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130819.1 Keith Walker Language-dependent default array ordering not specified Clarification Withdrawn Keith Walker


Section 5.4, pg 83

In section 5.4 "Array Type Entries" is the statement:

  "If no ordering attribute is present, the default ordering for the source language
   (which is indicated by the DW_AT_language attribute of the enclosing compilation
   unit entry) is assumed."

However the default ordering is then not defined anywhere in the Standard.

Where a similar language-dependent default is used (Section 5.11 "Subrange Type Entries")
the language specific defaults are specified, as well as in the Language encodings table
in Section 7.12 "Source Languages".

DWARF Changes:

Add to section 5.13 "Subrange Type Entries" after the sentence "If no ordering 
attribute is present, the default ordering for the source language (which is 
indicated by the DW_AT_language attribute of the enclosing compilation unit 
entry) is assumed.":

The default array ordering is DW_ORD_row_major for Ada, C, C++, Cobol, D, Go, 
Haskell, Java, Modula-2, Modula-3, Objective C, Objective C++, OpenCL, Pascal, 
PL/1, Python, UPC.  The default array ordering is DW_ORD_col_major for Fortran.


Change the sentence in Section 7.12 from:

"Table 7.14 also shows the default lower bound, if any, assumed for an 
omitted DW_AT_lower_bound attribute in the context of a DW_TAG_subrange_type 
debugging information entry for each defined language"

To:

"Table 7.14 also shows the default lower bound, if any, assumed for an 
omitted DW_AT_lower_bound attribute in the context of a DW_TAG_subrange_type 
debugging information entry and the default array ordering for an omitted 
DW_AT_ordering in the context of a DW_TAG_array_type for each defined language"

Add an additional column called "Default Array Ordering" to Table 7.14: 
"Language encodings" which contains the following values:

DW_LANG_C89               DW_ORD_row_major
DW_LANG_C                 DW_ORD_row_major
DW_LANG_Ada83             DW_ORD_row_major
DW_LANG_C_plus_plus       DW_ORD_row_major
DW_LANG_Cobol74           DW_ORD_row_major
DW_LANG_Cobol85           DW_ORD_row_major
DW_LANG_Fortran77         DW_ORD_col_major
DW_LANG_Fortran90         DW_ORD_col_major
DW_LANG_Pascal83          DW_ORD_row_major
DW_LANG_Modula2           DW_ORD_row_major
DW_LANG_Java              DW_ORD_row_major
DW_LANG_C99               DW_ORD_row_major
DW_LANG_Ada95             DW_ORD_row_major
DW_LANG_Fortran95         DW_ORD_col_major
DW_LANG_PL1               DW_ORD_row_major
DW_LANG_ObjC              DW_ORD_row_major
DW_LANG_ObjC_plus_plus     DW_ORD_row_major
DW_LANG_UPC               DW_ORD_row_major
DW_LANG_D                  DW_ORD_row_major
DW_LANG_Python            DW_ORD_row_major
DW_LANG_OpenCL            DW_ORD_row_major
DW_LANG_Go                 DW_ORD_row_major
DW_LANG_Modula3           DW_ORD_row_major
DW_LANG_Haskell           DW_ORD_row_major

---

Revised 11/19/2013.
Withdrawn 11/20/2013: Defer to language definition.
 


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