ni_nitdoc: added fast copy past utility to signatures.
[nit.git] / src / separate_compiler.nit
index 17aef78..a2e5128 100644 (file)
@@ -16,7 +16,7 @@
 module separate_compiler
 
 import abstract_compiler
-intrude import coloring
+import layout_builders
 import rapid_type_analysis
 
 # Add separate compiler specific options
@@ -37,8 +37,8 @@ redef class ToolContext
        var opt_phmod_typing: OptionBool = new OptionBool("Replace coloration by perfect hashing (with mod operator)", "--phmod-typing")
        # --use-and-perfect-hashing
        var opt_phand_typing: OptionBool = new OptionBool("Replace coloration by perfect hashing (with and operator)", "--phand-typing")
-       # --generic-resolution-tree
-       var opt_typing_table_metrics: OptionBool = new OptionBool("Enable static size measuring of tables used for typing and resolution", "--typing-table-metrics")
+       # --tables-metrics
+       var opt_tables_metrics: OptionBool = new OptionBool("Enable static size measuring of tables used for vft, typing and resolution", "--tables-metrics")
 
        redef init
        do
@@ -51,7 +51,7 @@ redef class ToolContext
                self.option_context.add_option(self.opt_bm_typing)
                self.option_context.add_option(self.opt_phmod_typing)
                self.option_context.add_option(self.opt_phand_typing)
-               self.option_context.add_option(self.opt_typing_table_metrics)
+               self.option_context.add_option(self.opt_tables_metrics)
        end
 end
 
@@ -59,12 +59,15 @@ redef class ModelBuilder
        fun run_separate_compiler(mainmodule: MModule, runtime_type_analysis: RapidTypeAnalysis)
        do
                var time0 = get_time
-               self.toolcontext.info("*** COMPILING TO C ***", 1)
+               self.toolcontext.info("*** GENERATING C ***", 1)
 
                var compiler = new SeparateCompiler(mainmodule, self, runtime_type_analysis)
                compiler.compile_header
 
                # compile class structures
+               self.toolcontext.info("Property coloring", 2)
+               compiler.new_file("{mainmodule.name}.classes")
+               compiler.do_property_coloring
                for m in mainmodule.in_importation.greaters do
                        for mclass in m.intro_mclasses do
                                compiler.compile_class_to_c(mclass)
@@ -72,17 +75,19 @@ redef class ModelBuilder
                end
 
                # The main function of the C
-               compiler.new_file
+               compiler.new_file("{mainmodule.name}.main")
                compiler.compile_main_function
 
                # compile methods
                for m in mainmodule.in_importation.greaters do
-                       compiler.new_file
+                       self.toolcontext.info("Generate C for module {m}", 2)
+                       compiler.new_file("{m.name}.sep")
                        compiler.compile_module_to_c(m)
                end
 
                # compile live & cast type structures
-               compiler.new_file
+               self.toolcontext.info("Type coloring", 2)
+               compiler.new_file("{mainmodule.name}.types")
                var mtypes = compiler.do_type_coloring
                for t in mtypes do
                        compiler.compile_type_to_c(t)
@@ -90,6 +95,8 @@ redef class ModelBuilder
 
                compiler.display_stats
 
+               var time1 = get_time
+               self.toolcontext.info("*** END GENERATING C: {time1-time0} ***", 2)
                write_and_make(compiler)
        end
 end
@@ -98,64 +105,48 @@ end
 class SeparateCompiler
        super AbstractCompiler
 
-       # Cache for classid
-       protected var classids: HashMap[MClassType, String] = new HashMap[MClassType, String]
-
        # The result of the RTA (used to know live types and methods)
        var runtime_type_analysis: RapidTypeAnalysis
 
        private var undead_types: Set[MType] = new HashSet[MType]
        private var partial_types: Set[MType] = new HashSet[MType]
-       protected var typeids: HashMap[MType, Int] protected writable = new HashMap[MType, Int]
-
-       private var type_colors: Map[MType, Int] = typeids
-       private var type_tables: nullable Map[MType, Array[nullable MType]] = null
-
-       private var live_unanchored_types: Map[MClassDef, Set[MType]] = new HashMap[MClassDef, HashSet[MType]]
-
-       private var unanchored_types_colors: nullable Map[MType, Int]
-       private var unanchored_types_tables: nullable Map[MClassType, Array[nullable MType]]
-       private var unanchored_types_masks: nullable Map[MClassType, Int]
-
-       protected var class_coloring: ClassColoring
-
-       protected var method_colors: Map[MMethod, Int]
-       protected var method_tables: Map[MClass, Array[nullable MMethodDef]]
-
-       protected var attr_colors: Map[MAttribute, Int]
-       protected var attr_tables: Map[MClass, Array[nullable MAttributeDef]]
-
-       protected var vt_colors: Map[MVirtualTypeProp, Int]
-       protected var vt_tables: Map[MClass, Array[nullable MVirtualTypeDef]]
-       protected var vt_masks: nullable Map[MClass, Int]
+       private var live_unresolved_types: Map[MClassDef, Set[MType]] = new HashMap[MClassDef, HashSet[MType]]
 
-       private var ft_colors: nullable Map[MParameterType, Int]
-       private var ft_tables: nullable Map[MClass, Array[nullable MParameterType]]
-       private var ft_masks: nullable Map[MClass, Int]
+       private var type_layout: nullable Layout[MType]
+       private var resolution_layout: nullable Layout[MType]
+       protected var method_layout: nullable Layout[MMethod]
+       protected var attr_layout: nullable Layout[MAttribute]
 
        init(mainmodule: MModule, mmbuilder: ModelBuilder, runtime_type_analysis: RapidTypeAnalysis) do
-               super
-               self.header = new_visitor
+               super(mainmodule, mmbuilder)
+               var file = new_file("nit.common")
+               self.header = new CodeWriter(file)
                self.runtime_type_analysis = runtime_type_analysis
-               self.do_property_coloring
                self.compile_box_kinds
        end
 
        redef fun compile_header_structs do
                self.header.add_decl("typedef void(*nitmethod_t)(void); /* general C type representing a Nit method. */")
                self.compile_header_attribute_structs
-               self.header.add_decl("struct class \{ int box_kind; nitmethod_t vft[1]; \}; /* general C type representing a Nit class. */")
+               self.header.add_decl("struct class \{ int box_kind; nitmethod_t vft[]; \}; /* general C type representing a Nit class. */")
 
-               # With unanchored_table, all live type resolution are stored in a big table: unanchored_table
-               self.header.add_decl("struct type \{ int id; const char *name; int color; short int is_nullable; struct types *unanchored_table; int table_size; int type_table[1]; \}; /* general C type representing a Nit type. */")
+               # With resolution_table_table, all live type resolution are stored in a big table: resolution_table
+               self.header.add_decl("struct type \{ int id; const char *name; int color; short int is_nullable; const struct types *resolution_table; int table_size; int type_table[]; \}; /* general C type representing a Nit type. */")
+               self.header.add_decl("struct instance \{ const struct type *type; const struct class *class; nitattribute_t attrs[]; \}; /* general C type representing a Nit instance. */")
 
                if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       self.header.add_decl("struct types \{ int mask; struct type *types[1]; \}; /* a list types (used for vts, fts and unanchored lists). */")
+                       self.header.add_decl("struct types \{ int mask; const struct type *types[]; \}; /* a list types (used for vts, fts and unresolved lists). */")
                else
-                       self.header.add_decl("struct types \{ struct type *types[1]; \}; /* a list types (used for vts, fts and unanchored lists). */")
+                       self.header.add_decl("struct types \{ int dummy; const struct type *types[]; \}; /* a list types (used for vts, fts and unresolved lists). */")
+               end
+
+               if modelbuilder.toolcontext.opt_phmod_typing.value then
+                       self.header.add_decl("#define HASH(mask, id) ((mask)%(id))")
+               else if modelbuilder.toolcontext.opt_phand_typing.value then
+                       self.header.add_decl("#define HASH(mask, id) ((mask)&(id))")
                end
 
