Fix test_ios #1
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Fix test_ios #1
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safaiyeh
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Jul 17, 2020
Summary: While in theory we should never delete views before removing them from the hierarchy, there are some exceptions: (1) Some mysterious cases that don't seem like bugs, but where the child still seems to keep a reference to the parent: (2) When deleting views as part of stopSurface. On #1: in the past we had issues when we assumed that ViewManager.getChildCount() would return an accurate count. Sometimes it's just... wrong. Here, I've found at least one case where a View still has a parent after it's removed from the View hierarchy. I assume this is undocumented Android behavior or an Android bug, but either way, there's nothing I can do about it. On #2: there are valid cases where we want to delete a View without explicitly removing it from the View hierarchy (it will eventually be removed from the hierarchy when the Root view is unmounted, but it may still be "in" a View hierarchy when it's deleted). Changelog: [Internal] Reviewed By: mdvacca Differential Revision: D22321374 fbshipit-source-id: 9667bbe778c418f0216550638dc26ca48a58e5fa
safaiyeh
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Oct 26, 2020
Summary:
changelog: [internal]
Prevents 2 type converions:
1. int <-> size_t
2. int <-> int32_t
# Why is using size_t better when working with indexes.
## 1. Type conversion isn't for free.
Take this example
```
size_t calculate(int number) {
return number + 1;
}
```
It generates following assembly (generated with armv8-a clang 10.0.0):
```
calculate(int): // calculate(int)
sub sp, sp, facebook#16 // =16
str w0, [sp, facebook#12]
ldr w8, [sp, facebook#12]
add w9, w8, #1 // =1
mov w8, w9
sxtw x0, w8
add sp, sp, facebook#16 // =16
ret
```
That's 9 instructions.
If we get rid of type conversion:
```
size_t calculate(size_t number) {
return number + 1;
}
```
Assembly (generated with armv8-a clang 10.0.0):
```
calculate(unsigned long): // calculate(unsigned long)
sub sp, sp, facebook#16 // =16
str x0, [sp, facebook#8]
ldr x8, [sp, facebook#8]
add x0, x8, #1 // =1
add sp, sp, facebook#16 // =16
ret
```
Compiler now produces only 7 instructions.
## Semantics
When using int for indexing, the type doesn't say much. By using `size_t`, just by looking at the type, it gives the reader more information about where it is coming from.
Reviewed By: JoshuaGross
Differential Revision: D24332248
fbshipit-source-id: 87ef982829ec14906ed9e002ea2e875fda4a0cd8
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