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[PATCH] Add support for DW_OP_GNU_variable_value to readelf
- From: Kevin Buettner <kevinb at redhat dot com>
- To: binutils at sourceware dot org
- Date: Thu, 2 Aug 2018 20:51:54 -0700
- Subject: [PATCH] Add support for DW_OP_GNU_variable_value to readelf
As indicated by the subject, this patch adds support for the DWARF
expression opcode DW_OP_GNU_variable_value to readelf.
It's pretty much a copy/paste of DW_OP_call_ref with the obvious name
changes for the printf statements. The FIXME comment comes from that
copy/paste.
binutils/ChangeLog:
* dwarf.c (decode_location_expresion): Add case for
DW_OP_GNU_variable_value.
---
binutils/dwarf.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/binutils/dwarf.c b/binutils/dwarf.c
index 81060bf..ad961b8 100644
--- a/binutils/dwarf.c
+++ b/binutils/dwarf.c
@@ -1575,6 +1575,25 @@ decode_location_expression (unsigned char * data,
data += bytes_read;
printf ("DW_OP_GNU_const_index <0x%s>", dwarf_vmatoa ("x", uvalue));
break;
+ case DW_OP_GNU_variable_value:
+ /* FIXME: Strictly speaking for 64-bit DWARF3 files
+ this ought to be an 8-byte wide computation. */
+ if (dwarf_version == -1)
+ {
+ printf (_("(DW_OP_GNU_variable_value in frame info)"));
+ /* No way to tell where the next op is, so just bail. */
+ return need_frame_base;
+ }
+ if (dwarf_version == 2)
+ {
+ SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
+ }
+ else
+ {
+ SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
+ }
+ printf ("DW_OP_GNU_variable_value: <0x%s>", dwarf_vmatoa ("x", uvalue));
+ break;
/* HP extensions. */
case DW_OP_HP_is_value: