/* DWARF 2 location expression support for GDB.
- Copyright (C) 2003, 2005, 2007-2012 Free Software Foundation, Inc.
+ Copyright (C) 2003-2019 Free Software Foundation, Inc.
Contributed by Daniel Jacobowitz, MontaVista Software, Inc.
#include "ax-gdb.h"
#include "regcache.h"
#include "objfiles.h"
-#include "exceptions.h"
#include "block.h"
#include "gdbcmd.h"
-
+#include "complaints.h"
#include "dwarf2.h"
#include "dwarf2expr.h"
#include "dwarf2loc.h"
+#include "dwarf2read.h"
#include "dwarf2-frame.h"
-
-#include "gdb_string.h"
-#include "gdb_assert.h"
-
-DEF_VEC_I(int);
-
-extern int dwarf2_always_disassemble;
-
-static void dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc,
- const gdb_byte **start, size_t *length);
-
-static const struct dwarf_expr_context_funcs dwarf_expr_ctx_funcs;
+#include "compile/compile.h"
+#include "gdbsupport/selftest.h"
+#include <algorithm>
+#include <vector>
+#include <unordered_set>
+#include "gdbsupport/underlying.h"
+#include "gdbsupport/byte-vector.h"
static struct value *dwarf2_evaluate_loc_desc_full (struct type *type,
struct frame_info *frame,
const gdb_byte *data,
- unsigned short size,
- struct dwarf2_per_cu_data *per_cu,
- LONGEST byte_offset);
+ size_t size,
+ struct dwarf2_per_cu_data *per_cu,
+ struct type *subobj_type,
+ LONGEST subobj_byte_offset);
+
+static struct call_site_parameter *dwarf_expr_reg_to_entry_parameter
+ (struct frame_info *frame,
+ enum call_site_parameter_kind kind,
+ 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
/* This is followed by two unsigned LEB128 numbers that are indices into
.debug_addr and specify the beginning and ending addresses, and then
a normal location expression as in .debug_loc. */
- DEBUG_LOC_NORMAL = 2,
+ DEBUG_LOC_START_END = 2,
+
+ /* This is followed by an unsigned LEB128 number that is an index into
+ .debug_addr and specifies the beginning address, and a 4 byte unsigned
+ number that specifies the length, and then a normal location expression
+ as in .debug_loc. */
+ DEBUG_LOC_START_LENGTH = 3,
/* An internal value indicating there is insufficient data. */
DEBUG_LOC_BUFFER_OVERFLOW = -1,
DEBUG_LOC_INVALID_ENTRY = -2
};
+/* Helper function which throws an error if a synthetic pointer is
+ invalid. */
+
+static void
+invalid_synthetic_pointer (void)
+{
+ error (_("access outside bounds of object "
+ "referenced via synthetic pointer"));
+}
+
/* Decode the addresses in a non-dwo .debug_loc entry.
A pointer to the next byte to examine is returned in *NEW_PTR.
The encoded low,high addresses are return in *LOW,*HIGH.
if (*low == 0 && *high == 0)
return DEBUG_LOC_END_OF_LIST;
- return DEBUG_LOC_NORMAL;
+ return DEBUG_LOC_START_END;
+}
+
+/* Decode the addresses in .debug_loclists entry.
+ A pointer to the next byte to examine is returned in *NEW_PTR.
+ The encoded low,high addresses are return in *LOW,*HIGH.
+ The result indicates the kind of entry found. */
+
+static enum debug_loc_kind
+decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu,
+ const gdb_byte *loc_ptr,
+ const gdb_byte *buf_end,
+ const gdb_byte **new_ptr,
+ CORE_ADDR *low, CORE_ADDR *high,
+ enum bfd_endian byte_order,
+ unsigned int addr_size,
+ int signed_addr_p)
+{
+ uint64_t u64;
+
+ if (loc_ptr == buf_end)
+ return DEBUG_LOC_BUFFER_OVERFLOW;
+
+ switch (*loc_ptr++)
+ {
+ case DW_LLE_end_of_list:
+ *new_ptr = loc_ptr;
+ return DEBUG_LOC_END_OF_LIST;
+ case DW_LLE_base_address:
+ if (loc_ptr + addr_size > buf_end)
+ return DEBUG_LOC_BUFFER_OVERFLOW;
+ if (signed_addr_p)
+ *high = extract_signed_integer (loc_ptr, addr_size, byte_order);
+ else
+ *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
+ loc_ptr += addr_size;
+ *new_ptr = loc_ptr;
+ return DEBUG_LOC_BASE_ADDRESS;
+ case DW_LLE_offset_pair:
+ loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64);
+ if (loc_ptr == NULL)
+ return DEBUG_LOC_BUFFER_OVERFLOW;
+ *low = u64;
+ loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64);
+ if (loc_ptr == NULL)
+ return DEBUG_LOC_BUFFER_OVERFLOW;
+ *high = u64;
+ *new_ptr = loc_ptr;
+ return DEBUG_LOC_START_END;
+ default:
+ return DEBUG_LOC_INVALID_ENTRY;
+ }
}
/* Decode the addresses in .debug_loc.dwo entry.
const gdb_byte *loc_ptr,
const gdb_byte *buf_end,
const gdb_byte **new_ptr,
- CORE_ADDR *low, CORE_ADDR *high)
+ CORE_ADDR *low, CORE_ADDR *high,
+ enum bfd_endian byte_order)
{
- unsigned long long low_index, high_index;
+ uint64_t low_index, high_index;
if (loc_ptr == buf_end)
return DEBUG_LOC_BUFFER_OVERFLOW;
switch (*loc_ptr++)
{
- case DEBUG_LOC_END_OF_LIST:
+ case DW_LLE_GNU_end_of_list_entry:
*new_ptr = loc_ptr;
return DEBUG_LOC_END_OF_LIST;
- case DEBUG_LOC_BASE_ADDRESS:
+ case DW_LLE_GNU_base_address_selection_entry:
*low = 0;
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index);
if (loc_ptr == NULL)
*high = dwarf2_read_addr_index (per_cu, high_index);
*new_ptr = loc_ptr;
return DEBUG_LOC_BASE_ADDRESS;
- case DEBUG_LOC_NORMAL:
+ case DW_LLE_GNU_start_end_entry:
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index);
if (loc_ptr == NULL)
return DEBUG_LOC_BUFFER_OVERFLOW;
return DEBUG_LOC_BUFFER_OVERFLOW;
*high = dwarf2_read_addr_index (per_cu, high_index);
*new_ptr = loc_ptr;
- return DEBUG_LOC_NORMAL;
+ return DEBUG_LOC_START_END;
+ case DW_LLE_GNU_start_length_entry:
+ loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index);
+ if (loc_ptr == NULL)
+ return DEBUG_LOC_BUFFER_OVERFLOW;
+ *low = dwarf2_read_addr_index (per_cu, low_index);
+ if (loc_ptr + 4 > buf_end)
+ return DEBUG_LOC_BUFFER_OVERFLOW;
+ *high = *low;
+ *high += extract_unsigned_integer (loc_ptr, 4, byte_order);
+ *new_ptr = loc_ptr + 4;
+ return DEBUG_LOC_START_LENGTH;
default:
return DEBUG_LOC_INVALID_ENTRY;
}
if (baton->from_dwo)
kind = decode_debug_loc_dwo_addresses (baton->per_cu,
loc_ptr, buf_end, &new_ptr,
- &low, &high);
- else
+ &low, &high, byte_order);
+ else if (dwarf2_version (baton->per_cu) < 5)
kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr,
&low, &high,
byte_order, addr_size,
signed_addr_p);
+ else
+ kind = decode_debug_loclists_addresses (baton->per_cu,
+ loc_ptr, buf_end, &new_ptr,
+ &low, &high, byte_order,
+ addr_size, signed_addr_p);
+
loc_ptr = new_ptr;
switch (kind)
{
case DEBUG_LOC_BASE_ADDRESS:
base_address = high + base_offset;
continue;
- case DEBUG_LOC_NORMAL:
+ case DEBUG_LOC_START_END:
+ case DEBUG_LOC_START_LENGTH:
break;
case DEBUG_LOC_BUFFER_OVERFLOW:
case DEBUG_LOC_INVALID_ENTRY:
gdb_assert_not_reached ("bad debug_loc_kind");
}
- /* Otherwise, a location expression entry. */
- low += base_address;
- high += base_address;
+ /* Otherwise, a location expression entry.
+ If the entry is from a DWO, don't add base address: the entry is from
+ .debug_addr which already has the DWARF "base address". We still add
+ base_offset in case we're debugging a PIE executable. */
+ if (baton->from_dwo)
+ {
+ low += base_offset;
+ high += base_offset;
+ }
+ else
+ {
+ low += base_address;
+ high += base_address;
+ }
- length = extract_unsigned_integer (loc_ptr, 2, byte_order);
- loc_ptr += 2;
+ if (dwarf2_version (baton->per_cu) < 5)
+ {
+ length = extract_unsigned_integer (loc_ptr, 2, byte_order);
+ loc_ptr += 2;
+ }
+ else
+ {
+ unsigned int bytes_read;
+
+ length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read);
+ loc_ptr += bytes_read;
+ }
if (low == high && pc == low)
{
/* This is entry PC record present only at entry point
of a function. Verify it is really the function entry point. */
- struct block *pc_block = block_for_pc (pc);
+ const struct block *pc_block = block_for_pc (pc);
struct symbol *pc_func = NULL;
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;
{
struct frame_info *frame;
struct dwarf2_per_cu_data *per_cu;
+ CORE_ADDR obj_address;
};
-/* Helper functions for dwarf2_evaluate_loc_desc. */
+/* Implement find_frame_base_location method for LOC_BLOCK functions using
+ DWARF expression for its DW_AT_frame_base. */
-/* Using the frame specified in BATON, return the value of register
- REGNUM, treated as a pointer. */
-static CORE_ADDR
-dwarf_expr_read_reg (void *baton, int dwarf_regnum)
+static void
+locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc,
+ const gdb_byte **start, size_t *length)
{
- struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
- struct gdbarch *gdbarch = get_frame_arch (debaton->frame);
- CORE_ADDR result;
- int regnum;
+ struct dwarf2_locexpr_baton *symbaton
+ = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc);
- regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_regnum);
- result = address_from_register (builtin_type (gdbarch)->builtin_data_ptr,
- regnum, debaton->frame);
- return result;
+ *length = symbaton->size;
+ *start = symbaton->data;
}
-/* Read memory at ADDR (length LEN) into BUF. */
+/* Implement the struct symbol_block_ops::get_frame_base method for
+ LOC_BLOCK functions using a DWARF expression as its DW_AT_frame_base. */
-static void
-dwarf_expr_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len)
+static CORE_ADDR
+locexpr_get_frame_base (struct symbol *framefunc, struct frame_info *frame)
{
- read_memory (addr, buf, len);
+ struct gdbarch *gdbarch;
+ struct type *type;
+ struct dwarf2_locexpr_baton *dlbaton;
+ const gdb_byte *start;
+ size_t length;
+ struct value *result;
+
+ /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block.
+ Thus, it's supposed to provide the find_frame_base_location method as
+ well. */
+ gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL);
+
+ gdbarch = get_frame_arch (frame);
+ type = builtin_type (gdbarch)->builtin_data_ptr;
+ dlbaton = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc);
+
+ SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location
+ (framefunc, get_frame_pc (frame), &start, &length);
+ result = dwarf2_evaluate_loc_desc (type, frame, start, length,
+ dlbaton->per_cu);
+
+ /* The DW_AT_frame_base attribute contains a location description which
+ computes the base address itself. However, the call to
+ dwarf2_evaluate_loc_desc returns a value representing a variable at
+ that address. The frame base address is thus this variable's
+ address. */
+ return value_address (result);
}
-/* 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. */
-static void
-dwarf_expr_frame_base (void *baton, const gdb_byte **start, size_t * length)
-{
- /* FIXME: cagney/2003-03-26: This code should be using
- get_frame_base_address(), and then implement a dwarf2 specific
- this_base method. */
- struct symbol *framefunc;
- struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
-
- /* Use block_linkage_function, which returns a real (not inlined)
- function, instead of get_frame_function, which may return an
- inlined function. */
- framefunc = block_linkage_function (get_frame_block (debaton->frame, NULL));
+/* Vector for inferior functions as represented by LOC_BLOCK, if the inferior
+ function uses DWARF expression for its DW_AT_frame_base. */
- /* If we found a frame-relative symbol then it was certainly within
- some function associated with a frame. If we can't find the frame,
- something has gone wrong. */
- gdb_assert (framefunc != NULL);
+const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs =
+{
+ locexpr_find_frame_base_location,
+ locexpr_get_frame_base
+};
- dwarf_expr_frame_base_1 (framefunc,
- get_frame_address_in_block (debaton->frame),
- start, length);
-}
+/* Implement find_frame_base_location method for LOC_BLOCK functions using
+ DWARF location list for its DW_AT_frame_base. */
static void
-dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc,
- const gdb_byte **start, size_t *length)
+loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc,
+ const gdb_byte **start, size_t *length)
{
- if (SYMBOL_LOCATION_BATON (framefunc) == NULL)
- *length = 0;
- else if (SYMBOL_COMPUTED_OPS (framefunc) == &dwarf2_loclist_funcs)
- {
- struct dwarf2_loclist_baton *symbaton;
-
- symbaton = SYMBOL_LOCATION_BATON (framefunc);
- *start = dwarf2_find_location_expression (symbaton, length, pc);
- }
- else
- {
- struct dwarf2_locexpr_baton *symbaton;
-
- symbaton = SYMBOL_LOCATION_BATON (framefunc);
- if (symbaton != NULL)
- {
- *length = symbaton->size;
- *start = symbaton->data;
- }
- else
- *length = 0;
- }
+ struct dwarf2_loclist_baton *symbaton
+ = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc);
- if (*length == 0)
- error (_("Could not find the frame base for \"%s\"."),
- SYMBOL_NATURAL_NAME (framefunc));
+ *start = dwarf2_find_location_expression (symbaton, length, pc);
}
-/* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for
- the frame in BATON. */
+/* Implement the struct symbol_block_ops::get_frame_base method for
+ LOC_BLOCK functions using a DWARF location list as its DW_AT_frame_base. */
static CORE_ADDR
-dwarf_expr_frame_cfa (void *baton)
+loclist_get_frame_base (struct symbol *framefunc, struct frame_info *frame)
{
- struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
-
- return dwarf2_frame_cfa (debaton->frame);
+ struct gdbarch *gdbarch;
+ struct type *type;
+ struct dwarf2_loclist_baton *dlbaton;
+ const gdb_byte *start;
+ size_t length;
+ struct value *result;
+
+ /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block.
