MDEV-38753: Debugging help: print which MEM_ROOT the object is on #4615
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spetrunia
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DaveGosselin-MariaDB
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DaveGosselin-MariaDB
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Mostly cosmetic but a couple of nontrivial suggestions.
| #ifndef DBUG_OFF | ||
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| /* Check if ptr points to memory on the mem_root */ | ||
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Consider removing this blank line to have the function immediately follow the comment (consistent with dbug_which_mem_root below)
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I thought most functions actually do the reverse - have a blank line between the comment and function.
Do I change it in dbug_which_mem_root instead?
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Whichever way, only be consistent.
sql/sql_test.cc
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| bool dbug_is_mem_on_mem_root(const MEM_ROOT *mem_root, void *ptr) | ||
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| const USED_MEM *ptrs[]={mem_root->free, mem_root->used}; |
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As I understand, there can be no MEM_ROOT covering address 0x0, so consider adding a shortcut here when ptr is NULL:
if (!ptr)
return false;
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No MEM_ROOT covers the NULL pointer, but the current code already handles it:
(gdb) p dbug_is_mem_on_mem_root(thd->mem_root, 0)
$1 = false
We are in debugger, performance is not a concern... why add shortcuts?
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It's your choice, I said only "consider" 😊
Add two functions intended for use from debugger: bool dbug_is_mem_on_mem_root(MEM_ROOT *mem_root, void *ptr); const char *dbug_which_mem_root(THD *thd, void *ptr); Also, collect declarations of all other functions intended for use from debugger in sql/sql_test.h
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Add two functions intended for use from debugger:
bool dbug_is_mem_on_mem_root(MEM_ROOT *mem_root, void *ptr);
const char *dbug_which_mem_root(THD *thd, void *ptr);
Also, collect declarations of all other functions intended for use from debugger in sql/sql_debug.h