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Hook up llc's -filetype=obj to use MCStreamer if an MCCodeEmitter is available.

Browse Source 
Remove most of old Mach-O Writer support, it has been replaced by MCMachOStreamer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
This commit is contained in:
Nate Begeman
2010-01-15 18:51:18 +00:00
parent 309264d1e4
commit 3fe980b127
10 changed files with 142 additions and 1554 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/llvm/CodeGen/FileWriters.h
View File

@ -20,11 +20,17 @@ namespace llvm {
class ObjectCodeEmitter; class ObjectCodeEmitter;
class TargetMachine; class TargetMachine;
class raw_ostream; class raw_ostream;
class formatted_raw_ostream;
class MachineFunctionPass;
class MCAsmInfo;
class MCCodeEmitter;
ObjectCodeEmitter *AddELFWriter(PassManagerBase &FPM, raw_ostream &O, ObjectCodeEmitter *AddELFWriter(PassManagerBase &FPM, raw_ostream &O,
TargetMachine &TM); TargetMachine &TM);
ObjectCodeEmitter *AddMachOWriter(PassManagerBase &FPM, raw_ostream &O, MachineFunctionPass *createMachOWriter(formatted_raw_ostream &O,
TargetMachine &TM); TargetMachine &TM,
const MCAsmInfo *T,
MCCodeEmitter *MCE);
} // end llvm namespace } // end llvm namespace

8
include/llvm/Target/TargetMachine.h
View File

@ -452,6 +452,14 @@ public:
bool addAssemblyEmitter(PassManagerBase &, CodeGenOpt::Level, bool addAssemblyEmitter(PassManagerBase &, CodeGenOpt::Level,
bool /* VerboseAsmDefault */, bool /* VerboseAsmDefault */,
formatted_raw_ostream &); formatted_raw_ostream &);
/// addObjectFileEmitter - Helper function which creates a target specific
/// object files emitter, if available. This interface is temporary, for
/// bringing up MCAssembler-based object file emitters.
///
/// \return Returns 'false' on success.
bool addObjectFileEmitter(PassManagerBase &, CodeGenOpt::Level,
formatted_raw_ostream &);
}; };
} // End llvm namespace } // End llvm namespace

15
lib/CodeGen/LLVMTargetMachine.cpp
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@ -17,6 +17,7 @@
#include "llvm/Assembly/PrintModulePass.h" #include "llvm/Assembly/PrintModulePass.h"
#include "llvm/CodeGen/AsmPrinter.h" #include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/Passes.h" #include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/FileWriters.h"
#include "llvm/CodeGen/GCStrategy.h" #include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/MachineFunctionAnalysis.h" #include "llvm/CodeGen/MachineFunctionAnalysis.h"
#include "llvm/Target/TargetOptions.h" #include "llvm/Target/TargetOptions.h"
@ -115,12 +116,11 @@ LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
return FileModel::Error; return FileModel::Error;
return FileModel::AsmFile; return FileModel::AsmFile;
case TargetMachine::ObjectFile: case TargetMachine::ObjectFile:
if (getMachOWriterInfo()) if (!addObjectFileEmitter(PM, OptLevel, Out))
return FileModel::MachOFile; return FileModel::MachOFile;
else if (getELFWriterInfo()) else if (getELFWriterInfo())
return FileModel::ElfFile; return FileModel::ElfFile;
} }
return FileModel::Error; return FileModel::Error;
} }
@ -137,6 +137,17 @@ bool LLVMTargetMachine::addAssemblyEmitter(PassManagerBase &PM,
return false; return false;
} }
bool LLVMTargetMachine::addObjectFileEmitter(PassManagerBase &PM,
CodeGenOpt::Level OptLevel,
formatted_raw_ostream &Out) {
MCCodeEmitter *Emitter = getTarget().createCodeEmitter(*this);
if (!Emitter)
return true;
PM.add(createMachOWriter(Out, *this, getMCAsmInfo(), Emitter));
return false;
}
/// addPassesToEmitFileFinish - If the passes to emit the specified file had to /// addPassesToEmitFileFinish - If the passes to emit the specified file had to
/// be split up (e.g., to add an object writer pass), this method can be used to /// be split up (e.g., to add an object writer pass), this method can be used to
/// finish up adding passes to emit the file, if necessary. /// finish up adding passes to emit the file, if necessary.

