[GN]: Support for loadable modules

tools/gn/toolchain.cc

 // 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 <string.h>
 
 #include "base/logging.h"
 #include "tools/gn/target.h"
 #include "tools/gn/value.h"
 
 const char* Toolchain::kToolCc = "cc";
 const char* Toolchain::kToolCxx = "cxx";
 const char* Toolchain::kToolObjC = "objc";
 const char* Toolchain::kToolObjCxx = "objcxx";
 const char* Toolchain::kToolRc = "rc";
 const char* Toolchain::kToolAsm = "asm";
 const char* Toolchain::kToolAlink = "alink";
+const char* Toolchain::kToolDylink = "dylink";
 const char* Toolchain::kToolSolink = "solink";
 const char* Toolchain::kToolLink = "link";
 const char* Toolchain::kToolStamp = "stamp";
 const char* Toolchain::kToolCopy = "copy";
 
 Toolchain::Toolchain(const Settings* settings, const Label& label)
     : Item(settings, label),
       concurrent_links_(0),
       setup_complete_(false) {
 }
@@ skipping 11 matching lines @@
 
 // static
 Toolchain::ToolType Toolchain::ToolNameToType(const base::StringPiece& str) {
   if (str == kToolCc) return TYPE_CC;
   if (str == kToolCxx) return TYPE_CXX;
   if (str == kToolObjC) return TYPE_OBJC;
   if (str == kToolObjCxx) return TYPE_OBJCXX;
   if (str == kToolRc) return TYPE_RC;
   if (str == kToolAsm) return TYPE_ASM;
   if (str == kToolAlink) return TYPE_ALINK;
+  if (str == kToolDylink) return TYPE_DYLINK;
   if (str == kToolSolink) return TYPE_SOLINK;
   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_OBJC: return kToolObjC;
     case TYPE_OBJCXX: return kToolObjCxx;
     case TYPE_RC: return kToolRc;
     case TYPE_ASM: return kToolAsm;
     case TYPE_ALINK: return kToolAlink;
+    case TYPE_DYLINK: return kToolDylink;
     case TYPE_SOLINK: return kToolSolink;
     case TYPE_LINK: return kToolLink;
     case TYPE_STAMP: return kToolStamp;
     case TYPE_COPY: return kToolCopy;
     default:
       NOTREACHED();
       return std::string();
   }
 }
 
@@ skipping 54 matching lines @@
 Toolchain::ToolType Toolchain::GetToolTypeForTargetFinalOutput(
     const Target* target) {
   // The contents of this list might be suprising (i.e. stamp tool for copy
   // rules). See the header for why.
   switch (target->output_type()) {
     case Target::GROUP:
       return TYPE_STAMP;
     case Target::EXECUTABLE:
       return Toolchain::TYPE_LINK;
     case Target::SHARED_LIBRARY:
+      // TODO(andybons): Uncomment on the next roll, which must include the
+      // BUILD file changes.
+      //if (target->loadable_module())
+      //  return Toolchain::TYPE_SOLINK;
+      //return Toolchain::TYPE_DYLINK;
       return Toolchain::TYPE_SOLINK;
     case Target::STATIC_LIBRARY:
       return Toolchain::TYPE_ALINK;
     case Target::SOURCE_SET:
       return TYPE_STAMP;
     case Target::COPY_FILES:
     case Target::ACTION:
     case Target::ACTION_FOREACH:
       return TYPE_STAMP;
     default:
       NOTREACHED();
       return Toolchain::TYPE_NONE;
   }
 }
 
 const Tool* Toolchain::GetToolForTargetFinalOutput(const Target* target) const {
   return tools_[GetToolTypeForTargetFinalOutput(target)].get();
 }