[windows] Use FML_DCHECK in place of C assert (flutter/engine#38826)

Now that the embedders depend on FML, migrate assertions to FML_DCHECK,
which allows for an explanatory log message to be emitted along with the
assertion.

No tests since no semantic changes are made.

engine/src/flutter/shell/platform/windows/accessibility_bridge_windows.cc

@@ -4,6 +4,7 @@
 
 #include "flutter/shell/platform/windows/accessibility_bridge_windows.h"
 
+#include "flutter/fml/logging.h"
 #include "flutter/shell/platform/windows/flutter_platform_node_delegate_windows.h"
 #include "flutter/third_party/accessibility/ax/platform/ax_platform_node_delegate_base.h"
 
@@ -13,8 +14,8 @@ AccessibilityBridgeWindows::AccessibilityBridgeWindows(
     FlutterWindowsEngine* engine,
     FlutterWindowsView* view)
     : engine_(engine), view_(view) {
-  assert(engine_);
-  assert(view_);
+  FML_DCHECK(engine_);
+  FML_DCHECK(view_);
 }
 
 void AccessibilityBridgeWindows::OnAccessibilityEvent(
@@ -24,7 +25,8 @@ void AccessibilityBridgeWindows::OnAccessibilityEvent(
 
   auto node_delegate =
       GetFlutterPlatformNodeDelegateFromID(ax_node->id()).lock();
-  assert(node_delegate);
+  FML_DCHECK(node_delegate)
+      << "No FlutterPlatformNodeDelegate found for node ID " << ax_node->id();
   std::shared_ptr<FlutterPlatformNodeDelegateWindows> win_delegate =
       std::static_pointer_cast<FlutterPlatformNodeDelegateWindows>(
           node_delegate);

engine/src/flutter/shell/platform/windows/flutter_platform_node_delegate_windows.cc

@@ -6,6 +6,7 @@
 
 #include "flutter/shell/platform/windows/flutter_platform_node_delegate_windows.h"
 
+#include "flutter/fml/logging.h"
 #include "flutter/shell/platform/windows/accessibility_bridge_windows.h"
 #include "flutter/shell/platform/windows/flutter_windows_view.h"
 #include "flutter/third_party/accessibility/ax/ax_clipping_behavior.h"
@@ -18,8 +19,9 @@ FlutterPlatformNodeDelegateWindows::FlutterPlatformNodeDelegateWindows(
     std::weak_ptr<AccessibilityBridge> bridge,
     FlutterWindowsView* view)
     : bridge_(bridge), view_(view) {
-  assert(!bridge_.expired());
-  assert(view_);
+  FML_DCHECK(!bridge_.expired())
+      << "Expired AccessibilityBridge passed to node delegate";
+  FML_DCHECK(view_);
 }
 
 FlutterPlatformNodeDelegateWindows::~FlutterPlatformNodeDelegateWindows() {
@@ -33,13 +35,13 @@ void FlutterPlatformNodeDelegateWindows::Init(std::weak_ptr<OwnerBridge> bridge,
                                               ui::AXNode* node) {
   FlutterPlatformNodeDelegate::Init(bridge, node);
   ax_platform_node_ = ui::AXPlatformNode::Create(this);
-  assert(ax_platform_node_);
+  FML_DCHECK(ax_platform_node_) << "Failed to create AXPlatformNode";
 }
 
 // |ui::AXPlatformNodeDelegate|
 gfx::NativeViewAccessible
 FlutterPlatformNodeDelegateWindows::GetNativeViewAccessible() {
-  assert(ax_platform_node_);
+  FML_DCHECK(ax_platform_node_) << "AXPlatformNode hasn't been created";
   return ax_platform_node_->GetNativeViewAccessible();
 }
 
@@ -58,12 +60,13 @@ gfx::NativeViewAccessible FlutterPlatformNodeDelegateWindows::HitTestSync(
 
   // If any child in this node's subtree contains the point, return that child.
   auto bridge = bridge_.lock();
-  assert(bridge);
+  FML_DCHECK(bridge);
   for (const ui::AXNode* child : GetAXNode()->children()) {
     std::shared_ptr<FlutterPlatformNodeDelegateWindows> win_delegate =
         std::static_pointer_cast<FlutterPlatformNodeDelegateWindows>(
             bridge->GetFlutterPlatformNodeDelegateFromID(child->id()).lock());
-    assert(win_delegate);
+    FML_DCHECK(win_delegate)
+        << "No FlutterPlatformNodeDelegate found for node " << child->id();
     auto hit_view = win_delegate->HitTestSync(screen_physical_pixel_x,
                                               screen_physical_pixel_y);
     if (hit_view) {

engine/src/flutter/shell/platform/windows/flutter_windows.cc

@@ -7,7 +7,6 @@
 #include <io.h>
 
 #include <algorithm>
-#include <cassert>
 #include <chrono>
 #include <cstdlib>
 #include <filesystem>

engine/src/flutter/shell/platform/windows/keyboard_key_embedder_handler.cc

@@ -4,13 +4,13 @@
 
 #include "flutter/shell/platform/windows/keyboard_key_embedder_handler.h"
 
