1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
15 # Compile Nit code to Java code
17 # 3 runtime structures are used to represent Nit instance in Java generated code:
18 # * `RTClass` to represent a class, it's super-type table and its VFT
19 # * `RTMethod` to reprensent a compiled method definition
20 # * `RTVal` to reprensent a Nit instance, the null value or a native value
22 # More details are given in the documentation of these 3 classes.
24 # TODO Factorize with `abstract_compiler`
27 import rapid_type_analysis
30 redef class ToolContext
32 # Where to output the generated binary
33 var opt_output
= new OptionString("Output file", "-o", "--output")
35 # Where to output tmp files
36 var opt_compile_dir
= new OptionString("Directory used to generate temporary files", "--compile-dir")
40 option_context
.add_option
(opt_output
, opt_compile_dir
)
44 redef class ModelBuilder
46 # Start the Java compiler
47 fun run_java_compiler
(mainmodule
: MModule, runtime_type_analysis
: RapidTypeAnalysis) do
49 toolcontext
.info
("*** GENERATING JAVA ***", 1)
51 var compiler
= new JavaCompiler(mainmodule
, self, runtime_type_analysis
)
52 compiler
.do_compilation
55 toolcontext
.info
("*** END GENERATING JAVA: {time1-time0} ***", 2)
56 write_and_make
(compiler
)
59 # Write Java code and compile it into an executable jar
60 fun write_and_make
(compiler
: JavaCompiler) do
62 toolcontext
.info
("*** WRITING JAVA ***", 1)
64 compiler
.compile_dir
.mkdir
66 var jfiles
= write_java_files
(compiler
)
69 toolcontext
.info
("*** END WRITING JAVA: {time1-time0} ***", 2)
72 toolcontext
.info
("*** COMPILING JAVA ***", 1)
74 build_with_make
(compiler
, jfiles
)
75 write_shell_script
(compiler
)
78 toolcontext
.info
("*** END COMPILING JAVA: {time1-time0} ***", 2)
81 # Write files managed by `compiler` into concrete files
82 fun write_java_files
(compiler
: JavaCompiler): Array[String] do
83 var jfiles
= new Array[String]
84 for f
in compiler
.files
do
85 var file
= new FileWriter.open
("{compiler.compile_dir}/{f.filename}")
86 for line
in f
.lines
do file
.write
(line
)
88 jfiles
.add
(f
.filename
)
93 # Compile Java generated files using `make`
94 fun build_with_make
(compiler
: JavaCompiler, jfiles
: Array[String]) do
95 write_manifest
(compiler
)
96 write_makefile
(compiler
, jfiles
)
97 var compile_dir
= compiler
.compile_dir
98 var outname
= compiler
.outname
.to_path
.filename
99 toolcontext
.info
("make -N -C {compile_dir} -f {outname}.mk", 2)
101 if toolcontext
.verbose_level
>= 3 then
102 res
= sys
.system
("make -B -C {compile_dir} -f {outname}.mk 2>&1")
104 res
= sys
.system
("make -B -C {compile_dir} -f {outname}.mk 2>&1 > /dev/null")
106 if res
!= 0 then toolcontext
.error
(null, "make failed! Error code: {res}.")
109 # Write the Makefile used to compile Java generated files into an executable jar
110 fun write_makefile
(compiler
: JavaCompiler, jfiles
: Array[String]) do
111 # list class files from jfiles
112 var ofiles
= new List[String]
113 for f
in jfiles
do ofiles
.add
(f
.strip_extension
(".java") + ".class")
115 var compile_dir
= compiler
.compile_dir
116 var outname
= compiler
.outname
.to_path
.filename
117 var outpath
= (sys
.getcwd
/ compiler
.outname
).simplify_path
118 var makename
= "{compile_dir}/{outname}.mk"
119 var makefile
= new FileWriter.open
(makename
)
121 makefile
.write
("JC = javac\n")
122 makefile
.write
("JAR = jar\n\n")
124 makefile
.write
("all: {outpath}.jar\n\n")
126 makefile
.write
("{outpath}.jar: {compiler.mainmodule.jname}_Main.class\n")
127 makefile
.write
("\t$(JAR) cfm {outpath}.jar {outname}.mf {ofiles.join(" ")}\n\n")
129 makefile
.write
("{compiler.mainmodule.jname}_Main.class:\n")
130 makefile
.write
("\t$(JC) {jfiles.join(" ")}\n\n")
132 makefile
.write
("clean:\n")
133 makefile
.write
("\trm {ofiles.join(" ")} 2>/dev/null\n\n")
136 toolcontext
.info
("Generated makefile: {makename}", 2)
