add 2-pass compile support, to support scala macro

entrypoint.rb

@@ -17,14 +17,31 @@
 end
 
 # -------------- split scala src & jar
-scala_src = []
-jar_src = []
-filelist_src = []
+src_list = []
+cp_list = []
+
+psrc_list = [] # src need precompile
+
+opt_list = []
+
+def is_valid_src(s)
+  s.end_with?(".scala") || s.end_with?(".java") || s.start_with?("@")
+end
 
 srcs.each do |s|
-  scala_src << s if s.end_with?(".scala")
-  jar_src   << s if s.end_with?(".jar")
-  filelist_src << s if s.start_with?("@")
+  if s.start_with?("+")
+    s1 = s.sub(/^\+/, '')
+    psrc_list << s1 if is_valid_src(s1)
+  elsif is_valid_src(s)
+    src_list << s
+  elsif s.end_with?(".jar")
+    cp_list << s
+  else
+    # we assume no option:
+    # 1. start with '+'
+    # 2. start with '@', end with '.scala', '.java' or '.jar'no option:
+    opt_list << s
+  end
 end
 
 # ------------- compile
@@ -35,15 +52,28 @@
 
 chisel3_jar.delete(plugin_jar)
 
-classpath = chisel3_jar.join(':')
+classpath = (chisel3_jar + cp_list).join(':')
 
 target_dir = Dir.mktmpdir("chisel2verilog")
 at_exit { FileUtils.remove_entry(target_dir) }
 
-compile_cmd = ["scalac", "-cp", classpath, "-Xplugin:#{plugin_jar}",
-               "-d", target_dir] + scala_src + filelist_src
+# do precompile if necessary
+unless psrc_list.empty?
+  precompile_cmd = ["scalac", "-cp", classpath, "-Xplugin:#{plugin_jar}",
+                    "-d", target_dir] + opt_list + psrc_list
 
+  #pp precompile_cmd
+  system(precompile_cmd.join(" ")) or begin
+    abort "precompile fail"
+  end
+
+  classpath += ":#{target_dir}"
+end
+
+compile_cmd = ["scalac", "-cp", classpath, "-Xplugin:#{plugin_jar}",
+               "-d", target_dir] + opt_list + src_list
 
+#pp compile_cmd
 system(compile_cmd.join(" ")) or begin
   abort "compile fail"
 end