[Clang][Driver] Fix `--save-temps` for OpenCL AoT compilation (#78333)

We can directly call `clang -c -x cl -target amdgcn -mcpu=gfx90a test.cl
-o test.o`
to compile an OpenCL kernel file. However, when `--save-temps` is
enabled, it doesn't
work because the preprocessed file (`.i` file) is taken as C source file
when it
is fed to the front end, thus causing compilation error because those
OpenCL keywords
can't be recognized. This patch fixes the issue.

3 files changed, 26 insertions, 3 deletions

diff --git a/clang/include/clang/Driver/Types.def b/clang/include/clang/Driver/Types.def
index b889883125c4..f72c27e1ee70 100644
--- a/clang/include/clang/Driver/Types.def
+++ b/clang/include/clang/Driver/Types.def
@@ -37,8 +37,10 @@
 // C family source language (with and without preprocessing).
 TYPE("cpp-output",               PP_C,         INVALID,         "i",      phases::Compile, phases::Backend, phases::Assemble, phases::Link)
 TYPE("c",                        C,            PP_C,            "c",      phases::Preprocess, phases::Compile, phases::Backend, phases::Assemble, phases::Link)
-TYPE("cl",                       CL,           PP_C,            "cl",     phases::Preprocess, phases::Compile, phases::Backend, phases::Assemble, phases::Link)
-TYPE("clcpp",                    CLCXX,        PP_CXX,          "clcpp",  phases::Preprocess, phases::Compile, phases::Backend, phases::Assemble, phases::Link)
+TYPE("cl",                       CL,           PP_CL,           "cl",     phases::Preprocess, phases::Compile, phases::Backend, phases::Assemble, phases::Link)
+TYPE("cl-cpp-output",            PP_CL,        INVALID,         "cli",    phases::Compile, phases::Backend, phases::Assemble, phases::Link)
+TYPE("clcpp",                    CLCXX,        PP_CLCXX,        "clcpp",  phases::Preprocess, phases::Compile, phases::Backend, phases::Assemble, phases::Link)
+TYPE("clcpp-cpp-output",         PP_CLCXX,     INVALID,         "clii",   phases::Compile, phases::Backend, phases::Assemble, phases::Link)
 TYPE("cuda-cpp-output",          PP_CUDA,      INVALID,         "cui",    phases::Compile, phases::Backend, phases::Assemble, phases::Link)
 TYPE("cuda",                     CUDA,         PP_CUDA,         "cu",     phases::Preprocess, phases::Compile, phases::Backend, phases::Assemble, phases::Link)
 TYPE("cuda",                     CUDA_DEVICE,  PP_CUDA,         "cu",     phases::Preprocess, phases::Compile, phases::Backend, phases::Assemble, phases::Link)
diff --git a/clang/lib/Driver/Types.cpp b/clang/lib/Driver/Types.cpp
index 08df34ade7b6..a7b6b9000e1d 100644
--- a/clang/lib/Driver/Types.cpp
+++ b/clang/lib/Driver/Types.cpp
@@ -133,7 +133,7 @@ bool types::isAcceptedByClang(ID Id) {
 
   case TY_Asm:
   case TY_C: case TY_PP_C:
-  case TY_CL: case TY_CLCXX:
+  case TY_CL: case TY_PP_CL: case TY_CLCXX: case TY_PP_CLCXX:
   case TY_CUDA: case TY_PP_CUDA:
   case TY_CUDA_DEVICE:
   case TY_HIP:
@@ -181,7 +181,9 @@ bool types::isDerivedFromC(ID Id) {
   case TY_PP_C:
   case TY_C:
   case TY_CL:
+  case TY_PP_CL:
   case TY_CLCXX:
+  case TY_PP_CLCXX:
   case TY_PP_CUDA:
   case TY_CUDA:
   case TY_CUDA_DEVICE:
@@ -241,6 +243,7 @@ bool types::isCXX(ID Id) {
   case TY_PP_CXXHeaderUnit:
   case TY_ObjCXXHeader: case TY_PP_ObjCXXHeader:
   case TY_CXXModule: case TY_PP_CXXModule:
+  case TY_PP_CLCXX:
   case TY_CUDA: case TY_PP_CUDA: case TY_CUDA_DEVICE:
   case TY_HIP:
   case TY_PP_HIP:
@@ -310,7 +313,9 @@ types::ID types::lookupTypeForExtension(llvm::StringRef Ext) {
       .Case("cc", TY_CXX)
       .Case("CC", TY_CXX)
       .Case("cl", TY_CL)
+      .Case("cli", TY_PP_CL)
       .Case("clcpp", TY_CLCXX)
+      .Case("clii", TY_PP_CLCXX)
       .Case("cp", TY_CXX)
       .Case("cu", TY_CUDA)
       .Case("hh", TY_CXXHeader)
diff --git a/clang/test/Driver/opencl_aot_save_temps.cl b/clang/test/Driver/opencl_aot_save_temps.cl
new file mode 100644
index 000000000000..7b3149871f8f
--- /dev/null
+++ b/clang/test/Driver/opencl_aot_save_temps.cl
@@ -0,0 +1,16 @@
+// RUN: %clang -x cl --save-temps -c -### %s 2>&1 | FileCheck %s
+// RUN: %clang -x cl -ccc-print-phases -c %s 2>&1 | FileCheck %s -check-prefix=CHECK-PHASES
+
+// CHECK: "-o" "[[CLI_NAME:.+]].cli" "-x" "cl"
+// CHECK-NEXT:  "-o" "[[CLI_NAME]].bc" "-x" "cl-cpp-output"{{.*}}"[[CLI_NAME:.+]].cli"
+
+// CHECK-PHASES: 0: input, {{.*}}, cl
+// CHECK-PHASES: 1: preprocessor, {0}, cl-cpp-output
+// CHECK-PHASES: 2: compiler, {1}, ir
+
+uint3 add(uint3 a, uint3 b) {
+  ulong x = a.x + (ulong)b.x;
+  ulong y = a.y + (ulong)b.y + (x >> 32);
+  uint z = a.z + b.z + (y >> 32);
+  return (uint3)(x, y, z);
+}