mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-27 22:55:15 +00:00
1997473cf7
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36662 91177308-0d34-0410-b5e6-96231b3b80d8
628 lines
26 KiB
C++
628 lines
26 KiB
C++
//=== MachOWriter.h - Target-independent Mach-O writer support --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by Nate Begeman and is distributed under the
|
|
// University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the MachOWriter class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef MACHOWRITER_H
|
|
#define MACHOWRITER_H
|
|
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineRelocation.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetMachOWriterInfo.h"
|
|
|
|
namespace llvm {
|
|
class GlobalVariable;
|
|
class Mangler;
|
|
class MachineCodeEmitter;
|
|
class MachOCodeEmitter;
|
|
class OutputBuffer;
|
|
|
|
/// 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,
|
|
TargetMachine &TM);
|
|
};
|
|
|
|
/// MachOWriter - This class implements the common target-independent code for
|
|
/// writing Mach-O files. Targets should derive a class from this to
|
|
/// parameterize the output format.
|
|
///
|
|
class MachOWriter : public MachineFunctionPass {
|
|
friend class MachOCodeEmitter;
|
|
public:
|
|
static char ID;
|
|
MachineCodeEmitter &getMachineCodeEmitter() const {
|
|
return *(MachineCodeEmitter*)MCE;
|
|
}
|
|
|
|
MachOWriter(std::ostream &O, TargetMachine &TM);
|
|
virtual ~MachOWriter();
|
|
|
|
virtual const char *getPassName() const {
|
|
return "Mach-O Writer";
|
|
}
|
|
|
|
typedef std::vector<unsigned char> DataBuffer;
|
|
protected:
|
|
/// Output stream to send the resultant object file to.
|
|
///
|
|
std::ostream &O;
|
|
|
|
/// Target machine description.
|
|
///
|
|
TargetMachine &TM;
|
|
|
|
/// Mang - The object used to perform name mangling for this module.
|
|
///
|
|
Mangler *Mang;
|
|
|
|
/// MCE - The MachineCodeEmitter object that we are exposing to emit machine
|
|
/// code for functions to the .o file.
|
|
MachOCodeEmitter *MCE;
|
|
|
|
/// is64Bit/isLittleEndian - This information is inferred from the target
|
|
/// machine directly, indicating what header values and flags to set.
|
|
bool is64Bit, isLittleEndian;
|
|
|
|
/// doInitialization - Emit the file header and all of the global variables
|
|
/// for the module to the Mach-O file.
|
|
bool doInitialization(Module &M);
|
|
|
|
bool runOnMachineFunction(MachineFunction &MF);
|
|
|
|
/// doFinalization - Now that the module has been completely processed, emit
|
|
/// the Mach-O file to 'O'.
|
|
bool doFinalization(Module &M);
|
|
|
|
/// 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.
|
|
DataBuffer 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;
|
|
}
|
|
};
|
|
|
|
/// Header - An instance of MachOHeader that we will update while we build
|
|
/// the file, and then emit during finalization.
|
|
MachOHeader Header;
|
|
|
|
/// 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 {
|
|
std::string sectname; // name of this section,
|
|
std::string segname; // segment this section goes in
|
|
uint64_t addr; // memory address of this section
|
|
uint64_t size; // size in bytes 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;
|
|
|
|
/// SectionData - The actual data for this section which we are building
|
|
/// up for emission to the file.
|
|
DataBuffer SectionData;
|
|
|
|
/// RelocBuffer - A buffer to hold the mach-o relocations before we write
|
|
/// them out at the appropriate location in the file.
|
|
DataBuffer RelocBuffer;
|
|
|
|
/// Relocations - The relocations that we have encountered so far in this
|
|
/// section that we will need to convert to MachORelocation entries when
|
|
/// the file is written.
|
|
std::vector<MachineRelocation> Relocations;
|
|
|
|
// 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 §)
|
|
: sectname(sect), segname(seg), addr(0), size(0), offset(0), align(2),
|
|
reloff(0), nreloc(0), flags(0), reserved1(0), reserved2(0),
|
|
reserved3(0) { }
|
|
};
|
|
|
|
private:
|
|
|
|
/// SectionList - This is the list of sections that we have emitted to the
|
|
/// file. Once the file has been completely built, the segment load command
|
|
/// SectionCommands are constructed from this info.