412
lib/CodeGen/MachO.h
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@ -1,412 +0,0 @@
//=== MachO.h - Mach-O structures and constants -----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines MachO .
//
//===----------------------------------------------------------------------===//
#ifndef MACHO_H
#define MACHO_H
#include "llvm/CodeGen/BinaryObject.h"
#include <string>
#include <vector>
namespace llvm {
class GlobalValue;
class MCAsmInfo;
/// MachOSym - This struct contains information about each symbol that is
/// added to logical symbol table for the module. This is eventually
/// turned into a real symbol table in the file.
struct MachOSym {
const GlobalValue *GV; // The global value this corresponds to.
std::string GVName; // The mangled name of the global value.
uint32_t n_strx; // index into the string table
uint8_t n_type; // type flag
uint8_t n_sect; // section number or NO_SECT
int16_t n_desc; // see <mach-o/stab.h>
uint64_t n_value; // value for this symbol (or stab offset)
// Constants for the n_sect field
// see <mach-o/nlist.h>
enum { NO_SECT = 0 }; // symbol is not in any section
// Constants for the n_type field
// see <mach-o/nlist.h>
enum { N_UNDF = 0x0, // undefined, n_sect == NO_SECT
N_ABS = 0x2, // absolute, n_sect == NO_SECT
N_SECT = 0xe, // defined in section number n_sect
N_PBUD = 0xc, // prebound undefined (defined in a dylib)
N_INDR = 0xa // indirect
};
// The following bits are OR'd into the types above. For example, a type
// of 0x0f would be an external N_SECT symbol (0x0e | 0x01).
enum { N_EXT = 0x01, // external symbol bit
N_PEXT = 0x10 // private external symbol bit
};
// Constants for the n_desc field
// see <mach-o/loader.h>
enum { REFERENCE_FLAG_UNDEFINED_NON_LAZY = 0,
REFERENCE_FLAG_UNDEFINED_LAZY = 1,
REFERENCE_FLAG_DEFINED = 2,
REFERENCE_FLAG_PRIVATE_DEFINED = 3,
REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY = 4,
REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY = 5
};
enum { N_NO_DEAD_STRIP = 0x0020, // symbol is not to be dead stripped
N_WEAK_REF = 0x0040, // symbol is weak referenced
N_WEAK_DEF = 0x0080 // coalesced symbol is a weak definition
};
MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
const MCAsmInfo *MAI);
struct SymCmp {
// FIXME: this does not appear to be sorting 'f' after 'F'
bool operator()(const MachOSym &LHS, const MachOSym &RHS) {
return LHS.GVName < RHS.GVName;
}
};
/// PartitionByLocal - Simple boolean predicate that returns true if Sym is
/// a local symbol rather than an external symbol.
static inline bool 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.
static inline bool PartitionByDefined(const MachOSym &Sym) {
// FIXME: Do N_ABS or N_INDR count as defined?
return (Sym.n_type & MachOSym::N_SECT) == MachOSym::N_SECT;
}
}; // end struct MachOSym
/// MachOHeader - This struct contains the header information about a
/// specific architecture type/subtype pair that is emitted to the file.
struct MachOHeader {
uint32_t magic; // mach magic number identifier
uint32_t filetype; // type of file
uint32_t ncmds; // number of load commands
uint32_t sizeofcmds; // the size of all the load commands
uint32_t flags; // flags
uint32_t reserved; // 64-bit only
/// HeaderData - The actual data for the header which we are building
/// up for emission to the file.
std::vector<unsigned char> HeaderData;
// Constants for the filetype field
// see <mach-o/loader.h> for additional info on the various types
enum { MH_OBJECT = 1, // relocatable object file
MH_EXECUTE = 2, // demand paged executable file
MH_FVMLIB = 3, // fixed VM shared library file
MH_CORE = 4, // core file
MH_PRELOAD = 5, // preloaded executable file
MH_DYLIB = 6, // dynamically bound shared library
MH_DYLINKER = 7, // dynamic link editor
MH_BUNDLE = 8, // dynamically bound bundle file
MH_DYLIB_STUB = 9, // shared library stub for static linking only
MH_DSYM = 10 // companion file wiht only debug sections
};
// Constants for the flags field
enum { MH_NOUNDEFS = 1 << 0,
// the object file has no undefined references
MH_INCRLINK = 1 << 1,
// the object file is the output of an incremental link against
// a base file and cannot be link edited again
MH_DYLDLINK = 1 << 2,
// the object file is input for the dynamic linker and cannot be
// statically link edited again.
MH_BINDATLOAD = 1 << 3,
// the object file's undefined references are bound by the
// dynamic linker when loaded.
MH_PREBOUND = 1 << 4,
// the file has its dynamic undefined references prebound
MH_SPLIT_SEGS = 1 << 5,
// the file has its read-only and read-write segments split
// see <mach/shared_memory_server.h>
MH_LAZY_INIT = 1 << 6,
// the shared library init routine is to be run lazily via
// catching memory faults to its writable segments (obsolete)
MH_TWOLEVEL = 1 << 7,
// the image is using two-level namespace bindings
MH_FORCE_FLAT = 1 << 8,
// the executable is forcing all images to use flat namespace
// bindings.
MH_NOMULTIDEFS = 1 << 8,
// this umbrella guarantees no multiple definitions of symbols
// in its sub-images so the two-level namespace hints can
// always be used.
MH_NOFIXPREBINDING = 1 << 10,
// do not have dyld notify the prebidning agent about this
// executable.
MH_PREBINDABLE = 1 << 11,
// the binary is not prebound but can have its prebinding
// redone. only used when MH_PREBOUND is not set.
MH_ALLMODSBOUND = 1 << 12,
// indicates that this binary binds to all two-level namespace
// modules of its dependent libraries. Only used when
// MH_PREBINDABLE and MH_TWOLEVEL are both set.
MH_SUBSECTIONS_VIA_SYMBOLS = 1 << 13,
// safe to divide up the sections into sub-sections via symbols
// for dead code stripping.
MH_CANONICAL = 1 << 14,
// the binary has been canonicalized via the unprebind operation
MH_WEAK_DEFINES = 1 << 15,
// the final linked image contains external weak symbols
MH_BINDS_TO_WEAK = 1 << 16,
// the final linked image uses weak symbols
MH_ALLOW_STACK_EXECUTION = 1 << 17
// When this bit is set, all stacks in the task will be given
// stack execution privilege. Only used in MH_EXECUTE filetype
};
MachOHeader() : magic(0), filetype(0), ncmds(0), sizeofcmds(0), flags(0),
reserved(0) {}
/// cmdSize - This routine returns the size of the MachOSection as written
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
unsigned cmdSize(bool is64Bit) const {
if (is64Bit)
return 8 * sizeof(uint32_t);
else
return 7 * sizeof(uint32_t);
}
/// setMagic - This routine sets the appropriate value for the 'magic'
/// field based on pointer size and endianness.
void setMagic(bool isLittleEndian, bool is64Bit) {
if (isLittleEndian)
if (is64Bit) magic = 0xcffaedfe;
else magic = 0xcefaedfe;
else
if (is64Bit) magic = 0xfeedfacf;
else magic = 0xfeedface;
}
}; // end struct MachOHeader
/// MachOSegment - This struct contains the necessary information to
/// emit the load commands for each section in the file.
struct MachOSegment {
uint32_t cmd; // LC_SEGMENT or LC_SEGMENT_64
uint32_t cmdsize; // Total size of this struct and section commands
std::string segname; // segment name
uint64_t vmaddr; // address of this segment
uint64_t vmsize; // size of this segment, may be larger than filesize
