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

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

	call_stack_t global_call_stack = {NULL, 0, 0};

	void pop_call_frame(void) {
	if (global_call_stack.depth == 0) return;
	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) {
	size_t new_capacity = global_call_stack.capacity == 0 ? 32U : (size_t)global_call_stack.capacity * 2U;
	if (new_capacity > (size_t)INT_MAX) abort();
	if (new_capacity > SIZE_MAX / sizeof(call_frame_t)) abort();

	size_t alloc_size = new_capacity * sizeof(call_frame_t);
	call_frame_t new_stack = (call_frame_t )ant_realloc(global_call_stack.frames, alloc_size);
	if (!new_stack) abort();

	global_call_stack.frames = new_stack;
	global_call_stack.capacity = (int)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;
	}