[AArch64] Filter out invalid code model in frontend.

[HsiangKai]

Summary

AArch64 only supports tiny, small, and large code model. Show error
messages when users specify other code model.

Fix https://github.com/llvm/llvm-project/issues/53402

[paquette]

Looks reasonable to me.

[paquette]

clang/test/Driver/mcmodel.c

9

Do you need not in front of this? Can't remember.

[HsiangKai]

Make the test lines consistent.

[HsiangKai]

clang/test/Driver/mcmodel.c

9

I use -### in the test lines. It will not execute commands. I changed them to be consistent with the previous 'invalid' test lines.

clang/lib/Driver/ToolChains/Clang.cpp

#endif
   TC.addClangTargetOptions(Args, CmdArgs, JA.getOffloadingDeviceKind());
 
   if (Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ)) {
     StringRef CM = A->getValue();
     if (CM == "small" || CM == "kernel" || CM == "medium" || CM == "large" ||
         CM == "tiny") {
       if (Triple.isOSAIX() && CM == "medium")
         CmdArgs.push_back("-mcmodel=large");
+      else if (Triple.isAArch64() && (CM == "kernel" || CM == "medium"))
+        D.Diag(diag::err_drv_invalid_argument_to_option)
+            << CM << A->getOption().getName();
       else
         A->render(Args, CmdArgs);
     } else {
       D.Diag(diag::err_drv_invalid_argument_to_option)
           << CM << A->getOption().getName();
     }
   }
 

clang/test/Driver/mcmodel.c

 // RUN: %clang -target x86_64 -### -c -mcmodel=tiny %s 2>&1 | FileCheck --check-prefix=TINY %s
 // RUN: %clang -target x86_64 -### -c -mcmodel=small %s 2>&1 | FileCheck --check-prefix=SMALL %s
 // RUN: %clang -target x86_64 -### -S -mcmodel=kernel %s 2>&1 | FileCheck --check-prefix=KERNEL %s
 // RUN: %clang -target x86_64 -### -c -mcmodel=medium %s 2>&1 | FileCheck --check-prefix=MEDIUM %s
 // RUN: %clang -target x86_64 -### -S -mcmodel=large %s 2>&1 | FileCheck --check-prefix=LARGE %s
 // RUN: %clang -target powerpc-unknown-aix -### -S -mcmodel=medium %s 2> %t.log
 // RUN: FileCheck --check-prefix=AIX-MCMEDIUM-OVERRIDE %s < %t.log
 // RUN: not %clang -c -mcmodel=lager %s 2>&1 | FileCheck --check-prefix=INVALID %s
+// RUN: not %clang -c -target aarch64 -mcmodel=medium %s 2>&1 | FileCheck --check-prefix=AARCH64-MEDIUM %s
+// RUN: not %clang -c -target aarch64 -mcmodel=kernel %s 2>&1 | FileCheck --check-prefix=AARCH64-KERNEL %s
 
 // TINY: "-mcmodel=tiny"
 // SMALL: "-mcmodel=small"
 // KERNEL: "-mcmodel=kernel"
 // MEDIUM: "-mcmodel=medium"
 // LARGE: "-mcmodel=large"
 // AIX-MCMEDIUM-OVERRIDE: "-mcmodel=large"
 
 // INVALID: error: invalid argument 'lager' to -mcmodel=
+
+// AARCH64-MEDIUM: error: invalid argument 'medium' to -mcmodel=
+// AARCH64-KERNEL: error: invalid argument 'kernel' to -mcmodel=