1 //===- CLog.h - Logging Interface -------------------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #ifndef LLVM_CLANG_TOOLS_LIBCLANG_CLOG_H
10 #define LLVM_CLANG_TOOLS_LIBCLANG_CLOG_H
12 #include "clang-c/Index.h"
13 #include "clang/Basic/LLVM.h"
14 #include "llvm/ADT/IntrusiveRefCntPtr.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/ADT/StringRef.h"
17 #include "llvm/Support/Compiler.h"
18 #include "llvm/Support/raw_ostream.h"
22 class format_object_base;
31 typedef IntrusiveRefCntPtr<Logger> LogRef;
33 /// Collects logging output and writes it to stderr when it's destructed.
36 /// if (LogRef Log = Logger::make(__func__)) {
40 class Logger : public RefCountedBase<Logger> {
44 llvm::raw_svector_ostream LogOS;
46 static const char *getEnvVar() {
47 static const char *sCachedVar = ::getenv("LIBCLANG_LOGGING");
50 static bool isLoggingEnabled() { return getEnvVar() != nullptr; }
51 static bool isStackTracingEnabled() {
52 if (const char *EnvOpt = Logger::getEnvVar())
53 return llvm::StringRef(EnvOpt) == "2";
56 static LogRef make(llvm::StringRef name,
57 bool trace = isStackTracingEnabled()) {
58 if (isLoggingEnabled())
59 return new Logger(name, trace);
63 explicit Logger(llvm::StringRef name, bool trace)
64 : Name(name), Trace(trace), LogOS(Msg) { }
67 Logger &operator<<(CXTranslationUnit);
68 Logger &operator<<(const FileEntry *FE);
69 Logger &operator<<(CXCursor cursor);
70 Logger &operator<<(CXSourceLocation);
71 Logger &operator<<(CXSourceRange);
72 Logger &operator<<(CXString);
73 Logger &operator<<(llvm::StringRef Str) { LogOS << Str; return *this; }
74 Logger &operator<<(const char *Str) {
79 Logger &operator<<(unsigned long N) { LogOS << N; return *this; }
80 Logger &operator<<(long N) { LogOS << N ; return *this; }
81 Logger &operator<<(unsigned int N) { LogOS << N; return *this; }
82 Logger &operator<<(int N) { LogOS << N; return *this; }
83 Logger &operator<<(char C) { LogOS << C; return *this; }
84 Logger &operator<<(unsigned char C) { LogOS << C; return *this; }
85 Logger &operator<<(signed char C) { LogOS << C; return *this; }
86 Logger &operator<<(const llvm::format_object_base &Fmt);
92 /// Macros to automate common uses of Logger. Like this:
94 /// LOG_FUNC_SECTION {
98 #define LOG_SECTION(NAME) \
99 if (clang::cxindex::LogRef Log = clang::cxindex::Logger::make(NAME))
100 #define LOG_FUNC_SECTION LOG_SECTION(__func__)