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

diff --git a/src/compiler/abstract_compiler.nit b/src/compiler/abstract_compiler.nit
index 4ea22d5..224de8b 100644
--- a/src/compiler/abstract_compiler.nit
+++ b/src/compiler/abstract_compiler.nit
@@ -28,15 +28,15 @@ import counter
 # Add compiling options
 redef class ToolContext
 	# --output
-	var opt_output = new OptionString("Output file", "-o", "--output")
+	var opt_output = new OptionString("Filename of the generated executable", "-o", "--output")
 	# --dir
 	var opt_dir = new OptionString("Output directory", "--dir")
 	# --no-cc
-	var opt_no_cc = new OptionBool("Do not invoke C compiler", "--no-cc")
+	var opt_no_cc = new OptionBool("Do not invoke the C compiler", "--no-cc")
 	# --no-main
 	var opt_no_main = new OptionBool("Do not generate main entry point", "--no-main")
 	# --make-flags
-	var opt_make_flags = new OptionString("Additional options to make", "--make-flags")
+	var opt_make_flags = new OptionString("Additional options to the `make` command", "--make-flags")
 	# --max-c-lines
 	var opt_max_c_lines = new OptionInt("Maximum number of lines in generated C files. Use 0 for unlimited", 10000, "--max-c-lines")
 	# --group-c-files
@@ -50,7 +50,7 @@ redef class ToolContext
 	# --no-check-attr-isset
 	var opt_no_check_attr_isset = new OptionBool("Disable isset tests before each attribute access (dangerous)", "--no-check-attr-isset")
 	# --no-check-assert
-	var opt_no_check_assert = new OptionBool("Disable the evaluation of explicit 'assert' and 'as' (dangerous)", "--no-check-assert")
+	var opt_no_check_assert = new OptionBool("Disable the evaluation of explicit `assert` and `as` (dangerous)", "--no-check-assert")
 	# --no-check-autocast
 	var opt_no_check_autocast = new OptionBool("Disable implicit casts on unsafe expression usage (dangerous)", "--no-check-autocast")
 	# --no-check-null
@@ -63,12 +63,14 @@ redef class ToolContext
 	var opt_invocation_metrics = new OptionBool("Enable static and dynamic count of all method invocations", "--invocation-metrics")
 	# --isset-checks-metrics
 	var opt_isset_checks_metrics = new OptionBool("Enable static and dynamic count of isset checks before attributes access", "--isset-checks-metrics")
-	# --stacktrace
-	var opt_stacktrace = new OptionString("Control the generation of stack traces", "--stacktrace")
+	# --no-stacktrace
+	var opt_no_stacktrace = new OptionBool("Disable the generation of stack traces", "--no-stacktrace")
 	# --no-gcc-directives
-	var opt_no_gcc_directive = new OptionArray("Disable a advanced gcc directives for optimization", "--no-gcc-directive")
+	var opt_no_gcc_directive = new OptionArray("Disable advanced gcc directives for optimization", "--no-gcc-directive")
 	# --release
 	var opt_release = new OptionBool("Compile in release mode and finalize application", "--release")
+	# -g
+	var opt_debug = new OptionBool("Compile in debug mode (no C-side optimization)", "-g", "--debug")
 
 	redef init
 	do
@@ -76,10 +78,11 @@ redef class ToolContext
 		self.option_context.add_option(self.opt_output, self.opt_dir, self.opt_no_cc, self.opt_no_main, self.opt_make_flags, self.opt_compile_dir, self.opt_hardening)
 		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_null, self.opt_no_check_all)
 		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)
 		self.option_context.add_option(self.opt_release)
 		self.option_context.add_option(self.opt_max_c_lines, self.opt_group_c_files)
+		self.option_context.add_option(self.opt_debug)
 
 		opt_no_main.hidden = true
 	end
@@ -88,17 +91,6 @@ redef class ToolContext
 	do
 		super
 
-		var st = opt_stacktrace.value
-		if st == "none" or st == "libunwind" or st == "nitstack" then
-			# Fine, do nothing
-		else if st == "auto" or st == null then
-			# Default is nitstack
-			opt_stacktrace.value = "nitstack"
-		else
-			print "Option Error: unknown value `{st}` for --stacktrace. Use `none`, `libunwind`, `nitstack` or `auto`."
-			exit(1)
-		end
-
 		if opt_output.value != null and opt_dir.value != null then
 			print "Option Error: cannot use both --dir and --output"
 			exit(1)
@@ -115,15 +107,12 @@ redef class ToolContext
 end
 
 redef class ModelBuilder
-	# The compilation directory
-	var compile_dir: String
-
 	# Simple indirection to `Toolchain::write_and_make`
 	protected fun write_and_make(compiler: AbstractCompiler)
 	do
 		var platform = compiler.target_platform
 		var toolchain = platform.toolchain(toolcontext, compiler)
-		compile_dir = toolchain.compile_dir
+		compiler.toolchain = toolchain
 		toolchain.write_and_make
 	end
 end
@@ -145,14 +134,21 @@ class Toolchain
 	# Compiler of the target program
 	var compiler: AbstractCompiler
 
-	# Directory where to generate all C files
-	fun compile_dir: String
+	# Directory where to generate all files
+	#
+	# The option `--compile_dir` change this directory.
+	fun root_compile_dir: String
 	do
 		var compile_dir = toolcontext.opt_compile_dir.value
-		if compile_dir == null then compile_dir = ".nit_compile"
+		if compile_dir == null then compile_dir = "nit_compile"
 		return compile_dir
 	end
 
+	# Directory where to generate all C files
+	#
+	# By default it is `root_compile_dir` but some platform may require that it is a subdirectory.
+	fun compile_dir: String do return root_compile_dir
+
 	# Write all C files and compile them
 	fun write_and_make is abstract
 end
@@ -163,14 +159,21 @@ class MakefileToolchain
 
 	redef fun write_and_make
 	do
+		var debug = toolcontext.opt_debug.value
 		var compile_dir = compile_dir
 
+		# Remove the compilation directory unless explicitly set
+		var auto_remove = toolcontext.opt_compile_dir.value == null
+		# If debug flag is set, do not remove sources
+		if debug then auto_remove = false
+
 		# Generate the .h and .c files
 		# A single C file regroups many compiled rumtime functions
 		# Note that we do not try to be clever an a small change in a Nit source file may change the content of all the generated .c files
 		var time0 = get_time
 		self.toolcontext.info("*** WRITING C ***", 1)
 
+		root_compile_dir.mkdir
 		compile_dir.mkdir
 
 		var cfiles = new Array[String]
@@ -192,6 +195,10 @@ class MakefileToolchain
 
 		compile_c_code(compile_dir)
 
+		if auto_remove then
+			sys.system("rm -r -- '{root_compile_dir.escape_to_sh}/'")
+		end
+
 		time1 = get_time
 		self.toolcontext.info("*** END COMPILING C: {time1-time0} ***", 2)
 	end
@@ -219,7 +226,7 @@ class MakefileToolchain
 
 		# Copy original .[ch] files to compile_dir
 		for src in compiler.files_to_copy do
-			var basename = src.basename("")
+			var basename = src.basename
 			var dst = "{compile_dir}/{basename}"
 			src.file_copy_to dst
 		end
@@ -327,7 +334,7 @@ class MakefileToolchain
 		var outpath = real_outpath.escape_to_mk
 		if outpath != real_outpath then
 			# If the name is crazy and need escaping, we will do an indirection
-			# 1. generate the binary in the .nit_compile dir under an escaped name
+			# 1. generate the binary in the nit_compile dir under an escaped name
 			# 2. copy the binary at the right place in the `all` goal.
 			outpath = mainmodule.c_name
 		end
@@ -340,28 +347,82 @@ class MakefileToolchain
 			var libs = m.collect_linker_libs
 			if libs != null then linker_options.add_all(libs)
 		end
-
-		makefile.write("CC = ccache cc\nCXX = ccache c++\nCFLAGS = -g -O2 -Wno-unused-value -Wno-switch -Wno-attributes\nCINCL =\nLDFLAGS ?= \nLDLIBS  ?= -lm {linker_options.join(" ")}\n\n")
-
-		var ost = toolcontext.opt_stacktrace.value
-		if (ost == "libunwind" or ost == "nitstack") and platform.supports_libunwind then makefile.write("NEED_LIBUNWIND := YesPlease\n")
+		var debug = toolcontext.opt_debug.value
+
+		makefile.write """
+CC = ccache cc
+CXX = ccache c++
+CFLAGS = -g {{{if not debug then "-O2" else ""}}} -Wno-unused-value -Wno-switch -Wno-attributes -Wno-trigraphs
+CINCL =
+LDFLAGS ?=
+LDLIBS  ?= -lm {{{linker_options.join(" ")}}}
+\n"""
+
+		makefile.write "\n# SPECIAL CONFIGURATION FLAGS\n"
+		if platform.supports_libunwind then
+			if toolcontext.opt_no_stacktrace.value then
+				makefile.write "NO_STACKTRACE=True"
+			else
+				makefile.write "NO_STACKTRACE= # Set to `True` to enable"
+			end
+		end
 
 		# Dynamic adaptations
 		# While `platform` enable complex toolchains, they are statically applied
 		# For a dynamic adaptsation of the compilation, the generated Makefile should check and adapt things itself
+		makefile.write "\n\n"
 
