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proc: fix embedded field search (#2320)

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Both structMember and findMethod implemented a depth-first search in
embedded fields but the Go specification requires a breadth-first
search. They also allowed promotion of fields in the concrete type of
embedded interfaces even though this is not allowed by Go.
Furthermore they both lacked protection from infinite recursion
when a type embeds itself and the user requests a non-existent field.

Fixes #2316
This commit is contained in:
Alessandro Arzilli
2021-01-29 18:25:31 +01:00
committed by GitHub
parent dceffacb89
commit f19d5e5c13
5 changed files with 162 additions and 102 deletions
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14
service/test/variables_test.go
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@ -504,6 +504,20 @@ func TestEmbeddedStruct(t *testing.T) {
{"b.C.s", true, "\"hello\"", "\"hello\"", "string", nil},
{"b.s", true, "\"hello\"", "\"hello\"", "string", nil},
{"b2", true, "main.B {A: main.A {val: 42}, C: *main.C nil, a: main.A {val: 47}, ptr: *main.A nil}", "main.B {A: (*main.A)(0x…", "main.B", nil},
// Issue 2316: field promotion is breadth first and embedded interfaces never get promoted
{"w2.W1.T.F", true, `"T-inside-W1"`, `"T-inside-W1"`, "string", nil},
{"w2.W1.F", true, `"T-inside-W1"`, `"T-inside-W1"`, "string", nil},
{"w2.T.F", true, `"T-inside-W2"`, `"T-inside-W2"`, "string", nil},
{"w2.F", true, `"T-inside-W2"`, `"T-inside-W2"`, "string", nil},
{"w3.I.T.F", false, `"T-inside-W1"`, `"T-inside-W1"`, "string", nil},
{"w3.I.F", false, `"T-inside-W1"`, `"T-inside-W1"`, "string", nil},
{"w3.T.F", true, `"T-inside-W3"`, `"T-inside-W3"`, "string", nil},
{"w3.F", true, `"T-inside-W3"`, `"T-inside-W3"`, "string", nil},
{"w4.I.T.F", false, `"T-inside-W1"`, `"T-inside-W1"`, "string", nil},
{"w4.I.F", false, `"T-inside-W1"`, `"T-inside-W1"`, "string", nil},
{"w4.F", false, ``, ``, "", errors.New("w4 has no member F")},
{"w5.F", false, ``, ``, "", errors.New("w5 has no member F")},
}
assertNoError(p.Continue(), t, "Continue()")