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Fix name shadowing problem in compiler

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Names in a scope should create shadow copies of names in enclosing scopes.

BUG=5382396

Review URL: https://chromereviews.googleplex.com/3543020

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@147 260f80e4-7a28-3924-810f-c04153c831b5
This commit is contained in:
zundel@google.com
2011-10-06 19:17:31 +00:00
parent be8e6320b3
commit 6bd18f8086
3 changed files with 36 additions and 13 deletions
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compiler/java/com/google/dart/compiler/backend/js/GenerateNamesAndScopes.java
+32 -7
View File
@@ -49,7 +49,8 @@ class GenerateNamesAndScopes extends NormalizedVisitor {
private final Deque<JsScope> scopes = new LinkedList<JsScope>();
private DartClass currentClass = null;
private int nextLabelId = 0;
private int labelUniqifier = 0; // to resolve label name collisions.
private int varUniqifier = 0; // to resolve variable name collisions.
private final TranslationContext translationContext;
private final LibraryElement unitLibrary;
@@ -124,20 +125,20 @@ class GenerateNamesAndScopes extends NormalizedVisitor {
public boolean visit(DartParameter x, DartContext ctx) {
// TODO(ngeoffray): A parameter in a function type does not have a symbol.
if (x.getSymbol() != null) {
declare(x.getSymbol(), x.getParameterName());
declareExclusively(x.getSymbol(), x.getParameterName());
}
return true;
}
@Override
public boolean visit(DartVariable x, DartContext ctx) {
declare(x.getSymbol(), x.getVariableName());
declareExclusively(x.getSymbol(), x.getVariableName());
return true;
}
@Override
public boolean visit(DartLabel x, DartContext ctx) {
declare(x.getSymbol(), "L" + nextLabelId++);
declareExclusively(x.getSymbol(), String.format("L%X", labelUniqifier++));
return true;
}
@@ -163,7 +164,7 @@ class GenerateNamesAndScopes extends NormalizedVisitor {
}
private JsName function(Symbol symbol, String name, String originalName, DartFunction func) {
JsName jsName = name != null ? declare(symbol, name, originalName) : null;
JsName jsName = name != null ? declareExclusively(symbol, name, originalName) : null;
JsFunction jsFunc = new JsFunction(scopes.peek(), jsName);
jsFunc.setFromDart(true);
scopes.push(jsFunc.getScope());
@@ -175,8 +176,32 @@ class GenerateNamesAndScopes extends NormalizedVisitor {
return declareInScope(scopes.peek(), x, name, originalName);
}
private JsName declare(Symbol x, String name) {
return declareInScope(scopes.peek(), x, name, name);
private JsName declareExclusively(Symbol x, String name, String originalName) {
return declareExclusivelyInScope(scopes.peek(), x, name, originalName);
}
private JsName declareExclusively(Symbol x, String name) {
return declareExclusivelyInScope(scopes.peek(), x, name, name);
}
private static final int BIG_PRIME_UNDER_0XFFFFF = 985531;
/**
* Create a unique name for this variable in this scope.
*
* Try to keep this from being a linear scan of the namespace, and keep
* it under 5 hex digits (over 1,000,000 unique suffixes).
*
*/
private JsName declareExclusivelyInScope(JsScope scope, Symbol x,
String name, String originalName) {
String mappedName = name;
int offset = 0;
while (scope.findExistingName(mappedName) != null) {
mappedName = String.format("%s_%X", mappedName, varUniqifier);
varUniqifier = (varUniqifier + offset++) % BIG_PRIME_UNDER_0XFFFFF;
}
return declareInScope(scope, x, mappedName, originalName);
}
private JsName declareInScope(JsScope scope, Symbol x, String name, String originalName) {