 		# Check and adapt the targeted system
 		makefile.write("uname_S := $(shell sh -c 'uname -s 2>/dev/null || echo not')\n")
-		makefile.write("ifeq ($(uname_S),Darwin)\n")
-		# remove -lunwind since it is already included on macosx
-		makefile.write("\tNEED_LIBUNWIND :=\n")
-		makefile.write("endif\n\n")
 
 		# Check and adapt for the compiler used
 		# clang need an additionnal `-Qunused-arguments`
 		makefile.write("clang_check := $(shell sh -c '$(CC) -v 2>&1 | grep -q clang; echo $$?')\nifeq ($(clang_check), 0)\n\tCFLAGS += -Qunused-arguments\nendif\n")
 
-		makefile.write("ifdef NEED_LIBUNWIND\n\tLDLIBS += -lunwind\nendif\n")
+		if platform.supports_libunwind then
+			makefile.write """
+ifneq ($(NO_STACKTRACE), True)
+  # Check and include lib-unwind in a portable way
+  ifneq ($(uname_S),Darwin)
+    # already included on macosx, but need to get the correct flags in other supported platforms.
+    ifeq ($(shell pkg-config --exists 'libunwind'; echo $$?), 0)
+      LDLIBS += `pkg-config --libs libunwind`
+      CFLAGS += `pkg-config --cflags libunwind`
+    else
+      $(warning "[_] stack-traces disabled. Please install libunwind-dev.")
+      CFLAGS += -D NO_STACKTRACE
+    endif
+  endif
+else
+  # Stacktraces disabled
+  CFLAGS += -D NO_STACKTRACE
+endif
+
+"""
+		else
+			makefile.write("CFLAGS += -D NO_STACKTRACE\n\n")
+		end
+
+		makefile.write """
+# Special configuration for Darwin
+ifeq ($(uname_S),Darwin)
+	# Remove POSIX flag -lrt
+	LDLIBS := $(filter-out -lrt,$(LDLIBS))
+endif
+
+# Special configuration for Windows under mingw64
+ifeq ($(uname_S),MINGW64_NT-10.0)
+	# Use the pcreposix regex library
+	LDLIBS += -lpcreposix
+
+	# Remove POSIX flag -lrt
+	LDLIBS := $(filter-out -lrt,$(LDLIBS))
+
+	# Silence warnings when storing Int, Char and Bool as pointer address
+	CFLAGS += -Wno-pointer-to-int-cast -Wno-int-to-pointer-cast
+endif
+
+"""
 
 		makefile.write("all: {outpath}\n")
 		if outpath != real_outpath then
@@ -418,7 +479,7 @@ endif
 		# Compile each required extern body into a specific .o
 		for f in compiler.extern_bodies do
 			var o = f.makefile_rule_name
-			var ff = f.filename.basename("")
+			var ff = f.filename.basename
 			makefile.write("{o}: {ff}\n")
 			makefile.write("\t{f.makefile_rule_content}\n\n")
 			dep_rules.add(f.makefile_rule_name)
@@ -470,6 +531,8 @@ endif
 		var res
 		if self.toolcontext.verbose_level >= 3 then
 			res = sys.system("{command} 2>&1")
+		else if is_windows then
+			res = sys.system("{command} 2>&1 >nul")
 		else
 			res = sys.system("{command} 2>&1 >/dev/null")
 		end
@@ -496,6 +559,11 @@ abstract class AbstractCompiler
 	# The modelbuilder used to know the model and the AST
 	var modelbuilder: ModelBuilder is protected writable
 
+	# The associated toolchain
+	#
+	# Set by `modelbuilder.write_and_make` and permit sub-routines to access the current toolchain if required.
+	var toolchain: Toolchain is noinit
+
 	# Is hardening asked? (see --hardening)
 	fun hardening: Bool do return self.modelbuilder.toolcontext.opt_hardening.value
 
@@ -530,7 +598,7 @@ abstract class AbstractCompiler
 
 	# The list of all associated files
 	# Used to generate .c files
-	var files = new List[CodeFile]
+	var files = new Array[CodeFile]
 
 	# Initialize a visitor specific for a compiler engine
 	fun new_visitor: VISITOR is abstract
@@ -559,7 +627,7 @@ abstract class AbstractCompiler
 	# Binds the generated C function names to Nit function names
 	fun build_c_to_nit_bindings
 	do
-		var compile_dir = modelbuilder.compile_dir
+		var compile_dir = toolchain.compile_dir
 
 		var stream = new FileWriter.open("{compile_dir}/c_functions_hash.c")
 		stream.write("#include <string.h>\n")
@@ -604,18 +672,44 @@ abstract class AbstractCompiler
 		self.header.add_decl("#include <stdlib.h>")
 		self.header.add_decl("#include <stdio.h>")
 		self.header.add_decl("#include <string.h>")
+		# longjmp !
+		self.header.add_decl("#include <setjmp.h>\n")
 		self.header.add_decl("#include <sys/types.h>\n")
 		self.header.add_decl("#include <unistd.h>\n")
+		self.header.add_decl("#include <stdint.h>\n")
+		self.header.add_decl("#ifdef __linux__")
+		self.header.add_decl("	#include <endian.h>")
+		self.header.add_decl("#endif")
+		self.header.add_decl("#include <inttypes.h>\n")
 		self.header.add_decl("#include \"gc_chooser.h\"")
+		self.header.add_decl("#ifdef __APPLE__")
+		self.header.add_decl("	#include <TargetConditionals.h>")
+		self.header.add_decl("	#include <syslog.h>")
+		self.header.add_decl("	#include <libkern/OSByteOrder.h>")
+		self.header.add_decl("	#define be32toh(x) OSSwapBigToHostInt32(x)")
+		self.header.add_decl("#endif")
+		self.header.add_decl("#ifdef _WIN32")
+		self.header.add_decl("	#define be32toh(val) _byteswap_ulong(val)")
+		self.header.add_decl("#endif")
+		self.header.add_decl("#ifdef __pnacl__")
+		self.header.add_decl("	#define be16toh(val) (((val) >> 8) | ((val) << 8))")
+		self.header.add_decl("	#define be32toh(val) ((be16toh((val) << 16) | (be16toh((val) >> 16))))")
+		self.header.add_decl("#endif")
 		self.header.add_decl("#ifdef ANDROID")
+		self.header.add_decl("	#ifndef be32toh")
+		self.header.add_decl("		#define be32toh(val) betoh32(val)")
+		self.header.add_decl("	#endif")
 		self.header.add_decl("	#include <android/log.h>")
 		self.header.add_decl("	#define PRINT_ERROR(...) (void)__android_log_print(ANDROID_LOG_WARN, \"Nit\", __VA_ARGS__)")
+		self.header.add_decl("#elif TARGET_OS_IPHONE")
+		self.header.add_decl("	#define PRINT_ERROR(...) syslog(LOG_ERR, __VA_ARGS__)")
 		self.header.add_decl("#else")
 		self.header.add_decl("	#define PRINT_ERROR(...) fprintf(stderr, __VA_ARGS__)")
 		self.header.add_decl("#endif")
 
 		compile_header_structs
 		compile_nitni_structs
+		compile_catch_stack
 
 		var gccd_disable = modelbuilder.toolcontext.opt_no_gcc_directive.value
 		if gccd_disable.has("noreturn") or gccd_disable.has("all") then
@@ -644,6 +738,17 @@ abstract class AbstractCompiler
 		self.header.add_decl("extern val *glob_sys;")
 	end
 
+	# Stack stocking environment for longjumps
+	protected fun compile_catch_stack do
+		self.header.add_decl """
+struct catch_stack_t {
+	int cursor;
+	jmp_buf envs[100];
+};
+extern struct catch_stack_t catchStack;
+"""
+	end
+
 	# Declaration of structures for live Nit types
 	protected fun compile_header_structs is abstract
 
@@ -702,6 +807,20 @@ extern void nitni_global_ref_decr( struct nitni_ref *ref );
 		v.add "\}"
 	end
 
