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Fixes preprocessor testing and adds deadcode removal.

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This commit is contained in:
Yury Delendik 2017-01-09 13:15:09 -06:00
parent f828f07ccd
commit 6265bb6038
7 changed files with 100 additions and 46 deletions
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40
external/builder/preprocessor2.js vendored
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@ -169,22 +169,38 @@ function postprocessNode(ctx, node) {
case 'BlockStatement':
var subExpressionIndex = 0;
while (subExpressionIndex < node.body.length) {
if (node.body[subExpressionIndex].type === 'EmptyStatement') {
// Removing empty statements from the blocks.
node.body.splice(subExpressionIndex, 1);
continue;
}
if (node.body[subExpressionIndex].type === 'BlockStatement') {
// Block statements inside a block are moved to the parent one.
var subChildren = node.body[subExpressionIndex].body;
Array.prototype.splice.apply(node.body,
[subExpressionIndex, 1].concat(subChildren));
subExpressionIndex += subChildren.length;
continue;
switch (node.body[subExpressionIndex].type) {
case 'EmptyStatement':
// Removing empty statements from the blocks.
node.body.splice(subExpressionIndex, 1);
continue;
case 'BlockStatement':
// Block statements inside a block are moved to the parent one.
var subChildren = node.body[subExpressionIndex].body;
Array.prototype.splice.apply(node.body,
[subExpressionIndex, 1].concat(subChildren));
subExpressionIndex += Math.max(subChildren.length - 1, 0);
continue;
case 'ReturnStatement':
case 'ThrowStatement':
// Removing dead code after return or throw.
node.body.splice(subExpressionIndex + 1,
node.body.length - subExpressionIndex - 1);
break;
}
subExpressionIndex++;
}
break;
case 'FunctionDeclaration':
case 'FunctionExpression':
var block = node.body;
if (block.body.length > 0 &&
block.body[block.body.length - 1].type === 'ReturnStatement' &&
!block.body[block.body.length - 1].argument) {
// Function body ends with return without arg -- removing it.
block.body.pop();
}
break;
}
return node;
}