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  1. //===- llvm/CodeGen/WinEHFuncInfo.h -----------------------------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. // Data structures and associated state for Windows exception handling schemes.
  10. //
  11. //===----------------------------------------------------------------------===//
  12.  
  13. #ifndef LLVM_CODEGEN_WINEHFUNCINFO_H
  14. #define LLVM_CODEGEN_WINEHFUNCINFO_H
  15.  
  16. #include "llvm/ADT/DenseMap.h"
  17. #include "llvm/ADT/PointerUnion.h"
  18. #include "llvm/ADT/SmallVector.h"
  19. #include <cstdint>
  20. #include <limits>
  21. #include <utility>
  22.  
  23. namespace llvm {
  24.  
  25. class AllocaInst;
  26. class BasicBlock;
  27. class FuncletPadInst;
  28. class Function;
  29. class GlobalVariable;
  30. class Instruction;
  31. class InvokeInst;
  32. class MachineBasicBlock;
  33. class MCSymbol;
  34.  
  35. // The following structs respresent the .xdata tables for various
  36. // Windows-related EH personalities.
  37.  
  38. using MBBOrBasicBlock = PointerUnion<const BasicBlock *, MachineBasicBlock *>;
  39.  
  40. struct CxxUnwindMapEntry {
  41.   int ToState;
  42.   MBBOrBasicBlock Cleanup;
  43. };
  44.  
  45. /// Similar to CxxUnwindMapEntry, but supports SEH filters.
  46. struct SEHUnwindMapEntry {
  47.   /// If unwinding continues through this handler, transition to the handler at
  48.   /// this state. This indexes into SEHUnwindMap.
  49.   int ToState = -1;
  50.  
  51.   bool IsFinally = false;
  52.  
  53.   /// Holds the filter expression function.
  54.   const Function *Filter = nullptr;
  55.  
  56.   /// Holds the __except or __finally basic block.
  57.   MBBOrBasicBlock Handler;
  58. };
  59.  
  60. struct WinEHHandlerType {
  61.   int Adjectives;
  62.   /// The CatchObj starts out life as an LLVM alloca and is eventually turned
  63.   /// frame index.
  64.   union {
  65.     const AllocaInst *Alloca;
  66.     int FrameIndex;
  67.   } CatchObj = {};
  68.   GlobalVariable *TypeDescriptor;
  69.   MBBOrBasicBlock Handler;
  70. };
  71.  
  72. struct WinEHTryBlockMapEntry {
  73.   int TryLow = -1;
  74.   int TryHigh = -1;
  75.   int CatchHigh = -1;
  76.   SmallVector<WinEHHandlerType, 1> HandlerArray;
  77. };
  78.  
  79. enum class ClrHandlerType { Catch, Finally, Fault, Filter };
  80.  
  81. struct ClrEHUnwindMapEntry {
  82.   MBBOrBasicBlock Handler;
  83.   uint32_t TypeToken;
  84.   int HandlerParentState; ///< Outer handler enclosing this entry's handler
  85.   int TryParentState; ///< Outer try region enclosing this entry's try region,
  86.                       ///< treating later catches on same try as "outer"
  87.   ClrHandlerType HandlerType;
  88. };
  89.  
  90. struct WinEHFuncInfo {
  91.   DenseMap<const Instruction *, int> EHPadStateMap;
  92.   DenseMap<const FuncletPadInst *, int> FuncletBaseStateMap;
  93.   DenseMap<const InvokeInst *, int> InvokeStateMap;
  94.   DenseMap<MCSymbol *, std::pair<int, MCSymbol *>> LabelToStateMap;
  95.   SmallVector<CxxUnwindMapEntry, 4> CxxUnwindMap;
  96.   SmallVector<WinEHTryBlockMapEntry, 4> TryBlockMap;
  97.   SmallVector<SEHUnwindMapEntry, 4> SEHUnwindMap;
  98.   SmallVector<ClrEHUnwindMapEntry, 4> ClrEHUnwindMap;
  99.   int UnwindHelpFrameIdx = std::numeric_limits<int>::max();
  100.   int PSPSymFrameIdx = std::numeric_limits<int>::max();
  101.  
  102.   int getLastStateNumber() const { return CxxUnwindMap.size() - 1; }
  103.  
  104.   void addIPToStateRange(const InvokeInst *II, MCSymbol *InvokeBegin,
  105.                          MCSymbol *InvokeEnd);
  106.  
  107.   int EHRegNodeFrameIndex = std::numeric_limits<int>::max();
  108.   int EHRegNodeEndOffset = std::numeric_limits<int>::max();
  109.   int EHGuardFrameIndex = std::numeric_limits<int>::max();
  110.   int SEHSetFrameOffset = std::numeric_limits<int>::max();
  111.  
  112.   WinEHFuncInfo();
  113. };
  114.  
  115. /// Analyze the IR in ParentFn and it's handlers to build WinEHFuncInfo, which
  116. /// describes the state numbers and tables used by __CxxFrameHandler3. This
  117. /// analysis assumes that WinEHPrepare has already been run.
  118. void calculateWinCXXEHStateNumbers(const Function *ParentFn,
  119.                                    WinEHFuncInfo &FuncInfo);
  120.  
  121. void calculateSEHStateNumbers(const Function *ParentFn,
  122.                               WinEHFuncInfo &FuncInfo);
  123.  
  124. void calculateClrEHStateNumbers(const Function *Fn, WinEHFuncInfo &FuncInfo);
  125.  
  126. } // end namespace llvm
  127.  
  128. #endif // LLVM_CODEGEN_WINEHFUNCINFO_H
  129.