/* DWARF 2 location expression support for GDB.
- Copyright (C) 2003-2017 Free Software Foundation, Inc.
+ Copyright (C) 2003-2018 Free Software Foundation, Inc.
Contributed by Daniel Jacobowitz, MontaVista Software, Inc.
union call_site_parameter_u kind_u,
struct dwarf2_per_cu_data **per_cu_return);
+static struct value *indirect_synthetic_pointer
+ (sect_offset die, LONGEST byte_offset,
+ struct dwarf2_per_cu_data *per_cu,
+ struct frame_info *frame,
+ struct type *type, bool resolve_abstract_p = false);
+
/* Until these have formal names, we define these here.
ref: http://gcc.gnu.org/wiki/DebugFission
Each entry in .debug_loc.dwo begins with a byte that describes the entry,
if (pc_block)
pc_func = block_linkage_function (pc_block);
- if (pc_func && pc == BLOCK_START (SYMBOL_BLOCK_VALUE (pc_func)))
+ if (pc_func && pc == BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (pc_func)))
{
*locexpr_length = length;
return loc_ptr;
ctx->eval (block.data, block.size);
}
+/* Given context CTX, section offset SECT_OFF, and compilation unit
+ data PER_CU, execute the "variable value" operation on the DIE
+ found at SECT_OFF. */
+
+static struct value *
+sect_variable_value (struct dwarf_expr_context *ctx, sect_offset sect_off,
+ struct dwarf2_per_cu_data *per_cu)
+{
+ struct type *die_type = dwarf2_fetch_die_type_sect_off (sect_off, per_cu);
+
+ if (die_type == NULL)
+ error (_("Bad DW_OP_GNU_variable_value DIE."));
+
+ /* Note: Things still work when the following test is removed. This
+ test and error is here to conform to the proposed specification. */
+ if (TYPE_CODE (die_type) != TYPE_CODE_INT
+ && TYPE_CODE (die_type) != TYPE_CODE_PTR)
+ error (_("Type of DW_OP_GNU_variable_value DIE must be an integer or pointer."));
+
+ struct type *type = lookup_pointer_type (die_type);
+ struct frame_info *frame = get_selected_frame (_("No frame selected."));
+ return indirect_synthetic_pointer (sect_off, 0, per_cu, frame, type, true);
+}
+
class dwarf_evaluate_loc_desc : public dwarf_expr_context
{
public:
/* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for
the frame in BATON. */
- CORE_ADDR get_frame_cfa () OVERRIDE
+ CORE_ADDR get_frame_cfa () override
{
return dwarf2_frame_cfa (frame);
}
/* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for
the frame in BATON. */
- CORE_ADDR get_frame_pc () OVERRIDE
+ CORE_ADDR get_frame_pc () override
{
return get_frame_address_in_block (frame);
}
/* Using the objfile specified in BATON, find the address for the
current thread's thread-local storage with offset OFFSET. */
- CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE
+ CORE_ADDR get_tls_address (CORE_ADDR offset) override
{
struct objfile *objfile = dwarf2_per_cu_objfile (per_cu);
/* Helper interface of per_cu_dwarf_call for
dwarf2_evaluate_loc_desc. */
- void dwarf_call (cu_offset die_offset) OVERRIDE
+ void dwarf_call (cu_offset die_offset) override
{
per_cu_dwarf_call (this, die_offset, per_cu);
}
- struct type *get_base_type (cu_offset die_offset, int size) OVERRIDE
+ /* Helper interface of sect_variable_value for
+ dwarf2_evaluate_loc_desc. */
+
+ struct value *dwarf_variable_value (sect_offset sect_off) override
+ {
+ return sect_variable_value (this, sect_off, per_cu);
+ }
+
+ struct type *get_base_type (cu_offset die_offset, int size) override
{
struct type *result = dwarf2_get_die_type (die_offset, per_cu);
if (result == NULL)
/* Callback function for dwarf2_evaluate_loc_desc.
