CLog.h revision 651f13cea278ec967336033dd032faef0e9fc2ec
1//===- CLog.h - Logging Interface -------------------------------*- 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#ifndef LLVM_LIBCLANG_CLOG_H 11#define LLVM_LIBCLANG_CLOG_H 12 13#include "clang-c/Index.h" 14#include "clang/Basic/LLVM.h" 15#include "llvm/ADT/IntrusiveRefCntPtr.h" 16#include "llvm/ADT/SmallString.h" 17#include "llvm/ADT/StringRef.h" 18#include "llvm/Support/Compiler.h" 19#include "llvm/Support/raw_ostream.h" 20#include <string> 21 22namespace llvm { 23class format_object_base; 24} 25 26namespace clang { 27 class FileEntry; 28 29namespace cxindex { 30 31class Logger; 32typedef IntrusiveRefCntPtr<Logger> LogRef; 33 34/// \brief Collects logging output and writes it to stderr when it's destructed. 35/// Common use case: 36/// \code 37/// if (LogRef Log = Logger::make(__func__)) { 38/// *Log << "stuff"; 39/// } 40/// \endcode 41class Logger : public RefCountedBase<Logger> { 42 std::string Name; 43 bool Trace; 44 SmallString<64> Msg; 45 llvm::raw_svector_ostream LogOS; 46public: 47 static const char *getEnvVar() { 48 static const char *sCachedVar = ::getenv("LIBCLANG_LOGGING"); 49 return sCachedVar; 50 } 51 static bool isLoggingEnabled() { return getEnvVar() != 0; } 52 static bool isStackTracingEnabled() { 53 if (const char *EnvOpt = Logger::getEnvVar()) 54 return llvm::StringRef(EnvOpt) == "2"; 55 return false; 56 } 57 static LogRef make(llvm::StringRef name, 58 bool trace = isStackTracingEnabled()) { 59 if (isLoggingEnabled()) 60 return new Logger(name, trace); 61 return 0; 62 } 63 64 explicit Logger(llvm::StringRef name, bool trace) 65 : Name(name), Trace(trace), LogOS(Msg) { } 66 ~Logger(); 67 68 Logger &operator<<(CXTranslationUnit); 69 Logger &operator<<(const FileEntry *FE); 70 Logger &operator<<(CXCursor cursor); 71 Logger &operator<<(CXSourceLocation); 72 Logger &operator<<(CXSourceRange); 73 Logger &operator<<(CXString); 74 Logger &operator<<(llvm::StringRef Str) { LogOS << Str; return *this; } 75 Logger &operator<<(const char *Str) { 76 if (Str) 77 LogOS << Str; 78 return *this; 79 } 80 Logger &operator<<(unsigned long N) { LogOS << N; return *this; } 81 Logger &operator<<(long N) { LogOS << N ; return *this; } 82 Logger &operator<<(unsigned int N) { LogOS << N; return *this; } 83 Logger &operator<<(int N) { LogOS << N; return *this; } 84 Logger &operator<<(char C) { LogOS << C; return *this; } 85 Logger &operator<<(unsigned char C) { LogOS << C; return *this; } 86 Logger &operator<<(signed char C) { LogOS << C; return *this; } 87 Logger &operator<<(const llvm::format_object_base &Fmt); 88}; 89 90} 91} 92 93/// \brief Macros to automate common uses of Logger. Like this: 94/// \code 95/// LOG_FUNC_SECTION { 96/// *Log << "blah"; 97/// } 98/// \endcode 99#define LOG_SECTION(NAME) \ 100 if (clang::cxindex::LogRef Log = clang::cxindex::Logger::make(NAME)) 101#define LOG_FUNC_SECTION LOG_SECTION(LLVM_FUNCTION_NAME) 102 103#endif 104