[obj2yaml][yaml2obj] - Add support of parsing/dumping of the .gnu.version_r section.

The section is described here:
https://refspecs.linuxfoundation.org/LSB_1.3.0/gLSB/gLSB/symverrqmts.html

Patch just teaches obj2yaml/yaml2obj to dump and parse such sections.

We did the finalization of string tables very late,
and I had to move the logic to make it a bit earlier.
That was needed in this patch since .gnu.version_r adds strings to .dynstr.
This might also be useful for implementing other special sections.

Everything else changed in this patch seems to be straightforward.

Differential revision: https://reviews.llvm.org/D58119

llvm-svn: 354328

1 files changed, 35 insertions, 0 deletions

diff --git a/llvm/include/llvm/ObjectYAML/ELFYAML.h b/llvm/include/llvm/ObjectYAML/ELFYAML.h
index e194e59a485..0e8206fc36e 100644
--- a/llvm/include/llvm/ObjectYAML/ELFYAML.h
+++ b/llvm/include/llvm/ObjectYAML/ELFYAML.h
@@ -121,6 +121,7 @@ struct Section {
     RawContent,
     Relocation,
     NoBits,
+    Verneed,
     MipsABIFlags
   };
   SectionKind Kind;
@@ -167,6 +168,30 @@ struct NoBitsSection : Section {
   }
 };
 
+struct VernauxEntry {
+  uint32_t Hash;
+  uint16_t Flags;
+  uint16_t Other;
+  StringRef Name;
+};
+
+struct VerneedEntry {
+  uint16_t Version;
+  StringRef File;
+  std::vector<VernauxEntry> AuxV;
+};
+
+struct VerneedSection : Section {
+  std::vector<VerneedEntry> VerneedV;
+  llvm::yaml::Hex64 Info;
+
+  VerneedSection() : Section(SectionKind::Verneed) {}
+
+  static bool classof(const Section *S) {
+    return S->Kind == SectionKind::Verneed;
+  }
+};
+
 struct Group : Section {
   // Members of a group contain a flag and a list of section indices
   // that are part of the group.
@@ -238,6 +263,8 @@ LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::DynamicEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::ProgramHeader)
 LLVM_YAML_IS_SEQUENCE_VECTOR(std::unique_ptr<llvm::ELFYAML::Section>)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::Symbol)
+LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::VernauxEntry)
+LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::VerneedEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::Relocation)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::SectionOrType)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::SectionName)
@@ -381,6 +408,14 @@ template <> struct MappingTraits<ELFYAML::DynamicEntry> {
   static void mapping(IO &IO, ELFYAML::DynamicEntry &Rel);
 };
 
+template <> struct MappingTraits<ELFYAML::VerneedEntry> {
+  static void mapping(IO &IO, ELFYAML::VerneedEntry &E);
+};
+
+template <> struct MappingTraits<ELFYAML::VernauxEntry> {
+  static void mapping(IO &IO, ELFYAML::VernauxEntry &E);
+};
+
 template <> struct MappingTraits<ELFYAML::Relocation> {
   static void mapping(IO &IO, ELFYAML::Relocation &Rel);
 };