-               self.header.add_decl("typedef struct \{ struct type *type; struct class *class; nitattribute_t attrs[1]; \} val; /* general C type representing a Nit instance. */")
+               self.header.add_decl("typedef struct instance val; /* general C type representing a Nit instance. */")
        end
 
        fun compile_header_attribute_structs
@@ -200,71 +191,151 @@ class SeparateCompiler
        end
 
        fun compile_color_consts(colors: Map[Object, Int]) do
+               var v = new_visitor
                for m, c in colors do
+                       if color_consts_done.has(m) then continue
                        if m isa MProperty then
                                if modelbuilder.toolcontext.opt_inline_coloring_numbers.value then
-                                       self.header.add_decl("#define {m.const_color} {c}")
+                                       self.provide_declaration(m.const_color, "#define {m.const_color} {c}")
                                else
-                                       self.header.add_decl("extern const int {m.const_color};")
-                                       self.header.add("const int {m.const_color} = {c};")
+                                       self.provide_declaration(m.const_color, "extern const int {m.const_color};")
+                                       v.add("const int {m.const_color} = {c};")
                                end
                        else if m isa MType then
                                if modelbuilder.toolcontext.opt_inline_coloring_numbers.value then
-                                       self.header.add_decl("#define {m.const_color} {c}")
+                                       self.provide_declaration(m.const_color, "#define {m.const_color} {c}")
                                else
-                                       self.header.add_decl("extern const int {m.const_color};")
-                                       self.header.add("const int {m.const_color} = {c};")
+                                       self.provide_declaration(m.const_color, "extern const int {m.const_color};")
+                                       v.add("const int {m.const_color} = {c};")
                                end
                        end
+                       color_consts_done.add(m)
                end
        end
 
+       private var color_consts_done = new HashSet[Object]
+
        # colorize classe properties
        fun do_property_coloring do
-
-               # classes coloration
                var mclasses = new HashSet[MClass].from(modelbuilder.model.mclasses)
-               self.class_coloring = new ClassColoring(mainmodule)
-               class_coloring.colorize(mclasses)
+
+               # Layouts
+               var method_layout_builder: PropertyLayoutBuilder[MMethod]
+               var attribute_layout_builder: PropertyLayoutBuilder[MAttribute]
+               #FIXME PH and BM layouts too slow for large programs
+               #if modelbuilder.toolcontext.opt_bm_typing.value then
+               #       method_layout_builder = new MMethodBMizer(self.mainmodule)
+               #       attribute_layout_builder = new MAttributeBMizer(self.mainmodule)
+               #else if modelbuilder.toolcontext.opt_phmod_typing.value then
+               #       method_layout_builder = new MMethodHasher(new PHModOperator, self.mainmodule)
+               #       attribute_layout_builder = new MAttributeHasher(new PHModOperator, self.mainmodule)
+               #else if modelbuilder.toolcontext.opt_phand_typing.value then
+               #       method_layout_builder = new MMethodHasher(new PHAndOperator, self.mainmodule)
+               #       attribute_layout_builder = new MAttributeHasher(new PHAndOperator, self.mainmodule)
+               #else
+               method_layout_builder = new MMethodColorer(self.mainmodule)
+               attribute_layout_builder = new MAttributeColorer(self.mainmodule)
+               #end
 
                # methods coloration
-               var method_coloring = new MethodColoring(self.class_coloring)
-               self.method_colors = method_coloring.colorize
-               self.method_tables = method_coloring.build_property_tables
-               self.compile_color_consts(self.method_colors)
+               var method_layout = method_layout_builder.build_layout(mclasses)
+               self.method_tables = build_method_tables(mclasses, method_layout)
+               self.compile_color_consts(method_layout.pos)
+               self.method_layout = method_layout
 
                # attributes coloration
-               var attribute_coloring = new AttributeColoring(self.class_coloring)
-               self.attr_colors = attribute_coloring.colorize
-               self.attr_tables = attribute_coloring.build_property_tables
-               self.compile_color_consts(self.attr_colors)
+               var attr_layout = attribute_layout_builder.build_layout(mclasses)
+               self.attr_tables = build_attr_tables(mclasses, attr_layout)
+               self.compile_color_consts(attr_layout.pos)
+               self.attr_layout = attr_layout
+       end
 
-               if modelbuilder.toolcontext.opt_bm_typing.value then
-                       self.class_coloring = new NaiveClassColoring(mainmodule)
-                       self.class_coloring.colorize(mclasses)
+       fun build_method_tables(mclasses: Set[MClass], layout: Layout[MProperty]): Map[MClass, Array[nullable MPropDef]] do
+               var tables = new HashMap[MClass, Array[nullable MPropDef]]
+               for mclass in mclasses do
+                       var table = new Array[nullable MPropDef]
+                       # first, fill table from parents by reverse linearization order
+                       var parents = self.mainmodule.super_mclasses(mclass)
+                       var lin = self.mainmodule.reverse_linearize_mclasses(parents)
+                       for parent in lin do
+                               for mproperty in self.mainmodule.properties(parent) do
+                                       if not mproperty isa MMethod then continue
+                                       var color = layout.pos[mproperty]
+                                       if table.length <= color then
+                                               for i in [table.length .. color[ do
+                                                       table[i] = null
+                                               end
+                                       end
+                                       for mpropdef in mproperty.mpropdefs do
+                                               if mpropdef.mclassdef.mclass == parent then
+                                                       table[color] = mpropdef
+                                               end
+                                       end
+                               end
+                       end
+
+                       # then override with local properties
+                       for mproperty in self.mainmodule.properties(mclass) do
+                               if not mproperty isa MMethod then continue
+                               var color = layout.pos[mproperty]
+                               if table.length <= color then
+                                       for i in [table.length .. color[ do
+                                               table[i] = null
+                                       end
+                               end
+                               for mpropdef in mproperty.mpropdefs do
+                                       if mpropdef.mclassdef.mclass == mclass then
+                                               table[color] = mpropdef
+                                       end
+                               end
+                       end
+                       tables[mclass] = table
                end
+               return tables
+       end
 
-               # vt coloration
-               if modelbuilder.toolcontext.opt_bm_typing.value then
-                       var vt_coloring = new NaiveVTColoring(self.class_coloring)
-                       self.vt_colors = vt_coloring.colorize
-                       self.vt_tables = vt_coloring.build_property_tables
-               else if modelbuilder.toolcontext.opt_phmod_typing.value then
-                       var vt_coloring = new VTModPerfectHashing(self.class_coloring)
-                       self.vt_colors = vt_coloring.colorize
-                       self.vt_masks = vt_coloring.compute_masks
-                       self.vt_tables = vt_coloring.build_property_tables
-               else if modelbuilder.toolcontext.opt_phand_typing.value then
-                       var vt_coloring = new VTAndPerfectHashing(self.class_coloring)
-                       self.vt_colors = vt_coloring.colorize
-                       self.vt_masks = vt_coloring.compute_masks
-                       self.vt_tables = vt_coloring.build_property_tables
-               else
-                       var vt_coloring = new VTColoring(self.class_coloring)
-                       self.vt_colors = vt_coloring.colorize
-                       self.vt_tables = vt_coloring.build_property_tables
+       fun build_attr_tables(mclasses: Set[MClass], layout: Layout[MProperty]): Map[MClass, Array[nullable MPropDef]] do
+               var tables = new HashMap[MClass, Array[nullable MPropDef]]
+               for mclass in mclasses do
+                       var table = new Array[nullable MPropDef]
+                       # first, fill table from parents by reverse linearization order
+                       var parents = self.mainmodule.super_mclasses(mclass)
+                       var lin = self.mainmodule.reverse_linearize_mclasses(parents)
+                       for parent in lin do
+                               for mproperty in self.mainmodule.properties(parent) do
+                                       if not mproperty isa MAttribute then continue
+                                       var color = layout.pos[mproperty]
+                                       if table.length <= color then
+                                               for i in [table.length .. color[ do
+                                                       table[i] = null
+                                               end
+                                       end
+                                       for mpropdef in mproperty.mpropdefs do
+                                               if mpropdef.mclassdef.mclass == parent then
+                                                       table[color] = mpropdef
+                                               end
+                                       end
+                               end
+                       end
+
+                       # then override with local properties
+                       for mproperty in self.mainmodule.properties(mclass) do
+                               if not mproperty isa MAttribute then continue
+                               var color = layout.pos[mproperty]
+                               if table.length <= color then
+                                       for i in [table.length .. color[ do
+                                               table[i] = null
+                                       end
+                               end
+                               for mpropdef in mproperty.mpropdefs do
+                                       if mpropdef.mclassdef.mclass == mclass then
+                                               table[color] = mpropdef
+                                       end
+                               end
+                       end
+                       tables[mclass] = table
                end
-               self.compile_color_consts(self.vt_colors)
+               return tables
        end
 
        # colorize live types of the program
@@ -278,87 +349,48 @@ class SeparateCompiler
                end
 
                for mtype in mtypes do
-                       retieve_live_partial_types(mtype)
+                       retrieve_partial_types(mtype)
                end
                mtypes.add_all(self.partial_types)
 
