From 5d27afaf31ac124edfef09862d26247b2c12b6a1 Mon Sep 17 00:00:00 2001

From: Arnaldo Carvalho de Melo <acme@redhat.com>

Date: Tue, 4 Oct 2022 18:09:33 -0300

Subject: [PATCH 1/7] pahole: Support '--lang/--lang_exclude=asm'

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It is disjoint from the other languages and then the first simple

implementation of language inclusion/exclusion didn't support it, add

an special case to test against 0x8001 (DW_LANG_Mips_Assembler) to cover

that.

This is needed as recently compilers started to add DWARF constructs to

represent asm CUs that broke pahole as it didn't support

DW_TAG_unspecified_type as a "type", so add it in case in the future we

want to exclude such CUs.

The DW_TAG_unspecified_type tag is going to be supported in the next

csets tho.

We also may want this to exclude new tags that aren't supported in BTF,

etc.

Cc: Martin Liška <mliska@suse.cz>

Cc: Nick Clifton <nickc@redhat.com>

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

---

 dwarves.c          | 3 +++

 man-pages/pahole.1 | 2 +-

 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/dwarves.c b/dwarves.c

index db1dcf5904bc98fe..32bfec5ea0f1a338 100644

--- a/dwarves.c

+++ b/dwarves.c

@@ -2127,6 +2127,9 @@ int lang__str2int(const char *lang)

 	[DW_LANG_UPC]		 = "upc",

 	};

+	if (strcasecmp(lang, "asm") == 0)

+		return DW_LANG_Mips_Assembler;

+

 	// c89 is the first, bliss is the last, see /usr/include/dwarf.h

 	for (int id = DW_LANG_C89; id <= DW_LANG_BLISS; ++id)

 		if (languages[id] && strcasecmp(lang, languages[id]) == 0)

diff --git a/man-pages/pahole.1 b/man-pages/pahole.1

index bb88e2f5f55a2ee9..f60713a7118d9b63 100644

--- a/man-pages/pahole.1

+++ b/man-pages/pahole.1

@@ -378,7 +378,7 @@ Only process compilation units built from source code written in the specified l

 Supported languages:

-  ada83, ada95, bliss, c, c89, c99, c11, c++, c++03, c++11, c++14, cobol74,

+  ada83, ada95, asm, bliss, c, c89, c99, c11, c++, c++03, c++11, c++14, cobol74,

   cobol85, d, dylan, fortran77, fortran90, fortran95, fortran03, fortran08,

   go, haskell, java, julia, modula2, modula3, objc, objc++, ocaml, opencl,

   pascal83, pli, python, renderscript, rust, swift, upc

-- 

2.39.1