stack.c
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stack.c
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	#include "stack.h"
	#include "arena.h"

	#include <stdint.h>
	#include <stdlib.h>

	call_stack_t global_call_stack = {NULL, 0, 0};

	void pop_call_frame(void) {
	if (global_call_stack.depth > 0) global_call_stack.depth--;
	}

	bool push_call_frame(const char filename, const char function_name, const char *code, uint32_t pos) {
	if (global_call_stack.depth >= global_call_stack.capacity) {
	int new_capacity = global_call_stack.capacity == 0 ? 32 : global_call_stack.capacity * 2;
	if ((size_t)new_capacity > SIZE_MAX / sizeof(call_frame_t)) return false;

	call_frame_t new_stack = (call_frame_t )ant_realloc(global_call_stack.frames, new_capacity * sizeof(call_frame_t));
	if (!new_stack) return false;

	global_call_stack.frames = new_stack;
	global_call_stack.capacity = new_capacity;
	}

	call_frame_t *frame = &global_call_stack.frames[global_call_stack.depth++];

	*frame = (call_frame_t) {
	.filename = filename,
	.function_name = function_name,
	.code = code,
	.pos = pos,
	.line = -1,
	.col = -1,
	};

	return true;
	}