-#include <assert.h>
 #include <windows.h>
 
 #include <chrono>
 #include <iostream>
 #include <string>
 
+#include "flutter/fml/logging.h"
 #include "flutter/shell/platform/windows/keyboard_utils.h"
 
 namespace flutter {
@@ -38,7 +38,7 @@ char _GetBit(char32_t ch, size_t start, size_t end) {
 
 std::string ConvertChar32ToUtf8(char32_t ch) {
   std::string result;
-  assert(0 <= ch && ch <= 0x10FFFF);
+  FML_DCHECK(0 <= ch && ch <= 0x10FFFF) << "Character out of range";
   if (ch <= 0x007F) {
     result.push_back(ch);
   } else if (ch <= 0x07FF) {
@@ -160,8 +160,8 @@ void KeyboardKeyEmbedderHandler::KeyboardHookImpl(
     std::function<void(bool)> callback) {
   const uint64_t physical_key = GetPhysicalKey(scancode, extended);
   const uint64_t logical_key = GetLogicalKey(key, extended, scancode);
-  assert(action == WM_KEYDOWN || action == WM_KEYUP ||
-         action == WM_SYSKEYDOWN || action == WM_SYSKEYUP);
+  FML_DCHECK(action == WM_KEYDOWN || action == WM_KEYUP ||
+             action == WM_SYSKEYDOWN || action == WM_SYSKEYUP);
 
   auto last_logical_record_iter = pressingRecords_.find(physical_key);
   bool had_record = last_logical_record_iter != pressingRecords_.end();
@@ -230,7 +230,7 @@ void KeyboardKeyEmbedderHandler::KeyboardHookImpl(
       if (was_down) {
         // A normal repeated key.
         type = kFlutterKeyEventTypeRepeat;
-        assert(had_record);
+        FML_DCHECK(had_record);
         ConvertUtf32ToUtf8_(character_bytes, character);
         eventual_logical_record = last_logical_record;
         result_logical_key = last_logical_record;
@@ -245,7 +245,7 @@ void KeyboardKeyEmbedderHandler::KeyboardHookImpl(
     } else {
       // A normal down event (whether the system event is a repeat or not).
       type = kFlutterKeyEventTypeDown;
-      assert(!had_record);
+      FML_DCHECK(!had_record);
       ConvertUtf32ToUtf8_(character_bytes, character);
       eventual_logical_record = logical_key;
       result_logical_key = logical_key;
@@ -260,7 +260,7 @@ void KeyboardKeyEmbedderHandler::KeyboardHookImpl(
     } else {
       // A normal up event.
       type = kFlutterKeyEventTypeUp;
-      assert(had_record);
+      FML_DCHECK(had_record);
       // Up events never have character.
       character_bytes[0] = '\0';
       eventual_logical_record = 0;
@@ -278,7 +278,7 @@ void KeyboardKeyEmbedderHandler::KeyboardHookImpl(
     if (record_iter != pressingRecords_.end()) {
       pressingRecords_.erase(record_iter);
     } else {
-      assert(false);
+      FML_DCHECK(false);
     }
   }
 
@@ -375,7 +375,7 @@ void KeyboardKeyEmbedderHandler::SynchronizeCriticalToggledStates(
       // Never seen this key.
       continue;
     }
-    assert(key_info.logical_key != 0);
+    FML_DCHECK(key_info.logical_key != 0);
 
