mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34031 91177308-0d34-0410-b5e6-96231b3b80d8
912 lines
34 KiB
C++
912 lines
34 KiB
C++
//===-- MachOWriter.cpp - Target-independent Mach-O Writer code -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Nate Begeman and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the target-independent Mach-O writer. This file writes
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// out the Mach-O file in the following order:
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//
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// #1 FatHeader (universal-only)
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// #2 FatArch (universal-only, 1 per universal arch)
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// Per arch:
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// #3 Header
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// #4 Load Commands
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// #5 Sections
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// #6 Relocations
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// #7 Symbols
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// #8 Strings
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//
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//===----------------------------------------------------------------------===//
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#include "MachOWriter.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/CodeGen/FileWriters.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetJITInfo.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/OutputBuffer.h"
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#include "llvm/Support/Streams.h"
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#include <algorithm>
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using namespace llvm;
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/// AddMachOWriter - Concrete function to add the Mach-O writer to the function
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/// pass manager.
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MachineCodeEmitter *llvm::AddMachOWriter(FunctionPassManager &FPM,
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std::ostream &O,
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TargetMachine &TM) {
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MachOWriter *MOW = new MachOWriter(O, TM);
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FPM.add(MOW);
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return &MOW->getMachineCodeEmitter();
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}
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//===----------------------------------------------------------------------===//
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// MachOCodeEmitter Implementation
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//===----------------------------------------------------------------------===//
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namespace llvm {
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/// MachOCodeEmitter - This class is used by the MachOWriter to emit the code
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/// for functions to the Mach-O file.
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class MachOCodeEmitter : public MachineCodeEmitter {
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MachOWriter &MOW;
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/// Target machine description.
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TargetMachine &TM;
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/// is64Bit/isLittleEndian - This information is inferred from the target
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/// machine directly, indicating what header values and flags to set.
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bool is64Bit, isLittleEndian;
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/// Relocations - These are the relocations that the function needs, as
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/// emitted.
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std::vector<MachineRelocation> Relocations;
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/// CPLocations - This is a map of constant pool indices to offsets from the
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/// start of the section for that constant pool index.
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std::vector<intptr_t> CPLocations;
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/// CPSections - This is a map of constant pool indices to the MachOSection
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/// containing the constant pool entry for that index.
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std::vector<unsigned> CPSections;
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/// JTLocations - This is a map of jump table indices to offsets from the
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/// start of the section for that jump table index.
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std::vector<intptr_t> JTLocations;
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/// MBBLocations - This vector is a mapping from MBB ID's to their address.
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/// It is filled in by the StartMachineBasicBlock callback and queried by
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/// the getMachineBasicBlockAddress callback.
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std::vector<intptr_t> MBBLocations;
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public:
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MachOCodeEmitter(MachOWriter &mow) : MOW(mow), TM(MOW.TM) {
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is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
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isLittleEndian = TM.getTargetData()->isLittleEndian();
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}
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virtual void startFunction(MachineFunction &MF);
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virtual bool finishFunction(MachineFunction &MF);
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virtual void addRelocation(const MachineRelocation &MR) {
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Relocations.push_back(MR);
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}
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void emitConstantPool(MachineConstantPool *MCP);
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void emitJumpTables(MachineJumpTableInfo *MJTI);
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virtual intptr_t getConstantPoolEntryAddress(unsigned Index) const {
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assert(CPLocations.size() > Index && "CP not emitted!");
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return CPLocations[Index];
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}
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virtual intptr_t getJumpTableEntryAddress(unsigned Index) const {
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assert(JTLocations.size() > Index && "JT not emitted!");
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return JTLocations[Index];
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}
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virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {
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if (MBBLocations.size() <= (unsigned)MBB->getNumber())
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MBBLocations.resize((MBB->getNumber()+1)*2);
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MBBLocations[MBB->getNumber()] = getCurrentPCOffset();
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}
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virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
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assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
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MBBLocations[MBB->getNumber()] && "MBB not emitted!");
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return MBBLocations[MBB->getNumber()];
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}
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/// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
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virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) {
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assert(0 && "JIT specific function called!");
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abort();
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}
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virtual void *finishFunctionStub(const Function *F) {
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assert(0 && "JIT specific function called!");
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abort();
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return 0;
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}
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};
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}
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/// startFunction - This callback is invoked when a new machine function is
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/// about to be emitted.
