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//===- DataFlowFramework.cpp - A generic framework for data-flow analysis -===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "mlir/Analysis/DataFlowFramework.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "dataflow"
#if LLVM_ENABLE_ABI_BREAKING_CHECKS
#define DATAFLOW_DEBUG(X) LLVM_DEBUG(X)
#else
#define DATAFLOW_DEBUG(X)
#endif // LLVM_ENABLE_ABI_BREAKING_CHECKS
using namespace mlir;
//===----------------------------------------------------------------------===//
// GenericProgramPoint
//===----------------------------------------------------------------------===//
GenericProgramPoint::~GenericProgramPoint() = default;
//===----------------------------------------------------------------------===//
// AnalysisState
//===----------------------------------------------------------------------===//
AnalysisState::~AnalysisState() = default;
void AnalysisState::addDependency(ProgramPoint dependent,
DataFlowAnalysis *analysis) {
auto inserted = dependents.insert({dependent, analysis});
(void)inserted;
DATAFLOW_DEBUG({
if (inserted) {
llvm::dbgs() << "Creating dependency between " << debugName << " of "
<< point << "\nand " << debugName << " on " << dependent
<< "\n";
}
});
}
void AnalysisState::dump() const { print(llvm::errs()); }
//===----------------------------------------------------------------------===//
// ProgramPoint
//===----------------------------------------------------------------------===//
void ProgramPoint::print(raw_ostream &os) const {
if (isNull()) {
os << "<NULL POINT>";
return;
}
if (auto *programPoint = llvm::dyn_cast<GenericProgramPoint *>(*this))
return programPoint->print(os);
if (auto *op = llvm::dyn_cast<Operation *>(*this))
return op->print(os, OpPrintingFlags().skipRegions());
if (auto value = llvm::dyn_cast<Value>(*this))
return value.print(os, OpPrintingFlags().skipRegions());
return get<Block *>()->print(os);
}
Location ProgramPoint::getLoc() const {
if (auto *programPoint = llvm::dyn_cast<GenericProgramPoint *>(*this))
return programPoint->getLoc();
if (auto *op = llvm::dyn_cast<Operation *>(*this))
return op->getLoc();
if (auto value = llvm::dyn_cast<Value>(*this))
return value.getLoc();
return get<Block *>()->getParent()->getLoc();
}
//===----------------------------------------------------------------------===//
// DataFlowSolver
//===----------------------------------------------------------------------===//
LogicalResult DataFlowSolver::initializeAndRun(Operation *top) {
// Initialize the analyses.
for (DataFlowAnalysis &analysis : llvm::make_pointee_range(childAnalyses)) {
DATAFLOW_DEBUG(llvm::dbgs()
<< "Priming analysis: " << analysis.debugName << "\n");
if (failed(analysis.initialize(top)))
return failure();
}
// Run the analysis until fixpoint.
do {
// Exhaust the worklist.
while (!worklist.empty()) {
auto [point, analysis] = worklist.front();
worklist.pop();
DATAFLOW_DEBUG(llvm::dbgs() << "Invoking '" << analysis->debugName
<< "' on: " << point << "\n");
if (failed(analysis->visit(point)))
return failure();
}
// Iterate until all states are in some initialized state and the worklist
// is exhausted.
} while (!worklist.empty());
return success();
}
void DataFlowSolver::propagateIfChanged(AnalysisState *state,
ChangeResult changed) {
if (changed == ChangeResult::Change) {
DATAFLOW_DEBUG(llvm::dbgs() << "Propagating update to " << state->debugName
<< " of " << state->point << "\n"
<< "Value: " << *state << "\n");
state->onUpdate(this);
}
}
//===----------------------------------------------------------------------===//
// DataFlowAnalysis
//===----------------------------------------------------------------------===//
DataFlowAnalysis::~DataFlowAnalysis() = default;
DataFlowAnalysis::DataFlowAnalysis(DataFlowSolver &solver) : solver(solver) {}
void DataFlowAnalysis::addDependency(AnalysisState *state, ProgramPoint point) {
state->addDependency(point, this);
}
void DataFlowAnalysis::propagateIfChanged(AnalysisState *state,
ChangeResult changed) {
solver.propagateIfChanged(state, changed);
}
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