91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
//---
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// libprof: A manual profiling library for gint
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//---
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#ifndef LIBPROF_LIBPROF
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#define LIBPROF_LIBPROF
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#include <stdint.h>
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#include <gint/defs/attributes.h>
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//---
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// Initialization
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//---
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/* prof_init(): Initialize the profiler's timer
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Starts a timer to count time. libprof automatically selects a TMU and tries
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to use TMU2 before TMU1 before TMU0 so that high-priority interrupts remain
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available, and sets an accurate clock configuration.
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Returns non-zero if no timer is available. */
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int prof_init(void);
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/* prof_quit(): Free the profiler's timer */
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void prof_quit(void);
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//---
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// Runtime time measurement
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//---
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/* Context object, has an elasped delay and a recursion level. This object can
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be created on the stack of a function that measures its execution time,
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except if the function is recursive, in which case it should be either
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static or global. */
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typedef struct prof_t
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{
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uint32_t rec;
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uint32_t elapsed;
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} GPACKED(4) prof_t;
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/* prof_make(): Create a new context object
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A context can be cleared by assigning it prof_make() again. */
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#define prof_make() ((prof_t){ 0, 0 })
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/* Timer counter */
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extern uint32_t volatile *prof_tcnt;
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/* prof_enter(): Start counting time for a function
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This macro should be called at the start of the context scope. If the
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function was already executing then the deepest instance in the stack is
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used instead of creating a new counter. */
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#define prof_enter(prof) { \
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if(!prof.rec++) prof.elapsed += *prof_tcnt; \
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}
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/* prof_leave(): Stop counting time for a function
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This should be called at the end of the context scope; it only actually
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stops if there is no deeper instance of the context in the stack. If there
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are not as exactly as many prof_leave()'s as prof_enter()'s then the
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resulting time measure will not be relevant at all. */
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#define prof_leave(prof) { \
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if(!--prof.rec) prof.elapsed -= *prof_tcnt; \
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}
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/* prof_exec(): Measure a single block of code
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This operation can be used when profiling is not required, and instead
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libprof is used to measure the performance of a single bit of code. Use it
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like this:
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uint32_t elasped_us = prof_exec({
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exec_code();
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}); */
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#define prof_exec(code) ({ \
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prof_t prof = prof_make(); \
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prof_enter(prof); \
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code; \
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prof_leave(prof); \
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prof_time(prof); \
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})
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//---
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// Post-measurement analysis
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//---
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/* prof_time(): Time spent in a given context, in microseconds
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Should only be called when the context is not currently executing. */
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uint32_t prof_time(prof_t prof);
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#endif /* LIBPROF_LIBPROF */
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