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[PATCH 07/11] Resolve dynamic target types of pointers.
- From: Sebastian Basierski <sbasierski at pl dot sii dot eu>
- To: gdb-patches at sourceware dot org
- Date: Tue, 27 Nov 2018 19:31:35 +0100
- Subject: [PATCH 07/11] Resolve dynamic target types of pointers.
- References: <20181127183139.71170-1-sbasierski@pl.sii.eu>
From: Bernhard Heckel <bernhard.heckel@intel.com>
When dereferencing pointers to dynamic target types,
resolve the target type.
2016-06-30 Bernhard Heckel <bernhard.heckel@intel.com>
gdb/Changelog:
* NEWS: Added entry.
* c-valprint.c (c_print_val): Resolve dynamic target types.
* valops.c (value_ind): Resolve dynamic target types.
* valprint.c (check_printable): Don't shortcut not associated
pointers.
gdb/Testsuite/Changelog:
* pointers.f90: Added pointer to dynamic types.
* gdb.fortran/pointers.exp: New.
---
gdb/NEWS | 2 +
gdb/c-valprint.c | 22 ++++
gdb/testsuite/gdb.cp/vla-cxx.exp | 6 ++
gdb/testsuite/gdb.fortran/pointers.exp | 137 +++++++++++++++++++++++++
gdb/testsuite/gdb.fortran/pointers.f90 | 17 +++
gdb/valops.c | 16 ++-
gdb/valprint.c | 6 --
7 files changed, 198 insertions(+), 8 deletions(-)
create mode 100644 gdb/testsuite/gdb.fortran/pointers.exp
diff --git a/gdb/NEWS b/gdb/NEWS
index ff9b192a38..8fe8faecb6 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -650,6 +650,8 @@ show disassembler-options
* GDBserver now supports recording btrace without maintaining an active
GDB connection.
+* Fortran: Support pointers to dynamic types.
+
* GDB now supports a negative repeat count in the 'x' command to examine
memory backward from the given address. For example:
diff --git a/gdb/c-valprint.c b/gdb/c-valprint.c
index c4c0918e26..254ebd1ee6 100644
--- a/gdb/c-valprint.c
+++ b/gdb/c-valprint.c
@@ -653,6 +653,28 @@ c_value_print (struct value *val, struct ui_file *stream,
else
{
/* normal case */
+ if (TYPE_CODE (type) == TYPE_CODE_PTR
+ && is_dynamic_type (type))
+ {
+ CORE_ADDR addr;
+ if (NULL != TYPE_DATA_LOCATION (TYPE_TARGET_TYPE (type)))
+ addr = value_address (val);
+ else
+ addr = value_as_address (val);
+
+ /* We resolve the target-type only when the
+ pointer is associated. */
+ if ((addr != 0)
+ && !type_not_associated (type))
+ TYPE_TARGET_TYPE (type) =
+ resolve_dynamic_type (TYPE_TARGET_TYPE (type),
+ NULL, addr);
+ }
+ else
+ {
+ /* Do nothing. References are already resolved from the beginning,
+ only pointers are resolved when we actual need the target. */
+ }
fprintf_filtered (stream, "(");
type_print (value_type (val), "", stream, -1);
fprintf_filtered (stream, ") ");
diff --git a/gdb/testsuite/gdb.cp/vla-cxx.exp b/gdb/testsuite/gdb.cp/vla-cxx.exp
index 2cf2d9868f..32e4329f93 100644
--- a/gdb/testsuite/gdb.cp/vla-cxx.exp
+++ b/gdb/testsuite/gdb.cp/vla-cxx.exp
@@ -26,6 +26,10 @@ if ![runto_main] {
gdb_breakpoint [gdb_get_line_number "Before pointer assignment"]
gdb_continue_to_breakpoint "Before pointer assignment"
gdb_test "ptype ptr" "int \\(\\*\\)\\\[variable length\\\]" "ptype ptr, Before pointer assignment"
+gdb_test "print ptr" "\\(int \\(\\*\\)\\\[variable length\\\]\\) 0x0" \
+ "print ptr, Before pointer assignment"
+gdb_test "print *ptr" "Cannot access memory at address 0x0" \
+ "print *ptr, Before pointer assignment"
gdb_breakpoint [gdb_get_line_number "vlas_filled"]
gdb_continue_to_breakpoint "vlas_filled"
@@ -38,3 +42,5 @@ gdb_test "print vlaref" " = \\(int \\(&\\)\\\[3\\\]\\) @$hex: \\{5, 7, 9\\}"
gdb_test "print vlaref2" " = \\(.*\\) @$hex: \\{5, 7, 9\\}"
gdb_test "print c" " = \\{e = \\{c = @$hex\\}\\}"
gdb_test "ptype ptr" "int \\(\\*\\)\\\[3\\\]"
+gdb_test "print ptr" "\\(int \\(\\*\\)\\\[3\\\]\\) $hex"
+gdb_test "print *ptr" " = \\{5, 7, 9\\}"
diff --git a/gdb/testsuite/gdb.fortran/pointers.exp b/gdb/testsuite/gdb.fortran/pointers.exp
new file mode 100644
index 0000000000..0f6c9d3cdf
--- /dev/null
+++ b/gdb/testsuite/gdb.fortran/pointers.exp
@@ -0,0 +1,137 @@
+# Copyright 2018 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/>.
