| /* Definitions for values of C expressions, for GDB. |
| |
| Copyright (C) 1986-2021 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/>. */ |
| |
| #if !defined (VALUE_H) |
| #define VALUE_H 1 |
| |
| #include "frame.h" /* For struct frame_id. */ |
| #include "extension.h" |
| #include "gdbsupport/gdb_ref_ptr.h" |
| #include "gmp-utils.h" |
| |
| struct block; |
| struct expression; |
| struct regcache; |
| struct symbol; |
| struct type; |
| struct ui_file; |
| struct language_defn; |
| struct value_print_options; |
| |
| /* Values can be partially 'optimized out' and/or 'unavailable'. |
| These are distinct states and have different string representations |
| and related error strings. |
| |
| 'unavailable' has a specific meaning in this context. It means the |
| value exists in the program (at the machine level), but GDB has no |
| means to get to it. Such a value is normally printed as |
| <unavailable>. Examples of how to end up with an unavailable value |
| would be: |
| |
| - We're inspecting a traceframe, and the memory or registers the |
| debug information says the value lives on haven't been collected. |
| |
| - We're inspecting a core dump, the memory or registers the debug |
| information says the value lives aren't present in the dump |
| (that is, we have a partial/trimmed core dump, or we don't fully |
| understand/handle the core dump's format). |
| |
| - We're doing live debugging, but the debug API has no means to |
| get at where the value lives in the machine, like e.g., ptrace |
| not having access to some register or register set. |
| |
| - Any other similar scenario. |
| |
| OTOH, "optimized out" is about what the compiler decided to generate |
| (or not generate). A chunk of a value that was optimized out does |
| not actually exist in the program. There's no way to get at it |
| short of compiling the program differently. |
| |
| A register that has not been saved in a frame is likewise considered |
| optimized out, except not-saved registers have a different string |
| representation and related error strings. E.g., we'll print them as |
| <not-saved> instead of <optimized out>, as in: |
| |
| (gdb) p/x $rax |
| $1 = <not saved> |
| (gdb) info registers rax |
| rax <not saved> |
| |
| If the debug info describes a variable as being in such a register, |
| we'll still print the variable as <optimized out>. IOW, <not saved> |
| is reserved for inspecting registers at the machine level. |
| |
| When comparing value contents, optimized out chunks, unavailable |
| chunks, and valid contents data are all considered different. See |
| value_contents_eq for more info. |
| */ |
| |
| extern bool overload_resolution; |
| |
| /* The structure which defines the type of a value. It should never |
| be possible for a program lval value to survive over a call to the |
| inferior (i.e. to be put into the history list or an internal |
| variable). */ |
| |
| struct value; |
| |
| /* Increase VAL's reference count. */ |
| |
| extern void value_incref (struct value *val); |
| |
| /* Decrease VAL's reference count. When the reference count drops to |
| 0, VAL will be freed. */ |
| |
| extern void value_decref (struct value *val); |
| |
| /* A policy class to interface gdb::ref_ptr with struct value. */ |
| |
| struct value_ref_policy |
| { |
| static void incref (struct value *ptr) |
| { |
| value_incref (ptr); |
| } |
| |
| static void decref (struct value *ptr) |
| { |
| value_decref (ptr); |
| } |
| }; |
| |
| /* A gdb:;ref_ptr pointer to a struct value. */ |
| |
| typedef gdb::ref_ptr<struct value, value_ref_policy> value_ref_ptr; |
| |
| /* Values are stored in a chain, so that they can be deleted easily |
| over calls to the inferior. Values assigned to internal variables, |
| put into the value history or exposed to Python are taken off this |
| list. */ |
| |
| struct value *value_next (const struct value *); |
| |
| /* Type of the value. */ |
| |
| extern struct type *value_type (const struct value *); |
| |
| /* Return the gdbarch associated with the value. */ |
| |
| extern struct gdbarch *get_value_arch (const struct value *value); |
| |
| /* This is being used to change the type of an existing value, that |
| code should instead be creating a new value with the changed type |
| (but possibly shared content). */ |
| |
| extern void deprecated_set_value_type (struct value *value, |
| struct type *type); |
| |
| /* Only used for bitfields; number of bits contained in them. */ |
| |
| extern LONGEST value_bitsize (const struct value *); |
| extern void set_value_bitsize (struct value *, LONGEST bit); |
| |
| /* Only used for bitfields; position of start of field. For |
| little-endian targets, it is the position of the LSB. For |
| big-endian targets, it is the position of the MSB. */ |
| |
| extern LONGEST value_bitpos (const struct value *); |
| extern void set_value_bitpos (struct value *, LONGEST bit); |
| |
| /* Only used for bitfields; the containing value. This allows a |
| single read from the target when displaying multiple |
| bitfields. */ |
| |
| struct value *value_parent (const struct value *); |
| extern void set_value_parent (struct value *value, struct value *parent); |
| |
| /* Describes offset of a value within lval of a structure in bytes. |
| If lval == lval_memory, this is an offset to the address. If lval |
| == lval_register, this is a further offset from location.address |
| within the registers structure. Note also the member |
| embedded_offset below. */ |
| |
| extern LONGEST value_offset (const struct value *); |
| extern void set_value_offset (struct value *, LONGEST offset); |
| |
| /* The comment from "struct value" reads: ``Is it modifiable? Only |
| relevant if lval != not_lval.''. Shouldn't the value instead be |
