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The following presentation is provided under DHMB
license (Do Not Hurt My Brain).
Lecturer is not responsible for the financial and
moral damages resulting from taking too seriously
the content of the presentation.
Including permanent damage to neurons, reduction of
neurotransmitter activity at the molecular level
and group dismissal.
Patterns for JVM languages
Polish JUG, 2014
about me
work://chief_architect@lumesse
owner://symentis.pl
twitter://j_palka
blog://geekyprimitives.wordpress.com
scm:bitbucket://kcrimson
scm:github://kcrimson
JVM
is
the
new
assembler
translator
interpreter
compiler
source code
↓
target language source code
↓
machine code || interpreter
source code
↓
execution results
source code
↓
machine code
So how does it all work?
source code
↓lexer
token stream
↓parser
IR
Intermediate Representation
visitor
listener
tree
Syntax tree
local y = 1
x = 1 + y
fragment
DIGIT
:
[0-9]
;
fragment
LETTER
:
[a-zA-Z]
;
String
:
''' .*? '''
| '"' .*? '"'
;
Number
:
DIGIT+
;
Name
:
(
'_'
| LETTER
)
(
'_'
| LETTER
| DIGIT
)*
;
COMMENT
:
'--' .*? 'n' -> skip
;
NL
:
'r'? 'n' -> skip
;
WS
:
[ tf]+ -> skip
;
[@0,[0..1)='x',<49>]
[@1,[2..3)='=',<36>]
[@2,[4..5)='1',<48>]
[@3,[6..7)='+',<33>]
[@4,[8..15)='"Hello"',<47>]
[@5,[15..16)=';',<37>]
[@6,[17..17)='',<-1=EOF>]
varlist returns [Varlist result]
:
var
{$result = createVarlist($var.result);}
(
',' var
{$result = createVarlist($result,$var.result);}
)*
;
//
var returns [Var result]
:
Name
{ $result = createVariableName($Name.text); }
| prefixexp '[' exp ']'
| prefixexp '.' Name
;
beware of left recursion
translator
interpreter
compiler
Interpreter pattern
Non terminal nodes
Terminal nodes
package pl.symentis.lua.grammar;
import pl.symentis.lua.runtime.Context;
public interface Statement {
void execute(Context context);
}
package pl.symentis.lua.grammar;
import pl.symentis.lua.runtime.Context;
public interface Expression<T> {
T evaluate(Context ctx);
}
package pl.symentis.lua.runtime;
public interface Context {
VariableRef resolveVariable(String name);
Scope enterScope();
Scope exitScope();
}
package pl.symentis.lua.runtime;
public interface Scope {
Scope getOuterScope();
VariableRef resolveVariable(String name);
void bindVariable(String name, Object value);
}
translator
interpreter
compiler
compiler → byte code
org.ow2.asm:asm:jar
me.qmx.jitescript:jitescript:jar
JiteClass jiteClass = new JiteClass(classname,new String[] { p(Statement.class) });
jiteClass.defineDefaultConstructor();
// parse file and start to walk through AST visitor
final CodeBlock codeBlock = newCodeBlock();
chunk.accept(new CompilerVisitor(codeBlock));
codeBlock.voidreturn();
jiteClass.defineMethod("execute", JiteClass.ACC_PUBLIC,
sig(void.class, new Class[] { Context.class }), codeBlock);
return jiteClass.toBytes(JDKVersion.V1_7);
When writing bytecode compiler it helps to think
about Java code
But at the end you need to think like stack machine :)
@Override
public void execute(Context context) {
x = valueOf(1).plus(valueOf(2));
}
public void visitExpression(CodeBlock codeBlock) {
codeBlock.ldc(2);
codeBlock.invokestatic(p(Integer.class), "valueOf",sig(Integer.class, int.class));
codeBlock.invokestatic(p(LuaTypes.class), "valueOf",sig(LuaType.class,Object.class));
codeBlock.astore(2);
codeBlock.ldc(1);
codeBlock.invokestatic(p(Integer.class), "valueOf",sig(Integer.class, int.class));
codeBlock.invokestatic(p(LuaTypes.class), "valueOf",
sig(LuaType.class, Object.class));
codeBlock.aload(2);
codeBlock.invokeinterface(p(LuaType.class), "plus",sig(LuaType.class,
LuaType.class));
codeBlock.astore(3);
}
Symbol table
maps variable locals to its symbolic name
Pillars of every language design
Visibility
Types
Runtime
What's next?
Just let me know
type analisys and optimizations
invokedynamic
graal + truffle
Or interpreter/compiler hackathon

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Patterns for JVM languages