+
+standard_testfile "pointers.f90"
+load_lib fortran.exp
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \
+ {debug f90 quiet}] } {
+ return -1
+}
+
+if ![runto_main] {
+ untested "could not run to main"
+ return -1
+}
+
+# Depending on the compiler being used, the type names can be printed differently.
+set logical [fortran_logical4]
+set real [fortran_real4]
+set int [fortran_int4]
+set complex [fortran_complex4]
+
+
+gdb_breakpoint [gdb_get_line_number "Before pointer assignment"]
+gdb_continue_to_breakpoint "Before pointer assignment"
+gdb_test "print logp" "= \\(PTR TO -> \\( $logical \\)\\) 0x0" \
+ "print logp, not associated"
+gdb_test "print *logp" "Cannot access memory at address 0x0" \
+ "print *logp, not associated"
+gdb_test "print comp" "= \\(PTR TO -> \\( $complex \\)\\) 0x0" \
+ "print comp, not associated"
+gdb_test "print *comp" "Cannot access memory at address 0x0" \
+ "print *comp, not associated"
+gdb_test "print charp" "= \\(PTR TO -> \\( character\\*1 \\)\\) 0x0" \
+ "print charp, not associated"
+gdb_test "print *charp" "Cannot access memory at address 0x0" \
+ "print *charp, not associated"
+gdb_test "print charap" "= \\(PTR TO -> \\( character\\*3 \\)\\) 0x0" \
+ "print charap, not associated"
+gdb_test "print *charap" "Cannot access memory at address 0x0" \
+ "print *charap, not associated"
+gdb_test "print intp" "= \\(PTR TO -> \\( $int \\)\\) 0x0" \
+ "print intp, not associated"
+gdb_test "print *intp" "Cannot access memory at address 0x0" \
+ "print *intp, not associated"
+set test "print intap, not associated"
+gdb_test_multiple "print intap" $test {
+ -re " = \\(PTR TO -> \\( $int \\(:,:\\)\\)\\) <not associated>\r\n$gdb_prompt $" {
+ pass $test
+ }
+ -re " = <not associated>\r\n$gdb_prompt $" {
+ pass $test
+ }
+}
+gdb_test "print realp" "= \\(PTR TO -> \\( $real \\)\\) 0x0" \
+ "print realp, not associated"
+gdb_test "print *realp" "Cannot access memory at address 0x0" \
+ "print *realp, not associated"
+gdb_test "print \$my_var = intp" "= \\(PTR TO -> \\( $int \\)\\) 0x0"
+
+
+gdb_breakpoint [gdb_get_line_number "Before value assignment"]
+gdb_continue_to_breakpoint "Before value assignment"
+gdb_test "print *(twop)%ivla2" "= <not allocated>"
+
+
+gdb_breakpoint [gdb_get_line_number "After value assignment"]
+gdb_continue_to_breakpoint "After value assignment"
+gdb_test "print logp" "= \\(PTR TO -> \\( $logical \\)\\) $hex\( <.*>\)?"
+gdb_test "print *logp" "= \\.TRUE\\."
+gdb_test "print comp" "= \\(PTR TO -> \\( $complex \\)\\) $hex\( <.*>\)?"
+gdb_test "print *comp" "= \\(1,2\\)"
+gdb_test "print charp" "= \\(PTR TO -> \\( character\\*1 \\)\\) $hex\( <.*>\)?"
+gdb_test "print *charp" "= 'a'"
+gdb_test "print charap" "= \\(PTR TO -> \\( character\\*3 \\)\\) $hex\( <.*>\)?"
+gdb_test "print *charap" "= 'abc'"
+gdb_test "print intp" "= \\(PTR TO -> \\( $int \\)\\) $hex\( <.*>\)?"
+gdb_test "print *intp" "= 10"
+set test_name "print intap, associated"
+gdb_test_multiple "print intap" $test_name {
+ -re "= \\(\\( 1, 1, 3(, 1){7}\\) \\( 1(, 1){9}\\) \\)\r\n$gdb_prompt $" {
+ pass $test_name
+ }
+ -re "= \\(PTR TO -> \\( $int \\(10,2\\)\\)\\) $hex\( <.*>\)?\r\n$gdb_prompt $" {
+ gdb_test "print *intap" "= \\(\\( 1, 1, 3(, 1){7}\\) \\( 1(, 1){9}\\) \\)"
+ pass $test_name
+ }
+}
+set test_name "print intvlap, associated"
+gdb_test_multiple "print intvlap" $test_name {
+ -re "= \\(2, 2, 2, 4(, 2){6}\\)\r\n$gdb_prompt $" {
+ pass $test_name
+ }
+ -re "= \\(PTR TO -> \\( $int \\(10\\)\\)\\) $hex\( <.*>\)?\r\n$gdb_prompt $" {
+ gdb_test "print *intvlap" "= \\(2, 2, 2, 4(, 2){6}\\)"
+ pass $test_name
+ }
+}
+gdb_test "print realp" "= \\(PTR TO -> \\( $real \\)\\) $hex\( <.*>\)?"
