Don't segfault in EmitCXXGlobalInitFunc when main file is a membuf

Summary: When the main file is created from a membuffer, there is no file entry that can be retrieved. This uses "__GLOBAL_I_a" in that case which is what was always used before r208128.

Reviewers: majnemer, thakis

Reviewed By: thakis

Subscribers: yaron.keren, rsmith, cfe-commits

Differential Revision: http://reviews.llvm.org/D5043

llvm-svn: 216495

1 files changed, 78 insertions, 0 deletions

diff --git a/clang/unittests/CodeGen/BufferSourceTest.cpp b/clang/unittests/CodeGen/BufferSourceTest.cpp
new file mode 100644
index 00000000000..f9d0991933f
--- /dev/null
+++ b/clang/unittests/CodeGen/BufferSourceTest.cpp
@@ -0,0 +1,78 @@
+//===- unittests/CodeGen/BufferSourceTest.cpp - MemoryBuffer source tests -===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/CodeGen/ModuleBuilder.h"
+#include "clang/Sema/Sema.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Basic/TargetInfo.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/IR/LLVMContext.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+using namespace clang;
+
+namespace {
+
+// Emitting constructors for global objects involves looking
+// at the source file name. This makes sure that we don't crash
+// if the source file is a memory buffer.
+const char TestProgram[] =
+    "class EmitCXXGlobalInitFunc    "
+    "{                              "
+    "public:                        "
+    "   EmitCXXGlobalInitFunc() {}  "
+    "};                             "
+    "EmitCXXGlobalInitFunc test;    ";
+
+TEST(BufferSourceTest, EmitCXXGlobalInitFunc) {
+    CompilerInstance compiler;
+
+    compiler.createDiagnostics();
+    compiler.getLangOpts().CPlusPlus = 1;
+    compiler.getLangOpts().CPlusPlus11 = 1;
+
+    compiler.getTargetOpts().Triple = llvm::Triple::normalize(
+        llvm::sys::getProcessTriple());
+    compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
+      compiler.getDiagnostics(),
+      std::make_shared<clang::TargetOptions>(
+        compiler.getTargetOpts())));
+
+    compiler.createFileManager();
+    compiler.createSourceManager(compiler.getFileManager());
+    compiler.createPreprocessor(clang::TU_Prefix);
+
+    compiler.createASTContext();
+
+    compiler.setASTConsumer(std::unique_ptr<ASTConsumer>(
+        CreateLLVMCodeGen(
+            compiler.getDiagnostics(),
+            "EmitCXXGlobalInitFuncTest",
+            compiler.getCodeGenOpts(),
+            compiler.getTargetOpts(),
+            llvm::getGlobalContext())));
+
+    compiler.createSema(clang::TU_Prefix,NULL);
+
+    clang::SourceManager &sm = compiler.getSourceManager();
+    sm.setMainFileID(sm.createFileID(
+        llvm::MemoryBuffer::getMemBuffer(TestProgram), clang::SrcMgr::C_User));
+
+    clang::ParseAST(compiler.getSema(), false, false);
+}
+
+}