415c0cd698
The new Darwin backend for LLD is now able to link reasonably large real-world programs on x86_64. For instance, we have achieved self-hosting for the X86_64 target, where all LLD tests pass when building lld with itself on macOS. As such, we would like to make it the default back-end. The new port is now named `ld64.lld`, and the old port remains accessible as `ld64.lld.darwinold` This [annoucement email][1] has some context. (But note that, unlike what the email says, we are no longer doing this as part of the LLVM 12 branch cut -- instead we will go into LLVM 13.) Numerous mechanical test changes were required to make this change; in the interest of creating something that's reviewable on Phabricator, I've split out the boring changes into a separate diff (D95905). I plan to merge its contents with those in this diff before landing. (@gkm made the original draft of this diff, and he has agreed to let me take over.) [1]: https://lists.llvm.org/pipermail/llvm-dev/2021-January/147665.html Reviewed By: #lld-macho, thakis Differential Revision: https://reviews.llvm.org/D95204
73 lines
2.3 KiB
YAML
73 lines
2.3 KiB
YAML
# RUN: ld64.lld.darwinold -arch x86_64 %s %p/Inputs/interposing-section.yaml \
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# RUN: -dylib -o %t %p/Inputs/x86_64/libSystem.yaml
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# RUN: llvm-objdump --private-headers %t | FileCheck %s
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#
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# RUN: ld64.lld.darwinold -arch x86_64 %s -r -o %t1
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# RUN: llvm-objdump --private-headers %t1 | FileCheck %s
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#
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# Test that interposing section is preserved by linker.
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#
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--- !mach-o
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arch: x86_64
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file-type: MH_OBJECT
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flags: [ MH_SUBSECTIONS_VIA_SYMBOLS ]
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sections:
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- segment: __TEXT
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section: __text
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type: S_REGULAR
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attributes: [ S_ATTR_PURE_INSTRUCTIONS, S_ATTR_SOME_INSTRUCTIONS ]
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address: 0x0000000000000000
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content: [ 0x55, 0x48, 0x89, 0xE5, 0x31, 0xC0, 0x5D, 0xE9,
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0x00, 0x00, 0x00, 0x00 ]
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relocations:
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- offset: 0x00000008
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type: X86_64_RELOC_BRANCH
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length: 2
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pc-rel: true
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extern: true
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symbol: 2
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- segment: __DATA
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section: __interpose
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type: S_INTERPOSING
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attributes: [ ]
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alignment: 8
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address: 0x0000000000000010
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content: [ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ]
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relocations:
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- offset: 0x00000008
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type: X86_64_RELOC_UNSIGNED
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length: 3
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pc-rel: false
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extern: true
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symbol: 2
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- offset: 0x00000000
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type: X86_64_RELOC_UNSIGNED
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length: 3
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pc-rel: false
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extern: true
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symbol: 0
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local-symbols:
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- name: _my_open
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type: N_SECT
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sect: 1
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value: 0x0000000000000000
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- name: __interpose_open
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type: N_SECT
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sect: 2
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desc: [ N_NO_DEAD_STRIP ]
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value: 0x0000000000000010
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undefined-symbols:
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- name: _open
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type: N_UNDF
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scope: [ N_EXT ]
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value: 0x0000000000000000
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...
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# CHECK: sectname __interposing
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# CHECK: segname __DATA
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# CHECK: type S_INTERPOSING
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