Move name mangling support from CodeGen to AST. In the

process, perform a number of refactorings:

- Move MiscNameMangler member functions to MangleContext
- Remove GlobalDecl dependency from MangleContext
- Make MangleContext abstract and move Itanium/Microsoft functionality
  to their own classes/files
- Implement ASTContext::createMangleContext and have CodeGen use it

No (intended) functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@123386 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 132 insertions, 0 deletions

diff --git a/lib/AST/Mangle.cpp b/lib/AST/Mangle.cpp
new file mode 100644
index 0000000000..83d9ed6678
--- /dev/null
+++ b/lib/AST/Mangle.cpp
@@ -0,0 +1,132 @@
+//===--- Mangle.cpp - Mangle C++ Names --------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements generic name mangling support for blocks and Objective-C.
+//
+//===----------------------------------------------------------------------===//
+#include "clang/AST/Mangle.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclTemplate.h"
+#include "clang/AST/ExprCXX.h"
+#include "clang/Basic/ABI.h"
+#include "clang/Basic/SourceManager.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/ErrorHandling.h"
+
+#define MANGLE_CHECKER 0
+
+#if MANGLE_CHECKER
+#include <cxxabi.h>
+#endif
+
+using namespace clang;
+
+// FIXME: For blocks we currently mimic GCC's mangling scheme, which leaves
+// much to be desired. Come up with a better mangling scheme.
+
+namespace {
+
+static void mangleFunctionBlock(MangleContext &Context,
+                                llvm::StringRef Outer,
+                                const BlockDecl *BD,
+                                llvm::SmallVectorImpl<char> &Res) {
+  llvm::raw_svector_ostream Out(Res);
+  Out << "__" << Outer << "_block_invoke_" << Context.getBlockId(BD, true);
+}
+
+static void checkMangleDC(const DeclContext *DC, const BlockDecl *BD) {
+#ifndef NDEBUG
+  const DeclContext *ExpectedDC = BD->getDeclContext();
+  while (isa<BlockDecl>(ExpectedDC) || isa<EnumDecl>(ExpectedDC))
+    ExpectedDC = ExpectedDC->getParent();
+  assert(DC == ExpectedDC && "Given decl context did not match expected!");
+#endif
+}
+
+}
+
+void MangleContext::mangleGlobalBlock(const BlockDecl *BD,
+                                      llvm::SmallVectorImpl<char> &Res) {
+  llvm::raw_svector_ostream Out(Res);
+  Out << "__block_global_" << getBlockId(BD, false);
+}
+
+void MangleContext::mangleCtorBlock(const CXXConstructorDecl *CD,
+                                    CXXCtorType CT, const BlockDecl *BD,
+                                    llvm::SmallVectorImpl<char> &Res) {
+  checkMangleDC(CD, BD);
+  llvm::SmallString<64> Buffer;
+  mangleCXXCtor(CD, CT, Buffer);
+  mangleFunctionBlock(*this, Buffer, BD, Res);
+}
+
+void MangleContext::mangleDtorBlock(const CXXDestructorDecl *DD,
+                                    CXXDtorType DT, const BlockDecl *BD,
+                                    llvm::SmallVectorImpl<char> &Res) {
+  checkMangleDC(DD, BD);
+  llvm::SmallString<64> Buffer;
+  mangleCXXDtor(DD, DT, Buffer);
+  mangleFunctionBlock(*this, Buffer, BD, Res);
+}
+
+void MangleContext::mangleBlock(const DeclContext *DC, const BlockDecl *BD,
+                                llvm::SmallVectorImpl<char> &Res) {
+  assert(!isa<CXXConstructorDecl>(DC) && !isa<CXXDestructorDecl>(DC));
+  checkMangleDC(DC, BD);
+
+  llvm::SmallString<64> Buffer;
+  if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(DC)) {
+    mangleObjCMethodName(Method, Buffer);
+  } else {
+    const NamedDecl *ND = cast<NamedDecl>(DC);
+    if (IdentifierInfo *II = ND->getIdentifier())
+      Buffer = II->getName();
+    else {
+      // FIXME: We were doing a mangleUnqualifiedName() before, but that's
+      // a private member of a class that will soon itself be private to the
+      // Itanium C++ ABI object. What should we do now? Right now, I'm just
+      // calling the mangleName() method on the MangleContext; is there a
+      // better way?
+      mangleName(ND, Buffer);
+    }
+  }
+
+  mangleFunctionBlock(*this, Buffer, BD, Res);
+}
+
+void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD,
+                                         llvm::SmallVectorImpl<char> &Res) {
+  llvm::SmallString<64> Name;
+  llvm::raw_svector_ostream OS(Name), Out(Res);
+  
+  const ObjCContainerDecl *CD =
+  dyn_cast<ObjCContainerDecl>(MD->getDeclContext());
+  assert (CD && "Missing container decl in GetNameForMethod");
+  OS << (MD->isInstanceMethod() ? '-' : '+') << '[' << CD->getName();
+  if (const ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(CD))
+    OS << '(' << CID << ')';
+  OS << ' ' << MD->getSelector().getAsString() << ']';
+  
+  Out << OS.str().size() << OS.str();
+}
+
+void MangleContext::mangleBlock(const BlockDecl *BD,
+                                llvm::SmallVectorImpl<char> &Res) {
+  const DeclContext *DC = BD->getDeclContext();
+  while (isa<BlockDecl>(DC) || isa<EnumDecl>(DC))
+    DC = DC->getParent();
+  if (DC->isFunctionOrMethod())
+    mangleBlock(DC, BD, Res);
+  else
+    mangleGlobalBlock(BD, Res);
+}