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Add reference to valgrind docs

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Andrew Noyes 2020-03-03 13:40:25 -08:00
parent 32cd90cf05
commit 9a87a19fc8
1 changed files with 7 additions and 0 deletions
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7
flow/Arena.cpp
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@ -20,6 +20,8 @@
#include "Arena.h"
// See https://dox.ipxe.org/memcheck_8h_source.html and https://dox.ipxe.org/valgrind_8h_source.html for an explanation
// of valgrind client requests
#ifdef USE_VALGRIND
#include <memcheck.h>
#else
@ -28,6 +30,11 @@
#define VALGRIND_MAKE_MEM_UNDEFINED(addr, size) ((void)(addr), (void)(size))
#endif
// For each use of arena-internal memory (e.g. ArenaBlock::getSize()), unpoison the memory before use and
// poison it when done.
// When creating a new ArenaBlock, poison the memory that will be later allocated to users.
// When allocating memory to a user, mark that memory as undefined.
namespace {
void unpoison(ArenaBlock* b) {
if (b) {