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