global_state.cpp

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Author : Alexis Hetu
Date : 2020-12-04 14:07:24
Hash : f2a15485
Message : Suppress memory leaks detected by LSAN In order to be able to land SwANGLE in Chromium, this cl adds suppressions for memory leaks detected by LSAN. Some of these should be fixed and some are intentional leaks of global variables. This cl should allow the linux_chromium_asan_rel_ng bot to pass while using SwANGLE and shouldn't break the win-libfuzzer-asan-rel bot. Bug: chromium:972686 Bug: angleproject:5377 Change-Id: I7e2336aba43fcfeb95716d6c0aa05caf855134aa Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2575200 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Alexis Hétu <sugoi@chromium.org>

src/libGLESv2/global_state.cpp

//
// Copyright 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// global_state.cpp : Implements functions for querying the thread-local GL and EGL state.

#include "libGLESv2/global_state.h"

#include "common/debug.h"
#include "common/platform.h"
#include "common/system_utils.h"
#include "libANGLE/ErrorStrings.h"
#include "libANGLE/Thread.h"
#include "libGLESv2/resource.h"

#include <atomic>

namespace egl
{
namespace
{
ANGLE_REQUIRE_CONSTANT_INIT std::atomic<angle::GlobalMutex *> g_Mutex(nullptr);
static_assert(std::is_trivially_destructible<decltype(g_Mutex)>::value,
              "global mutex is not trivially destructible");

void SetContextToAndroidOpenGLTLSSlot(gl::Context *value)
{
#if defined(ANGLE_PLATFORM_ANDROID)
    if (angle::gUseAndroidOpenGLTlsSlot)
    {
        ANGLE_ANDROID_GET_GL_TLS()[angle::kAndroidOpenGLTlsSlot] = static_cast<void *>(value);
    }
#endif
}

Thread *AllocateCurrentThread()
{
    {
        // Global thread intentionally leaked
        ANGLE_SCOPED_DISABLE_LSAN();
        gCurrentThread = new Thread();
    }

    // Initialize fast TLS slot
    SetContextToAndroidOpenGLTLSSlot(nullptr);
    gl::gCurrentValidContext = nullptr;

    return gCurrentThread;
}

void AllocateMutex()
{
    if (g_Mutex == nullptr)
    {
        std::unique_ptr<angle::GlobalMutex> newMutex(new angle::GlobalMutex());
        angle::GlobalMutex *expected = nullptr;
        if (g_Mutex.compare_exchange_strong(expected, newMutex.get()))
        {
            newMutex.release();
        }
    }
}

}  // anonymous namespace

thread_local Thread *gCurrentThread = nullptr;

angle::GlobalMutex &GetGlobalMutex()
{
    AllocateMutex();
    return *g_Mutex;
}

Thread *GetCurrentThread()
{
    Thread *current = gCurrentThread;
    return (current ? current : AllocateCurrentThread());
}

void SetContextCurrent(Thread *thread, gl::Context *context)
{
    ASSERT(gCurrentThread);
    gCurrentThread->setCurrent(context);
    SetContextToAndroidOpenGLTLSSlot(context);
    gl::gCurrentValidContext = context;
}
}  // namespace egl

namespace gl
{
void GenerateContextLostErrorOnContext(Context *context)
{
    if (context && context->isContextLost())
    {
        context->validationError(GL_CONTEXT_LOST, err::kContextLost);
    }
}

void GenerateContextLostErrorOnCurrentGlobalContext()
{
    GenerateContextLostErrorOnContext(GetGlobalContext());
}
}  // namespace gl

#ifdef ANGLE_PLATFORM_WINDOWS
namespace egl
{

namespace
{
void DeallocateCurrentThread()
{
    SafeDelete(gCurrentThread);
}

void DeallocateMutex()
{
    angle::GlobalMutex *mutex = g_Mutex.exchange(nullptr);
    {
        // Wait for the mutex to become released by other threads before deleting.
        std::lock_guard<angle::GlobalMutex> lock(*mutex);
    }
    SafeDelete(mutex);
}

bool InitializeProcess()
{
    EnsureDebugAllocated();
    AllocateMutex();
    return AllocateCurrentThread() != nullptr;
}

void TerminateProcess()
{
    DeallocateDebug();
    DeallocateMutex();
    DeallocateCurrentThread();
}

}  // anonymous namespace

}  // namespace egl

namespace
{
// The following WaitForDebugger code is based on SwiftShader. See:
// https://cs.chromium.org/chromium/src/third_party/swiftshader/src/Vulkan/main.cpp
#    if defined(ANGLE_ENABLE_ASSERTS) && !defined(ANGLE_ENABLE_WINDOWS_UWP)
INT_PTR CALLBACK DebuggerWaitDialogProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    RECT rect;

    switch (uMsg)
    {
        case WM_INITDIALOG:
            ::GetWindowRect(GetDesktopWindow(), &rect);
            ::SetWindowPos(hwnd, HWND_TOP, rect.right / 2, rect.bottom / 2, 0, 0, SWP_NOSIZE);
            ::SetTimer(hwnd, 1, 100, NULL);
            return TRUE;
        case WM_COMMAND:
            if (LOWORD(wParam) == IDCANCEL)
            {
                ::EndDialog(hwnd, 0);
            }
            break;
        case WM_TIMER:
            if (angle::IsDebuggerAttached())
            {
                ::EndDialog(hwnd, 0);
            }
    }

    return FALSE;
}

void WaitForDebugger(HINSTANCE instance)
{
    if (angle::IsDebuggerAttached())
        return;

    HRSRC dialog = ::FindResourceA(instance, MAKEINTRESOURCEA(IDD_DIALOG1), MAKEINTRESOURCEA(5));
    if (!dialog)
    {
        printf("Error finding wait for debugger dialog. Error %lu.\n", ::GetLastError());
        return;
    }

    DLGTEMPLATE *dialogTemplate = reinterpret_cast<DLGTEMPLATE *>(::LoadResource(instance, dialog));
    ::DialogBoxIndirectA(instance, dialogTemplate, NULL, DebuggerWaitDialogProc);
}
#    else
void WaitForDebugger(HINSTANCE instance) {}
#    endif  // defined(ANGLE_ENABLE_ASSERTS) && !defined(ANGLE_ENABLE_WINDOWS_UWP)
}  // namespace

extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID)
{
    switch (reason)
    {
        case DLL_PROCESS_ATTACH:
            if (angle::GetEnvironmentVar("ANGLE_WAIT_FOR_DEBUGGER") == "1")
            {
                WaitForDebugger(instance);
            }
            return static_cast<BOOL>(egl::InitializeProcess());

        case DLL_THREAD_ATTACH:
            return static_cast<BOOL>(egl::AllocateCurrentThread() != nullptr);

        case DLL_THREAD_DETACH:
            egl::DeallocateCurrentThread();
            break;

        case DLL_PROCESS_DETACH:
            egl::TerminateProcess();
            break;
    }

    return TRUE;
}
#endif  // ANGLE_PLATFORM_WINDOWS

kc3-lang/angle/src/libGLESv2/global_state.cpp

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kc3-lang/angle /src/libGLESv2/global_state.cpp