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cd688ab9cf
If these classes are padded, we lose space in the Storage and the Storage::checksum is computed on uninitialized values (corresponding to the padding memory spaces)
75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
#ifndef SHARED_FUNCTION_H
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#define SHARED_FUNCTION_H
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#include <poincare/function.h>
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#include <poincare/symbol.h>
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#include "expression_model_handle.h"
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namespace Shared {
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class Function : public ExpressionModelHandle {
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public:
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enum class NameNotCompliantError {
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None = 0,
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CharacterNotAllowed,
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NameCannotStartWithNumber,
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ReservedName
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};
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constexpr static int k_parenthesedArgumentLength = 3;
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static constexpr char k_parenthesedArgument[k_parenthesedArgumentLength+1] = "(x)";
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constexpr static int k_maxNameWithArgumentSize = Poincare::SymbolAbstract::k_maxNameSize + k_parenthesedArgumentLength; /* Function name and null-terminating char + "(x)" */;
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static bool BaseNameCompliant(const char * baseName, NameNotCompliantError * error = nullptr);
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// Constructors
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Function(Ion::Storage::Record record) : ExpressionModelHandle(record){}
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// Properties
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bool isActive() const;
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KDColor color() const;
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void setActive(bool active);
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// Name
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int nameWithArgument(char * buffer, size_t bufferSize, CodePoint arg);
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// Evaluation
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virtual float evaluateAtAbscissa(float x, Poincare::Context * context) const {
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return templatedApproximateAtAbscissa(x, context, UCodePointUnknownX);
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}
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virtual double evaluateAtAbscissa(double x, Poincare::Context * context) const {
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return templatedApproximateAtAbscissa(x, context, UCodePointUnknownX);
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}
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virtual double sumBetweenBounds(double start, double end, Poincare::Context * context) const = 0;
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protected:
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/* FunctionRecordDataBuffer is the layout of the data buffer of Record
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* representing a Function. We want to avoid padding which would:
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* - increase the size of the storage file
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* - introduce junk memory zone which are then crc-ed in Storage::checksum
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* creating dependency on uninitialized values. */
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#pragma pack(push,1)
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class FunctionRecordDataBuffer {
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public:
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FunctionRecordDataBuffer(KDColor color) : m_color(color), m_active(true) {}
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KDColor color() const {
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/* Record::value() is a pointer to an address inside
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* Ion::Storage::sharedStorage(), and it might be unaligned. In the method
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* recordData(), we cast Record::value() to the type FunctionRecordDataBuffer.
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* We must thus do some convolutions to read KDColor, which is a uint16_t
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* and might produce an alignment error on the emscripten platform. */
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return KDColor::RGB16(Ion::StorageHelper::unalignedShort(reinterpret_cast<char *>(const_cast<KDColor *>(&m_color))));
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}
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bool isActive() const { return m_active; }
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void setActive(bool active) { m_active = active; }
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private:
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KDColor m_color;
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bool m_active;
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};
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#pragma pack(pop)
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private:
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template<typename T> T templatedApproximateAtAbscissa(T x, Poincare::Context * context, CodePoint unknownSymbol) const;
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FunctionRecordDataBuffer * recordData() const;
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};
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}
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#endif
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