-               # set type unique id
-               if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       var sorted_mtypes = new Array[MType].from(mtypes)
-                       var sorter = new ReverseTypeSorter(self.mainmodule)
-                       sorter.sort(sorted_mtypes)
-                       for mtype in sorted_mtypes do
-                               self.typeids[mtype] = self.typeids.length + 1
-                       end
-               else
-                       for mtype in mtypes do
-                               self.typeids[mtype] = self.typeids.length
-                       end
-               end
-
-               # VT and FT are stored with other unresolved types in the big unanchored_tables
-               self.compile_unanchored_tables(mtypes)
-
-               # colorize types
+               # Typing Layout
+               var layout_builder: TypingLayoutBuilder[MType]
                if modelbuilder.toolcontext.opt_bm_typing.value then
-                       var type_coloring = new NaiveTypeColoring(self.mainmodule)
-                       self.type_colors = type_coloring.colorize(mtypes)
-                       self.type_tables = self.build_type_tables(mtypes, type_colors, type_coloring)
+                       layout_builder = new MTypeBMizer(self.mainmodule)
                else if modelbuilder.toolcontext.opt_phmod_typing.value then
-                       var type_coloring = new TypeModPerfectHashing(self.mainmodule)
-                       self.type_colors = type_coloring.compute_masks(mtypes, typeids)
-                       self.type_tables = self.hash_type_tables(mtypes, typeids, type_colors, type_coloring)
-                       self.header.add_decl("#define HASH(mask, id) ((mask)%(id))")
+                       layout_builder = new MTypeHasher(new PHModOperator, self.mainmodule)
                else if modelbuilder.toolcontext.opt_phand_typing.value then
-                       var type_coloring = new TypeAndPerfectHashing(self.mainmodule)
-                       self.type_colors = type_coloring.compute_masks(mtypes, typeids)
-                       self.type_tables = self.hash_type_tables(mtypes, typeids, type_colors, type_coloring)
-                       self.header.add_decl("#define HASH(mask, id) ((mask)&(id))")
+                       layout_builder = new MTypeHasher(new PHAndOperator, self.mainmodule)
                else
-                       var type_coloring = new TypeColoring(self.mainmodule)
-                       self.type_colors = type_coloring.colorize(mtypes)
-                       self.type_tables = self.build_type_tables(mtypes, type_colors, type_coloring)
+                       layout_builder = new MTypeColorer(self.mainmodule)
                end
 
+               # colorize types
+               self.type_layout = layout_builder.build_layout(mtypes)
+               self.type_tables = self.build_type_tables(mtypes)
+
+               # VT and FT are stored with other unresolved types in the big resolution_tables
+               self.compile_resolution_tables(mtypes)
 
                return mtypes
        end
 
        # Build type tables
-       fun build_type_tables(mtypes: Set[MType], colors: Map[MType, Int], colorer: TypeColoring): Map[MType, Array[nullable MType]] do
+       fun build_type_tables(mtypes: Set[MType]): Map[MType, Array[nullable MType]] do
                var tables = new HashMap[MType, Array[nullable MType]]
-
+               var layout = self.type_layout
                for mtype in mtypes do
                        var table = new Array[nullable MType]
                        var supers = new HashSet[MType]
-                       supers.add_all(colorer.super_elements(mtype, mtypes))
+                       supers.add_all(self.mainmodule.super_mtypes(mtype, mtypes))
                        supers.add(mtype)
                        for sup in supers do
-                               var color = colors[sup]
-                               if table.length <= color then
-                                       for i in [table.length .. color[ do
-                                               table[i] = null
-                                       end
+                               var color: Int
+                               if layout isa PHLayout[MType, MType] then
+                                       color = layout.hashes[mtype][sup]
+                               else
+                                       color = layout.pos[sup]
                                end
-                               table[color] = sup
-                       end
-                       tables[mtype] = table
-               end
-               return tables
-       end
-
-       # Build type tables
-       fun hash_type_tables(mtypes: Set[MType], ids: Map[MType, Int], masks: Map[MType, Int], colorer: TypePerfectHashing): Map[MType, Array[nullable MType]] do
-               var tables = new HashMap[MType, Array[nullable MType]]
-
-               for mtype in mtypes do
-                       var table = new Array[nullable MType]
-                       var supers = new HashSet[MType]
-                       supers.add_all(colorer.super_elements(mtype, mtypes))
-                       supers.add(mtype)
-
-                       for sup in supers do
-                               var color = colorer.phash(ids[sup], masks[mtype])
                                if table.length <= color then
                                        for i in [table.length .. color[ do
                                                table[i] = null
@@ -371,70 +403,87 @@ class SeparateCompiler
                return tables
        end
 
-       protected fun compile_unanchored_tables(mtypes: Set[MType]) do
-               # Unanchored_tables is used to perform a type resolution at runtime in O(1)
+       protected fun compile_resolution_tables(mtypes: Set[MType]) do
+               # resolution_tables is used to perform a type resolution at runtime in O(1)
 
-               # During the visit of the body of classes, live_unanchored_types are collected
+               # During the visit of the body of classes, live_unresolved_types are collected
                # and associated to
-               # Collect all live_unanchored_types (visited in the body of classes)
+               # Collect all live_unresolved_types (visited in the body of classes)
 
                # Determinate fo each livetype what are its possible requested anchored types
-               var mtype2unanchored = new HashMap[MClassType, Set[MType]]
+               var mtype2unresolved = new HashMap[MClassType, Set[MType]]
                for mtype in self.runtime_type_analysis.live_types do
                        var set = new HashSet[MType]
                        for cd in mtype.collect_mclassdefs(self.mainmodule) do
-                               if self.live_unanchored_types.has_key(cd) then
-                                       set.add_all(self.live_unanchored_types[cd])
+                               if self.live_unresolved_types.has_key(cd) then
+                                       set.add_all(self.live_unresolved_types[cd])
                                end
                        end
-                       mtype2unanchored[mtype] = set
+                       mtype2unresolved[mtype] = set
                end
 
                # Compute the table layout with the prefered method
+               var resolution_builder: ResolutionLayoutBuilder
                if modelbuilder.toolcontext.opt_bm_typing.value then
-                       var unanchored_type_coloring = new NaiveUnanchoredTypeColoring
-                       self.unanchored_types_colors = unanchored_type_coloring.colorize(mtype2unanchored)
-                       self.unanchored_types_tables = unanchored_type_coloring.build_tables(mtype2unanchored)
+                       resolution_builder = new ResolutionBMizer
                else if modelbuilder.toolcontext.opt_phmod_typing.value then
-                       var unanchored_type_coloring = new UnanchoredTypeModPerfectHashing
-                       self.unanchored_types_colors = unanchored_type_coloring.colorize(mtype2unanchored)
-                       self.unanchored_types_masks = unanchored_type_coloring.compute_masks(mtype2unanchored)
-                       self.unanchored_types_tables = unanchored_type_coloring.build_tables(mtype2unanchored)
+                       resolution_builder = new ResolutionHasher(new PHModOperator)
                else if modelbuilder.toolcontext.opt_phand_typing.value then
-                       var unanchored_type_coloring = new UnanchoredTypeAndPerfectHashing
-                       self.unanchored_types_colors = unanchored_type_coloring.colorize(mtype2unanchored)
-                       self.unanchored_types_masks = unanchored_type_coloring.compute_masks(mtype2unanchored)
-                       self.unanchored_types_tables = unanchored_type_coloring.build_tables(mtype2unanchored)
+                       resolution_builder = new ResolutionHasher(new PHAndOperator)
                else
-                       var unanchored_type_coloring = new UnanchoredTypeColoring
-                       self.unanchored_types_colors = unanchored_type_coloring.colorize(mtype2unanchored)
-                       self.unanchored_types_tables = unanchored_type_coloring.build_tables(mtype2unanchored)
+                       resolution_builder = new ResolutionColorer
                end
+               self.resolution_layout = resolution_builder.build_layout(mtype2unresolved)
+               self.resolution_tables = self.build_resolution_tables(mtype2unresolved)
 
