/* File format for coverage information Copyright (C) 1996-2018 Free Software Foundation, Inc. Contributed by Bob Manson . Completely remangled by Nathan Sidwell . This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see . */ /* Coverage information is held in two files. A notes file, which is generated by the compiler, and a data file, which is generated by the program under test. Both files use a similar structure. We do not attempt to make these files backwards compatible with previous versions, as you only need coverage information when developing a program. We do hold version information, so that mismatches can be detected, and we use a format that allows tools to skip information they do not understand or are not interested in. Numbers are recorded in the 32 bit unsigned binary form of the endianness of the machine generating the file. 64 bit numbers are stored as two 32 bit numbers, the low part first. Strings are padded with 1 to 4 NUL bytes, to bring the length up to a multiple of 4. The number of 4 bytes is stored, followed by the padded string. Zero length and NULL strings are simply stored as a length of zero (they have no trailing NUL or padding). int32: byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3 int64: int32:low int32:high string: int32:0 | int32:length char* char:0 padding padding: | char:0 | char:0 char:0 | char:0 char:0 char:0 item: int32 | int64 | string The basic format of the notes file is file : int32:magic int32:version int32:stamp int32:support_unexecuted_blocks record* The basic format of the data file is file : int32:magic int32:version int32:stamp record* The magic ident is different for the notes and the data files. The magic ident is used to determine the endianness of the file, when reading. The version is the same for both files and is derived from gcc's version number. The stamp value is used to synchronize note and data files and to synchronize merging within a data file. It need not be an absolute time stamp, merely a ticker that increments fast enough and cycles slow enough to distinguish different compile/run/compile cycles. Although the ident and version are formally 32 bit numbers, they are derived from 4 character ASCII strings. The version number consists of a two character major version number (first digit starts from 'A' letter to not to clash with the older numbering scheme), the single character minor version number, and a single character indicating the status of the release. That will be 'e' experimental, 'p' prerelease and 'r' for release. Because, by good fortune, these are in alphabetical order, string collating can be used to compare version strings. Be aware that the 'e' designation will (naturally) be unstable and might be incompatible with itself. For gcc 17.0 experimental, it would be 'B70e' (0x42373065). As we currently do not release more than 5 minor releases, the single character should be always fine. Major number is currently changed roughly every year, which gives us space for next 250 years (maximum allowed number would be 259.9). A record has a tag, length and variable amount of data. record: header data header: int32:tag int32:length data: item* Records are not nested, but there is a record hierarchy. Tag numbers reflect this hierarchy. Tags are unique across note and data files. Some record types have a varying amount of data. The LENGTH is the number of 4bytes that follow and is usually used to determine how much data. The tag value is split into 4 8-bit fields, one for each of four possible levels. The most significant is allocated first. Unused levels are zero. Active levels are odd-valued, so that the LSB of the level is one. A sub-level incorporates the values of its superlevels. This formatting allows you to determine the tag hierarchy, without understanding the tags themselves, and is similar to the standard section numbering used in technical documents. Level values [1..3f] are used for common tags, values [41..9f] for the notes file and [a1..ff] for the data file. The notes file contains the following records note: unit function-graph* unit: header int32:checksum string:source function-graph: announce_function basic_blocks {arcs | lines}* announce_function: header int32:ident int32:lineno_checksum int32:cfg_checksum string:name string:source int32:start_lineno int32:start_column int32:end_lineno basic_block: header int32:flags* arcs: header int32:block_no arc* arc: int32:dest_block int32:flags lines: header int32:block_no line* int32:0 string:NULL line: int32:line_no | int32:0 string:filename The BASIC_BLOCK record holds per-bb flags. The number of blocks can be inferred from its data length. There is one ARCS record per basic block. The number of arcs from a bb is implicit from the data length. It enumerates the destination bb and per-arc flags. There is one LINES record per basic block, it enumerates the source lines which belong to that basic block. Source file names are introduced by a line number of 0, following lines are from the new source file. The initial source file for the function is NULL, but the current source file should be remembered from one LINES record to the next. The end of a block is indicated by an empty filename - this