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void MachOCodeEmitter::startFunction(MachineFunction &MF) {
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const TargetData *TD = TM.getTargetData();
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const Function *F = MF.getFunction();
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// Align the output buffer to the appropriate alignment, power of 2.
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unsigned FnAlign = F->getAlignment();
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unsigned TDAlign = TD->getTypeAlignmentPref(F->getType());
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unsigned Align = Log2_32(std::max(FnAlign, TDAlign));
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assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
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// Get the Mach-O Section that this function belongs in.
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MachOWriter::MachOSection *MOS = MOW.getTextSection();
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// FIXME: better memory management
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MOS->SectionData.reserve(4096);
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BufferBegin = &MOS->SectionData[0];
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BufferEnd = BufferBegin + MOS->SectionData.capacity();
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// Upgrade the section alignment if required.
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if (MOS->align < Align) MOS->align = Align;
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// Round the size up to the correct alignment for starting the new function.
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if ((MOS->size & ((1 << Align) - 1)) != 0) {
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MOS->size += (1 << Align);
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MOS->size &= ~((1 << Align) - 1);
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}
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// FIXME: Using MOS->size directly here instead of calculating it from the
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// output buffer size (impossible because the code emitter deals only in raw
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// bytes) forces us to manually synchronize size and write padding zero bytes
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// to the output buffer for all non-text sections. For text sections, we do
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// not synchonize the output buffer, and we just blow up if anyone tries to
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// write non-code to it. An assert should probably be added to
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// AddSymbolToSection to prevent calling it on the text section.
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CurBufferPtr = BufferBegin + MOS->size;
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// Clear per-function data structures.
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CPLocations.clear();
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CPSections.clear();
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JTLocations.clear();
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MBBLocations.clear();
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}
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/// finishFunction - This callback is invoked after the function is completely
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/// finished.
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bool MachOCodeEmitter::finishFunction(MachineFunction &MF) {
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// Get the Mach-O Section that this function belongs in.
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MachOWriter::MachOSection *MOS = MOW.getTextSection();
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// Get a symbol for the function to add to the symbol table
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// FIXME: it seems like we should call something like AddSymbolToSection
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// in startFunction rather than changing the section size and symbol n_value
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// here.
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const GlobalValue *FuncV = MF.getFunction();
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MachOSym FnSym(FuncV, MOW.Mang->getValueName(FuncV), MOS->Index, TM);
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FnSym.n_value = MOS->size;
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MOS->size = CurBufferPtr - BufferBegin;
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// Emit constant pool to appropriate section(s)
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emitConstantPool(MF.getConstantPool());
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// Emit jump tables to appropriate section
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emitJumpTables(MF.getJumpTableInfo());
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// If we have emitted any relocations to function-specific objects such as
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// basic blocks, constant pools entries, or jump tables, record their
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// addresses now so that we can rewrite them with the correct addresses
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// later.
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for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
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MachineRelocation &MR = Relocations[i];
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intptr_t Addr;
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if (MR.isBasicBlock()) {
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Addr = getMachineBasicBlockAddress(MR.getBasicBlock());
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MR.setConstantVal(MOS->Index);
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MR.setResultPointer((void*)Addr);
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} else if (MR.isJumpTableIndex()) {
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Addr = getJumpTableEntryAddress(MR.getJumpTableIndex());
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MR.setConstantVal(MOW.getJumpTableSection()->Index);
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MR.setResultPointer((void*)Addr);
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} else if (MR.isConstantPoolIndex()) {
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Addr = getConstantPoolEntryAddress(MR.getConstantPoolIndex());
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MR.setConstantVal(CPSections[MR.getConstantPoolIndex()]);
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MR.setResultPointer((void*)Addr);
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} else if (!MR.isGlobalValue()) {
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assert(0 && "Unhandled relocation type");
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}
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MOS->Relocations.push_back(MR);
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}
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Relocations.clear();
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// Finally, add it to the symtab.