139 # Write the Java manifest file
140 private fun write_manifest
(compiler
: JavaCompiler) do
141 var compile_dir
= compiler
.compile_dir
142 var outname
= compiler
.outname
.to_path
.filename
143 var maniffile
= new FileWriter.open
("{compile_dir}/{outname}.mf")
144 maniffile
.write
("Manifest-Version: 1.0\n")
145 maniffile
.write
("Main-Class: {compiler.mainmodule.jname}_Main\n")
149 # Write a simple bash script that runs the jar like it was a binary generated by nitc
150 private fun write_shell_script
(compiler
: JavaCompiler) do
151 var outname
= compiler
.outname
152 var shfile
= new FileWriter.open
(outname
)
153 shfile
.write
("#!/bin/bash\n")
154 shfile
.write
("java -jar {outname}.jar \"$@\
"\n")
156 sys
.system
("chmod +x {outname}")
160 # Compiler that translates Nit code to Java code
162 # The main module of the program currently compiled
163 var mainmodule
: MModule
165 # Modelbuilder used to know the model and the AST
166 var modelbuilder
: ModelBuilder
168 # The result of the RTA (used to know live types and methods)
169 var runtime_type_analysis
: RapidTypeAnalysis
171 # Where to generate tmp files
172 var compile_dir
: String is lazy
do
173 var dir
= modelbuilder
.toolcontext
.opt_compile_dir
.value
174 if dir
== null then dir
= "nitj_compile"
178 # Name of the generated executable
179 var outname
: String is lazy
do
180 var name
= modelbuilder
.toolcontext
.opt_output
.value
181 if name
== null then name
= mainmodule
.jname
185 # The list of all associated files
186 # Used to generate .java files
187 var files
: Array[JavaCodeFile] = new Array[JavaCodeFile]
189 # Force the creation of a new file
190 # The point is to avoid contamination between must-be-compiled-separately files
191 fun new_file
(name
: String): JavaCodeFile do
192 var file
= new JavaCodeFile(name
)
197 # Kind of visitor to use
198 type VISITOR: JavaCompilerVisitor
200 # Initialize a visitor specific for the compiler engine
201 fun new_visitor
(filename
: String): VISITOR do
202 return new JavaCompilerVisitor(self, new_file
(filename
))
205 # RuntimeModel representation
206 private var rt_model
: JavaRuntimeModel is lazy
do return new JavaRuntimeModel
208 # Compile Nit code to Java
209 fun do_compilation
do
210 # compile java classes used to represents the runtime model of the program
211 rt_model
.compile_rtmodel
(self)
214 # compile class structures
215 compile_mclasses_to_java
217 # compile method structures
218 compile_mmethods_to_java
221 modelbuilder
.toolcontext
.info
("NOT YET IMPLEMENTED", 0)
224 # Prepare the boxes used to represent Java primitive types
225 fun compile_box_kinds
do
226 # Collect all bas box class
227 # FIXME: this is not completely fine with a separate compilation scheme
228 for classname
in ["Int", "Bool", "Byte", "Char", "Float"] do
229 var classes
= mainmodule
.model
.get_mclasses_by_name
(classname
)
230 if classes
== null then continue
231 assert classes
.length
== 1 else print classes
.join
(", ")
232 box_kinds
.add
(classes
.first
.mclass_type
)
236 # Types of boxes used to represent Java primitive types
237 var box_kinds
= new Array[MClassType]
239 # Generate a `RTClass` for each `MClass` found in model
241 # This is a global phase because we need to know all the program to build
242 # attributes, fill vft and type table.
243 fun compile_mclasses_to_java
do
244 for mclass
in mainmodule
.model
.mclasses
do
245 mclass
.compile_to_java
(new_visitor
("{mclass.rt_name}.java"))
249 # Generate a `RTMethod` for each `MMethodDef` found in model
251 # This is a separate phase.
252 fun compile_mmethods_to_java
do
253 for mmodule
in mainmodule
.in_importation
.greaters
do
254 for mclassdef
in mmodule
.mclassdefs
do
255 for mdef
in mclassdef
.mpropdefs
do
256 if mdef
isa MMethodDef then
257 mdef
.compile_to_java
(new_visitor
("{mdef.rt_name}.java"))
265 # The class visiting the AST
267 # A visitor is attached to one JavaCodeFile it writes into.
