Refactor profiling code

haversine_02/src/profiler/timer.c

@@ -1,9 +1,29 @@
 #include "profiler/timer.h"
 #include "aliases.h"
+#include <stdio.h>
+#include <string.h>
 #include <time.h>
 
 #include <x86intrin.h>
 
+#define MAX_PROFILE_SAMPLES 1024
+
+typedef struct {
+  const char *title;
+  u64 duration;
+} profiler_sample_t;
+
+typedef struct {
+  profiler_sample_t samples[MAX_PROFILE_SAMPLES];
+  u64 cpu_freq;
+  u64 size;
+  u64 start;
+  u64 end;
+  u64 max_title_length;
+} profiler_t;
+
+INTERNAL profiler_t profiler = {0};
+
 typedef struct timespec timespec_t;
 
 u64 get_os_frequency() { return 1000000000; }
@@ -44,3 +64,63 @@ u64 get_cpu_freq(u64 milliseconds) {
 
   return cpu_freq;
 }
+
+void profile_start() {
+  profiler.cpu_freq = get_cpu_freq(500);
+  profiler.start = read_cpu_timer();
+  profiler.max_title_length = 0;
+}
+
+void profile_end() {
+  if (!profiler.start || !profiler.size) {
+    return;
+  }
+
+  profiler.end = read_cpu_timer();
+
+  u64 total = profiler.end - profiler.start;
+
+  u16 time_precision = 16;
+  u16 time_char_count = 20;
+  u16 duration_char_count = 22;
+  u16 percentage_precision = 8;
+  u16 percentage_char_count = 12;
+
+  // clang-format off
+  printf("\n==============================PROFILING==============================\n");
+  // clang-format on
+
+  if (profiler.cpu_freq) {
+    printf("Total: %*.*f seconds (CPU frequency: %llu hz/sec)\n\n",
+           time_char_count, time_precision, (f64)total / profiler.cpu_freq,
+           (unsigned long long)profiler.cpu_freq);
+  }
+
+  profiler_sample_t *sample = NULL;
+
+  for (u64 i = 0; i < profiler.size; ++i) {
+    sample = &(profiler.samples[i]);
+
+    printf("%*s: %*lld (%*.*f %%)\n", (i32)profiler.max_title_length,
+           sample->title, duration_char_count,
+           (unsigned long long)sample->duration, percentage_char_count,
+           percentage_precision, (f64)sample->duration / total * 100.0);
+  }
+}
+
+void add_sample(const char *title, u64 duration) {
+  if (profiler.size == MAX_PROFILE_SAMPLES) {
+    return;
+  }
+
+  u64 length = strlen(title);
+
+  if (length > profiler.max_title_length) {
+    profiler.max_title_length = length;
+  }
+
+  profiler.samples[(profiler.size)++] = (profiler_sample_t){
+      .title = title,
+      .duration = duration,
+  };
+}