X-Git-Url: http://nitlanguage.org

diff --git a/src/abstract_compiler.nit b/src/abstract_compiler.nit
index 4ef429f..e5cba5c 100644
--- a/src/abstract_compiler.nit
+++ b/src/abstract_compiler.nit
@@ -20,8 +20,6 @@ module abstract_compiler
 import literal
 import typing
 import auto_super_init
-import frontend
-import common_ffi
 import platform
 import c_tools
 
@@ -43,8 +41,8 @@ redef class ToolContext
 	var opt_no_shortcut_range: OptionBool = new OptionBool("Always insantiate a range and its iterator on 'for' loops", "--no-shortcut-range")
 	# --no-check-covariance
 	var opt_no_check_covariance: OptionBool = new OptionBool("Disable type tests of covariant parameters (dangerous)", "--no-check-covariance")
-	# --no-check-initialization
-	var opt_no_check_initialization: OptionBool = new OptionBool("Disable isset tests at the end of constructors (dangerous)", "--no-check-initialization")
+	# --no-check-attr-isset
+	var opt_no_check_attr_isset: OptionBool = new OptionBool("Disable isset tests before each attribute access (dangerous)", "--no-check-attr-isset")
 	# --no-check-assert
 	var opt_no_check_assert: OptionBool = new OptionBool("Disable the evaluation of explicit 'assert' and 'as' (dangerous)", "--no-check-assert")
 	# --no-check-autocast
@@ -53,33 +51,43 @@ redef class ToolContext
 	var opt_no_check_other: OptionBool = new OptionBool("Disable implicit tests: unset attribute, null receiver (dangerous)", "--no-check-other")
 	# --typing-test-metrics
 	var opt_typing_test_metrics: OptionBool = new OptionBool("Enable static and dynamic count of all type tests", "--typing-test-metrics")
-	# --no-stacktrace
-	var opt_no_stacktrace: OptionBool = new OptionBool("Disables libunwind and generation of C stack traces (can be problematic when compiling to targets such as Android or NaCl)", "--no-stacktrace")
-	# --stack-trace-C-to-Nit-name-binding
-	var opt_stacktrace: OptionBool = new OptionBool("Enables the use of gperf to bind C to Nit function names when encountering a Stack trace at runtime", "--nit-stacktrace")
+	# --invocation-metrics
+	var opt_invocation_metrics: OptionBool = new OptionBool("Enable static and dynamic count of all method invocations", "--invocation-metrics")
+	# --isset-checks-metrics
+	var opt_isset_checks_metrics: OptionBool = new OptionBool("Enable static and dynamic count of isset checks before attributes access", "--isset-checks-metrics")
+	# --stacktrace
+	var opt_stacktrace: OptionString = new OptionString("Control the generation of stack traces", "--stacktrace")
+	# --no-gcc-directives
+	var opt_no_gcc_directive = new OptionArray("Disable a advanced gcc directives for optimization", "--no-gcc-directive")
 
 	redef init
 	do
 		super
 		self.option_context.add_option(self.opt_output, self.opt_no_cc, self.opt_make_flags, self.opt_compile_dir, self.opt_hardening, self.opt_no_shortcut_range)
-		self.option_context.add_option(self.opt_no_check_covariance, self.opt_no_check_initialization, self.opt_no_check_assert, self.opt_no_check_autocast, self.opt_no_check_other)
-		self.option_context.add_option(self.opt_typing_test_metrics)
+		self.option_context.add_option(self.opt_no_check_covariance, self.opt_no_check_attr_isset, self.opt_no_check_assert, self.opt_no_check_autocast, self.opt_no_check_other)
+		self.option_context.add_option(self.opt_typing_test_metrics, self.opt_invocation_metrics, self.opt_isset_checks_metrics)
 		self.option_context.add_option(self.opt_stacktrace)
-		self.option_context.add_option(self.opt_no_stacktrace)
+		self.option_context.add_option(self.opt_no_gcc_directive)
 	end
-end
 