+	# Hook to add specif piece of code before the the main C function.
+	#
+	# Is called by `compile_main_function`
+	fun compile_before_main(v: VISITOR)
+	do
+	end
+
+	# Hook to add specif piece of code at the begin on the main C function.
+	#
+	# Is called by `compile_main_function`
+	fun compile_begin_main(v: VISITOR)
+	do
+	end
+
 	# Generate the main C function.
 	#
 	# This function:
@@ -718,13 +837,16 @@ extern void nitni_global_ref_decr( struct nitni_ref *ref );
 		var no_main = platform.no_main or modelbuilder.toolcontext.opt_no_main.value
 
 		if platform.supports_libunwind then
+			v.add_decl("#ifndef NO_STACKTRACE")
 			v.add_decl("#define UNW_LOCAL_ONLY")
 			v.add_decl("#include <libunwind.h>")
 			v.add_decl("#include \"c_functions_hash.h\"")
+			v.add_decl("#endif")
 		end
 		v.add_decl("int glob_argc;")
 		v.add_decl("char **glob_argv;")
 		v.add_decl("val *glob_sys;")
+		v.add_decl("struct catch_stack_t catchStack;")
 
 		if self.modelbuilder.toolcontext.opt_typing_test_metrics.value then
 			for tag in count_type_test_tags do
@@ -755,6 +877,7 @@ extern void nitni_global_ref_decr( struct nitni_ref *ref );
 
 		v.add_decl("static void show_backtrace(void) \{")
 		if platform.supports_libunwind then
+			v.add_decl("#ifndef NO_STACKTRACE")
 			v.add_decl("char* opt = getenv(\"NIT_NO_STACK\");")
 			v.add_decl("unw_cursor_t cursor;")
 			v.add_decl("if(opt==NULL)\{")
@@ -778,15 +901,22 @@ extern void nitni_global_ref_decr( struct nitni_ref *ref );
 			v.add_decl("PRINT_ERROR(\"-------------------------------------------------\\n\");")
 			v.add_decl("free(procname);")
 			v.add_decl("\}")
+			v.add_decl("#endif /* NO_STACKTRACE */")
 		end
 		v.add_decl("\}")
 
 		v.add_decl("void sig_handler(int signo)\{")
+		v.add_decl "#ifdef _WIN32"
+		v.add_decl "PRINT_ERROR(\"Caught signal : %s\\n\", signo);"
+		v.add_decl "#else"
 		v.add_decl("PRINT_ERROR(\"Caught signal : %s\\n\", strsignal(signo));")
+		v.add_decl "#endif"
 		v.add_decl("show_backtrace();")
 		# rethrows
 		v.add_decl("signal(signo, SIG_DFL);")
+		v.add_decl "#ifndef _WIN32"
 		v.add_decl("kill(getpid(), signo);")
+		v.add_decl "#endif"
 		v.add_decl("\}")
 
 		v.add_decl("void fatal_exit(int status) \{")
@@ -794,21 +924,30 @@ extern void nitni_global_ref_decr( struct nitni_ref *ref );
 		v.add_decl("exit(status);")
 		v.add_decl("\}")
 
+		compile_before_main(v)
+
 		if no_main then
 			v.add_decl("int nit_main(int argc, char** argv) \{")
 		else
 			v.add_decl("int main(int argc, char** argv) \{")
 		end
 
+		compile_begin_main(v)
+
+		v.add "#if !defined(__ANDROID__) && !defined(TARGET_OS_IPHONE)"
 		v.add("signal(SIGABRT, sig_handler);")
 		v.add("signal(SIGFPE, sig_handler);")
 		v.add("signal(SIGILL, sig_handler);")
 		v.add("signal(SIGINT, sig_handler);")
 		v.add("signal(SIGTERM, sig_handler);")
 		v.add("signal(SIGSEGV, sig_handler);")
-		v.add("signal(SIGPIPE, sig_handler);")
+		v.add "#endif"
+		v.add "#ifndef _WIN32"
+		v.add("signal(SIGPIPE, SIG_IGN);")
+		v.add "#endif"
 
 		v.add("glob_argc = argc; glob_argv = argv;")
+		v.add("catchStack.cursor = -1;")
 		v.add("initialize_gc_option();")
 
 		v.add "initialize_nitni_global_refs();"
@@ -1031,25 +1170,41 @@ extern void nitni_global_ref_decr( struct nitni_ref *ref ) {
 	fun finalize_ffi_for_module(mmodule: MModule) do mmodule.finalize_ffi(self)
 end
 
-# A file unit (may be more than one file if
-# A file unit aim to be autonomous and is made or one or more `CodeWriter`s
+# C code file generated from the `writers` and the `required_declarations`
+#
+# A file unit aims to be autonomous and is made or one or more `CodeWriter`s.
 class CodeFile
+	# Basename of the file, will be appended by `.h` and `.c`
 	var name: String
+
+	# `CodeWriter` used in sequence to fill the top of the body, then the bottom
 	var writers = new Array[CodeWriter]
+
+	# Required declarations keys
+	#
+	# See: `provide_declaration`
 	var required_declarations = new HashSet[String]
 end
 
-# Where to store generated lines
+# Store generated lines
+#
+# Instances are added to `file.writers` at construction.
 class CodeWriter
+	# Parent `CodeFile`
 	var file: CodeFile
-	var lines: List[String] = new List[String]
-	var decl_lines: List[String] = new List[String]
 
-	# Add a line in the main part of the generated C
+	# Main lines of code (written at the bottom of the body)
+	var lines = new Array[String]
+
+	# Lines of code for declarations (written at the top of the body)
+	var decl_lines = new Array[String]
+
+	# Add a line in the main lines of code (to `lines`)
 	fun add(s: String) do self.lines.add(s)
 
-	# Add a line in the
-	# (used for local or global declaration)
+	# Add a declaration line (to `decl_lines`)
+	#
+	# Used for local and global declaration.
 	fun add_decl(s: String) do self.decl_lines.add(s)
 
 	init
@@ -1094,6 +1249,7 @@ abstract class AbstractCompilerVisitor
 
 	fun compile_callsite(callsite: CallSite, arguments: Array[RuntimeVariable]): nullable RuntimeVariable
 	do
+		if callsite.is_broken then return null
 		var initializers = callsite.mpropdef.initializers
 		if not initializers.is_empty then
 			var recv = arguments.first
@@ -1122,9 +1278,7 @@ abstract class AbstractCompilerVisitor
 
 	fun native_array_instance(elttype: MType, length: RuntimeVariable): RuntimeVariable is abstract
 
-	fun calloc_array(ret_type: MType, arguments: Array[RuntimeVariable]) is abstract
-
-	fun native_array_def(pname: String, ret_type: nullable MType, arguments: Array[RuntimeVariable]) is abstract
+	fun native_array_def(pname: String, ret_type: nullable MType, arguments: Array[RuntimeVariable]): Bool do return false
 
 	# Return an element of a native array.
 	# The method is unsafe and is just a direct wrapper for the specific implementation of native arrays
@@ -1134,6 +1288,16 @@ abstract class AbstractCompilerVisitor
 	# The method is unsafe and is just a direct wrapper for the specific implementation of native arrays
 	fun native_array_set(native_array: RuntimeVariable, index: Int, value: RuntimeVariable) is abstract
 
+	# Allocate `size` bytes with the low_level `nit_alloc` C function
+	#
+	# This method can be redefined to inject statistic or tracing code.
+	#
+	# `tag` if any, is used to mark the class of the allocated object.
+	fun nit_alloc(size: String, tag: nullable String): String
+	do
+		return "nit_alloc({size})"
+	end
+
 	# Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
 	# This method is used to manage varargs in signatures and returns the real array
 	# of runtime variables to use in the call.
@@ -1168,8 +1332,8 @@ abstract class AbstractCompilerVisitor
 				res.add(null_instance)
 				continue
 			end
-			if param.is_vararg and map.vararg_decl > 0 then
-				var vararg = exprs.sub(j, map.vararg_decl)
+			if param.is_vararg and args[i].vararg_decl > 0 then
+				var vararg = exprs.sub(j, args[i].vararg_decl)
 				var elttype = param.mtype
 				var arg = self.vararg_instance(mpropdef, recv, vararg, elttype)
 				res.add(arg)
@@ -1203,17 +1367,21 @@ abstract class AbstractCompilerVisitor
 	do
 		mtype = self.anchor(mtype)
 		var valmtype = value.mcasttype
+
+		# Do nothing if useless autocast
 		if valmtype.is_subtype(self.compiler.mainmodule, null, mtype) then
 			return value
 		end
 
+		# Just as_not_null if the target is not nullable.
+		#
+		# eg `nullable PreciseType` adapted to `Object` gives precisetype.
 		if valmtype isa MNullableType and valmtype.mtype.is_subtype(self.compiler.mainmodule, null, mtype) then
-			var res = new RuntimeVariable(value.name, valmtype, valmtype.mtype)
-			return res
-		else
-			var res = new RuntimeVariable(value.name, valmtype, mtype)
-			return res
+			mtype = valmtype.mtype
 		end
+
+		var res = new RuntimeVariable(value.name, value.mtype, mtype)
+		return res
 	end
 
 	# Generate a super call from a method definition
@@ -1281,13 +1449,18 @@ abstract class AbstractCompilerVisitor
 
 	# Checks
 
+	# Can value be null? (according to current knowledge)
+	fun maybenull(value: RuntimeVariable): Bool
+	do
+		return value.mcasttype isa MNullableType or value.mcasttype isa MNullType
+	end
+
 	# Add a check and an abort for a null receiver if needed
 	fun check_recv_notnull(recv: RuntimeVariable)
 	do
 		if self.compiler.modelbuilder.toolcontext.opt_no_check_null.value then return
 
-		var maybenull = recv.mcasttype isa MNullableType or recv.mcasttype isa MNullType
-		if maybenull then
+		if maybenull(recv) then
 			self.add("if (unlikely({recv} == NULL)) \{")
 			self.add_abort("Receiver is null")
 			self.add("\}")
@@ -1339,7 +1512,7 @@ abstract class AbstractCompilerVisitor
 	end
 
 	# Return a "const char*" variable associated to the classname of the dynamic type of an object
-	# NOTE: we do not return a `RuntimeVariable` "NativeString" as the class may not exist in the module/program
+	# NOTE: we do not return a `RuntimeVariable` "CString" as the class may not exist in the module/program
 	fun class_name_string(value: RuntimeVariable): String is abstract
 
