[llvm] [Attributor] Improve debug string of `AAUnderlyingObjects` (PR #101861)

[Shilei Tian via llvm-commits]

https://github.com/shiltian created https://github.com/llvm/llvm-project/pull/101861

None

>From a48752fd3c24eb21afa01e06558a6acc96c2eaa4 Mon Sep 17 00:00:00 2001
From: Shilei Tian <i at tianshilei.me>
Date: Sat, 3 Aug 2024 20:56:06 -0400
Subject: [PATCH] [Attributor] Improve debug string of `AAUnderlyingObjects`

---
 .../Transforms/IPO/AttributorAttributes.cpp   | 26 +++++++++++++------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
index cd31c4be1c1da..77026c6aa5b27 100644
--- a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -11874,14 +11874,24 @@ struct AAUnderlyingObjectsImpl
 
   /// See AbstractAttribute::getAsStr().
   const std::string getAsStr(Attributor *A) const override {
-    return std::string("UnderlyingObjects ") +
-           (isValidState()
-                ? (std::string("inter #") +
-                   std::to_string(InterAssumedUnderlyingObjects.size()) +
-                   " objs" + std::string(", intra #") +
-                   std::to_string(IntraAssumedUnderlyingObjects.size()) +
-                   " objs")
-                : "<invalid>");
+    if (!isValidState())
+      return "<invalid>";
+    std::string Str;
+    llvm::raw_string_ostream OS(Str);
+    OS << "underlying objects: inter " << InterAssumedUnderlyingObjects.size()
+       << " objects, intra " << IntraAssumedUnderlyingObjects.size()
+       << " objects.\n";
+    if (!InterAssumedUnderlyingObjects.empty()) {
+      OS << "inter objects:\n";
+      for (auto *Obj : InterAssumedUnderlyingObjects)
+        OS << *Obj << '\n';
+    }
+    if (!IntraAssumedUnderlyingObjects.empty()) {
+      OS << "intra objects:\n";
+      for (auto *Obj : IntraAssumedUnderlyingObjects)
+        OS << *Obj << '\n';
+    }
+    return Str;
   }
 
   /// See AbstractAttribute::trackStatistics()