[LIBCLC] Generate FunctionDecl to remangle substituted entries

Author: jchlanda

libclc/cmake/modules/AddLibclc.cmake

@@ -108,6 +108,9 @@ macro(add_libclc_builtin_set arch_suffix)
 
   # Generate remangled variants if requested
   if( LIBCLC_GENERATE_REMANGLED_VARIANTS )
+    set(dummy_in "${CMAKE_BINARY_DIR}/lib/clc/libclc_dummy_in.cc")
+    add_custom_command( OUTPUT ${dummy_in}
+      COMMAND ${CMAKE_COMMAND} -E touch ${dummy_in} )
     set(long_widths l32 l64)
     set(char_signedness signed unsigned)
     # All permutations of [l32, l64] and [signed, unsigned]
@@ -121,10 +124,11 @@ macro(add_libclc_builtin_set arch_suffix)
           -o "${builtins_remangle_path}"
           --long-width=${long_width}
           --char-signedness=${signedness}
-          "$<TARGET_PROPERTY:prepare-${obj_suffix},TARGET_FILE>"
+          --input-ir="$<TARGET_PROPERTY:prepare-${obj_suffix},TARGET_FILE>"
+          ${dummy_in}
           DEPENDS "${builtins_obj_path}" "prepare-${obj_suffix}" libclc-remangler )
         add_custom_target( "remangled-${long_width}-${signedness}_char.${obj_suffix}" ALL
-          DEPENDS "${builtins_remangle_path}" )
+          DEPENDS "${builtins_remangle_path}" "${dummy_in}")
         set_target_properties("remangled-${long_width}-${signedness}_char.${obj_suffix}"
           PROPERTIES TARGET_FILE "${builtins_remangle_path}")
 

libclc/test/CMakeLists.txt

@@ -43,3 +43,27 @@ foreach( t ${LIBCLC_TARGET_TO_TEST} )
 
   endforeach( d )
 endforeach( t )
+
+if(LIBCLC_GENERATE_REMANGLED_VARIANTS)
+  # Run remangler in test mode if generating remangled variants and make sure
+  # it depends on check-libclc target.
+  # Both `long_widths` and `char_signedness` are set in AddLibclc.cmake and can
+  # be used here.
+  foreach(long_width ${long_widths})
+    foreach(signedness ${char_signedness})
+      # In `-t` (TestRun) the remangler does not perform any substitutions, it
+      # needs to make sure that the remangled name matches the original mangled
+      # one.
+      set (test_target_name "test-remangled-${long_width}-${signedness}_char")
+      add_custom_target(${test_target_name}
+        COMMAND libclc-remangler
+        --long-width=${long_width}
+        --char-signedness=${signedness}
+        --input-ir="$<TARGET_PROPERTY:prepare-${obj_suffix},TARGET_FILE>"
+        ${dummy_in} -t -o -
+        DEPENDS "${builtins_obj_path}" "prepare-${obj_suffix}" "${dummy_in}" libclc-remangler)
+
+      add_dependencies(check-libclc ${test_target_name})
+    endforeach()
+  endforeach()
+endif()

libclc/utils/libclc-remangler/CMakeLists.txt

@@ -14,4 +14,11 @@ target_include_directories(libclc-remangler PRIVATE
   ${CMAKE_SOURCE_DIR}/../clang/include
   ${CMAKE_BINARY_DIR}/tools/clang/include)
 
-clang_target_link_libraries(libclc-remangler PRIVATE clangBasic)
+clang_target_link_libraries(libclc-remangler
+  PRIVATE
+  clangAST
+  clangBasic
+  clangFrontend
+  clangTooling
+  LLVMOption
+  )