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gdb/SOURCES/gdb-rhbz1905701-DWARF-data_location.patch

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import gdb-8.2-15.el8
2021-03-30 18:17:43 +00:00
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Keith Seitz <keiths@redhat.com>
Date: Wed, 2 Dec 2020 17:39:33 -0500
Subject: gdb-rhbz1905701-DWARF-data_location.patch
;; Backport "fortran dynamic type related fixes"
;; Andrew Burgess (RH BZ 1905701)
commit e79eb02f2f09baecffb144bac6804f975065466f
gdb/fortran: resolve dynamic types when readjusting after an indirection
After dereferencing a pointer (in value_ind) or following a
reference (in coerce_ref) we call readjust_indirect_value_type to
"fixup" the type of the resulting value object.
This fixup handles cases relating to the type of the resulting object
being different (a sub-class) of the original pointers target type.
If we encounter a pointer to a dynamic type then after dereferencing a
pointer (in value_ind) the type of the object created will have had
its dynamic type resolved. However, in readjust_indirect_value_type,
we use the target type of the original pointer to "fixup" the type of
the resulting value. In this case, the target type will be a dynamic
type, so the resulting value object, once again has a dynamic type.
This then triggers an assertion later within GDB.
The solution I propose here is that we call resolve_dynamic_type on
the pointer's target type (within readjust_indirect_value_type) so
that the resulting value is not converted back to a dynamic type.
The test case is based on the original test in the bug report.
gdb/ChangeLog:
PR fortran/23051
PR fortran/26139
* valops.c (value_ind): Pass address to
readjust_indirect_value_type.
* value.c (readjust_indirect_value_type): Make parameter
non-const, and add extra address parameter. Resolve original type
before using it.
* value.h (readjust_indirect_value_type): Update function
signature and comment.
gdb/testsuite/ChangeLog:
PR fortran/23051
PR fortran/26139
* gdb.fortran/class-allocatable-array.exp: New file.
* gdb.fortran/class-allocatable-array.f90: New file.
* gdb.fortran/pointer-to-pointer.exp: New file.
* gdb.fortran/pointer-to-pointer.f90: New file.
diff --git a/gdb/testsuite/gdb.dwarf2/graalvm-data-loc2.c b/gdb/testsuite/gdb.dwarf2/graalvm-data-loc2.c
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/graalvm-data-loc2.c
@@ -0,0 +1,63 @@
+/* Copyright 2014-2020 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* This C file simulates the implementation of object pointers in
+ GraalVM Java native images where the object data is not addressed
+ directly. It serves as a regression test for a bug where printing
+ of such redirected data structures suffers from a gdb exception.
+
+ Debugging information on how to decode an object pointer to
+ identify the address of the underlying data will be generated
+ separately by the testcase using that file. */
+
+#include <stdlib.h>
+#include <string.h>
+
+struct Object {
+ struct Object *next;
+ int val;
+};
+
+struct Object *testOop;
+
+extern int debugMe() {
+ return 0;
+}
+
+struct Object *newObject() {
+ char *bytes = malloc(sizeof(struct Object));
+ return (struct Object *)bytes;
+}
+
+int
+main (void)
+{
+ struct Object *obj1 = newObject();
+ struct Object *obj2 = newObject();
+ struct Object *obj3 = newObject();
+ obj1->val = 0;
+ obj2->val = 1;
+ obj3->val = 2;
+
+ obj1->next = obj2;
+ obj2->next = obj3;
+ obj3->next = obj1;
+
+ testOop = obj1;
+
+ return debugMe();
+}
diff --git a/gdb/testsuite/gdb.dwarf2/graalvm-data-loc2.exp b/gdb/testsuite/gdb.dwarf2/graalvm-data-loc2.exp
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/graalvm-data-loc2.exp
@@ -0,0 +1,122 @@
+# Copyright 2014-2020 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+load_lib dwarf.exp
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+if {![dwarf2_support]} {
+ return 0
+}
+
+standard_testfile .c -dw.S
+
+if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
+ return -1
+}
+
+# Make some DWARF for the test.
