HP DDL D40, Справочное руководство

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DDL Compiler Commands
Data Definition Language (DDL) Reference Manual — 426798-002
9- 56
EXPANDC Command
EXPANDC Command
The EXPANDC command enables inline expansion of C language output
.
EXPANDC
directs the DDL compiler to output a referenced type definition inline instead of as
a structure name.
NOEXPANDC
directs the DDL compiler to output a referenced type definition as a structure
name.
EXPANDC Command Guidelines
The following points are guidelines for using the EXPANDC command:
•
A referenced definition type is a type of a line item and is a definition defined prior
to the line item that references it.
•
In C applications, a structure being referenced by a line item is not always in the
same module. Further, the structure being referenced could refer to yet another
structure that might be in another module. Without inline expansion, a dependency
chain or modules must be developed to ensure proper resolution of references.
•
The EXPANDC command does not apply to type ENUM, because the C compiler
requires each enumerator to be unique. For ENUM types, DDL outputs a
referenced type definition as a structure name. DDL generates a C enumerator for
each 89-level clause in a type ENUM definition.
EXPANDC Command Examples
The following examples show C output for DDL definitions using the EXPANDC and
NOEXPANDC commands.
{ EXPANDC | NOEXPANDC }
DDL Definition C Output With ?NOEXPANDC C Output With ?EXPANDC
def a pic x (10).
t
ypedef char a_def[10];
#pragma fieldalign shared2 __b
same as ?NOEXPANDC
def b.
2 b1 type binary.
2 b2 pic x(10).
2 b3 occurs 5 times.
3 b31 type binary.
3 b32 pic x(10).
end
typedef struct __b
{
short b1;
char b2[10];
struct
{
short b31;
char b32[10];
} b3[5];
} b_def;
same as ?NOEXPANDC