[PATCH] D126719: [clang-cl] Add support for /kernel

[Stephen Long via Phabricator via cfe-commits]

steplong created this revision.
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Herald added a project: clang.

MSVC defines _KERNEL_MODE when /kernel is passed.
Also, /kernel disables RTTI and C++ exception handling.

https://docs.microsoft.com/en-us/cpp/build/reference/kernel-create-kernel-mode-binary?view=msvc-170


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126719

Files:
  clang/include/clang/Basic/LangOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/OSTargets.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/cl-zc.cpp


Index: clang/test/Driver/cl-zc.cpp
===================================================================
--- clang/test/Driver/cl-zc.cpp
+++ clang/test/Driver/cl-zc.cpp
@@ -24,6 +24,9 @@
 // RUN: %clang_cl /c /std:c++17 -### /Zc:alignedNew- -- %s 2>&1 | FileCheck -check-prefix=ALIGNED-NEW-OFF %s
 // ALIGNED-NEW-OFF-NOT: "-faligned-allocation"
 
+// RUN: %clang_cl /c -### /kernel -- %s 2>&1 | FileCheck -check-prefix=KERNEL %s
+// KERNEL: "-fno-rtti"
+
 // RUN: %clang_cl /c -### -- %s 2>&1 | FileCheck -check-prefix=STRICTSTRINGS-DEFAULT %s
 // STRICTSTRINGS-DEFAULT-NOT: -Werror=c++11-compat-deprecated-writable-strings
 // RUN: %clang_cl /c -### /Zc:strictStrings -- %s 2>&1 | FileCheck -check-prefix=STRICTSTRINGS-ON %s
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -7458,6 +7458,13 @@
     EH.NoUnwindC = true;
   }
 
+  if (Args.hasFlag(options::OPT__SLASH_kernel, options::OPT__SLASH_kernel,
+                   false)) {
+    EH.Synch = false;
+    EH.NoUnwindC = false;
+    EH.Asynch = false;
+  }
+
   return EH;
 }
 
@@ -7602,6 +7609,11 @@
    CmdArgs.push_back("-fno-wchar");
  }
 
+ if (Args.hasFlag(options::OPT__SLASH_kernel, options::OPT__SLASH_kernel,
+                  false)) {
+   CmdArgs.push_back("-fno-rtti");
+ }
+
   Arg *MostGeneralArg = Args.getLastArg(options::OPT__SLASH_vmg);
   Arg *BestCaseArg = Args.getLastArg(options::OPT__SLASH_vmb);
   if (MostGeneralArg && BestCaseArg)
@@ -7671,6 +7683,9 @@
     CmdArgs.push_back("msvc");
   }
 
+  if (Args.hasArg(options::OPT__SLASH_kernel))
+    CmdArgs.push_back("-fms-kernel");
+
   if (Arg *A = Args.getLastArg(options::OPT__SLASH_guard)) {
     StringRef GuardArgs = A->getValue();
     // The only valid options are "cf", "cf,nochecks", "cf-", "ehcont" and
Index: clang/lib/Basic/Targets/OSTargets.cpp
===================================================================
--- clang/lib/Basic/Targets/OSTargets.cpp
+++ clang/lib/Basic/Targets/OSTargets.cpp
@@ -215,6 +215,9 @@
     }
   }
 
+  if (Opts.Kernel)
+    Builder.defineMacro("_KERNEL_MODE");
+
   Builder.defineMacro("_INTEGRAL_MAX_BITS", "64");
   Builder.defineMacro("__STDC_NO_THREADS__");
 
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -2178,6 +2178,8 @@
   NormalizedValues<["PPTMK_FullGeneralitySingleInheritance", "PPTMK_FullGeneralityMultipleInheritance",
                     "PPTMK_FullGeneralityVirtualInheritance"]>,
   MarshallingInfoEnum<LangOpts<"MSPointerToMemberRepresentationMethod">, "PPTMK_BestCase">;
+def fms_kernel : Flag<["-"], "fms-kernel">, Group<f_Group>, Flags<[CC1Option, NoDriverOption]>,
+  MarshallingInfoFlag<LangOpts<"Kernel">>;
 // __declspec is enabled by default for the PS4 by the driver, and also
 // enabled for Microsoft Extensions or Borland Extensions, here.
 //
Index: clang/include/clang/Basic/LangOptions.def
===================================================================
--- clang/include/clang/Basic/LangOptions.def
+++ clang/include/clang/Basic/LangOptions.def
@@ -88,6 +88,7 @@
 LANGOPT(C17               , 1, 0, "C17")
 LANGOPT(C2x               , 1, 0, "C2x")
 LANGOPT(MSVCCompat        , 1, 0, "Microsoft Visual C++ full compatibility mode")
+LANGOPT(Kernel            , 1, 0, "Kernel mode")
 LANGOPT(MicrosoftExt      , 1, 0, "Microsoft C++ extensions")
 LANGOPT(AsmBlocks         , 1, 0, "Microsoft inline asm blocks")
 LANGOPT(Borland           , 1, 0, "Borland extensions")


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