51 lines
1.4 KiB
C
51 lines
1.4 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 push.c
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* @brief Implements the OP_PUSH opcode for appending elements to arrays in the VM.
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*
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* Handles the OP_PUSH instruction, which appends a value to the end of an array.
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* The array and value are popped from the stack; the opcode pushes the new array
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* length (integer) as a result.
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*
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* Behavior:
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* - Pops the value and array from the stack.
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* - Appends the value to the end of the array.
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* - Pushes the new length of the array onto the stack.
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*
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* Error Handling:
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* - Exits with a runtime error if the first operand is not an array.
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* - Exits with a runtime error if memory allocation fails.
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*
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* Example:
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* // Bytecode: OP_PUSH
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* // Stack before: [42, [10, 20, 30]]
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* // Stack after: [4]
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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_PUSH: {
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Value v = pop_value(vm);
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Value arr = pop_value(vm);
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if (arr.type != VAL_ARRAY) {
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fprintf(stderr, "Runtime type error: ARR_PUSH expects array\n");
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exit(1);
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}
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int n = array_push(&arr, v);
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if (n < 0) {
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fprintf(stderr, "Runtime error: push failed (OOM?)\n");
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exit(1);
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}
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free_value(arr);
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push_value(vm, make_int(n));
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break;
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}
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