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kotlin-fork/compiler/fir/analysis-tests/testData/resolve/smartcasts/boundSmartcasts/functionCallBound.dot
T
pyos aadea0e26f FIR CFA: properly visit subgraphs in checkers
Interpretation: a graph A is a subgraph of B if information available at
nodes of A depends on the paths taken in B. For example, local classes
are subgraphs of a graph in which they are declared, and members of
those classes are subgraphs of the local class itself - because these
members can reference captured values.

Consequences:

 * if graph G is a subgraph of node N, then G is a subgraph of N's
   owner;
 * `ControlFlowAnalysisDiagnosticComponent` will only visit root graphs;
 * `graph.traverse` will ignore subgraph boundaries, as if all subgraphs
   are inlined into one huge root graph;
 * if a control flow checker needs information from a declaration to
   which a graph is attached, it must look at subgraphs explicitly.

For example, consider the `callsInPlace` checker. When a function
has a `callsInPlace` contract and a local declaration, the checker must
visit that local declaration to ensure it does not capture the allegedly
called-in-place argument - hence `graph.traverse` will look at the
nodes. However, the local declaration can also be a function with its
own `callsInPlace` contracts, so the checker should also run for it in
isolation. If that sounds quadratic, that's because unfortunately it is.
2023-01-10 15:40:48 +02:00

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digraph functionCallBound_kt {
graph [nodesep=3]
node [shape=box penwidth=2]
edge [penwidth=2]
subgraph cluster_0 {
color=red
0 [label="Enter function <init>" style="filled" fillcolor=red];
1 [label="Delegated constructor call: super<R|kotlin/Any|>()" style="filled" fillcolor=yellow];
2 [label="Exit function <init>" style="filled" fillcolor=red];
}
0 -> {1};
1 -> {2};
subgraph cluster_1 {
color=red
3 [label="Enter class Base" style="filled" fillcolor=red];
4 [label="Exit class Base" style="filled" fillcolor=red];
}
3 -> {4} [color=green];
subgraph cluster_2 {
color=red
5 [label="Enter function <init>" style="filled" fillcolor=red];
6 [label="Delegated constructor call: super<R|Base|>()" style="filled" fillcolor=yellow];
7 [label="Exit function <init>" style="filled" fillcolor=red];
}
5 -> {6};
6 -> {7};
subgraph cluster_3 {
color=red
11 [label="Enter class Sub" style="filled" fillcolor=red];
12 [label="Part of class initialization"];
subgraph cluster_4 {
color=blue
8 [label="Enter property" style="filled" fillcolor=red];
9 [label="Access variable R|<local>/data|"];
10 [label="Exit property" style="filled" fillcolor=red];
}
13 [label="Exit class Sub" style="filled" fillcolor=red];
}
11 -> {12} [color=green];
12 -> {8} [color=green];
12 -> {13} [style=dotted];
12 -> {8} [style=dashed];
8 -> {9};
9 -> {10};
10 -> {13} [color=green];
subgraph cluster_5 {
color=red
14 [label="Enter function isOk" style="filled" fillcolor=red];
subgraph cluster_6 {
color=blue
15 [label="Enter block"];
16 [label="Const: Boolean(true)"];
17 [label="Jump: ^isOk Boolean(true)"];
18 [label="Stub" style="filled" fillcolor=gray];
19 [label="Exit block" style="filled" fillcolor=gray];
}
20 [label="Exit function isOk" style="filled" fillcolor=red];
}
14 -> {15};
15 -> {16};
16 -> {17};
17 -> {20};
17 -> {18} [style=dotted];
18 -> {19} [style=dotted];
19 -> {20} [style=dotted];
subgraph cluster_7 {
color=red
21 [label="Enter function check" style="filled" fillcolor=red];
subgraph cluster_8 {
color=blue
22 [label="Enter block"];
subgraph cluster_9 {
color=blue
23 [label="Enter when"];
subgraph cluster_10 {
color=blue
24 [label="Enter when branch condition "];
25 [label="Access variable R|<local>/base|"];
26 [label="Type operator: (R|<local>/base| as? R|Sub|)"];
27 [label="Enter safe call"];
28 [label="Function call: $subj$.R|/isOk|()" style="filled" fillcolor=yellow];
29 [label="Exit safe call"];
30 [label="Const: Boolean(true)"];
31 [label="Equality operator =="];
32 [label="Exit when branch condition"];
}
subgraph cluster_11 {
color=blue
33 [label="Enter when branch condition else"];
34 [label="Exit when branch condition"];
}
35 [label="Enter when branch result"];
subgraph cluster_12 {
color=blue
36 [label="Enter block"];
37 [label="Access variable R|<local>/base|"];
38 [label="Exit block"];
}
39 [label="Exit when branch result"];
40 [label="Enter when branch result"];
subgraph cluster_13 {
color=blue
41 [label="Enter block"];
42 [label="Access variable R|<local>/base|"];
43 [label="Smart cast: R|<local>/base|"];
44 [label="Access variable R|/Sub.data|"];
45 [label="Exit block"];
}
46 [label="Exit when branch result"];
47 [label="Exit when"];
}
48 [label="Jump: ^check when () {
==((R|<local>/base| as? R|Sub|)?.{ $subj$.R|/isOk|() }, Boolean(true)) -> {
R|<local>/base|.R|/Sub.data|
}
else -> {
R|<local>/base|
}
}
"];
49 [label="Stub" style="filled" fillcolor=gray];
50 [label="Exit block" style="filled" fillcolor=gray];
}
51 [label="Exit function check" style="filled" fillcolor=red];
}
21 -> {22};
22 -> {23};
23 -> {24};
24 -> {25};
25 -> {26};
26 -> {27 29};
27 -> {28};
28 -> {29};
29 -> {30};
30 -> {31};
31 -> {32};
32 -> {33 40};
33 -> {34};
34 -> {35};
35 -> {36};
36 -> {37};
37 -> {38};
38 -> {39};
39 -> {47};
40 -> {41};
41 -> {42};
42 -> {43};
43 -> {44};
44 -> {45};
45 -> {46};
46 -> {47};
47 -> {48};
48 -> {51};
48 -> {49} [style=dotted];
49 -> {50} [style=dotted];
50 -> {51} [style=dotted];
}