Hook up llc's -filetype=obj to use MCStreamer if an MCCodeEmitter is available.
Remove most of old Mach-O Writer support, it has been replaced by MCMachOStreamer
Further refactoring to completely remove MachOWriter and drive the object file
writer with the AsmPrinter MCInst/MCSection logic is forthcoming.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93527 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachOWriter.cpp b/lib/CodeGen/MachOWriter.cpp
index 337eab1..cab71ce 100644
--- a/lib/CodeGen/MachOWriter.cpp
+++ b/lib/CodeGen/MachOWriter.cpp
@@ -22,33 +22,31 @@
//
//===----------------------------------------------------------------------===//
-#include "MachO.h"
#include "MachOWriter.h"
-#include "MachOCodeEmitter.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Module.h"
-#include "llvm/PassManager.h"
+#include "llvm/Function.h"
+#include "llvm/CodeGen/FileWriters.h"
+#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetMachOWriterInfo.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/Mangler.h"
-#include "llvm/Support/OutputBuffer.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Mangler.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+using namespace llvm;
-namespace llvm {
-
-/// AddMachOWriter - Concrete function to add the Mach-O writer to the function
-/// pass manager.
-ObjectCodeEmitter *AddMachOWriter(PassManagerBase &PM,
- raw_ostream &O,
- TargetMachine &TM) {
- MachOWriter *MOW = new MachOWriter(O, TM);
- PM.add(MOW);
- return MOW->getObjectCodeEmitter();
+namespace llvm {
+MachineFunctionPass *createMachOWriter(formatted_raw_ostream &O,
+ TargetMachine &TM,
+ const MCAsmInfo *T,
+ MCCodeEmitter *MCE) {
+ return new MachOWriter(O, TM, T, MCE);
+}
}
//===----------------------------------------------------------------------===//
@@ -57,722 +55,83 @@
char MachOWriter::ID = 0;
-MachOWriter::MachOWriter(raw_ostream &o, TargetMachine &tm)
- : MachineFunctionPass(&ID), O(o), TM(tm) {
- is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
- isLittleEndian = TM.getTargetData()->isLittleEndian();
-
- MAI = TM.getMCAsmInfo();
-
- // Create the machine code emitter object for this target.
- MachOCE = new MachOCodeEmitter(*this, *getTextSection(true));
+MachOWriter::MachOWriter(formatted_raw_ostream &o, TargetMachine &tm,
+ const MCAsmInfo *T, MCCodeEmitter *MCE)
+ : MachineFunctionPass(&ID), O(o), TM(tm), MAI(T), MCCE(MCE),
+ OutContext(*new MCContext()),
+ OutStreamer(*createMachOStreamer(OutContext, O, MCCE)) {
}
MachOWriter::~MachOWriter() {
- delete MachOCE;
+ delete &OutStreamer;
+ delete &OutContext;
+ delete MCCE;
}
bool MachOWriter::doInitialization(Module &M) {
- // Set the magic value, now that we know the pointer size and endianness
- Header.setMagic(isLittleEndian, is64Bit);
+ Mang = new Mangler(M, MAI->getGlobalPrefix(), MAI->getPrivateGlobalPrefix(),
+ MAI->getLinkerPrivateGlobalPrefix());
+
+ if (MAI->doesAllowQuotesInName())
+ Mang->setUseQuotes(true);
+
+ if (MAI->doesAllowNameToStartWithDigit())
+ Mang->setSymbolsCanStartWithDigit(true);
+
+ // Initialize TargetLoweringObjectFile.
+ TM.getTargetLowering()->getObjFileLowering().Initialize(OutContext, TM);
- // Set the file type
- // FIXME: this only works for object files, we do not support the creation
- // of dynamic libraries or executables at this time.
- Header.filetype = MachOHeader::MH_OBJECT;
-
- Mang = new Mangler(M);
- return false;
-}
-
-bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
return false;
}
/// doFinalization - Now that the module has been completely processed, emit
/// the Mach-O file to 'O'.
bool MachOWriter::doFinalization(Module &M) {
- // FIXME: we don't handle debug info yet, we should probably do that.
