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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_COMMON_DEBUG_UTILS_H_
#define CONTENT_COMMON_DEBUG_UTILS_H_
namespace content {
// There are cases that require debugging of complex multiprocess scenarios in
// which tools such as DumpWithoutCrashing and tracing can be useful.
// The goal of this enum is to be able to log to UMA when such complex scenarios
// occur with two goals:
// * Get an idea of the magnitute of the problem, since just crash reports
// cannot express this, given they are throttled client side.
// * For clients which have continuous tracing enabled, upload a snapshot of the
// trace to aid understanding of the interactions between all processes.
//
// Usage: Add a new value to the DebugScenario enum below and call
// CaptureTraceForNavigationDebugScenario(YOUR_NEW_ENUM_VALUE);
// from the location where you are hitting the scenario you care about.
//
// NOTE: Do not renumber elements in this list. Add new entries at the end.
// Items may be renamed but do not change the values. We rely on the enum values
// in histograms.
enum class DebugScenario {
kDebugSameDocNavigationDocIdMismatch = 1,
// A non-main frame navigation with old_page_info set was detected.
kDebugNonMainFrameWithOldPageInfo = 2,
// Metrics and the bfcache situations do not match.
kDebugBackForwardCacheMetricsMismatch = 3,
// Detected a mismatch between the origin to commit as calculated on 1) the
// browser-side VS 2) the renderer-side.
kDebugBrowserVsRendererOriginToCommit = 4,
// Evict-Restore race in Back Forward Cache - Renderer requested a frame be
// evicted from cache, but the frame is no longer in the cache.
kDebugBackForwardCacheEvictRestoreRace = 5,
// HTTP response_head was unexpectedly nullptr even for HTTP or HTTPS schemes.
kDebugNoResponseHeadForHttpOrHttps = 6,
// RenderViewHost is not present when trying to create a new subframe's
// RenderFrameProxyHost.
kDebugSubframeProxyCreationWithNoRVH = 7,
// BackForwardCacheEntry exists for a subframe history navigation.
kDebugBackForwardCacheEntryExistsOnSubframeHistoryNav = 8,
// RenderFrameProxyHost does not exist when trying to call
// RenderFrameProxyHost::SetFocusedFrame().
// 9: kDebugNoRenderFrameProxyHostOnSetFocusedFrame was removed.
// The RenderFrameHost to be restored from the back/forward cache no longer
// exists for a navigation that is not marked as being restarted.
// 10: kDebugNoRestoredRFHOnNonRestartedNavigation was removed.
// After making changes, you MUST update the histograms xml by running:
// "python tools/metrics/histograms/update_debug_scenarios.py"
kMaxValue = kDebugBackForwardCacheEntryExistsOnSubframeHistoryNav,
};
// The tracing categories enabled for debugging navigation scenarios can be
// found in server-side studies config for slow reports.
void CaptureTraceForNavigationDebugScenario(DebugScenario scenario);
} // namespace content
#endif // CONTENT_COMMON_DEBUG_UTILS_H_
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