/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2003, 2005, 2007-2012 Free Software Foundation,
+ Inc.
Contributed by Daniel Berlin (dan@dberlin.org)
static void execute_stack_op (struct dwarf_expr_context *,
const gdb_byte *, const gdb_byte *);
+/* Cookie for gdbarch data. */
+
+static struct gdbarch_data *dwarf_arch_cookie;
+
+/* This holds gdbarch-specific types used by the DWARF expression
+ evaluator. See comments in execute_stack_op. */
+
+struct dwarf_gdbarch_types
+{
+ struct type *dw_types[3];
+};
+
+/* Allocate and fill in dwarf_gdbarch_types for an arch. */
+
+static void *
+dwarf_gdbarch_types_init (struct gdbarch *gdbarch)
+{
+ struct dwarf_gdbarch_types *types
+ = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct dwarf_gdbarch_types);
+
+ /* The types themselves are lazily initialized. */
+
+ return types;
+}
+
+/* Return the type used for DWARF operations where the type is
+ unspecified in the DWARF spec. Only certain sizes are
+ supported. */
+
+static struct type *
+dwarf_expr_address_type (struct dwarf_expr_context *ctx)
+{
+ struct dwarf_gdbarch_types *types = gdbarch_data (ctx->gdbarch,
+ dwarf_arch_cookie);
+ int ndx;
+
+ if (ctx->addr_size == 2)
+ ndx = 0;
+ else if (ctx->addr_size == 4)
+ ndx = 1;
+ else if (ctx->addr_size == 8)
+ ndx = 2;
+ else
+ error (_("Unsupported address size in DWARF expressions: %d bits"),
+ 8 * ctx->addr_size);
+
+ if (types->dw_types[ndx] == NULL)
+ types->dw_types[ndx]
+ = arch_integer_type (ctx->gdbarch,
+ 8 * ctx->addr_size,
+ 0, "<signed DWARF address type>");
+
+ return types->dw_types[ndx];
+}
+
/* Create a new context for the expression evaluator. */
struct dwarf_expr_context *
/* Push VALUE onto CTX's stack. */
-void
-dwarf_expr_push (struct dwarf_expr_context *ctx, ULONGEST value,
+static void
+dwarf_expr_push (struct dwarf_expr_context *ctx, struct value *value,
int in_stack_memory)
{
struct dwarf_stack_value *v;
- /* We keep all stack elements within the range defined by the
- DWARF address size. */
- if (ctx->addr_size < sizeof (ULONGEST))
- value &= ((ULONGEST) 1 << (ctx->addr_size * HOST_CHAR_BIT)) - 1;
-
dwarf_expr_grow_stack (ctx, 1);
v = &ctx->stack[ctx->stack_len++];
v->value = value;
v->in_stack_memory = in_stack_memory;
}
-/* Pop the top item off of CTX's stack. */
+/* Push VALUE onto CTX's stack. */
void
+dwarf_expr_push_address (struct dwarf_expr_context *ctx, CORE_ADDR value,
+ int in_stack_memory)
+{
+ dwarf_expr_push (ctx,
+ value_from_ulongest (dwarf_expr_address_type (ctx), value),
+ in_stack_memory);
+}
+
+/* Pop the top item off of CTX's stack. */
+
+static void
dwarf_expr_pop (struct dwarf_expr_context *ctx)
{
if (ctx->stack_len <= 0)
/* Retrieve the N'th item on CTX's stack. */
-ULONGEST
+struct value *
dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n)
{
if (ctx->stack_len <= n)
"stack only has %d elements on it."),
n, ctx->stack_len);
return ctx->stack[ctx->stack_len - (1 + n)].value;
+}
+/* Require that TYPE be an integral type; throw an exception if not. */
+
+static void
+dwarf_require_integral (struct type *type)
+{
+ if (TYPE_CODE (type) != TYPE_CODE_INT
+ && TYPE_CODE (type) != TYPE_CODE_CHAR
+ && TYPE_CODE (type) != TYPE_CODE_BOOL)
+ error (_("integral type expected in DWARF expression"));
+}
+
+/* Return the unsigned form of TYPE. TYPE is necessarily an integral
+ type. */
+
+static struct type *
+get_unsigned_type (struct gdbarch *gdbarch, struct type *type)
+{
+ switch (TYPE_LENGTH (type))
+ {
+ case 1:
+ return builtin_type (gdbarch)->builtin_uint8;
+ case 2:
+ return builtin_type (gdbarch)->builtin_uint16;
+ case 4:
+ return builtin_type (gdbarch)->builtin_uint32;
+ case 8:
+ return builtin_type (gdbarch)->builtin_uint64;
+ default:
+ error (_("no unsigned variant found for type, while evaluating "
+ "DWARF expression"));
+ }
+}
+
+/* Return the signed form of TYPE. TYPE is necessarily an integral
