[Lldb/Lua] Generate Lua Bindings

This patch uses SWIG to generate the Lua bindings for the SB API. It
covers most of the API, but some methods require a type map similar to
Python.

Discussion on the mailing list:
http://lists.llvm.org/pipermail/lldb-dev/2019-December/015812.html

Differential revision: https://reviews.llvm.org/D71235

2 files changed, 71 insertions, 26 deletions

diff --git a/lldb/scripts/CMakeLists.txt b/lldb/scripts/CMakeLists.txt
index 5b86956f2a9..8fa4e5f7891 100644
--- a/lldb/scripts/CMakeLists.txt
+++ b/lldb/scripts/CMakeLists.txt
@@ -27,31 +27,58 @@ else()
   set(DARWIN_EXTRAS "")
 endif()
 
-add_custom_command(
-  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapPython.cpp
-  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/lldb.py
-  DEPENDS ${SWIG_SOURCES}
-  DEPENDS ${SWIG_INTERFACES}
-  DEPENDS ${SWIG_HEADERS}
-  COMMAND ${SWIG_EXECUTABLE} 
-      -c++
-      -shadow
-      -python
-      -features autodoc
-      -threads
-      -I${LLDB_SOURCE_DIR}/include
-      -I${CMAKE_CURRENT_SOURCE_DIR}
-      -D__STDC_LIMIT_MACROS
-      -D__STDC_CONSTANT_MACROS
-      ${DARWIN_EXTRAS}
-      -outdir ${CMAKE_CURRENT_BINARY_DIR}
-      -o ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapPython.cpp
-      ${LLDB_SOURCE_DIR}/scripts/lldb.swig
-  VERBATIM
-  COMMENT "Builds LLDB Python wrapper")
-
-add_custom_target(swig_wrapper ALL DEPENDS
-  ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapPython.cpp
-  ${CMAKE_CURRENT_BINARY_DIR}/lldb.py
+set(SWIG_COMMON_FLAGS
+  -c++
+  -features autodoc
+  -I${LLDB_SOURCE_DIR}/include
+  -I${CMAKE_CURRENT_SOURCE_DIR}
+  -D__STDC_LIMIT_MACROS
+  -D__STDC_CONSTANT_MACROS
+  ${DARWIN_EXTRAS}
+  -outdir ${CMAKE_CURRENT_BINARY_DIR}
 )
 
+
+if (LLDB_ENABLE_PYTHON)
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapPython.cpp
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/lldb.py
+    DEPENDS ${SWIG_SOURCES}
+    DEPENDS ${SWIG_INTERFACES}
+    DEPENDS ${SWIG_HEADERS}
+    COMMAND ${SWIG_EXECUTABLE}
+        ${SWIG_COMMON_FLAGS}
+        -c++
+        -shadow
+        -python
+        -threads
+        -o ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapPython.cpp
+        ${LLDB_SOURCE_DIR}/scripts/lldb.swig
+    VERBATIM
+    COMMENT "Builds LLDB Python wrapper")
+
+  add_custom_target(swig_wrapper ALL DEPENDS
+    ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapPython.cpp
+    ${CMAKE_CURRENT_BINARY_DIR}/lldb.py
+  )
+endif()
+
+if (LLDB_ENABLE_LUA)
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapLua.cpp
+    DEPENDS ${SWIG_SOURCES}
+    DEPENDS ${SWIG_INTERFACES}
+    DEPENDS ${SWIG_HEADERS}
+    COMMAND ${SWIG_EXECUTABLE}
+        ${SWIG_COMMON_FLAGS}
+        -lua
+        -w503
+        -o ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapLua.cpp
+        ${LLDB_SOURCE_DIR}/scripts/lldb_lua.swig
+    VERBATIM
+    COMMENT "Builds LLDB Lua wrapper")
+
+  add_custom_target(swig_wrapper_lua ALL DEPENDS
+    ${CMAKE_CURRENT_BINARY_DIR}/LLDBWrapLua.cpp
+  )
+endif()
diff --git a/lldb/scripts/lldb_lua.swig b/lldb/scripts/lldb_lua.swig
new file mode 100644
index 00000000000..85edefff76f
--- /dev/null
+++ b/lldb/scripts/lldb_lua.swig
@@ -0,0 +1,18 @@
+/*
+   lldb.swig
+
+   This is the input file for SWIG, to create the appropriate C++ wrappers and
+   functions for various scripting languages, to enable them to call the
+   liblldb Script Bridge functions.
+*/
+
+%module lldb
+
+%include "./headers.swig"
+
+%{
+using namespace lldb_private;
+using namespace lldb;
+%}
+
+%include "./interfaces.swig"