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[dart2wasm] Classify value types in identical
based on class ID
This avoids reliance on the distinctness of the Wasm types. Change-Id: I23762c674fcf8b2101da30d91f0b6db9ae947d79 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/274681 Reviewed-by: Joshua Litt <joshualitt@google.com>
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@ -1173,25 +1173,39 @@ class Intrinsifier {
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ClassInfo intInfo = translator.classInfo[translator.boxedIntClass]!;
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ClassInfo doubleInfo = translator.classInfo[translator.boxedDoubleClass]!;
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w.Local cid = function.addLocal(w.NumType.i32);
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w.Label refEq = b.block();
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// If the references are identical, return true.
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b.local_get(first);
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b.br_on_null(refEq);
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b.local_get(second);
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b.ref_eq();
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b.if_();
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b.i32_const(1);
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b.return_();
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b.end();
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w.Label fail = b.block();
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// If either is `null`, or their class IDs are different, return false.
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b.local_get(first);
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b.br_on_null(fail);
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b.struct_get(translator.topInfo.struct, FieldIndex.classId);
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b.local_tee(cid);
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b.local_get(second);
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b.br_on_null(fail);
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b.struct_get(translator.topInfo.struct, FieldIndex.classId);
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b.i32_ne();
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b.br_if(fail);
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// Both bool?
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b.local_get(cid);
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b.i32_const(boolInfo.classId);
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b.i32_eq();
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b.if_();
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b.local_get(first);
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b.ref_cast(boolInfo.struct);
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b.struct_get(boolInfo.struct, FieldIndex.boxValue);
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w.Label bothBool = b.block(const [], [boolInfo.nullableType]);
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b.local_get(second);
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b.br_on_cast(bothBool, boolInfo.struct);
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b.i32_const(0);
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b.return_();
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b.end();
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b.ref_cast(boolInfo.struct);
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b.struct_get(boolInfo.struct, FieldIndex.boxValue);
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b.i32_eq();
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b.return_();
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@ -1205,12 +1219,8 @@ class Intrinsifier {
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b.local_get(first);
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b.ref_cast(intInfo.struct);
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b.struct_get(intInfo.struct, FieldIndex.boxValue);
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w.Label bothInt = b.block(const [], [intInfo.nullableType]);
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b.local_get(second);
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b.br_on_cast(bothInt, intInfo.struct);
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b.i32_const(0);
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b.return_();
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b.end();
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b.ref_cast(intInfo.struct);
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b.struct_get(intInfo.struct, FieldIndex.boxValue);
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b.i64_eq();
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b.return_();
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@ -1225,23 +1235,17 @@ class Intrinsifier {
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b.ref_cast(doubleInfo.struct);
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b.struct_get(doubleInfo.struct, FieldIndex.boxValue);
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b.i64_reinterpret_f64();
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w.Label bothDouble = b.block(const [], [doubleInfo.nullableType]);
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b.local_get(second);
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b.br_on_cast(bothDouble, doubleInfo.struct);
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b.i32_const(0);
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b.return_();
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b.end();
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b.ref_cast(doubleInfo.struct);
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b.struct_get(doubleInfo.struct, FieldIndex.boxValue);
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b.i64_reinterpret_f64();
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b.i64_eq();
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b.return_();
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b.end();
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// Compare as references
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b.end();
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b.local_get(first);
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b.local_get(second);
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b.ref_eq();
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// Not identical
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b.end(); // fail
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b.i32_const(0);
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return true;
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}
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