Add initial prototype for the GN meta-buildsystem.

tools/gn/toolchain.cc

Index: tools/gn/toolchain.cc
diff --git a/tools/gn/toolchain.cc b/tools/gn/toolchain.cc
new file mode 100644
index 0000000000000000000000000000000000000000..20b81f5506b9b4ab90d9a14dcfe39d5c5b1286c1
--- /dev/null
+++ b/tools/gn/toolchain.cc
@@ -0,0 +1,79 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "tools/gn/toolchain.h"
+
+#include "base/logging.h"
+
+const char* Toolchain::kToolCc = "cc";
+const char* Toolchain::kToolCxx = "cxx";
+const char* Toolchain::kToolAsm = "asm";
+const char* Toolchain::kToolAlink = "alink";
+const char* Toolchain::kToolSolink = "solink";
+const char* Toolchain::kToolSolinkModule = "solink_module";
+const char* Toolchain::kToolLink = "link";
+const char* Toolchain::kToolStamp = "stamp";
+const char* Toolchain::kToolCopy = "copy";
+
+Toolchain::Tool::Tool() {
+}
+
+Toolchain::Tool::~Tool() {
+}
+
+Toolchain::Toolchain(const Label& label) : Item(label) {
+}
+
+Toolchain::~Toolchain() {
+}
+
+Toolchain* Toolchain::AsToolchain() {
+  return this;
+}
+
+const Toolchain* Toolchain::AsToolchain() const {
+  return this;
+}
+
+// static
+Toolchain::ToolType Toolchain::ToolNameToType(const base::StringPiece& str) {
+  if (str == kToolCc) return TYPE_CC;
+  if (str == kToolCxx) return TYPE_CXX;
+  if (str == kToolAsm) return TYPE_ASM;
+  if (str == kToolAlink) return TYPE_ALINK;
+  if (str == kToolSolink) return TYPE_SOLINK;
+  if (str == kToolSolinkModule) return TYPE_SOLINK_MODULE;
+  if (str == kToolLink) return TYPE_LINK;
+  if (str == kToolStamp) return TYPE_STAMP;
+  if (str == kToolCopy) return TYPE_COPY;
+  return TYPE_NONE;
+}
+
+// static
+std::string Toolchain::ToolTypeToName(ToolType type) {
+  switch (type) {
+    case TYPE_CC: return kToolCc;
+    case TYPE_CXX: return kToolCxx;
+    case TYPE_ASM: return kToolAsm;
+    case TYPE_ALINK: return kToolAlink;
+    case TYPE_SOLINK: return kToolSolink;
+    case TYPE_SOLINK_MODULE: return kToolSolinkModule;
+    case TYPE_LINK: return kToolLink;
+    case TYPE_STAMP: return kToolStamp;
+    case TYPE_COPY: return kToolCopy;
+    default:
+      NOTREACHED();
+      return std::string();
+  }
+}
+
+const Toolchain::Tool& Toolchain::GetTool(ToolType type) const {
+  DCHECK(type != TYPE_NONE);
+  return tools_[static_cast<size_t>(type)];
+}
+
+void Toolchain::SetTool(ToolType type, const Tool& t) {
+  DCHECK(type != TYPE_NONE);
+  tools_[static_cast<size_t>(type)] = t;
+}