Implements low-level object file format specific output for COFF and

ELF with support for:

- File headers
- Section headers + data
- Relocations
- Symbols
- Unwind data (only COFF/Win64)

The output format follows a few rules:
- Values are almost always output one per line (as elf-dump/coff-dump already do). - Many values are translated to something readable (like enum names), with the raw value in parentheses.
- Hex numbers are output in uppercase, prefixed with "0x".
- Flags are sorted alphabetically.
- Lists and groups are always delimited.

Example output:
---------- snip ----------
Sections [
  Section {
    Index: 1
    Name: .text (5)
    Type: SHT_PROGBITS (0x1)
    Flags [ (0x6)
      SHF_ALLOC (0x2)
      SHF_EXECINSTR (0x4)
    ]
    Address: 0x0
    Offset: 0x40
    Size: 33
    Link: 0
    Info: 0
    AddressAlignment: 16
    EntrySize: 0
    Relocations [
      0x6 R_386_32 .rodata.str1.1 0x0
      0xB R_386_PC32 puts 0x0
      0x12 R_386_32 .rodata.str1.1 0x0
      0x17 R_386_PC32 puts 0x0
    ]
    SectionData (
      0000: 83EC04C7 04240000 0000E8FC FFFFFFC7  |.....$..........|
      0010: 04240600 0000E8FC FFFFFF31 C083C404  |.$.........1....|
      0020: C3                                   |.|
    )
  }
]
---------- snip ----------

Relocations and symbols can be output standalone or together with the section header as displayed in the example.
This feature set supports all tests in test/MC/COFF and test/MC/ELF (and I suspect all additional tests using elf-dump), making elf-dump and coff-dump deprecated.

Patch by Nico Rieck!

llvm-svn: 178679

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-readobj/Inputs/trivial.ll b/llvm/test/tools/llvm-readobj/Inputs/trivial.ll
new file mode 100644
index 00000000000..2cd7ec89e24
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/Inputs/trivial.ll
@@ -0,0 +1,19 @@
+; llc -mtriple=i386-pc-win32 trivial.ll -filetype=obj -o trivial-object-test.coff-i386
+; llc -mtriple=x86_64-pc-win32 trivial.ll -filetype=obj -o trivial-object-test.coff-x86-64
+; llc -mtriple=i386-linux-gnu trivial.ll -filetype=obj -o trivial-object-test.elf-i386 -relocation-model=pic
+; llc -mtriple=x86_64-linux-gnu trivial.ll -filetype=obj -o trivial-object-test.elf-x86-64 -relocation-model=pic
+; llc -mtriple=i386-apple-darwin10 trivial.ll -filetype=obj -o trivial-object-test.macho-i386 -relocation-model=pic
+; llc -mtriple=x86_64-apple-darwin10 trivial.ll -filetype=obj -o trivial-object-test.macho-x86-64 -relocation-model=pic
+
+@.str = private unnamed_addr constant [13 x i8] c"Hello World\0A\00", align 1
+
+define i32 @main() nounwind {
+entry:
+  %call = tail call i32 @puts(i8* getelementptr inbounds ([13 x i8]* @.str, i32 0, i32 0)) nounwind
+  tail call void bitcast (void (...)* @SomeOtherFunction to void ()*)() nounwind
+  ret i32 0
+}
+
+declare i32 @puts(i8* nocapture) nounwind
+
+declare void @SomeOtherFunction(...)