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[yaml2obj] Remove --format option in favor of YAML tags Summary: Our YAML library's handling of tags isn't perfect, but it is good enough to get rid of the need for the --format argument to yaml2obj. This patch does exactly that. Instead of requiring --format, it infers the format based on the tags found in the object file. The supported tags are: !ELF !COFF !mach-o !fat-mach-o I have a corresponding patch that is quite large that fixes up all the in-tree test cases. Reviewers: rafael, Bigcheese, compnerd, silvas Subscribers: compnerd, llvm-commits Differential Revision: http://reviews.llvm.org/D21711 llvm-svn: 273915
2016-06-28 03:53:53 +08:00
# RUN: not yaml2obj -o %t %s 2>&1 | FileCheck %s
[yaml2obj][ELF] Add an optional `Size` field to the YAML section declaration. Now the only method to configure ELF section's content and size is to assign a hexadecimal string to the `Content` field. Unfortunately this way is completely useless when you need to declare a really large section. To solve this problem this patch adds one more optional field `Size` to the `RawContentSection` structure. When yaml2obj generates an ELF file it uses the following algorithm: 1. If both `Content` and `Size` fields are missed create an empty section. 2. If only `Content` field is missed take section length from the `Size` field and fill the section by zero. 3. If only `Size` field is missed create a section using data from the `Content` field. 4. If both `Content` and `Size` fields are provided validate that the `Size` value is not less than size of `Content` data. Than take section length from the `Size`, fill beginning of the section by `Content` and the rest by zero. Examples -------- * Create a section 0x10000 bytes long filled by zero Name: .data Type: SHT_PROGBITS Flags: [ SHF_ALLOC ] Size: 0x10000 * Create a section 0x10000 bytes long starting from 'CA' 'FE' 'BA' 'BE' Name: .data Type: SHT_PROGBITS Flags: [ SHF_ALLOC ] Content: CAFEBABE Size: 0x10000 The patch reviewed by Michael Spencer. llvm-svn: 208995
2014-05-17 00:01:00 +08:00
!ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Content: EBFE
AddressAlign: 2
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
Content: 0000000000000000
Size: 2
# CHECK: YAML:17:5: error: Section size must be greater or equal to the content size
# CHECK-NEXT: - Name: .data
# CHECK-NEXT: ^
# CHECK-NEXT: yaml2obj: Failed to parse YAML file!