Encode/decode AST into metadata, re-instantiate inlined items

src/etc/gen-astencode

@@ -0,0 +1,57 @@
+#!/bin/sh
+
+M=src/comp/metadata
+GEN_TYPES="syntax::ast::item syntax::ast::def middle::typeck::method_origin \
+           middle::freevars::freevar_entry syntax::ast::def_id"
+
+# Find serializer tool:
+for S in build/*/stage2/bin/serializer; do
+
+    # Find rustc:
+    D=$(dirname "$S")
+    R="${D}/rustc"
+    if [ ! -x "$R" ]; then
+        echo "rustc not found or not executable at path '$R'"
+        exit 1
+    fi
+
+    echo "Generating src/comp/metadata/astencode_gen.rs"
+
+    # First, generate dummy fns so that the compiler can type
+    # everything.
+    echo "// TEMPORARY DEFINITIONS: re-run gen-astencode" \
+        > $M/astencode_gen.rs
+    for T in $GEN_TYPES; do
+      echo "fn serialize_${T//::/_}<S>(_s: S, _v: $T) {}" \
+          >> $M/astencode_gen.rs
+      echo "fn deserialize_${T//::/_}<S>(_s: S) -> $T { fail; }" \
+          >> $M/astencode_gen.rs
+    done
+
+    # Generate the real code into a temporary file.
+    if ! "$S" src/comp/rustc.rc $GEN_TYPES > tmp.$$.rs
+    then
+        echo ""
+        echo ""
+        echo "****************************************"
+        echo "* Compilation errors encountered       *"
+        echo "*                                      *"
+        echo "* Dummy versions of the AST encoder    *"
+        echo "* have been left in astencode_gen.rs.  *"
+        echo "* Fix the compilation errors and rerun *"
+        echo "* this script to generate the real     *"
+        echo "* versions.                            *"
+        echo "****************************************"
+        rm tmp.$$.rs
+        exit 1
+    fi
+
+    # Copy over into the final destination and clean up.
+    "$R" --pretty normal tmp.$$.rs > $M/astencode_gen.rs
+    # rm -f tmp.$$.rs
+    exit 0
+done
+
+# If we made it this far, must not have found any
+# serializer:
+echo "serializer tool not found."

src/etc/tidy.py

@@ -18,8 +18,11 @@ def report_err(s):
     print("%s:%d: %s" % (fileinput.filename(), fileinput.filelineno(), s))
     err=1
 
+file_names = [s for s in sys.argv[1:] if not s.endswith("_gen.rs")]
+
 try:
-    for line in fileinput.input(openhook=fileinput.hook_encoded("utf-8")):
+    for line in fileinput.input(file_names,
+                                openhook=fileinput.hook_encoded("utf-8")):
         if (line.find('\t') != -1 and
             fileinput.filename().find("Makefile") == -1):
             report_err("tab character")