268 class JavaCompilerVisitor
271 # JavaCompiler used with this visitor
272 type COMPILER: JavaCompiler
274 # The associated compiler
275 var compiler
: JavaCompiler
277 # The file to write generated code into
278 var file
: JavaCodeFile
282 private var names
= new HashSet[String]
283 private var last
: Int = 0
285 # Return a new name based on `s` and unique in the visitor
286 fun get_name
(s
: String): String do
287 if not self.names
.has
(s
) then
291 var i
= self.last
+ 1
294 if not self.names
.has
(s2
) then
305 # Registered variables
306 protected var variables
= new HashMap[Variable, RuntimeVariable]
308 # Return the local RuntimeVariable associated to a Nit local variable
309 fun variable
(variable
: Variable): RuntimeVariable do
310 if variables
.has_key
(variable
) then
311 return variables
[variable
]
313 var name
= get_name
("var_{variable.name}")
314 var mtype
= variable
.declared_type
.as(not null)
315 mtype
= anchor
(mtype
)
316 var res
= decl_var
(name
, mtype
)
317 variables
[variable
] = res
322 # Return a new uninitialized local RuntimeVariable with `name`
323 fun decl_var
(name
: String, mtype
: MType): RuntimeVariable do
324 var res
= new RuntimeVariable(name
, mtype
, mtype
)
325 res
.is_boxed
= not mtype
.is_java_primitive
326 add
("{mtype.java_type} {name} /* : {mtype} */;")
330 # Return a new uninitialized local RuntimeVariable
331 fun new_var
(mtype
: MType): RuntimeVariable do
332 mtype
= anchor
(mtype
)
333 var name
= self.get_name
("var")
334 return decl_var
(name
, mtype
)
339 # The current `JavaStaticFrame`
340 var frame
: nullable JavaStaticFrame = null is writable
342 # Return a new local RuntimeVariable initialized from `args[0]`
343 fun new_recv
(mtype
: MType): RuntimeVariable do
344 var res
= new_var
(mtype
)
345 add
("{res} = args[0];")
351 # Compile a call within a callsite
352 fun compile_callsite
(callsite
: CallSite, arguments
: Array[RuntimeVariable]): nullable RuntimeVariable do
353 var initializers
= callsite
.mpropdef
.initializers
354 if not initializers
.is_empty
then
355 var recv
= arguments
.first
358 for p
in initializers
do
359 if p
isa MMethod then
361 var msignature
= p
.intro
.msignature
362 if msignature
!= null then
363 for x
in msignature
.mparameters
do
364 args
.add arguments
[i
]
369 else if p
isa MAttribute then
370 info
("NOT YET IMPLEMENTED {class_name}::compile_callsite for MAttribute `{p}`")
371 #self.write_attribute(p, recv, arguments[i])
375 assert i
== arguments
.length
377 return send
(callsite
.mproperty
, [recv
])
380 return send
(callsite
.mproperty
, arguments
)
383 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
385 # This method is used to manage varargs in signatures and returns the real array
386 # of runtime variables to use in the call.
387 fun varargize
(mpropdef
: MMethodDef, map
: nullable SignatureMap, recv
: RuntimeVariable, args
: SequenceRead[AExpr]): Array[RuntimeVariable] do
388 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
389 var res
= new Array[RuntimeVariable]
392 if msignature
.arity
== 0 then return res
395 assert args
.length
== msignature
.arity
397 res
.add expr
(ne
, null)
402 # Eval in order of arguments, not parameters
403 var exprs
= new Array[RuntimeVariable].with_capacity
(args
.length
)
405 exprs
.add expr
(ne
, null)
408 # Fill `res` with the result of the evaluation according to the mapping
409 for i
in [0..msignature
.arity
[ do
410 var param
= msignature
.mparameters
[i
]
411 var j
= map
.map
.get_or_null
(i
)
414 res
.add
(null_instance
)
417 if param
.is_vararg
and map
.vararg_decl
> 0 then
418 var vararg
= exprs
.sub
(j
, map
.vararg_decl
)
419 var elttype
= param
.mtype
420 var arg
= self.vararg_instance
(mpropdef
, recv
, vararg
, elttype
)
429 # Generate a static call on a method definition (no receiver needed).
430 fun static_call
(mmethoddef
: MMethodDef, arguments
: Array[RuntimeVariable]): nullable RuntimeVariable do
431 var res
: nullable RuntimeVariable
432 var ret
= mmethoddef
.msignature
.as(not null).return_mtype
436 ret
= ret
.resolve_for
(mmethoddef
.mclassdef
.bound_mtype
, mmethoddef
.mclassdef
.bound_mtype
, mmethoddef
.mclassdef
.mmodule
, true)
437 res
= self.new_var
(ret
)
441 adapt_signature
(mmethoddef
, arguments
)
443 var rt_name
= mmethoddef
.rt_name
445 add
("{rt_name}.get{rt_name}().exec(new RTVal[]\{{arguments.join(",")}\});")
448 var ress
= new_expr
("{rt_name}.get{rt_name}().exec(new RTVal[]\{{arguments.join(",")}\});", compiler
.mainmodule
.object_type
)
453 # Generate a polymorphic send for `method` with `arguments`
454 fun send
(mmethod
: MMethod, arguments
: Array[RuntimeVariable]): nullable RuntimeVariable do
456 return table_send
(mmethod
, arguments
)
460 # Handle common special cases before doing the effective method invocation
461 # This methods handle the `==` and `!=` methods and the case of the null receiver.
