X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fdwarf2expr.c;h=36c9f66297690ce881e648e95452a8ea50a1d5f7;hb=9fb5010805bdfe0eb8fc5db01e7f4c93b04c8f29;hp=410cd54c6227f198cb5c8a771d0958461dd13553;hpb=18ec983167982fde21392b3be307aaf15fd12c0d;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/dwarf2expr.c b/gdb/dwarf2expr.c
index 410cd54c62..36c9f66297 100644
--- a/gdb/dwarf2expr.c
+++ b/gdb/dwarf2expr.c
@@ -1,12 +1,14 @@
-/* Dwarf2 Expression Evaluator
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+/* DWARF 2 Expression Evaluator.
+
+ Copyright (C) 2001-2014 Free Software Foundation, Inc.
+
Contributed by Daniel Berlin (dan@dberlin.org)
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
@@ -15,22 +17,76 @@
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see . */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "value.h"
#include "gdbcore.h"
-#include "elf/dwarf2.h"
+#include "dwarf2.h"
#include "dwarf2expr.h"
+#include "gdb_assert.h"
/* Local prototypes. */
static void execute_stack_op (struct dwarf_expr_context *,
- unsigned char *, unsigned char *);
+ 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, "");
+
+ return types->dw_types[ndx];
+}
/* Create a new context for the expression evaluator. */
@@ -38,10 +94,15 @@ struct dwarf_expr_context *
new_dwarf_expr_context (void)
{
struct dwarf_expr_context *retval;
+
retval = xcalloc (1, sizeof (struct dwarf_expr_context));
retval->stack_len = 0;
retval->stack_allocated = 10;
- retval->stack = xmalloc (retval->stack_allocated * sizeof (CORE_ADDR));
+ retval->stack = xmalloc (retval->stack_allocated
+ * sizeof (struct dwarf_stack_value));
+ retval->num_pieces = 0;
+ retval->pieces = 0;
+ retval->max_recursion_depth = 0x100;
return retval;
}
@@ -51,9 +112,26 @@ void
free_dwarf_expr_context (struct dwarf_expr_context *ctx)
{
xfree (ctx->stack);
+ xfree (ctx->pieces);
xfree (ctx);
}
+/* Helper for make_cleanup_free_dwarf_expr_context. */
+
+static void
+free_dwarf_expr_context_cleanup (void *arg)
+{
+ free_dwarf_expr_context (arg);
+}
+
+/* Return a cleanup that calls free_dwarf_expr_context. */
+
+struct cleanup *
+make_cleanup_free_dwarf_expr_context (struct dwarf_expr_context *ctx)
+{
+ return make_cleanup (free_dwarf_expr_context_cleanup, ctx);
+}
+
/* Expand the memory allocated to CTX's stack to contain at least
NEED more elements than are currently used. */
@@ -63,179 +141,536 @@ dwarf_expr_grow_stack (struct dwarf_expr_context *ctx, size_t need)
if (ctx->stack_len + need > ctx->stack_allocated)
{
size_t newlen = ctx->stack_len + need + 10;
+
ctx->stack = xrealloc (ctx->stack,
- newlen * sizeof (CORE_ADDR));
+ newlen * sizeof (struct dwarf_stack_value));
ctx->stack_allocated = newlen;
}
}
/* Push VALUE onto CTX's stack. */
-void
-dwarf_expr_push (struct dwarf_expr_context *ctx, CORE_ADDR value)
+static void
+dwarf_expr_push (struct dwarf_expr_context *ctx, struct value *value,
+ int in_stack_memory)
{
+ struct dwarf_stack_value *v;
+
dwarf_expr_grow_stack (ctx, 1);
- ctx->stack[ctx->stack_len++] = value;
+ 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)
- error ("dwarf expression stack underflow");
+ error (_("dwarf expression stack underflow"));
ctx->stack_len--;
}
/* Retrieve the N'th item on CTX's stack. */
-CORE_ADDR
+struct value *
dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n)
{
- if (ctx->stack_len < n)
- error ("Asked for position %d of stack, stack only has %d elements on it\n",
+ if (ctx->stack_len <= n)
+ error (_("Asked for position %d of stack, "
+ "stack only has %d elements on it."),