+ Thus, it's supposed to provide the find_frame_base_location method as
+ well. */
+ gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL);
+
+ gdbarch = get_frame_arch (frame);
+ type = builtin_type (gdbarch)->builtin_data_ptr;
+ dlbaton = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc);
+
+ SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location
+ (framefunc, get_frame_pc (frame), &start, &length);
+ result = dwarf2_evaluate_loc_desc (type, frame, start, length,
+ dlbaton->per_cu);
+
+ /* The DW_AT_frame_base attribute contains a location description which
+ computes the base address itself. However, the call to
+ dwarf2_evaluate_loc_desc returns a value representing a variable at
+ that address. The frame base address is thus this variable's
+ address. */
+ return value_address (result);
}
-/* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for
- the frame in BATON. */
+/* Vector for inferior functions as represented by LOC_BLOCK, if the inferior
+ function uses DWARF location list for its DW_AT_frame_base. */
-static CORE_ADDR
-dwarf_expr_frame_pc (void *baton)
+const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs =
{
- struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
+ loclist_find_frame_base_location,
+ loclist_get_frame_base
+};
+
+/* See dwarf2loc.h. */
+
+void
+func_get_frame_base_dwarf_block (struct symbol *framefunc, CORE_ADDR pc,
+ const gdb_byte **start, size_t *length)
+{
+ if (SYMBOL_BLOCK_OPS (framefunc) != NULL)
+ {
+ const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc);
- return get_frame_address_in_block (debaton->frame);
+ ops_block->find_frame_base_location (framefunc, pc, start, length);
+ }
+ else
+ *length = 0;
+
+ if (*length == 0)
+ error (_("Could not find the frame base for \"%s\"."),
+ framefunc->natural_name ());
}
-/* Using the objfile specified in BATON, find the address for the
- current thread's thread-local storage with offset OFFSET. */
static CORE_ADDR
-dwarf_expr_tls_address (void *baton, CORE_ADDR offset)
+get_frame_pc_for_per_cu_dwarf_call (void *baton)
{
- struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
- struct objfile *objfile = dwarf2_per_cu_objfile (debaton->per_cu);
+ dwarf_expr_context *ctx = (dwarf_expr_context *) baton;
- return target_translate_tls_address (objfile, offset);
+ return ctx->get_frame_pc ();
}
-/* Call DWARF subroutine from DW_AT_location of DIE at DIE_OFFSET in
- current CU (as is PER_CU). State of the CTX is not affected by the
- call and return. */
-
static void
per_cu_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset,
- struct dwarf2_per_cu_data *per_cu,
- CORE_ADDR (*get_frame_pc) (void *baton),
- void *baton)
+ struct dwarf2_per_cu_data *per_cu)
{
struct dwarf2_locexpr_baton block;
- block = dwarf2_fetch_die_location_block (die_offset, per_cu,
- get_frame_pc, baton);
+ block = dwarf2_fetch_die_loc_cu_off (die_offset, per_cu,
+ get_frame_pc_for_per_cu_dwarf_call,
+ ctx);
/* DW_OP_call_ref is currently not supported. */
gdb_assert (block.per_cu == per_cu);
- dwarf_expr_eval (ctx, block.data, block.size);
+ ctx->eval (block.data, block.size);
}
-/* Helper interface of per_cu_dwarf_call for dwarf2_evaluate_loc_desc. */
+/* 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 void
-dwarf_expr_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset)
+static struct value *
+sect_variable_value (struct dwarf_expr_context *ctx, sect_offset sect_off,
+ struct dwarf2_per_cu_data *per_cu)
{
- struct dwarf_expr_baton *debaton = ctx->baton;
+ struct type *die_type = dwarf2_fetch_die_type_sect_off (sect_off, per_cu);
- per_cu_dwarf_call (ctx, die_offset, debaton->per_cu,
- ctx->funcs->get_frame_pc, ctx->baton);
-}
+ if (die_type == NULL)
+ error (_("Bad DW_OP_GNU_variable_value DIE."));
-/* Callback function for dwarf2_evaluate_loc_desc. */
+ /* 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."));
-static struct type *
-dwarf_expr_get_base_type (struct dwarf_expr_context *ctx,
- cu_offset die_offset)
+ 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
{
- struct dwarf_expr_baton *debaton = ctx->baton;
+ public:
- return dwarf2_get_die_type (die_offset, debaton->per_cu);
-}
+ struct frame_info *frame;
+ struct dwarf2_per_cu_data *per_cu;
+ CORE_ADDR obj_address;
+
+ /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for
+ the frame in BATON. */
+
+ 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
+ {
+ 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
+ {
+ struct objfile *objfile = dwarf2_per_cu_objfile (per_cu);
+
+ return target_translate_tls_address (objfile, offset);
+ }
+
+ /* Helper interface of per_cu_dwarf_call for
+ dwarf2_evaluate_loc_desc. */
+
+ 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_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)
+ error (_("Could not find type for DW_OP_const_type"));
+ if (size != 0 && TYPE_LENGTH (result) != size)
+ error (_("DW_OP_const_type has different sizes for type and data"));
+ return result;
+ }
+
+ /* Callback function for dwarf2_evaluate_loc_desc.
+ Fetch the address indexed by DW_OP_addrx or DW_OP_GNU_addr_index. */
+
+ 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
+ {
+ if (obj_address == 0)
+ error (_("Location address is not set."));
+ return obj_address;
+ }
+
+ /* Execute DWARF block of call_site_parameter which matches KIND and
+ KIND_U. Choose DEREF_SIZE value of that parameter. Search
+ caller of this objects's frame.
+
+ The caller can be from a different CU - per_cu_dwarf_call
+ implementation can be more simple as it does not support cross-CU
+ DWARF executions. */
+
+ void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u,
+ int deref_size) override
+ {
+ struct frame_info *caller_frame;
+ struct dwarf2_per_cu_data *caller_per_cu;
+ struct call_site_parameter *parameter;
+ const gdb_byte *data_src;
+ size_t size;
+
+ caller_frame = get_prev_frame (frame);
+
+ parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u,
+ &caller_per_cu);
+ data_src = deref_size == -1 ? parameter->value : parameter->data_value;
+ size = deref_size == -1 ? parameter->value_size : parameter->data_value_size;
+
+ /* DEREF_SIZE size is not verified here. */
+ if (data_src == NULL)
+ throw_error (NO_ENTRY_VALUE_ERROR,
+ _("Cannot resolve DW_AT_call_data_value"));
+
+ scoped_restore save_frame = make_scoped_restore (&this->frame,
+ caller_frame);
+ scoped_restore save_per_cu = make_scoped_restore (&this->per_cu,
+ caller_per_cu);
+ scoped_restore save_obj_addr = make_scoped_restore (&this->obj_address,
+ (CORE_ADDR) 0);
+
+ scoped_restore save_arch = make_scoped_restore (&this->gdbarch);
+ this->gdbarch
+ = get_objfile_arch (dwarf2_per_cu_objfile (per_cu));
+ scoped_restore save_addr_size = make_scoped_restore (&this->addr_size);
+ this->addr_size = dwarf2_per_cu_addr_size (per_cu);
+ scoped_restore save_offset = make_scoped_restore (&this->offset);
+ this->offset = dwarf2_per_cu_text_offset (per_cu);
+
+ this->eval (data_src, size);
+ }
+
+ /* 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
+ {
+ /* FIXME: cagney/2003-03-26: This code should be using
+ get_frame_base_address(), and then implement a dwarf2 specific
+ this_base method. */
+ struct symbol *framefunc;
+ const struct block *bl = get_frame_block (frame, NULL);
+
+ if (bl == NULL)
+ error (_("frame address is not available."));
+
+ /* Use block_linkage_function, which returns a real (not inlined)
+ function, instead of get_frame_function, which may return an
+ inlined function. */
+ framefunc = block_linkage_function (bl);
+
+ /* If we found a frame-relative symbol then it was certainly within
+ some function associated with a frame. If we can't find the frame,
+ something has gone wrong. */
+ gdb_assert (framefunc != NULL);
+
+ func_get_frame_base_dwarf_block (framefunc,
+ get_frame_address_in_block (frame),
+ start, length);
+ }
+
+ /* Read memory at ADDR (length LEN) into BUF. */
+
+ 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
+ {
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum);
+
+ return address_from_register (regnum, frame);
+ }
+
+ /* Implement "get_reg_value" callback. */
+
+ 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);
+
+ return value_from_register (type, regnum, frame);
+ }
+};
/* See dwarf2loc.h. */
-int entry_values_debug = 0;
+unsigned int entry_values_debug = 0;
/* Helper to set entry_values_debug. */
value);
}
-/* Find DW_TAG_GNU_call_site's DW_AT_GNU_call_site_target address.
+/* Find DW_TAG_call_site's DW_AT_call_target address.
CALLER_FRAME (for registers) can be NULL if it is not known. This function
always returns valid address or it throws NO_ENTRY_VALUE_ERROR. */
dwarf_block = FIELD_DWARF_BLOCK (call_site->target);
if (dwarf_block == NULL)
{
- struct minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol_by_pc (call_site->pc - 1);
throw_error (NO_ENTRY_VALUE_ERROR,
- _("DW_AT_GNU_call_site_target is not specified "
- "at %s in %s"),
+ _("DW_AT_call_target is not specified at %s in %s"),
paddress (call_site_gdbarch, call_site->pc),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym));
+ (msym.minsym == NULL ? "???"
+ : msym.minsym->print_name ()));
}
if (caller_frame == NULL)
{
- struct minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol_by_pc (call_site->pc - 1);
throw_error (NO_ENTRY_VALUE_ERROR,
- _("DW_AT_GNU_call_site_target DWARF block resolving "
+ _("DW_AT_call_target DWARF block resolving "
"requires known frame which is currently not "
"available at %s in %s"),
paddress (call_site_gdbarch, call_site->pc),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym));
+ (msym.minsym == NULL ? "???"
+ : msym.minsym->print_name ()));
}
caller_arch = get_frame_arch (caller_frame);
val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame,
dwarf_block->data, dwarf_block->size,
dwarf_block->per_cu);
- /* DW_AT_GNU_call_site_target is a DWARF expression, not a DWARF
- location. */
+ /* DW_AT_call_target is a DWARF expression, not a DWARF location. */
if (VALUE_LVAL (val) == lval_memory)
return value_address (val);
else
case FIELD_LOC_KIND_PHYSNAME:
{
const char *physname;
- struct minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
physname = FIELD_STATIC_PHYSNAME (call_site->target);
- msym = lookup_minimal_symbol_text (physname, NULL);
- if (msym == NULL)
+
+ /* Handle both the mangled and demangled PHYSNAME. */
+ msym = lookup_minimal_symbol (physname, NULL, NULL);
+ if (msym.minsym == NULL)
{
msym = lookup_minimal_symbol_by_pc (call_site->pc - 1);
throw_error (NO_ENTRY_VALUE_ERROR,
_("Cannot find function \"%s\" for a call site target "
"at %s in %s"),
physname, paddress (call_site_gdbarch, call_site->pc),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym));
+ (msym.minsym == NULL ? "???"
+ : msym.minsym->print_name ()));
}
- return SYMBOL_VALUE_ADDRESS (msym);
+ return BMSYMBOL_VALUE_ADDRESS (msym);
}
case FIELD_LOC_KIND_PHYSADDR:
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_GNU_call_site resolving failed to find function "
+ _("DW_TAG_call_site resolving failed to find function "
"name for address %s"),
paddress (gdbarch, addr));
static void
func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr)
{
- struct obstack addr_obstack;
- struct cleanup *old_chain;
CORE_ADDR addr;
- /* Track here CORE_ADDRs which were already visited. */
- htab_t addr_hash;
-
/* The verification is completely unordered. Track here function addresses
which still need to be iterated. */
- VEC (CORE_ADDR) *todo = NULL;
+ std::vector<CORE_ADDR> todo;
- obstack_init (&addr_obstack);
- old_chain = make_cleanup_obstack_free (&addr_obstack);
- addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL,
- &addr_obstack, hashtab_obstack_allocate,
- NULL);
- make_cleanup_htab_delete (addr_hash);
-
- make_cleanup (VEC_cleanup (CORE_ADDR), &todo);
+ /* Track here CORE_ADDRs which were already visited. */
+ std::unordered_set<CORE_ADDR> addr_hash;
- VEC_safe_push (CORE_ADDR, todo, verify_addr);
- while (!VEC_empty (CORE_ADDR, todo))
+ todo.push_back (verify_addr);
+ while (!todo.empty ())
{
struct symbol *func_sym;
struct call_site *call_site;
- addr = VEC_pop (CORE_ADDR, todo);
+ addr = todo.back ();
+ todo.pop_back ();
func_sym = func_addr_to_tail_call_list (gdbarch, addr);
call_site; call_site = call_site->tail_call_next)
{
CORE_ADDR target_addr;
- void **slot;
/* CALLER_FRAME with registers is not available for tail-call jumped
frames. */
if (target_addr == verify_addr)
{
- struct minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol_by_pc (verify_addr);
throw_error (NO_ENTRY_VALUE_ERROR,
- _("DW_OP_GNU_entry_value resolving has found "
+ _("DW_OP_entry_value resolving has found "
"function \"%s\" at %s can call itself via tail "
"calls"),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym),
+ (msym.minsym == NULL ? "???"
+ : msym.minsym->print_name ()),
paddress (gdbarch, verify_addr));
}
- slot = htab_find_slot (addr_hash, &target_addr, INSERT);
- if (*slot == NULL)
- {
- *slot = obstack_copy (&addr_obstack, &target_addr,
- sizeof (target_addr));
- VEC_safe_push (CORE_ADDR, todo, target_addr);
- }
+ if (addr_hash.insert (target_addr).second)
+ todo.push_back (target_addr);
}
}
-
- do_cleanups (old_chain);
}
/* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for
tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site)
{
CORE_ADDR addr = call_site->pc;
- struct minimal_symbol *msym = lookup_minimal_symbol_by_pc (addr - 1);
+ struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1);
fprintf_unfiltered (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym));
+ (msym.minsym == NULL ? "???"
+ : msym.minsym->print_name ()));
}
-/* vec.h needs single word type name, typedef it. */
-typedef struct call_site *call_sitep;
-
-/* Define VEC (call_sitep) functions. */
-DEF_VEC_P (call_sitep);
-
/* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP
only top callers and bottom callees which are present in both. GDBARCH is
used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are
responsible for xfree of any RESULTP data. */
static void
-chain_candidate (struct gdbarch *gdbarch, struct call_site_chain **resultp,
- VEC (call_sitep) *chain)
+chain_candidate (struct gdbarch *gdbarch,
+ gdb::unique_xmalloc_ptr<struct call_site_chain> *resultp,
+ std::vector<struct call_site *> *chain)
{
- struct call_site_chain *result = *resultp;
- long length = VEC_length (call_sitep, chain);
+ long length = chain->size ();
int callers, callees, idx;
- if (result == NULL)
+ if (*resultp == NULL)
{
/* Create the initial chain containing all the passed PCs. */
- result = xmalloc (sizeof (*result) + sizeof (*result->call_site)
- * (length - 1));
+ struct call_site_chain *result
+ = ((struct call_site_chain *)
+ xmalloc (sizeof (*result)
+ + sizeof (*result->call_site) * (length - 1)));
result->length = length;
result->callers = result->callees = length;
- memcpy (result->call_site, VEC_address (call_sitep, chain),
- sizeof (*result->call_site) * length);
- *resultp = result;
+ if (!chain->empty ())
+ memcpy (result->call_site, chain->data (),
+ sizeof (*result->call_site) * length);
+ resultp->reset (result);
if (entry_values_debug)
{
{
fprintf_unfiltered (gdb_stdlog, "tailcall: compare:");
for (idx = 0; idx < length; idx++)
- tailcall_dump (gdbarch, VEC_index (call_sitep, chain, idx));
+ tailcall_dump (gdbarch, chain->at (idx));
fputc_unfiltered ('\n', gdb_stdlog);
}
/* Intersect callers. */
- callers = min (result->callers, length);
+ callers = std::min ((long) (*resultp)->callers, length);
for (idx = 0; idx < callers; idx++)
- if (result->call_site[idx] != VEC_index (call_sitep, chain, idx))
+ if ((*resultp)->call_site[idx] != chain->at (idx))
{
- result->callers = idx;
+ (*resultp)->callers = idx;
break;
}
/* Intersect callees. */
- callees = min (result->callees, length);
+ callees = std::min ((long) (*resultp)->callees, length);
for (idx = 0; idx < callees; idx++)
- if (result->call_site[result->length - 1 - idx]
- != VEC_index (call_sitep, chain, length - 1 - idx))
+ if ((*resultp)->call_site[(*resultp)->length - 1 - idx]
+ != chain->at (length - 1 - idx))
{
- result->callees = idx;
+ (*resultp)->callees = idx;
break;
}
if (entry_values_debug)
{
fprintf_unfiltered (gdb_stdlog, "tailcall: reduced:");
- for (idx = 0; idx < result->callers; idx++)
- tailcall_dump (gdbarch, result->call_site[idx]);
+ for (idx = 0; idx < (*resultp)->callers; idx++)
+ tailcall_dump (gdbarch, (*resultp)->call_site[idx]);
fputs_unfiltered (" |", gdb_stdlog);
- for (idx = 0; idx < result->callees; idx++)
- tailcall_dump (gdbarch, result->call_site[result->length
- - result->callees + idx]);
+ for (idx = 0; idx < (*resultp)->callees; idx++)
+ tailcall_dump (gdbarch,
+ (*resultp)->call_site[(*resultp)->length
+ - (*resultp)->callees + idx]);
fputc_unfiltered ('\n', gdb_stdlog);
}
- if (result->callers == 0 && result->callees == 0)
+ if ((*resultp)->callers == 0 && (*resultp)->callees == 0)
{
/* There are no common callers or callees. It could be also a direct
call (which has length 0) with ambiguous possibility of an indirect
call - CALLERS == CALLEES == 0 is valid during the first allocation
but any subsequence processing of such entry means ambiguity. */
- xfree (result);
- *resultp = NULL;
+ resultp->reset (NULL);
return;
}
/* See call_site_find_chain_1 why there is no way to reach the bottom callee
PC again. In such case there must be two different code paths to reach
- it, therefore some of the former determined intermediate PCs must differ
- and the unambiguous chain gets shortened. */
- gdb_assert (result->callers + result->callees < result->length);
+ it. CALLERS + CALLEES equal to LENGTH in the case of self tail-call. */
+ gdb_assert ((*resultp)->callers + (*resultp)->callees <= (*resultp)->length);
}
/* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the
call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc,
CORE_ADDR callee_pc)
{
- struct obstack addr_obstack;
- struct cleanup *back_to_retval, *back_to_workdata;
- struct call_site_chain *retval = NULL;
+ CORE_ADDR save_callee_pc = callee_pc;
+ gdb::unique_xmalloc_ptr<struct call_site_chain> retval;
struct call_site *call_site;
- /* Mark CALL_SITEs so we do not visit the same ones twice. */
- htab_t addr_hash;
-
/* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's
call_site nor any possible call_site at CALLEE_PC's function is there.