uint64_t fileoff; // offset in file
uint64_t filesize; // amount to read from file
uint32_t maxprot; // maximum VM protection
uint32_t initprot; // initial VM protection
uint32_t nsects; // number of sections in this segment
uint32_t flags; // flags
// The following constants are getting pulled in by one of the
// system headers, which creates a neat clash with the enum.
#if !defined(VM_PROT_NONE)
#define VM_PROT_NONE 0x00
#endif
#if !defined(VM_PROT_READ)
#define VM_PROT_READ 0x01
#endif
#if !defined(VM_PROT_WRITE)
#define VM_PROT_WRITE 0x02
#endif
#if !defined(VM_PROT_EXECUTE)
#define VM_PROT_EXECUTE 0x04
#endif
#if !defined(VM_PROT_ALL)
#define VM_PROT_ALL 0x07
#endif
// Constants for the vm protection fields
// see <mach-o/vm_prot.h>
enum { SEG_VM_PROT_NONE = VM_PROT_NONE,
SEG_VM_PROT_READ = VM_PROT_READ, // read permission
SEG_VM_PROT_WRITE = VM_PROT_WRITE, // write permission
SEG_VM_PROT_EXECUTE = VM_PROT_EXECUTE,
SEG_VM_PROT_ALL = VM_PROT_ALL
};
// Constants for the cmd field
// see <mach-o/loader.h>
enum { LC_SEGMENT = 0x01, // segment of this file to be mapped
LC_SEGMENT_64 = 0x19 // 64-bit segment of this file to be mapped
};
/// cmdSize - This routine returns the size of the MachOSection as written
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
unsigned cmdSize(bool is64Bit) const {
if (is64Bit)
return 6 * sizeof(uint32_t) + 4 * sizeof(uint64_t) + 16;
else
return 10 * sizeof(uint32_t) + 16; // addresses only 32 bits
}
MachOSegment(const std::string &seg, bool is64Bit)
: cmd(is64Bit ? LC_SEGMENT_64 : LC_SEGMENT), cmdsize(0), segname(seg),
vmaddr(0), vmsize(0), fileoff(0), filesize(0), maxprot(VM_PROT_ALL),
initprot(VM_PROT_ALL), nsects(0), flags(0) { }
};
/// MachOSection - This struct contains information about each section in a
/// particular segment that is emitted to the file. This is eventually
/// turned into the SectionCommand in the load command for a particlar
/// segment.
struct MachOSection : public BinaryObject {
std::string sectname; // name of this section,
std::string segname; // segment this section goes in
uint64_t addr; // memory address of this section
uint32_t offset; // file offset of this section
uint32_t align; // section alignment (power of 2)
uint32_t reloff; // file offset of relocation entries
uint32_t nreloc; // number of relocation entries
uint32_t flags; // flags (section type and attributes)
uint32_t reserved1; // reserved (for offset or index)
uint32_t reserved2; // reserved (for count or sizeof)
uint32_t reserved3; // reserved (64 bit only)
/// A unique number for this section, which will be used to match symbols
/// to the correct section.
uint32_t Index;
/// RelocBuffer - A buffer to hold the mach-o relocations before we write
/// them out at the appropriate location in the file.
std::vector<unsigned char> RelocBuffer;
// Constants for the section types (low 8 bits of flags field)
// see <mach-o/loader.h>
enum { S_REGULAR = 0,
// regular section
S_ZEROFILL = 1,
// zero fill on demand section
S_CSTRING_LITERALS = 2,
// section with only literal C strings
S_4BYTE_LITERALS = 3,
// section with only 4 byte literals
S_8BYTE_LITERALS = 4,
// section with only 8 byte literals
S_LITERAL_POINTERS = 5,
// section with only pointers to literals
S_NON_LAZY_SYMBOL_POINTERS = 6,
// section with only non-lazy symbol pointers
S_LAZY_SYMBOL_POINTERS = 7,
// section with only lazy symbol pointers
S_SYMBOL_STUBS = 8,
// section with only symbol stubs
// byte size of stub in the reserved2 field
S_MOD_INIT_FUNC_POINTERS = 9,
// section with only function pointers for initialization
S_MOD_TERM_FUNC_POINTERS = 10,
// section with only function pointers for termination
S_COALESCED = 11,
// section contains symbols that are coalesced
S_GB_ZEROFILL = 12,
// zero fill on demand section (that can be larger than 4GB)
S_INTERPOSING = 13,
// section with only pairs of function pointers for interposing
S_16BYTE_LITERALS = 14
// section with only 16 byte literals
};
// Constants for the section flags (high 24 bits of flags field)
// see <mach-o/loader.h>
enum { S_ATTR_PURE_INSTRUCTIONS = 1 << 31,
// section contains only true machine instructions
S_ATTR_NO_TOC = 1 << 30,
// section contains coalesced symbols that are not to be in a
// ranlib table of contents
S_ATTR_STRIP_STATIC_SYMS = 1 << 29,
// ok to strip static symbols in this section in files with the
// MY_DYLDLINK flag
S_ATTR_NO_DEAD_STRIP = 1 << 28,
// no dead stripping
S_ATTR_LIVE_SUPPORT = 1 << 27,
// blocks are live if they reference live blocks
S_ATTR_SELF_MODIFYING_CODE = 1 << 26,
// used with i386 code stubs written on by dyld
S_ATTR_DEBUG = 1 << 25,
// a debug section
S_ATTR_SOME_INSTRUCTIONS = 1 << 10,
// section contains some machine instructions
S_ATTR_EXT_RELOC = 1 << 9,
// section has external relocation entries
S_ATTR_LOC_RELOC = 1 << 8
// section has local relocation entries
};
/// cmdSize - This routine returns the size of the MachOSection as written
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
unsigned cmdSize(bool is64Bit) const {
if (is64Bit)
return 7 * sizeof(uint32_t) + 2 * sizeof(uint64_t) + 32;
else
return 9 * sizeof(uint32_t) + 32; // addresses only 32 bits
}
MachOSection(const std::string &seg, const std::string &sect)
: BinaryObject(), sectname(sect), segname(seg), addr(0), offset(0),
align(2), reloff(0), nreloc(0), flags(0), reserved1(0), reserved2(0),
reserved3(0) { }
}; // end struct MachOSection
/// MachOSymTab - This struct contains information about the offsets and
/// size of symbol table information.
/// segment.
struct MachODySymTab {
uint32_t cmd; // LC_DYSYMTAB
uint32_t cmdsize; // sizeof(MachODySymTab)
uint32_t ilocalsym; // index to local symbols
uint32_t nlocalsym; // number of local symbols
uint32_t iextdefsym; // index to externally defined symbols
uint32_t nextdefsym; // number of externally defined symbols
uint32_t iundefsym; // index to undefined symbols
uint32_t nundefsym; // number of undefined symbols
uint32_t tocoff; // file offset to table of contents
uint32_t ntoc; // number of entries in table of contents
uint32_t modtaboff; // file offset to module table
uint32_t nmodtab; // number of module table entries
uint32_t extrefsymoff; // offset to referenced symbol table
uint32_t nextrefsyms; // number of referenced symbol table entries
uint32_t indirectsymoff; // file offset to the indirect symbol table
uint32_t nindirectsyms; // number of indirect symbol table entries
uint32_t extreloff; // offset to external relocation entries
uint32_t nextrel; // number of external relocation entries
uint32_t locreloff; // offset to local relocation entries
uint32_t nlocrel; // number of local relocation entries
// Constants for the cmd field
// see <mach-o/loader.h>
enum { LC_DYSYMTAB = 0x0B // dynamic link-edit symbol table info
};
MachODySymTab() : cmd(LC_DYSYMTAB), cmdsize(20 * sizeof(uint32_t)),
ilocalsym(0), nlocalsym(0), iextdefsym(0), nextdefsym(0),
iundefsym(0), nundefsym(0), tocoff(0), ntoc(0), modtaboff(0),
nmodtab(0), extrefsymoff(0), nextrefsyms(0), indirectsymoff(0),
nindirectsyms(0), extreloff(0), nextrel(0), locreloff(0), nlocrel(0) {}
}; // end struct MachODySymTab
} // end namespace llvm
#endif

