clang: add support for asmjs arch and Emscripten OS

lib/CodeGen/CodeGenModule.cpp

 //===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This coordinates the per-module state used while generating code.
@@ skipping 44 matching lines @@
 
 using namespace clang;
 using namespace CodeGen;
 
 static const char AnnotationSection[] = "llvm.metadata";
 
 static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
   switch (CGM.getTarget().getCXXABI().getKind()) {
   case TargetCXXABI::GenericAArch64:
   case TargetCXXABI::GenericARM:
+  case TargetCXXABI::Emscripten: // @LOCALMOD Emscripten
   case TargetCXXABI::iOS:
   case TargetCXXABI::iOS64:
   case TargetCXXABI::GenericItanium:
     return CreateItaniumCXXABI(CGM);
   case TargetCXXABI::Microsoft:
     return CreateMicrosoftCXXABI(CGM);
   }
 
   llvm_unreachable("invalid C++ ABI kind");
 }
@@ skipping 705 matching lines @@
   if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
     F->setUnnamedAddr(true);
   else if (const auto *MD = dyn_cast<CXXMethodDecl>(D))
     if (MD->isVirtual())
       F->setUnnamedAddr(true);
 
   unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
   if (alignment)
     F->setAlignment(alignment);
 
-  // C++ ABI requires 2-byte alignment for member functions.
-  if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
-    F->setAlignment(2);
+  // @LOCALMOD-START Emscripten
+  if (getTarget().getCXXABI().arePointersToMemberFunctionsAligned()) {
+    // C++ ABI requires 2-byte alignment for member functions.
+    if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
+      F->setAlignment(2);
+  }
+  // @LOCALMOD-END Emscripten
 }
 
 void CodeGenModule::SetCommonAttributes(const Decl *D,
                                         llvm::GlobalValue *GV) {
   if (const auto *ND = dyn_cast<NamedDecl>(D))
     setGlobalVisibility(GV, ND);
   else
     GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
 
   if (D->hasAttr<UsedAttr>())
@@ skipping 2747 matching lines @@
         VD->getAnyInitializer() &&
         !VD->getAnyInitializer()->isConstantInitializer(getContext(),
                                                         /*ForRef=*/false);
     if (auto InitFunction =
             getOpenMPRuntime().EmitOMPThreadPrivateVarDefinition(
                 VD, GetAddrOfGlobalVar(VD), RefExpr->getLocStart(),
                 PerformInit))
       CXXGlobalInits.push_back(InitFunction);
   }
 }
-

[jvoung (off chromium), 2015/03/20 17:07:07]

nit: extra change?

[JF, 2015/03/20 18:49:38]

Oops, emacs decided to delete the extra line.