[compiler-rt] [compiler-rt][lsan][Fuchsia] Adjust lsan allocator settings (PR #69401)

[via llvm-commits]

https://github.com/PiJoules updated https://github.com/llvm/llvm-project/pull/69401

>From 503cc1985b4299a360a9f44a5c7804f10e8b0b1e Mon Sep 17 00:00:00 2001
From: Leonard Chan <leonardchan at google.com>
Date: Wed, 18 Oct 2023 00:19:10 +0000
Subject: [PATCH] [compiler-rt][lsan][Fuchsia] Adjust lsan allocator settings

These now match the settings for the asan allocator on Fuchsia+RISCV.
---
 compiler-rt/lib/lsan/lsan_allocator.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/compiler-rt/lib/lsan/lsan_allocator.h b/compiler-rt/lib/lsan/lsan_allocator.h
index 7197e0a736298fb..5eed0cbdb309bbd 100644
--- a/compiler-rt/lib/lsan/lsan_allocator.h
+++ b/compiler-rt/lib/lsan/lsan_allocator.h
@@ -68,8 +68,23 @@ using PrimaryAllocator = PrimaryAllocatorASVT<LocalAddressSpaceView>;
 #else
 # if SANITIZER_FUCHSIA || defined(__powerpc64__)
 const uptr kAllocatorSpace = ~(uptr)0;
+#    if SANITIZER_RISCV64
+// See the comments in compiler-rt/lib/asan/asan_allocator.h for why these
+// values were chosen.
+const uptr kAllocatorSize = UINT64_C(1) << 33;  // 8GB
+using LSanSizeClassMap = SizeClassMap</*kNumBits=*/2,
+                                      /*kMinSizeLog=*/5,
+                                      /*kMidSizeLog=*/8,
+                                      /*kMaxSizeLog=*/18,
+                                      /*kNumCachedHintT=*/8,
+                                      /*kMaxBytesCachedLog=*/10>;
+static_assert(LSanSizeClassMap::kNumClassesRounded <= 32,
+              "32 size classes is the optimal number to ensure tests run "
+              "effieciently on Fuchsia.");
+#    else
 const uptr kAllocatorSize  =  0x40000000000ULL;  // 4T.
 using LSanSizeClassMap = DefaultSizeClassMap;
+#    endif
 #  elif SANITIZER_RISCV64
 const uptr kAllocatorSpace = ~(uptr)0;
 const uptr kAllocatorSize = 0x2000000000ULL;  // 128G.