-               # Compile a C constant for each collected unanchored type.
-               # Either to a color, or to -1 if the unanchored type is dead (no live receiver can require it)
-               var all_unanchored = new HashSet[MType]
-               for t in self.live_unanchored_types.values do
-                       all_unanchored.add_all(t)
+               # Compile a C constant for each collected unresolved type.
+               # Either to a color, or to -1 if the unresolved type is dead (no live receiver can require it)
+               var all_unresolved = new HashSet[MType]
+               for t in self.live_unresolved_types.values do
+                       all_unresolved.add_all(t)
                end
-               var all_unanchored_types_colors = new HashMap[MType, Int]
-               for t in all_unanchored do
-                       if unanchored_types_colors.has_key(t) then
-                               all_unanchored_types_colors[t] = unanchored_types_colors[t]
+               var all_unresolved_types_colors = new HashMap[MType, Int]
+               for t in all_unresolved do
+                       if self.resolution_layout.pos.has_key(t) then
+                               all_unresolved_types_colors[t] = self.resolution_layout.pos[t]
                        else
-                               all_unanchored_types_colors[t] = -1
+                               all_unresolved_types_colors[t] = -1
                        end
                end
-               self.compile_color_consts(all_unanchored_types_colors)
+               self.compile_color_consts(all_unresolved_types_colors)
 
                #print "tables"
-               #for k, v in unanchored_types_tables.as(not null) do
+               #for k, v in unresolved_types_tables.as(not null) do
                #       print "{k}: {v.join(", ")}"
                #end
                #print ""
        end
 
-       fun retieve_live_partial_types(mtype: MType) do
+       fun build_resolution_tables(elements: Map[MClassType, Set[MType]]): Map[MClassType, Array[nullable MType]] do
+               var tables = new HashMap[MClassType, Array[nullable MType]]
+               var layout = self.resolution_layout
+               for mclasstype, mtypes in elements do
+                       var table = new Array[nullable MType]
+                       for mtype in mtypes do
+                               var color: Int
+                               if layout isa PHLayout[MClassType, MType] then
+                                       color = layout.hashes[mclasstype][mtype]
+                               else
+                                       color = layout.pos[mtype]
+                               end
+                               if table.length <= color then
+                                       for i in [table.length .. color[ do
+                                               table[i] = null
+                                       end
+                               end
+                               table[color] = mtype
+                       end
+                       tables[mclasstype] = table
+               end
+               return tables
+       end
+
+       fun retrieve_partial_types(mtype: MType) do
                # add formal types arguments to mtypes
                if mtype isa MGenericType then
                        for ft in mtype.arguments do
@@ -443,7 +492,7 @@ class SeparateCompiler
                                        abort
                                end
                                self.partial_types.add(ft)
-                               retieve_live_partial_types(ft)
+                               retrieve_partial_types(ft)
                        end
                end
                var mclass_type: MClassType
@@ -454,9 +503,9 @@ class SeparateCompiler
                end
 
                # add virtual types to mtypes
-               for vt in self.vt_tables[mclass_type.mclass] do
-                       if vt != null then
-                               var anchored = vt.bound.anchor_to(self.mainmodule, mclass_type)
+               for vt in self.mainmodule.properties(mclass_type.mclass) do
+                       if vt isa MVirtualTypeProp then
+                               var anchored = vt.mvirtualtype.lookup_bound(self.mainmodule, mclass_type).anchor_to(self.mainmodule, mclass_type)
                                self.partial_types.add(anchored)
                        end
                end
@@ -471,12 +520,10 @@ class SeparateCompiler
                        for pd in cd.mpropdefs do
                                if not pd isa MMethodDef then continue
                                #print "compile {pd} @ {cd} @ {mmodule}"
-                               var r = new SeparateRuntimeFunction(pd)
+                               var r = pd.separate_runtime_function
                                r.compile_to_c(self)
-                               if true or cd.bound_mtype.ctype != "val*" then
-                                       var r2 = new VirtualRuntimeFunction(pd)
-                                       r2.compile_to_c(self)
-                               end
+                               var r2 = pd.virtual_runtime_function
+                               r2.compile_to_c(self)
                        end
                end
                self.mainmodule = old_module
@@ -490,29 +537,26 @@ class SeparateCompiler
                v.add_decl("/* runtime type {mtype} */")
 
                # extern const struct type_X
-               self.header.add_decl("extern const struct type_{c_name} type_{c_name};")
-               self.header.add_decl("struct type_{c_name} \{")
-               self.header.add_decl("int id;")
-               self.header.add_decl("const char *name;")
-               self.header.add_decl("int color;")
-               self.header.add_decl("short int is_nullable;")
-               self.header.add_decl("const struct types *unanchored_table;")
-               self.header.add_decl("int table_size;")
-               self.header.add_decl("int type_table[{self.type_tables[mtype].length}];")
-               self.header.add_decl("\};")
+               self.provide_declaration("type_{c_name}", "extern const struct type type_{c_name};")
 
                # const struct type_X
-               v.add_decl("const struct type_{c_name} type_{c_name} = \{")
-               v.add_decl("{self.typeids[mtype]},")
+               v.add_decl("const struct type type_{c_name} = \{")
+               v.add_decl("{self.type_layout.ids[mtype]},")
                v.add_decl("\"{mtype}\", /* class_name_string */")
-               v.add_decl("{self.type_colors[mtype]},")
+               var layout = self.type_layout
+               if layout isa PHLayout[MType, MType] then
+                       v.add_decl("{layout.masks[mtype]},")
+               else
+                       v.add_decl("{layout.pos[mtype]},")
+               end
                if mtype isa MNullableType then
                        v.add_decl("1,")
                else
                        v.add_decl("0,")
                end
-               if compile_type_unanchored_table(mtype) then
-                       v.add_decl("(struct types*) &unanchored_table_{c_name},")
+               if compile_type_resolution_table(mtype) then
+                       v.require_declaration("resolution_table_{c_name}")
+                       v.add_decl("&resolution_table_{c_name},")
                else
                        v.add_decl("NULL,")
                end
@@ -522,14 +566,14 @@ class SeparateCompiler
                        if stype == null then
                                v.add_decl("-1, /* empty */")
                        else
-                               v.add_decl("{self.typeids[stype]}, /* {stype} */")
+                               v.add_decl("{self.type_layout.ids[stype]}, /* {stype} */")
                        end
                end
                v.add_decl("\},")
                v.add_decl("\};")
        end
 
-       protected fun compile_type_fts_table(mtype: MType): Bool do
+       fun compile_type_resolution_table(mtype: MType): Bool do
 
                var mclass_type: MClassType
                if mtype isa MNullableType then
@@ -537,141 +581,23 @@ class SeparateCompiler
                else
                        mclass_type = mtype.as(MClassType)
                end
-               if self.ft_tables[mclass_type.mclass].is_empty then return false
+               if not self.resolution_tables.has_key(mclass_type) then return false
 
-               # extern const struct fst_table_X fst_table_X
-               self.header.add_decl("extern const struct fts_table_{mtype.c_name} fts_table_{mtype.c_name};")
-               self.header.add_decl("struct fts_table_{mtype.c_name} \{")
-               if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       self.header.add_decl("int mask;")
-               end
-               self.header.add_decl("struct type *types[{self.ft_tables[mclass_type.mclass].length}];")
-               self.header.add_decl("\};")
+               var layout = self.resolution_layout
 