+set asm_file [standard_output_file $srcfile2]
+Dwarf::assemble $asm_file {
+
+ cu {} {
+ DW_TAG_compile_unit {
+ {DW_AT_language @DW_LANG_C99}
+ {DW_AT_name data-loc2.c}
+ {DW_AT_comp_dir /tmp}
+ } {
+ declare_labels integer_label struct_label pointer_label
+
+ integer_label: DW_TAG_base_type {
+ {DW_AT_byte_size 4 DW_FORM_sdata}
+ {DW_AT_encoding @DW_ATE_signed}
+ {DW_AT_name integer}
+ }
+
+ struct_label: DW_TAG_structure_type {
+ {DW_AT_name "Object"}
+ {DW_AT_byte_size 20 DW_FORM_sdata}
+ {DW_AT_data_location {
+ DW_OP_push_object_address
+ } SPECIAL_expr}
+ } {
+ member {
+ {name next}
+ {type :$pointer_label}
+ {data_member_location 0 data1}
+ }
+ member {
+ {name val}
+ {type :$integer_label}
+ {data_member_location 8 data1}
+ }
+ }
+ pointer_label: DW_TAG_pointer_type {
+ {DW_AT_byte_size 4 DW_FORM_sdata}
+ {DW_AT_type :$struct_label}
+ }
+ DW_TAG_variable {
+ {DW_AT_name testOop}
+ {DW_AT_type :$pointer_label}
+ {DW_AT_location {
+ DW_OP_addr [gdb_target_symbol testOop]
+ } SPECIAL_expr}
+ {external 1 flag}
+ }
+ }
+ }
+}
+
+# Now that we've generated the DWARF debugging info, rebuild our
+# program using our debug info instead of the info generated by
+# the compiler.
+
+if { [prepare_for_testing "failed to prepare" ${testfile} \
+ [list $srcfile $asm_file] {nodebug}] } {
+ return -1
+}
+
+if ![runto_main] {
+ return -1
+}
+
+# ensure the object network is set up as expected and check that
+# printing of structs which employ the data_location does not
+# fail with a gdb exception
+
+gdb_test "break debugMe" \
+ "Breakpoint .*" \
+ "set breakpoint at debugMe"
+
+gdb_continue_to_breakpoint "continue to debugMe"
+
+gdb_test "print testOop->val" \
+ ".* = 0"
+
+gdb_test "print testOop->next->val" \
+ ".* = 1"
+
+gdb_test "print testOop->next->next->val" \
+ ".* = 2"
+
+gdb_test "print *testOop" \
+ ".* = {next = .*, val = 0}" \
+ "print contents of struct"
+
+gdb_test "print *testOop->next" \
+ ".* = {next = .*, val = 1}" \
+ "print contents of an indirect struct"
+
+gdb_test "print *testOop->next->next" \
+ ".* = {next = .*, val = 2}" \
+ "print contents of a double indirect struct"
diff --git a/gdb/testsuite/gdb.fortran/class-allocatable-array.exp b/gdb/testsuite/gdb.fortran/class-allocatable-array.exp
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.fortran/class-allocatable-array.exp
@@ -0,0 +1,43 @@
+# Copyright 2020 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/> .
+
+# Test that GDB can print an allocatable array that is a data field
+# within a class like type.
+
+if {[skip_fortran_tests]} { return -1 }
+
+standard_testfile ".f90"
+load_lib fortran.exp
+
+if {[prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \
+ {debug f90}]} {
+ return -1
+}
+
+if {![runto MAIN__]} {
+ untested main"could not run to main"
+ return -1
+}
+
+gdb_breakpoint [gdb_get_line_number "Break Here"]
+gdb_continue_to_breakpoint "Break Here"
+
+# If this first test fails then the Fortran compiler being used uses
+# different names, or maybe a completely different approach, for
+# representing class like structures. The following tests are
+# cetainly going to fail.
+gdb_test "print this" " = \\( _data = \[^\r\n\]+, _vptr = \[^\r\n\]+\\)"
+gdb_test "print this%_data" " = \\(PTR TO -> \\( Type test_type \\)\\) \[^\r\n\]+"
+gdb_test "print this%_data%b" " = \\(\\( 1, 2, 3\\) \\( 4, 5, 6\\) \\)"
diff --git a/gdb/testsuite/gdb.fortran/class-allocatable-array.f90 b/gdb/testsuite/gdb.fortran/class-allocatable-array.f90
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.fortran/class-allocatable-array.f90
@@ -0,0 +1,54 @@
+! Copyright 2020 Free Software Foundation, Inc.
+!
+! This program is free software; you can redistribute it and/or modify
+! it under the terms of the GNU General Public License as published by
+! the Free Software Foundation; either version 3 of the License, or
+! (at your option) any later version.
+!
