416 lines
12 KiB
Groff
416 lines
12 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "GCOV-TOOL 1"
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.TH GCOV-TOOL 1 "2023-07-27" "gcc-13.2.0" "GNU"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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gcov\-tool \- offline gcda profile processing tool
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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gcov-tool [\fB\-v\fR|\fB\-\-version\fR] [\fB\-h\fR|\fB\-\-help\fR]
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.PP
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gcov-tool merge [merge\-options] \fIdirectory1\fR \fIdirectory2\fR
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[\fB\-o\fR|\fB\-\-output\fR \fIdirectory\fR]
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[\fB\-v\fR|\fB\-\-verbose\fR]
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[\fB\-w\fR|\fB\-\-weight\fR \fIw1,w2\fR]
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.PP
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gcov-tool merge-stream [merge\-stream\-options] [\fIfile\fR]
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[\fB\-v\fR|\fB\-\-verbose\fR]
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[\fB\-w\fR|\fB\-\-weight\fR \fIw1,w2\fR]
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.PP
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gcov-tool rewrite [rewrite\-options] \fIdirectory\fR
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[\fB\-n\fR|\fB\-\-normalize\fR \fIlong_long_value\fR]
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[\fB\-o\fR|\fB\-\-output\fR \fIdirectory\fR]
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[\fB\-s\fR|\fB\-\-scale\fR \fIfloat_or_simple\-frac_value\fR]
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[\fB\-v\fR|\fB\-\-verbose\fR]
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.PP
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gcov-tool overlap [overlap\-options] \fIdirectory1\fR \fIdirectory2\fR
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[\fB\-f\fR|\fB\-\-function\fR]
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[\fB\-F\fR|\fB\-\-fullname\fR]
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[\fB\-h\fR|\fB\-\-hotonly\fR]
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[\fB\-o\fR|\fB\-\-object\fR]
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[\fB\-t\fR|\fB\-\-hot_threshold\fR] \fIfloat\fR
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[\fB\-v\fR|\fB\-\-verbose\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBgcov-tool\fR is an offline tool to process gcc's gcda profile files.
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.PP
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Current gcov-tool supports the following functionalities:
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.IP "*" 4
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merge two sets of profiles with weights.
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.IP "*" 4
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read a stream of profiles with associated filenames and merge it with a set of
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profiles with weights.
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.IP "*" 4
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read one set of profile and rewrite profile contents. One can scale or
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normalize the count values.
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.PP
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Examples of the use cases for this tool are:
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.IP "*" 4
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Collect the profiles for different set of inputs, and use this tool to merge
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them. One can specify the weight to factor in the relative importance of
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each input.
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.IP "*" 4
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Collect profiles from target systems without a filesystem (freestanding
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environments). Merge the collected profiles with associated profiles
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present on the host system. One can specify the weight to factor in the
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relative importance of each input.
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.IP "*" 4
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Rewrite the profile after removing a subset of the gcda files, while maintaining
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the consistency of the summary and the histogram.
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.IP "*" 4
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It can also be used to debug or libgcov code as the tools shares the majority
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code as the runtime library.
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.PP
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Note that for the merging operation, this profile generated offline may
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contain slight different values from the online merged profile. Here are
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a list of typical differences:
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.IP "*" 4
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histogram difference: This offline tool recomputes the histogram after merging
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the counters. The resulting histogram, therefore, is precise. The online
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merging does not have this capability \*(-- the histogram is merged from two
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histograms and the result is an approximation.
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.IP "*" 4
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summary checksum difference: Summary checksum uses a \s-1CRC32\s0 operation. The value
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depends on the link list order of gcov-info objects. This order is different in
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gcov-tool from that in the online merge. It's expected to have different
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summary checksums. It does not really matter as the compiler does not use this
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checksum anywhere.
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.IP "*" 4
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value profile counter values difference: Some counter values for value profile
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are runtime dependent, like heap addresses. It's normal to see some difference
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in these kind of counters.
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.IP "\fB\-h\fR" 4
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.IX Item "-h"
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.PD 0
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.IP "\fB\-\-help\fR" 4
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.IX Item "--help"
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.PD
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Display help about using \fBgcov-tool\fR (on the standard output), and
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exit without doing any further processing.
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.IP "\fB\-v\fR" 4
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.IX Item "-v"
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.PD 0
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.IP "\fB\-\-version\fR" 4
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.IX Item "--version"
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.PD
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Display the \fBgcov-tool\fR version number (on the standard output),
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and exit without doing any further processing.
