1 // Copyright 2023 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef JNI_ZERO_LOGGING_H_
6 #define JNI_ZERO_LOGGING_H_
7
8 #include "third_party/jni_zero/jni_export.h"
9
10 #if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
11 #define JNI_ZERO_DCHECK_IS_ON() false
12 #else
13 #define JNI_ZERO_DCHECK_IS_ON() true
14 #endif
15
16 // Simplified version of Google's logging. Adapted from perfetto's
17 // implementation.
18 namespace jni_zero {
19
20 // Constexpr functions to extract basename(__FILE__), e.g.: ../foo/f.c -> f.c .
StrEnd(const char * s)21 constexpr const char* StrEnd(const char* s) {
22 return *s ? StrEnd(s + 1) : s;
23 }
24
BasenameRecursive(const char * s,const char * begin,const char * end)25 constexpr const char* BasenameRecursive(const char* s,
26 const char* begin,
27 const char* end) {
28 return (*s == '/' && s < end)
29 ? (s + 1)
30 : ((s > begin) ? BasenameRecursive(s - 1, begin, end) : s);
31 }
32
Basename(const char * str)33 constexpr const char* Basename(const char* str) {
34 return BasenameRecursive(StrEnd(str), str, StrEnd(str));
35 }
36
37 enum LogLev { kLogInfo = 0, kLogError, kLogFatal };
38
39 struct LogMessageCallbackArgs {
40 LogLev level;
41 int line;
42 const char* filename;
43 const char* message;
44 };
45
46 using LogMessageCallback = void (*)(LogMessageCallbackArgs);
47
48 // This is not thread safe and must be called before using tracing from other
49 // threads.
50 JNI_ZERO_COMPONENT_BUILD_EXPORT void SetLogMessageCallback(
51 LogMessageCallback callback);
52
53 JNI_ZERO_COMPONENT_BUILD_EXPORT void LogMessage(LogLev,
54 const char* fname,
55 int line,
56 const char* fmt,
57 ...)
58 __attribute__((__format__(__printf__, 4, 5)));
59
60 #define JNI_ZERO_IMMEDIATE_CRASH() \
61 do { \
62 __builtin_trap(); \
63 __builtin_unreachable(); \
64 } while (0)
65 #define JNI_ZERO_XLOG(level, fmt, ...) \
66 ::jni_zero::LogMessage(level, ::jni_zero::Basename(__FILE__), __LINE__, fmt, \
67 ##__VA_ARGS__)
68 #define JNI_ZERO_ILOG(fmt, ...) \
69 JNI_ZERO_XLOG(::jni_zero::kLogInfo, fmt, ##__VA_ARGS__)
70 #define JNI_ZERO_ELOG(fmt, ...) \
71 JNI_ZERO_XLOG(::jni_zero::kLogError, fmt, ##__VA_ARGS__)
72 #define JNI_ZERO_FLOG(fmt, ...) \
73 JNI_ZERO_XLOG(::jni_zero::kLogFatal, fmt, ##__VA_ARGS__)
74
75 #define JNI_ZERO_CHECK(x) \
76 do { \
77 if (__builtin_expect(!(x), 0)) { \
78 JNI_ZERO_FLOG("%s", "JNI_ZERO_CHECK(" #x ")"); \
79 } \
80 } while (0)
81 #if JNI_ZERO_DCHECK_IS_ON()
82 #define JNI_ZERO_DCHECK(x) JNI_ZERO_CHECK(x)
83 #else
84 #define JNI_ZERO_DCHECK(x) \
85 do { \
86 } while (false && (x))
87 #endif
88 } // namespace jni_zero
89
90 #endif // JNI_ZERO_LOGGING_H_
91