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annotate include/llvm/Support/PrettyStackTrace.h @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children c2174574ed3a
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1 //===- llvm/Support/PrettyStackTrace.h - Pretty Crash Handling --*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file defines the PrettyStackTraceEntry class, which is used to make
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11 // crashes give more contextual information about what the program was doing
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12 // when it crashed.
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #ifndef LLVM_SUPPORT_PRETTYSTACKTRACE_H
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17 #define LLVM_SUPPORT_PRETTYSTACKTRACE_H
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18
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19 #include "llvm/ADT/SmallVector.h"
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20 #include "llvm/Support/Compiler.h"
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21
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22 namespace llvm {
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23 class raw_ostream;
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24
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25 void EnablePrettyStackTrace();
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26
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27 /// PrettyStackTraceEntry - This class is used to represent a frame of the
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28 /// "pretty" stack trace that is dumped when a program crashes. You can define
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29 /// subclasses of this and declare them on the program stack: when they are
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30 /// constructed and destructed, they will add their symbolic frames to a
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31 /// virtual stack trace. This gets dumped out if the program crashes.
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32 class PrettyStackTraceEntry {
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33 friend PrettyStackTraceEntry *ReverseStackTrace(PrettyStackTraceEntry *);
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34
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35 PrettyStackTraceEntry *NextEntry;
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36 PrettyStackTraceEntry(const PrettyStackTraceEntry &) = delete;
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37 void operator=(const PrettyStackTraceEntry &) = delete;
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38 public:
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39 PrettyStackTraceEntry();
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40 virtual ~PrettyStackTraceEntry();
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41
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42 /// print - Emit information about this stack frame to OS.
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43 virtual void print(raw_ostream &OS) const = 0;
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44
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45 /// getNextEntry - Return the next entry in the list of frames.
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46 const PrettyStackTraceEntry *getNextEntry() const { return NextEntry; }
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47 };
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48
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49 /// PrettyStackTraceString - This object prints a specified string (which
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50 /// should not contain newlines) to the stream as the stack trace when a crash
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51 /// occurs.
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52 class PrettyStackTraceString : public PrettyStackTraceEntry {
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53 const char *Str;
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54 public:
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55 PrettyStackTraceString(const char *str) : Str(str) {}
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56 void print(raw_ostream &OS) const override;
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57 };
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58
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59 /// PrettyStackTraceFormat - This object prints a string (which may use
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60 /// printf-style formatting but should not contain newlines) to the stream
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61 /// as the stack trace when a crash occurs.
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62 class PrettyStackTraceFormat : public PrettyStackTraceEntry {
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63 llvm::SmallVector<char, 32> Str;
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64 public:
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65 PrettyStackTraceFormat(const char *Format, ...);
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66 void print(raw_ostream &OS) const override;
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67 };
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68
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69 /// PrettyStackTraceProgram - This object prints a specified program arguments
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70 /// to the stream as the stack trace when a crash occurs.
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71 class PrettyStackTraceProgram : public PrettyStackTraceEntry {
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72 int ArgC;
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73 const char *const *ArgV;
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74 public:
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75 PrettyStackTraceProgram(int argc, const char * const*argv)
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76 : ArgC(argc), ArgV(argv) {
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77 EnablePrettyStackTrace();
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78 }
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79 void print(raw_ostream &OS) const override;
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80 };
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81
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82 /// Returns the topmost element of the "pretty" stack state.
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83 const void *SavePrettyStackState();
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84
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85 /// Restores the topmost element of the "pretty" stack state to State, which
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86 /// should come from a previous call to SavePrettyStackState(). This is
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87 /// useful when using a CrashRecoveryContext in code that also uses
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88 /// PrettyStackTraceEntries, to make sure the stack that's printed if a crash
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89 /// happens after a crash that's been recovered by CrashRecoveryContext
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90 /// doesn't have frames on it that were added in code unwound by the
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91 /// CrashRecoveryContext.
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92 void RestorePrettyStackState(const void *State);
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93
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94 } // end namespace llvm
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96 #endif