| Age | Commit message (Collapse) | Author | Files | Lines |
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Idea of this patch is to get a clean and simple public interface for
the dwarf_expr_context class, looking like:
- constructor,
- destructor,
- push_address method and
- evaluate method.
Where constructor should only ever require a target architecture
information. This information is held in per object file
(dwarf2_per_objfile) structure, so it makes sense to keep that
structure as a constructor argument. It also makes sense to get the
address size from that structure, but unfortunately that interface
doesn't exist at the moment, so the dwarf_expr_context class user
needs to provide that information.
The push_address method is used to push a CORE_ADDR as a value on
top of the DWARF stack before the evaluation. This method can be
later changed to push any struct value object on the stack.
The evaluate method is the method that evaluates a DWARF expression
and provides the evaluation result, in a form of a single struct
value object that describes a location. To do this, the method requires
a context of the evaluation, as well as expected result type
information. If the type information is not provided, the DWARF generic
type will be used instead.
To avoid storing the gdbarch information in the evaluator object, that
information is now always acquired from the per_objfile object.
All data members are now private and only visible to the evaluator
class, so a m_ prefix was added to all of their names to reflect that.
To make this distinction clear, they are also accessed through objects
this pointer, wherever that was not the case before.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::dwarf_expr_context): Add
address size argument.
(dwarf_expr_context::read_mem): Change to use property_addr_info
structure.
(dwarf_expr_context::evaluate): New function.
(dwarf_expr_context::execute_stack_op): Change to use
property_addr_info structure.
* dwarf2/expr.h (struct dwarf_expr_context): New evaluate
declaration. Change eval and fetch_result method to private.
(dwarf_expr_context::gdbarch): Remove member.
(dwarf_expr_context::stack): Make private and add m_ prefix.
(dwarf_expr_context::addr_size): Make private and add
m_ prefix.
(dwarf_expr_context::recursion_depth): Make private and add
m_ prefix.
(dwarf_expr_context::max_recursion_depth): Make private and
add m_ prefix.
(dwarf_expr_context::len): Make private and add m_ prefix.
(dwarf_expr_context::data): Make private and add m_ prefix.
(dwarf_expr_context::initialized): Make private and add
m_ prefix.
(dwarf_expr_context::pieces): Make private and add m_ prefix.
(dwarf_expr_context::per_objfile): Make private and add
m_ prefix.
(dwarf_expr_context::frame): Make private and add m_ prefix.
(dwarf_expr_context::per_cu): Make private and add m_ prefix.
(dwarf_expr_context::addr_info): Make private and add
m_ prefix.
* dwarf2/frame.c (execute_stack_op): Change to call evaluate
method.
* dwarf2/loc.c (dwarf2_evaluate_loc_desc_full): Change to call
evaluate method.
(dwarf2_locexpr_baton_eval): Change to call evaluate method.
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The patch is addressing the issue of class users writing and reading
the internal data of the dwarf_expr_context class.
At this point, all conditions are met for the DWARF evaluator to return
an evaluation result in a form of a single struct value object.
gdb/ChangeLog:
* dwarf2/expr.c (pieced_value_funcs): Chenge to static
function.
(allocate_piece_closure): Change to static function.
(dwarf_expr_context::fetch_result): New function.
* dwarf2/expr.h (struct piece_closure): Remove declaration.
(struct dwarf_expr_context): fetch_result new declaration.
fetch, fetch_address and fetch_in_stack_memory members move
to private.
(allocate_piece_closure): Remove.
* dwarf2/frame.c (execute_stack_op): Change to use
fetch_result.
* dwarf2/loc.c (dwarf2_evaluate_loc_desc_full): Change to use
fetch_result.
(dwarf2_locexpr_baton_eval): Change to use fetch_result.
* dwarf2/loc.h (invalid_synthetic_pointer): Expose function.
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Fixing a bug where the value_copy function did not copy the stack data
and initialized members of the struct value. This is needed for the
next patch where the DWARF expression evaluator is changed to return a
single struct value object.
* value.c (value_copy): Change to also copy the stack data
and initialized members.
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Following 5 patches series is trying to clean up the interface of the
DWARF expression evaluator class (dwarf_expr_context).
After merging all expression evaluators into one class, the next
logical step is to make a clean user interface for that class. To do
that, we first need to address the issue of class users writing and
reading the internal data of the class directly.
Fixing the case of writing is simple, it makes sense for an evaluator
instance to be per architecture basis. Currently, the best separation
seems to be per object file, so having that data (dwarf2_per_objfile)
as a constructor argument makes sense. It also makes sense to get the
address size from that object file, but unfortunately that interface
does not exist at the moment.
Luckily, address size information is already available to the users
through other means. As a result, the address size also needs to be a
class constructor argument, at least until a better interface for
acquiring that information from an object file is implemented.
The rest of the user written data comes down to a context of an
evaluated expression (compilation unit context, frame context and
passed in buffer context) and a source type information that a result
of evaluating expression is representing. So, it makes sense for all of
these to be arguments of an evaluation method.
To address the problem of reading the dwarf_expr_context class
internal data, we first need to understand why it is implemented that
way?
This is actualy a question of which existing class can be used to
represent both values and a location descriptions and why it is not
used currently?
The answer is in a struct value class/structure, but the problem is
that before the evaluators were merged, only one evaluator had an
infrastructure to resolve composite and implicit pointer location
descriptions.
After the merge, we are now able to use the struct value to represent
any result of the expression evaluation. It also makes sense to move
all infrastructure for those location descriptions to the expr.c file
considering that that is the only place using that infrastructure.
What we are left with in the end is a clean public interface of the
dwarf_expr_context class containing:
- constructor,
- destructor,
- push_address method and
- eval_exp method.
The idea with this particular patch is to move piece_closure structure
and the interface that handles it (lval_funcs) to expr.c file.
While implicit pointer location descriptions are still not useful in
the CFI context (of the AMD's DWARF standard extensions), the composite
location descriptions are certainly necessary to describe a results of
specific compiler optimizations.
Considering that a piece_closure structure is used to represent both,
there was no benefit in splitting them.
gdb/ChangeLog:
* dwarf2/expr.c (struct piece_closure): Add from loc.c.
(allocate_piece_closure): Add from loc.c.
(bits_to_bytes): Add from loc.c.
(rw_pieced_value): Add from loc.c.
(read_pieced_value): Add from loc.c.
(write_pieced_value): Add from loc.c.
(check_pieced_synthetic_pointer): Add from loc.c.
(indirect_pieced_value): Add from loc.c.
(coerce_pieced_ref): Add from loc.c.
(copy_pieced_value_closure): Add from loc.c.
(free_pieced_value_closure): Add from loc.c.