+ type. */
+
+static struct type *
+get_signed_type (struct gdbarch *gdbarch, struct type *type)
+{
+ switch (TYPE_LENGTH (type))
+ {
+ case 1:
+ return builtin_type (gdbarch)->builtin_int8;
+ case 2:
+ return builtin_type (gdbarch)->builtin_int16;
+ case 4:
+ return builtin_type (gdbarch)->builtin_int32;
+ case 8:
+ return builtin_type (gdbarch)->builtin_int64;
+ default:
+ error (_("no signed variant found for type, while evaluating "
+ "DWARF expression"));
+ }
}
/* Retrieve the N'th item on CTX's stack, converted to an address. */
CORE_ADDR
dwarf_expr_fetch_address (struct dwarf_expr_context *ctx, int n)
{
- ULONGEST result = dwarf_expr_fetch (ctx, n);
+ struct value *result_val = dwarf_expr_fetch (ctx, n);
+ enum bfd_endian byte_order = gdbarch_byte_order (ctx->gdbarch);
+ ULONGEST result;
+
+ dwarf_require_integral (value_type (result_val));
+ result = extract_unsigned_integer (value_contents (result_val),
+ TYPE_LENGTH (value_type (result_val)),
+ byte_order);
/* For most architectures, calling extract_unsigned_integer() alone
is sufficient for extracting an address. However, some
for those architectures which require it. */
if (gdbarch_integer_to_address_p (ctx->gdbarch))
{
- enum bfd_endian byte_order = gdbarch_byte_order (ctx->gdbarch);
gdb_byte *buf = alloca (ctx->addr_size);
- struct type *int_type;
-
- switch (ctx->addr_size)
- {
- case 2:
- int_type = builtin_type (ctx->gdbarch)->builtin_uint16;
- break;
- case 4:
- int_type = builtin_type (ctx->gdbarch)->builtin_uint32;
- break;
- case 8:
- int_type = builtin_type (ctx->gdbarch)->builtin_uint64;
- break;
- default:
- internal_error (__FILE__, __LINE__,
- _("Unsupported address size.\n"));
- }
+ struct type *int_type = get_unsigned_type (ctx->gdbarch,
+ value_type (result_val));
store_unsigned_integer (buf, ctx->addr_size, byte_order, result);
return gdbarch_integer_to_address (ctx->gdbarch, int_type, buf);
"stack only has %d elements on it."),
n, ctx->stack_len);
return ctx->stack[ctx->stack_len - (1 + n)].in_stack_memory;
-
}
/* Return true if the expression stack is empty. */
else if (p->location == DWARF_VALUE_IMPLICIT_POINTER)
{
p->v.ptr.die = ctx->len;
- p->v.ptr.offset = (LONGEST) dwarf_expr_fetch (ctx, 0);
+ p->v.ptr.offset = value_as_long (dwarf_expr_fetch (ctx, 0));
}
+ else if (p->location == DWARF_VALUE_REGISTER)
+ p->v.regno = value_as_long (dwarf_expr_fetch (ctx, 0));
else
{
p->v.value = dwarf_expr_fetch (ctx, 0);
/* Decode the unsigned LEB128 constant at BUF into the variable pointed to
by R, and return the new value of BUF. Verify that it doesn't extend
- past BUF_END. */
+ past BUF_END. R can be NULL, the constant is then only skipped. */
const gdb_byte *
read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end, ULONGEST * r)
error (_("read_uleb128: Corrupted DWARF expression."));
byte = *buf++;
- result |= (byte & 0x7f) << shift;
+ result |= ((ULONGEST) (byte & 0x7f)) << shift;
if ((byte & 0x80) == 0)
break;
shift += 7;
}
- *r = result;
+ if (r)
+ *r = result;
return buf;
}
/* Decode the signed LEB128 constant at BUF into the variable pointed to
by R, and return the new value of BUF. Verify that it doesn't extend
- past BUF_END. */
+ past BUF_END. R can be NULL, the constant is then only skipped. */
const gdb_byte *
read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end, LONGEST * r)
error (_("read_sleb128: Corrupted DWARF expression."));
byte = *buf++;
- result |= (byte & 0x7f) << shift;
+ result |= ((ULONGEST) (byte & 0x7f)) << shift;
shift += 7;
if ((byte & 0x80) == 0)
break;
}
if (shift < (sizeof (*r) * 8) && (byte & 0x40) != 0)
- result |= -(1 << shift);
+ result |= -(((LONGEST) 1) << shift);
- *r = result;
+ if (r)
+ *r = result;
return buf;
}
\f
checked at the other place that this function is called. */
if (op_ptr != op_end && *op_ptr != DW_OP_piece && *op_ptr != DW_OP_bit_piece)
