pyos
a9be27e330
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.
104 lines
3.1 KiB
Plaintext
Vendored
104 lines
3.1 KiB
Plaintext
Vendored
digraph secondaryConstructorCfg_kt {
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graph [nodesep=3]
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node [shape=box penwidth=2]
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edge [penwidth=2]
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subgraph cluster_0 {
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color=red
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0 [label="Enter function <init>" style="filled" fillcolor=red];
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1 [label="Delegated constructor call: super<R|kotlin/Any|>()" style="filled" fillcolor=yellow];
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2 [label="Exit function <init>" style="filled" fillcolor=red];
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}
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0 -> {1};
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1 -> {2};
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subgraph cluster_1 {
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color=red
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3 [label="Enter property" style="filled" fillcolor=red];
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4 [label="Access variable R|<local>/p0|"];
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5 [label="Exit property" style="filled" fillcolor=red];
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}
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3 -> {4};
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4 -> {5};
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5 -> {29} [color=green];
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subgraph cluster_2 {
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color=red
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6 [label="Enter property" style="filled" fillcolor=red];
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7 [label="Access variable R|<local>/p0|"];
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8 [label="Access variable R|kotlin/String.length|"];
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9 [label="Exit property" style="filled" fillcolor=red];
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}
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6 -> {7};
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7 -> {8};
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8 -> {9};
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9 -> {30} [color=green];
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subgraph cluster_3 {
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color=red
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10 [label="Enter function <init>" style="filled" fillcolor=red];
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11 [label="Access variable R|<local>/p0|"];
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12 [label="Delegated constructor call: this<R|B|>(...)" style="filled" fillcolor=yellow];
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subgraph cluster_4 {
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color=blue
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13 [label="Enter block"];
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14 [label="Access variable R|<local>/p1|"];
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15 [label="Assignment: R|/B.p3|"];
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16 [label="Exit block"];
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}
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17 [label="Exit function <init>" style="filled" fillcolor=red];
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}
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10 -> {11};
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11 -> {12};
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12 -> {13};
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13 -> {14};
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14 -> {15};
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15 -> {16};
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16 -> {17};
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subgraph cluster_5 {
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color=red
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18 [label="Enter init block" style="filled" fillcolor=red];
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subgraph cluster_6 {
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color=blue
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19 [label="Enter block"];
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20 [label="Access variable R|<local>/p0|"];
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21 [label="Access variable R|kotlin/String.length|"];
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22 [label="Assignment: R|/B.p1|"];
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23 [label="Const: String()"];
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24 [label="Assignment: R|/B.p3|"];
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25 [label="Exit block"];
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}
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26 [label="Exit init block" style="filled" fillcolor=red];
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}
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18 -> {19};
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19 -> {20};
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20 -> {21};
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21 -> {22};
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22 -> {23};
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23 -> {24};
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24 -> {25};
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25 -> {26};
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26 -> {31} [color=green];
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subgraph cluster_7 {
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color=red
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27 [label="Enter class B" style="filled" fillcolor=red];
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28 [label="Part of class initialization"];
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29 [label="Part of class initialization"];
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30 [label="Part of class initialization"];
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31 [label="Exit class B" style="filled" fillcolor=red];
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}
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27 -> {28} [color=green];
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28 -> {29} [style=dotted];
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28 -> {3} [color=green];
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28 -> {3} [style=dashed];
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29 -> {30} [style=dotted];
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29 -> {6} [color=green];
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29 -> {6} [style=dashed];
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30 -> {31} [style=dotted];
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30 -> {18} [color=green];
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30 -> {18} [style=dashed];
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}
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