(sect_variable_value): Add from loc.c.
* dwarf2/loc.c (sect_variable_value): Move to expr.c.
(struct piece_closure): Move to expr.c.
(allocate_piece_closure): Move to expr.c.
(bits_to_bytes): Move to expr.c.
(rw_pieced_value): Move to expr.c.
(read_pieced_value): Move to expr.c.
(write_pieced_value): Move to expr.c.
(check_pieced_synthetic_pointer): Move to expr.c.
(indirect_pieced_value): Move to expr.c.
(coerce_pieced_ref): Move to expr.c.
(copy_pieced_value_closure): Move to expr.c.
(free_pieced_value_closure): Move to expr.c.
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The evaluate_for_locexpr_baton is the last derived class from the
dwarf_expr_context class. It's purpose is to support the passed in
buffer functionality.
Although, it is not really necessary to merge this class with it's
base class, doing that simplifies new expression evaluator design.
Considering that this functionality is going around the DWARF standard,
it is also reasonable to expect that with a new evaluator design and
extending the push object address functionality to accept any location
description, there will be no need to support passed in buffers.
Alternatively, it would also makes sense to abstract the interaction
between the evaluator and a given resource in the near future. The
passed in buffer would then be a specialization of that abstraction.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::read_mem): Merge with
evaluate_for_locexpr_baton implementation.
* dwarf2/loc.c (class evaluate_for_locexpr_baton): Remove
class.
(evaluate_for_locexpr_baton::read_mem): Move to
dwarf_expr_context.
(dwarf2_locexpr_baton_eval): Instantiate dwarf_expr_context
instead of evaluate_for_locexpr_baton class.
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There are no virtual methods that require different specialization in
dwarf_expr_context class. This means that derived classes
dwarf_expr_executor and dwarf_evaluate_loc_desc are not needed any
more.
As a result of this, the evaluate_for_locexpr_baton class base class
is now the dwarf_expr_context class.
There might be a need for a better class hierarchy when we know more
about the direction of the future DWARF versions and gdb extensions,
but that is out of the scope of this patch series.
gdb/ChangeLog:
* dwarf2/frame.c (class dwarf_expr_executor): Remove class.
(execute_stack_op): Instantiate dwarf_expr_context instead of
dwarf_evaluate_loc_desc class.
* dwarf2/loc.c (class dwarf_evaluate_loc_desc): Remove class.
(dwarf2_evaluate_loc_desc_full): Instantiate dwarf_expr_context
instead of dwarf_evaluate_loc_desc class.
(struct evaluate_for_locexpr_baton): Derive from
dwarf_expr_context.
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The get_reg_value method is a small function that is only called once,
so it can be inlined to simplify the dwarf_expr_context class.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::get_reg_value): Remove
method.
(dwarf_expr_context::execute_stack_op): Inline get_reg_value
method.
* dwarf2/expr.h (dwarf_expr_context::get_reg_value): Remove
method.
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Following the idea of merging the evaluators, the
push_dwarf_reg_entry_value method can be moved from
dwarf_expr_executor and dwarf_evaluate_loc_desc classes
to their base class dwarf_expr_context.
gdb/ChangeLog:
* dwarf2/expr.c
(dwarf_expr_context::push_dwarf_reg_entry_value): Move from
dwarf_evaluate_loc_desc.
* dwarf2/frame.c
(dwarf_expr_executor::push_dwarf_reg_entry_value): Remove
method.
* dwarf2/loc.c (dwarf_expr_reg_to_entry_parameter): Expose
function.
(dwarf_evaluate_loc_desc::push_dwarf_reg_entry_value): Move to
dwarf_expr_context.
* dwarf2/loc.h (dwarf_expr_reg_to_entry_parameter): Expose
function.
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Following the idea of merging the evaluators, the read_mem method can
be moved from dwarf_expr_executor and dwarf_evaluate_loc_desc classes
to their base class dwarf_expr_context.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::read_mem): Move from
dwarf_evaluate_loc_desc.
* dwarf2/frame.c (dwarf_expr_executor::read_mem): Remove
method.
* dwarf2/loc.c (dwarf_evaluate_loc_desc::read_mem): Move to
dwarf_expr_context.
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Following the idea of merging the evaluators, the get_object_address
and can be moved from dwarf_expr_executor and dwarf_evaluate_loc_desc
classes to their base class dwarf_expr_context.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::get_object_address): Move
from dwarf_evaluate_loc_desc.
(class dwarf_expr_context): Add object address member to
dwarf_expr_context.
* dwarf2/expr.h (dwarf_expr_context::get_frame_pc): Remove
method.
* dwarf2/frame.c (dwarf_expr_executor::get_object_address):
Remove method.
* dwarf2/loc.c (dwarf_evaluate_loc_desc::get_object_address):
move to dwarf_expr_context.
(class dwarf_evaluate_loc_desc): Move object address member to
dwarf_expr_context.
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Following the idea of merging the evaluators, the dwarf_call and
get_frame_pc method can be moved from dwarf_expr_executor and
dwarf_evaluate_loc_desc classes to their base class dwarf_expr_context.
Once this is done, the get_frame_pc can be replace with lambda
function.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::dwarf_call): Move from
dwarf_evaluate_loc_desc.
(dwarf_expr_context::get_frame_pc): Replace with lambda.
* dwarf2/expr.h (dwarf_expr_context::get_frame_pc): Remove
method.
* dwarf2/frame.c (dwarf_expr_executor::dwarf_call): Remove
method.
(dwarf_expr_executor::get_frame_pc): Remove method.
* dwarf2/loc.c (dwarf_evaluate_loc_desc::get_frame_pc): Remove
method.
(dwarf_evaluate_loc_desc::dwarf_call): Move to
dwarf_expr_context.
(per_cu_dwarf_call): Inline function.
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This patch moves the compilation unit context information and support
from dwarf_expr_executor and dwarf_evaluate_loc_desc to
dwarf_expr_context evaluator. The idea is to report an error when a
given operation requires a compilation unit information to be resolved,
which is not available.
With this change, it also makes sense to always acquire ref_addr_size
information from the compilation unit context, considering that all
DWARF operations that refer to that information require a compilation
unit context to be present during their evaluation.
gdb/ChangeLog:
* dwarf2/expr.c (ensure_have_per_cu): New function.
(dwarf_expr_context::dwarf_expr_context): Add compilation unit
context information.
(dwarf_expr_context::get_base_type): Move from
dwarf_evaluate_loc_desc.
(dwarf_expr_context::get_addr_index): Remove method.
(dwarf_expr_context::dwarf_variable_value): Remove method.
(dwarf_expr_context::execute_stack_op): Call compilation unit
context info check. Inline get_addr_index and
dwarf_variable_value methods.
