/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001-2016 Free Software Foundation, Inc.
+ Copyright (C) 2001-2020 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dan@dberlin.org>.
DWARF_VALUE_IMPLICIT_POINTER
};
+/* A piece of an object, as recorded by DW_OP_piece or DW_OP_bit_piece. */
+struct dwarf_expr_piece
+{
+ enum dwarf_value_location location;
+
+ union
+ {
+ struct
+ {
+ /* This piece's address, for DWARF_VALUE_MEMORY pieces. */
+ CORE_ADDR addr;
+ /* Non-zero if the piece is known to be in memory and on
+ the program's stack. */
+ bool in_stack_memory;
+ } mem;
+
+ /* The piece's register number, for DWARF_VALUE_REGISTER pieces. */
+ int regno;
+
+ /* The piece's literal value, for DWARF_VALUE_STACK pieces. */
+ struct value *value;
+
+ struct
+ {
+ /* A pointer to the data making up this piece,
+ for DWARF_VALUE_LITERAL pieces. */
+ const gdb_byte *data;
+ /* The length of the available data. */
+ ULONGEST length;
+ } literal;
+
+ /* Used for DWARF_VALUE_IMPLICIT_POINTER. */
+ struct
+ {
+ /* The referent DIE from DW_OP_implicit_pointer. */
+ sect_offset die_sect_off;
+ /* The byte offset into the resulting data. */
+ LONGEST offset;
+ } ptr;
+ } v;
+
+ /* The length of the piece, in bits. */
+ ULONGEST size;
+ /* The piece offset, in bits. */
+ ULONGEST offset;
+};
+
/* The dwarf expression stack. */
struct dwarf_stack_value
{
+ dwarf_stack_value (struct value *value_, int in_stack_memory_)
+ : value (value_), in_stack_memory (in_stack_memory_)
+ {}
+
struct value *value;
- /* Non-zero if the piece is in memory and is known to be
- on the program's stack. It is always ok to set this to zero.
- This is used, for example, to optimize memory access from the target.
- It can vastly speed up backtraces on long latency connections when
- "set stack-cache on". */
- int in_stack_memory;
+ /* True if the piece is in memory and is known to be on the program's stack.
+ It is always ok to set this to zero. This is used, for example, to
+ optimize memory access from the target. It can vastly speed up backtraces
+ on long latency connections when "set stack-cache on". */
+ bool in_stack_memory;
};
/* The expression evaluator works with a dwarf_expr_context, describing
struct dwarf_expr_context
{
dwarf_expr_context ();
- ~dwarf_expr_context ();
+ virtual ~dwarf_expr_context () = default;
- void push_address (CORE_ADDR value, int in_stack_memory);
+ void push_address (CORE_ADDR value, bool in_stack_memory);
void eval (const gdb_byte *addr, size_t len);
struct value *fetch (int n);
CORE_ADDR fetch_address (int n);
- int fetch_in_stack_memory (int n);
+ bool fetch_in_stack_memory (int n);
- /* The stack of values, allocated with xmalloc. */
- struct dwarf_stack_value *stack;
-
- /* The number of values currently pushed on the stack, and the
- number of elements allocated to the stack. */
- int stack_len, stack_allocated;
+ /* The stack of values. */
+ std::vector<dwarf_stack_value> stack;
/* Target architecture to use for address operations. */
struct gdbarch *gdbarch;
context and operations depending on DW_FORM_ref_addr are not allowed. */
int ref_addr_size;
- /* Offset used to relocate DW_OP_addr and DW_OP_GNU_addr_index arguments. */
+ /* Offset used to relocate DW_OP_addr, DW_OP_addrx, and
+ DW_OP_GNU_addr_index arguments. */
CORE_ADDR offset;
/* The current depth of dwarf expression recursion, via DW_OP_call*,
initialized; zero otherwise. */
int initialized;
- /* An array of pieces. PIECES points to its first element;
- NUM_PIECES is its length.
+ /* A vector of pieces.