| not_lval and be done with it? */ |
| |
| extern int deprecated_value_modifiable (const struct value *value); |
| |
| /* If a value represents a C++ object, then the `type' field gives the |
| object's compile-time type. If the object actually belongs to some |
| class derived from `type', perhaps with other base classes and |
| additional members, then `type' is just a subobject of the real |
| thing, and the full object is probably larger than `type' would |
| suggest. |
| |
| If `type' is a dynamic class (i.e. one with a vtable), then GDB can |
| actually determine the object's run-time type by looking at the |
| run-time type information in the vtable. When this information is |
| available, we may elect to read in the entire object, for several |
| reasons: |
| |
| - When printing the value, the user would probably rather see the |
| full object, not just the limited portion apparent from the |
| compile-time type. |
| |
| - If `type' has virtual base classes, then even printing `type' |
| alone may require reaching outside the `type' portion of the |
| object to wherever the virtual base class has been stored. |
| |
| When we store the entire object, `enclosing_type' is the run-time |
| type -- the complete object -- and `embedded_offset' is the offset |
| of `type' within that larger type, in bytes. The value_contents() |
| macro takes `embedded_offset' into account, so most GDB code |
| continues to see the `type' portion of the value, just as the |
| inferior would. |
| |
| If `type' is a pointer to an object, then `enclosing_type' is a |
| pointer to the object's run-time type, and `pointed_to_offset' is |
| the offset in bytes from the full object to the pointed-to object |
| -- that is, the value `embedded_offset' would have if we followed |
| the pointer and fetched the complete object. (I don't really see |
| the point. Why not just determine the run-time type when you |
| indirect, and avoid the special case? The contents don't matter |
| until you indirect anyway.) |
| |
| If we're not doing anything fancy, `enclosing_type' is equal to |
| `type', and `embedded_offset' is zero, so everything works |
| normally. */ |
| |
| extern struct type *value_enclosing_type (const struct value *); |
| extern void set_value_enclosing_type (struct value *val, |
| struct type *new_type); |
| |
| /* Returns value_type or value_enclosing_type depending on |
| value_print_options.objectprint. |
| |
| If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved |
| only for pointers and references, else it will be returned |
| for all the types (e.g. structures). This option is useful |
| to prevent retrieving enclosing type for the base classes fields. |
| |
| REAL_TYPE_FOUND is used to inform whether the real type was found |
| (or just static type was used). The NULL may be passed if it is not |
| necessary. */ |
| |
| extern struct type *value_actual_type (struct value *value, |
| int resolve_simple_types, |
| int *real_type_found); |
| |
| extern LONGEST value_pointed_to_offset (const struct value *value); |
| extern void set_value_pointed_to_offset (struct value *value, LONGEST val); |
| extern LONGEST value_embedded_offset (const struct value *value); |
| extern void set_value_embedded_offset (struct value *value, LONGEST val); |
| |
| /* For lval_computed values, this structure holds functions used to |
| retrieve and set the value (or portions of the value). |
| |
| For each function, 'V' is the 'this' pointer: an lval_funcs |
| function F may always assume that the V it receives is an |
| lval_computed value, and has F in the appropriate slot of its |
| lval_funcs structure. */ |
| |
| struct lval_funcs |
| { |
| /* Fill in VALUE's contents. This is used to "un-lazy" values. If |
| a problem arises in obtaining VALUE's bits, this function should |
| call 'error'. If it is NULL value_fetch_lazy on "un-lazy" |
| non-optimized-out value is an internal error. */ |
| void (*read) (struct value *v); |
| |
| /* Handle an assignment TOVAL = FROMVAL by writing the value of |
| FROMVAL to TOVAL's location. The contents of TOVAL have not yet |
| been updated. If a problem arises in doing so, this function |
| should call 'error'. If it is NULL such TOVAL assignment is an error as |
| TOVAL is not considered as an lvalue. */ |
| void (*write) (struct value *toval, struct value *fromval); |
| |
| /* Return true if any part of V is optimized out, false otherwise. |
| This will only be called for lazy values -- if the value has been |
| fetched, then the value's optimized-out bits are consulted |
| instead. */ |
| bool (*is_optimized_out) (struct value *v); |
| |
| /* If non-NULL, this is used to implement pointer indirection for |
| this value. This method may return NULL, in which case value_ind |
| will fall back to ordinary indirection. */ |
| struct value *(*indirect) (struct value *value); |
| |
| /* If non-NULL, this is used to implement reference resolving for |
| this value. This method may return NULL, in which case coerce_ref |
| will fall back to ordinary references resolving. */ |
| struct value *(*coerce_ref) (const struct value *value); |
| |
| /* If non-NULL, this is used to determine whether the indicated bits |
| of VALUE are a synthetic pointer. */ |
| int (*check_synthetic_pointer) (const struct value *value, |
| LONGEST offset, int length); |
| |
| /* Return a duplicate of VALUE's closure, for use in a new value. |
| This may simply return the same closure, if VALUE's is |
| reference-counted or statically allocated. |
| |
| This may be NULL, in which case VALUE's closure is re-used in the |
| new value. */ |
| void *(*copy_closure) (const struct value *v); |
| |
| /* Drop VALUE's reference to its closure. Maybe this frees the |
| closure; maybe this decrements a reference count; maybe the |