* dwarf2/expr.h (struct dwarf_expr_context): Add compilation
context info.
(dwarf_expr_context::get_addr_index): Remove method.
(dwarf_expr_context::dwarf_variable_value): Remove method.
(dwarf_expr_context::ref_addr_size): Remove member.
* dwarf2/frame.c (dwarf_expr_executor::get_addr_index): Remove
method.
(dwarf_expr_executor::dwarf_variable_value): Remove method.
* dwarf2/loc.c (sect_variable_value): Expose function.
(dwarf_evaluate_loc_desc::get_addr_index): Remove method.
(dwarf_evaluate_loc_desc::dwarf_variable_value): Remove method.
(class dwarf_evaluate_loc_desc): Move compilation unit context
information to dwarf_expr_context class.
* dwarf2/loc.h (sect_variable_value): Expose function.
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Following the idea of merging the evaluators, the get_frame_cfa method
can be moved from dwarf_expr_executor and dwarf_evaluate_loc_desc
classes to their base class dwarf_expr_context. Once this is done,
it becomes apparent that the method is only called once and it can be
inlined.
It is also necessary to check if the frame context information was
provided before the DW_OP_call_frame_cfa operation is executed.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::get_frame_cfa): Remove
method.
(dwarf_expr_context::execute_stack_op): Call frame context info
check for DW_OP_call_frame_cfa. Remove use of get_frame_cfa.
* dwarf2/expr.h (dwarf_expr_context::get_frame_cfa): Remove
method.
* dwarf2/frame.c (dwarf_expr_context::get_frame_cfa): Remove
method.
* dwarf2/loc.c (dwarf_expr_context::get_frame_cfa): Remove
method.
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Following 15 patches in this patch series is cleaning up the design of
the DWARF expression evaluator (dwarf_expr_context) to make future
extensions of that evaluator easier and cleaner to implement.
There are three subclasses of the dwarf_expr_context class
(dwarf_expr_executor, dwarf_evaluate_loc_desc and
evaluate_for_locexpr_baton). Here is a short description of each class:
- dwarf_expr_executor is evaluating a DWARF expression in a context
of a Call Frame Information. The overridden methods of this subclass
report an error if a specific DWARF operation, represented by that
method, is not allowed in a CFI context. The source code of this
subclass lacks the support for composite as well as implicit pointer
location description.
- dwarf_evaluate_loc_desc can evaluate any expression with no
restrictions. All of the methods that this subclass overrides are
actually doing what they are intended to do. This subclass contains
a full support for all location description types.
- evaluate_for_locexpr_baton subclass is a specialization of the
dwarf_evaluate_loc_desc subclass and it's function is to add
support for passed in buffers. This seems to be a way to go around
the fact that DWARF standard lacks a bit offset support for memory
location descriptions as well as using any location description for
the push object address functionality.
It all comes down to this question: what is a function of a DWARF
expression evaluator?
Is it to evaluate the expression in a given context or to check the
correctness of that expression in that context?
Currently, the only reason why there is a dwarf_expr_executor subclass
is to report an invalid DWARF expression in a context of a CFI, but is
that what the evaluator is supposed to do considering that the evaluator
is not tied to a given DWARF version?
There are more and more vendor and GNU extensions that are not part of
the DWARF standard, so is it that impossible to expect that some of the
extensions could actually lift the previously imposed restrictions of
the CFI context? Not to mention that every new DWARF version is lifting
some restrictions anyway.
The thing that makes more sense for an evaluator to do, is to take the
context of an evaluation and checks the requirements of every operation
evaluated against that context. With this approach, the evaluator would
report an error only if parts of the context, necessary for the
evaluation, are missing.
If this approach is taken, then the unification of the
dwarf_evaluate_loc_desc, dwarf_expr_executor and dwarf_expr_context
is the next logical step. This makes a design of the DWARF expression
evaluator cleaner and allows more flexibility when supporting future
vendor and GNU extensions.
Additional benefit here is that now all evaluators have access to all
location description types, which means that a vendor extended CFI
rules could support composite location description as well. This also
means that a new evaluator interface can be changed to return a single
struct value (that describes the result of the evaluation) instead of
a caller poking around the dwarf_expr_context internal data for answers
(like it is done currently).
This patch starts the merging process by moving the frame context
information and support from dwarf_expr_executor and
dwarf_evaluate_loc_desc to dwarf_expr_context evaluator. The idea
is to report an error when a given operation requires a frame
information to be resolved, if that information is not present.
gdb/ChangeLog:
* dwarf2/expr.c (ensure_have_frame): New function.
(read_addr_from_reg): Add from frame.c.
(dwarf_expr_context::dwarf_expr_context): Add frame info to
dwarf_expr_context.
(dwarf_expr_context::read_addr_from_reg): Remove.
(dwarf_expr_context::get_reg_value): Move from
dwarf_evaluate_loc_desc.
(dwarf_expr_context::get_frame_base): Move from
dwarf_evaluate_loc_desc.
(dwarf_expr_context::execute_stack_op): Call frame context info
check. Remove use of read_addr_from_reg method.
* dwarf2/expr.h (struct dwarf_expr_context): Add frame info
member, read_addr_from_reg, get_reg_value and get_frame_base
declaration.
(read_addr_from_reg): Move to expr.c.
* dwarf2/frame.c (read_addr_from_reg): Move to
dwarf_expr_context.
(dwarf_expr_executor::read_addr_from_reg): Remove.
(dwarf_expr_executor::get_frame_base): Remove.
(dwarf_expr_executor::get_reg_value): Remove.
(execute_stack_op): Use read_addr_from_reg function instead of
read_addr_from_reg method.
* dwarf2/loc.c (dwarf_evaluate_loc_desc::get_frame_base): Move
to dwarf_expr_context.
(dwarf_evaluate_loc_desc::get_reg_value): Move to
dwarf_expr_context.
(dwarf_evaluate_loc_desc::read_addr_from_reg): Remove.
(dwarf2_locexpr_baton_eval):Use read_addr_from_reg function
instead of read_addr_from_reg method.
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Move the initial values for dwarf_expr_context class data members
to the class declaration in expr.h.
gdb/ChangeLog:
* dwarf2/expr.c (dwarf_expr_context::dwarf_expr_context):
Remove initial data members values.
* dwarf2/expr.h (dwarf_expr_context): Add initial values
to the class data members.
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This patch addresses a design problem with the symbol_needs_eval_context
class. It exposes the problem by introducing two new testsuite test
cases.
To explain the issue, I first need to explain the dwarf_expr_context
class that the symbol_needs_eval_context class derives from.
