//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Nate Begeman and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//===----------------------------------------------------------------------===//
#include "MachOWriter.h"
+#include "MachOCodeEmitter.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
-#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetJITInfo.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/OutputBuffer.h"
#include "llvm/Support/Streams.h"
+#include "llvm/Support/raw_ostream.h"
#include <algorithm>
-using namespace llvm;
+#include <cstring>
+
+namespace llvm {
/// AddMachOWriter - Concrete function to add the Mach-O writer to the function
/// pass manager.
-MachineCodeEmitter *llvm::AddMachOWriter(FunctionPassManager &FPM,
- std::ostream &O,
+MachineCodeEmitter *AddMachOWriter(PassManagerBase &PM,
+ raw_ostream &O,
TargetMachine &TM) {
MachOWriter *MOW = new MachOWriter(O, TM);
- FPM.add(MOW);
+ PM.add(MOW);
return &MOW->getMachineCodeEmitter();
}
//===----------------------------------------------------------------------===//
-// MachOCodeEmitter Implementation
+// MachOWriter Implementation
//===----------------------------------------------------------------------===//
-namespace llvm {
- /// MachOCodeEmitter - This class is used by the MachOWriter to emit the code
- /// for functions to the Mach-O file.
- class MachOCodeEmitter : public MachineCodeEmitter {
- MachOWriter &MOW;
-
- /// Target machine description.
- TargetMachine &TM;
-
- /// is64Bit/isLittleEndian - This information is inferred from the target
- /// machine directly, indicating what header values and flags to set.
- bool is64Bit, isLittleEndian;
-
- /// Relocations - These are the relocations that the function needs, as
- /// emitted.
- std::vector<MachineRelocation> Relocations;
-
- /// CPLocations - This is a map of constant pool indices to offsets from the
- /// start of the section for that constant pool index.
- std::vector<intptr_t> CPLocations;
-
- /// CPSections - This is a map of constant pool indices to the MachOSection
- /// containing the constant pool entry for that index.
- std::vector<unsigned> CPSections;
-
- /// JTLocations - This is a map of jump table indices to offsets from the
- /// start of the section for that jump table index.
- std::vector<intptr_t> JTLocations;
-
- /// MBBLocations - This vector is a mapping from MBB ID's to their address.
- /// It is filled in by the StartMachineBasicBlock callback and queried by
- /// the getMachineBasicBlockAddress callback.
- std::vector<intptr_t> MBBLocations;
-
- public:
- MachOCodeEmitter(MachOWriter &mow) : MOW(mow), TM(MOW.TM) {
- is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
- isLittleEndian = TM.getTargetData()->isLittleEndian();
- }
+char MachOWriter::ID = 0;
- virtual void startFunction(MachineFunction &MF);
- virtual bool finishFunction(MachineFunction &MF);
+MachOWriter::MachOWriter(raw_ostream &o, TargetMachine &tm)
+ : MachineFunctionPass(&ID), O(o), TM(tm) {
+ is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
+ isLittleEndian = TM.getTargetData()->isLittleEndian();
- virtual void addRelocation(const MachineRelocation &MR) {
- Relocations.push_back(MR);
- }
-
- void emitConstantPool(MachineConstantPool *MCP);
- void emitJumpTables(MachineJumpTableInfo *MJTI);
-
- virtual intptr_t getConstantPoolEntryAddress(unsigned Index) const {
- assert(CPLocations.size() > Index && "CP not emitted!");
- return CPLocations[Index];
- }
- virtual intptr_t getJumpTableEntryAddress(unsigned Index) const {
- assert(JTLocations.size() > Index && "JT not emitted!");
- return JTLocations[Index];
- }
+ TAI = TM.getTargetAsmInfo();
- virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {
- if (MBBLocations.size() <= (unsigned)MBB->getNumber())
- MBBLocations.resize((MBB->getNumber()+1)*2);
- MBBLocations[MBB->getNumber()] = getCurrentPCOffset();
- }
+ // Create the machine code emitter object for this target.
- virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
- assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
- MBBLocations[MBB->getNumber()] && "MBB not emitted!");
- return MBBLocations[MBB->getNumber()];
- }
+ MCE = new MachOCodeEmitter(*this);
+}
- /// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
- virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) {
- assert(0 && "JIT specific function called!");
- abort();
- }
- virtual void *finishFunctionStub(const Function *F) {
- assert(0 && "JIT specific function called!");
- abort();
- return 0;
- }
- };
+MachOWriter::~MachOWriter() {
+ delete MCE;
}
-/// startFunction - This callback is invoked when a new machine function is
-/// about to be emitted.