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.IP "\fBmerge\fR" 4
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.IX Item "merge"
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Merge two profile directories.
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.RS 4
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.IP "\fB\-o\fR \fIdirectory\fR" 4
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.IX Item "-o directory"
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.PD 0
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.IP "\fB\-\-output\fR \fIdirectory\fR" 4
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.IX Item "--output directory"
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.PD
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Set the output profile directory. Default output directory name is
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\&\fImerged_profile\fR.
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.IP "\fB\-v\fR" 4
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.IX Item "-v"
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.PD 0
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.IP "\fB\-\-verbose\fR" 4
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.IX Item "--verbose"
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.PD
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Set the verbose mode.
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.IP "\fB\-w\fR \fIw1\fR\fB,\fR\fIw2\fR" 4
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.IX Item "-w w1,w2"
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.PD 0
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.IP "\fB\-\-weight\fR \fIw1\fR\fB,\fR\fIw2\fR" 4
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.IX Item "--weight w1,w2"
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.PD
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Set the merge weights of the \fIdirectory1\fR and \fIdirectory2\fR,
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respectively. The default weights are 1 for both.
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.RE
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.RS 4
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.RE
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.IP "\fBmerge-stream\fR" 4
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.IX Item "merge-stream"
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Collect profiles with associated filenames from a \fIgcfn\fR and \fIgcda\fR
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data stream. Read the stream from the file specified by \fIfile\fR or from
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\&\fIstdin\fR. Merge the profiles with associated profiles in the host
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filesystem. Apply the optional weights while merging profiles.
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.Sp
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For the generation of a \fIgcfn\fR and \fIgcda\fR data stream on the target
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system, please have a look at the \f(CW\*(C`_\|_gcov_filename_to_gcfn()\*(C'\fR and
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\&\f(CW\*(C`_\|_gcov_info_to_gcda()\*(C'\fR functions declared in \f(CW\*(C`#include <gcov.h>\*(C'\fR.
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.RS 4
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.IP "\fB\-v\fR" 4
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.IX Item "-v"
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.PD 0
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.IP "\fB\-\-verbose\fR" 4
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.IX Item "--verbose"
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.PD
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Set the verbose mode.
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.IP "\fB\-w\fR \fIw1\fR\fB,\fR\fIw2\fR" 4
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.IX Item "-w w1,w2"
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.PD 0
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.IP "\fB\-\-weight\fR \fIw1\fR\fB,\fR\fIw2\fR" 4
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.IX Item "--weight w1,w2"
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.PD
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Set the merge weights of the profiles from the \fIgcfn\fR and \fIgcda\fR data
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stream and the associated profiles in the host filesystem, respectively. The
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default weights are 1 for both.
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.RE
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.RS 4
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.RE
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.IP "\fBrewrite\fR" 4
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.IX Item "rewrite"
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Read the specified profile directory and rewrite to a new directory.
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.RS 4
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.IP "\fB\-n\fR \fIlong_long_value\fR" 4
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.IX Item "-n long_long_value"
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.PD 0
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.IP "\fB\-\-normalize <long_long_value>\fR" 4
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.IX Item "--normalize <long_long_value>"
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.PD
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Normalize the profile. The specified value is the max counter value
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in the new profile.
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.IP "\fB\-o\fR \fIdirectory\fR" 4
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.IX Item "-o directory"
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.PD 0
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.IP "\fB\-\-output\fR \fIdirectory\fR" 4
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.IX Item "--output directory"
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.PD
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Set the output profile directory. Default output name is \fIrewrite_profile\fR.
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.IP "\fB\-s\fR \fIfloat_or_simple\-frac_value\fR" 4
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.IX Item "-s float_or_simple-frac_value"
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.PD 0
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|
.IP "\fB\-\-scale\fR \fIfloat_or_simple\-frac_value\fR" 4
|
||
|
|
.IX Item "--scale float_or_simple-frac_value"
|
||
|
|
.PD
|
||
|
|
Scale the profile counters. The specified value can be in floating point value,
|
||
|
|
or simple fraction value form, such 1, 2, 2/3, and 5/3.
|
||
|
|
.IP "\fB\-v\fR" 4
|
||
|
|
.IX Item "-v"
|
||
|
|
.PD 0
|
||
|
|
.IP "\fB\-\-verbose\fR" 4
|
||
|
|
.IX Item "--verbose"
|
||
|
|
.PD
|
||
|
|
Set the verbose mode.