| closure is statically allocated and this does nothing. |
| |
| This may be NULL, in which case no action is taken to free |
| VALUE's closure. */ |
| void (*free_closure) (struct value *v); |
| }; |
| |
| /* Create a computed lvalue, with type TYPE, function pointers FUNCS, |
| and closure CLOSURE. */ |
| |
| extern struct value *allocate_computed_value (struct type *type, |
| const struct lval_funcs *funcs, |
| void *closure); |
| |
| extern struct value *allocate_optimized_out_value (struct type *type); |
| |
| /* If VALUE is lval_computed, return its lval_funcs structure. */ |
| |
| extern const struct lval_funcs *value_computed_funcs (const struct value *); |
| |
| /* If VALUE is lval_computed, return its closure. The meaning of the |
| returned value depends on the functions VALUE uses. */ |
| |
| extern void *value_computed_closure (const struct value *value); |
| |
| /* If zero, contents of this value are in the contents field. If |
| nonzero, contents are in inferior. If the lval field is lval_memory, |
| the contents are in inferior memory at location.address plus offset. |
| The lval field may also be lval_register. |
| |
| WARNING: This field is used by the code which handles watchpoints |
| (see breakpoint.c) to decide whether a particular value can be |
| watched by hardware watchpoints. If the lazy flag is set for some |
| member of a value chain, it is assumed that this member of the |
| chain doesn't need to be watched as part of watching the value |
| itself. This is how GDB avoids watching the entire struct or array |
| when the user wants to watch a single struct member or array |
| element. If you ever change the way lazy flag is set and reset, be |
| sure to consider this use as well! */ |
| |
| extern int value_lazy (const struct value *); |
| extern void set_value_lazy (struct value *value, int val); |
| |
| extern int value_stack (const struct value *); |
| extern void set_value_stack (struct value *value, int val); |
| |
| /* Throw an error complaining that the value has been optimized |
| out. */ |
| |
| extern void error_value_optimized_out (void); |
| |
| /* value_contents() and value_contents_raw() both return the address |
| of the gdb buffer used to hold a copy of the contents of the lval. |
| value_contents() is used when the contents of the buffer are needed |
| -- it uses value_fetch_lazy() to load the buffer from the process |
| being debugged if it hasn't already been loaded |
| (value_contents_writeable() is used when a writeable but fetched |
| buffer is required).. value_contents_raw() is used when data is |
| being stored into the buffer, or when it is certain that the |
| contents of the buffer are valid. |
| |
| Note: The contents pointer is adjusted by the offset required to |
| get to the real subobject, if the value happens to represent |
| something embedded in a larger run-time object. */ |
| |
| extern gdb_byte *value_contents_raw (struct value *); |
| |
| /* Actual contents of the value. For use of this value; setting it |
| uses the stuff above. Not valid if lazy is nonzero. Target |
| byte-order. We force it to be aligned properly for any possible |
| value. Note that a value therefore extends beyond what is |
| declared here. */ |
| |
| extern const gdb_byte *value_contents (struct value *); |
| extern gdb_byte *value_contents_writeable (struct value *); |
| |
| /* The ALL variants of the above two macros do not adjust the returned |
| pointer by the embedded_offset value. */ |
| |
| extern gdb_byte *value_contents_all_raw (struct value *); |
| extern const gdb_byte *value_contents_all (struct value *); |
| |
| /* Like value_contents_all, but does not require that the returned |
| bits be valid. This should only be used in situations where you |
| plan to check the validity manually. */ |
| extern const gdb_byte *value_contents_for_printing (struct value *value); |
| |
| /* Like value_contents_for_printing, but accepts a constant value |
| pointer. Unlike value_contents_for_printing however, the pointed |
| value must _not_ be lazy. */ |
| extern const gdb_byte * |
| value_contents_for_printing_const (const struct value *value); |
| |
| extern void value_fetch_lazy (struct value *val); |
| |
| /* If nonzero, this is the value of a variable which does not actually |
| exist in the program, at least partially. If the value is lazy, |
| this may fetch it now. */ |
| extern int value_optimized_out (struct value *value); |
| |
| /* Given a value, return true if any of the contents bits starting at |
| OFFSET and extending for LENGTH bits is optimized out, false |
| otherwise. */ |
| |
| extern int value_bits_any_optimized_out (const struct value *value, |
| int bit_offset, int bit_length); |
| |
| /* Like value_optimized_out, but return true iff the whole value is |
| optimized out. */ |
| extern int value_entirely_optimized_out (struct value *value); |
| |
| /* Mark VALUE's content bytes starting at OFFSET and extending for |
| LENGTH bytes as optimized out. */ |
| |
| extern void mark_value_bytes_optimized_out (struct value *value, |
| int offset, int length); |
| |
| /* Mark VALUE's content bits starting at OFFSET and extending for |
| LENGTH bits as optimized out. */ |
| |
| extern void mark_value_bits_optimized_out (struct value *value, |
| LONGEST offset, LONGEST length); |
| |
| /* Set or return field indicating whether a variable is initialized or |
| not, based on debugging information supplied by the compiler. |
| 1 = initialized; 0 = uninitialized. */ |
| extern int value_initialized (const struct value *); |
| extern void set_value_initialized (struct value *, int); |
| |
| /* Set COMPONENT's location as appropriate for a component of WHOLE |
| --- regardless of what kind of lvalue WHOLE is. */ |