-redef class ModelBuilder
-	redef init(model, toolcontext)
+	redef fun process_options(args)
 	do
-		if toolcontext.opt_no_stacktrace.value and toolcontext.opt_stacktrace.value then
-			print "Cannot use --nit-stacktrace when --no-stacktrace is activated"
+		super
+
+		var st = opt_stacktrace.value
+		if st == null or st == "none" or st == "libunwind" or st == "nitstack" then
+			# Fine, do nothing
+		else if st == "auto" then
+			# Default just unset
+			opt_stacktrace.value = null
+		else
+			print "Error: unknown value `{st}` for --stacktrace. Use `none`, `libunwind`, `nitstack` or `auto`."
 			exit(1)
 		end
-
-		super
 	end
+end
 
+redef class ModelBuilder
 	# The compilation directory
 	var compile_dir: String
 
@@ -121,22 +129,19 @@ class MakefileToolchain
 	# The list is initially set with :
 	#   * the toolcontext --cc-path option
 	#   * the NIT_CC_PATH environment variable
-	#   * some heuristics including the NIT_DIR environment variable and the progname of the process
+	#   * `toolcontext.nit_dir`
 	# Path can be added (or removed) by the client
 	var cc_paths = new Array[String]
 
 	protected fun gather_cc_paths
 	do
 		# Look for the the Nit clib path
-		var path_env = "NIT_DIR".environ
-		if not path_env.is_empty then
+		var path_env = toolcontext.nit_dir
+		if path_env != null then
 			var libname = "{path_env}/clib"
 			if libname.file_exists then cc_paths.add(libname)
 		end
 
-		var libname = "{sys.program_name.dirname}/../clib"
-		if libname.file_exists then cc_paths.add(libname.simplify_path)
-
 		if cc_paths.is_empty then
 			toolcontext.error(null, "Cannot determine the nit clib path. define envvar NIT_DIR.")
 		end
@@ -190,7 +195,7 @@ class MakefileToolchain
 
 	fun write_files(compiler: AbstractCompiler, compile_dir: String, cfiles: Array[String])
 	do
-		if self.toolcontext.opt_stacktrace.value then compiler.build_c_to_nit_bindings
+		if self.toolcontext.opt_stacktrace.value == "nitstack" then compiler.build_c_to_nit_bindings
 
 		# Add gc_choser.h to aditionnal bodies
 		var gc_chooser = new ExternCFile("gc_chooser.c", "-DWITH_LIBGC")
@@ -200,11 +205,8 @@ class MakefileToolchain
 
 		# FFI
 		var m2m = toolcontext.modelbuilder.mmodule2nmodule
-		for m in compiler.mainmodule.in_importation.greaters do if m2m.keys.has(m) then
-			var amodule = m2m[m]
-			if m.uses_ffi or amodule.uses_legacy_ni then
-				compiler.finalize_ffi_for_module(amodule)
-			end
+		for m in compiler.mainmodule.in_importation.greaters do
+			compiler.finalize_ffi_for_module(m)
 		end
 
 		# Copy original .[ch] files to compile_dir
@@ -303,12 +305,13 @@ class MakefileToolchain
 
 		var linker_options = new HashSet[String]
 		var m2m = toolcontext.modelbuilder.mmodule2nmodule
-		for m in mainmodule.in_importation.greaters do if m2m.keys.has(m) then
-			var amod = m2m[m]
-			linker_options.add(amod.c_linker_options)
+		for m in mainmodule.in_importation.greaters do
+			var libs = m.collect_linker_libs
+			if libs != null then linker_options.add_all(libs)
 		end
 
-		if not toolcontext.opt_no_stacktrace.value then linker_options.add("-lunwind")
+		var ost = toolcontext.opt_stacktrace.value
+		if ost == "libunwind" or ost == "nitstack" then linker_options.add("-lunwind")
 
 		makefile.write("CC = ccache cc\nCFLAGS = -g -O2\nCINCL = {cc_includes}\nLDFLAGS ?= \nLDLIBS  ?= -lm -lgc {linker_options.join(" ")}\n\n")
 		makefile.write("all: {outpath}\n\n")
@@ -318,11 +321,13 @@ class MakefileToolchain
 		# Compile each generated file
 		for f in cfiles do
 			var o = f.strip_extension(".c") + ".o"
-			makefile.write("{o}: {f}\n\t$(CC) $(CFLAGS) $(CINCL) -D NONITCNI -c -o {o} {f}\n\n")
+			makefile.write("{o}: {f}\n\t$(CC) $(CFLAGS) $(CINCL) -c -o {o} {f}\n\n")
 			ofiles.add(o)
 			dep_rules.add(o)
 		end
 