+! This program is distributed in the hope that it will be useful,
+! but WITHOUT ANY WARRANTY; without even the implied warranty of
+! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+! GNU General Public License for more details.
+!
+! You should have received a copy of the GNU General Public License
+! along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+module test_module
+ type test_type
+ integer a
+ real, allocatable :: b (:, :)
+ contains
+ procedure :: test_proc
+ end type test_type
+
+contains
+
+ subroutine test_proc (this)
+ class(test_type), intent (inout) :: this
+ allocate (this%b (3, 2))
+ call fill_array_2d (this%b)
+ print *, "" ! Break Here
+ contains
+ ! Helper subroutine to fill 2-dimensional array with unique
+ ! values.
+ subroutine fill_array_2d (array)
+ real, dimension (:,:) :: array
+ real :: counter
+
+ counter = 1.0
+ do i=LBOUND (array, 2), UBOUND (array, 2), 1
+ do j=LBOUND (array, 1), UBOUND (array, 1), 1
+ array (j,i) = counter
+ counter = counter + 1
+ end do
+ end do
+ end subroutine fill_array_2d
+ end subroutine test_proc
+end module
+
+program test
+ use test_module
+ implicit none
+ type(test_type) :: t
+ call t%test_proc ()
+end program test
diff --git a/gdb/testsuite/gdb.fortran/pointer-to-pointer.exp b/gdb/testsuite/gdb.fortran/pointer-to-pointer.exp
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.fortran/pointer-to-pointer.exp
@@ -0,0 +1,46 @@
+# Copyright 2020 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/> .
+
+# Test for GDB printing a pointer to a type containing a buffer.
+
+if {[skip_fortran_tests]} { return -1 }
+
+standard_testfile ".f90"
+load_lib fortran.exp
+
+if {[prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \
+ {debug f90}]} {
+ return -1
+}
+
+if {![runto MAIN__]} {
+ untested "could not run to main"
+ return -1
+}
+
+gdb_breakpoint [gdb_get_line_number "Break Here"]
+gdb_continue_to_breakpoint "Break Here"
+
+gdb_test "print *buffer" \
+ " = \\( alpha = \\(1\\.5, 2\\.5, 3\\.5, 4\\.5, 5\\.5\\) \\)"
+
+set l_buffer_type [multi_line \
+ "Type l_buffer" \
+ " real\\(kind=4\\) :: alpha\\(.\\)" \
+ "End Type l_buffer" ]
+
+gdb_test "ptype buffer" "type = PTR TO -> \\( ${l_buffer_type} \\)"
+gdb_test "ptype *buffer" "type = ${l_buffer_type}"
+gdb_test "ptype buffer%alpha" "type = real\\(kind=4\\) \\(5\\)"
diff --git a/gdb/testsuite/gdb.fortran/pointer-to-pointer.f90 b/gdb/testsuite/gdb.fortran/pointer-to-pointer.f90
new file mode 100644
--- /dev/null
+++ b/gdb/testsuite/gdb.fortran/pointer-to-pointer.f90
@@ -0,0 +1,34 @@
+! Copyright 2020 Free Software Foundation, Inc.
+!
+! This program is free software; you can redistribute it and/or modify
+! it under the terms of the GNU General Public License as published by
+! the Free Software Foundation; either version 3 of the License, or
+! (at your option) any later version.
+!
+! This program is distributed in the hope that it will be useful,
+! but WITHOUT ANY WARRANTY; without even the implied warranty of
+! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+! GNU General Public License for more details.
+!
+! You should have received a copy of the GNU General Public License
+! along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+program allocate_array
+
+ type l_buffer
+ real, dimension(:), pointer :: alpha
+ end type l_buffer
+ type(l_buffer), pointer :: buffer
+
+ allocate (buffer)
+ allocate (buffer%alpha (5))
+
+ buffer%alpha (1) = 1.5
+ buffer%alpha (2) = 2.5
+ buffer%alpha (3) = 3.5
+ buffer%alpha (4) = 4.5
+ buffer%alpha (5) = 5.5
+
+ print *, buffer%alpha ! Break Here.
+
+end program allocate_array
diff --git a/gdb/valops.c b/gdb/valops.c
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -1573,42 +1573,34 @@ value_ind (struct value *arg1)
if (TYPE_CODE (base_type) == TYPE_CODE_PTR)
{
struct type *enc_type;
- CORE_ADDR addr;
-
- if (type_not_associated (base_type))
- error (_("Attempt to take contents of a not associated pointer."));
-
- if (NULL != TYPE_DATA_LOCATION (TYPE_TARGET_TYPE (base_type)))
- addr = value_address (arg1);
- else
- addr = value_as_address (arg1);
-
- if (addr != 0)
- TYPE_TARGET_TYPE (base_type) =
- resolve_dynamic_type (TYPE_TARGET_TYPE (base_type), NULL, addr);
/* We may be pointing to something embedded in a larger object.
