| 1 | //===- bolt/Passes/DataflowAnalysis.cpp -----------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This file implements functions and classes used for data-flow analysis. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "bolt/Passes/DataflowAnalysis.h" |
| 14 | #include "llvm/MC/MCRegisterInfo.h" |
| 15 | |
| 16 | #define DEBUG_TYPE "dataflow" |
| 17 | |
| 18 | namespace llvm { |
| 19 | |
| 20 | raw_ostream &operator<<(raw_ostream &OS, const BitVector &State) { |
| 21 | LLVM_DEBUG({ |
| 22 | OS << "BitVector("; |
| 23 | const char *Sep = ""; |
| 24 | if (State.count() > (State.size() >> 1)) { |
| 25 | OS << "all, except: "; |
| 26 | BitVector BV = State; |
| 27 | BV.flip(); |
| 28 | for (int I : BV.set_bits()) { |
| 29 | OS << Sep << I; |
| 30 | Sep = " "; |
| 31 | } |
| 32 | OS << ")"; |
| 33 | return OS; |
| 34 | } |
| 35 | for (int I : State.set_bits()) { |
| 36 | OS << Sep << I; |
| 37 | Sep = " "; |
| 38 | } |
| 39 | OS << ")"; |
| 40 | return OS; |
| 41 | }); |
| 42 | OS << "BitVector"; |
| 43 | return OS; |
| 44 | } |
| 45 | |
| 46 | namespace bolt { |
| 47 | |
| 48 | void doForAllPreds(const BinaryBasicBlock &BB, |
| 49 | std::function<void(ProgramPoint)> Task) { |
| 50 | MCPlusBuilder *MIB = BB.getFunction()->getBinaryContext().MIB.get(); |
| 51 | for (BinaryBasicBlock *Pred : BB.predecessors()) { |
| 52 | if (Pred->isValid()) |
| 53 | Task(ProgramPoint::getLastPointAt(BB&: *Pred)); |
| 54 | } |
| 55 | if (!BB.isLandingPad()) |
| 56 | return; |
| 57 | for (BinaryBasicBlock *Thrower : BB.throwers()) { |
| 58 | for (MCInst &Inst : *Thrower) { |
| 59 | if (!MIB->isInvoke(Inst)) |
| 60 | continue; |
| 61 | const std::optional<MCPlus::MCLandingPad> EHInfo = MIB->getEHInfo(Inst); |
| 62 | if (!EHInfo || EHInfo->first != BB.getLabel()) |
| 63 | continue; |
| 64 | Task(ProgramPoint(&Inst)); |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | /// Operates on all successors of a basic block. |
| 70 | void doForAllSuccs(const BinaryBasicBlock &BB, |
| 71 | std::function<void(ProgramPoint)> Task) { |
| 72 | for (BinaryBasicBlock *Succ : BB.successors()) |
| 73 | if (Succ->isValid()) |
| 74 | Task(ProgramPoint::getFirstPointAt(BB&: *Succ)); |
| 75 | } |
| 76 | |
| 77 | void RegStatePrinter::print(raw_ostream &OS, const BitVector &State) const { |
| 78 | if (State.all()) { |
| 79 | OS << "(all)"; |
| 80 | return; |
| 81 | } |
| 82 | if (State.count() > (State.size() >> 1)) { |
| 83 | OS << "all, except: "; |
| 84 | BitVector BV = State; |
| 85 | BV.flip(); |
| 86 | for (int I : BV.set_bits()) |
| 87 | OS << BC.MRI->getName(RegNo: I) << " "; |
| 88 | return; |
| 89 | } |
| 90 | for (int I : State.set_bits()) |
| 91 | OS << BC.MRI->getName(RegNo: I) << " "; |
| 92 | } |
| 93 | |
| 94 | } // namespace bolt |
| 95 | } // namespace llvm |
| 96 |