[PATCH 37/43] Add frame info check to DW_OP_reg operations

[Zoran Zaric via Gdb-patches <gdb-patches@sourceware.org>]

After enabling location description to be on a DWARF stack, it is now
needed to check the frame context information validity when creating a
register location description.

gdb/ChangeLog:

	* dwarf2/expr.c (dwarf_expr_context::execute_stack_op): Add
	check_frame_info call for DW_OP_reg operations.
---
 gdb/dwarf2/expr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gdb/dwarf2/expr.c b/gdb/dwarf2/expr.c
index b5f408fead1..977ac64dd68 100644
--- a/gdb/dwarf2/expr.c
+++ b/gdb/dwarf2/expr.c
@@ -3072,6 +3072,7 @@ dwarf_expr_context::execute_stack_op (const gdb_byte *op_ptr,
 	case DW_OP_reg30:
 	case DW_OP_reg31:
 	  dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_reg");
+	  ensure_have_frame (this->frame, "DW_OP_reg");
 
 	  result = op - DW_OP_reg0;
 	  result_entry
@@ -3081,6 +3082,7 @@ dwarf_expr_context::execute_stack_op (const gdb_byte *op_ptr,
 	case DW_OP_regx:
 	  op_ptr = safe_read_uleb128 (op_ptr, op_end, &reg);
 	  dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx");
+	  ensure_have_frame (this->frame, "DW_OP_regx");
 
 	  result = reg;
 	  result_entry = std::make_shared<dwarf_register> (this->gdbarch, reg);
-- 
2.17.1