1 files changed, 196 insertions, 0 deletions
diff --git a/lib/VMCore/Mangler.cpp b/lib/VMCore/Mangler.cpp
new file mode 100644
index 0000000..0bd190a
--- /dev/null
+++ b/lib/VMCore/Mangler.cpp
@@ -0,0 +1,196 @@
+//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file 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/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+using namespace llvm;
+
+static char HexDigit(int V) {
+  return V < 10 ? V+'0' : V+'A'-10;
+}
+
+static std::string MangleLetter(unsigned char C) {
+  char Result[] = { '_', HexDigit(C >> 4), HexDigit(C & 15), '_', 0 };
+  return Result;
+}
+
+/// 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, const char *Prefix,
+                                    const char *PrivatePrefix) {
+  if (X.empty()) return X;  // Empty names are uniqued by the caller.
+  
+  // If PreserveAsmNames is set, names with asm identifiers are not modified. 
+  if (PreserveAsmNames && X[0] == 1)
+    return X;
+  
+  if (!UseQuotes) {
+    std::string Result;
+
+    // If X does not start with (char)1, add the prefix.
+    bool NeedPrefix = true;
+    std::string::const_iterator I = X.begin();
+    if (*I == 1) {
+      NeedPrefix = false;
+      ++I;  // Skip over the marker.
+    }
+    
+    // Mangle the first letter specially, don't allow numbers.
+    if (*I >= '0' && *I <= '9')
+      Result += MangleLetter(*I++);
+
+    for (std::string::const_iterator E = X.end(); I != E; ++I) {
+      if (!isCharAcceptable(*I))
+        Result += MangleLetter(*I);
+      else
+        Result += *I;
+    }
+
+    if (NeedPrefix) {
+      if (Prefix)
+        Result = Prefix + Result;
+      if (PrivatePrefix)
+        Result = PrivatePrefix + Result;
+    }
+    return Result;
+  }
+
+  bool NeedPrefix = true;
+  bool NeedQuotes = false;
+  std::string Result;    
+  std::string::const_iterator I = X.begin();
+  if (*I == 1) {
+    NeedPrefix = false;
+    ++I;  // Skip over the marker.
+  }
+
+  // If the first character is a number, we need quotes.
+  if (*I >= '0' && *I <= '9')
+    NeedQuotes = true;
+    
+  // Do an initial scan of the string, checking to see if we need quotes or
+  // to escape a '"' or not.
+  if (!NeedQuotes)
+    for (std::string::const_iterator E = X.end(); I != E; ++I)
+      if (!isCharAcceptable(*I)) {
+        NeedQuotes = true;
+        break;
+      }
+    
+  // In the common case, we don't need quotes.  Handle this quickly.
+  if (!NeedQuotes) {
+    if (NeedPrefix) {
+      if (Prefix)
+        Result = Prefix + X;
+      else
+        Result = X;
+      if (PrivatePrefix)
+        Result = PrivatePrefix + Result;
+      return Result;
+    } else
+      return X.substr(1);
+  }
+    
+  // Otherwise, construct the string the expensive way.
+  for (std::string::const_iterator E = X.end(); I != E; ++I) {
+    if (*I == '"')
+      Result += "_QQ_";
+    else if (*I == '\n')
+      Result += "_NL_";
+    else
+      Result += *I;
+  }
+
+  if (NeedPrefix) {
+    if (Prefix)
+      Result = Prefix + X;
+    else
+      Result = X;
+    if (PrivatePrefix)
+      Result = PrivatePrefix + Result;
+  }
+  Result = '"' + Result + '"';
+  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) {
+  if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
+    return getValueName(GV);
+  
+  std::string &Name = Memo[V];
+  if (!Name.empty())
+    return Name;       // Return the already-computed name for V.
+  
+  // Always mangle local names.
+  Name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType()));
+  return Name;
+}
+
+
+std::string Mangler::getValueName(const GlobalValue *GV, const char * Suffix) {
+  // Check to see whether we've already named V.
+  std::string &Name = Memo[GV];
+  if (!Name.empty())
+    return Name;       // Return the already-computed name for V.
+
+  // Name mangling occurs as follows:
+  // - If V is an intrinsic function, do not change name at all
+  // - Otherwise, mangling occurs if global collides with existing name.
+  if (isa<Function>(GV) && cast<Function>(GV)->isIntrinsic()) {
+    Name = GV->getNameStart(); // Is an intrinsic function
+  } else if (!GV->hasName()) {
+    // Must mangle the global into a unique ID.
+    unsigned TypeUniqueID = getTypeID(GV->getType());
+    static unsigned GlobalID = 0;
+    Name = "__unnamed_" + utostr(TypeUniqueID) + "_" + utostr(GlobalID++);
+  } else {
+    if (GV->hasPrivateLinkage())
+      Name = makeNameProper(GV->getName() + Suffix, Prefix, PrivatePrefix);
+    else
+      Name = makeNameProper(GV->getName() + Suffix, Prefix);
+  }
+
+  return Name;
+}
+
+Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix)
+  : Prefix(prefix), PrivatePrefix (privatePrefix), UseQuotes(false),
+    PreserveAsmNames(false), Count(0), TypeCounter(0) {
+  std::fill(AcceptableChars, array_endof(AcceptableChars), 0);
+
+  // Letters and numbers are acceptable.
+  for (unsigned char X = 'a'; X <= 'z'; ++X)
+    markCharAcceptable(X);
+  for (unsigned char X = 'A'; X <= 'Z'; ++X)
+    markCharAcceptable(X);
+  for (unsigned char X = '0'; X <= '9'; ++X)
+    markCharAcceptable(X);
+  
+  // These chars are acceptable.
+  markCharAcceptable('_');
+  markCharAcceptable('$');
+  markCharAcceptable('.');
+}