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authornitachra <Nitika.Achra@amd.com>2020-04-07 18:36:00 +0530
committerTom Tromey <tromey@adacore.com>2020-04-07 09:55:35 -0600
commit85a9510ccbe8d897471cdd4f25a475329ae24498 (patch)
tree76da9db2dbd208d751edc9bd3c6689b2b80cd35f
parent9fc3eaae69b2a60c5688d6bfe334829a3964b17f (diff)
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DWARFv5: Info address command error in gdb with DWARFfv5.
GDB throws the error 'Unrecognized DWARF opcode 0x02 at 2' when running Info address command with the executable file compiled with -gdwarf-5 flag. This patch fixes this error. Tested by running the testsuite before and after the patch and there is no increase in the number of test cases that fails. Tested with both -gdwarf-4 and -gdwarf-5 flags. Also tested -gslit-dwarf along with -gdwarf-4 as well as -gdwarf-5 flags. Used clang version 10.0.0. This is the test case used- void bar(int arr[], int l, int m, int r) { int i, j, k, n1= m - l + 1, n2= r - m, L[n1], R[n2]; for (i = 0; i < n1; i++) L[i] = arr[l + i]; for (j = 0; j < n2; j++) R[j] = arr[m + 1+ j]; } int main() { int arr[] = {12, 11}; bar(arr,0,1,2); return 0; } clang -gdwarf-5 test.c -o test.out gdb test.out gdb> start gdb> step gdb> step gdb> step gdb> step gdb> info address L Symbol "L" is multi-location: Range 0x7c04007902bc5084-0x67fb876440700: a complex DWARF expression: 0: DW_OP_breg16 1 [$rip] Unrecognized DWARF opcode 0x02 at 2 gdb/ChangeLog: 2020-04-07 Nitika Achra <Nitika.Achra@amd.com> * dwarf2/loc.c (loclist_describe_location): Call the function decode_debug_loclists_ addresses if DWARF version is 5 or more because DW_LLE_start* or DW_LLE_offset_pair with DW_LLE_base_addressx are being emitted in DWARFv5. Add the newly added kind DW_LOC_OFFSET_PAIR also. The length of location description is an unsigned ULEB integer in DWARFv5 instead of unsigned integer.
-rw-r--r--gdb/ChangeLog9
-rw-r--r--gdb/dwarf2/loc.c23
2 files changed, 28 insertions, 4 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 4d3c70b..019b4d3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,14 @@
2020-04-07 Nitika Achra <Nitika.Achra@amd.com>
+ * dwarf2/loc.c (loclist_describe_location): Call the function decode_debug_loclists_
+ addresses if DWARF version is 5 or more because DW_LLE_start* or DW_LLE_offset_pair
+ with DW_LLE_base_addressx are being emitted in DWARFv5.
+ Add the newly added kind DW_LOC_OFFSET_PAIR also.
+ The length of location description is an unsigned ULEB integer in DWARFv5 instead of
+ unsigned integer.
+
+2020-04-07 Nitika Achra <Nitika.Achra@amd.com>
+
* dwarf2/loc.c (enum debug_loc_kind): Add a new kind DEBUG_LOC_OFFSET_PAIR.
(dwarf2_find_location_expression): Call the function decode_debug_loclists_
addresses if DWARF version is 5 or more. DW_LLE_start* or DW_LLE_offset_pair
diff --git a/gdb/dwarf2/loc.c b/gdb/dwarf2/loc.c
index ecd83ec..2ec4626 100644
--- a/gdb/dwarf2/loc.c
+++ b/gdb/dwarf2/loc.c
@@ -4459,15 +4459,20 @@ loclist_describe_location (struct symbol *symbol, CORE_ADDR addr,
enum debug_loc_kind kind;
const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */
- if (dlbaton->from_dwo)
+ if (dlbaton->per_cu->version () < 5 && dlbaton->from_dwo)
kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu,
loc_ptr, buf_end, &new_ptr,
&low, &high, byte_order);
- else
+ else if (dlbaton->per_cu->version () < 5)
kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr,
&low, &high,
byte_order, addr_size,
signed_addr_p);
+ else
+ kind = decode_debug_loclists_addresses (dlbaton->per_cu,
+ loc_ptr, buf_end, &new_ptr,
+ &low, &high, byte_order,
+ addr_size, signed_addr_p);
loc_ptr = new_ptr;
switch (kind)
{
@@ -4481,6 +4486,7 @@ loclist_describe_location (struct symbol *symbol, CORE_ADDR addr,
continue;
case DEBUG_LOC_START_END:
case DEBUG_LOC_START_LENGTH:
+ case DEBUG_LOC_OFFSET_PAIR:
break;
case DEBUG_LOC_BUFFER_OVERFLOW:
case DEBUG_LOC_INVALID_ENTRY:
@@ -4497,8 +4503,17 @@ loclist_describe_location (struct symbol *symbol, CORE_ADDR addr,
low = gdbarch_adjust_dwarf2_addr (gdbarch, low);
high = gdbarch_adjust_dwarf2_addr (gdbarch, high);
- length = extract_unsigned_integer (loc_ptr, 2, byte_order);
- loc_ptr += 2;
+ if (dlbaton->per_cu->version () < 5)
+ {
+ length = extract_unsigned_integer (loc_ptr, 2, byte_order);
+ loc_ptr += 2;
+ }
+ else
+ {
+ unsigned int bytes_read;
+ length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read);
+ loc_ptr += bytes_read;
+ }
/* (It would improve readability to print only the minimum
necessary digits of the second number of the range.) */