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SunSoft, Inc. 2550 Garcia Avenue Mountain View, California 94043 NOTE: SunOS, SunSoft, Sun, Solaris, Sun Microsystems or the Sun logo are trademarks or registered trademarks of Sun Microsystems, Inc. */ #ifndef _AST_EXPRESSION_AST_EXPRESSION_HH #define _AST_EXPRESSION_AST_EXPRESSION_HH // Representation of expression values /* ** DEPENDENCIES: NONE ** ** USE: Included from ast.hh */ // An expression (and maybe its value, if computed) class AST_Expression { public: // Enum to define all the different operators to combine expressions enum ExprComb { EC_add // '+' , EC_minus // '-' , EC_mul // '*' , EC_div // '/' , EC_mod // '%' , EC_or // '|' , EC_xor // '^' , EC_and // '&' , EC_left // '<<' , EC_right // '>>' , EC_u_plus // unary '+' , EC_u_minus // unary '-' , EC_bit_neg // '~' , EC_none // No operator (missing) , EC_symbol // a symbol (function or constant name) }; // Enum to define the different kinds of evaluation possible // Extend this for more kinds of evaluation as required enum EvalKind { EK_const // Must evaluate to constant , EK_positive_int // Must evaluate to positive integer }; // Enum to define expression type enum ExprType { EV_short // Expression value is short , EV_ushort // Expression value is unsigned short , EV_long // Expression value is long , EV_ulong // Expression value is unsigned long , EV_longlong // Expression value is long long , EV_ulonglong // Expression value is unsigned long long , EV_float // Expression value is 32-bit float , EV_double // Expression value is 64-bit float , EV_longdouble // Expression value is 128-bit float , EV_char // Expression value is char , EV_wchar // Expression value is wide char , EV_octet // Expression value is unsigned char , EV_bool // Expression value is boolean , EV_string // Expression value is char * , EV_wstring // Expression value is wchar_t * , EV_any // Expression value is any of above , EV_void // Expression value is void (absent) , EV_none // Expression value is missing }; // Structure to descrive value of constant expression and its type struct AST_ExprValue { union { short sval; // Contains short expression value unsigned short usval; // Contains unsigned short expr value long lval; // Contains long expression value unsigned long ulval; // Contains unsigned long expr value unsigned long bval; // Contains boolean expression value float fval; // Contains 32-bit float expr value double dval; // Contains 64-bit float expr value char cval; // Contains char expression value unsigned char oval; // Contains unsigned char expr value String *strval; // Contains String * expr value unsigned long eval; // Contains enumeration value } u; ExprType et; }; // Operations // Constructor(s) AST_Expression(AST_Expression *v, ExprType t); AST_Expression(ExprComb c, AST_Expression *v1, AST_Expression *v2); AST_Expression(short s); AST_Expression(unsigned short us); AST_Expression(long l); AST_Expression(long l, ExprType t); AST_Expression(unsigned long ul); AST_Expression(float f); AST_Expression(double d); AST_Expression(char c); AST_Expression(unsigned char uc); AST_Expression(String *s); AST_Expression(UTL_ScopedName *n); virtual ~AST_Expression () {} // Data Accessors UTL_Scope *defined_in(); void set_defined_in(UTL_Scope *d); long line(); void set_line(long l); String *file_name(); void set_file_name(String *f); ExprComb ec(); void set_ec(ExprComb new_ec); AST_ExprValue *ev(); void set_ev(AST_ExprValue *new_ev); AST_Expression *v1(); void set_v1(AST_Expression *e); AST_Expression *v2(); void set_v2(AST_Expression *e); UTL_ScopedName *n(); void set_n(UTL_ScopedName *new_n); // AST Dumping virtual void dump(ostream &o); // Other operations // Evaluation and value coercion virtual AST_ExprValue *eval(EvalKind ek); virtual AST_ExprValue *coerce(ExprType t); // Evaluate then store value inside this AST_Expression virtual void evaluate(EvalKind ek); // Compare to AST_Expressions virtual long operator==(AST_Expression *vc); virtual long compare(AST_Expression *vc); protected: // Evaluate different sets of operators virtual AST_ExprValue *eval_bin_op(EvalKind ek); virtual AST_ExprValue *eval_bit_op(EvalKind ek); virtual AST_ExprValue *eval_un_op(EvalKind ek); virtual AST_ExprValue *eval_symbol(EvalKind ek); private: // Data UTL_Scope *pd_defined_in; // Scope long pd_line; // Line defined in String *pd_file_name; // What file defined in ExprComb pd_ec; // What combinator AST_ExprValue *pd_ev; // computed value AST_Expression *pd_v1; // 1st sub-expression AST_Expression *pd_v2; // 2nd sub-expression UTL_ScopedName *pd_n; // symbolic name (if any) // Operations // Fill out the lineno, filename and definition scope details void fill_definition_details(); // Internal evaluation virtual AST_ExprValue *eval_internal(EvalKind ek); }; #endif // _AST_EXPR_VAL_AST_EXPR_VAL_HH