[compiler-rt] [scudo] Add `__scudo_get_info` symbol to export stats to a buffer. (PR #130273)

[via llvm-commits]

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@@ -37,4 +37,16 @@ scudo::Allocator<scudo::Config, SCUDO_PREFIX(malloc_postinit)> SCUDO_ALLOCATOR;
 
 extern "C" INTERFACE void __scudo_print_stats(void) { Allocator.printStats(); }
 
+extern "C" INTERFACE size_t __scudo_get_info(uint32_t topic, void *buffer,
+                                             size_t size) {
+  switch (topic) {
+  case M_INFO_TOPIC_STATS:
+    return Allocator.getStats(reinterpret_cast<char *>(buffer), size);
+  case M_INFO_TOPIC_FRAGMENTATION:
+    return Allocator.getFragmentationInfo(reinterpret_cast<char *>(buffer),
+                                          size);
+  }
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ChiaHungDuan wrote:

do you want a default case here and below?

https://github.com/llvm/llvm-project/pull/130273