193
lib/CodeGen/MachOCodeEmitter.cpp
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@ -1,193 +0,0 @@
//===-- MachOEmitter.cpp - Target-independent Mach-O Emitter code --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MachO.h"
#include "MachOWriter.h"
#include "MachOCodeEmitter.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineRelocation.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/OutputBuffer.h"
#include <vector>
//===----------------------------------------------------------------------===//
// MachOCodeEmitter Implementation
//===----------------------------------------------------------------------===//
namespace llvm {
MachOCodeEmitter::MachOCodeEmitter(MachOWriter &mow, MachOSection &mos) :
ObjectCodeEmitter(&mos), MOW(mow), TM(MOW.TM) {
is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
isLittleEndian = TM.getTargetData()->isLittleEndian();
MAI = TM.getMCAsmInfo();
}
/// 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.
MachOSection *MOS = MOW.getTextSection();
// Upgrade the section alignment if required.
if (MOS->align < Align) MOS->align = Align;
MOS->emitAlignment(Align);
// Create symbol for function entry
const GlobalValue *FuncV = MF.getFunction();
MachOSym FnSym(FuncV, MOW.Mang->getMangledName(FuncV), MOS->Index, MAI);
FnSym.n_value = getCurrentPCOffset();
// add it to the symtab.
MOW.SymbolTable.push_back(FnSym);
}
/// 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.
MachOSection *MOS = MOW.getTextSection();
// 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()) {
// FIXME: This should be a set or something that uniques
MOW.PendingGlobals.push_back(MR.getGlobalValue());
} else {
llvm_unreachable("Unhandled relocation type");
}
MOS->addRelocation(MR);
}
Relocations.clear();
// Clear per-function data structures.
CPLocations.clear();
CPSections.clear();
JTLocations.clear();
MBBLocations.clear();
return false;
}
/// emitConstantPool - For each constant pool entry, figure out which section
/// the constant should live in, 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
assert(TM.getRelocationModel() != Reloc::PIC_ &&
"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()->getTypeAllocSize(Ty);
MachOSection *Sec = MOW.getConstSection(CP[i].Val.ConstVal);
OutputBuffer SecDataOut(Sec->getData(), is64Bit, isLittleEndian);
CPLocations.push_back(Sec->size());
CPSections.push_back(Sec->Index);
// 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);
MachOWriter::InitMem(CP[i].Val.ConstVal, CPLocations[i],
TM.getTargetData(), Sec);
}
}
/// 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
assert(TM.getRelocationModel() != Reloc::PIC_ &&
"PIC codegen not yet handled for mach-o jump tables!");
MachOSection *Sec = MOW.getJumpTableSection();
unsigned TextSecIndex = MOW.getTextSection()->Index;
OutputBuffer SecDataOut(Sec->getData(), is64Bit, isLittleEndian);
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->size());
for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi) {
MachineRelocation MR(MOW.GetJTRelocation(Sec->size(), MBBs[mi]));
MR.setResultPointer((void *)JTLocations[i]);
MR.setConstantVal(TextSecIndex);
Sec->addRelocation(MR);
SecDataOut.outaddr(0);
}
}
}
} // end namespace llvm