-               # const struct fts_table_X fts_table_X
-               var v = new_visitor
-               v.add_decl("const struct fts_table_{mtype.c_name} fts_table_{mtype.c_name} = \{")
-               if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       v.add_decl("{self.ft_masks[mclass_type.mclass]},")
-               end
-               v.add_decl("\{")
-               for ft in self.ft_tables[mclass_type.mclass] do
-                       if ft == null then
-                               v.add_decl("NULL, /* empty */")
-                       else
-                               var ntype: MType
-                               if ft.mclass == mclass_type.mclass then
-                                       ntype = mclass_type.arguments[ft.rank]
-                               else
-                                       ntype = ft.anchor_to(self.mainmodule, mclass_type)
-                               end
-                               if self.typeids.has_key(ntype) then
-                                       v.add_decl("(struct type*)&type_{ntype.c_name}, /* {ft} ({ntype}) */")
-                               else
-                                       v.add_decl("NULL, /* empty ({ft} not a live type) */")
-                               end
-                       end
-               end
-               v.add_decl("\},")
-               v.add_decl("\};")
-               return true
-       end
-
-       protected fun compile_type_vts_table(mtype: MType): Bool do
-
-               var mclass_type: MClassType
-               if mtype isa MNullableType then
-                       mclass_type = mtype.mtype.as(MClassType)
-               else
-                       mclass_type = mtype.as(MClassType)
-               end
-               if self.vt_tables[mclass_type.mclass].is_empty then return false
-
-               # extern const struct vts_table_X vts_table_X
-               self.header.add_decl("extern const struct vts_table_{mtype.c_name} vts_table_{mtype.c_name};")
-               self.header.add_decl("struct vts_table_{mtype.c_name} \{")
-               if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       self.header.add_decl("int mask;")
-               end
-               self.header.add_decl("struct type *types[{self.vt_tables[mclass_type.mclass].length}];")
-               self.header.add_decl("\};")
-
-               # const struct vts_table_X vts_table_X
-               var v = new_visitor
-               v.add_decl("const struct vts_table_{mtype.c_name} vts_table_{mtype.c_name} = \{")
-               if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       v.add_decl("{vt_masks[mclass_type.mclass]},")
-               end
-               v.add_decl("\{")
-
-               for vt in self.vt_tables[mclass_type.mclass] do
-                       if vt == null then
-                               v.add_decl("NULL, /* empty */")
-                       else
-                               var bound = vt.bound
-                               if bound == null then
-                                       #FIXME how can a bound be null here ?
-                                       print "No bound found for virtual type {vt} ?"
-                                       abort
-                               else
-                                       var is_nullable = ""
-                                       if bound isa MNullableType then
-                                               bound = bound.mtype
-                                               is_nullable = "nullable_"
-                                       end
-                                       if bound isa MVirtualType then
-                                               bound = bound.anchor_to(self.mainmodule, mclass_type)
-                                       else if bound isa MParameterType then
-                                               bound = bound.anchor_to(self.mainmodule, mclass_type)
-                                       else if bound isa MGenericType and bound.need_anchor then
-                                               bound = bound.anchor_to(self.mainmodule, mclass_type)
-                                       else if bound isa MClassType then
-                                       else
-                                               print "NOT YET IMPLEMENTED: mtype_to_livetype with type: {bound}"
-                                               abort
-                                       end
-
-                                       if self.typeids.has_key(bound) then
-                                               v.add_decl("(struct type*)&type_{is_nullable}{bound.c_name}, /* {bound} */")
-                                       else
-                                               v.add_decl("NULL, /* dead type {bound} */")
-                                       end
-                               end
-                       end
-               end
-               v.add_decl("\},")
-               v.add_decl("\};")
-               return true
-       end
-
-       fun compile_type_unanchored_table(mtype: MType): Bool do
-
-               var mclass_type: MClassType
-               if mtype isa MNullableType then
-                       mclass_type = mtype.mtype.as(MClassType)
-               else
-                       mclass_type = mtype.as(MClassType)
-               end
-               if not self.unanchored_types_tables.has_key(mclass_type) then return false
-
-               # extern const struct unanchored_table_X unanchored_table_X
-               self.header.add_decl("extern const struct unanchored_table_{mtype.c_name} unanchored_table_{mtype.c_name};")
-
-               self.header.add_decl("struct unanchored_table_{mtype.c_name} \{")
-               if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       self.header.add_decl("int mask;")
-               end
-               self.header.add_decl("struct type *types[{self.unanchored_types_tables[mclass_type].length}];")
-               self.header.add_decl("\};")
+               # extern const struct resolution_table_X resolution_table_X
+               self.provide_declaration("resolution_table_{mtype.c_name}", "extern const struct types resolution_table_{mtype.c_name};")
 
                # const struct fts_table_X fts_table_X
                var v = new_visitor
-               v.add_decl("const struct unanchored_table_{mtype.c_name} unanchored_table_{mtype.c_name} = \{")
-               if modelbuilder.toolcontext.opt_phmod_typing.value or modelbuilder.toolcontext.opt_phand_typing.value then
-                       v.add_decl("{self.unanchored_types_masks[mclass_type]},")
+               v.add_decl("const struct types resolution_table_{mtype.c_name} = \{")
+               if layout isa PHLayout[MClassType, MType] then
+                       v.add_decl("{layout.masks[mclass_type]},")
+               else
+                       v.add_decl("0, /* dummy */")
                end
                v.add_decl("\{")
-               for t in self.unanchored_types_tables[mclass_type] do
+               for t in self.resolution_tables[mclass_type] do
                        if t == null then
                                v.add_decl("NULL, /* empty */")
                        else
@@ -680,14 +606,15 @@ class SeparateCompiler
                                # the value stored is tv.
                                var tv = t.resolve_for(mclass_type, mclass_type, self.mainmodule, true)
                                # FIXME: What typeids means here? How can a tv not be live?
-                               if self.typeids.has_key(tv) then
-                                       v.add_decl("(struct type*)&type_{tv.c_name}, /* {t}: {tv} */")
+                               if self.type_layout.ids.has_key(tv) then
+                                       v.require_declaration("type_{tv.c_name}")
+                                       v.add_decl("&type_{tv.c_name}, /* {t}: {tv} */")
                                else
                                        v.add_decl("NULL, /* empty ({t}: {tv} not a live type) */")
                                end
                        end
                end
-               v.add_decl("\},")
+               v.add_decl("\}")
                v.add_decl("\};")
                return true
        end
@@ -705,19 +632,10 @@ class SeparateCompiler
                var v = new_visitor
 
                v.add_decl("/* runtime class {c_name} */")
-               var idnum = classids.length
-               var idname = "ID_" + c_name
-               self.classids[mtype] = idname
-               #self.header.add_decl("#define {idname} {idnum} /* {c_name} */")
-
-               self.header.add_decl("struct class_{c_name} \{")
-               self.header.add_decl("int box_kind;")
-               self.header.add_decl("nitmethod_t vft[{vft.length}];")
-               self.header.add_decl("\};")
 
                # Build class vft
-               self.header.add_decl("extern const struct class_{c_name} class_{c_name};")
-               v.add_decl("const struct class_{c_name} class_{c_name} = \{")
+               self.provide_declaration("class_{c_name}", "extern const struct class class_{c_name};")
+               v.add_decl("const struct class class_{c_name} = \{")
                v.add_decl("{self.box_kind_of(mclass)}, /* box_kind */")
                v.add_decl("\{")
                for i in [0 .. vft.length[ do
@@ -725,11 +643,10 @@ class SeparateCompiler
                        if mpropdef == null then
                                v.add_decl("NULL, /* empty */")
                        else
-                               if true or mpropdef.mclassdef.bound_mtype.ctype != "val*" then
-                                       v.add_decl("(nitmethod_t)VIRTUAL_{mpropdef.c_name}, /* pointer to {mclass.intro_mmodule}:{mclass}:{mpropdef} */")
-                               else
-                                       v.add_decl("(nitmethod_t){mpropdef.c_name}, /* pointer to {mclass.intro_mmodule}:{mclass}:{mpropdef} */")
-                               end
+                               assert mpropdef isa MMethodDef
+                               var rf = mpropdef.virtual_runtime_function
+                               v.require_declaration(rf.c_name)
+                               v.add_decl("(nitmethod_t){rf.c_name}, /* pointer to {mclass.intro_mmodule}:{mclass}:{mpropdef} */")
                        end
                end
                v.add_decl("\}")
@@ -745,63 +662,56 @@ class SeparateCompiler
 
                        if not self.runtime_type_analysis.live_types.has(mtype) then return
 
+                       #Build BOX
                        self.header.add_decl("val* BOX_{c_name}({mtype.ctype});")
                        v.add_decl("/* allocate {mtype} */")
                        v.add_decl("val* BOX_{mtype.c_name}({mtype.ctype} value) \{")
-                       v.add("struct instance_{c_name}*res = GC_MALLOC(sizeof(struct instance_{c_name}));")
-                       v.add("res->type = (struct type*) &type_{c_name};")
-                       v.add("res->class = (struct class*) &class_{c_name};")
+                       v.add("struct instance_{c_name}*res = nit_alloc(sizeof(struct instance_{c_name}));")
+                       v.require_declaration("type_{c_name}")
+                       v.add("res->type = &type_{c_name};")
+                       v.require_declaration("class_{c_name}")
+                       v.add("res->class = &class_{c_name};")
                        v.add("res->value = value;")
                        v.add("return (val*)res;")
                        v.add("\}")
                        return
-               end
-
-               var is_native_array = mclass.name == "NativeArray"
-
-               var sig
-               if is_native_array then
-                       sig = "int length, struct type* type"
-               else
-                       sig = "struct type* type"
-               end
-
-               #Build instance struct
-               #extern const struct instance_array__NativeArray instance_array__NativeArray;
-               self.header.add_decl("struct instance_{c_name} \{")
-               self.header.add_decl("const struct type *type;")
-               self.header.add_decl("const struct class *class;")
-               self.header.add_decl("nitattribute_t attrs[{attrs.length}];")
-               if is_native_array then
+               else if mclass.name == "NativeArray" then
+                       #Build instance struct
+                       self.header.add_decl("struct instance_{c_name} \{")
+                       self.header.add_decl("const struct type *type;")
+                       self.header.add_decl("const struct class *class;")
                        # NativeArrays are just a instance header followed by an array of values
                        self.header.add_decl("val* values[0];")
-               end
-               self.header.add_decl("\};")
+                       self.header.add_decl("\};")
 
