/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2016 Free Software Foundation, Inc.
Contributed by Daniel Berlin (dan@dberlin.org)
#include "gdbcore.h"
#include "dwarf2.h"
#include "dwarf2expr.h"
-#include "gdb_assert.h"
+#include "dwarf2loc.h"
/* Local prototypes. */
static struct type *
dwarf_expr_address_type (struct dwarf_expr_context *ctx)
{
- struct dwarf_gdbarch_types *types = gdbarch_data (ctx->gdbarch,
- dwarf_arch_cookie);
+ struct dwarf_gdbarch_types *types
+ = (struct dwarf_gdbarch_types *) gdbarch_data (ctx->gdbarch,
+ dwarf_arch_cookie);
int ndx;
if (ctx->addr_size == 2)
{
struct dwarf_expr_context *retval;
- retval = xcalloc (1, sizeof (struct dwarf_expr_context));
+ retval = XCNEW (struct dwarf_expr_context);
retval->stack_len = 0;
retval->stack_allocated = 10;
- retval->stack = xmalloc (retval->stack_allocated
- * sizeof (struct dwarf_stack_value));
+ retval->stack = XNEWVEC (struct dwarf_stack_value, retval->stack_allocated);
retval->num_pieces = 0;
retval->pieces = 0;
retval->max_recursion_depth = 0x100;
- retval->mark = value_mark ();
return retval;
}
void
free_dwarf_expr_context (struct dwarf_expr_context *ctx)
{
- value_free_to_mark (ctx->mark);
xfree (ctx->stack);
xfree (ctx->pieces);
xfree (ctx);
static void
free_dwarf_expr_context_cleanup (void *arg)
{
- free_dwarf_expr_context (arg);
+ free_dwarf_expr_context ((struct dwarf_expr_context *) arg);
}
/* Return a cleanup that calls free_dwarf_expr_context. */
{
size_t newlen = ctx->stack_len + need + 10;
- ctx->stack = xrealloc (ctx->stack,
- newlen * sizeof (struct dwarf_stack_value));
+ ctx->stack = XRESIZEVEC (struct dwarf_stack_value, ctx->stack, newlen);
ctx->stack_allocated = newlen;
}
}
}
}
+/* 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
for those architectures which require it. */
if (gdbarch_integer_to_address_p (ctx->gdbarch))
{
- gdb_byte *buf = alloca (ctx->addr_size);
+ gdb_byte *buf = (gdb_byte *) alloca (ctx->addr_size);
struct type *int_type = get_unsigned_type (ctx->gdbarch,
value_type (result_val));
ctx->num_pieces++;
- ctx->pieces = xrealloc (ctx->pieces,
- (ctx->num_pieces
- * sizeof (struct dwarf_expr_piece)));
+ ctx->pieces
+ = XRESIZEVEC (struct dwarf_expr_piece, ctx->pieces, ctx->num_pieces);
p = &ctx->pieces[ctx->num_pieces - 1];
p->location = ctx->location;
}
else if (p->location == DWARF_VALUE_IMPLICIT_POINTER)
{
- p->v.ptr.die = ctx->len;
+ p->v.ptr.die.sect_off = ctx->len;
p->v.ptr.offset = value_as_long (dwarf_expr_fetch (ctx, 0));
}
else if (p->location == DWARF_VALUE_REGISTER)
gdb_assert (ctx->recursion_depth == old_recursion_depth);
}
-/* 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. */
+/* Helper to read a uleb128 value or throw an error. */
const gdb_byte *
-read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end, ULONGEST * r)
+safe_read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
+ uint64_t *r)
{
- unsigned shift = 0;
- ULONGEST result = 0;
- gdb_byte byte;
-
- while (1)
- {
- if (buf >= buf_end)
- error (_("read_uleb128: Corrupted DWARF expression."));
-
- byte = *buf++;
- result |= (byte & 0x7f) << shift;
- if ((byte & 0x80) == 0)
- break;
- shift += 7;
- }
- *r = result;
+ buf = gdb_read_uleb128 (buf, buf_end, r);
+ if (buf == NULL)
+ error (_("DWARF expression error: ran off end of buffer reading uleb128 value"));
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. */
