From: H.J. Lu <hjl.tools@gmail.com>
Date: Sun, 24 Jan 2021 15:00:34 +0000 (-0800)
Subject: DWARF-5: Ignore empty range in DWARF-5 line number tables
X-Git-Tag: binutils-2_35_2~14
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1ae65e19b214068e0fd3389f755d5a4ffffaca83;p=thirdparty%2Fbinutils-gdb.git

DWARF-5: Ignore empty range in DWARF-5 line number tables

The DWARF5 spec does indeed explicitly say: "A bounded range entry whose
beginning and ending address offsets are equal (including zero) indicates
an empty range and may be ignored."

Since arange_add already ignores empty ranges, remove the whole check
which is equivalent to the check plus explicit continue.

	PR binutils/27231
	* dwarf2.c (read_rnglists): Ignore empty range when parsing line
	number tables.

(cherry picked from commit 940d0202fd472b09d370fb483bf5a8ae99c9c830)
---

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 32deed3fbb2..6a2e70291d4 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2021-01-24  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR binutils/27231
+	* dwarf2.c (read_rnglists): Ignore empty range when parsing line
+	number tables.
+
 2021-01-23  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR binutils/27231
diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 1682be5a225..767e9731199 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -3276,9 +3276,6 @@ read_rnglists (struct comp_unit *unit, struct arange *arange,
 	  return FALSE;
 	}
 
-      if ((low_pc == 0 && high_pc == 0) || low_pc == high_pc)
-	return FALSE;
-
       if (!arange_add (unit, arange, low_pc, high_pc))
 	return FALSE;
     }