Unable to access fields of a record type in some cases

[Swati Rathi]

Hello,

We want to fetch fields of a record type from the formal arguments of a 
function.
For a RECORD_TYPE, we fetch the fields using TYPE_FIELDS.

In the program 471.omnetpp (from the SPEC CPU2006 benchmark suite), we 
encountered a case where we were not able to access the fields. Below is 
the dump of the same record type showing different output in different 
functions. We are not able to access fields of the record type for the 
first case.

Can you tell us the reason for different type nodes?
Also can you suggest an approach to solve our problem.

-------------------------------------------------------------------------------------------
Pointer declared as "struct cMessage *" is a parameter in one function. 
Below is the dump of node "struct cMessage *".

<pointer_type 0x2b8fad7baa80
     type <record_type 0x2b8fad7bab28 cMessage VOID
         align 8 symtab 0 alias set -1 canonical type 0x2b8faa800690 
context <translation_unit_decl 0x2b8fad76e958 D.82130>
         pointer_to_this <pointer_type 0x2b8fad7baa80> chain <type_decl 
0x2b8fad7b3730 cMessage>>
     unsigned DI
     size <integer_cst 0x2b8faa6c1ec0 type <integer_type 0x2b8faa6d20a8 
bitsizetype> constant 64>
     unit size <integer_cst 0x2b8faa6c1ee0 type <integer_type 
0x2b8faa6d2000 sizetype> constant 8>
     align 64 symtab 0 alias set -1 canonical type 0x2b8faa800e70
     pointer_to_this <pointer_type 0x2b8fad7d9000>>


Another pointer also declared as "struct cMessage *" is a parameter in 
second function. Below is the dump of node "struct cMessage *".

<pointer_type 0x2b8faa834150
     type <record_type 0x2b8faa82e1f8 cMessage addressable 
needs-constructing BLK
         size <integer_cst 0x2b8faa8186c0 constant 1408>
         unit size <integer_cst 0x2b8faa818720 constant 176>
         align 64 symtab 0 alias set -1 canonical type 0x2b8faa834c78
         fields <field_decl 0x2b8faa826850 D.2814 type <record_type 
0x2b8faa819150 cObject>
             ignored BLK file omnet_include/cmessage.h line 84 col 15
             size <integer_cst 0x2b8faa6d4620 constant 448>
             unit size <integer_cst 0x2b8faa7f0620 constant 56>
             align 64 offset_align 128
             offset <integer_cst 0x2b8faa6c1f00 constant 0>
             bit offset <integer_cst 0x2b8faa6c1f60 constant 0> context 
<record_type 0x2b8faa82e1f8 cMessage> chain <field_decl 0x2b8faa8268e8 
swati_test>> context <translation_unit_decl 0x2b8faa6dcf18 D.2350>
         pointer_to_this <pointer_type 0x2b8faa82e2a0> reference_to_this 
<reference_type 0x2b8fab219c78> chain <type_decl 0x2b8faa82b678 
cMessage>>
     public unsigned DI
     size <integer_cst 0x2b8faa6c1ec0 type <integer_type 0x2b8faa6d20a8 
bitsizetype> constant 64>
     unit size <integer_cst 0x2b8faa6c1ee0 type <integer_type 
0x2b8faa6d2000 sizetype> constant 8>
     align 64 symtab 0 alias set -1 canonical type 0x2b8faa800e70
     pointer_to_this <pointer_type 0x2b8faa8a3d20>>

-------------------------------------------------------------------------------------------

Thank you.

Regards,
Swati