| extern void set_value_component_location (struct value *component, |
| const struct value *whole); |
| |
| /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a |
| single value might have multiple LVALs), this hacked interface is |
| limited to just the first PIECE. Expect further change. */ |
| /* Type of value; either not an lval, or one of the various different |
| possible kinds of lval. */ |
| extern enum lval_type *deprecated_value_lval_hack (struct value *); |
| #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val)) |
| |
| /* Like VALUE_LVAL, except the parameter can be const. */ |
| extern enum lval_type value_lval_const (const struct value *value); |
| |
| /* If lval == lval_memory, return the address in the inferior. If |
| lval == lval_register, return the byte offset into the registers |
| structure. Otherwise, return 0. The returned address |
| includes the offset, if any. */ |
| extern CORE_ADDR value_address (const struct value *); |
| |
| /* Like value_address, except the result does not include value's |
| offset. */ |
| extern CORE_ADDR value_raw_address (const struct value *); |
| |
| /* Set the address of a value. */ |
| extern void set_value_address (struct value *, CORE_ADDR); |
| |
| /* Pointer to internal variable. */ |
| extern struct internalvar **deprecated_value_internalvar_hack (struct value *); |
| #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val)) |
| |
| /* Frame ID of "next" frame to which a register value is relative. A |
| register value is indicated by VALUE_LVAL being set to lval_register. |
| So, if the register value is found relative to frame F, then the |
| frame id of F->next will be stored in VALUE_NEXT_FRAME_ID. */ |
| extern struct frame_id *deprecated_value_next_frame_id_hack (struct value *); |
| #define VALUE_NEXT_FRAME_ID(val) (*deprecated_value_next_frame_id_hack (val)) |
| |
| /* Register number if the value is from a register. */ |
| extern int *deprecated_value_regnum_hack (struct value *); |
| #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val)) |
| |
| /* Return value after lval_funcs->coerce_ref (after check_typedef). Return |
| NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */ |
| |
| 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_VALUE_ADDRESS is the address within VALUE, that is |
| the address that was dereferenced. |
| |
| Note, that VALUE is modified by this function. |
| |
| It is a common implementation for coerce_ref and value_ind. */ |
| |
| extern struct value * readjust_indirect_value_type (struct value *value, |
| struct type *enc_type, |
| const struct type *original_type, |
| struct value *original_val, |
| CORE_ADDR original_value_address); |
| |
| /* Convert a REF to the object referenced. */ |
| |
| extern struct value *coerce_ref (struct value *value); |
| |
| /* If ARG is an array, convert it to a pointer. |
| If ARG is a function, convert it to a function pointer. |
| |
| References are dereferenced. */ |
| |
| extern struct value *coerce_array (struct value *value); |
| |
| /* Given a value, determine whether the bits starting at OFFSET and |
| extending for LENGTH bits are a synthetic pointer. */ |
| |
| extern int value_bits_synthetic_pointer (const struct value *value, |
| LONGEST offset, LONGEST length); |
| |
| /* Given a value, determine whether the contents bytes starting at |
| OFFSET and extending for LENGTH bytes are available. This returns |
| nonzero if all bytes in the given range are available, zero if any |
| byte is unavailable. */ |
| |
| extern int value_bytes_available (const struct value *value, |
| LONGEST offset, LONGEST length); |
| |
| /* Given a value, determine whether the contents bits starting at |
| OFFSET and extending for LENGTH bits are available. This returns |
| nonzero if all bits in the given range are available, zero if any |
| bit is unavailable. */ |
| |
| extern int value_bits_available (const struct value *value, |
| LONGEST offset, LONGEST length); |
| |
| /* Like value_bytes_available, but return false if any byte in the |
| whole object is unavailable. */ |
| extern int value_entirely_available (struct value *value); |
| |
| /* Like value_entirely_available, but return false if any byte in the |
| whole object is available. */ |
| extern int value_entirely_unavailable (struct value *value); |
| |
| /* Mark VALUE's content bytes starting at OFFSET and extending for |
| LENGTH bytes as unavailable. */ |
| |
| extern void mark_value_bytes_unavailable (struct value *value, |
| LONGEST offset, LONGEST length); |
| |
| /* Mark VALUE's content bits starting at OFFSET and extending for |
| LENGTH bits as unavailable. */ |
| |
| extern void mark_value_bits_unavailable (struct value *value, |
| LONGEST offset, LONGEST length); |
| |
| /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with |
| LENGTH bytes of VAL2's contents starting at OFFSET2. |
| |
| Note that "contents" refers to the whole value's contents |
| (value_contents_all), without any embedded offset adjustment. For |
| example, to compare a complete object value with itself, including |
| its enclosing type chunk, you'd do: |
| |
| int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val))); |
| value_contents_eq (val, 0, val, 0, len); |
| |
| Returns true iff the set of available/valid contents match. |
| |
| Optimized-out contents are equal to optimized-out contents, and are |
| not equal to non-optimized-out contents. |
| |
| Unavailable contents are equal to unavailable contents, and are not |
| equal to non-unavailable contents. |
| |
| For example, if 'x's represent an unavailable byte, and 'V' and 'Z' |
| represent different available/valid bytes, in a value with length |
| 16: |
| |
| offset: 0 4 8 12 16 |
| contents: xxxxVVVVxxxxVVZZ |
| |
| then: |
