eb96c8c105
The main change is to permit the disassembler class to process/store multiple (discontinuous) ranges of addresses. The result is not ambiguous because each instruction knows its size (in addition to its address), so we can check for discontinuity by looking at whether the next instruction begins where the previous ends. This patch doesn't handle the "disassemble" CLI command, which uses a more elaborate mechanism for disassembling and printing instructions.
194 lines
7.8 KiB
ArmAsm
194 lines
7.8 KiB
ArmAsm
# REQUIRES: x86
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# RUN: split-file %s %t
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# RUN: llvm-mc -triple x86_64-pc-linux -filetype=obj %t/input.s -o %t/input.o
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# RUN: %lldb %t/input.o -o "command script import %t/script.py" -o exit | FileCheck %s
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# CHECK: Found 1 function(s).
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# CHECK: foo: [input.o[0x0-0xe), input.o[0x14-0x1c)]
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# CHECK-NEXT: input.o[0x0]: cmpl $0x0, %edi
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# CHECK-NEXT: input.o[0x3]: je 0x14
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# CHECK-NEXT: input.o[0x5]: jmp 0x7
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# CHECK-NEXT: input.o[0x7]: callq 0xe
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# CHECK-NEXT: input.o[0xc]: jmp 0x1b
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# CHECK-EMPTY:
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# CHECK-NEXT: input.o[0x14]: callq 0x19
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# CHECK-NEXT: input.o[0x19]: jmp 0x1b
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# CHECK-NEXT: input.o[0x1b]: retq
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#--- script.py
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import lldb
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def __lldb_init_module(debugger, internal_dict):
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target = debugger.GetSelectedTarget()
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sym_ctxs = target.FindFunctions("foo")
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print(f"Found {len(sym_ctxs)} function(s).")
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for ctx in sym_ctxs:
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fn = ctx.function
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print(f"{fn.name}: {fn.GetRanges()}")
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print(fn.GetInstructions(target))
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#--- input.s
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# An example of a function which has been split into two parts. Roughly
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# corresponds to this C code.
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# int baz();
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# int bar() { return 47; }
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# int foo(int flag) { return flag ? bar() : baz(); }
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# The function bar has been placed "in the middle" of foo.
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.text
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.type foo,@function
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foo:
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.cfi_startproc
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cmpl $0, %edi
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je foo.__part.2
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jmp foo.__part.1
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.cfi_endproc
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.Lfoo_end:
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.size foo, .Lfoo_end-foo
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foo.__part.1:
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.cfi_startproc
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callq bar
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jmp foo.__part.3
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.Lfoo.__part.1_end:
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.size foo.__part.1, .Lfoo.__part.1_end-foo.__part.1
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.cfi_endproc
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bar:
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.cfi_startproc
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movl $47, %eax
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retq
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.cfi_endproc
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.Lbar_end:
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.size bar, .Lbar_end-bar
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foo.__part.2:
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.cfi_startproc
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callq baz
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jmp foo.__part.3
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.Lfoo.__part.2_end:
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.size foo.__part.2, .Lfoo.__part.2_end-foo.__part.2
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.cfi_endproc
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foo.__part.3:
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.cfi_startproc
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retq
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.Lfoo.__part.3_end:
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.size foo.__part.3, .Lfoo.__part.3_end-foo.__part.3
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.cfi_endproc
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.section .debug_abbrev,"",@progbits
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.byte 1 # Abbreviation Code
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.byte 17 # DW_TAG_compile_unit
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.byte 1 # DW_CHILDREN_yes
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.byte 37 # DW_AT_producer
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.byte 8 # DW_FORM_string
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.byte 19 # DW_AT_language
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.byte 5 # DW_FORM_data2
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.byte 17 # DW_AT_low_pc
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.byte 1 # DW_FORM_addr
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.byte 85 # DW_AT_ranges
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.byte 35 # DW_FORM_rnglistx
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.byte 116 # DW_AT_rnglists_base
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.byte 23 # DW_FORM_sec_offset
