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f7b0205560
We recently decided to change 'event' to 'tag', and 'event section' to 'tag section', out of the rationale that the section contains a generalized tag that references a type, which may be used for something other than exceptions, and the name 'event' can be confusing in the web context. See - https://github.com/WebAssembly/exception-handling/issues/159#issuecomment-857910130 - https://github.com/WebAssembly/exception-handling/pull/161 Reviewed By: tlively Differential Revision: https://reviews.llvm.org/D104423
97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
//===--- 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/ADT/SmallPtrSet.h"
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namespace llvm {
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class BasicBlock;
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class Function;
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class MachineBasicBlock;
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namespace WebAssembly {
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enum Tag { CPP_EXCEPTION = 0, C_LONGJMP = 1 };
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}
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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> SrcToUnwindDest;
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DenseMap<BBOrMBB, SmallPtrSet<BBOrMBB, 4>> UnwindDestToSrcs; // reverse map
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// Helper functions
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const BasicBlock *getUnwindDest(const BasicBlock *BB) const {
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assert(hasUnwindDest(BB));
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return SrcToUnwindDest.lookup(BB).get<const BasicBlock *>();
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}
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SmallPtrSet<const BasicBlock *, 4> getUnwindSrcs(const BasicBlock *BB) const {
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assert(hasUnwindSrcs(BB));
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const auto &Set = UnwindDestToSrcs.lookup(BB);
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SmallPtrSet<const BasicBlock *, 4> Ret;
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for (const auto P : Set)
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Ret.insert(P.get<const BasicBlock *>());
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return Ret;
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}
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void setUnwindDest(const BasicBlock *BB, const BasicBlock *Dest) {
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SrcToUnwindDest[BB] = Dest;
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if (!UnwindDestToSrcs.count(Dest))
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UnwindDestToSrcs[Dest] = SmallPtrSet<BBOrMBB, 4>();
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UnwindDestToSrcs[Dest].insert(BB);
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}
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bool hasUnwindDest(const BasicBlock *BB) const {
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return SrcToUnwindDest.count(BB);
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}
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bool hasUnwindSrcs(const BasicBlock *BB) const {
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return UnwindDestToSrcs.count(BB);
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}
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MachineBasicBlock *getUnwindDest(MachineBasicBlock *MBB) const {
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assert(hasUnwindDest(MBB));
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return SrcToUnwindDest.lookup(MBB).get<MachineBasicBlock *>();
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}
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SmallPtrSet<MachineBasicBlock *, 4>
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getUnwindSrcs(MachineBasicBlock *MBB) const {
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assert(hasUnwindSrcs(MBB));
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const auto &Set = UnwindDestToSrcs.lookup(MBB);
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SmallPtrSet<MachineBasicBlock *, 4> Ret;
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for (const auto P : Set)
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Ret.insert(P.get<MachineBasicBlock *>());
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return Ret;
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}
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void setUnwindDest(MachineBasicBlock *MBB, MachineBasicBlock *Dest) {
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SrcToUnwindDest[MBB] = Dest;
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if (!UnwindDestToSrcs.count(Dest))
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UnwindDestToSrcs[Dest] = SmallPtrSet<BBOrMBB, 4>();
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UnwindDestToSrcs[Dest].insert(MBB);
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}
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bool hasUnwindDest(MachineBasicBlock *MBB) const {
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return SrcToUnwindDest.count(MBB);
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}
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bool hasUnwindSrcs(MachineBasicBlock *MBB) const {
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return UnwindDestToSrcs.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
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