sub.c File Reference

Implements the OP_SUB opcode (numeric subtraction) in the VM. More...

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Functions
	if ((a.type==VAL_INT||a.type==VAL_FLOAT) &&(b.type==VAL_INT||b.type==VAL_FLOAT))
	exit (1)

Variables
case	OP_SUB
Value	a = pop_value(vm)
	else
	break

Detailed Description

Implements the OP_SUB opcode (numeric subtraction) in the VM.

Handles the OP_SUB instruction, subtracting two numeric operands and pushing the result. If either operand is a float, subtraction is performed in double precision; otherwise it is 64-bit integer subtraction.

Behavior:

• Pops two values from the stack.
• If any operand is VAL_FLOAT, computes (double)a - (double)b and pushes a VAL_FLOAT.
• Else computes a.i - b.i and pushes a VAL_INT.

Error Handling:

• Raises a runtime error and aborts execution if operands are not numeric.

Example:

• Bytecode: OP_SUB
• Stack before: [10, 4]
• Stack after: [6]
• Stack before: [10.0, 3]
• Stack after: [7.0]

Definition in file sub.c.

Function Documentation

exit()

exit

(

1

)

if()

if

(

(a.type==VAL_INT||a.type==VAL_FLOAT) &&(b.type==VAL_INT||b.type==VAL_FLOAT)

)

Definition at line 38 of file sub.c.

Variable Documentation

a

Value a = pop_value(vm)

Definition at line 37 of file sub.c.

break

break

Definition at line 57 of file sub.c.

else

else

Initial value:

{
    fprintf(stderr, "Runtime type error: SUB expects numbers, got %s and %s\n",
            value_type_name(a.type), value_type_name(b.type))

Definition at line 52 of file sub.c.

OP_SUB

case OP_SUB

Definition at line 35 of file sub.c.