error (_("DWARF-2 expression error: `%s' operations must be "
- "used either alone or in conjuction with DW_OP_piece "
+ "used either alone or in conjunction with DW_OP_piece "
"or DW_OP_bit_piece."),
op_name);
}
+/* Return true iff the types T1 and T2 are "the same". This only does
+ checks that might reasonably be needed to compare DWARF base
+ types. */
+
+static int
+base_types_equal_p (struct type *t1, struct type *t2)
+{
+ if (TYPE_CODE (t1) != TYPE_CODE (t2))
+ return 0;
+ if (TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2))
+ return 0;
+ return TYPE_LENGTH (t1) == TYPE_LENGTH (t2);
+}
+
+/* A convenience function to call get_base_type on CTX and return the
+ result. DIE is the DIE whose type we need. SIZE is non-zero if
+ this function should verify that the resulting type has the correct
+ size. */
+
+static struct type *
+dwarf_get_base_type (struct dwarf_expr_context *ctx, ULONGEST die, int size)
+{
+ struct type *result;
+
+ if (ctx->funcs->get_base_type)
+ {
+ result = ctx->funcs->get_base_type (ctx, die);
+ if (result == NULL)
+ error (_("Could not find type for DW_OP_GNU_const_type"));
+ if (size != 0 && TYPE_LENGTH (result) != size)
+ error (_("DW_OP_GNU_const_type has different sizes for type and data"));
+ }
+ else
+ /* Anything will do. */
+ result = builtin_type (ctx->gdbarch)->builtin_int;
+
+ return result;
+}
+
+/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_reg* return the
+ DWARF register number. Otherwise return -1. */
+
+int
+dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end)
+{
+ ULONGEST dwarf_reg;
+
+ if (buf_end <= buf)
+ return -1;
+ if (*buf >= DW_OP_reg0 && *buf <= DW_OP_reg31)
+ {
+ if (buf_end - buf != 1)
+ return -1;
+ return *buf - DW_OP_reg0;
+ }
+
+ if (*buf == DW_OP_GNU_regval_type)
+ {
+ buf++;
+ buf = read_uleb128 (buf, buf_end, &dwarf_reg);
+ buf = read_uleb128 (buf, buf_end, NULL);
+ }
+ else if (*buf == DW_OP_regx)
+ {
+ buf++;
+ buf = read_uleb128 (buf, buf_end, &dwarf_reg);
+ }
+ else
+ return -1;
+ if (buf != buf_end || (int) dwarf_reg != dwarf_reg)
+ return -1;
+ return dwarf_reg;
+}
+
+/* If <BUF..BUF_END] contains DW_FORM_block* with just DW_OP_breg*(0) and
+ DW_OP_deref* return the DWARF register number. Otherwise return -1.
+ DEREF_SIZE_RETURN contains -1 for DW_OP_deref; otherwise it contains the
+ size from DW_OP_deref_size. */
+
+int
+dwarf_block_to_dwarf_reg_deref (const gdb_byte *buf, const gdb_byte *buf_end,
+ CORE_ADDR *deref_size_return)
+{
+ ULONGEST dwarf_reg;
+ LONGEST offset;
+
+ if (buf_end <= buf)
+ return -1;
+ if (*buf >= DW_OP_breg0 && *buf <= DW_OP_breg31)
+ {
+ dwarf_reg = *buf - DW_OP_breg0;
+ buf++;
+ }
+ else if (*buf == DW_OP_bregx)
+ {
+ buf++;
+ buf = read_uleb128 (buf, buf_end, &dwarf_reg);
+ if ((int) dwarf_reg != dwarf_reg)
+ return -1;
+ }
+ else
+ return -1;
+
+ buf = read_sleb128 (buf, buf_end, &offset);
+ if (offset != 0)
+ return -1;
+
+ if (buf >= buf_end)
+ return -1;
+
+ if (*buf == DW_OP_deref)
+ {
+ buf++;
+ *deref_size_return = -1;
+ }
+ else if (*buf == DW_OP_deref_size)
+ {
+ buf++;
+ if (buf >= buf_end)
+ return -1;
+ *deref_size_return = *buf++;
+ }
+ else
+ return -1;
+
+ if (buf != buf_end)
+ return -1;
+
+ return dwarf_reg;
+}
+
+/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_fbreg(X) fill
+ in FB_OFFSET_RETURN with the X offset and return 1. Otherwise return 0. */
+
+int
+dwarf_block_to_fb_offset (const gdb_byte *buf, const gdb_byte *buf_end,
+ CORE_ADDR *fb_offset_return)
+{
+ LONGEST fb_offset;
+
+ if (buf_end <= buf)
+ return 0;
+
+ if (*buf != DW_OP_fbreg)
+ return 0;
+ buf++;
+
+ buf = read_sleb128 (buf, buf_end, &fb_offset);
+ *fb_offset_return = fb_offset;
+ if (buf != buf_end || fb_offset != (LONGEST) *fb_offset_return)
+ return 0;
+
+ return 1;
+}
+
+/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_bregSP(X) fill
+ in SP_OFFSET_RETURN with the X offset and return 1. Otherwise return 0.
