DIEHash: Summary hashing of nested types
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193427 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DIEHash.cpp b/lib/CodeGen/AsmPrinter/DIEHash.cpp
index b8b2bd2..1826467 100644
--- a/lib/CodeGen/AsmPrinter/DIEHash.cpp
+++ b/lib/CodeGen/AsmPrinter/DIEHash.cpp
@@ -384,6 +384,18 @@
hashAttributes(Attrs, Die.getTag());
}
+void DIEHash::hashNestedType(const DIE &Die, StringRef Name) {
+ // 7.27 Step 7
+ // ... append the letter 'S',
+ addULEB128('S');
+
+ // the tag of C,
+ addULEB128(Die.getTag());
+
+ // and the name.
+ addString(Name);
+}
+
// Compute the hash of a DIE. This is based on the type signature computation
// given in section 7.27 of the DWARF4 standard. It is the md5 hash of a
// flattened description of the DIE.
@@ -398,8 +410,19 @@
// Then hash each of the children of the DIE.
for (std::vector<DIE *>::const_iterator I = Die.getChildren().begin(),
E = Die.getChildren().end();
- I != E; ++I)
+ I != E; ++I) {
+ // 7.27 Step 7
+ // If C is a nested type entry or a member function entry, ...
+ if (isType((*I)->getTag())) {
+ StringRef Name = getDIEStringAttr(**I, dwarf::DW_AT_name);
+ // ... and has a DW_AT_name attribute
+ if (!Name.empty()) {
+ hashNestedType(**I, Name);
+ continue;
+ }
+ }
computeHash(**I);
+ }
// Following the last (or if there are no children), append a zero byte.
Hash.update(makeArrayRef((uint8_t)'\0'));
diff --git a/lib/CodeGen/AsmPrinter/DIEHash.h b/lib/CodeGen/AsmPrinter/DIEHash.h
index da373de..b9cf7ce 100644
--- a/lib/CodeGen/AsmPrinter/DIEHash.h
+++ b/lib/CodeGen/AsmPrinter/DIEHash.h
@@ -137,6 +137,8 @@
/// \brief Hashes a reference to a previously referenced type DIE.
void hashRepeatedTypeReference(dwarf::Attribute Attribute, unsigned DieNumber);
+ void hashNestedType(const DIE &Die, StringRef Name);
+
private:
MD5 Hash;
DenseMap<const DIE *, unsigned> Numbering;