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/*
* Copyright 2017 WebAssembly Community Group participants
*
* 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.
*/
//
// Instruments the build with code to log execution at each function
// entry and loop header. This can be useful in debugging, to log out
// a trace, and diff it to another (running in another browser, to
// check for bugs, for example).
//
// The logging is performed by calling an ffi with an id for each
// call site. You need to provide that import on the JS side.
//
#include <wasm.h>
#include <wasm-builder.h>
#include <pass.h>
#include "shared-constants.h"
#include "asmjs/shared-constants.h"
#include "asm_v_wasm.h"
namespace wasm {
Name LOGGER("log_execution");
struct LogExecution : public WalkerPass<PostWalker<LogExecution>> {
void visitLoop(Loop* curr) {
curr->body = makeLogCall(curr->body);
}
void visitFunction(Function* curr) {
curr->body = makeLogCall(curr->body);
}
void visitModule(Module *curr) {
// Add the import
auto import = new Import;
import->name = LOGGER;
import->module = ENV;
import->base = LOGGER;
import->functionType = ensureFunctionType("vi", curr)->name;
import->kind = ExternalKind::Function;
curr->addImport(import);
}
private:
Expression* makeLogCall(Expression* curr) {
static Index id = 0;
Builder builder(*getModule());
return builder.makeSequence(
builder.makeCallImport(
LOGGER,
{ builder.makeConst(Literal(int32_t(id++))) },
none
),
curr
);
}
};
Pass *createLogExecutionPass() {
return new LogExecution();
}
} // namespace wasm
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