21921375cc
Sometimes compilers emit data into code sections (e.g. constant pools or jump tables). These runs of data can throw off disassemblers. The solution in mach-o is that ranges of data-in-code are encoded into a table pointed to by the LC_DATA_IN_CODE load command. The way the data-in-code information is encoded into lld's Atom model is that that start and end of each data run is marked with a Reference whose offset is the start/end of the data run. For arm, the switch back to code also marks whether it is thumb or arm code. llvm-svn: 213901
78 lines
1.8 KiB
YAML
78 lines
1.8 KiB
YAML
# RUN: lld -flavor darwin -arch i386 -r -print_atoms %s -o %t | FileCheck %s \
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# RUN: && lld -flavor darwin -arch i386 -r -print_atoms %t -o %t2 | FileCheck %s
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#
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# Test parsing LC_DATA_IN_CODE
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#
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#
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--- !mach-o
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arch: x86
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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: [ 0x90, 0x90, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00,
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0x00, 0x00, 0x90, 0x90, 0x90, 0x90, 0x03, 0x00,
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0x00, 0x00 ]
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local-symbols:
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- name: _func1
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type: N_SECT
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sect: 1
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value: 0x0000000000000000
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- name: _func2
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type: N_SECT
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sect: 1
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value: 0x000000000000000B
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dataInCode:
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- offset: 0x00000002
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length: 0x0008
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kind: DICE_KIND_JUMP_TABLE32
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- offset: 0x0000000E
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length: 0x0004
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kind: DICE_KIND_JUMP_TABLE32
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...
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# CHECK: defined-atoms:
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# CHECK: - name: _func1
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# CHECK: references:
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# CHECK: - kind: modeData
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# CHECK: offset: 2
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# CHECK: addend: 4
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# CHECK: - kind: modeCode
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# CHECK: offset: 10
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# CHECK: - name: _func2
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# CHECK: references:
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# CHECK: - kind: modeData
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# CHECK: offset: 3
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# CHECK: addend: 4
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# CHECK-NOT: - kind: modeData
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#
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#_func1:
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# nop
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# nop
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# .data_region jt32
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# .long 1
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# .long 2
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# .end_data_region
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# nop
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#
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#
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# _func2:
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# nop
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# nop
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# nop
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# .data_region jt32
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# .long 3
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# .end_data_region
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#
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