The intention behind the dwarf_expr_context class is to commonize the
DWARF expression evaluation mechanism for different evaluation
contexts. Currently in gdb, the evaluation context can contain some or
all of the following information: architecture, object file, frame and
compilation unit.
Depending on the information needed to evaluate a given expression,
there are currently three distinct DWARF expression evaluators:
- Frame: designed to evaluate an expression in the context of a call
frame information (dwarf_expr_executor class). This evaluator doesn't
need a compilation unit information.
- Location description: designed to evaluate an expression in the
context of a source level information (dwarf_evaluate_loc_desc
class). This evaluator expects all information needed for the
evaluation of the given expression to be present.
- Symbol needs: designed to answer a question about the parts of the
context information required to evaluate a DWARF expression behind a
given symbol (symbol_needs_eval_context class). This evaluator
doesn't need a frame information.
The functional difference between the symbol needs evaluator and the
others is that this evaluator is not meant to interact with the actual
target. Instead, it is supposed to check which parts of the context
information are needed for the given DWARF expression to be evaluated by
the location description evaluator.
The idea is to take advantage of the existing dwarf_expr_context
evaluation mechanism and to fake all required interactions with the
actual target, by returning back dummy values. The evaluation result is
returned as one of three possible values, based on operations found in a
given expression:
- SYMBOL_NEEDS_NONE,
- SYMBOL_NEEDS_REGISTERS and
- SYMBOL_NEEDS_FRAME.
The problem here is that faking results of target interactions can yield
an incorrect evaluation result.
For example, if we have a conditional DWARF expression, where the
condition depends on a value read from an actual target, and the true
branch of the condition requires a frame information to be evaluated,
while the false branch doesn't, fake target reads could conclude that a
frame information is not needed, where in fact it is. This wrong
information would then cause the expression to be actually evaluated (by
the location description evaluator) with a missing frame information.
This would then crash the debugger.
The gdb.dwarf2/symbol_needs_eval_fail.exp test introduces this
scenario, with the following DWARF expression:
DW_OP_addr $some_variable
DW_OP_deref
# conditional jump to DW_OP_bregx
DW_OP_bra 4
DW_OP_lit0
# jump to DW_OP_stack_value
DW_OP_skip 3
DW_OP_bregx $dwarf_regnum 0
DW_OP_stack_value
This expression describes a case where some variable dictates the
location of another variable. Depending on a value of some_variable, the
variable whose location is described by this expression is either read
from a register or it is defined as a constant value 0. In both cases,
the value will be returned as an implicit location description on the
DWARF stack.
Currently, when the symbol needs evaluator fakes a memory read from the
address behind the some_variable variable, the constant value 0 is used
as the value of the variable A, and the check returns the
SYMBOL_NEEDS_NONE result.
This is clearly a wrong result and it causes the debugger to crash.
The scenario might sound strange to some people, but it comes from a
SIMD/SIMT architecture where $some_variable is an execution mask. In
any case, it is a valid DWARF expression, and GDB shouldn't crash while
evaluating it. Also, a similar example could be made based on a
condition of the frame base value, where if that value is concluded to
be 0, the variable location could be defaulted to a TLS based memory
address.
The gdb.dwarf2/symbol_needs_eval_timeout.exp test introduces a second
scenario. This scenario is a bit more abstract due to the DWARF
assembler lacking the CFI support, but it exposes a different
manifestation of the same problem. Like in the previous scenario, the
DWARF expression used in the test is valid:
DW_OP_lit1
DW_OP_addr $some_variable
DW_OP_deref
# jump to DW_OP_fbreg
DW_OP_skip 4
DW_OP_drop
DW_OP_fbreg 0
DW_OP_dup
DW_OP_lit0
DW_OP_eq
# conditional jump to DW_OP_drop
DW_OP_bra -9
DW_OP_stack_value
Similarly to the previous scenario, the location of a variable A is an
implicit location description with a constant value that depends on a
value held by a global variable. The difference from the previous case
is that DWARF expression contains a loop instead of just one branch. The
end condition of that loop depends on the expectation that a frame base
value is never zero. Currently, the act of faking the target reads will
cause the symbol needs evaluator to get stuck in an infinite loop.
Somebody could argue that we could change the fake reads to return
something else, but that would only hide the real problem.
The general impression seems to be that the desired design is to have
one class that deals with parsing of the DWARF expression, while there
are virtual methods that deal with specifics of some operations.
Using an evaluator mechanism here doesn't seem to be correct, because
the act of evaluation relies on accessing the data from the actual
target with the possibility of skipping the evaluation of some parts of
the expression.
To better explain the proposed solution for the issue, I first need to
explain a couple more details behind the current design:
There are multiple places in gdb that handle DWARF expression parsing
for different purposes. Some are in charge of converting the expression
to some other internal representation (decode_location_expression,
disassemble_dwarf_expression and dwarf2_compile_expr_to_ax), some are
analysing the expression for specific information
(compute_stack_depth_worker) and some are in charge of evaluating the
expression in a given context (dwarf_expr_context::execute_stack_op
and decode_locdesc).
The problem is that all those functions have a similar (large) switch
statement that handles each DWARF expression operation. The result of
this is a code duplication and harder maintenance.
As a step into the right direction to solve this problem (at least for
the purpose of a DWARF expression evaluation) the expression parsing was
commonized inside of an evaluator base class (dwarf_expr_context). This
makes sense for all derived classes, except for the symbol needs
evaluator (symbol_needs_eval_context) class.
As described previously the problem with this evaluator is that if the
evaluator is not allowed to access the actual target, it is not really
evaluating.
Instead, the desired function of a symbol needs evaluator seems to fall
more into expression analysis category. This means that a more natural
fit for this evaluator is to be a symbol needs analysis, similar to the
existing compute_stack_depth_worker analysis.
Another problem is that using a heavyweight mechanism of an evaluator
to do an expression analysis seems to be an unneeded overhead. It also
requires a more complicated design of the parent class to support fake
target reads.
The reality is that the whole symbol_needs_eval_context class can be
replaced with a lightweight recursive analysis function, that will give
more correct result without compromising the design of the
dwarf_expr_context class. The analysis treats the expression byte
stream as a DWARF operation graph, where each graph node can be
visited only once and each operation can decide if the frame context
is needed for their evaluation.
The downside of this approach is adding of one more similar switch
statement, but at least this way the new symbol needs analysis will be
a lightweight mechnism and it will provide a correct result for any
given DWARF expression.
A more desired long term design would be to have one class that deals
with parsing of the DWARF expression, while there would be a virtual
methods that deal with specifics of some DWARF operations. Then that
class would be used as a base for all DWARF expression parsing mentioned
at the beginning.
This however, requires a far bigger changes that are out of the scope
of this patch series.