- // Okay, the.text section has been completed, build the .data, .bss, and
- // "common" sections next.
-
- for (Module::global_iterator I = M.global_begin(), E = M.global_end();
- I != E; ++I)
- EmitGlobal(I);
-
- // Emit the header and load commands.
- EmitHeaderAndLoadCommands();
-
- // Emit the various sections and their relocation info.
- EmitSections();
- EmitRelocations();
-
- // Write the symbol table and the string table to the end of the file.
- O.write((char*)&SymT[0], SymT.size());
- O.write((char*)&StrT[0], StrT.size());
-
- // We are done with the abstract symbols.
- SectionList.clear();
- SymbolTable.clear();
- DynamicSymbolTable.clear();
-
// Release the name mangler object.
delete Mang; Mang = 0;
+
+ OutStreamer.Finish();
return false;
}
-// getConstSection - Get constant section for Constant 'C'
-MachOSection *MachOWriter::getConstSection(Constant *C) {
- const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
- if (CVA && CVA->isCString())
- return getSection("__TEXT", "__cstring",
- MachOSection::S_CSTRING_LITERALS);
+bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
+ const Function *F = MF.getFunction();
+ TargetLoweringObjectFile &TLOF = TM.getTargetLowering()->getObjFileLowering();
+ const MCSection *S = TLOF.SectionForGlobal(F, Mang, TM);
+ OutStreamer.SwitchSection(S);
- const Type *Ty = C->getType();
- if (Ty->isPrimitiveType() || Ty->isInteger()) {
- unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
- switch(Size) {
- default: break; // Fall through to __TEXT,__const
- case 4:
- return getSection("__TEXT", "__literal4",
- MachOSection::S_4BYTE_LITERALS);
- case 8:
- return getSection("__TEXT", "__literal8",
- MachOSection::S_8BYTE_LITERALS);
- case 16:
- return getSection("__TEXT", "__literal16",
- MachOSection::S_16BYTE_LITERALS);
- }
- }
- return getSection("__TEXT", "__const");
-}
+ for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+ I != E; ++I) {
+ // Print a label for the basic block.
+ for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
+ II != IE; ++II) {
+ const MachineInstr *MI = II;
+ MCInst OutMI;
+ OutMI.setOpcode(MI->getOpcode());
-// getJumpTableSection - Select the Jump Table section
-MachOSection *MachOWriter::getJumpTableSection() {
- if (TM.getRelocationModel() == Reloc::PIC_)
- return getTextSection(false);
- else
- return getSection("__TEXT", "__const");
-}
+ for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = MI->getOperand(i);
+ MCOperand MCOp;
-// getSection - Return the section with the specified name, creating a new
-// section if one does not already exist.
-MachOSection *MachOWriter::getSection(const std::string &seg,
- const std::string §,
- unsigned Flags /* = 0 */ ) {
- MachOSection *MOS = SectionLookup[seg+sect];
- if (MOS) return MOS;
-
- MOS = new MachOSection(seg, sect);
- SectionList.push_back(MOS);
- MOS->Index = SectionList.size();
- MOS->flags = MachOSection::S_REGULAR | Flags;
- SectionLookup[seg+sect] = MOS;
- return MOS;
-}
-
-// getTextSection - Return text section with different flags for code/data
-MachOSection *MachOWriter::getTextSection(bool isCode /* = true */ ) {
- if (isCode)
- return getSection("__TEXT", "__text",
- MachOSection::S_ATTR_PURE_INSTRUCTIONS |
- MachOSection::S_ATTR_SOME_INSTRUCTIONS);
- else
- return getSection("__TEXT", "__text");
-}
-
-MachOSection *MachOWriter::getBSSSection() {
- return getSection("__DATA", "__bss", MachOSection::S_ZEROFILL);
-}
-
-// GetJTRelocation - Get a relocation a new BB relocation based
-// on target information.
-MachineRelocation MachOWriter::GetJTRelocation(unsigned Offset,
- MachineBasicBlock *MBB) const {
- return TM.getMachOWriterInfo()->GetJTRelocation(Offset, MBB);
-}
-
-// GetTargetRelocation - Returns the number of relocations.
