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annotate mupdf-source/thirdparty/gumbo-parser/DEBUGGING.md @ 29:f76e6575dca9 v1.26.4+1

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+++++ v1.26.4+1
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 19:59:23 +0200
parents b50eed0cc0ef
children
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1 These are a couple of debugging notes that may be helpful for anyone developing
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2 Gumbo or trying to diagnose a tricky problem. They will probably not be
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3 necessary for normal clients of this library - Gumbo is relatively stable, and
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4 bugs are often rare and obscure. However, they're handy to have as a reference,
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5 and may also provide useful Google fodder to people searching for these tools.
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7 Standard disclaimer: I use all of these techniques on my Ubuntu 14.04 computer
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8 with gcc 4.8.2, clang 3.4, and gtest 1.6.0, but make no warranty about them
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9 working on other systems. In particular, they're almost certain not to work on
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10 Windows.
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12 Debug output
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13 ============
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15 Gumbo has a compile-time switch to dump lots of debug output onto stdout.
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16 Compile with the GUMBO_DEBUG define enabled:
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18 ```bash
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19 $ make CFLAGS='-DGUMBO_DEBUG'
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20 ```
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22 Note that this spits *a lot* of debug information to the console and makes the
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23 program run significantly slower, so it's usually helpful to isolate only the
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24 specific HTML file or fragment that causes the bug. It lets us trace the
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25 operation of each of the tokenizer & parser's state machines in depth, though.
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27 Unit tests
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28 ==========
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30 As mentioned in the README, Gumbo relies on [googletest][] for unit tests.
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31 Unzip the gtest ZIP distribution inside the Gumbo root and rename it 'gtest'.
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32 'make check' runs the tests, as normal.
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34 ```bash
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35 $ make check
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36 $ cat test-suite.log
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37 ```
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39 If you need to debug a core dump, you'll probably want to run the test binary
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40 directly:
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42 ```bash
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43 $ ulimit -c unlimited
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44 $ make check
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45 $ .libs/lt-gumbo_test
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46 $ gdb .libs/lt-gumbo_test core
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47 ```
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49 The same goes for core dumps in other example binaries.
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51 To run only a single unit test, pass the --gtest_filter='TestName' flag to the
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52 lt-gumbo_test binary.
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54 Assertions
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55 ==========
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57 Gumbo relies pretty heavily on assertions. By default they're enabled at
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58 run-time: to turn them off, define NDEBUG:
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60 ```bash
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61 $ make CFLAGS='-DNDEBUG'
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62 ```
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64 ASAN
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65 ====
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67 Google's [address-sanitizer][] is a helpful tool that lets you find memory
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68 errors with relatively low overhead: enough that you can often run it in
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69 production. Enabling it for C/C++ binaries is pretty standard and described on
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70 the ASAN documentation pages. It requires Clang >=3.1 or GCC >= 4.8.
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72 ```bash
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73 $ make \
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74 CFLAGS='-fsanitize=address -fno-omit-frame-pointer -fno-inline' \
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75 LDFLAGS='-fsanitize=address'
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76 ```
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78 ASAN can also be used when Gumbo is compiled as a shared library and linked into
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79 a scripting language via FFI, but this use-case is unsupported by the ASAN
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80 authors. To do it, use LD_PRELOAD to ensure the ASAN runtime support is
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81 included in the process:
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83 ```bash
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84 $ LD_PRELOAD=libasan.so.0 python -c 'import gumbo; gumbo.parse(problem_text)'
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85 ```
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87 Getting clean stack traces from this requires the use of the llvm-symbolizer
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88 binary, included with clang:
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90 ```bash
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91 $ export ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer-3.4
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92 $ export ASAN_OPTIONS=symbolize=1
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93 $ LD_PRELOAD=libasan.so.0 python -c \
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94 'import gumbo; gumbo.parse(problem_text)' 2>&1 | head -100
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95 $ killall llvm-symbolizer-3.4
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96 $ killall llvm-symbolizer-3.4
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97 $ killall llvm-symbolizer-3.4
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98 ```
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diff changeset
100 This use case is even less officially supported than using it with dynamic
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
101 shared objects; on my machine, it led to a recursive ASAN error about a
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 use-after-free in llvm-symbolizer, effectively fork-bombing the machine. Have
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 the killalls ready, and avoid letting the process run for too long (eg. piping
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 it to 'less').
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 [googletest]: https://code.google.com/p/googletest/
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 [address-sanitizer]: https://code.google.com/p/address-sanitizer/