2020-10-08 05:50:42 +08:00
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## Stub dylibs differ from "real" dylibs in that they lack any content in their
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## sections. What they do have are export tries and symbol tables, which means
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## we can still link against them. I (jezng) am unclear how to properly create
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## these stub dylibs; XCode 11.3's `lipo` is able to create stub dylibs, but
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## those lack LC_ID_DYLIB load commands and are considered invalid by most
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## tooling. Newer versions of `lipo` aren't able to create stub dylibs at all.
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## However, recent SDKs in XCode still come with valid stub dylibs, so it still
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## seems worthwhile to support them. The YAML in this test was generated by
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## taking a non-stub dylib and editing the appropriate fields.
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# REQUIRES: x86
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2021-05-09 02:42:15 +08:00
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# RUN: rm -rf %t; split-file %s %t
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2020-10-08 05:50:42 +08:00
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/test.s -o %t/test.o
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2020-11-12 21:23:14 +08:00
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# RUN: yaml2obj %t/fat.dylib.yaml > %t/fat.dylib
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# RUN: %lld -lSystem %t/test.o %t/fat.dylib -o %t/test
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2020-10-08 05:50:42 +08:00
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# RUN: llvm-objdump --macho --lazy-bind %t/test | FileCheck %s
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2021-01-03 02:31:55 +08:00
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# CHECK: __DATA __la_symbol_ptr 0x100002000 foo _foo
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2020-10-08 05:50:42 +08:00
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#--- test.s
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.globl _main
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_main:
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callq _foo
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ret
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#--- fat.dylib.yaml
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--- !fat-mach-o
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FatHeader:
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magic: 0xCAFEBABE
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nfat_arch: 1
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FatArchs:
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- cputype: 0x01000007
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cpusubtype: 0x00000003
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offset: 0x0000000000001000
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size: 16432
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align: 12
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Slices:
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- !mach-o
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FileHeader:
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magic: 0xFEEDFACF
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cputype: 0x01000007
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cpusubtype: 0x00000003
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filetype: 0x00000009
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ncmds: 5
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sizeofcmds: 568
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flags: 0x00100085
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reserved: 0x00000000
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LoadCommands:
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- cmd: LC_SEGMENT_64
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cmdsize: 232
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segname: __TEXT
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vmaddr: 0
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vmsize: 16384
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fileoff: 0
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filesize: 16384
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maxprot: 5
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initprot: 5
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nsects: 1
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flags: 0
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Sections:
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- sectname: __text
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segname: __TEXT
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addr: 0x0000000000000000
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size: 0
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offset: 0x00003FB7
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align: 0
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reloff: 0x00000000
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nreloc: 0
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flags: 0x80000400
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reserved1: 0x00000000
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reserved2: 0x00000000
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reserved3: 0x00000000
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content: ''
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- cmd: LC_SEGMENT_64
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cmdsize: 72
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segname: __LINKEDIT
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vmaddr: 16384
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vmsize: 16384
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fileoff: 16384
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filesize: 48
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maxprot: 1
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initprot: 1
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nsects: 0
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flags: 0
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- cmd: LC_ID_DYLIB
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cmdsize: 40
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dylib:
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name: 24
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timestamp: 1
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current_version: 0
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compatibility_version: 0
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2021-07-27 00:04:51 +08:00
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Content: foo.dylib
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2020-10-08 05:50:42 +08:00
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ZeroPadBytes: 7
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- cmd: LC_DYLD_INFO_ONLY
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cmdsize: 48
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rebase_off: 0
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rebase_size: 0
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bind_off: 0
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bind_size: 0
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weak_bind_off: 0
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weak_bind_size: 0
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lazy_bind_off: 0
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lazy_bind_size: 0
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export_off: 16384
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export_size: 16
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- cmd: LC_SYMTAB
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cmdsize: 24
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symoff: 16408
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nsyms: 1
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stroff: 16424
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strsize: 8
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LinkEditData:
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ExportTrie:
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TerminalSize: 0
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NodeOffset: 0
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Name: ''
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Flags: 0x0000000000000000
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Address: 0x0000000000000000
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Other: 0x0000000000000000
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ImportName: ''
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Children:
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- TerminalSize: 3
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NodeOffset: 8
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Name: _foo
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Flags: 0x0000000000000000
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Address: 0x0000000000003FB7
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Other: 0x0000000000000000
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ImportName: ''
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NameList:
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- n_strx: 2
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n_type: 0x0F
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n_sect: 1
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n_desc: 0
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n_value: 16311
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StringTable:
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- ' '
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- _foo
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- ''
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...
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