-unsigned MachOWriter::GetTargetRelocation(MachineRelocation &MR,
- unsigned FromIdx, unsigned ToAddr,
- unsigned ToIndex, OutputBuffer &RelocOut,
- OutputBuffer &SecOut, bool Scattered,
- bool Extern) {
- return TM.getMachOWriterInfo()->GetTargetRelocation(MR, FromIdx, ToAddr,
- ToIndex, RelocOut,
- SecOut, Scattered,
- Extern);
-}
-
-void MachOWriter::AddSymbolToSection(MachOSection *Sec, GlobalVariable *GV) {
- const Type *Ty = GV->getType()->getElementType();
- unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
- unsigned Align = TM.getTargetData()->getPreferredAlignment(GV);
-
- // Reserve space in the .bss section for this symbol while maintaining the
- // desired section alignment, which must be at least as much as required by
- // this symbol.
- OutputBuffer SecDataOut(Sec->getData(), is64Bit, isLittleEndian);
-
- if (Align) {
- Align = Log2_32(Align);
- Sec->align = std::max(unsigned(Sec->align), Align);
-
- Sec->emitAlignment(Sec->align);
- }
- // Globals without external linkage apparently do not go in the symbol table.
- if (!GV->hasLocalLinkage()) {
- MachOSym Sym(GV, Mang->getMangledName(GV), Sec->Index, MAI);
- Sym.n_value = Sec->size();
- SymbolTable.push_back(Sym);
- }
-
- // Record the offset of the symbol, and then allocate space for it.
- // FIXME: remove when we have unified size + output buffer
-
- // Now that we know what section the GlovalVariable is going to be emitted
- // into, update our mappings.
- // FIXME: We may also need to update this when outputting non-GlobalVariable
- // GlobalValues such as functions.
-
- GVSection[GV] = Sec;
- GVOffset[GV] = Sec->size();
-
- // Allocate space in the section for the global.
- for (unsigned i = 0; i < Size; ++i)
- SecDataOut.outbyte(0);
-}
-
-void MachOWriter::EmitGlobal(GlobalVariable *GV) {
- const Type *Ty = GV->getType()->getElementType();
- unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
- bool NoInit = !GV->hasInitializer();
-
- // If this global has a zero initializer, it is part of the .bss or common
- // section.
- if (NoInit || GV->getInitializer()->isNullValue()) {
- // If this global is part of the common block, add it now. Variables are
- // part of the common block if they are zero initialized and allowed to be
- // merged with other symbols.
- if (NoInit || GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
- GV->hasCommonLinkage()) {
- MachOSym ExtOrCommonSym(GV, Mang->getMangledName(GV),
- MachOSym::NO_SECT, MAI);
- // For undefined (N_UNDF) external (N_EXT) types, n_value is the size in
- // bytes of the symbol.
- ExtOrCommonSym.n_value = Size;
- SymbolTable.push_back(ExtOrCommonSym);
- // Remember that we've seen this symbol
- GVOffset[GV] = Size;
- return;
- }
- // Otherwise, this symbol is part of the .bss section.
- MachOSection *BSS = getBSSSection();
- AddSymbolToSection(BSS, GV);
- return;
- }
-
- // Scalar read-only data goes in a literal section if the scalar is 4, 8, or
- // 16 bytes, or a cstring. Other read only data goes into a regular const
- // section. Read-write data goes in the data section.
- MachOSection *Sec = GV->isConstant() ? getConstSection(GV->getInitializer()) :
- getDataSection();
- AddSymbolToSection(Sec, GV);
- InitMem(GV->getInitializer(), GVOffset[GV], TM.getTargetData(), Sec);
-}
-
-
-
-void MachOWriter::EmitHeaderAndLoadCommands() {
- // Step #0: Fill in the segment load command size, since we need it to figure
- // out the rest of the header fields
-
- MachOSegment SEG("", is64Bit);
- SEG.nsects = SectionList.size();
- SEG.cmdsize = SEG.cmdSize(is64Bit) +
- SEG.nsects * SectionList[0]->cmdSize(is64Bit);
-
- // Step #1: calculate the number of load commands. We always have at least
- // one, for the LC_SEGMENT load command, plus two for the normal
- // and dynamic symbol tables, if there are any symbols.