462 # Note: a { is open in the generated C, that enclose and protect the effective method invocation.
463 # Client must not forget to close the } after them.
465 # The value returned is the result of the common special cases.
466 # If not null, client must compile it with the result of their own effective method invocation.
468 # If `before_send` can shortcut the whole message sending, a dummy `if(0){`
469 # is generated to cancel the effective method invocation that will follow
470 # TODO: find a better approach
471 private fun before_send
(res
: nullable RuntimeVariable, mmethod
: MMethodDef, arguments
: Array[RuntimeVariable]) do
472 var bool_type
= compiler
.mainmodule
.bool_type
473 var recv
= arguments
.first
474 var consider_null
= mmethod
.name
== "==" or mmethod
.name
== "!=" or mmethod
.name
== "is_same_instance"
475 if recv
.mcasttype
isa MNullableType or recv
.mcasttype
isa MNullType then
476 add
("if ({recv} == null || {recv}.is_null()) \{")
477 if mmethod
.name
== "==" or mmethod
.name
== "is_same_instance" then
478 if res
== null then res
= new_var
(bool_type
)
479 var arg
= arguments
[1]
480 if arg
.mcasttype
isa MNullableType then
481 add
("{res} = ({arg} == null || {arg}.is_null());")
482 else if arg
.mcasttype
isa MNullType then
483 add
("{res} = true; /* is null */")
485 add
("{res} = false; /* {arg.inspect} cannot be null */")
487 else if mmethod
.name
== "!=" then
488 if res
== null then res
= new_var
(bool_type
)
489 # res = self.new_var(bool_type)
490 var arg
= arguments
[1]
491 if arg
.mcasttype
isa MNullableType then
492 add
("{res} = ({arg} != null && !{arg}.is_null());")
493 else if arg
.mcasttype
isa MNullType then
494 add
("{res} = false; /* is null */")
496 add
("{res} = true; /* {arg.inspect} cannot be null */")
499 add_abort
("Receiver is null")
505 add
"/* recv ({recv}) cannot be null since it's a {recv.mcasttype}"
507 if consider_null
then
508 var arg
= arguments
[1]
509 if arg
.mcasttype
isa MNullType then
510 if res
== null then res
= new_var
(bool_type
)
511 if mmethod
.name
== "!=" then
512 add
("{res} = true; /* arg is null and recv is not */")
513 else # `==` and `is_same_instance`
514 add
("{res} = false; /* arg is null but recv is not */")
516 add
("\}") # closes the null case
517 add
("if (false) \{") # what follow is useless, Javac will drop it
522 # Perform a method call through vft
523 private fun table_send
(mmethod
: TableCallable, arguments
: Array[RuntimeVariable]): nullable RuntimeVariable do
526 if mmethod
isa MMethod then
528 name
= mmethod
.full_name
529 else if mmethod
isa MMethodDef then
531 name
= mmethod
.full_name
536 var recv
= arguments
.first
537 var rect
= mdef
.mclassdef
.bound_mtype
538 var msignature
= mdef
.msignature
.as(not null)
539 msignature
= msignature
.resolve_for
(rect
, rect
, compiler
.mainmodule
, true)
540 adapt_signature
(mdef
, arguments
)
542 var res
: nullable RuntimeVariable
543 var ret
= msignature
.return_mtype
547 res
= self.new_var
(ret
)
550 before_send
(res
, mdef
, arguments
)
552 add
"/* concrete call to {mdef} */"
554 var ress
= new_expr
("{recv}.rtclass.vft.get(\"{name}\
").exec(new RTVal[]\{{arguments.join(",")}\});", compiler
.mainmodule
.object_type
)
557 add
("{recv}.rtclass.vft.get(\"{name}\
").exec(new RTVal[]\{{arguments.join(",")}\});")
560 add
("\}") # closes the null case
567 # Add a line (will be suffixed by `\n`)
568 fun add
(line
: String) do file
.lines
.add
("{line}\n")
570 # Add a new partial line (no `\n` suffix)
571 fun addn
(line
: String) do file
.lines
.add
(line
)
573 # Compile a statement (if any)
574 fun stmt
(nexpr
: nullable AExpr) do
575 if nexpr
== null then return
576 var old
= self.current_node
582 # Compile an expression an return its result
583 # `mtype` is the expected return type, pass null if no specific type is expected.
