nitj: introduce compiler to Java code

This commit only introduce a stub and a way to test it.
Code generation will be added in next commits.

Signed-off-by: Alexandre Terrasa <[email protected]>

Author: Morriar

src/compiler/java_compiler.nit

@@ -0,0 +1,56 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# 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.
+
+# Compile Nit code to Java code
+#
+# 3 runtime structures are used to represent Nit instance in Java generated code:
+# * `RTClass` to represent a class, it's super-type table and its VFT
+# * `RTMethod` to reprensent a compiled method definition
+# * `RTVal` to reprensent a Nit instance, the null value or a native value
+#
+# More details are given in the documentation of these 3 classes.
+#
+# TODO Factorize with `abstract_compiler`
+module java_compiler
+
+import rapid_type_analysis
+import frontend
+
+redef class ToolContext
+
+	# Where to output the generated binary
+	var opt_output = new OptionString("Output file", "-o", "--output")
+
+	# Where to output tmp files
+	var opt_compile_dir = new OptionString("Directory used to generate temporary files", "--compile-dir")
+
+	redef init do
+		super
+		option_context.add_option(opt_output, opt_compile_dir)
+	end
+end
+
+redef class ModelBuilder
+
+	# Start the Java compiler
+	fun run_java_compiler(mainmodule: MModule, runtime_type_analysis: RapidTypeAnalysis) do
+		var time0 = get_time
+		toolcontext.info("*** GENERATING JAVA ***", 1)
+
+		toolcontext.info("NOT YET IMPLEMENTED", 0)
+
+		var time1 = get_time
+		toolcontext.info("*** END GENERATING JAVA: {time1-time0} ***", 2)
+	end
+end

src/nitj.nit

@@ -0,0 +1,59 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# 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.
+
+# Compile Nit into Java code runnable on the Java Virtual Machine.
+module nitj
+
+import compiler::java_compiler
+
+# Create a tool context to handle options and paths
+var toolcontext = new ToolContext
+toolcontext.process_options(args)
+
+# We need a model to collect stufs
+var model = new Model
+# And a model builder to parse files
+var modelbuilder = new ModelBuilder(model, toolcontext)
+
+# Collect arguments
+var arguments = toolcontext.option_context.rest
+if arguments.is_empty then
+	toolcontext.option_context.usage
+	return
+end
+if arguments.length > 1 then
+	print "Too much arguments: {arguments.join(" ")}"
+	toolcontext.option_context.usage
+	return
+end
+var progname = arguments.first
+
+# Here we load an process all modules passed on the command line
+var mmodules = modelbuilder.parse([progname])
+
+if mmodules.is_empty then return
+modelbuilder.run_phases
+
+var mainmodule
+if mmodules.length == 1 then
+	mainmodule = mmodules.first
+else
+	mainmodule = new MModule(model, null, mmodules.first.name, mmodules.first.location)
+	mainmodule.set_imported_mmodules(mmodules)
+end
+
+var analysis = modelbuilder.do_rapid_type_analysis(mainmodule)
+
+# Do compilation
+modelbuilder.run_java_compiler(mainmodule, analysis)

tests/tests.sh

@@ -470,6 +470,12 @@ case $engine in
 		OPT="--vm $OPT"
 		savdirs="sav/niti/"
 		;;
+	nitj)
+		engine=nitj;
+		OPT="--compile-dir $compdir"
+		enginebinname=nitj;
+		savdirs="sav/nitc-common/"
+		;;
 	emscripten)
 		enginebinname=nitc
 		OPT="-m emscripten_nodejs.nit --semi-global $OPT --compile-dir $compdir"