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FIR CFG: add union nodes

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Quick quiz:

 Q: In a CFG, what does `a -> b -> c -> d` mean?
 A: `a`, then `b`, then `c`, then `d`.

 Q: In a CFG, what does `a -> b -> d; a -> c -> d` mean?
 A: `a`, then `b` or `c`, then `d`.

 Q: So how do you encode "a, then (b, then c) or (c, then b), then d`?
 A: You can't.

Problem is, you need to, because that's what `a; run2({ b }, { c }); d`
does when `run2` has a contract that it calls both its lambda arguments
in-place: `shuffle(listOf(block1, block2)).forEach { it() }` is a
perfectly valid implementation for it, as little sense as that makes.

So that's what union nodes solve. When a node implements
`UnionNodeMarker`, its inputs are interpreted as "all visited in some
order" instead of the normal "one of the inputs is visited".

Currently this is used for data flow. It *should* also be used for
control flow, but it isn't. But it should be. But that's not so easy.

BTW, `try` exit is NOT a union node; although lambdas in one branch can
be completed according to types' of lambdas in another, data does not
flow between the branches anyway (since we don't know how much of the
`try` executed before jumping into `catch`, and `catch`es are mutually
exclusive) so a `try` expression is more like `when` than a function
call with called-in-place-exactly-once arguments. The fact that
`exitTryExpression` used `processUnionOfArguments` in a weird way
should've hinted at that, but now we know for certain.
This commit is contained in:
pyos
2022-11-17 12:53:35 +01:00
committed by teamcity
parent 99bebfa183
commit a9be27e330
108 changed files with 4050 additions and 4239 deletions
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compiler/fir/analysis-tests/testData/resolveWithStdlib/delegates/delegateWithAnonymousObject.dot
Vendored
+12 -12
View File
@@ -6,7 +6,7 @@ digraph delegateWithAnonymousObject_kt {
subgraph cluster_0 {
color=red
0 [label="Enter function <init>" style="filled" fillcolor=red];
1 [label="Delegated constructor call: super<R|kotlin/Any|>()"];
1 [label="Delegated constructor call: super<R|kotlin/Any|>()" style="filled" fillcolor=yellow];
2 [label="Exit function <init>" style="filled" fillcolor=red];
}
0 -> {1};
@@ -26,7 +26,7 @@ digraph delegateWithAnonymousObject_kt {
color=blue
6 [label="Enter block"];
7 [label="Const: Null(null)"];
8 [label="Check not null: Null(null)!!"];
8 [label="Check not null: Null(null)!!" style="filled" fillcolor=yellow];
9 [label="Stub" style="filled" fillcolor=gray];
10 [label="Jump: ^delegate Null(null)!!" style="filled" fillcolor=gray];
11 [label="Stub" style="filled" fillcolor=gray];
@@ -47,7 +47,7 @@ digraph delegateWithAnonymousObject_kt {
subgraph cluster_4 {
color=red
14 [label="Enter function <init>" style="filled" fillcolor=red];
15 [label="Delegated constructor call: super<R|DelegateProvider<IssueListView>|>()"];
15 [label="Delegated constructor call: super<R|DelegateProvider<IssueListView>|>()" style="filled" fillcolor=yellow];
16 [label="Exit function <init>" style="filled" fillcolor=red];
}
14 -> {15};
@@ -77,7 +77,7 @@ digraph delegateWithAnonymousObject_kt {
subgraph cluster_8 {
color=red
23 [label="Enter function <init>" style="filled" fillcolor=red];
24 [label="Delegated constructor call: super<R|DelegateProvider<IssuesListUserProfile>|>()"];
24 [label="Delegated constructor call: super<R|DelegateProvider<IssuesListUserProfile>|>()" style="filled" fillcolor=yellow];
25 [label="Exit function <init>" style="filled" fillcolor=red];
}
23 -> {24};
@@ -118,7 +118,7 @@ digraph delegateWithAnonymousObject_kt {
subgraph cluster_12 {
color=red
35 [label="Enter function <init>" style="filled" fillcolor=red];
36 [label="Delegated constructor call: super<R|kotlin/Any|>()"];
36 [label="Delegated constructor call: super<R|kotlin/Any|>()" style="filled" fillcolor=yellow];
37 [label="Exit function <init>" style="filled" fillcolor=red];
}
35 -> {36};
@@ -130,7 +130,7 @@ digraph delegateWithAnonymousObject_kt {
