build: configure --shared

Add configure flag for building a shared library that can be
embedded in other applications (like Electron). Add flags
--without-bundled-v8 and --without-v8-platform to control V8
dependencies used.

PR-URL: https://github.com/nodejs/node/pull/6994
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Fedor Indutny <fedor@indutny.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

 Conflicts:
	src/node.cc

9 files changed, 212 insertions, 36 deletions

diff --git a/common.gypi b/common.gypi
index 8da603d00f..a892c2d6e3 100644
--- a/common.gypi
+++ b/common.gypi
@@ -11,6 +11,11 @@
     'msvs_multi_core_compile': '0',   # we do enable multicore compiles, but not using the V8 way
     'python%': 'python',
 
+    'node_shared%': 'false',
+    'node_use_v8_platform%': 'true',
+    'node_use_bundled_v8%': 'true',
+    'node_module_version%': '',
+
     'node_tag%': '',
     'uv_library%': 'static_library',
 
@@ -290,6 +295,9 @@
             ],
             'ldflags!': [ '-rdynamic' ],
           }],
+          [ 'node_shared=="true"', {
+            'cflags': [ '-fPIC' ],
+          }],
         ],
       }],
       [ 'OS=="android"', {
diff --git a/configure b/configure
index d622a6f062..879c12b496 100755
--- a/configure
+++ b/configure
@@ -24,6 +24,10 @@ from gyp.common import GetFlavor
 sys.path.insert(0, os.path.join(root_dir, 'tools', 'configure.d'))
 import nodedownload
 
+# imports in tools/
+sys.path.insert(0, os.path.join(root_dir, 'tools'))
+import getmoduleversion
+
 # parse our options
 parser = optparse.OptionParser()
 
@@ -420,6 +424,26 @@ parser.add_option('--without-inspector',
     dest='without_inspector',
     help='disable experimental V8 inspector support')
 
+parser.add_option('--shared',
+    action='store_true',
+    dest='shared',
+    help='compile shared library for embedding node in another project. ' +
+         '(This mode is not officially supported for regular applications)')
+
+parser.add_option('--without-v8-platform',
+    action='store_true',
+    dest='without_v8_platform',
+    default=False,
+    help='do not initialize v8 platform during node.js startup. ' +
+         '(This mode is not officially supported for regular applications)')
+
+parser.add_option('--without-bundled-v8',
+    action='store_true',
+    dest='without_bundled_v8',
+    default=False,
+    help='do not use V8 includes from the bundled deps folder. ' +
+         '(This mode is not officially supported for regular applications)')
+
 (options, args) = parser.parse_args()
 
 # Expand ~ in the install prefix now, it gets written to multiple files.
@@ -810,6 +834,10 @@ def configure_node(o):
     o['variables']['node_target_type'] = 'static_library'
 
   o['variables']['node_no_browser_globals'] = b(options.no_browser_globals)
+  o['variables']['node_shared'] = b(options.shared)
+  o['variables']['node_use_v8_platform'] = b(not options.without_v8_platform)
+  o['variables']['node_use_bundled_v8'] = b(not options.without_bundled_v8)
+  o['variables']['node_module_version'] = int(getmoduleversion.get_version())
 
   if options.linked_module:
     o['variables']['library_files'] = options.linked_module
diff --git a/node.gyp b/node.gyp
index c3f591351d..c14f57e94a 100644
--- a/node.gyp
+++ b/node.gyp
@@ -6,6 +6,10 @@
     'node_use_etw%': 'false',
     'node_use_perfctr%': 'false',
     'node_no_browser_globals%': 'false',
+    'node_use_v8_platform%': 'true',
+    'node_use_bundled_v8%': 'true',
+    'node_shared%': 'false',
+    'node_module_version%': '',
     'node_shared_zlib%': 'false',
     'node_shared_http_parser%': 'false',
     'node_shared_cares%': 'false',
@@ -14,7 +18,6 @@
     'node_shared_openssl%': 'false',
     'node_v8_options%': '',
     'node_enable_v8_vtunejit%': 'false',
-    'node_target_type%': 'executable',
     'node_core_target_name%': 'node',
     'library_files': [
       'lib/internal/bootstrap_node.js',
@@ -100,6 +103,13 @@
       'deps/v8/tools/SourceMap.js',
       'deps/v8/tools/tickprocessor-driver.js',
     ],
+    'conditions': [
+      [ 'node_shared=="true"', {
+        'node_target_type%': 'shared_library',
+      }, {
+        'node_target_type%': 'executable',
+      }],
+    ],
   },
 
   'targets': [
@@ -109,8 +119,6 @@
 
       'dependencies': [
         'node_js2c#host',
-        'deps/v8/tools/gyp/v8.gyp:v8',
-        'deps/v8/tools/gyp/v8.gyp:v8_libplatform'
       ],
 