+ The matched SP register number depends on GDBARCH. */
+
+int
+dwarf_block_to_sp_offset (struct gdbarch *gdbarch, const gdb_byte *buf,
+ const gdb_byte *buf_end, CORE_ADDR *sp_offset_return)
+{
+ ULONGEST dwarf_reg;
+ LONGEST sp_offset;
+
+ if (buf_end <= buf)
+ return 0;
+ if (*buf >= DW_OP_breg0 && *buf <= DW_OP_breg31)
+ {
+ dwarf_reg = *buf - DW_OP_breg0;
+ buf++;
+ }
+ else
+ {
+ if (*buf != DW_OP_bregx)
+ return 0;
+ buf++;
+ buf = read_uleb128 (buf, buf_end, &dwarf_reg);
+ }
+
+ if (gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_reg)
+ != gdbarch_sp_regnum (gdbarch))
+ return 0;
+
+ buf = read_sleb128 (buf, buf_end, &sp_offset);
+ *sp_offset_return = sp_offset;
+ if (buf != buf_end || sp_offset != (LONGEST) *sp_offset_return)
+ return 0;
+
+ return 1;
+}
+
/* The engine for the expression evaluator. Using the context in CTX,
evaluate the expression between OP_PTR and OP_END. */
execute_stack_op (struct dwarf_expr_context *ctx,
const gdb_byte *op_ptr, const gdb_byte *op_end)
{
-#define sign_ext(x) ((LONGEST) (((x) ^ sign_bit) - sign_bit))
- ULONGEST sign_bit = (ctx->addr_size >= sizeof (ULONGEST) ? 0
- : ((ULONGEST) 1) << (ctx->addr_size * 8 - 1));
enum bfd_endian byte_order = gdbarch_byte_order (ctx->gdbarch);
+ /* Old-style "untyped" DWARF values need special treatment in a
+ couple of places, specifically DW_OP_mod and DW_OP_shr. We need
+ a special type for these values so we can distinguish them from
+ values that have an explicit type, because explicitly-typed
+ values do not need special treatment. This special type must be
+ different (in the `==' sense) from any base type coming from the
+ CU. */
+ struct type *address_type = dwarf_expr_address_type (ctx);
ctx->location = DWARF_VALUE_MEMORY;
ctx->initialized = 1; /* Default is initialized. */
int in_stack_memory = 0;
ULONGEST uoffset, reg;
LONGEST offset;
+ struct value *result_val = NULL;
+
+ /* The DWARF expression might have a bug causing an infinite
+ loop. In that case, quitting is the only way out. */
+ QUIT;
switch (op)
{
case DW_OP_lit30:
case DW_OP_lit31:
result = op - DW_OP_lit0;
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_addr:
branching between the address and the TLS op. */
if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address)
result += ctx->offset;
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_const1u:
result = extract_unsigned_integer (op_ptr, 1, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 1;
break;
case DW_OP_const1s:
result = extract_signed_integer (op_ptr, 1, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 1;
break;
case DW_OP_const2u:
result = extract_unsigned_integer (op_ptr, 2, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 2;
break;
case DW_OP_const2s:
result = extract_signed_integer (op_ptr, 2, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 2;
break;
case DW_OP_const4u:
result = extract_unsigned_integer (op_ptr, 4, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 4;
break;
case DW_OP_const4s:
result = extract_signed_integer (op_ptr, 4, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 4;
break;
case DW_OP_const8u:
result = extract_unsigned_integer (op_ptr, 8, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 8;
break;
case DW_OP_const8s:
result = extract_signed_integer (op_ptr, 8, byte_order);
+ result_val = value_from_ulongest (address_type, result);
op_ptr += 8;
break;
case DW_OP_constu:
op_ptr = read_uleb128 (op_ptr, op_end, &uoffset);
result = uoffset;
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_consts:
op_ptr = read_sleb128 (op_ptr, op_end, &offset);
result = offset;
+ result_val = value_from_ulongest (address_type, result);
break;
/* The DW_OP_reg operations are required to occur alone in
&& *op_ptr != DW_OP_bit_piece
&& *op_ptr != DW_OP_GNU_uninit)
error (_("DWARF-2 expression error: DW_OP_reg operations must be "
- "used either alone or in conjuction with DW_OP_piece "
+ "used either alone or in conjunction with DW_OP_piece "
"or DW_OP_bit_piece."));
result = op - DW_OP_reg0;
+ result_val = value_from_ulongest (address_type, result);
ctx->location = DWARF_VALUE_REGISTER;
break;
