2 * Copyright 2014 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef FOLLY_EXPERIMENTAL_SYMBOLIZER_SYMBOLIZER_H_
18 #define FOLLY_EXPERIMENTAL_SYMBOLIZER_SYMBOLIZER_H_
22 #include <unordered_map>
24 #include "folly/FBString.h"
25 #include "folly/Range.h"
26 #include "folly/String.h"
27 #include "folly/experimental/symbolizer/Elf.h"
28 #include "folly/experimental/symbolizer/ElfCache.h"
29 #include "folly/experimental/symbolizer/Dwarf.h"
30 #include "folly/experimental/symbolizer/StackTrace.h"
33 namespace symbolizer {
36 * Frame information: symbol name and location.
38 * Note that both name and location are references in the Symbolizer object,
39 * which must outlive this SymbolizedFrame object.
41 struct SymbolizedFrame {
42 SymbolizedFrame() : found(false) { }
46 Dwarf::LocationInfo location;
49 * Demangle the name and return it. Not async-signal-safe; allocates memory.
51 fbstring demangledName() const {
52 return demangle(name.fbstr().c_str());
58 FrameArray() : frameCount(0) { }
61 uintptr_t addresses[N];
62 SymbolizedFrame frames[N];
66 * Get stack trace into a given FrameArray, return true on success (and
67 * set frameCount to the actual frame count, which may be > N) and false
72 bool fixFrameArray(FrameArray<N>& fa, ssize_t n) {
75 for (size_t i = 0; i < fa.frameCount; ++i) {
76 fa.frames[i].found = false;
86 // Always inline these functions; they don't do much, and unittests rely
87 // on them never showing up in a stack trace.
89 inline bool getStackTrace(FrameArray<N>& fa) __attribute__((always_inline));
92 inline bool getStackTrace(FrameArray<N>& fa) {
93 return detail::fixFrameArray(fa, getStackTrace(fa.addresses, N));
96 inline bool getStackTraceSafe(FrameArray<N>& fa) __attribute__((always_inline));
99 inline bool getStackTraceSafe(FrameArray<N>& fa) {
100 return detail::fixFrameArray(fa, getStackTraceSafe(fa.addresses, N));
105 explicit Symbolizer(ElfCacheBase* cache = nullptr);
108 * Symbolize given addresses.
110 void symbolize(const uintptr_t* addresses,
111 SymbolizedFrame* frames,
115 void symbolize(FrameArray<N>& fa) {
116 symbolize(fa.addresses, fa.frames, fa.frameCount);
120 * Shortcut to symbolize one address.
122 bool symbolize(uintptr_t address, SymbolizedFrame& frame) {
123 symbolize(&address, &frame, 1);
128 ElfCacheBase* cache_;
132 * Format one address in the way it's usually printer by SymbolizePrinter.
135 class AddressFormatter {
140 * Format the address. Returns an internal buffer.
142 StringPiece format(uintptr_t address);
145 static constexpr char bufTemplate[] = " @ 0000000000000000";
146 char buf_[sizeof(bufTemplate)];
150 * Print a list of symbolized addresses. Base class.
152 class SymbolizePrinter {
155 * Print one address, no ending newline.
157 void print(uintptr_t address, const SymbolizedFrame& frame);
160 * Print one address with ending newline.
162 void println(uintptr_t address, const SymbolizedFrame& frame);
165 * Print multiple addresses on separate lines.
167 void println(const uintptr_t* addresses,
168 const SymbolizedFrame* frames,
172 * Print multiple addresses on separate lines, skipping the first
176 void println(const FrameArray<N>& fa, size_t skip=0) {
177 if (skip < fa.frameCount) {
178 println(fa.addresses + skip, fa.frames + skip, fa.frameCount - skip);
182 virtual ~SymbolizePrinter() { }
185 // Skip file and line information
186 NO_FILE_AND_LINE = 1 << 0,
188 // As terse as it gets: function name if found, address otherwise
191 // Always colorize output (ANSI escape code)
194 // Colorize output only if output is printed to a TTY (ANSI escape code)
195 COLOR_IF_TTY = 1 << 3,
198 enum Color { DEFAULT, RED, GREEN, YELLOW, BLUE, CYAN, WHITE, PURPLE };
202 explicit SymbolizePrinter(int options, bool isTty = false)
211 void printTerse(uintptr_t address, const SymbolizedFrame& frame);
212 virtual void doPrint(StringPiece sp) = 0;
216 * Print a list of symbolized addresses to a stream.
217 * Not reentrant. Do not use from signal handling code.
219 class OStreamSymbolizePrinter : public SymbolizePrinter {
221 explicit OStreamSymbolizePrinter(std::ostream& out, int options=0);
223 void doPrint(StringPiece sp) override;
228 * Print a list of symbolized addresses to a file descriptor.
229 * Ignores errors. Async-signal-safe.
231 class FDSymbolizePrinter : public SymbolizePrinter {
233 explicit FDSymbolizePrinter(int fd, int options=0);
235 void doPrint(StringPiece sp) override;
240 * Print a list of symbolized addresses to a FILE*.
241 * Ignores errors. Not reentrant. Do not use from signal handling code.
243 class FILESymbolizePrinter : public SymbolizePrinter {
245 explicit FILESymbolizePrinter(FILE* file, int options=0);
247 void doPrint(StringPiece sp) override;
252 * Print a list of symbolized addresses to a std::string.
253 * Not reentrant. Do not use from signal handling code.
255 class StringSymbolizePrinter : public SymbolizePrinter {
257 explicit StringSymbolizePrinter(int options=0) : SymbolizePrinter(options) { }
259 std::string str() const { return buf_.toStdString(); }
260 const fbstring& fbstr() const { return buf_; }
261 fbstring moveFbString() { return std::move(buf_); }
264 void doPrint(StringPiece sp) override;
268 } // namespace symbolizer
271 #endif /* FOLLY_EXPERIMENTAL_SYMBOLIZER_SYMBOLIZER_H_ */