PR23872 Integrated assembler error message when using .type directive with @ in AArch32 assembly

[enefaim]

Summary

In AArch32 assembler the @ is a comment symbol, so the error message shouldn't suggest
that '@<type>' is a valid replacement when assembling AArch32.

[richard.barton.arm]

Hi Gabor

This patch LGTM - I think we should commit it.

Thanks
Rich

[richard.barton.arm]

Are there any other targets that we should test it on?

[enefaim]

Hi Richard,

In D10651#193792, @richard.barton.arm wrote:

Are there any other targets that we should test it on?

I don't know about any other target that uses the @ sign as comment
symbol besides ARM.

Thanks,
Gabor

[richard.barton.arm]

Wont the definition getAllowAtInIdentifier tell you?

[enefaim]

New in this version:

• Added more test targets that use @ as comment symbol.

[richard.barton.arm]

LGTM

llvm/trunk/lib/MC/MCParser/ELFAsmParser.cpp

bool ELFAsmParser::ParseDirectiveType(StringRef, SMLoc) {
   // optional in the first case, however, GAS will silently treat the comma as
   // optional in all cases.  Furthermore, although the documentation states that
   // the first form only accepts STT_<TYPE_IN_UPPER_CASE>, in reality, GAS
   // accepts both the upper case name as well as the lower case aliases.
   if (getLexer().is(AsmToken::Comma))
     Lex();
 
   if (getLexer().isNot(AsmToken::Identifier) &&
-      getLexer().isNot(AsmToken::Hash) && getLexer().isNot(AsmToken::At) &&
-      getLexer().isNot(AsmToken::Percent) && getLexer().isNot(AsmToken::String))
+      getLexer().isNot(AsmToken::Hash) &&
+      getLexer().isNot(AsmToken::Percent) &&
+      getLexer().isNot(AsmToken::String)) {
+    if (!getLexer().getAllowAtInIdentifier())
+      return TokError("expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', "
+                      "'%<type>' or \"<type>\"");
+    else if (getLexer().isNot(AsmToken::At))
       return TokError("expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', '@<type>', "
                       "'%<type>' or \"<type>\"");
+  }
 
   if (getLexer().isNot(AsmToken::String) &&
       getLexer().isNot(AsmToken::Identifier))
     Lex();
 
   SMLoc TypeLoc = getLexer().getLoc();
 
   StringRef Type;

llvm/trunk/test/MC/ELF/gnu-type-diagnostics.s

 // RUN: not llvm-mc -triple i686-elf -filetype asm -o /dev/null %s 2>&1 | FileCheck %s
+// RUN: not llvm-mc -triple aarch64-elf -filetype asm -o /dev/null %s 2>&1 | FileCheck %s
+// RUN: not llvm-mc -triple arm-elf -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple armeb-elf -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple thumb-elf -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple thumbeb-elf -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple arm-coff -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple armeb-coff -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple thumb-coff -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple thumbeb-coff -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple arm-apple -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple armeb-apple -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple thumb-apple -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
+// RUN: not llvm-mc -triple thumbeb-apple -filetype asm -o /dev/null %s 2>&1 \
+// RUN:     | FileCheck -check-prefix=CHECK-INVALID-AT-IN-TYPE-DIRECTIVE %s
 
   .type TYPE FUNC
 // CHECK: error: unsupported attribute in '.type' directive
 // CHECK: .type TYPE FUNC
 // CHECK:            ^
 
   .type type stt_func
 // CHECK: error: unsupported attribute in '.type' directive
 // CHECK: .type type stt_func
 // CHECK:            ^
 
   .type symbol 32
 // CHECK: error: expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', '@<type>', '%<type>' or "<type>"
 // CHECK: .type symbol 32
 // CHECK:              ^
 
+// CHECK-INVALID-AT-IN-TYPE-DIRECTIVE: error: expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', '%<type>' or "<type>"
+// CHECK-INVALID-AT-IN-TYPE-DIRECTIVE: .type symbol 32
+// CHECK-INVALID-AT-IN-TYPE-DIRECTIVE:              ^