n, ctx->stack_len);
- return ctx->stack[ctx->stack_len - (1 + n)];
+ 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)
+{
+ 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
+ architectures (e.g. MIPS) use signed addresses and using
+ extract_unsigned_integer() will not produce a correct
+ result. Make sure we invoke gdbarch_integer_to_address()
+ for those architectures which require it. */
+ if (gdbarch_integer_to_address_p (ctx->gdbarch))
+ {
+ gdb_byte *buf = alloca (ctx->addr_size);
+ 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);
+ }
+
+ return (CORE_ADDR) result;
+}
+
+/* Retrieve the in_stack_memory flag of the N'th item on CTX's stack. */
+
+int
+dwarf_expr_fetch_in_stack_memory (struct dwarf_expr_context *ctx, int n)
+{
+ if (ctx->stack_len <= n)
+ error (_("Asked for position %d of stack, "
+ "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. */
+
+static int
+dwarf_expr_stack_empty_p (struct dwarf_expr_context *ctx)
+{
+ return ctx->stack_len == 0;
+}
+
+/* Add a new piece to CTX's piece list. */
+static void
+add_piece (struct dwarf_expr_context *ctx, ULONGEST size, ULONGEST offset)
+{
+ struct dwarf_expr_piece *p;
+
+ ctx->num_pieces++;
+
+ ctx->pieces = xrealloc (ctx->pieces,
+ (ctx->num_pieces
+ * sizeof (struct dwarf_expr_piece)));
+
+ p = &ctx->pieces[ctx->num_pieces - 1];
+ p->location = ctx->location;
+ p->size = size;
+ p->offset = offset;
+
+ if (p->location == DWARF_VALUE_LITERAL)
+ {
+ p->v.literal.data = ctx->data;
+ p->v.literal.length = ctx->len;
+ }
+ else if (dwarf_expr_stack_empty_p (ctx))
+ {
+ p->location = DWARF_VALUE_OPTIMIZED_OUT;
+ /* Also reset the context's location, for our callers. This is
+ a somewhat strange approach, but this lets us avoid setting
+ the location to DWARF_VALUE_MEMORY in all the individual
+ cases in the evaluator. */
+ ctx->location = DWARF_VALUE_OPTIMIZED_OUT;
+ }
+ else if (p->location == DWARF_VALUE_MEMORY)
+ {
+ p->v.mem.addr = dwarf_expr_fetch_address (ctx, 0);
+ p->v.mem.in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0);
+ }
+ else if (p->location == DWARF_VALUE_IMPLICIT_POINTER)
+ {
+ 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)
+ p->v.regno = value_as_long (dwarf_expr_fetch (ctx, 0));
+ else
+ {
+ p->v.value = dwarf_expr_fetch (ctx, 0);
+ }
}
/* Evaluate the expression at ADDR (LEN bytes long) using the context
CTX. */
void
-dwarf_expr_eval (struct dwarf_expr_context *ctx, unsigned char *addr,
+dwarf_expr_eval (struct dwarf_expr_context *ctx, const gdb_byte *addr,
size_t len)
{
+ int old_recursion_depth = ctx->recursion_depth;
+
execute_stack_op (ctx, addr, addr + len);
+
+ /* CTX RECURSION_DEPTH becomes invalid if an exception was thrown here. */
+
+ 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. */
-unsigned char *
-read_uleb128 (unsigned char *buf, unsigned char *buf_end, ULONGEST * r)
+const gdb_byte *
+safe_read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
+ uint64_t *r)
{
- unsigned shift = 0;
- ULONGEST result = 0;
- unsigned char byte;
+ 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;
+}
- while (1)
- {
- if (buf >= buf_end)
- error ("read_uleb128: Corrupted DWARF expression.");
+/* Helper to read a sleb128 value or throw an error. */
- byte = *buf++;
- result |= (byte & 0x7f) << shift;
- if ((byte & 0x80) == 0)
- break;
- shift += 7;
- }
- *r = result;
+const gdb_byte *
+safe_read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
+ int64_t *r)
+{
+ 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;
}
