Autogenerate boilerplate code for expressions from a single tool

.github/workflows/ci.yml

@@ -33,6 +33,8 @@ jobs:
         ./scripts/clang-tidy-diff.sh
     - name: gen-s-parser
       run: ./scripts/gen-s-parser.py | diff src/gen-s-parser.inc -
+    - name: gen-exprs
+      run: ./scripts/gen-exprs.py && git diff --exit-code src/
 
   build:
     name: build

CMakeLists.txt

@@ -291,6 +291,13 @@ IF(BUILD_LLVM_DWARF)
   SET(binaryen_objs ${binaryen_objs} $<TARGET_OBJECTS:llvm_dwarf>)
 ENDIF()
 
+# Code generation.
+
+add_custom_target(gen_exprs ALL
+  COMMAND ${PROJECT_SOURCE_DIR}/scripts/gen-exprs
+  BYPRODUCTS src/wasm-expressions.generated.h src/ir/compare-expressions.generated.h
+)
+
 # Sources.
 
 file(GLOB binaryen_HEADERS src/*.h)
@@ -310,6 +317,7 @@ install(TARGETS binaryen
   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+add_dependencies(binaryen gen_exprs)
 
 install(FILES src/binaryen-c.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
@@ -321,6 +329,7 @@ function(binaryen_add_executable name sources)
   set_property(TARGET ${name} PROPERTY CXX_STANDARD_REQUIRED ON)
   binaryen_setup_rpath(${name})
   install(TARGETS ${name} DESTINATION ${CMAKE_INSTALL_BINDIR})
+  add_dependencies(${name} gen_exprs)
 endfunction()
 
 binaryen_add_executable(wasm-opt src/tools/wasm-opt.cpp)
@@ -363,6 +372,7 @@ if(EMSCRIPTEN)
   set_property(TARGET binaryen_wasm PROPERTY CXX_STANDARD ${CXX_STANDARD})
   set_property(TARGET binaryen_wasm PROPERTY CXX_STANDARD_REQUIRED ON)
   install(TARGETS binaryen_wasm DESTINATION ${CMAKE_INSTALL_BINDIR})
+  add_dependencies(binaryen_wasm gen_exprs)
 
   # binaryen.js JavaScript variant
   add_executable(binaryen_js
@@ -388,4 +398,5 @@ if(EMSCRIPTEN)
   set_property(TARGET binaryen_js PROPERTY CXX_STANDARD ${CXX_STANDARD})
   set_property(TARGET binaryen_js PROPERTY CXX_STANDARD_REQUIRED ON)
   install(TARGETS binaryen_js DESTINATION ${CMAKE_INSTALL_BINDIR})
+  add_dependencies(binaryen_js gen_exprs)
 endif()

scripts/gen-exprs

@@ -0,0 +1,35 @@
+#!/bin/sh
+#
+# Copyright 2020 WebAssembly Community Group participants
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Entry point for running gen-exprs.py, which requires python 3.
+#
+
+if [ -z "$PYTHON" ]; then
+  PYTHON=$(which python3 2> /dev/null)
+fi
+
+if [ -z "$PYTHON" ]; then
+  PYTHON=$(which python 2> /dev/null)
+fi
+
+if [ -z "$PYTHON" ]; then
+  echo 'unable to find python in $PATH'
+  exit 1
+fi
+
+DIR=`dirname "$0"`
+
+exec "$PYTHON" "$DIR/gen-exprs.py"

scripts/gen-exprs.bat

@@ -0,0 +1,8 @@
+@echo off
+:: Entry point for running gen-exprs.py on windows systems.
+
+if "%PYTHON%"=="" (
+  set PYTHON=python
+)
+
+"%PYTHON%" "%~dp0\%~n0.py" %*