 	# Variables handling
@@ -1446,12 +1619,64 @@ abstract class AbstractCompilerVisitor
 		return res
 	end
 
+	# Generate a byte value
+	fun byte_instance(value: Byte): RuntimeVariable
+	do
+		var t = mmodule.byte_type
+		var res = new RuntimeVariable("((unsigned char){value.to_s})", t, t)
+		return res
+	end
+
+	# Generate an int8 value
+	fun int8_instance(value: Int8): RuntimeVariable
+	do
+		var t = mmodule.int8_type
+		var res = new RuntimeVariable("INT8_C({value.to_s})", t, t)
+		return res
+	end
+
+	# Generate an int16 value
+	fun int16_instance(value: Int16): RuntimeVariable
+	do
+		var t = mmodule.int16_type
+		var res = new RuntimeVariable("INT16_C({value.to_s})", t, t)
+		return res
+	end
+
+	# Generate a uint16 value
+	fun uint16_instance(value: UInt16): RuntimeVariable
+	do
+		var t = mmodule.uint16_type
+		var res = new RuntimeVariable("UINT16_C({value.to_s})", t, t)
+		return res
+	end
+
+	# Generate an int32 value
+	fun int32_instance(value: Int32): RuntimeVariable
+	do
+		var t = mmodule.int32_type
+		var res = new RuntimeVariable("INT32_C({value.to_s})", t, t)
+		return res
+	end
+
+	# Generate a uint32 value
+	fun uint32_instance(value: UInt32): RuntimeVariable
+	do
+		var t = mmodule.uint32_type
+		var res = new RuntimeVariable("UINT32_C({value.to_s})", t, t)
+		return res
+	end
+
 	# Generate a char value
 	fun char_instance(value: Char): RuntimeVariable
 	do
 		var t = mmodule.char_type
-		var res = new RuntimeVariable("'{value.to_s.escape_to_c}'", t, t)
-		return res
+
+		if value.code_point < 128 then
+			return new RuntimeVariable("'{value.to_s.escape_to_c}'", t, t)
+		else
+			return new RuntimeVariable("{value.code_point}", t, t)
+		end
 	end
 
 	# Generate a float value
@@ -1480,6 +1705,18 @@ abstract class AbstractCompilerVisitor
 		return res
 	end
 
+	# Generates a CString instance fully escaped in C-style \xHH fashion
+	fun c_string_instance(ns: CString, len: Int): RuntimeVariable do
+		var mtype = mmodule.c_string_type
+		var nat = new_var(mtype)
+		var byte_esc = new Buffer.with_cap(len * 4)
+		for i in [0 .. len[ do
+			byte_esc.append("\\x{ns[i].to_s.substring_from(2)}")
+		end
+		self.add("{nat} = \"{byte_esc}\";")
+		return nat
+	end
+
 	# Generate a string value
 	fun string_instance(string: String): RuntimeVariable
 	do
@@ -1490,11 +1727,12 @@ abstract class AbstractCompilerVisitor
 		self.add("if (likely({name}!=NULL)) \{")
 		self.add("{res} = {name};")
 		self.add("\} else \{")
-		var native_mtype = mmodule.native_string_type
+		var native_mtype = mmodule.c_string_type
 		var nat = self.new_var(native_mtype)
 		self.add("{nat} = \"{string.escape_to_c}\";")
-		var length = self.int_instance(string.length)
-		self.add("{res} = {self.send(self.get_property("to_s_with_length", native_mtype), [nat, length]).as(not null)};")
+		var byte_length = self.int_instance(string.byte_length)
+		var unilen = self.int_instance(string.length)
+		self.add("{res} = {self.send(self.get_property("to_s_unsafe", native_mtype), [nat, byte_length, unilen, value_instance(false), value_instance(false)]).as(not null)};")
 		self.add("{name} = {res};")
 		self.add("\}")
 		return res
@@ -1550,16 +1788,16 @@ abstract class AbstractCompilerVisitor
 	# This is used for the legacy FFI
 	fun add_extern(mmodule: MModule)
 	do
-		var file = mmodule.location.file.filename
+		var file = mmodule.filepath
 		file = file.strip_extension(".nit")
 		var tryfile = file + ".nit.h"
 		if tryfile.file_exists then
-			self.declare_once("#include \"{tryfile.basename("")}\"")
+			self.declare_once("#include \"{tryfile.basename}\"")
 			self.compiler.files_to_copy.add(tryfile)
 		end
 		tryfile = file + "_nit.h"
 		if tryfile.file_exists then
-			self.declare_once("#include \"{tryfile.basename("")}\"")
+			self.declare_once("#include \"{tryfile.basename}\"")
 			self.compiler.files_to_copy.add(tryfile)
 		end
 
@@ -1570,7 +1808,7 @@ abstract class AbstractCompilerVisitor
 			tryfile = file + "_nit.c"
 			if not tryfile.file_exists then return
 		end
-		var f = new ExternCFile(tryfile.basename(""), "")
+		var f = new ExternCFile(tryfile.basename, "")
 		self.compiler.extern_bodies.add(f)
 		self.compiler.files_to_copy.add(tryfile)
 	end
@@ -1587,6 +1825,9 @@ abstract class AbstractCompilerVisitor
 	# used by aborts, asserts, casts, etc.
 	fun add_abort(message: String)
 	do
+		self.add("if(catchStack.cursor >= 0)\{")
+		self.add("longjmp(catchStack.envs[catchStack.cursor], 1);")
+		self.add("\}")
 		self.add("PRINT_ERROR(\"Runtime error: %s\", \"{message.escape_to_c}\");")
 		add_raw_abort
 	end
@@ -1626,10 +1867,11 @@ abstract class AbstractCompilerVisitor
 	fun stmt(nexpr: nullable AExpr)
 	do
 		if nexpr == null then return
-		if nexpr.mtype == null and not nexpr.is_typed then
+		if nexpr.is_broken then
 			# Untyped expression.
-			# Might mean dead code
-			# So just return
+			# Might mean dead code or invalid code
+			# so aborts
+			add_abort("FATAL: bad statement executed.")
 			return
 		end
 
@@ -1651,16 +1893,27 @@ abstract class AbstractCompilerVisitor
 	# `mtype` is the expected return type, pass null if no specific type is expected.
 	fun expr(nexpr: AExpr, mtype: nullable MType): RuntimeVariable
 	do
-		if nexpr.mtype == null then
+		var old = self.current_node
+		self.current_node = nexpr
+
+		var res = null
+		if nexpr.mtype != null then
+			res = nexpr.expr(self)
+		end
+
+		if res == null then
 			# Untyped expression.
-			# Might mean dead code
-			# so return a placebo result
+			# Might mean dead code or invalid code.
+			# so aborts
+			add_abort("FATAL: bad expression executed.")
+			# and return a placebo result to please the C compiler
 			if mtype == null then mtype = compiler.mainmodule.object_type
-			return new_var(mtype)
+			res = new_var(mtype)
+
+			self.current_node = old
+			return res
 		end
-		var old = self.current_node
-		self.current_node = nexpr
-		var res = nexpr.expr(self).as(not null)
+
 		if mtype != null then
 			mtype = self.anchor(mtype)
 			res = self.autobox(res, mtype)
@@ -1826,10 +2079,22 @@ redef class MClassType
 		else if mclass.name == "Bool" then
 			return "short int"
 		else if mclass.name == "Char" then
-			return "char"
+			return "uint32_t"
 		else if mclass.name == "Float" then
 			return "double"
-		else if mclass.name == "NativeString" then
+		else if mclass.name == "Int8" then
+			return "int8_t"
+		else if mclass.name == "Byte" then
+			return "unsigned char"
+		else if mclass.name == "Int16" then
+			return "int16_t"
+		else if mclass.name == "UInt16" then
+			return "uint16_t"
+		else if mclass.name == "Int32" then
+			return "int32_t"
+		else if mclass.name == "UInt32" then
+			return "uint32_t"
+		else if mclass.name == "CString" then
 			return "char*"
 		else if mclass.name == "NativeArray" then
 			return "val*"
@@ -1859,7 +2124,19 @@ redef class MClassType
 			return "c"
 		else if mclass.name == "Float" then
 			return "d"
-		else if mclass.name == "NativeString" then
+		else if mclass.name == "Int8" then
+			return "i8"
+		else if mclass.name == "Byte" then
+			return "b"
+		else if mclass.name == "Int16" then
+			return "i16"
+		else if mclass.name == "UInt16" then
+			return "u16"
+		else if mclass.name == "Int32" then
+			return "i32"
+		else if mclass.name == "UInt32" then
+			return "u32"
+		else if mclass.name == "CString" then
 			return "str"
 		else if mclass.name == "NativeArray" then
 			#return "{self.arguments.first.ctype}*"
@@ -1879,6 +2156,7 @@ redef class MMethodDef
 	fun can_inline(v: VISITOR): Bool
 	do
 		if is_abstract then return true
+		if constant_value != null then return true
 		var modelbuilder = v.compiler.modelbuilder
 		var node = modelbuilder.mpropdef2node(self)
 		if node isa APropdef then
@@ -1886,6 +2164,8 @@ redef class MMethodDef
 		else if node isa AClassdef then
 			# Automatic free init is always inlined since it is empty or contains only attribtes assigments
 			return true
+		else if node == null then
+			return true
 		else
 			abort
 		end
@@ -1931,20 +2211,23 @@ redef class MMethodDef
 	do
 		if v.compiler.modelbuilder.toolcontext.opt_no_check_covariance.value then return
 
