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.
537 lines
18 KiB
Plaintext
Vendored
537 lines
18 KiB
Plaintext
Vendored
digraph boundSmartcasts_kt {
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graph [nodesep=3]
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node [shape=box penwidth=2]
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}
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color=blue
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39 -> {41 40};
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color=red
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color=blue
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color=blue
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62 [label="Exit when branch condition"];
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}
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subgraph cluster_18 {
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69 [label="Exit block"];
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subgraph cluster_19 {
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88 [label="Exit block"];
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}
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}
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90 -> {91};
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91 -> {92};
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subgraph cluster_22 {
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subgraph cluster_29 {
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color=red
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142 [label="Exit lhs of ?:"];
|
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143 [label="Enter rhs of ?:"];
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144 [label="Jump: ^test_5 Unit"];
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155 -> {156};
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
|
172 -> {173};
|
|
173 -> {174};
|
|
174 -> {175};
|
|
175 -> {176};
|
|
176 -> {177};
|
|
177 -> {178};
|
|
178 -> {179};
|
|
179 -> {180};
|
|
180 -> {181};
|
|
|
|
subgraph cluster_36 {
|
|
color=red
|
|
182 [label="Enter function test_7" style="filled" fillcolor=red];
|
|
subgraph cluster_37 {
|
|
color=blue
|
|
183 [label="Enter block"];
|
|
184 [label="Access variable R|<local>/d1|"];
|
|
185 [label="Enter safe call"];
|
|
186 [label="Access variable R|/D.any|"];
|
|
187 [label="Exit safe call"];
|
|
188 [label="Variable declaration: lval a: R|kotlin/Any?|"];
|
|
189 [label="Access variable R|<local>/d2|"];
|
|
190 [label="Enter safe call"];
|
|
191 [label="Access variable R|/D.any|"];
|
|
192 [label="Exit safe call"];
|
|
193 [label="Variable declaration: lval b: R|kotlin/Any?|"];
|
|
194 [label="Access variable R|<local>/a|"];
|
|
195 [label="Type operator: (R|<local>/a| as R|A|)"];
|
|
196 [label="Access variable R|<local>/a|"];
|
|
197 [label="Smart cast: R|<local>/a|"];
|
|
198 [label="Function call: R|<local>/a|.R|/A.foo|()" style="filled" fillcolor=yellow];
|
|
199 [label="Access variable R|<local>/b|"];
|
|
200 [label="Type operator: (R|<local>/b| as R|B|)"];
|
|
201 [label="Access variable R|<local>/b|"];
|
|
202 [label="Smart cast: R|<local>/b|"];
|
|
203 [label="Function call: R|<local>/b|.R|/B.bar|()" style="filled" fillcolor=yellow];
|
|
204 [label="Exit block"];
|
|
}
|
|
205 [label="Exit function test_7" style="filled" fillcolor=red];
|
|
}
|
|
182 -> {183};
|
|
183 -> {184};
|
|
184 -> {185 187};
|
|
185 -> {186};
|
|
186 -> {187};
|
|
187 -> {188};
|
|
188 -> {189};
|
|
189 -> {190 192};
|
|
190 -> {191};
|
|
191 -> {192};
|
|
192 -> {193};
|
|
193 -> {194};
|
|
194 -> {195};
|
|
195 -> {196};
|
|
196 -> {197};
|
|
197 -> {198};
|
|
198 -> {199};
|
|
199 -> {200};
|
|
200 -> {201};
|
|
201 -> {202};
|
|
202 -> {203};
|
|
203 -> {204};
|
|
204 -> {205};
|
|
|
|
}
|