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//===--- ConstantPropagation.cpp - Constant fold and diagnose overflows ---===//
//
// 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
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "constant-propagation"
#include "swift/SILOptimizer/PassManager/Transforms.h"
#include "swift/SILOptimizer/Utils/SILOptFunctionBuilder.h"
#include "swift/SILOptimizer/Utils/ConstantFolding.h"
using namespace swift;
//===----------------------------------------------------------------------===//
// Top Level Driver
//===----------------------------------------------------------------------===//
namespace {
class ConstantPropagation : public SILFunctionTransform {
bool EnableDiagnostics;
public:
ConstantPropagation(bool EnableDiagnostics) :
EnableDiagnostics(EnableDiagnostics) {}
private:
/// The entry point to the transformation.
void run() override {
SILOptFunctionBuilder FuncBuilder(*this);
ConstantFolder Folder(FuncBuilder, getOptions().AssertConfig,
EnableDiagnostics);
Folder.initializeWorklist(*getFunction());
auto Invalidation = Folder.processWorkList();
if (Invalidation != SILAnalysis::InvalidationKind::Nothing) {
invalidateAnalysis(Invalidation);
}
}
};
} // end anonymous namespace
SILTransform *swift::createDiagnosticConstantPropagation() {
// Diagnostic propagation is rerun on deserialized SIL because it is sensitive
// to assert configuration.
return new ConstantPropagation(true /*enable diagnostics*/);
}
SILTransform *swift::createPerformanceConstantPropagation() {
return new ConstantPropagation(false /*disable diagnostics*/);
}
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