move the mangler into libtarget from vmcore.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93664 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 104 insertions, 0 deletions

diff --git a/lib/Target/Mangler.cpp b/lib/Target/Mangler.cpp
new file mode 100644
index 0000000000..eb010c3a68
--- /dev/null
+++ b/lib/Target/Mangler.cpp
@@ -0,0 +1,104 @@
+//===-- 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 assembly backends.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Target/Mangler.h"
+#include "llvm/GlobalValue.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
+/// and the specified name as the global variable name.  GVName must not be
+/// empty.
+void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
+                                const Twine &GVName, ManglerPrefixTy PrefixTy) {
+  SmallString<256> TmpData;
+  StringRef Name = GVName.toStringRef(TmpData);
+  assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
+  
+  // If the global name is not led with \1, add the appropriate prefixes.
+  if (Name[0] != '\1') {
+    if (PrefixTy == Mangler::Private)
+      OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
+    else if (PrefixTy == Mangler::LinkerPrivate)
+      OutName.append(LinkerPrivatePrefix,
+                     LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));
+    
+    if (Prefix[0] == 0)
+      ; // Common noop, no prefix.
+    else if (Prefix[1] == 0)
+      OutName.push_back(Prefix[0]);  // Common, one character prefix.
+    else
+      OutName.append(Prefix, Prefix+strlen(Prefix)); // Arbitrary prefix.
+  } else {
+    Name = Name.substr(1);
+  }
+  
+  OutName.append(Name.begin(), Name.end());
+}
+
+
+/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
+/// and the specified global variable's name.  If the global variable doesn't
+/// have a name, this fills in a unique name for the global.
+void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
+                                const GlobalValue *GV,
+                                bool isImplicitlyPrivate) {
+  // If this global has a name, handle it simply.
+  if (GV->hasName()) {
+    ManglerPrefixTy PrefixTy = Mangler::Default;
+    if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
+      PrefixTy = Mangler::Private;
+    else if (GV->hasLinkerPrivateLinkage())
+      PrefixTy = Mangler::LinkerPrivate;
+    
+    return getNameWithPrefix(OutName, GV->getName(), PrefixTy);
+  }
+  
+  // If the global variable doesn't have a name, return a unique name for the
+  // global based on a numbering.
+  
+  // Anonymous names always get prefixes.
+  if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
+    OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
+  else if (GV->hasLinkerPrivateLinkage())
+    OutName.append(LinkerPrivatePrefix,
+                   LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));;
+  OutName.append(Prefix, Prefix+strlen(Prefix));
+  
+  // Get the ID for the global, assigning a new one if we haven't got one
+  // already.
+  unsigned &ID = AnonGlobalIDs[GV];
+  if (ID == 0) ID = NextAnonGlobalID++;
+  
+  // Must mangle the global into a unique ID.
+  raw_svector_ostream(OutName) << "__unnamed_" << ID;
+}
+
+/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
+/// and the specified global variable's name.  If the global variable doesn't
+/// have a name, this fills in a unique name for the global.
+std::string Mangler::getNameWithPrefix(const GlobalValue *GV,
+                                       bool isImplicitlyPrivate) {
+  SmallString<64> Buf;
+  getNameWithPrefix(Buf, GV, isImplicitlyPrivate);
+  return std::string(Buf.begin(), Buf.end());
+}
+  
+
+Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix,
+                 const char *linkerPrivatePrefix)
+  : Prefix(prefix), PrivatePrefix(privatePrefix),
+    LinkerPrivatePrefix(linkerPrivatePrefix), NextAnonGlobalID(1) {
+}