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go/types: improve recursive type error message

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This change improves error message for recursive types.
Currently, compilation of the [following program](https://go.dev/play/p/3ef84ObpzfG):

package main

type T1[T T2] struct{}
type T2[T T1] struct{}

returns an error:

./prog.go:3:6: invalid recursive type T1
	./prog.go:3:6: T1 refers to
	./prog.go:4:6: T2 refers to
	./prog.go:3:6: T1

With the patch applied the error message looks like:

./prog.go:3:6: invalid recursive type T1
	./prog.go:3:6: T1 refers to T2
	./prog.go:4:6: T2 refers to T1

Change-Id: Ic07cdffcffb1483c672b241fede4e694269b5b79
GitHub-Last-Rev: cd042fdc38
GitHub-Pull-Request: golang/go#69574
Reviewed-on: https://go-review.googlesource.com/c/go/+/614084
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Tim King <taking@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Max Neverov 2024-10-09 00:00:28 +00:00 committed by Robert Griesemer
parent d40ae5efc8
commit bdc6dbbc64
8 changed files with 31 additions and 40 deletions
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17
src/cmd/compile/internal/types2/decl.go
View File

@ -334,17 +334,14 @@ func (check *Checker) cycleError(cycle []Object, start int) {
} else {
err.addf(obj, "invalid cycle in declaration of %s", objName)
}
i := start
for range cycle {
err.addf(obj, "%s refers to", objName)
i++
if i >= len(cycle) {
i = 0
}
obj = cycle[i]
objName = name(obj)
// "cycle[i] refers to cycle[j]" for (i,j) = (s, s+1), (s+1, s+2), ..., (n, 0), (0,1), ..., (s-1,s) for len(cycle) = n, s = start.
n := len(cycle)
rotate := func(i int) int { return (i + start) % n }
for i := range n {
obj := cycle[rotate(i)]
next := cycle[rotate(i+1)]
err.addf(obj, "%s refers to %s", name(obj), name(next))
}
err.addf(obj, "%s", objName)
err.report()
}

10
src/cmd/compile/internal/types2/initorder.go
View File

@ -163,13 +163,11 @@ func (check *Checker) reportCycle(cycle []Object) {
err := check.newError(InvalidInitCycle)
err.addf(obj, "initialization cycle for %s", obj.Name())
// subtle loop: print cycle[i] for i = 0, n-1, n-2, ... 1 for len(cycle) = n
for i := len(cycle) - 1; i >= 0; i-- {
err.addf(obj, "%s refers to", obj.Name())
obj = cycle[i]
// "cycle[i] refers to cycle[j]" for (i,j) = (0, n-1), (n-1, n-2), ..., (1,0) for len(cycle) = n.
for j := len(cycle) - 1; j >= 0; j-- {
err.addf(obj, "%s refers to %s", obj.Name(), cycle[j].Name())
obj = cycle[j]
}
// print cycle[0] again to close the cycle
err.addf(obj, "%s", obj.Name())
err.report()
}

18
src/go/types/decl.go
View File

@ -335,17 +335,15 @@ func (check *Checker) cycleError(cycle []Object, start int) {
} else {
err.addf(obj, "invalid cycle in declaration of %s", objName)
}
i := start
for range cycle {
err.addf(obj, "%s refers to", objName)
i++
if i >= len(cycle) {
i = 0
}
obj = cycle[i]
objName = name(obj)
// "cycle[i] refers to cycle[j]" for (i,j) = (s, s+1), (s+1, s+2), ..., (n, 0), (0,1), ..., (s-1,s) for len(cycle) = n, s = start.
n := len(cycle)
rotate := func(i int) int { return (i + start) % n }
for i := range n {
obj := cycle[rotate(i)]
next := cycle[rotate(i+1)]
err.addf(obj, "%s refers to %s", name(obj), name(next))
}
err.addf(obj, "%s", objName)
err.report()
}