584 fun expr
(nexpr
: AExpr, mtype
: nullable MType): RuntimeVariable do
585 var old
= current_node
589 if nexpr
.mtype
!= null then
590 res
= nexpr
.expr
(self)
593 if mtype
!= null then
594 mtype
= anchor
(mtype
)
595 res
= autobox
(res
, mtype
)
602 # Correctly assign a left and a right value
603 # Boxing and unboxing is performed if required
604 fun assign
(left
, right
: RuntimeVariable) do
605 add
("{left} = {autobox(right, left.mtype)};")
608 # Return a new local RuntimeVariable initialized with the Java expression `jexpr`.
610 # `mtype` is used for the Java return variable initialization.
611 fun new_expr
(jexpr
: String, mtype
: MType): RuntimeVariable do
612 var res
= new_var
(mtype
)
613 add
("{res} = {jexpr};")
617 # Generate generic abort
619 # Used by aborts, asserts, casts, etc.
620 fun add_abort
(message
: String) do
621 add
("System.err.print(\"Runtime error
: {message}\
");")
622 var node
= current_node
624 add
("System.err.print(\" ({node.location.short_location})\
");")
626 add
("System.err.println(\"\
");")
627 add
("System.exit(1);")
632 # Anchor a type to the main module and the current receiver
633 fun anchor
(mtype
: MType): MType do
634 if not mtype
.need_anchor
then return mtype
635 return mtype
.anchor_to
(compiler
.mainmodule
, frame
.as(not null).receiver
)
638 # Adapt the arguments of a method according to targetted `MMethodDef`
639 fun adapt_signature
(m
: MMethodDef, args
: Array[RuntimeVariable]) do
640 var msignature
= m
.msignature
.as(not null).resolve_for
(
641 m
.mclassdef
.bound_mtype
,
642 m
.mclassdef
.bound_mtype
,
643 m
.mclassdef
.mmodule
, true)
644 args
.first
= autobox
(args
.first
, compiler
.mainmodule
.object_type
)
645 for i
in [0..msignature
.arity
[ do
646 args
[i
+1] = autobox
(args
[i
+ 1], compiler
.mainmodule
.object_type
)
650 # Box primitive `value` to `mtype`.
651 private fun box
(value
: RuntimeVariable, mtype
: MType): RuntimeVariable do
652 if value
.is_boxed
then return value
653 var obj_type
= compiler
.mainmodule
.object_type
654 if value
.mtype
isa MNullType then
655 return new_expr
("new RTVal(null, null)", compiler
.mainmodule
.model
.null_type
)
657 var mbox
= value
.mtype
.as(MClassType).mclass
658 return new_expr
("new RTVal({mbox.rt_name}.get{mbox.rt_name}(), {value})", obj_type
)
661 # Unbox primitive `value` to `mtype`.
662 private fun unbox
(value
: RuntimeVariable, mtype
: MType): RuntimeVariable do
663 if not value
.is_boxed
then return value
664 if not mtype
.is_java_primitive
then return value
665 if compiler
.box_kinds
.has
(mtype
) then
666 return new_expr
("({mtype.java_type}){value}.value", mtype
)
668 info
"NOT YET IMPLEMENTED unbox for {value} ({mtype})"
673 # Box or unbox primitive `value` to `mtype` if needed.
674 private fun autobox
(value
: RuntimeVariable, mtype
: MType): RuntimeVariable do
675 if mtype
.is_java_primitive
then return unbox
(value
, mtype
)
676 return box
(value
, mtype
)
679 # Can this `value` be a primitive Java value?
680 private fun can_be_primitive
(value
: RuntimeVariable): Bool do
681 var t
= value
.mcasttype
.undecorate
682 if not t
isa MClassType then return false
683 var k
= t
.mclass
.kind
684 return k
== interface_kind
or t
.is_java_primitive
689 # Generate an integer value
690 fun int_instance
(value
: Int): RuntimeVariable do
691 var t
= compiler
.mainmodule
.int_type
692 return new RuntimeVariable(value
.to_s
, t
, t
)
695 # Generate a byte value
696 fun byte_instance
(value
: Byte): RuntimeVariable do
697 var t
= compiler
.mainmodule
.byte_type
698 return new RuntimeVariable(value
.to_s
, t
, t
)
701 # Generate a char value
702 fun char_instance
(value
: Char): RuntimeVariable do
703 var t
= compiler
.mainmodule
.char_type
704 return new RuntimeVariable("'{value.to_s.escape_to_c}'", t
, t
)
707 # Generate a float value
709 # FIXME pass a Float, not a string
710 fun float_instance
(value
: String): RuntimeVariable do
711 var t
= compiler
.mainmodule
.float_type
712 return new RuntimeVariable(value
.to_s
, t
, t
)
715 # Generate an integer value
716 fun bool_instance
(value
: Bool): RuntimeVariable do
717 var t
= compiler
.mainmodule
.bool_type
718 return new RuntimeVariable(value
.to_s
, t
, t
)
721 # Generate the `null` value
722 fun null_instance
: RuntimeVariable do
723 var t
= compiler
.mainmodule
.model
.null_type
724 return new RuntimeVariable("null", t
, t
)
727 # Get an instance of a array for a vararg
728 fun vararg_instance
(mpropdef
: MPropDef, recv
: RuntimeVariable, varargs
: Array[RuntimeVariable], elttype
: MType): RuntimeVariable do
729 # TODO handle dynamic types
730 info
("NOT YET IMPLEMENTED vararg_instance")
732 # TODO return array_instance(varargs, elttype)
737 # Display a info message
738 fun info
(str
: String) do compiler
.modelbuilder
.toolcontext
.info
(str
, 0)
741 # A file containing Java code.