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MOW.SymbolTable.push_back(FnSym);
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return false;
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}
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/// emitConstantPool - For each constant pool entry, figure out which section
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/// the constant should live in, allocate space for it, and emit it to the
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/// Section data buffer.
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void MachOCodeEmitter::emitConstantPool(MachineConstantPool *MCP) {
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const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
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if (CP.empty()) return;
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// FIXME: handle PIC codegen
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bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
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assert(!isPIC && "PIC codegen not yet handled for mach-o jump tables!");
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// Although there is no strict necessity that I am aware of, we will do what
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// gcc for OS X does and put each constant pool entry in a section of constant
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// objects of a certain size. That means that float constants go in the
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// literal4 section, and double objects go in literal8, etc.
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//
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// FIXME: revisit this decision if we ever do the "stick everything into one
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// "giant object for PIC" optimization.
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for (unsigned i = 0, e = CP.size(); i != e; ++i) {
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const Type *Ty = CP[i].getType();
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unsigned Size = TM.getTargetData()->getTypeSize(Ty);
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MachOWriter::MachOSection *Sec = MOW.getConstSection(CP[i].Val.ConstVal);
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OutputBuffer SecDataOut(Sec->SectionData, is64Bit, isLittleEndian);
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CPLocations.push_back(Sec->SectionData.size());
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CPSections.push_back(Sec->Index);
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// FIXME: remove when we have unified size + output buffer
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Sec->size += Size;
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// Allocate space in the section for the global.
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// FIXME: need alignment?
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// FIXME: share between here and AddSymbolToSection?
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for (unsigned j = 0; j < Size; ++j)
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SecDataOut.outbyte(0);
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MOW.InitMem(CP[i].Val.ConstVal, &Sec->SectionData[0], CPLocations[i],
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TM.getTargetData(), Sec->Relocations);
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}
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}
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/// emitJumpTables - Emit all the jump tables for a given jump table info
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/// record to the appropriate section.
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void MachOCodeEmitter::emitJumpTables(MachineJumpTableInfo *MJTI) {
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const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
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if (JT.empty()) return;
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// FIXME: handle PIC codegen
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bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
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assert(!isPIC && "PIC codegen not yet handled for mach-o jump tables!");
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MachOWriter::MachOSection *Sec = MOW.getJumpTableSection();
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unsigned TextSecIndex = MOW.getTextSection()->Index;
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OutputBuffer SecDataOut(Sec->SectionData, is64Bit, isLittleEndian);
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for (unsigned i = 0, e = JT.size(); i != e; ++i) {
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// For each jump table, record its offset from the start of the section,
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// reserve space for the relocations to the MBBs, and add the relocations.
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const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
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JTLocations.push_back(Sec->SectionData.size());
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for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi) {
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MachineRelocation MR(MOW.GetJTRelocation(Sec->SectionData.size(),
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MBBs[mi]));
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MR.setResultPointer((void *)JTLocations[i]);
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MR.setConstantVal(TextSecIndex);
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Sec->Relocations.push_back(MR);
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SecDataOut.outaddr(0);
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}
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}
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// FIXME: remove when we have unified size + output buffer
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Sec->size = Sec->SectionData.size();
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}
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//===----------------------------------------------------------------------===//
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// MachOWriter Implementation
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//===----------------------------------------------------------------------===//
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MachOWriter::MachOWriter(std::ostream &o, TargetMachine &tm) : O(o), TM(tm) {
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is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
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isLittleEndian = TM.getTargetData()->isLittleEndian();
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// Create the machine code emitter object for this target.
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MCE = new MachOCodeEmitter(*this);
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}
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MachOWriter::~MachOWriter() {
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delete MCE;
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}
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void MachOWriter::AddSymbolToSection(MachOSection *Sec, GlobalVariable *GV) {
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const Type *Ty = GV->getType()->getElementType();
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unsigned Size = TM.getTargetData()->getTypeSize(Ty);
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unsigned Align = GV->getAlignment();
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if (Align == 0)
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Align = TM.getTargetData()->getTypeAlignmentPref(Ty);
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MachOSym Sym(GV, Mang->getValueName(GV), Sec->Index, TM);
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// Reserve space in the .bss section for this symbol while maintaining the
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// desired section alignment, which must be at least as much as required by
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// this symbol.
