[llvm-dev] recognise DW_AT_SUN_amd64_parmdump dwarf attribute

Robinson, Paul via llvm-dev llvm-dev at lists.llvm.org
Thu Apr 27 10:57:18 PDT 2017

The patch should probably define a new vendor code for SUN rather than re-use GNU.  And it needs a test.

We've been fortunate (or maybe it's a testament to the care exercised by people who define extensions) to see no conflicts in vendor extensions.  If/when it ever comes up we'll have to do something, I think Adrian had a pretty reasonable idea.

From: aprantl at apple.com [mailto:aprantl at apple.com]
Sent: Thursday, April 27, 2017 8:50 AM
To: David Blaikie
Cc: David Gwynne; llvm-dev at lists.llvm.org; Robinson, Paul
Subject: Re: [llvm-dev] recognise DW_AT_SUN_amd64_parmdump dwarf attribute

On Apr 27, 2017, at 8:38 AM, David Blaikie <dblaikie at gmail.com<mailto:dblaikie at gmail.com>> wrote:

This'll need a test case, in any case.

In case you're wondering, one way to do this would be to add an assembler source file, compile it and run it through llvm-dwarfdump.
Alternatively you can use the new yaml2obj tool that is being developed.

-- adrian

Adrian/Paul: Pondering this, any thoughts on how conflicts in the vendor extension range of attributes, forms, etc, should be resolved if they ever come up? (each vendor is free to define them as they wish, so it could be that multiple vendors have different definitions of the same code/number & would be ambiguous) I don't see any reason to block this patch if it doesn't have such a conflict, since there are already other vendor extension codes supported here for a variety of vendors - but does make me wonder.
On Thu, Apr 27, 2017 at 2:50 AM David Gwynne via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
sun created this tag for identifying functions that dumped their
register arguments onto the stack.

this is enough for llvm-dwarfdump to recognise and print the attribute.

hopefully someone will commit it.


Index: include/llvm/Support/Dwarf.def
--- include/llvm/Support/Dwarf.def      (revision 301500)
+++ include/llvm/Support/Dwarf.def      (working copy)
@@ -343,6 +343,8 @@
 HANDLE_DW_AT(0x2134, GNU_pubnames, 0, GNU)
 HANDLE_DW_AT(0x2135, GNU_pubtypes, 0, GNU)
 HANDLE_DW_AT(0x2136, GNU_discriminator, 0, GNU)
+// Sun Extension
+HANDLE_DW_AT(0x2224, SUN_amd64_parmdump, 0, GNU)
 // Borland extensions.
 HANDLE_DW_AT(0x3b11, BORLAND_property_read, 0, BORLAND)
 HANDLE_DW_AT(0x3b12, BORLAND_property_write, 0, BORLAND)
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