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx");
result = reg;
+ result_val = value_from_ulongest (address_type, result);
ctx->location = DWARF_VALUE_REGISTER;
break;
ULONGEST die;
LONGEST len;
+ if (ctx->ref_addr_size == -1)
+ error (_("DWARF-2 expression error: DW_OP_GNU_implicit_pointer "
+ "is not allowed in frame context"));
+
/* The referred-to DIE. */
- ctx->len = extract_unsigned_integer (op_ptr, ctx->addr_size,
+ ctx->len = extract_unsigned_integer (op_ptr, ctx->ref_addr_size,
byte_order);
- op_ptr += ctx->addr_size;
+ op_ptr += ctx->ref_addr_size;
/* The byte offset into the data. */
op_ptr = read_sleb128 (op_ptr, op_end, &len);
result = (ULONGEST) len;
+ result_val = value_from_ulongest (address_type, result);
ctx->location = DWARF_VALUE_IMPLICIT_POINTER;
dwarf_expr_require_composition (op_ptr, op_end,
case DW_OP_breg31:
{
op_ptr = read_sleb128 (op_ptr, op_end, &offset);
- result = (ctx->read_reg) (ctx->baton, op - DW_OP_breg0);
+ result = (ctx->funcs->read_reg) (ctx->baton, op - DW_OP_breg0);
result += offset;
+ result_val = value_from_ulongest (address_type, result);
}
break;
case DW_OP_bregx:
{
op_ptr = read_uleb128 (op_ptr, op_end, ®);
op_ptr = read_sleb128 (op_ptr, op_end, &offset);
- result = (ctx->read_reg) (ctx->baton, reg);
+ result = (ctx->funcs->read_reg) (ctx->baton, reg);
result += offset;
+ result_val = value_from_ulongest (address_type, result);
}
break;
case DW_OP_fbreg:
/* FIXME: cagney/2003-03-26: This code should be using
get_frame_base_address(), and then implement a dwarf2
specific this_base method. */
- (ctx->get_frame_base) (ctx->baton, &datastart, &datalen);
+ (ctx->funcs->get_frame_base) (ctx->baton, &datastart, &datalen);
dwarf_expr_eval (ctx, datastart, datalen);
if (ctx->location == DWARF_VALUE_MEMORY)
result = dwarf_expr_fetch_address (ctx, 0);
else if (ctx->location == DWARF_VALUE_REGISTER)
- result = (ctx->read_reg) (ctx->baton, dwarf_expr_fetch (ctx, 0));
+ result = (ctx->funcs->read_reg) (ctx->baton,
+ value_as_long (dwarf_expr_fetch (ctx, 0)));
else
error (_("Not implemented: computing frame "
"base using explicit value operator"));
result = result + offset;
+ result_val = value_from_ulongest (address_type, result);
in_stack_memory = 1;
ctx->stack_len = before_stack_len;
ctx->location = DWARF_VALUE_MEMORY;
break;
case DW_OP_dup:
- result = dwarf_expr_fetch (ctx, 0);
+ result_val = dwarf_expr_fetch (ctx, 0);
in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0);
break;
case DW_OP_pick:
offset = *op_ptr++;
- result = dwarf_expr_fetch (ctx, offset);
+ result_val = dwarf_expr_fetch (ctx, offset);
in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, offset);
break;
if (ctx->stack_len < 2)
error (_("Not enough elements for "
- "DW_OP_swap. Need 2, have %d."),
+ "DW_OP_swap. Need 2, have %d."),
ctx->stack_len);
t1 = ctx->stack[ctx->stack_len - 1];
t2 = ctx->stack[ctx->stack_len - 2];
}
case DW_OP_over:
- result = dwarf_expr_fetch (ctx, 1);
+ result_val = dwarf_expr_fetch (ctx, 1);
in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 1);
break;
struct dwarf_stack_value t1, t2, t3;
if (ctx->stack_len < 3)
- error (_("Not enough elements for DW_OP_rot. Need 3, have %d."),
+ error (_("Not enough elements for "
+ "DW_OP_rot. Need 3, have %d."),
ctx->stack_len);
t1 = ctx->stack[ctx->stack_len - 1];
t2 = ctx->stack[ctx->stack_len - 2];
case DW_OP_deref:
case DW_OP_deref_size:
+ case DW_OP_GNU_deref_type:
{
int addr_size = (op == DW_OP_deref ? ctx->addr_size : *op_ptr++);
gdb_byte *buf = alloca (addr_size);
CORE_ADDR addr = dwarf_expr_fetch_address (ctx, 0);
+ struct type *type;
+
dwarf_expr_pop (ctx);
- (ctx->read_mem) (ctx->baton, buf, addr, addr_size);
- result = extract_unsigned_integer (buf, addr_size, byte_order);
+ if (op == DW_OP_GNU_deref_type)
+ {
+ ULONGEST type_die;
+
+ op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+ type = dwarf_get_base_type (ctx, type_die, 0);
+ }
+ else
+ type = address_type;
+
+ (ctx->funcs->read_mem) (ctx->baton, buf, addr, addr_size);
+
+ /* If the size of the object read from memory is different
+ from the type length, we need to zero-extend it. */
+ if (TYPE_LENGTH (type) != addr_size)
+ {