| |
| value_contents_eq(val, 0, val, 8, 6) => true |
| value_contents_eq(val, 0, val, 4, 4) => false |
| value_contents_eq(val, 0, val, 8, 8) => false |
| value_contents_eq(val, 4, val, 12, 2) => true |
| value_contents_eq(val, 4, val, 12, 4) => true |
| value_contents_eq(val, 3, val, 4, 4) => true |
| |
| If 'x's represent an unavailable byte, 'o' represents an optimized |
| out byte, in a value with length 8: |
| |
| offset: 0 4 8 |
| contents: xxxxoooo |
| |
| then: |
| |
| value_contents_eq(val, 0, val, 2, 2) => true |
| value_contents_eq(val, 4, val, 6, 2) => true |
| value_contents_eq(val, 0, val, 4, 4) => true |
| |
| We only know whether a value chunk is unavailable or optimized out |
| if we've tried to read it. As this routine is used by printing |
| routines, which may be printing values in the value history, long |
| after the inferior is gone, it works with const values. Therefore, |
| this routine must not be called with lazy values. */ |
| |
| extern bool value_contents_eq (const struct value *val1, LONGEST offset1, |
| const struct value *val2, LONGEST offset2, |
| LONGEST length); |
| |
| /* Read LENGTH addressable memory units starting at MEMADDR into BUFFER, |
| which is (or will be copied to) VAL's contents buffer offset by |
| BIT_OFFSET bits. Marks value contents ranges as unavailable if |
| the corresponding memory is likewise unavailable. STACK indicates |
| whether the memory is known to be stack memory. */ |
| |
| extern void read_value_memory (struct value *val, LONGEST bit_offset, |
| int stack, CORE_ADDR memaddr, |
| gdb_byte *buffer, size_t length); |
| |
| /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate |
| into each element of a new vector value with VECTOR_TYPE. */ |
| |
| struct value *value_vector_widen (struct value *scalar_value, |
| struct type *vector_type); |
| |
| |
| |
| #include "symtab.h" |
| #include "gdbtypes.h" |
| #include "expression.h" |
| |
| struct frame_info; |
| struct fn_field; |
| |
| extern int print_address_demangle (const struct value_print_options *, |
| struct gdbarch *, CORE_ADDR, |
| struct ui_file *, int); |
| |
| /* Returns true if VAL is of floating-point type. In addition, |
| throws an error if the value is an invalid floating-point value. */ |
| extern bool is_floating_value (struct value *val); |
| |
| extern LONGEST value_as_long (struct value *val); |
| extern CORE_ADDR value_as_address (struct value *val); |
| |
| extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr); |
| extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr); |
| |
| extern LONGEST unpack_field_as_long (struct type *type, |
| const gdb_byte *valaddr, |
| int fieldno); |
| |
| /* Unpack a bitfield of the specified FIELD_TYPE, from the object at |
| VALADDR, and store the result in *RESULT. |
| The bitfield starts at BITPOS bits and contains BITSIZE bits; if |
| BITSIZE is zero, then the length is taken from FIELD_TYPE. |
| |
| Extracting bits depends on endianness of the machine. Compute the |
| number of least significant bits to discard. For big endian machines, |
| we compute the total number of bits in the anonymous object, subtract |
| off the bit count from the MSB of the object to the MSB of the |
| bitfield, then the size of the bitfield, which leaves the LSB discard |
| count. For little endian machines, the discard count is simply the |
| number of bits from the LSB of the anonymous object to the LSB of the |
| bitfield. |
| |
| If the field is signed, we also do sign extension. */ |
| |
| extern LONGEST unpack_bits_as_long (struct type *field_type, |
| const gdb_byte *valaddr, |
| LONGEST bitpos, LONGEST bitsize); |
| |
| extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr, |
| LONGEST embedded_offset, int fieldno, |
| const struct value *val, LONGEST *result); |
| |
| extern void unpack_value_bitfield (struct value *dest_val, |
| LONGEST bitpos, LONGEST bitsize, |
| const gdb_byte *valaddr, |
| LONGEST embedded_offset, |
| const struct value *val); |
| |
| extern struct value *value_field_bitfield (struct type *type, int fieldno, |
| const gdb_byte *valaddr, |
| LONGEST embedded_offset, |
| const struct value *val); |
| |
| extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num); |
| |
| extern struct value *value_from_longest (struct type *type, LONGEST num); |
| extern struct value *value_from_ulongest (struct type *type, ULONGEST num); |
| extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr); |
| extern struct value *value_from_host_double (struct type *type, double d); |
| extern struct value *value_from_history_ref (const char *, const char **); |
| extern struct value *value_from_component (struct value *, struct type *, |
| LONGEST); |
| |
| extern struct value *value_at (struct type *type, CORE_ADDR addr); |
| extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr); |
| |
| extern struct value *value_from_contents_and_address_unresolved |
| (struct type *, const gdb_byte *, CORE_ADDR); |
| extern struct value *value_from_contents_and_address (struct type *, |
| const gdb_byte *, |
| CORE_ADDR); |
| extern struct value *value_from_contents (struct type *, const gdb_byte *); |
| |
| extern struct value *default_value_from_register (struct gdbarch *gdbarch, |
| struct type *type, |
| int regnum, |
| struct frame_id frame_id); |
| |
| extern void read_frame_register_value (struct value *value, |
| struct frame_info *frame); |
| |
| extern struct value *value_from_register (struct type *type, int regnum, |
| struct frame_info *frame); |
| |
| extern CORE_ADDR address_from_register (int regnum, |
| struct frame_info *frame); |
| |
| extern struct value *value_of_variable (struct symbol *var, |
| const struct block *b); |
| |
| extern struct value *address_of_variable (struct symbol *var, |