+                       #Build NEW
+                       self.provide_declaration("NEW_{c_name}", "{mtype.ctype} NEW_{c_name}(int length, const struct type* type);")
+                       v.add_decl("/* allocate {mtype} */")
+                       v.add_decl("{mtype.ctype} NEW_{c_name}(int length, const struct type* type) \{")
+                       var res = v.new_named_var(mtype, "self")
+                       res.is_exact = true
+                       var mtype_elt = mtype.arguments.first
+                       v.add("{res} = nit_alloc(sizeof(struct instance_{c_name}) + length*sizeof({mtype_elt.ctype}));")
+                       v.add("{res}->type = type;")
+                       hardening_live_type(v, "type")
+                       v.require_declaration("class_{c_name}")
+                       v.add("{res}->class = &class_{c_name};")
+                       v.add("return {res};")
+                       v.add("\}")
+                       return
+               end
 
-               self.header.add_decl("{mtype.ctype} NEW_{c_name}({sig});")
+               #Build NEW
+               self.provide_declaration("NEW_{c_name}", "{mtype.ctype} NEW_{c_name}(const struct type* type);")
                v.add_decl("/* allocate {mtype} */")
-               v.add_decl("{mtype.ctype} NEW_{c_name}({sig}) \{")
+               v.add_decl("{mtype.ctype} NEW_{c_name}(const struct type* type) \{")
                var res = v.new_named_var(mtype, "self")
                res.is_exact = true
-               if is_native_array then
-                       var mtype_elt = mtype.arguments.first
-                       v.add("{res} = GC_MALLOC(sizeof(struct instance_{c_name}) + length*sizeof({mtype_elt.ctype}));")
-               else
-                       v.add("{res} = GC_MALLOC(sizeof(struct instance_{c_name}));")
-               end
+               v.add("{res} = nit_alloc(sizeof(struct instance) + {attrs.length}*sizeof(nitattribute_t));")
                v.add("{res}->type = type;")
-               if v.compiler.modelbuilder.toolcontext.opt_hardening.value then
-                       v.add("if(type == NULL) \{")
-                       v.add_abort("type null")
-                       v.add("\}")
-                       v.add("if(type->unanchored_table == NULL) \{")
-                       v.add("fprintf(stderr, \"Insantiation of a dead type: %s\\n\", type->name);")
-                       v.add_abort("type dead")
-                       v.add("\}")
-               end
-               v.add("{res}->class = (struct class*) &class_{c_name};")
-
+               hardening_live_type(v, "type")
+               v.require_declaration("class_{c_name}")
+               v.add("{res}->class = &class_{c_name};")
                self.generate_init_attr(v, res, mtype)
                v.add("return {res};")
                v.add("\}")
@@ -809,6 +719,19 @@ class SeparateCompiler
                generate_check_init_instance(mtype)
        end
 
+       # Add a dynamic test to ensure that the type referenced by `t` is a live type
+       fun hardening_live_type(v: VISITOR, t: String)
+       do
+               if not v.compiler.modelbuilder.toolcontext.opt_hardening.value then return
+               v.add("if({t} == NULL) \{")
+               v.add_abort("type null")
+               v.add("\}")
+               v.add("if({t}->resolution_table == NULL) \{")
+               v.add("fprintf(stderr, \"Insantiation of a dead type: %s\\n\", {t}->name);")
+               v.add_abort("type dead")
+               v.add("\}")
+       end
+
        redef fun generate_check_init_instance(mtype)
        do
                if self.modelbuilder.toolcontext.opt_no_check_initialization.value then return
@@ -816,7 +739,7 @@ class SeparateCompiler
                var v = self.new_visitor
                var c_name = mtype.mclass.c_name
                var res = new RuntimeVariable("self", mtype, mtype)
-               self.header.add_decl("void CHECK_NEW_{c_name}({mtype.ctype});")
+               self.provide_declaration("CHECK_NEW_{c_name}", "void CHECK_NEW_{c_name}({mtype.ctype});")
                v.add_decl("/* allocate {mtype} */")
                v.add_decl("void CHECK_NEW_{c_name}({mtype.ctype} {res}) \{")
                self.generate_check_attr(v, res, mtype)
@@ -827,38 +750,60 @@ class SeparateCompiler
 
        # Stats
 
+       private var type_tables: Map[MType, Array[nullable MType]] = new HashMap[MType, Array[nullable MType]]
+       private var resolution_tables: Map[MClassType, Array[nullable MType]] = new HashMap[MClassType, Array[nullable MType]]
+       protected var method_tables: Map[MClass, Array[nullable MPropDef]] = new HashMap[MClass, Array[nullable MPropDef]]
+       protected var attr_tables: Map[MClass, Array[nullable MPropDef]] = new HashMap[MClass, Array[nullable MPropDef]]
+
        redef fun display_stats
        do
                super
-               if self.modelbuilder.toolcontext.opt_typing_table_metrics.value then
+               if self.modelbuilder.toolcontext.opt_tables_metrics.value then
                        display_sizes
                end
        end
 
        fun display_sizes
        do
-               print "# size of tables"
-               print "\trs size\trs hole\tst size\tst hole"
-               var rt_table = 0
-               var rt_holes = 0
-               var st_table = 0
-               var st_holes = 0
-               var rtables = unanchored_types_tables
-               if rtables != null then
-                       for unanch, table in rtables do
-                               rt_table += table.length
-                               for e in table do if e == null then rt_holes += 1
-                       end
-               end
-
-               var ttables = type_tables
-               if ttables != null then
-                       for t, table in ttables do
-                               st_table += table.length
-                               for e in table do if e == null then st_holes += 1
-                       end
-               end
-               print "\t{rt_table}\t{rt_holes}\t{st_table}\t{st_holes}"
+               print "# size of subtyping tables"
+               print "\ttotal \tholes"
+               var total = 0
+               var holes = 0
+               for t, table in type_tables do
+                       total += table.length
+                       for e in table do if e == null then holes += 1
+               end
+               print "\t{total}\t{holes}"
+
+               print "# size of resolution tables"
+               print "\ttotal \tholes"
+               total = 0
+               holes = 0
+               for t, table in resolution_tables do
+                       total += table.length
+                       for e in table do if e == null then holes += 1
+               end
+               print "\t{total}\t{holes}"
+
+               print "# size of methods tables"
+               print "\ttotal \tholes"
+               total = 0
+               holes = 0
+               for t, table in method_tables do
+                       total += table.length
+                       for e in table do if e == null then holes += 1
+               end
+               print "\t{total}\t{holes}"
+
+               print "# size of attributes tables"
+               print "\ttotal \tholes"
+               total = 0
+               holes = 0
+               for t, table in attr_tables do
+                       total += table.length
+                       for e in table do if e == null then holes += 1
+               end
+               print "\t{total}\t{holes}"
        end
 end
 
@@ -918,6 +863,7 @@ class SeparateCompilerVisitor
                if value.mtype.ctype == "val*" then
                        return "{value}->type"
                else
+                       self.require_declaration("type_{value.mtype.c_name}")
                        return "(&type_{value.mtype.c_name})"
                end
        end
@@ -925,7 +871,13 @@ class SeparateCompilerVisitor
        redef fun send(mmethod, arguments)
        do
                if arguments.first.mcasttype.ctype != "val*" then
-                       return self.monomorphic_send(mmethod, arguments.first.mcasttype, arguments)
+                       # In order to shortcut the primitive, we need to find the most specific method
+                       # Howverr, because of performance (no flattening), we always work on the realmainmodule
+                       var m = self.compiler.mainmodule
+                       self.compiler.mainmodule = self.compiler.realmainmodule
+                       var res = self.monomorphic_send(mmethod, arguments.first.mcasttype, arguments)
+                       self.compiler.mainmodule = m
+                       return res
                end
 
                var res: nullable RuntimeVariable
@@ -1006,6 +958,7 @@ class SeparateCompilerVisitor
 
                var r
                if ret == null then r = "void" else r = ret.ctype
+               self.require_declaration(mmethod.const_color)
                var call = "(({r} (*)({s}))({arguments.first}->class->vft[{mmethod.const_color}]))({ss}) /* {mmethod} on {arguments.first.inspect}*/"
 
                if res != null then
@@ -1054,6 +1007,7 @@ class SeparateCompilerVisitor
                # Autobox arguments
                self.adapt_signature(mmethoddef, arguments)
 