- Header.ncmds = SymbolTable.empty() ? 1 : 3;
-
- // Step #2: calculate the size of the load commands
- Header.sizeofcmds = SEG.cmdsize;
- if (!SymbolTable.empty())
- Header.sizeofcmds += SymTab.cmdsize + DySymTab.cmdsize;
-
- // Step #3: write the header to the file
- // Local alias to shortenify coming code.
- std::vector<unsigned char> &FH = Header.HeaderData;
- OutputBuffer FHOut(FH, is64Bit, isLittleEndian);
-
- FHOut.outword(Header.magic);
- FHOut.outword(TM.getMachOWriterInfo()->getCPUType());
- FHOut.outword(TM.getMachOWriterInfo()->getCPUSubType());
- FHOut.outword(Header.filetype);
- FHOut.outword(Header.ncmds);
- FHOut.outword(Header.sizeofcmds);
- FHOut.outword(Header.flags);
- if (is64Bit)
- FHOut.outword(Header.reserved);
-
- // Step #4: Finish filling in the segment load command and write it out
- for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
- E = SectionList.end(); I != E; ++I)
- SEG.filesize += (*I)->size();
-
- SEG.vmsize = SEG.filesize;
- SEG.fileoff = Header.cmdSize(is64Bit) + Header.sizeofcmds;
-
- FHOut.outword(SEG.cmd);
- FHOut.outword(SEG.cmdsize);
- FHOut.outstring(SEG.segname, 16);
- FHOut.outaddr(SEG.vmaddr);
- FHOut.outaddr(SEG.vmsize);
- FHOut.outaddr(SEG.fileoff);
- FHOut.outaddr(SEG.filesize);
- FHOut.outword(SEG.maxprot);
- FHOut.outword(SEG.initprot);
- FHOut.outword(SEG.nsects);
- FHOut.outword(SEG.flags);
-
- // Step #5: Finish filling in the fields of the MachOSections
- uint64_t currentAddr = 0;
- for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
- E = SectionList.end(); I != E; ++I) {
- MachOSection *MOS = *I;
- MOS->addr = currentAddr;
- MOS->offset = currentAddr + SEG.fileoff;
- // FIXME: do we need to do something with alignment here?
- currentAddr += MOS->size();
- }
-
- // Step #6: Emit the symbol table to temporary buffers, so that we know the
- // size of the string table when we write the next load command. This also
- // sorts and assigns indices to each of the symbols, which is necessary for
- // emitting relocations to externally-defined objects.
- BufferSymbolAndStringTable();
-
- // Step #7: Calculate the number of relocations for each section and write out
- // the section commands for each section
- currentAddr += SEG.fileoff;
- for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
- E = SectionList.end(); I != E; ++I) {
- MachOSection *MOS = *I;
-
- // Convert the relocations to target-specific relocations, and fill in the
- // relocation offset for this section.
- CalculateRelocations(*MOS);
- MOS->reloff = MOS->nreloc ? currentAddr : 0;
- currentAddr += MOS->nreloc * 8;
-
- // write the finalized section command to the output buffer
- FHOut.outstring(MOS->sectname, 16);
- FHOut.outstring(MOS->segname, 16);
- FHOut.outaddr(MOS->addr);
- FHOut.outaddr(MOS->size());
- FHOut.outword(MOS->offset);
- FHOut.outword(MOS->align);
- FHOut.outword(MOS->reloff);
- FHOut.outword(MOS->nreloc);
- FHOut.outword(MOS->flags);
- FHOut.outword(MOS->reserved1);
- FHOut.outword(MOS->reserved2);
- if (is64Bit)
- FHOut.outword(MOS->reserved3);
- }
-
- // Step #8: Emit LC_SYMTAB/LC_DYSYMTAB load commands
- SymTab.symoff = currentAddr;
- SymTab.nsyms = SymbolTable.size();
- SymTab.stroff = SymTab.symoff + SymT.size();
- SymTab.strsize = StrT.size();
- FHOut.outword(SymTab.cmd);
- FHOut.outword(SymTab.cmdsize);
- FHOut.outword(SymTab.symoff);
- FHOut.outword(SymTab.nsyms);
- FHOut.outword(SymTab.stroff);
- FHOut.outword(SymTab.strsize);
-
- // FIXME: set DySymTab fields appropriately
- // We should probably just update these in BufferSymbolAndStringTable since
- // thats where we're partitioning up the different kinds of symbols.
