/* DWARF 2 location expression support for GDB.
- Copyright (C) 2003, 2005, 2007, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by Daniel Jacobowitz, MontaVista Software, Inc.
#include "regcache.h"
#include "objfiles.h"
#include "exceptions.h"
+#include "block.h"
-#include "elf/dwarf2.h"
+#include "dwarf2.h"
#include "dwarf2expr.h"
#include "dwarf2loc.h"
+#include "dwarf2-frame.h"
#include "gdb_string.h"
#include "gdb_assert.h"
int length;
struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu);
struct gdbarch *gdbarch = get_objfile_arch (objfile);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu);
CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
/* Adjust base_address for relocatable objects. */
while (1)
{
- low = dwarf2_read_address (gdbarch, loc_ptr, buf_end, addr_size);
- loc_ptr += addr_size;
- high = dwarf2_read_address (gdbarch, loc_ptr, buf_end, addr_size);
- loc_ptr += addr_size;
+ if (buf_end - loc_ptr < 2 * addr_size)
+ error (_("find_location_expression: Corrupted DWARF expression."));
- /* An end-of-list entry. */
- if (low == 0 && high == 0)
- return NULL;
+ low = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
+ loc_ptr += addr_size;
/* A base-address-selection entry. */
- if ((low & base_mask) == base_mask)
+ if (low == base_mask)
{
- base_address = high;
+ base_address = dwarf2_read_address (gdbarch,
+ loc_ptr, buf_end, addr_size);
+ loc_ptr += addr_size;
continue;
}
+ high = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
+ loc_ptr += addr_size;
+
+ /* An end-of-list entry. */
+ if (low == 0 && high == 0)
+ return NULL;
+
/* Otherwise, a location expression entry. */
low += base_address;
high += base_address;
- length = extract_unsigned_integer (loc_ptr, 2);
+ length = extract_unsigned_integer (loc_ptr, 2, byte_order);
loc_ptr += 2;
if (pc >= low && pc < high)
struct symbol *framefunc;
struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
- framefunc = get_frame_function (debaton->frame);
+ /* 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));
/* 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);
- if (SYMBOL_OPS (framefunc) == &dwarf2_loclist_funcs)
+ if (SYMBOL_LOCATION_BATON (framefunc) == NULL)
+ *start = NULL;
+ else if (SYMBOL_COMPUTED_OPS (framefunc) == &dwarf2_loclist_funcs)
{
struct dwarf2_loclist_baton *symbaton;
struct frame_info *frame = debaton->frame;
SYMBOL_NATURAL_NAME (framefunc));
}
+/* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for
+ the frame in BATON. */
+
+static CORE_ADDR
+dwarf_expr_frame_cfa (void *baton)
+{
+ struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
+ return dwarf2_frame_cfa (debaton->frame);
+}
+
/* Using the objfile specified in BATON, find the address for the
current thread's thread-local storage with offset OFFSET. */
static CORE_ADDR
return target_translate_tls_address (debaton->objfile, offset);
}
+struct piece_closure
+{
+ /* The number of pieces used to describe this variable. */
+ int n_pieces;
+
+ /* The architecture, used only for DWARF_VALUE_STACK. */
+ struct gdbarch *arch;
+
+ /* The pieces themselves. */
+ struct dwarf_expr_piece *pieces;
+};
+
+/* Allocate a closure for a value formed from separately-described
+ PIECES. */
+
+static struct piece_closure *
+allocate_piece_closure (int n_pieces, struct dwarf_expr_piece *pieces,
+ struct gdbarch *arch)
+{
+ struct piece_closure *c = XZALLOC (struct piece_closure);
+
+ c->n_pieces = n_pieces;
+ c->arch = arch;
+ c->pieces = XCALLOC (n_pieces, struct dwarf_expr_piece);