+/* Helper to read a sleb128 value or throw an error. */
const gdb_byte *
-read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end, LONGEST * r)
+safe_read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
+ int64_t *r)
{
- unsigned shift = 0;
- LONGEST result = 0;
- gdb_byte byte;
-
- while (1)
- {
- if (buf >= buf_end)
- error (_("read_sleb128: Corrupted DWARF expression."));
-
- byte = *buf++;
- result |= (byte & 0x7f) << shift;
- shift += 7;
- if ((byte & 0x80) == 0)
- break;
- }
- if (shift < (sizeof (*r) * 8) && (byte & 0x40) != 0)
- result |= -(1 << shift);
+ buf = gdb_read_sleb128 (buf, buf_end, r);
+ if (buf == NULL)
+ error (_("DWARF expression error: ran off end of buffer reading sleb128 value"));
+ return buf;
+}
- *r = result;
+const gdb_byte *
+safe_skip_leb128 (const gdb_byte *buf, const gdb_byte *buf_end)
+{
+ buf = gdb_skip_leb128 (buf, buf_end);
+ if (buf == NULL)
+ error (_("DWARF expression error: ran off end of buffer reading leb128 value"));
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);
}
size. */
static struct type *
-dwarf_get_base_type (struct dwarf_expr_context *ctx, ULONGEST die, int size)
+dwarf_get_base_type (struct dwarf_expr_context *ctx, cu_offset die, int size)
{
struct type *result;
- if (ctx->get_base_type)
+ if (ctx->funcs->get_base_type)
{
- result = ctx->get_base_type (ctx, die);
+ 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"));
}
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)
+{
+ uint64_t 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 = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
+ if (buf == NULL)
+ return -1;
+ buf = gdb_skip_leb128 (buf, buf_end);
+ if (buf == NULL)
+ return -1;
+ }
+ else if (*buf == DW_OP_regx)
+ {
+ buf++;
+ buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
+ if (buf == NULL)
+ return -1;
+ }
+ 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)
+{
+ uint64_t dwarf_reg;
+ int64_t offset;
+
+ if (buf_end <= buf)
+ return -1;
+
+ if (*buf >= DW_OP_breg0 && *buf <= DW_OP_breg31)
+ {
+ dwarf_reg = *buf - DW_OP_breg0;
+ buf++;
+ if (buf >= buf_end)
+ return -1;
+ }
+ else if (*buf == DW_OP_bregx)
+ {
+ buf++;
+ buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
+ if (buf == NULL)
+ return -1;
+ if ((int) dwarf_reg != dwarf_reg)
+ return -1;
+ }
+ else
+ return -1;
+
+ buf = gdb_read_sleb128 (buf, buf_end, &offset);
+ if (buf == NULL)
+ return -1;
+ if (offset != 0)
+ 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)
+{
+ int64_t fb_offset;
+
+ if (buf_end <= buf)
+ return 0;
+
+ if (*buf != DW_OP_fbreg)
+ return 0;
+ buf++;
+
+ buf = gdb_read_sleb128 (buf, buf_end, &fb_offset);
+ if (buf == NULL)
+ return 0;
+ *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)
+{
+ uint64_t dwarf_reg;
+ int64_t 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 = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
+ if (buf == NULL)
+ return 0;
+ }
+
+ if (dwarf_reg_to_regnum (gdbarch, dwarf_reg)
+ != gdbarch_sp_regnum (gdbarch))
+ return 0;
+
+ buf = gdb_read_sleb128 (buf, buf_end, &sp_offset);
+ if (buf == NULL)
+ return 0;
+ *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. */
while (op_ptr < op_end)
{
- enum dwarf_location_atom op = *op_ptr++;
+ enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr++;
ULONGEST result;
/* Assume the value is not in stack memory.
Code that knows otherwise sets this to 1.
