Currently, if a predicate is hard to match on the Rust side, a sizable
query against a very large file can take forever, and ends up hanging.
This commit adds an API function `ts_query_cursor_set_timeout_micros` to
limit how long query execution is allowed to take, thereby negating the
chance of a hang to occur.
* In WASM, use a custom, simple malloc implementation that lets us
expicitly reset the heap with a new start location.
* When a WASM call traps or errors, propagate that as a parse failure.
* Reset the WASM heap after every parse.
Co-authored-by: Conrad <conrad@zed.dev>
Replace non-mutating `ts_parser_wasm_store` function with
`ts_parser_take_wasm_store`, which removes and returns the wasm
store, in order to facilitate single ownership.
DISCUSSION:
When compiling with `-Os` for "smallest, fastest", an error is reported in `parser.c`:
```
/Users/siegel/git/tree-sitter/lib/src/./parser.c:1368:10: error: unused variable 'did_merge' [-Werror,-Wunused-variable]
bool did_merge = ts_stack_merge(self->stack, version, previous_version_count);
^
1 error generated.
```
This is because with `NDEBUG` set, `assert(e)` collapses to `(void)0`,
which in turn means that `did_merge` does not actually get consumed.
This seems to get caught when compiling with `-Os`, but not otherwise.
Compiler version:
```
Apple clang version 13.0.0 (clang-1300.0.29.30)
Target: arm64-apple-darwin21.3.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
```
Fixes
```
warning: In file included from src\lib.c:12:
warning: src/./parser.c:1781:28: warning: 'fdopen' is deprecated: The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _fdopen. See online help for details. [-Wdeprecated-declarations]
warning: self->dot_graph_file = fdopen(fd, "a");
warning: ^
warning: C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\ucrt\stdio.h:2431:28: note: 'fdopen' has been explicitly marked deprecated here
warning: _Check_return_ _CRT_NONSTDC_DEPRECATE(_fdopen) _ACRTIMP FILE* __cdecl fdopen(_In_ int _FileHandle, _In_z_ char const* _Format);
warning: ^
warning: C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\ucrt\corecrt.h:414:50: note: expanded from macro '_CRT_NONSTDC_DEPRECATE'
warning: #define _CRT_NONSTDC_DEPRECATE(_NewName) _CRT_DEPRECATE_TEXT( \
warning: ^
warning: C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\VC\Tools\MSVC\14.29.30133\include\vcruntime.h:310:47: note: expanded from macro '_CRT_DEPRECATE_TEXT'
warning: #define _CRT_DEPRECATE_TEXT(_Text) __declspec(deprecated(_Text))
```
Also remove the use of bitfields from the parse table format.
In all cases, bitfields were not necessary to achieve the
current binary sizes. Avoiding them makes the binaries more
portable.
There was no way to make this change backward-compatible,
so we have finally dropped support for parsers generated
with an earlier version of Tree-sitter.
At some point, when Atom adopts this version of Tree-sitter,
this change will affect Atom users who have installed packages
using third-party Tree-sitter parsers. The packages will need
to be updated to use a regenerated version of the parsers.
