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annotate lib/Support/Debug.cpp @ 21:fc4a6333556f

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change error message when tail call elimination is failed.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 14 Oct 2013 19:09:00 +0900
parents 9ad51c7bc036
children 54457678186b
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1 //===-- Debug.cpp - An easy way to add debug output to your code ----------===//
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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 implements a handy way of adding debugging information to your
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11 // code, without it being enabled all of the time, and without having to add
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12 // command line options to enable it.
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13 //
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14 // In particular, just wrap your code with the DEBUG() macro, and it will be
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15 // enabled automatically if you specify '-debug' on the command-line.
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16 // Alternatively, you can also use the SET_DEBUG_TYPE("foo") macro to specify
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17 // that your debug code belongs to class "foo". Then, on the command line, you
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18 // can specify '-debug-only=foo' to enable JUST the debug information for the
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19 // foo class.
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20 //
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21 // When compiling without assertions, the -debug-* options and all code in
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22 // DEBUG() statements disappears, so it does not affect the runtime of the code.
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23 //
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24 //===----------------------------------------------------------------------===//
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25
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26 #include "llvm/Support/Debug.h"
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27 #include "llvm/Support/CommandLine.h"
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28 #include "llvm/Support/Signals.h"
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29 #include "llvm/Support/circular_raw_ostream.h"
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30
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31 using namespace llvm;
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32
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33 // All Debug.h functionality is a no-op in NDEBUG mode.
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34 #ifndef NDEBUG
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35 bool llvm::DebugFlag; // DebugFlag - Exported boolean set by the -debug option
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36
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37 // -debug - Command line option to enable the DEBUG statements in the passes.
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38 // This flag may only be enabled in debug builds.
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39 static cl::opt<bool, true>
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40 Debug("debug", cl::desc("Enable debug output"), cl::Hidden,
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41 cl::location(DebugFlag));
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42
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43 // -debug-buffer-size - Buffer the last N characters of debug output
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44 //until program termination.
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45 static cl::opt<unsigned>
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46 DebugBufferSize("debug-buffer-size",
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47 cl::desc("Buffer the last N characters of debug output "
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48 "until program termination. "
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49 "[default 0 -- immediate print-out]"),
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50 cl::Hidden,
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51 cl::init(0));
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52
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53 static std::string CurrentDebugType;
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54
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55 namespace {
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56
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57 struct DebugOnlyOpt {
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58 void operator=(const std::string &Val) const {
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59 DebugFlag |= !Val.empty();
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60 CurrentDebugType = Val;
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61 }
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62 };
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63
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64 }
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65
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66 static DebugOnlyOpt DebugOnlyOptLoc;
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67
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68 static cl::opt<DebugOnlyOpt, true, cl::parser<std::string> >
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69 DebugOnly("debug-only", cl::desc("Enable a specific type of debug output"),
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70 cl::Hidden, cl::value_desc("debug string"),
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71 cl::location(DebugOnlyOptLoc), cl::ValueRequired);
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72
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73 // Signal handlers - dump debug output on termination.
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74 static void debug_user_sig_handler(void *Cookie) {
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75 // This is a bit sneaky. Since this is under #ifndef NDEBUG, we
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76 // know that debug mode is enabled and dbgs() really is a
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77 // circular_raw_ostream. If NDEBUG is defined, then dbgs() ==
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78 // errs() but this will never be invoked.
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79 llvm::circular_raw_ostream *dbgout =
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80 static_cast<llvm::circular_raw_ostream *>(&llvm::dbgs());
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81 dbgout->flushBufferWithBanner();
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82 }
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83
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84 // isCurrentDebugType - Return true if the specified string is the debug type
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85 // specified on the command line, or if none was specified on the command line
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86 // with the -debug-only=X option.
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87 //
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88 bool llvm::isCurrentDebugType(const char *DebugType) {
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89 return CurrentDebugType.empty() || DebugType == CurrentDebugType;
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90 }
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91
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92 /// setCurrentDebugType - Set the current debug type, as if the -debug-only=X
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93 /// option were specified. Note that DebugFlag also needs to be set to true for
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94 /// debug output to be produced.
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95 ///
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96 void llvm::setCurrentDebugType(const char *Type) {
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97 CurrentDebugType = Type;
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98 }
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99
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100 /// dbgs - Return a circular-buffered debug stream.
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101 raw_ostream &llvm::dbgs() {
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102 // Do one-time initialization in a thread-safe way.
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103 static struct dbgstream {
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104 circular_raw_ostream strm;
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105
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106 dbgstream() :
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107 strm(errs(), "*** Debug Log Output ***\n",
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108 (!EnableDebugBuffering || !DebugFlag) ? 0 : DebugBufferSize) {
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109 if (EnableDebugBuffering && DebugFlag && DebugBufferSize != 0)
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110 // TODO: Add a handler for SIGUSER1-type signals so the user can
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111 // force a debug dump.
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112 sys::AddSignalHandler(&debug_user_sig_handler, 0);
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113 // Otherwise we've already set the debug stream buffer size to
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114 // zero, disabling buffering so it will output directly to errs().
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115 }
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116 } thestrm;
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117
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118 return thestrm.strm;
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119 }
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120
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121 #else
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122 // Avoid "has no symbols" warning.
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123 namespace llvm {
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124 /// dbgs - Return errs().
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125 raw_ostream &dbgs() {
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126 return errs();
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127 }
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128 }
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129
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130 #endif
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131
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132 /// EnableDebugBuffering - Turn on signal handler installation.
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133 ///
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134 bool llvm::EnableDebugBuffering = false;