+
+ memcpy (c->pieces, pieces, n_pieces * sizeof (struct dwarf_expr_piece));
+
+ return c;
+}
+
+static void
+read_pieced_value (struct value *v)
+{
+ int i;
+ long offset = 0;
+ 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));
+
+ contents = value_contents_raw (v);
+ for (i = 0; i < c->n_pieces; i++)
+ {
+ struct dwarf_expr_piece *p = &c->pieces[i];
+ switch (p->location)
+ {
+ case DWARF_VALUE_REGISTER:
+ {
+ struct gdbarch *arch = get_frame_arch (frame);
+ bfd_byte regval[MAX_REGISTER_SIZE];
+ int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch,
+ p->v.expr.value);
+ get_frame_register (frame, gdb_regnum, regval);
+ memcpy (contents + offset, regval, p->size);
+ }
+ break;
+
+ case DWARF_VALUE_MEMORY:
+ if (p->v.expr.in_stack_memory)
+ read_stack (p->v.expr.value, contents + offset, p->size);
+ else
+ read_memory (p->v.expr.value, contents + offset, p->size);
+ break;
+
+ case DWARF_VALUE_STACK:
+ {
+ gdb_byte bytes[sizeof (ULONGEST)];
+ size_t n;
+ int addr_size = gdbarch_addr_bit (c->arch) / 8;
+ store_unsigned_integer (bytes, addr_size,
+ gdbarch_byte_order (c->arch),
+ p->v.expr.value);
+ n = p->size;
+ if (n > addr_size)
+ n = addr_size;
+ memcpy (contents + offset, bytes, n);
+ }
+ break;
+
+ case DWARF_VALUE_LITERAL:
+ {
+ size_t n = p->size;
+ if (n > p->v.literal.length)
+ n = p->v.literal.length;
+ memcpy (contents + offset, p->v.literal.data, n);
+ }
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid location type"));
+ }
+ offset += p->size;
+ }
+}
+
+static void
+write_pieced_value (struct value *to, struct value *from)
+{
+ int i;
+ long offset = 0;
+ 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));
+
+ if (frame == NULL)
+ {
+ set_value_optimized_out (to, 1);
+ return;
+ }
+
+ contents = value_contents_raw (from);
+ for (i = 0; i < c->n_pieces; i++)
+ {
+ struct dwarf_expr_piece *p = &c->pieces[i];
+ 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.expr.value);
+ put_frame_register (frame, gdb_regnum, contents + offset);
+ }
+ break;
+ case DWARF_VALUE_MEMORY:
+ write_memory (p->v.expr.value, contents + offset, p->size);
+ break;
+ default:
+ set_value_optimized_out (to, 1);
+ return;
+ }
+ offset += p->size;
+ }
+}
+
+static void *
+copy_pieced_value_closure (struct value *v)
+{
+ struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
+
+ return allocate_piece_closure (c->n_pieces, c->pieces, c->arch);
+}
+
+static void
+free_pieced_value_closure (struct value *v)
+{
+ struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
+
+ xfree (c->pieces);
+ xfree (c);
+}
+
+/* Functions for accessing a variable described by DW_OP_piece. */
+static struct lval_funcs pieced_value_funcs = {
+ read_pieced_value,
+ write_pieced_value,
+ copy_pieced_value_closure,
+ free_pieced_value_closure
+};
+
/* Evaluate a location description, starting at DATA and with length
SIZE, to find the current location of variable VAR in the context
of FRAME. */
gdb_byte *data, unsigned short size,
struct dwarf2_per_cu_data *per_cu)
{
- struct gdbarch *arch = get_frame_arch (frame);
struct value *retval;
struct dwarf_expr_baton baton;
struct dwarf_expr_context *ctx;
+ struct cleanup *old_chain;
if (size == 0)
{
baton.objfile = dwarf2_per_cu_objfile (per_cu);
ctx = new_dwarf_expr_context ();
+ old_chain = make_cleanup_free_dwarf_expr_context (ctx);
+
ctx->gdbarch = get_objfile_arch (baton.objfile);
ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
ctx->baton = &baton;
ctx->read_reg = dwarf_expr_read_reg;