+		var msignature = self.msignature.as(not null)
+
 		for i in [0..msignature.arity[ do
+			var mp = msignature.mparameters[i]
 			# skip test for vararg since the array is instantiated with the correct polymorphic type
-			if msignature.vararg_rank == i then continue
+			if mp.is_vararg then continue
 
 			# skip if the cast is not required
 			var origmtype =  self.mproperty.intro.msignature.mparameters[i].mtype
 			if not origmtype.need_anchor then continue
 
 			# get the parameter type
-			var mtype = self.msignature.mparameters[i].mtype
+			var mtype = mp.mtype
 
 			# generate the cast
 			# note that v decides if and how to implements the cast
-			v.add("/* Covariant cast for argument {i} ({self.msignature.mparameters[i].name}) {arguments[i+1].inspect} isa {mtype} */")
+			v.add("/* Covariant cast for argument {i} ({mp.name}) {arguments[i+1].inspect} isa {mtype} */")
 			v.add_cast(arguments[i+1], mtype, "covariance")
 		end
 	end
@@ -1986,7 +2269,8 @@ redef class AMethPropdef
 		# Try special compilation
 		if mpropdef.is_intern then
 			if compile_intern_to_c(v, mpropdef, arguments) then return
-		else if mpropdef.is_extern then
+		end
+		if mpropdef.is_extern then
 			if mpropdef.mproperty.is_init then
 				if compile_externinit_to_c(v, mpropdef, arguments) then return
 			else
@@ -2061,12 +2345,6 @@ redef class AMethPropdef
 			else if pname == "%" then
 				v.ret(v.new_expr("{arguments[0]} % {arguments[1]}", ret.as(not null)))
 				return true
-			else if pname == "lshift" then
-				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
-				return true
-			else if pname == "rshift" then
-				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
-				return true
 			else if pname == "==" then
 				v.ret(v.equal_test(arguments[0], arguments[1]))
 				return true
@@ -2086,18 +2364,45 @@ redef class AMethPropdef
 			else if pname == ">=" then
 				v.ret(v.new_expr("{arguments[0]} >= {arguments[1]}", ret.as(not null)))
 				return true
+			else if pname == "to_i8" then
+				v.ret(v.new_expr("(int8_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i16" then
+				v.ret(v.new_expr("(int16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u16" then
+				v.ret(v.new_expr("(uint16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i32" then
+				v.ret(v.new_expr("(int32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u32" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
 			else if pname == "to_f" then
 				v.ret(v.new_expr("(double){arguments[0]}", ret.as(not null)))
 				return true
-			else if pname == "ascii" then
-				v.ret(v.new_expr("{arguments[0]}", ret.as(not null)))
+			else if pname == "to_b" then
+				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "code_point" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "&" then
+				v.ret(v.new_expr("{arguments[0]} & {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "|" then
+				v.ret(v.new_expr("{arguments[0]} | {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">>" then
+				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<<" then
+				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
 				return true
 			end
 		else if cname == "Char" then
-			if pname == "output" then
-				v.add("printf(\"%c\", {arguments.first});")
-				return true
-			else if pname == "object_id" then
+			if pname == "object_id" then
 				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
 				return true
 			else if pname == "successor" then
@@ -2128,8 +2433,89 @@ redef class AMethPropdef
 			else if pname == "to_i" then
 				v.ret(v.new_expr("{arguments[0]}-'0'", ret.as(not null)))
 				return true
+			else if pname == "code_point" then
+				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
+				return true
+			end
+		else if cname == "Byte" then
+			if pname == "output" then
+				v.add("printf(\"%x\\n\", {arguments.first});")
+				return true
+			else if pname == "object_id" then
+				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
+				return true
+			else if pname == "+" then
+				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "-" then
+				v.ret(v.new_expr("{arguments[0]} - {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary -" then
+				v.ret(v.new_expr("-{arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "unary +" then
+				v.ret(arguments[0])
+				return true
+			else if pname == "*" then
+				v.ret(v.new_expr("{arguments[0]} * {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "/" then
+				v.ret(v.new_expr("{arguments[0]} / {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "%" then
+				v.ret(v.new_expr("{arguments[0]} % {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "==" then
+				v.ret(v.equal_test(arguments[0], arguments[1]))
+				return true
+			else if pname == "!=" then
+				var res = v.equal_test(arguments[0], arguments[1])
+				v.ret(v.new_expr("!{res}", ret.as(not null)))
+				return true
+			else if pname == "<" then
+				v.ret(v.new_expr("{arguments[0]} < {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">" then
+				v.ret(v.new_expr("{arguments[0]} > {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<=" then
+				v.ret(v.new_expr("{arguments[0]} <= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">=" then
+				v.ret(v.new_expr("{arguments[0]} >= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">>" then
+				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<<" then
+				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "&" then
+				v.ret(v.new_expr("{arguments[0]} & {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "to_i" then
+				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_f" then
+				v.ret(v.new_expr("(double){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i8" then
+				v.ret(v.new_expr("(int8_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i16" then
+				v.ret(v.new_expr("(int16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u16" then
+				v.ret(v.new_expr("(uint16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i32" then
+				v.ret(v.new_expr("(int32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u32" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
 			else if pname == "ascii" then
-				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
 				return true
 			end
 		else if cname == "Bool" then
@@ -2200,13 +2586,31 @@ redef class AMethPropdef
 			else if pname == "to_i" then
 				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
 				return true
+			else if pname == "to_b" then
+				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i8" then
+				v.ret(v.new_expr("(int8_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i16" then
+				v.ret(v.new_expr("(int16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u16" then
+				v.ret(v.new_expr("(uint16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i32" then
+				v.ret(v.new_expr("(int32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u32" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
 			end
-		else if cname == "NativeString" then
+		else if cname == "CString" then
 			if pname == "[]" then
-				v.ret(v.new_expr("{arguments[0]}[{arguments[1]}]", ret.as(not null)))
+				v.ret(v.new_expr("(unsigned char)((int){arguments[0]}[{arguments[1]}])", ret.as(not null)))
 				return true
 			else if pname == "[]=" then
-				v.add("{arguments[0]}[{arguments[1]}]={arguments[2]};")
+				v.add("{arguments[0]}[{arguments[1]}]=(unsigned char){arguments[2]};")
 				return true
 			else if pname == "copy_to" then
 				v.add("memmove({arguments[1]}+{arguments[4]},{arguments[0]}+{arguments[3]},{arguments[2]});")
@@ -2217,44 +2621,486 @@ redef class AMethPropdef
 			else if pname == "fast_cstring" then
 				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
 				return true
+			else if pname == "==" then
+				v.ret(v.equal_test(arguments[0], arguments[1]))
+				return true
+			else if pname == "!=" then
+				var res = v.equal_test(arguments[0], arguments[1])
+				v.ret(v.new_expr("!{res}", ret.as(not null)))
+				return true
 			else if pname == "new" then
-				v.ret(v.new_expr("(char*)nit_alloc({arguments[1]})", ret.as(not null)))
+				var alloc = v.nit_alloc(arguments[1].to_s, "CString")
+				v.ret(v.new_expr("(char*){alloc}", ret.as(not null)))
+				return true
+			else if pname == "fetch_4_chars" then
+				v.ret(v.new_expr("*((uint32_t*)({arguments[0]} + {arguments[1]}))", ret.as(not null)))
+				return true
+			else if pname == "fetch_4_hchars" then
+				v.ret(v.new_expr("(uint32_t)be32toh(*((uint32_t*)({arguments[0]} + {arguments[1]})))", ret.as(not null)))
 				return true
 			end
 		else if cname == "NativeArray" then
-			v.native_array_def(pname, ret, arguments)
-			return true
-		end
-		if pname == "exit" then
-			v.add("exit({arguments[1]});")
-			return true
-		else if pname == "sys" then
-			v.ret(v.new_expr("glob_sys", ret.as(not null)))
-			return true
-		else if pname == "calloc_string" then
-			v.ret(v.new_expr("(char*)nit_alloc({arguments[1]})", ret.as(not null)))
-			return true
-		else if pname == "calloc_array" then
-			v.calloc_array(ret.as(not null), arguments)
-			return true
-		else if pname == "object_id" then
-			v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
-			return true
-		else if pname == "is_same_type" then
-			v.ret(v.is_same_type_test(arguments[0], arguments[1]))
-			return true
-		else if pname == "is_same_instance" then
-			v.ret(v.equal_test(arguments[0], arguments[1]))
-			return true
-		else if pname == "output_class_name" then
-			var nat = v.class_name_string(arguments.first)
-			v.add("printf(\"%s\\n\", {nat});")
-			return true
-		else if pname == "native_class_name" then
-			var nat = v.class_name_string(arguments.first)
-			v.ret(v.new_expr("(char*){nat}", ret.as(not null)))
-			return true
-		else if pname == "force_garbage_collection" then
+			return v.native_array_def(pname, ret, arguments)
+		else if cname == "Int8" then
+			if pname == "output" then
+				v.add("printf(\"%\"PRIi8 \"\\n\", {arguments.first});")
+				return true
+			else if pname == "object_id" then
+				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
+				return true
+			else if pname == "+" then
+				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "-" then
+				v.ret(v.new_expr("{arguments[0]} - {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary -" then
+				v.ret(v.new_expr("-{arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "unary +" then
+				v.ret(arguments[0])
+				return true
+			else if pname == "*" then
+				v.ret(v.new_expr("{arguments[0]} * {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "/" then
+				v.ret(v.new_expr("{arguments[0]} / {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "%" then
+				v.ret(v.new_expr("{arguments[0]} % {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<<" then
+				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">>" then
+				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "==" then
+				v.ret(v.equal_test(arguments[0], arguments[1]))
+				return true
+			else if pname == "!=" then
+				var res = v.equal_test(arguments[0], arguments[1])
+				v.ret(v.new_expr("!{res}", ret.as(not null)))
+				return true
+			else if pname == "<" then
+				v.ret(v.new_expr("{arguments[0]} < {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">" then
+				v.ret(v.new_expr("{arguments[0]} > {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<=" then
+				v.ret(v.new_expr("{arguments[0]} <= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">=" then
+				v.ret(v.new_expr("{arguments[0]} >= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "to_i" then
+				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_b" then
+				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i16" then
+				v.ret(v.new_expr("(int16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u16" then
+				v.ret(v.new_expr("(uint16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i32" then
+				v.ret(v.new_expr("(int32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u32" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_f" then
+				v.ret(v.new_expr("(double){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "&" then
+				v.ret(v.new_expr("{arguments[0]} & {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "|" then
+				v.ret(v.new_expr("{arguments[0]} | {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "^" then
+				v.ret(v.new_expr("{arguments[0]} ^ {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary ~" then
+				v.ret(v.new_expr("~{arguments[0]}", ret.as(not null)))
+				return true
+			end
+		else if cname == "Int16" then
+			if pname == "output" then
+				v.add("printf(\"%\"PRIi16 \"\\n\", {arguments.first});")
+				return true
+			else if pname == "object_id" then
+				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
+				return true
+			else if pname == "+" then
+				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "-" then
