cinera_handmade.network/cmuratori/hero/code/code346.hmml

[video output=day346 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Consolidating Memory Block Headers" vod_platform=youtube id=XBft9E6NBDU annotator=Miblo]
[0:11][Recap and set the stage for the day]
[1:07][Run the game and assess our current situation]
[3:22][Blackboard: Memory Protection]
[7:08][Consider sharing the memory protection block with the operating system]
[10:10][handmade_platform.h: Introduce platform_memory_block struct which is shared with win32_memory_block]
[12:08][handmade_platform.h: Collapse the memory_block_chain into platform_memory_block]
[15:31][handmade_memory.h: Make PushSize_() use our new platform-provided struct]
[22:29][handmade_memory.h: Make Clear() and FreeLastBlock() operate on this struct]
[24:48][win32_handmade.cpp: Rewrite PLATFORM_ALLOCATE_MEMORY() and PLATFORM_DEALLOCATE_MEMORY() to implement our new shared scheme]
[30:30][Run the game and fix miscellaneous bugs]
[33:08][Run the game to see that we're running okay]
[33:39][win32_handmade.cpp: Enable PLATFORM_ALLOCATE_MEMORY() to perform overflow checking]
[39:57][Blackboard: Checking for any set bits]
[41:35][win32_handmade.cpp: Continue enabling overflow checking]
[43:39][Run the game to see it successfully catch our overflow bug]
[44:18][handmade_world.cpp: Remove that bug, run it again, crash in PushAndNullTerminate() and investigate why]
[46:23][Calculate what we would expect]
[48:17][Step through PushSize_() to see what it's computing]
[52:17][Consider our choices for getting the correct alignment]
[53:57][handmade_memory.h: Enable PushSize_() to compute the size using the alignment]
[54:37][Run the game to find that we are maintaining alignment]
[55:45][handmade_memory.h: Prevent PushSize_() from enabling the bounds checking, run the game and try looped code editing]
[56:19][Investigate what's happening with the SourceBlock.Size][quote 532]
[58:12][win32_handmade.cpp: Make PLATFORM_ALLOCATE_MEMORY() set the PageSize directly to aid our investigations]
[1:01:57][Q&A][:speech]
[1:02:37][@insobot][Bashing Tim Berners-Lee, inventor of the outer loop from 0 to freee everything?]
[1:02:57]["It's kind of like insobot is the beat poet of our generation"][quote 533]
[1:03:51][@pragmascrypt][Maybe set the default alignment to 1 when in memory checking mode?]
[1:04:18][todo.txt: Update the TODO list]
[1:05:03][@danyguag][I know this is a little off-topic to what you are currently doing on stream, but what role does a software driver play if any at all?]
[1:06:56][@danyguag][No, you can make a C++ project that enables you to use resources that you can't use in user mode in the kernel]
[1:10:52][Done][:speech]
[/video]