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.
221 lines
7.1 KiB
Plaintext
Vendored
221 lines
7.1 KiB
Plaintext
Vendored
digraph when_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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subgraph cluster_1 {
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color=blue
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1 [label="Enter block"];
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subgraph cluster_2 {
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color=blue
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subgraph cluster_3 {
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color=blue
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4 [label="Access variable R|<local>/x|"];
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5 [label="Const: Int(1)"];
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6 [label="Equality operator =="];
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}
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subgraph cluster_4 {
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color=blue
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11 [label="Function call: R|<local>/x|.R|kotlin/Int.rem|(...)" style="filled" fillcolor=yellow];
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}
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subgraph cluster_5 {
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color=blue
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}
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subgraph cluster_6 {
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color=blue
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}
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subgraph cluster_7 {
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color=blue
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}
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subgraph cluster_8 {
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color=blue
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}
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subgraph cluster_9 {
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color=blue
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}
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40 [label="Enter when branch result"];
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subgraph cluster_10 {
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color=blue
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}
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44 [label="Exit when branch result"];
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45 [label="Exit when"];
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}
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}
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}
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0 -> {1};
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1 -> {2};
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2 -> {3};
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3 -> {4};
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7 -> {40 8};
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14 -> {35 15};
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21 -> {29 22};
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34 -> {45} [style=dotted];
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36 -> {37};
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37 -> {38};
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39 -> {45};
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47 -> {48};
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subgraph cluster_11 {
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color=red
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}
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49 -> {50} [color=green];
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subgraph cluster_12 {
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color=red
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51 [label="Enter class B" style="filled" fillcolor=red];
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}
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51 -> {52} [color=green];
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subgraph cluster_13 {
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color=red
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53 [label="Enter function test_2" style="filled" fillcolor=red];
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subgraph cluster_14 {
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color=blue
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subgraph cluster_15 {
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color=blue
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55 [label="Enter when"];
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subgraph cluster_16 {
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color=blue
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56 [label="Enter when branch condition "];
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subgraph cluster_17 {
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color=blue
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57 [label="Enter &&"];
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58 [label="Access variable R|<local>/x|"];
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59 [label="Type operator: (R|<local>/x| is R|A|)"];
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60 [label="Exit left part of &&"];
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61 [label="Enter right part of &&"];
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62 [label="Access variable R|<local>/x|"];
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63 [label="Smart cast: R|<local>/x|"];
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64 [label="Type operator: (R|<local>/x| is R|B|)"];
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65 [label="Exit &&"];
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}
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66 [label="Exit when branch condition"];
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}
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67 [label="Synthetic else branch"];
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68 [label="Enter when branch result"];
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subgraph cluster_18 {
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color=blue
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69 [label="Enter block"];
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70 [label="Access variable R|<local>/x|"];
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72 [label="Type operator: (R|<local>/x| is R|A|)"];
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73 [label="Exit block"];
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}
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74 [label="Exit when branch result"];
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75 [label="Exit when"];
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}
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76 [label="Exit block"];
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}
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77 [label="Exit function test_2" style="filled" fillcolor=red];
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}
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60 -> {65 61};
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75 -> {76};
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76 -> {77};
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}
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