- FHOut.outword(DySymTab.cmd);
- FHOut.outword(DySymTab.cmdsize);
- FHOut.outword(DySymTab.ilocalsym);
- FHOut.outword(DySymTab.nlocalsym);
- FHOut.outword(DySymTab.iextdefsym);
- FHOut.outword(DySymTab.nextdefsym);
- FHOut.outword(DySymTab.iundefsym);
- FHOut.outword(DySymTab.nundefsym);
- FHOut.outword(DySymTab.tocoff);
- FHOut.outword(DySymTab.ntoc);
- FHOut.outword(DySymTab.modtaboff);
- FHOut.outword(DySymTab.nmodtab);
- FHOut.outword(DySymTab.extrefsymoff);
- FHOut.outword(DySymTab.nextrefsyms);
- FHOut.outword(DySymTab.indirectsymoff);
- FHOut.outword(DySymTab.nindirectsyms);
- FHOut.outword(DySymTab.extreloff);
- FHOut.outword(DySymTab.nextrel);
- FHOut.outword(DySymTab.locreloff);
- FHOut.outword(DySymTab.nlocrel);
-
- O.write((char*)&FH[0], FH.size());
-}
-
-/// EmitSections - Now that we have constructed the file header and load
-/// commands, emit the data for each section to the file.
-void MachOWriter::EmitSections() {
- for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
- E = SectionList.end(); I != E; ++I)
- // Emit the contents of each section
- if ((*I)->size())
- O.write((char*)&(*I)->getData()[0], (*I)->size());
-}
-
-/// EmitRelocations - emit relocation data from buffer.
-void MachOWriter::EmitRelocations() {
- for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
- E = SectionList.end(); I != E; ++I)
- // Emit the relocation entry data for each section.
- if ((*I)->RelocBuffer.size())
- O.write((char*)&(*I)->RelocBuffer[0], (*I)->RelocBuffer.size());
-}
-
-/// BufferSymbolAndStringTable - Sort the symbols we encountered and assign them
-/// each a string table index so that they appear in the correct order in the
-/// output file.
-void MachOWriter::BufferSymbolAndStringTable() {
- // The order of the symbol table is:
- // 1. local symbols
- // 2. defined external symbols (sorted by name)
- // 3. undefined external symbols (sorted by name)
-
- // Before sorting the symbols, check the PendingGlobals for any undefined
- // globals that need to be put in the symbol table.
- for (std::vector<GlobalValue*>::iterator I = PendingGlobals.begin(),
- E = PendingGlobals.end(); I != E; ++I) {
- if (GVOffset[*I] == 0 && GVSection[*I] == 0) {
- MachOSym UndfSym(*I, Mang->getMangledName(*I), MachOSym::NO_SECT, MAI);
- SymbolTable.push_back(UndfSym);
- GVOffset[*I] = -1;
- }
- }
-
- // Sort the symbols by name, so that when we partition the symbols by scope
- // of definition, we won't have to sort by name within each partition.
- std::sort(SymbolTable.begin(), SymbolTable.end(), MachOSym::SymCmp());
-
- // Parition the symbol table entries so that all local symbols come before
- // all symbols with external linkage. { 1 | 2 3 }
- std::partition(SymbolTable.begin(), SymbolTable.end(),
- MachOSym::PartitionByLocal);
-
- // Advance iterator to beginning of external symbols and partition so that
- // all external symbols defined in this module come before all external
- // symbols defined elsewhere. { 1 | 2 | 3 }
- for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
- E = SymbolTable.end(); I != E; ++I) {
- if (!MachOSym::PartitionByLocal(*I)) {
- std::partition(I, E, MachOSym::PartitionByDefined);
- break;
- }
- }
-
- // Calculate the starting index for each of the local, extern defined, and
- // undefined symbols, as well as the number of each to put in the LC_DYSYMTAB
- // load command.
