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Add basic boolean sub-expression type inference.

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This commit is contained in:
James Roseborough
2010-07-27 14:37:42 +00:00
parent 3ad0006e8e
commit f236b23bf8
1 changed files with 45 additions and 3 deletions
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48
src/jse/org/luaj/vm2/lua2java/JavaCodeGen.java
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@@ -353,6 +353,48 @@ public class JavaCodeGen {
return popWriter(x);
}
public String evalBoolean(Exp exp) {
Writer x = pushWriter();
callerExpects.put(exp,LuaValue.TBOOLEAN);
final Visitor plain = this;
exp.accept(new Visitor() {
public void visit(UnopExp exp) {
switch ( exp.op ) {
case Lua.OP_NOT: out( "(!"+evalBoolean( exp.rhs )+")"); break;
default: plain.visit(exp); out(".toboolean()"); break;
}
}
public void visit(BinopExp exp) {
switch ( exp.op ) {
case Lua.OP_AND:
case Lua.OP_OR:
String op = (exp.op==Lua.OP_AND? " && ": " || ");
out("("+evalBoolean(exp.lhs)+op+evalBoolean(exp.rhs)+")");
break;
default:
plain.visit(exp); out(".toboolean()");
break;
}
}
public void visit(VarargsExp exp) {
plain.visit(exp); out(".toboolean(1)");
}
public void visit(ParensExp exp) {
evalBoolean(exp.exp);
}
public void visit(FieldExp exp) {
plain.visit(exp); out(".toboolean()");
}
public void visit(IndexExp exp) {
plain.visit(exp); out(".toboolean()");
}
public void visit(NameExp exp) {
plain.visit(exp); out(".toboolean()");
}
});
return popWriter(x);
}
public void visit(FuncCallStat stat) {
outi("");
stat.funccall.accept(this);
@@ -723,12 +765,12 @@ public class JavaCodeGen {
}
public void visit(IfThenElse stat) {
outb( "if ( "+evalLuaValue(stat.ifexp)+".toboolean() ) {");
outb( "if ( "+evalBoolean(stat.ifexp)+" ) {");
super.visit(stat.ifblock);
if ( stat.elseifblocks != null )
for ( int i=0, n=stat.elseifblocks.size(); i<n; i++ ) {
subindent();
outl( "} else if ( "+evalLuaValue(stat.elseifexps.get(i))+".toboolean() ) {");
outl( "} else if ( "+evalBoolean(stat.elseifexps.get(i))+" ) {");
addindent();
super.visit(stat.elseifblocks.get(i));
}
@@ -744,7 +786,7 @@ public class JavaCodeGen {
public void visit(RepeatUntil stat) {
outb( "do {");
super.visit(stat.block);
oute( "} while (!"+evalLuaValue(stat.exp)+".toboolean());" );
oute( "} while (!"+evalBoolean(stat.exp)+");" );
}
public void visit(TableConstructor table) {