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41ce791926
Replaces the (temporary) compile-time option to pass engine switches with the ability to pass them temporarily at runtime via environment variables. This moves the recently-added code for doing this on Windows to a shared location for use by all desktop embeddings. This is enabled only for debug/profile to avoid potential issues with tampering with released applications, but if there is a need for that in the future it could be added (potentially with a whitelist, as is currently used for Dart VM flags). Temporarily adds a way to enable mirrors as a compile time option, as is already provided in the Linux embedding, to provide a migration path for the one remaining known need for compile-time options that has been raised in flutter/flutter#38569.
42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/shell/platform/common/cpp/engine_switches.h"
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#include <algorithm>
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#include <cstdlib>
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#include <iostream>
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#include <sstream>
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namespace flutter {
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std::vector<std::string> GetSwitchesFromEnvironment() {
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std::vector<std::string> switches;
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// Read engine switches from the environment in debug/profile. If release mode
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// support is needed in the future, it should likely use a whitelist.
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#ifndef FLUTTER_RELEASE
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const char* switch_count_key = "FLUTTER_ENGINE_SWITCHES";
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const int kMaxSwitchCount = 50;
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const char* switch_count_string = std::getenv(switch_count_key);
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int switch_count = std::min(
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kMaxSwitchCount, switch_count_string ? atoi(switch_count_string) : 0);
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for (int i = 1; i <= switch_count; ++i) {
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std::ostringstream switch_key;
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switch_key << "FLUTTER_ENGINE_SWITCH_" << i;
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const char* switch_value = std::getenv(switch_key.str().c_str());
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if (switch_value) {
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std::ostringstream switch_value_as_flag;
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switch_value_as_flag << "--" << switch_value;
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switches.push_back(switch_value_as_flag.str());
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} else {
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std::cerr << switch_count << " keys expected from " << switch_count_key
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<< ", but " << switch_key.str() << " is missing." << std::endl;
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}
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}
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#endif // !FLUTTER_RELEASE
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return switches;
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}
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} // namespace flutter
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