KT-15112, KT-15631

Revert changes for "tolerant to uninitialized values" in OptimizationBasicInterpreter:
this approach doesn't converge for some specific cases where local variable is reused
(e.g., in several inlined functions - see https://youtrack.jetbrains.com/issue/KT-15112).

Instead, treat fake always-false conditional jump in the beginning of the post-condition loop as a "reference point" for stack on loop break / continue.
This requires an extra abstraction layer in FixStackAnalyzer, since we can't perform fine-grain manipulations on Frames
(such as "combine frame C from local variables of frame A and stack of frame B").

NB additional NOPs will be generated for post-condition loops.
Should make a separate bytecode postprocessing pass to get rid of unnecessary NOPs
(several YT issues for perceived quality of the generated bytecode are about such NOPs).

This commit is contained in:

Dmitry Petrov

2017-01-11 13:46:33 +03:00

parent c09a71b178

commit ba933fa887

15 changed files with 289 additions and 146 deletions

compiler/testData/codegen/light-analysis/controlStructures/breakContinueInExpressions/pathologicalDoWhile.txt

Vendored

View File

@@ -0,0 +1,4 @@
 @kotlin.Metadata
 public final class PathologicalDoWhileKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }