Cm

C minor(Cm) is a mini version of the C programming language using Flex and Bison compiler generating package.

AST

                                            Node
                ┌────────────────────────────┼─────────────────────────────┐
            NStatement                    NBlock                      NExpression
    ┌────────────────┼─────┐                           ┌─────┬───┬───────┼─────────┬──────────┐
NExpressionStatement │ NVarDeclStatement            NInteger │ NDouble   NVariable │    NAssignment
          NControlFlowStatement                        NUnaryOperation      NBinaryOperation
        ┌────────────┼─────────────────┐
NWhileStatement   NForStatement   NIfStatement

Symbol Table

Member	Data Type	Description
type	int	Used for raising TypeMismatch exception
constant	bool	Used for raising ReadOnly exception
initialized	bool	Used for raising Uninitialized exception
used	bool	Used for raising not used warnings
reference	string	Used for referencing the symbol in quadruples

Data Types

Type	Description
int	An integer type ranging from -2,147,483,648 to 2,147,483,647
double	A floating-point type of 15 decimal places precision ranging from 2.3E-308 to 1.7E+308
void	Valueless

Operators

Mathematical

Operator	Description
+	Adds two operands
-	Subtracts second operand from the first
*	Multiplies both operands
/	Divides numerator by de-numerator

Relational

Operator	Description
==	Checks if the values of two operands are equal
!=	Checks if the values of two operands are not equal
>	Checks if the value of left operand is greater than the value of right operand
<	Checks if the value of left operand is less than the value of right operand
>=	Checks if the value of left operand is greater than or equal the value of right operand
<=	Checks if the value of left operand is less than or equal the value of right operand

Logical

Operator	Description
!	Logical NOT operator

Assignment

Operator	Description
=	Assigns values from right side operands to left side operand

Operators Precedence

Operator	Associativity
!	Right to left
* /	Left to right
+ -	Left to right
< <= > >=	Left to right
== !=	Left to right
=	Right to left

Assembly Quadruples

Quadruple	Description
LOADi $1	Reserve memory for integer variable $1
LOADd $1	Reserve memory for double variable $1
NOT $1, $2	$1 = !$2
MOV $1, $2	$1 = $2
ADD $1, $2, $3	$1 = $2 + $3
SUB $1, $2, $3	$1 = $2 - $3
MUL $1, $2, $3	$1 = $2 * $3
DIV $1, $2, $3	$1 = $2 / $3
CLT $1, $2, $3	$1 = 1 if $2 < $3 else 0
CGT $1, $2, $3	$1 = 1 if $2 > $3 else 0
CGE $1, $2, $3	$1 = 1 if $2 >= $3 else 0
CLE $1, $2, $3	$1 = 1 if $2 <= $3 else 0
CEQ $1, $2, $3	$1 = 1 if $2 == $3 else 0
CNE $1, $2, $3	$1 = 1 if $2 != $3 else 0
JZ $1, label	Jump to label if $1 = 0
JNZ $1, label	Jump to label if $1= 1
JMP label	Unconditional jump to label