69
lib/CodeGen/MachOCodeEmitter.h
View File

@ -1,69 +0,0 @@
//===-- MachOEmitter.h - Target-independent Mach-O Emitter class ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef MACHOCODEEMITTER_H
#define MACHOCODEEMITTER_H
#include "llvm/CodeGen/ObjectCodeEmitter.h"
#include <map>
namespace llvm {
class MachOWriter;
/// MachOCodeEmitter - This class is used by the MachOWriter to emit the code
/// for functions to the Mach-O file.
class MachOCodeEmitter : public ObjectCodeEmitter {
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;
const MCAsmInfo *MAI;
/// Relocations - These are the relocations that the function needs, as
/// emitted.
std::vector<MachineRelocation> Relocations;
std::map<uint64_t, uintptr_t> Labels;
public:
MachOCodeEmitter(MachOWriter &mow, MachOSection &mos);
virtual void startFunction(MachineFunction &MF);
virtual bool finishFunction(MachineFunction &MF);
virtual void addRelocation(const MachineRelocation &MR) {
Relocations.push_back(MR);
}
void emitConstantPool(MachineConstantPool *MCP);
void emitJumpTables(MachineJumpTableInfo *MJTI);
virtual void emitLabel(uint64_t LabelID) {
Labels[LabelID] = getCurrentPCOffset();
}
virtual uintptr_t getLabelAddress(uint64_t Label) const {
return Labels.find(Label)->second;
}
virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) { }
}; // end class MachOCodeEmitter
} // end namespace llvm
#endif

783
lib/CodeGen/MachOWriter.cpp
View File

@ -22,33 +22,31 @@
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#include "MachO.h"
#include "MachOWriter.h" #include "MachOWriter.h"
#include "MachOCodeEmitter.h" #include "llvm/Function.h"
#include "llvm/Constants.h" #include "llvm/CodeGen/FileWriters.h"
#include "llvm/DerivedTypes.h" #include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetData.h" #include "llvm/MC/MCContext.h"
#include "llvm/Target/TargetMachine.h" #include "llvm/MC/MCCodeEmitter.h"
#include "llvm/Target/TargetMachOWriterInfo.h" #include "llvm/MC/MCInst.h"
#include "llvm/Support/Debug.h" #include "llvm/MC/MCStreamer.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/OutputBuffer.h"
#include "llvm/Support/ErrorHandling.h" #include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/raw_ostream.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 { namespace llvm {
MachineFunctionPass *createMachOWriter(formatted_raw_ostream &O,
/// AddMachOWriter - Concrete function to add the Mach-O writer to the function TargetMachine &TM,
/// pass manager. const MCAsmInfo *T,
ObjectCodeEmitter *AddMachOWriter(PassManagerBase &PM, MCCodeEmitter *MCE) {
raw_ostream &O, return new MachOWriter(O, TM, T, MCE);
TargetMachine &TM) { }
MachOWriter *MOW = new MachOWriter(O, TM);
PM.add(MOW);
return MOW->getObjectCodeEmitter();
} }
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
@ -57,722 +55,83 @@ ObjectCodeEmitter *AddMachOWriter(PassManagerBase &PM,
char MachOWriter::ID = 0; char MachOWriter::ID = 0;
MachOWriter::MachOWriter(raw_ostream &o, TargetMachine &tm) MachOWriter::MachOWriter(formatted_raw_ostream &o, TargetMachine &tm,
: MachineFunctionPass(&ID), O(o), TM(tm) { const MCAsmInfo *T, MCCodeEmitter *MCE)
is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64; : MachineFunctionPass(&ID), O(o), TM(tm), MAI(T), MCCE(MCE),
isLittleEndian = TM.getTargetData()->isLittleEndian(); OutContext(*new MCContext()),
OutStreamer(*createMachOStreamer(OutContext, O, MCCE)) {
MAI = TM.getMCAsmInfo();
// Create the machine code emitter object for this target.
MachOCE = new MachOCodeEmitter(*this, *getTextSection(true));
} }
MachOWriter::~MachOWriter() { MachOWriter::~MachOWriter() {
delete MachOCE; delete &OutStreamer;
delete &OutContext;
delete MCCE;
} }
bool MachOWriter::doInitialization(Module &M) { bool MachOWriter::doInitialization(Module &M) {
// Set the magic value, now that we know the pointer size and endianness Mang = new Mangler(M, MAI->getGlobalPrefix(), MAI->getPrivateGlobalPrefix(),
Header.setMagic(isLittleEndian, is64Bit); MAI->getLinkerPrivateGlobalPrefix());
// Set the file type if (MAI->doesAllowQuotesInName())
// FIXME: this only works for object files, we do not support the creation Mang->setUseQuotes(true);
// of dynamic libraries or executables at this time.
Header.filetype = MachOHeader::MH_OBJECT;
Mang = new Mangler(M); if (MAI->doesAllowNameToStartWithDigit())
return false; Mang->setSymbolsCanStartWithDigit(true);
}
// Initialize TargetLoweringObjectFile.
TM.getTargetLowering()->getObjFileLowering().Initialize(OutContext, TM);
bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
return false; return false;
} }
/// doFinalization - Now that the module has been completely processed, emit /// doFinalization - Now that the module has been completely processed, emit
/// the Mach-O file to 'O'. /// the Mach-O file to 'O'.
bool MachOWriter::doFinalization(Module &M) { 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. // Release the name mangler object.
delete Mang; Mang = 0; delete Mang; Mang = 0;
OutStreamer.Finish();
return false; return false;
} }
// getConstSection - Get constant section for Constant 'C' bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
MachOSection *MachOWriter::getConstSection(Constant *C) { const Function *F = MF.getFunction();
const ConstantArray *CVA = dyn_cast<ConstantArray>(C); TargetLoweringObjectFile &TLOF = TM.getTargetLowering()->getObjFileLowering();
if (CVA && CVA->isCString()) const MCSection *S = TLOF.SectionForGlobal(F, Mang, TM);
return getSection("__TEXT", "__cstring", OutStreamer.SwitchSection(S);
MachOSection::S_CSTRING_LITERALS);
const Type *Ty = C->getType(); for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
if (Ty->isPrimitiveType() || Ty->isInteger()) { I != E; ++I) {
unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty); // Print a label for the basic block.
switch(Size) { for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
default: break; // Fall through to __TEXT,__const II != IE; ++II) {
case 4: const MachineInstr *MI = II;
return getSection("__TEXT", "__literal4", MCInst OutMI;
MachOSection::S_4BYTE_LITERALS); OutMI.setOpcode(MI->getOpcode());
case 8:
return getSection("__TEXT", "__literal8",
MachOSection::S_8BYTE_LITERALS);
case 16:
return getSection("__TEXT", "__literal16",
MachOSection::S_16BYTE_LITERALS);
}
}
return getSection("__TEXT", "__const");
}
// getJumpTableSection - Select the Jump Table section for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MachOSection *MachOWriter::getJumpTableSection() { const MachineOperand &MO = MI->getOperand(i);
if (TM.getRelocationModel() == Reloc::PIC_) MCOperand MCOp;
return getTextSection(false);
else
return getSection("__TEXT", "__const");
}
// getSection - Return the section with the specified name, creating a new switch (MO.getType()) {
// section if one does not already exist. default:
MachOSection *MachOWriter::getSection(const std::string &seg, MI->dump();
const std::string &sect, llvm_unreachable("unknown operand type");
unsigned Flags /* = 0 */ ) { case MachineOperand::MO_Register:
MachOSection *MOS = SectionLookup[seg+sect]; // Ignore all implicit register operands.
if (MOS) return MOS; if (MO.isImplicit()) continue;
MCOp = MCOperand::CreateReg(MO.getReg());
MOS = new MachOSection(seg, sect); break;
SectionList.push_back(MOS); case MachineOperand::MO_Immediate:
MOS->Index = SectionList.size(); MCOp = MCOperand::CreateImm(MO.getImm());
MOS->flags = MachOSection::S_REGULAR | Flags; break;
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");
} }
break; OutMI.addOperand(MCOp);
} }
case Type::FloatTyID: {
uint32_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt(). OutStreamer.EmitInstruction(OutMI);
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!");
} }
} }
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

