new.cpp: add sized operator delete.
clang-19 and later default to C++14 sized deallocation. Currently we don't have C23's C equivalent of free_sized(), so we just implement these in terms of free() for now.
Bug: http://b/344993254
Change-Id: I708710aee3f7a684bfe494a96f7baed014acbe57
diff --git a/libc/bionic/new.cpp b/libc/bionic/new.cpp
index c9ce163..5a6acc0 100644
--- a/libc/bionic/new.cpp
+++ b/libc/bionic/new.cpp
@@ -16,13 +16,14 @@
#include <new>
-#include <errno.h>
#include <stdlib.h>
#include <async_safe/log.h>
__attribute__((weak)) const std::nothrow_t std::nothrow = {};
+// We can't throw in bionic, so we go straight to the equivalent of
+// std::terminate for these two instead.
void* operator new(std::size_t size) {
void* p = malloc(size);
if (p == nullptr) {
@@ -30,7 +31,6 @@
}
return p;
}
-
void* operator new[](std::size_t size) {
void* p = malloc(size);
if (p == nullptr) {
@@ -39,26 +39,21 @@
return p;
}
-void operator delete(void* ptr) throw() {
- free(ptr);
-}
-
-void operator delete[](void* ptr) throw() {
- free(ptr);
-}
-
+// These two are the "nothrow" variants, so we just return nullptr on failure.
void* operator new(std::size_t size, const std::nothrow_t&) {
return malloc(size);
}
-
void* operator new[](std::size_t size, const std::nothrow_t&) {
return malloc(size);
}
-void operator delete(void* ptr, const std::nothrow_t&) throw() {
- free(ptr);
-}
+// free() can't throw anyway (except on heap corruption, which is always fatal),
+// so there's no difference between the regular and "nothrow" variants here.
+void operator delete(void* p) noexcept { free(p); }
+void operator delete[](void* p) noexcept { free(p); }
+void operator delete(void* p, const std::nothrow_t&) noexcept { free(p); }
+void operator delete[](void* p, const std::nothrow_t&) noexcept { free(p); }
-void operator delete[](void* ptr, const std::nothrow_t&) throw() {
- free(ptr);
-}
+// TODO: these can use free_sized() once we have it (http://b/284321795).
+void operator delete(void* p, std::size_t) noexcept { free(p); }
+void operator delete[](void* p, std::size_t) noexcept { free(p); }