Fetch the address indexed by DW_OP_GNU_addr_index. */
- CORE_ADDR get_addr_index (unsigned int index) OVERRIDE
+ CORE_ADDR get_addr_index (unsigned int index) override
{
return dwarf2_read_addr_index (per_cu, index);
}
/* Callback function for get_object_address. Return the address of the VLA
object. */
- CORE_ADDR get_object_address () OVERRIDE
+ CORE_ADDR get_object_address () override
{
if (obj_address == 0)
error (_("Location address is not set."));
void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
union call_site_parameter_u kind_u,
- int deref_size) OVERRIDE
+ int deref_size) override
{
struct frame_info *caller_frame;
struct dwarf2_per_cu_data *caller_per_cu;
/* Using the frame specified in BATON, find the location expression
describing the frame base. Return a pointer to it in START and
its length in LENGTH. */
- void get_frame_base (const gdb_byte **start, size_t * length) OVERRIDE
+ void get_frame_base (const gdb_byte **start, size_t * length) override
{
/* FIXME: cagney/2003-03-26: This code should be using
get_frame_base_address(), and then implement a dwarf2 specific
/* Read memory at ADDR (length LEN) into BUF. */
- void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE
+ void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override
{
read_memory (addr, buf, len);
}
/* Using the frame specified in BATON, return the value of register
REGNUM, treated as a pointer. */
- CORE_ADDR read_addr_from_reg (int dwarf_regnum) OVERRIDE
+ CORE_ADDR read_addr_from_reg (int dwarf_regnum) override
{
struct gdbarch *gdbarch = get_frame_arch (frame);
int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum);
/* Implement "get_reg_value" callback. */
- struct value *get_reg_value (struct type *type, int dwarf_regnum) OVERRIDE
+ struct value *get_reg_value (struct type *type, int dwarf_regnum) override
{
struct gdbarch *gdbarch = get_frame_arch (frame);
int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum);
struct symbol *sym = find_pc_function (addr);
struct type *type;
- if (sym == NULL || BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) != addr)
+ if (sym == NULL || BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (sym)) != addr)
throw_error (NO_ENTRY_VALUE_ERROR,
_("DW_TAG_call_site resolving failed to find function "
"name for address %s"),
{
struct value *target_val = (struct value *) value_computed_closure (v);
- value_free (target_val);
+ value_decref (target_val);
}
/* Vector for methods for an entry value reference where the referenced value
target_type, caller_frame,
caller_per_cu);
- release_value (target_val);
+ release_value (target_val).release ();
val = allocate_computed_value (type, &entry_data_value_funcs,
target_val /* closure */);
struct piece_closure
{
/* Reference count. */
- int refc;
+ int refc = 0;
/* The CU from which this closure's expression came. */
- struct dwarf2_per_cu_data *per_cu;
+ struct dwarf2_per_cu_data *per_cu = NULL;
- /* The number of pieces used to describe this variable. */
- int n_pieces;
-
- /* The pieces themselves. */
- struct dwarf_expr_piece *pieces;
+ /* The pieces describing this variable. */
+ std::vector<dwarf_expr_piece> pieces;
/* Frame ID of frame to which a register value is relative, used
only by DWARF_VALUE_REGISTER. */
static struct piece_closure *
allocate_piece_closure (struct dwarf2_per_cu_data *per_cu,
- int n_pieces, struct dwarf_expr_piece *pieces,
+ std::vector<dwarf_expr_piece> &&pieces,
struct frame_info *frame)
{
- struct piece_closure *c = XCNEW (struct piece_closure);
- int i;
+ struct piece_closure *c = new piece_closure;
c->refc = 1;
c->per_cu = per_cu;
- c->n_pieces = n_pieces;
- c->pieces = XCNEWVEC (struct dwarf_expr_piece, n_pieces);
+ c->pieces = std::move (pieces);
if (frame == NULL)
c->frame_id = null_frame_id;
else
c->frame_id = get_frame_id (frame);
- memcpy (c->pieces, pieces, n_pieces * sizeof (struct dwarf_expr_piece));
- for (i = 0; i < n_pieces; ++i)
- if (c->pieces[i].location == DWARF_VALUE_STACK)
- value_incref (c->pieces[i].v.value);
+ for (dwarf_expr_piece &piece : c->pieces)
+ if (piece.location == DWARF_VALUE_STACK)
+ value_incref (piece.v.value);
return c;
}
max_offset = 8 * TYPE_LENGTH (value_type (v));
