600 lines
22 KiB
C
600 lines
22 KiB
C
/* File format for coverage information
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Copyright (C) 1996, 1997, 1998, 2000, 2002,
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2003, 2004 Free Software Foundation, Inc.
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Contributed by Bob Manson <manson@cygnus.com>.
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Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/* Coverage information is held in two files. A notes file, which is
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generated by the compiler, and a data file, which is generated
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by the program under test. Both files use a similar structure. We
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do not attempt to make these files backwards compatible with
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previous versions, as you only need coverage information when
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developing a program. We do hold version information, so that
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mismatches can be detected, and we use a format that allows tools
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to skip information they do not understand or are not interested
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in.
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Numbers are recorded in the 32 bit unsigned binary form of the
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endianness of the machine generating the file. 64 bit numbers are
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stored as two 32 bit numbers, the low part first. Strings are
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padded with 1 to 4 NUL bytes, to bring the length up to a multiple
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of 4. The number of 4 bytes is stored, followed by the padded
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string. Zero length and NULL strings are simply stored as
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a length of zero (they have no trailing NUL or padding).
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int32: byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3
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int64: int32:low int32:high
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string: int32:0 | int32:length char* char:0 padding
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padding: | char:0 | char:0 char:0 | char:0 char:0 char:0
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item: int32 | int64 | string
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The basic format of the files is
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file : int32:magic int32:version int32:stamp record*
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The magic ident is different for the notes and the data files. The
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magic ident is used to determine the endianness of the file, when
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reading. The version is the same for both files and is derived
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from gcc's version number. The stamp value is used to synchronize
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note and data files and to synchronize merging within a data
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file. It need not be an absolute time stamp, merely a ticker that
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increments fast enough and cycles slow enough to distinguish
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different compile/run/compile cycles.
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Although the ident and version are formally 32 bit numbers, they
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are derived from 4 character ASCII strings. The version number
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consists of the single character major version number, a two
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character minor version number (leading zero for versions less than
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10), and a single character indicating the status of the release.
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That will be 'e' experimental, 'p' prerelease and 'r' for release.
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Because, by good fortune, these are in alphabetical order, string
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collating can be used to compare version strings. Be aware that
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the 'e' designation will (naturally) be unstable and might be
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incompatible with itself. For gcc 3.4 experimental, it would be
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'304e' (0x33303465). When the major version reaches 10, the
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letters A-Z will be used. Assuming minor increments releases every
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6 months, we have to make a major increment every 50 years.
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Assuming major increments releases every 5 years, we're ok for the
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next 155 years -- good enough for me.
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A record has a tag, length and variable amount of data.
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record: header data
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header: int32:tag int32:length
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data: item*
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Records are not nested, but there is a record hierarchy. Tag
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numbers reflect this hierarchy. Tags are unique across note and
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data files. Some record types have a varying amount of data. The
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LENGTH is the number of 4bytes that follow and is usually used to
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determine how much data. The tag value is split into 4 8-bit
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fields, one for each of four possible levels. The most significant
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is allocated first. Unused levels are zero. Active levels are
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odd-valued, so that the LSB of the level is one. A sub-level
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incorporates the values of its superlevels. This formatting allows
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you to determine the tag hierarchy, without understanding the tags
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themselves, and is similar to the standard section numbering used
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in technical documents. Level values [1..3f] are used for common
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tags, values [41..9f] for the notes file and [a1..ff] for the data
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file.
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The basic block graph file contains the following records
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note: unit function-graph*
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unit: header int32:checksum string:source
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function-graph: announce_function basic_blocks {arcs | lines}*
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announce_function: header int32:ident int32:checksum
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string:name string:source int32:lineno
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basic_block: header int32:flags*
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arcs: header int32:block_no arc*
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arc: int32:dest_block int32:flags
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lines: header int32:block_no line*
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int32:0 string:NULL
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line: int32:line_no | int32:0 string:filename
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The BASIC_BLOCK record holds per-bb flags. The number of blocks
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can be inferred from its data length. There is one ARCS record per
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basic block. The number of arcs from a bb is implicit from the
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data length. It enumerates the destination bb and per-arc flags.
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There is one LINES record per basic block, it enumerates the source
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lines which belong to that basic block. Source file names are
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introduced by a line number of 0, following lines are from the new
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source file. The initial source file for the function is NULL, but
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the current source file should be remembered from one LINES record
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to the next. The end of a block is indicated by an empty filename
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- this does not reset the current source file. Note there is no
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ordering of the ARCS and LINES records: they may be in any order,
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interleaved in any manner. The current filename follows the order
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the LINES records are stored in the file, *not* the ordering of the
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blocks they are for.