-/* 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. */
+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;
+}
+
+
+/* Check that the current operator is either at the end of an
+ expression, or that it is followed by a composition operator. */
-unsigned char *
-read_sleb128 (unsigned char *buf, unsigned char *buf_end, LONGEST * r)
+void
+dwarf_expr_require_composition (const gdb_byte *op_ptr, const gdb_byte *op_end,
+ const char *op_name)
{
- unsigned shift = 0;
- LONGEST result = 0;
- unsigned char byte;
+ /* It seems like DW_OP_GNU_uninit should be handled here. However,
+ it doesn't seem to make sense for DW_OP_*_value, and it was not
+ 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 conjunction with DW_OP_piece "
+ "or DW_OP_bit_piece."),
+ op_name);
+}
- while (1)
- {
- if (buf >= buf_end)
- error ("read_sleb128: Corrupted DWARF expression.");
+/* 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. */
- byte = *buf++;
- result |= (byte & 0x7f) << shift;
- shift += 7;
- if ((byte & 0x80) == 0)
- break;
+static struct type *
+dwarf_get_base_type (struct dwarf_expr_context *ctx, cu_offset 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"));
}
- if (shift < (sizeof (*r) * 8) && (byte & 0x40) != 0)
- result |= -(1 << shift);
+ else
+ /* Anything will do. */
+ result = builtin_type (ctx->gdbarch)->builtin_int;
- *r = result;
- return buf;
+ return result;
}
-/* Read an address from BUF, and verify that it doesn't extend past
- BUF_END. The address is returned, and *BYTES_READ is set to the
- number of bytes read from BUF. */
+/* If = DW_OP_reg0 && *buf <= DW_OP_reg31)
+ {
+ if (buf_end - buf != 1)
+ return -1;
+ return *buf - DW_OP_reg0;
+ }
- *bytes_read = TARGET_ADDR_BIT / TARGET_CHAR_BIT;
- result = extract_address (buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
- return result;
+ 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;
}
-/* Return the type of an address, for unsigned arithmetic. */
+/* If = DW_OP_breg0 && *buf <= DW_OP_breg31)
{
- case 2:
- return builtin_type_uint16;
- case 4:
- return builtin_type_uint32;
- case 8:
- return builtin_type_uint64;
- default:
- internal_error (__FILE__, __LINE__,
- "Unsupported address size.\n");
+ 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;
}
-/* Return the type of an address, for signed arithmetic. */
+/* If = DW_OP_breg0 && *buf <= DW_OP_breg31)
{
- case 2:
- return builtin_type_int16;
- case 4:
- return builtin_type_int32;
- case 8:
- return builtin_type_int64;
- default:
- internal_error (__FILE__, __LINE__,
- "Unsupported address size.\n");
+ 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 (gdbarch_dwarf2_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. */
static void
-execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
- unsigned char *op_end)
+execute_stack_op (struct dwarf_expr_context *ctx,
+ const gdb_byte *op_ptr, const gdb_byte *op_end)
{
- ctx->in_reg = 0;
+ 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. */
+
+ if (ctx->recursion_depth > ctx->max_recursion_depth)
+ error (_("DWARF-2 expression error: Loop detected (%d)."),
+ ctx->recursion_depth);
+ ctx->recursion_depth++;
while (op_ptr < op_end)
{
enum dwarf_location_atom op = *op_ptr++;
- CORE_ADDR result;
- ULONGEST uoffset, reg;
- LONGEST offset;
- int bytes_read;
+ ULONGEST result;
+ /* Assume the value is not in stack memory.
+ Code that knows otherwise sets this to 1.
+ Some arithmetic on stack addresses can probably be assumed to still
+ be a stack address, but we skip this complication for now.