+		var java_files = new Array[ExternFile]
+
 		# Compile each required extern body into a specific .o
 		for f in compiler.extern_bodies do
 			var o = f.makefile_rule_name
@@ -330,7 +335,21 @@ class MakefileToolchain
 			makefile.write("{o}: {ff}\n")
 			makefile.write("\t{f.makefile_rule_content}\n\n")
 			dep_rules.add(f.makefile_rule_name)
-			ofiles.add(o)
+
+			if f.compiles_to_o_file then ofiles.add(o)
+			if f.add_to_jar then java_files.add(f)
+		end
+		
+		if not java_files.is_empty then
+			var jar_file = "{outpath}.jar"
+
+			var class_files_array = new Array[String]
+			for f in java_files do class_files_array.add(f.makefile_rule_name)
+			var class_files = class_files_array.join(" ")
+
+			makefile.write("{jar_file}: {class_files}\n")
+			makefile.write("\tjar cf {jar_file} {class_files}\n\n")
+			dep_rules.add jar_file
 		end
 
 		# Link edition
@@ -426,30 +445,40 @@ abstract class AbstractCompiler
 	do
 		var compile_dir = modelbuilder.compile_dir
 
-		var stream = new OFStream.open("{compile_dir}/C_fun_names")
-		stream.write("%\{\n#include \"c_functions_hash.h\"\n%\}\n")
-		stream.write("%define lookup-function-name get_nit_name\n")
-		stream.write("struct C_Nit_Names;\n")
-		stream.write("%%\n")
-		stream.write("####\n")
+		var stream = new OFStream.open("{compile_dir}/c_functions_hash.c")
+		stream.write("#include <string.h>\n")
+		stream.write("#include <stdlib.h>\n")
+		stream.write("#include \"c_functions_hash.h\"\n")
+		stream.write("typedef struct C_Nit_Names\{char* name; char* nit_name;\}C_Nit_Names;\n")
+		stream.write("const char* get_nit_name(register const char* procproc, register unsigned int len)\{\n")
+		stream.write("char* procname = malloc(len+1);")
+		stream.write("memcpy(procname, procproc, len);")
+		stream.write("procname[len] = '\\0';")
+		stream.write("static const C_Nit_Names map[{names.length}] = \{\n")
 		for i in names.keys do
+			stream.write("\{\"")
 			stream.write(i)
-			stream.write(",\t\"")
+			stream.write("\",\"")
 			stream.write(names[i])
-			stream.write("\"\n")
-		end
-		stream.write("####\n")
-		stream.write("%%\n")
+			stream.write("\"\},\n")
+		end
+		stream.write("\};\n")
+		stream.write("int i;")
+		stream.write("for(i = 0; i < {names.length}; i++)\{")
+		stream.write("if(strcmp(procname,map[i].name) == 0)\{")
+		stream.write("free(procname);")
+		stream.write("return map[i].nit_name;")
+		stream.write("\}")
+		stream.write("\}")
+		stream.write("free(procname);")
+		stream.write("return NULL;")
+		stream.write("\}\n")
 		stream.close
 
 		stream = new OFStream.open("{compile_dir}/c_functions_hash.h")
-		stream.write("typedef struct C_Nit_Names\{char* name; char* nit_name;\}C_Nit_Names;\n")
-		stream.write("const struct C_Nit_Names* get_nit_name(register const char *str, register unsigned int len);\n")
+		stream.write("const char* get_nit_name(register const char* procname, register unsigned int len);\n")
 		stream.close
 
