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35136e1e9c
When loading Ruby source files, we can save the result of successful opens as open(2)/openat(2) are a fairly expensive syscalls. This also avoids a time-of-check-to-time-of-use (TOCTTOU) problem. This reduces open(2) syscalls during `require'; but should be most apparent when users have a small $LOAD_PATH. Users with large $LOAD_PATH will benefit less since there'll be more open(2) failures due to ENOENT. With `strace -c -e openat ruby -e exit' under Linux, this results in a ~14% reduction of openat(2) syscalls (glibc uses openat(2) to implement open(2)). % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 0.00 0.000000 0 296 110 openat 0.00 0.000000 0 254 110 openat Additionally, the introduction of `struct ruby_file_load_state' may make future optimizations more apparent. This change cannot benefit binary (.so) loading since the dlopen(3) API requires a filename and I'm not aware of an alternative that takes a pre-existing FD. In typical situations, Ruby source files outnumber the mount of .so files.
28 lines
1.2 KiB
C
28 lines
1.2 KiB
C
#ifndef INTERNAL_PARSE_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_PARSE_H
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/**
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @brief Internal header for the parser.
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*/
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#include "ruby/ruby.h" /* for VALUE */
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struct rb_iseq_struct; /* in vm_core.h */
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struct ruby_file_load_state; /* internal/file.h */
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/* parse.y */
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VALUE rb_parser_set_yydebug(VALUE, VALUE);
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void *rb_parser_load_file(VALUE parser, VALUE name);
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void *rb_parser_load_state(VALUE parser, VALUE name,
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struct ruby_file_load_state *);
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void rb_parser_keep_script_lines(VALUE vparser);
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void rb_parser_error_tolerant(VALUE vparser);
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void rb_parser_keep_tokens(VALUE vparser);
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RUBY_SYMBOL_EXPORT_BEGIN
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VALUE rb_parser_set_context(VALUE, const struct rb_iseq_struct *, int);
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RUBY_SYMBOL_EXPORT_END
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#endif /* INTERNAL_PARSE_H */
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