- for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
- E = SymbolTable.end(); I != E; ++I) {
- if (MachOSym::PartitionByLocal(*I)) {
- ++DySymTab.nlocalsym;
- ++DySymTab.iextdefsym;
- ++DySymTab.iundefsym;
- } else if (MachOSym::PartitionByDefined(*I)) {
- ++DySymTab.nextdefsym;
- ++DySymTab.iundefsym;
- } else {
- ++DySymTab.nundefsym;
- }
- }
-
- // Write out a leading zero byte when emitting string table, for n_strx == 0
- // which means an empty string.
- OutputBuffer StrTOut(StrT, is64Bit, isLittleEndian);
- StrTOut.outbyte(0);
-
- // The order of the string table is:
- // 1. strings for external symbols
- // 2. strings for local symbols
- // Since this is the opposite order from the symbol table, which we have just
- // sorted, we can walk the symbol table backwards to output the string table.
- for (std::vector<MachOSym>::reverse_iterator I = SymbolTable.rbegin(),
- E = SymbolTable.rend(); I != E; ++I) {
- if (I->GVName == "") {
- I->n_strx = 0;
- } else {
- I->n_strx = StrT.size();
- StrTOut.outstring(I->GVName, I->GVName.length()+1);
- }
- }
-
- OutputBuffer SymTOut(SymT, is64Bit, isLittleEndian);
-
- unsigned index = 0;
- for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
- E = SymbolTable.end(); I != E; ++I, ++index) {
- // Add the section base address to the section offset in the n_value field
- // to calculate the full address.
- // FIXME: handle symbols where the n_value field is not the address
- GlobalValue *GV = const_cast<GlobalValue*>(I->GV);
- if (GV && GVSection[GV])
- I->n_value += GVSection[GV]->addr;
- if (GV && (GVOffset[GV] == -1))
- GVOffset[GV] = index;
-
- // Emit nlist to buffer
- SymTOut.outword(I->n_strx);
- SymTOut.outbyte(I->n_type);
- SymTOut.outbyte(I->n_sect);
- SymTOut.outhalf(I->n_desc);
- SymTOut.outaddr(I->n_value);
- }
-}
-
-/// CalculateRelocations - For each MachineRelocation in the current section,
-/// calculate the index of the section containing the object to be relocated,
-/// and the offset into that section. From this information, create the
-/// appropriate target-specific MachORelocation type and add buffer it to be
-/// written out after we are finished writing out sections.
-void MachOWriter::CalculateRelocations(MachOSection &MOS) {
- std::vector<MachineRelocation> Relocations = MOS.getRelocations();
- for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
- MachineRelocation &MR = Relocations[i];
- unsigned TargetSection = MR.getConstantVal();
- unsigned TargetAddr = 0;
- unsigned TargetIndex = 0;
-
- // This is a scattered relocation entry if it points to a global value with
- // a non-zero offset.
- bool Scattered = false;
- bool Extern = false;
-
- // Since we may not have seen the GlobalValue we were interested in yet at
- // the time we emitted the relocation for it, fix it up now so that it
- // points to the offset into the correct section.
- if (MR.isGlobalValue()) {
- GlobalValue *GV = MR.getGlobalValue();
- MachOSection *MOSPtr = GVSection[GV];
- intptr_t Offset = GVOffset[GV];
-
- // If we have never seen the global before, it must be to a symbol
- // defined in another module (N_UNDF).
- if (!MOSPtr) {
- // FIXME: need to append stub suffix
- Extern = true;
- TargetAddr = 0;
- TargetIndex = GVOffset[GV];
- } else {
- Scattered = TargetSection != 0;
- TargetSection = MOSPtr->Index;
- }
- MR.setResultPointer((void*)Offset);
- }
-
- // If the symbol is locally defined, pass in the address of the section and
- // the section index to the code which will generate the target relocation.