+ This is just an optimization, so it's always ok to punt
+ and leave this as 0. */
+ int in_stack_memory = 0;
+ 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)
{
@@ -272,52 +707,83 @@ execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
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:
- result = dwarf2_read_address (op_ptr, op_end, &bytes_read);
- op_ptr += bytes_read;
+ result = extract_unsigned_integer (op_ptr,
+ ctx->addr_size, byte_order);
+ op_ptr += ctx->addr_size;
+ /* Some versions of GCC emit DW_OP_addr before
+ DW_OP_GNU_push_tls_address. In this case the value is an
+ index, not an address. We don't support things like
+ 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_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);
+ 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);
+ 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);
+ 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);
+ 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);
+ 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);
+ 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);
+ 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);
+ 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);
+ 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;
/* The DW_OP_reg operations are required to occur alone in
@@ -354,23 +820,71 @@ execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
case DW_OP_reg29:
case DW_OP_reg30:
case DW_OP_reg31:
- if (op_ptr != op_end && *op_ptr != DW_OP_piece)
- error ("DWARF-2 expression error: DW_OP_reg operations must be "
- "used either alone or in conjuction with DW_OP_piece.");
+ if (op_ptr != op_end
+ && *op_ptr != DW_OP_piece
+ && *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 conjunction with DW_OP_piece "
+ "or DW_OP_bit_piece."));
result = op - DW_OP_reg0;
- ctx->in_reg = 1;
-
+ result_val = value_from_ulongest (address_type, result);
+ ctx->location = DWARF_VALUE_REGISTER;
break;
case DW_OP_regx:
- op_ptr = read_uleb128 (op_ptr, op_end, ®);
- if (op_ptr != op_end && *op_ptr != DW_OP_piece)
- error ("DWARF-2 expression error: DW_OP_reg operations must be "
- "used either alone or in conjuction with DW_OP_piece.");
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
+ dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx");
result = reg;
- ctx->in_reg = 1;
+ result_val = value_from_ulongest (address_type, result);
+ ctx->location = DWARF_VALUE_REGISTER;
+ break;
+
+ case DW_OP_implicit_value:
+ {
+ uint64_t 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;
+ ctx->data = op_ptr;
+ ctx->location = DWARF_VALUE_LITERAL;
+ op_ptr += len;
+ dwarf_expr_require_composition (op_ptr, op_end,
+ "DW_OP_implicit_value");
+ }
+ goto no_push;
+
+ case DW_OP_stack_value:
+ ctx->location = DWARF_VALUE_STACK;
+ dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value");
+ goto no_push;
+
+ case DW_OP_GNU_implicit_pointer:
+ {
+ 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 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 = safe_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,
+ "DW_OP_GNU_implicit_pointer");
+ }
break;
case DW_OP_breg0:
@@ -406,26 +920,29 @@ execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
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);
}
break;
case DW_OP_fbreg:
{
- unsigned char *datastart;
+ const gdb_byte *datastart;
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
@@ -434,30 +951,28 @@ execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
/* 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);
- result = dwarf_expr_fetch (ctx, 0);
- if (ctx->in_reg)
- result = (ctx->read_reg) (ctx->baton, result);
+ if (ctx->location == DWARF_VALUE_MEMORY)
+ result = dwarf_expr_fetch_address (ctx, 0);
+ else if (ctx->location == DWARF_VALUE_REGISTER)
+ result = (ctx->funcs->read_addr_from_reg)
+ (ctx->baton,
+ value_as_long (dwarf_expr_fetch (ctx, 0)));
else
- {
- char *buf = alloca (TARGET_ADDR_BIT / TARGET_CHAR_BIT);
- int bytes_read;
-
- (ctx->read_mem) (ctx->baton, buf, result,
