1 //===- CLog.h - Logging Interface -------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_LIBCLANG_CLOG_H
11 #define LLVM_LIBCLANG_CLOG_H
13 #include "llvm/ADT/StringRef.h"
14 #include "llvm/ADT/IntrusiveRefCntPtr.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/Support/raw_ostream.h"
20 class format_object_base;
28 typedef IntrusiveRefCntPtr<Logger> LogRef;
30 /// \brief Collects logging output and writes it to stderr when it's destructed.
33 /// if (LogRef Log = Logger::make(__func__)) {
37 class Logger : public RefCountedBase<Logger> {
40 llvm::SmallString<64> Msg;
41 llvm::raw_svector_ostream LogOS;
43 static const char *getEnvVar() {
44 static const char *sCachedVar = ::getenv("LIBCLANG_LOGGING");
47 static bool isLoggingEnabled() { return getEnvVar() != 0; }
48 static bool isStackTracingEnabled() {
49 if (const char *EnvOpt = Logger::getEnvVar())
50 return llvm::StringRef(EnvOpt) =="2";
53 static LogRef make(llvm::StringRef name,
54 bool trace = isStackTracingEnabled()) {
55 if (isLoggingEnabled())
56 return new Logger(name, trace);
60 explicit Logger(llvm::StringRef name, bool trace)
61 : Name(name), Trace(trace), LogOS(Msg) { }
64 Logger &operator<<(CXTranslationUnit);
65 Logger &operator<<(CXSourceLocation);
66 Logger &operator<<(CXSourceRange);
67 Logger &operator<<(CXString);
68 Logger &operator<<(llvm::StringRef Str) { LogOS << Str; return *this; }
69 Logger &operator<<(const char *Str) {
74 Logger &operator<<(unsigned long N) { LogOS << N; return *this; }
75 Logger &operator<<(long N) { LogOS << N ; return *this; }
76 Logger &operator<<(unsigned int N) { LogOS << N; return *this; }
77 Logger &operator<<(int N) { LogOS << N; return *this; }
78 Logger &operator<<(char C) { LogOS << C; return *this; }
79 Logger &operator<<(unsigned char C) { LogOS << C; return *this; }
80 Logger &operator<<(signed char C) { LogOS << C; return *this; }
81 Logger &operator<<(const llvm::format_object_base &Fmt);
87 /// \brief Macros to automate common uses of Logger. Like this:
89 /// LOG_FUNC_SECTION {
92 #define LOG_SECTION(NAME) if (LogRef Log = clang::cxindex::Logger::make(NAME))
93 #define LOG_FUNC_SECTION LOG_SECTION(__func__)