-		var x = new Process("gperf","{compile_dir}/C_fun_names","-t","-7","--output-file={compile_dir}/c_functions_hash.c","-C")
-		x.wait
-
 		extern_bodies.add(new ExternCFile("{compile_dir}/c_functions_hash.c", ""))
 	end
 
@@ -466,8 +495,26 @@ abstract class AbstractCompiler
 		compile_header_structs
 		compile_nitni_structs
 
-		# Signal handler function prototype
-		self.header.add_decl("void show_backtrace(int);")
+		var gccd_disable = modelbuilder.toolcontext.opt_no_gcc_directive.value
+		if gccd_disable.has("noreturn") or gccd_disable.has("all") then
+			# Signal handler function prototype
+			self.header.add_decl("void show_backtrace(int);")
+		else
+			self.header.add_decl("void show_backtrace(int) __attribute__ ((noreturn));")
+		end
+
+		if gccd_disable.has("likely") or gccd_disable.has("all") then
+			self.header.add_decl("#define likely(x)       (x)")
+			self.header.add_decl("#define unlikely(x)     (x)")
+		else if gccd_disable.has("correct-likely") then
+			# invert the `likely` definition
+			# Used by masochists to bench the worst case
+			self.header.add_decl("#define likely(x)       __builtin_expect((x),0)")
+			self.header.add_decl("#define unlikely(x)     __builtin_expect((x),1)")
+		else
+			self.header.add_decl("#define likely(x)       __builtin_expect((x),1)")
+			self.header.add_decl("#define unlikely(x)     __builtin_expect((x),0)")
+		end
 
 		# Global variable used by intern methods
 		self.header.add_decl("extern int glob_argc;")
@@ -489,13 +536,20 @@ abstract class AbstractCompiler
 	fun compile_main_function
 	do
 		var v = self.new_visitor
-		if modelbuilder.toolcontext.opt_stacktrace.value then
-			v.add_decl("#include \"c_functions_hash.h\"")
-		end
 		v.add_decl("#include <signal.h>")
-		if not modelbuilder.toolcontext.opt_no_stacktrace.value then
+		var ost = modelbuilder.toolcontext.opt_stacktrace.value
+
+		if ost == null then
+			ost = "nitstack"
+			modelbuilder.toolcontext.opt_stacktrace.value = ost
+		end
+
+		if ost == "nitstack" or ost == "libunwind" then
 			v.add_decl("#define UNW_LOCAL_ONLY")
 			v.add_decl("#include <libunwind.h>")
+			if ost == "nitstack" then
+				v.add_decl("#include \"c_functions_hash.h\"")
+			end
 		end
 		v.add_decl("int glob_argc;")
 		v.add_decl("char **glob_argv;")
@@ -512,13 +566,29 @@ abstract class AbstractCompiler
 			end
 		end
 
+		if self.modelbuilder.toolcontext.opt_invocation_metrics.value then
+			v.add_decl("long count_invoke_by_tables;")
+			v.add_decl("long count_invoke_by_direct;")
+			v.add_decl("long count_invoke_by_inline;")
+			v.compiler.header.add_decl("extern long count_invoke_by_tables;")
+			v.compiler.header.add_decl("extern long count_invoke_by_direct;")
+			v.compiler.header.add_decl("extern long count_invoke_by_inline;")
+		end
+
+		if self.modelbuilder.toolcontext.opt_isset_checks_metrics.value then
+			v.add_decl("long count_attr_reads = 0;")
+			v.add_decl("long count_isset_checks = 0;")
+			v.compiler.header.add_decl("extern long count_attr_reads;")
+			v.compiler.header.add_decl("extern long count_isset_checks;")
+		end
+
 		v.add_decl("void sig_handler(int signo)\{")
 		v.add_decl("printf(\"Caught signal : %s\\n\", strsignal(signo));")
 		v.add_decl("show_backtrace(signo);")
 		v.add_decl("\}")
 