- TARGET_ADDR_BIT / TARGET_CHAR_BIT);
- result = dwarf2_read_address (buf,
- buf + (TARGET_ADDR_BIT
- / TARGET_CHAR_BIT),
- &bytes_read);
- }
+ 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->in_reg = 0;
+ 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_drop:
@@ -466,19 +981,37 @@ execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
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;
+
+ case DW_OP_swap:
+ {
+ struct dwarf_stack_value t1, t2;
+
+ if (ctx->stack_len < 2)
+ error (_("Not enough elements for "
+ "DW_OP_swap. Need 2, have %d."),
+ ctx->stack_len);
+ t1 = ctx->stack[ctx->stack_len - 1];
+ t2 = ctx->stack[ctx->stack_len - 2];
+ ctx->stack[ctx->stack_len - 1] = t2;
+ ctx->stack[ctx->stack_len - 2] = t1;
+ goto no_push;
+ }
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;
case DW_OP_rot:
{
- CORE_ADDR t1, t2, t3;
+ struct dwarf_stack_value t1, t2, t3;
if (ctx->stack_len < 3)
- error ("Not enough elements for DW_OP_rot. Need 3, have %d\n",
+ 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];
@@ -491,58 +1024,76 @@ execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
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);
+
+ if (op == DW_OP_GNU_deref_type)
+ {
+ cu_offset 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->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_abs:
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);
-
- switch (op)
- {
- case DW_OP_deref:
- {
- char *buf = alloca (TARGET_ADDR_BIT / TARGET_CHAR_BIT);
- int bytes_read;
-
- (ctx->read_mem) (ctx->baton, buf, result,
- TARGET_ADDR_BIT / TARGET_CHAR_BIT);
- result = dwarf2_read_address (buf,
- buf + (TARGET_ADDR_BIT
- / TARGET_CHAR_BIT),
- &bytes_read);
- }
- break;
+ {
+ /* Unary operations. */
+ result_val = dwarf_expr_fetch (ctx, 0);
+ dwarf_expr_pop (ctx);
- case DW_OP_deref_size:
+ switch (op)
{
- char *buf = alloca (TARGET_ADDR_BIT / TARGET_CHAR_BIT);
- int bytes_read;
-
- (ctx->read_mem) (ctx->baton, buf, result, *op_ptr++);
- result = dwarf2_read_address (buf,
- buf + (TARGET_ADDR_BIT
- / TARGET_CHAR_BIT),
- &bytes_read);
+ 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 = safe_read_uleb128 (op_ptr, op_end, ®);
+ result += reg;
+ result_val = value_from_ulongest (address_type, result);
+ break;
}
- break;
-
- case DW_OP_abs:
- if ((signed int) 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;
- }
+ }
break;
case DW_OP_and:
@@ -563,110 +1114,467 @@ execute_stack_op (struct dwarf_expr_context *ctx, unsigned char *op_ptr,
case DW_OP_gt:
case DW_OP_ne:
{
- /* Binary operations. Use the value engine to do computations in
- the right width. */
- CORE_ADDR first, second;
- enum exp_opcode binop;
- struct value *val1, *val2;
+ /* Binary operations. */
+ struct value *first, *second;
second = dwarf_expr_fetch (ctx, 0);
dwarf_expr_pop (ctx);
- first = dwarf_expr_fetch (ctx, 1);
+ first = dwarf_expr_fetch (ctx, 0);
dwarf_expr_pop (ctx);
- val1 = value_from_longest (unsigned_address_type (), first);
- val2 = value_from_longest (unsigned_address_type (), second);
+ if (! base_types_equal_p (value_type (first), value_type (second)))
+ error (_("Incompatible types on DWARF stack"));
switch (op)
{
case DW_OP_and:
- binop = BINOP_BITWISE_AND;
+ 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:
- binop = BINOP_DIV;
+ result_val = value_binop (first, second, BINOP_DIV);
+ break;
case DW_OP_minus:
- binop = BINOP_SUB;
+ result_val = value_binop (first, second, BINOP_SUB);
break;
case DW_OP_mod:
- binop = BINOP_MOD;
+ {
+ 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:
- binop = BINOP_MUL;
+ result_val = value_binop (first, second, BINOP_MUL);
break;
case DW_OP_or:
- binop = BINOP_BITWISE_IOR;
+ 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:
- binop = BINOP_ADD;
+ result_val = value_binop (first, second, BINOP_ADD);
break;
case DW_OP_shl:
- binop = BINOP_LSH;
+ 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:
- binop = BINOP_RSH;
+ 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:
- binop = BINOP_RSH;