Any CALL_SITE in CHAIN will be iterated to its siblings - via
TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */
- VEC (call_sitep) *chain = NULL;
+ std::vector<struct call_site *> chain;
/* We are not interested in the specific PC inside the callee function. */
callee_pc = get_pc_function_start (callee_pc);
if (callee_pc == 0)
throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"),
- paddress (gdbarch, callee_pc));
+ paddress (gdbarch, save_callee_pc));
- back_to_retval = make_cleanup (free_current_contents, &retval);
-
- obstack_init (&addr_obstack);
- back_to_workdata = make_cleanup_obstack_free (&addr_obstack);
- addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL,
- &addr_obstack, hashtab_obstack_allocate,
- NULL);
- make_cleanup_htab_delete (addr_hash);
-
- make_cleanup (VEC_cleanup (call_sitep), &chain);
+ /* Mark CALL_SITEs so we do not visit the same ones twice. */
+ std::unordered_set<CORE_ADDR> addr_hash;
/* Do not push CALL_SITE to CHAIN. Push there only the first tail call site
at the target's function. All the possible tail call sites in the
if (target_func_addr == callee_pc)
{
- chain_candidate (gdbarch, &retval, chain);
+ chain_candidate (gdbarch, &retval, &chain);
if (retval == NULL)
break;
if (target_call_site)
{
- void **slot;
-
- slot = htab_find_slot (addr_hash, &target_call_site->pc, INSERT);
- if (*slot == NULL)
+ if (addr_hash.insert (target_call_site->pc).second)
{
/* Successfully entered TARGET_CALL_SITE. */
- *slot = &target_call_site->pc;
- VEC_safe_push (call_sitep, chain, target_call_site);
+ chain.push_back (target_call_site);
break;
}
}
sibling etc. */
target_call_site = NULL;
- while (!VEC_empty (call_sitep, chain))
+ while (!chain.empty ())
{
- call_site = VEC_pop (call_sitep, chain);
+ call_site = chain.back ();
+ chain.pop_back ();
- gdb_assert (htab_find_slot (addr_hash, &call_site->pc,
- NO_INSERT) != NULL);
- htab_remove_elt (addr_hash, &call_site->pc);
+ size_t removed = addr_hash.erase (call_site->pc);
+ gdb_assert (removed == 1);
target_call_site = call_site->tail_call_next;
if (target_call_site)
}
while (target_call_site);
- if (VEC_empty (call_sitep, chain))
+ if (chain.empty ())
call_site = NULL;
else
- call_site = VEC_last (call_sitep, chain);
+ call_site = chain.back ();
}
if (retval == NULL)
{
- struct minimal_symbol *msym_caller, *msym_callee;
+ struct bound_minimal_symbol msym_caller, msym_callee;
msym_caller = lookup_minimal_symbol_by_pc (caller_pc);
msym_callee = lookup_minimal_symbol_by_pc (callee_pc);
_("There are no unambiguously determinable intermediate "
"callers or callees between caller function \"%s\" at %s "
"and callee function \"%s\" at %s"),
- (msym_caller == NULL
- ? "???" : SYMBOL_PRINT_NAME (msym_caller)),
+ (msym_caller.minsym == NULL
+ ? "???" : msym_caller.minsym->print_name ()),
paddress (gdbarch, caller_pc),
- (msym_callee == NULL
- ? "???" : SYMBOL_PRINT_NAME (msym_callee)),
+ (msym_callee.minsym == NULL
+ ? "???" : msym_callee.minsym->print_name ()),
paddress (gdbarch, callee_pc));
}
- do_cleanups (back_to_workdata);
- discard_cleanups (back_to_retval);
- return retval;
+ return retval.release ();
}
/* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the
call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc,
CORE_ADDR callee_pc)
{
- volatile struct gdb_exception e;
struct call_site_chain *retval = NULL;
- TRY_CATCH (e, RETURN_MASK_ERROR)
+ try
{
retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc);
}
- if (e.reason < 0)
+ catch (const gdb_exception_error &e)
{
if (e.error == NO_ENTRY_VALUE_ERROR)
{
return NULL;
}
else
- throw_exception (e);
+ throw;
}
+
return retval;
}
-/* Fetch call_site_parameter from caller matching the parameters. FRAME is for
- callee. See DWARF_REG and FB_OFFSET description at struct
- dwarf_expr_context_funcs->push_dwarf_reg_entry_value.
+/* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */
+
+static int
+call_site_parameter_matches (struct call_site_parameter *parameter,
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u)
+{
+ if (kind == parameter->kind)
+ switch (kind)
+ {
+ case CALL_SITE_PARAMETER_DWARF_REG:
+ return kind_u.dwarf_reg == parameter->u.dwarf_reg;
+ case CALL_SITE_PARAMETER_FB_OFFSET:
+ return kind_u.fb_offset == parameter->u.fb_offset;
+ case CALL_SITE_PARAMETER_PARAM_OFFSET:
+ return kind_u.param_cu_off == parameter->u.param_cu_off;
+ }
+ return 0;
+}
+
+/* Fetch call_site_parameter from caller matching KIND and KIND_U.
+ FRAME is for callee.
Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR
otherwise. */
static struct call_site_parameter *
-dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, int dwarf_reg,
- CORE_ADDR fb_offset,
+dwarf_expr_reg_to_entry_parameter (struct frame_info *frame,
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u,
struct dwarf2_per_cu_data **per_cu_return)
{
- CORE_ADDR func_addr = get_frame_func (frame);
- CORE_ADDR caller_pc;
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct frame_info *caller_frame = get_prev_frame (frame);
+ CORE_ADDR func_addr, caller_pc;
+ struct gdbarch *gdbarch;
+ struct frame_info *caller_frame;
struct call_site *call_site;
int iparams;
/* Initialize it just to avoid a GCC false warning. */
struct call_site_parameter *parameter = NULL;
CORE_ADDR target_addr;
+ while (get_frame_type (frame) == INLINE_FRAME)
+ {
+ frame = get_prev_frame (frame);
+ gdb_assert (frame != NULL);
+ }
+
+ func_addr = get_frame_func (frame);
+ gdbarch = get_frame_arch (frame);
+ caller_frame = get_prev_frame (frame);
if (gdbarch != frame_unwind_arch (frame))
{
- struct minimal_symbol *msym = lookup_minimal_symbol_by_pc (func_addr);
+ struct bound_minimal_symbol msym
+ = lookup_minimal_symbol_by_pc (func_addr);
struct gdbarch *caller_gdbarch = frame_unwind_arch (frame);
throw_error (NO_ENTRY_VALUE_ERROR,
- _("DW_OP_GNU_entry_value resolving callee gdbarch %s "
+ _("DW_OP_entry_value resolving callee gdbarch %s "
"(of %s (%s)) does not match caller gdbarch %s"),
gdbarch_bfd_arch_info (gdbarch)->printable_name,
paddress (gdbarch, func_addr),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym),
+ (msym.minsym == NULL ? "???"
+ : msym.minsym->print_name ()),
gdbarch_bfd_arch_info (caller_gdbarch)->printable_name);
}
if (caller_frame == NULL)
{
- struct minimal_symbol *msym = lookup_minimal_symbol_by_pc (func_addr);
+ struct bound_minimal_symbol msym
+ = lookup_minimal_symbol_by_pc (func_addr);
- throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_GNU_entry_value resolving "
+ throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_entry_value resolving "
"requires caller of %s (%s)"),
paddress (gdbarch, func_addr),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym));
+ (msym.minsym == NULL ? "???"
+ : msym.minsym->print_name ()));
}
caller_pc = get_frame_pc (caller_frame);
call_site = call_site_for_pc (gdbarch, caller_pc);
{
struct minimal_symbol *target_msym, *func_msym;
- target_msym = lookup_minimal_symbol_by_pc (target_addr);
- func_msym = lookup_minimal_symbol_by_pc (func_addr);
+ target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym;
+ func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym;
throw_error (NO_ENTRY_VALUE_ERROR,
- _("DW_OP_GNU_entry_value resolving expects callee %s at %s "
+ _("DW_OP_entry_value resolving expects callee %s at %s "
"but the called frame is for %s at %s"),
(target_msym == NULL ? "???"
- : SYMBOL_PRINT_NAME (target_msym)),
+ : target_msym->print_name ()),
paddress (gdbarch, target_addr),
- func_msym == NULL ? "???" : SYMBOL_PRINT_NAME (func_msym),
+ func_msym == NULL ? "???" : func_msym->print_name (),
paddress (gdbarch, func_addr));
}
for (iparams = 0; iparams < call_site->parameter_count; iparams++)
{
parameter = &call_site->parameter[iparams];
- if (parameter->dwarf_reg == -1 && dwarf_reg == -1)
- {
- if (parameter->fb_offset == fb_offset)
- break;
- }
- else if (parameter->dwarf_reg == dwarf_reg)
+ if (call_site_parameter_matches (parameter, kind, kind_u))
break;
}
if (iparams == call_site->parameter_count)
{
- struct minimal_symbol *msym = lookup_minimal_symbol_by_pc (caller_pc);
+ struct minimal_symbol *msym
+ = lookup_minimal_symbol_by_pc (caller_pc).minsym;
- /* DW_TAG_GNU_call_site_parameter will be missing just if GCC could not
+ /* DW_TAG_call_site_parameter will be missing just if GCC could not
determine its value. */
throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter "
- "at DW_TAG_GNU_call_site %s at %s"),
+ "at DW_TAG_call_site %s at %s"),
paddress (gdbarch, caller_pc),
- msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym));
+ msym == NULL ? "???" : msym->print_name ());
}
*per_cu_return = call_site->per_cu;
}
/* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return
- the normal DW_AT_GNU_call_site_value block. Otherwise return the
- DW_AT_GNU_call_site_data_value (dereferenced) block.
+ the normal DW_AT_call_value block. Otherwise return the
+ DW_AT_call_data_value (dereferenced) block.
TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned
struct value.
/* DEREF_SIZE size is not verified here. */
if (data_src == NULL)
throw_error (NO_ENTRY_VALUE_ERROR,
- _("Cannot resolve DW_AT_GNU_call_site_data_value"));
+ _("Cannot resolve DW_AT_call_data_value"));
- /* DW_AT_GNU_call_site_value is a DWARF expression, not a DWARF
+ /* DW_AT_call_value is a DWARF expression, not a DWARF
location. Postprocessing of DWARF_VALUE_MEMORY would lose the type from
DWARF block. */
- data = alloca (size + 1);
+ data = (gdb_byte *) alloca (size + 1);
memcpy (data, data_src, size);
data[size] = DW_OP_stack_value;
return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu);
}
-/* Execute call_site_parameter's DWARF block matching DEREF_SIZE for caller of
- the CTX's frame. CTX must be of dwarf_expr_ctx_funcs kind. See DWARF_REG
- and FB_OFFSET description at struct
- dwarf_expr_context_funcs->push_dwarf_reg_entry_value.
-
- The CTX caller can be from a different CU - per_cu_dwarf_call implementation
- can be more simple as it does not support cross-CU DWARF executions. */
-
-static void
-dwarf_expr_push_dwarf_reg_entry_value (struct dwarf_expr_context *ctx,
- int dwarf_reg, CORE_ADDR fb_offset,
- int deref_size)
-{
- struct dwarf_expr_baton *debaton;
- struct frame_info *frame, *caller_frame;
- struct dwarf2_per_cu_data *caller_per_cu;
- struct dwarf_expr_baton baton_local;
- struct dwarf_expr_context saved_ctx;
- struct call_site_parameter *parameter;
- const gdb_byte *data_src;
- size_t size;
-
- gdb_assert (ctx->funcs == &dwarf_expr_ctx_funcs);
- debaton = ctx->baton;
- frame = debaton->frame;
- caller_frame = get_prev_frame (frame);
-
- parameter = dwarf_expr_reg_to_entry_parameter (frame, dwarf_reg, fb_offset,
- &caller_per_cu);
- data_src = deref_size == -1 ? parameter->value : parameter->data_value;
- size = deref_size == -1 ? parameter->value_size : parameter->data_value_size;
-
- /* DEREF_SIZE size is not verified here. */
- if (data_src == NULL)
- throw_error (NO_ENTRY_VALUE_ERROR,
- _("Cannot resolve DW_AT_GNU_call_site_data_value"));
-
- baton_local.frame = caller_frame;
- baton_local.per_cu = caller_per_cu;
-
- saved_ctx.gdbarch = ctx->gdbarch;
- saved_ctx.addr_size = ctx->addr_size;
- saved_ctx.offset = ctx->offset;
- saved_ctx.baton = ctx->baton;
- ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (baton_local.per_cu));
- ctx->addr_size = dwarf2_per_cu_addr_size (baton_local.per_cu);
- ctx->offset = dwarf2_per_cu_text_offset (baton_local.per_cu);
- ctx->baton = &baton_local;
-
- dwarf_expr_eval (ctx, data_src, size);
-
- ctx->gdbarch = saved_ctx.gdbarch;
- ctx->addr_size = saved_ctx.addr_size;
- ctx->offset = saved_ctx.offset;
- ctx->baton = saved_ctx.baton;
-}
-
-/* Callback function for dwarf2_evaluate_loc_desc.
- Fetch the address indexed by DW_OP_GNU_addr_index. */
-
-static CORE_ADDR
-dwarf_expr_get_addr_index (void *baton, unsigned int index)
-{
- struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
-
- return dwarf2_read_addr_index (debaton->per_cu, index);
-}
-
/* VALUE must be of type lval_computed with entry_data_value_funcs. Perform
the indirect method on it, that is use its stored target value, the sole
purpose of entry_data_value_funcs.. */
struct type *checked_type = check_typedef (value_type (value));
struct value *target_val;
- if (TYPE_CODE (checked_type) != TYPE_CODE_REF)
+ if (!TYPE_IS_REFERENCE (checked_type))
return NULL;
- target_val = value_computed_closure (value);
+ target_val = (struct value *) value_computed_closure (value);
value_incref (target_val);
return target_val;
}
static void *
entry_data_value_copy_closure (const struct value *v)
{
- struct value *target_val = value_computed_closure (v);
+ struct value *target_val = (struct value *) value_computed_closure (v);
value_incref (target_val);
return target_val;
static void
entry_data_value_free_closure (struct value *v)
{
- struct value *target_val = value_computed_closure (v);
+ 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
is stored in the caller. On the first dereference use
- DW_AT_GNU_call_site_data_value in the caller. */
+ DW_AT_call_data_value in the caller. */
static const struct lval_funcs entry_data_value_funcs =
{
NULL, /* read */
NULL, /* write */
- NULL, /* check_validity */
- NULL, /* check_any_valid */
NULL, /* indirect */
entry_data_value_coerce_ref,
NULL, /* check_synthetic_pointer */
entry_data_value_free_closure
};
-/* Read parameter of TYPE at (callee) FRAME's function entry. DWARF_REG and
- FB_OFFSET are used to match DW_AT_location at the caller's
- DW_TAG_GNU_call_site_parameter. See DWARF_REG and FB_OFFSET description at
- struct dwarf_expr_context_funcs->push_dwarf_reg_entry_value.
+/* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U
+ are used to match DW_AT_location at the caller's
+ DW_TAG_call_site_parameter.
Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it
cannot resolve the parameter for any reason. */
static struct value *
value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame,
- int dwarf_reg, CORE_ADDR fb_offset)
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u)
{
struct type *checked_type = check_typedef (type);
struct type *target_type = TYPE_TARGET_TYPE (checked_type);
struct value *outer_val, *target_val, *val;
struct call_site_parameter *parameter;
struct dwarf2_per_cu_data *caller_per_cu;
- CORE_ADDR addr;
- parameter = dwarf_expr_reg_to_entry_parameter (frame, dwarf_reg, fb_offset,
+ parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u,
&caller_per_cu);
outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */,
type, caller_frame,
caller_per_cu);
- /* Check if DW_AT_GNU_call_site_data_value cannot be used. If it should be
+ /* Check if DW_AT_call_data_value cannot be used. If it should be
used and it is not available do not fall back to OUTER_VAL - dereferencing
TYPE_CODE_REF with non-entry data value would give current value - not the
entry value. */
- if (TYPE_CODE (checked_type) != TYPE_CODE_REF
+ if (!TYPE_IS_REFERENCE (checked_type)
|| TYPE_TARGET_TYPE (checked_type) == NULL)
return outer_val;
target_type, caller_frame,
caller_per_cu);
- /* value_as_address dereferences TYPE_CODE_REF. */
- addr = extract_typed_address (value_contents (outer_val), checked_type);
-
- /* The target entry value has artificial address of the entry value
- reference. */
- VALUE_LVAL (target_val) = lval_memory;
- set_value_address (target_val, addr);
-
- release_value (target_val);
val = allocate_computed_value (type, &entry_data_value_funcs,
- target_val /* closure */);
+ release_value (target_val).release ());
/* Copy the referencing pointer to the new computed value. */
memcpy (value_contents_raw (val), value_contents_raw (outer_val),
/* Read parameter of TYPE at (callee) FRAME's function entry. DATA and
SIZE are DWARF block used to match DW_AT_location at the caller's
- DW_TAG_GNU_call_site_parameter.
