StackCheckerCtx Class Reference

Inheritance diagram for StackCheckerCtx:

Public Types
enum class	Behavior { kGrowth , kBaseline , kUnknown }

Public Member Functions
	StackCheckerCtx ()
StackCheckerCtx *	expectGrowth ()
StackCheckerCtx *	expectBaseline ()
void	validate (skiatest::Reporter *r)

Static Public Member Functions
static Behavior	GrowthBehavior ()

Detailed Description

Definition at line 3348 of file SkRasterPipelineTest.cpp.

Member Enumeration Documentation

Behavior

enum class StackCheckerCtx::Behavior

strong

Enumerator
kGrowth
kBaseline
kUnknown

Definition at line 3357 of file SkRasterPipelineTest.cpp.

                        {
        kGrowth,
        kBaseline,
        kUnknown,
    };

Constructor & Destructor Documentation

StackCheckerCtx()

StackCheckerCtx::StackCheckerCtx ( )

inline

Definition at line 3350 of file SkRasterPipelineTest.cpp.

                      {
        this->fn = [](SkRasterPipeline_CallbackCtx* self, int active_pixels) {
            auto ctx = (StackCheckerCtx*)self;
            ctx->fStackAddrs.push_back(&active_pixels);
        };
    }

Member Function Documentation

expectBaseline()

StackCheckerCtx * StackCheckerCtx::expectBaseline ( )

inline

Definition at line 3376 of file SkRasterPipelineTest.cpp.

                                      {
        fExpectedBehavior.push_back(Behavior::kBaseline);
        return this;
    }

expectGrowth()

StackCheckerCtx * StackCheckerCtx::expectGrowth ( )

inline

Definition at line 3371 of file SkRasterPipelineTest.cpp.

                                    {
        fExpectedBehavior.push_back(GrowthBehavior());
        return this;
    }

GrowthBehavior()

static Behavior StackCheckerCtx::GrowthBehavior ( )

inlinestatic

Definition at line 3363 of file SkRasterPipelineTest.cpp.

                                     {
        // Only some stages use the musttail attribute, so we have no way of knowing what's going to
        // happen. In release builds, it's likely that the compiler will apply tail-call
        // optimization. Even in some debug builds (on Windows), we don't see stack growth.
        return Behavior::kUnknown;
    }

validate()

void StackCheckerCtx::validate ( skiatest::Reporter *  r )

inline

Definition at line 3381 of file SkRasterPipelineTest.cpp.

                                       {
        REPORTER_ASSERT(r, fStackAddrs.size() == fExpectedBehavior.size());
 
        // This test is storing and comparing stack pointers (to dead stack frames) as a way of
        // measuring stack usage. Unsurprisingly, ASAN doesn't like that. HWASAN actually inserts
        // tag bytes in the pointers, causing them not to match. Newer versions of vanilla ASAN
        // also appear to salt the stack slightly, causing repeated calls to scrape different
        // addresses, even though $rsp is identical on each invocation of the lambda.
#if !defined(SK_SANITIZE_ADDRESS)
        void* baseline = fStackAddrs[0];
        for (size_t i = 1; i < fStackAddrs.size(); i++) {
            if (fExpectedBehavior[i] == Behavior::kGrowth) {
                REPORTER_ASSERT(r, fStackAddrs[i] != baseline);
            } else if (fExpectedBehavior[i] == Behavior::kBaseline) {
                REPORTER_ASSERT(r, fStackAddrs[i] == baseline);
            } else {
                // Unknown behavior, nothing we can assert here
            }
        }
#endif
    }

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The documentation for this class was generated from the following file:

• third_party/skia/tests/SkRasterPipelineTest.cpp