/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001-2003, 2005, 2007-2012 Free Software Foundation,
- Inc.
+ Copyright (C) 2001-2015 Free Software Foundation, Inc.
#include "gdbcore.h"
#include "dwarf2.h"
#include "dwarf2expr.h"
-#include "gdb_assert.h"
/* Local prototypes. */
}
else if (p->location == DWARF_VALUE_IMPLICIT_POINTER)
{
- p->v.ptr.die.cu_off = 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. R can be NULL, the constant is then only skipped. */
+/* 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 |= ((ULONGEST) (byte & 0x7f)) << shift;
- if ((byte & 0x80) == 0)
- break;
- shift += 7;
- }
- if (r)
- *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. R can be NULL, the constant is then only skipped. */
+/* 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 |= ((ULONGEST) (byte & 0x7f)) << shift;
- shift += 7;
- if ((byte & 0x80) == 0)
- break;
- }
- if (shift < (sizeof (*r) * 8) && (byte & 0x40) != 0)
- result |= -(((LONGEST) 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;
+}
- if (r)
- *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
int
dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end)
{
- ULONGEST dwarf_reg;
+ uint64_t dwarf_reg;
if (buf_end <= buf)
return -1;
if (*buf == DW_OP_GNU_regval_type)
{
buf++;
- buf = read_uleb128 (buf, buf_end, &dwarf_reg);
- buf = read_uleb128 (buf, buf_end, NULL);
+ 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 = read_uleb128 (buf, buf_end, &dwarf_reg);
+ buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
+ if (buf == NULL)
+ return -1;
}
else
return -1;
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;
+ 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 = read_uleb128 (buf, buf_end, &dwarf_reg);
+ 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 = read_sleb128 (buf, buf_end, &offset);
- if (offset != 0)
+ buf = gdb_read_sleb128 (buf, buf_end, &offset);
+ if (buf == NULL)
return -1;
-
- if (buf >= buf_end)
+ if (offset != 0)
return -1;
if (*buf == DW_OP_deref)
dwarf_block_to_fb_offset (const gdb_byte *buf, const gdb_byte *buf_end,
CORE_ADDR *fb_offset_return)
{
- LONGEST fb_offset;
+ int64_t fb_offset;
if (buf_end <= buf)
return 0;
return 0;
buf++;
- buf = read_sleb128 (buf, buf_end, &fb_offset);
+ 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;
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;
+ uint64_t dwarf_reg;
+ int64_t sp_offset;
if (buf_end <= buf)
return 0;
if (*buf != DW_OP_bregx)
return 0;
buf++;
- buf = read_uleb128 (buf, buf_end, &dwarf_reg);
+ buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
+ if (buf == NULL)
+ return 0;
}
if (gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_reg)
!= gdbarch_sp_regnum (gdbarch))
return 0;
- buf = read_sleb128 (buf, buf_end, &sp_offset);
+ 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;
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
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;
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;
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 cu_offset kind. */
+ /* The referred-to DIE of sect_offset kind. */
ctx->len = extract_unsigned_integer (op_ptr, ctx->ref_addr_size,
byte_order);
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->funcs->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->funcs->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
if (ctx->location == DWARF_VALUE_MEMORY)
result = dwarf_expr_fetch_address (ctx, 0);
else if (ctx->location == DWARF_VALUE_REGISTER)
- result = (ctx->funcs->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"));
{
cu_offset type_die;
- op_ptr = read_uleb128 (op_ptr, op_end, &uoffset);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
type_die.cu_off = uoffset;
type = dwarf_get_base_type (ctx, type_die, 0);
}
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_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
case DW_OP_GNU_entry_value:
{
- ULONGEST len;
- int dwarf_reg;
+ uint64_t len;
CORE_ADDR deref_size;
+ union call_site_parameter_u kind_u;
- 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_GNU_entry_value: too few bytes available."));
- dwarf_reg = dwarf_block_to_dwarf_reg (op_ptr, op_ptr + len);
- if (dwarf_reg != -1)
+ 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, dwarf_reg,
- 0 /* unused */,
+ ctx->funcs->push_dwarf_reg_entry_value (ctx,
+ CALL_SITE_PARAMETER_DWARF_REG,
+ kind_u,
-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)
+ 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, dwarf_reg,
- 0 /* unused */,
- deref_size);
+ ctx->funcs->push_dwarf_reg_entry_value (ctx,
+ CALL_SITE_PARAMETER_DWARF_REG,
+ kind_u, deref_size);
goto no_push;
}
"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:
{
cu_offset type_die;
const gdb_byte *data;
struct type *type;
- op_ptr = read_uleb128 (op_ptr, op_end, &uoffset);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
type_die.cu_off = uoffset;
n = *op_ptr++;
data = op_ptr;
cu_offset type_die;
struct type *type;
- op_ptr = read_uleb128 (op_ptr, op_end, ®);
- op_ptr = read_uleb128 (op_ptr, op_end, &uoffset);
+ 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->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));
+ result_val = ctx->funcs->get_reg_value (ctx->baton, type, reg);
}
break;
cu_offset type_die;
struct type *type;
- op_ptr = read_uleb128 (op_ptr, op_end, &uoffset);
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
type_die.cu_off = uoffset;
if (type_die.cu_off == 0)
}
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);
}
void
ctx_no_push_dwarf_reg_entry_value (struct dwarf_expr_context *ctx,
- int dwarf_reg, CORE_ADDR fb_offset,
+ 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;
projects / binutils.git / blobdiff