#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/Target/TargetAsmInfo.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
//===----------------------------------------------------------------------===//
// ELFCodeEmitter Implementation
/// startFunction - This callback is invoked when a new machine function is
/// about to be emitted.
void ELFCodeEmitter::startFunction(MachineFunction &MF) {
- DOUT << "processing function: " << MF.getFunction()->getName() << "\n";
+ DEBUG(dbgs() << "processing function: "
+ << MF.getFunction()->getName() << "\n");
// Get the ELF Section that this function belongs in.
- ES = &EW.getTextSection();
+ ES = &EW.getTextSection(MF.getFunction());
// Set the desired binary object to be used by the code emitters
setBinaryObject(ES);
ES->emitAlignment(Align);
// Update the section alignment if needed.
- if (ES->Align < Align) ES->Align = Align;
+ 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
bool ELFCodeEmitter::finishFunction(MachineFunction &MF) {
// Add a symbol to represent the function.
const Function *F = MF.getFunction();
- ELFSym *FnSym = new ELFSym(F);
- FnSym->setType(ELFSym::STT_FUNC);
- FnSym->setBind(EW.getGlobalELFBinding(F));
- FnSym->setVisibility(EW.getGlobalELFVisibility(F));
+ ELFSym *FnSym = ELFSym::getGV(F, EW.getGlobalELFBinding(F), ELFSym::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);
- // Emit constant pool to appropriate section(s)
- emitConstantPool(MF.getConstantPool());
-
- // Emit jump tables to appropriate section
- emitJumpTables(MF.getJumpTableInfo());
+ // 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);
+ }
+ }
- // Relocations
- // -----------
// 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.
+ // 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.PendingGlobals.insert(MR.getGlobalValue());
+ 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.setConstantVal(CPSections[MR.getConstantPoolIndex()]);
MR.setResultPointer((void*)Addr);
} else if (MR.isJumpTableIndex()) {
+ ELFSection &JTSection = EW.getJumpTableSection();
Addr = getJumpTableEntryAddress(MR.getJumpTableIndex());
- MR.setConstantVal(JumpTableSectionIdx);
+ MR.setConstantVal(JTSection.SectionIdx);
MR.setResultPointer((void*)Addr);
} else {
llvm_unreachable("Unhandled relocation type");
}
// Clear per-function data structures.
+ JTRelocations.clear();
Relocations.clear();
CPLocations.clear();
CPSections.clear();
"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();
- JumpTableSectionIdx = JTSection.SectionIdx;
-
- // Entries in the JT Section are relocated against the text section
- ELFSection &TextSection = EW.getTextSection();
// 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;
- DOUT << "JTSection.size(): " << JTSection.size() << "\n";
- DOUT << "JTLocations.size: " << JTLocations.size() << "\n";
-
// Record JT 'i' offset in the JT section
JTLocations.push_back(JTSection.size());
for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi) {
unsigned MachineRelTy = TEW->getAbsoluteLabelMachineRelTy();
MachineRelocation MR =
- MachineRelocation::getBB(JTSection.size(),
- MachineRelTy,
- MBBs[mi]);
-
- // Offset of JT 'i' in JT section
- MR.setResultPointer((void*)getMachineBasicBlockAddress(MBBs[mi]));
- MR.setConstantVal(TextSection.SectionIdx);
+ MachineRelocation::getBB(JTSection.size(), MachineRelTy, MBBs[mi]);
// Add the relocation to the Jump Table section
- JTSection.addRelocation(MR);
+ JTRelocations.push_back(MR);
// Output placeholder for MBB in the JT section
- JTSection.emitWord(0);
+ for (unsigned s=0; s < EntrySize; ++s)
+ JTSection.emitByte(0);
}
}
}
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