src/dawn/tests/unittests/validation/ErrorScopeValidationTests.cpp

// Copyright 2019 The Dawn & Tint Authors
//
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#include <memory>
#include <vector>

#include "dawn/tests/MockCallback.h"
#include "dawn/tests/unittests/validation/ValidationTest.h"
#include "gmock/gmock.h"

using testing::_;
using testing::MockCppCallback;
using testing::NotNull;

class ErrorScopeValidationTest : public ValidationTest {
  protected:
    void FlushWireAndProcessEvents() {
        FlushWire();
        instance.ProcessEvents();
    }

    MockCppCallback<void (*)(wgpu::PopErrorScopeStatus, wgpu::ErrorType, const char*)>
        mPopErrorScopeCb;
};

// Test the simple success case.
TEST_F(ErrorScopeValidationTest, Success) {
    device.PushErrorScope(wgpu::ErrorFilter::Validation);

    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::NoError, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();
}

// Test the simple case where the error scope catches an error.
TEST_F(ErrorScopeValidationTest, CatchesError) {
    device.PushErrorScope(wgpu::ErrorFilter::Validation);

    wgpu::BufferDescriptor desc = {};
    desc.usage = static_cast<wgpu::BufferUsage>(WGPUBufferUsage_Force32);
    device.CreateBuffer(&desc);

    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::Validation, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();
}

// Test that errors bubble to the parent scope if not handled by the current scope.
TEST_F(ErrorScopeValidationTest, ErrorBubbles) {
    device.PushErrorScope(wgpu::ErrorFilter::Validation);
    device.PushErrorScope(wgpu::ErrorFilter::OutOfMemory);

    wgpu::BufferDescriptor desc = {};
    desc.usage = static_cast<wgpu::BufferUsage>(WGPUBufferUsage_Force32);
    device.CreateBuffer(&desc);

    // OutOfMemory does not match Validation error.
    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::NoError, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();

    // Parent validation error scope captures the error.
    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::Validation, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();
}

// Test that if an error scope matches an error, it does not bubble to the parent scope.
TEST_F(ErrorScopeValidationTest, HandledErrorsStopBubbling) {
    device.PushErrorScope(wgpu::ErrorFilter::OutOfMemory);
    device.PushErrorScope(wgpu::ErrorFilter::Validation);

    wgpu::BufferDescriptor desc = {};
    desc.usage = static_cast<wgpu::BufferUsage>(WGPUBufferUsage_Force32);
    device.CreateBuffer(&desc);

    // Inner scope catches the error.
    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::Validation, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();

    // Parent scope does not see the error.
    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::NoError, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();
}

// Test that if no error scope handles an error, it goes to the device UncapturedError callback
TEST_F(ErrorScopeValidationTest, UnhandledErrorsMatchUncapturedErrorCallback) {
    device.PushErrorScope(wgpu::ErrorFilter::OutOfMemory);

    wgpu::BufferDescriptor desc = {};
    desc.usage = static_cast<wgpu::BufferUsage>(WGPUBufferUsage_Force32);
    ASSERT_DEVICE_ERROR(device.CreateBuffer(&desc));

    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::NoError, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();
}

// Check that push/popping error scopes must be balanced.
TEST_F(ErrorScopeValidationTest, PushPopBalanced) {
    // No error scopes to pop.
    {
        EXPECT_CALL(mPopErrorScopeCb,
                    Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::Unknown, NotNull()))
            .Times(1);
        device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
        FlushWireAndProcessEvents();
    }
    // Too many pops
    {
        device.PushErrorScope(wgpu::ErrorFilter::Validation);

        EXPECT_CALL(mPopErrorScopeCb,
                    Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::NoError, _))
            .Times(1);
        device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
        FlushWireAndProcessEvents();

        EXPECT_CALL(mPopErrorScopeCb,
                    Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::Unknown, NotNull()))
            .Times(1);
        device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
        FlushWireAndProcessEvents();
    }
}

// Test that if the device is destroyed before the callback occurs, it is called with NoError.
TEST_F(ErrorScopeValidationTest, DeviceDestroyedBeforeCallback) {
    device.PushErrorScope(wgpu::ErrorFilter::OutOfMemory);
    {
        // Note: this is in its own scope to be clear the queue does not outlive the device.
        wgpu::Queue queue = device.GetQueue();
        queue.Submit(0, nullptr);
    }

    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::NoError, _))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    ExpectDeviceDestruction();
    device = nullptr;

    FlushWireAndProcessEvents();
}

// If the device is destroyed, pop error scope should callback with device lost.
TEST_F(ErrorScopeValidationTest, DeviceDestroyedBeforePop) {
    device.PushErrorScope(wgpu::ErrorFilter::Validation);
    ExpectDeviceDestruction();
    device.Destroy();
    FlushWireAndProcessEvents();

    EXPECT_CALL(mPopErrorScopeCb,
                Call(wgpu::PopErrorScopeStatus::Success, wgpu::ErrorType::DeviceLost, NotNull()))
        .Times(1);
    device.PopErrorScope(wgpu::CallbackMode::AllowProcessEvents, mPopErrorScopeCb.Callback());
    FlushWireAndProcessEvents();
}

// Regression test that on device shutdown, we don't get a recursion in O(pushed error scope) that
// would lead to a stack overflow
TEST_F(ErrorScopeValidationTest, ShutdownStackOverflow) {
    for (size_t i = 0; i < 1'000'000; i++) {
        device.PushErrorScope(wgpu::ErrorFilter::Validation);
    }
}