diff options
Diffstat (limited to 'LValue.h')
| -rw-r--r-- | LValue.h | 67 |
1 files changed, 52 insertions, 15 deletions
@@ -46,8 +46,8 @@ protected: m_context(_compilerContext), m_dataType(_dataType) {} public: - /// @returns true if this lvalue reference type occupies a slot on the stack. - virtual bool storesReferenceOnStack() const = 0; + /// @returns the number of stack slots occupied by the lvalue reference + virtual unsigned sizeOnStack() const { return 1; } /// Copies the value of the current lvalue to the top of the stack and, if @a _remove is true, /// also removes the reference from the stack. /// @a _location source location of the current expression, used for error reporting. @@ -61,7 +61,9 @@ public: /// Stores zero in the lvalue. Removes the reference from the stack if @a _removeReference is true. /// @a _location is the source location of the requested operation virtual void setToZero( - SourceLocation const& _location = SourceLocation(), bool _removeReference = true) const = 0; + SourceLocation const& _location = SourceLocation(), + bool _removeReference = true + ) const = 0; protected: CompilerContext& m_context; @@ -76,12 +78,17 @@ class StackVariable: public LValue public: StackVariable(CompilerContext& _compilerContext, Declaration const& _declaration); - virtual bool storesReferenceOnStack() const { return false; } + virtual unsigned sizeOnStack() const override { return 0; } virtual void retrieveValue(SourceLocation const& _location, bool _remove = false) const override; - virtual void storeValue(Type const& _sourceType, - SourceLocation const& _location = SourceLocation(), bool _move = false) const override; + virtual void storeValue( + Type const& _sourceType, + SourceLocation const& _location = SourceLocation(), + bool _move = false + ) const override; virtual void setToZero( - SourceLocation const& _location = SourceLocation(), bool _removeReference = true) const override; + SourceLocation const& _location = SourceLocation(), + bool _removeReference = true + ) const override; private: /// Base stack offset (@see CompilerContext::getBaseStackOffsetOfVariable) of the local variable. @@ -100,12 +107,16 @@ public: StorageItem(CompilerContext& _compilerContext, Declaration const& _declaration); /// Constructs the LValue and assumes that the storage reference is already on the stack. StorageItem(CompilerContext& _compilerContext, Type const& _type); - virtual bool storesReferenceOnStack() const { return true; } virtual void retrieveValue(SourceLocation const& _location, bool _remove = false) const override; - virtual void storeValue(Type const& _sourceType, - SourceLocation const& _location = SourceLocation(), bool _move = false) const override; + virtual void storeValue( + Type const& _sourceType, + SourceLocation const& _location = SourceLocation(), + bool _move = false + ) const override; virtual void setToZero( - SourceLocation const& _location = SourceLocation(), bool _removeReference = true) const override; + SourceLocation const& _location = SourceLocation(), + bool _removeReference = true + ) const override; private: /// Number of stack elements occupied by the value (not the reference). @@ -114,6 +125,28 @@ private: }; /** + * Reference to a single byte inside a storage byte array. + * Stack: <storage_ref> <byte_number> + */ +class StorageByteArrayElement: public LValue +{ +public: + /// Constructs the LValue and assumes that the storage reference is already on the stack. + StorageByteArrayElement(CompilerContext& _compilerContext); + virtual unsigned sizeOnStack() const override { return 2; } + virtual void retrieveValue(SourceLocation const& _location, bool _remove = false) const override; + virtual void storeValue( + Type const& _sourceType, + SourceLocation const& _location = SourceLocation(), + bool _move = false + ) const override; + virtual void setToZero( + SourceLocation const& _location = SourceLocation(), + bool _removeReference = true + ) const override; +}; + +/** * Reference to the "length" member of a dynamically-sized array. This is an LValue with special * semantics since assignments to it might reduce its length and thus arrays members have to be * deleted. @@ -123,12 +156,16 @@ class StorageArrayLength: public LValue public: /// Constructs the LValue, assumes that the reference to the array head is already on the stack. StorageArrayLength(CompilerContext& _compilerContext, ArrayType const& _arrayType); - virtual bool storesReferenceOnStack() const { return true; } virtual void retrieveValue(SourceLocation const& _location, bool _remove = false) const override; - virtual void storeValue(Type const& _sourceType, - SourceLocation const& _location = SourceLocation(), bool _move = false) const override; + virtual void storeValue( + Type const& _sourceType, + SourceLocation const& _location = SourceLocation(), + bool _move = false + ) const override; virtual void setToZero( - SourceLocation const& _location = SourceLocation(), bool _removeReference = true) const override; + SourceLocation const& _location = SourceLocation(), + bool _removeReference = true + ) const override; private: ArrayType const& m_arrayType; |