegen not yet handled for elf constant pools!");
-
- for (unsigned i = 0, e = CP.size(); i != e; ++i) {
- MachineConstantPoolEntry CPE = CP[i];
-
- // Record the constant pool location and the section index
- ELFSection &CstPool = EW.getConstantPoolSection(CPE);
- CPLocations.push_back(CstPool.size());
- CPSections.push_back(CstPool.SectionIdx);
-
- if (CPE.isMachineConstantPoolEntry())
- assert(0 && "CPE.isMachineConstantPoolEntry not supported yet");
-
- // Emit the constant to constant pool section
- EW.EmitGlobalConstant(CPE.Val.ConstVal, CstPool);
- }
-}
-
-/// emitJumpTables - Emit all the jump tables for a given jump table info
-/// record to the appropriate section.
-void ELFCodeEmitter::emitJumpTables(MachineJumpTableInfo *MJTI) {
- const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
- if (JT.empty()) return;
-
- // FIXME: handle PIC codegen
- assert(TM.getRelocationModel() != Reloc::PIC_ &&
- "PIC codegen not yet handled for elf jump tables!");
-
- const TargetELFWriterInfo *TEW = TM.getELFWriterInfo();
- unsigned EntrySize = 4; //MJTI->getEntrySize();
-
- // Get the ELF Section to emit the jump table
- ELFSection &JTSection = EW.getJumpTableSection();
-
- // For each JT, record its offset from the start of the section
- for (unsigned i = 0, e = JT.size(); i != e; ++i) {
- const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
-
- // Record JT 'i' offset in the JT section
- JTLocations.push_back(JTSection.size());
-
- // Each MBB entry in the Jump table section has a relocation entry
- // against the current text section.
- for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi) {
- unsigned MachineRelTy = TEW->getAbsoluteLabelMachineRelTy();
- MachineRelocation MR =
- MachineRelocation::getBB(JTSection.size(), MachineRelTy, MBBs[mi]);
-
- // Add the relocation to the Jump Table section
- JTRelocations.push_back(MR);
-
- // Output placeholder for MBB in the JT section
- for (unsigned s=0; s < EntrySize; ++s)
- JTSection.emitByte(0);
- }
- }
-}
-
-} // end namespace llvm
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