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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
#ifndef DENO_H_
#define DENO_H_
#include <stddef.h>
#include <stdint.h>
// Neither Rust nor Go support calling directly into C++ functions, therefore
// the public interface to libdeno is done in C.
#ifdef __cplusplus
extern "C" {
#endif
// Data that gets transmitted.
typedef struct {
uint8_t* alloc_ptr; // Start of memory allocation (returned from `malloc()`).
size_t alloc_len; // Length of the memory allocation.
uint8_t* data_ptr; // Start of logical contents (within the allocation).
size_t data_len; // Length of logical contents.
} deno_buf;
typedef struct deno_s Deno;
// A callback to receive a message from a libdeno.send() javascript call.
// control_buf is valid for only for the lifetime of this callback.
// data_buf is valid until deno_respond() is called.
typedef void (*deno_recv_cb)(void* user_data, int32_t req_id,
deno_buf control_buf, deno_buf data_buf);
void deno_init();
const char* deno_v8_version();
void deno_set_v8_flags(int* argc, char** argv);
typedef struct {
int will_snapshot; // Default 0. If calling deno_get_snapshot 1.
deno_buf load_snapshot; // Optionally: A deno_buf from deno_get_snapshot.
deno_buf shared; // Shared buffer to be mapped to libdeno.shared
deno_recv_cb recv_cb; // Maps to libdeno.send() calls.
} deno_config;
// Create a new deno isolate.
// Warning: If config.will_snapshot is set, deno_get_snapshot() must be called
// or an error will result.
Deno* deno_new(deno_config config);
// Generate a snapshot. The resulting buf can be used with deno_new.
// The caller must free the returned data by calling delete[] buf.data_ptr.
deno_buf deno_get_snapshot(Deno* d);
void deno_delete(Deno* d);
// Returns false on error.
// Get error text with deno_last_exception().
// 0 = fail, 1 = success
//
// TODO change return value to be const char*. On success the return
// value is nullptr, on failure it is the JSON exception text that
// is returned by deno_last_exception(). Remove deno_last_exception().
// The return string is valid until the next execution of deno_execute or
// deno_respond (as deno_last_exception is now).
int deno_execute(Deno* d, void* user_data, const char* js_filename,
const char* js_source);
// deno_respond sends up to one message back for every deno_recv_cb made.
//
// If this is called during deno_recv_cb, the issuing libdeno.send() in
// javascript will synchronously return the specified buf as an ArrayBuffer (or
// null if buf is empty).
//
// If this is called after deno_recv_cb has returned, the deno_respond
// will call into the JS callback specified by libdeno.recv().
//
// (Ideally, but not currently: After calling deno_respond(), the caller no
// longer owns `buf` and must not use it; deno_respond() is responsible for
// releasing its memory.)
//
// Calling this function more than once with the same req_id will result in
// an error.
//
// A non-zero return value, means a JS exception was encountered during the
// libdeno.recv() callback. Check deno_last_exception() for exception text.
//
// TODO change return value to be const char*. On success the return
// value is nullptr, on failure it is the JSON exception text that
// is returned by deno_last_exception(). Remove deno_last_exception().
// The return string is valid until the next execution of deno_execute or
// deno_respond (as deno_last_exception is now).
int deno_respond(Deno* d, void* user_data, int32_t req_id, deno_buf buf);
void deno_check_promise_errors(Deno* d);
const char* deno_last_exception(Deno* d);
void deno_terminate_execution(Deno* d);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // DENO_H_
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