ObjectFile: Add a method to check whether a section contains a symbol.

- No ELF or COFF implementation yet, I don't have a way to test that.
  Should be straightforward to add though.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135288 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/COFF.h

@@ -96,6 +96,8 @@ protected:
   virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
   virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
   virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
+  virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
+                                           bool &Result) const;
 
 public:
   COFFObjectFile(MemoryBuffer *Object, error_code &ec);

include/llvm/Object/ObjectFile.h

@@ -58,6 +58,7 @@ public:
 /// SymbolRef - This is a value type class that represents a single symbol in
 /// the list of symbols in the object file.
 class SymbolRef {
+  friend class SectionRef;
   DataRefImpl SymbolPimpl;
   const ObjectFile *OwningObject;
 
@@ -88,6 +89,7 @@ public:
 /// SectionRef - This is a value type class that represents a single section in
 /// the list of sections in the object file.
 class SectionRef {
+  friend class SymbolRef;
   DataRefImpl SectionPimpl;
   const ObjectFile *OwningObject;
 
@@ -109,6 +111,8 @@ public:
 
   // FIXME: Move to the normalization layer when it's created.
   error_code isText(bool &Result) const;
+
+  error_code containsSymbol(SymbolRef S, bool &Result) const;
 };
 
 const uint64_t UnknownAddressOrSize = ~0ULL;
@@ -152,6 +156,8 @@ protected:
   virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const = 0;
   virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res)const=0;
   virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const = 0;
+  virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
+                                           bool &Result) const = 0;
 
 
 public:
@@ -287,6 +293,11 @@ inline error_code SectionRef::isText(bool &Result) const {
   return OwningObject->isSectionText(SectionPimpl, Result);
 }
 
+inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
+  return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
+                                             Result);
+}
+
 } // end namespace object
 } // end namespace llvm
 

lib/Object/COFFObjectFile.cpp

@@ -293,6 +293,14 @@ error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
   return object_error::success;
 }
 
+error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
+                                                 DataRefImpl Symb,
+                                                 bool &Result) const {
+  // FIXME: Unimplemented.
+  Result = false;
+  return object_error::success;
+}
+
 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
   : ObjectFile(Binary::isCOFF, Object, ec) {
   // Check that we at least have enough room for a header.

lib/Object/ELFObjectFile.cpp

@@ -235,6 +235,8 @@ protected:
   virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
   virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
   virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
+  virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
+                                           bool &Result) const;
 
 public:
   ELFObjectFile(MemoryBuffer *Object, error_code &ec);
@@ -495,6 +497,16 @@ error_code ELFObjectFile<target_endianness, is64Bits>
   return object_error::success;
 }
 
+template<support::endianness target_endianness, bool is64Bits>
+error_code ELFObjectFile<target_endianness, is64Bits>
+                          ::sectionContainsSymbol(DataRefImpl Sec,
+                                                  DataRefImpl Symb,
+                                                  bool &Result) const {
+  // FIXME: Unimplemented.
+  Result = false;
+  return object_error::success;
+}
+
 template<support::endianness target_endianness, bool is64Bits>
 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
                                                           , error_code &ec)

lib/Object/MachOObjectFile.cpp

@@ -60,6 +60,8 @@ protected:
   virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
   virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
   virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
+  virtual error_code sectionContainsSymbol(DataRefImpl DRI, DataRefImpl S,
+                                           bool &Result) const;
 
 private:
   MachOObject *MachOObj;
@@ -383,6 +385,21 @@ error_code MachOObjectFile::isSectionText(DataRefImpl DRI,
   return object_error::success;
 }
 
+error_code MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
+                                                  DataRefImpl Symb,
+                                                  bool &Result) const {
+  if (MachOObj->is64Bit()) {
+    InMemoryStruct<macho::Symbol64TableEntry> Entry;
+    getSymbol64TableEntry(Symb, Entry);
+    Result = Entry->SectionIndex == 1 + Sec.d.a + Sec.d.b;
+  } else {
+    InMemoryStruct<macho::SymbolTableEntry> Entry;
+    getSymbolTableEntry(Symb, Entry);
+    Result = Entry->SectionIndex == 1 + Sec.d.a + Sec.d.b;
+  }
+  return object_error::success;
+}
+
 ObjectFile::section_iterator MachOObjectFile::begin_sections() const {
   DataRefImpl DRI;
   DRI.d.a = DRI.d.b = 0;