Turn libplatform into a component

BUG=v8:5412
R=jgruber@chromium.org,machenbach@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_compile_dbg_ng;master.tryserver.chromium.android:android_clang_dbg_recipe

Review-Url: https://codereview.chromium.org/2372983003
Cr-Commit-Position: refs/heads/master@{#40111}

BUILD.gn

@@ -128,6 +128,9 @@ config("internal_config_base") {
 # This config should be applied to code using the libplatform.
 config("libplatform_config") {
   include_dirs = [ "include" ]
+  if (is_component_build) {
+    defines = [ "USING_V8_PLATFORM_SHARED" ]
+  }
 }
 
 # This config should be applied to code using the libbase.
@@ -2300,9 +2303,10 @@ v8_component("v8_libbase") {
   # TODO(jochen): Add support for qnx, freebsd, openbsd, netbsd, and solaris.
 }
 
-v8_source_set("v8_libplatform") {
+v8_component("v8_libplatform") {
   sources = [
     "//base/trace_event/common/trace_event_common.h",
+    "include/libplatform/libplatform-export.h",
     "include/libplatform/libplatform.h",
     "include/libplatform/v8-tracing.h",
     "src/libplatform/default-platform.cc",
@@ -2322,6 +2326,10 @@ v8_source_set("v8_libplatform") {
 
   configs = [ ":internal_config_base" ]
 
+  if (is_component_build) {
+    defines = [ "BUILDING_V8_PLATFORM_SHARED" ]
+  }
+
   public_configs = [ ":libplatform_config" ]
 
   deps = [
@@ -2359,6 +2367,7 @@ v8_source_set("fuzzer_support") {
   ]
 
   public_deps = [
+    ":v8_libbase",
     ":v8_libplatform",
   ]
 }

include/libplatform/DEPS

@@ -1,3 +1,7 @@
+include_rules = [
+  "+libplatform/libplatform-export.h",
+]
+
 specific_include_rules = {
   "libplatform\.h": [
     "+libplatform/v8-tracing.h",

include/libplatform/libplatform-export.h

@@ -0,0 +1,29 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_LIBPLATFORM_LIBPLATFORM_EXPORT_H_
+#define V8_LIBPLATFORM_LIBPLATFORM_EXPORT_H_
+
+#if defined(_WIN32)
+
+#ifdef BUILDING_V8_PLATFORM_SHARED
+#define V8_PLATFORM_EXPORT __declspec(dllexport)
+#elif USING_V8_PLATFORM_SHARED
+#define V8_PLATFORM_EXPORT __declspec(dllimport)
+#else
+#define V8_PLATFORM_EXPORT
+#endif  // BUILDING_V8_PLATFORM_SHARED
+
+#else  // defined(_WIN32)
+
+// Setup for Linux shared library export.
+#ifdef BUILDING_V8_PLATFORM_SHARED
+#define V8_PLATFORM_EXPORT __attribute__((visibility("default")))
+#else
+#define V8_PLATFORM_EXPORT
+#endif
+
+#endif  // defined(_WIN32)
+
+#endif  // V8_LIBPLATFORM_LIBPLATFORM_EXPORT_H_

include/libplatform/libplatform.h

@@ -5,6 +5,7 @@
 #ifndef V8_LIBPLATFORM_LIBPLATFORM_H_
 #define V8_LIBPLATFORM_LIBPLATFORM_H_
 
+#include "libplatform/libplatform-export.h"
 #include "libplatform/v8-tracing.h"
 #include "v8-platform.h"  // NOLINT(build/include)
 
@@ -19,8 +20,8 @@ namespace platform {
  * of zero is passed, a suitable default based on the current number of
  * processors online will be chosen.
  */
-v8::Platform* CreateDefaultPlatform(int thread_pool_size = 0);
-
+V8_PLATFORM_EXPORT v8::Platform* CreateDefaultPlatform(
+    int thread_pool_size = 0);
 
 /**
  * Pumps the message loop for the given isolate.
@@ -30,14 +31,15 @@ v8::Platform* CreateDefaultPlatform(int thread_pool_size = 0);
  * not block if no task is pending. The |platform| has to be created using
  * |CreateDefaultPlatform|.
  */
-bool PumpMessageLoop(v8::Platform* platform, v8::Isolate* isolate);
+V8_PLATFORM_EXPORT bool PumpMessageLoop(v8::Platform* platform,
+                                        v8::Isolate* isolate);
 
 /**
  * Attempts to set the tracing controller for the given platform.
  *
  * The |platform| has to be created using |CreateDefaultPlatform|.
  */
-void SetTracingController(
+V8_PLATFORM_EXPORT void SetTracingController(
     v8::Platform* platform,
     v8::platform::tracing::TracingController* tracing_controller);
 

include/libplatform/v8-tracing.h

@@ -10,6 +10,7 @@
 #include <unordered_set>
 #include <vector>
 
+#include "libplatform/libplatform-export.h"
 #include "v8-platform.h"  // NOLINT(build/include)
 
 namespace v8 {
@@ -23,7 +24,7 @@ namespace tracing {
 
 const int kTraceMaxNumArgs = 2;
 
-class TraceObject {
+class V8_PLATFORM_EXPORT TraceObject {
  public:
   union ArgValue {
     bool as_bool;
@@ -103,7 +104,7 @@ class TraceObject {
   void operator=(const TraceObject&) = delete;
 };
 
-class TraceWriter {
+class V8_PLATFORM_EXPORT TraceWriter {
  public:
   TraceWriter() {}
   virtual ~TraceWriter() {}
@@ -118,7 +119,7 @@ class TraceWriter {
   void operator=(const TraceWriter&) = delete;
 };
 
