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5bc19af196
It appeared that without the packed keyword, the compiler did not handle access to unaligned record data members, which leads to crashes on the device. Change-Id: I401f075e7f62458a4733baa8d81983d4be34b730
80 lines
3.1 KiB
C++
80 lines
3.1 KiB
C++
#include <quiz.h>
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#include "../continuous_function.h"
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#include "../../graph/continuous_function_store.h"
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#include "../../sequence/sequence.h"
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#include "../../sequence/sequence_store.h"
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namespace Shared {
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template<class F>
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void interactWithBaseRecordMember(F * fct) {
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/* Accessing Function record member m_color, which has a 2-byte alignment
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* Only effective in DEBUG=1, as there are no compiler optimizations */
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KDColor color = fct->color();
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(void) color; // Silence compilation warning about unused variable.
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}
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void interactWithRecordMember(Sequence::SequenceStore * store, Ion::Storage::Record rec) {
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Sequence::Sequence * seq = store->modelForRecord(rec);
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/* Setting Sequence type will write record member m_initialConditionSizes,
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* which has a 2-byte alignment */
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seq->setType(Sequence::Sequence::Type::SingleRecurrence);
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interactWithBaseRecordMember<Sequence::Sequence>(seq);
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}
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void interactWithRecordMember(Graph::ContinuousFunctionStore * store, Ion::Storage::Record rec) {
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ContinuousFunction * fct = store->modelForRecord(rec).pointer();
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// Setting m_min from record member m_domain, which has a 2-byte alignment
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fct->setTMin(3.0f);
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interactWithBaseRecordMember<ContinuousFunction>(fct);
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}
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template<class T>
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Ion::Storage::Record createRecord(T * store) {
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Ion::Storage::Record::ErrorStatus err = store->addEmptyModel();
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assert(err == Ion::Storage::Record::ErrorStatus::None);
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(void) err; // Silence compilation warning about unused variable.
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return store->recordAtIndex(store->numberOfModels()-1);
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}
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template<class T>
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void testAlignmentHandlingFor() {
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T store;
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Ion::Storage * sharedStorage = Ion::Storage::sharedStorage();
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sharedStorage->destroyAllRecords();
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Ion::Storage::Record rec1 = createRecord<T>(&store);
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// Evaluate the sequence shift compared to a 2-byte alignment
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uintptr_t shift = reinterpret_cast<uintptr_t>(rec1.value().buffer) % 2;
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/* Interact with an alignment sensitive member. A mishandled record alignment
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* should throw an abort(alignment fault) exception */
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interactWithRecordMember(&store, rec1);
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sharedStorage->destroyAllRecords();
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// Repeat the same process with a 1 byte record padding
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Ion::Storage::Record::ErrorStatus err = sharedStorage->createRecordWithExtension("1", "1", "1", 1);
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assert(err == Ion::Storage::Record::ErrorStatus::None);
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(void) err; // Silence compilation warning about unused variable.
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Ion::Storage::Record rec2 = createRecord<T>(&store);
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shift += reinterpret_cast<uintptr_t>(rec2.value().buffer) % 2;
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interactWithRecordMember(&store, rec2);
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/* If fct1 and fct2 had different shifts, the test is able to detect a
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* mishandled record alignment */
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quiz_assert(shift == 1);
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sharedStorage->destroyAllRecords();
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}
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QUIZ_CASE(alignment_handling) {
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/* This test main function is to crash if storage alignment is not handled
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* properly. It also ensures that the right test - load and store of
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* differently-aligned objects - is performed (if storage/record
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* implementations change for instance). */
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testAlignmentHandlingFor<Sequence::SequenceStore>();
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testAlignmentHandlingFor<Graph::ContinuousFunctionStore>();
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}
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} |