       'include_dirs': [
@@ -118,7 +126,6 @@
         'tools/msvs/genfiles',
         'deps/uv/src/ares',
         '<(SHARED_INTERMEDIATE_DIR)', # for node_natives.h
-        'deps/v8' # include/v8_platform.h
       ],
 
       'sources': [
@@ -217,6 +224,42 @@
 
 
       'conditions': [
+        [ 'node_shared=="false"', {
+          'msvs_settings': {
+            'VCManifestTool': {
+              'EmbedManifest': 'true',
+              'AdditionalManifestFiles': 'src/res/node.exe.extra.manifest'
+            }
+          },
+        }, {
+          'defines': [
+            'NODE_SHARED_MODE',
+          ],
+          'conditions': [
+            [ 'node_module_version!=""', {
+              'product_extension': 'so.<(node_module_version)',
+            }]
+          ],
+        }],
+        [ 'node_use_bundled_v8=="true"', {
+          'include_dirs': [
+            'deps/v8', # include/v8_platform.h
+          ],
+
+          'dependencies': [
+            'deps/v8/tools/gyp/v8.gyp:v8',
+            'deps/v8/tools/gyp/v8.gyp:v8_libplatform'
+          ],
+        }],
+        [ 'node_use_v8_platform=="true"', {
+          'defines': [
+            'NODE_USE_V8_PLATFORM=1',
+          ],
+        }, {
+          'defines': [
+            'NODE_USE_V8_PLATFORM=0',
+          ],
+        }],
         [ 'node_tag!=""', {
           'defines': [ 'NODE_TAG="<(node_tag)"' ],
         }],
@@ -245,7 +288,8 @@
               'defines': [ 'NODE_HAVE_SMALL_ICU=1' ],
           }]],
         }],
-        [ 'node_enable_v8_vtunejit=="true" and (target_arch=="x64" or \
+        [ 'node_use_bundled_v8=="true" and \
+           node_enable_v8_vtunejit=="true" and (target_arch=="x64" or \
            target_arch=="ia32" or target_arch=="x32")', {
           'defines': [ 'NODE_ENABLE_VTUNE_PROFILING' ],
           'dependencies': [
@@ -308,7 +352,7 @@
                     ],
                   },
                   'conditions': [
-                    ['OS in "linux freebsd"', {
+                    ['OS in "linux freebsd" and node_shared=="false"', {
                       'ldflags': [
                         '-Wl,--whole-archive <(PRODUCT_DIR)/<(OPENSSL_PRODUCT)',
                         '-Wl,--no-whole-archive',
@@ -395,7 +439,7 @@
         [ 'node_no_browser_globals=="true"', {
           'defines': [ 'NODE_NO_BROWSER_GLOBALS' ],
         } ],
-        [ 'v8_postmortem_support=="true"', {
+        [ 'node_use_bundled_v8=="true" and v8_postmortem_support=="true"', {
           'dependencies': [ 'deps/v8/tools/gyp/v8.gyp:postmortem-metadata' ],
           'conditions': [
             # -force_load is not applicable for the static library
@@ -478,7 +522,7 @@
             'NODE_PLATFORM="sunos"',
           ],
         }],
-        [ 'OS=="freebsd" or OS=="linux"', {
+        [ '(OS=="freebsd" or OS=="linux") and node_shared=="false"', {
           'ldflags': [ '-Wl,-z,noexecstack',
                        '-Wl,--whole-archive <(V8_BASE)',
                        '-Wl,--no-whole-archive' ]
@@ -487,12 +531,6 @@
           'ldflags': [ '-Wl,-M,/usr/lib/ld/map.noexstk' ],
         }],
       ],
-      'msvs_settings': {
-        'VCManifestTool': {
-          'EmbedManifest': 'true',
-          'AdditionalManifestFiles': 'src/res/node.exe.extra.manifest'
-        }
-      },
     },
     # generate ETW header and resource files
     {
@@ -718,8 +756,6 @@
         'deps/http_parser/http_parser.gyp:http_parser',
         'deps/gtest/gtest.gyp:gtest',
         'deps/uv/uv.gyp:libuv',
-        'deps/v8/tools/gyp/v8.gyp:v8',
-        'deps/v8/tools/gyp/v8.gyp:v8_libplatform'
       ],
       'include_dirs': [
         'src',
@@ -750,7 +786,18 @@
             'src/inspector_socket.cc',
             'test/cctest/test_inspector_socket.cc'
           ]
-        }]
+        }],
+        [ 'node_use_v8_platform=="true"', {
+          'dependencies': [
+            'deps/v8/tools/gyp/v8.gyp:v8_libplatform',
+          ],
+        }],
+        [ 'node_use_bundled_v8=="true"', {
+          'dependencies': [
+            'deps/v8/tools/gyp/v8.gyp:v8',
+            'deps/v8/tools/gyp/v8.gyp:v8_libplatform'
+          ],
+        }],
       ]
     }
   ], # end targets
diff --git a/src/node.cc b/src/node.cc
index 3a31242957..8cadf18f8d 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -39,7 +39,9 @@
 #include "string_bytes.h"
 #include "util.h"
 #include "uv.h"
+#if NODE_USE_V8_PLATFORM
 #include "libplatform/libplatform.h"
+#endif  // NODE_USE_V8_PLATFORM
 #include "v8-debug.h"
 #include "v8-profiler.h"
 #include "zlib.h"
@@ -184,7 +186,42 @@ static uv_async_t dispatch_debug_messages_async;
 
