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41c7e96f1a
* In order to prevent ArrayBuffers from getting garbage collected by V8, we used to store a v8::Persistent<ArrayBuffer> in a map. This patch introduces a custom ArrayBuffer allocator which doesn't use Persistent handles, but instead stores a pointer to the actual ArrayBuffer data alongside with a reference count. Since creating Persistent handles has quite a bit of overhead, this change significantly increases performance. Various HTTP server benchmarks report about 5-10% more requests per second than before. * Previously the Persistent handle that prevented garbage collection had to be released manually, and this wasn't always done, which was causing memory leaks. This has been resolved by introducing a new `PinnedBuf` type in both Rust and C++ that automatically re-enables garbage collection when it goes out of scope. * Zero-copy buffers are now correctly wrapped in an Option if there is a possibility that they're not present. This clears up a correctness issue where we were creating zero-length slices from a null pointer, which is against the rules.
125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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#ifndef DENO_H_
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#define DENO_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "buffer.h"
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// Neither Rust nor Go support calling directly into C++ functions, therefore
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// the public interface to libdeno is done in C.
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef deno::PinnedBuf::Raw deno_pinned_buf;
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// Data that gets transmitted.
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typedef struct {
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uint8_t* alloc_ptr; // Start of memory allocation (from `new uint8_t[len]`).
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size_t alloc_len; // Length of the memory allocation.
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uint8_t* data_ptr; // Start of logical contents (within the allocation).
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size_t data_len; // Length of logical contents.
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} deno_buf;
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typedef struct {
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uint8_t* data_ptr;
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size_t data_len;
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} deno_snapshot;
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typedef struct deno_s Deno;
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// A callback to receive a message from a libdeno.send() javascript call.
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// control_buf is valid for only for the lifetime of this callback.
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// data_buf is valid until deno_respond() is called.
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typedef void (*deno_recv_cb)(void* user_data, deno_buf control_buf,
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deno_pinned_buf zero_copy_buf);
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void deno_init();
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const char* deno_v8_version();
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void deno_set_v8_flags(int* argc, char** argv);
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typedef struct {
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int will_snapshot; // Default 0. If calling deno_snapshot_new 1.
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deno_snapshot load_snapshot; // A startup snapshot to use.
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deno_buf shared; // Shared buffer to be mapped to libdeno.shared
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deno_recv_cb recv_cb; // Maps to libdeno.send() calls.
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} deno_config;
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// Create a new deno isolate.
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// Warning: If config.will_snapshot is set, deno_snapshot_new() must be called
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// or an error will result.
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Deno* deno_new(deno_config config);
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void deno_delete(Deno* d);
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// Generate a snapshot. The resulting buf can be used in as the load_snapshot
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// member in deno_confg.
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// When calling this function, the caller must have created the isolate "d" with
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// "will_snapshot" set to 1.
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// The caller must free the returned data with deno_snapshot_delete().
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deno_snapshot deno_snapshot_new(Deno* d);
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// Only for use with data returned from deno_snapshot_new.
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void deno_snapshot_delete(deno_snapshot);
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void deno_lock(Deno* d);
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void deno_unlock(Deno* d);
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// Compile and execute a traditional JavaScript script that does not use
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// module import statements.
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// If it succeeded deno_last_exception() will return NULL.
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void deno_execute(Deno* d, void* user_data, const char* js_filename,
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const char* js_source);
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// deno_respond sends up to one message back for every deno_recv_cb made.
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//
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// If this is called during deno_recv_cb, the issuing libdeno.send() in
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// javascript will synchronously return the specified buf as an ArrayBuffer (or
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// null if buf is empty).
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//
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// If this is called after deno_recv_cb has returned, the deno_respond
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// will call into the JS callback specified by libdeno.recv().
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//
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// (Ideally, but not currently: After calling deno_respond(), the caller no
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// longer owns `buf` and must not use it; deno_respond() is responsible for
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// releasing its memory.)
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//
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// If a JS exception was encountered, deno_last_exception() will be non-NULL.
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void deno_respond(Deno* d, void* user_data, deno_buf buf);
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// consumes zero_copy
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void deno_pinned_buf_delete(deno_pinned_buf* buf);
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void deno_check_promise_errors(Deno* d);
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const char* deno_last_exception(Deno* d);
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void deno_terminate_execution(Deno* d);
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// Module API
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typedef int deno_mod;
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// Returns zero on error - check deno_last_exception().
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deno_mod deno_mod_new(Deno* d, bool main, const char* name, const char* source);
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size_t deno_mod_imports_len(Deno* d, deno_mod id);
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// Returned pointer is valid for the lifetime of the Deno isolate "d".
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const char* deno_mod_imports_get(Deno* d, deno_mod id, size_t index);
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typedef deno_mod (*deno_resolve_cb)(void* user_data, const char* specifier,
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deno_mod referrer);
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// If it succeeded deno_last_exception() will return NULL.
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void deno_mod_instantiate(Deno* d, void* user_data, deno_mod id,
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deno_resolve_cb cb);
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// If it succeeded deno_last_exception() will return NULL.
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void deno_mod_evaluate(Deno* d, void* user_data, deno_mod id);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // DENO_H_
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