Sebastian Markbåge

Include JSX Extension

24

I thought I'd open the discussion around move the JSX extension to the ESTree repo. It could go into an experimental extensions section since it is not part of the...

[WIP] Introduce Concept of Widened Identity to Object Templates

4

Release notes: none _This build on top of #2539. Easier to review the individual commits at the end._ This introduces the concept of an object template whose identity is known...

Emit Mutations to Abstract Templates on the AbstractValue instead of the ObjectValue

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Release notes: adds externalTemplate modeling option for template objects Currently we emit generator entries when we mutate intrinsic objects. When we create abstract objects with a template, we end up...

[WIP] Drop the notion of a "template" in an AbstractObjectValue

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_There are still a few more little things to fix before this can work._ There is no practical difference between an abstract object with a single object in its values...

LLVM Backend

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This lets us Prepack to native machine code or WebAssembly - without a JS runtime. Prepack knows a lot about a program that it can evaluate. It is also highly...

```js (function() { let a = global.__abstract ? __makeSimple(__abstract("array", "[1, 2, 3]")) : [1, 2, 3]; let i = 0; var o = {x:0}; do { i++; o.x = i;...

```js let a = global.__abstract ? __makeSimple(__abstract("array", "[1, 2, 3]")) : [1, 2, 3]; let i = 0; var o = {x:0}; do { i++; o[Symbol.iterator] = i; } while...

Revisit "widened property" mechanism

1

I find the mechanism to define a widened property as a value a bit awkward. It has many special cases. It leads to some tricky serialization issues when we try...

Accessing a Widened Property Key Doesn't Snapshot or Havoc

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```js var n = __abstract('number', '(2)'); var i = 0; var obj = {0:'a', 1:'b', 2:'c'}; __makePartial(obj); __makeSimple(obj); do { result = obj['' + i]; i++; } while (i <...

```js var n = __abstract('number', '(3)'); var i = 0; var ii = 0; var obj = {} do { obj[i] = 5; obj[ii] = 6; obj[i + 1000] =...