netdev - Re: [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's st

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Date:   Sat, 23 Jan 2021 22:23:41 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>, dwarves@...r.kernel.org,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Yonghong Song <yhs@...com>, Hao Luo <haoluo@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Mark Wielaard <mjw@...hat.com>
Subject: Re: [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's
 st_shndx values

On Thu, Jan 21, 2021 at 03:32:40PM -0800, Andrii Nakryiko wrote:

SNIP

> But the current variant looks broken. Oh, and
> elf_symtab__for_each_symbol() is similarly broken, can you please fix
> that as well?

we'll have to change its callers a bit, because of hanging 'else'
I'll send this separately if that's ok, when I figure out how to
test ctf code

jirka


---
diff --git a/elf_symtab.h b/elf_symtab.h
index 489e2b1a3505..6823a8c37ecf 100644
--- a/elf_symtab.h
+++ b/elf_symtab.h
@@ -99,10 +99,9 @@ elf_sym__get(Elf_Data *syms, Elf_Data *syms_sec_idx_table,
  * @index: uint32_t index
  * @sym: GElf_Sym iterator
  */
-#define elf_symtab__for_each_symbol(symtab, index, sym) \
-	for (index = 0, gelf_getsym(symtab->syms, index, &sym);\
-	     index < symtab->nr_syms; \
-	     index++, gelf_getsym(symtab->syms, index, &sym))
+#define elf_symtab__for_each_symbol(symtab, index, sym)		\
+	for (index = 0; index < symtab->nr_syms; index++)	\
+		if (gelf_getsym(symtab->syms, index, &sym))
 
 /**
  * elf_symtab__for_each_symbol_index - iterate through all the symbols,
diff --git a/libctf.h b/libctf.h
index 749be8955c52..ee5412bec77e 100644
--- a/libctf.h
+++ b/libctf.h
@@ -90,11 +90,9 @@ char *ctf__string(struct ctf *ctf, uint32_t ref);
  */
 #define ctf__for_each_symtab_function(ctf, index, sym)			      \
 	elf_symtab__for_each_symbol(ctf->symtab, index, sym)		      \
-		if (ctf__ignore_symtab_function(&sym,			      \
+		if (!ctf__ignore_symtab_function(&sym,			      \
 						elf_sym__name(&sym,	      \
 							      ctf->symtab)))  \
-			continue;					      \
-		else
 
 /**
  * ctf__for_each_symtab_object - iterate thru all the symtab objects
@@ -105,11 +103,9 @@ char *ctf__string(struct ctf *ctf, uint32_t ref);
  */
 #define ctf__for_each_symtab_object(ctf, index, sym)			      \
 	elf_symtab__for_each_symbol(ctf->symtab, index, sym)		      \
-		if (ctf__ignore_symtab_object(&sym,			      \
+		if (!ctf__ignore_symtab_object(&sym,			      \
 					      elf_sym__name(&sym,	      \
 							    ctf->symtab)))    \
-			continue;					      \
-		else
 
 
 #endif /* _LIBCTF_H */