180
lib/CodeGen/MachOWriter.h
View File

@ -15,191 +15,73 @@
#define MACHOWRITER_H #define MACHOWRITER_H
#include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineFunctionPass.h"
#include <vector> #include "llvm/Target/TargetMachine.h"
#include <map>
namespace llvm { namespace llvm {
class Constant;
class GlobalVariable; class GlobalVariable;
class Mangler; class Mangler;
class MachineBasicBlock; class MCCodeEmitter;
class MachineRelocation; class MCContext;
class MachOCodeEmitter; class MCStreamer;
struct MachODySymTab;
struct MachOHeader;
struct MachOSection;
struct MachOSym;
class TargetData;
class TargetMachine;
class MCAsmInfo;
class ObjectCodeEmitter;
class OutputBuffer;
class raw_ostream;
/// MachOWriter - This class implements the common target-independent code for /// MachOWriter - This class implements the common target-independent code for
/// writing Mach-O files. Targets should derive a class from this to /// writing Mach-O files. Targets should derive a class from this to
/// parameterize the output format. /// parameterize the output format.
/// ///
class MachOWriter : public MachineFunctionPass { class MachOWriter : public MachineFunctionPass {
friend class MachOCodeEmitter;
public:
static char ID; static char ID;
ObjectCodeEmitter *getObjectCodeEmitter() {
return reinterpret_cast<ObjectCodeEmitter*>(MachOCE);
}
MachOWriter(raw_ostream &O, TargetMachine &TM);
virtual ~MachOWriter();
virtual const char *getPassName() const {
return "Mach-O Writer";
}
protected: protected:
/// Output stream to send the resultant object file to. /// Output stream to send the resultant object file to.
/// ///
raw_ostream &O; formatted_raw_ostream &O;
/// Target machine description. /// Target machine description.
/// ///
TargetMachine &TM; TargetMachine &TM;
/// Mang - The object used to perform name mangling for this module. /// Target Asm Printer information.
/// ///
Mangler *Mang;
/// MachOCE - The MachineCodeEmitter object that we are exposing to emit
/// machine code for functions to the .o file.
MachOCodeEmitter *MachOCE;
/// is64Bit/isLittleEndian - This information is inferred from the target
/// machine directly, indicating what header values and flags to set.
bool is64Bit, isLittleEndian;
// Target Asm Info
const MCAsmInfo *MAI; const MCAsmInfo *MAI;
/// Header - An instance of MachOHeader that we will update while we build /// MCCE - The MCCodeEmitter object that we are exposing to emit machine
/// the file, and then emit during finalization. /// code for functions to the .o file.
MachOHeader Header; MCCodeEmitter *MCCE;
/// OutContext - This is the context for the output file that we are
/// streaming. This owns all of the global MC-related objects for the
/// generated translation unit.
MCContext &OutContext;
/// OutStreamer - This is the MCStreamer object for the file we are
/// generating. This contains the transient state for the current
/// translation unit that we are generating (such as the current section
/// etc).
MCStreamer &OutStreamer;
/// Name-mangler for global names.
///
Mangler *Mang;
/// doInitialization - Emit the file header and all of the global variables /// doInitialization - Emit the file header and all of the global variables
/// for the module to the Mach-O file. /// for the module to the Mach-O file.
bool doInitialization(Module &M); bool doInitialization(Module &M);
bool runOnMachineFunction(MachineFunction &MF);
/// doFinalization - Now that the module has been completely processed, emit /// doFinalization - Now that the module has been completely processed, emit
/// the Mach-O file to 'O'. /// the Mach-O file to 'O'.
bool doFinalization(Module &M); bool doFinalization(Module &M);
private: bool runOnMachineFunction(MachineFunction &MF);
/// SectionList - This is the list of sections that we have emitted to the public:
/// file. Once the file has been completely built, the segment load command explicit MachOWriter(formatted_raw_ostream &O, TargetMachine &TM,
/// SectionCommands are constructed from this info. const MCAsmInfo *T, MCCodeEmitter *MCE);
std::vector<MachOSection*> SectionList;
/// SectionLookup - This is a mapping from section name to SectionList entry virtual ~MachOWriter();
std::map<std::string, MachOSection*> SectionLookup;
/// GVSection - This is a mapping from a GlobalValue to a MachOSection, virtual const char *getPassName() const {
/// to aid in emitting relocations. return "Mach-O Writer";
std::map<GlobalValue*, MachOSection*> GVSection;
/// GVOffset - This is a mapping from a GlobalValue to an offset from the
/// start of the section in which the GV resides, to aid in emitting
/// relocations.
std::map<GlobalValue*, intptr_t> GVOffset;
/// getSection - Return the section with the specified name, creating a new
/// section if one does not already exist.
MachOSection *getSection(const std::string &seg, const std::string &sect,
unsigned Flags = 0);
/// getTextSection - Return text section with different flags for code/data
MachOSection *getTextSection(bool isCode = true);
MachOSection *getDataSection() {
return getSection("__DATA", "__data");
} }
MachOSection *getBSSSection();
MachOSection *getConstSection(Constant *C);
MachOSection *getJumpTableSection();
/// MachOSymTab - This struct contains information about the offsets and
/// size of symbol table information.
/// segment.
struct MachOSymTab {
uint32_t cmd; // LC_SYMTAB
uint32_t cmdsize; // sizeof( MachOSymTab )
uint32_t symoff; // symbol table offset
uint32_t nsyms; // number of symbol table entries
uint32_t stroff; // string table offset
uint32_t strsize; // string table size in bytes
// Constants for the cmd field
// see <mach-o/loader.h>
enum { LC_SYMTAB = 0x02 // link-edit stab symbol table info
};
MachOSymTab() : cmd(LC_SYMTAB), cmdsize(6 * sizeof(uint32_t)), symoff(0),
nsyms(0), stroff(0), strsize(0) { }
};
/// SymTab - The "stab" style symbol table information
MachOSymTab SymTab;
/// DySymTab - symbol table info for the dynamic link editor
MachODySymTab DySymTab;
protected:
/// SymbolTable - This is the list of symbols we have emitted to the file.
/// This actually gets rearranged before emission to the file (to put the
/// local symbols first in the list).
std::vector<MachOSym> SymbolTable;
/// SymT - A buffer to hold the symbol table before we write it out at the
/// appropriate location in the file.
std::vector<unsigned char> SymT;
/// StrT - A buffer to hold the string table before we write it out at the
/// appropriate location in the file.
std::vector<unsigned char> StrT;
/// PendingSyms - This is a list of externally defined symbols that we have
/// been asked to emit, but have not seen a reference to. When a reference
/// is seen, the symbol will move from this list to the SymbolTable.
std::vector<GlobalValue*> PendingGlobals;
/// DynamicSymbolTable - This is just a vector of indices into
/// SymbolTable to aid in emitting the DYSYMTAB load command.
std::vector<unsigned> DynamicSymbolTable;
static void InitMem(const Constant *C, uintptr_t Offset,
const TargetData *TD, MachOSection* mos);
private:
void AddSymbolToSection(MachOSection *MOS, GlobalVariable *GV);
void EmitGlobal(GlobalVariable *GV);
void EmitHeaderAndLoadCommands();
void EmitSections();
void EmitRelocations();
void BufferSymbolAndStringTable();
void CalculateRelocations(MachOSection &MOS);
// GetJTRelocation - Get a relocation a new BB relocation based
// on target information.
MachineRelocation GetJTRelocation(unsigned Offset,
MachineBasicBlock *MBB) const;
/// GetTargetRelocation - Returns the number of relocations.
unsigned GetTargetRelocation(MachineRelocation &MR, unsigned FromIdx,
unsigned ToAddr, unsigned ToIndex,
OutputBuffer &RelocOut, OutputBuffer &SecOut,
bool Scattered, bool Extern);
}; };
} }

