1 //===- debug.cpp ----------------------------------------------------------===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of the ORC runtime support library.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "debug.h"
14 
15 #include <cassert>
16 #include <cstdarg>
17 #include <cstdio>
18 #include <cstdlib>
19 #include <cstring>
20 
21 
22 namespace __orc_rt {
23 
24 #ifndef NDEBUG
25 
26 std::atomic<const char *> DebugTypes;
27 char DebugTypesAll;
28 char DebugTypesNone;
29 
30 /// Sets the DebugState and DebugTypes values -- this function may be called
31 /// concurrently on multiple threads, but will always assign the same values so
32 /// this should be safe.
33 const char *initializeDebug() {
34   if (const char *DT = getenv("ORC_RT_DEBUG")) {
35     // If ORC_RT_DEBUG=1 then log everything.
36     if (strcmp(DT, "1") == 0) {
37       DebugTypes.store(&DebugTypesAll, std::memory_order_relaxed);
38       return &DebugTypesAll;
39     }
40 
41     // If ORC_RT_DEBUG is non-empty then record the string for use in
42     // debugTypeEnabled.
43     if (strcmp(DT, "") != 0) {
44       DebugTypes.store(DT, std::memory_order_relaxed);
45       return DT;
46     }
47   }
48 
49   // If ORT_RT_DEBUG is undefined or defined as empty then log nothing.
50   DebugTypes.store(&DebugTypesNone, std::memory_order_relaxed);
51   return &DebugTypesNone;
52 }
53 
54 bool debugTypeEnabled(const char *Type, const char *Types) {
55   assert(Types && Types != &DebugTypesAll && Types != &DebugTypesNone &&
56          "Invalid Types value");
57   size_t TypeLen = strlen(Type);
58   const char *Start = Types;
59   const char *End = Start;
60 
61   do {
62     if (*End == '\0' || *End == ',') {
63       size_t ItemLen = End - Start;
64       if (ItemLen == TypeLen && memcmp(Type, Start, TypeLen) == 0)
65         return true;
66       if (*End == '\0')
67         return false;
68       Start = End + 1;
69     }
70     ++End;
71   } while (true);
72 }
73 
74 void printdbg(const char *format, ...) {
75   va_list Args;
76   va_start(Args, format);
77   vfprintf(stderr, format, Args);
78   va_end(Args);
79 }
80 
81 #endif // !NDEBUG
82 
83 } // end namespace __orc_rt
84