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OutputBuffer SecDataOut(Sec->SectionData, is64Bit, isLittleEndian);
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if (Align) {
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uint64_t OrigSize = Sec->size;
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Align = Log2_32(Align);
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Sec->align = std::max(unsigned(Sec->align), Align);
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Sec->size = (Sec->size + Align - 1) & ~(Align-1);
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// Add alignment padding to buffer as well.
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// FIXME: remove when we have unified size + output buffer
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unsigned AlignedSize = Sec->size - OrigSize;
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for (unsigned i = 0; i < AlignedSize; ++i)
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SecDataOut.outbyte(0);
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}
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// Record the offset of the symbol, and then allocate space for it.
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// FIXME: remove when we have unified size + output buffer
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Sym.n_value = Sec->size;
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Sec->size += Size;
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SymbolTable.push_back(Sym);
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// Now that we know what section the GlovalVariable is going to be emitted
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// into, update our mappings.
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// FIXME: We may also need to update this when outputting non-GlobalVariable
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// GlobalValues such as functions.
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GVSection[GV] = Sec;
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GVOffset[GV] = Sec->SectionData.size();
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// Allocate space in the section for the global.
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for (unsigned i = 0; i < Size; ++i)
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SecDataOut.outbyte(0);
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}
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void MachOWriter::EmitGlobal(GlobalVariable *GV) {
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const Type *Ty = GV->getType()->getElementType();
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unsigned Size = TM.getTargetData()->getTypeSize(Ty);
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bool NoInit = !GV->hasInitializer();
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// If this global has a zero initializer, it is part of the .bss or common
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// section.
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if (NoInit || GV->getInitializer()->isNullValue()) {
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// If this global is part of the common block, add it now. Variables are
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// part of the common block if they are zero initialized and allowed to be
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// merged with other symbols.
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if (NoInit || GV->hasLinkOnceLinkage() || GV->hasWeakLinkage()) {
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MachOSym ExtOrCommonSym(GV, Mang->getValueName(GV), MachOSym::NO_SECT,TM);
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// For undefined (N_UNDF) external (N_EXT) types, n_value is the size in
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// bytes of the symbol.
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ExtOrCommonSym.n_value = Size;
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// If the symbol is external, we'll put it on a list of symbols whose
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// addition to the symbol table is being pended until we find a reference
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if (NoInit)
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PendingSyms.push_back(ExtOrCommonSym);
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else
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SymbolTable.push_back(ExtOrCommonSym);
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return;
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}
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// Otherwise, this symbol is part of the .bss section.
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MachOSection *BSS = getBSSSection();
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AddSymbolToSection(BSS, GV);
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return;
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}
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// Scalar read-only data goes in a literal section if the scalar is 4, 8, or
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// 16 bytes, or a cstring. Other read only data goes into a regular const
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// section. Read-write data goes in the data section.
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MachOSection *Sec = GV->isConstant() ? getConstSection(GV->getInitializer()) :
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getDataSection();
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AddSymbolToSection(Sec, GV);
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InitMem(GV->getInitializer(), &Sec->SectionData[0], GVOffset[GV],
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TM.getTargetData(), Sec->Relocations);
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}
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bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
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// Nothing to do here, this is all done through the MCE object.
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return false;
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}
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bool MachOWriter::doInitialization(Module &M) {
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// Set the magic value, now that we know the pointer size and endianness
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Header.setMagic(isLittleEndian, is64Bit);
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// Set the file type
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// FIXME: this only works for object files, we do not support the creation
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// of dynamic libraries or executables at this time.
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Header.filetype = MachOHeader::MH_OBJECT;
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Mang = new Mangler(M);
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return false;
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}
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/// doFinalization - Now that the module has been completely processed, emit
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/// the Mach-O file to 'O'.
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bool MachOWriter::doFinalization(Module &M) {
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// FIXME: we don't handle debug info yet, we should probably do that.
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// Okay, the.text section has been completed, build the .data, .bss, and
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// "common" sections next.
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I)
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EmitGlobal(I);
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// Emit the header and load commands.
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EmitHeaderAndLoadCommands();
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// Emit the various sections and their relocation info.