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The data file contains the following records.
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data: {unit function-data* summary:object summary:program*}*
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unit: header int32:checksum
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function-data: announce_function arc_counts
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announce_function: header int32:ident int32:checksum
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arc_counts: header int64:count*
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summary: int32:checksum {count-summary}GCOV_COUNTERS
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count-summary: int32:num int32:runs int64:sum
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int64:max int64:sum_max
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The ANNOUNCE_FUNCTION record is the same as that in the note file,
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but without the source location. The ARC_COUNTS gives the counter
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values for those arcs that are instrumented. The SUMMARY records
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give information about the whole object file and about the whole
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program. The checksum is used for whole program summaries, and
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disambiguates different programs which include the same
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instrumented object file. There may be several program summaries,
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each with a unique checksum. The object summary's checksum is zero.
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Note that the data file might contain information from several runs
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concatenated, or the data might be merged.
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This file is included by both the compiler, gcov tools and the
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runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to
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distinguish which case is which. If IN_LIBGCOV is nonzero,
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libgcov is being built. If IN_GCOV is nonzero, the gcov tools are
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being built. Otherwise the compiler is being built. IN_GCOV may be
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positive or negative. If positive, we are compiling a tool that
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requires additional functions (see the code for knowledge of what
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those functions are). */
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#ifndef GCC_GCOV_IO_H
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#define GCC_GCOV_IO_H
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#if IN_LIBGCOV
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/* About the target */
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#if BITS_PER_UNIT == 8
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typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI)));
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typedef unsigned gcov_position_t __attribute__ ((mode (SI)));
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#if LONG_LONG_TYPE_SIZE > 32
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typedef signed gcov_type __attribute__ ((mode (DI)));
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#else
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typedef signed gcov_type __attribute__ ((mode (SI)));
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#endif
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#else
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#if BITS_PER_UNIT == 16
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typedef unsigned gcov_unsigned_t __attribute__ ((mode (HI)));
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typedef unsigned gcov_position_t __attribute__ ((mode (HI)));
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#if LONG_LONG_TYPE_SIZE > 32
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typedef signed gcov_type __attribute__ ((mode (SI)));
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#else
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typedef signed gcov_type __attribute__ ((mode (HI)));
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#endif
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#else
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typedef unsigned gcov_unsigned_t __attribute__ ((mode (QI)));
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typedef unsigned gcov_position_t __attribute__ ((mode (QI)));
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#if LONG_LONG_TYPE_SIZE > 32
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typedef signed gcov_type __attribute__ ((mode (HI)));
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#else
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typedef signed gcov_type __attribute__ ((mode (QI)));
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#endif
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#endif
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#endif
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#if defined (TARGET_HAS_F_SETLKW)
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#define GCOV_LOCKED 1
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#else
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#define GCOV_LOCKED 0
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#endif
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#else /* !IN_LIBGCOV */
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/* About the host */
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typedef unsigned gcov_unsigned_t;
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typedef unsigned gcov_position_t;
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/* gcov_type is typedef'd elsewhere for the compiler */
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#if IN_GCOV
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#define GCOV_LINKAGE static
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typedef HOST_WIDEST_INT gcov_type;
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#if IN_GCOV > 0
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#include <sys/types.h>
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#endif
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#else /*!IN_GCOV */
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#if LONG_LONG_TYPE_SIZE > 32
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#define GCOV_TYPE_NODE intDI_type_node
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#else
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#define GCOV_TYPE_NODE intSI_type_node
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#endif
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#endif
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#if defined (HOST_HAS_F_SETLKW)
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#define GCOV_LOCKED 1
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#else
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#define GCOV_LOCKED 0
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#endif
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#endif /* !IN_LIBGCOV */
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/* In gcov we want function linkage to be static. In libgcov we need
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these functions to be extern, so prefix them with __gcov. In the
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compiler we want it extern, so that they can be accessed from
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elsewhere. */
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#if IN_LIBGCOV
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#define gcov_var __gcov_var
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#define gcov_open __gcov_open
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#define gcov_close __gcov_close
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#define gcov_write_tag_length __gcov_write_tag_length
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#define gcov_position __gcov_position
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#define gcov_seek __gcov_seek
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#define gcov_rewrite __gcov_rewrite
