73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/**
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* This file is part of the Fun programming language.
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* https://fun-lang.xyz/
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*
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* Copyright 2025 Johannes Findeisen <you@hanez.org>
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* Licensed under the terms of the Apache-2.0 license.
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* https://opensource.org/license/apache-2-0
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*/
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/**
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* @file neq.c
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* @brief Implements the OP_NEQ opcode for inequality comparison in the VM.
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*
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* This file handles the OP_NEQ instruction, which checks if two values are not equal.
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* The values are popped from the stack, and the result (1 or 0) is pushed back.
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*
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* Behavior:
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* - Pops two values from the stack.
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* - Checks if the values are not equal.
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* - Pushes 1 (true) or 0 (false) onto the stack.
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*
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* Error Handling:
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* - Exits with an error if the operands are of incompatible types.
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*
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* Example:
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* // Bytecode: OP_NEQ
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* // Stack before: [42, 10]
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* // Stack after: [1]
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*
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* @author Johannes Findeisen
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* @date 2025-10-16
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*/
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case OP_NEQ: {
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Value b = pop_value(vm);
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Value a = pop_value(vm);
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int neq = 1;
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if (a.type == b.type) {
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switch (a.type) {
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case VAL_INT:
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neq = (a.i != b.i);
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break;
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case VAL_BOOL:
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neq = ((a.i != 0) != (b.i != 0));
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break;
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case VAL_STRING:
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neq = (a.s && b.s) ? (strcmp(a.s, b.s) != 0) : (a.s != b.s);
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break;
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case VAL_FUNCTION:
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neq = (a.fn != b.fn);
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break;
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case VAL_NIL:
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neq = 0;
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break;
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default:
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neq = 1;
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break;
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}
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} else {
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/* interop: bool vs int (0/1) */
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if ((a.type == VAL_BOOL && b.type == VAL_INT) || (a.type == VAL_INT && b.type == VAL_BOOL)) {
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int ai = (a.type == VAL_BOOL) ? (a.i != 0) : (a.i != 0);
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int bi = (b.type == VAL_BOOL) ? (b.i != 0) : (b.i != 0);
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neq = (ai != bi);
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} else {
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neq = 1;
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}
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}
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push_value(vm, make_bool(neq));
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free_value(a);
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free_value(b);
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break;
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}
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