LCOMP(1) LCOMP(1)
NAME
lcomp, lprint - line-by-line profiler
SYNOPSIS
lcomp [options] ... file ...
lprint [options] [files]
DESCRIPTION
Lcomp is used in place of cc (1) or f77 (1) to insert
instruction-counting code into programs. It recognizes
options whose initial letters are taken from the string
``cwpDUIRdlNnz'', and accepts files whose names end in `.c',
`.f', `.s', or `.o'. From each source file it derives a
`.o' file and a `.sL' file which lprint uses to correlate
source lines with basic blocks. If the -c option is not
present it creates a.out. Each time the `a.out' file is run
statistics are added to a profiling file prof.out.
Lprint produces on the standard output a listing (in the
style of pr(1)) of the programs compiled by lcomp. Without
arguments or files, each line of the listing is preceded by
the number of times it was executed, as determined from the
data in prof.out. Lprint interprets the following options.
-a Detailed listing of every machine instruction and how
often it was executed.
-b Attempts to indicate how often each basic block was
executed.
-c Compress the prof.out file, which otherwise grows with
every execution of a.out .
-f Print summary information by function: instruction exe-
cutions, number of invocations, source instructions,
and number of instructions never executed.
-i Before each line of source print the number of machine
instructions executed.
-p Before each line of source print the number of times
the first basic block in that line was executed.
-s Summarize the counts by source file: instruction exec-
tuions, source instructions, instructions never exe-
cuted, basic block executions, total number of source
basic blocks, and how many were never executed.
If any file names are given, the arguments "abip" apply only
LCOMP(1) LCOMP(1)
to them. If no options are given, -p is assumed. Any com-
bination of options is allowed.
FILES
prof.out counts
*.sL for correlating with source
/usr/lib/bb finding basic blocks and inserting counting
code
/usr/lib/nexit.oprinting counts when `a.out' exits
SEE ALSO
cc(1), f77(1)
BUGS
A line in the source file may be in zero, one, or more basic
blocks; the count given in the listing corresponds to some
particular choice of the basic block to associate with the
line.
Processing the output of yacc(1) without removing `#line'
directives will produce unsatisfactory results.