[llvm] [llvm-bolt] Modify `getLibPath` to enable `--runtime-instrumentation-lib` option handle full path correctly.(llvm#99772) (PR #99806)

[Zimo Ji via llvm-commits]

https://github.com/lltsdyp updated https://github.com/llvm/llvm-project/pull/99806

>From ede137b646939fa78dd454fb961d55678bbea2a9 Mon Sep 17 00:00:00 2001
From: Jizimo <jizimo0430 at outlook.com>
Date: Sun, 21 Jul 2024 17:24:18 +0800
Subject: [PATCH 1/2] [llvm-bolt] Modify `getLibPath` to enable
 `--runtime-instrumentation-lib` option handle full path correctly.

---
 bolt/lib/RuntimeLibs/RuntimeLibrary.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp b/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp
index 276b034d71f96..0826847ee1189 100644
--- a/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp
+++ b/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp
@@ -28,6 +28,12 @@ void RuntimeLibrary::anchor() {}
 
 std::string RuntimeLibrary::getLibPath(StringRef ToolPath,
                                        StringRef LibFileName) {
+  // Handle full path.
+  // It is weird that append LibFileName to LibPath when user gives a full path.
+  if(LibFileName[0]=='/')
+  {
+    return LibFileName.str();
+  }
   StringRef Dir = llvm::sys::path::parent_path(ToolPath);
   SmallString<128> LibPath = llvm::sys::path::parent_path(Dir);
   llvm::sys::path::append(LibPath, "lib" LLVM_LIBDIR_SUFFIX);

>From 0abdfd5d5ffc4d94bbf4418002b22f11d6e89af8 Mon Sep 17 00:00:00 2001
From: Jizimo <jizimo0430 at outlook.com>
Date: Sun, 21 Jul 2024 20:14:54 +0800
Subject: [PATCH 2/2] Add an error handler in my previous commit

In my previous commit, I forget to add an error ha
ndler when given full path.
---
 bolt/lib/RuntimeLibs/RuntimeLibrary.cpp | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp b/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp
index 0826847ee1189..f1a086867a299 100644
--- a/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp
+++ b/bolt/lib/RuntimeLibs/RuntimeLibrary.cpp
@@ -30,20 +30,20 @@ std::string RuntimeLibrary::getLibPath(StringRef ToolPath,
                                        StringRef LibFileName) {
   // Handle full path.
   // It is weird that append LibFileName to LibPath when user gives a full path.
-  if(LibFileName[0]=='/')
-  {
-    return LibFileName.str();
-  }
-  StringRef Dir = llvm::sys::path::parent_path(ToolPath);
-  SmallString<128> LibPath = llvm::sys::path::parent_path(Dir);
-  llvm::sys::path::append(LibPath, "lib" LLVM_LIBDIR_SUFFIX);
-  if (!llvm::sys::fs::exists(LibPath)) {
-    // In some cases we install bolt binary into one level deeper in bin/,
-    // we need to go back one more level to find lib directory.
-    LibPath = llvm::sys::path::parent_path(llvm::sys::path::parent_path(Dir));
+  if (LibFileName[0] == '/') {
+    LibPath = LibFileName;
+  } else {
+    StringRef Dir = llvm::sys::path::parent_path(ToolPath);
+    SmallString<128> LibPath = llvm::sys::path::parent_path(Dir);
     llvm::sys::path::append(LibPath, "lib" LLVM_LIBDIR_SUFFIX);
+    if (!llvm::sys::fs::exists(LibPath)) {
+      // In some cases we install bolt binary into one level deeper in bin/,
+      // we need to go back one more level to find lib directory.
+      LibPath = llvm::sys::path::parent_path(llvm::sys::path::parent_path(Dir));
+      llvm::sys::path::append(LibPath, "lib" LLVM_LIBDIR_SUFFIX);
+    }
+    llvm::sys::path::append(LibPath, LibFileName);
   }
-  llvm::sys::path::append(LibPath, LibFileName);
   if (!llvm::sys::fs::exists(LibPath)) {
     errs() << "BOLT-ERROR: library not found: " << LibPath << "\n";
     exit(1);