[llvm] [symbolizer] Address starting with a plus sign is valid. (PR #135857)

[Ebuka Ezike via llvm-commits]

https://github.com/da-viper created https://github.com/llvm/llvm-project/pull/135857

this is also the same behaviour in `gnu addr2line`.

depends on #135856

>From 4eec5d8b8725612fc4ab7936a1e18ad343c9ff1c Mon Sep 17 00:00:00 2001
From: Ebuka Ezike <yerimyah1 at gmail.com>
Date: Tue, 15 Apr 2025 16:52:24 +0100
Subject: [PATCH] [symbolizer] Address starting with a plus sign is valid.

this is also the same behaviour in gnu addr2line.

Signed-off-by: Ebuka Ezike <yerimyah1 at gmail.com>
---
 llvm/test/tools/llvm-symbolizer/symbol-search.test | 5 +++--
 llvm/tools/llvm-symbolizer/llvm-symbolizer.cpp     | 9 ++++++---
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/llvm/test/tools/llvm-symbolizer/symbol-search.test b/llvm/test/tools/llvm-symbolizer/symbol-search.test
index 6729c4b01bfef..fe9a61bd8ef6c 100644
--- a/llvm/test/tools/llvm-symbolizer/symbol-search.test
+++ b/llvm/test/tools/llvm-symbolizer/symbol-search.test
@@ -65,8 +65,9 @@ RUN: llvm-symbolizer --obj=%p/Inputs/symbols.so func_01+0A | FileCheck --check-p
 RUN: llvm-addr2line --obj=%p/Inputs/symbols.so func_01+0A | FileCheck --check-prefix=NONEXISTENT %s
 
 # If '+' is not preceded by a symbol, it is part of a symbol name, not an offset separator.
-RUN: llvm-symbolizer --obj=%p/Inputs/symbols.so +0x1138 | FileCheck --check-prefix=NONEXISTENT %s
-RUN: llvm-addr2line --obj=%p/Inputs/symbols.so +0x1138 | FileCheck --check-prefix=NONEXISTENT %s
+# address starting with a `+` sign is a valid address
+RUN: llvm-symbolizer --obj=%p/Inputs/symbols.so +0x1138 | FileCheck --check-prefix=CODE-CMD %s
+RUN: llvm-addr2line --obj=%p/Inputs/symbols.so +0x1138 | FileCheck --check-prefix=CODE-CMD %s
 
 # Show that C++ mangled names may be specified.
 RUN: llvm-addr2line --obj=%p/Inputs/symbols.so _ZL14static_func_01i | FileCheck --check-prefix=MULTI-CXX %s
diff --git a/llvm/tools/llvm-symbolizer/llvm-symbolizer.cpp b/llvm/tools/llvm-symbolizer/llvm-symbolizer.cpp
index 3ba7f59d5b847..c8abddbbab5dd 100644
--- a/llvm/tools/llvm-symbolizer/llvm-symbolizer.cpp
+++ b/llvm/tools/llvm-symbolizer/llvm-symbolizer.cpp
@@ -238,9 +238,12 @@ static Error parseCommand(StringRef BinaryName, bool IsAddr2Line,
   bool StartsWithDigit = std::isdigit(AddrSpec.front());
 
   // GNU addr2line assumes the address is hexadecimal and allows a redundant
-  // "0x" or "0X" prefix; do the same for compatibility.
-  if (IsAddr2Line)
-    AddrSpec.consume_front("0x") || AddrSpec.consume_front("0X");
+  // "0x" or "0X" prefix or with an optional `+` sign; do the same for
+  // compatibility.
+  if (IsAddr2Line) {
+    AddrSpec.consume_front_insensitive("0x") ||
+        AddrSpec.consume_front_insensitive("+0x");
+  }
 
   // If address specification is a number, treat it as a module offset.
   if (!AddrSpec.getAsInteger(IsAddr2Line ? 16 : 0, Offset)) {