Teach llvm-objdump with the -macho parser how to use the data in code table

from the LC_DATA_IN_CODE load command.  And when disassembling print
the data in code formatted for the kind of data it and not disassemble those
bytes.

I added the format specific functionality to the derived class MachOObjectFile
since these tables only appears in Mach-O object files. This is my first
attempt to modify the libObject stuff so if folks have better suggestions
how to fit this in or suggestions on the implementation please let me know.

rdar://11791371


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183424 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 88 insertions, 0 deletions

diff --git a/include/llvm/Object/MachO.h b/include/llvm/Object/MachO.h
index f3ba8ef..1b9faaa 100644
--- a/include/llvm/Object/MachO.h
+++ b/include/llvm/Object/MachO.h
@@ -25,6 +25,31 @@
 namespace llvm {
 namespace object {
 
+/// DiceRef - This is a value type class that represents a single
+/// data in code entry in the table in a Mach-O object file.
+class DiceRef {
+  DataRefImpl DicePimpl;
+  const ObjectFile *OwningObject;
+
+public:
+  DiceRef() : OwningObject(NULL) { }
+
+  DiceRef(DataRefImpl DiceP, const ObjectFile *Owner);
+
+  bool operator==(const DiceRef &Other) const;
+  bool operator<(const DiceRef &Other) const;
+
+  error_code getNext(DiceRef &Result) const;
+
+  error_code getOffset(uint32_t &Result) const;
+  error_code getLength(uint16_t &Result) const;
+  error_code getKind(uint16_t &Result) const;
+
+  DataRefImpl getRawDataRefImpl() const;
+  const ObjectFile *getObjectFile() const;
+};
+typedef content_iterator<DiceRef> dice_iterator;
+
 class MachOObjectFile : public ObjectFile {
 public:
   struct LoadCommandInfo {
@@ -108,6 +133,9 @@ public:
   relocation_iterator getSectionRelBegin(unsigned Index) const;
   relocation_iterator getSectionRelEnd(unsigned Index) const;
 
+  dice_iterator begin_dices() const;
+  dice_iterator end_dices() const;
+
   // In a MachO file, sections have a segment name. This is used in the .o
   // files. They have a single segment, but this field specifies which segment
   // a section should be put in in the final object.
@@ -152,6 +180,7 @@ public:
   getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const;
 
   macho::RelocationEntry getRelocation(DataRefImpl Rel) const;
+  macho::DataInCodeTableEntry getDice(DataRefImpl Rel) const;
   macho::Header getHeader() const;
   macho::Header64Ext getHeader64Ext() const;
   macho::IndirectSymbolTableEntry
@@ -161,6 +190,7 @@ public:
                                                       unsigned Index) const;
   macho::SymtabLoadCommand getSymtabLoadCommand() const;
   macho::DysymtabLoadCommand getDysymtabLoadCommand() const;
+  macho::LinkeditDataLoadCommand getDataInCodeLoadCommand() const;
 
   StringRef getStringTableData() const;
   bool is64Bit() const;
@@ -175,8 +205,66 @@ private:
   SectionList Sections;
   const char *SymtabLoadCmd;
   const char *DysymtabLoadCmd;
+  const char *DataInCodeLoadCmd;
 };
 
+/// DiceRef
+inline DiceRef::DiceRef(DataRefImpl DiceP, const ObjectFile *Owner)
+  : DicePimpl(DiceP) , OwningObject(Owner) {}
+
+inline bool DiceRef::operator==(const DiceRef &Other) const {
+  return DicePimpl == Other.DicePimpl;
+}
+
+inline bool DiceRef::operator<(const DiceRef &Other) const {
+  return DicePimpl < Other.DicePimpl;
+}
+
+inline error_code DiceRef::getNext(DiceRef &Result) const {
+  DataRefImpl Rel = DicePimpl;
+  const macho::DataInCodeTableEntry *P =
+    reinterpret_cast<const macho::DataInCodeTableEntry *>(Rel.p);
+  Rel.p = reinterpret_cast<uintptr_t>(P + 1);
+  Result = DiceRef(Rel, OwningObject);
+  return object_error::success;
+}
+
+// Since a Mach-O data in code reference, a DiceRef, can only be created when
+// the OwningObject ObjectFile is a MachOObjectFile a static_cast<> is used for
+// the methods that get the values of the fields of the reference.
+
+inline error_code DiceRef::getOffset(uint32_t &Result) const {
+  const MachOObjectFile *MachOOF =
+    static_cast<const MachOObjectFile *>(OwningObject);
+  macho::DataInCodeTableEntry Dice = MachOOF->getDice(DicePimpl);
+  Result = Dice.Offset;
+  return object_error::success;
+}
+
+inline error_code DiceRef::getLength(uint16_t &Result) const {
+  const MachOObjectFile *MachOOF =
+    static_cast<const MachOObjectFile *>(OwningObject);
+  macho::DataInCodeTableEntry Dice = MachOOF->getDice(DicePimpl);
+  Result = Dice.Length;
+  return object_error::success;
+}
+
+inline error_code DiceRef::getKind(uint16_t &Result) const {
+  const MachOObjectFile *MachOOF =
+    static_cast<const MachOObjectFile *>(OwningObject);
+  macho::DataInCodeTableEntry Dice = MachOOF->getDice(DicePimpl);
+  Result = Dice.Kind;
+  return object_error::success;
+}
+
+inline DataRefImpl DiceRef::getRawDataRefImpl() const {
+  return DicePimpl;
+}
+
+inline const ObjectFile *DiceRef::getObjectFile() const {
+  return OwningObject;
+}
+
 }
 }