     // Check toggling state first, because it might alter pressing state.
     if (key_info.check_toggled) {
@@ -440,7 +440,7 @@ void KeyboardKeyEmbedderHandler::SynchronizeCriticalPressedStates(
       // Never seen this key.
       continue;
     }
-    assert(key_info.logical_key != 0);
+    FML_DCHECK(key_info.logical_key != 0);
     if (key_info.check_pressed) {
       SHORT true_pressed = get_key_state_(virtual_key) & kStateMaskPressed;
       auto pressing_record_iter = pressingRecords_.find(key_info.physical_key);

engine/src/flutter/shell/platform/windows/keyboard_key_handler.cc

@@ -83,7 +83,8 @@ void KeyboardKeyHandler::ResolvePendingEvent(uint64_t sequence_id,
       PendingEvent& event = **iter;
       event.any_handled = event.any_handled || handled;
       event.unreplied -= 1;
-      assert(event.unreplied >= 0);
+      FML_DCHECK(event.unreplied >= 0)
+          << "Pending events must have unreplied count > 0";
       // If all delegates have replied, report if any of them handled the event.
       if (event.unreplied == 0) {
         std::unique_ptr<PendingEvent> event_ptr = std::move(*iter);
@@ -95,7 +96,8 @@ void KeyboardKeyHandler::ResolvePendingEvent(uint64_t sequence_id,
     }
   }
   // The pending event should always be found.
-  assert(false);
+  FML_LOG(FATAL) << "Could not find pending key event for sequence ID "
+                 << sequence_id;
 }
 
 }  // namespace flutter

engine/src/flutter/shell/platform/windows/keyboard_manager.cc

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <assert.h>
 #include <memory>
 #include <string>
 
@@ -323,7 +322,8 @@ bool KeyboardManager::HandleMessage(UINT const action,
       return !IsSysAction(action);
     }
     default:
-      assert(false);
+      FML_LOG(FATAL) << "No event handler for keyboard event with action "
+                     << action;
   }
   return false;
 }
@@ -336,7 +336,7 @@ void KeyboardManager::ProcessNextEvent() {
   auto pending_event = std::move(pending_events_.front());
   pending_events_.pop_front();
   PerformProcessEvent(std::move(pending_event), [this] {
-    assert(processing_event_);
+    FML_DCHECK(processing_event_);
     processing_event_ = false;
     ProcessNextEvent();
   });
@@ -392,7 +392,7 @@ void KeyboardManager::DispatchText(const PendingEvent& event) {
   // keys defined by `IsPrintable` are certain characters at lower ASCII range.
   // These ASCII control characters are sent as WM_CHAR events for all control
   // key shortcuts.
-  assert(!event.session.empty());
+  FML_DCHECK(!event.session.empty());
   bool is_printable = IsPrintable(event.session.back().wparam);
   bool valid = event.character != 0 && is_printable;
   if (valid) {

engine/src/flutter/shell/platform/windows/keyboard_unittests.cc

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "flutter/fml/logging.h"
 #include "flutter/shell/platform/common/json_message_codec.h"
 #include "flutter/shell/platform/embedder/embedder.h"
 #include "flutter/shell/platform/embedder/test_utils/key_codes.g.h"
@@ -103,7 +104,8 @@ class TestKeyboardManager : public KeyboardManager {
 
  protected:
   void RedispatchEvent(std::unique_ptr<PendingEvent> event) override {
-    assert(!during_redispatch_);
+    FML_DCHECK(!during_redispatch_)
+        << "RedispatchEvent called while already redispatching an event";
     during_redispatch_ = true;
     KeyboardManager::RedispatchEvent(std::move(event));
     during_redispatch_ = false;
@@ -235,7 +237,7 @@ class MockKeyboardManagerDelegate : public KeyboardManager::WindowDelegate,
           break;
         }
         default:
-          assert(false);
+          FML_LOG(FATAL) << "Unhandled KeyboardChange type " << change.type;
       }
     }
   }
@@ -337,7 +339,7 @@ class TestFlutterWindowsView : public FlutterWindowsView {
                      const char* args) {
     rapidjson::Document args_doc;
     args_doc.Parse(args);
-    assert(!args_doc.HasParseError());
+    FML_DCHECK(!args_doc.HasParseError());
 
     rapidjson::Document message_doc(rapidjson::kObjectType);
     auto& allocator = message_doc.GetAllocator();
@@ -473,7 +475,7 @@ class KeyboardTester {
   }
 
   void InjectKeyboardChanges(std::vector<KeyboardChange> changes) {
-    assert(window_ != nullptr);
+    FML_DCHECK(window_ != nullptr);
     window_->InjectKeyboardChanges(changes);
   }
 

engine/src/flutter/shell/platform/windows/keyboard_utils.cc

@@ -4,14 +4,16 @@
 
 #include "keyboard_utils.h"
 