does not reset the current source file. Note there is no ordering of the ARCS and LINES records: they may be in any order, interleaved in any manner. The current filename follows the order the LINES records are stored in the file, *not* the ordering of the blocks they are for. The data file contains the following records. data: {unit summary:object summary:program* function-data*}* unit: header int32:checksum function-data: announce_function present counts announce_function: header int32:ident int32:lineno_checksum int32:cfg_checksum present: header int32:present counts: header int64:count* summary: int32:checksum int32:num int32:runs int64:sum int64:max int64:sum_max histogram histogram: {int32:bitvector}8 histogram-buckets* histogram-buckets: int32:num int64:min int64:sum The ANNOUNCE_FUNCTION record is the same as that in the note file, but without the source location. The COUNTS gives the counter values for instrumented features. The about the whole program. The checksum is used for whole program summaries, and disambiguates different programs which include the same instrumented object file. There may be several program summaries, each with a unique checksum. The object summary's checksum is zero. Note that the data file might contain information from several runs concatenated, or the data might be merged. This file is included by both the compiler, gcov tools and the runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to distinguish which case is which. If IN_LIBGCOV is nonzero, libgcov is being built. If IN_GCOV is nonzero, the gcov tools are being built. Otherwise the compiler is being built. IN_GCOV may be positive or negative. If positive, we are compiling a tool that requires additional functions (see the code for knowledge of what those functions are). */ #ifndef GCC_GCOV_IO_H #define GCC_GCOV_IO_H #ifndef IN_LIBGCOV /* About the host */ typedef unsigned gcov_unsigned_t; typedef unsigned gcov_position_t; /* gcov_type is typedef'd elsewhere for the compiler */ #if IN_GCOV #define GCOV_LINKAGE static typedef int64_t gcov_type; typedef uint64_t gcov_type_unsigned; #if IN_GCOV > 0 #include #endif #endif #if defined (HOST_HAS_F_SETLKW) #define GCOV_LOCKED 1 #else #define GCOV_LOCKED 0 #endif #define ATTRIBUTE_HIDDEN #endif /* !IN_LIBGOCV */ #ifndef GCOV_LINKAGE #define GCOV_LINKAGE extern #endif #if IN_LIBGCOV #define gcov_nonruntime_assert(EXPR) ((void)(0 && (EXPR))) #else #define gcov_nonruntime_assert(EXPR) gcc_assert (EXPR) #define gcov_error(...) fatal_error (input_location, __VA_ARGS__) #endif /* File suffixes. */ #define GCOV_DATA_SUFFIX ".gcda" #define GCOV_NOTE_SUFFIX ".gcno" /* File magic. Must not be palindromes. */ #define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */ #define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */ /* gcov-iov.h is automatically generated by the makefile from version.c, it looks like #define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef) */ #include "gcov-iov.h" /* Convert a magic or version number to a 4 character string. */ #define GCOV_UNSIGNED2STRING(ARRAY,VALUE) \ ((ARRAY)[0] = (char)((VALUE) >> 24), \ (ARRAY)[1] = (char)((VALUE) >> 16), \ (ARRAY)[2] = (char)((VALUE) >> 8), \ (ARRAY)[3] = (char)((VALUE) >> 0)) /* The record tags. Values [1..3f] are for tags which may be in either file. Values [41..9f] for those in the note file and [a1..ff] for the data file. The tag value zero is used as an explicit end of file marker -- it is not required to be present. */ #define GCOV_TAG_FUNCTION ((gcov_unsigned_t)0x01000000) #define GCOV_TAG_FUNCTION_LENGTH (3) #define GCOV_TAG_BLOCKS ((gcov_unsigned_t)0x01410000) #define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM) #define GCOV_TAG_ARCS ((gcov_unsigned_t)0x01430000) #define GCOV_TAG_ARCS_LENGTH(NUM) (1 + (NUM) * 2) #define GCOV_TAG_ARCS_NUM(LENGTH) (((LENGTH) - 1) / 2) #define GCOV_TAG_LINES ((gcov_unsigned_t)0x01450000) #define GCOV_TAG_COUNTER_BASE ((gcov_unsigned_t)0x01a10000) #define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2) #define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2) #define GCOV_TAG_OBJECT_SUMMARY ((gcov_unsigned_t)0xa1000000) /* Obsolete */ #define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000) #define GCOV_TAG_SUMMARY_LENGTH(NUM) (1 + (10 + 3 * 2) + (NUM) * 5) #define GCOV_TAG_AFDO_FILE_NAMES ((gcov_unsigned_t)0xaa000000) #define GCOV_TAG_AFDO_FUNCTION ((gcov_unsigned_t)0xac000000) #define GCOV_TAG_AFDO_WORKING_SET ((gcov_unsigned_t)0xaf000000) /* Counters that are collected. */ #define DEF_GCOV_COUNTER(COUNTER, NAME, MERGE_FN) COUNTER, enum { #include "gcov-counter.def" GCOV_COUNTERS }; #undef DEF_GCOV_COUNTER /* The first of counters used for value profiling. They must form a consecutive interval and their order must match the order of HIST_TYPEs in value-prof.h. */ #define GCOV_FIRST_VALUE_COUNTER GCOV_COUNTER_V_INTERVAL /* The last of counters used for value profiling. */ #define GCOV_LAST_VALUE_COUNTER (GCOV_COUNTERS - 1) /* Number of counters used for value profiling. */ #define GCOV_N_VALUE_COUNTERS \ (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1) /* The number of hottest callees to be tracked. */ #define GCOV_ICALL_TOPN_VAL 2 /* The number of counter entries per icall callsite. */ #define GCOV_ICALL_TOPN_NCOUNTS (1 + GCOV_ICALL_TOPN_VAL * 4) /* Convert a counter index to a tag. */ #define GCOV_TAG_FOR_COUNTER(COUNT) \ (GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17)) /* Convert a tag to a counter. */ #define GCOV_COUNTER_FOR_TAG(TAG) \ ((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17)) /* Check whether a tag is a counter tag. */ #define GCOV_TAG_IS_COUNTER(TAG) \ (!