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10 commits

Author SHA1 Message Date
Aliaksandr Kalenik
2d732b2251 LibJS: Skip allocating locals for arguments that allowed to be local
This allows us to get rid of instructions that move arguments to locals
and allocate smaller JS::Value vector in ExecutionContext by reusing
slots that were already allocated for arguments.

With this change for following function:
```js
function f(x, y) {
    return x + y;
}
```

we now produce following bytecode:
```
[   0]    0: Add dst:reg6, lhs:arg0, rhs:arg1
[  10]       Return value:reg6
```

instead of:
```
[   0]    0: GetArgument 0, dst:x~1
[  10]       GetArgument 1, dst:y~0
[  20]       Add dst:reg6, lhs:x~1, rhs:y~0
[  30]       Return value:reg6
```
2025-04-26 11:02:29 +02:00
Andreas Kling
3cf50539ec LibJS: Make Value() default-construct the undefined value
The special empty value (that we use for array holes, Optional<Value>
when empty and a few other other placeholder/sentinel tasks) still
exists, but you now create one via JS::js_special_empty_value() and
check for it with Value::is_special_empty_value().

The main idea here is to make it very unlikely to accidentally create an
unexpected special empty value.
2025-04-05 11:20:26 +02:00
Andreas Kling
3169747989 LibJS: Emit PutById instead of PutByValue when key is string literal
Basically convert o["foo"]=x into o.foo=x when emitting bytecode.
These are effectively the same thing, and the latter format opts
into using an inline cache for the property lookups.
2025-04-03 18:47:38 +02:00
Andreas Kling
4426c50a18 LibJS: Emit GetById instead of GetByValue when key is string literal
Basically convert o["foo"] into o.foo when emitting bytecode. These are
effectively the same thing, and the latter format opts into using an
inline cache for the property lookups.
2025-04-03 18:47:38 +02:00
Lucien Fiorini
5707076b9e LibJS: Optimize away Mov instructions when the source is the destination 2025-03-28 11:21:12 +00:00
Lucien Fiorini
6b6e13e28c LibJS: Avoid emptying the return value register in try/finally
This works because at the end of the finally chunk, a
ContinuePendingUnwind is generated which copies the saved return value
register into the return value register. In cases where
ContinuePendingUnwind is not generated such as when there is a break
statement in the finally block, the fonction will return undefined which
is consistent with V8 and SpiderMonkey.
2025-03-27 12:18:30 +00:00
Andreas Kling
46a5710238 LibJS: Use FlyString in PropertyKey instead of DeprecatedFlyString
This required dealing with *substantial* fallout.
2025-03-24 22:27:17 +00:00
Andreas Kling
3bfb0534be LibGC: Rename MarkedVector => RootVector
Let's try to make it a bit more clear that this is a Vector of GC roots.
2024-12-26 19:10:44 +01:00
Shannon Booth
f87041bf3a LibGC+Everywhere: Factor out a LibGC from LibJS
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:

 * JS::NonnullGCPtr -> GC::Ref
 * JS::GCPtr -> GC::Ptr
 * JS::HeapFunction -> GC::Function
 * JS::CellImpl -> GC::Cell
 * JS::Handle -> GC::Root
2024-11-15 14:49:20 +01:00
Timothy Flynn
93712b24bf Everywhere: Hoist the Libraries folder to the top-level 2024-11-10 12:50:45 +01:00
Renamed from Userland/Libraries/LibJS/Bytecode/Generator.h (Browse further)