Get the real type of the enclosing object. */
enc_type = check_typedef (value_enclosing_type (arg1));
enc_type = TYPE_TARGET_TYPE (enc_type);
+ CORE_ADDR base_addr;
if (TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_FUNC
|| TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_METHOD)
- /* For functions, go through find_function_addr, which knows
- how to handle function descriptors. */
- arg2 = value_at_lazy (enc_type,
- find_function_addr (arg1, NULL));
+ {
+ /* For functions, go through find_function_addr, which knows
+ how to handle function descriptors. */
+ base_addr = find_function_addr (arg1, NULL);
+ }
else
- /* Retrieve the enclosing object pointed to. */
- arg2 = value_at_lazy (enc_type,
- (addr - value_pointed_to_offset (arg1)));
+ {
+ /* Retrieve the enclosing object pointed to. */
+ base_addr = (value_as_address (arg1)
+ - value_pointed_to_offset (arg1));
+ }
+ arg2 = value_at_lazy (enc_type, base_addr);
enc_type = value_type (arg2);
- return readjust_indirect_value_type (arg2, enc_type, base_type, arg1);
+ return readjust_indirect_value_type (arg2, enc_type, base_type,
+ arg1, base_addr);
}
error (_("Attempt to take contents of a non-pointer value."));
- return 0; /* For lint -- never reached. */
}
/* Create a value for an array by allocating space in GDB, copying the
diff --git a/gdb/value.c b/gdb/value.c
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -3611,10 +3611,19 @@ coerce_ref_if_computed (const struct value *arg)
struct value *
readjust_indirect_value_type (struct value *value, struct type *enc_type,
const struct type *original_type,
- const struct value *original_value)
+ struct value *original_value,
+ CORE_ADDR original_value_address)
{
+ gdb_assert (TYPE_CODE (original_type) == TYPE_CODE_PTR
+ || TYPE_IS_REFERENCE (original_type));
+
+ struct type *original_target_type = TYPE_TARGET_TYPE (original_type);
+ struct type *resolved_original_target_type
+ = resolve_dynamic_type (original_target_type, NULL,
+ original_value_address);
+
/* Re-adjust type. */
- deprecated_set_value_type (value, TYPE_TARGET_TYPE (original_type));
+ deprecated_set_value_type (value, resolved_original_target_type);
/* Add embedding info. */
set_value_enclosing_type (value, enc_type);
@@ -3641,12 +3650,11 @@ coerce_ref (struct value *arg)
enc_type = check_typedef (value_enclosing_type (arg));
enc_type = TYPE_TARGET_TYPE (enc_type);
- retval = value_at_lazy (enc_type,
- unpack_pointer (value_type (arg),
- value_contents (arg)));
+ CORE_ADDR addr = unpack_pointer (value_type (arg), value_contents (arg));
+ retval = value_at_lazy (enc_type, addr);
enc_type = value_type (retval);
- return readjust_indirect_value_type (retval, enc_type,
- value_type_arg_tmp, arg);
+ return readjust_indirect_value_type (retval, enc_type, value_type_arg_tmp,
+ arg, addr);
}
struct value *
diff --git a/gdb/value.h b/gdb/value.h
--- a/gdb/value.h
+++ b/gdb/value.h
@@ -487,7 +487,9 @@ extern struct value *coerce_ref_if_computed (const struct value *arg);
/* Setup a new value type and enclosing value type for dereferenced value VALUE.
ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and
- ORIGINAL_VAL are the type and value of the original reference or pointer.
+ ORIGINAL_VAL are the type and value of the original reference or
+ pointer. ORIGINAL_VALUE_ADDRESS is the address within VALUE, that is
+ the address that was dereferenced.
Note, that VALUE is modified by this function.
@@ -496,7 +498,8 @@ extern struct value *coerce_ref_if_computed (const struct value *arg);
extern struct value * readjust_indirect_value_type (struct value *value,
struct type *enc_type,
const struct type *original_type,
- const struct value *original_val);
+ struct value *original_val,
+ CORE_ADDR original_value_address);
/* Convert a REF to the object referenced. */
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