- val1 = value_from_longest (signed_address_type (), first);
+ 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:
- binop = BINOP_BITWISE_XOR;
+ 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:
- binop = BINOP_LEQ;
+ /* A <= B is !(B < A). */
+ result = ! value_less (second, first);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_ge:
- binop = BINOP_GEQ;
+ /* A >= B is !(A < B). */
+ result = ! value_less (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_eq:
- binop = BINOP_EQUAL;
+ result = value_equal (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_lt:
- binop = BINOP_LESS;
+ result = value_less (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_gt:
- binop = BINOP_GTR;
+ /* A > B is B < A. */
+ result = value_less (second, first);
+ result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_ne:
- binop = BINOP_NOTEQUAL;
+ result = ! value_equal (first, second);
+ result_val = value_from_ulongest (address_type, result);
break;
default:
internal_error (__FILE__, __LINE__,
- "Can't be reached.");
+ _("Can't be reached."));
}
- result = value_as_long (value_binop (val1, val2, binop));
}
break;
+ case DW_OP_call_frame_cfa:
+ 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:
- result = dwarf_expr_fetch (ctx, 0);
+ /* 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
+ 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 = 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:
- offset = extract_signed_integer (op_ptr, 2);
+ offset = extract_signed_integer (op_ptr, 2, byte_order);
op_ptr += 2;
op_ptr += offset;
goto no_push;
case DW_OP_bra:
- offset = extract_signed_integer (op_ptr, 2);
- 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:
goto no_push;
+ case DW_OP_piece:
+ {
+ uint64_t size;
+
+ /* Record the piece. */
+ 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
+ type. */
+ if (ctx->location != DWARF_VALUE_LITERAL
+ && ctx->location != DWARF_VALUE_OPTIMIZED_OUT)
+ dwarf_expr_pop (ctx);
+ ctx->location = DWARF_VALUE_MEMORY;
+ }
+ goto no_push;
+
+ case DW_OP_bit_piece:
+ {
+ uint64_t size, offset;
+
+ /* Record the piece. */
+ 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
+ type. */
+ if (ctx->location != DWARF_VALUE_LITERAL
+ && ctx->location != DWARF_VALUE_OPTIMIZED_OUT)
+ dwarf_expr_pop (ctx);
+ ctx->location = DWARF_VALUE_MEMORY;
+ }
+ goto no_push;
+
+ case DW_OP_GNU_uninit:
+ if (op_ptr != op_end)
+ error (_("DWARF-2 expression error: DW_OP_GNU_uninit must always "
+ "be the very last op."));
+
+ ctx->initialized = 0;
+ goto no_push;
+
+ case DW_OP_call2:
+ {
+ 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:
+ {
+ 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:
+ {
+ 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:
+ {
+ cu_offset type_die;
+ int n;
+ const gdb_byte *data;
+ struct type *type;
+
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ type_die.cu_off = uoffset;
+ 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:
+ {
+ cu_offset type_die;
+ struct type *type;
+
+ 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_val = ctx->funcs->get_reg_value (ctx->baton, type, reg);
+ }
+ break;
+
+ case DW_OP_GNU_convert:
+ case DW_OP_GNU_reinterpret:
+ {
+ cu_offset type_die;
+ struct type *type;
+
+ op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
+ type_die.cu_off = uoffset;
+
+ 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);
+
+ 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");
+ error (_("Unhandled dwarf expression opcode 0x%x"), op);
}
/* Most things push a result value. */
- dwarf_expr_push (ctx, result);
- 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
+ pointer, then make a pieced value. This is ok because we can't
+ have implicit pointers in contexts where pieces are invalid. */
+ 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);
+}
+
+/* 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, 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)
+{
+ dwarf_arch_cookie
+ = gdbarch_data_register_post_init (dwarf_gdbarch_types_init);
}