+ ULONGEST result =
+ extract_unsigned_integer (buf, addr_size, byte_order);
+
+ buf = alloca (TYPE_LENGTH (type));
+ store_unsigned_integer (buf, TYPE_LENGTH (type),
+ byte_order, result);
+ }
+
+ result_val = value_from_contents_and_address (type, buf, addr);
break;
}
case DW_OP_neg:
case DW_OP_not:
case DW_OP_plus_uconst:
- /* Unary operations. */
- result = dwarf_expr_fetch (ctx, 0);
- dwarf_expr_pop (ctx);
+ {
+ /* Unary operations. */
+ result_val = dwarf_expr_fetch (ctx, 0);
+ dwarf_expr_pop (ctx);
- switch (op)
- {
- case DW_OP_abs:
- if (sign_ext (result) < 0)
- result = -result;
- break;
- case DW_OP_neg:
- result = -result;
- break;
- case DW_OP_not:
- result = ~result;
- break;
- case DW_OP_plus_uconst:
- op_ptr = read_uleb128 (op_ptr, op_end, ®);
- result += reg;
- break;
- }
+ switch (op)
+ {
+ case DW_OP_abs:
+ if (value_less (result_val,
+ value_zero (value_type (result_val), not_lval)))
+ result_val = value_neg (result_val);
+ break;
+ case DW_OP_neg:
+ result_val = value_neg (result_val);
+ break;
+ case DW_OP_not:
+ dwarf_require_integral (value_type (result_val));
+ result_val = value_complement (result_val);
+ break;
+ case DW_OP_plus_uconst:
+ dwarf_require_integral (value_type (result_val));
+ result = value_as_long (result_val);
+ op_ptr = read_uleb128 (op_ptr, op_end, ®);
+ result += reg;
+ result_val = value_from_ulongest (address_type, result);
+ break;
+ }
+ }
break;
case DW_OP_and:
case DW_OP_ne:
{
/* Binary operations. */
- ULONGEST first, second;
+ struct value *first, *second;
second = dwarf_expr_fetch (ctx, 0);
dwarf_expr_pop (ctx);
first = dwarf_expr_fetch (ctx, 0);
dwarf_expr_pop (ctx);
+ if (! base_types_equal_p (value_type (first), value_type (second)))
+ error (_("Incompatible types on DWARF stack"));
+
switch (op)
{
case DW_OP_and:
- result = first & second;
+ dwarf_require_integral (value_type (first));
+ dwarf_require_integral (value_type (second));
+ result_val = value_binop (first, second, BINOP_BITWISE_AND);
break;
case DW_OP_div:
- if (!second)
- error (_("Division by zero"));
- result = sign_ext (first) / sign_ext (second);
+ result_val = value_binop (first, second, BINOP_DIV);
break;
case DW_OP_minus:
- result = first - second;
+ result_val = value_binop (first, second, BINOP_SUB);
break;
case DW_OP_mod:
- if (!second)
- error (_("Division by zero"));
- result = first % second;
+ {
+ int cast_back = 0;
+ struct type *orig_type = value_type (first);
+
+ /* We have to special-case "old-style" untyped values
+ -- these must have mod computed using unsigned
+ math. */
+ if (orig_type == address_type)
+ {
+ struct type *utype
+ = get_unsigned_type (ctx->gdbarch, orig_type);
+
+ cast_back = 1;
+ first = value_cast (utype, first);
+ second = value_cast (utype, second);
+ }
+ /* Note that value_binop doesn't handle float or
+ decimal float here. This seems unimportant. */
+ result_val = value_binop (first, second, BINOP_MOD);
+ if (cast_back)
+ result_val = value_cast (orig_type, result_val);
+ }
break;
case DW_OP_mul:
- result = first * second;
+ result_val = value_binop (first, second, BINOP_MUL);
break;
case DW_OP_or:
- result = first | second;
+ dwarf_require_integral (value_type (first));
+ dwarf_require_integral (value_type (second));
+ result_val = value_binop (first, second, BINOP_BITWISE_IOR);
break;
case DW_OP_plus:
- result = first + second;
+ result_val = value_binop (first, second, BINOP_ADD);
break;
case DW_OP_shl:
- result = first << second;
+ dwarf_require_integral (value_type (first));
+ dwarf_require_integral (value_type (second));
+ result_val = value_binop (first, second, BINOP_LSH);
break;
case DW_OP_shr:
- result = first >> second;
+ dwarf_require_integral (value_type (first));
+ dwarf_require_integral (value_type (second));
+ if (!TYPE_UNSIGNED (value_type (first)))
+ {
+ struct type *utype
+ = get_unsigned_type (ctx->gdbarch, value_type (first));
+
+ first = value_cast (utype, first);
+ }
+
+ result_val = value_binop (first, second, BINOP_RSH);
+ /* Make sure we wind up with the same type we started
+ with. */
+ if (value_type (result_val) != value_type (second))
+ result_val = value_cast (value_type (second), result_val);
