c6347389d2
This moves pattern variable assignments of fully matched expressions into the case body. This will help backends (dart2js in particular) to reason about the code flow. Closes #54115 Change-Id: I598a384a829f16e91ab2d6a309499cf20b9cc121 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/339122 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jens Johansen <jensj@google.com>
111 lines
3.7 KiB
Plaintext
111 lines
3.7 KiB
Plaintext
library;
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import self as self;
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import "dart:core" as core;
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static method test1(dynamic x) → dynamic {
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#L1:
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{
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final synthesized dynamic #0#0 = x;
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{
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hoisted core::int x;
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if(#0#0 is core::int && (let final dynamic #t1 = x = #0#0{core::int} in true)) {
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{
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{
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core::String x = "foo";
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return x;
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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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return "bar";
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}
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}
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}
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}
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}
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static method test2(dynamic x) → dynamic {
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#L2:
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{
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final synthesized dynamic #0#0 = x;
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synthesized core::bool #0#4;
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synthesized core::bool #0#4#isSet = false;
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synthesized dynamic #0#6;
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synthesized core::bool #0#6#isSet = false;
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synthesized dynamic #0#7;
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synthesized core::bool #0#7#isSet = false;
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{
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lowered hoisted core::int x#case#0;
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lowered hoisted core::int x#case#1;
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if(#0#0 is core::List<dynamic> && (#0#4#isSet ?{core::bool} #0#4{core::bool} : let final dynamic #t2 = #0#4#isSet = true in #0#4 = #0#0{core::List<dynamic>}.{core::List::length}{core::int} =={core::num::==}{(core::Object) → core::bool} #C1) && ((#0#6#isSet ?{dynamic} #0#6{dynamic} : let final dynamic #t3 = #0#6#isSet = true in #0#6 = #0#0{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic}) is core::int && (let final dynamic #t4 = x#case#0 = (#0#6#isSet ?{dynamic} #0#6{dynamic} : let final dynamic #t5 = #0#6#isSet = true in #0#6 = #0#0{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic}) as{Unchecked} core::int in true)) || #0#0 is core::List<dynamic> && (#0#4#isSet ?{core::bool} #0#4{core::bool} : let final dynamic #t6 = #0#4#isSet = true in #0#4 = #0#0{core::List<dynamic>}.{core::List::length}{core::int} =={core::num::==}{(core::Object) → core::bool} #C1) && ((#0#7#isSet ?{dynamic} #0#7{dynamic} : let final dynamic #t7 = #0#7#isSet = true in #0#7 = #0#0{core::List<dynamic>}.{core::List::[]}(1){(core::int) → dynamic}) is core::int && (let final dynamic #t8 = x#case#1 = (#0#7#isSet ?{dynamic} #0#7{dynamic} : let final dynamic #t9 = #0#7#isSet = true in #0#7 = #0#0{core::List<dynamic>}.{core::List::[]}(1){(core::int) → dynamic}) as{Unchecked} core::int in true))) {
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{
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core::String x = "foo";
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return x;
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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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return "bar";
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}
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}
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}
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}
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}
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static method test3(dynamic x) → dynamic {
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{
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hoisted core::int x;
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final synthesized dynamic #0#0 = x;
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if(#0#0 is core::int) {
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x = #0#0{core::int};
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{
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core::String x = "foo";
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return x;
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}
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}
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else {
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return "bar";
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}
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}
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}
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static method test4(dynamic x) → dynamic {
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core::Function f = () → core::int => 0;
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{
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hoisted core::int x;
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final synthesized dynamic #0#0 = x;
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if(#0#0 is core::int) {
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x = #0#0{core::int};
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{
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core::String x = (() → core::String {
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f = () → core::int => 1;
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return "foo";
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})(){() → core::String};
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}
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}
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}
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return f();
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}
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static method main() → dynamic {
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self::expectEquals(self::test1(0), "foo");
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self::expectEquals(self::test1("foo"), "bar");
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self::expectEquals(self::test2(<core::Object>[0, false]), "foo");
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self::expectEquals(self::test2(<core::Object>[false, 0]), "foo");
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self::expectEquals(self::test2("foo"), "bar");
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self::expectEquals(self::test3(0), "foo");
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self::expectEquals(self::test3("foo"), "bar");
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self::expectEquals(self::test4(0), 1);
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self::expectEquals(self::test4("foo"), 0);
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}
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static method expectEquals(dynamic x, dynamic y) → dynamic {
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if(!(x =={core::Object::==}{(core::Object) → core::bool} y)) {
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throw "Expected '${x}' to be equal to '${y}'.";
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}
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}
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constants {
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#C1 = 2
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}
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