[llvm] [MC,ELF] Emit warning if a string constant contains newline char. (PR #98060)

[Dmitriy Chestnykh via llvm-commits]

================
@@ -0,0 +1,64 @@
+// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s 2>&1 -o %t | FileCheck --strict-whitespace %s --check-prefix=CHECK-WARN
+
+.string "abcd\xFFefg
+12345678"
+
+.ascii "some test ascii
+
+sequence
+with
+newlines\x0A
+"
+
+.asciz "another test string
+
+with
+newline characters
+
+
+"
+
+// CHECK-WARN:        warn-newline-in-string-constant.s:3:21: warning: unterminated string; newline inserted
+// CHECK-WARN:  .string "abcd\xFFefg
+
+// CHECK-WARN:   warn-newline-in-string-constant.s:6:24: warning: unterminated string; newline inserted
+// CHECK-WARN:  .ascii "some test ascii
+// CHECK-WARN:                         ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:7:1: warning: unterminated string; newline inserted
+// CHECK-WARN:   ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:8:9: warning: unterminated string; newline inserted
+// CHECK-WARN:   sequence
+// CHECK-WARN:           ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:9:5: warning: unterminated string; newline inserted
+// CHECK-WARN:   with
+// CHECK-WARN:        ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:10:13: warning: unterminated string; newline inserted
+// CHECK-WARN:   newlines\x0A
+// CHECK-WARN:           ^
+
+// CHECK-WATN:   warn-newline-in-string-constant.s:13:28: warning: unterminated string; newline inserted
+// CHECK-WARN:   .asciz "another test string
+// CHECK-WARN:   warn-newline-in-string-constant.s:14:1: warning: unterminated string; newline inserted
+// CHECK-WARN:   ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:15:5: warning: unterminated string; newline inserted
+// CHECK-WARN:   with
+// CHECK-WARN:        ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:16:19: warning: unterminated string; newline inserted
+// CHECK-WARN:   newline characters
+// CHECK-WARN:                      ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:17:1: warning: unterminated string; newline inserted
+// CHECK-WARN:   ^
+// CHECK-WARN:   warn-newline-in-string-constant.s:18:1: warning: unterminated string; newline inserted
+// CHECK-WARN:   ^
+
+.ascii "test\nstring\xFF\n\n\xFF"
+
+// CHECK-WARN-NOT: warn-newline-in-string-constant.s:55{{.*}}
+
+.asciz "\n\n\ntest_string\x0A"
+
+// CHECK-WARN-NOT: warn-newline-in-string-constant.s:59{{.*}}
+
+.string "1234\n\xFF\n\xFF\n"
+
+// CHECK-WARN-NOT: warn-newline-in-string-constant.s:63{{.*}}
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chestnykh wrote:

Done

https://github.com/llvm/llvm-project/pull/98060