src,lib: prefer internal/options over process._foo

This addresses a couple `TODO` comments and allows us
to remove a number of underscored properties from `process`
(in a semver-major follow-up).

PR-URL: #25063
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: addaleax

lib/internal/bootstrap/node.js

@@ -30,6 +30,7 @@ const {
 const { internalBinding, NativeModule } = loaderExports;
 
 const exceptionHandlerState = { captureFn: null };
+let getOptionValue;
 
 function startup() {
   setupTraceCategoryState();
@@ -105,7 +106,7 @@ function startup() {
     NativeModule.require('internal/inspector_async_hook').setup();
   }
 
-  const { getOptionValue } = NativeModule.require('internal/options');
+  getOptionValue = NativeModule.require('internal/options').getOptionValue;
 
   if (getOptionValue('--help')) {
     NativeModule.require('internal/print_help').print(process.stdout);
@@ -265,8 +266,7 @@ function startExecution() {
   }
 
   // `node --prof-process`
-  // TODO(joyeecheung): use internal/options instead of process.profProcess
-  if (process.profProcess) {
+  if (getOptionValue('--prof-process')) {
     NativeModule.require('internal/v8_prof_processor');
     return;
   }
@@ -288,13 +288,12 @@ function prepareUserCodeExecution() {
   }
 
   // For user code, we preload modules if `-r` is passed
-  // TODO(joyeecheung): use internal/options instead of
-  // process._preload_modules
-  if (process._preload_modules) {
+  const preloadModules = getOptionValue('--require');
+  if (preloadModules) {
     const {
       _preloadModules
     } = NativeModule.require('internal/modules/cjs/loader');
-    _preloadModules(process._preload_modules);
+    _preloadModules(preloadModules);
   }
 }
 
@@ -303,14 +302,12 @@ function executeUserCode() {
   // `--interactive`.
   // Note that the name `forceRepl` is merely an alias of `interactive`
   // in code.
-  // TODO(joyeecheung): use internal/options instead of
-  // process._eval/process._forceRepl
-  if (process._eval != null && !process._forceRepl) {
+  if (getOptionValue('[has_eval_string]') && !getOptionValue('--interactive')) {
     const {
       addBuiltinLibsToObject
     } = NativeModule.require('internal/modules/cjs/helpers');
     addBuiltinLibsToObject(global);
-    evalScript('[eval]', wrapForBreakOnFirstLine(process._eval));
+    evalScript('[eval]', wrapForBreakOnFirstLine(getOptionValue('--eval')));
     return;
   }
 
@@ -324,9 +321,7 @@ function executeUserCode() {
 
     // If user passed `-c` or `--check` arguments to Node, check its syntax
     // instead of actually running the file.
-    // TODO(joyeecheung): use internal/options instead of
-    // process._syntax_check_only
-    if (process._syntax_check_only != null) {
+    if (getOptionValue('--check')) {
       const fs = NativeModule.require('fs');
       // Read the source.
       const filename = CJSModule._resolveFilename(process.argv[1]);
@@ -682,7 +677,7 @@ function evalScript(name, body) {
                   `${JSON.stringify(body)}, { filename: ` +
                   `${JSON.stringify(name)}, displayErrors: true });\n`;
   const result = module._compile(script, `${name}-wrapper`);
-  if (process._print_eval) console.log(result);
+  if (getOptionValue('--print')) console.log(result);
   // Handle any nextTicks added in the first tick of the program.
   process._tickCallback();
 }

src/node.cc

@@ -1002,6 +1002,7 @@ void SetupProcessObject(Environment* env,
                              GetParentProcessId).FromJust());
 
   // -e, --eval
+  // TODO(addaleax): Remove this.
   if (env->options()->has_eval_string) {
     READONLY_PROPERTY(process,
                       "_eval",
@@ -1012,23 +1013,27 @@ void SetupProcessObject(Environment* env,
   }
 
   // -p, --print
+  // TODO(addaleax): Remove this.
   if (env->options()->print_eval) {
     READONLY_PROPERTY(process, "_print_eval", True(env->isolate()));
   }
 
   // -c, --check
+  // TODO(addaleax): Remove this.
   if (env->options()->syntax_check_only) {
     READONLY_PROPERTY(process, "_syntax_check_only", True(env->isolate()));
   }
 
   // -i, --interactive
+  // TODO(addaleax): Remove this.
   if (env->options()->force_repl) {
     READONLY_PROPERTY(process, "_forceRepl", True(env->isolate()));
   }
 
   // -r, --require
-  std::vector<std::string> preload_modules =
-      std::move(env->options()->preload_modules);
+  // TODO(addaleax): Remove this.
+  const std::vector<std::string>& preload_modules =
+      env->options()->preload_modules;
   if (!preload_modules.empty()) {
     Local<Array> array = Array::New(env->isolate());
     for (unsigned int i = 0; i < preload_modules.size(); ++i) {
@@ -1041,8 +1046,6 @@ void SetupProcessObject(Environment* env,
     READONLY_PROPERTY(process,
                       "_preload_modules",
                       array);
-
-    preload_modules.clear();
   }
 
   // --no-deprecation
@@ -1071,6 +1074,7 @@ void SetupProcessObject(Environment* env,
 #endif  // NODE_NO_BROWSER_GLOBALS
 
   // --prof-process
+  // TODO(addaleax): Remove this.
   if (env->options()->prof_process) {
     READONLY_PROPERTY(process, "profProcess", True(env->isolate()));
   }