ctx->read_mem = dwarf_expr_read_mem;
ctx->get_frame_base = dwarf_expr_frame_base;
+ ctx->get_frame_cfa = dwarf_expr_frame_cfa;
ctx->get_tls_address = dwarf_expr_tls_address;
dwarf_expr_eval (ctx, data, size);
if (ctx->num_pieces > 0)
{
- int i;
- long offset = 0;
- bfd_byte *contents;
-
- retval = allocate_value (SYMBOL_TYPE (var));
- contents = value_contents_raw (retval);
- for (i = 0; i < ctx->num_pieces; i++)
- {
- struct dwarf_expr_piece *p = &ctx->pieces[i];
- if (p->in_reg)
- {
- bfd_byte regval[MAX_REGISTER_SIZE];
- int gdb_regnum = gdbarch_dwarf2_reg_to_regnum
- (arch, p->value);
- get_frame_register (frame, gdb_regnum, regval);
- memcpy (contents + offset, regval, p->size);
- }
- else /* In memory? */
- {
- read_memory (p->value, contents + offset, p->size);
- }
- offset += p->size;
- }
- }
- else if (ctx->in_reg)
- {
- CORE_ADDR dwarf_regnum = dwarf_expr_fetch (ctx, 0);
- int gdb_regnum = gdbarch_dwarf2_reg_to_regnum
- (arch, dwarf_regnum);
- retval = value_from_register (SYMBOL_TYPE (var), gdb_regnum, frame);
+ struct piece_closure *c;
+ struct frame_id frame_id = get_frame_id (frame);
+
+ c = allocate_piece_closure (ctx->num_pieces, ctx->pieces, ctx->gdbarch);
+ retval = allocate_computed_value (SYMBOL_TYPE (var),
+ &pieced_value_funcs,
+ c);
+ VALUE_FRAME_ID (retval) = frame_id;
}
else
{
- CORE_ADDR address = dwarf_expr_fetch (ctx, 0);
-
- retval = allocate_value (SYMBOL_TYPE (var));
- VALUE_LVAL (retval) = lval_memory;
- set_value_lazy (retval, 1);
- VALUE_ADDRESS (retval) = address;
+ switch (ctx->location)
+ {
+ case DWARF_VALUE_REGISTER:
+ {
+ struct gdbarch *arch = get_frame_arch (frame);
+ CORE_ADDR dwarf_regnum = dwarf_expr_fetch (ctx, 0);
+ int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_regnum);
+ retval = value_from_register (SYMBOL_TYPE (var), gdb_regnum, frame);
+ }
+ break;
+
+ case DWARF_VALUE_MEMORY:
+ {
+ CORE_ADDR address = dwarf_expr_fetch (ctx, 0);
+ int in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0);
+
+ retval = allocate_value (SYMBOL_TYPE (var));
+ VALUE_LVAL (retval) = lval_memory;
+ set_value_lazy (retval, 1);
+ if (in_stack_memory)
+ set_value_stack (retval, 1);
+ set_value_address (retval, address);
+ }
+ break;
+
+ case DWARF_VALUE_STACK:
+ {
+ gdb_byte bytes[sizeof (ULONGEST)];
+ ULONGEST value = (ULONGEST) dwarf_expr_fetch (ctx, 0);
+ bfd_byte *contents;
+ size_t n = ctx->addr_size;
+
+ store_unsigned_integer (bytes, ctx->addr_size,
+ gdbarch_byte_order (ctx->gdbarch),
+ value);
+ retval = allocate_value (SYMBOL_TYPE (var));
+ contents = value_contents_raw (retval);
+ if (n > TYPE_LENGTH (SYMBOL_TYPE (var)))
+ n = TYPE_LENGTH (SYMBOL_TYPE (var));
+ memcpy (contents, bytes, n);
+ }
+ break;
+
+ case DWARF_VALUE_LITERAL:
+ {
+ bfd_byte *contents;
+ size_t n = ctx->len;
+
+ retval = allocate_value (SYMBOL_TYPE (var));
+ contents = value_contents_raw (retval);
+ if (n > TYPE_LENGTH (SYMBOL_TYPE (var)))
+ n = TYPE_LENGTH (SYMBOL_TYPE (var));
+ memcpy (contents, ctx->data, n);
+ }
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid location type"));
+ }
}
set_value_initialized (retval, ctx->initialized);
- free_dwarf_expr_context (ctx);
+ do_cleanups (old_chain);
return retval;
}
-
-
-
-
\f
/* Helper functions and baton for dwarf2_loc_desc_needs_frame. */
nf_baton->needs_frame = 1;
}
+/* CFA accesses require a frame. */
+
+static CORE_ADDR
+needs_frame_frame_cfa (void *baton)
+{
+ struct needs_frame_baton *nf_baton = baton;
+ nf_baton->needs_frame = 1;
+ return 1;
+}
+
/* Thread-local accesses do require a frame. */
