1 files changed, 127 insertions, 0 deletions
diff --git a/llvm/lib/VMCore/Mangler.cpp b/llvm/lib/VMCore/Mangler.cpp
new file mode 100644
index 00000000000..bf989b41ce8
--- /dev/null
+++ b/llvm/lib/VMCore/Mangler.cpp
@@ -0,0 +1,127 @@
+//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// Unified name mangler for CWriter and assembly backends.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Mangler.h"
+#include "llvm/Module.h"
+#include "llvm/Type.h"
+#include "Support/StringExtras.h"
+using namespace llvm;
+
+static char HexDigit(int V) {
+  return V < 10 ? V+'0' : V+'A'-10;
+}
+
+static std::string MangleLetter(unsigned char C) {
+  return std::string("_")+HexDigit(C >> 4) + HexDigit(C & 15) + "_";
+}
+
+/// makeNameProper - We don't want identifier names non-C-identifier characters
+/// in them, so mangle them as appropriate.
+/// 
+std::string Mangler::makeNameProper(const std::string &X) {
+  std::string Result;
+  
+  // Mangle the first letter specially, don't allow numbers...
+  if ((X[0] < 'a' || X[0] > 'z') && (X[0] < 'A' || X[0] > 'Z') && X[0] != '_')
+    Result += MangleLetter(X[0]);
+  else
+    Result += X[0];
+
+  for (std::string::const_iterator I = X.begin()+1, E = X.end(); I != E; ++I)
+    if ((*I < 'a' || *I > 'z') && (*I < 'A' || *I > 'Z') &&
+        (*I < '0' || *I > '9') && *I != '_')
+      Result += MangleLetter(*I);
+    else
+      Result += *I;
+  return Result;
+}
+
+/// getTypeID - Return a unique ID for the specified LLVM type.
+///
+unsigned Mangler::getTypeID(const Type *Ty) {
+  unsigned &E = TypeMap[Ty];
+  if (E == 0) E = ++TypeCounter;
+  return E;
+}
+
+
+std::string Mangler::getValueName(const Value *V) {
+  // Check to see whether we've already named V.
+  ValueMap::iterator VI = Memo.find(V);
+  if (VI != Memo.end()) {
+    return VI->second; // Return the old name for V.
+  }
+
+  std::string name;
+  if (V->hasName()) { // Print out the label if it exists...
+    // Name mangling occurs as follows:
+    // - If V is an intrinsic function, do not change name at all
+    // - If V is not a global, mangling always occurs.
+    // - Otherwise, mangling occurs when any of the following are true:
+    //   1) V has internal linkage
+    //   2) V's name would collide if it is not mangled.
+    //
+    const GlobalValue* gv = dyn_cast<GlobalValue>(V);
+    if (gv && isa<Function>(gv) && cast<Function>(gv)->getIntrinsicID()) {
+      name = gv->getName(); // Is an intrinsic function
+    } else if (gv && !gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
+      name = makeNameProper(gv->getName());
+      if (AddUnderscorePrefix) name = "_" + name;
+    } else {
+      // Non-global, or global with internal linkage / colliding name
+      // -> mangle.
+      unsigned TypeUniqueID = getTypeID(V->getType());
+      name = "l" + utostr(TypeUniqueID) + "_" + makeNameProper(V->getName());
+    }
+  } else {
+    name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType()));
+  }
+  
+  Memo[V] = name;
+  return name;
+}
+
+void Mangler::InsertName(GlobalValue *GV,
+                         std::map<std::string, GlobalValue*> &Names) {
+  if (!GV->hasName()) {   // We must mangle unnamed globals.
+    MangledGlobals.insert(GV);
+    return;
+  }
+
+  // Figure out if this is already used.
+  GlobalValue *&ExistingValue = Names[GV->getName()];
+  if (!ExistingValue) {
+    ExistingValue = GV;
+  } else {
+    // If GV is external but the existing one is static, mangle the existing one
+    if (GV->hasExternalLinkage() && !ExistingValue->hasExternalLinkage()) {
+      MangledGlobals.insert(ExistingValue);
+      ExistingValue = GV;
+    } else {
+      // Otherwise, mangle GV
+      MangledGlobals.insert(GV);
+    }
+  }
+}
+
+
+Mangler::Mangler(Module &m, bool addUnderscorePrefix)
+  : M(m), AddUnderscorePrefix(addUnderscorePrefix), TypeCounter(0), Count(0) {
+  // Calculate which global values have names that will collide when we throw
+  // away type information.
+  std::map<std::string, GlobalValue*> Names;
+  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
+    InsertName(I, Names);
+  for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
+    InsertName(I, Names);
+}