| const struct block *b); |
| |
| extern struct value *value_of_register (int regnum, struct frame_info *frame); |
| |
| struct value *value_of_register_lazy (struct frame_info *frame, int regnum); |
| |
| /* Return the symbol's reading requirement. */ |
| |
| extern enum symbol_needs_kind symbol_read_needs (struct symbol *); |
| |
| /* Return true if the symbol needs a frame. This is a wrapper for |
| symbol_read_needs that simply checks for SYMBOL_NEEDS_FRAME. */ |
| |
| extern int symbol_read_needs_frame (struct symbol *); |
| |
| extern struct value *read_var_value (struct symbol *var, |
| const struct block *var_block, |
| struct frame_info *frame); |
| |
| extern struct value *allocate_value (struct type *type); |
| extern struct value *allocate_value_lazy (struct type *type); |
| extern void value_contents_copy (struct value *dst, LONGEST dst_offset, |
| struct value *src, LONGEST src_offset, |
| LONGEST length); |
| |
| extern struct value *allocate_repeat_value (struct type *type, int count); |
| |
| extern struct value *value_mark (void); |
| |
| extern void value_free_to_mark (const struct value *mark); |
| |
| /* A helper class that uses value_mark at construction time and calls |
| value_free_to_mark in the destructor. This is used to clear out |
| temporary values created during the lifetime of this object. */ |
| class scoped_value_mark |
| { |
| public: |
| |
| scoped_value_mark () |
| : m_value (value_mark ()) |
| { |
| } |
| |
| ~scoped_value_mark () |
| { |
| free_to_mark (); |
| } |
| |
| scoped_value_mark (scoped_value_mark &&other) = default; |
| |
| DISABLE_COPY_AND_ASSIGN (scoped_value_mark); |
| |
| /* Free the values currently on the value stack. */ |
| void free_to_mark () |
| { |
| if (m_value != NULL) |
| { |
| value_free_to_mark (m_value); |
| m_value = NULL; |
| } |
| } |
| |
| private: |
| |
| const struct value *m_value; |
| }; |
| |
| extern struct value *value_cstring (const char *ptr, ssize_t len, |
| struct type *char_type); |
| extern struct value *value_string (const char *ptr, ssize_t len, |
| struct type *char_type); |
| |
| extern struct value *value_array (int lowbound, int highbound, |
| struct value **elemvec); |
| |
| extern struct value *value_concat (struct value *arg1, struct value *arg2); |
| |
| extern struct value *value_binop (struct value *arg1, struct value *arg2, |
| enum exp_opcode op); |
| |
| extern struct value *value_ptradd (struct value *arg1, LONGEST arg2); |
| |
| extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2); |
| |
| /* Return true if VAL does not live in target memory, but should in order |
| to operate on it. Otherwise return false. */ |
| |
| extern bool value_must_coerce_to_target (struct value *arg1); |
| |
| extern struct value *value_coerce_to_target (struct value *arg1); |
| |
| extern struct value *value_coerce_array (struct value *arg1); |
| |
| extern struct value *value_coerce_function (struct value *arg1); |
| |
| extern struct value *value_ind (struct value *arg1); |
| |
| extern struct value *value_addr (struct value *arg1); |
| |
| extern struct value *value_ref (struct value *arg1, enum type_code refcode); |
| |
| extern struct value *value_assign (struct value *toval, |
| struct value *fromval); |
| |
| extern struct value *value_pos (struct value *arg1); |
| |
| extern struct value *value_neg (struct value *arg1); |
| |
| extern struct value *value_complement (struct value *arg1); |
| |
| extern struct value *value_struct_elt (struct value **argp, |
| gdb::optional<gdb::array_view <value *>> args, |
| const char *name, int *static_memfuncp, |
| const char *err); |
| |
| extern struct value *value_struct_elt_bitpos (struct value **argp, |
| int bitpos, |
| struct type *field_type, |
| const char *err); |
| |
| extern struct value *value_aggregate_elt (struct type *curtype, |
| const char *name, |
| struct type *expect_type, |
| int want_address, |
| enum noside noside); |
| |
| extern struct value *value_static_field (struct type *type, int fieldno); |
| |
| enum oload_search_type { NON_METHOD, METHOD, BOTH }; |
| |
| extern int find_overload_match (gdb::array_view<value *> args, |
| const char *name, |
| enum oload_search_type method, |
| struct value **objp, struct symbol *fsym, |
| struct value **valp, struct symbol **symp, |
| int *staticp, const int no_adl, |
| enum noside noside); |
| |
| extern struct value *value_field (struct value *arg1, int fieldno); |
| |
| extern struct value *value_primitive_field (struct value *arg1, LONGEST offset, |
| int fieldno, |
| struct type *arg_type); |
| |
| |
| extern struct type *value_rtti_indirect_type (struct value *, int *, LONGEST *, |
| int *); |
| |
| extern struct value *value_full_object (struct value *, struct type *, int, |
| int, int); |
| |
| extern struct value *value_cast_pointers (struct type *, struct value *, int); |
| |
| extern struct value *value_cast (struct type *type, struct value *arg2); |
| |
| extern struct value *value_reinterpret_cast (struct type *type, |
| struct value *arg); |
| |
| extern struct value *value_dynamic_cast (struct type *type, struct value *arg); |
| |
| extern struct value *value_zero (struct type *type, enum lval_type lv); |
| |
| extern struct value *value_one (struct type *type); |
| |
| extern struct value *value_repeat (struct value *arg1, int count); |
| |
| extern struct value *value_subscript (struct value *array, LONGEST index); |
| |
| extern struct value *value_bitstring_subscript (struct type *type, |
| struct value *bitstring, |
| LONGEST index); |
| |
| extern struct value *register_value_being_returned (struct type *valtype, |
| struct regcache *retbuf); |
| |
| extern int value_in (struct value *element, struct value *set); |
| |
| extern int value_bit_index (struct type *type, const gdb_byte *addr, |