 		v.add_decl("void show_backtrace (int signo) \{")
-		if not modelbuilder.toolcontext.opt_no_stacktrace.value then
+		if ost == "nitstack" or ost == "libunwind" then
 			v.add_decl("char* opt = getenv(\"NIT_NO_STACK\");")
 			v.add_decl("unw_cursor_t cursor;")
 			v.add_decl("if(opt==NULL)\{")
@@ -532,10 +602,10 @@ abstract class AbstractCompiler
 			v.add_decl("printf(\"-------------------------------------------------\\n\");")
 			v.add_decl("while (unw_step(&cursor) > 0) \{")
 			v.add_decl("	unw_get_proc_name(&cursor, procname, 100, &ip);")
-			if modelbuilder.toolcontext.opt_stacktrace.value then
-			v.add_decl("	const C_Nit_Names* recv = get_nit_name(procname, strlen(procname));")
-			v.add_decl("	if (recv != 0)\{")
-			v.add_decl("		printf(\"` %s\\n\", recv->nit_name);")
+			if ost == "nitstack" then
+			v.add_decl("	const char* recv = get_nit_name(procname, strlen(procname));")
+			v.add_decl("	if (recv != NULL)\{")
+			v.add_decl("		printf(\"` %s\\n\", recv);")
 			v.add_decl("	\}else\{")
 			v.add_decl("		printf(\"` %s\\n\", procname);")
 			v.add_decl("	\}")
@@ -603,6 +673,20 @@ abstract class AbstractCompiler
 			end
 		end
 
+		if self.modelbuilder.toolcontext.opt_invocation_metrics.value then
+			v.add_decl("long count_invoke_total;")
+			v.add("count_invoke_total = count_invoke_by_tables + count_invoke_by_direct + count_invoke_by_inline;")
+			v.add("printf(\"# dynamic count_invocation: total %ld\\n\", count_invoke_total);")
+			v.add("printf(\"by table: %ld (%.2f%%)\\n\", count_invoke_by_tables, 100.0*count_invoke_by_tables/count_invoke_total);")
+			v.add("printf(\"direct:   %ld (%.2f%%)\\n\", count_invoke_by_direct, 100.0*count_invoke_by_direct/count_invoke_total);")
+			v.add("printf(\"inlined:  %ld (%.2f%%)\\n\", count_invoke_by_inline, 100.0*count_invoke_by_inline/count_invoke_total);")
+		end
+
+		if self.modelbuilder.toolcontext.opt_isset_checks_metrics.value then
+			v.add("printf(\"# dynamic attribute reads: %ld\\n\", count_attr_reads);")
+			v.add("printf(\"# dynamic isset checks: %ld\\n\", count_isset_checks);")
+		end
+
 		v.add("return 0;")
 		v.add("\}")
 	end
@@ -700,6 +784,8 @@ abstract class AbstractCompiler
 		end
 	end
 
+	fun finalize_ffi_for_module(mmodule: MModule) do mmodule.finalize_ffi(self)
+
 	# Division facility
 	# Avoid division by zero by returning the string "n/a"
 	fun div(a,b:Int):String
@@ -707,13 +793,6 @@ abstract class AbstractCompiler
 		if b == 0 then return "n/a"
 		return ((a*10000/b).to_f / 100.0).to_precision(2)
 	end
-
-	fun finalize_ffi_for_module(nmodule: AModule)
-	do
-		var visitor = new_visitor
-		nmodule.finalize_ffi(visitor, modelbuilder)
-		nmodule.finalize_nitni(visitor)
-	end
 end
 
