[Issue 3522] ICE(cg87.c): variable*array[].

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=3522

Walter Bright bugzi...@digitalmars.com changed:

   What|Removed |Added

Version|1.051   |D1

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[Issue 3522] ICE(cg87.c): variable*array[].

[d-bugmail]

http://d.puremagic.com/issues/show_bug.cgi?id=3522


Don clugd...@yahoo.com.au changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution||FIXED


--- Comment #4 from Don clugd...@yahoo.com.au 2010-05-05 19:07:20 PDT ---
Fixed DMD2.044

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[Issue 3522] ICE(cg87.c): variable*array[].

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http://d.puremagic.com/issues/show_bug.cgi?id=3522


bearophile_h...@eml.cc changed:

   What|Removed |Added

 CC||bearophile_h...@eml.cc


--- Comment #2 from bearophile_h...@eml.cc 2010-04-29 02:28:23 PDT ---
 The error message is confusing (this is bug 3817), for all of them should be
 something like:
 Should be Array operation %s not implemented (requires memory allocation)

I don't understand.

In a program like:

void main() {
int[] a1 = [1];
int[] a2 = [2];
int[] a3;
a3 = a1 + a2;
}

I think the compiler has to write an error message like:
test.d(5): Error: Array operator + not supported (have you forgotten the []?)

So this is more correct code:

void main() {
int[] a1 = [1];
int[] a2 = [2];
int[] a3;
a3[] = a1[] + a2[];
}

But array ops don't allocate memory, so the a3 array can't be filled. This
prints nothing:

import std.stdio: writeln;
void main() {
int[] a1 = [1];
int[] a2 = [2];
int[] a3;
a3[] = a1[] + a2[];
writeln(a3);
}

This other error can be found at runtime...

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[Issue 3522] ICE(cg87.c): variable*array[].

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--- Comment #1 from Don clugd...@yahoo.com.au 2010-04-28 20:55:10 PDT ---
This patch also fixes:
bug 2549 Segfault on array multiplication.
bug 3066 Array operation without a slice as the lvalue accepted, bad codegen
bug 3817 Array op: wrong error message

The root cause is that array operations which require memory allocations are
not handled in the front-end. At entry to the backend, no array ops should
still exist inside expressions. Currently, only arr[]+arr[] and arr[]-arr[]
generate error messages; all other cases get passed through to the backend,
resulting in bad code generation or an ICE.
The error messages just need to be expanded to cover the other cases.
(Note that when the front-end supports these types of operations, this test is
still useful -- it acts as an assert for the backend).

PATCH:
e2ir.c, around line 2098. AddExp, MinExp catch errors, but the other array ops
don't.
They all need to catch var*arr, arr*var as well as arr*arr.

(The var+arr check is required for the example in the comments in 3066).

The error message is confusing (this is bug 3817), for all of them should be
something like:
Should be Array operation %s not implemented (requires memory allocation)

NegExp needs to be treated, as well. For each of AddExp, MinExp, MulExp,
DivExp,
the code should be of this form (with only the OPmul line changing).

elem *MulExp::toElem(IRState *irs)
{   elem *e;
Type *tb1 = e1-type-toBasetype();
Type *tb2 = e2-type-toBasetype();

if ((tb1-ty == Tarray || tb1-ty == Tsarray) ||
(tb2-ty == Tarray || tb2-ty == Tsarray)
   )
{
error(Array operation %s not implemented (requires memory
allocation), toChars());
e = el_long(type-totym(), 0);  // error recovery
}
else
e = toElemBin(irs, OPmul);
return e;
}

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