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gccgo: compiles weird construct #11561

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dvyukov opened this issue Jul 3, 2015 · 2 comments
Closed

gccgo: compiles weird construct #11561

dvyukov opened this issue Jul 3, 2015 · 2 comments
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Gccgo

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@dvyukov
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dvyukov commented Jul 3, 2015

gccgo successfully compiles the following program:

package main
import "fmt"

func main() {
    var a = complex()()
    var i interface{} = a
    fmt.Printf("i: %T %#v\n", i, i)
    fmt.Printf("a: %T %#v\n", a, a)
    fmt.Printf("i: %T %#v\n", i, i)
}

The program panics when executed:

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0]

goroutine 16 [running]:
reflect.rawString.pN13_reflect.rtype
    ../../../libgo/go/reflect/type.go:467
reflect.canonicalize
    ../../../libgo/go/reflect/type.go:1943
reflect.toType
    ../../../libgo/go/reflect/type.go:1964
reflect.TypeOf
    ../../../libgo/go/reflect/type.go:1032
fmt.printArg.pN6_fmt.pp
    ../../../libgo/go/fmt/print.go:745
fmt.doPrintf.pN6_fmt.pp
    ../../../libgo/go/fmt/print.go:1183
fmt.Fprintf
    ../../../libgo/go/fmt/print.go:188
fmt.Printf
    ../../../libgo/go/fmt/print.go:197
main.main
    /tmp/111.go:7
created by main
    ../../../libgo/runtime/go-main.c:48

gcc version 6.0.0 2015070 (experimental) (GCC)
@dvyukov
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dvyukov commented Jul 3, 2015

@paranoiacblack

@ianlancetaylor ianlancetaylor added this to the Gccgo milestone Jul 10, 2015
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CL https://golang.org/cl/12778 mentions this issue.

vries pushed a commit to vries/gcc that referenced this issue Aug 1, 2015
compiler: Report errors for malformed builtin calls.
5f1045b 
    
    Errors reported from malformed builtin calls are handled in a later
    pass than the one in which they are detected.  If a malformed builtin
    call is lowered into an error expression too early, these errors will
    never be reported.
    
    Fixes golang/go#11561.
    
    Reviewed-on: https://go-review.googlesource.com/12778


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@226459 138bc75d-0d04-0410-961f-82ee72b054a4
@golang golang locked and limited conversation to collaborators Aug 5, 2016
asiekierka pushed a commit to WonderfulToolchain/gcc-ia16 that referenced this issue May 16, 2022
compiler: Report errors for malformed builtin calls.
1393eb7 
    
    Errors reported from malformed builtin calls are handled in a later
    pass than the one in which they are detected.  If a malformed builtin
    call is lowered into an error expression too early, these errors will
    never be reported.
    
    Fixes golang/go#11561.
    
    Reviewed-on: https://go-review.googlesource.com/12778

From-SVN: r226459
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