Coverage Report

Created: 2019-02-21 13:17

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/include/llvm/CodeGen/WasmEHFuncInfo.h
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//===--- llvm/CodeGen/WasmEHFuncInfo.h --------------------------*- C++ -*-===//
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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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// Data structures for Wasm exception handling schemes.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_WASMEHFUNCINFO_H
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#define LLVM_CODEGEN_WASMEHFUNCINFO_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/IR/BasicBlock.h"
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namespace llvm {
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enum EventTag { CPP_EXCEPTION = 0, C_LONGJMP = 1 };
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using BBOrMBB = PointerUnion<const BasicBlock *, MachineBasicBlock *>;
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struct WasmEHFuncInfo {
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  // When there is an entry <A, B>, if an exception is not caught by A, it
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  // should next unwind to the EH pad B.
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  DenseMap<BBOrMBB, BBOrMBB> EHPadUnwindMap;
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  // For entry <A, B>, A is a BB with an instruction that may throw
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  // (invoke/cleanupret in LLVM IR, call/rethrow in the backend) and B is an EH
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  // pad that A unwinds to.
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  DenseMap<BBOrMBB, BBOrMBB> ThrowUnwindMap;
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  // Helper functions
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  const BasicBlock *getEHPadUnwindDest(const BasicBlock *BB) const {
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    return EHPadUnwindMap.lookup(BB).get<const BasicBlock *>();
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  }
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  void setEHPadUnwindDest(const BasicBlock *BB, const BasicBlock *Dest) {
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    EHPadUnwindMap[BB] = Dest;
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  }
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  const BasicBlock *getThrowUnwindDest(BasicBlock *BB) const {
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    return ThrowUnwindMap.lookup(BB).get<const BasicBlock *>();
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  }
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  void setThrowUnwindDest(const BasicBlock *BB, const BasicBlock *Dest) {
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    ThrowUnwindMap[BB] = Dest;
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  }
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  bool hasEHPadUnwindDest(const BasicBlock *BB) const {
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    return EHPadUnwindMap.count(BB);
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  }
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  bool hasThrowUnwindDest(const BasicBlock *BB) const {
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    return ThrowUnwindMap.count(BB);
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  }
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  MachineBasicBlock *getEHPadUnwindDest(MachineBasicBlock *MBB) const {
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    return EHPadUnwindMap.lookup(MBB).get<MachineBasicBlock *>();
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  }
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  void setEHPadUnwindDest(MachineBasicBlock *MBB, MachineBasicBlock *Dest) {
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    EHPadUnwindMap[MBB] = Dest;
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  }
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  MachineBasicBlock *getThrowUnwindDest(MachineBasicBlock *MBB) const {
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    return ThrowUnwindMap.lookup(MBB).get<MachineBasicBlock *>();
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  }
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  void setThrowUnwindDest(MachineBasicBlock *MBB, MachineBasicBlock *Dest) {
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    ThrowUnwindMap[MBB] = Dest;
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  }
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  bool hasEHPadUnwindDest(MachineBasicBlock *MBB) const {
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    return EHPadUnwindMap.count(MBB);
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  }
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  bool hasThrowUnwindDest(MachineBasicBlock *MBB) const {
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    return ThrowUnwindMap.count(MBB);
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  }
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};
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// Analyze the IR in the given function to build WasmEHFuncInfo.
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void calculateWasmEHInfo(const Function *F, WasmEHFuncInfo &EHInfo);
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} // namespace llvm
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#endif // LLVM_CODEGEN_WASMEHFUNCINFO_H