lib,src: remove vm.runInDebugContext()

The V8 API it is based on is deprecated and scheduled for removal later
this year.  Remove it.

PR-URL: https://github.com/nodejs/node/pull/13295
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Robert Jefe Lindstaedt <robert.lindstaedt@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>

doc/api/deprecations.md

@@ -600,10 +600,9 @@ a V8-inspector based CLI debugger available through `node inspect`.
 <a id="DEP0069"></a>
 ### DEP0069: vm.runInDebugContext(string)
 
-Type: Runtime
+Type: End-of-Life
 
-The DebugContext will be removed in V8 soon and will not be available in Node
-10+.
+DebugContext has been removed in V8 and is not available in Node 10+.
 
 *Note*: DebugContext was an experimental API.
 

doc/api/vm.md

@@ -334,36 +334,6 @@ console.log(util.inspect(sandbox));
 // { globalVar: 1024 }
 ```
 
-## vm.runInDebugContext(code)
-<!-- YAML
-added: v0.11.14
-deprecated: v8.0.0
-changes:
-    - version: v9.0.0
-      pr-url: https://github.com/nodejs/node/pull/12815
-      description: Calling this function now emits a deprecation warning.
--->
-
-> Stability: 0 - Deprecated. An alternative is in development.
-
-* `code` {string} The JavaScript code to compile and run.
-
-The `vm.runInDebugContext()` method compiles and executes `code` inside the V8
-debug context. The primary use case is to gain access to the V8 `Debug` object:
-
-```js
-const vm = require('vm');
-const Debug = vm.runInDebugContext('Debug');
-console.log(Debug.findScript(process.emit).name);  // 'events.js'
-console.log(Debug.findScript(process.exit).name);  // 'internal/process.js'
-```
-
-*Note*: The debug context and object are intrinsically tied to V8's debugger
-implementation and may change (or even be removed) without prior warning.
-
-The `Debug` object can also be made available using the V8-specific
-`--expose_debug_as=` [command line option][].
-
 ## vm.runInNewContext(code[, sandbox][, options])
 <!-- YAML
 added: v0.3.1
@@ -517,7 +487,6 @@ associating it with the `sandbox` object is what this document refers to as
 [`vm.runInContext()`]: #vm_vm_runincontext_code_contextifiedsandbox_options
 [`vm.runInThisContext()`]: #vm_vm_runinthiscontext_code_options
 [V8 Embedder's Guide]: https://github.com/v8/v8/wiki/Embedder's%20Guide#contexts
-[command line option]: cli.html
 [contextified]: #vm_what_does_it_mean_to_contextify_an_object
 [global object]: https://es5.github.io/#x15.1
 [indirect `eval()` call]: https://es5.github.io/#x10.4.2

lib/module.js

@@ -629,10 +629,6 @@ Module.prototype._compile = function(content, filename) {
     if (filename === resolvedArgv) {
       delete process._breakFirstLine;
       inspectorWrapper = process.binding('inspector').callAndPauseOnStart;
-      if (!inspectorWrapper) {
-        const Debug = vm.runInDebugContext('Debug');
-        Debug.setBreakPoint(compiledWrapper, 0, 0);
-      }
     }
   }
   var dirname = path.dirname(filename);

lib/vm.js

@@ -27,7 +27,6 @@ const {
 
   makeContext,
   isContext,
-  runInDebugContext: runInDebugContext_
 } = process.binding('contextify');
 
 // The binding provides a few useful primitives:
@@ -105,19 +104,6 @@ function sigintHandlersWrap(fn, thisArg, argsArray) {
   }
 }
 
-let runInDebugContextWarned = false;
-function runInDebugContext(code) {
-  if (runInDebugContextWarned === false) {
-    runInDebugContextWarned = true;
-    process.emitWarning(
-      'DebugContext has been deprecated and will be removed in a ' +
-      'future version.',
-      'DeprecationWarning',
-      'DEP0069');
-  }
-  return runInDebugContext_(code);
-}
-
 function runInContext(code, contextifiedSandbox, options) {
   if (typeof options === 'string') {
     options = {
@@ -156,7 +142,6 @@ module.exports = {
   Script,
   createContext,
   createScript,
-  runInDebugContext,
   runInContext,
   runInNewContext,
   runInThisContext,