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#define gcov_is_error __gcov_is_error
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#define gcov_is_eof __gcov_is_eof
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#define gcov_write_unsigned __gcov_write_unsigned
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#define gcov_write_counter __gcov_write_counter
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#define gcov_write_summary __gcov_write_summary
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#define gcov_read_unsigned __gcov_read_unsigned
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#define gcov_read_counter __gcov_read_counter
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#define gcov_read_summary __gcov_read_summary
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/* Poison these, so they don't accidentally slip in. */
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#pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length
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#pragma GCC poison gcov_read_string gcov_sync gcov_time gcov_magic
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#endif
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#ifndef GCOV_LINKAGE
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#define GCOV_LINKAGE extern
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#endif
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/* File suffixes. */
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#define GCOV_DATA_SUFFIX ".gcda"
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#define GCOV_NOTE_SUFFIX ".gcno"
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/* File magic. Must not be palindromes. */
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#define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */
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#define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */
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/* gcov-iov.h is automatically generated by the makefile from
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version.c, it looks like
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#define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef)
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*/
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#include "gcov-iov.h"
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/* Convert a magic or version number to a 4 character string. */
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#define GCOV_UNSIGNED2STRING(ARRAY,VALUE) \
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((ARRAY)[0] = (char)((VALUE) >> 24), \
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(ARRAY)[1] = (char)((VALUE) >> 16), \
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(ARRAY)[2] = (char)((VALUE) >> 8), \
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(ARRAY)[3] = (char)((VALUE) >> 0))
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/* The record tags. Values [1..3f] are for tags which may be in either
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file. Values [41..9f] for those in the note file and [a1..ff] for
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the data file. */
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#define GCOV_TAG_FUNCTION ((gcov_unsigned_t)0x01000000)
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#define GCOV_TAG_FUNCTION_LENGTH (2)
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#define GCOV_TAG_BLOCKS ((gcov_unsigned_t)0x01410000)
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#define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM)
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#define GCOV_TAG_BLOCKS_NUM(LENGTH) (LENGTH)
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#define GCOV_TAG_ARCS ((gcov_unsigned_t)0x01430000)
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#define GCOV_TAG_ARCS_LENGTH(NUM) (1 + (NUM) * 2)
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#define GCOV_TAG_ARCS_NUM(LENGTH) (((LENGTH) - 1) / 2)
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#define GCOV_TAG_LINES ((gcov_unsigned_t)0x01450000)
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#define GCOV_TAG_COUNTER_BASE ((gcov_unsigned_t)0x01a10000)
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#define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2)
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#define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2)
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#define GCOV_TAG_OBJECT_SUMMARY ((gcov_unsigned_t)0xa1000000)
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#define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000)
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#define GCOV_TAG_SUMMARY_LENGTH \
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(1 + GCOV_COUNTERS_SUMMABLE * (2 + 3 * 2))
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/* Counters that are collected. */
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#define GCOV_COUNTER_ARCS 0 /* Arc transitions. */
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#define GCOV_COUNTERS_SUMMABLE 1 /* Counters which can be
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summaried. */
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#define GCOV_FIRST_VALUE_COUNTER 1 /* The first of counters used for value
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profiling. They must form a consecutive
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interval and their order must match
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the order of HIST_TYPEs in
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value-prof.h. */
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#define GCOV_COUNTER_V_INTERVAL 1 /* Histogram of value inside an interval. */
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#define GCOV_COUNTER_V_POW2 2 /* Histogram of exact power2 logarithm
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of a value. */
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#define GCOV_COUNTER_V_SINGLE 3 /* The most common value of expression. */
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#define GCOV_COUNTER_V_DELTA 4 /* The most common difference between
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consecutive values of expression. */
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#define GCOV_LAST_VALUE_COUNTER 4 /* The last of counters used for value
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profiling. */
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#define GCOV_COUNTERS 5
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/* Number of counters used for value profiling. */
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#define GCOV_N_VALUE_COUNTERS \
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(GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1)
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/* A list of human readable names of the counters */
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#define GCOV_COUNTER_NAMES {"arcs", "interval", "pow2", "single", "delta"}
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/* Names of merge functions for counters. */
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#define GCOV_MERGE_FUNCTIONS {"__gcov_merge_add", \
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"__gcov_merge_add", \
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"__gcov_merge_add", \
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"__gcov_merge_single", \
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"__gcov_merge_delta"}
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/* Convert a counter index to a tag. */
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#define GCOV_TAG_FOR_COUNTER(COUNT) \
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(GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17))
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/* Convert a tag to a counter. */
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#define GCOV_COUNTER_FOR_TAG(TAG) \
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((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17))
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/* Check whether a tag is a counter tag. */
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#define GCOV_TAG_IS_COUNTER(TAG) \
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(!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS)
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/* The tag level mask has 1's in the position of the inner levels, &