- if (!Extern) {
- MachOSection &To = *SectionList[TargetSection - 1];
- TargetAddr = To.addr;
- TargetIndex = To.Index;
- }
-
- OutputBuffer RelocOut(MOS.RelocBuffer, is64Bit, isLittleEndian);
- OutputBuffer SecOut(MOS.getData(), is64Bit, isLittleEndian);
-
- MOS.nreloc += GetTargetRelocation(MR, MOS.Index, TargetAddr, TargetIndex,
- RelocOut, SecOut, Scattered, Extern);
- }
-}
-
-// InitMem - Write the value of a Constant to the specified memory location,
-// converting it into bytes and relocations.
-void MachOWriter::InitMem(const Constant *C, uintptr_t Offset,
- const TargetData *TD, MachOSection* mos) {
- typedef std::pair<const Constant*, intptr_t> CPair;
- std::vector<CPair> WorkList;
- uint8_t *Addr = &mos->getData()[0];
-
- WorkList.push_back(CPair(C,(intptr_t)Addr + Offset));
-
- intptr_t ScatteredOffset = 0;
-
- while (!WorkList.empty()) {
- const Constant *PC = WorkList.back().first;
- intptr_t PA = WorkList.back().second;
- WorkList.pop_back();
-
- if (isa<UndefValue>(PC)) {
- continue;
- } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(PC)) {
- unsigned ElementSize =
- TD->getTypeAllocSize(CP->getType()->getElementType());
- for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
- WorkList.push_back(CPair(CP->getOperand(i), PA+i*ElementSize));
- } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(PC)) {
- //
- // FIXME: Handle ConstantExpression. See EE::getConstantValue()
- //
- switch (CE->getOpcode()) {
- case Instruction::GetElementPtr: {
- SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
- ScatteredOffset = TD->getIndexedOffset(CE->getOperand(0)->getType(),
- &Indices[0], Indices.size());
- WorkList.push_back(CPair(CE->getOperand(0), PA));
- break;
- }
- case Instruction::Add:
- default:
- dbgs() << "ConstantExpr not handled as global var init: " << *CE <<"\n";
- llvm_unreachable(0);
- }
- } else if (PC->getType()->isSingleValueType()) {
- unsigned char *ptr = (unsigned char *)PA;
- switch (PC->getType()->getTypeID()) {
- case Type::IntegerTyID: {
- unsigned NumBits = cast<IntegerType>(PC->getType())->getBitWidth();
- uint64_t val = cast<ConstantInt>(PC)->getZExtValue();
- if (NumBits <= 8)
- ptr[0] = val;
- else if (NumBits <= 16) {
- if (TD->isBigEndian())
- val = ByteSwap_16(val);
- ptr[0] = val;
- ptr[1] = val >> 8;
- } else if (NumBits <= 32) {
- if (TD->isBigEndian())
- val = ByteSwap_32(val);
- ptr[0] = val;
- ptr[1] = val >> 8;
- ptr[2] = val >> 16;
- ptr[3] = val >> 24;
- } else if (NumBits <= 64) {
- if (TD->isBigEndian())
- val = ByteSwap_64(val);
- ptr[0] = val;
- ptr[1] = val >> 8;
- ptr[2] = val >> 16;
- ptr[3] = val >> 24;
- ptr[4] = val >> 32;
- ptr[5] = val >> 40;
- ptr[6] = val >> 48;
- ptr[7] = val >> 56;
- } else {
- llvm_unreachable("Not implemented: bit widths > 64");
+ switch (MO.getType()) {
+ default:
+ MI->dump();
+ llvm_unreachable("unknown operand type");
+ case MachineOperand::MO_Register:
+ // Ignore all implicit register operands.
