зеркало из https://github.com/github/ruby.git
8655c2e690
* RUBY_DEBUG_LOG: Logging debug information mechanism
This feature provides a mechanism to store logging information
to a file, stderr or memory space with simple macros.
The following information will be stored.
* (1) __FILE__, __LINE__ in C
* (2) __FILE__, __LINE__ in Ruby
* (3) __func__ in C (message title)
* (4) given string with sprintf format
* (5) Thread number (if multiple threads are running)
This feature is enabled only USE_RUBY_DEBUG_LOG is enabled.
Release version should not enable it.
Running with the `RUBY_DEBUG_LOG` environment variable enables
this feature.
# logging into a file
RUBY_DEBUG_LOG=/path/to/file STDERR
# logging into STDERR
RUBY_DEBUG_LOG=stderr
# logging into memory space (check with a debugger)
# It will help if the timing is important.
RUBY_DEBUG_LOG=mem
RUBY_DEBUG_LOG_FILTER environment variable can specify the fileter string.
If "(3) __func__ in C (message title)" contains the specified string, the
infomation will be stored (example: RUBY_DEBUG_LOG_FILTER=str will enable
only on str related information).
In a MRI source code, you can use the following macros:
* RUBY_DEBUG_LOG(fmt, ...): Above (1) to (4) will be logged.
* RUBY_DEBUG_LOG2(file, line, fmt, ...):
Same as RUBY_DEBUG_LOG(), but (1) will be replaced with given file, line.
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