break;
case DW_OP_shra:
- result = sign_ext (first) >> second;
+ dwarf_require_integral (value_type (first));
+ dwarf_require_integral (value_type (second));
+ if (TYPE_UNSIGNED (value_type (first)))
+ {
+ struct type *stype
+ = get_signed_type (ctx->gdbarch, value_type (first));
+
+ first = value_cast (stype, first);
+ }
+
+ result_val = value_binop (first, second, BINOP_RSH);
+ /* Make sure we wind up with the same type we started
+ with. */
+ if (value_type (result_val) != value_type (second))
+ result_val = value_cast (value_type (second), result_val);
break;
case DW_OP_xor:
- result = first ^ second;
+ dwarf_require_integral (value_type (first));
+ dwarf_require_integral (value_type (second));
+ result_val = value_binop (first, second, BINOP_BITWISE_XOR);
break;
case DW_OP_le:
- result = sign_ext (first) <= sign_ext (second);
+ /* A <= B is !(B < A). */
+ result = ! value_less (second, first);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_ge:
- result = sign_ext (first) >= sign_ext (second);
+ /* A >= B is !(A < B). */
+ result = ! value_less (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_eq:
- result = sign_ext (first) == sign_ext (second);
+ result = value_equal (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_lt:
- result = sign_ext (first) < sign_ext (second);
+ result = value_less (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_gt:
- result = sign_ext (first) > sign_ext (second);
+ /* A > B is B < A. */
+ result = value_less (second, first);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_ne:
- result = sign_ext (first) != sign_ext (second);
+ result = ! value_equal (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
default:
internal_error (__FILE__, __LINE__,
break;
case DW_OP_call_frame_cfa:
- result = (ctx->get_frame_cfa) (ctx->baton);
+ result = (ctx->funcs->get_frame_cfa) (ctx->baton);
+ result_val = value_from_ulongest (address_type, result);
in_stack_memory = 1;
break;
case DW_OP_GNU_push_tls_address:
/* Variable is at a constant offset in the thread-local
storage block into the objfile for the current thread and
- the dynamic linker module containing this expression. Here
+ the dynamic linker module containing this expression. Here
we return returns the offset from that base. The top of the
stack has the offset from the beginning of the thread
control block at which the variable is located. Nothing
should follow this operator, so the top of stack would be
returned. */
- result = dwarf_expr_fetch (ctx, 0);
+ result = value_as_long (dwarf_expr_fetch (ctx, 0));
dwarf_expr_pop (ctx);
- result = (ctx->get_tls_address) (ctx->baton, result);
+ result = (ctx->funcs->get_tls_address) (ctx->baton, result);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_skip:
goto no_push;
case DW_OP_bra:
- offset = extract_signed_integer (op_ptr, 2, byte_order);
- op_ptr += 2;
- if (dwarf_expr_fetch (ctx, 0) != 0)
- op_ptr += offset;
- dwarf_expr_pop (ctx);
+ {
+ struct value *val;
+
+ offset = extract_signed_integer (op_ptr, 2, byte_order);
+ op_ptr += 2;
+ val = dwarf_expr_fetch (ctx, 0);
+ dwarf_require_integral (value_type (val));
+ if (value_as_long (val) != 0)
+ op_ptr += offset;
+ dwarf_expr_pop (ctx);
+ }
goto no_push;
case DW_OP_nop:
case DW_OP_call2:
result = extract_unsigned_integer (op_ptr, 2, byte_order);
op_ptr += 2;
- ctx->dwarf_call (ctx, result);
+ ctx->funcs->dwarf_call (ctx, result);
goto no_push;
case DW_OP_call4:
result = extract_unsigned_integer (op_ptr, 4, byte_order);
op_ptr += 4;
- ctx->dwarf_call (ctx, result);
+ ctx->funcs->dwarf_call (ctx, result);
goto no_push;
+
+ case DW_OP_GNU_entry_value:
+ {
+ ULONGEST len;
+ int dwarf_reg;
+ CORE_ADDR deref_size;
+
+ op_ptr = read_uleb128 (op_ptr, op_end, &len);
+ if (op_ptr + len > op_end)
+ error (_("DW_OP_GNU_entry_value: too few bytes available."));
+
+ dwarf_reg = dwarf_block_to_dwarf_reg (op_ptr, op_ptr + len);
+ if (dwarf_reg != -1)
+ {
+ op_ptr += len;
+ ctx->funcs->push_dwarf_reg_entry_value (ctx, dwarf_reg,
+ 0 /* unused */,
+ -1 /* deref_size */);
+ goto no_push;
+ }
+
+ dwarf_reg = dwarf_block_to_dwarf_reg_deref (op_ptr, op_ptr + len,
+ &deref_size);
