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Fix a Darwin x86_64 special case of a jmp to a temporary symbol from an atom

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without a base symbol that must not have a relocation entry.

llvm-svn: 139316
This commit is contained in:
Kevin Enderby 2011-09-08 20:53:44 +00:00
parent 3c40c2100b
commit 16f9df1f05
2 changed files with 68 additions and 0 deletions
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10
lib/MC/MachObjectWriter.cpp
View File

@ -590,6 +590,16 @@ IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
return false;
return true;
}
// For Darwin x86_64, there is one special case when the reference IsPCRel.
// If the fragment with the reference does not have a base symbol but meets
// the simple way of dealing with this, in that it is a temporary symbol in
// the same atom then it is assumed to be fully resolved. This is needed so
// a relocation entry is not created and so the staitic linker does not
// mess up the reference later.
else if(!FB.getAtom() &&
SA.isTemporary() && SA.isInSection() && &SecA == &SecB){
return true;
}
} else {
if (!TargetObjectWriter->useAggressiveSymbolFolding())
return false;

58
test/MC/MachO/darwin-x86_64-nobase-relocs.s Normal file
View File

@ -0,0 +1,58 @@
// RUN: llvm-mc -n -triple x86_64-apple-darwin9 %s -filetype=obj -o - | macho-dump --dump-section-data | FileCheck %s
// Test case for rdar://10062261
// Must be no base, non-temporary, symbol before the reference to Lbar at the
// start of the section. What we are testing for is that the reference does not
// create a relocation entry.
.text
Ladd:
nop
jmp Lbar
.byte 0x0f,0x1f,0x40,0x00
.byte 0x0f,0x1f,0x40,0x00
Lbar:
mov $1, %eax
ret
// CHECK: ('cputype', 16777223)
// CHECK: ('cpusubtype', 3)
// CHECK: ('filetype', 1)
// CHECK: ('num_load_commands', 1)
// CHECK: ('load_commands_size', 152)
// CHECK: ('flag', 0)
// CHECK: ('reserved', 0)
// CHECK: ('load_commands', [
// CHECK: # Load Command 0
// CHECK: (('command', 25)
// CHECK: ('size', 152)
// 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', 17)
// CHECK: ('file_offset', 184)
// CHECK: ('file_size', 17)
// CHECK: ('maxprot', 7)
// CHECK: ('initprot', 7)
// CHECK: ('num_sections', 1)
// CHECK: ('flags', 0)
// CHECK: ('sections', [
// CHECK: # Section 0
// CHECK: (('section_name', '__text\x00\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', 0)
// CHECK: ('size', 17)
// CHECK: ('offset', 184)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 0)
// CHECK: ('num_reloc', 0)
// CHECK: ('flags', 0x80000400)
// CHECK: ('reserved1', 0)
// CHECK: ('reserved2', 0)
// CHECK: ('reserved3', 0)
// CHECK: ),
// CHECK: ('_relocations', [
// CHECK: ])
// CHECK: ('_section_data', '90eb080f 1f40000f 1f4000b8 01000000 c3')
// CHECK: ])
// CHECK: ),
// CHECK: ])