+gdb_test "print *realp" "= 3\\.14000\\d+"
+gdb_test "print arrayOfPtr(2)%p" "= \\(PTR TO -> \\( Type two \\)\\) $hex\( <.*>\)?"
+gdb_test "print *(arrayOfPtr(2)%p)" \
+ "= \\( ivla1 = \\(11, 12, 13\\), ivla2 = \\(\\( 211, 221\\) \\( 212, 222\\) \\) \\)"
+set test_name "print arrayOfPtr(3)%p"
+gdb_test_multiple $test_name $test_name {
+ -re "= \\(PTR TO -> \\( Type two \\)\\) <not associated>\r\n$gdb_prompt $" {
+ pass $test_name
+ }
+ -re "= \\(PTR TO -> \\( Type two \\)\\) 0x0\r\n$gdb_prompt $" {
+ pass $test_name
+ }
+}
+set test_name "print *(arrayOfPtr(3)%p), associated"
+gdb_test_multiple "print *(arrayOfPtr(3)%p)" $test_name {
+ -re "Cannot access memory at address 0x0\r\n$gdb_prompt $" {
+ pass $test_name
+ }
+ -re "Attempt to take contents of a not associated pointer.\r\n$gdb_prompt $" {
+ pass $test_name
+ }
+}
+gdb_test "print *((integer*) &inta + 2)" "= 3" "print temporary pointer, array"
+gdb_test "print *((integer*) &intvla + 3)" "= 4" "print temporary pointer, allocated vla"
+gdb_test "print \$pc" "= \\(PTR TO -> \\( void \\(\\)\\(\\)\\)\\) $hex <pointers\\+\\d+>" \
+ "Print program counter"
diff --git a/gdb/testsuite/gdb.fortran/pointers.f90 b/gdb/testsuite/gdb.fortran/pointers.f90
index dd4fe811be..c36398d76a 100644
--- a/gdb/testsuite/gdb.fortran/pointers.f90
+++ b/gdb/testsuite/gdb.fortran/pointers.f90
@@ -20,14 +20,20 @@ program pointers
integer, allocatable :: ivla2 (:, :)
end type two
+ type :: twoPtr
+ type (two), pointer :: p
+ end type twoPtr
+
logical, target :: logv
complex, target :: comv
character, target :: charv
character (len=3), target :: chara
integer, target :: intv
integer, target, dimension (10,2) :: inta
+ integer, target, allocatable, dimension (:) :: intvla
real, target :: realv
type(two), target :: twov
+ type(twoPtr) :: arrayOfPtr (3)
logical, pointer :: logp
complex, pointer :: comp
@@ -35,6 +41,7 @@ program pointers
character (len=3), pointer:: charap
integer, pointer :: intp
integer, pointer, dimension (:,:) :: intap
+ integer, pointer, dimension (:) :: intvlap
real, pointer :: realp
type(two), pointer :: twop
@@ -44,8 +51,12 @@ program pointers
nullify (charap)
nullify (intp)
nullify (intap)
+ nullify (intvlap)
nullify (realp)
nullify (twop)
+ nullify (arrayOfPtr(1)%p)
+ nullify (arrayOfPtr(2)%p)
+ nullify (arrayOfPtr(3)%p)
logp => logv ! Before pointer assignment
comp => comv
@@ -53,8 +64,10 @@ program pointers
charap => chara
intp => intv
intap => inta
+ intvlap => intvla
realp => realv
twop => twov
+ arrayOfPtr(2)%p => twov
logv = associated(logp) ! Before value assignment
comv = cmplx(1,2)
@@ -63,6 +76,10 @@ program pointers
intv = 10
inta(:,:) = 1
inta(3,1) = 3
+ allocate (intvla(10))
+ intvla(:) = 2
+ intvla(4) = 4
+ intvlap => intvla
realv = 3.14
allocate (twov%ivla1(3))
diff --git a/gdb/valops.c b/gdb/valops.c
index a34e74b2be..90dc2fec0c 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -1558,6 +1558,19 @@ 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. */
@@ -1573,8 +1586,7 @@ value_ind (struct value *arg1)
else
/* Retrieve the enclosing object pointed to. */
arg2 = value_at_lazy (enc_type,
- (value_as_address (arg1)
- - value_pointed_to_offset (arg1)));
+ (addr - value_pointed_to_offset (arg1)));
enc_type = value_type (arg2);
return readjust_indirect_value_type (arg2, enc_type, base_type, arg1);
diff --git a/gdb/valprint.c b/gdb/valprint.c
index b2236f8931..35f22b6d43 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -1108,12 +1108,6 @@ value_check_printable (struct value *val, struct ui_file *stream,
return 0;
}
- if (type_not_associated (value_type (val)))
- {
- val_print_not_associated (stream);
- return 0;
- }
-
if (type_not_allocated (value_type (val)))
{
val_print_not_allocated (stream);
--
2.17.1