748 var lines
: List[String] = new List[String]
752 # A Java compatible name for `self`
753 private fun jname
: String do return name
.to_cmangle
756 # Handler for runtime classes generation
758 # We need 3 kinds of runtime structures:
759 # * `RTClass` to represent a global class
760 # * `RTMethod` to represent a method definition
761 # * `RTVal` to represent runtime variables
762 class JavaRuntimeModel
764 # Compile JavaRuntimeModel structures
765 fun compile_rtmodel
(compiler
: JavaCompiler) do
766 compile_rtclass
(compiler
)
767 compile_rtmethod
(compiler
)
768 compile_rtval
(compiler
)
771 # Compile the abstract runtime class structure
773 # Runtime classes have 3 attributes:
774 # * `class_name`: the class name as a String
775 # * `vft`: the virtual function table for the class (flattened)
776 # * `supers`: the super type table (used for type tests)
777 fun compile_rtclass
(compiler
: JavaCompiler) do
778 var v
= compiler
.new_visitor
("RTClass.java")
779 v
.add
("import java.util.HashMap;")
780 v
.add
("public abstract class RTClass \{")
781 v
.add
(" public String class_name;")
782 v
.add
(" public HashMap<String, RTMethod> vft = new HashMap<>();")
783 v
.add
(" public HashMap<String, RTClass> supers = new HashMap<>();")
784 v
.add
(" protected RTClass() \{\}")
788 # Compile the abstract runtime method structure
790 # Method body is executed through the `exec` method:
791 # * `exec` always take an array of RTVal as arg, the first one must be the receiver
792 # * `exec` always returns a RTVal (or null if the Nit return type is void)
793 fun compile_rtmethod
(compiler
: JavaCompiler) do
794 var v
= compiler
.new_visitor
("RTMethod.java")
795 v
.add
("public abstract class RTMethod \{")
796 v
.add
(" protected RTMethod() \{\}")
797 v
.add
(" public abstract RTVal exec(RTVal[] args);")
801 # Compile the runtime value structure
803 # RTVal both represents object instances and primitives values:
804 # * object instances:
805 # * `rtclass` the class of the RTVal is instance of
806 # * `attrs` contains the attributes of the instance
807 # * primitive values:
808 # * `rtclass` represents the class of the primitive value Nit type
809 # * `value` contains the primitive value of the instance
811 # * they must have both `rtclass` and `value` as null
812 fun compile_rtval
(compiler
: JavaCompiler) do
813 var v
= compiler
.new_visitor
("RTVal.java")
814 v
.add
("import java.util.HashMap;")
815 v
.add
("public class RTVal \{")
816 v
.add
(" public RTClass rtclass;")
817 v
.add
(" public HashMap<String, RTVal> attrs = new HashMap<>();")
818 v
.add
(" Object value;")
819 v
.add
(" public RTVal(RTClass rtclass) \{")
820 v
.add
(" this.rtclass = rtclass;")
822 v
.add
(" public RTVal(RTClass rtclass, Object value) \{")
823 v
.add
(" this.rtclass = rtclass;")
824 v
.add
(" this.value = value;")
826 v
.add
(" public boolean is_null() \{ return rtclass == null && value == null; \}")
831 # A runtime variable hold a runtime value in Java.
832 # Runtime variables are associated to Nit local variables and intermediate results in Nit expressions.
833 class RuntimeVariable
835 # The name of the variable in the Java code
838 # The static type of the variable (as declard in Java)
841 # The current casted type of the variable (as known in Nit)
842 var mcasttype
: MType is writable
844 # If the variable exaclty a mcasttype?
845 # false (usual value) means that the variable is a mcasttype or a subtype.
846 var is_exact
: Bool = false is writable
848 # Is this variable declared as a RTVal or a Java primitive one?
