[ELF][Writer] Use Path to create AtomSection.

Now since the correct file path for atoms is available and not clobbered,
commit r222309 which was reverted previously can be added back.

No change in functionality.

llvm-svn: 230138

lld/lib/ReaderWriter/ELF/DefaultLayout.h

@@ -91,24 +91,26 @@ public:
   // The sections are created using
   // SectionName, contentPermissions
   struct SectionKey {
-    SectionKey(StringRef name, DefinedAtom::ContentPermissions perm)
-        : _name(name), _perm(perm) {
-    }
+    SectionKey(StringRef name, DefinedAtom::ContentPermissions perm,
+               StringRef path)
+        : _name(name), _perm(perm), _path(path) {}
 
     // Data members
     StringRef _name;
     DefinedAtom::ContentPermissions _perm;
+    StringRef _path;
   };
 
   struct SectionKeyHash {
     int64_t operator()(const SectionKey &k) const {
-      return llvm::hash_combine(k._name, k._perm);
+      return llvm::hash_combine(k._name, k._perm, k._path);
     }
   };
 
   struct SectionKeyEq {
     bool operator()(const SectionKey &lhs, const SectionKey &rhs) const {
-      return ((lhs._name == rhs._name) && (lhs._perm == rhs._perm));
+      return ((lhs._name == rhs._name) && (lhs._perm == rhs._perm) &&
+              (lhs._path == rhs._path));
     }
   };
 
@@ -181,9 +183,10 @@ public:
   virtual StringRef getOutputSectionName(StringRef inputSectionName) const;
 
   /// \brief Gets or creates a section.
-  AtomSection<ELFT> *getSection(
-      StringRef name, int32_t contentType,
-      DefinedAtom::ContentPermissions contentPermissions);
+  AtomSection<ELFT> *
+  getSection(StringRef name, int32_t contentType,
+             DefinedAtom::ContentPermissions contentPermissions,
+             StringRef path);
 
   /// \brief Gets the segment for a output section
   virtual Layout::SegmentType getSegmentType(Section<ELFT> *section) const;
@@ -530,22 +533,19 @@ AtomSection<ELFT> *DefaultLayout<ELFT>::createSection(
 }
 
 template <class ELFT>
-AtomSection<ELFT> *DefaultLayout<ELFT>::getSection(
-    StringRef sectionName, int32_t contentType,
-    DefinedAtom::ContentPermissions permissions) {
-  // FIXME: We really need the file path here in the SectionKey, when that
-  // is available, replace the sectionKey that has outputSectionName to the
-  // inputSectionName.
-  StringRef outputSectionName = getOutputSectionName(sectionName);
-  const SectionKey sectionKey(outputSectionName, permissions);
+AtomSection<ELFT> *
+DefaultLayout<ELFT>::getSection(StringRef sectionName, int32_t contentType,
+                                DefinedAtom::ContentPermissions permissions,
+                                StringRef path) {
+  const SectionKey sectionKey(sectionName, permissions, path);
+  SectionOrder sectionOrder =
+      getSectionOrder(sectionName, contentType, permissions);
   auto sec = _sectionMap.find(sectionKey);
   if (sec != _sectionMap.end())
     return sec->second;
-  SectionOrder sectionOrder =
-      getSectionOrder(sectionName, contentType, permissions);
   AtomSection<ELFT> *newSec =
       createSection(sectionName, contentType, permissions, sectionOrder);
-  newSec->setOutputSectionName(outputSectionName);
+  newSec->setOutputSectionName(getOutputSectionName(sectionName));
   newSec->setOrder(sectionOrder);
   _sections.push_back(newSec);
   _sectionMap.insert(std::make_pair(sectionKey, newSec));
@@ -565,8 +565,8 @@ ErrorOr<const lld::AtomLayout &> DefaultLayout<ELFT>::addAtom(const Atom *atom)
     const DefinedAtom::ContentType contentType = definedAtom->contentType();
 
     StringRef sectionName = getInputSectionName(definedAtom);
-    AtomSection<ELFT> *section =
-        getSection(sectionName, contentType, permissions);
+    AtomSection<ELFT> *section = getSection(
+        sectionName, contentType, permissions, definedAtom->file().path());
 
     // Add runtime relocations to the .rela section.
     for (const auto &reloc : *definedAtom) {

lld/lib/ReaderWriter/ELF/Mips/MipsTargetHandler.h

@@ -67,6 +67,17 @@ public:
     return *_gpDispAtom;
   }
 
+  /// \brief Return the section order for a input section
+  virtual Layout::SectionOrder getSectionOrder(StringRef name,
+                                               int32_t contentType,
+                                               int32_t contentPermissions) {
+    if ((contentType == DefinedAtom::typeStub) && (name.startswith(".text")))
+      return DefaultLayout<ELFType>::ORDER_TEXT;
+
+    return DefaultLayout<ELFType>::getSectionOrder(name, contentType,
+                                                   contentPermissions);
+  }
+
 private:
   llvm::BumpPtrAllocator _alloc;
   MipsGOTSection<ELFType> *_gotSection;