2025-09-16 02:11:22 +02:00
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/**
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* This file is part of the Fun programming language.
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* https://hanez.org/project/fun/
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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 ISC license.
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* https://opensource.org/license/isc-license-txt
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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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2025-09-15 06:31:32 +02:00
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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: neq = (a.i != b.i); break;
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case VAL_STRING: neq = (a.s && b.s) ? (strcmp(a.s, b.s) != 0) : (a.s != b.s); break;
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case VAL_FUNCTION: neq = (a.fn != b.fn); break;
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case VAL_NIL: neq = 0; break;
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default: neq = 1; break;
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}
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} else {
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neq = 1;
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}
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push_value(vm, make_int(neq ? 1 : 0));
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free_value(a); free_value(b);
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break;
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}
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