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//===--- llvm/CodeGen/WasmEHFuncInfo.h --------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Data structures for Wasm exception handling schemes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_WASMEHFUNCINFO_H
#define LLVM_CODEGEN_WASMEHFUNCINFO_H
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/IR/BasicBlock.h"
namespace llvm {
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> EHPadUnwindMap;
// For entry <A, B>, A is a BB with an instruction that may throw
// (invoke/cleanupret in LLVM IR, call/rethrow in the backend) and B is an EH
// pad that A unwinds to.
DenseMap<BBOrMBB, BBOrMBB> ThrowUnwindMap;
// Helper functions
const BasicBlock *getEHPadUnwindDest(const BasicBlock *BB) const {
return EHPadUnwindMap.lookup(BB).get<const BasicBlock *>();
}
void setEHPadUnwindDest(const BasicBlock *BB, const BasicBlock *Dest) {
EHPadUnwindMap[BB] = Dest;
}
const BasicBlock *getThrowUnwindDest(BasicBlock *BB) const {
return ThrowUnwindMap.lookup(BB).get<const BasicBlock *>();
}
void setThrowUnwindDest(const BasicBlock *BB, const BasicBlock *Dest) {
ThrowUnwindMap[BB] = Dest;
}
bool hasEHPadUnwindDest(const BasicBlock *BB) const {
return EHPadUnwindMap.count(BB);
}
bool hasThrowUnwindDest(const BasicBlock *BB) const {
return ThrowUnwindMap.count(BB);
}
MachineBasicBlock *getEHPadUnwindDest(MachineBasicBlock *MBB) const {
return EHPadUnwindMap.lookup(MBB).get<MachineBasicBlock *>();
}
void setEHPadUnwindDest(MachineBasicBlock *MBB, MachineBasicBlock *Dest) {
EHPadUnwindMap[MBB] = Dest;
}
MachineBasicBlock *getThrowUnwindDest(MachineBasicBlock *MBB) const {
return ThrowUnwindMap.lookup(MBB).get<MachineBasicBlock *>();
}
void setThrowUnwindDest(MachineBasicBlock *MBB, MachineBasicBlock *Dest) {
ThrowUnwindMap[MBB] = Dest;
}
bool hasEHPadUnwindDest(MachineBasicBlock *MBB) const {
return EHPadUnwindMap.count(MBB);
}
bool hasThrowUnwindDest(MachineBasicBlock *MBB) const {
return ThrowUnwindMap.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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