| int index); |
| |
| extern enum return_value_convention |
| struct_return_convention (struct gdbarch *gdbarch, struct value *function, |
| struct type *value_type); |
| |
| extern int using_struct_return (struct gdbarch *gdbarch, |
| struct value *function, |
| struct type *value_type); |
| |
| /* Evaluate the expression EXP. If set, EXPECT_TYPE is passed to the |
| outermost operation's evaluation. This is ignored by most |
| operations, but may be used, e.g., to determine the type of an |
| otherwise untyped symbol. The caller should not assume that the |
| returned value has this type. */ |
| |
| extern struct value *evaluate_expression (struct expression *exp, |
| struct type *expect_type = nullptr); |
| |
| extern struct value *evaluate_type (struct expression *exp); |
| |
| extern value *evaluate_var_value (enum noside noside, const block *blk, |
| symbol *var); |
| |
| extern value *evaluate_var_msym_value (enum noside noside, |
| struct objfile *objfile, |
| minimal_symbol *msymbol); |
| |
| namespace expr { class operation; }; |
| extern void fetch_subexp_value (struct expression *exp, |
| expr::operation *op, |
| struct value **valp, struct value **resultp, |
| std::vector<value_ref_ptr> *val_chain, |
| bool preserve_errors); |
| |
| extern struct value *parse_and_eval (const char *exp); |
| |
| extern struct value *parse_to_comma_and_eval (const char **expp); |
| |
| extern struct type *parse_and_eval_type (const char *p, int length); |
| |
| extern CORE_ADDR parse_and_eval_address (const char *exp); |
| |
| extern LONGEST parse_and_eval_long (const char *exp); |
| |
| extern void unop_promote (const struct language_defn *language, |
| struct gdbarch *gdbarch, |
| struct value **arg1); |
| |
| extern void binop_promote (const struct language_defn *language, |
| struct gdbarch *gdbarch, |
| struct value **arg1, struct value **arg2); |
| |
| extern struct value *access_value_history (int num); |
| |
| extern struct value *value_of_internalvar (struct gdbarch *gdbarch, |
| struct internalvar *var); |
| |
| extern int get_internalvar_integer (struct internalvar *var, LONGEST *l); |
| |
| extern void set_internalvar (struct internalvar *var, struct value *val); |
| |
| extern void set_internalvar_integer (struct internalvar *var, LONGEST l); |
| |
| extern void set_internalvar_string (struct internalvar *var, |
| const char *string); |
| |
| extern void clear_internalvar (struct internalvar *var); |
| |
| extern void set_internalvar_component (struct internalvar *var, |
| LONGEST offset, |
| LONGEST bitpos, LONGEST bitsize, |
| struct value *newvalue); |
| |
| extern struct internalvar *lookup_only_internalvar (const char *name); |
| |
| extern struct internalvar *create_internalvar (const char *name); |
| |
| extern void complete_internalvar (completion_tracker &tracker, |
| const char *name); |
| |
| /* An internalvar can be dynamically computed by supplying a vector of |
| function pointers to perform various operations. */ |
| |
| struct internalvar_funcs |
| { |
| /* Compute the value of the variable. The DATA argument passed to |
| the function is the same argument that was passed to |
| `create_internalvar_type_lazy'. */ |
| |
| struct value *(*make_value) (struct gdbarch *arch, |
| struct internalvar *var, |
| void *data); |
| |
| /* Update the agent expression EXPR with bytecode to compute the |
| value. VALUE is the agent value we are updating. The DATA |
| argument passed to this function is the same argument that was |
| passed to `create_internalvar_type_lazy'. If this pointer is |
| NULL, then the internalvar cannot be compiled to an agent |
| expression. */ |
| |
| void (*compile_to_ax) (struct internalvar *var, |
| struct agent_expr *expr, |
| struct axs_value *value, |
| void *data); |
| |
| /* If non-NULL, this is called to destroy DATA. The DATA argument |
| passed to this function is the same argument that was passed to |
| `create_internalvar_type_lazy'. */ |
| |
| void (*destroy) (void *data); |
| }; |
| |
| extern struct internalvar *create_internalvar_type_lazy (const char *name, |
| const struct internalvar_funcs *funcs, |
| void *data); |
| |
| /* Compile an internal variable to an agent expression. VAR is the |
| variable to compile; EXPR and VALUE are the agent expression we are |
| updating. This will return 0 if there is no known way to compile |
| VAR, and 1 if VAR was successfully compiled. It may also throw an |
| exception on error. */ |
| |
| extern int compile_internalvar_to_ax (struct internalvar *var, |
| struct agent_expr *expr, |
| struct axs_value *value); |
| |
| extern struct internalvar *lookup_internalvar (const char *name); |
| |
| extern int value_equal (struct value *arg1, struct value *arg2); |
| |
| extern int value_equal_contents (struct value *arg1, struct value *arg2); |
| |
| extern int value_less (struct value *arg1, struct value *arg2); |
| |
| /* Simulate the C operator ! -- return true if ARG1 contains zero. */ |
| extern bool value_logical_not (struct value *arg1); |
| |
| /* Returns true if the value VAL represents a true value. */ |
| static inline bool |
| value_true (struct value *val) |
| { |
| return !value_logical_not (val); |
| } |
| |
| /* C++ */ |
| |
| extern struct value *value_of_this (const struct language_defn *lang); |
| |
| extern struct value *value_of_this_silent (const struct language_defn *lang); |
| |
| extern struct value *value_x_binop (struct value *arg1, struct value *arg2, |
| enum exp_opcode op, |
| enum exp_opcode otherop, |
| enum noside noside); |
| |
| extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op, |
| enum noside noside); |
| |
| extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f, |
| int j, struct type *type, LONGEST offset); |
| |
