[clang] [clang] Use StringRef in range-based for loops (NFC) (PR #144242)

[Kazu Hirata via cfe-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/144242

When we iterate over std::vector<std::string>, we can directly assign
each element to StringRef.  We do not need to go through separate
statements.


>From e5e1102d5d936347be78421c9bb244a0e2bb54d8 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Fri, 13 Jun 2025 13:22:43 -0700
Subject: [PATCH] [clang] Use StringRef in range-based for loops (NFC)

When we iterate over std::vector<std::string>, we can directly assign
each element to StringRef.  We do not need to go through separate
statements.
---
 clang/lib/Basic/TargetInfo.cpp           | 3 +--
 clang/lib/Sema/SemaDeclAttr.cpp          | 6 ++----
 clang/lib/Tooling/ArgumentsAdjusters.cpp | 3 +--
 3 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 7b577632fdf55..9429a316a9196 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -555,8 +555,7 @@ void TargetInfo::adjust(DiagnosticsEngine &Diags, LangOptions &Opts) {
 bool TargetInfo::initFeatureMap(
     llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
     const std::vector<std::string> &FeatureVec) const {
-  for (const auto &F : FeatureVec) {
-    StringRef Name = F;
+  for (StringRef Name : FeatureVec) {
     if (Name.empty())
       continue;
     // Apply the feature via the target.
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 9c985e6bd5e03..2e826adf9229f 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -3232,8 +3232,7 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
     if (ParsedAttrs.Duplicate != "")
       return Diag(LiteralLoc, diag::err_duplicate_target_attribute)
              << Duplicate << None << ParsedAttrs.Duplicate << Target;
-    for (const auto &Feature : ParsedAttrs.Features) {
-      StringRef CurFeature = Feature;
+    for (StringRef CurFeature : ParsedAttrs.Features) {
       if (!CurFeature.starts_with('+') && !CurFeature.starts_with('-'))
         return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
                << Unsupported << None << AttrStr << Target;
@@ -3241,8 +3240,7 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
   }
 
   if (Context.getTargetInfo().getTriple().isLoongArch()) {
-    for (const auto &Feature : ParsedAttrs.Features) {
-      StringRef CurFeature = Feature;
+    for (StringRef CurFeature : ParsedAttrs.Features) {
       if (CurFeature.starts_with("!arch=")) {
         StringRef ArchValue = CurFeature.split("=").second.trim();
         return Diag(LiteralLoc, diag::err_attribute_unsupported)
diff --git a/clang/lib/Tooling/ArgumentsAdjusters.cpp b/clang/lib/Tooling/ArgumentsAdjusters.cpp
index d01c57ee69c00..999fa790124cb 100644
--- a/clang/lib/Tooling/ArgumentsAdjusters.cpp
+++ b/clang/lib/Tooling/ArgumentsAdjusters.cpp
@@ -22,8 +22,7 @@ namespace clang {
 namespace tooling {
 
 static StringRef getDriverMode(const CommandLineArguments &Args) {
-  for (const auto &Arg : Args) {
-    StringRef ArgRef = Arg;
+  for (StringRef ArgRef : Args) {
     if (ArgRef.consume_front("--driver-mode=")) {
       return ArgRef;
     }