From: Philip Pronin <philipp@fb.com>
Date: Thu, 13 Oct 2016 17:09:36 +0000 (-0700)
Subject: fix .debug_aranges parsing
X-Git-Tag: v2016.10.17.00~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9f8df999c5f9107a564e658edea3d7da8a5c7c26;p=folly.git

fix .debug_aranges parsing

Summary:
Each sequence of tuples within an entires set is terminated with (0,
0) according to the DWARF standard (see 7.20 in
http://www.dwarfstd.org/doc/DWARF4.pdf).

Reviewed By: ot, luciang

Differential Revision: D4014952

fbshipit-source-id: c4b034c94adc4a0d9b052456c02919a54a79eaf1
---

diff --git a/folly/experimental/symbolizer/Dwarf.cpp b/folly/experimental/symbolizer/Dwarf.cpp
index f1087f80..7709dc0b 100644
--- a/folly/experimental/symbolizer/Dwarf.cpp
+++ b/folly/experimental/symbolizer/Dwarf.cpp
@@ -457,7 +457,7 @@ bool Dwarf::findDebugInfoOffset(uintptr_t address,
       auto start = read<uintptr_t>(chunk);
       auto length = read<uintptr_t>(chunk);
 
-      if (start == 0) {
+      if (start == 0 && length == 0) {
         break;
       }