-class TraceBufferChunk {
+class V8_PLATFORM_EXPORT TraceBufferChunk {
  public:
   explicit TraceBufferChunk(uint32_t seq);
 
@@ -142,7 +143,7 @@ class TraceBufferChunk {
   void operator=(const TraceBufferChunk&) = delete;
 };
 
-class TraceBuffer {
+class V8_PLATFORM_EXPORT TraceBuffer {
  public:
   TraceBuffer() {}
   virtual ~TraceBuffer() {}
@@ -178,7 +179,7 @@ enum TraceRecordMode {
   ECHO_TO_CONSOLE,
 };
 
-class TraceConfig {
+class V8_PLATFORM_EXPORT TraceConfig {
  public:
   typedef std::vector<std::string> StringList;
 
@@ -216,7 +217,7 @@ class TraceConfig {
   void operator=(const TraceConfig&) = delete;
 };
 
-class TracingController {
+class V8_PLATFORM_EXPORT TracingController {
  public:
   enum Mode { DISABLED = 0, RECORDING_MODE };
 

src/base/compiler-specific.h

@@ -60,4 +60,46 @@
 #define STATIC_CONST_MEMBER_DEFINITION
 #endif
 
+#if V8_CC_MSVC
+
+#include <sal.h>
+
+// Macros for suppressing and disabling warnings on MSVC.
+//
+// Warning numbers are enumerated at:
+// http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx
+//
+// The warning pragma:
+// http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx
+//
+// Using __pragma instead of #pragma inside macros:
+// http://msdn.microsoft.com/en-us/library/d9x1s805.aspx
+
+// MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and
+// for the next line of the source file.
+#define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress : n))
+
+// Allows exporting a class that inherits from a non-exported base class.
+// This uses suppress instead of push/pop because the delimiter after the
+// declaration (either "," or "{") has to be placed before the pop macro.
+//
+// Example usage:
+// class EXPORT_API Foo : NON_EXPORTED_BASE(public Bar) {
+//
+// MSVC Compiler warning C4275:
+// non dll-interface class 'Bar' used as base for dll-interface class 'Foo'.
+// Note that this is intended to be used only when no access to the base class'
+// static data is done through derived classes or inline methods. For more info,
+// see http://msdn.microsoft.com/en-us/library/3tdb471s(VS.80).aspx
+#define NON_EXPORTED_BASE(code) \
+  MSVC_SUPPRESS_WARNING(4275)   \
+  code
+
+#else  // Not MSVC
+
+#define MSVC_SUPPRESS_WARNING(n)
+#define NON_EXPORTED_BASE(code) code
+
+#endif  // V8_CC_MSVC
+
 #endif  // V8_BASE_COMPILER_SPECIFIC_H_

src/libplatform/default-platform.cc

@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <queue>
 
+#include "include/libplatform/libplatform.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
 #include "src/base/platform/time.h"

src/libplatform/default-platform.h

@@ -11,8 +11,10 @@
 #include <queue>
 #include <vector>
 
+#include "include/libplatform/libplatform-export.h"
 #include "include/libplatform/v8-tracing.h"
 #include "include/v8-platform.h"
+#include "src/base/compiler-specific.h"
 #include "src/base/macros.h"
 #include "src/base/platform/mutex.h"
 #include "src/libplatform/task-queue.h"
@@ -28,7 +30,7 @@ namespace tracing {
 class TracingController;
 }
 
-class DefaultPlatform : public Platform {
+class V8_PLATFORM_EXPORT DefaultPlatform : public NON_EXPORTED_BASE(Platform) {
  public:
   DefaultPlatform();
   virtual ~DefaultPlatform();

src/libplatform/task-queue.h

@@ -7,6 +7,7 @@
 
 #include <queue>
 
+#include "include/libplatform/libplatform-export.h"
 #include "src/base/macros.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/semaphore.h"
@@ -18,7 +19,7 @@ class Task;
 
 namespace platform {
 
-class TaskQueue {
+class V8_PLATFORM_EXPORT TaskQueue {
  public:
   TaskQueue();
   ~TaskQueue();

src/libplatform/worker-thread.h

@@ -7,6 +7,8 @@
 
 #include <queue>
 
+#include "include/libplatform/libplatform-export.h"
+#include "src/base/compiler-specific.h"
 #include "src/base/macros.h"
 #include "src/base/platform/platform.h"
 
@@ -16,7 +18,7 @@ namespace platform {
 
 class TaskQueue;
 
-class WorkerThread : public base::Thread {
+class V8_PLATFORM_EXPORT WorkerThread : public NON_EXPORTED_BASE(base::Thread) {
  public:
   explicit WorkerThread(TaskQueue* queue);
   virtual ~WorkerThread();

src/v8.gyp

@@ -2061,7 +2061,7 @@
     },
     {
       'target_name': 'v8_libplatform',
-      'type': 'static_library',
+      'type': '<(component)',
       'variables': {
         'optimize': 'max',
       },
@@ -2075,6 +2075,7 @@
       ],
       'sources': [
         '../include/libplatform/libplatform.h',
+        '../include/libplatform/libplatform-export.h',
         '../include/libplatform/v8-tracing.h',
         'libplatform/default-platform.cc',
         'libplatform/default-platform.h',
@@ -2096,6 +2097,12 @@
         }, {
           'toolsets': ['target'],
         }],
+        ['component=="shared_library"', {
+          'direct_dependent_settings': {
+            'defines': [ 'USING_V8_PLATFORM_SHARED' ],
+          },
+          'defines': [ 'BUILDING_V8_PLATFORM_SHARED' ],
+        }]
       ],
       'direct_dependent_settings': {
         'include_dirs': [