|
|
std::vector<MachOSection*> SectionList;
|
|
|
|
/// SectionLookup - This is a mapping from section name to SectionList entry
|
|
std::map<std::string, MachOSection*> SectionLookup;
|
|
|
|
/// GVSection - This is a mapping from a GlobalValue to a MachOSection,
|
|
/// to aid in emitting relocations.
|
|
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 §,
|
|
unsigned Flags = 0) {
|
|
MachOSection *MOS = SectionLookup[seg+sect];
|
|
if (MOS) return MOS;
|
|
|
|
MOS = new MachOSection(seg, sect);
|
|
SectionList.push_back(MOS);
|
|
MOS->Index = SectionList.size();
|
|
MOS->flags = MachOSection::S_REGULAR | Flags;
|
|
SectionLookup[seg+sect] = MOS;
|
|
return MOS;
|
|
}
|
|
MachOSection *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 *getBSSSection() {
|
|
return getSection("__DATA", "__bss", MachOSection::S_ZEROFILL);
|
|
}
|
|
MachOSection *getDataSection() {
|
|
return getSection("__DATA", "__data");
|
|
}
|
|
MachOSection *getConstSection(Constant *C) {
|
|
const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
|
|
if (CVA && CVA->isCString())
|
|
return getSection("__TEXT", "__cstring",
|
|
MachOSection::S_CSTRING_LITERALS);
|
|
|
|
const Type *Ty = C->getType();
|
|
if (Ty->isPrimitiveType() || Ty->isInteger()) {
|
|
unsigned Size = TM.getTargetData()->getTypeSize(Ty);
|
|
switch(Size) {
|
|
default: break; // Fall through to __TEXT,__const
|
|
case 4:
|
|
return getSection("__TEXT", "__literal4",
|
|
MachOSection::S_4BYTE_LITERALS);
|
|
case 8:
|
|
return getSection("__TEXT", "__literal8",
|
|
MachOSection::S_8BYTE_LITERALS);
|
|
case 16:
|
|
return getSection("__TEXT", "__literal16",
|
|
MachOSection::S_16BYTE_LITERALS);
|
|
}
|
|
}
|
|
return getSection("__TEXT", "__const");
|
|
}
|
|
MachOSection *getJumpTableSection() {
|
|
if (TM.getRelocationModel() == Reloc::PIC_)
|
|
return getTextSection(false);
|
|
else
|
|
return getSection("__TEXT", "__const");
|
|
}
|
|
|
|
/// 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) { }
|
|
};
|
|
|
|
/// 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) { }
|
|
};
|
|
|
|
/// SymTab - The "stab" style symbol table information
|
|
MachOSymTab SymTab;
|
|
/// DySymTab - symbol table info for the dynamic link editor
|
|
MachODySymTab DySymTab;
|
|
|
|
struct MachOSymCmp {
|
|
// 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 bool PartitionByLocal(const MachOSym &Sym);
|
|
|
|
/// PartitionByDefined - Simple boolean predicate that returns true if Sym
|
|
/// is defined in this module.
|
|
static bool PartitionByDefined(const MachOSym &Sym);
|
|
|
|
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.
|
|
DataBuffer SymT;
|
|
|
|
/// StrT - A buffer to hold the string table before we write it out at the
|
|
/// appropriate location in the file.
|
|
DataBuffer 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, void *Addr, intptr_t Offset,
|
|
const TargetData *TD,
|
|
std::vector<MachineRelocation> &MRs);
|
|
|
|
private:
|
|
void AddSymbolToSection(MachOSection *MOS, GlobalVariable *GV);
|
|
void EmitGlobal(GlobalVariable *GV);
|
|
void EmitHeaderAndLoadCommands();
|
|
void EmitSections();
|
|
void BufferSymbolAndStringTable();
|
|
void CalculateRelocations(MachOSection &MOS);
|
|
|
|
MachineRelocation GetJTRelocation(unsigned Offset,
|
|
MachineBasicBlock *MBB) const {
|
|
return TM.getMachOWriterInfo()->GetJTRelocation(Offset, MBB);
|
|
}
|
|
|
|
/// GetTargetRelocation - Returns the number of relocations.
|
|
unsigned 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);
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|