+				v.ret(v.new_expr("{arguments[0]} - {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary -" then
+				v.ret(v.new_expr("-{arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "unary +" then
+				v.ret(arguments[0])
+				return true
+			else if pname == "*" then
+				v.ret(v.new_expr("{arguments[0]} * {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "/" then
+				v.ret(v.new_expr("{arguments[0]} / {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "%" then
+				v.ret(v.new_expr("{arguments[0]} % {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<<" then
+				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">>" then
+				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "==" then
+				v.ret(v.equal_test(arguments[0], arguments[1]))
+				return true
+			else if pname == "!=" then
+				var res = v.equal_test(arguments[0], arguments[1])
+				v.ret(v.new_expr("!{res}", ret.as(not null)))
+				return true
+			else if pname == "<" then
+				v.ret(v.new_expr("{arguments[0]} < {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">" then
+				v.ret(v.new_expr("{arguments[0]} > {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<=" then
+				v.ret(v.new_expr("{arguments[0]} <= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">=" then
+				v.ret(v.new_expr("{arguments[0]} >= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "to_i" then
+				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_b" then
+				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i8" then
+				v.ret(v.new_expr("(int8_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u16" then
+				v.ret(v.new_expr("(uint16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i32" then
+				v.ret(v.new_expr("(int32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u32" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_f" then
+				v.ret(v.new_expr("(double){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "&" then
+				v.ret(v.new_expr("{arguments[0]} & {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "|" then
+				v.ret(v.new_expr("{arguments[0]} | {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "^" then
+				v.ret(v.new_expr("{arguments[0]} ^ {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary ~" then
+				v.ret(v.new_expr("~{arguments[0]}", ret.as(not null)))
+				return true
+			end
+		else if cname == "UInt16" then
+			if pname == "output" then
+				v.add("printf(\"%\"PRIu16 \"\\n\", {arguments.first});")
+				return true
+			else if pname == "object_id" then
+				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
+				return true
+			else if pname == "+" then
+				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "-" then
+				v.ret(v.new_expr("{arguments[0]} - {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary -" then
+				v.ret(v.new_expr("-{arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "unary +" then
+				v.ret(arguments[0])
+				return true
+			else if pname == "*" then
+				v.ret(v.new_expr("{arguments[0]} * {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "/" then
+				v.ret(v.new_expr("{arguments[0]} / {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "%" then
+				v.ret(v.new_expr("{arguments[0]} % {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<<" then
+				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">>" then
+				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "==" then
+				v.ret(v.equal_test(arguments[0], arguments[1]))
+				return true
+			else if pname == "!=" then
+				var res = v.equal_test(arguments[0], arguments[1])
+				v.ret(v.new_expr("!{res}", ret.as(not null)))
+				return true
+			else if pname == "<" then
+				v.ret(v.new_expr("{arguments[0]} < {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">" then
+				v.ret(v.new_expr("{arguments[0]} > {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<=" then
+				v.ret(v.new_expr("{arguments[0]} <= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">=" then
+				v.ret(v.new_expr("{arguments[0]} >= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "to_i" then
+				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_b" then
+				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i8" then
+				v.ret(v.new_expr("(int8_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i16" then
+				v.ret(v.new_expr("(int16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i32" then
+				v.ret(v.new_expr("(int32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u32" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_f" then
+				v.ret(v.new_expr("(double){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "&" then
+				v.ret(v.new_expr("{arguments[0]} & {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "|" then
+				v.ret(v.new_expr("{arguments[0]} | {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "^" then
+				v.ret(v.new_expr("{arguments[0]} ^ {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary ~" then
+				v.ret(v.new_expr("~{arguments[0]}", ret.as(not null)))
+				return true
+			end
+		else if cname == "Int32" then
+			if pname == "output" then
+				v.add("printf(\"%\"PRIi32 \"\\n\", {arguments.first});")
+				return true
+			else if pname == "object_id" then
+				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
+				return true
+			else if pname == "+" then
+				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "-" then
+				v.ret(v.new_expr("{arguments[0]} - {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary -" then
+				v.ret(v.new_expr("-{arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "unary +" then
+				v.ret(arguments[0])
+				return true
+			else if pname == "*" then
+				v.ret(v.new_expr("{arguments[0]} * {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "/" then
+				v.ret(v.new_expr("{arguments[0]} / {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "%" then
+				v.ret(v.new_expr("{arguments[0]} % {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<<" then
+				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">>" then
+				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "==" then
+				v.ret(v.equal_test(arguments[0], arguments[1]))
+				return true
+			else if pname == "!=" then
+				var res = v.equal_test(arguments[0], arguments[1])
+				v.ret(v.new_expr("!{res}", ret.as(not null)))
+				return true
+			else if pname == "<" then
+				v.ret(v.new_expr("{arguments[0]} < {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">" then
+				v.ret(v.new_expr("{arguments[0]} > {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<=" then
+				v.ret(v.new_expr("{arguments[0]} <= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">=" then
+				v.ret(v.new_expr("{arguments[0]} >= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "to_i" then
+				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_b" then
+				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i8" then
+				v.ret(v.new_expr("(int8_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i16" then
+				v.ret(v.new_expr("(int16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u16" then
+				v.ret(v.new_expr("(uint16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u32" then
+				v.ret(v.new_expr("(uint32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_f" then
+				v.ret(v.new_expr("(double){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "&" then
+				v.ret(v.new_expr("{arguments[0]} & {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "|" then
+				v.ret(v.new_expr("{arguments[0]} | {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "^" then
+				v.ret(v.new_expr("{arguments[0]} ^ {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary ~" then
+				v.ret(v.new_expr("~{arguments[0]}", ret.as(not null)))
+				return true
+			end
+		else if cname == "UInt32" then
+			if pname == "output" then
+				v.add("printf(\"%\"PRIu32 \"\\n\", {arguments.first});")
+				return true
+			else if pname == "object_id" then
+				v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
+				return true
+			else if pname == "+" then
+				v.ret(v.new_expr("{arguments[0]} + {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "-" then
+				v.ret(v.new_expr("{arguments[0]} - {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary -" then
+				v.ret(v.new_expr("-{arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "unary +" then
+				v.ret(arguments[0])
+				return true
+			else if pname == "*" then
+				v.ret(v.new_expr("{arguments[0]} * {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "/" then
+				v.ret(v.new_expr("{arguments[0]} / {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "%" then
+				v.ret(v.new_expr("{arguments[0]} % {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<<" then
+				v.ret(v.new_expr("{arguments[0]} << {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">>" then
+				v.ret(v.new_expr("{arguments[0]} >> {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "==" then
+				v.ret(v.equal_test(arguments[0], arguments[1]))
+				return true
+			else if pname == "!=" then
+				var res = v.equal_test(arguments[0], arguments[1])
+				v.ret(v.new_expr("!{res}", ret.as(not null)))
+				return true
+			else if pname == "<" then
+				v.ret(v.new_expr("{arguments[0]} < {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">" then
+				v.ret(v.new_expr("{arguments[0]} > {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "<=" then
+				v.ret(v.new_expr("{arguments[0]} <= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == ">=" then
+				v.ret(v.new_expr("{arguments[0]} >= {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "to_i" then
+				v.ret(v.new_expr("(long){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_b" then
+				v.ret(v.new_expr("(unsigned char){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i8" then
+				v.ret(v.new_expr("(int8_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i16" then
+				v.ret(v.new_expr("(int16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_u16" then
+				v.ret(v.new_expr("(uint16_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_i32" then
+				v.ret(v.new_expr("(int32_t){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "to_f" then
+				v.ret(v.new_expr("(double){arguments[0]}", ret.as(not null)))
+				return true
+			else if pname == "&" then
+				v.ret(v.new_expr("{arguments[0]} & {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "|" then
+				v.ret(v.new_expr("{arguments[0]} | {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "^" then
+				v.ret(v.new_expr("{arguments[0]} ^ {arguments[1]}", ret.as(not null)))
+				return true
+			else if pname == "unary ~" then
+				v.ret(v.new_expr("~{arguments[0]}", ret.as(not null)))
+				return true
+			end
+		end
+		if pname == "exit" then
+			v.add("exit((int){arguments[1]});")
+			return true
+		else if pname == "sys" then
+			v.ret(v.new_expr("glob_sys", ret.as(not null)))
+			return true
+		else if pname == "object_id" then
+			v.ret(v.new_expr("(long){arguments.first}", ret.as(not null)))
+			return true
+		else if pname == "is_same_type" then
+			v.ret(v.is_same_type_test(arguments[0], arguments[1]))
+			return true
+		else if pname == "is_same_instance" then
+			v.ret(v.equal_test(arguments[0], arguments[1]))
+			return true
+		else if pname == "output_class_name" then
+			var nat = v.class_name_string(arguments.first)
+			v.add("printf(\"%s\\n\", {nat});")
+			return true
+		else if pname == "native_class_name" then
+			var nat = v.class_name_string(arguments.first)
+			v.ret(v.new_expr("(char*){nat}", ret.as(not null)))
+			return true
+		else if pname == "force_garbage_collection" then
 			v.add("nit_gcollect();")
 			return true
 		else if pname == "native_argc" then
@@ -2337,7 +3183,7 @@ redef class AAttrPropdef
 			var res
 			if is_lazy then
 				var set
-				var ret = self.mpropdef.static_mtype
+				var ret = self.mtype
 				var useiset = not ret.is_c_primitive and not ret isa MNullableType
 				var guard = self.mlazypropdef.mproperty
 				if useiset then
@@ -2363,9 +3209,20 @@ redef class AAttrPropdef
 			v.assign(v.frame.returnvar.as(not null), res)
 		else if mpropdef == mwritepropdef then
 			assert arguments.length == 2
-			v.write_attribute(self.mpropdef.mproperty, arguments.first, arguments[1])
+			var recv = arguments.first
+			var arg = arguments[1]
+			if is_optional and v.maybenull(arg) then
+				var value = v.new_var(self.mpropdef.static_mtype.as(not null))
+				v.add("if ({arg} == NULL) \{")
+				v.assign(value, evaluate_expr(v, recv))
+				v.add("\} else \{")
+				v.assign(value, arg)
+				v.add("\}")
+				arg = value
+			end
+			v.write_attribute(self.mpropdef.mproperty, arguments.first, arg)
 			if is_lazy then
-				var ret = self.mpropdef.static_mtype
+				var ret = self.mtype
 				var useiset = not ret.is_c_primitive and not ret isa MNullableType
 				if not useiset then
 					v.write_attribute(self.mlazypropdef.mproperty, arguments.first, v.bool_instance(true))
@@ -2378,7 +3235,7 @@ redef class AAttrPropdef
 