/* Advance to the first non-skipped piece. */
- for (i = 0; i < c->n_pieces && bits_to_skip >= c->pieces[i].size; i++)
+ for (i = 0; i < c->pieces.size () && bits_to_skip >= c->pieces[i].size; i++)
bits_to_skip -= c->pieces[i].size;
- for (; i < c->n_pieces && offset < max_offset; i++)
+ for (; i < c->pieces.size () && offset < max_offset; i++)
{
struct dwarf_expr_piece *p = &c->pieces[i];
size_t this_size_bits, this_size;
if (value_bitsize (value))
bit_offset += value_bitpos (value);
- for (i = 0; i < c->n_pieces && bit_length > 0; i++)
+ for (i = 0; i < c->pieces.size () && bit_length > 0; i++)
{
struct dwarf_expr_piece *p = &c->pieces[i];
size_t this_size_bits = p->size;
static struct value *
indirect_synthetic_pointer (sect_offset die, LONGEST byte_offset,
struct dwarf2_per_cu_data *per_cu,
- struct frame_info *frame, struct type *type)
+ struct frame_info *frame, struct type *type,
+ bool resolve_abstract_p)
{
/* Fetch the location expression of the DIE we're pointing to. */
struct dwarf2_locexpr_baton baton
= dwarf2_fetch_die_loc_sect_off (die, per_cu,
- get_frame_address_in_block_wrapper, frame);
+ get_frame_address_in_block_wrapper, frame,
+ resolve_abstract_p);
/* Get type of pointed-to DIE. */
struct type *orig_type = dwarf2_fetch_die_type_sect_off (die, per_cu);
= (struct piece_closure *) value_computed_closure (value);
struct type *type;
struct frame_info *frame;
- struct dwarf2_locexpr_baton baton;
int i, bit_length;
LONGEST bit_offset;
struct dwarf_expr_piece *piece = NULL;
if (value_bitsize (value))
bit_offset += value_bitpos (value);
- for (i = 0; i < c->n_pieces && bit_length > 0; i++)
+ for (i = 0; i < c->pieces.size () && bit_length > 0; i++)
{
struct dwarf_expr_piece *p = &c->pieces[i];
size_t this_size_bits = p->size;
/* gdb represents synthetic pointers as pieced values with a single
piece. */
gdb_assert (closure != NULL);
- gdb_assert (closure->n_pieces == 1);
+ gdb_assert (closure->pieces.size () == 1);
- return indirect_synthetic_pointer (closure->pieces->v.ptr.die_sect_off,
- closure->pieces->v.ptr.offset,
- closure->per_cu, frame, type);
+ return indirect_synthetic_pointer
+ (closure->pieces[0].v.ptr.die_sect_off,
+ closure->pieces[0].v.ptr.offset,
+ closure->per_cu, frame, type);
}
else
{
--c->refc;
if (c->refc == 0)
{
- int i;
-
- for (i = 0; i < c->n_pieces; ++i)
- if (c->pieces[i].location == DWARF_VALUE_STACK)
- value_free (c->pieces[i].v.value);
+ for (dwarf_expr_piece &p : c->pieces)
+ if (p.location == DWARF_VALUE_STACK)
+ value_decref (p.v.value);
- xfree (c->pieces);
- xfree (c);
+ delete c;
}
}
}
END_CATCH
- if (ctx.num_pieces > 0)
+ if (ctx.pieces.size () > 0)
{
struct piece_closure *c;
ULONGEST bit_size = 0;
- int i;
- for (i = 0; i < ctx.num_pieces; ++i)
- bit_size += ctx.pieces[i].size;
+ for (dwarf_expr_piece &piece : ctx.pieces)
+ bit_size += piece.size;
/* Complain if the expression is larger than the size of the
outer type. */
if (bit_size > 8 * TYPE_LENGTH (type))
invalid_synthetic_pointer ();
- c = allocate_piece_closure (per_cu, ctx.num_pieces, ctx.pieces,
- frame);
+ c = allocate_piece_closure (per_cu, std::move (ctx.pieces), frame);
/* We must clean up the value chain after creating the piece
closure but before allocating the result. */
free_values.free_to_mark ();
{
struct type *ptr_type;
CORE_ADDR address = ctx.fetch_address (0);
- int in_stack_memory = ctx.fetch_in_stack_memory (0);
+ bool in_stack_memory = ctx.fetch_in_stack_memory (0);
/* DW_OP_deref_size (and possibly other operations too) may
create a pointer instead of an address. Ideally, the
size_t len = TYPE_LENGTH (subobj_type);
size_t max = TYPE_LENGTH (type);
struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile);
- struct cleanup *cleanup;
if (subobj_byte_offset + len > max)
invalid_synthetic_pointer ();
/* Preserve VALUE because we are going to free values back
to the mark, but we still need the value contents
below. */
- value_incref (value);
+ value_ref_ptr value_holder = value_ref_ptr::new_reference (value);
free_values.free_to_mark ();
- cleanup = make_cleanup_value_free (value);
retval = allocate_value (subobj_type);
memcpy (value_contents_raw (retval),
value_contents_all (value) + subobj_byte_offset, len);