|
||
|
|
.RE
|
||
|
|
.RS 4
|
||
|
|
.RE
|
||
|
|
.IP "\fBoverlap\fR" 4
|
||
|
|
.IX Item "overlap"
|
||
|
|
Compute the overlap score between the two specified profile directories.
|
||
|
|
The overlap score is computed based on the arc profiles. It is defined as
|
||
|
|
the sum of min (p1_counter[i] / p1_sum_all, p2_counter[i] / p2_sum_all),
|
||
|
|
for all arc counter i, where p1_counter[i] and p2_counter[i] are two
|
||
|
|
matched counters and p1_sum_all and p2_sum_all are the sum of counter
|
||
|
|
values in profile 1 and profile 2, respectively.
|
||
|
|
.RS 4
|
||
|
|
.IP "\fB\-f\fR" 4
|
||
|
|
.IX Item "-f"
|
||
|
|
.PD 0
|
||
|
|
.IP "\fB\-\-function\fR" 4
|
||
|
|
.IX Item "--function"
|
||
|
|
.PD
|
||
|
|
Print function level overlap score.
|
||
|
|
.IP "\fB\-F\fR" 4
|
||
|
|
.IX Item "-F"
|
||
|
|
.PD 0
|
||
|
|
.IP "\fB\-\-fullname\fR" 4
|
||
|
|
.IX Item "--fullname"
|
||
|
|
.PD
|
||
|
|
Print full gcda filename.
|
||
|
|
.IP "\fB\-h\fR" 4
|
||
|
|
.IX Item "-h"
|
||
|
|
.PD 0
|
||
|
|
.IP "\fB\-\-hotonly\fR" 4
|
||
|
|
.IX Item "--hotonly"
|
||
|
|
.PD
|
||
|
|
Only print info for hot objects/functions.
|
||
|
|
.IP "\fB\-o\fR" 4
|
||
|
|
.IX Item "-o"
|
||
|
|
.PD 0
|
||
|
|
.IP "\fB\-\-object\fR" 4
|
||
|
|
.IX Item "--object"
|
||
|
|
.PD
|
||
|
|
Print object level overlap score.
|
||
|
|
.IP "\fB\-t\fR \fIfloat\fR" 4
|
||
|
|
.IX Item "-t float"
|
||
|
|
.PD 0
|
||
|
|
.IP "\fB\-\-hot_threshold <float>\fR" 4
|
||
|
|
.IX Item "--hot_threshold <float>"
|
||
|
|
.PD
|
||
|
|
Set the threshold for hot counter value.
|
||
|
|
.IP "\fB\-v\fR" 4
|
||
|
|
.IX Item "-v"
|
||
|
|
.PD 0
|
||
|
|
.IP "\fB\-\-verbose\fR" 4
|
||
|
|
.IX Item "--verbose"
|
||
|
|
.PD
|
||
|
|
Set the verbose mode.
|
||
|
|
.RE
|
||
|
|
.RS 4
|
||
|
|
.RE
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.IX Header "SEE ALSO"
|
||
|
|
\&\fBgpl\fR\|(7), \fBgfdl\fR\|(7), \fBfsf\-funding\fR\|(7), \fBgcc\fR\|(1), \fBgcov\fR\|(1) and the Info entry for
|
||
|
|
\&\fIgcc\fR.
|
||
|
|
.SH "COPYRIGHT"
|
||
|
|
.IX Header "COPYRIGHT"
|
||
|
|
Copyright (c) 2014\-2023 Free Software Foundation, Inc.
|
||
|
|
.PP
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the \s-1GNU\s0 Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being \*(L"\s-1GNU\s0 General Public License\*(R" and \*(L"Funding
|
||
|
|
Free Software\*(R", the Front-Cover texts being (a) (see below), and with
|
||
|
|
the Back-Cover Texts being (b) (see below). A copy of the license is
|
||
|
|
included in the \fBgfdl\fR\|(7) man page.
|
||
|
|
.PP
|
||
|
|
(a) The \s-1FSF\s0's Front-Cover Text is:
|
||
|
|
.PP
|
||
|
|
.Vb 1
|
||
|
|
\& A GNU Manual
|
||
|
|
.Ve
|
||
|
|
.PP
|
||
|
|
(b) The \s-1FSF\s0's Back-Cover Text is:
|
||
|
|
.PP
|
||
|
|
.Vb 3
|
||
|
|
\& You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
\& software. Copies published by the Free Software Foundation raise
|
||
|
|
\& funds for GNU development.
|
||
|
|
.Ve
|