+ if (MO.isImplicit()) continue;
+ MCOp = MCOperand::CreateReg(MO.getReg());
+ break;
+ case MachineOperand::MO_Immediate:
+ MCOp = MCOperand::CreateImm(MO.getImm());
+ break;
}
- break;
+ OutMI.addOperand(MCOp);
}
- case Type::FloatTyID: {
- uint32_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
- getZExtValue();
- if (TD->isBigEndian())
- val = ByteSwap_32(val);
- ptr[0] = val;
- ptr[1] = val >> 8;
- ptr[2] = val >> 16;
- ptr[3] = val >> 24;
- break;
- }
- case Type::DoubleTyID: {
- uint64_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
- getZExtValue();
- if (TD->isBigEndian())
- val = ByteSwap_64(val);
- ptr[0] = val;
- ptr[1] = val >> 8;
- ptr[2] = val >> 16;
- ptr[3] = val >> 24;
- ptr[4] = val >> 32;
- ptr[5] = val >> 40;
- ptr[6] = val >> 48;
- ptr[7] = val >> 56;
- break;
- }
- case Type::PointerTyID:
- if (isa<ConstantPointerNull>(PC))
- memset(ptr, 0, TD->getPointerSize());
- else if (const GlobalValue* GV = dyn_cast<GlobalValue>(PC)) {
- // FIXME: what about function stubs?
- mos->addRelocation(MachineRelocation::getGV(PA-(intptr_t)Addr,
- MachineRelocation::VANILLA,
- const_cast<GlobalValue*>(GV),
- ScatteredOffset));
- ScatteredOffset = 0;
- } else
- llvm_unreachable("Unknown constant pointer type!");
- break;
- default:
- std::string msg;
- raw_string_ostream Msg(msg);
- Msg << "ERROR: Constant unimp for type: " << *PC->getType();
- llvm_report_error(Msg.str());
- }
- } else if (isa<ConstantAggregateZero>(PC)) {
- memset((void*)PA, 0, (size_t)TD->getTypeAllocSize(PC->getType()));
- } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(PC)) {
- unsigned ElementSize =
- TD->getTypeAllocSize(CPA->getType()->getElementType());
- for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
- WorkList.push_back(CPair(CPA->getOperand(i), PA+i*ElementSize));
- } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(PC)) {
- const StructLayout *SL =
- TD->getStructLayout(cast<StructType>(CPS->getType()));
- for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
- WorkList.push_back(CPair(CPS->getOperand(i),
- PA+SL->getElementOffset(i)));
- } else {
- dbgs() << "Bad Type: " << *PC->getType() << "\n";
- llvm_unreachable("Unknown constant type to initialize memory with!");
+
+ OutStreamer.EmitInstruction(OutMI);
}
}
+
+ return false;
}
-
-//===----------------------------------------------------------------------===//
-// MachOSym Implementation
-//===----------------------------------------------------------------------===//
-
-MachOSym::MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
- const MCAsmInfo *MAI) :
- GV(gv), n_strx(0), n_type(sect == NO_SECT ? N_UNDF : N_SECT), n_sect(sect),
- n_desc(0), n_value(0) {
-
- // FIXME: This is completely broken, it should use the mangler interface.
- switch (GV->getLinkage()) {
- default:
- llvm_unreachable("Unexpected linkage type!");
- break;
- case GlobalValue::WeakAnyLinkage:
- case GlobalValue::WeakODRLinkage:
- case GlobalValue::LinkOnceAnyLinkage:
- case GlobalValue::LinkOnceODRLinkage:
- case GlobalValue::CommonLinkage:
- assert(!isa<Function>(gv) && "Unexpected linkage type for Function!");
- case GlobalValue::ExternalLinkage:
- GVName = MAI->getGlobalPrefix() + name;
- n_type |= GV->hasHiddenVisibility() ? N_PEXT : N_EXT;
- break;
- case GlobalValue::PrivateLinkage:
- GVName = MAI->getPrivateGlobalPrefix() + name;
- break;
- case GlobalValue::LinkerPrivateLinkage:
- GVName = MAI->getLinkerPrivateGlobalPrefix() + name;
- break;
- case GlobalValue::InternalLinkage:
- GVName = MAI->getGlobalPrefix() + name;
- break;
- }
-}
-
-} // end namespace llvm