+ DW_TAG_call_site_parameter.
Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it
cannot resolve the parameter for any reason. */
value_of_dwarf_block_entry (struct type *type, struct frame_info *frame,
const gdb_byte *block, size_t block_len)
{
- int dwarf_reg;
- CORE_ADDR fb_offset;
+ union call_site_parameter_u kind_u;
- dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len);
- if (dwarf_reg != -1)
- return value_of_dwarf_reg_entry (type, frame, dwarf_reg, 0 /* unused */);
+ kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len);
+ if (kind_u.dwarf_reg != -1)
+ return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG,
+ kind_u);
- if (dwarf_block_to_fb_offset (block, block + block_len, &fb_offset))
- return value_of_dwarf_reg_entry (type, frame, -1, fb_offset);
+ if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset))
+ return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET,
+ kind_u);
/* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message
suppressed during normal operation. The expression can be arbitrary if
there is no caller-callee entry value binding expected. */
throw_error (NO_ENTRY_VALUE_ERROR,
- _("DWARF-2 expression error: DW_OP_GNU_entry_value is supported "
+ _("DWARF-2 expression error: DW_OP_entry_value is supported "
"only for single DW_OP_reg* or for DW_OP_fbreg(*)"));
}
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;
-
- /* The number of pieces used to describe this variable. */
- int n_pieces;
+ struct dwarf2_per_cu_data *per_cu = NULL;
- /* The target address size, used only for DWARF_VALUE_STACK. */
- int addr_size;
+ /* The pieces describing this variable. */
+ std::vector<dwarf_expr_piece> pieces;
- /* The pieces themselves. */
- struct dwarf_expr_piece *pieces;
+ /* Frame ID of frame to which a register value is relative, used
+ only by DWARF_VALUE_REGISTER. */
+ struct frame_id frame_id;
};
/* Allocate a closure for a value formed from separately-described
static struct piece_closure *
allocate_piece_closure (struct dwarf2_per_cu_data *per_cu,
- int n_pieces, struct dwarf_expr_piece *pieces,
- int addr_size)
+ std::vector<dwarf_expr_piece> &&pieces,
+ struct frame_info *frame)
{
- struct piece_closure *c = XZALLOC (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->addr_size = addr_size;
- c->pieces = XCALLOC (n_pieces, struct dwarf_expr_piece);
+ 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;
}
-/* The lowest-level function to extract bits from a byte buffer.
- SOURCE is the buffer. It is updated if we read to the end of a
- byte.
- SOURCE_OFFSET_BITS is the offset of the first bit to read. It is
- updated to reflect the number of bits actually read.
- NBITS is the number of bits we want to read. It is updated to
- reflect the number of bits actually read. This function may read
- fewer bits.
- BITS_BIG_ENDIAN is taken directly from gdbarch.
- This function returns the extracted bits. */
+/* Return the number of bytes overlapping a contiguous chunk of N_BITS
+ bits whose first bit is located at bit offset START. */
-static unsigned int
-extract_bits_primitive (const gdb_byte **source,
- unsigned int *source_offset_bits,
- int *nbits, int bits_big_endian)
+static size_t
+bits_to_bytes (ULONGEST start, ULONGEST n_bits)
{
- unsigned int avail, mask, datum;
-
- gdb_assert (*source_offset_bits < 8);
-
- avail = 8 - *source_offset_bits;
- if (avail > *nbits)
- avail = *nbits;
-
- mask = (1 << avail) - 1;
- datum = **source;
- if (bits_big_endian)
- datum >>= 8 - (*source_offset_bits + *nbits);
- else
- datum >>= *source_offset_bits;
- datum &= mask;
-
- *nbits -= avail;
- *source_offset_bits += avail;
- if (*source_offset_bits >= 8)
- {
- *source_offset_bits -= 8;
- ++*source;
- }
-
- return datum;
+ return (start % 8 + n_bits + 7) / 8;
}
-/* Extract some bits from a source buffer and move forward in the
- buffer.
-
- SOURCE is the source buffer. It is updated as bytes are read.
- SOURCE_OFFSET_BITS is the offset into SOURCE. It is updated as
- bits are read.
- NBITS is the number of bits to read.
- BITS_BIG_ENDIAN is taken directly from gdbarch.
-
- This function returns the bits that were read. */
-
-static unsigned int
-extract_bits (const gdb_byte **source, unsigned int *source_offset_bits,
- int nbits, int bits_big_endian)
-{
- unsigned int datum;
-
- gdb_assert (nbits > 0 && nbits <= 8);
-
- datum = extract_bits_primitive (source, source_offset_bits, &nbits,
- bits_big_endian);
- if (nbits > 0)
- {
- unsigned int more;
-
- more = extract_bits_primitive (source, source_offset_bits, &nbits,
- bits_big_endian);
- if (bits_big_endian)
- datum <<= nbits;
- else
- more <<= nbits;
- datum |= more;
- }
-
- return datum;
-}
-
-/* Write some bits into a buffer and move forward in the buffer.
-
- DATUM is the bits to write. The low-order bits of DATUM are used.
- DEST is the destination buffer. It is updated as bytes are
- written.
- DEST_OFFSET_BITS is the bit offset in DEST at which writing is
- done.
- NBITS is the number of valid bits in DATUM.
- BITS_BIG_ENDIAN is taken directly from gdbarch. */
+/* Read or write a pieced value V. If FROM != NULL, operate in "write
+ mode": copy FROM into the pieces comprising V. If FROM == NULL,
+ operate in "read mode": fetch the contents of the (lazy) value V by
+ composing it from its pieces. */
static void
-insert_bits (unsigned int datum,
- gdb_byte *dest, unsigned int dest_offset_bits,
- int nbits, int bits_big_endian)
+rw_pieced_value (struct value *v, struct value *from)
{
- unsigned int mask;
-
- gdb_assert (dest_offset_bits + nbits <= 8);
+ int i;
+ LONGEST offset = 0, max_offset;
+ ULONGEST bits_to_skip;
+ gdb_byte *v_contents;
+ const gdb_byte *from_contents;
+ struct piece_closure *c
+ = (struct piece_closure *) value_computed_closure (v);
+ gdb::byte_vector buffer;
+ bool bits_big_endian = type_byte_order (value_type (v)) == BFD_ENDIAN_BIG;
- mask = (1 << nbits) - 1;
- if (bits_big_endian)
+ if (from != NULL)
{
- datum <<= 8 - (dest_offset_bits + nbits);
- mask <<= 8 - (dest_offset_bits + nbits);
+ from_contents = value_contents (from);
+ v_contents = NULL;
}
else
{
- datum <<= dest_offset_bits;
- mask <<= dest_offset_bits;
- }
-
- gdb_assert ((datum & ~mask) == 0);
-
- *dest = (*dest & ~mask) | datum;
-}
-
-/* Copy bits from a source to a destination.
-
- DEST is where the bits should be written.
- DEST_OFFSET_BITS is the bit offset into DEST.
- SOURCE is the source of bits.
- SOURCE_OFFSET_BITS is the bit offset into SOURCE.
- BIT_COUNT is the number of bits to copy.
- BITS_BIG_ENDIAN is taken directly from gdbarch. */
-
-static void
-copy_bitwise (gdb_byte *dest, unsigned int dest_offset_bits,
- const gdb_byte *source, unsigned int source_offset_bits,
- unsigned int bit_count,
- int bits_big_endian)
-{
- unsigned int dest_avail;
- int datum;
-
- /* Reduce everything to byte-size pieces. */
- dest += dest_offset_bits / 8;
- dest_offset_bits %= 8;
- source += source_offset_bits / 8;
- source_offset_bits %= 8;
-
- dest_avail = 8 - dest_offset_bits % 8;
-
- /* See if we can fill the first destination byte. */
- if (dest_avail < bit_count)
- {
- datum = extract_bits (&source, &source_offset_bits, dest_avail,
- bits_big_endian);
- insert_bits (datum, dest, dest_offset_bits, dest_avail, bits_big_endian);
- ++dest;
- dest_offset_bits = 0;
- bit_count -= dest_avail;
- }
-
- /* Now, either DEST_OFFSET_BITS is byte-aligned, or we have fewer
- than 8 bits remaining. */
- gdb_assert (dest_offset_bits % 8 == 0 || bit_count < 8);
- for (; bit_count >= 8; bit_count -= 8)
- {
- datum = extract_bits (&source, &source_offset_bits, 8, bits_big_endian);
- *dest++ = (gdb_byte) datum;
+ if (value_type (v) != value_enclosing_type (v))
+ internal_error (__FILE__, __LINE__,
+ _("Should not be able to create a lazy value with "
+ "an enclosing type"));
+ v_contents = value_contents_raw (v);
+ from_contents = NULL;
}
- /* Finally, we may have a few leftover bits. */
- gdb_assert (bit_count <= 8 - dest_offset_bits % 8);
- if (bit_count > 0)
- {
- datum = extract_bits (&source, &source_offset_bits, bit_count,
- bits_big_endian);
- insert_bits (datum, dest, dest_offset_bits, bit_count, bits_big_endian);
- }
-}
-
-static void
-read_pieced_value (struct value *v)
-{
- int i;
- long offset = 0;
- ULONGEST bits_to_skip;
- gdb_byte *contents;
- struct piece_closure *c
- = (struct piece_closure *) value_computed_closure (v);
- struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (v));
- size_t type_len;
- size_t buffer_size = 0;
- char *buffer = NULL;
- struct cleanup *cleanup;
- int bits_big_endian
- = gdbarch_bits_big_endian (get_type_arch (value_type (v)));
-
- if (value_type (v) != value_enclosing_type (v))
- internal_error (__FILE__, __LINE__,
- _("Should not be able to create a lazy value with "
- "an enclosing type"));
-
- cleanup = make_cleanup (free_current_contents, &buffer);
-
- contents = value_contents_raw (v);
bits_to_skip = 8 * value_offset (v);
if (value_bitsize (v))
{
- bits_to_skip += value_bitpos (v);
- type_len = value_bitsize (v);
+ bits_to_skip += (8 * value_offset (value_parent (v))
+ + value_bitpos (v));
+ if (from != NULL
+ && (type_byte_order (value_type (from))
+ == BFD_ENDIAN_BIG))
+ {
+ /* Use the least significant bits of FROM. */
+ max_offset = 8 * TYPE_LENGTH (value_type (from));
+ offset = max_offset - value_bitsize (v);
+ }
+ else
+ max_offset = value_bitsize (v);
}
else
- type_len = 8 * TYPE_LENGTH (value_type (v));
+ max_offset = 8 * TYPE_LENGTH (value_type (v));
+
+ /* Advance to the first non-skipped piece. */
+ for (i = 0; i < c->pieces.size () && bits_to_skip >= c->pieces[i].size; i++)
+ bits_to_skip -= c->pieces[i].size;
- for (i = 0; i < c->n_pieces && offset < type_len; i++)
+ for (; i < c->pieces.size () && offset < max_offset; i++)
{
struct dwarf_expr_piece *p = &c->pieces[i];
- size_t this_size, this_size_bits;
- long dest_offset_bits, source_offset_bits, source_offset;
- const gdb_byte *intermediate_buffer;
-
- /* Compute size, source, and destination offsets for copying, in
- bits. */
- this_size_bits = p->size;
- if (bits_to_skip > 0 && bits_to_skip >= this_size_bits)
- {
- bits_to_skip -= this_size_bits;
- continue;
- }
- if (this_size_bits > type_len - offset)
- this_size_bits = type_len - offset;
- if (bits_to_skip > 0)
- {
- dest_offset_bits = 0;
- source_offset_bits = bits_to_skip;
- this_size_bits -= bits_to_skip;
- bits_to_skip = 0;
- }
- else
- {
- dest_offset_bits = offset;
- source_offset_bits = 0;
- }
+ size_t this_size_bits, this_size;
- this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8;
- source_offset = source_offset_bits / 8;
- if (buffer_size < this_size)
- {
- buffer_size = this_size;
- buffer = xrealloc (buffer, buffer_size);
- }
- intermediate_buffer = buffer;
+ this_size_bits = p->size - bits_to_skip;
+ if (this_size_bits > max_offset - offset)
+ this_size_bits = max_offset - offset;
- /* Copy from the source to DEST_BUFFER. */
switch (p->location)
{
case DWARF_VALUE_REGISTER:
{
+ struct frame_info *frame = frame_find_by_id (c->frame_id);
struct gdbarch *arch = get_frame_arch (frame);
- int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, p->v.regno);
- int reg_offset = source_offset;
+ int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno);
+ ULONGEST reg_bits = 8 * register_size (arch, gdb_regnum);
+ int optim, unavail;
if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG
- && this_size < register_size (arch, gdb_regnum))
+ && p->offset + p->size < reg_bits)
{
/* Big-endian, and we want less than full size. */
- reg_offset = register_size (arch, gdb_regnum) - this_size;
- /* We want the lower-order THIS_SIZE_BITS of the bytes
- we extract from the register. */
- source_offset_bits += 8 * this_size - this_size_bits;
+ bits_to_skip += reg_bits - (p->offset + p->size);
}
+ else
+ bits_to_skip += p->offset;
- if (gdb_regnum != -1)
- {
- int optim, unavail;
+ this_size = bits_to_bytes (bits_to_skip, this_size_bits);
+ buffer.resize (this_size);
- if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset,
- this_size, buffer,
+ if (from == NULL)
+ {
+ /* Read mode. */
+ if (!get_frame_register_bytes (frame, gdb_regnum,
+ bits_to_skip / 8,
+ this_size, buffer.data (),
&optim, &unavail))
{
- /* Just so garbage doesn't ever shine through. */
- memset (buffer, 0, this_size);
-
if (optim)
- set_value_optimized_out (v, 1);
+ mark_value_bits_optimized_out (v, offset,
+ this_size_bits);
if (unavail)
- mark_value_bytes_unavailable (v, offset, this_size);
+ mark_value_bits_unavailable (v, offset,
+ this_size_bits);
+ break;
}
+
+ copy_bitwise (v_contents, offset,
+ buffer.data (), bits_to_skip % 8,
+ this_size_bits, bits_big_endian);
}
else
{
- error (_("Unable to access DWARF register number %s"),
- paddress (arch, p->v.regno));
+ /* Write mode. */
+ if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
+ {
+ /* Data is copied non-byte-aligned into the register.
