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888c5073d1
ubsan caught an issue I made where I was converting a null pointer to a reference. elf utils implements a particularly extreme form of stripping that I'd like to support. eu-strip has an option called "strip-sections" that removes all section headers and leaves only program headers and the segment data. I have implemented this option partly as a test but mainly because in Fuchsia we would like to use this option to minimize the size of our executables. The other strip options that are on my list include --strip-all and --strip-debug. This is a preliminary implementation that I'd like to start using in Fuchsia builds if possible. This change implements such a stripping option for llvm-objcopy Differential Revision: https://reviews.llvm.org/D38335 llvm-svn: 315484
67 lines
1.9 KiB
Plaintext
67 lines
1.9 KiB
Plaintext
# RUN: yaml2obj %s > %t
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# RUN: llvm-objcopy --strip-sections %t %t2
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# RUN: llvm-readobj -file-headers -program-headers %t2 | FileCheck %s
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# RUN: od -t x1 -j 4096 %t2 | FileCheck %s --check-prefix=DATA
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!ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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AddressAlign: 0x0000000000001000
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Content: "DEADBEEF"
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ProgramHeaders:
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- Type: PT_LOAD
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Flags: [ PF_X, PF_R ]
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Sections:
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- Section: .text
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#DATA: 0010000 de ad be ef
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#CHECK: ElfHeader {
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#CHECK-NEXT: Ident {
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#CHECK-NEXT: Magic: (7F 45 4C 46)
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#CHECK-NEXT: Class: 64-bit (0x2)
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#CHECK-NEXT: DataEncoding: LittleEndian (0x1)
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#CHECK-NEXT: FileVersion: 1
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#CHECK-NEXT: OS/ABI: SystemV (0x0)
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#CHECK-NEXT: ABIVersion: 0
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#CHECK-NEXT: Unused: (00 00 00 00 00 00 00)
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#CHECK-NEXT: }
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#CHECK-NEXT: Type: Executable (0x2)
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#CHECK-NEXT: Machine: EM_X86_64 (0x3E)
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#CHECK-NEXT: Version: 1
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#CHECK-NEXT: Entry: 0x0
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#CHECK-NEXT: ProgramHeaderOffset: 0x40
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#CHECK-NEXT: SectionHeaderOffset: 0x0
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#CHECK-NEXT: Flags [ (0x0)
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#CHECK-NEXT: ]
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#CHECK-NEXT: HeaderSize: 64
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#CHECK-NEXT: ProgramHeaderEntrySize: 56
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#CHECK-NEXT: ProgramHeaderCount: 1
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#CHECK-NEXT: SectionHeaderEntrySize: 64
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#CHECK-NEXT: SectionHeaderCount: 0
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#CHECK-NEXT: StringTableSectionIndex: 0
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#CHECK-NEXT: }
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#CHECK: ProgramHeaders [
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#CHECK-NEXT: ProgramHeader {
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#CHECK-NEXT: Type: PT_LOAD (0x1)
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#CHECK-NEXT: Offset: 0x1000
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#CHECK-NEXT: VirtualAddress: 0x0
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#CHECK-NEXT: PhysicalAddress: 0x0
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#CHECK-NEXT: FileSize: 4
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#CHECK-NEXT: MemSize: 4
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#CHECK-NEXT: Flags [ (0x5)
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#CHECK-NEXT: PF_R (0x4)
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#CHECK-NEXT: PF_X (0x1)
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#CHECK-NEXT: ]
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#CHECK-NEXT: Alignment: 4096
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#CHECK-NEXT: }
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#CHECK-NEXT:]
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