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| author | Simon Marchi <simon.marchi@polymtl.ca> | 2020-05-28 15:47:53 -0400 |
|---|---|---|
| committer | Simon Marchi <simon.marchi@polymtl.ca> | 2020-05-28 15:47:53 -0400 |
| commit | 989ade05525047fc6b94f24ece5fc09e076027b0 (patch) | |
| tree | 572f397400e3008548b24603eeaebc15cc5ce594 | |
| parent | c47bae859a5af0d95224d90000df0e529f7c5aa0 (diff) | |
| download | gdb-989ade05525047fc6b94f24ece5fc09e076027b0.zip gdb-989ade05525047fc6b94f24ece5fc09e076027b0.tar.gz gdb-989ade05525047fc6b94f24ece5fc09e076027b0.tar.bz2 | |
gdb: add comment in dwarf_evaluate_loc_desc::push_dwarf_reg_entry_value
Add a comment to clarify why we temporarily override some of the
context's fields, and especially the per_objfile field. A longer
explanation can be found in this previous commit
44486dcf19b ("gdb: use caller objfile in dwarf_evaluate_loc_desc::push_dwarf_reg_entry_value")
gdb/ChangeLog:
* dwarf2/loc.c (class dwarf_evaluate_loc_desc)
<push_dwarf_reg_entry_value>: Add comment.
Change-Id: I60c6e1062799f729b30a9db78bcb6448783324b4
| -rw-r--r-- | gdb/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/dwarf2/loc.c | 6 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index cf46c4e..44300d2 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2020-05-28 Simon Marchi <simon.marchi@polymtl.ca> + + * dwarf2/loc.c (class dwarf_evaluate_loc_desc) + <push_dwarf_reg_entry_value>: Add comment. + 2020-05-28 Kevin Buettner <kevinb@redhat.com> Keith Seitz <keiths@redhat.com> diff --git a/gdb/dwarf2/loc.c b/gdb/dwarf2/loc.c index 1aab1a4..400bb4d 100644 --- a/gdb/dwarf2/loc.c +++ b/gdb/dwarf2/loc.c @@ -731,6 +731,12 @@ public: throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot resolve DW_AT_call_data_value")); + /* We are about to evaluate an expression in the context of the caller + of the current frame. This evaluation context may be different from + the current (callee's) context), so temporarily set the caller's context. + + It is possible for the caller to be from a different objfile from the + callee if the call is made through a function pointer. */ scoped_restore save_frame = make_scoped_restore (&this->frame, caller_frame); scoped_restore save_per_cu = make_scoped_restore (&this->per_cu, |