sledge/runtime/include/runtime.h

#ifndef SFRT_RUNTIME_H
#define SFRT_RUNTIME_H
#include "types.h"

#include <uv.h>
#include "sandbox.h"
#include "module.h"
#include <sys/epoll.h> // for epoll_create1(), epoll_ctl(), struct epoll_event

// global queue for stealing (work-stealing-deque)
extern struct deque_sandbox *glb_dq;
extern pthread_mutex_t glbq_mtx;
extern int epfd;

void alloc_linear_memory(void);
void expand_memory(void);
void free_linear_memory(void *base, u32 bound, u32 max);
// Assumption: bounds_check < WASM_PAGE_SIZE
INLINE char *get_memory_ptr_for_runtime(u32 offset, u32 bounds_check);

static inline void *
get_memory_ptr_void(u32 offset, u32 bounds_check)
{
	return (void*) get_memory_ptr_for_runtime(offset, bounds_check);
}

static inline char *
get_memory_string(u32 offset)
{
	char *naive_ptr = get_memory_ptr_for_runtime(offset, 1);
	int i = 0;

	while (1) {
		// Keep bounds checking the waters over and over until we know it's safe (we find a terminating character)
		char ith_element = get_memory_ptr_for_runtime(offset, i + 1)[i];

		if (ith_element == '\0') return naive_ptr;
		i++;
	}
}

INLINE char *get_function_from_table(u32 idx, u32 type_id);

// libc/* might need to do some setup for the libc setup
void stub_init(i32 offset);

void runtime_init(void);
void runtime_thd_init(void);

extern __thread uv_loop_t uvio;
static inline uv_loop_t *
runtime_uvio(void)
{ return &uvio; }

static unsigned long long int
rdtsc(void)
{
	unsigned long long int ret = 0;
	unsigned int cycles_lo;
	unsigned int cycles_hi;
	__asm__ volatile ("RDTSC" : "=a" (cycles_lo), "=d" (cycles_hi));
	ret = (unsigned long long int)cycles_hi << 32 | cycles_lo;

	return ret;
}

#endif /* SFRT_RUNTIME_H */