-
- do_cleanups (cleanup);
}
break;
ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (dlbaton->per_cu);
ctx.offset = dwarf2_per_cu_text_offset (dlbaton->per_cu);
- ctx.eval (dlbaton->data, dlbaton->size);
+ TRY
+ {
+ ctx.eval (dlbaton->data, dlbaton->size);
+ }
+ CATCH (ex, RETURN_MASK_ERROR)
+ {
+ if (ex.error == NOT_AVAILABLE_ERROR)
+ {
+ return 0;
+ }
+ else if (ex.error == NO_ENTRY_VALUE_ERROR)
+ {
+ if (entry_values_debug)
+ exception_print (gdb_stdout, ex);
+ return 0;
+ }
+ else
+ throw_exception (ex);
+ }
+ END_CATCH
switch (ctx.location)
{
/* See dwarf2loc.h. */
void
-dwarf2_compile_property_to_c (string_file &stream,
+dwarf2_compile_property_to_c (string_file *stream,
const char *result_name,
struct gdbarch *gdbarch,
unsigned char *registers_used,
struct dwarf2_per_cu_data *per_cu;
/* Reads from registers do require a frame. */
- CORE_ADDR read_addr_from_reg (int regnum) OVERRIDE
+ CORE_ADDR read_addr_from_reg (int regnum) override
{
needs = SYMBOL_NEEDS_FRAME;
return 1;
/* "get_reg_value" callback: Reads from registers do require a
frame. */
- struct value *get_reg_value (struct type *type, int regnum) OVERRIDE
+ struct value *get_reg_value (struct type *type, int regnum) override
{
needs = SYMBOL_NEEDS_FRAME;
return value_zero (type, not_lval);
}
/* Reads from memory do not require a frame. */
- void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE
+ void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override
{
memset (buf, 0, len);
}
/* Frame-relative accesses do require a frame. */
- void get_frame_base (const gdb_byte **start, size_t *length) OVERRIDE
+ void get_frame_base (const gdb_byte **start, size_t *length) override
{
static gdb_byte lit0 = DW_OP_lit0;
}
/* CFA accesses require a frame. */
- CORE_ADDR get_frame_cfa () OVERRIDE
+ CORE_ADDR get_frame_cfa () override
{
needs = SYMBOL_NEEDS_FRAME;
return 1;
}
- CORE_ADDR get_frame_pc () OVERRIDE
+ CORE_ADDR get_frame_pc () override
{
needs = SYMBOL_NEEDS_FRAME;
return 1;
}
/* Thread-local accesses require registers, but not a frame. */
- CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE
+ CORE_ADDR get_tls_address (CORE_ADDR offset) override
{
if (needs <= SYMBOL_NEEDS_REGISTERS)
needs = SYMBOL_NEEDS_REGISTERS;
/* Helper interface of per_cu_dwarf_call for
dwarf2_loc_desc_get_symbol_read_needs. */
- void dwarf_call (cu_offset die_offset) OVERRIDE
+ void dwarf_call (cu_offset die_offset) override
{
per_cu_dwarf_call (this, die_offset, per_cu);
}
+ /* Helper interface of sect_variable_value for
+ dwarf2_loc_desc_get_symbol_read_needs. */
+
+ struct value *dwarf_variable_value (sect_offset sect_off) override
+ {
+ return sect_variable_value (this, sect_off, per_cu);
+ }
+
/* DW_OP_entry_value accesses require a caller, therefore a
frame. */
void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
union call_site_parameter_u kind_u,
- int deref_size) OVERRIDE
+ int deref_size) override
{
needs = SYMBOL_NEEDS_FRAME;
/* DW_OP_GNU_addr_index doesn't require a frame. */
- CORE_ADDR get_addr_index (unsigned int index) OVERRIDE
+ CORE_ADDR get_addr_index (unsigned int index) override
{
/* Nothing to do. */
return 1;
/* DW_OP_push_object_address has a frame already passed through. */
- CORE_ADDR get_object_address () OVERRIDE
+ CORE_ADDR get_object_address () override
{
/* Nothing to do. */
return 1;
in_reg = ctx.location == DWARF_VALUE_REGISTER;
- if (ctx.num_pieces > 0)
- {
- int i;
-
- /* If the location has several pieces, and any of them are in
- registers, then we will need a frame to fetch them from. */
- for (i = 0; i < ctx.num_pieces; i++)
- if (ctx.pieces[i].location == DWARF_VALUE_REGISTER)
- in_reg = 1;
- }
+ /* If the location has several pieces, and any of them are in
+ registers, then we will need a frame to fetch them from. */
+ for (dwarf_expr_piece &p : ctx.pieces)
+ if (p.location == DWARF_VALUE_REGISTER)
+ in_reg = 1;
if (in_reg)
ctx.needs = SYMBOL_NEEDS_FRAME;
/* A helper function that throws an unimplemented error mentioning a
given DWARF operator. */
-static void
+static void ATTRIBUTE_NORETURN
unimplemented (unsigned int op)
{
const char *name = get_DW_OP_name (op);
if (reg == -1)
{
- complaint (&symfile_complaints,