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the lsb of the current level, and zero on the current and outer
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levels. */
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#define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG))
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/* Return nonzero if SUB is an immediate subtag of TAG. */
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#define GCOV_TAG_IS_SUBTAG(TAG,SUB) \
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(GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB) \
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&& !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG)))
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/* Return nonzero if SUB is at a sublevel to TAG. */
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#define GCOV_TAG_IS_SUBLEVEL(TAG,SUB) \
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(GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB))
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/* Basic block flags. */
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#define GCOV_BLOCK_UNEXPECTED (1 << 1)
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/* Arc flags. */
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#define GCOV_ARC_ON_TREE (1 << 0)
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#define GCOV_ARC_FAKE (1 << 1)
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#define GCOV_ARC_FALLTHROUGH (1 << 2)
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/* Structured records. */
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/* Cumulative counter data. */
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struct gcov_ctr_summary
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{
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gcov_unsigned_t num; /* number of counters. */
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gcov_unsigned_t runs; /* number of program runs */
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gcov_type sum_all; /* sum of all counters accumulated. */
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gcov_type run_max; /* maximum value on a single run. */
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gcov_type sum_max; /* sum of individual run max values. */
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};
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/* Object & program summary record. */
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struct gcov_summary
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{
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gcov_unsigned_t checksum; /* checksum of program */
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struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE];
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};
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/* Structures embedded in coveraged program. The structures generated
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by write_profile must match these. */
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#if IN_LIBGCOV
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/* Information about a single function. This uses the trailing array
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idiom. The number of counters is determined from the counter_mask
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in gcov_info. We hold an array of function info, so have to
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explicitly calculate the correct array stride. */
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struct gcov_fn_info
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{
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gcov_unsigned_t ident; /* unique ident of function */
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gcov_unsigned_t checksum; /* function checksum */
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unsigned n_ctrs[0]; /* instrumented counters */
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};
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/* Type of function used to merge counters. */
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typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t);
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/* Information about counters. */
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struct gcov_ctr_info
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{
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gcov_unsigned_t num; /* number of counters. */
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gcov_type *values; /* their values. */
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gcov_merge_fn merge; /* The function used to merge them. */
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};
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/* Information about a single object file. */
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struct gcov_info
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{
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gcov_unsigned_t version; /* expected version number */
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struct gcov_info *next; /* link to next, used by libgcov */
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gcov_unsigned_t stamp; /* uniquifying time stamp */
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const char *filename; /* output file name */
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unsigned n_functions; /* number of functions */
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const struct gcov_fn_info *functions; /* table of functions */
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unsigned ctr_mask; /* mask of counters instrumented. */
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struct gcov_ctr_info counts[0]; /* count data. The number of bits
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set in the ctr_mask field
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determines how big this array
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is. */
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};
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/* Register a new object file module. */
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extern void __gcov_init (struct gcov_info *);
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/* Called before fork, to avoid double counting. */
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extern void __gcov_flush (void);
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/* The merge function that just sums the counters. */
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extern void __gcov_merge_add (gcov_type *, unsigned);
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/* The merge function to choose the most common value. */
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extern void __gcov_merge_single (gcov_type *, unsigned);
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/* The merge function to choose the most common difference between
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consecutive values. */
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extern void __gcov_merge_delta (gcov_type *, unsigned);
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#endif /* IN_LIBGCOV */
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#if IN_LIBGCOV >= 0
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/* Optimum number of gcov_unsigned_t's read from or written to disk. */
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#define GCOV_BLOCK_SIZE (1 << 10)
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GCOV_LINKAGE struct gcov_var
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{
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FILE *file;
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gcov_position_t start; /* Position of first byte of block */
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unsigned offset; /* Read/write position within the block. */
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unsigned length; /* Read limit in the block. */
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unsigned overread; /* Number of words overread. */
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int error; /* < 0 overflow, > 0 disk error. */
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int mode; /* < 0 writing, > 0 reading */
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#if IN_LIBGCOV
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/* Holds one block plus 4 bytes, thus all coverage reads & writes
