I have a look later today...
Glad to hear you are feeling better!
snaroff
On Dec 15, 2007, at 9:38 AM, Chris Lattner wrote:
On Dec 14, 2007, at 11:57 PM, Oliver Hunt wrote:
So i'm looking at this failure:
typedef struct { char name[100]; } entry;
char f1(entry *e) { return *e->name; }
The problem appears to be CodeGenFunction::EmitScalarExpr being
called on e->name as it believes
e->name is an array type rather than a scalar, so we assert.
I'm not sure what the appropriate correction should be -- should i
fix
CodeGenFunction::EmitLoadOfLValue
So that it can handle an array type -- emitting an array type as an
lvalue should just be to emit a getElementPtr(array, 0)
Or alternatively have a step during merge to convert *array to
array[0]
Hi Oliver,
Sorry for the delay, I've been majorly sick since thursday night. I
don't think this is a codegen bug, I think it's a sema bug:
$ clang t3.c -ast-dump
typedef char *__builtin_va_list;
typedef struct <anonymous> entry;
char f1(entry *e)
(CompoundStmt 0x8061e0 <t3.c:2:19, col:38>
(ReturnStmt 0x8061d0 <col:21, col:32>
(UnaryOperator 0x8061b0 <col:28, col:32> 'char' prefix '*'
(MemberExpr 0x806180 <col:29, col:32> 'char [100]' ->name
0x805f00
(DeclRefExpr 0x806160 <col:29> 'entry *' ParmVar='e'
0x806120)))))
Sema is properly inferring that the * has type char, but it isn't
inserting an implicit cast. I'd expect to see something like this:
clang t3.c -ast-dump
typedef char *__builtin_va_list;
typedef struct <anonymous> entry;
char f1(entry *e)
(CompoundStmt 0x8061e0 <t3.c:2:19, col:38>
(ReturnStmt 0x8061d0 <col:21, col:32>
(UnaryOperator 0x8061b0 <col:28, col:32> 'char' prefix '*'
(ImplicitCast char*
(MemberExpr 0x806180 <col:29, col:32> 'char [100]' ->name
0x805f00
(DeclRefExpr 0x806160 <col:29> 'entry *' ParmVar='e'
0x806120))))))
Maybe Steve can take a look if he has a chance,
-Chris
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