This is just an optimization, so it's always ok to punt
and leave this as 0. */
int in_stack_memory = 0;
- ULONGEST uoffset, reg;
- LONGEST offset;
+ uint64_t uoffset, reg;
+ int64_t 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_lit0:
result_val = value_from_ulongest (address_type, result);
break;
+ case DW_OP_GNU_addr_index:
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ result = (ctx->funcs->get_addr_index) (ctx->baton, uoffset);
+ result += ctx->offset;
+ result_val = value_from_ulongest (address_type, result);
+ break;
+ case DW_OP_GNU_const_index:
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ result = (ctx->funcs->get_addr_index) (ctx->baton, uoffset);
+ 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 += 8;
break;
case DW_OP_constu:
- op_ptr = read_uleb128 (op_ptr, op_end, &uoffset);
+ op_ptr = safe_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);
+ op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
result = offset;
result_val = value_from_ulongest (address_type, result);
break;
&& *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;
break;
case DW_OP_regx:
- op_ptr = read_uleb128 (op_ptr, op_end, ®);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx");
result = reg;
case DW_OP_implicit_value:
{
- ULONGEST len;
+ uint64_t len;
- op_ptr = read_uleb128 (op_ptr, op_end, &len);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &len);
if (op_ptr + len > op_end)
error (_("DW_OP_implicit_value: too few bytes available."));
ctx->len = len;
case DW_OP_GNU_implicit_pointer:
{
- ULONGEST die;
- LONGEST len;
+ int64_t len;
- /* The referred-to DIE. */
- ctx->len = extract_unsigned_integer (op_ptr, ctx->addr_size,
+ 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 of sect_offset kind. */
+ 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);
+ op_ptr = safe_read_sleb128 (op_ptr, op_end, &len);
result = (ULONGEST) len;
result_val = value_from_ulongest (address_type, result);
case DW_OP_breg30:
case DW_OP_breg31:
{
- op_ptr = read_sleb128 (op_ptr, op_end, &offset);
- result = (ctx->read_reg) (ctx->baton, op - DW_OP_breg0);
+ op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
+ result = (ctx->funcs->read_addr_from_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);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
+ op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
+ result = (ctx->funcs->read_addr_from_reg) (ctx->baton, reg);
result += offset;
result_val = value_from_ulongest (address_type, result);
}
size_t datalen;
unsigned int before_stack_len;
- op_ptr = read_sleb128 (op_ptr, op_end, &offset);
+ op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
/* Rather than create a whole new context, we simply
record the stack length before execution, then reset it
afterwards, effectively erasing whatever the recursive
/* 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,
- value_as_long (dwarf_expr_fetch (ctx, 0)));
+ result = (ctx->funcs->read_addr_from_reg)
+ (ctx->baton,
+ value_as_long (dwarf_expr_fetch (ctx, 0)));
else
error (_("Not implemented: computing frame "
"base using explicit value operator"));
case DW_OP_GNU_deref_type:
{
int addr_size = (op == DW_OP_deref ? ctx->addr_size : *op_ptr++);
- gdb_byte *buf = alloca (addr_size);
+ gdb_byte *buf = (gdb_byte *) alloca (addr_size);
CORE_ADDR addr = dwarf_expr_fetch_address (ctx, 0);
struct type *type;
if (op == DW_OP_GNU_deref_type)
{
- ULONGEST type_die;
+ cu_offset type_die;
- op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ type_die.cu_off = uoffset;
type = dwarf_get_base_type (ctx, type_die, 0);
}
else
type = address_type;
- (ctx->read_mem) (ctx->baton, buf, addr, addr_size);
+ (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 = (gdb_byte *) 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_plus_uconst:
dwarf_require_integral (value_type (result_val));
result = value_as_long (result_val);
- op_ptr = read_uleb128 (op_ptr, op_end, ®);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
result += reg;
result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_shr:
dwarf_require_integral (value_type (first));
dwarf_require_integral (value_type (second));
- if (value_type (first) == address_type)
+ if (!TYPE_UNSIGNED (value_type (first)))
{
struct type *utype
= get_unsigned_type (ctx->gdbarch, value_type (first));
case DW_OP_shra:
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:
dwarf_require_integral (value_type (first));
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:
+ case DW_OP_form_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
returned. */
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_piece:
{
- ULONGEST size;
+ uint64_t size;
/* Record the piece. */
