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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <emscripten/emscripten.h>
#include <cstdint>
#include "src/trace_processor/rpc/rpc.h"
namespace perfetto::trace_processor {
namespace {
Rpc* g_trace_processor_rpc;
// The buffer used to pass the request arguments. The caller (JS) decides how
// big this buffer should be in the Initialize() call.
uint8_t* g_req_buf;
} // namespace
// +---------------------------------------------------------------------------+
// | Exported functions called by the JS/TS running in the worker. |
// +---------------------------------------------------------------------------+
extern "C" {
// Returns the address of the allocated request buffer.
uint8_t* EMSCRIPTEN_KEEPALIVE trace_processor_rpc_init(Rpc::RpcResponseFunction,
uint32_t);
uint8_t* trace_processor_rpc_init(Rpc::RpcResponseFunction resp_function,
uint32_t req_buffer_size) {
g_trace_processor_rpc = new Rpc();
// |resp_function| is a JS-bound function passed by wasm_bridge.ts. It will
// call back into JavaScript. There the JS code will copy the passed
// buffer with the response (a proto-encoded TraceProcessorRpc message) and
// postMessage() it to the controller. See the comment in wasm_bridge.ts for
// an overview of the JS<>Wasm callstack.
g_trace_processor_rpc->SetRpcResponseFunction(resp_function);
g_req_buf = new uint8_t[req_buffer_size];
return g_req_buf;
}
void EMSCRIPTEN_KEEPALIVE trace_processor_on_rpc_request(uint32_t);
void trace_processor_on_rpc_request(uint32_t size) {
g_trace_processor_rpc->OnRpcRequest(g_req_buf, size);
}
} // extern "C"
} // namespace perfetto::trace_processor
int main(int, char**) {
// This is unused but is needed for the following reasons:
// - We need the callMain() Emscripten JS helper function for traceconv (but
// not for trace_processor).
// - Newer versions of emscripten require that callMain is explicitly exported
// via EXTRA_EXPORTED_RUNTIME_METHODS = ['callMain'].
// - We have one set of EXTRA_EXPORTED_RUNTIME_METHODS for both
// trace_processor.wasm (which does not need a main()) and traceconv (which
// does).
// - Without this main(), the Wasm bootstrap code will cause a JS error at
// runtime when trying to load trace_processor.js.
return 0;
}
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