coins.cfront
Class Evaluator

java.lang.Object
  coins.cfront.Evaluator

All Implemented Interfaces:

TokenId, TypeId

class Evaluator

extends java.lang.Object

implements TokenId, TypeId

Evaluator computes constant expressions. All integer constants are processed as long int values.

Field Summary

(package private) int[]

toSize

Fields inherited from interface coins.ast.TokenId

AND_E, ANDAND, ARROW, ASM, AUTO, BAD_TOKEN, BREAK, CASE, CAST_OP, CHAR, CHAR_CONST, COND_OP, CONST, CONTINUE, DEFAULT, DIV_E, DO, DOUBLE, DOUBLE_CONST, ELLIPSIS, ELSE, ENUM, EOF, EQ, EXOR_E, EXTERN, FLOAT, FLOAT_CONST, FOR, FUNCALL, GE, GOTO, IDENTIFIER, IF, IGNORE, INDEX_OP, INLINE, INT, INT_CONST, LE, LONG, LONG_CONST, LONG_DOUBLE_CONST, LONGLONG_CONST, LSHIFT, LSHIFT_E, MINUS_E, MINUSMINUS, MOD_E, MUL_E, MUTABLE, NEQ, OR_E, OROR, PLUS_E, PLUSPLUS, PRAGMA, REGISTER, RESTRICT, RETURN, RSHIFT, RSHIFT_E, SHORT, SIGNED, SIZEOF, SKIP_GCC_ASM, SKIP_GCC_ATTRIBUTE, STATIC, STRING_L, STRING_WL, STRUCT, SWITCH, TYPEDEF, TYPEDEF_NAME, UINT_CONST, ULONG_CONST, ULONGLONG_CONST, UNION, UNSIGNED, VOID, VOLATILE, WHILE

Fields inherited from interface coins.ast.TypeId

ARRAY_T, CHAR_T, CONST_T, DOUBLE_T, ELLIPSIS_T, ENUM_BEGIN, ENUM_END, FLOAT_T, FUNCTION_T, INT_T, LONG_DOUBLE_T, LONG_LONG_T, LONG_T, NO_DIMENSION_T, OFFSET_T, POINTER_T, RESTRICT_T, RETURN_T, S_AUTO, S_EXTERN, S_INLINE, S_NONE, S_REGISTER, S_STATIC, SHORT_T, SIGNED_T, SIZE_T, STRUCT_BEGIN, STRUCT_END, UNION_BEGIN, UNION_END, UNSIGNED_T, VOID_T, VOLATILE_T

Constructor Summary

Evaluator(MachineParam mp)

Method Summary

ConstantExpr	applyBinaryOp(Lex lex, ConstantExpr expr1, int op, ConstantExpr expr2) Constant folding for arithmetic binary expression.
ConstantExpr	applyUnaryOp(Lex lex, int op, ConstantExpr expr) Constant folding for arithmetic unary expression.
ConstantExpr	cast(Lex lex, ConstantExpr expr, EncodedType etype) Do constant folding by casting the constant expression expr to the type shown by etype.
ConstantExpr	make(double value)
ConstantExpr	make(double value, byte[] type)
ConstantExpr	make(double value, char type) Make floating constant expression.
ConstantExpr	make(double value, EncodedType type)
ConstantExpr	make(long value)
ConstantExpr	make(long value, byte[] type)
ConstantExpr	make(long value, char sign, char type) Make integer constant expression.
ConstantExpr	make(long value, EncodedType type)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

toSize

final int[] toSize

Constructor Detail

Evaluator

public Evaluator(MachineParam mp)

Method Detail

make

public ConstantExpr make(long value)

make

public ConstantExpr make(long value,
                         byte[] type)

make

public ConstantExpr make(long value,
                         EncodedType type)

make

public ConstantExpr make(long value,
                         char sign,
                         char type)

Make integer constant expression. If the precision of "type" is less than 64, upper bits are filled by sign extension (if "sign" is S) or 0-extension (if "sign" is U).

Returns:

Constant expression.

make

public ConstantExpr make(double value)

make

public ConstantExpr make(double value,
                         byte[] type)

make

public ConstantExpr make(double value,
                         EncodedType type)

make

public ConstantExpr make(double value,
                         char type)

Make floating constant expression. (How to adjust precision according to "type" ?)

Returns:

Constant expression.

cast

public ConstantExpr cast(Lex lex,
                         ConstantExpr expr,
                         EncodedType etype)
                  throws ParseError

Do constant folding by casting the constant expression expr to the type shown by etype.

Returns:

Constant expression.

Throws:

ParseError

applyUnaryOp

public ConstantExpr applyUnaryOp(Lex lex,
                                 int op,
                                 ConstantExpr expr)
                          throws ParseError

Constant folding for arithmetic unary expression.

Returns:

Constant expression.

Throws:

ParseError

applyBinaryOp

public ConstantExpr applyBinaryOp(Lex lex,
                                  ConstantExpr expr1,
                                  int op,
                                  ConstantExpr expr2)
                           throws ParseError

Constant folding for arithmetic binary expression.

Returns:

Constant expression.

Throws:

ParseError