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fit within this buffer and we always can transfer GCOV_BLOCK_SIZE
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to and from the disk. libgcov never backtracks and only writes 4
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or 8 byte objects. */
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gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1];
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#else
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int endian; /* Swap endianness. */
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/* Holds a variable length block, as the compiler can write
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strings and needs to backtrack. */
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size_t alloc;
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gcov_unsigned_t *buffer;
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#endif
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} gcov_var;
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/* Functions for reading and writing gcov files. In libgcov you can
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open the file for reading then writing. Elsewhere you can open the
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file either for reading or for writing. When reading a file you may
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use the gcov_read_* functions, gcov_sync, gcov_position, &
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gcov_error. When writing a file you may use the gcov_write
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functions, gcov_seek & gcov_error. When a file is to be rewritten
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you use the functions for reading, then gcov_rewrite then the
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functions for writing. Your file may become corrupted if you break
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these invariants. */
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#if IN_LIBGCOV
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GCOV_LINKAGE int gcov_open (const char */*name*/);
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#else
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GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/);
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GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t);
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#endif
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GCOV_LINKAGE int gcov_close (void);
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/* Available everywhere. */
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static gcov_position_t gcov_position (void);
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static int gcov_is_error (void);
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static int gcov_is_eof (void);
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GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void);
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GCOV_LINKAGE gcov_type gcov_read_counter (void);
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GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *);
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#if IN_LIBGCOV
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/* Available only in libgcov */
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GCOV_LINKAGE void gcov_write_counter (gcov_type);
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GCOV_LINKAGE void gcov_write_tag_length (gcov_unsigned_t, gcov_unsigned_t);
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GCOV_LINKAGE void gcov_write_summary (gcov_unsigned_t /*tag*/,
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const struct gcov_summary *);
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static void gcov_truncate (void);
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static void gcov_rewrite (void);
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GCOV_LINKAGE void gcov_seek (gcov_position_t /*position*/);
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#else
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/* Available outside libgcov */
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GCOV_LINKAGE const char *gcov_read_string (void);
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GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/,
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gcov_unsigned_t /*length */);
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#endif
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#if !IN_GCOV
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/* Available outside gcov */
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GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t);
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#endif
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#if !IN_GCOV && !IN_LIBGCOV
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/* Available only in compiler */
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GCOV_LINKAGE void gcov_write_string (const char *);
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GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t);
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GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/);
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#endif
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#if IN_GCOV > 0
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/* Available in gcov */
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|
GCOV_LINKAGE time_t gcov_time (void);
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#endif
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/* Make sure the library is used correctly. */
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|
#if ENABLE_CHECKING
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#define GCOV_CHECK(expr) ((expr) ? (void)0 : (void)abort ())
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#else
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#define GCOV_CHECK(expr)
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#endif
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#define GCOV_CHECK_READING() GCOV_CHECK(gcov_var.mode > 0)
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#define GCOV_CHECK_WRITING() GCOV_CHECK(gcov_var.mode < 0)
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/* Save the current position in the gcov file. */
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static inline gcov_position_t
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gcov_position (void)
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{
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GCOV_CHECK_READING ();
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return gcov_var.start + gcov_var.offset;
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}
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/* Return nonzero if we read to end of file. */
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static inline int
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|
gcov_is_eof (void)
|
|
{
|
|
return !gcov_var.overread;
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|
}
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|
/* Return nonzero if the error flag is set. */
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|
static inline int
|
|
gcov_is_error (void)
|
|
{
|
|
return gcov_var.file ? gcov_var.error : 1;
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|
}
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|
|
#if IN_LIBGCOV
|
|
/* Move to beginning of file and initialize for writing. */
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|
|
static inline void
|
|
gcov_rewrite (void)
|
|
{
|
|
GCOV_CHECK_READING ();
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|
gcov_var.mode = -1;
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|
gcov_var.start = 0;
|
|
gcov_var.offset = 0;
|
|
fseek (gcov_var.file, 0L, SEEK_SET);
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|
}
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|
#ifdef __MINGW32__
|
|
#define ftruncate _chsize
|
|
#endif
|
|
static inline void
|
|
gcov_truncate (void)
|
|
{
|
|
ftruncate (fileno (gcov_var.file), 0L);
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|
}
|
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#endif
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|
#endif /* IN_LIBGCOV >= 0 */
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|
#endif /* GCC_GCOV_IO_H */
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