| extern int binop_types_user_defined_p (enum exp_opcode op, |
| struct type *type1, |
| struct type *type2); |
| |
| extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1, |
| struct value *arg2); |
| |
| extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1); |
| |
| extern int destructor_name_p (const char *name, struct type *type); |
| |
| extern value_ref_ptr release_value (struct value *val); |
| |
| extern int record_latest_value (struct value *val); |
| |
| extern void modify_field (struct type *type, gdb_byte *addr, |
| LONGEST fieldval, LONGEST bitpos, LONGEST bitsize); |
| |
| extern void type_print (struct type *type, const char *varstring, |
| struct ui_file *stream, int show); |
| |
| extern std::string type_to_string (struct type *type); |
| |
| extern gdb_byte *baseclass_addr (struct type *type, int index, |
| gdb_byte *valaddr, |
| struct value **valuep, int *errp); |
| |
| extern void print_longest (struct ui_file *stream, int format, |
| int use_local, LONGEST val); |
| |
| extern void print_floating (const gdb_byte *valaddr, struct type *type, |
| struct ui_file *stream); |
| |
| extern void value_print (struct value *val, struct ui_file *stream, |
| const struct value_print_options *options); |
| |
| extern void value_print_array_elements (struct value *val, |
| struct ui_file *stream, int format, |
| enum val_prettyformat pretty); |
| |
| /* Release values from the value chain and return them. Values |
| created after MARK are released. If MARK is nullptr, or if MARK is |
| not found on the value chain, then all values are released. Values |
| are returned in reverse order of creation; that is, newest |
| first. */ |
| |
| extern std::vector<value_ref_ptr> value_release_to_mark |
| (const struct value *mark); |
| |
| extern void common_val_print (struct value *val, |
| struct ui_file *stream, int recurse, |
| const struct value_print_options *options, |
| const struct language_defn *language); |
| |
| extern int val_print_string (struct type *elttype, const char *encoding, |
| CORE_ADDR addr, int len, |
| struct ui_file *stream, |
| const struct value_print_options *options); |
| |
| extern void print_variable_and_value (const char *name, |
| struct symbol *var, |
| struct frame_info *frame, |
| struct ui_file *stream, |
| int indent); |
| |
| extern void typedef_print (struct type *type, struct symbol *news, |
| struct ui_file *stream); |
| |
| extern const char *internalvar_name (const struct internalvar *var); |
| |
| extern void preserve_values (struct objfile *); |
| |
| /* From values.c */ |
| |
| extern struct value *value_copy (struct value *); |
| |
| extern struct value *value_non_lval (struct value *); |
| |
| extern void value_force_lval (struct value *, CORE_ADDR); |
| |
| extern struct value *make_cv_value (int, int, struct value *); |
| |
| extern void preserve_one_value (struct value *, struct objfile *, htab_t); |
| |
| /* From valops.c */ |
| |
| extern struct value *varying_to_slice (struct value *); |
| |
| extern struct value *value_slice (struct value *, int, int); |
| |
| /* Create a complex number. The type is the complex type; the values |
| are cast to the underlying scalar type before the complex number is |
| created. */ |
| |
| extern struct value *value_literal_complex (struct value *, struct value *, |
| struct type *); |
| |
| /* Return the real part of a complex value. */ |
| |
| extern struct value *value_real_part (struct value *value); |
| |
| /* Return the imaginary part of a complex value. */ |
| |
| extern struct value *value_imaginary_part (struct value *value); |
| |
| extern struct value *find_function_in_inferior (const char *, |
| struct objfile **); |
| |
| extern struct value *value_allocate_space_in_inferior (int); |
| |
| extern struct value *value_subscripted_rvalue (struct value *array, |
| LONGEST index, |
| LONGEST lowerbound); |
| |
| /* User function handler. */ |
| |
| typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch, |
| const struct language_defn *language, |
| void *cookie, |
| int argc, |
| struct value **argv); |
| |
| /* Add a new internal function. NAME is the name of the function; DOC |
| is a documentation string describing the function. HANDLER is |
| called when the function is invoked. COOKIE is an arbitrary |
| pointer which is passed to HANDLER and is intended for "user |
| data". */ |
| |
| extern void add_internal_function (const char *name, const char *doc, |
| internal_function_fn handler, |
| void *cookie); |
| |
| /* This overload takes an allocated documentation string. */ |
| |
| extern void add_internal_function (gdb::unique_xmalloc_ptr<char> &&name, |
| gdb::unique_xmalloc_ptr<char> &&doc, |
| internal_function_fn handler, |
| void *cookie); |
| |
| struct value *call_internal_function (struct gdbarch *gdbarch, |
| const struct language_defn *language, |
| struct value *function, |
| int argc, struct value **argv); |
| |
| const char *value_internal_function_name (struct value *); |
| |
| /* Build a value wrapping and representing WORKER. The value takes ownership |
| of the xmethod_worker object. */ |
| |
| extern struct value *value_from_xmethod (xmethod_worker_up &&worker); |
| |
| extern struct type *result_type_of_xmethod (struct value *method, |
| gdb::array_view<value *> argv); |
| |
| extern struct value *call_xmethod (struct value *method, |
| gdb::array_view<value *> argv); |
| |
| /* Destroy the values currently allocated. This is called when GDB is |
| exiting (e.g., on quit_force). */ |
| extern void finalize_values (); |
| |
| /* Convert VALUE to a gdb_mpq. The caller must ensure that VALUE is |
| of floating-point, fixed-point, or integer type. */ |
| extern gdb_mpq value_to_gdb_mpq (struct value *value); |
| |
| #endif /* !defined (VALUE_H) */ |