[Lldb-commits] [lldb] [LLDB][NFCI] Use resize_for_overwrite in VASprintf (PR #197405)

[Felipe de Azevedo Piovezan via lldb-commits]

https://github.com/felipepiovezan created https://github.com/llvm/llvm-project/pull/197405

This code path is particularly hot when logs are enabled.

>From 65a4ea3fbb076b06b30f05c16a92a70aa332d17b Mon Sep 17 00:00:00 2001
From: Felipe de Azevedo Piovezan <fpiovezan at apple.com>
Date: Wed, 13 May 2026 08:48:41 +0100
Subject: [PATCH] [LLDB][NFCI] Use resize_for_overwrite in VASprintf

This code path is particularly hot when logs are enabled.
---
 lldb/source/Utility/VASprintf.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lldb/source/Utility/VASprintf.cpp b/lldb/source/Utility/VASprintf.cpp
index 5d361edf06e6c..ca3f953428b90 100644
--- a/lldb/source/Utility/VASprintf.cpp
+++ b/lldb/source/Utility/VASprintf.cpp
@@ -25,7 +25,7 @@ bool lldb_private::VASprintf(llvm::SmallVectorImpl<char> &buf, const char *fmt,
   va_list copy_args;
   va_copy(copy_args, args);
 
-  buf.resize(buf.capacity());
+  buf.resize_for_overwrite(buf.capacity());
   // Write up to `capacity` bytes, ignoring the current size.
   int length = ::vsnprintf(buf.data(), buf.size(), fmt, args);
   if (length < 0) {
@@ -37,7 +37,7 @@ bool lldb_private::VASprintf(llvm::SmallVectorImpl<char> &buf, const char *fmt,
   if (size_t(length) >= buf.size()) {
     // The error formatted string didn't fit into our buffer, resize it to the
     // exact needed size, and retry
-    buf.resize(length + 1);
+    buf.resize_for_overwrite(length + 1);
     length = ::vsnprintf(buf.data(), buf.size(), fmt, copy_args);
     if (length < 0) {
       buf = error;