Add ASTUnit::LoadFromCommandLine, which creates an ASTUnit out of a list of

(clang/driver) command line arguments (including the source file).
 - The arguments are expected to include the source file.

 - The idea is that even though this is a somewhat odd API, its the form which
   many tools can most easily use (for example, by interposing with the compiler).

Also, switch index-test's -ast-from-source to use this entry point, and provide
a -arg command line argument which can be used to test that the command line
arguments are handled correctly.

llvm-svn: 90288

1 files changed, 13 insertions, 11 deletions

diff --git a/clang/tools/index-test/index-test.cpp b/clang/tools/index-test/index-test.cpp
index dd7cbb21642..fc8547b784c 100644
--- a/clang/tools/index-test/index-test.cpp
+++ b/clang/tools/index-test/index-test.cpp
@@ -208,20 +208,24 @@ static void ProcessASTLocation(ASTLocation ASTLoc, Indexer &Idxer) {
 
 static llvm::cl::opt<bool>
 ASTFromSource("ast-from-source",
-              llvm::cl::desc("Treat the inputs as source files to parse."));
+              llvm::cl::desc("Treat the inputs as source files to parse"));
+
+static llvm::cl::list<std::string>
+CompilerArgs("arg", llvm::cl::desc("Extra arguments to use during parsing"));
 
 static llvm::cl::list<std::string>
 InputFilenames(llvm::cl::Positional, llvm::cl::desc("<input AST files>"));
 
-void CreateCompilerInvocation(const std::string &Filename,
-                              CompilerInvocation &CI, Diagnostic &Diags,
-                              const char *argv0) {
+ASTUnit *CreateFromSource(const std::string &Filename, Diagnostic &Diags,
+                          const char *Argv0) {
   llvm::SmallVector<const char *, 16> Args;
   Args.push_back(Filename.c_str());
+  for (unsigned i = 0, e = CompilerArgs.size(); i != e; ++i)
+    Args.push_back(CompilerArgs[i].c_str());
 
-  void *MainAddr = (void*) (intptr_t) CreateCompilerInvocation;
-  CompilerInvocation::CreateFromArgs(CI, Args.data(), Args.data() + Args.size(),
-                                     argv0, MainAddr, Diags);
+  return ASTUnit::LoadFromCommandLine(Args.data(), Args.data() + Args.size(),
+                                      Diags, Argv0,
+                                      (void*) (intptr_t) CreateFromSource);
 }
 
 int main(int argc, char **argv) {
@@ -249,10 +253,8 @@ int main(int argc, char **argv) {
     llvm::OwningPtr<ASTUnit> AST;
 
     if (ASTFromSource) {
-      CompilerInvocation CI;
-      CreateCompilerInvocation(InFile, CI, *Diags, argv[0]);
-      AST.reset(ASTUnit::LoadFromCompilerInvocation(CI, *Diags));
-      if (!AST)
+      AST.reset(CreateFromSource(InFile, *Diags, argv[0]));
+      if (!AST || Diags->getNumErrors())
         ErrMsg = "unable to create AST";
     } else
       AST.reset(ASTUnit::LoadFromPCHFile(InFile, &ErrMsg));