-void MachOCodeEmitter::startFunction(MachineFunction &MF) {
- const TargetData *TD = TM.getTargetData();
- const Function *F = MF.getFunction();
-
- // Align the output buffer to the appropriate alignment, power of 2.
- unsigned FnAlign = F->getAlignment();
- unsigned TDAlign = TD->getPrefTypeAlignment(F->getType());
- unsigned Align = Log2_32(std::max(FnAlign, TDAlign));
- assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
-
- // Get the Mach-O Section that this function belongs in.
- MachOWriter::MachOSection *MOS = MOW.getTextSection();
-
- // FIXME: better memory management
- MOS->SectionData.reserve(4096);
- BufferBegin = &MOS->SectionData[0];
- BufferEnd = BufferBegin + MOS->SectionData.capacity();
-
- // Upgrade the section alignment if required.
- if (MOS->align < Align) MOS->align = Align;
-
- // Round the size up to the correct alignment for starting the new function.
- if ((MOS->size & ((1 << Align) - 1)) != 0) {
- MOS->size += (1 << Align);
- MOS->size &= ~((1 << Align) - 1);
- }
+bool MachOWriter::doInitialization(Module &M) {
+ // Set the magic value, now that we know the pointer size and endianness
+ Header.setMagic(isLittleEndian, is64Bit);
- // FIXME: Using MOS->size directly here instead of calculating it from the
- // output buffer size (impossible because the code emitter deals only in raw
- // bytes) forces us to manually synchronize size and write padding zero bytes
- // to the output buffer for all non-text sections. For text sections, we do
- // not synchonize the output buffer, and we just blow up if anyone tries to
- // write non-code to it. An assert should probably be added to
- // AddSymbolToSection to prevent calling it on the text section.
- CurBufferPtr = BufferBegin + MOS->size;
-
- // Clear per-function data structures.
- CPLocations.clear();
- CPSections.clear();
- JTLocations.clear();
- MBBLocations.clear();
-}
+ // 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;
-/// finishFunction - This callback is invoked after the function is completely
-/// finished.
-bool MachOCodeEmitter::finishFunction(MachineFunction &MF) {
- // Get the Mach-O Section that this function belongs in.
- MachOWriter::MachOSection *MOS = MOW.getTextSection();
-
- // Get a symbol for the function to add to the symbol table
- // FIXME: it seems like we should call something like AddSymbolToSection
- // in startFunction rather than changing the section size and symbol n_value
- // here.
- const GlobalValue *FuncV = MF.getFunction();
- MachOSym FnSym(FuncV, MOW.Mang->getValueName(FuncV), MOS->Index, TM);
- FnSym.n_value = MOS->size;
- MOS->size = CurBufferPtr - BufferBegin;
-
- // Emit constant pool to appropriate section(s)
- emitConstantPool(MF.getConstantPool());
-
- // Emit jump tables to appropriate section
- emitJumpTables(MF.getJumpTableInfo());
-
- // 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.isBasicBlock()) {
- Addr = getMachineBasicBlockAddress(MR.getBasicBlock());
- MR.setConstantVal(MOS->Index);
- MR.setResultPointer((void*)Addr);
- } else if (MR.isJumpTableIndex()) {
- Addr = getJumpTableEntryAddress(MR.getJumpTableIndex());
- MR.setConstantVal(MOW.getJumpTableSection()->Index);
- MR.setResultPointer((void*)Addr);
- } else if (MR.isConstantPoolIndex()) {
- Addr = getConstantPoolEntryAddress(MR.getConstantPoolIndex());
- MR.setConstantVal(CPSections[MR.getConstantPoolIndex()]);
- MR.setResultPointer((void*)Addr);
- } else if (!MR.isGlobalValue()) {
- assert(0 && "Unhandled relocation type");
- }
- MOS->Relocations.push_back(MR);
- }
- Relocations.clear();
-
- // Finally, add it to the symtab.
- MOW.SymbolTable.push_back(FnSym);
+ Mang = new Mangler(M);
return false;
}
-/// emitConstantPool - For each constant pool entry, figure out which section
-/// the constant should live in, allocate space for it, and emit it to the
-/// Section data buffer.
