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cmd/compile: internal compiler error: panic: interface conversion: ir.Node is *ir.CompLitExpr, not *ir.Name [1.20 backport] #58335

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gopherbot opened this issue Feb 5, 2023 · 2 comments
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CherryPickApproved Used during the release process for point releases compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge
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@gopherbot
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@cuonglm requested issue #58325 to be considered for backport to the next 1.20 minor release.

@gopherbot please consider backport this to 1.20, it's a regression.

@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Feb 5, 2023
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Feb 5, 2023
@gopherbot gopherbot added this to the Go1.20.1 milestone Feb 5, 2023
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Change https://go.dev/cl/466275 mentions this issue: [release-branch.go1.20] cmd/compile: fix inline static init arguments substitued tree

@dr2chase dr2chase added the CherryPickApproved Used during the release process for point releases label Feb 8, 2023
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Feb 8, 2023
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Closed by merging 487be3f to release-branch.go1.20.

gopherbot pushed a commit that referenced this issue Feb 9, 2023
… substitued tree

Blank node must be ignored when building arguments substitued tree.
Otherwise, it could be used to replace other blank node in left hand
side of an assignment, causing an invalid IR node.

Consider the following code:

	type S1 struct {
		s2 S2
	}

	type S2 struct{}

	func (S2) Make() S2 {
		return S2{}
	}

	func (S1) Make() S1 {
		return S1{s2: S2{}.Make()}
	}

	var _ = S1{}.Make()

After staticAssignInlinedCall, the assignment becomes:

	var _ = S1{s2: S2{}.Make()}

and the arg substitued tree is "map[*ir.Name]ir.Node{_: S1{}}". Now,
when doing static assignment, if there is any assignment to blank node,
for example:

	_ := S2{}

That blank node will be replaced with "S1{}":

	S1{} := S2{}

So constructing an invalid IR which causes the ICE.

Fixes #58335

Change-Id: I21b48357f669a7e02a7eb4325246aadc31f78fb9
Reviewed-on: https://go-review.googlesource.com/c/go/+/465098
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/466275
Reviewed-by: Than McIntosh <thanm@google.com>
bradfitz pushed a commit to tailscale/go that referenced this issue Feb 9, 2023
… substitued tree

Blank node must be ignored when building arguments substitued tree.
Otherwise, it could be used to replace other blank node in left hand
side of an assignment, causing an invalid IR node.

Consider the following code:

	type S1 struct {
		s2 S2
	}

	type S2 struct{}

	func (S2) Make() S2 {
		return S2{}
	}

	func (S1) Make() S1 {
		return S1{s2: S2{}.Make()}
	}

	var _ = S1{}.Make()

After staticAssignInlinedCall, the assignment becomes:

	var _ = S1{s2: S2{}.Make()}

and the arg substitued tree is "map[*ir.Name]ir.Node{_: S1{}}". Now,
when doing static assignment, if there is any assignment to blank node,
for example:

	_ := S2{}

That blank node will be replaced with "S1{}":

	S1{} := S2{}

So constructing an invalid IR which causes the ICE.

Fixes golang#58335

Change-Id: I21b48357f669a7e02a7eb4325246aadc31f78fb9
Reviewed-on: https://go-review.googlesource.com/c/go/+/465098
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/466275
Reviewed-by: Than McIntosh <thanm@google.com>
romaindoumenc pushed a commit to TroutSoftware/go that referenced this issue Feb 14, 2023
… substitued tree

Blank node must be ignored when building arguments substitued tree.
Otherwise, it could be used to replace other blank node in left hand
side of an assignment, causing an invalid IR node.

Consider the following code:

	type S1 struct {
		s2 S2
	}

	type S2 struct{}

	func (S2) Make() S2 {
		return S2{}
	}

	func (S1) Make() S1 {
		return S1{s2: S2{}.Make()}
	}

	var _ = S1{}.Make()

After staticAssignInlinedCall, the assignment becomes:

	var _ = S1{s2: S2{}.Make()}

and the arg substitued tree is "map[*ir.Name]ir.Node{_: S1{}}". Now,
when doing static assignment, if there is any assignment to blank node,
for example:

	_ := S2{}

That blank node will be replaced with "S1{}":

	S1{} := S2{}

So constructing an invalid IR which causes the ICE.

Fixes golang#58335

Change-Id: I21b48357f669a7e02a7eb4325246aadc31f78fb9
Reviewed-on: https://go-review.googlesource.com/c/go/+/465098
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/466275
Reviewed-by: Than McIntosh <thanm@google.com>
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