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neild opened this issue Mar 29, 2022 · 6 comments
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cmd/compile: internal compiler error: unhandled OCONV ARRAY -> UINT8 #52020

neild opened this issue Mar 29, 2022 · 6 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.19

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@neild
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neild commented Mar 29, 2022

Compiler failure with tip:

$ go version
go version devel go1.19-a4a0f9b148 Tue Mar 29 18:55:09 2022 +0000 linux/amd64

package main

func main() {
        var _ interface{} = struct{ _ [1]int8 }{}
}

$ go run .
./main.go:4:41: internal compiler error: 'main': unhandled OCONV ARRAY -> UINT8

goroutine 49 [running]:
runtime/debug.Stack()
        /usr/local/google/home/dneil/src/go/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0xc7ca60?, 0x0?}, {0xc00042b8d0, 0x1e}, {0xc0007142d0, 0x3, 0x3})
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/base/print.go:227 +0x1d7
cmd/compile/internal/base.Fatalf(...)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/ssagen.(*ssafn).Fatalf(0x0?, {0x0?, 0x0?}, {0xd0b605, 0x18}, {0xc00070c140, 0x2, 0x0?})
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:7676 +0x17d
cmd/compile/internal/ssagen.(*state).Fatalf(...)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:925
cmd/compile/internal/ssagen.(*state).conv(0xc0005c4100, {0xe63290, 0xc0007101e0}, 0x1?, 0xc0003e8bd0, 0xc00037e230)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2526 +0x1f49
cmd/compile/internal/ssagen.(*state).exprCheckPtr(0xc0005c4100, {0xe63290?, 0xc0007101e0?}, 0x1)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2724 +0x1cda
cmd/compile/internal/ssagen.(*state).expr(...)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2532
cmd/compile/internal/ssagen.(*state).exprCheckPtr(0xc0005c4100, {0xe63290?, 0xc000710230?}, 0x1)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2723 +0x1c8b
cmd/compile/internal/ssagen.(*state).expr(...)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2532
cmd/compile/internal/ssagen.(*state).exprCheckPtr(0xc0005c4100, {0xe62c18?, 0xc000726060?}, 0x1)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2892 +0x49eb
cmd/compile/internal/ssagen.(*state).expr(0xc0005c4100?, {0xe62c18?, 0xc000726060?})
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2532 +0x28
cmd/compile/internal/ssagen.(*state).addr(0xc0005c4100, {0xe639c0, 0xc0007260c0})
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:5233 +0xbdf
cmd/compile/internal/ssagen.(*state).exprCheckPtr(0xc0005c4100, {0xe62880?, 0xc000710320?}, 0x1)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2978 +0x154a
cmd/compile/internal/ssagen.(*state).expr(...)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2532
cmd/compile/internal/ssagen.(*state).exprCheckPtr(0xc0005c4100, {0xe62c18?, 0xc000726180?}, 0x1)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:3114 +0x693e
cmd/compile/internal/ssagen.(*state).expr(...)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:2532
cmd/compile/internal/ssagen.(*state).stmt(0xc0005c4100, {0xe62aa8, 0xc0003e6dc0?})
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:1581 +0xade
cmd/compile/internal/ssagen.(*state).stmtList(...)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:1371
cmd/compile/internal/ssagen.buildssa(0xc000405cc0, 0x0)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/ssa.go:554 +0x1ea9
cmd/compile/internal/ssagen.Compile(0xc000405cc0, 0xc0005bc790?)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/ssagen/pgen.go:183 +0x4c
cmd/compile/internal/gc.compileFunctions.func4.1(0x0?)
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/gc/compile.go:153 +0x3a
cmd/compile/internal/gc.compileFunctions.func3.1()
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/gc/compile.go:140 +0x4d
created by cmd/compile/internal/gc.compileFunctions.func3
        /usr/local/google/home/dneil/src/go/src/cmd/compile/internal/gc/compile.go:138 +0x78
@prattmic
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My bisect blames:

3fd8b8627f39d34e1a66bf4d610784bcd3f4319d is the first bad commit
commit 3fd8b8627f39d34e1a66bf4d610784bcd3f4319d
Author: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Date:   Wed Dec 1 00:28:25 2021 +0700

    cmd/compile: handle sole component for 1-byte type interface conversion
    
    For 1-byte type, we have a special case for converting to interface
    type. But we missed an optimization for sole component-ed types, this CL
    add that one.
    
    goos: linux
    goarch: amd64
    cpu: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
    Benchmark_BoolField-8           1000000000               0.6473 ns/op
    Benchmark_ByteField-8           1000000000               0.6094 ns/op
    Benchmark_Uint8Field-8          1000000000               0.6385 ns/op
    Benchmark_Int16Field-8          785179434                1.481 ns/op
    Benchmark_Int32Field-8          796127782                1.539 ns/op
    Benchmark_Int64Field-8          718815478                1.657 ns/op
    
    Fixes #49879
    
    Change-Id: Idc0e9d3ff738c8c8081b8e8d65093dacf2bcf392
    Reviewed-on: https://go-review.googlesource.com/c/go/+/367755
    Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
    Reviewed-by: Keith Randall <khr@golang.org>
    Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
    TryBot-Result: Gopher Robot <gobot@golang.org>

 src/cmd/compile/internal/types/type.go   |  1 +
 src/cmd/compile/internal/walk/convert.go | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 1 deletion(-)
bisect found first bad commit

https://go.dev/cl/367755

cc @cuonglm @randall77

@gopherbot
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Change https://go.dev/cl/396535 mentions this issue: Revert "cmd/compile: handle sole component for 1-byte type interface conversion"

@prattmic
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I'm not familiar enough with this code to fix this, but the CL appears standalone, so I went ahead and sent a revert as https://go.dev/cl/396535 if we want to revert this while it gets fixed.

@odeke-em
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@prattmic I've unblocked you and approved your CL, please go ahead and submit.

@cuonglm
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cuonglm commented Mar 30, 2022

@prattmic I will send a fix shortly.

@cuonglm cuonglm added the NeedsFix The path to resolution is known, but the work has not been done. label Mar 30, 2022
@cuonglm cuonglm self-assigned this Mar 30, 2022
@gopherbot
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Change https://go.dev/cl/396614 mentions this issue: cmd/compile/internal/walk: fix wrong soleComponent implementation

@cuonglm cuonglm added this to the Go1.19 milestone Mar 30, 2022
@rsc rsc unassigned cuonglm Jun 22, 2022
@golang golang locked and limited conversation to collaborators Jun 22, 2023
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