mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
//===--- AssumeSingleThreaded.cpp - Assume single-threaded execution -----===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See https://swift.org/LICENSE.txt for license information
|
|
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Assume that user code is single-thread.
|
|
//
|
|
// Convert all reference counting operations into non-atomic ones.
|
|
//
|
|
// To get read of most atomic reference counting operations, the standard
|
|
// library should be compiled in this mode as well
|
|
//
|
|
// This pass affects only reference counting operations resulting from SIL
|
|
// instructions. It wouldn't affect places in the runtime C++ code which
|
|
// hard-code calls to retain/release. We could take advantage of the Instruments
|
|
// instrumentation stubs to redirect calls from the runtime if it was
|
|
// significant, or else just build a single-threaded variant of the runtime.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "swift/SILOptimizer/PassManager/Passes.h"
|
|
#include "swift/SIL/SILFunction.h"
|
|
#include "swift/SIL/SILInstruction.h"
|
|
#include "swift/SIL/SILModule.h"
|
|
#include "swift/SILOptimizer/Utils/Local.h"
|
|
#include "swift/SILOptimizer/PassManager/Transforms.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
|
|
using namespace swift;
|
|
|
|
namespace {
|
|
class AssumeSingleThreaded : public swift::SILFunctionTransform {
|
|
/// The entry point to the transformation.
|
|
void run() override {
|
|
if (!getOptions().AssumeSingleThreaded)
|
|
return;
|
|
for (auto &BB : *getFunction()) {
|
|
for (auto &I : BB) {
|
|
if (auto RCInst = dyn_cast<RefCountingInst>(&I))
|
|
RCInst->setNonAtomic();
|
|
}
|
|
}
|
|
invalidateAnalysis(SILAnalysis::InvalidationKind::Instructions);
|
|
}
|
|
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
|
|
SILTransform *swift::createAssumeSingleThreaded() {
|
|
return new AssumeSingleThreaded();
|
|
}
|