1 //===- llvm/CodeGen/WinEHFuncInfo.h -----------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Data structures and associated state for Windows exception handling schemes.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CODEGEN_WINEHFUNCINFO_H
15 #define LLVM_CODEGEN_WINEHFUNCINFO_H
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/PointerUnion.h"
19 #include "llvm/ADT/SmallVector.h"
33 class MachineBasicBlock;
36 // The following structs respresent the .xdata tables for various
37 // Windows-related EH personalities.
39 using MBBOrBasicBlock = PointerUnion<const BasicBlock *, MachineBasicBlock *>;
41 struct CxxUnwindMapEntry {
43 MBBOrBasicBlock Cleanup;
46 /// Similar to CxxUnwindMapEntry, but supports SEH filters.
47 struct SEHUnwindMapEntry {
48 /// If unwinding continues through this handler, transition to the handler at
49 /// this state. This indexes into SEHUnwindMap.
52 bool IsFinally = false;
54 /// Holds the filter expression function.
55 const Function *Filter = nullptr;
57 /// Holds the __except or __finally basic block.
58 MBBOrBasicBlock Handler;
61 struct WinEHHandlerType {
63 /// The CatchObj starts out life as an LLVM alloca and is eventually turned
66 const AllocaInst *Alloca;
69 GlobalVariable *TypeDescriptor;
70 MBBOrBasicBlock Handler;
73 struct WinEHTryBlockMapEntry {
77 SmallVector<WinEHHandlerType, 1> HandlerArray;
80 enum class ClrHandlerType { Catch, Finally, Fault, Filter };
82 struct ClrEHUnwindMapEntry {
83 MBBOrBasicBlock Handler;
85 int HandlerParentState; ///< Outer handler enclosing this entry's handler
86 int TryParentState; ///< Outer try region enclosing this entry's try region,
87 ///< treating later catches on same try as "outer"
88 ClrHandlerType HandlerType;
91 struct WinEHFuncInfo {
92 DenseMap<const Instruction *, int> EHPadStateMap;
93 DenseMap<const FuncletPadInst *, int> FuncletBaseStateMap;
94 DenseMap<const InvokeInst *, int> InvokeStateMap;
95 DenseMap<MCSymbol *, std::pair<int, MCSymbol *>> LabelToStateMap;
96 SmallVector<CxxUnwindMapEntry, 4> CxxUnwindMap;
97 SmallVector<WinEHTryBlockMapEntry, 4> TryBlockMap;
98 SmallVector<SEHUnwindMapEntry, 4> SEHUnwindMap;
99 SmallVector<ClrEHUnwindMapEntry, 4> ClrEHUnwindMap;
100 int UnwindHelpFrameIdx = std::numeric_limits<int>::max();
101 int PSPSymFrameIdx = std::numeric_limits<int>::max();
103 int getLastStateNumber() const { return CxxUnwindMap.size() - 1; }
105 void addIPToStateRange(const InvokeInst *II, MCSymbol *InvokeBegin,
106 MCSymbol *InvokeEnd);
108 int EHRegNodeFrameIndex = std::numeric_limits<int>::max();
109 int EHRegNodeEndOffset = std::numeric_limits<int>::max();
110 int EHGuardFrameIndex = std::numeric_limits<int>::max();
111 int SEHSetFrameOffset = std::numeric_limits<int>::max();
116 /// Analyze the IR in ParentFn and it's handlers to build WinEHFuncInfo, which
117 /// describes the state numbers and tables used by __CxxFrameHandler3. This
118 /// analysis assumes that WinEHPrepare has already been run.
119 void calculateWinCXXEHStateNumbers(const Function *ParentFn,
120 WinEHFuncInfo &FuncInfo);
122 void calculateSEHStateNumbers(const Function *ParentFn,
123 WinEHFuncInfo &FuncInfo);
125 void calculateClrEHStateNumbers(const Function *Fn, WinEHFuncInfo &FuncInfo);
127 } // end namespace llvm
129 #endif // LLVM_CODEGEN_WINEHFUNCINFO_H