[WASM] Embed .swiftmodulesummary and .sib in toolchain

Author: kateinoigakukun

cmake/caches/Runtime-WASI-wasm32.cmake

@@ -22,6 +22,7 @@ set(SWIFT_ENABLE_EXPERIMENTAL_CONCURRENCY NO CACHE BOOL "")
 # TODO(katei): This should get turned off, as this is not an ABI stable platform.
 # But current CMake build system doesn't support SWIFT_STDLIB_STABLE_ABI=NO
 set(SWIFT_STDLIB_STABLE_ABI YES CACHE BOOL "")
+set(SWIFT_STDLIB_ENABLE_THINCMO YES CACHE BOOL "")
 
 # build with the host compiler
 set(SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER YES CACHE BOOL "")

stdlib/CMakeLists.txt

@@ -59,6 +59,10 @@ option(SWIFT_ENABLE_MODULE_INTERFACES
        "Generate .swiftinterface files alongside .swiftmodule files"
        "${SWIFT_STDLIB_STABLE_ABI}")
 
+option(SWIFT_STDLIB_ENABLE_THINCMO
+       "Generate .swiftmodulesummary and .sib files alongside .swiftmodule files for thin cross module optimization"
+       FALSE)
+
 option(SWIFT_ENABLE_COMPATIBILITY_OVERRIDES
        "Support back-deploying compatibility fixes for newer apps running on older runtimes."
        TRUE)

stdlib/cmake/modules/SwiftSource.cmake

@@ -806,6 +806,28 @@ function(_compile_swift_files
           ${copy_legacy_layouts_dep}
         COMMENT "Generating ${module_file}")
 
+    set(modulesummary_file "${module_base}.swiftmodulesummary")
+    set(modulesummary_file_static "${module_base_static}.swiftmodulesummary")
+    set(thincmo_sib_file "${module_base}.sib")
+    set(thincmo_sib_file_static "${module_base_static}.sib")
+    if(SWIFT_STDLIB_ENABLE_THINCMO)
+      add_custom_command_target(
+        thincmo_intermediate_target
+        COMMAND
+          "$<TARGET_FILE:Python3::Interpreter>" "${line_directive_tool}" "@${file_path}" --
+          "${swift_compiler_tool}" "-emit-sib" "-o" "${thincmo_sib_file}"
+          ${swift_flags} "-emit-module-summary" "@${file_path}"
+        OUTPUT "${modulesummary_file}" "${thincmo_sib_file}"
+        DEPENDS
+          ${swift_compiler_tool_dep}
+          ${source_files} ${SWIFTFILE_DEPENDS}
+          ${swift_ide_test_dependency}
+          ${create_dirs_dependency_target}
+          ${copy_legacy_layouts_dep}
+          ${module_dependency_target}
+        COMMENT "Generating ${modulesummary_file}")
+    endif()
+
     if(SWIFTFILE_STATIC)
       add_custom_command_target(
         module_dependency_target_static
@@ -823,8 +845,22 @@ function(_compile_swift_files
           "${module_dependency_target}"
         COMMENT "Generating ${module_file}")
       set("${dependency_module_target_out_var_name}" "${module_dependency_target_static}" PARENT_SCOPE)
+
+      if(SWIFT_STDLIB_ENABLE_THINCMO)
+        add_custom_command_target(
+          thincmo_intermediate_target_static
+          COMMAND
+            "${CMAKE_COMMAND}" "-E" "copy" ${modulesummary_file} ${modulesummary_file_static}
+          COMMAND
+            "${CMAKE_COMMAND}" "-E" "copy" ${thincmo_sib_file} ${thincmo_sib_file_static}
+          OUTPUT ${modulesummary_file_static}
+          DEPENDS
+            "${thincmo_intermediate_target}" "${module_dependency_target_static}"
+          COMMENT "Generating ${modulesummary_file_static}")
+        set("${dependency_module_target_out_var_name}" "${module_dependency_target_static}" "${thincmo_intermediate_target_static}" PARENT_SCOPE)
+      endif()
     else()
-      set("${dependency_module_target_out_var_name}" "${module_dependency_target}" PARENT_SCOPE)
+      set("${dependency_module_target_out_var_name}" "${module_dependency_target}" "${thincmo_intermediate_target}" PARENT_SCOPE)
     endif()
 
     # macCatalyst zippered swiftmodule