+ Need some bits from original register value. */
+ get_frame_register_bytes (frame, gdb_regnum,
+ bits_to_skip / 8,
+ this_size, buffer.data (),
+ &optim, &unavail);
+ if (optim)
+ throw_error (OPTIMIZED_OUT_ERROR,
+ _("Can't do read-modify-write to "
+ "update bitfield; containing word "
+ "has been optimized out"));
+ if (unavail)
+ throw_error (NOT_AVAILABLE_ERROR,
+ _("Can't do read-modify-write to "
+ "update bitfield; containing word "
+ "is unavailable"));
+ }
+
+ copy_bitwise (buffer.data (), bits_to_skip % 8,
+ from_contents, offset,
+ this_size_bits, bits_big_endian);
+ put_frame_register_bytes (frame, gdb_regnum,
+ bits_to_skip / 8,
+ this_size, buffer.data ());
}
}
break;
case DWARF_VALUE_MEMORY:
- read_value_memory (v, offset,
- p->v.mem.in_stack_memory,
- p->v.mem.addr + source_offset,
- buffer, this_size);
- break;
-
- case DWARF_VALUE_STACK:
{
- size_t n = this_size;
+ bits_to_skip += p->offset;
+
+ CORE_ADDR start_addr = p->v.mem.addr + bits_to_skip / 8;
- if (n > c->addr_size - source_offset)
- n = (c->addr_size >= source_offset
- ? c->addr_size - source_offset
- : 0);
- if (n == 0)
+ if (bits_to_skip % 8 == 0 && this_size_bits % 8 == 0
+ && offset % 8 == 0)
{
- /* Nothing. */
+ /* Everything is byte-aligned; no buffer needed. */
+ if (from != NULL)
+ write_memory_with_notification (start_addr,
+ (from_contents
+ + offset / 8),
+ this_size_bits / 8);
+ else
+ read_value_memory (v, offset,
+ p->v.mem.in_stack_memory,
+ p->v.mem.addr + bits_to_skip / 8,
+ v_contents + offset / 8,
+ this_size_bits / 8);
+ break;
+ }
+
+ this_size = bits_to_bytes (bits_to_skip, this_size_bits);
+ buffer.resize (this_size);
+
+ if (from == NULL)
+ {
+ /* Read mode. */
+ read_value_memory (v, offset,
+ p->v.mem.in_stack_memory,
+ p->v.mem.addr + bits_to_skip / 8,
+ buffer.data (), this_size);
+ copy_bitwise (v_contents, offset,
+ buffer.data (), bits_to_skip % 8,
+ this_size_bits, bits_big_endian);
}
else
{
- const gdb_byte *val_bytes = value_contents_all (p->v.value);
+ /* Write mode. */
+ if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
+ {
+ if (this_size <= 8)
+ {
+ /* Perform a single read for small sizes. */
+ read_memory (start_addr, buffer.data (),
+ this_size);
+ }
+ else
+ {
+ /* Only the first and last bytes can possibly have
+ any bits reused. */
+ read_memory (start_addr, buffer.data (), 1);
+ read_memory (start_addr + this_size - 1,
+ &buffer[this_size - 1], 1);
+ }
+ }
- intermediate_buffer = val_bytes + source_offset;
+ copy_bitwise (buffer.data (), bits_to_skip % 8,
+ from_contents, offset,
+ this_size_bits, bits_big_endian);
+ write_memory_with_notification (start_addr,
+ buffer.data (),
+ this_size);
}
}
break;
+ case DWARF_VALUE_STACK:
+ {
+ if (from != NULL)
+ {
+ mark_value_bits_optimized_out (v, offset, this_size_bits);
+ break;
+ }
+
+ struct objfile *objfile = dwarf2_per_cu_objfile (c->per_cu);
+ struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile);
+ ULONGEST stack_value_size_bits
+ = 8 * TYPE_LENGTH (value_type (p->v.value));
+
+ /* Use zeroes if piece reaches beyond stack value. */
+ if (p->offset + p->size > stack_value_size_bits)
+ break;
+
+ /* Piece is anchored at least significant bit end. */
+ if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG)
+ bits_to_skip += stack_value_size_bits - p->offset - p->size;
+ else
+ bits_to_skip += p->offset;
+
+ copy_bitwise (v_contents, offset,
+ value_contents_all (p->v.value),
+ bits_to_skip,
+ this_size_bits, bits_big_endian);
+ }
+ break;
+
case DWARF_VALUE_LITERAL:
{
- size_t n = this_size;
-
- if (n > p->v.literal.length - source_offset)
- n = (p->v.literal.length >= source_offset
- ? p->v.literal.length - source_offset
- : 0);
- if (n != 0)
- intermediate_buffer = p->v.literal.data + source_offset;
+ if (from != NULL)
+ {
+ mark_value_bits_optimized_out (v, offset, this_size_bits);
+ break;
+ }
+
+ ULONGEST literal_size_bits = 8 * p->v.literal.length;
+ size_t n = this_size_bits;
+
+ /* Cut off at the end of the implicit value. */
+ bits_to_skip += p->offset;
+ if (bits_to_skip >= literal_size_bits)
+ break;
+ if (n > literal_size_bits - bits_to_skip)
+ n = literal_size_bits - bits_to_skip;
+
+ copy_bitwise (v_contents, offset,
+ p->v.literal.data, bits_to_skip,
+ n, bits_big_endian);
}
break;
- /* These bits show up as zeros -- but do not cause the value
- to be considered optimized-out. */
case DWARF_VALUE_IMPLICIT_POINTER:
+ if (from != NULL)
+ {
+ mark_value_bits_optimized_out (v, offset, this_size_bits);
+ break;
+ }
+
+ /* These bits show up as zeros -- but do not cause the value to
+ be considered optimized-out. */
break;
case DWARF_VALUE_OPTIMIZED_OUT:
- set_value_optimized_out (v, 1);
+ mark_value_bits_optimized_out (v, offset, this_size_bits);
break;
default:
internal_error (__FILE__, __LINE__, _("invalid location type"));
}
- if (p->location != DWARF_VALUE_OPTIMIZED_OUT
- && p->location != DWARF_VALUE_IMPLICIT_POINTER)
- copy_bitwise (contents, dest_offset_bits,
- intermediate_buffer, source_offset_bits % 8,
- this_size_bits, bits_big_endian);
-
offset += this_size_bits;
+ bits_to_skip = 0;
}
+}
- do_cleanups (cleanup);
+
+static void
+read_pieced_value (struct value *v)
+{
+ rw_pieced_value (v, NULL);
}
static void
write_pieced_value (struct value *to, struct value *from)
{
- int i;
- long offset = 0;
- ULONGEST bits_to_skip;
- const gdb_byte *contents;
- struct piece_closure *c
- = (struct piece_closure *) value_computed_closure (to);
- struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (to));
- size_t type_len;
- size_t buffer_size = 0;
- char *buffer = NULL;
- struct cleanup *cleanup;
- int bits_big_endian
- = gdbarch_bits_big_endian (get_type_arch (value_type (to)));
-
- if (frame == NULL)
- {
- set_value_optimized_out (to, 1);
- return;
- }
-
- cleanup = make_cleanup (free_current_contents, &buffer);
-
- contents = value_contents (from);
- bits_to_skip = 8 * value_offset (to);
- if (value_bitsize (to))
- {
- bits_to_skip += value_bitpos (to);
- type_len = value_bitsize (to);
- }
- else
- type_len = 8 * TYPE_LENGTH (value_type (to));
-
- for (i = 0; i < c->n_pieces && offset < type_len; i++)
- {
- struct dwarf_expr_piece *p = &c->pieces[i];
- size_t this_size_bits, this_size;
- long dest_offset_bits, source_offset_bits, dest_offset, source_offset;
- int need_bitwise;
- const gdb_byte *source_buffer;
-
- this_size_bits = p->size;
- if (bits_to_skip > 0 && bits_to_skip >= this_size_bits)
- {
- bits_to_skip -= this_size_bits;
- continue;
- }
- if (this_size_bits > type_len - offset)
- this_size_bits = type_len - offset;
- if (bits_to_skip > 0)
- {
- dest_offset_bits = bits_to_skip;
- source_offset_bits = 0;
- this_size_bits -= bits_to_skip;
- bits_to_skip = 0;
- }
- else
- {
- dest_offset_bits = 0;
- source_offset_bits = offset;
- }
-
- this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8;
- source_offset = source_offset_bits / 8;
- dest_offset = dest_offset_bits / 8;
- if (dest_offset_bits % 8 == 0 && source_offset_bits % 8 == 0)
- {
- source_buffer = contents + source_offset;
- need_bitwise = 0;
- }
- else
- {
- if (buffer_size < this_size)
- {
- buffer_size = this_size;
- buffer = xrealloc (buffer, buffer_size);
- }
- source_buffer = buffer;
- need_bitwise = 1;
- }
-
- switch (p->location)
- {
- case DWARF_VALUE_REGISTER:
- {
- struct gdbarch *arch = get_frame_arch (frame);
- int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, p->v.regno);
- int reg_offset = dest_offset;
-
- if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG
- && this_size <= register_size (arch, gdb_regnum))
- /* Big-endian, and we want less than full size. */
- reg_offset = register_size (arch, gdb_regnum) - this_size;
-
- if (gdb_regnum != -1)
- {
- if (need_bitwise)
- {
- int optim, unavail;
-
- if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset,
- this_size, buffer,
- &optim, &unavail))
- {
- if (optim)
- error (_("Can't do read-modify-write to "
- "update bitfield; containing word has been "
- "optimized out"));
- if (unavail)
- throw_error (NOT_AVAILABLE_ERROR,
- _("Can't do read-modify-write to update "
- "bitfield; containing word "
- "is unavailable"));
- }
- copy_bitwise (buffer, dest_offset_bits,
- contents, source_offset_bits,
- this_size_bits,
- bits_big_endian);
- }
-
- put_frame_register_bytes (frame, gdb_regnum, reg_offset,
- this_size, source_buffer);
- }
- else
- {
- error (_("Unable to write to DWARF register number %s"),
- paddress (arch, p->v.regno));
- }
- }
- break;
- case DWARF_VALUE_MEMORY:
- if (need_bitwise)
- {
- /* Only the first and last bytes can possibly have any
- bits reused. */
- read_memory (p->v.mem.addr + dest_offset, buffer, 1);
- read_memory (p->v.mem.addr + dest_offset + this_size - 1,
- buffer + this_size - 1, 1);
- copy_bitwise (buffer, dest_offset_bits,
- contents, source_offset_bits,
- this_size_bits,
- bits_big_endian);
- }
-
- write_memory (p->v.mem.addr + dest_offset,
- source_buffer, this_size);
- break;
- default:
- set_value_optimized_out (to, 1);
- break;
- }
- offset += this_size_bits;
- }
-
- do_cleanups (cleanup);
+ rw_pieced_value (to, from);
}
-/* A helper function that checks bit validity in a pieced value.
- CHECK_FOR indicates the kind of validity checking.
- DWARF_VALUE_MEMORY means to check whether any bit is valid.
- DWARF_VALUE_OPTIMIZED_OUT means to check whether any bit is
- optimized out.
- DWARF_VALUE_IMPLICIT_POINTER means to check whether the bits are an
- implicit pointer. */
+/* An implementation of an lval_funcs method to see whether a value is
+ a synthetic pointer. */
static int
-check_pieced_value_bits (const struct value *value, int bit_offset,
- int bit_length,
- enum dwarf_value_location check_for)
+check_pieced_synthetic_pointer (const struct value *value, LONGEST bit_offset,
+ int bit_length)
{
struct piece_closure *c
= (struct piece_closure *) value_computed_closure (value);
int i;
- int validity = (check_for == DWARF_VALUE_MEMORY
- || check_for == DWARF_VALUE_IMPLICIT_POINTER);
bit_offset += 8 * value_offset (value);
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;
else
bit_length -= this_size_bits;
- if (check_for == DWARF_VALUE_IMPLICIT_POINTER)
- {
- if (p->location != DWARF_VALUE_IMPLICIT_POINTER)
- return 0;
- }
- else if (p->location == DWARF_VALUE_OPTIMIZED_OUT
- || p->location == DWARF_VALUE_IMPLICIT_POINTER)
- {
- if (validity)
- return 0;
- }
- else
- {
- if (!validity)
- return 1;
- }
+ if (p->location != DWARF_VALUE_IMPLICIT_POINTER)
+ return 0;
}
- return validity;
+ return 1;
}
-static int
-check_pieced_value_validity (const struct value *value, int bit_offset,
- int bit_length)
-{
- return check_pieced_value_bits (value, bit_offset, bit_length,
- DWARF_VALUE_MEMORY);
-}
+/* A wrapper function for get_frame_address_in_block. */
-static int
-check_pieced_value_invalid (const struct value *value)
+static CORE_ADDR
+get_frame_address_in_block_wrapper (void *baton)
{
- return check_pieced_value_bits (value, 0,
- 8 * TYPE_LENGTH (value_type (value)),
- DWARF_VALUE_OPTIMIZED_OUT);
+ return get_frame_address_in_block ((struct frame_info *) baton);
}
-/* An implementation of an lval_funcs method to see whether a value is
- a synthetic pointer. */
+/* Fetch a DW_AT_const_value through a synthetic pointer. */
-static int
-check_pieced_synthetic_pointer (const struct value *value, int bit_offset,
- int bit_length)
+static struct value *
+fetch_const_value_from_synthetic_pointer (sect_offset die, LONGEST byte_offset,
+ struct dwarf2_per_cu_data *per_cu,
+ struct type *type)
{
- return check_pieced_value_bits (value, bit_offset, bit_length,
- DWARF_VALUE_IMPLICIT_POINTER);
+ struct value *result = NULL;
+ const gdb_byte *bytes;
+ LONGEST len;
+
+ auto_obstack temp_obstack;
+ bytes = dwarf2_fetch_constant_bytes (die, per_cu, &temp_obstack, &len);
+
+ if (bytes != NULL)
+ {
+ if (byte_offset >= 0
+ && byte_offset + TYPE_LENGTH (TYPE_TARGET_TYPE (type)) <= len)
+ {
+ bytes += byte_offset;
+ result = value_from_contents (TYPE_TARGET_TYPE (type), bytes);
+ }
+ else
+ invalid_synthetic_pointer ();
+ }
+ else
+ result = allocate_optimized_out_value (TYPE_TARGET_TYPE (type));
+
+ return result;
}
-/* A wrapper function for get_frame_address_in_block. */
+/* Fetch the value pointed to by a synthetic pointer. */
-static CORE_ADDR
-get_frame_address_in_block_wrapper (void *baton)
+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)
{
- return get_frame_address_in_block (baton);
+ /* 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,
+ resolve_abstract_p);
+
+ /* Get type of pointed-to DIE. */
+ struct type *orig_type = dwarf2_fetch_die_type_sect_off (die, per_cu);
+ if (orig_type == NULL)
+ invalid_synthetic_pointer ();
+
+ /* If pointed-to DIE has a DW_AT_location, evaluate it and return the
+ resulting value. Otherwise, it may have a DW_AT_const_value instead,
+ or it may've been optimized out. */
+ if (baton.data != NULL)
+ return dwarf2_evaluate_loc_desc_full (orig_type, frame, baton.data,
+ baton.size, baton.per_cu,
+ TYPE_TARGET_TYPE (type),
+ byte_offset);
+ else
+ return fetch_const_value_from_synthetic_pointer (die, byte_offset, per_cu,
+ type);
}
/* An implementation of an lval_funcs method to indirect through a
= (struct piece_closure *) value_computed_closure (value);
struct type *type;
struct frame_info *frame;
- struct dwarf2_locexpr_baton baton;
- int i, bit_offset, bit_length;
+ int i, bit_length;
+ LONGEST bit_offset;
struct dwarf_expr_piece *piece = NULL;
LONGEST byte_offset;
+ enum bfd_endian byte_order;
type = check_typedef (value_type (value));
if (TYPE_CODE (type) != TYPE_CODE_PTR)
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;
return NULL;
if (bit_length != 0)
- error (_("Invalid use of DW_OP_GNU_implicit_pointer"));
+ error (_("Invalid use of DW_OP_implicit_pointer"));
piece = p;
break;
}
+ gdb_assert (piece != NULL);
frame = get_selected_frame (_("No frame selected."));
- /* This is an offset requested by GDB, such as value subcripts. */
- byte_offset = value_as_address (value);
+ /* This is an offset requested by GDB, such as value subscripts.