+ if (dwarf_reg != -1)
+ {
+ if (deref_size == -1)
+ deref_size = ctx->addr_size;
+ op_ptr += len;
+ ctx->funcs->push_dwarf_reg_entry_value (ctx, dwarf_reg,
+ 0 /* unused */,
+ deref_size);
+ goto no_push;
+ }
+
+ error (_("DWARF-2 expression error: DW_OP_GNU_entry_value is "
+ "supported only for single DW_OP_reg* "
+ "or for DW_OP_breg*(0)+DW_OP_deref*"));
+ }
+
+ case DW_OP_GNU_const_type:
+ {
+ ULONGEST type_die;
+ int n;
+ const gdb_byte *data;
+ struct type *type;
+
+ op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+ n = *op_ptr++;
+ data = op_ptr;
+ op_ptr += n;
+
+ type = dwarf_get_base_type (ctx, type_die, n);
+ result_val = value_from_contents (type, data);
+ }
+ break;
+
+ case DW_OP_GNU_regval_type:
+ {
+ ULONGEST type_die;
+ struct type *type;
+
+ op_ptr = read_uleb128 (op_ptr, op_end, ®);
+ op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+
+ type = dwarf_get_base_type (ctx, type_die, 0);
+ result = (ctx->funcs->read_reg) (ctx->baton, reg);
+ result_val = value_from_ulongest (address_type, result);
+ result_val = value_from_contents (type,
+ value_contents_all (result_val));
+ }
+ break;
+
+ case DW_OP_GNU_convert:
+ case DW_OP_GNU_reinterpret:
+ {
+ ULONGEST type_die;
+ struct type *type;
+
+ op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+
+ if (type_die == 0)
+ type = address_type;
+ else
+ type = dwarf_get_base_type (ctx, type_die, 0);
+
+ result_val = dwarf_expr_fetch (ctx, 0);
+ dwarf_expr_pop (ctx);
+
+ if (op == DW_OP_GNU_convert)
+ result_val = value_cast (type, result_val);
+ else if (type == value_type (result_val))
+ {
+ /* Nothing. */
+ }
+ else if (TYPE_LENGTH (type)
+ != TYPE_LENGTH (value_type (result_val)))
+ error (_("DW_OP_GNU_reinterpret has wrong size"));
+ else
+ result_val
+ = value_from_contents (type,
+ value_contents_all (result_val));
+ }
+ break;
default:
error (_("Unhandled dwarf expression opcode 0x%x"), op);
}
/* Most things push a result value. */
- dwarf_expr_push (ctx, result, in_stack_memory);
- no_push:;
+ gdb_assert (result_val != NULL);
+ dwarf_expr_push (ctx, result_val, in_stack_memory);
+ no_push:
+ ;
}
/* To simplify our main caller, if the result is an implicit
if (ctx->location == DWARF_VALUE_IMPLICIT_POINTER)
add_piece (ctx, 8 * ctx->addr_size, 0);
+abort_expression:
ctx->recursion_depth--;
gdb_assert (ctx->recursion_depth >= 0);
-#undef sign_ext
+}
+
+/* Stub dwarf_expr_context_funcs.get_frame_base implementation. */
+
+void
+ctx_no_get_frame_base (void *baton, const gdb_byte **start, size_t *length)
+{
+ error (_("%s is invalid in this context"), "DW_OP_fbreg");
+}
+
+/* Stub dwarf_expr_context_funcs.get_frame_cfa implementation. */
+
+CORE_ADDR
+ctx_no_get_frame_cfa (void *baton)
+{
+ error (_("%s is invalid in this context"), "DW_OP_call_frame_cfa");
+}
+
+/* Stub dwarf_expr_context_funcs.get_frame_pc implementation. */
+
+CORE_ADDR
+ctx_no_get_frame_pc (void *baton)
+{
+ error (_("%s is invalid in this context"), "DW_OP_GNU_implicit_pointer");
+}
+
+/* Stub dwarf_expr_context_funcs.get_tls_address implementation. */
+
+CORE_ADDR
+ctx_no_get_tls_address (void *baton, CORE_ADDR offset)
+{
+ error (_("%s is invalid in this context"), "DW_OP_GNU_push_tls_address");
+}
+
+/* Stub dwarf_expr_context_funcs.dwarf_call implementation. */
+
+void
+ctx_no_dwarf_call (struct dwarf_expr_context *ctx, size_t die_offset)
+{
+ error (_("%s is invalid in this context"), "DW_OP_call*");
+}
+
+/* Stub dwarf_expr_context_funcs.get_base_type implementation. */
+
+struct type *
+ctx_no_get_base_type (struct dwarf_expr_context *ctx, size_t die)
+{
+ error (_("Support for typed DWARF is not supported in this context"));
+}
+
+/* Stub dwarf_expr_context_funcs.push_dwarf_block_entry_value
+ implementation. */
+
+void
+ctx_no_push_dwarf_reg_entry_value (struct dwarf_expr_context *ctx,
+ int dwarf_reg, CORE_ADDR fb_offset,
+ int deref_size)
+{
+ internal_error (__FILE__, __LINE__,
+ _("Support for DW_OP_GNU_entry_value is unimplemented"));
+}
+
+void
+_initialize_dwarf2expr (void)
+{
+ dwarf_arch_cookie
+ = gdbarch_data_register_post_init (dwarf_gdbarch_types_init);
}
projects / external / binutils.git / blobdiff