851 redef fun to_s
do return name
856 if self.is_exact
then
862 if self.mtype
== self.mcasttype
then
863 type_str
= "{mtype}{exact_str}"
865 type_str
= "{mtype}({mcasttype}{exact_str})"
867 return "<{name}:{type_str}>"
871 # The static context of a visited property in a `JavaCompilerVisitor`
872 class JavaStaticFrame
873 # The associated visitor
874 var visitor
: JavaCompilerVisitor
876 # The executed property.
877 # A Method in case of a call, an attribute in case of a default initialization.
878 var mpropdef
: MPropDef
880 # The static type of the receiver
881 var receiver
: MClassType
883 # Arguments of the method (the first is the receiver)
884 var arguments
: Array[RuntimeVariable]
886 # The runtime_variable associated to the return (in a function)
887 var returnvar
: nullable RuntimeVariable = null is writable
889 # The label at the end of the property
890 var returnlabel
: nullable String = null is writable
894 # Return a shortened version of the location with `"{file}:{line_start}"`
895 fun short_location
: String do
897 if file
== null then return "<no file>:{line_start}"
898 return "{file.filename.escape_to_c}:{line_start}"
903 # Return the Java type associated to a given Nit static type
904 fun java_type
: String do return "RTVal"
906 # Is the associated Java type a primitive one?
908 # ENSURE `result == (java_type != "Object")`
909 var is_java_primitive
: Bool is lazy
do return java_type
!= "RTVal"
912 redef class MClassType
914 redef var java_type
is lazy
do
915 if mclass
.name
== "Int" then
917 else if mclass
.name
== "Bool" then
919 else if mclass
.name
== "Char" then
921 else if mclass
.name
== "Float" then
923 else if mclass
.name
== "Byte" then
925 else if mclass
.name
== "NativeString" then
927 else if mclass
.name
== "NativeArray" then
937 private fun rt_name
: String do return "RTClass_{intro.mmodule.jname}_{jname}"
939 # Generate a Java RTClass for a Nit MClass
940 fun compile_to_java
(v
: JavaCompilerVisitor) do
941 v
.add
("public class {rt_name} extends RTClass \{")
942 v
.add
(" protected static RTClass instance;")
943 v
.add
(" private {rt_name}() \{")
944 v
.add
(" this.class_name = \"{name}\
";")
946 compile_type_table
(v
)
948 v
.add
(" public static RTClass get{rt_name}() \{")
949 v
.add
(" if(instance == null) \{")
950 v
.add
(" instance = new {rt_name}();")
952 v
.add
(" return instance;")
957 # Compile the virtual function table for the mclass
958 private fun compile_vft
(v
: JavaCompilerVisitor) do
959 # TODO handle generics
960 if mclass_type
.need_anchor
then return
961 var mclassdefs
= mclass_type
.collect_mclassdefs
(v
.compiler
.mainmodule
).to_a
962 v
.compiler
.mainmodule
.linearize_mclassdefs
(mclassdefs
)
964 var mainmodule
= v
.compiler
.mainmodule
965 for mclassdef
in mclassdefs
.reversed
do
966 for mprop
in mclassdef
.intro_mproperties
do
967 var mpropdef
= mprop
.lookup_first_definition
(mainmodule
, intro
.bound_mtype
)
968 if not mpropdef
isa MMethodDef then continue
969 var rt_name
= mpropdef
.rt_name
970 v
.add
("this.vft.put(\"{mprop.full_name}\
", {rt_name}.get{rt_name}());")
972 # fill super next definitions
973 while mpropdef
.has_supercall
do
974 var prefix
= mpropdef
.full_name
975 mpropdef
= mpropdef
.lookup_next_definition
(mainmodule
, intro
.bound_mtype
)
976 rt_name
= mpropdef
.rt_name
977 v
.add
("this.vft.put(\"{prefix}\
", {rt_name}.get{rt_name}());")
983 # Compile the type table for the MClass
984 fun compile_type_table
(v
: JavaCompilerVisitor) do
985 for pclass
in in_hierarchy
(v
.compiler
.mainmodule
).greaters
do
986 if pclass
== self then
987 v
.add
("supers.put(\"{pclass.jname}\
", this);")
989 v
.add
("supers.put(\"{pclass.jname}\
", {pclass.rt_name}.get{pclass.rt_name}());")
995 # Used as a common type between MMethod and MMethodDef for `table_send`
996 private interface TableCallable
1003 redef class MMethodDef
1007 private fun rt_name
: String do
1008 return "RTMethod_{mclassdef.mmodule.jname}_{mclassdef.mclass.jname}_{mproperty.jname}"
1011 # Generate a Java RTMethod for `self`
1012 fun compile_to_java
(v
: JavaCompilerVisitor) do
