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Fix i386 relocations to Weak Definitions. The relocation entries should be

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external and the item to be relocated should not have the address of the
symbol added in.

llvm-svn: 103302
This commit is contained in:
Kevin Enderby 2010-05-07 21:44:23 +00:00
parent 0743ea736f
commit 3807a4746a
4 changed files with 113 additions and 58 deletions
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44
include/llvm/MC/MCMachOSymbolFlags.h Normal file
View File

@ -0,0 +1,44 @@
//===- MCMachOSymbolFlags.h - MachO Symbol Flags ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the SymbolFlags used for the MachO target.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCMACHOSYMBOLFLAGS_H
#define LLVM_MC_MCMACHOSYMBOLFLAGS_H
// These flags are mostly used in MCMachOStreamer.cpp but also needed in
// MachObjectWriter.cpp to test for Weak Definitions of symbols to emit
// the correct relocation information.
namespace llvm {
/// SymbolFlags - We store the value for the 'desc' symbol field in the lowest
/// 16 bits of the implementation defined flags.
enum SymbolFlags { // See <mach-o/nlist.h>.
SF_DescFlagsMask = 0xFFFF,
// Reference type flags.
SF_ReferenceTypeMask = 0x0007,
SF_ReferenceTypeUndefinedNonLazy = 0x0000,
SF_ReferenceTypeUndefinedLazy = 0x0001,
SF_ReferenceTypeDefined = 0x0002,
SF_ReferenceTypePrivateDefined = 0x0003,
SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
// Other 'desc' flags.
SF_NoDeadStrip = 0x0020,
SF_WeakReference = 0x0040,
SF_WeakDefinition = 0x0080
};
} // end namespace llvm
#endif

20
lib/MC/MCMachOStreamer.cpp
View File

@ -16,6 +16,7 @@
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCMachOSymbolFlags.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
@ -25,25 +26,6 @@ using namespace llvm;
namespace {
class MCMachOStreamer : public MCStreamer {
/// SymbolFlags - We store the value for the 'desc' symbol field in the lowest
/// 16 bits of the implementation defined flags.
enum SymbolFlags { // See <mach-o/nlist.h>.
SF_DescFlagsMask = 0xFFFF,
// Reference type flags.
SF_ReferenceTypeMask = 0x0007,
SF_ReferenceTypeUndefinedNonLazy = 0x0000,
SF_ReferenceTypeUndefinedLazy = 0x0001,
SF_ReferenceTypeDefined = 0x0002,
SF_ReferenceTypePrivateDefined = 0x0003,
SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
// Other 'desc' flags.
SF_NoDeadStrip = 0x0020,
SF_WeakReference = 0x0040,
SF_WeakDefinition = 0x0080
};
private:
MCAssembler Assembler;

13
lib/MC/MachObjectWriter.cpp
View File

@ -16,6 +16,7 @@
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCMachOSymbolFlags.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MachO.h"
@ -753,9 +754,19 @@ public:
const MCSymbol *Symbol = &Target.getSymA()->getSymbol();
MCSymbolData *SD = &Asm.getSymbolData(*Symbol);
if (Symbol->isUndefined()) {
// Both references to undefined symbols and references to Weak Definitions
// get external relocation entries. This is so the static and then the
// the dynamic linker can resolve them to the actual definition that will
// be used. And in the case of Weak Definitions a reference to one will
// not always be to the definition in the same object file.
if (Symbol->isUndefined() || (SD->getFlags() & SF_WeakDefinition)) {
IsExtern = 1;
Index = SD->getIndex();
// In the case of a Weak Definition the FixedValue needs to be set to
// to not have the address of the symbol. In the case of an undefined
// symbol you can't call getSymbolAddress().
if (SD->getFlags() & SF_WeakDefinition)
FixedValue -= Layout.getSymbolAddress(SD);
Value = 0;
} else {
// The index is the section ordinal (1-based).

