[compiler-rt] implement GetRSS for fuchsia.

[devnexen]

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[llvmbot]

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: David CARLIER (devnexen)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/108649.diff

1 Files Affected:

• (modified) compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp (+6-1)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp
index a67b2a8725eca8..e0d44260749497 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp
@@ -526,7 +526,12 @@ bool GetRandom(void *buffer, uptr length, bool blocking) {
 
 u32 GetNumberOfCPUs() { return zx_system_get_num_cpus(); }
 
-uptr GetRSS() { UNIMPLEMENTED(); }
+uptr GetRSS() {
+  zx_info_task_stats_t i;
+  if (_zx_object_get_info(_zx_process_self(), ZX_INFO_TASK_STATS, &i, sizeof(i), nullptr, nullptr) != ZX_OK)
+    return 0;
+  return i.mem_private_bytes + i.mem_shared_bytes;
+}
 
 void *internal_start_thread(void *(*func)(void *arg), void *arg) { return 0; }
 void internal_join_thread(void *th) {}

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