- _("bad DWARF register number %d"), dwarf_reg);
+ complaint (_("bad DWARF register number %d"), dwarf_reg);
}
return reg;
}
void
dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc,
- struct gdbarch *arch, unsigned int addr_size,
- const gdb_byte *op_ptr, const gdb_byte *op_end,
+ unsigned int addr_size, const gdb_byte *op_ptr,
+ const gdb_byte *op_end,
struct dwarf2_per_cu_data *per_cu)
{
+ gdbarch *arch = expr->gdbarch;
int i;
std::vector<int> dw_labels, patches;
const gdb_byte * const base = op_ptr;
&datastart, &datalen);
op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
- dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, datastart,
+ dwarf2_compile_expr_to_ax (expr, loc, addr_size, datastart,
datastart + datalen, per_cu);
if (loc->kind == axs_lvalue_register)
require_rvalue (expr, loc);
{
/* Another expression. */
ax_const_l (expr, text_offset);
- dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size,
- cfa_start, cfa_end, per_cu);
+ dwarf2_compile_expr_to_ax (expr, loc, addr_size, cfa_start,
+ cfa_end, per_cu);
}
loc->kind = axs_lvalue_memory;
/* DW_OP_call_ref is currently not supported. */
gdb_assert (block.per_cu == per_cu);
- dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size,
- block.data, block.data + block.size,
- per_cu);
+ dwarf2_compile_expr_to_ax (expr, loc, addr_size, block.data,
+ block.data + block.size, per_cu);
}
break;
case DW_OP_call_ref:
unimplemented (op);
+ case DW_OP_GNU_variable_value:
+ unimplemented (op);
+
default:
unimplemented (op);
}
ul = dwarf2_read_addr_index (per_cu, ul);
fprintf_filtered (stream, " %s", pulongest (ul));
break;
+
+ case DW_OP_GNU_variable_value:
+ ul = extract_unsigned_integer (data, offset_size,
+ gdbarch_byte_order (arch));
+ data += offset_size;
+ fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size));
+ break;
}
fprintf_filtered (stream, "\n");
any necessary bytecode in AX. */
static void
-locexpr_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
- struct agent_expr *ax, struct axs_value *value)
+locexpr_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax,
+ struct axs_value *value)
{
struct dwarf2_locexpr_baton *dlbaton
= (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol);
if (dlbaton->size == 0)
value->optimized_out = 1;
else
- dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size,
- dlbaton->data, dlbaton->data + dlbaton->size,
- dlbaton->per_cu);
+ dwarf2_compile_expr_to_ax (ax, value, addr_size, dlbaton->data,
+ dlbaton->data + dlbaton->size, dlbaton->per_cu);
}
/* symbol_computed_ops 'generate_c_location' method. */
static void
-locexpr_generate_c_location (struct symbol *sym, string_file &stream,
+locexpr_generate_c_location (struct symbol *sym, string_file *stream,
struct gdbarch *gdbarch,
unsigned char *registers_used,
CORE_ADDR pc, const char *result_name)
/* Describe the location of SYMBOL as an agent value in VALUE, generating
any necessary bytecode in AX. */
static void
-loclist_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
- struct agent_expr *ax, struct axs_value *value)
+loclist_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax,
+ struct axs_value *value)
{
struct dwarf2_loclist_baton *dlbaton
= (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol);
if (size == 0)
value->optimized_out = 1;
else
- dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, data, data + size,
+ dwarf2_compile_expr_to_ax (ax, value, addr_size, data, data + size,
dlbaton->per_cu);
}
/* symbol_computed_ops 'generate_c_location' method. */
static void
-loclist_generate_c_location (struct symbol *sym, string_file &stream,
+loclist_generate_c_location (struct symbol *sym, string_file *stream,
struct gdbarch *gdbarch,
unsigned char *registers_used,
CORE_ADDR pc, const char *result_name)
loclist_generate_c_location
};
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern initialize_file_ftype _initialize_dwarf2loc;
-
void
_initialize_dwarf2loc (void)
{
&setdebuglist, &showdebuglist);
#if GDB_SELF_TEST
- register_self_test (selftests::copy_bitwise_tests);
+ selftests::register_test ("copy_bitwise", selftests::copy_bitwise_tests);
#endif
}
projects / deliverable / binutils-gdb.git / blobdiff