+ However, due to how synthetic pointers are implemented, this is
+ always presented to us as a pointer type. This means we have to
+ sign-extend it manually as appropriate. Use raw
+ extract_signed_integer directly rather than value_as_address and
+ sign extend afterwards on architectures that would need it
+ (mostly everywhere except MIPS, which has signed addresses) as
+ the later would go through gdbarch_pointer_to_address and thus
+ return a CORE_ADDR with high bits set on architectures that
+ encode address spaces and other things in CORE_ADDR. */
+ byte_order = gdbarch_byte_order (get_frame_arch (frame));
+ byte_offset = extract_signed_integer (value_contents (value),
+ TYPE_LENGTH (type), byte_order);
+ byte_offset += piece->v.ptr.offset;
+
+ return indirect_synthetic_pointer (piece->v.ptr.die_sect_off,
+ byte_offset, c->per_cu,
+ frame, type);
+}
+
+/* Implementation of the coerce_ref method of lval_funcs for synthetic C++
+ references. */
- gdb_assert (piece);
- baton = dwarf2_fetch_die_location_block (piece->v.ptr.die, c->per_cu,
- get_frame_address_in_block_wrapper,
- frame);
+static struct value *
+coerce_pieced_ref (const struct value *value)
+{
+ struct type *type = check_typedef (value_type (value));
- return dwarf2_evaluate_loc_desc_full (TYPE_TARGET_TYPE (type), frame,
- baton.data, baton.size, baton.per_cu,
- piece->v.ptr.offset + byte_offset);
+ if (value_bits_synthetic_pointer (value, value_embedded_offset (value),
+ TARGET_CHAR_BIT * TYPE_LENGTH (type)))
+ {
+ const struct piece_closure *closure
+ = (struct piece_closure *) value_computed_closure (value);
+ struct frame_info *frame
+ = get_selected_frame (_("No frame selected."));
+
+ /* gdb represents synthetic pointers as pieced values with a single
+ piece. */
+ gdb_assert (closure != NULL);
+ gdb_assert (closure->pieces.size () == 1);
+
+ return indirect_synthetic_pointer
+ (closure->pieces[0].v.ptr.die_sect_off,
+ closure->pieces[0].v.ptr.offset,
+ closure->per_cu, frame, type);
+ }
+ else
+ {
+ /* Else: not a synthetic reference; do nothing. */
+ return NULL;
+ }
}
static void *
--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;
}
}
static const struct lval_funcs pieced_value_funcs = {
read_pieced_value,
write_pieced_value,
- check_pieced_value_validity,
- check_pieced_value_invalid,
indirect_pieced_value,
- NULL, /* coerce_ref */
+ coerce_pieced_ref,
check_pieced_synthetic_pointer,
copy_pieced_value_closure,
free_pieced_value_closure
};
-/* Helper function which throws an error if a synthetic pointer is
- invalid. */
-
-static void
-invalid_synthetic_pointer (void)
-{
- error (_("access outside bounds of object "
- "referenced via synthetic pointer"));
-}
-
-/* Virtual method table for dwarf2_evaluate_loc_desc_full below. */
-
-static const struct dwarf_expr_context_funcs dwarf_expr_ctx_funcs =
-{
- dwarf_expr_read_reg,
- dwarf_expr_read_mem,
- dwarf_expr_frame_base,
- dwarf_expr_frame_cfa,
- dwarf_expr_frame_pc,
- dwarf_expr_tls_address,
- dwarf_expr_dwarf_call,
- dwarf_expr_get_base_type,
- dwarf_expr_push_dwarf_reg_entry_value,
- dwarf_expr_get_addr_index
-};
-
/* Evaluate a location description, starting at DATA and with length
SIZE, to find the current location of variable of TYPE in the
- context of FRAME. BYTE_OFFSET is applied after the contents are
- computed. */
+ context of FRAME. If SUBOBJ_TYPE is non-NULL, return instead the
+ location of the subobject of type SUBOBJ_TYPE at byte offset
+ SUBOBJ_BYTE_OFFSET within the variable of type TYPE. */
static struct value *
dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame,
- const gdb_byte *data, unsigned short size,
+ const gdb_byte *data, size_t size,
struct dwarf2_per_cu_data *per_cu,
- LONGEST byte_offset)
+ struct type *subobj_type,
+ LONGEST subobj_byte_offset)
{
struct value *retval;
- struct dwarf_expr_baton baton;
- struct dwarf_expr_context *ctx;
- struct cleanup *old_chain, *value_chain;
struct objfile *objfile = dwarf2_per_cu_objfile (per_cu);
- volatile struct gdb_exception ex;
- if (byte_offset < 0)
+ if (subobj_type == NULL)
+ {
+ subobj_type = type;
+ subobj_byte_offset = 0;
+ }
+ else if (subobj_byte_offset < 0)
invalid_synthetic_pointer ();
if (size == 0)
- return allocate_optimized_out_value (type);
+ return allocate_optimized_out_value (subobj_type);
- baton.frame = frame;
- baton.per_cu = per_cu;
+ dwarf_evaluate_loc_desc ctx;
+ ctx.frame = frame;
+ ctx.per_cu = per_cu;
+ ctx.obj_address = 0;
- ctx = new_dwarf_expr_context ();
- old_chain = make_cleanup_free_dwarf_expr_context (ctx);
- value_chain = make_cleanup_value_free_to_mark (value_mark ());
+ scoped_value_mark free_values;
- ctx->gdbarch = get_objfile_arch (objfile);
- ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
- ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu);
- ctx->offset = dwarf2_per_cu_text_offset (per_cu);
- ctx->baton = &baton;
- ctx->funcs = &dwarf_expr_ctx_funcs;
+ ctx.gdbarch = get_objfile_arch (objfile);
+ ctx.addr_size = dwarf2_per_cu_addr_size (per_cu);
+ ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu);
+ ctx.offset = dwarf2_per_cu_text_offset (per_cu);
- TRY_CATCH (ex, RETURN_MASK_ERROR)
+ try
{
- dwarf_expr_eval (ctx, data, size);
+ ctx.eval (data, size);
}
- if (ex.reason < 0)
+ catch (const gdb_exception_error &ex)
{
if (ex.error == NOT_AVAILABLE_ERROR)
{
- do_cleanups (old_chain);
- retval = allocate_value (type);
- mark_value_bytes_unavailable (retval, 0, TYPE_LENGTH (type));
+ free_values.free_to_mark ();
+ retval = allocate_value (subobj_type);
+ mark_value_bytes_unavailable (retval, 0,
+ TYPE_LENGTH (subobj_type));
return retval;
}
else if (ex.error == NO_ENTRY_VALUE_ERROR)
{
if (entry_values_debug)
exception_print (gdb_stdout, ex);
- do_cleanups (old_chain);
- return allocate_optimized_out_value (type);
+ free_values.free_to_mark ();
+ return allocate_optimized_out_value (subobj_type);
}
else
- throw_exception (ex);
+ throw;
}
- if (ctx->num_pieces > 0)
+ if (ctx.pieces.size () > 0)
{
struct piece_closure *c;
- struct frame_id frame_id = get_frame_id (frame);
ULONGEST bit_size = 0;
- int i;
- for (i = 0; i < ctx->num_pieces; ++i)
- bit_size += ctx->pieces[i].size;
- if (8 * (byte_offset + TYPE_LENGTH (type)) > bit_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,
- ctx->addr_size);
+ 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. */
- do_cleanups (value_chain);
- retval = allocate_computed_value (type, &pieced_value_funcs, c);
- VALUE_FRAME_ID (retval) = frame_id;
- set_value_offset (retval, byte_offset);
+ free_values.free_to_mark ();
+ retval = allocate_computed_value (subobj_type,
+ &pieced_value_funcs, c);
+ set_value_offset (retval, subobj_byte_offset);
}
else
{
- switch (ctx->location)
+ switch (ctx.location)
{
case DWARF_VALUE_REGISTER:
{
struct gdbarch *arch = get_frame_arch (frame);
- ULONGEST dwarf_regnum = value_as_long (dwarf_expr_fetch (ctx, 0));
- int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_regnum);
+ int dwarf_regnum
+ = longest_to_int (value_as_long (ctx.fetch (0)));
+ int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, dwarf_regnum);
- if (byte_offset != 0)
+ if (subobj_byte_offset != 0)
error (_("cannot use offset on synthetic pointer to register"));
- do_cleanups (value_chain);
- if (gdb_regnum != -1)
- retval = value_from_register (type, gdb_regnum, frame);
- else
- error (_("Unable to access DWARF register number %s"),
- paddress (arch, dwarf_regnum));
+ free_values.free_to_mark ();
+ retval = value_from_register (subobj_type, gdb_regnum, frame);
+ if (value_optimized_out (retval))
+ {
+ struct value *tmp;
+
+ /* This means the register has undefined value / was
+ not saved. As we're computing the location of some
+ variable etc. in the program, not a value for
+ inspecting a register ($pc, $sp, etc.), return a
+ generic optimized out value instead, so that we show
+ <optimized out> instead of <not saved>. */
+ tmp = allocate_value (subobj_type);
+ value_contents_copy (tmp, 0, retval, 0,
+ TYPE_LENGTH (subobj_type));
+ retval = tmp;
+ }
}
break;
case DWARF_VALUE_MEMORY:
{
- CORE_ADDR address = dwarf_expr_fetch_address (ctx, 0);
- int in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0);
+ struct type *ptr_type;
+ CORE_ADDR address = ctx.fetch_address (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
+ pointer to address conversion would be performed as part
+ of those operations, but the type of the object to
+ which the address refers is not known at the time of
+ the operation. Therefore, we do the conversion here
+ since the type is readily available. */
+
+ switch (TYPE_CODE (subobj_type))
+ {
+ case TYPE_CODE_FUNC:
+ case TYPE_CODE_METHOD:
+ ptr_type = builtin_type (ctx.gdbarch)->builtin_func_ptr;
+ break;
+ default:
+ ptr_type = builtin_type (ctx.gdbarch)->builtin_data_ptr;
+ break;
+ }
+ address = value_as_address (value_from_pointer (ptr_type, address));
- do_cleanups (value_chain);
- retval = allocate_value_lazy (type);
- VALUE_LVAL (retval) = lval_memory;
+ free_values.free_to_mark ();
+ retval = value_at_lazy (subobj_type,
+ address + subobj_byte_offset);
if (in_stack_memory)
set_value_stack (retval, 1);
- set_value_address (retval, address + byte_offset);
}
break;
case DWARF_VALUE_STACK:
{
- struct value *value = dwarf_expr_fetch (ctx, 0);
- gdb_byte *contents;
- const gdb_byte *val_bytes;
+ struct value *value = ctx.fetch (0);
size_t n = TYPE_LENGTH (value_type (value));
+ size_t len = TYPE_LENGTH (subobj_type);
+ size_t max = TYPE_LENGTH (type);
+ struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile);
- if (byte_offset + TYPE_LENGTH (type) > n)
+ if (subobj_byte_offset + len > max)
invalid_synthetic_pointer ();
- val_bytes = value_contents_all (value);
- val_bytes += byte_offset;
- n -= byte_offset;
-
/* Preserve VALUE because we are going to free values back
to the mark, but we still need the value contents
below. */
- value_incref (value);
- do_cleanups (value_chain);
- make_cleanup_value_free (value);
+ value_ref_ptr value_holder = value_ref_ptr::new_reference (value);
+ free_values.free_to_mark ();
- retval = allocate_value (type);
- contents = value_contents_raw (retval);
- if (n > TYPE_LENGTH (type))
- {
- struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile);
+ retval = allocate_value (subobj_type);
- if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG)
- val_bytes += n - TYPE_LENGTH (type);
- n = TYPE_LENGTH (type);
- }
- memcpy (contents, val_bytes, n);
+ /* The given offset is relative to the actual object. */
+ if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG)
+ subobj_byte_offset += n - max;
+
+ memcpy (value_contents_raw (retval),
+ value_contents_all (value) + subobj_byte_offset, len);
}
break;
case DWARF_VALUE_LITERAL:
{
bfd_byte *contents;
- const bfd_byte *ldata;
- size_t n = ctx->len;
+ size_t n = TYPE_LENGTH (subobj_type);
- if (byte_offset + TYPE_LENGTH (type) > n)
+ if (subobj_byte_offset + n > ctx.len)
invalid_synthetic_pointer ();
- do_cleanups (value_chain);
- retval = allocate_value (type);
+ free_values.free_to_mark ();
+ retval = allocate_value (subobj_type);
contents = value_contents_raw (retval);
-
- ldata = ctx->data + byte_offset;
- n -= byte_offset;
-
- if (n > TYPE_LENGTH (type))
- {
- struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile);
-
- if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG)
- ldata += n - TYPE_LENGTH (type);
- n = TYPE_LENGTH (type);
- }
- memcpy (contents, ldata, n);
+ memcpy (contents, ctx.data + subobj_byte_offset, n);
}
break;
case DWARF_VALUE_OPTIMIZED_OUT:
- do_cleanups (value_chain);
- retval = allocate_optimized_out_value (type);
+ free_values.free_to_mark ();
+ retval = allocate_optimized_out_value (subobj_type);
break;
/* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced
}
}
- set_value_initialized (retval, ctx->initialized);
-
- do_cleanups (old_chain);
+ set_value_initialized (retval, ctx.initialized);
return retval;
}
struct value *
dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
- const gdb_byte *data, unsigned short size,
+ const gdb_byte *data, size_t size,
struct dwarf2_per_cu_data *per_cu)
{
- return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, 0);
+ return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu,
+ NULL, 0);
}
-\f
-/* Helper functions and baton for dwarf2_loc_desc_needs_frame. */
+/* Evaluates a dwarf expression and stores the result in VAL, expecting
+ that the dwarf expression only produces a single CORE_ADDR. FRAME is the
+ frame in which the expression is evaluated. ADDR is a context (location of
+ a variable) and might be needed to evaluate the location expression.
+ Returns 1 on success, 0 otherwise. */
-struct needs_frame_baton
+static int
+dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton,
+ struct frame_info *frame,
+ CORE_ADDR addr,
+ CORE_ADDR *valp)
{
- int needs_frame;
- struct dwarf2_per_cu_data *per_cu;
-};
+ struct objfile *objfile;
-/* Reads from registers do require a frame. */
-static CORE_ADDR
-needs_frame_read_reg (void *baton, int regnum)
-{
- struct needs_frame_baton *nf_baton = baton;
+ if (dlbaton == NULL || dlbaton->size == 0)
+ return 0;
- nf_baton->needs_frame = 1;
- return 1;
-}
+ dwarf_evaluate_loc_desc ctx;
-/* Reads from memory do not require a frame. */
-static void
-needs_frame_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len)
-{
- memset (buf, 0, len);
-}
+ ctx.frame = frame;
+ ctx.per_cu = dlbaton->per_cu;
+ ctx.obj_address = addr;
-/* Frame-relative accesses do require a frame. */
-static void
-needs_frame_frame_base (void *baton, const gdb_byte **start, size_t * length)
-{
- static gdb_byte lit0 = DW_OP_lit0;
- struct needs_frame_baton *nf_baton = baton;
+ objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
+
+ ctx.gdbarch = get_objfile_arch (objfile);
+ ctx.addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
+ ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (dlbaton->per_cu);
+ ctx.offset = dwarf2_per_cu_text_offset (dlbaton->per_cu);
+
+ try
+ {
+ ctx.eval (dlbaton->data, dlbaton->size);
+ }
+ catch (const gdb_exception_error &ex)
+ {
+ 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;
+ }
- *start = &lit0;
- *length = 1;
+ switch (ctx.location)
+ {
+ case DWARF_VALUE_REGISTER:
+ case DWARF_VALUE_MEMORY:
+ case DWARF_VALUE_STACK:
+ *valp = ctx.fetch_address (0);
+ if (ctx.location == DWARF_VALUE_REGISTER)
+ *valp = ctx.read_addr_from_reg (*valp);
+ return 1;
+ case DWARF_VALUE_LITERAL:
+ *valp = extract_signed_integer (ctx.data, ctx.len,
+ gdbarch_byte_order (ctx.gdbarch));
+ return 1;
+ /* Unsupported dwarf values. */
+ case DWARF_VALUE_OPTIMIZED_OUT:
+ case DWARF_VALUE_IMPLICIT_POINTER:
+ break;
+ }
- nf_baton->needs_frame = 1;
+ return 0;
}
-/* CFA accesses require a frame. */
+/* See dwarf2loc.h. */
-static CORE_ADDR
-needs_frame_frame_cfa (void *baton)
+bool
+dwarf2_evaluate_property (const struct dynamic_prop *prop,
+ struct frame_info *frame,
+ struct property_addr_info *addr_stack,
+ CORE_ADDR *value)
{
- struct needs_frame_baton *nf_baton = baton;
+ if (prop == NULL)
+ return false;
- nf_baton->needs_frame = 1;
- return 1;
-}
+ if (frame == NULL && has_stack_frames ())
+ frame = get_selected_frame (NULL);
-/* Thread-local accesses do require a frame. */
-static CORE_ADDR
-needs_frame_tls_address (void *baton, CORE_ADDR offset)
-{
- struct needs_frame_baton *nf_baton = baton;
+ switch (prop->kind)
+ {
+ case PROP_LOCEXPR:
+ {
+ const struct dwarf2_property_baton *baton
+ = (const struct dwarf2_property_baton *) prop->data.baton;
+ gdb_assert (baton->property_type != NULL);
- nf_baton->needs_frame = 1;
- return 1;
-}
+ if (dwarf2_locexpr_baton_eval (&baton->locexpr, frame,
+ addr_stack ? addr_stack->addr : 0,
+ value))
+ {
+ if (baton->locexpr.is_reference)
+ {
+ struct value *val = value_at (baton->property_type, *value);
+ *value = value_as_address (val);
+ }
+ else
+ {
+ gdb_assert (baton->property_type != NULL);
-/* Helper interface of per_cu_dwarf_call for dwarf2_loc_desc_needs_frame. */
+ struct type *type = check_typedef (baton->property_type);
+ if (TYPE_LENGTH (type) < sizeof (CORE_ADDR)
+ && !TYPE_UNSIGNED (type))
+ {
+ /* If we have a valid return candidate and it's value
+ is signed, we have to sign-extend the value because
+ CORE_ADDR on 64bit machine has 8 bytes but address
+ size of an 32bit application is bytes. */
+ const int addr_size
+ = (dwarf2_per_cu_addr_size (baton->locexpr.per_cu)
+ * TARGET_CHAR_BIT);
+ const CORE_ADDR neg_mask
+ = (~((CORE_ADDR) 0) << (addr_size - 1));
+
+ /* Check if signed bit is set and sign-extend values. */
+ if (*value & neg_mask)
+ *value |= neg_mask;
+ }
+ }
+ return true;
+ }
+ }
+ break;
-static void
-needs_frame_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset)
-{
