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//===--- llvm/CodeGen/WasmEHFuncInfo.h --------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Data structures for Wasm exception handling schemes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_WASMEHFUNCINFO_H
#define LLVM_CODEGEN_WASMEHFUNCINFO_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/SmallPtrSet.h"
namespace llvm {
class BasicBlock;
class Function;
class MachineBasicBlock;
namespace WebAssembly {
enum Tag { CPP_EXCEPTION = 0, C_LONGJMP = 1 };
}
using BBOrMBB = PointerUnion<const BasicBlock *, MachineBasicBlock *>;
struct WasmEHFuncInfo {
// When there is an entry <A, B>, if an exception is not caught by A, it
// should next unwind to the EH pad B.
DenseMap<BBOrMBB, BBOrMBB> SrcToUnwindDest;
DenseMap<BBOrMBB, SmallPtrSet<BBOrMBB, 4>> UnwindDestToSrcs; // reverse map
// Helper functions
const BasicBlock *getUnwindDest(const BasicBlock *BB) const {
assert(hasUnwindDest(BB));
return SrcToUnwindDest.lookup(BB).get<const BasicBlock *>();
}
SmallPtrSet<const BasicBlock *, 4> getUnwindSrcs(const BasicBlock *BB) const {
assert(hasUnwindSrcs(BB));
const auto &Set = UnwindDestToSrcs.lookup(BB);
SmallPtrSet<const BasicBlock *, 4> Ret;
for (const auto P : Set)
Ret.insert(P.get<const BasicBlock *>());
return Ret;
}
void setUnwindDest(const BasicBlock *BB, const BasicBlock *Dest) {
SrcToUnwindDest[BB] = Dest;
if (!UnwindDestToSrcs.count(Dest))
UnwindDestToSrcs[Dest] = SmallPtrSet<BBOrMBB, 4>();
UnwindDestToSrcs[Dest].insert(BB);
}
bool hasUnwindDest(const BasicBlock *BB) const {
return SrcToUnwindDest.count(BB);
}
bool hasUnwindSrcs(const BasicBlock *BB) const {
return UnwindDestToSrcs.count(BB);
}
MachineBasicBlock *getUnwindDest(MachineBasicBlock *MBB) const {
assert(hasUnwindDest(MBB));
return SrcToUnwindDest.lookup(MBB).get<MachineBasicBlock *>();
}
SmallPtrSet<MachineBasicBlock *, 4>
getUnwindSrcs(MachineBasicBlock *MBB) const {
assert(hasUnwindSrcs(MBB));
const auto &Set = UnwindDestToSrcs.lookup(MBB);
SmallPtrSet<MachineBasicBlock *, 4> Ret;
for (const auto P : Set)
Ret.insert(P.get<MachineBasicBlock *>());
return Ret;
}
void setUnwindDest(MachineBasicBlock *MBB, MachineBasicBlock *Dest) {
SrcToUnwindDest[MBB] = Dest;
if (!UnwindDestToSrcs.count(Dest))
UnwindDestToSrcs[Dest] = SmallPtrSet<BBOrMBB, 4>();
UnwindDestToSrcs[Dest].insert(MBB);
}
bool hasUnwindDest(MachineBasicBlock *MBB) const {
return SrcToUnwindDest.count(MBB);
}
bool hasUnwindSrcs(MachineBasicBlock *MBB) const {
return UnwindDestToSrcs.count(MBB);
}
};
// Analyze the IR in the given function to build WasmEHFuncInfo.
void calculateWasmEHInfo(const Function *F, WasmEHFuncInfo &EHInfo);
} // namespace llvm
#endif // LLVM_CODEGEN_WASMEHFUNCINFO_H
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