 	fun init_expr(v: AbstractCompilerVisitor, recv: RuntimeVariable)
 	do
-		if has_value and not is_lazy and not n_expr isa ANullExpr then evaluate_expr(v, recv)
+		if has_value and not is_lazy and not is_optional and not n_expr isa ANullExpr then evaluate_expr(v, recv)
 	end
 
 	# Evaluate, store and return the default value of the attribute
@@ -2387,11 +3244,11 @@ redef class AAttrPropdef
 		var oldnode = v.current_node
 		v.current_node = self
 		var old_frame = v.frame
-		var frame = new StaticFrame(v, self.mpropdef.as(not null), recv.mcasttype.undecorate.as(MClassType), [recv])
+		var frame = new StaticFrame(v, self.mreadpropdef.as(not null), recv.mcasttype.undecorate.as(MClassType), [recv])
 		v.frame = frame
 
 		var value
-		var mtype = self.mpropdef.static_mtype
+		var mtype = self.mtype
 		assert mtype != null
 
 		var nexpr = self.n_expr
@@ -2438,8 +3295,7 @@ end
 redef class AClassdef
 	private fun compile_to_c(v: AbstractCompilerVisitor, mpropdef: MMethodDef, arguments: Array[RuntimeVariable])
 	do
-		if mpropdef == self.mfree_init then
-			assert mpropdef.mproperty.is_root_init
+		if mpropdef.mproperty.is_root_init then
 			assert arguments.length == 1
 			if not mpropdef.is_intro then
 				v.supercall(mpropdef, arguments.first.mtype.as(MClassType), arguments)
@@ -2607,8 +3463,19 @@ end
 redef class ADoExpr
 	redef fun stmt(v)
 	do
-		v.stmt(self.n_block)
-		v.add_escape_label(break_mark)
+		if self.n_catch != null then
+			v.add("catchStack.cursor += 1;")
+			v.add("if(!setjmp(catchStack.envs[catchStack.cursor]))\{")
+			v.stmt(self.n_block)
+			v.add("catchStack.cursor -= 1;")
+			v.add("\}else \{")
+			v.add("catchStack.cursor -= 1;")
+			v.stmt(self.n_catch)
+			v.add("\}")
+		else
+			v.stmt(self.n_block)
+		end
+			v.add_escape_label(break_mark)
 	end
 end
 
@@ -2639,53 +3506,68 @@ end
 redef class AForExpr
 	redef fun stmt(v)
 	do
-		var cl = v.expr(self.n_expr, null)
-		var it_meth = self.method_iterator
-		assert it_meth != null
-		var it = v.compile_callsite(it_meth, [cl])
-		assert it != null
+		for g in n_groups do
+			var cl = v.expr(g.n_expr, null)
+			var it_meth = g.method_iterator
+			assert it_meth != null
+			var it = v.compile_callsite(it_meth, [cl])
+			assert it != null
+			g.it = it
+		end
 		v.add("for(;;) \{")
-		var isok_meth = self.method_is_ok
-		assert isok_meth != null
-		var ok = v.compile_callsite(isok_meth, [it])
-		assert ok != null
-		v.add("if(!{ok}) break;")
-		if self.variables.length == 1 then
-			var item_meth = self.method_item
-			assert item_meth != null
-			var i = v.compile_callsite(item_meth, [it])
-			assert i != null
-			v.assign(v.variable(variables.first), i)
-		else if self.variables.length == 2 then
-			var key_meth = self.method_key
-			assert key_meth != null
-			var i = v.compile_callsite(key_meth, [it])
-			assert i != null
-			v.assign(v.variable(variables[0]), i)
-			var item_meth = self.method_item
-			assert item_meth != null
-			i = v.compile_callsite(item_meth, [it])
-			assert i != null
-			v.assign(v.variable(variables[1]), i)
-		else
-			abort
+		for g in n_groups do
+			var it = g.it
+			var isok_meth = g.method_is_ok
+			assert isok_meth != null
+			var ok = v.compile_callsite(isok_meth, [it])
+			assert ok != null
+			v.add("if(!{ok}) break;")
+			if g.variables.length == 1 then
+				var item_meth = g.method_item
+				assert item_meth != null
+				var i = v.compile_callsite(item_meth, [it])
+				assert i != null
+				v.assign(v.variable(g.variables.first), i)
+			else if g.variables.length == 2 then
+				var key_meth = g.method_key
+				assert key_meth != null
+				var i = v.compile_callsite(key_meth, [it])
+				assert i != null
+				v.assign(v.variable(g.variables[0]), i)
+				var item_meth = g.method_item
+				assert item_meth != null
+				i = v.compile_callsite(item_meth, [it])
+				assert i != null
+				v.assign(v.variable(g.variables[1]), i)
+			else
+				abort
+			end
 		end
 		v.stmt(self.n_block)
 		v.add_escape_label(continue_mark)
-		var next_meth = self.method_next
-		assert next_meth != null
-		v.compile_callsite(next_meth, [it])
+		for g in n_groups do
+			var next_meth = g.method_next
+			assert next_meth != null
+			v.compile_callsite(next_meth, [g.it])
+		end
 		v.add("\}")
 		v.add_escape_label(break_mark)
 
-		var method_finish = self.method_finish
-		if method_finish != null then
-			# TODO: Find a way to call this also in long escape (e.g. return)
-			v.compile_callsite(method_finish, [it])
+		for g in n_groups do
+			var method_finish = g.method_finish
+			if method_finish != null then
+				# TODO: Find a way to call this also in long escape (e.g. return)
+				v.compile_callsite(method_finish, [g.it])
+			end
 		end
 	end
 end
 