 static Mutex node_isolate_mutex;
 static v8::Isolate* node_isolate;
-static v8::Platform* default_platform;
+
+static struct {
+#if NODE_USE_V8_PLATFORM
+  void Initialize(int thread_pool_size) {
+    platform_ = v8::platform::CreateDefaultPlatform(thread_pool_size);
+    V8::InitializePlatform(platform_);
+  }
+
+  void PumpMessageLoop(Isolate* isolate) {
+    v8::platform::PumpMessageLoop(platform_, isolate);
+  }
+
+  void Dispose() {
+    delete platform_;
+    platform_ = nullptr;
+  }
+
+#if HAVE_INSPECTOR
+  void StartInspector(Environment *env, int port, bool wait) {
+    env->inspector_agent()->Start(platform_, port, wait);
+  }
+#endif  // HAVE_INSPECTOR
+
+  v8::Platform* platform_;
+#else  // !NODE_USE_V8_PLATFORM
+  void Initialize(int thread_pool_size) {}
+  void PumpMessageLoop(Isolate* isolate) {}
+  void Dispose() {}
+#if HAVE_INSPECTOR
+  void StartInspector(Environment *env, int port, bool wait) {
+    env->ThrowError("Node compiled with NODE_USE_V8_PLATFORM=0");
+  }
+#endif  // HAVE_INSPECTOR
+
+#endif  // !NODE_USE_V8_PLATFORM
+} v8_platform;
 
 #ifdef __POSIX__
 static uv_sem_t debug_semaphore;
@@ -3736,7 +3773,7 @@ static void StartDebug(Environment* env, bool wait) {
   CHECK(!debugger_running);
 #if HAVE_INSPECTOR
   if (use_inspector) {
-    env->inspector_agent()->Start(default_platform, inspector_port, wait);
+    v8_platform.StartInspector(env, inspector_port, wait);
     debugger_running = true;
   } else {
 #endif
@@ -4467,11 +4504,11 @@ static void StartNodeInstance(void* arg) {
       SealHandleScope seal(isolate);
       bool more;
       do {
-        v8::platform::PumpMessageLoop(default_platform, isolate);
+        v8_platform.PumpMessageLoop(isolate);
         more = uv_run(env->event_loop(), UV_RUN_ONCE);
 
         if (more == false) {
-          v8::platform::PumpMessageLoop(default_platform, isolate);
+          v8_platform.PumpMessageLoop(isolate);
           EmitBeforeExit(env);
 
           // Emit `beforeExit` if the loop became alive either after emitting
@@ -4537,8 +4574,7 @@ int Start(int argc, char** argv) {
   V8::SetEntropySource(crypto::EntropySource);
 #endif
 
-  default_platform = v8::platform::CreateDefaultPlatform(v8_thread_pool_size);
-  V8::InitializePlatform(default_platform);
+  v8_platform.Initialize(v8_thread_pool_size);
   V8::Initialize();
 
   int exit_code = 1;
@@ -4555,8 +4591,7 @@ int Start(int argc, char** argv) {
   }
   V8::Dispose();
 
-  delete default_platform;
-  default_platform = nullptr;
+  v8_platform.Dispose();
 
   delete[] exec_argv;
   exec_argv = nullptr;
diff --git a/src/node.h b/src/node.h
index 42c5ac59d7..6d12567f89 100644
--- a/src/node.h
+++ b/src/node.h
@@ -415,17 +415,23 @@ extern "C" NODE_EXTERN void node_module_register(void* mod);
 # define NODE_MODULE_EXPORT __attribute__((visibility("default")))
 #endif
 
