[llvm] [llvm-mc] Propagate invalid-token errors from byteArrayFromString (PR #217265)

[via llvm-commits]

https://github.com/StevenYangCC created https://github.com/llvm/llvm-project/pull/217265

byteArrayFromString always returned false after skipping an invalid non-hex token, so llvm-mc exited 0 despite printing errors. Track whether an error occurred so the process status matches.

>From 7b052baaa436714a2f3df923d38998356dc0307c Mon Sep 17 00:00:00 2001
From: "chengcang.yang" <yangchengcang at gmail.com>
Date: Wed, 19 Aug 2026 18:23:24 +0800
Subject: [PATCH] [llvm-mc] Propagate invalid-token errors from
 byteArrayFromString

byteArrayFromString always returned false after skipping an invalid
non-hex token, so llvm-mc exited 0 despite printing errors. Track
whether an error occurred so the process status matches.
---
 llvm/tools/llvm-mc/Disassembler.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/tools/llvm-mc/Disassembler.cpp b/llvm/tools/llvm-mc/Disassembler.cpp
index ba6e79d0b7016..2a97ef1ae4db4 100644
--- a/llvm/tools/llvm-mc/Disassembler.cpp
+++ b/llvm/tools/llvm-mc/Disassembler.cpp
@@ -116,6 +116,7 @@ static bool SkipToToken(StringRef &Str) {
 
 static bool byteArrayFromString(ByteArrayTy &ByteArray, StringRef &Str,
                                 SourceMgr &SM, bool HexBytes) {
+  bool ErrorOccurred = false;
   while (SkipToToken(Str)) {
     // Handled by higher level
     if (Str[0] == '[' || Str[0] == ']')
@@ -151,6 +152,7 @@ static bool byteArrayFromString(ByteArrayTy &ByteArray, StringRef &Str,
       Str = Str.substr(Str.find('\n'));
       ByteArray.first.clear();
       ByteArray.second.clear();
+      ErrorOccurred = true;
       continue;
     }
 
@@ -159,7 +161,7 @@ static bool byteArrayFromString(ByteArrayTy &ByteArray, StringRef &Str,
     Str = Str.substr(Next);
   }
 
-  return false;
+  return ErrorOccurred;
 }
 
 int Disassembler::disassemble(const Target &T, MCSubtargetInfo &STI,