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skrzyp |
// Slightly adapted from OpenBSD "/src/gnu/usr.bin/binutils/gprof/gmon_out.h"
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// for eCos environment
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/*
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* This file specifies the format of gmon.out files. It should have
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* as few external dependencies as possible as it is going to be
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* included in many different programs. That is, minimize the
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* number of #include's.
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*
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* A gmon.out file consists of a header (defined by gmon_hdr) followed
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* by a sequence of records. Each record starts with a one-byte tag
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* identifying the type of records, followed by records specific data.
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*/
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#ifndef gmon_out_h
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#define gmon_out_h
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#include <cyg/infra/cyg_type.h>
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#define GMON_MAGIC "gmon" /* magic cookie */
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#define GMON_VERSION 1 /* version number */
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/*
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* Raw header as it appears on file (without padding):
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*/
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struct gmon_hdr
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{
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char cookie[4];
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char version[4]; // a cyg_uint32, target-side endianness
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char spare[3 * 4];
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};
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/* types of records in this file: */
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typedef enum
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{
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GMON_TAG_TIME_HIST = 0, GMON_TAG_CG_ARC = 1, GMON_TAG_BB_COUNT = 2
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}
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GMON_Record_Tag;
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/* The histogram tag is followed by this header, and then an array of */
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/* cyg_uint16's for the actual counts. */
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struct gmon_hist_hdr
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{
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/* host-side gprof adapts to sizeof(void*) and endianness. */
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/* It is assumed that the compiler does not insert padding around the */
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/* cyg_uint32's or the char arrays. */
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void* low_pc; /* base pc address of sample buffer */
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void* high_pc; /* max pc address of sampled buffer */
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cyg_uint32 hist_size; /* size of sample buffer */
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cyg_uint32 prof_rate; /* profiling clock rate */
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char dimen[15]; /* phys. dim., usually "seconds" */
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char dimen_abbrev; /* usually 's' for "seconds" */
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};
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/* An arc tag is followed by a single arc record. self_pc corresponds to */
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/* the location of an mcount() call, at the start of a function. from_pc */
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/* corresponds to the return address, i.e. where the function was called */
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/* from. count is the number of calls. */
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struct gmon_cg_arc_record
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{
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void* from_pc; /* address within caller's body */
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void* self_pc; /* address within callee's body */
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cyg_uint32 count; /* number of arc traversals */
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};
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/* In theory gprof can also process basic block counts, as per the */
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/* compiler's -fprofile-arcs flag. The compiler-generated basic block */
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/* structure should contain a table of addresses and a table of counts, */
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/* and the compiled code updates those counts. Current versions of the */
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/* compiler (~3.2.1) do not output the table of addresses, and without */
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/* that table gprof cannot process the counts. Possibly gprof should read */
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/* in the .bb and .bbg files generated for gcov processing, but that does */
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/* not happen at the moment. */
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/* */
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/* So for now gmon.out does not contain basic block counts and gprof */
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/* operations that depend on it, e.g. --annotated-source, won't work. */
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#endif /* gmon_out_h */
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