The new analysis requires the DWARF location description for the
argc argument of the main function to change in the assembly file
gdb.python/amd64-py-framefilter-invalidarg.S. Originally, expression
ended with a 0 value byte, which was never reached by the symbol needs
evaluator, because it was detecting a stack underflow when evaluating
the operation before. The new approach does not simulate a DWARF
stack anymore, so the 0 value byte needs to be removed because it
makes the DWARF expression invalid.
gdb/ChangeLog:
* dwarf2/loc.c (class symbol_needs_eval_context): Remove.
(dwarf2_get_symbol_read_needs): New function.
(dwarf2_loc_desc_get_symbol_read_needs): Remove.
(locexpr_get_symbol_read_needs): Use
dwarf2_get_symbol_read_needs.
gdb/testsuite/ChangeLog:
* gdb.python/amd64-py-framefilter-invalidarg.S : Update argc
DWARF location expression.
* lib/dwarf.exp (_location): Handle DW_OP_fbreg.
* gdb.dwarf2/symbol_needs_eval.c: New file.
* gdb.dwarf2/symbol_needs_eval_fail.exp: New file.
* gdb.dwarf2/symbol_needs_eval_timeout.exp: New file.
|
|
I was looking at PR gdb/19675 and the related test
gdb.base/step-over-syscall.exp. This test includes a call to kfail
when we are testing a displaced step over a clone syscall.
While looking at the test I removed the call to kfail and ran the
test, and was surprised that the test passed.
I ran the test a few times and it does sometimes fail, but mostly it
passed fine.
PR gdb/19675 describes how, when we displaced step over a clone, the
new thread is created with a $pc in the displaced step buffer. GDB
then fails to "fix" this $pc (for the new thread), and the thread will
be set running with its current $pc value. This means that the new
thread will just start executing from whatever happens to be after the
displaced stepping buffer.
In the original PR gdb/19675 bug report Yao Qi was seeing the new
thread cause a segfault, the problem is, what actually happens is
totally undefined.
On my machine, I'm seeing the new thread reenter main, it then starts
trying to run the test again (in the new thread). This just happens
to be safe enough (in this simple test) that most of the time the
inferior doesn't crash.
In this commit I try to make the test slightly more likely to fail by
doing a couple of things.
First, I added a static variable to main, this is set true when the
first thread enters main, if a second thread ever enters main then I
force an abort.
Second, when the test is finishing I want to ensure that the new
threads have had a chance to do "something bad" if they are going to.
So I added a global counter, as each thread starts successfully it
decrements the counter. The main thread does not proceed to the final
marker function (where GDB has placed a breakpoint) until all threads
have started successfully. This means that if the newly created
thread doesn't successfully enter clone_fn then the counter will never
reach zero and the test will timeout.
With these two changes my hope is that the test should fail more
reliably, and so, I have also changed the test to call setup_kfail
before the specific steps that we expect to misbehave instead of just
calling kfail and skipping parts of the test completely. The benefit
of this is that if/when we fix GDB this test will start to KPASS and
we'll know to update this test to remove the setup_kfail call.
|
|
While working on a stack unwinding issue using 'set debug frame on', I
noticed the frame_info::to_string method could be slightly improved.
Unwinders have been given a name in
a154d838a70e96d888620c072e2d6ea8bdf044ca. Before this patch, frame_info
debug output prints the host address of the used unwinder, which is not
easy to interpret. This patch proposes to use the unwinder name
instead since we now have it.
Before the patch:
{level=1,type=NORMAL_FRAME,unwind=0x2ac1763ec0,pc=0x3ff7fc3460,id={stack=0x3ff7ea79b0,code=0x0000003ff7fc33ac,!special},func=0x3ff7fc33ac}
With the patch:
{level=1,type=NORMAL_FRAME,unwinder="riscv prologue",pc=0x3ff7fc3460,id={stack=0x3ff7ea79b0,code=0x0000003ff7fc33ac,!special},func=0x3ff7fc33ac}
Tested on riscv64-linux-gnu.
|
|
The test gdb.base/info-macros.exp says that it doesn't pass the "debug"
option to prepare_for_testing because that would cause -g to appear
after -g3 on the command line, and that would cause some gcc versions to
not include macro info. I don't know what gcc versions this refers to.
I tested with gcc 4.8, and that works fine with -g after -g3.
The current state is problematic when testing with CC_FOR_TARGET=clang,
because then only -fdebug-macro is included. No -g switch if included,
meaning we get a binary without any debug info, and the test fails.
One way to fix it would be to add "debug" to the options when the
compiler is clang.
However, the solution I chose was to specify "debug" in any case, even
for gcc. Other macro tests such as gdb.base/macscp.exp do perfectly
fine with it. Also, this lets the test use the debug flag specified by
the board file. For example, we can test with GCC and DWARF 5, with:
$ make check RUNTESTFLAGS="--target_board unix/gdb:debug_flags=-gdwarf-5" TESTS="gdb.base/info-macros.exp"
With the hard-coded -g3, this wouldn't actually test with DWARF 5.
Change-Id: I33fa92ee545007d3ae9c52c4bb2d5be6b5b698f1
|
|
Since 4d7188abfdf2 ("gdbsupport: add debug assertions in
gdb::optional::get"), some macro-related tests fail on Ubuntu 20.04 with
the system gcc 9.3.0 compiler when building with _GLIBCXX_DEBUG. For
example, gdb.base/info-macros.exp results in:
(gdb) break -qualified main
/home/smarchi/src/binutils-gdb/gdb/../gdbsupport/gdb_optional.h:206: internal-error: T& gdb::optional<T>::get() [with T = long unsigned int]: Assertion `this->has_value ()' failed.
The binary contains DWARF 4 debug info and includes a pre-standard
(pre-DWARF 5) .debug_macro section. The CU doesn't have a
DW_AT_str_offsets_base attribute (which doesn't exist in DWARF 4). The
field dwarf2_cu::str_offsets_base is therefore empty. At
dwarf2/read.c:24138, we unconditionally read the value in the optional,
which triggers the assertion shown above.
The same thing happens when building the test program with DWARF 5 with
the same gcc compiler, as that version of gcc doesn't use indirect
string forms, even with DWARF 5. So it still doesn't add a
DW_AT_str_offsets_base attribute on the CU.