1013 v
.add
("public class {rt_name} extends RTMethod \{")
1014 v
.add
(" protected static RTMethod instance;")
1015 v
.add
(" public static RTMethod get{rt_name}() \{")
1016 v
.add
(" if(instance == null) \{")
1017 v
.add
(" instance = new {rt_name}();")
1019 v
.add
(" return instance;")
1022 v
.add
(" public RTVal exec(RTVal[] args) \{")
1023 compile_inside_to_java
(v
)
1028 # Compile the body of this function
1029 fun compile_inside_to_java
(v
: JavaCompilerVisitor) do
1031 var modelbuilder
= v
.compiler
.modelbuilder
1032 var node
= modelbuilder
.mpropdef2node
(self)
1035 # TODO compile abstract
1036 v
.info
("NOT YET IMPLEMENTED call to abstract method")
1037 v
.add
("return null;")
1041 if node
isa APropdef then
1042 node
.compile_to_java
(v
, self)
1043 else if node
isa AClassdef then
1044 # TODO compile attributes
1045 v
.info
("NOT YET IMPLEMENTED attribute handling")
1046 v
.add
("return null;")
1053 redef class APropdef
1055 # Compile that property definition to java code
1056 fun compile_to_java
(v
: JavaCompilerVisitor, mpropdef
: MMethodDef) do
1057 v
.info
("NOT YET IMPLEMENTED {class_name}::compile_to_java")
1061 redef class AMethPropdef
1062 redef fun compile_to_java
(v
, mpropdef
) do
1063 # TODO Call the implicit super-init
1065 # Compile intern methods
1066 if mpropdef
.is_intern
then
1067 v
.info
("NOT YET IMPLEMENTED {class_name}::compile_intern")
1068 # TODO if compile_intern_to_java(v, mpropdef, arguments) then return
1069 v
.add
("return null;")
1073 # Compile block if any
1074 var n_block
= n_block
1075 if n_block
!= null then
1083 # Try to compile self as an expression
1084 # Do not call this method directly, use `v.expr` instead
1085 private fun expr
(v
: JavaCompilerVisitor): nullable RuntimeVariable do
1086 v
.info
("NOT YET IMPLEMENTED {class_name}::expr")
1090 # Try to compile self as a statement
1091 # Do not call this method directly, use `v.stmt` instead
1092 private fun stmt
(v
: JavaCompilerVisitor) do expr
(v
)
1095 redef class ABlockExpr
1098 for e
in self.n_expr
do v
.stmt
(e
)
1102 var last
= self.n_expr
.last
1103 for e
in self.n_expr
do
1104 if e
== last
then break
1107 return v
.expr
(last
, null)
1111 redef class ASendExpr
1112 redef fun expr
(v
) do
1113 var recv
= v
.expr
(n_expr
, null)
1114 var callsite
= callsite
.as(not null)
1115 var args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, raw_arguments
)
1116 return v
.compile_callsite
(callsite
, args
)
1120 redef class ASelfExpr
1121 redef fun expr
(v
) do return v
.frame
.as(not null).arguments
.first
1124 redef class AImplicitSelfExpr
1125 redef fun expr
(v
) do return v
.frame
.as(not null).arguments
.first
1128 redef class AVardeclExpr
1129 redef fun stmt
(v
) do
1130 var variable
= self.variable
.as(not null)
1131 var ne
= self.n_expr
1132 var decl
= v
.variable
(variable
)
1134 var i
= v
.expr
(ne
, variable
.declared_type
)
1140 redef class AVarExpr
1141 redef fun expr
(v
) do
1142 return v
.variable
(self.variable
.as(not null))
1146 redef class AVarAssignExpr
1147 redef fun expr
(v
) do
1148 var variable
= self.variable
.as(not null)
1149 var i
= v
.expr
(self.n_value
, variable
.declared_type
)
1150 v
.assign
(v
.variable
(variable
), i
)
1155 redef class AIntExpr
1156 redef fun expr
(v
) do return v
.int_instance
(self.value
.as(not null))
1159 redef class AByteExpr
1160 redef fun expr
(v
) do return v
.byte_instance
(self.value
.as(not null))
1163 redef class AFloatExpr
1164 redef fun expr
(v
) do return v
.float_instance
("{self.n_float.text}") # FIXME use value, not n_float
1167 redef class ACharExpr
1168 redef fun expr
(v
) do return v
.char_instance
(self.value
.as(not null))
1171 redef class ATrueExpr
1172 redef fun expr
(v
) do return v
.bool_instance
(true)
1175 redef class AFalseExpr
1176 redef fun expr
(v
) do return v
.bool_instance
(false)
1179 redef class ANullExpr
1180 redef fun expr
(v
) do return v
.null_instance
1183 redef class AAbortExpr
1184 redef fun stmt
(v
) do v
.add_abort
("Aborted")
1187 redef class ADebugTypeExpr
1188 redef fun stmt
(v
) do end # do nothing