2
tools/llc/llc.cpp
View File

@ -366,9 +366,7 @@ int main(int argc, char **argv) {
sys::Path(OutputFilename).eraseFromDisk(); sys::Path(OutputFilename).eraseFromDisk();
return 1; return 1;
case FileModel::AsmFile: case FileModel::AsmFile:
break;
case FileModel::MachOFile: case FileModel::MachOFile:
OCE = AddMachOWriter(Passes, *Out, Target);
break; break;
case FileModel::ElfFile: case FileModel::ElfFile:
OCE = AddELFWriter(Passes, *Out, Target); OCE = AddELFWriter(Passes, *Out, Target);

4
tools/lto/LTOCodeGenerator.cpp
View File

@ -403,14 +403,12 @@ bool LTOCodeGenerator::generateAssemblyCode(formatted_raw_ostream& out,
switch (_target->addPassesToEmitFile(*codeGenPasses, out, switch (_target->addPassesToEmitFile(*codeGenPasses, out,
TargetMachine::AssemblyFile, TargetMachine::AssemblyFile,
CodeGenOpt::Aggressive)) { CodeGenOpt::Aggressive)) {
case FileModel::MachOFile:
oce = AddMachOWriter(*codeGenPasses, out, *_target);
break;
case FileModel::ElfFile: case FileModel::ElfFile:
oce = AddELFWriter(*codeGenPasses, out, *_target); oce = AddELFWriter(*codeGenPasses, out, *_target);
break; break;
case FileModel::AsmFile: case FileModel::AsmFile:
break; break;
case FileModel::MachOFile:
case FileModel::Error: case FileModel::Error:
case FileModel::None: case FileModel::None:
errMsg = "target file type not supported"; errMsg = "target file type not supported";