*** empty log message ***

[deliverable/binutils-gdb.git] / gdb / dwarf2-frame.c

diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index 0f6da4052b47c23de035eb09fec5517c17c71ea5..f9ca067dfe163e5acaf9c52437a48b6902fd230c 100644 (file)
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -309,6 +309,15 @@ no_get_frame_base (void *baton, gdb_byte **start, size_t *length)
                  _("Support for DW_OP_fbreg is unimplemented"));
 }
 
+/* Helper function for execute_stack_op.  */
+
+static CORE_ADDR
+no_get_frame_cfa (void *baton)
+{
+  internal_error (__FILE__, __LINE__,
+                 _("Support for DW_OP_call_frame_cfa is unimplemented"));
+}
+
 static CORE_ADDR
 no_get_tls_address (void *baton, CORE_ADDR offset)
 {
@@ -352,14 +361,18 @@ execute_stack_op (gdb_byte *exp, ULONGEST len, int addr_size,
 {
   struct dwarf_expr_context *ctx;
   CORE_ADDR result;
+  struct cleanup *old_chain;
 
   ctx = new_dwarf_expr_context ();
+  old_chain = make_cleanup_free_dwarf_expr_context (ctx);
+
   ctx->gdbarch = get_frame_arch (this_frame);
   ctx->addr_size = addr_size;
   ctx->baton = this_frame;
   ctx->read_reg = read_reg;
   ctx->read_mem = read_mem;
   ctx->get_frame_base = no_get_frame_base;
+  ctx->get_frame_cfa = no_get_frame_cfa;
   ctx->get_tls_address = no_get_tls_address;
 
   dwarf_expr_push (ctx, initial);
@@ -369,7 +382,7 @@ execute_stack_op (gdb_byte *exp, ULONGEST len, int addr_size,
   if (ctx->in_reg)
     result = read_reg (this_frame, result);
 
-  free_dwarf_expr_context (ctx);
+  do_cleanups (old_chain);
 
   return result;
 }
@@ -1247,6 +1260,23 @@ dwarf2_frame_base_sniffer (struct frame_info *this_frame)
 
   return NULL;
 }
+
+/* Compute the CFA for THIS_FRAME, but only if THIS_FRAME came from
+   the DWARF unwinder.  This is used to implement
+   DW_OP_call_frame_cfa.  */
+
+CORE_ADDR
+dwarf2_frame_cfa (struct frame_info *this_frame)
+{
+  while (get_frame_type (this_frame) == INLINE_FRAME)
+    this_frame = get_prev_frame (this_frame);
+  /* This restriction could be lifted if other unwinders are known to
+     compute the frame base in a way compatible with the DWARF
+     unwinder.  */
+  if (! frame_unwinder_is (this_frame, &dwarf2_frame_unwind))
+    error (_("can't compute CFA for this frame"));
+  return get_frame_base (this_frame);
+}
 \f
 const struct objfile_data *dwarf2_frame_objfile_data;