From: Zoran Zaric <zoran.zaric@amd.com>
To: <gdb-patches@sourceware.org>
Subject: [PATCH v4 12/28] Add indirect_implicit_ptr to dwarf_location class
Date: Fri, 5 Nov 2021 11:38:33 +0000 [thread overview]
Message-ID: <20211105113849.118800-13-zoran.zaric@amd.com> (raw)
In-Reply-To: <20211105113849.118800-1-zoran.zaric@amd.com>
From: Zoran Zaric <Zoran.Zaric@amd.com>
Similarly to the is_implicit_ptr_at method, the existing function
callback interface of the computed struct value, requiers a way to
apply indirection to an implicit pointer on a given offset of a given
length of an underlying location description.
This is different than reading from a struct value object (previously
described write_to_gdb_value method) in a way that the result of this
operation is expected to be a struct value of a pointed source level
variable instead of reading the value of that variable.
In the same way this is also different operation than the deref method
because the deref returns a read value of a given type from that
location description.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_location::indirect_implicit_ptr):
New method.
(dwarf_implicit_pointer::indirect_implicit_ptr): New method.
(dwarf_composite::indirect_implicit_ptr): New method.
---
gdb/dwarf2/expr.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 73 insertions(+)
diff --git a/gdb/dwarf2/expr.c b/gdb/dwarf2/expr.c
index a933ca2797d..185324f1d2d 100644
--- a/gdb/dwarf2/expr.c
+++ b/gdb/dwarf2/expr.c
@@ -465,6 +465,24 @@ class dwarf_location : public dwarf_entry
return false;
}
+ /* Recursive indirecting of the implicit pointer location description
+ if that location is or encapsulates an implicit pointer. The
+ operation is performed in a given FRAME context, using the TYPE as
+ the type of the pointer. Where POINTER_OFFSET is an offset
+ applied to that implicit pointer location description before the
+ operation. BIT_OFFSET is a bit offset applied to the location and
+ BIT_LENGTH is a bit length of the read.
+
+ Indirecting is only performed on the implicit pointer location
+ description parts of the location. */
+ virtual value *indirect_implicit_ptr (frame_info *frame, struct type *type,
+ LONGEST pointer_offset = 0,
+ LONGEST bit_offset = 0,
+ int bit_length = 0) const
+ {
+ return nullptr;
+ }
+
protected:
/* Architecture of the location. */
gdbarch *m_arch;
@@ -1101,6 +1119,11 @@ class dwarf_implicit_pointer final : public dwarf_location
return true;
}
+ value *indirect_implicit_ptr (frame_info *frame, struct type *type,
+ LONGEST pointer_offset = 0,
+ LONGEST bit_offset = 0,
+ int bit_length = 0) const override;
+
private:
/* Per object file data of the implicit pointer. */
dwarf2_per_objfile *m_per_objfile;
@@ -1153,6 +1176,17 @@ dwarf_implicit_pointer::read (frame_info *frame, gdb_byte *buf,
}
}
+value *
+dwarf_implicit_pointer::indirect_implicit_ptr (frame_info *frame,
+ struct type *type,
+ LONGEST pointer_offset,
+ LONGEST bit_offset,
+ int bit_length) const
+{
+ return indirect_synthetic_pointer (m_die_offset, m_offset + pointer_offset,
+ m_per_cu, m_per_objfile, frame, type);
+}
+
/* Composite location description entry. */
class dwarf_composite final : public dwarf_location
@@ -1189,6 +1223,11 @@ class dwarf_composite final : public dwarf_location
bool is_implicit_ptr_at (LONGEST bit_offset, int bit_length) const override;
+ value *indirect_implicit_ptr (frame_info *frame, struct type *type,
+ LONGEST pointer_offset = 0,
+ LONGEST bit_offset = 0,
+ int bit_length = 0) const override;
+
private:
/* Composite piece that contains a piece location
description and it's size. */
@@ -1422,6 +1461,40 @@ dwarf_composite::is_implicit_ptr_at (LONGEST bit_offset, int bit_length) const
return false;
}
+value *
+dwarf_composite::indirect_implicit_ptr (frame_info *frame, struct type *type,
+ LONGEST pointer_offset,
+ LONGEST bit_offset,
+ int bit_length) const
+{
+ LONGEST total_bit_offset = HOST_CHAR_BIT * m_offset
+ + m_bit_suboffset + bit_offset;
+
+ /* Advance to the first non-skipped piece. */
+ for (const piece &piece : m_pieces)
+ {
+ ULONGEST read_bit_length = piece.size;
+
+ if (total_bit_offset >= read_bit_length)
+ {
+ total_bit_offset -= read_bit_length;
+ continue;
+ }
+
+ read_bit_length -= total_bit_offset;
+
+ if (bit_length < read_bit_length)
+ read_bit_length = bit_length;
+
+ return piece.location->indirect_implicit_ptr (frame, type,
+ pointer_offset,
+ total_bit_offset,
+ read_bit_length);
+ }
+
+ return nullptr;
+}
+
struct piece_closure
{
/* Reference count. */
--
2.17.1
next prev parent reply other threads:[~2021-11-05 11:39 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-05 11:38 [PATCH v4 00/28] Allow location description on the DWARF stack Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 01/28] Add new register access interface to expr.c Zoran Zaric
2021-12-14 20:34 ` Tom Tromey
2021-11-05 11:38 ` [PATCH v4 02/28] Add new memory " Zoran Zaric
2021-12-14 20:42 ` Tom Tromey
2021-11-05 11:38 ` [PATCH v4 03/28] Add new classes that model DWARF stack element Zoran Zaric
2021-12-14 21:10 ` Tom Tromey
2022-01-12 10:23 ` Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 04/28] Add to_location method to dwarf_value class Zoran Zaric
2021-12-14 21:16 ` Tom Tromey
2022-01-12 10:51 ` Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 05/28] Add to_value method to dwarf_location class Zoran Zaric
2021-12-14 21:34 ` Tom Tromey
2022-01-12 12:14 ` Zoran Zaric
2022-01-12 18:42 ` Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 06/28] Add read method to location description classes Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 07/28] Add write " Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 08/28] Add deref " Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 09/28] Add read_from_gdb_value method to dwarf_location Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 10/28] Add write_to_gdb_value " Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 11/28] Add is_implicit_ptr_at " Zoran Zaric
2021-11-05 11:38 ` Zoran Zaric [this message]
2021-11-05 11:38 ` [PATCH v4 13/28] Add is_optimized_out to dwarf_location class Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 14/28] Add new computed struct value callback interface Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 15/28] Add to_gdb_value method to DWARF entry class Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 16/28] Change DWARF stack to use new dwarf_entry classes Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 17/28] Remove old computed struct value callbacks Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 18/28] Comments cleanup between expr.h and expr.c Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 19/28] Remove dwarf_expr_context from expr.h interface Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 20/28] Move read_addr_from_reg function to frame.c Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 21/28] Add frame info check to DW_OP_reg operations Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 22/28] Remove DWARF expression composition check Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 23/28] Add support for any location description in CFI Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 24/28] Add DWARF operations for byte and bit offset Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 25/28] Add support for DW_OP_LLVM_undefined operation Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 26/28] Add support for nested composite locations Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 27/28] Add DW_OP_LLVM_extend DWARF operation Zoran Zaric
2021-11-05 11:38 ` [PATCH v4 28/28] Add DW_OP_LLVM_select_bit_piece " Zoran Zaric
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