41 lines
1,022 B
C
41 lines
1,022 B
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 dup.c
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* @brief Implements the OP_DUP opcode for duplicating the top stack value in the VM.
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*
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* This file handles the OP_DUP instruction, which duplicates the top value on the stack.
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* The duplicated value is pushed back onto the stack.
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*
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* Behavior:
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* - Duplicates the top value on the stack.
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* - Pushes the duplicated value onto the stack.
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*
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* Error Handling:
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* - Exits with an error if the stack is empty.
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*
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* Example:
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* // Bytecode: OP_DUP
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* // Stack before: [42]
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* // Stack after: [42, 42]
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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_DUP: {
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if (vm->sp < 0) {
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fprintf(stderr, "Runtime error: stack underflow for DUP\n");
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exit(1);
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}
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Value top = vm->stack[vm->sp];
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push_value(vm, copy_value(&top));
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break;
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}
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