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 2 # Abbreviation Code
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.byte 46 # DW_TAG_subprogram
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.byte 0 # DW_CHILDREN_no
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.byte 17 # DW_AT_low_pc
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.byte 1 # DW_FORM_addr
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.byte 18 # DW_AT_high_pc
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.byte 1 # DW_FORM_addr
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.byte 3 # DW_AT_name
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.byte 8 # DW_FORM_string
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 3 # Abbreviation Code
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.byte 46 # DW_TAG_subprogram
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.byte 0 # DW_CHILDREN_no
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.byte 85 # DW_AT_ranges
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.byte 35 # DW_FORM_rnglistx
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.byte 64 # DW_AT_frame_base
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.byte 24 # DW_FORM_exprloc
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.byte 3 # DW_AT_name
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.byte 8 # DW_FORM_string
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 0 # EOM(3)
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.section .debug_info,"",@progbits
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.Lcu_begin0:
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.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
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.Ldebug_info_start0:
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.short 5 # DWARF version number
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.byte 1 # DWARF Unit Type
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.byte 8 # Address Size (in bytes)
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.long .debug_abbrev # Offset Into Abbrev. Section
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.byte 1 # Abbrev [1] DW_TAG_compile_unit
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.asciz "Hand-written DWARF" # DW_AT_producer
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.short 29 # DW_AT_language
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.quad 0 # DW_AT_low_pc
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.byte 1 # DW_AT_ranges
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.long .Lrnglists_table_base0 # DW_AT_rnglists_base
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.byte 2 # Abbrev [2] DW_TAG_subprogram
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.quad bar # DW_AT_low_pc
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.quad .Lbar_end # DW_AT_high_pc
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.asciz "bar" # DW_AT_name
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.byte 3 # Abbrev [3] DW_TAG_subprogram
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.byte 0 # DW_AT_ranges
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.byte 1 # DW_AT_frame_base
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.byte 86
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.asciz "foo" # DW_AT_name
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.byte 0 # End Of Children Mark
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.Ldebug_info_end0:
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.section .debug_rnglists,"",@progbits
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.long .Ldebug_list_header_end0-.Ldebug_list_header_start0 # Length
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.Ldebug_list_header_start0:
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.short 5 # Version
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.byte 8 # Address size
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.byte 0 # Segment selector size
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.long 2 # Offset entry count
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.Lrnglists_table_base0:
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.long .Ldebug_ranges0-.Lrnglists_table_base0
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.long .Ldebug_ranges1-.Lrnglists_table_base0
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.Ldebug_ranges0:
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.byte 6 # DW_RLE_start_end
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.quad foo
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.quad .Lfoo_end
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.byte 6 # DW_RLE_start_end
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.quad foo.__part.1
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.quad .Lfoo.__part.1_end
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.byte 6 # DW_RLE_start_end
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.quad foo.__part.2
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.quad .Lfoo.__part.2_end
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.byte 6 # DW_RLE_start_end
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.quad foo.__part.3
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.quad .Lfoo.__part.3_end
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.byte 0 # DW_RLE_end_of_list
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.Ldebug_ranges1:
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.byte 6 # DW_RLE_start_end
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.quad bar
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.quad .Lbar_end
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.byte 6 # DW_RLE_start_end
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.quad foo.__part.1
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.quad .Lfoo.__part.1_end
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.byte 6 # DW_RLE_start_end
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.quad foo.__part.2
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.quad .Lfoo.__part.2_end
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.byte 6 # DW_RLE_start_end
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.quad foo.__part.3
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.quad .Lfoo.__part.3_end
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.byte 6 # DW_RLE_start_end
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.quad foo
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.quad .Lfoo_end
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.byte 0 # DW_RLE_end_of_list
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.Ldebug_list_header_end0:
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.section ".note.GNU-stack","",@progbits
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