Initial checkin of name mangling code moved from linker

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1018 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/support/lib/Support/NameMangling.cpp b/support/lib/Support/NameMangling.cpp
new file mode 100644 (file)
index 0000000..675a7ff
--- /dev/null
+++ b/support/lib/Support/NameMangling.cpp
@@ -0,0 +1,46 @@
+//===- NameMangling.cpp - Name Mangling for LLVM ----------------------------=//
+//
+// This file implements a consistent scheme for name mangling symbols.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/NameMangling.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/GlobalValue.h"
+
+// MangleTypeName - Implement a consistent name-mangling scheme for
+//                  a given type.
+// 
+string MangleTypeName(const Type *Ty) {
+  string mangledName;
+  if (Ty->isPrimitiveType()) {
+    const string &longName = Ty->getDescription();
+    return string(longName.c_str(), (longName.length() < 2) ? 1 : 2);
+  } else if (PointerType *PTy = dyn_cast<PointerType>(Ty)) {
+    mangledName = string("P_" + MangleTypeName(PTy->getValueType()));
+  } else if (StructType *STy = dyn_cast<StructType>(Ty)) {
+    mangledName = string("S_");
+    for (unsigned i=0; i < STy->getNumContainedTypes(); ++i)
+      mangledName += MangleTypeName(STy->getContainedType(i));
+  } else if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
+    mangledName = string("A_" +MangleTypeName(ATy->getElementType()));
+  } else if (MethodType *MTy = dyn_cast<MethodType>(Ty)) {
+    mangledName = string("M_") + MangleTypeName(MTy->getReturnType());
+    for (unsigned i = 1; i < MTy->getNumContainedTypes(); ++i)
+      mangledName += string(MangleTypeName(MTy->getContainedType(i)));
+  }
+  
+  return mangledName;
+}
+
+// mangleName - implement a consistent name-mangling scheme for all
+// externally visible (i.e., global) objects.
+// privateName should be unique within the module.
+// 
+string MangleName(const string &privateName, const Value *V) {
+  // Lets drop the P_ before every global name since all globals are ptrs
+  return privateName + "_" +
+    MangleTypeName(isa<GlobalValue>(V)
+                   ? cast<GlobalValue>(V)->getType()->getValueType()
+                   : V->getType());
+}