DavidSpickett added a comment.
@ychen Since this change the warning emitted in `AsmPrinterInlineAsm.cpp` about
reserved registers no longer has location information for the file that the
inline asm is in. Here's an example:
void bar(void)
{
__asm__ __volatile__ ( "nop" : : : "sp");
}
./bin/clang --target=arm-arm-none-eabi -march=armv7-m -c /tmp/test.c -o
/dev/null
Before:
/tmp/test.c:3:28: warning: inline asm clobber list contains reserved
registers: SP [-Winline-asm]
__asm__ __volatile__ ( "nop" : : : "sp");
^
<inline asm>:1:1: note: instantiated into assembly here
nop
^
/tmp/test.c:3:28: note: Reserved registers on the clobber list may not be
preserved across the asm statement, and clobbering them may lead to undefined
behaviour.
__asm__ __volatile__ ( "nop" : : : "sp");
^
<inline asm>:1:1: note: instantiated into assembly here
nop
^
1 warning generated.
After:
<inline asm>:1:1: warning: inline asm clobber list contains reserved
registers: SP
nop
^^^^^^^^
<inline asm>:1:1: note: Reserved registers on the clobber list may not be
preserved across the asm statement, and clobbering them may lead to undefined
behaviour.
nop
^^^^^^^^
(the reason it didn't break any tests is that we only check this message from
IR and only look for the "contains reserved registers" line)
Can you guide me on how I might correct this?
My current impression is that since this code does `SrcMgr.PrintMessage(Loc,
SourceMgr::DK_Warning, Msg)` it's one level too deep to get source information
added to it automatically. And that if this code could use `DK_InlineAsm` that
would help. However getting hold of the Diagnostic manager from MCContext isn't
possible currently, perhaps that is by design?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D97449/new/
https://reviews.llvm.org/D97449
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