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026b62f264
Simplify the srcfile subsystem by making it official that any pointer passed to src_get() needs to have been obtained from the srcfile subsystem itself. Move a lot of the srcfile operations into inline code; often they amount to a single machine instruction... Signed-off-by: H. Peter Anvin <hpa@zytor.com>
103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 1996-2016 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* These functions are used to keep track of the source code file and name.
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*/
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#ifndef ASM_SRCFILE_H
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#define ASM_SRCFILE_H
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#include "compiler.h"
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struct src_location {
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const char *filename;
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int32_t lineno;
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};
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extern struct src_location _src_here;
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void src_init(void);
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void src_free(void);
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const char *src_set_fname(const char *newname);
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static inline const char *src_get_fname(void)
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{
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return _src_here.filename;
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}
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static inline int32_t src_set_linnum(int32_t newline)
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{
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int32_t oldline = _src_here.lineno;
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_src_here.lineno = newline;
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return oldline;
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}
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static inline int32_t src_get_linnum(void)
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{
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return _src_here.lineno;
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}
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/* Can be used when there is no need for the old information */
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void src_set(int32_t line, const char *filename);
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/*
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* src_get gets both the source file name and line.
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* It is also used if you maintain private status about the source location
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* It return 0 if the information was the same as the last time you
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* checked, -2 if the name changed and (new-old) if just the line changed.
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*
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* xname must point to a filename string previously returned from any
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* function of this subsystem or be NULL; another string value will
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* not work.
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*/
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static inline int32_t src_get(int32_t *xline, const char **xname)
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{
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const char *xn = *xname;
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int32_t xl = *xline;
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*xline = _src_here.lineno;
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*xname = _src_here.filename;
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/* The return value is expected to be optimized out almost everywhere */
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if (!xn || xn != _src_here.filename)
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return -2;
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else
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return _src_here.lineno - xl;
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}
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/*
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* Returns and sets/returns the current information as a structure.
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*/
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static inline struct src_location src_where(void)
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{
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return _src_here;
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}
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struct src_location src_update(struct src_location);
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#endif /* ASM_SRCFILE_H */
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