src/node_contextify.cc

@@ -22,7 +22,6 @@
 #include "node_internals.h"
 #include "node_watchdog.h"
 #include "base_object-inl.h"
-#include "v8-debug.h"
 
 namespace node {
 
@@ -30,7 +29,6 @@ using v8::Array;
 using v8::ArrayBuffer;
 using v8::Boolean;
 using v8::Context;
-using v8::Debug;
 using v8::EscapableHandleScope;
 using v8::External;
 using v8::Function;
@@ -218,42 +216,11 @@ class ContextifyContext {
     function_template->InstanceTemplate()->SetInternalFieldCount(1);
     env->set_script_data_constructor_function(function_template->GetFunction());
 
-    env->SetMethod(target, "runInDebugContext", RunInDebugContext);
     env->SetMethod(target, "makeContext", MakeContext);
     env->SetMethod(target, "isContext", IsContext);
   }
 
 
-  static void RunInDebugContext(const FunctionCallbackInfo<Value>& args) {
-    Local<String> script_source(args[0]->ToString(args.GetIsolate()));
-    if (script_source.IsEmpty())
-      return;  // Exception pending.
-    Local<Context> debug_context = Debug::GetDebugContext(args.GetIsolate());
-    Environment* env = Environment::GetCurrent(args);
-    if (debug_context.IsEmpty()) {
-      // Force-load the debug context.
-      auto dummy_event_listener = [] (const Debug::EventDetails&) {};
-      Debug::SetDebugEventListener(args.GetIsolate(), dummy_event_listener);
-      debug_context = Debug::GetDebugContext(args.GetIsolate());
-      CHECK(!debug_context.IsEmpty());
-      // Ensure that the debug context has an Environment assigned in case
-      // a fatal error is raised.  The fatal exception handler in node.cc
-      // is not equipped to deal with contexts that don't have one and
-      // can't easily be taught that due to a deficiency in the V8 API:
-      // there is no way for the embedder to tell if the data index is
-      // in use.
-      const int index = Environment::kContextEmbedderDataIndex;
-      debug_context->SetAlignedPointerInEmbedderData(index, env);
-    }
-
-    Context::Scope context_scope(debug_context);
-    MaybeLocal<Script> script = Script::Compile(debug_context, script_source);
-    if (script.IsEmpty())
-      return;  // Exception pending.
-    args.GetReturnValue().Set(script.ToLocalChecked()->Run());
-  }
-
-
   static void MakeContext(const FunctionCallbackInfo<Value>& args) {
     Environment* env = Environment::GetCurrent(args);
 

test/fixtures/vm-run-in-debug-context.js

@@ -1,4 +0,0 @@
-if (process.argv[2] === 'handle-fatal-exception')
-  process._fatalException = process.exit.bind(null, 42);
-
-require('vm').runInDebugContext('*');

test/parallel/test-util-inspect.js

@@ -19,12 +19,14 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+// Flags: --expose_internals
 'use strict';
 const common = require('../common');
 const assert = require('assert');
 const JSStream = process.binding('js_stream').JSStream;
 const util = require('util');
 const vm = require('vm');
+const { previewMapIterator } = require('internal/v8');
 
 assert.strictEqual(util.inspect(1), '1');
 assert.strictEqual(util.inspect(false), 'false');
@@ -442,11 +444,9 @@ assert.strictEqual(util.inspect(-0), '-0');
 
 // test for Array constructor in different context
 {
-  const Debug = vm.runInDebugContext('Debug');
   const map = new Map();
   map.set(1, 2);
-  const mirror = Debug.MakeMirror(map.entries(), true);
-  const vals = mirror.preview();
+  const vals = previewMapIterator(map.entries(), 100);
   const valsOutput = [];
   for (const o of vals) {
     valsOutput.push(o);

test/parallel/test-vm-debug-context.js

@@ -1,123 +0,0 @@
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-/* eslint-disable no-debugger */
-'use strict';
-const common = require('../common');
-const assert = require('assert');
-const vm = require('vm');
-const { spawn } = require('child_process');
-const fixtures = require('../common/fixtures');
-
