process: specialize building and storage of process.config

Instead of treating config.gypi as a JavaScript file, specialize
the processing in js2c and make the serialized result a real JSON
string (with 'true' and 'false' converted to boolean values) so
we don't have to use a custom deserializer during bootstrap.

In addition, store the JSON string separately in NativeModuleLoader,
and keep it separate from the map of the builtin source code, so
we don't have to put it onto `NativeModule._source` and delete it
later, though we still preserve it in `process.binding('natives')`,
which we don't use anymore.

This patch also makes the map of builtin source code and the
config.gypi string available through side-effect-free getters
in C++.

PR-URL: https://github.com/nodejs/node/pull/24816
Reviewed-By: Gus Caplan <me@gus.host>

1 files changed, 26 insertions, 12 deletions

diff --git a/tools/js2c.py b/tools/js2c.py
index e9a5204773..d103a3d236 100755
--- a/tools/js2c.py
+++ b/tools/js2c.py
@@ -193,6 +193,10 @@ void NativeModuleLoader::LoadJavaScriptHash() {{
   {hash_initializers}
 }}
 
+UnionBytes NativeModuleLoader::GetConfig() {{
+  return UnionBytes(config_raw, arraysize(config_raw));  // config.gypi
+}}
+
 }}  // namespace native_module
 
 }}  // namespace node
@@ -248,21 +252,23 @@ def JS2C(source, target):
   definitions = []
   initializers = []
   hash_initializers = []
+  config_initializers = []
 
-  def AddModule(module, source):
-    var = '%s_raw' % (module.replace('-', '_').replace('/', '_'))
-    source_hash = hashlib.sha256(source).hexdigest()
-
+  def GetDefinition(var, source):
     # Treat non-ASCII as UTF-8 and convert it to UTF-16.
     if any(ord(c) > 127 for c in source):
       source = map(ord, source.decode('utf-8').encode('utf-16be'))
       source = [source[i] * 256 + source[i+1] for i in xrange(0, len(source), 2)]
       source = ToCArray(source)
-      definition = TWO_BYTE_STRING.format(var=var, data=source)
+      return TWO_BYTE_STRING.format(var=var, data=source)
     else:
       source = ToCArray(map(ord, source), step=20)
-      definition = ONE_BYTE_STRING.format(var=var, data=source)
+      return ONE_BYTE_STRING.format(var=var, data=source)
 
+  def AddModule(module, source):
+    var = '%s_raw' % (module.replace('-', '_').replace('/', '_'))
+    source_hash = hashlib.sha256(source).hexdigest()
+    definition = GetDefinition(var, source)
     initializer = INITIALIZER.format(module=module,
                                      var=var)
     hash_initializer = HASH_INITIALIZER.format(module=module,
@@ -292,11 +298,17 @@ def JS2C(source, target):
 
     # if its a gypi file we're going to want it as json
     # later on anyway, so get it out of the way now
-    if name.endswith(".gypi"):
+    if name.endswith('.gypi'):
+      # Currently only config.gypi is allowed
+      assert name == 'config.gypi'
+      lines = re.sub(r'\'true\'', 'true', lines)
+      lines = re.sub(r'\'false\'', 'false', lines)
       lines = re.sub(r'#.*?\n', '', lines)
       lines = re.sub(r'\'', '"', lines)
-
-    AddModule(name.split('.', 1)[0], lines)
+      definition = GetDefinition('config_raw', lines)
+      definitions.append(definition)
+    else:
+      AddModule(name.split('.', 1)[0], lines)
 
     # Add deprecated aliases for deps without 'deps/'
     if deprecated_deps is not None:
@@ -306,9 +318,11 @@ def JS2C(source, target):
 
   # Emit result
   output = open(str(target[0]), "w")
-  output.write(TEMPLATE.format(definitions=''.join(definitions),
-                               initializers=''.join(initializers),
-                               hash_initializers=''.join(hash_initializers)))
+  output.write(
+    TEMPLATE.format(definitions=''.join(definitions),
+                    initializers=''.join(initializers),
+                    hash_initializers=''.join(hash_initializers),
+                    config_initializers=''.join(config_initializers)))
   output.close()
 
 def main():