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EmitSections();
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// Write the symbol table and the string table to the end of the file.
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O.write((char*)&SymT[0], SymT.size());
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O.write((char*)&StrT[0], StrT.size());
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// We are done with the abstract symbols.
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SectionList.clear();
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SymbolTable.clear();
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DynamicSymbolTable.clear();
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// Release the name mangler object.
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delete Mang; Mang = 0;
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return false;
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}
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void MachOWriter::EmitHeaderAndLoadCommands() {
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// 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.
|
|
DataBuffer &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: 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 #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();
|
|
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
|
|
O.write((char*)&(*I)->SectionData[0], (*I)->size);
|
|
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)
|
|
|
|
// 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
|
|
// all symbols with external linkage. { 1 | 2 3 }
|
|
std::partition(SymbolTable.begin(), SymbolTable.end(), 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);
|
|
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 (PartitionByLocal(*I)) {
|
|
++DySymTab.nlocalsym;
|
|
++DySymTab.iextdefsym;
|
|
++DySymTab.iundefsym;
|
|
} else if (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);
|
|
|
|
for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
|
|
E = SymbolTable.end(); I != E; ++I) {
|
|
// 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;
|
|
|
|
// 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) {
|
|
for (unsigned i = 0, e = MOS.Relocations.size(); i != e; ++i) {
|
|
MachineRelocation &MR = MOS.Relocations[i];
|
|
unsigned TargetSection = MR.getConstantVal();
|
|
|
|
// This is a scattered relocation entry if it points to a global value with
|
|
// a non-zero offset.
|
|
bool Scattered = 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 (!MOSPtr) {
|
|
cerr << "Trying to relocate unknown global " << *GV << '\n';
|
|
continue;
|
|
//abort();
|
|
}
|
|
|
|
TargetSection = MOSPtr->Index;
|
|
MR.setResultPointer((void*)Offset);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
// 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,
|
|
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 ConstantPacked *CP = dyn_cast<ConstantPacked>(PC)) {
|
|
unsigned ElementSize = TD->getTypeSize(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: {
|
|
std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
|
|
ScatteredOffset = TD->getIndexedOffset(CE->getOperand(0)->getType(),
|
|
Indexes);
|
|
WorkList.push_back(CPair(CE->getOperand(0), PA));
|
|
break;
|
|
}
|
|
case Instruction::Add:
|
|
default:
|
|
cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
|
|
abort();
|
|
break;
|
|
}
|
|
} else if (PC->getType()->isFirstClassType()) {
|
|
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 {
|
|
assert(0 && "Not implemented: bit widths > 64");
|
|
}
|
|
break;
|
|
}
|
|
case Type::FloatTyID: {
|
|
uint64_t val = FloatToBits(cast<ConstantFP>(PC)->getValue());
|
|
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 = DoubleToBits(cast<ConstantFP>(PC)->getValue());
|
|
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?
|
|
MRs.push_back(MachineRelocation::getGV(PA-(intptr_t)Addr,
|
|
MachineRelocation::VANILLA,
|
|
const_cast<GlobalValue*>(GV),
|
|
ScatteredOffset));
|
|
ScatteredOffset = 0;
|
|
} else
|
|
assert(0 && "Unknown constant pointer type!");
|
|
break;
|
|
default:
|
|
cerr << "ERROR: Constant unimp for type: " << *PC->getType() << "\n";
|
|
abort();
|
|
}
|
|
} else if (isa<ConstantAggregateZero>(PC)) {
|
|
memset((void*)PA, 0, (size_t)TD->getTypeSize(PC->getType()));
|
|
} else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(PC)) {
|
|
unsigned ElementSize = TD->getTypeSize(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->MemberOffsets[i]));
|
|
} else {
|
|
cerr << "Bad Type: " << *PC->getType() << "\n";
|
|
assert(0 && "Unknown constant type to initialize memory with!");
|
|
}
|
|
}
|
|
}
|
|
|
|
MachOSym::MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
|
|
TargetMachine &TM) :
|
|
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:
|
|
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::InternalLinkage:
|
|
GVName = TAI->getGlobalPrefix() + name;
|
|
break;
|
|
}
|
|
}
|