-const msg = 'DebugContext has been deprecated and will be removed in ' +
-            'a future version.';
-common.expectWarning('DeprecationWarning', msg);
-vm.runInDebugContext();
-
-assert.throws(function() {
-  vm.runInDebugContext('*');
-}, /SyntaxError/);
-
-assert.throws(function() {
-  vm.runInDebugContext({ toString: assert.fail });
-}, /AssertionError/);
-
-assert.throws(function() {
-  vm.runInDebugContext('throw URIError("BAM")');
-}, /URIError/);
-
-assert.throws(function() {
-  vm.runInDebugContext('(function(f) { f(f) })(function(f) { f(f) })');
-}, /RangeError/);
-
-assert.strictEqual(typeof vm.runInDebugContext('this'), 'object');
-assert.strictEqual(typeof vm.runInDebugContext('Debug'), 'object');
-
-assert.strictEqual(vm.runInDebugContext(), undefined);
-assert.strictEqual(vm.runInDebugContext(0), 0);
-assert.strictEqual(vm.runInDebugContext(null), null);
-assert.strictEqual(vm.runInDebugContext(undefined), undefined);
-
-// See https://github.com/nodejs/node/issues/1190, accessing named interceptors
-// and accessors inside a debug event listener should not crash.
-{
-  const Debug = vm.runInDebugContext('Debug');
-  let breaks = 0;
-
-  function ondebugevent(evt, exc) {
-    if (evt !== Debug.DebugEvent.Break) return;
-    exc.frame(0).evaluate('process.env').properties();  // Named interceptor.
-    exc.frame(0).evaluate('process.title').getTruncatedValue();  // Accessor.
-    breaks += 1;
-  }
-
-  function breakpoint() {
-    debugger;
-  }
-
-  assert.strictEqual(breaks, 0);
-  Debug.setListener(ondebugevent);
-  assert.strictEqual(breaks, 0);
-  breakpoint();
-  assert.strictEqual(breaks, 1);
-}
-
-// Can set listeners and breakpoints on a single line file
-{
-  const Debug = vm.runInDebugContext('Debug');
-  const fn = require(fixtures.path('exports-function-with-param'));
-  let called = false;
-
-  Debug.setListener(function(event, state, data) {
-    if (data.constructor.name === 'BreakEvent') {
-      called = true;
-    }
-  });
-
-  Debug.setBreakPoint(fn);
-  fn('foo');
-  assert.strictEqual(Debug.showBreakPoints(fn), '(arg) { [B0]return arg; }');
-  assert.strictEqual(called, true);
-}
-
-// See https://github.com/nodejs/node/issues/1190, fatal errors should not
-// crash the process.
-const script = fixtures.path('vm-run-in-debug-context.js');
-let proc = spawn(process.execPath, [script]);
-const data = [];
-proc.stdout.on('data', common.mustNotCall());
-proc.stderr.on('data', data.push.bind(data));
-proc.stderr.once('end', common.mustCall(function() {
-  const haystack = Buffer.concat(data).toString('utf8');
-  assert(/SyntaxError: Unexpected token \*/.test(haystack));
-}));
-proc.once('exit', common.mustCall(function(exitCode, signalCode) {
-  assert.strictEqual(exitCode, 1);
-  assert.strictEqual(signalCode, null);
-}));
-
-proc = spawn(process.execPath, [script, 'handle-fatal-exception']);
-proc.stdout.on('data', common.mustNotCall());
-proc.stderr.on('data', common.mustNotCall());
-proc.once('exit', common.mustCall(function(exitCode, signalCode) {
-  assert.strictEqual(exitCode, 42);
-  assert.strictEqual(signalCode, null);
-}));

test/tick-processor/test-tick-processor-cpp-core.js

@@ -14,9 +14,9 @@ if (common.isWindows ||
 const base = require('./tick-processor-base.js');
 
 base.runTest({
-  pattern: /RunInDebugContext/,
+  pattern: /MakeContext/,
   code: `function f() {
-           require('vm').runInDebugContext('Debug');
+           require('vm').createContext({});
            setImmediate(function() { f(); });
          };
          f();`

test/tick-processor/test-tick-processor-preprocess-flag.js

@@ -16,7 +16,7 @@ const base = require('./tick-processor-base.js');
 base.runTest({
   pattern: /^{/,
   code: `function f() {
-           require('vm').runInDebugContext('Debug');
+           require('vm').createContext({});
            setImmediate(function() { f(); });
          };
          f();`,