[compiler-rt] [compiler-rt] Simplify and rename of operator_new_size_type (PR #83912)

[Alexander Richardson via llvm-commits]

https://github.com/arichardson created https://github.com/llvm/llvm-project/pull/83912

We can rely on the compiler-provided macro __SIZE_TYPE__ for all
non-MSVC compilers and fall back to `uptr` otherwise.
I verified via https://godbolt.org/z/MW9KMjv5f that this works for MSVC
as well as GCC 4.5 Clang 3.0, so that should cover supported compilers.

While touching this also rename operator_new_size_type to usize which
makes it more obvious that this is the equivalent to size_t within
the sanitizers runtime (which I plan to use in follow-up changes).


>From 3abf0a0c6a9895312fd43a618d4a3cc5244ada78 Mon Sep 17 00:00:00 2001
From: Alex Richardson <alexrichardson at google.com>
Date: Mon, 4 Mar 2024 13:48:51 -0800
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
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Created using spr 1.3.6-beta.1
---
 compiler-rt/lib/sanitizer_common/sanitizer_common.h   |  2 +-
 .../lib/sanitizer_common/sanitizer_internal_defs.h    | 11 +++--------
 .../lib/sanitizer_common/sanitizer_placement_new.h    |  2 +-
 3 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.h b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
index 47697ef280aa0d..c451fc962c5294 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -1098,7 +1098,7 @@ inline u32 GetNumberOfCPUsCached() {
 
 }  // namespace __sanitizer
 
-inline void *operator new(__sanitizer::operator_new_size_type size,
+inline void *operator new(__sanitizer::usize size,
                           __sanitizer::LowLevelAllocator &alloc) {
   return alloc.Allocate(size);
 }
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h b/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
index 992721757e88da..294e330c4d5611 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
@@ -191,15 +191,10 @@ typedef uptr OFF_T;
 #endif
 typedef u64  OFF64_T;
 
-#if (SANITIZER_WORDSIZE == 64) || SANITIZER_APPLE
-typedef uptr operator_new_size_type;
+#ifdef __SIZE_TYPE__
+typedef __SIZE_TYPE__ usize;
 #else
-# if defined(__s390__) && !defined(__s390x__)
-// Special case: 31-bit s390 has unsigned long as size_t.
-typedef unsigned long operator_new_size_type;
-# else
-typedef u32 operator_new_size_type;
-# endif
+typedef uptr usize;
 #endif
 
 typedef u64 tid_t;
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h b/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h
index 1ceb8b909268f3..11ebcae6b3f912 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h
@@ -17,7 +17,7 @@
 
 #include "sanitizer_internal_defs.h"
 
-inline void *operator new(__sanitizer::operator_new_size_type sz, void *p) {
+inline void *operator new(__sanitizer::usize sz, void *p) {
   return p;
 }