Fix that by propagating down a gdb::optional<ULONGEST> for the str
offsets base instead of ULONGEST. That value is only used in
dwarf_decode_macro_bytes, when encountering an "strx" macro operation
(DW_MACRO_define_strx or DW_MACRO_undef_strx). Add a check there that
we indeed have a value in the optional before reading it. This is
unlikely to happen, but could happen in theory with an erroneous file
that uses DW_MACRO_define_strx but does not provide a
DW_AT_str_offsets_base (in practice, some things would probably have
failed before and stopped processing of debug info). I tested the
complaint by inverting the condition and using a clang-compiled binary,
which uses the strx operators. This is the result:
During symbol reading: use of DW_MACRO_define_strx with unknown string offsets base [in module /home/simark/build/binutils-gdb/gdb/testsuite/outputs/gdb.base/info-macros/info-macros]
The test now passes cleanly with the setup mentioned above, and the
testsuite looks on par with how it was before 4d7188abfdf2.
Change-Id: I7ebd2724beb7b9b4178872374c2a177aea696e77
|
|
I saw this complaint when my code had some bug, and spotted the typo.
Fix it, and while at it mention DW_MACRO as well (it would be confusing
to only see DW_MACINFO with a file that uses a DWARF 5 .debug_macro
section). I contemplated the idea of passing the knowledge of whether
we are dealing with a .debug_macro section or .debug_macinfo section, to
print only the right one. But in the end, I don't think that trouble is
necessary for a complaint nobody is going to see.
Change-Id: I276ce8da65c3eac5304f64a1e246358ed29cdbbc
|
|
Building on OpenBSD, I get warnings like:
CXX bsd-kvm.o
/home/simark/src/binutils-gdb/gdb/bsd-kvm.c:241:18: error: ISO C++11 does not allow conversion from string literal to 'char *' [-Werror,-Wwritable-strings]
nl[0].n_name = "_dumppcb";
^
Silence those by adding casts.
Change-Id: I2bef4eebcc306762a4e3e5b5c52f67ecf2820503
|
|
Use a lambda function instead of addrmap_foreach_check,
which removes the need for static variables.
Also remove unnecessary static on local var temp_obstack in test_addrmap.
gdb/ChangeLog:
2021-08-04 Tom de Vries <tdevries@suse.de>
* addrmap.c (addrmap_foreach_check): Remove.
(array, val1, val2): Move ...
(test_addrmap): ... here. Remove static on temp_obstack. Use lambda
function instead of addrmap_foreach_check.
|
|
Currently addrmap_mutable_find is not implemented:
...
static void *
addrmap_mutable_find (struct addrmap *self, CORE_ADDR addr)
{
/* Not needed yet. */
internal_error (__FILE__, __LINE__,
_("addrmap_find is not implemented yet "
"for mutable addrmaps"));
}
...
I implemented this because I needed it during debugging, to be able to do:
...
(gdb) p ((dwarf2_psymtab *)addrmap_find (map, addr))->filename
...
before and after a call to addrmap_set_empty.
Since this is not used otherwise, added addrmap unit test.
Build on x86_64-linux, tested by doing:
...
$ gdb -q -batch -ex "maint selftest addrmap"
Running selftest addrmap.
Ran 1 unit tests, 0 failed
...
gdb/ChangeLog:
2021-08-03 Tom de Vries <tdevries@suse.de>
* gdb/addrmap.c (addrmap_mutable_find): Implement
[GDB_SELF_TESTS] (CHECK_ADDRMAP_FIND): New macro.
[GDB_SELF_TESTS] (core_addr, addrmap_foreach_check, test_addrmap)
(_initialize_addrmap): New function.
|
|
In the context of ROCm-gdb [1], the ROCm target sits on top of the
linux-nat target. when a process forks, it needs to carry over some
data from the forking inferior to the fork child inferior. Ideally, the
ROCm target would implement the follow_fork target_ops method, but there
are some small problems. This patch fixes these, which helps the ROCm
target, but also makes things more consistent and a bit nicer in
general, I believe.
The main problem is: when follow-fork-mode is "parent",
target_follow_fork is called with the parent as the current inferior.
When it's "child", target_follow_fork is called with the child as the
current inferior. This means that target_follow_fork is sometimes
called on the parent's target stack and sometimes on the child's target
stack.
The parent's target stack may contain targets above the process target,
such as the ROCm target. So if follow-fork-child is "parent", the ROCm
target would get notified of the fork and do whatever is needed. But
the child's target stack, at that moment, only contains the exec and
process target copied over from the parent. The child's target stack is
set up by follow_fork_inferior, before calling target_follow_fork. In
that case, the ROCm target wouldn't get notified of the fork.
For consistency, I think it would be good to always call
target_follow_fork on the parent inferior's target stack. I think it
makes sense as a way to indicate "this inferior has called fork, do
whatever is needed". The desired outcome of the fork (whether an
inferior is created for the child, do we need to detach from the child)
can be indicated by passed parameter.
I therefore propose these changes:
- make follow_fork_inferior always call target_follow_fork with the
parent as the current inferior. That lets all targets present on the
parent's target stack do some fork-related handling and push
themselves on the fork child's target stack if needed.
For this purpose, pass the child inferior down to target_follow_fork
and follow_fork implementations. This is nullptr if no inferior is
created for the child, because we want to detach from it.
- as a result, in follow_fork_inferior, detach from the parent inferior
(if needed) only after the target_follow_fork call. This is needed
because we want to call target_follow_fork before the parent's
target stack is torn down.
- hand over to the targets in the parent's target stack (including the
process target) the responsibility to push themselves, if needed, to
the child's target stack. Also hand over the responsibility to the
process target, at the same time, to create the child's initial
thread (just like we do for follow_exec).
- pass the child inferior to exec_on_vfork, so we don't need to swap
the current inferior between parent and child. Nothing in
exec_on_vfork depends on the current inferior, after this change.
Although this could perhaps be replaced with just having the exec
target implement follow_fork and push itself in the child's target
stack, like the process target does... We would just need to make
sure the process target calls beneath()->follow_fork(...). I'm not
sure about this one.
gdb/ChangeLog:
* target.h (struct target_ops) <follow_fork>: Add inferior*
parameter.
(target_follow_fork): Likewise.
* target.c (default_follow_fork): Likewise.
(target_follow_fork): Likewise.
* fbsd-nat.h (class fbsd_nat_target) <follow_fork>: Likewise.
(fbsd_nat_target::follow_fork): Likewise, and call
inf_ptrace_target::follow_fork.
* linux-nat.h (class linux_nat_target) <follow_fork>: Likewise.
* linux-nat.c (linux_nat_target::follow_fork): Likewise, and
call inf_ptrace_target::follow_fork.
* obsd-nat.h (obsd_nat_target) <follow_fork>: Likewise.
* obsd-nat.c (obsd_nat_target::follow_fork): Likewise, and call
inf_ptrace_target::follow_fork.
* remote.c (class remote_target) <follow_fork>: Likewise.
(remote_target::follow_fork): Likewise, and call
process_stratum_target::follow_fork.
