/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/include/llvm/Support/PrettyStackTrace.h
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1 | | //===- llvm/Support/PrettyStackTrace.h - Pretty Crash Handling --*- C++ -*-===// |
2 | | // |
3 | | // The LLVM Compiler Infrastructure |
4 | | // |
5 | | // This file is distributed under the University of Illinois Open Source |
6 | | // License. See LICENSE.TXT for details. |
7 | | // |
8 | | //===----------------------------------------------------------------------===// |
9 | | // |
10 | | // This file defines the PrettyStackTraceEntry class, which is used to make |
11 | | // crashes give more contextual information about what the program was doing |
12 | | // when it crashed. |
13 | | // |
14 | | //===----------------------------------------------------------------------===// |
15 | | |
16 | | #ifndef LLVM_SUPPORT_PRETTYSTACKTRACE_H |
17 | | #define LLVM_SUPPORT_PRETTYSTACKTRACE_H |
18 | | |
19 | | #include "llvm/ADT/SmallVector.h" |
20 | | #include "llvm/Support/Compiler.h" |
21 | | |
22 | | namespace llvm { |
23 | | class raw_ostream; |
24 | | |
25 | | void EnablePrettyStackTrace(); |
26 | | |
27 | | /// PrettyStackTraceEntry - This class is used to represent a frame of the |
28 | | /// "pretty" stack trace that is dumped when a program crashes. You can define |
29 | | /// subclasses of this and declare them on the program stack: when they are |
30 | | /// constructed and destructed, they will add their symbolic frames to a |
31 | | /// virtual stack trace. This gets dumped out if the program crashes. |
32 | | class PrettyStackTraceEntry { |
33 | | friend PrettyStackTraceEntry *ReverseStackTrace(PrettyStackTraceEntry *); |
34 | | |
35 | | PrettyStackTraceEntry *NextEntry; |
36 | | PrettyStackTraceEntry(const PrettyStackTraceEntry &) = delete; |
37 | | void operator=(const PrettyStackTraceEntry &) = delete; |
38 | | public: |
39 | | PrettyStackTraceEntry(); |
40 | | virtual ~PrettyStackTraceEntry(); |
41 | | |
42 | | /// print - Emit information about this stack frame to OS. |
43 | | virtual void print(raw_ostream &OS) const = 0; |
44 | | |
45 | | /// getNextEntry - Return the next entry in the list of frames. |
46 | 0 | const PrettyStackTraceEntry *getNextEntry() const { return NextEntry; } |
47 | | }; |
48 | | |
49 | | /// PrettyStackTraceString - This object prints a specified string (which |
50 | | /// should not contain newlines) to the stream as the stack trace when a crash |
51 | | /// occurs. |
52 | | class PrettyStackTraceString : public PrettyStackTraceEntry { |
53 | | const char *Str; |
54 | | public: |
55 | 466k | PrettyStackTraceString(const char *str) : Str(str) {} |
56 | | void print(raw_ostream &OS) const override; |
57 | | }; |
58 | | |
59 | | /// PrettyStackTraceFormat - This object prints a string (which may use |
60 | | /// printf-style formatting but should not contain newlines) to the stream |
61 | | /// as the stack trace when a crash occurs. |
62 | | class PrettyStackTraceFormat : public PrettyStackTraceEntry { |
63 | | llvm::SmallVector<char, 32> Str; |
64 | | public: |
65 | | PrettyStackTraceFormat(const char *Format, ...); |
66 | | void print(raw_ostream &OS) const override; |
67 | | }; |
68 | | |
69 | | /// PrettyStackTraceProgram - This object prints a specified program arguments |
70 | | /// to the stream as the stack trace when a crash occurs. |
71 | | class PrettyStackTraceProgram : public PrettyStackTraceEntry { |
72 | | int ArgC; |
73 | | const char *const *ArgV; |
74 | | public: |
75 | | PrettyStackTraceProgram(int argc, const char * const*argv) |
76 | 102k | : ArgC(argc), ArgV(argv) { |
77 | 102k | EnablePrettyStackTrace(); |
78 | 102k | } |
79 | | void print(raw_ostream &OS) const override; |
80 | | }; |
81 | | |
82 | | /// Returns the topmost element of the "pretty" stack state. |
83 | | const void *SavePrettyStackState(); |
84 | | |
85 | | /// Restores the topmost element of the "pretty" stack state to State, which |
86 | | /// should come from a previous call to SavePrettyStackState(). This is |
87 | | /// useful when using a CrashRecoveryContext in code that also uses |
88 | | /// PrettyStackTraceEntries, to make sure the stack that's printed if a crash |
89 | | /// happens after a crash that's been recovered by CrashRecoveryContext |
90 | | /// doesn't have frames on it that were added in code unwound by the |
91 | | /// CrashRecoveryContext. |
92 | | void RestorePrettyStackState(const void *State); |
93 | | |
94 | | } // end namespace llvm |
95 | | |
96 | | #endif |