+redef class AForGroup
+	# C variable representing the iterator
+	private var it: RuntimeVariable is noinit
+end
+
 redef class AAssertExpr
 	redef fun stmt(v)
 	do
@@ -2762,6 +3644,9 @@ redef class AOrElseExpr
 	do
 		var res = v.new_var(self.mtype.as(not null))
 		var i1 = v.expr(self.n_expr, null)
+
+		if not v.maybenull(i1) then return i1
+
 		v.add("if ({i1}!=NULL) \{")
 		v.assign(res, i1)
 		v.add("\} else \{")
@@ -2772,8 +3657,18 @@ redef class AOrElseExpr
 	end
 end
 
-redef class AIntExpr
-	redef fun expr(v) do return v.int_instance(self.value.as(not null))
+redef class AIntegerExpr
+	redef fun expr(v) do
+		if value isa Int then return v.int_instance(value.as(Int))
+		if value isa Byte then return v.byte_instance(value.as(Byte))
+		if value isa Int8 then return v.int8_instance(value.as(Int8))
+		if value isa Int16 then return v.int16_instance(value.as(Int16))
+		if value isa UInt16 then return v.uint16_instance(value.as(UInt16))
+		if value isa Int32 then return v.int32_instance(value.as(Int32))
+		if value isa UInt32 then return v.uint32_instance(value.as(UInt32))
+		# Should never happen
+		abort
+	end
 end
 
 redef class AFloatExpr
@@ -2781,7 +3676,11 @@ redef class AFloatExpr
 end
 
 redef class ACharExpr
-	redef fun expr(v) do return v.char_instance(self.value.as(not null))
+	redef fun expr(v) do
+		if is_ascii then return v.byte_instance(value.as(not null).ascii)
+		if is_code_point then return v.int_instance(value.as(not null).code_point)
+		return v.char_instance(self.value.as(not null))
+	end
 end
 
 redef class AArrayExpr
@@ -2802,14 +3701,75 @@ redef class AArrayExpr
 	end
 end
 
+redef class AugmentedStringFormExpr
+	# Factorize the making of a `Regex` object from a literal prefixed string
+	protected fun make_re(v: AbstractCompilerVisitor, rs: RuntimeVariable): nullable RuntimeVariable do
+		var re = to_re
+		assert re != null
+		var res = v.compile_callsite(re, [rs])
+		if res == null then
+			print "Cannot call property `to_re` on {self}"
+			abort
+		end
+		for i in suffix.chars do
+			if i == 'i' then
+				var ign = ignore_case
+				assert ign != null
+				v.compile_callsite(ign, [res, v.bool_instance(true)])
+				continue
+			end
+			if i == 'm' then
+				var nl = newline
+				assert nl != null
+				v.compile_callsite(nl, [res, v.bool_instance(true)])
+				continue
+			end
+			if i == 'b' then
+				var ext = extended
+				assert ext != null
+				v.compile_callsite(ext, [res, v.bool_instance(false)])
+				continue
+			end
+			# Should not happen, this needs to be updated
+			# along with the addition of new suffixes
+			abort
+		end
+		return res
+	end
+end
+
 redef class AStringFormExpr
-	redef fun expr(v) do return v.string_instance(self.value.as(not null))
+	redef fun expr(v) do return v.string_instance(value)
+end
+
+redef class AStringExpr
+	redef fun expr(v) do
+		var s = v.string_instance(value)
+		if is_string then return s
+		if is_bytestring then
+			var ns = v.c_string_instance(bytes.items, bytes.length)
+			var ln = v.int_instance(bytes.length)
+			var cs = to_bytes_with_copy
+			assert cs != null
+			var res = v.compile_callsite(cs, [ns, ln])
+			assert res != null
+			s = res
+		else if is_re then
+			var res = make_re(v, s)
+			assert res != null
+			s = res
+		else
+			print "Unimplemented prefix or suffix for {self}"
+			abort
+		end
+		return s
+	end
 end
 
 redef class ASuperstringExpr
 	redef fun expr(v)
 	do
-		var type_string = mtype.as(not null)
+		var type_string = v.mmodule.string_type
 
 		# Collect elements of the superstring
 		var array = new Array[AExpr]
@@ -2861,12 +3821,16 @@ redef class ASuperstringExpr
 			v.native_array_set(a, i, e)
 		end
 
-		# Fast join the native string to get the result
+		# Fast join the C string to get the result
 		var res = v.send(v.get_property("native_to_s", a.mtype), [a])
+		assert res != null
+
+		if is_re then res = make_re(v, res)
 
 		# We finish to work with the native array,
 		# so store it so that it can be reused
 		v.add("{varonce} = {a};")
+
 		return res
 	end
 end
@@ -2911,7 +3875,9 @@ redef class AIsaExpr
 	redef fun expr(v)
 	do
 		var i = v.expr(self.n_expr, null)
-		return v.type_test(i, self.cast_type.as(not null), "isa")
+		var cast_type = self.cast_type
+		if cast_type == null then return null # no-no on broken node
+		return v.type_test(i, cast_type, "isa")
 	end
 end
 
@@ -2932,7 +3898,7 @@ redef class AAsNotnullExpr
 		var i = v.expr(self.n_expr, null)
 		if v.compiler.modelbuilder.toolcontext.opt_no_check_assert.value then return i
 
-		if i.mtype.is_c_primitive then return i
+		if not v.maybenull(i) then return i
 
 		v.add("if (unlikely({i} == NULL)) \{")
 		v.add_abort("Cast failed")
@@ -2971,6 +3937,7 @@ redef class ASendExpr
 	do
 		var recv = v.expr(self.n_expr, null)
 		var callsite = self.callsite.as(not null)
+		if callsite.is_broken then return null
 		var args = v.varargize(callsite.mpropdef, callsite.signaturemap, recv, self.raw_arguments)
 		return v.compile_callsite(callsite, args)
 	end
@@ -2981,6 +3948,7 @@ redef class ASendReassignFormExpr
 	do
 		var recv = v.expr(self.n_expr, null)
 		var callsite = self.callsite.as(not null)
+		if callsite.is_broken then return
 		var args = v.varargize(callsite.mpropdef, callsite.signaturemap, recv, self.raw_arguments)
 
 		var value = v.expr(self.n_value, null)
@@ -2999,17 +3967,19 @@ end
 redef class ASuperExpr
 	redef fun expr(v)
 	do
-		var recv = v.frame.arguments.first
+		var frame = v.frame.as(not null)
+		var recv = frame.arguments.first
 
 		var callsite = self.callsite
 		if callsite != null then
+			if callsite.is_broken then return null
 			var args
 
 			if self.n_args.n_exprs.is_empty then
 				# Add automatic arguments for the super init call
 				args = [recv]
 				for i in [0..callsite.msignature.arity[ do
-					args.add(v.frame.arguments[i+1])
+					args.add(frame.arguments[i+1])
 				end
 			else
 				args = v.varargize(callsite.mpropdef, callsite.signaturemap, recv, self.n_args.n_exprs)
@@ -3024,7 +3994,7 @@ redef class ASuperExpr
 
 		var args
 		if self.n_args.n_exprs.is_empty then
-			args = v.frame.arguments
+			args = frame.arguments
 		else
 			args = v.varargize(mpropdef, signaturemap, recv, self.n_args.n_exprs)
 		end
@@ -3048,10 +4018,35 @@ redef class ANewExpr
 			return v.native_array_instance(elttype, l)
 		end
 
-		var recv = v.init_instance_or_extern(mtype)
-
 		var callsite = self.callsite
-		if callsite == null then return recv
+		if callsite == null then return v.init_instance_or_extern(mtype)
+		if callsite.is_broken then return null
+
+		var recv
+		# new factories are badly implemented.
+		# They assume a stub temporary receiver exists.
+		# This temporary receiver is required because it
+		# currently holds the method and the formal types.
+		#
+		# However, this object could be reused if the formal types are the same.
+		# Therefore, the following code will `once` it in these case
+		if callsite.mproperty.is_new and not mtype.need_anchor then
+			var name = v.get_name("varoncenew")
+			var guard = v.get_name(name + "_guard")
+			v.add_decl("static {mtype.ctype} {name};")
+			v.add_decl("static int {guard};")
+			recv = v.new_var(mtype)
+			v.add("if (likely({guard})) \{")
+			v.add("{recv} = {name};")
+			v.add("\} else \{")
+			var i = v.init_instance_or_extern(mtype)
+			v.add("{recv} = {i};")
+			v.add("{name} = {recv};")
+			v.add("{guard} = 1;")
+			v.add("\}")
+		else
+			recv = v.init_instance_or_extern(mtype)
+		end
 
 		var args = v.varargize(callsite.mpropdef, callsite.signaturemap, recv, self.n_args.n_exprs)
 		var res2 = v.compile_callsite(callsite, args)
@@ -3191,7 +4186,8 @@ end
 # Here we load an process all modules passed on the command line
 var mmodules = modelbuilder.parse(arguments)
 
-if mmodules.is_empty then return
+if mmodules.is_empty then toolcontext.quit
+
 modelbuilder.run_phases
 
 for mmodule in mmodules do