- op_ptr = read_uleb128 (op_ptr, op_end, &size);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &size);
add_piece (ctx, 8 * size, 0);
/* Pop off the address/regnum, and reset the location
case DW_OP_bit_piece:
{
- ULONGEST size, offset;
+ uint64_t size, offset;
/* Record the piece. */
- op_ptr = read_uleb128 (op_ptr, op_end, &size);
- op_ptr = read_uleb128 (op_ptr, op_end, &offset);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &size);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &offset);
add_piece (ctx, size, offset);
/* Pop off the address/regnum, and reset the location
goto no_push;
case DW_OP_call2:
- result = extract_unsigned_integer (op_ptr, 2, byte_order);
- op_ptr += 2;
- ctx->dwarf_call (ctx, result);
+ {
+ cu_offset offset;
+
+ offset.cu_off = extract_unsigned_integer (op_ptr, 2, byte_order);
+ op_ptr += 2;
+ ctx->funcs->dwarf_call (ctx, offset);
+ }
goto no_push;
case DW_OP_call4:
- result = extract_unsigned_integer (op_ptr, 4, byte_order);
- op_ptr += 4;
- ctx->dwarf_call (ctx, result);
+ {
+ cu_offset offset;
+
+ offset.cu_off = extract_unsigned_integer (op_ptr, 4, byte_order);
+ op_ptr += 4;
+ ctx->funcs->dwarf_call (ctx, offset);
+ }
goto no_push;
case DW_OP_GNU_entry_value:
- /* This operation is not yet supported by GDB. */
- ctx->location = DWARF_VALUE_OPTIMIZED_OUT;
- ctx->stack_len = 0;
- ctx->num_pieces = 0;
- goto abort_expression;
+ {
+ uint64_t len;
+ CORE_ADDR deref_size;
+ union call_site_parameter_u kind_u;
+
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &len);
+ if (op_ptr + len > op_end)
+ error (_("DW_OP_GNU_entry_value: too few bytes available."));
+
+ kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (op_ptr, op_ptr + len);
+ if (kind_u.dwarf_reg != -1)
+ {
+ op_ptr += len;
+ ctx->funcs->push_dwarf_reg_entry_value (ctx,
+ CALL_SITE_PARAMETER_DWARF_REG,
+ kind_u,
+ -1 /* deref_size */);
+ goto no_push;
+ }
+
+ kind_u.dwarf_reg = dwarf_block_to_dwarf_reg_deref (op_ptr,
+ op_ptr + len,
+ &deref_size);
+ if (kind_u.dwarf_reg != -1)
+ {
+ if (deref_size == -1)
+ deref_size = ctx->addr_size;
+ op_ptr += len;
+ ctx->funcs->push_dwarf_reg_entry_value (ctx,
+ CALL_SITE_PARAMETER_DWARF_REG,
+ kind_u, 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_parameter_ref:
+ {
+ union call_site_parameter_u kind_u;
+
+ kind_u.param_offset.cu_off = extract_unsigned_integer (op_ptr, 4,
+ byte_order);
+ op_ptr += 4;
+ ctx->funcs->push_dwarf_reg_entry_value (ctx,
+ CALL_SITE_PARAMETER_PARAM_OFFSET,
+ kind_u,
+ -1 /* deref_size */);
+ }
+ goto no_push;
case DW_OP_GNU_const_type:
{
- ULONGEST type_die;
+ cu_offset type_die;
int n;
const gdb_byte *data;
struct type *type;
- op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ type_die.cu_off = uoffset;
n = *op_ptr++;
data = op_ptr;
op_ptr += n;
case DW_OP_GNU_regval_type:
{
- ULONGEST type_die;
+ cu_offset type_die;
struct type *type;
- op_ptr = read_uleb128 (op_ptr, op_end, ®);
- op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ type_die.cu_off = uoffset;
type = dwarf_get_base_type (ctx, type_die, 0);
- result = (ctx->read_reg) (ctx->baton, reg);
- result_val = value_from_ulongest (type, result);
+ result_val = ctx->funcs->get_reg_value (ctx->baton, type, reg);
}
break;
case DW_OP_GNU_convert:
case DW_OP_GNU_reinterpret:
{
- ULONGEST type_die;
+ cu_offset type_die;
struct type *type;
- op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ type_die.cu_off = uoffset;
- type = dwarf_get_base_type (ctx, type_die, 0);
+ if (type_die.cu_off == 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);
}
break;
+ case DW_OP_push_object_address:
+ /* Return the address of the object we are currently observing. */
+ result = (ctx->funcs->get_object_address) (ctx->baton);
+ result_val = value_from_ulongest (address_type, result);
+ break;
+
default:
error (_("Unhandled dwarf expression opcode 0x%x"), op);
}
gdb_assert (ctx->recursion_depth >= 0);
}
+/* 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_form_tls_address");
+}
+
+/* Stub dwarf_expr_context_funcs.dwarf_call implementation. */
+
+void
+ctx_no_dwarf_call (struct dwarf_expr_context *ctx, cu_offset 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, cu_offset 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,
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u,
+ int deref_size)
+{
+ internal_error (__FILE__, __LINE__,
+ _("Support for DW_OP_GNU_entry_value is unimplemented"));
+}
+
+/* Stub dwarf_expr_context_funcs.get_addr_index implementation. */
+
+CORE_ADDR
+ctx_no_get_addr_index (void *baton, unsigned int index)
+{
+ error (_("%s is invalid in this context"), "DW_OP_GNU_addr_index");
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_dwarf2expr;
+
void
_initialize_dwarf2expr (void)
{
projects / deliverable / binutils-gdb.git / blobdiff