Reorganize llvmc code.

Move the code from 'llvmc/driver' into a new CompilerDriver library, and change
the build system accordingly. Makes it easier for projects using LLVM to build
their own llvmc-based drivers.

Tested with objdir != srcdir.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65821 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CompilerDriver/Tool.cpp

@@ -0,0 +1,74 @@
+//===--- Tool.cpp - The LLVM Compiler Driver --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open
+// Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  Tool base class - implementation details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CompilerDriver/Tool.h"
+
+#include "llvm/System/Path.h"
+#include "llvm/Support/CommandLine.h"
+
+using namespace llvm;
+using namespace llvmc;
+
+extern cl::opt<std::string> OutputFilename;
+
+namespace {
+  sys::Path MakeTempFile(const sys::Path& TempDir, const std::string& BaseName,
+                         const std::string& Suffix) {
+    sys::Path Out;
+
+    // Make sure we don't end up with path names like '/file.o' if the
+    // TempDir is empty.
+    if (TempDir.empty()) {
+      Out.set(BaseName);
+    }
+    else {
+      Out = TempDir;
+      Out.appendComponent(BaseName);
+    }
+    Out.appendSuffix(Suffix);
+    // NOTE: makeUnique always *creates* a unique temporary file,
+    // which is good, since there will be no races. However, some
+    // tools do not like it when the output file already exists, so
+    // they have to be placated with -f or something like that.
+    Out.makeUnique(true, NULL);
+    return Out;
+  }
+}
+
+sys::Path Tool::OutFilename(const sys::Path& In,
+                            const sys::Path& TempDir,
+                            bool StopCompilation,
+                            const char* OutputSuffix) const {
+  sys::Path Out;
+
+  if (StopCompilation) {
+    if (!OutputFilename.empty()) {
+      Out.set(OutputFilename);
+    }
+    else if (IsJoin()) {
+      Out.set("a");
+      Out.appendSuffix(OutputSuffix);
+    }
+    else {
+      Out.set(In.getBasename());
+      Out.appendSuffix(OutputSuffix);
+    }
+  }
+  else {
+    if (IsJoin())
+      Out = MakeTempFile(TempDir, "tmp", OutputSuffix);
+    else
+      Out = MakeTempFile(TempDir, In.getBasename(), OutputSuffix);
+  }
+  return Out;
+}