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 call.c
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* @brief Implements the OP_CALL opcode for function calls in the VM.
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*
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* This file handles the OP_CALL instruction, which calls a function with arguments.
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*
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* Behavior:
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* - operand specifies number of arguments
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* - Pops args and function from stack
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* - Creates new frame with args in locals
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* - Sets IP to start of function
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*
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* Error Handling:
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* - Exits with error if not enough args
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* - Exits if function isn't callable
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*/
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case OP_CALL: {
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int argc = inst.operand;
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if (argc < 0) argc = 0;
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/* collect args in reverse (preserve order) */
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Value *args = NULL;
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if (argc > 0) {
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args = (Value *)malloc(sizeof(Value) * argc);
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/* pop args into array in reverse */
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for (int i = argc - 1; i >= 0; --i) {
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args[i] = pop_value(vm);
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}
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}
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/* pop function value */
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Value fnv = pop_value(vm);
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if (fnv.type != VAL_FUNCTION) {
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fprintf(stderr, "Runtime type error: CALL expects function\n");
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exit(1);
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}
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/* push new frame and transfer args */
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vm_push_frame(vm, fnv.fn, argc, args);
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/* free args array (locals moved), free fnv (no-op for function) */
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free(args);
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/* note: fnv contains a pointer to the Bytecode, don't free here */
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break;
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}
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