tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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nsJSInspector.cpp (3235B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 #include "nsJSInspector.h"
      7 #include "mozilla/HoldDropJSObjects.h"
      8 #include "mozilla/SpinEventLoopUntil.h"
      9 #include "mozilla/dom/ScriptSettings.h"
     10 #include "nsTArray.h"
     11 
     12 #define JSINSPECTOR_CONTRACTID "@mozilla.org/jsinspector;1"
     13 
     14 #define JSINSPECTOR_CID \
     15  {0xec5aa99c, 0x7abb, 0x4142, {0xac, 0x5f, 0xaa, 0xb2, 0x41, 0x9e, 0x38, 0xe2}}
     16 
     17 namespace mozilla {
     18 namespace jsinspector {
     19 
     20 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSInspector)
     21  NS_INTERFACE_MAP_ENTRY(nsISupports)
     22  NS_INTERFACE_MAP_ENTRY(nsIJSInspector)
     23 NS_INTERFACE_MAP_END
     24 
     25 NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSInspector)
     26 
     27 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSInspector)
     28 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSInspector)
     29 
     30 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsJSInspector)
     31 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
     32 
     33 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSInspector)
     34  tmp->mRequestors.Clear();
     35  tmp->mLastRequestor = JS::NullValue();
     36 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
     37 
     38 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSInspector)
     39  for (uint32_t i = 0; i < tmp->mRequestors.Length(); ++i) {
     40    NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mRequestors[i])
     41  }
     42  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mLastRequestor)
     43 NS_IMPL_CYCLE_COLLECTION_TRACE_END
     44 
     45 nsJSInspector::nsJSInspector()
     46    : mNestedLoopLevel(0), mRequestors(1), mLastRequestor(JS::NullValue()) {}
     47 
     48 nsJSInspector::~nsJSInspector() {
     49  MOZ_ASSERT(mRequestors.Length() == 0);
     50  MOZ_ASSERT(mLastRequestor.isNull());
     51  mozilla::DropJSObjects(this);
     52 }
     53 
     54 NS_IMETHODIMP
     55 nsJSInspector::EnterNestedEventLoop(JS::Handle<JS::Value> requestor,
     56                                    uint32_t* out) {
     57  nsresult rv = NS_OK;
     58 
     59  mLastRequestor = requestor;
     60  mRequestors.AppendElement(requestor);
     61  mozilla::HoldJSObjects(this);
     62 
     63  mozilla::dom::AutoNoJSAPI nojsapi;
     64 
     65  uint32_t nestLevel = ++mNestedLoopLevel;
     66  if (!SpinEventLoopUntil("nsJSInspector::EnterNestedEventLoop"_ns,
     67                          [&]() { return mNestedLoopLevel < nestLevel; })) {
     68    rv = NS_ERROR_UNEXPECTED;
     69  }
     70 
     71  NS_ASSERTION(mNestedLoopLevel <= nestLevel,
     72               "nested event didn't unwind properly");
     73 
     74  if (mNestedLoopLevel == nestLevel) {
     75    mLastRequestor = mRequestors.ElementAt(--mNestedLoopLevel);
     76  }
     77 
     78  *out = mNestedLoopLevel;
     79  return rv;
     80 }
     81 
     82 NS_IMETHODIMP
     83 nsJSInspector::ExitNestedEventLoop(uint32_t* out) {
     84  if (mNestedLoopLevel > 0) {
     85    mRequestors.RemoveElementAt(--mNestedLoopLevel);
     86    if (mNestedLoopLevel > 0)
     87      mLastRequestor = mRequestors.ElementAt(mNestedLoopLevel - 1);
     88    else
     89      mLastRequestor = JS::NullValue();
     90  } else {
     91    return NS_ERROR_FAILURE;
     92  }
     93 
     94  *out = mNestedLoopLevel;
     95 
     96  return NS_OK;
     97 }
     98 
     99 NS_IMETHODIMP
    100 nsJSInspector::GetEventLoopNestLevel(uint32_t* out) {
    101  *out = mNestedLoopLevel;
    102  return NS_OK;
    103 }
    104 
    105 NS_IMETHODIMP
    106 nsJSInspector::GetLastNestRequestor(JS::MutableHandle<JS::Value> out) {
    107  out.set(mLastRequestor);
    108  return NS_OK;
    109 }
    110 
    111 }  // namespace jsinspector
    112 }  // namespace mozilla