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5b34d5a3c7
For COFF and MachO, sections semantically have relocations that apply to them. That is not the case on ELF. In relocatable objects (.o), a section with relocations in ELF has offsets to another section where the relocations should be applied. In dynamic objects and executables, relocations don't have an offset, they have a virtual address. The section sh_info may or may not point to another section, but that is not actually used for resolving the relocations. This patch exposes that in the ObjectFile API. It has the following advantages: * Most (all?) clients can handle this more efficiently. They will normally walk all relocations, so doing an effort to iterate in a particular order doesn't save time. * llvm-readobj now prints relocations in the same way the native readelf does. * probably most important, relocations that don't point to any section are now visible. This is the case of relocations in the rela.dyn section. See the updated relocation-executable.test for example. llvm-svn: 182908
28 lines
926 B
LLVM
28 lines
926 B
LLVM
; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs -filetype=obj < %s | llvm-readobj -s -r | FileCheck %s
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define i64 @testfn() nounwind {
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entry:
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ret i64 0
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}
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define i64 @foo() nounwind {
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entry:
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%bar = alloca i64 ()*, align 8
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store i64 ()* @testfn, i64 ()** %bar, align 8
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%call = call i64 @testfn()
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ret i64 %call
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}
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; The above should produce an ADRP/ADD pair to calculate the address of
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; testfn. The important point is that LLVM shouldn't think it can deal with the
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; relocation on the ADRP itself (even though it knows everything about the
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; relative offsets of testfn and foo) because its value depends on where this
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; object file's .text section gets relocated in memory.
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; CHECK: Relocations [
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; CHECK-NEXT: Section (2) .rela.text {
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; CHECK-NEXT: 0x10 R_AARCH64_ADR_PREL_PG_HI21 testfn 0x0
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; CHECK-NEXT: 0x14 R_AARCH64_ADD_ABS_LO12_NC testfn 0x0
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; CHECK-NEXT: }
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; CHECK-NEXT: ]
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