Each time DW_OP_piece is executed, we add a new element to the
end of this array, recording the current top of the stack, the
no DW_OP_piece operations have no value to place in a piece's
'size' field; the size comes from the surrounding data. So the
two cases need to be handled separately.) */
- int num_pieces;
- struct dwarf_expr_piece *pieces;
+ std::vector<dwarf_expr_piece> pieces;
/* Return the value of register number REGNUM (a DWARF register number),
read as an address. */
/* Return the PC for the frame. */
virtual CORE_ADDR get_frame_pc ()
{
- error (_("%s is invalid in this context"), "DW_OP_GNU_implicit_pointer");
+ error (_("%s is invalid in this context"), "DW_OP_implicit_pointer");
}
/* Return the thread-local storage address for
virtual CORE_ADDR get_tls_address (CORE_ADDR offset) = 0;
/* Execute DW_AT_location expression for the DWARF expression
- subroutine in the DIE at DIE_OFFSET in the CU. Do not touch
+ subroutine in the DIE at DIE_CU_OFF in the CU. Do not touch
STACK while it being passed to and returned from the called DWARF
subroutine. */
- virtual void dwarf_call (cu_offset die_offset) = 0;
-
- /* Return the base type given by the indicated DIE. This can throw
- an exception if the DIE is invalid or does not represent a base
- type. If can also be NULL in the special case where the
- callbacks are not performing evaluation, and thus it is
- meaningful to substitute a stub type of the correct size. */
- virtual struct type *impl_get_base_type (cu_offset die)
+ virtual void dwarf_call (cu_offset die_cu_off) = 0;
+
+ /* Execute "variable value" operation on the DIE at SECT_OFF. */
+ virtual struct value *dwarf_variable_value (sect_offset sect_off) = 0;
+
+ /* Return the base type given by the indicated DIE at DIE_CU_OFF.
+ This can throw an exception if the DIE is invalid or does not
+ represent a base type. SIZE is non-zero if this function should
+ verify that the resulting type has the correct size. */
+ virtual struct type *get_base_type (cu_offset die_cu_off, int size)
{
/* Anything will do. */
return builtin_type (this->gdbarch)->builtin_int;
}
- /* Push on DWARF stack an entry evaluated for DW_TAG_GNU_call_site's
+ /* Push on DWARF stack an entry evaluated for DW_TAG_call_site's
parameter matching KIND and KIND_U at the caller of specified BATON.
- If DEREF_SIZE is not -1 then use DW_AT_GNU_call_site_data_value instead of
- DW_AT_GNU_call_site_value. */
+ If DEREF_SIZE is not -1 then use DW_AT_call_data_value instead of
+ DW_AT_call_value. */
virtual void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
union call_site_parameter_u kind_u,
int deref_size) = 0;
- /* Return the address indexed by DW_OP_GNU_addr_index.
+ /* Return the address indexed by DW_OP_addrx or DW_OP_GNU_addr_index.
This can throw an exception if the index is out of range. */
virtual CORE_ADDR get_addr_index (unsigned int index) = 0;
private:
struct type *address_type () const;
- void grow_stack (size_t need);
- void push (struct value *value, int in_stack_memory);
- int stack_empty_p () const;
+ void push (struct value *value, bool in_stack_memory);
+ bool stack_empty_p () const;
void add_piece (ULONGEST size, ULONGEST offset);
- struct type *get_base_type (cu_offset die, int size);
void execute_stack_op (const gdb_byte *op_ptr, const gdb_byte *op_end);
void pop ();
};
-
-/* A piece of an object, as recorded by DW_OP_piece or DW_OP_bit_piece. */
-struct dwarf_expr_piece
-{
- enum dwarf_value_location location;
-
- union
- {
- struct
- {
- /* This piece's address, for DWARF_VALUE_MEMORY pieces. */
- CORE_ADDR addr;
- /* Non-zero if the piece is known to be in memory and on
- the program's stack. */
- int in_stack_memory;
- } mem;
-
- /* The piece's register number, for DWARF_VALUE_REGISTER pieces. */
- int regno;
-
- /* The piece's literal value, for DWARF_VALUE_STACK pieces. */
- struct value *value;
-
- struct
- {
- /* A pointer to the data making up this piece,
- for DWARF_VALUE_LITERAL pieces. */
- const gdb_byte *data;
- /* The length of the available data. */
- ULONGEST length;
- } literal;
-
- /* Used for DWARF_VALUE_IMPLICIT_POINTER. */
- struct
- {
- /* The referent DIE from DW_OP_GNU_implicit_pointer. */
- sect_offset die;
- /* The byte offset into the resulting data. */
- LONGEST offset;
- } ptr;
- } v;
-
- /* The length of the piece, in bits. */
- ULONGEST size;
- /* The piece offset, in bits. */
- ULONGEST offset;
-};
-
void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *,
const char *);
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