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comparison libsanitizer/sanitizer_common/sanitizer_symbolizer_mac.cpp @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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131:84e7813d76e9 145:1830386684a0
1 //===-- sanitizer_symbolizer_mac.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 shared between various sanitizers' runtime libraries.
10 //
11 // Implementation of Mac-specific "atos" symbolizer.
12 //===----------------------------------------------------------------------===//
13
14 #include "sanitizer_platform.h"
15 #if SANITIZER_MAC
16
17 #include "sanitizer_allocator_internal.h"
18 #include "sanitizer_mac.h"
19 #include "sanitizer_symbolizer_mac.h"
20
21 #include <dlfcn.h>
22 #include <errno.h>
23 #include <stdlib.h>
24 #include <sys/wait.h>
25 #include <unistd.h>
26 #include <util.h>
27
28 namespace __sanitizer {
29
30 bool DlAddrSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
31 Dl_info info;
32 int result = dladdr((const void *)addr, &info);
33 if (!result) return false;
34 const char *demangled = DemangleSwiftAndCXX(info.dli_sname);
35 if (!demangled) return false;
36 stack->info.function = internal_strdup(demangled);
37 return true;
38 }
39
40 bool DlAddrSymbolizer::SymbolizeData(uptr addr, DataInfo *datainfo) {
41 Dl_info info;
42 int result = dladdr((const void *)addr, &info);
43 if (!result) return false;
44 const char *demangled = DemangleSwiftAndCXX(info.dli_sname);
45 datainfo->name = internal_strdup(demangled);
46 datainfo->start = (uptr)info.dli_saddr;
47 return true;
48 }
49
50 class AtosSymbolizerProcess : public SymbolizerProcess {
51 public:
52 explicit AtosSymbolizerProcess(const char *path, pid_t parent_pid)
53 : SymbolizerProcess(path, /*use_posix_spawn*/ true) {
54 // Put the string command line argument in the object so that it outlives
55 // the call to GetArgV.
56 internal_snprintf(pid_str_, sizeof(pid_str_), "%d", parent_pid);
57 }
58
59 private:
60 bool StartSymbolizerSubprocess() override {
61 // Configure sandbox before starting atos process.
62 return SymbolizerProcess::StartSymbolizerSubprocess();
63 }
64
65 bool ReachedEndOfOutput(const char *buffer, uptr length) const override {
66 return (length >= 1 && buffer[length - 1] == '\n');
67 }
68
69 void GetArgV(const char *path_to_binary,
70 const char *(&argv)[kArgVMax]) const override {
71 int i = 0;
72 argv[i++] = path_to_binary;
73 argv[i++] = "-p";
74 argv[i++] = &pid_str_[0];
75 if (GetMacosVersion() == MACOS_VERSION_MAVERICKS) {
76 // On Mavericks atos prints a deprecation warning which we suppress by
77 // passing -d. The warning isn't present on other OSX versions, even the
78 // newer ones.
79 argv[i++] = "-d";
80 }
81 argv[i++] = nullptr;
82 }
83
84 char pid_str_[16];
85 };
86
87 static bool ParseCommandOutput(const char *str, uptr addr, char **out_name,
88 char **out_module, char **out_file, uptr *line,
89 uptr *start_address) {
90 // Trim ending newlines.
91 char *trim;
92 ExtractTokenUpToDelimiter(str, "\n", &trim);
93
94 // The line from `atos` is in one of these formats:
95 // myfunction (in library.dylib) (sourcefile.c:17)
96 // myfunction (in library.dylib) + 0x1fe
97 // myfunction (in library.dylib) + 15
98 // 0xdeadbeef (in library.dylib) + 0x1fe
99 // 0xdeadbeef (in library.dylib) + 15
100 // 0xdeadbeef (in library.dylib)
101 // 0xdeadbeef
102
103 const char *rest = trim;
104 char *symbol_name;
105 rest = ExtractTokenUpToDelimiter(rest, " (in ", &symbol_name);
106 if (rest[0] == '\0') {
107 InternalFree(symbol_name);
108 InternalFree(trim);
109 return false;
110 }
111
112 if (internal_strncmp(symbol_name, "0x", 2) != 0)
113 *out_name = symbol_name;
114 else
115 InternalFree(symbol_name);
116 rest = ExtractTokenUpToDelimiter(rest, ") ", out_module);
117
118 if (rest[0] == '(') {
119 if (out_file) {
120 rest++;
121 rest = ExtractTokenUpToDelimiter(rest, ":", out_file);
122 char *extracted_line_number;
123 rest = ExtractTokenUpToDelimiter(rest, ")", &extracted_line_number);
124 if (line) *line = (uptr)internal_atoll(extracted_line_number);
125 InternalFree(extracted_line_number);
126 }
127 } else if (rest[0] == '+') {
128 rest += 2;
129 uptr offset = internal_atoll(rest);
130 if (start_address) *start_address = addr - offset;
131 }
132
133 InternalFree(trim);
134 return true;
135 }
136
137 AtosSymbolizer::AtosSymbolizer(const char *path, LowLevelAllocator *allocator)
138 : process_(new(*allocator) AtosSymbolizerProcess(path, getpid())) {}
139
140 bool AtosSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
141 if (!process_) return false;
142 if (addr == 0) return false;
143 char command[32];
144 internal_snprintf(command, sizeof(command), "0x%zx\n", addr);
145 const char *buf = process_->SendCommand(command);
146 if (!buf) return false;
147 uptr line;
148 if (!ParseCommandOutput(buf, addr, &stack->info.function, &stack->info.module,
149 &stack->info.file, &line, nullptr)) {
150 process_ = nullptr;
151 return false;
152 }
153 stack->info.line = (int)line;
154 return true;
155 }
156
157 bool AtosSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
158 if (!process_) return false;
159 char command[32];
160 internal_snprintf(command, sizeof(command), "0x%zx\n", addr);
161 const char *buf = process_->SendCommand(command);
162 if (!buf) return false;
163 if (!ParseCommandOutput(buf, addr, &info->name, &info->module, nullptr,
164 nullptr, &info->start)) {
165 process_ = nullptr;
166 return false;
167 }
168 return true;
169 }
170
171 } // namespace __sanitizer
172
173 #endif // SANITIZER_MAC