 # A file unit (may be more than one file if
@@ -924,7 +1003,7 @@ abstract class AbstractCompilerVisitor
 
 		var maybenull = recv.mcasttype isa MNullableType or recv.mcasttype isa MNullType
 		if maybenull then
-			self.add("if ({recv} == NULL) \{")
+			self.add("if (unlikely({recv} == NULL)) \{")
 			self.add_abort("Receiver is null")
 			self.add("\}")
 		end
@@ -1143,7 +1222,7 @@ abstract class AbstractCompilerVisitor
 	fun add_cast(value: RuntimeVariable, mtype: MType, tag: String)
 	do
 		var res = self.type_test(value, mtype, tag)
-		self.add("if (!{res}) \{")
+		self.add("if (unlikely(!{res})) \{")
 		var cn = self.class_name_string(value)
 		self.add("fprintf(stderr, \"Runtime error: Cast failed. Expected `%s`, got `%s`\", \"{mtype.to_s.escape_to_c}\", {cn});")
 		self.add_raw_abort
@@ -1466,6 +1545,7 @@ redef class MMethodDef
 	# Can the body be inlined?
 	fun can_inline(v: VISITOR): Bool
 	do
+		if is_abstract then return true
 		var modelbuilder = v.compiler.modelbuilder
 		if modelbuilder.mpropdef2npropdef.has_key(self) then
 			var npropdef = modelbuilder.mpropdef2npropdef[self]
@@ -1538,13 +1618,16 @@ redef class APropdef
 	fun can_inline: Bool do return true
 end
 
-redef class AConcreteMethPropdef
+redef class AMethPropdef
 	redef fun compile_to_c(v, mpropdef, arguments)
 	do
-		for i in [0..mpropdef.msignature.arity[ do
-			var variable = self.n_signature.n_params[i].variable.as(not null)
-			v.assign(v.variable(variable), arguments[i+1])
+		if mpropdef.is_abstract then
+			var cn = v.class_name_string(arguments.first)
+			v.add("fprintf(stderr, \"Runtime error: Abstract method `%s` called on `%s`\", \"{mpropdef.mproperty.name.escape_to_c}\", {cn});")
+			v.add_raw_abort
+			return
 		end
+
 		# Call the implicit super-init
 		var auto_super_inits = self.auto_super_inits
 		if auto_super_inits != null then
@@ -1557,7 +1640,23 @@ redef class AConcreteMethPropdef
 				v.compile_callsite(auto_super_init, args)
 			end
 		end
-		v.stmt(self.n_block)
+
+		var n_block = n_block
+		if n_block != null then
+			for i in [0..mpropdef.msignature.arity[ do
+				var variable = self.n_signature.n_params[i].variable.as(not null)
+				v.assign(v.variable(variable), arguments[i+1])
+			end
+			v.stmt(n_block)
+		else if mpropdef.is_intern then
+			compile_intern_to_c(v, mpropdef, arguments)
+		else if mpropdef.is_extern then
+			if mpropdef.mproperty.is_init then
+				compile_externinit_to_c(v, mpropdef, arguments)
+			else
+				compile_externmeth_to_c(v, mpropdef, arguments)
+			end
+		end
 	end
 
 	redef fun can_inline
@@ -1569,10 +1668,8 @@ redef class AConcreteMethPropdef
 		if nblock isa ABlockExpr and nblock.n_expr.length == 0 then return true
 		return false
 	end
-end
 
-redef class AInternMethPropdef
-	redef fun compile_to_c(v, mpropdef, arguments)
+	fun compile_intern_to_c(v: AbstractCompilerVisitor, mpropdef: MMethodDef, arguments: Array[RuntimeVariable])
 	do
 		var pname = mpropdef.mproperty.name
 		var cname = mpropdef.mclassdef.mclass.name
@@ -1599,12 +1696,6 @@ redef class AInternMethPropdef
 			else if pname == "unary -" then
 				v.ret(v.new_expr("-{arguments[0]}", ret.as(not null)))
 				return
-			else if pname == "succ" then
-				v.ret(v.new_expr("{arguments[0]}+1", ret.as(not null)))
-				return
-			else if pname == "prec" then
-				v.ret(v.new_expr("{arguments[0]}-1", ret.as(not null)))
-				return
 			else if pname == "*" then
 				v.ret(v.new_expr("{arguments[0]} * {arguments[1]}", ret.as(not null)))
 				return
@@ -1653,10 +1744,10 @@ redef class AInternMethPropdef
 			else if pname == "object_id" then
 				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
 				return
-			else if pname == "+" then
+			else if pname == "successor" then
 				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
 				return
-			else if pname == "-" then
+			else if pname == "predecessor" then
 				v.ret(v.new_expr("{arguments[0]} - {arguments[1]}", ret.as(not null)))
 				return
 			else if pname == "==" then
@@ -1666,12 +1757,6 @@ redef class AInternMethPropdef
 				var res = v.equal_test(arguments[0], arguments[1])
 				v.ret(v.new_expr("!{res}", ret.as(not null)))
 				return
-			else if pname == "succ" then
-				v.ret(v.new_expr("{arguments[0]}+1", ret.as(not null)))
-				return
-			else if pname == "prec" then
-				v.ret(v.new_expr("{arguments[0]}-1", ret.as(not null)))
-				return
 			else if pname == "<" then
 				v.ret(v.new_expr("{arguments[0]} < {arguments[1]}", ret.as(not null)))
 				return
@@ -1817,10 +1902,8 @@ redef class AInternMethPropdef
 		v.add("printf(\"NOT YET IMPLEMENTED {class_name}:{mpropdef} at {location.to_s}\\n\");")
 		debug("Not implemented {mpropdef}")
 	end
-end
 
