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[yaml2obj][ELF] Add an optional Size field to the YAML section declaration.

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208995 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Atanasyan
2014-05-16 16:01:00 +00:00
parent b32cee560d
commit 19ab8f850f
6 changed files with 70 additions and 2 deletions
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2
include/llvm/Object/ELFYAML.h
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@@ -83,6 +83,7 @@ struct Section {
};
struct RawContentSection : Section {
object::yaml::BinaryRef Content;
llvm::yaml::Hex64 Size;
RawContentSection() : Section(SectionKind::RawContent) {}
static bool classof(const Section *S) {
return S->Kind == SectionKind::RawContent;
@@ -193,6 +194,7 @@ template <> struct MappingTraits<ELFYAML::Relocation> {
template <>
struct MappingTraits<std::unique_ptr<ELFYAML::Section>> {
static void mapping(IO &IO, std::unique_ptr<ELFYAML::Section> &Section);
static StringRef validate(IO &io, std::unique_ptr<ELFYAML::Section> &Section);
};
template <>