66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/**
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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 index_get.c
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* @brief Implements the OP_INDEX_GET opcode for array and map indexing in the VM.
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*
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* This file handles the OP_INDEX_GET instruction, which retrieves an element from
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* an array or a value from a map using an index or key.
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*
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* Behavior:
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* - Pops the index/key and container from the stack.
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* - For arrays, retrieves the element at the specified index.
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* - For maps, retrieves the value associated with the specified key.
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* - Pushes the retrieved value onto the stack.
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*
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* Error Handling:
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* - Exits with an error if the container is not an array or map, if the index/key
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* is of the wrong type, or if the index is out of bounds.
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*
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* Example:
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* // Bytecode: OP_INDEX_GET
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* // Stack before: [1, [10, 20, 30]]
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* // Stack after: [20]
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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_INDEX_GET: {
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Value idx = pop_value(vm);
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Value container = pop_value(vm);
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#ifdef FUN_DEBUG
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fprintf(stderr, "DEBUG INDEX_GET: container.type=%d idx.type=%d\n",
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container.type, idx.type);
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#endif
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if (container.type == VAL_ARRAY) {
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if (idx.type != VAL_INT) { fprintf(stderr, "INDEX_GET index must be int for array\n"); exit(1); }
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Value elem;
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if (!array_get_copy(&container, (int)idx.i, &elem)) {
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fprintf(stderr, "Runtime error: index out of range\n"); exit(1);
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}
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free_value(container);
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free_value(idx);
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push_value(vm, elem);
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} else if (container.type == VAL_MAP) {
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if (idx.type != VAL_STRING) { fprintf(stderr, "INDEX_GET key must be string for map\n"); exit(1); }
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Value out;
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if (!map_get_copy(&container, idx.s ? idx.s : "", &out)) {
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out = make_nil();
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}
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free_value(container);
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free_value(idx);
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push_value(vm, out);
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} else {
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fprintf(stderr, "Runtime type error: INDEX_GET expects array or map\n");
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exit(1);
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}
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break;
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}
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