10
src/go/types/initorder.go
View File

@ -166,13 +166,11 @@ func (check *Checker) reportCycle(cycle []Object) {
err := check.newError(InvalidInitCycle)
err.addf(obj, "initialization cycle for %s", obj.Name())
// subtle loop: print cycle[i] for i = 0, n-1, n-2, ... 1 for len(cycle) = n
for i := len(cycle) - 1; i >= 0; i-- {
err.addf(obj, "%s refers to", obj.Name())
obj = cycle[i]
// "cycle[i] refers to cycle[j]" for (i,j) = (0, n-1), (n-1, n-2), ..., (1,0) for len(cycle) = n.
for j := len(cycle) - 1; j >= 0; j-- {
err.addf(obj, "%s refers to %s", obj.Name(), cycle[j].Name())
obj = cycle[j]
}
// print cycle[0] again to close the cycle
err.addf(obj, "%s", obj.Name())
err.report()
}

2
test/fixedbugs/bug195.go
View File

@ -18,7 +18,7 @@ type I4 interface { // GC_ERROR "invalid recursive type: I4 refers to itself"
I4 // GCCGO_ERROR "interface"
}
type I5 interface { // GC_ERROR "invalid recursive type I5\n\tLINE:.* I5 refers to\n\tLINE+4:.* I6 refers to\n\tLINE:.* I5$"
type I5 interface { // GC_ERROR "invalid recursive type I5\n\tLINE:.* I5 refers to I6\n\tLINE+4:.* I6 refers to I5$"
I6
}

10
test/fixedbugs/issue41575.go
View File

@ -6,7 +6,7 @@
package p
type T1 struct { // ERROR "invalid recursive type T1\n\tLINE: T1 refers to\n\tLINE+4: T2 refers to\n\tLINE: T1$|invalid recursive type"
type T1 struct { // ERROR "invalid recursive type T1\n.*T1 refers to T2\n.*T2 refers to T1|invalid recursive type"
f2 T2
}
@ -15,21 +15,21 @@ type T2 struct { // GCCGO_ERROR "invalid recursive type"
}
type a b // GCCGO_ERROR "invalid recursive type"
type b c // ERROR "invalid recursive type b\n\tLINE: b refers to\n\tLINE+1: c refers to\n\tLINE: b$|invalid recursive type"
type b c // ERROR "invalid recursive type b\n.*b refers to c\n.*c refers to b|invalid recursive type|invalid recursive type"
type c b // GCCGO_ERROR "invalid recursive type"
type d e
type e f
type f f // ERROR "invalid recursive type f\n\tLINE: f refers to\n\tLINE: f$|invalid recursive type"
type f f // ERROR "invalid recursive type: f refers to itself|invalid recursive type|invalid recursive type"
type g struct { // ERROR "invalid recursive type g\n\tLINE: g refers to\n\tLINE: g$|invalid recursive type"
type g struct { // ERROR "invalid recursive type: g refers to itself|invalid recursive type"
h struct {
g
}
}
type w x
type x y // ERROR "invalid recursive type x\n\tLINE: x refers to\n\tLINE+1: y refers to\n\tLINE+2: z refers to\n\tLINE: x$|invalid recursive type"
type x y // ERROR "invalid recursive type x\n.*x refers to y\n.*y refers to z\n.*z refers to x|invalid recursive type"
type y struct{ z } // GCCGO_ERROR "invalid recursive type"
type z [10]x

2
test/fixedbugs/issue50788.dir/b.go
View File

@ -6,4 +6,4 @@ package b
import "./a"
type T a.T[T] // ERROR "invalid recursive type T\n.*T refers to\n.*a\.T refers to\n.*T"
type T a.T[T] // ERROR "invalid recursive type T\n.*T refers to a\.T\n.*a\.T refers to T"

2
test/initloop.go
View File

@ -11,7 +11,7 @@ package main
var (
x int = a
a int = b // ERROR "a refers to\n.*b refers to\n.*c refers to\n.*a|initialization loop"
a int = b // ERROR "a refers to b\n.*b refers to c\n.*c refers to a|initialization loop"
b int = c
c int = a
)