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[yaml2obj] - Allow producing ELFDATANONE ELFs

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I need this to remove a binary from LLD test suite.
The patch also simplifies the code a bit.

Differential revision: https://reviews.llvm.org/D59082

llvm-svn: 355591
This commit is contained in:
George Rimar 2019-03-07 12:09:19 +00:00
parent cfd3255251
commit a5a0a0f049
3 changed files with 19 additions and 4 deletions
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5
llvm/lib/ObjectYAML/ELFYAML.cpp
View File

@ -232,8 +232,9 @@ void ScalarEnumerationTraits<ELFYAML::ELF_ELFCLASS>::enumeration(
void ScalarEnumerationTraits<ELFYAML::ELF_ELFDATA>::enumeration(
IO &IO, ELFYAML::ELF_ELFDATA &Value) {
#define ECase(X) IO.enumCase(Value, #X, ELF::X)
// Since the semantics of ELFDATANONE is "invalid", just don't accept it
// here.
// ELFDATANONE is an invalid data encoding, but we accept it because
// we want to be able to produce invalid binaries for the tests.
ECase(ELFDATANONE);
ECase(ELFDATA2LSB);
ECase(ELFDATA2MSB);
#undef ECase

15
llvm/test/tools/yaml2obj/elf-header-elfdatanone.yaml Normal file
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@ -0,0 +1,15 @@
## We have a YAML file describing an invalid data type.
## Check we are able to produce the invalid binary.
# RUN: yaml2obj %s -o %t.o
## Check that EI_DATA field is ELFDATANONE(0)
# RUN: od -b %t.o +5 | FileCheck %s
# CHECK: 0000005 000
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATANONE
Type: ET_REL
Machine: EM_X86_64

3
llvm/tools/yaml2obj/yaml2elf.cpp
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@ -207,8 +207,7 @@ void ELFState<ELFT>::initELFHeader(Elf_Ehdr &Header) {
Header.e_ident[EI_MAG2] = 'L';
Header.e_ident[EI_MAG3] = 'F';
Header.e_ident[EI_CLASS] = ELFT::Is64Bits ? ELFCLASS64 : ELFCLASS32;
bool IsLittleEndian = ELFT::TargetEndianness == support::little;
Header.e_ident[EI_DATA] = IsLittleEndian ? ELFDATA2LSB : ELFDATA2MSB;
Header.e_ident[EI_DATA] = Doc.Header.Data;
Header.e_ident[EI_VERSION] = EV_CURRENT;
Header.e_ident[EI_OSABI] = Doc.Header.OSABI;
Header.e_ident[EI_ABIVERSION] = Doc.Header.ABIVersion;