- struct needs_frame_baton *nf_baton = ctx->baton;
+ case PROP_LOCLIST:
+ {
+ struct dwarf2_property_baton *baton
+ = (struct dwarf2_property_baton *) prop->data.baton;
+ CORE_ADDR pc = get_frame_address_in_block (frame);
+ const gdb_byte *data;
+ struct value *val;
+ size_t size;
- per_cu_dwarf_call (ctx, die_offset, nf_baton->per_cu,
- ctx->funcs->get_frame_pc, ctx->baton);
-}
+ data = dwarf2_find_location_expression (&baton->loclist, &size, pc);
+ if (data != NULL)
+ {
+ val = dwarf2_evaluate_loc_desc (baton->property_type, frame, data,
+ size, baton->loclist.per_cu);
+ if (!value_optimized_out (val))
+ {
+ *value = value_as_address (val);
+ return true;
+ }
+ }
+ }
+ break;
-/* DW_OP_GNU_entry_value accesses require a caller, therefore a frame. */
+ case PROP_CONST:
+ *value = prop->data.const_val;
+ return true;
-static void
-needs_dwarf_reg_entry_value (struct dwarf_expr_context *ctx,
- int dwarf_reg, CORE_ADDR fb_offset, int deref_size)
-{
- struct needs_frame_baton *nf_baton = ctx->baton;
+ case PROP_ADDR_OFFSET:
+ {
+ struct dwarf2_property_baton *baton
+ = (struct dwarf2_property_baton *) prop->data.baton;
+ struct property_addr_info *pinfo;
+ struct value *val;
- nf_baton->needs_frame = 1;
+ for (pinfo = addr_stack; pinfo != NULL; pinfo = pinfo->next)
+ {
+ /* This approach lets us avoid checking the qualifiers. */
+ if (TYPE_MAIN_TYPE (pinfo->type)
+ == TYPE_MAIN_TYPE (baton->property_type))
+ break;
+ }
+ if (pinfo == NULL)
+ error (_("cannot find reference address for offset property"));
+ if (pinfo->valaddr != NULL)
+ val = value_from_contents
+ (baton->offset_info.type,
+ pinfo->valaddr + baton->offset_info.offset);
+ else
+ val = value_at (baton->offset_info.type,
+ pinfo->addr + baton->offset_info.offset);
+ *value = value_as_address (val);
+ return true;
+ }
+ }
+
+ return false;
}
-/* DW_OP_GNU_addr_index doesn't require a frame. */
+/* See dwarf2loc.h. */
-static CORE_ADDR
-needs_get_addr_index (void *baton, unsigned int index)
+void
+dwarf2_compile_property_to_c (string_file *stream,
+ const char *result_name,
+ struct gdbarch *gdbarch,
+ unsigned char *registers_used,
+ const struct dynamic_prop *prop,
+ CORE_ADDR pc,
+ struct symbol *sym)
{
- /* Nothing to do. */
- return 1;
+ struct dwarf2_property_baton *baton
+ = (struct dwarf2_property_baton *) prop->data.baton;
+ const gdb_byte *data;
+ size_t size;
+ struct dwarf2_per_cu_data *per_cu;
+
+ if (prop->kind == PROP_LOCEXPR)
+ {
+ data = baton->locexpr.data;
+ size = baton->locexpr.size;
+ per_cu = baton->locexpr.per_cu;
+ }
+ else
+ {
+ gdb_assert (prop->kind == PROP_LOCLIST);
+
+ data = dwarf2_find_location_expression (&baton->loclist, &size, pc);
+ per_cu = baton->loclist.per_cu;
+ }
+
+ compile_dwarf_bounds_to_c (stream, result_name, prop, sym, pc,
+ gdbarch, registers_used,
+ dwarf2_per_cu_addr_size (per_cu),
+ data, data + size, per_cu);
}
-/* Virtual method table for dwarf2_loc_desc_needs_frame below. */
+\f
+/* Helper functions and baton for dwarf2_loc_desc_get_symbol_read_needs. */
-static const struct dwarf_expr_context_funcs needs_frame_ctx_funcs =
+class symbol_needs_eval_context : public dwarf_expr_context
{
- needs_frame_read_reg,
- needs_frame_read_mem,
- needs_frame_frame_base,
- needs_frame_frame_cfa,
- needs_frame_frame_cfa, /* get_frame_pc */
- needs_frame_tls_address,
- needs_frame_dwarf_call,
- NULL, /* get_base_type */
- needs_dwarf_reg_entry_value,
- needs_get_addr_index
+ public:
+
+ enum symbol_needs_kind needs;
+ struct dwarf2_per_cu_data *per_cu;
+
+ /* Reads from registers do require a frame. */
+ 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
+ {
+ 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
+ {
+ memset (buf, 0, len);
+ }
+
+ /* Frame-relative accesses do require a frame. */
+ void get_frame_base (const gdb_byte **start, size_t *length) override
+ {
+ static gdb_byte lit0 = DW_OP_lit0;
+
+ *start = &lit0;
+ *length = 1;
+
+ needs = SYMBOL_NEEDS_FRAME;
+ }
+
+ /* CFA accesses require a frame. */
+ CORE_ADDR get_frame_cfa () override
+ {
+ needs = SYMBOL_NEEDS_FRAME;
+ return 1;
+ }
+
+ 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
+ {
+ if (needs <= SYMBOL_NEEDS_REGISTERS)
+ needs = SYMBOL_NEEDS_REGISTERS;
+ return 1;
+ }
+
+ /* Helper interface of per_cu_dwarf_call for
+ dwarf2_loc_desc_get_symbol_read_needs. */
+
+ 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
+ {
+ needs = SYMBOL_NEEDS_FRAME;
+
+ /* The expression may require some stub values on DWARF stack. */
+ push_address (0, 0);
+ }
+
+ /* DW_OP_addrx and DW_OP_GNU_addr_index doesn't require a frame. */
+
+ 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
+ {
+ /* Nothing to do. */
+ return 1;
+ }
};
-/* Return non-zero iff the location expression at DATA (length SIZE)
- requires a frame to evaluate. */
+/* Compute the correct symbol_needs_kind value for the location
+ expression at DATA (length SIZE). */
-static int
-dwarf2_loc_desc_needs_frame (const gdb_byte *data, unsigned short size,
- struct dwarf2_per_cu_data *per_cu)
+static enum symbol_needs_kind
+dwarf2_loc_desc_get_symbol_read_needs (const gdb_byte *data, size_t size,
+ struct dwarf2_per_cu_data *per_cu)
{
- struct needs_frame_baton baton;
- struct dwarf_expr_context *ctx;
int in_reg;
- struct cleanup *old_chain;
struct objfile *objfile = dwarf2_per_cu_objfile (per_cu);
- baton.needs_frame = 0;
- baton.per_cu = per_cu;
-
- ctx = new_dwarf_expr_context ();
- old_chain = make_cleanup_free_dwarf_expr_context (ctx);
- make_cleanup_value_free_to_mark (value_mark ());
+ scoped_value_mark free_values;
- ctx->gdbarch = get_objfile_arch (objfile);
- ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
- ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu);
- ctx->offset = dwarf2_per_cu_text_offset (per_cu);
- ctx->baton = &baton;
- ctx->funcs = &needs_frame_ctx_funcs;
+ symbol_needs_eval_context ctx;
- dwarf_expr_eval (ctx, data, size);
+ ctx.needs = SYMBOL_NEEDS_NONE;
+ ctx.per_cu = per_cu;
+ ctx.gdbarch = get_objfile_arch (objfile);
+ ctx.addr_size = dwarf2_per_cu_addr_size (per_cu);
+ ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu);
+ ctx.offset = dwarf2_per_cu_text_offset (per_cu);
- in_reg = ctx->location == DWARF_VALUE_REGISTER;
+ ctx.eval (data, size);
- 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;
- }
+ in_reg = ctx.location == DWARF_VALUE_REGISTER;
- do_cleanups (old_chain);
+ /* 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;
- return baton.needs_frame || in_reg;
+ if (in_reg)
+ ctx.needs = SYMBOL_NEEDS_FRAME;
+ return ctx.needs;
}
/* 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);
op);
}
-/* A helper function to convert a DWARF register to an arch register.
- ARCH is the architecture.
- DWARF_REG is the register.
- This will throw an exception if the DWARF register cannot be
- translated to an architecture register. */
+/* See dwarf2loc.h.
-static int
-translate_register (struct gdbarch *arch, int dwarf_reg)
+ This is basically a wrapper on gdbarch_dwarf2_reg_to_regnum so that we
+ can issue a complaint, which is better than having every target's
+ implementation of dwarf2_reg_to_regnum do it. */
+
+int
+dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg)
{
int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg);
+
+ if (reg == -1)
+ {
+ complaint (_("bad DWARF register number %d"), dwarf_reg);
+ }
+ return reg;
+}
+
+/* Subroutine of dwarf_reg_to_regnum_or_error to simplify it.
+ Throw an error because DWARF_REG is bad. */
+
+static void
+throw_bad_regnum_error (ULONGEST dwarf_reg)
+{
+ /* Still want to print -1 as "-1".
+ We *could* have int and ULONGEST versions of dwarf2_reg_to_regnum_or_error
+ but that's overkill for now. */
+ if ((int) dwarf_reg == dwarf_reg)
+ error (_("Unable to access DWARF register number %d"), (int) dwarf_reg);
+ error (_("Unable to access DWARF register number %s"),
+ pulongest (dwarf_reg));
+}
+
+/* See dwarf2loc.h. */
+
+int
+dwarf_reg_to_regnum_or_error (struct gdbarch *arch, ULONGEST dwarf_reg)
+{
+ int reg;
+
+ if (dwarf_reg > INT_MAX)
+ throw_bad_regnum_error (dwarf_reg);
+ /* Yes, we will end up issuing a complaint and an error if DWARF_REG is
+ bad, but that's ok. */
+ reg = dwarf_reg_to_regnum (arch, (int) dwarf_reg);
if (reg == -1)
- error (_("Unable to access DWARF register number %d"), dwarf_reg);
+ throw_bad_regnum_error (dwarf_reg);
return reg;
}
{
ULONGEST nbytes = (nbits + 7) / 8;
- gdb_assert (nbits > 0 && nbits <= sizeof (LONGEST));
+ gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST));
- if (trace_kludge)
+ if (expr->tracing)
ax_trace_quick (expr, nbytes);
if (nbits <= 8)
if (8 * nbytes == nbits)
return;
- if (gdbarch_bits_big_endian (arch))
+ if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG)
{
/* On a bits-big-endian machine, we want the high-order
NBITS. */
static CORE_ADDR
get_ax_pc (void *baton)
{
- struct agent_expr *expr = baton;
+ struct agent_expr *expr = (struct agent_expr *) baton;
return expr->scope;
}
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)
{
- struct cleanup *cleanups;
- int i, *offsets;
- VEC(int) *dw_labels = NULL, *patches = NULL;
+ gdbarch *arch = expr->gdbarch;
+ std::vector<int> dw_labels, patches;
const gdb_byte * const base = op_ptr;
const gdb_byte *previous_piece = op_ptr;
enum bfd_endian byte_order = gdbarch_byte_order (arch);
ULONGEST bits_collected = 0;
unsigned int addr_size_bits = 8 * addr_size;
- int bits_big_endian = gdbarch_bits_big_endian (arch);
+ bool bits_big_endian = byte_order == BFD_ENDIAN_BIG;
- offsets = xmalloc ((op_end - op_ptr) * sizeof (int));
- cleanups = make_cleanup (xfree, offsets);
-
- for (i = 0; i < op_end - op_ptr; ++i)
- offsets[i] = -1;
-
- make_cleanup (VEC_cleanup (int), &dw_labels);
- make_cleanup (VEC_cleanup (int), &patches);
+ std::vector<int> offsets (op_end - op_ptr, -1);
/* By default we are making an address. */
loc->kind = axs_lvalue_memory;
while (op_ptr < op_end)
{
- enum dwarf_location_atom op = *op_ptr;
- unsigned long long uoffset, reg;
- long long offset;
+ enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr;
+ uint64_t uoffset, reg;
+ int64_t offset;
int i;
offsets[op_ptr - base] = expr->len;
case DW_OP_reg30:
case DW_OP_reg31:
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx");
- loc->u.reg = translate_register (arch, op - DW_OP_reg0);
+ loc->u.reg = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_reg0);
loc->kind = axs_lvalue_register;
break;
case DW_OP_regx:
op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx");
- loc->u.reg = translate_register (arch, reg);
+ loc->u.reg = dwarf_reg_to_regnum_or_error (arch, reg);
loc->kind = axs_lvalue_register;
break;
case DW_OP_implicit_value:
{
- unsigned long long len;
+ uint64_t len;
op_ptr = safe_read_uleb128 (op_ptr, op_end, &len);
if (op_ptr + len > op_end)
case DW_OP_breg30:
case DW_OP_breg31:
op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
- i = translate_register (arch, op - DW_OP_breg0);
+ i = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_breg0);
ax_reg (expr, i);
if (offset != 0)
{
{
op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
- i = translate_register (arch, reg);
+ i = dwarf_reg_to_regnum_or_error (arch, reg);
ax_reg (expr, i);
if (offset != 0)
{
{
const gdb_byte *datastart;
size_t datalen;
- struct block *b;
+ const struct block *b;
struct symbol *framefunc;
- LONGEST base_offset = 0;
b = block_for_pc (expr->scope);
if (!framefunc)
error (_("No function found for block"));
- dwarf_expr_frame_base_1 (framefunc, expr->scope,
- &datastart, &datalen);
+ func_get_frame_base_dwarf_block (framefunc, expr->scope,
+ &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);
if (offset != 0)
{
else
size = addr_size;
- switch (size)
- {
- case 8:
- ax_simple (expr, aop_ref8);
- break;
- case 16:
- ax_simple (expr, aop_ref16);
- break;
- case 32:
- ax_simple (expr, aop_ref32);
- break;
- case 64:
- ax_simple (expr, aop_ref64);
- break;
- default:
- /* Note that get_DW_OP_name will never return
- NULL here. */
- error (_("Unsupported size %d in %s"),
- size, get_DW_OP_name (op));
- }
+ if (size != 1 && size != 2 && size != 4 && size != 8)
+ error (_("Unsupported size %d in %s"),
+ size, get_DW_OP_name (op));
+ access_memory (arch, expr, size * TARGET_CHAR_BIT);
}
break;
break;
case DW_OP_call_frame_cfa:
- dwarf2_compile_cfa_to_ax (expr, loc, arch, expr->scope, per_cu);
- loc->kind = axs_lvalue_memory;
+ {
+ int regnum;
+ CORE_ADDR text_offset;
+ LONGEST off;
+ const gdb_byte *cfa_start, *cfa_end;
+
+ if (dwarf2_fetch_cfa_info (arch, expr->scope, per_cu,
+ ®num, &off,
+ &text_offset, &cfa_start, &cfa_end))
+ {
+ /* Register. */
+ ax_reg (expr, regnum);
+ if (off != 0)
+ {
+ ax_const_l (expr, off);
+ ax_simple (expr, aop_add);
+ }
+ }
+ else
+ {
+ /* Another expression. */
+ ax_const_l (expr, text_offset);
+ dwarf2_compile_expr_to_ax (expr, loc, addr_size, cfa_start,
+ cfa_end, per_cu);
+ }
+
+ loc->kind = axs_lvalue_memory;
+ }
break;
case DW_OP_GNU_push_tls_address:
+ case DW_OP_form_tls_address:
+ unimplemented (op);
+ break;
+
+ case DW_OP_push_object_address:
unimplemented (op);
break;
offset = extract_signed_integer (op_ptr, 2, byte_order);
op_ptr += 2;
i = ax_goto (expr, aop_goto);
- VEC_safe_push (int, dw_labels, op_ptr + offset - base);
- VEC_safe_push (int, patches, i);
+ dw_labels.push_back (op_ptr + offset - base);
+ patches.push_back (i);
break;
case DW_OP_bra:
/* Zero extend the operand. */
ax_zero_ext (expr, addr_size_bits);
i = ax_goto (expr, aop_if_goto);
- VEC_safe_push (int, dw_labels, op_ptr + offset - base);
- VEC_safe_push (int, patches, i);
+ dw_labels.push_back (op_ptr + offset - base);
+ patches.push_back (i);
break;
case DW_OP_nop:
case DW_OP_piece:
case DW_OP_bit_piece:
{
- unsigned long long size, offset;
+ uint64_t size;
if (op_ptr - 1 == previous_piece)
error (_("Cannot translate empty pieces to agent expressions"));
if (op == DW_OP_piece)
{
size *= 8;
- offset = 0;
+ uoffset = 0;
}
else
- op_ptr = safe_read_uleb128 (op_ptr, op_end, &offset);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
if (bits_collected + size > 8 * sizeof (LONGEST))
error (_("Expression pieces exceed word size"));
case axs_lvalue_memory:
/* Offset the pointer, if needed. */
- if (offset > 8)
+ if (uoffset > 8)
{
- ax_const_l (expr, offset / 8);
+ ax_const_l (expr, uoffset / 8);
ax_simple (expr, aop_add);
- offset %= 8;
+ uoffset %= 8;
}
access_memory (arch, expr, size);
break;
{
struct dwarf2_locexpr_baton block;
int size = (op == DW_OP_call2 ? 2 : 4);
- cu_offset offset;
uoffset = extract_unsigned_integer (op_ptr, size, byte_order);
op_ptr += size;
- offset.cu_off = uoffset;
- block = dwarf2_fetch_die_location_block (offset, per_cu,
- get_ax_pc, expr);
+ cu_offset cuoffset = (cu_offset) uoffset;
+ block = dwarf2_fetch_die_loc_cu_off (cuoffset, per_cu,
+ get_ax_pc, expr);
/* 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);
}
}
/* Patch all the branches we emitted. */
- for (i = 0; i < VEC_length (int, patches); ++i)
+ for (int i = 0; i < patches.size (); ++i)
{
- int targ = offsets[VEC_index (int, dw_labels, i)];
+ int targ = offsets[dw_labels[i]];
if (targ == -1)
internal_error (__FILE__, __LINE__, _("invalid label"));
- ax_label (expr, VEC_index (int, patches, i), targ);
+ ax_label (expr, patches[i], targ);
}
-
- do_cleanups (cleanups);
}
\f
static struct value *
locexpr_read_variable (struct symbol *symbol, struct frame_info *frame)
{
- struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_locexpr_baton *dlbaton
+ = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol);
struct value *val;
val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data,
static struct value *
locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame)
{
- struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_locexpr_baton *dlbaton
+ = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol);
return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, dlbaton->data,
dlbaton->size);
}
-/* Return non-zero iff we need a frame to evaluate SYMBOL. */
-static int
-locexpr_read_needs_frame (struct symbol *symbol)
+/* Implementation of get_symbol_read_needs from
+ symbol_computed_ops. */
+
+static enum symbol_needs_kind
+locexpr_get_symbol_read_needs (struct symbol *symbol)
{
- struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_locexpr_baton *dlbaton
+ = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol);
- return dwarf2_loc_desc_needs_frame (dlbaton->data, dlbaton->size,
- dlbaton->per_cu);
+ return dwarf2_loc_desc_get_symbol_read_needs (dlbaton->data, dlbaton->size,
+ dlbaton->per_cu);
}
/* Return true if DATA points to the end of a piece. END is one past
{
int regnum;
- regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_regnum);
+ /* This doesn't use dwarf_reg_to_regnum_or_error on purpose.