-void MachOCodeEmitter::emitConstantPool(MachineConstantPool *MCP) {
- const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
- if (CP.empty()) return;
-
- // FIXME: handle PIC codegen
- bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
- assert(!isPIC && "PIC codegen not yet handled for mach-o jump tables!");
-
- // Although there is no strict necessity that I am aware of, we will do what
- // gcc for OS X does and put each constant pool entry in a section of constant
- // objects of a certain size. That means that float constants go in the
- // literal4 section, and double objects go in literal8, etc.
- //
- // FIXME: revisit this decision if we ever do the "stick everything into one
- // "giant object for PIC" optimization.
- for (unsigned i = 0, e = CP.size(); i != e; ++i) {
- const Type *Ty = CP[i].getType();
- unsigned Size = TM.getTargetData()->getTypeSize(Ty);
-
- MachOWriter::MachOSection *Sec = MOW.getConstSection(CP[i].Val.ConstVal);
- OutputBuffer SecDataOut(Sec->SectionData, is64Bit, isLittleEndian);
-
- CPLocations.push_back(Sec->SectionData.size());
- CPSections.push_back(Sec->Index);
-
- // FIXME: remove when we have unified size + output buffer
- Sec->size += Size;
-
- // Allocate space in the section for the global.
- // FIXME: need alignment?
- // FIXME: share between here and AddSymbolToSection?
- for (unsigned j = 0; j < Size; ++j)
- SecDataOut.outbyte(0);
-
- MOW.InitMem(CP[i].Val.ConstVal, &Sec->SectionData[0], CPLocations[i],
- TM.getTargetData(), Sec->Relocations);
- }
+bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
+ return false;
}
-/// emitJumpTables - Emit all the jump tables for a given jump table info
-/// record to the appropriate section.
-void MachOCodeEmitter::emitJumpTables(MachineJumpTableInfo *MJTI) {
- const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
- if (JT.empty()) return;
-
- // FIXME: handle PIC codegen
- bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
- assert(!isPIC && "PIC codegen not yet handled for mach-o jump tables!");
+/// 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.
- MachOWriter::MachOSection *Sec = MOW.getJumpTableSection();
- unsigned TextSecIndex = MOW.getTextSection()->Index;
- OutputBuffer SecDataOut(Sec->SectionData, is64Bit, isLittleEndian);
+ // 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);
- for (unsigned i = 0, e = JT.size(); i != e; ++i) {
- // For each jump table, record its offset from the start of the section,
- // reserve space for the relocations to the MBBs, and add the relocations.
- const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
- JTLocations.push_back(Sec->SectionData.size());
- for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi) {
- MachineRelocation MR(MOW.GetJTRelocation(Sec->SectionData.size(),
- MBBs[mi]));
- MR.setResultPointer((void *)JTLocations[i]);
- MR.setConstantVal(TextSecIndex);
- Sec->Relocations.push_back(MR);
- SecDataOut.outaddr(0);
- }
- }
- // FIXME: remove when we have unified size + output buffer
- Sec->size = Sec->SectionData.size();
-}
+ // Emit the header and load commands.
+ EmitHeaderAndLoadCommands();
-//===----------------------------------------------------------------------===//
-// MachOWriter Implementation
-//===----------------------------------------------------------------------===//
+ // Emit the various sections and their relocation info.
+ EmitSections();
+ EmitRelocations();
-MachOWriter::MachOWriter(std::ostream &o, TargetMachine &tm) : O(o), TM(tm) {
- is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
- isLittleEndian = TM.getTargetData()->isLittleEndian();
+ // 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());
- // Create the machine code emitter object for this target.
- MCE = new MachOCodeEmitter(*this);
-}
+ // We are done with the abstract symbols.
+ SectionList.clear();
+ SymbolTable.clear();
+ DynamicSymbolTable.clear();
-MachOWriter::~MachOWriter() {
- delete MCE;
+ // Release the name mangler object.
+ delete Mang; Mang = 0;
+ return false;
}
void MachOWriter::AddSymbolToSection(MachOSection *Sec, GlobalVariable *GV) {
const Type *Ty = GV->getType()->getElementType();
- unsigned Size = TM.getTargetData()->getTypeSize(Ty);
- unsigned Align = GV->getAlignment();
- if (Align == 0)
- Align = TM.getTargetData()->getPrefTypeAlignment(Ty);
-
- MachOSym Sym(GV, Mang->getValueName(GV), Sec->Index, TM);
-
+ 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.
Align = Log2_32(Align);
Sec->align = std::max(unsigned(Sec->align), Align);
Sec->size = (Sec->size + Align - 1) & ~(Align-1);
-
+
// Add alignment padding to buffer as well.
// FIXME: remove when we have unified size + output buffer
unsigned AlignedSize = Sec->size - OrigSize;
for (unsigned i = 0; i < AlignedSize; ++i)
SecDataOut.outbyte(0);
}
+ // Globals without external linkage apparently do not go in the symbol table.
+ if (!GV->hasLocalLinkage()) {
+ MachOSym Sym(GV, Mang->getValueName(GV), Sec->Index, TAI);
+ 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
- Sym.n_value = Sec->size;
Sec->size += Size;
- SymbolTable.push_back(Sym);
- // Now that we know what section the GlovalVariable is going to be emitted
+ // 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->SectionData.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()->getTypeSize(Ty);
+ 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()) {
- MachOSym ExtOrCommonSym(GV, Mang->getValueName(GV), MachOSym::NO_SECT,TM);
+ if (NoInit || GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
+ GV->hasCommonLinkage()) {
+ MachOSym ExtOrCommonSym(GV, Mang->getValueName(GV),
+ MachOSym::NO_SECT, TAI);
// For undefined (N_UNDF) external (N_EXT) types, n_value is the size in
// bytes of the symbol.
ExtOrCommonSym.n_value = Size;
- // If the symbol is external, we'll put it on a list of symbols whose
- // addition to the symbol table is being pended until we find a reference
- if (NoInit)
- PendingSyms.push_back(ExtOrCommonSym);
- else
- SymbolTable.push_back(ExtOrCommonSym);
+ SymbolTable.push_back(ExtOrCommonSym);
+ // Remember that we've seen this symbol
+ GVOffset[GV] = Size;
return;
}
// Otherwise, this symbol is part of the .bss section.
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()) :
+ MachOSection *Sec = GV->isConstant() ? getConstSection(GV->getInitializer()) :
getDataSection();
AddSymbolToSection(Sec, GV);
InitMem(GV->getInitializer(), &Sec->SectionData[0], GVOffset[GV],
}
-bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
- // Nothing to do here, this is all done through the MCE object.
- return false;
-}
-
-bool MachOWriter::doInitialization(Module &M) {
- // Set the magic value, now that we know the pointer size and endianness
- Header.setMagic(isLittleEndian, is64Bit);
-
- // 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;
-}
-
-/// 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();
-
- // 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;
- return false;
-}
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.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.
DataBuffer &FH = Header.HeaderData;
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.vmsize = SEG.filesize;
SEG.fileoff = Header.cmdSize(is64Bit) + Header.sizeofcmds;
-
+
FHOut.outword(SEG.cmd);
FHOut.outword(SEG.cmdsize);
FHOut.outstring(SEG.segname, 16);
FHOut.outword(SEG.initprot);
FHOut.outword(SEG.nsects);
FHOut.outword(SEG.flags);
-
- // Step #5: Finish filling in the fields of the MachOSections
+
+ // 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) {
// FIXME: do we need to do something with alignment here?
currentAddr += MOS->size;
}
-
- // Step #6: Calculate the number of relocations for each section and write out
+
+ // 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(),
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);
if (is64Bit)
FHOut.outword(MOS->reserved3);
}
-
- // Step #7: Emit the symbol table to temporary buffers, so that we know the
- // size of the string table when we write the next load command.
- BufferSymbolAndStringTable();
-
+
// Step #8: Emit LC_SYMTAB/LC_DYSYMTAB load commands
SymTab.symoff = currentAddr;
SymTab.nsyms = SymbolTable.size();
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
O.write((char*)&(*I)->SectionData[0], (*I)->size);
+}
+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.
O.write((char*)&(*I)->RelocBuffer[0], (*I)->RelocBuffer.size());
}
-/// PartitionByLocal - Simple boolean predicate that returns true if Sym is
-/// a local symbol rather than an external symbol.
-bool MachOWriter::PartitionByLocal(const MachOSym &Sym) {
- return (Sym.n_type & (MachOSym::N_EXT | MachOSym::N_PEXT)) == 0;
-}
-
-/// PartitionByDefined - Simple boolean predicate that returns true if Sym is
-/// defined in this module.
-bool MachOWriter::PartitionByDefined(const MachOSym &Sym) {
- // FIXME: Do N_ABS or N_INDR count as defined?
