http://d.puremagic.com/issues/show_bug.cgi?id=9982

           Summary: ICE on CTFE for pointer dereference
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: CTFE, ice
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: monarchdodra@gmail.com


--- Comment #0 from monarchdodra@gmail.com 2013-04-23 03:23:13 PDT ---
Assertion failure: 'dest->op == TOKstructliteral || dest->op == TOKarrayliteral || dest->op == TOKstring' on line 1604 in file 'ctfeexpr.c'

and

Error: cannot dereference invalid pointer *chunk

//----------------
static struct S
{
}
struct SS
{
    S s2; //[1]
    this(S s1)
    {
        //S s2; //[2]
        emplace(&s2, s1);
    }
}

void emplace(S* chunk, S arg)
{
    emplacePostblitter(*chunk, arg); //[3]
    *chunk = arg; //[4]
}
private void emplacePostblitter(ref S chunk, S arg)
{
    chunk = arg;
}

enum s = S();
enum p = SS(s);
//----------------

Getting two different errors:
[3] : //Assertion failure: 'dest->op == TOKstructliteral || dest->op ==
TOKarrayliteral || dest->op == TOKstring' on line 1604 in file 'ctfeexpr.c'

If we comment [3], then it is [4] that errors:
[4] Error: cannot dereference invalid pointer *chunk

Interesting enough, if we move line [1] to line [2], then everything works fine.

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Igor Stepanov <wazar.leollone@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wazar.leollone@yahoo.com


--- Comment #1 from Igor Stepanov <wazar.leollone@yahoo.com> 2013-04-23 07:03:08 PDT ---
I've tried to simplify this bug case.
My resolution: error in operation of taking address of struct member and
dereference it.
We must ask Don about this.

struct Foo(T)
{
    T a;

    this(T arg)
    {
      T* p = &a;
      *p = arg;
    }

    this(T arg, int)
    {
      T* p = &a;
      setRef(*p, arg);
    }

    static void setRef(ref T p, T v)
    {
        p = v;
    }
}

auto ct1 = Foo!int(99); //compiled, but doesn't set this.a to 99
auto ct2 = Foo!int(99, 0); //compiled, but doesn't set this.a to 99

//try with struct

struct Bar
{
    int b;
}

auto ct1_2 = Foo!Bar(Bar(99)); //Error
auto ct2_2 = Foo!Bar(Bar(99), 0); //ICE


void main()
{
    assert(ct1.a != 99);
    assert(ct2.a != 99);
}

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|D2                          |D1 & D2
           Severity|normal                      |critical


--- Comment #2 from Don <clugdbug@yahoo.com.au> 2013-07-09 02:00:27 PDT ---
This is a critical bug. Assignment via a pointer to a struct member does not work!

struct Bug9982 {
    int a;
}

int test9982()
{
    Bug9982 x;
    int *q = &x.a;
    *q = 99;
    assert(x.a == 99);
    return 1;
}

static assert(test9982());

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--- Comment #3 from github-bugzilla@puremagic.com 2013-08-26 23:56:25 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/72b160b53662feeb927175260f9e1b165b86009a Issue 9982 case(b) wrong code for dotvar pointer assign

The existing code was complicated and just plain wrong.

https://github.com/D-Programming-Language/dmd/commit/16c3d57ee460f368337bbd3f2dea39a1ff6e1903 Fix issue 9982 ICE on CTFE for pointer dereference

CTFE assignments can resolve to a StructLiteral inplace assign.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com
            Version|D1 & D2                     |D1


--- Comment #4 from Walter Bright <bugzilla@digitalmars.com> 2013-08-26 23:56:53 PDT ---
Fixed for D2.

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--- Comment #5 from github-bugzilla@puremagic.com 2013-09-13 10:45:53 PDT ---
Commit pushed to dmd-1.x at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/0e7de354e055464634565f22bc764c9695b0475a Issue 9982 case(b) wrong code for dotvar pointer assign

The existing code was complicated and just plain wrong.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
            Version|D1                          |D1 & D2
         Resolution|                            |FIXED


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