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bddc69c8a6
The XXOptUtils.h convention is already established and parallels the SIL/XXUtils convention. New: - InstOptUtils.h - CFGOptUtils.h - BasicBlockOptUtils.h - ValueLifetime.h Removed: - Local.h - Two conflicting CFG.h files This reorganization is helpful before I introduce more utilities for block cloning similar to SinkAddressProjections. Move the control flow utilies out of Local.h, which was an unreadable, unprincipled mess. Rename it to InstOptUtils.h, and confine it to small APIs for working with individual instructions. These are the optimizer's additions to /SIL/InstUtils.h. Rename CFG.h to CFGOptUtils.h and remove the one in /Analysis. Now there is only SIL/CFG.h, resolving the naming conflict within the swift project (this has always been a problem for source tools). Limit this header to low-level APIs for working with branches and CFG edges. Add BasicBlockOptUtils.h for block level transforms (it makes me sad that I can't use BBOptUtils.h, but SIL already has BasicBlockUtils.h). These are larger APIs for cloning or removing whole blocks.
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
//===--- AssumeSingleThreaded.cpp - Assume single-threaded execution -----===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Assume that user code is single-thread.
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//
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// Convert all reference counting operations into non-atomic ones.
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//
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// To get read of most atomic reference counting operations, the standard
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// library should be compiled in this mode as well
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//
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// This pass affects only reference counting operations resulting from SIL
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// instructions. It wouldn't affect places in the runtime C++ code which
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// hard-code calls to retain/release. We could take advantage of the Instruments
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// instrumentation stubs to redirect calls from the runtime if it was
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// significant, or else just build a single-threaded variant of the runtime.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/SIL/SILFunction.h"
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#include "swift/SIL/SILInstruction.h"
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#include "swift/SIL/SILModule.h"
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#include "swift/SILOptimizer/PassManager/Passes.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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#include "swift/SILOptimizer/Utils/InstOptUtils.h"
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#include "llvm/Support/CommandLine.h"
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using namespace swift;
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namespace {
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class AssumeSingleThreaded : public swift::SILFunctionTransform {
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/// The entry point to the transformation.
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void run() override {
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if (!getOptions().AssumeSingleThreaded)
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return;
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for (auto &BB : *getFunction()) {
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for (auto &I : BB) {
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if (auto RCInst = dyn_cast<RefCountingInst>(&I))
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RCInst->setNonAtomic();
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}
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}
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invalidateAnalysis(SILAnalysis::InvalidationKind::Instructions);
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}
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};
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} // end anonymous namespace
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SILTransform *swift::createAssumeSingleThreaded() {
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return new AssumeSingleThreaded();
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}
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