44 lines
1.2 KiB
C
44 lines
1.2 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 lt.c
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* @brief Implements the OP_LT opcode for less-than comparison in the VM.
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*
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* This file handles the OP_LT instruction, which checks if the first value is less than the second.
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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 first value is less than the second.
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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_LT
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* - Stack before: [10, 42]
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* - Stack after: [1]
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*/
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case OP_LT: {
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Value b = pop_value(vm);
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Value a = pop_value(vm);
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if (a.type != VAL_INT || b.type != VAL_INT) {
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fprintf(stderr, "Runtime type error: LT expects ints, got %s and %s\n",
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value_type_name(a.type), value_type_name(b.type));
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exit(1);
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}
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Value res = make_int(a.i < b.i ? 1 : 0);
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free_value(a);
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free_value(b);
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push_value(vm, res);
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break;
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}
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