subgraph cluster_14 {
color=blue
39 [label="Enter block"];
40 [label="Function call: R|/IssueListView.IssueListView|()"];
40 [label="Function call: R|/IssueListView.IssueListView|()" style="filled" fillcolor=yellow];
41 [label="Jump: ^getValue R|/IssueListView.IssueListView|()"];
42 [label="Stub" style="filled" fillcolor=gray];
43 [label="Exit block" style="filled" fillcolor=gray];
@@ -151,9 +151,9 @@ digraph delegateWithAnonymousObject_kt {
subgraph cluster_16 {
color=blue
46 [label="Enter block"];
47 [label="Function call: R|/IssueListView.IssueListView|()"];
47 [label="Function call: R|/IssueListView.IssueListView|()" style="filled" fillcolor=yellow];
48 [label="Access variable R|<local>/value|"];
49 [label="Function call: R|/IssueListView.IssueListView|().R|/IssueListView.updateFrom|(...)"];
49 [label="Function call: R|/IssueListView.IssueListView|().R|/IssueListView.updateFrom|(...)" style="filled" fillcolor=yellow];
50 [label="Jump: ^setValue R|/IssueListView.IssueListView|().R|/IssueListView.updateFrom|(R|<local>/value|)"];
51 [label="Stub" style="filled" fillcolor=gray];
52 [label="Exit block" style="filled" fillcolor=gray];
@@ -178,7 +178,7 @@ digraph delegateWithAnonymousObject_kt {
55 [label="Enter block"];
56 [label="Access variable D|/IssuesListUserProfile.issueListView|"];
57 [label="Access variable this@R|/IssuesListUserProfile|"];
58 [label="Function call: this@R|/IssuesListUserProfile|.D|/IssuesListUserProfile.issueListView|.R|SubstitutionOverride<kotlin/properties/ReadWriteProperty.getValue: R|Stub (chain inference): TypeVariable(_Target)|>|(...)"];
58 [label="Function call: this@R|/IssuesListUserProfile|.D|/IssuesListUserProfile.issueListView|.R|SubstitutionOverride<kotlin/properties/ReadWriteProperty.getValue: R|Stub (chain inference): TypeVariable(_Target)|>|(...)" style="filled" fillcolor=yellow];
59 [label="Jump: ^ this@R|/IssuesListUserProfile|.D|/IssuesListUserProfile.issueListView|.R|SubstitutionOverride<kotlin/properties/ReadWriteProperty.getValue: R|Stub (chain inference): TypeVariable(_Target)|>|(this@R|/IssuesListUserProfile|, ::R|/IssuesListUserProfile.issueListView|)"];
60 [label="Stub" style="filled" fillcolor=gray];
61 [label="Exit block" style="filled" fillcolor=gray];
@@ -204,7 +204,7 @@ digraph delegateWithAnonymousObject_kt {
65 [label="Access variable D|/IssuesListUserProfile.issueListView|"];
66 [label="Access variable this@R|/IssuesListUserProfile|"];
67 [label="Access variable R|<local>/issueListView|"];
68 [label="Function call: this@R|/IssuesListUserProfile|.D|/IssuesListUserProfile.issueListView|.R|SubstitutionOverride<kotlin/properties/ReadWriteProperty.setValue: R|kotlin/Unit|>|(...)"];
68 [label="Function call: this@R|/IssuesListUserProfile|.D|/IssuesListUserProfile.issueListView|.R|SubstitutionOverride<kotlin/properties/ReadWriteProperty.setValue: R|kotlin/Unit|>|(...)" style="filled" fillcolor=yellow];
69 [label="Exit block"];
}
70 [label="Exit function setter" style="filled" fillcolor=red];
@@ -222,9 +222,9 @@ digraph delegateWithAnonymousObject_kt {
71 [label="Enter property" style="filled" fillcolor=red];
72 [label="Postponed enter to lambda"];
73 [label="Postponed exit from lambda"];
74 [label="Function call: this@R|/IssuesListUserProfile|.R|/delegate|<R|IssuesListUserProfile|, R|IssuesListUserProfile|, R|IssueListView|>(...)"];
74 [label="Function call: this@R|/IssuesListUserProfile|.R|/delegate|<R|IssuesListUserProfile|, R|IssuesListUserProfile|, R|IssueListView|>(...)" style="filled" fillcolor=yellow];
75 [label="Access variable this@R|/IssuesListUserProfile|"];
76 [label="Function call: this@R|/IssuesListUserProfile|.R|/delegate|<R|IssuesListUserProfile|, R|IssuesListUserProfile|, R|IssueListView|>(...).<Unresolved name: provideDelegate>#(...)"];
76 [label="Function call: this@R|/IssuesListUserProfile|.R|/delegate|<R|IssuesListUserProfile|, R|IssuesListUserProfile|, R|IssueListView|>(...).<Unresolved name: provideDelegate>#(...)" style="filled" fillcolor=yellow];
77 [label="Exit property" style="filled" fillcolor=red];
}
71 -> {72};