119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/* ========================================================================
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(C) Copyright 2023 by Molly Rocket, Inc., All Rights Reserved.
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Please see https://computerenhance.com for more information
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======================================================================== */
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/* ========================================================================
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LISTING 81
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======================================================================== */
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#include "listing_0074_platform_metrics.cpp"
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struct profile_anchor
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{
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u64 TSCElapsed;
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u64 TSCElapsedChildren;
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u64 HitCount;
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char const *Label;
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};
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struct profiler
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{
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profile_anchor Anchors[4096];
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u64 StartTSC;
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u64 EndTSC;
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};
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static profiler GlobalProfiler;
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static u32 GlobalProfilerParent;
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struct profile_block
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{
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profile_block(char const *Label_, u32 AnchorIndex_)
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{
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ParentIndex = GlobalProfilerParent;
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AnchorIndex = AnchorIndex_;
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Label = Label_;
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GlobalProfilerParent = AnchorIndex;
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StartTSC = ReadCPUTimer();
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}
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~profile_block(void)
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{
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u64 Elapsed = ReadCPUTimer() - StartTSC;
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GlobalProfilerParent = ParentIndex;
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profile_anchor *Parent = GlobalProfiler.Anchors + ParentIndex;
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profile_anchor *Anchor = GlobalProfiler.Anchors + AnchorIndex;
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Parent->TSCElapsedChildren += Elapsed;
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Anchor->TSCElapsed += Elapsed;
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++Anchor->HitCount;
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/* NOTE(casey): This write happens every time solely because there is no
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straightforward way in C++ to have the same ease-of-use. In a better programming
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language, it would be simple to have the anchor points gathered and labeled at compile
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time, and this repetative write would be eliminated. */
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Anchor->Label = Label;
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}
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char const *Label;
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u64 StartTSC;
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u32 ParentIndex;
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u32 AnchorIndex;
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};
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#define NameConcat2(A, B) A##B
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#define NameConcat(A, B) NameConcat2(A, B)
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#define TimeBlock(Name) profile_block NameConcat(Block, __LINE__)(Name, __COUNTER__ + 1);
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#define TimeFunction TimeBlock(__func__)
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static void PrintTimeElapsed(u64 TotalTSCElapsed, profile_anchor *Anchor)
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{
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u64 Elapsed = Anchor->TSCElapsed - Anchor->TSCElapsedChildren;
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f64 Percent = 100.0 * ((f64)Elapsed / (f64)TotalTSCElapsed);
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printf(" %s[%llu]: %llu (%.2f%%", Anchor->Label, Anchor->HitCount, Elapsed, Percent);
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if(Anchor->TSCElapsedChildren)
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{
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f64 PercentWithChildren = 100.0 * ((f64)Anchor->TSCElapsed / (f64)TotalTSCElapsed);
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printf(", %.2f%% w/children", PercentWithChildren);
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}
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printf(")\n");
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}
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static void BeginProfile(void)
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{
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GlobalProfiler.StartTSC = ReadCPUTimer();
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}
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static void EndAndPrintProfile()
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{
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GlobalProfiler.EndTSC = ReadCPUTimer();
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u64 CPUFreq = EstimateCPUTimerFreq();
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u64 TotalCPUElapsed = GlobalProfiler.EndTSC - GlobalProfiler.StartTSC;
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if(CPUFreq)
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{
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printf("\nTotal time: %0.4fms (CPU freq %llu)\n", 1000.0 * (f64)TotalCPUElapsed / (f64)CPUFreq, CPUFreq);
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}
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for(u32 AnchorIndex = 0; AnchorIndex < ArrayCount(GlobalProfiler.Anchors); ++AnchorIndex)
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{
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profile_anchor *Anchor = GlobalProfiler.Anchors + AnchorIndex;
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if(Anchor->TSCElapsed)
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{
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PrintTimeElapsed(TotalCPUElapsed, Anchor);
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}
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}
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}
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