Add +RTS -vg flag for requesting some GC trace messages, outside DEBUG
[ghc.git] / rts / Trace.h
1 /* -----------------------------------------------------------------------------
2 *
3 * (c) The GHC Team 2006
4 *
5 * Debug and performance tracing.
6 *
7 * This is a layer over RtsMessages, which provides for generating
8 * trace messages with timestamps and thread Ids attached
9 * automatically. Also, multiple classes of messages are supported,
10 * which can be enabled separately via RTS flags.
11 *
12 * All debug trace messages go through here. Additionally, we
13 * generate timestamped trace messages for consumption by profiling
14 * tools using this API.
15 *
16 * ---------------------------------------------------------------------------*/
17
18 #ifndef TRACE_H
19 #define TRACE_H
20
21 // -----------------------------------------------------------------------------
22 // Tracing functions
23 // -----------------------------------------------------------------------------
24
25 void initTracing (void);
26
27 // The simple way:
28 void trace (StgWord32 class, const char *str, ...)
29 GNUC3_ATTRIBUTE(format (printf, 2, 3));
30
31 // The harder way: sometimes we want to generate a trace message that
32 // consists of multiple components generated by different functions.
33 // So we provide the functionality of trace() split into 3 parts:
34 // - traceClass(): a check that the required class is enabled
35 // - traceBegin(): print the beginning of the trace message
36 // - traceEnd(): complete the trace message (release the lock too).
37 //
38 INLINE_HEADER rtsBool traceClass (StgWord32 class);
39
40 void traceBegin (const char *str, ...)
41 GNUC3_ATTRIBUTE(format (printf, 1, 2));
42
43 void traceEnd (void);
44
45 #ifdef DEBUG
46 #define debugTrace(class, str, ...) trace(class,str, ## __VA_ARGS__)
47 // variable arg macros are C99, and supported by gcc.
48 #define debugTraceBegin(str, ...) traceBegin(str, ## __VA_ARGS__)
49 #define debugTraceEnd() traceEnd()
50 #else
51 #define debugTrace(class, str, ...) /* nothing */
52 #define debugTraceBegin(str, ...) /* nothing */
53 #define debugTraceEnd() /* nothing */
54 #endif
55
56
57 // -----------------------------------------------------------------------------
58 // Message classes, these may be OR-ed together
59 // -----------------------------------------------------------------------------
60
61 // debugging flags, set with +RTS -D<something>
62 #define DEBUG_sched (1<<0)
63 #define DEBUG_interp (1<<1)
64 #define DEBUG_weak (1<<2)
65 #define DEBUG_gccafs (1<<3)
66 #define DEBUG_gc (1<<4)
67 #define DEBUG_block_alloc (1<<5)
68 #define DEBUG_sanity (1<<6)
69 #define DEBUG_stable (1<<7)
70 #define DEBUG_stm (1<<8)
71 #define DEBUG_prof (1<<9)
72 #define DEBUG_gran (1<<10)
73 #define DEBUG_par (1<<11)
74 #define DEBUG_linker (1<<12)
75 #define DEBUG_squeeze (1<<13)
76 #define DEBUG_hpc (1<<14)
77
78 // Tracing flags
79 #define TRACE_sched (1<<20)
80 #define TRACE_gc (1<<21)
81
82 // -----------------------------------------------------------------------------
83 // PRIVATE below here
84 // -----------------------------------------------------------------------------
85
86 extern StgWord32 classes_enabled;
87
88 INLINE_HEADER rtsBool
89 traceClass (StgWord32 class) { return (classes_enabled & class); }
90
91 // -----------------------------------------------------------------------------
92
93 #endif /* TRACE_H */