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS) /* The tag level mask has 1's in the position of the inner levels, & the lsb of the current level, and zero on the current and outer levels. */ #define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG)) /* Return nonzero if SUB is an immediate subtag of TAG. */ #define GCOV_TAG_IS_SUBTAG(TAG,SUB) \ (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB) \ && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK (TAG))) /* Return nonzero if SUB is at a sublevel to TAG. */ #define GCOV_TAG_IS_SUBLEVEL(TAG,SUB) \ (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB)) /* Basic block flags. */ #define GCOV_BLOCK_UNEXPECTED (1 << 1) /* Arc flags. */ #define GCOV_ARC_ON_TREE (1 << 0) #define GCOV_ARC_FAKE (1 << 1) #define GCOV_ARC_FALLTHROUGH (1 << 2) /* Structured records. */ /* Structure used for each bucket of the log2 histogram of counter values. */ typedef struct { /* Number of counters whose profile count falls within the bucket. */ gcov_unsigned_t num_counters; /* Smallest profile count included in this bucket. */ gcov_type min_value; /* Cumulative value of the profile counts in this bucket. */ gcov_type cum_value; } gcov_bucket_type; /* For a log2 scale histogram with each range split into 4 linear sub-ranges, there will be at most 64 (max gcov_type bit size) - 1 log2 ranges since the lowest 2 log2 values share the lowest 4 linear sub-range (values 0 - 3). This is 252 total entries (63*4). */ #define GCOV_HISTOGRAM_SIZE 252 /* How many unsigned ints are required to hold a bit vector of non-zero histogram entries when the histogram is written to the gcov file. This is essentially a ceiling divide by 32 bits. */ #define GCOV_HISTOGRAM_BITVECTOR_SIZE (GCOV_HISTOGRAM_SIZE + 31) / 32 /* Object & program summary record. */ struct gcov_summary { gcov_unsigned_t checksum; /* Checksum of program. */ gcov_unsigned_t num; /* Number of counters. */ gcov_unsigned_t runs; /* Number of program runs. */ gcov_type sum_all; /* Sum of all counters accumulated. */ gcov_type run_max; /* Maximum value on a single run. */ gcov_type sum_max; /* Sum of individual run max values. */ gcov_bucket_type histogram[GCOV_HISTOGRAM_SIZE]; /* Histogram of counter values. */ }; #if !defined(inhibit_libc) /* Functions for reading and writing gcov files. In libgcov you can open the file for reading then writing. Elsewhere you can open the file either for reading or for writing. When reading a file you may use the gcov_read_* functions, gcov_sync, gcov_position, & gcov_error. When writing a file you may use the gcov_write functions, gcov_seek & gcov_error. When a file is to be rewritten you use the functions for reading, then gcov_rewrite then the functions for writing. Your file may become corrupted if you break these invariants. */ #if !IN_LIBGCOV GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/); GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t); #endif /* Available everywhere. */ GCOV_LINKAGE int gcov_close (void) ATTRIBUTE_HIDDEN; GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void) ATTRIBUTE_HIDDEN; GCOV_LINKAGE gcov_type gcov_read_counter (void) ATTRIBUTE_HIDDEN; GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *) ATTRIBUTE_HIDDEN; GCOV_LINKAGE const char *gcov_read_string (void); GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/, gcov_unsigned_t /*length */); char *mangle_path (char const *base); #if !IN_GCOV /* Available outside gcov */ GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN; #endif #if !IN_GCOV && !IN_LIBGCOV /* Available only in compiler */ GCOV_LINKAGE unsigned gcov_histo_index (gcov_type value); GCOV_LINKAGE void gcov_write_string (const char *); GCOV_LINKAGE void gcov_write_filename (const char *); GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t); GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/); #endif #if IN_GCOV <= 0 && !IN_LIBGCOV /* Available in gcov-dump and the compiler. */ /* Number of data points in the working set summary array. Using 128 provides information for at least every 1% increment of the total profile size. The last entry is hardwired to 99.9% of the total. */ #define NUM_GCOV_WORKING_SETS 128 /* Working set size statistics for a given percentage of the entire profile (sum_all from the counter summary). */ typedef struct gcov_working_set_info { /* Number of hot counters included in this working set. */ unsigned num_counters; /* Smallest counter included in this working set. */ gcov_type min_counter; } gcov_working_set_t; GCOV_LINKAGE void compute_working_sets (const gcov_summary *summary, gcov_working_set_t *gcov_working_sets); #endif #if IN_GCOV > 0 /* Available in gcov */ GCOV_LINKAGE time_t gcov_time (void); #endif #endif /* !inhibit_libc */ #endif /* GCC_GCOV_IO_H */