+#ifdef NODE_SHARED_MODE
+# define NODE_CTOR_PREFIX
+#else
+# define NODE_CTOR_PREFIX static
+#endif
+
 #if defined(_MSC_VER)
 #pragma section(".CRT$XCU", read)
 #define NODE_C_CTOR(fn)                                               \
-  static void __cdecl fn(void);                                       \
+  NODE_CTOR_PREFIX void __cdecl fn(void);                             \
   __declspec(dllexport, allocate(".CRT$XCU"))                         \
       void (__cdecl*fn ## _)(void) = fn;                              \
-  static void __cdecl fn(void)
+  NODE_CTOR_PREFIX void __cdecl fn(void)
 #else
 #define NODE_C_CTOR(fn)                                               \
-  static void fn(void) __attribute__((constructor));                  \
-  static void fn(void)
+  NODE_CTOR_PREFIX void fn(void) __attribute__((constructor));        \
+  NODE_CTOR_PREFIX void fn(void)
 #endif
 
 #define NODE_MODULE_X(modname, regfunc, priv, flags)                  \
diff --git a/test/parallel/test-module-version.js b/test/parallel/test-module-version.js
new file mode 100644
index 0000000000..7f96e8bb60
--- /dev/null
+++ b/test/parallel/test-module-version.js
@@ -0,0 +1,10 @@
+'use strict';
+require('../common');
+var assert = require('assert');
+
+// check for existence
+assert(process.config.variables.hasOwnProperty('node_module_version'));
+
+// ensure that `node_module_version` is an Integer > 0
+assert(Number.isInteger(process.config.variables.node_module_version));
+assert(process.config.variables.node_module_version > 0);
diff --git a/tools/getmoduleversion.py b/tools/getmoduleversion.py
new file mode 100644
index 0000000000..fb86ba1fa9
--- /dev/null
+++ b/tools/getmoduleversion.py
@@ -0,0 +1,24 @@
+from __future__ import print_function
+import os
+import re
+
+def get_version():
+  node_version_h = os.path.join(
+    os.path.dirname(__file__),
+    '..',
+    'src',
+    'node_version.h')
+
+  f = open(node_version_h)
+
+  regex = '^#define NODE_MODULE_VERSION [0-9]+'
+
+  for line in f:
+    if re.match(regex, line):
+      major = line.split()[2]
+      return major
+  
+  raise Exception('Could not find pattern matching %s' % regex)
+
+if __name__ == '__main__':
+  print(get_version())
diff --git a/tools/getnodeversion.py b/tools/getnodeversion.py
index 766e4f60dc..f2032cccef 100644
--- a/tools/getnodeversion.py
+++ b/tools/getnodeversion.py
@@ -1,16 +1,20 @@
-import os,re
+import os
+import re
 
-node_version_h = os.path.join(os.path.dirname(__file__), '..', 'src',
+node_version_h = os.path.join(
+    os.path.dirname(__file__),
+    '..',
+    'src',
     'node_version.h')
 
 f = open(node_version_h)
 
 for line in f:
-  if re.match('#define NODE_MAJOR_VERSION', line):
+  if re.match('^#define NODE_MAJOR_VERSION', line):
     major = line.split()[2]
-  if re.match('#define NODE_MINOR_VERSION', line):
+  if re.match('^#define NODE_MINOR_VERSION', line):
     minor = line.split()[2]
-  if re.match('#define NODE_PATCH_VERSION', line):
+  if re.match('^#define NODE_PATCH_VERSION', line):
     patch = line.split()[2]
 
 print '%(major)s.%(minor)s.%(patch)s'% locals()
diff --git a/tools/install.py b/tools/install.py
index f3fa4fe898..a3986c5033 100755
--- a/tools/install.py
+++ b/tools/install.py
@@ -6,6 +6,7 @@ import os
 import re
 import shutil
 import sys
+from getmoduleversion import get_version
 
 # set at init time
 node_prefix = '/usr/local' # PREFIX variable from Makefile
@@ -107,9 +108,22 @@ def subdir_files(path, dest, action):
 
 def files(action):
   is_windows = sys.platform == 'win32'
+  output_file = 'node'
+  output_prefix = 'out/Release/'
 
-  exeext = '.exe' if is_windows else ''
-  action(['out/Release/node' + exeext], 'bin/node' + exeext)
+  if 'false' == variables.get('node_shared'):
+    if is_windows:
+      output_file += '.exe'
+  else:
+    if is_windows:
+      output_file += '.dll'
+    else:
+      # GYP will output to lib.target, this is hardcoded in its source,
+      # see the _InstallableTargetInstallPath function.
+      output_prefix += 'lib.target/'
+      output_file = 'lib' + output_file + '.so.' + get_version()
+
+  action([output_prefix + output_file], 'bin/' + output_file)
 
   if 'true' == variables.get('node_use_dtrace'):
     action(['out/Release/node.d'], 'lib/dtrace/node.d')