+#include "flutter/fml/logging.h"
+
 namespace flutter {
 
 std::u16string EncodeUtf16(char32_t character) {
   // Algorithm: https://en.wikipedia.org/wiki/UTF-16#Description
   std::u16string result;
   // Invalid value.
-  assert(!(character >= 0xD800 && character <= 0xDFFF) &&
-         !(character > 0x10FFFF));
+  FML_DCHECK(!(character >= 0xD800 && character <= 0xDFFF) &&
+             !(character > 0x10FFFF));
   if ((character >= 0xD800 && character <= 0xDFFF) || (character > 0x10FFFF)) {
     return result;
   }

engine/src/flutter/shell/platform/windows/keyboard_utils.h

@@ -5,8 +5,8 @@
 #ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_WIN32_COMMON_H_
 #define FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_WIN32_COMMON_H_
 
-#include <assert.h>
 #include <stdint.h>
+
 #include <string>
 
 namespace flutter {

engine/src/flutter/shell/platform/windows/platform_handler.cc

@@ -159,7 +159,7 @@ bool ScopedClipboard::HasString() {
 }
 
 std::variant<std::wstring, int> ScopedClipboard::GetString() {
-  assert(opened_);
+  FML_DCHECK(opened_) << "Called GetString when clipboard is closed";
 
   HANDLE data = ::GetClipboardData(CF_UNICODETEXT);
   if (data == nullptr) {
@@ -174,7 +174,7 @@ std::variant<std::wstring, int> ScopedClipboard::GetString() {
 }
 
 int ScopedClipboard::SetString(const std::wstring string) {
-  assert(opened_);
+  FML_DCHECK(opened_) << "Called GetString when clipboard is closed";
   if (!::EmptyClipboard()) {
     return ::GetLastError();
   }

engine/src/flutter/shell/platform/windows/testing/test_binary_messenger.h

@@ -5,11 +5,11 @@
 #ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_TESTING_TEST_BINARY_MESSENGER_H_
 #define FLUTTER_SHELL_PLATFORM_WINDOWS_TESTING_TEST_BINARY_MESSENGER_H_
 
-#include <cassert>
 #include <functional>
 #include <map>
 #include <string>
 
+#include "flutter/fml/logging.h"
 #include "flutter/shell/platform/common/client_wrapper/include/flutter/binary_messenger.h"
 
 namespace flutter {
@@ -53,7 +53,7 @@ class TestBinaryMessenger : public BinaryMessenger {
             size_t message_size,
             BinaryReply reply) const override {
     // If something under test sends a message, the test should be handling it.
-    assert(send_handler_);
+    FML_DCHECK(send_handler_);
     send_handler_(channel, message, message_size, reply);
   }
 

engine/src/flutter/shell/platform/windows/testing/test_keyboard.cc

@@ -3,11 +3,13 @@
 // found in the LICENSE file.
 
 #include "flutter/shell/platform/windows/testing/test_keyboard.h"
-#include "flutter/shell/platform/common/json_message_codec.h"
-#include "flutter/shell/platform/embedder/test_utils/proc_table_replacement.h"
 
 #include <rapidjson/document.h>
 
+#include "flutter/fml/logging.h"
+#include "flutter/shell/platform/common/json_message_codec.h"
+#include "flutter/shell/platform/embedder/test_utils/proc_table_replacement.h"
+
 namespace flutter {
 namespace testing {
 
@@ -205,7 +207,8 @@ void MockMessageQueue::PushBack(const Win32Message* message) {
 }
 
 LRESULT MockMessageQueue::DispatchFront() {
-  assert(!_pending_messages.empty());
+  FML_DCHECK(!_pending_messages.empty())
+      << "Called DispatchFront while pending message queue is empty";
   Win32Message message = _pending_messages.front();
   _pending_messages.pop_front();
   _sent_messages.push_back(message);

engine/src/flutter/shell/platform/windows/text_input_manager.cc

@@ -2,17 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Copyright 2013 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
 #include "flutter/shell/platform/windows/text_input_manager.h"
 
 #include <imm.h>
 
-#include <cassert>
 #include <memory>
 
+#include "flutter/fml/logging.h"
+
 namespace flutter {
 
 // RAII wrapper for the Win32 Input Method Manager context.
@@ -21,7 +18,7 @@ class ImmContext {
   ImmContext(HWND window_handle)
       : context_(::ImmGetContext(window_handle)),
         window_handle_(window_handle) {
-    assert(window_handle);
+    FML_DCHECK(window_handle);
   }
 
   ~ImmContext() {
@@ -39,7 +36,7 @@ class ImmContext {
 
   // Returns the IMM context.
   HIMC get() {
-    assert(context_);
+    FML_DCHECK(context_);
     return context_;
   }