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102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
//===-------- EdgeBundles.cpp - Bundles of CFG edges ----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the implementation of the EdgeBundles analysis.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/EdgeBundles.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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static cl::opt<bool>
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ViewEdgeBundles("view-edge-bundles", cl::Hidden,
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cl::desc("Pop up a window to show edge bundle graphs"));
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char EdgeBundles::ID = 0;
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INITIALIZE_PASS(EdgeBundles, "edge-bundles", "Bundle Machine CFG Edges",
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/* cfg = */true, /* analysis = */ true)
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char &llvm::EdgeBundlesID = EdgeBundles::ID;
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void EdgeBundles::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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bool EdgeBundles::runOnMachineFunction(MachineFunction &mf) {
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MF = &mf;
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EC.clear();
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EC.grow(2 * MF->getNumBlockIDs());
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for (const auto &MBB : *MF) {
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unsigned OutE = 2 * MBB.getNumber() + 1;
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// Join the outgoing bundle with the ingoing bundles of all successors.
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for (MachineBasicBlock::const_succ_iterator SI = MBB.succ_begin(),
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SE = MBB.succ_end(); SI != SE; ++SI)
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EC.join(OutE, 2 * (*SI)->getNumber());
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}
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EC.compress();
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if (ViewEdgeBundles)
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view();
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// Compute the reverse mapping.
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Blocks.clear();
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Blocks.resize(getNumBundles());
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for (unsigned i = 0, e = MF->getNumBlockIDs(); i != e; ++i) {
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unsigned b0 = getBundle(i, false);
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unsigned b1 = getBundle(i, true);
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Blocks[b0].push_back(i);
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if (b1 != b0)
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Blocks[b1].push_back(i);
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}
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return false;
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}
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/// Specialize WriteGraph, the standard implementation won't work.
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namespace llvm {
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template<>
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raw_ostream &WriteGraph<>(raw_ostream &O, const EdgeBundles &G,
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bool ShortNames,
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const Twine &Title) {
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const MachineFunction *MF = G.getMachineFunction();
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O << "digraph {\n";
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for (const auto &MBB : *MF) {
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unsigned BB = MBB.getNumber();
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O << "\t\"" << printMBBReference(MBB) << "\" [ shape=box ]\n"
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<< '\t' << G.getBundle(BB, false) << " -> \"" << printMBBReference(MBB)
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<< "\"\n"
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<< "\t\"" << printMBBReference(MBB) << "\" -> " << G.getBundle(BB, true)
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<< '\n';
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for (MachineBasicBlock::const_succ_iterator SI = MBB.succ_begin(),
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SE = MBB.succ_end(); SI != SE; ++SI)
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O << "\t\"" << printMBBReference(MBB) << "\" -> \""
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<< printMBBReference(**SI) << "\" [ color=lightgray ]\n";
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}
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O << "}\n";
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return O;
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}
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} // end namespace llvm
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/// view - Visualize the annotated bipartite CFG with Graphviz.
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void EdgeBundles::view() const {
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ViewGraph(*this, "EdgeBundles");
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}
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