[swift] Add Swift support to LLDB for WebAssembly

Author: kateinoigakukun

.gitmodules

@@ -4,11 +4,11 @@
 	gclient-condition = build_with_chromium == False
 [submodule "extensions/cxx_debugging/third_party/llvm/src"]
 	path = extensions/cxx_debugging/third_party/llvm/src
-	url = https://chromium.googlesource.com/external/github.com/llvm/llvm-project
+	url = https://github.com/kateinoigakukun/llvm-project.git
 	gclient-condition = checkout_cxx_debugging_extension_deps == True
 [submodule "extensions/cxx_debugging/third_party/lldb-eval/src"]
 	path = extensions/cxx_debugging/third_party/lldb-eval/src
-	url = https://chromium.googlesource.com/external/github.com/google/lldb-eval
+	url = https://github.com/kateinoigakukun/lldb-eval.git
 	gclient-condition = checkout_cxx_debugging_extension_deps == True
 [submodule "buildtools"]
 	path = buildtools
@@ -26,3 +26,6 @@
 	path = third_party/inspector_protocol
 	url = https://chromium.googlesource.com/deps/inspector_protocol
 	gclient-condition = build_with_chromium == False
+[submodule "extensions/cxx_debugging/third_party/swift/src"]
+	path = extensions/cxx_debugging/third_party/swift/src
+	url = https://github.com/kateinoigakukun/swift.git

extensions/cxx_debugging/CMakeLists.txt

@@ -81,9 +81,20 @@ endif()
 if (CXX_DEBUGGING_BUILD_WASM)
   set(LLVM_ENABLE_RTTI "ON" CACHE STRING "")
   set(LLVM_ENABLE_THREADS "OFF" CACHE STRING "")
+  set(LLVM_ENABLE_LIBEDIT "OFF" CACHE STRING "")
+
+  set(LLVM_EXTERNAL_SWIFT_SOURCE_DIR "${THIRD_PARTY_DIR}/swift/src" CACHE STRING "")
+  set(LLVM_EXTERNAL_PROJECTS "swift" CACHE STRING "")
+  set(SWIFT_ENABLE_DISPATCH "OFF" CACHE STRING "")
+  set(SWIFT_BUILD_SOURCEKIT "OFF" CACHE STRING "")
+  set(SWIFT_HOST_VARIANT_SDK "EMSCRIPTEN" CACHE STRING "")
+  set(SWIFT_HOST_VARIANT_ARCH "wasm32" CACHE STRING "")
+  set(SWIFT_INCLUDE_TESTS "OFF" CACHE STRING "")
+  add_compile_options(-fdeclspec)
 else()
   set(LLVM_ON_WIN32 0)
   set(LLVM_ON_UNIX 1)
+  set(LLDB_ENABLE_SWIFT_SUPPORT "OFF" CACHE STRING "")
 endif()
 
 

extensions/cxx_debugging/ports/cmark-gfm-config.cmake

@@ -0,0 +1,5 @@
+set(cmark-gfm_FOUND TRUE)
+set(cmark-gfm_INCLUDE_DIRS "${CMAKE_CURRENT_LIST_DIR}/include")
+set(cmark-gfm_LIBRARIES)
+
+add_library(libcmark-gfm INTERFACE) 

extensions/cxx_debugging/src/SymbolsBackend.cc

@@ -12,6 +12,8 @@
 #include "WasmVendorPlugins.h"
 
 #include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
+#include "Plugins/Language/Swift/SwiftLanguage.h"
+#include "Plugins/TypeSystem/Swift/TypeSystemSwiftTypeRef.h"
 #include "Plugins/ObjectFile/wasm/ObjectFileWasm.h"
 #include "Plugins/ScriptInterpreter/None/ScriptInterpreterNone.h"
 #include "Plugins/SymbolFile/DWARF/SymbolFileDWARF.h"
@@ -33,6 +35,8 @@ struct DefaultPluginsContext
                             lldb_private::FileSystem,
                             lldb_private::CPlusPlusLanguage,
                             lldb_private::TypeSystemClang,
+                            lldb_private::SwiftLanguage,
+                            lldb_private::TypeSystemSwiftTypeRef,
                             lldb_private::wasm::ObjectFileWasm,
                             lldb_private::wasm::SymbolVendorWasm,
                             symbols_backend::WasmProcess,

extensions/cxx_debugging/src/SymbolsBackend.cc.in

@@ -12,6 +12,8 @@
 #include "WasmVendorPlugins.h"
 