+               self.require_declaration(mmethoddef.c_name)
                if res == null then
                        self.add("{mmethoddef.c_name}({arguments.join(", ")});")
                        return null
@@ -1064,12 +1018,19 @@ class SeparateCompilerVisitor
                return res
        end
 
+       redef fun supercall(m: MMethodDef, recvtype: MClassType, args: Array[RuntimeVariable]): nullable RuntimeVariable
+       do
+               # FIXME implements a polymorphic access in tables
+               m = m.lookup_next_definition(m.mclassdef.mmodule, m.mclassdef.bound_mtype)
+               return self.call(m, recvtype, args)
+       end
+
        redef fun vararg_instance(mpropdef, recv, varargs, elttype)
        do
                # A vararg must be stored into an new array
                # The trick is that the dymaic type of the array may depends on the receiver
                # of the method (ie recv) if the static type is unresolved
-               # This is more complex than usual because the unanchored type must not be resolved
+               # This is more complex than usual because the unresolved type must not be resolved
                # with the current receiver (ie self).
                # Therefore to isolate the resolution from self, a local Frame is created.
                # One can see this implementation as an inlined method of the receiver whose only
@@ -1098,6 +1059,7 @@ class SeparateCompilerVisitor
                        return res
                end
 
+               self.require_declaration(a.const_color)
                if self.compiler.modelbuilder.toolcontext.opt_no_union_attribute.value then
                        self.add("{res} = {recv}->attrs[{a.const_color}] != NULL; /* {a} on {recv.inspect}*/")
                else
@@ -1120,6 +1082,7 @@ class SeparateCompilerVisitor
                var intromclassdef = a.intro.mclassdef
                ret = ret.resolve_for(intromclassdef.bound_mtype, intromclassdef.bound_mtype, intromclassdef.mmodule, true)
 
+               self.require_declaration(a.const_color)
                if self.compiler.modelbuilder.toolcontext.opt_no_union_attribute.value then
                        # Get the attribute or a box (ie. always a val*)
                        var cret = self.object_type.as_nullable
@@ -1165,6 +1128,7 @@ class SeparateCompilerVisitor
                # Adapt the value to the declared type
                value = self.autobox(value, mtype)
 
+               self.require_declaration(a.const_color)
                if self.compiler.modelbuilder.toolcontext.opt_no_union_attribute.value then
                        var attr = "{recv}->attrs[{a.const_color}]"
                        if mtype.ctype != "val*" then
@@ -1186,67 +1150,30 @@ class SeparateCompilerVisitor
                end
        end
 
-       # Build livetype structure retrieving
-       # ENSURE: mtype.need_anchor
-       fun retrieve_anchored_livetype(mtype: MGenericType, buffer: Buffer) do
-               assert mtype.need_anchor
-
-               var compiler = self.compiler
-               for ft in mtype.arguments do
-
-                       var ntype = ft
-                       var s: String = ""
-                       if ntype isa MNullableType then
-                               ntype = ntype.mtype
-                       end
-
-                       var recv = self.frame.arguments.first
-                       var recv_type_info = self.type_info(recv)
-                       if ntype isa MParameterType then
-                               if compiler.modelbuilder.toolcontext.opt_phmod_typing.value or compiler.modelbuilder.toolcontext.opt_phand_typing.value then
-                                       buffer.append("[{recv_type_info}->fts_table->types[HASH({recv_type_info}->fts_table->mask, {ntype.const_color})]->livecolor]")
-                               else
-                                       buffer.append("[{recv_type_info}->fts_table->types[{ntype.const_color}]->livecolor]")
-                               end
-                       else if ntype isa MVirtualType then
-                               if compiler.modelbuilder.toolcontext.opt_phmod_typing.value or compiler.modelbuilder.toolcontext.opt_phand_typing.value then
-                                       buffer.append("[{recv_type_info}->vts_table->types[HASH({recv_type_info}->vts_table->mask, {ntype.mproperty.const_color})]->livecolor]")
-                               else
-                                       buffer.append("[{recv_type_info}->vts_table->types[{ntype.mproperty.const_color}]->livecolor]")
-                               end
-                       else if ntype isa MGenericType and ntype.need_anchor then
-                               var bbuff = new Buffer
-                               retrieve_anchored_livetype(ntype, bbuff)
-                               buffer.append("[livetypes_{ntype.mclass.c_name}{bbuff.to_s}->livecolor]")
-                       else if ntype isa MClassType then
-                               compiler.undead_types.add(ft)
-                               buffer.append("[type_{ft.c_name}.livecolor]")
-                       else
-                               self.add("printf(\"NOT YET IMPLEMENTED: init_instance(%s, {mtype}).\\n\", \"{ft}\"); exit(1);")
-                       end
-               end
-       end
-
        redef fun init_instance(mtype)
        do
+               self.require_declaration("NEW_{mtype.mclass.c_name}")
                var compiler = self.compiler
                if mtype isa MGenericType and mtype.need_anchor then
-                       link_unanchored_type(self.frame.mpropdef.mclassdef, mtype)
+                       link_unresolved_type(self.frame.mpropdef.mclassdef, mtype)
                        var recv = self.frame.arguments.first
                        var recv_type_info = self.type_info(recv)
+                       self.require_declaration(mtype.const_color)
                        if compiler.modelbuilder.toolcontext.opt_phmod_typing.value or compiler.modelbuilder.toolcontext.opt_phand_typing.value then
-                               return self.new_expr("NEW_{mtype.mclass.c_name}((struct type *) {recv_type_info}->unanchored_table->types[HASH({recv_type_info}->unanchored_table->mask, {mtype.const_color})])", mtype)
+                               return self.new_expr("NEW_{mtype.mclass.c_name}({recv_type_info}->resolution_table->types[HASH({recv_type_info}->resolution_table->mask, {mtype.const_color})])", mtype)
                        else
-                               return self.new_expr("NEW_{mtype.mclass.c_name}((struct type *) {recv_type_info}->unanchored_table->types[{mtype.const_color}])", mtype)
+                               return self.new_expr("NEW_{mtype.mclass.c_name}({recv_type_info}->resolution_table->types[{mtype.const_color}])", mtype)
                        end
                end
                compiler.undead_types.add(mtype)
-               return self.new_expr("NEW_{mtype.mclass.c_name}((struct type *) &type_{mtype.c_name})", mtype)
+               self.require_declaration("type_{mtype.c_name}")
+               return self.new_expr("NEW_{mtype.mclass.c_name}(&type_{mtype.c_name})", mtype)
        end
 
        redef fun check_init_instance(value, mtype)
        do
                if self.compiler.modelbuilder.toolcontext.opt_no_check_initialization.value then return
+               self.require_declaration("CHECK_NEW_{mtype.mclass.c_name}")
                self.add("CHECK_NEW_{mtype.mclass.c_name}({value});")
        end
 
@@ -1284,14 +1211,15 @@ class SeparateCompilerVisitor
 
                if ntype.need_anchor then
                        var type_struct = self.get_name("type_struct")
-                       self.add_decl("struct type* {type_struct};")
+                       self.add_decl("const struct type* {type_struct};")
 