94
test/MC/MachO/reloc.s
View File

@ -44,6 +44,13 @@ L1:
.objc_class_name_A=0
.globl .objc_class_name_A
.text
.globl _f1
.weak_definition _f1
_f1:
.data
.long _f1
// CHECK: ('cputype', 7)
// CHECK: ('cpusubtype', 3)
// CHECK: ('filetype', 1)
@ -56,9 +63,9 @@ L1:
// CHECK: ('size', 260)
// CHECK: ('segment_name', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('vm_addr', 0)
// CHECK: ('vm_size', 63)
// CHECK: ('vm_size', 67)
// CHECK: ('file_offset', 392)
// CHECK: ('file_size', 63)
// CHECK: ('file_size', 67)
// CHECK: ('maxprot', 7)
// CHECK: ('initprot', 7)
// CHECK: ('num_sections', 3)
@ -71,7 +78,7 @@ L1:
// CHECK: ('size', 8)
// CHECK: ('offset', 392)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 456)
// CHECK: ('reloc_offset', 460)
// CHECK: ('num_reloc', 1)
// CHECK: ('flags', 0x80000400)
// CHECK: ('reserved1', 0)
@ -82,58 +89,61 @@ L1:
// CHECK: (('word-0', 0x1),
// CHECK: ('word-1', 0x5000003)),
// CHECK: ])
// CHECK: ('_section_data', '\xe92\x00\x00\x00\xeb\xf9\xc3')
// CHECK: ('_section_data', '\xe96\x00\x00\x00\xeb\xf9\xc3')
// CHECK: # Section 1
// CHECK: (('section_name', '__data\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('address', 8)
// CHECK: ('size', 43)
// CHECK: ('size', 47)
// CHECK: ('offset', 400)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 464)
// CHECK: ('num_reloc', 9)
// CHECK: ('reloc_offset', 468)
// CHECK: ('num_reloc', 10)
// CHECK: ('flags', 0x0)
// CHECK: ('reserved1', 0)
// CHECK: ('reserved2', 0)
// CHECK: ),
// CHECK: ('_relocations', [
// CHECK: # Relocation 0
// CHECK: (('word-0', 0x2b),
// CHECK: ('word-1', 0xc000007)),
// CHECK: # Relocation 1
// CHECK: (('word-0', 0x8000002a),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 1
// CHECK: # Relocation 2
// CHECK: (('word-0', 0x90000028),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 2
// CHECK: # Relocation 3
// CHECK: (('word-0', 0xa0000024),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 3
// CHECK: # Relocation 4
// CHECK: (('word-0', 0xa0000020),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 4
// CHECK: # Relocation 5
// CHECK: (('word-0', 0xa4000014),
// CHECK: ('word-1', 0x1c)),
// CHECK: # Relocation 5
// CHECK: # Relocation 6
// CHECK: (('word-0', 0xa1000000),
// CHECK: ('word-1', 0x24)),
// CHECK: # Relocation 6
// CHECK: # Relocation 7
// CHECK: (('word-0', 0x8),
// CHECK: ('word-1', 0x4000002)),
// CHECK: # Relocation 7
// CHECK: (('word-0', 0x4),
// CHECK: ('word-1', 0xc000008)),
// CHECK: # Relocation 8
// CHECK: (('word-0', 0x4),
// CHECK: ('word-1', 0xc000009)),
// CHECK: # Relocation 9
// CHECK: (('word-0', 0x0),
// CHECK: ('word-1', 0xc000008)),
// CHECK: ('word-1', 0xc000009)),
// CHECK: ])
// CHECK: ('_section_data', '\x00\x00\x00\x00\x04\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xed\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x19\x00\x00\x00"\x00\x00\x00,\x00q')
// CHECK: ('_section_data', '\x00\x00\x00\x00\x04\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xed\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x19\x00\x00\x00"\x00\x00\x00,\x00q\x00\x00\x00\x00')
// CHECK: # Section 2
// CHECK: (('section_name', '__const\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('address', 51)
// CHECK: ('address', 55)
// CHECK: ('size', 12)