* process-stratum-target.h (class process_stratum_target)
<follow_fork>: New.
* process-stratum-target.c
(process_stratum_target::follow_fork): New.
* target-delegates.c: Re-generate.
[1] https://github.com/ROCm-Developer-Tools/ROCgdb
Change-Id: I460bd0af850f0485e8aed4b24c6d8262a4c69929
|
|
Output has additional information for a given filename.
gdb/testsuite/ChangeLog
* gdb.mi/mi-fortran-modules.exp (system_modules_pattern,
system_module_symbols_pattern): Add check for additional symbols
on the line
|
|
Please consider below testcase with intended error.
``````````
constexpr const char cstring[] = "Eta";
template <const char*, typename T> class Column {};
using quick = Column<cstring,double>; // cstring without '&'
void lookup() {
quick c1;
c1.ls();
}
``````````
It produces below error.
``````````
no member named 'ls' in 'Column<&cstring, double>'.
``````````
Please note that error message contains '&' for cstring, which is absent
in actual program.
Clang++ does not generate & in such cases and this should also be
accepted as correct output.
gdb/testsuite/ChangeLog:
* gdb.cp/templates.exp: Accept different but correct output
from the Clang++ compiled binary also.
|
|
The compiler may add a suffix to a mangled name. A typical example
would be splitting a function and creating a ".cold" variant.
This patch changes Ada decoding (aka demangling) to handle these
suffixes. It also changes the encoding process to handle them as
well.
A symbol like "function.cold" will now be displayed to the user as
"function[cold]". The "." is not simply preserved because that is
already used in Ada.
|
|
I believe that many calls to fprintf_symbol_filtered are incorrect.
In particular, there are some that pass a symbol's print name, like:
fprintf_symbol_filtered (gdb_stdout, sym->print_name (),
current_language->la_language, DMGL_ANSI);
fprintf_symbol_filtered uses the "demangle" global to decide whether
or not to demangle -- but print_name does this as well. This can lead
to double-demangling. Normally this could be innocuous, except I also
plan to change Ada demangling in a way that causes this to fail.
|
|
Pierre-Marie noticed that the Ada expression "TYPE'(NAME)" resolved
incorrectly when "TYPE" was an enumeration type. Here, "NAME" should
be unambiguous.
This patch fixes this problem. Note that the patch is not perfect --
it does not give an error if TYPE is an enumeration type but NAME is
not an enumerator but does have some other meaning in scope. Fixing
this proved difficult, and so I've left it out.
|
|
The type_qualifier global is no longer needed in the Ada expression
parser, so this removes it.
|
|
In Ada, an enumeration type can use a character literal as one of the
enumerators. The Ada expression parser handles the appropriate
conversion.
It turns out, though, that this conversion was handled incorrectly.
For an expression like TYPE'(EXP), the conversion would be done for
any such literal appearing in EXP -- but only the outermost such
expression should really be affected.
This patch defers the conversion until the resolution phase, fixing
the bug.
|
|
In a subsequent patch, it will be convenient if an Ada expression
operation can supply its own replacement object. This patch refactors
Ada expression resolution to make this possible.
|
|
I noticed that add_symbols_from_enclosing_procs is empty, and can be
removed. The one caller, ada_add_local_symbols, can also be
simplified, removing some code that, I think, was an incorrect attempt
to handle nested functions.
|
|
PR varobj/28131 points out a crash in the varobj deletion code. It
took a while to reproduce this, but essentially what happens is that a
top-level varobj deletes its root object, then deletes the "dynamic"
object. However, deletion of the dynamic object may cause
~py_varobj_iter to run, which in turn uses gdbpy_enter_varobj:
gdbpy_enter_varobj::gdbpy_enter_varobj (const struct varobj *var)
: gdbpy_enter (var->root->exp->gdbarch, var->root->exp->language_defn)
{
}
However, because var->root has already been destroyed, this is
invalid.
I've added a new test case. This doesn't reliably crash, but the
problem can easily be seen under valgrind (and, I presume, with ASAN,
though I did not try this).
Tested on x86-64 Fedora 32. I also propose putting this on the GDB 11
branch, with a suitable ChangeLog entry of course.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28131
|
|
When running with target board cc-with-dwz-m, we run into:
...
(gdb) file dw2-using-debug-str-no-debug-str^M
Reading symbols from dw2-using-debug-str-no-debug-str...^M
(gdb) FAIL: gdb.dwarf2/dw2-using-debug-str.exp: file dw2-using-debug-str
...
With native, the .debug_str section is present in the
dw2-using-debug-str executable, and removed from the
dw2-using-debug-str-no-debug-str executable. When loading the latter, a dwarf
error is triggered.
With cc-with-dwz-m, the .debug_str section is not present in the
dw2-using-debug-str executable, because it's already moved to
.tmp/dw2-using-debug-str.dwz. Consequently, the removal has no effect, and no
dwarf error is triggered, which causes the FAIL.
The same problem arises with target board cc-with-gnu-debuglink.
Fix this by detecting whether the .debug_str section is missing, and skipping
the remainder of the test-case.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-02 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/dw2-using-debug-str.exp: Handle missing .debug_str
section in dw2-using-debug-str.
|
|
When running with target board cc-with-gdb-index, we run into:
...
(gdb) file dw2-using-debug-str-no-debug-str^M
Reading symbols from dw2-using-debug-str-no-debug-str...^M
Dwarf Error: DW_FORM_strp used without required section^M
(gdb) FAIL: gdb.dwarf2/dw2-using-debug-str.exp: file dw2-using-debug-str
...
The test expects the dwarf error, but has no matching pattern for the entire
output.
Fix this by updating the regexp.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-02 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/dw2-using-debug-str.exp: Update regexp to match
cc-with-gdb-index output.
|
|
When running with target board cc-with-gdb-index, we run into:
...
rm: cannot remove '/tmp/tmp.JmYTeiuFjj/*.gdb-index': \
No such file or directory^M
FAIL: gdb.dwarf2/per-bfd-sharing.exp: \
couldn't remove files in temporary cache dir
...
Fix this, as in gdb.base/index-cache.exp, by only FAILing when
$expecting_index_cache_use.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-02 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/per-bfd-sharing.exp: Only expect index-cache files
when $expecting_index_cache_use.
|
|
When running with target board cc-with-gdb-index, we run into:
...
(gdb) save gdb-index .^M
Error while writing index for `gdb-index-nodebug': \
Cannot use an index to create the index^M
(gdb) FAIL: gdb.dwarf2/gdb-index-nodebug.exp: try to save gdb index
...