 #include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
+#include "Plugins/Language/Swift/SwiftLanguage.h"
+#include "Plugins/TypeSystem/Swift/TypeSystemSwiftTypeRef.h"
 #include "Plugins/ObjectFile/wasm/ObjectFileWasm.h"
 #include "Plugins/ScriptInterpreter/None/ScriptInterpreterNone.h"
 #include "Plugins/SymbolFile/DWARF/SymbolFileDWARF.h"
@@ -33,6 +35,8 @@ struct DefaultPluginsContext
                             lldb_private::FileSystem,
                             lldb_private::CPlusPlusLanguage,
                             lldb_private::TypeSystemClang,
+                            lldb_private::SwiftLanguage,
+                            lldb_private::TypeSystemSwiftTypeRef,
                             lldb_private::wasm::ObjectFileWasm,
                             lldb_private::wasm::SymbolVendorWasm,
                             symbols_backend::WasmProcess,

extensions/cxx_debugging/third_party/llvm/src

@@ -0,0 +1 @@
+file://config/owner/INFRA_OWNERS

extensions/cxx_debugging/third_party/swift/OWNERS

@@ -0,0 +1,13 @@
+Name: The Swift Programming Language
+Short Name: swift
+URL: https://github.com/swiftlang/swift
+Version: N/A
+Date: TODO
+Revision: TODO
+License: Apache 2.0 with LLVM Exceptions
+License File: src/LICENSE.TXT
+Shipped: no
+Security Critical: no
+Description: The Swift project produces a compiler, standard library, and other tools for developing software in the Swift programming language. In order to achieve ABI stability and debuggability, programs produced by the Swift compiler contain type layout information in its own metadata sections instead of the standard DWARF format. This metadata is used by both the Swift runtime and LLDB to inspect objects at runtime.
+
+In the DevTools debugging extension, a part of the Swift project is used to read such metadata through LLDB's Swift language plugin.

extensions/cxx_debugging/third_party/swift/README.chromium

@@ -123,12 +123,17 @@ def stage2(source_dir, stage1_dir, OPTIONS):
     }
     cmake_args = [
         OPTIONS.cmake, OPTIONS.extension_source, *CMAKE_DEFAULTS,
+        # ABI check must be turned off when building with -DNDEBUG
+        '-DLLVM_ABI_BREAKING_CHECKS=FORCE_OFF',
         '-DCMAKE_CXX_FLAGS_RELWITHDEBINFO=-O1 -g -DNDEBUG',
         '-DCMAKE_C_FLAGS_RELWITHDEBINFO=-O1 -g -DNDEBUG',
         '-DCMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO=-O1 -g -DNDEBUG -gseparate-dwarf',
         '-DCMAKE_CXX_FLAGS_DEBUG=-O0 -g -DNDEBUG',
         '-DCMAKE_EXE_LINKER_FLAGS_DEBUG=-O0 -g -gseparate-dwarf',
+        '-DCMAKE_EXE_LINKER_FLAGS=-sERROR_ON_UNDEFINED_SYMBOLS=0',
         '-DHAVE_POSIX_REGEX=0', '-Derrc_exit_code=0',
+        '-DHAVE_SIGALTSTACK=0',
+        '-Dcmark-gfm_DIR={}'.format(os.path.join(source_dir, 'ports')),
         '-Derrc_exit_code__TRYRUN_OUTPUT=0',
         '-DCMAKE_BUILD_TYPE={build_type}'.format(**cmake_settings),
         '-DCMAKE_TOOLCHAIN_FILE={toolchain_file}'.format(**cmake_settings),