+ We'd rather print *something* here than throw an error. */
+ regnum = dwarf_reg_to_regnum (gdbarch, dwarf_regnum);
+ /* gdbarch_register_name may just return "", return something more
+ descriptive for bad register numbers. */
+ if (regnum == -1)
+ {
+ /* The text is output as "$bad_register_number".
+ That is why we use the underscores. */
+ return _("bad_register_number");
+ }
return gdbarch_register_name (gdbarch, regnum);
}
static const gdb_byte *
locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream,
CORE_ADDR addr, struct objfile *objfile,
+ struct dwarf2_per_cu_data *per_cu,
const gdb_byte *data, const gdb_byte *end,
unsigned int addr_size)
{
struct gdbarch *gdbarch = get_objfile_arch (objfile);
+ size_t leb128_size;
if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31)
{
}
else if (data[0] == DW_OP_regx)
{
- unsigned long long reg;
+ uint64_t reg;
data = safe_read_uleb128 (data + 1, end, ®);
fprintf_filtered (stream, _("a variable in $%s"),
}
else if (data[0] == DW_OP_fbreg)
{
- struct block *b;
+ const struct block *b;
struct symbol *framefunc;
int frame_reg = 0;
- long long frame_offset;
+ int64_t frame_offset;
const gdb_byte *base_data, *new_data, *save_data = data;
size_t base_size;
- long long base_offset = 0;
+ int64_t base_offset = 0;
new_data = safe_read_sleb128 (data + 1, end, &frame_offset);
if (!piece_end_p (new_data, end))
if (!b)
error (_("No block found for address for symbol \"%s\"."),
- SYMBOL_PRINT_NAME (symbol));
+ symbol->print_name ());
framefunc = block_linkage_function (b);
if (!framefunc)
error (_("No function found for block for symbol \"%s\"."),
- SYMBOL_PRINT_NAME (symbol));
+ symbol->print_name ());
- dwarf_expr_frame_base_1 (framefunc, addr, &base_data, &base_size);
+ func_get_frame_base_dwarf_block (framefunc, addr, &base_data, &base_size);
if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31)
{
if (buf_end != base_data + base_size)
error (_("Unexpected opcode after "
"DW_OP_breg%u for symbol \"%s\"."),
- frame_reg, SYMBOL_PRINT_NAME (symbol));
+ frame_reg, symbol->print_name ());
}
else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31)
{
else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31
&& piece_end_p (data, end))
{
- long long offset;
+ int64_t offset;
data = safe_read_sleb128 (data + 1, end, &offset);
&& (data[0] == DW_OP_addr
|| (addr_size == 4 && data[0] == DW_OP_const4u)
|| (addr_size == 8 && data[0] == DW_OP_const8u))
- && data[1 + addr_size] == DW_OP_GNU_push_tls_address
+ && (data[1 + addr_size] == DW_OP_GNU_push_tls_address
+ || data[1 + addr_size] == DW_OP_form_tls_address)
&& piece_end_p (data + 2 + addr_size, end))
{
ULONGEST offset;
fprintf_filtered (stream,
_("a thread-local variable at offset 0x%s "
"in the thread-local storage for `%s'"),
- phex_nz (offset, addr_size), objfile->name);
+ phex_nz (offset, addr_size), objfile_name (objfile));
data += 1 + addr_size + 1;
}
+
+ /* With -gsplit-dwarf a TLS variable can also look like this:
+ DW_AT_location : 3 byte block: fc 4 e0
+ (DW_OP_GNU_const_index: 4;
+ DW_OP_GNU_push_tls_address) */
+ else if (data + 3 <= end
+ && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end
+ && data[0] == DW_OP_GNU_const_index
+ && leb128_size > 0
+ && (data[1 + leb128_size] == DW_OP_GNU_push_tls_address
+ || data[1 + leb128_size] == DW_OP_form_tls_address)
+ && piece_end_p (data + 2 + leb128_size, end))
+ {
+ uint64_t offset;
+
+ data = safe_read_uleb128 (data + 1, end, &offset);
+ offset = dwarf2_read_addr_index (per_cu, offset);
+ fprintf_filtered (stream,
+ _("a thread-local variable at offset 0x%s "
+ "in the thread-local storage for `%s'"),
+ phex_nz (offset, addr_size), objfile_name (objfile));
+ ++data;
+ }
+
else if (data[0] >= DW_OP_lit0
&& data[0] <= DW_OP_lit31
&& data + 1 < end
&& (all
|| (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece)))
{
- enum dwarf_location_atom op = *data++;
- unsigned long long ul;
- long long l;
+ enum dwarf_location_atom op = (enum dwarf_location_atom) *data++;
+ uint64_t ul;
+ int64_t l;
const char *name;
name = get_DW_OP_name (op);
case DW_OP_bit_piece:
{
- unsigned long long offset;
+ uint64_t offset;
data = safe_read_uleb128 (data, end, &ul);
data = safe_read_uleb128 (data, end, &offset);
}
break;
+ case DW_OP_implicit_pointer:
case DW_OP_GNU_implicit_pointer:
{
ul = extract_unsigned_integer (data, offset_size,
}
break;
+ case DW_OP_deref_type:
case DW_OP_GNU_deref_type:
{
- int addr_size = *data++;
- cu_offset offset;
+ int deref_addr_size = *data++;
struct type *type;
data = safe_read_uleb128 (data, end, &ul);
- offset.cu_off = ul;
+ cu_offset offset = (cu_offset) ul;
type = dwarf2_get_die_type (offset, per_cu);
fprintf_filtered (stream, "<");
type_print (type, "", stream, -1);
- fprintf_filtered (stream, " [0x%s]> %d", phex_nz (offset.cu_off, 0),
- addr_size);
+ fprintf_filtered (stream, " [0x%s]> %d",
+ phex_nz (to_underlying (offset), 0),
+ deref_addr_size);
}
break;
+ case DW_OP_const_type:
case DW_OP_GNU_const_type:
{
- cu_offset type_die;
struct type *type;
data = safe_read_uleb128 (data, end, &ul);
- type_die.cu_off = ul;
+ cu_offset type_die = (cu_offset) ul;
type = dwarf2_get_die_type (type_die, per_cu);
fprintf_filtered (stream, "<");
type_print (type, "", stream, -1);
- fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0));
+ fprintf_filtered (stream, " [0x%s]>",
+ phex_nz (to_underlying (type_die), 0));
}
break;
+ case DW_OP_regval_type:
case DW_OP_GNU_regval_type:
{
- unsigned long long reg;
- cu_offset type_die;
+ uint64_t reg;
struct type *type;
data = safe_read_uleb128 (data, end, ®);
data = safe_read_uleb128 (data, end, &ul);
- type_die.cu_off = ul;
+ cu_offset type_die = (cu_offset) ul;
type = dwarf2_get_die_type (type_die, per_cu);
fprintf_filtered (stream, "<");
type_print (type, "", stream, -1);
fprintf_filtered (stream, " [0x%s]> [$%s]",
- phex_nz (type_die.cu_off, 0),
+ phex_nz (to_underlying (type_die), 0),
locexpr_regname (arch, reg));
}
break;
+ case DW_OP_convert:
case DW_OP_GNU_convert:
+ case DW_OP_reinterpret:
case DW_OP_GNU_reinterpret:
{
- cu_offset type_die;
-
data = safe_read_uleb128 (data, end, &ul);
- type_die.cu_off = ul;
+ cu_offset type_die = (cu_offset) ul;
- if (type_die.cu_off == 0)
+ if (to_underlying (type_die) == 0)
fprintf_filtered (stream, "<0>");
else
{
type = dwarf2_get_die_type (type_die, per_cu);
fprintf_filtered (stream, "<");
type_print (type, "", stream, -1);
- fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0));
+ fprintf_filtered (stream, " [0x%s]>",
+ phex_nz (to_underlying (type_die), 0));
}
}
break;
+ case DW_OP_entry_value:
case DW_OP_GNU_entry_value:
data = safe_read_uleb128 (data, end, &ul);
fputc_filtered ('\n', stream);
all, per_cu);
data += ul;
continue;
+
+ case DW_OP_GNU_parameter_ref:
+ ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch));
+ data += 4;
+ fprintf_filtered (stream, " offset %s", phex_nz (ul, 4));
+ break;
+
+ case DW_OP_addrx:
+ case DW_OP_GNU_addr_index:
+ data = safe_read_uleb128 (data, end, &ul);
+ ul = dwarf2_read_addr_index (per_cu, ul);
+ fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size));
+ break;
+ case DW_OP_GNU_const_index:
+ data = safe_read_uleb128 (data, end, &ul);
+ 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");
static void
locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr,
struct ui_file *stream,
- const gdb_byte *data, int size,
+ const gdb_byte *data, size_t size,
struct objfile *objfile, unsigned int addr_size,
int offset_size, struct dwarf2_per_cu_data *per_cu)
{
else
fprintf_filtered (stream, _(", and "));
- if (!dwarf2_always_disassemble)
+ if (!dwarf_always_disassemble)
{
data = locexpr_describe_location_piece (symbol, stream,
- addr, objfile,
+ addr, objfile, per_cu,
data, end, addr_size);
/* If we printed anything, or if we have an empty piece,
then don't disassemble. */
get_objfile_arch (objfile),
addr_size, offset_size, data,
data, end, 0,
- dwarf2_always_disassemble,
+ dwarf_always_disassemble,
per_cu);
}
fprintf_filtered (stream, " ");
if (data[0] == DW_OP_piece)
{
- unsigned long long bytes;
+ uint64_t bytes;
data = safe_read_uleb128 (data + 1, end, &bytes);
}
else if (data[0] == DW_OP_bit_piece)
{
- unsigned long long bits, offset;
+ uint64_t bits, offset;
data = safe_read_uleb128 (data + 1, end, &bits);
data = safe_read_uleb128 (data, end, &offset);
if (bad || data > end)
error (_("Corrupted DWARF2 expression for \"%s\"."),
- SYMBOL_PRINT_NAME (symbol));
+ symbol->print_name ());
}
/* Print a natural-language description of SYMBOL to STREAM. This
locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr,
struct ui_file *stream)
{
- struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_locexpr_baton *dlbaton
+ = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol);
struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu);
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 = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_locexpr_baton *dlbaton
+ = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol);
unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
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,
+ struct gdbarch *gdbarch,
+ unsigned char *registers_used,
+ CORE_ADDR pc, const char *result_name)
+{
+ struct dwarf2_locexpr_baton *dlbaton
+ = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (sym);
+ unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
+
+ if (dlbaton->size == 0)
+ error (_("symbol \"%s\" is optimized out"), sym->natural_name ());
+
+ compile_dwarf_expr_to_c (stream, result_name,
+ sym, pc, gdbarch, registers_used, addr_size,
+ dlbaton->data, dlbaton->data + dlbaton->size,
+ dlbaton->per_cu);
}
/* The set of location functions used with the DWARF-2 expression
const struct symbol_computed_ops dwarf2_locexpr_funcs = {
locexpr_read_variable,
locexpr_read_variable_at_entry,
- locexpr_read_needs_frame,
+ locexpr_get_symbol_read_needs,
locexpr_describe_location,
- locexpr_tracepoint_var_ref
+ 0, /* location_has_loclist */
+ locexpr_tracepoint_var_ref,
+ locexpr_generate_c_location
};
static struct value *
loclist_read_variable (struct symbol *symbol, struct frame_info *frame)
{
- struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_loclist_baton *dlbaton
+ = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol);
struct value *val;
const gdb_byte *data;
size_t size;
static struct value *
loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame)
{
- struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_loclist_baton *dlbaton
+ = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol);
const gdb_byte *data;
size_t size;
CORE_ADDR pc;
return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, data, size);
}
-/* Return non-zero iff we need a frame to evaluate SYMBOL. */
-static int
-loclist_read_needs_frame (struct symbol *symbol)
+/* Implementation of get_symbol_read_needs from
+ symbol_computed_ops. */
+
+static enum symbol_needs_kind
+loclist_symbol_needs (struct symbol *symbol)
{
/* If there's a location list, then assume we need to have a frame
to choose the appropriate location expression. With tracking of
is disabled in GCC at the moment until we figure out how to
represent it. */
- return 1;
+ return SYMBOL_NEEDS_FRAME;
}
/* Print a natural-language description of SYMBOL to STREAM. This
loclist_describe_location (struct symbol *symbol, CORE_ADDR addr,
struct ui_file *stream)
{
- struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_loclist_baton *dlbaton
+ = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol);
const gdb_byte *loc_ptr, *buf_end;
- int first = 1;
struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
struct gdbarch *gdbarch = get_objfile_arch (objfile);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
if (dlbaton->from_dwo)
kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu,
loc_ptr, buf_end, &new_ptr,
- &low, &high);
+ &low, &high, byte_order);
else
kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr,
&low, &high,
fprintf_filtered (stream, _(" Base address %s"),
paddress (gdbarch, base_address));
continue;
- case DEBUG_LOC_NORMAL:
+ case DEBUG_LOC_START_END:
+ case DEBUG_LOC_START_LENGTH:
break;
case DEBUG_LOC_BUFFER_OVERFLOW:
case DEBUG_LOC_INVALID_ENTRY:
error (_("Corrupted DWARF expression for symbol \"%s\"."),
- SYMBOL_PRINT_NAME (symbol));
+ symbol->print_name ());
default:
gdb_assert_not_reached ("bad debug_loc_kind");
}
low += base_address;
high += base_address;
+ low = gdbarch_adjust_dwarf2_addr (gdbarch, low);
+ high = gdbarch_adjust_dwarf2_addr (gdbarch, high);
+
length = extract_unsigned_integer (loc_ptr, 2, byte_order);
loc_ptr += 2;
/* 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 = SYMBOL_LOCATION_BATON (symbol);
+ struct dwarf2_loclist_baton *dlbaton
+ = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol);
const gdb_byte *data;
size_t size;
unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
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,
+ struct gdbarch *gdbarch,
+ unsigned char *registers_used,
+ CORE_ADDR pc, const char *result_name)
+{
+ struct dwarf2_loclist_baton *dlbaton
+ = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (sym);
+ unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
+ const gdb_byte *data;
+ size_t size;
+
+ data = dwarf2_find_location_expression (dlbaton, &size, pc);
+ if (size == 0)
+ error (_("symbol \"%s\" is optimized out"), sym->natural_name ());
+
+ compile_dwarf_expr_to_c (stream, result_name,
+ sym, pc, gdbarch, registers_used, addr_size,
+ data, data + size,
+ dlbaton->per_cu);
+}
+
/* The set of location functions used with the DWARF-2 expression
evaluator and location lists. */
const struct symbol_computed_ops dwarf2_loclist_funcs = {
loclist_read_variable,
loclist_read_variable_at_entry,
- loclist_read_needs_frame,
+ loclist_symbol_needs,
loclist_describe_location,
- loclist_tracepoint_var_ref
+ 1, /* location_has_loclist */
+ loclist_tracepoint_var_ref,
+ loclist_generate_c_location
};
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern initialize_file_ftype _initialize_dwarf2loc;
-
void
_initialize_dwarf2loc (void)
{
- add_setshow_zinteger_cmd ("entry-values", class_maintenance,
- &entry_values_debug,
- _("Set entry values and tail call frames "
- "debugging."),
- _("Show entry values and tail call frames "
- "debugging."),
- _("When non-zero, the process of determining "
- "parameter values from function entry point "
- "and tail call frames will be printed."),
- NULL,
- show_entry_values_debug,
- &setdebuglist, &showdebuglist);
+ add_setshow_zuinteger_cmd ("entry-values", class_maintenance,
+ &entry_values_debug,
+ _("Set entry values and tail call frames "
+ "debugging."),
+ _("Show entry values and tail call frames "
+ "debugging."),
+ _("When non-zero, the process of determining "
+ "parameter values from function entry point "
+ "and tail call frames will be printed."),
+ NULL,
+ show_entry_values_debug,
+ &setdebuglist, &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff