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e025323d29
This patch adds support for the MachO .alt_entry assembly directive, and uses it for global aliases with non-zero GEP offsets. The alt_entry flag indicates that a symbol should be layed out immediately after the preceding symbol. Conceptually it introduces an alternate entry point for a function or data structure. E.g.: safe_foo: // check preconditions for foo .alt_entry fast_foo fast_foo: // body of foo, can assume preconditions. The .alt_entry flag is also implicitly set on assembly aliases of the form: a = b + C where C is a non-zero constant, since these have the same effect as an alt_entry symbol: they introduce a label that cannot be moved relative to the preceding one. Setting the alt_entry flag on aliases of this form fixes http://llvm.org/PR25381. llvm-svn: 263521
39 lines
1.1 KiB
ArmAsm
39 lines
1.1 KiB
ArmAsm
// RUN: llvm-mc -triple x86_64-apple-darwin10 %s -filetype=obj -o - | llvm-readobj -r -t | FileCheck %s
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// rdar://9906375
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.org 0x100
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_foo:
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_bar = _foo + 2
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_baz:
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leaq _bar(%rip), %rcx
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// CHECK: File: <stdin>
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// CHECK-NEXT: Format: Mach-O 64-bit x86-64
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// CHECK-NEXT: Arch: x86_64
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// CHECK-NEXT: AddressSize: 64bit
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// CHECK-NEXT: Relocations [
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// CHECK-NEXT: Section __text {
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// CHECK-NEXT: 0x103 1 2 1 X86_64_RELOC_SIGNED 0 _bar
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// CHECK-NEXT: Symbols [
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: _foo (11)
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// CHECK-NEXT: Type: Section (0xE)
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// CHECK-NEXT: Section: __text (0x1)
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// CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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// CHECK-NEXT: Flags [ (0x0)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Value: 0x100
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: _bar (6)
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// CHECK-NEXT: Type: Section (0xE)
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// CHECK-NEXT: Section: __text (0x1)
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// CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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// CHECK-NEXT: Flags [ (0x200)
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// CHECK-NEXT: AltEntry (0x200)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Value: 0x102
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// CHECK-NEXT: }
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