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fb6eafddf1
Simplify ifs when branches have condition true/false.
Simplify blocks containing only a variable declaration
and a variable get of the same variable. Simplify to
just the condition.
Do not introduce temporary variables for constants for
null checks. Constants have no side-effects and can be
reloaded freely instead of going through a local.
This simplifies code such as "42.toLong()!!" so that the
resulting code has no branches and uses no locals. The
simplifications happen as follows:
```
block
temp = 42.toLong()
when
(temp == null) throw NPE
(true) load temp
---> null test simplification
block
temp = 42.toLong()
when
(false) throw NPE
(true) load temp
---> when simplification
block
temp = 42.toLong()
load temp
---> block simplification
42.toLong()
```
39 lines
648 B
Kotlin
Vendored
39 lines
648 B
Kotlin
Vendored
class MyString {
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var s = ""
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operator fun plus(x : String) : MyString {
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s += x
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return this
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}
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override fun toString(): String {
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return s
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}
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}
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fun test1() : MyString {
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var r = MyString()
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try {
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r + "Try1"
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try {
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r + "Try2"
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if (true)
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return r
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} finally {
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r + "Finally2"
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if (true) {
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return r
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}
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}
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return r
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} finally {
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r + "Finally1"
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}
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}
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fun box(): String {
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return if (test1().toString() == "Try1Try2Finally2Finally1") "OK" else "fail: ${test1()}"
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} |