// CHECK: ('offset', 443)
// CHECK: ('offset', 447)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 536)
// CHECK: ('reloc_offset', 548)
// CHECK: ('num_reloc', 4)
// CHECK: ('flags', 0x0)
// CHECK: ('reserved1', 0)
@ -151,22 +161,22 @@ L1:
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 3
// CHECK: (('word-0', 0xa1000000),
// CHECK: ('word-1', 0x33)),
// CHECK: ('word-1', 0x37)),
// CHECK: ])
// CHECK: ('_section_data', '\x06\x00\x00\x007\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('_section_data', '\x02\x00\x00\x00;\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ])
// CHECK: ),
// CHECK: # Load Command 1
// CHECK: (('command', 2)
// CHECK: ('size', 24)
// CHECK: ('symoff', 568)
// CHECK: ('nsyms', 9)
// CHECK: ('stroff', 676)
// CHECK: ('strsize', 84)
// CHECK: ('_string_data', '\x00undef\x00local_a_ext\x00.objc_class_name_A\x00local_a\x00local_a_elt\x00local_b\x00local_c\x00bar\x00_f0\x00\x00\x00')
// CHECK: ('symoff', 580)
// CHECK: ('nsyms', 10)
// CHECK: ('stroff', 700)
// CHECK: ('strsize', 88)
// CHECK: ('_string_data', '\x00undef\x00local_a_ext\x00.objc_class_name_A\x00_f1\x00local_a\x00local_a_elt\x00local_b\x00local_c\x00bar\x00_f0\x00\x00\x00')
// CHECK: ('_symbols', [
// CHECK: # Symbol 0
// CHECK: (('n_strx', 38)
// CHECK: (('n_strx', 42)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -174,7 +184,7 @@ L1:
// CHECK: ('_string', 'local_a')
// CHECK: ),
// CHECK: # Symbol 1
// CHECK: (('n_strx', 46)
// CHECK: (('n_strx', 50)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -182,7 +192,7 @@ L1:
// CHECK: ('_string', 'local_a_elt')
// CHECK: ),
// CHECK: # Symbol 2
// CHECK: (('n_strx', 58)
// CHECK: (('n_strx', 62)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -190,7 +200,7 @@ L1:
// CHECK: ('_string', 'local_b')
// CHECK: ),
// CHECK: # Symbol 3
// CHECK: (('n_strx', 66)
// CHECK: (('n_strx', 70)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -198,15 +208,15 @@ L1:
// CHECK: ('_string', 'local_c')
// CHECK: ),
// CHECK: # Symbol 4
// CHECK: (('n_strx', 74)
// CHECK: (('n_strx', 78)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 3)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 51)
// CHECK: ('n_value', 55)
// CHECK: ('_string', 'bar')
// CHECK: ),
// CHECK: # Symbol 5
// CHECK: (('n_strx', 78)
// CHECK: (('n_strx', 82)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 1)
// CHECK: ('n_desc', 0)
@ -222,6 +232,14 @@ L1:
// CHECK: ('_string', '.objc_class_name_A')
// CHECK: ),
// CHECK: # Symbol 7
// CHECK: (('n_strx', 38)
// CHECK: ('n_type', 0xf)
// CHECK: ('n_sect', 1)
// CHECK: ('n_desc', 128)
// CHECK: ('n_value', 8)
// CHECK: ('_string', '_f1')
// CHECK: ),
// CHECK: # Symbol 8
// CHECK: (('n_strx', 7)
// CHECK: ('n_type', 0xf)
// CHECK: ('n_sect', 2)
@ -229,7 +247,7 @@ L1:
// CHECK: ('n_value', 16)
// CHECK: ('_string', 'local_a_ext')
// CHECK: ),
// CHECK: # Symbol 8
// CHECK: # Symbol 9
// CHECK: (('n_strx', 1)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
@ -245,8 +263,8 @@ L1:
// CHECK: ('ilocalsym', 0)
// CHECK: ('nlocalsym', 6)
// CHECK: ('iextdefsym', 6)
// CHECK: ('nextdefsym', 2)
// CHECK: ('iundefsym', 8)
// CHECK: ('nextdefsym', 3)
// CHECK: ('iundefsym', 9)
// CHECK: ('nundefsym', 1)
// CHECK: ('tocoff', 0)
// CHECK: ('ntoc', 0)