static CORE_ADDR
needs_frame_tls_address (void *baton, CORE_ADDR offset)
struct needs_frame_baton baton;
struct dwarf_expr_context *ctx;
int in_reg;
+ struct cleanup *old_chain;
baton.needs_frame = 0;
ctx = new_dwarf_expr_context ();
+ old_chain = make_cleanup_free_dwarf_expr_context (ctx);
+
ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (per_cu));
ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
ctx->baton = &baton;
ctx->read_reg = needs_frame_read_reg;
ctx->read_mem = needs_frame_read_mem;
ctx->get_frame_base = needs_frame_frame_base;
+ ctx->get_frame_cfa = needs_frame_frame_cfa;
ctx->get_tls_address = needs_frame_tls_address;
dwarf_expr_eval (ctx, data, size);
- in_reg = ctx->in_reg;
+ in_reg = ctx->location == DWARF_VALUE_REGISTER;
if (ctx->num_pieces > 0)
{
/* 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].in_reg)
+ if (ctx->pieces[i].location == DWARF_VALUE_REGISTER)
in_reg = 1;
}
- free_dwarf_expr_context (ctx);
+ do_cleanups (old_chain);
return baton.needs_frame || in_reg;
}
static void
-dwarf2_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax,
- struct axs_value *value, gdb_byte *data,
- int size)
+dwarf2_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
+ struct agent_expr *ax, struct axs_value *value,
+ gdb_byte *data, int size)
{
if (size == 0)
error (_("Symbol \"%s\" has been optimized out."),
error (_("Unexpected opcode after DW_OP_fbreg for symbol \"%s\"."),
SYMBOL_PRINT_NAME (symbol));
- gdbarch_virtual_frame_pointer (current_gdbarch,
+ gdbarch_virtual_frame_pointer (gdbarch,
ax->scope, &frame_reg, &frame_offset);
ax_reg (ax, frame_reg);
ax_const_l (ax, frame_offset);
fprintf_filtered (stream,
"a thread-local variable at offset %s in the "
"thread-local storage for `%s'",
- paddr_nz (offset), objfile->name);
+ paddress (gdbarch, offset), objfile->name);
return 1;
}
against. When there is one this function should be revisited. */
static void
-locexpr_tracepoint_var_ref (struct symbol * symbol, struct agent_expr * ax,
- struct axs_value * value)
+locexpr_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
+ struct agent_expr *ax, struct axs_value *value)
{
struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
- dwarf2_tracepoint_var_ref (symbol, ax, value, dlbaton->data, dlbaton->size);
+ dwarf2_tracepoint_var_ref (symbol, gdbarch, ax, value,
+ dlbaton->data, dlbaton->size);
}
/* The set of location functions used with the DWARF-2 expression
evaluator. */
-const struct symbol_ops dwarf2_locexpr_funcs = {
+const struct symbol_computed_ops dwarf2_locexpr_funcs = {
locexpr_read_variable,
locexpr_read_needs_frame,
locexpr_describe_location,
/* 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 agent_expr * ax,
- struct axs_value * value)
+loclist_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
+ struct agent_expr *ax, struct axs_value *value)
{
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
gdb_byte *data;
if (data == NULL)
error (_("Variable \"%s\" is not available."), SYMBOL_NATURAL_NAME (symbol));
- dwarf2_tracepoint_var_ref (symbol, ax, value, data, size);
+ dwarf2_tracepoint_var_ref (symbol, gdbarch, ax, value, data, size);
}
/* The set of location functions used with the DWARF-2 expression
evaluator and location lists. */
-const struct symbol_ops dwarf2_loclist_funcs = {
+const struct symbol_computed_ops dwarf2_loclist_funcs = {
loclist_read_variable,
loclist_read_needs_frame,
loclist_describe_location,
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