Change relocation API to be per section.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141376 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/ObjectFile.h

@@ -27,12 +27,51 @@ namespace object {
 class ObjectFile;
 
 union DataRefImpl {
+  struct {
+    // ELF needs this for relocations. This entire union should probably be a
+    // char[max(8, sizeof(uintptr_t))] and require the impl to cast.
+    uint16_t a, b;
+    uint32_t c;
+  } w;
   struct {
     uint32_t a, b;
   } d;
   uintptr_t p;
 };
 
+template<class content_type>
+class content_iterator {
+  content_type Current;
+public:
+  content_iterator(content_type symb)
+    : Current(symb) {}
+
+  const content_type* operator->() const {
+    return &Current;
+  }
+
+  const content_type &operator*() const {
+    return Current;
+  }
+
+  bool operator==(const content_iterator &other) const {
+    return Current == other.Current;
+  }
+
+  bool operator!=(const content_iterator &other) const {
+    return !(*this == other);
+  }
+
+  content_iterator& increment(error_code &err) {
+    content_type next;
+    if (error_code ec = Current.getNext(next))
+      err = ec;
+    else
+      Current = next;
+    return *this;
+  }
+};
+
 static bool operator ==(const DataRefImpl &a, const DataRefImpl &b) {
   // Check bitwise identical. This is the only legal way to compare a union w/o
   // knowing which member is in use.
@@ -82,6 +121,7 @@ public:
   /// such as library functions
   error_code isGlobal(bool &Result) const;
 };
+typedef content_iterator<SymbolRef> symbol_iterator;
 
 /// RelocationRef - This is a value type class that represents a single
 /// relocation in the list of relocations in the object file.
@@ -103,8 +143,20 @@ public:
   error_code getAddress(uint64_t &Result) const;
   error_code getSymbol(SymbolRef &Result) const;
   error_code getType(uint32_t &Result) const;
+
+  /// @brief Get a string that represents the type of this relocation.
+  ///
+  /// This is for display purposes only.
+  error_code getTypeName(SmallVectorImpl<char> &Result) const;
   error_code getAdditionalInfo(int64_t &Result) const;
+
+  /// @brief Get a string that represents the calculation of the value of this
+  ///        relocation.
+  ///
+  /// This is for display purposes only.
+  error_code getValueString(SmallVectorImpl<char> &Result) const;
 };
+typedef content_iterator<RelocationRef> relocation_iterator;
 
 /// SectionRef - This is a value type class that represents a single section in
 /// the list of sections in the object file.
@@ -135,7 +187,11 @@ public:
   error_code isBSS(bool &Result) const;
 
   error_code containsSymbol(SymbolRef S, bool &Result) const;
+
+  relocation_iterator begin_relocations() const;
+  relocation_iterator end_relocations() const;
 };
+typedef content_iterator<SectionRef> section_iterator;
 
 const uint64_t UnknownAddressOrSize = ~0ULL;
 
@@ -185,6 +241,8 @@ protected:
   virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const = 0;
   virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
                                            bool &Result) const = 0;
+  virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
+  virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const = 0;
 
 
   // Same as above for RelocationRef.
@@ -197,46 +255,14 @@ protected:
                                          SymbolRef &Res) const = 0;
   virtual error_code getRelocationType(DataRefImpl Rel,
                                        uint32_t &Res) const = 0;
+  virtual error_code getRelocationTypeName(DataRefImpl Rel,
+                                       SmallVectorImpl<char> &Result) const = 0;
   virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
                                                  int64_t &Res) const = 0;
+  virtual error_code getRelocationValueString(DataRefImpl Rel,
+                                       SmallVectorImpl<char> &Result) const = 0;
 
 public:
-  template<class content_type>
-  class content_iterator {
-    content_type Current;
-  public:
-    content_iterator(content_type symb)
-      : Current(symb) {}
-
-    const content_type* operator->() const {
-      return &Current;
-    }
-
-    const content_type &operator*() const {
-      return Current;
-    }
-
-    bool operator==(const content_iterator &other) const {
-      return Current == other.Current;
-    }
-
-    bool operator!=(const content_iterator &other) const {
-      return !(*this == other);
-    }
-
-    content_iterator& increment(error_code &err) {
-      content_type next;
-      if (error_code ec = Current.getNext(next))
-        err = ec;
-      else
-        Current = next;
-      return *this;
-    }
-  };
-
-  typedef content_iterator<SymbolRef> symbol_iterator;
-  typedef content_iterator<SectionRef> section_iterator;
-  typedef content_iterator<RelocationRef> relocation_iterator;
 
   virtual symbol_iterator begin_symbols() const = 0;
   virtual symbol_iterator end_symbols() const = 0;
@@ -244,9 +270,6 @@ public:
   virtual section_iterator begin_sections() const = 0;
   virtual section_iterator end_sections() const = 0;
 
-  virtual relocation_iterator begin_relocations() const = 0;
-  virtual relocation_iterator end_relocations() const = 0;
-
   /// @brief The number of bytes used to represent an address in this object
   ///        file format.
   virtual uint8_t getBytesInAddress() const = 0;
@@ -366,6 +389,14 @@ inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
                                              Result);
 }
 
+inline relocation_iterator SectionRef::begin_relocations() const {
+  return OwningObject->getSectionRelBegin(SectionPimpl);
+}
+
+inline relocation_iterator SectionRef::end_relocations() const {
+  return OwningObject->getSectionRelEnd(SectionPimpl);
+}
+
 
 /// RelocationRef
 inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
@@ -393,10 +424,20 @@ inline error_code RelocationRef::getType(uint32_t &Result) const {
   return OwningObject->getRelocationType(RelocationPimpl, Result);
 }
 
+inline error_code RelocationRef::getTypeName(SmallVectorImpl<char> &Result)
+  const {
+  return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
+}
+
 inline error_code RelocationRef::getAdditionalInfo(int64_t &Result) const {
   return OwningObject->getRelocationAdditionalInfo(RelocationPimpl, Result);
 }
 
+inline error_code RelocationRef::getValueString(SmallVectorImpl<char> &Result)
+  const {
+  return OwningObject->getRelocationValueString(RelocationPimpl, Result);
+}
+
 } // end namespace object
 } // end namespace llvm