-redef class AExternMethPropdef
-	redef fun compile_to_c(v, mpropdef, arguments)
+	fun compile_externmeth_to_c(v: AbstractCompilerVisitor, mpropdef: MMethodDef, arguments: Array[RuntimeVariable])
 	do
 		var externname
 		var nextern = self.n_extern
@@ -1849,10 +1932,8 @@ redef class AExternMethPropdef
 			v.ret(res)
 		end
 	end
-end
 
-redef class AExternInitPropdef
-	redef fun compile_to_c(v, mpropdef, arguments)
+	fun compile_externinit_to_c(v: AbstractCompilerVisitor, mpropdef: MMethodDef, arguments: Array[RuntimeVariable])
 	do
 		var externname
 		var nextern = self.n_extern
@@ -1948,15 +2029,6 @@ redef class AClassdef
 	end
 end
 
-redef class ADeferredMethPropdef
-	redef fun compile_to_c(v, mpropdef, arguments) do
-		var cn = v.class_name_string(arguments.first)
-		v.add("fprintf(stderr, \"Runtime error: Abstract method `%s` called on `%s`\", \"{mpropdef.mproperty.name.escape_to_c}\", {cn});")
-		v.add_raw_abort
-	end
-	redef fun can_inline do return true
-end
-
 redef class AExpr
 	# Try to compile self as an expression
 	# Do not call this method directly, use `v.expr` instead
@@ -2225,7 +2297,7 @@ redef class AAssertExpr
 		if v.compiler.modelbuilder.toolcontext.opt_no_check_assert.value then return
 
 		var cond = v.expr_bool(self.n_expr)
-		v.add("if (!{cond}) \{")
+		v.add("if (unlikely(!{cond})) \{")
 		v.stmt(self.n_else)
 		var nid = self.n_id
 		if nid != null then
@@ -2410,7 +2482,7 @@ redef class AAsNotnullExpr
 		var i = v.expr(self.n_expr, null)
 		if v.compiler.modelbuilder.toolcontext.opt_no_check_assert.value then return i
 
-		v.add("if ({i} == NULL) \{")
+		v.add("if (unlikely({i} == NULL)) \{")
 		v.add_abort("Cast failed")
 		v.add("\}")
 		return i
@@ -2614,15 +2686,11 @@ redef class MModule
 		return properties_cache[mclass]
 	end
 	private var properties_cache: Map[MClass, Set[MProperty]] = new HashMap[MClass, Set[MProperty]]
-end
-
-redef class AModule
-	# Does this module use the legacy native interface?
-	fun uses_legacy_ni: Bool is abstract
 
-	# Write FFI results to file
-	fun finalize_ffi(v: AbstractCompilerVisitor, modelbuilder: ModelBuilder) is abstract
+	# Write FFI and nitni results to file
+	fun finalize_ffi(c: AbstractCompiler) do end
 
-	# Write nitni results to file
-	fun finalize_nitni(v: AbstractCompilerVisitor) is abstract
+	# Give requided addinional system libraries (as given to LD_LIBS)
+	# Note: can return null instead of an empty set
+	fun collect_linker_libs: nullable Set[String] do return null
 end