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figure out label targets

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This commit is contained in:
Mihai Bazon
2012-09-15 16:05:01 +03:00
parent 86c14d0988
commit 4e0262bdfb
2 changed files with 28 additions and 3 deletions
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4
lib/ast.js
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@@ -287,7 +287,7 @@ var AST_Throw = DEFNODE("Throw", null, {
$documentation: "A `throw` statement"
}, AST_Exit);
var AST_LoopControl = DEFNODE("LoopControl", "label", {
var AST_LoopControl = DEFNODE("LoopControl", "label loopcontrol_target", {
$documentation: "Base class for loop control statements (`break` and `continue`)",
_walk: function(visitor) {
return visitor._visit(this, this.label && function(){
@@ -614,7 +614,7 @@ var AST_SymbolCatch = DEFNODE("SymbolCatch", null, {
$documentation: "Symbol naming the exception in catch",
}, AST_SymbolDeclaration);
var AST_Label = DEFNODE("Label", null, {
var AST_Label = DEFNODE("Label", "label_target", {
$documentation: "Symbol naming a label (declaration)",
}, AST_SymbolDeclaration);

27
lib/scope.js
View File

@@ -101,8 +101,28 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(){
}
if (node instanceof AST_Label) {
node.init_scope_vars();
var p = tw.parent(); // AST_LabeledStatement
var block = p.body;
if (block instanceof AST_StatementWithBody)
block = block.body;
node.label_target = block;
}
if (node instanceof AST_SymbolLambda) {
if (node instanceof AST_LoopControl) {
if (!node.label) {
var a = tw.stack, i = a.length - 1;
while (--i >= 0) {
var p = a[i];
if (p instanceof AST_For
|| p instanceof AST_ForIn
|| p instanceof AST_DWLoop
|| p instanceof AST_Switch) {
node.loopcontrol_target = p.body;
break;
}
}
}
}
else if (node instanceof AST_SymbolLambda) {
scope.def_function(node);
}
else if (node instanceof AST_SymbolDefun) {
@@ -272,6 +292,11 @@ AST_Symbol.DEFMETHOD("global", function(){
return this.definition().global;
});
AST_LoopControl.DEFMETHOD("target", function(){
if (this.label) return this.label.definition().label_target;
return this.loopcontrol_target;
});
AST_Toplevel.DEFMETHOD("mangle_names", function(){
// We only need to mangle declaration nodes. Special logic wired
// into the code generator will display the mangled name if it's