Fix this by detecting an already present index, and marking the test
unsupported.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-02 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/gdb-index-nodebug.exp: Mark unsupported when index
already present.
|
|
When running with target board cc-with-gdb-index, we run into:
...
gdb compile failed, warning: Could not find DWO CU \
fission-relative-dwo.dwo(0x1234) referenced by CU at offset 0xc7 \
[in module outputs/gdb.dwarf2/fission-relative-dwo/.tmp/fission-relative-dwo]
UNTESTED: gdb.dwarf2/fission-relative-dwo.exp: fission-relative-dwo.exp
ERROR: failed to compile fission-relative-dwo
...
The problem is that:
- the .dwo file is found relative to the executable, and
- cc-with-tweaks.sh moves the executable to a temp dir, but not
the .dwo file.
Fix this by copying the .dwo file alongside the executable in the temp dir.
Verified changes using shellcheck.
Tested on x86_64-linux.
gdb/ChangeLog:
2021-08-02 Tom de Vries <tdevries@suse.de>
* contrib/cc-with-tweaks.sh: Copy .dwo files alongside executable.
|
|
When printing the fields of a register that is of a custom struct type,
the "unpack_bits_as_long ()" function is used:
do_val_print (...)
cp_print_value_fields (...)
value_field_bitfield (...)
unpack_value_bitfield (...)
unpack_bits_as_long (...)
This function may sign-extend the extracted field while returning it:
val >>= lsbcount;
if (...)
{
valmask = (((ULONGEST) 1) << bitsize) - 1;
val &= valmask;
if (!field_type->is_unsigned ())
if (val & (valmask ^ (valmask >> 1)))
val |= ~valmask;
}
return val;
lsbcount: Number of lower bits to get rid of.
bitsize: The bit length of the field to be extracted.
val: The register value.
field_type: The type of field that is being handled.
While the logic here is correct, there is a problem when it is
handling "field_type"s of "boolean". Those types are NOT marked
as "unsigned" and therefore they end up being sign extended.
Although this is not a problem for "false" (0), it definitely
causes trouble for "true".
This patch constructs the builtin boolean type as such that it is
marked as an "unsigned" entity.
The issue tackled here was first encountered for arc-elf32 target
running on an x86_64 machine. The unit-test introduced in this change
has passed for all the targets (--enable-targets=all) running on the
same x86_64 host.
Fixes: https://sourceware.org/PR28104
|
|
With target board cc-with-gdb-index we run into:
...
FAIL: gdb.base/maint.exp: maint print statistics
...
The output that is checked is:
...
Statistics for 'maint':^M
Number of "minimal" symbols read: 53^M
Number of "full" symbols read: 40^M
Number of "types" defined: 60^M
Number of symbol tables: 7^M
Number of symbol tables with line tables: 2^M
Number of symbol tables with blockvectors: 2^M
Number of read CUs: 2^M
Number of unread CUs: 5^M
Total memory used for objfile obstack: 20320^M
Total memory used for BFD obstack: 4064^M
Total memory used for string cache: 4064^M
...
and the regexp doesn't match because it expects the "Number of read/unread
CUs" lines in a different place.
Fix this by updating the regexp.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-01 Tom de Vries <tdevries@suse.de>
* gdb.base/maint.exp: Update "maint print statistics" to match
output with target board cc-with-gdb-index.
|
|
With target board cc-with-gdb-index we run into:
...
FAIL: gdb.base/index-cache.exp: couldn't remove files in temporary cache dir
...
The problem is that there are no files to remove, because the index cache
isn't used, as indicated by $expecting_index_cache_use.
Fix this by only FAILing when $expecting_index_cache_use.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-01 Tom de Vries <tdevries@suse.de>
* gdb.base/index-cache.exp:
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This changes a couple of spots to replace custom iterator range
classes with a specialization of iterator_range.
Regression tested on x86-64 Fedora 34.
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I noticed that exception_print_same is only used in a single spot, and
it seemed to be better as an operator!= method attached to
gdb_exception.
Regression tested on x86-64 Fedora 34.
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The assertion
gdb_assert (nr_bits >= 1 && nr_bits <= type_bitsize);
is not correct. Well, it's correct in that we do want the number of
bits to be in the range [1, type_bitsize]. But we don't check anywhere
that the end of the specified flag is within the containing type.
The following code should generate a failed assertion, as the flag goes
past the 32 bits of the underlying type, but it's currently not caught:
static void
test_print_flag (gdbarch *arch)
{
type *flags_type = arch_flags_type (arch, "test_type", 32);
type *field_type = builtin_type (arch)->builtin_uint32;
append_flags_type_field (flags_type, 31, 2, field_type, "invalid");
}
(You can test this by registering it as a selftest using
selftests::register_test_foreach_arc and running.)
Change the assertion to verify that the end bit is within the range of
the underlying type. This implicitly verifies that nr_bits is not
too big as well, so we don't need a separate assertion for that.
Change-Id: I9be79e5fd7a5917bf25b03b598727e6274c892e8
Co-Authored-By: Tony Tye <Tony.Tye@amd.com>
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This improves the output of info threads when debugging multiple
inferiors (e.g. after a fork with detach_on_fork disabled).
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- Don't use #ifdef's on ptrace ops. obsd-nat.h didn't include
<sys/ptrace.h>, so the virtual methods weren't always overridden
causing the fork following to not work. In addition, the thread and
fork code is intertwined in ::wait and and the lack of #ifdef's
there already assumed both were present. Finally, both of these
ptrace ops have been present in OpenBSD for at least 10 years.
- Move duplicated code to enable PTRACE_FORK event reporting to a
single function and invoke it on new child processes reported via
PTRACE_FORK.
- Don't return early from PTRACE_FORK handling, but instead reset
wptid to the correct ptid if the child reports its event before the
parent. This allows the ptid fixup code to add thread IDs if the
first event for a process is a PTRACE_FORK event. This also
properly returns ptid's with thread IDs when reporting PTRACE_FORK
events.
- Handle detach_fork by skipping the PT_DETACH.
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- Call inf_ptrace_target::wait instead of duplicating the code.
Replace a check for WIFSTOPPED on the returned status from waitpid
by checking for TARGET_WAITKIND_STOPPED in the parsed status as is
done in fbsd_nat_target::wait.
- Don't use inferior_ptid when deciding if a new process is a child vs
parent of the fork. Instead, use find_inferior_pid and assume that
if an inferior already exists, the pid in question is the parent;
otherwise, the pid is the child.
- Don't use inferior_ptid when deciding if the ptid of the process
needs to be updated with an LWP ID, or if this is a new thread.
Instead, use the approach from fbsd-nat which is to check if a ptid
without an LWP exists and if so update the ptid of that thread
instead of adding a new thread.
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This fixes an unused function warning on OpenBSD which does not
support PT_GETDBREGS.
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