-                       # Either with unanchored_table with a direct resolution
-                       link_unanchored_type(self.frame.mpropdef.mclassdef, ntype)
+                       # Either with resolution_table with a direct resolution
+                       link_unresolved_type(self.frame.mpropdef.mclassdef, ntype)
+                       self.require_declaration(ntype.const_color)
                        if compiler.modelbuilder.toolcontext.opt_phmod_typing.value or compiler.modelbuilder.toolcontext.opt_phand_typing.value then
-                               self.add("{type_struct} = {recv_type_info}->unanchored_table->types[HASH({recv_type_info}->unanchored_table->mask, {ntype.const_color})];")
+                               self.add("{type_struct} = {recv_type_info}->resolution_table->types[HASH({recv_type_info}->resolution_table->mask, {ntype.const_color})];")
                        else
-                               self.add("{type_struct} = {recv_type_info}->unanchored_table->types[{ntype.const_color}];")
+                               self.add("{type_struct} = {recv_type_info}->resolution_table->types[{ntype.const_color}];")
                        end
                        if compiler.modelbuilder.toolcontext.opt_typing_test_metrics.value then
                                self.compiler.count_type_test_unresolved[tag] += 1
@@ -1307,6 +1235,7 @@ class SeparateCompilerVisitor
                        end
                else if ntype isa MClassType then
                        compiler.undead_types.add(mtype)
+                       self.require_declaration("type_{mtype.c_name}")
                        self.add("{cltype} = type_{mtype.c_name}.color;")
                        self.add("{idtype} = type_{mtype.c_name}.id;")
                        if compiler.modelbuilder.toolcontext.opt_typing_test_metrics.value then
@@ -1355,7 +1284,8 @@ class SeparateCompilerVisitor
                                self.add("{res} = 0; /* is_same_type_test: incompatible types {value1.mtype} vs. {value2.mtype}*/")
                        else
                                var mtype1 = value1.mtype.as(MClassType)
-                               self.add("{res} = ({value2} != NULL) && ({value2}->class == (struct class*) &class_{mtype1.c_name}); /* is_same_type_test */")
+                               self.require_declaration("class_{mtype1.c_name}")
+                               self.add("{res} = ({value2} != NULL) && ({value2}->class == &class_{mtype1.c_name}); /* is_same_type_test */")
                        end
                else
                        self.add("{res} = ({value1} == {value2}) || ({value1} != NULL && {value2} != NULL && {value1}->class == {value2}->class); /* is_same_type_test */")
@@ -1370,6 +1300,7 @@ class SeparateCompilerVisitor
                if value.mtype.ctype == "val*" then
                        self.add "{res} = {value} == NULL ? \"null\" : {value}->type->name;"
                else
+                       self.require_declaration("type_{value.mtype.c_name}")
                        self.add "{res} = type_{value.mtype.c_name}.name;"
                end
                return res
@@ -1390,7 +1321,8 @@ class SeparateCompilerVisitor
                                self.add("{res} = 0; /* incompatible types {value1.mtype} vs. {value2.mtype}*/")
                        else
                                var mtype1 = value1.mtype.as(MClassType)
-                               self.add("{res} = ({value2} != NULL) && ({value2}->class == (struct class*) &class_{mtype1.c_name});")
+                               self.require_declaration("class_{mtype1.c_name}")
+                               self.add("{res} = ({value2} != NULL) && ({value2}->class == &class_{mtype1.c_name});")
                                self.add("if ({res}) \{")
                                self.add("{res} = ({self.autobox(value2, value1.mtype)} == {value1});")
                                self.add("\}")
@@ -1501,20 +1433,23 @@ class SeparateCompilerVisitor
        fun native_array_instance(elttype: MType, length: RuntimeVariable): RuntimeVariable
        do
                var mtype = self.get_class("NativeArray").get_mtype([elttype])
+               self.require_declaration("NEW_{mtype.mclass.c_name}")
                assert mtype isa MGenericType
                var compiler = self.compiler
                if mtype.need_anchor then
-                       link_unanchored_type(self.frame.mpropdef.mclassdef, mtype)
+                       link_unresolved_type(self.frame.mpropdef.mclassdef, mtype)
                        var recv = self.frame.arguments.first
                        var recv_type_info = self.type_info(recv)
+                       self.require_declaration(mtype.const_color)
                        if compiler.modelbuilder.toolcontext.opt_phmod_typing.value or compiler.modelbuilder.toolcontext.opt_phand_typing.value then
-                               return self.new_expr("NEW_{mtype.mclass.c_name}({length}, (struct type *) {recv_type_info}->unanchored_table->types[HASH({recv_type_info}->unanchored_table->mask, {mtype.const_color})])", mtype)
+                               return self.new_expr("NEW_{mtype.mclass.c_name}({length}, {recv_type_info}->resolution_table->types[HASH({recv_type_info}->resolution_table->mask, {mtype.const_color})])", mtype)
                        else
-                               return self.new_expr("NEW_{mtype.mclass.c_name}({length}, (struct type *) {recv_type_info}->unanchored_table->types[{mtype.const_color}])", mtype)
+                               return self.new_expr("NEW_{mtype.mclass.c_name}({length}, {recv_type_info}->resolution_table->types[{mtype.const_color}])", mtype)
                        end
                end
                compiler.undead_types.add(mtype)
-               return self.new_expr("NEW_{mtype.mclass.c_name}({length}, (struct type *) &type_{mtype.c_name})", mtype)
+               self.require_declaration("type_{mtype.c_name}")
+               return self.new_expr("NEW_{mtype.mclass.c_name}({length}, &type_{mtype.c_name})", mtype)
        end
 
        redef fun native_array_def(pname, ret_type, arguments)
@@ -1543,16 +1478,40 @@ class SeparateCompilerVisitor
                self.ret(res)
        end
 
-       fun link_unanchored_type(mclassdef: MClassDef, mtype: MType) do
+       fun link_unresolved_type(mclassdef: MClassDef, mtype: MType) do
                assert mtype.need_anchor
                var compiler = self.compiler
-               if not compiler.live_unanchored_types.has_key(self.frame.mpropdef.mclassdef) then
-                       compiler.live_unanchored_types[self.frame.mpropdef.mclassdef] = new HashSet[MType]
+               if not compiler.live_unresolved_types.has_key(self.frame.mpropdef.mclassdef) then
+                       compiler.live_unresolved_types[self.frame.mpropdef.mclassdef] = new HashSet[MType]
                end
-               compiler.live_unanchored_types[self.frame.mpropdef.mclassdef].add(mtype)
+               compiler.live_unresolved_types[self.frame.mpropdef.mclassdef].add(mtype)
        end
 end
 
+redef class MMethodDef
+       fun separate_runtime_function: AbstractRuntimeFunction
+       do
+               var res = self.separate_runtime_function_cache
+               if res == null then
+                       res = new SeparateRuntimeFunction(self)
+                       self.separate_runtime_function_cache = res
+               end
+               return res
+       end
+       private var separate_runtime_function_cache: nullable SeparateRuntimeFunction
+
+       fun virtual_runtime_function: AbstractRuntimeFunction
+       do
+               var res = self.virtual_runtime_function_cache
+               if res == null then
+                       res = new VirtualRuntimeFunction(self)
+                       self.virtual_runtime_function_cache = res
+               end
+               return res
+       end
+       private var virtual_runtime_function_cache: nullable VirtualRuntimeFunction
+end
+
 # The C function associated to a methoddef separately compiled
 class SeparateRuntimeFunction
        super AbstractRuntimeFunction
@@ -1587,7 +1546,7 @@ class SeparateRuntimeFunction
                end
                sig.append(self.c_name)
                sig.append("({selfvar.mtype.ctype} {selfvar}")
-               comment.append("(self: {selfvar}")
+               comment.append("({selfvar}: {selfvar.mtype}")
                arguments.add(selfvar)
                for i in [0..msignature.arity[ do
                        var mtype = msignature.mparameters[i].mtype
@@ -1604,7 +1563,7 @@ class SeparateRuntimeFunction
                if ret != null then
                        comment.append(": {ret}")
                end
-               compiler.header.add_decl("{sig};")
+               compiler.provide_declaration(self.c_name, "{sig};")
 
                v.add_decl("/* method {self} for {comment} */")
                v.add_decl("{sig} \{")
@@ -1663,7 +1622,7 @@ class VirtualRuntimeFunction
                end
                sig.append(self.c_name)
                sig.append("({selfvar.mtype.ctype} {selfvar}")
-               comment.append("(self: {selfvar}")
+               comment.append("({selfvar}: {selfvar.mtype}")
                arguments.add(selfvar)
                for i in [0..msignature.arity[ do
                        var mtype = msignature.mparameters[i].mtype
@@ -1680,7 +1639,7 @@ class VirtualRuntimeFunction
                if ret != null then
                        comment.append(": {ret}")
                end
-               compiler.header.add_decl("{sig};")
+               compiler.provide_declaration(self.c_name, "{sig};")
 
                v.add_decl("/* method {self} for {comment} */")
                v.add_decl("{sig} \{")
@@ -1689,10 +1648,11 @@ class VirtualRuntimeFunction
                end
                frame.returnlabel = v.get_name("RET_LABEL")
 
-               if recv != arguments.first.mtype then
-                       #print "{self} {recv} {arguments.first}"
+               var subret = v.call(mmethoddef, recv, arguments)
+               if ret != null then
+                       assert subret != null
+                       v.assign(frame.returnvar.as(not null), subret)
                end
-               mmethoddef.compile_inside_to_c(v, arguments)
 
                v.add("{frame.returnlabel.as(not null)}:;")
                if ret != null then