- return (Sym.n_type & MachOSym::N_SECT) == MachOSym::N_SECT;
-}
-
/// 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->getValueName(*I), MachOSym::NO_SECT, TAI);
+ 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(), MachOSymCmp());
- // Parition the symbol table entries so that all local symbols come before
+ 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(), PartitionByLocal);
-
+
+ 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 (!PartitionByLocal(*I)) {
- std::partition(I, E, PartitionByDefined);
+ if (!MachOSym::PartitionByLocal(*I)) {
+ std::partition(I, E, MachOSym::PartitionByDefined);
break;
}
}
- // Calculate the starting index for each of the local, extern defined, and
+ // 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 (PartitionByLocal(*I)) {
+ if (MachOSym::PartitionByLocal(*I)) {
++DySymTab.nlocalsym;
++DySymTab.iextdefsym;
++DySymTab.iundefsym;
- } else if (PartitionByDefined(*I)) {
+ } 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);
// 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 == "") {
OutputBuffer SymTOut(SymT, is64Bit, isLittleEndian);
+ unsigned index = 0;
for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
- E = SymbolTable.end(); I != E; ++I) {
+ 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);
/// 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) {
for (unsigned i = 0, e = MOS.Relocations.size(); i != e; ++i) {
MachineRelocation &MR = MOS.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];
- Scattered = TargetSection != 0;
-
+
+ // If we have never seen the global before, it must be to a symbol
+ // defined in another module (N_UNDF).
+
if (!MOSPtr) {
- cerr << "Trying to relocate unknown global " << *GV << '\n';
- continue;
- //abort();
+ // FIXME: need to append stub suffix
+ Extern = true;
+ TargetAddr = 0;
+ TargetIndex = GVOffset[GV];
+ } else {
+ Scattered = TargetSection != 0;
+ TargetSection = MOSPtr->Index;
}
-
- 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.SectionData, is64Bit, isLittleEndian);
- MachOSection &To = *SectionList[TargetSection - 1];
- MOS.nreloc += GetTargetRelocation(MR, MOS.Index, To.addr, To.Index,
- RelocOut, SecOut, Scattered);
+ 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, void *Addr, intptr_t Offset,
- const TargetData *TD,
+ const TargetData *TD,
std::vector<MachineRelocation> &MRs) {
typedef std::pair<const Constant*, intptr_t> CPair;
std::vector<CPair> WorkList;
-
+
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->getTypeSize(CP->getType()->getElementType());
+ 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)) {
abort();
break;
}
- } else if (PC->getType()->isFirstClassType()) {
+ } else if (PC->getType()->isSingleValueType()) {
unsigned char *ptr = (unsigned char *)PA;
switch (PC->getType()->getTypeID()) {
case Type::IntegerTyID: {
break;
}
case Type::FloatTyID: {
- uint64_t val = FloatToBits(cast<ConstantFP>(PC)->getValue());
+ uint32_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
+ getZExtValue();
if (TD->isBigEndian())
val = ByteSwap_32(val);
ptr[0] = val;
break;
}
case Type::DoubleTyID: {
- uint64_t val = DoubleToBits(cast<ConstantFP>(PC)->getValue());
+ uint64_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
+ getZExtValue();
if (TD->isBigEndian())
val = ByteSwap_64(val);
ptr[0] = val;
abort();
}
} else if (isa<ConstantAggregateZero>(PC)) {
- memset((void*)PA, 0, (size_t)TD->getTypeSize(PC->getType()));
+ memset((void*)PA, 0, (size_t)TD->getTypeAllocSize(PC->getType()));
} else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(PC)) {
- unsigned ElementSize = TD->getTypeSize(CPA->getType()->getElementType());
+ 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)) {
}
}
+//===----------------------------------------------------------------------===//
+// MachOSym Implementation
+//===----------------------------------------------------------------------===//
+
MachOSym::MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
- TargetMachine &TM) :
+ const TargetAsmInfo *TAI) :
GV(gv), n_strx(0), n_type(sect == NO_SECT ? N_UNDF : N_SECT), n_sect(sect),
n_desc(0), n_value(0) {
- const TargetAsmInfo *TAI = TM.getTargetAsmInfo();
-
switch (GV->getLinkage()) {
default:
assert(0 && "Unexpected linkage type!");
break;
- case GlobalValue::WeakLinkage:
- case GlobalValue::LinkOnceLinkage:
+ 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 = TAI->getGlobalPrefix() + name;
n_type |= GV->hasHiddenVisibility() ? N_PEXT : N_EXT;
break;
+ case GlobalValue::PrivateLinkage:
+ GVName = TAI->getPrivateGlobalPrefix() + name;
+ break;
case GlobalValue::InternalLinkage:
GVName = TAI->getGlobalPrefix() + name;
break;
}
}
+
+} // end namespace llvm
+
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