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gdb/gdb-parameterref-1of2.patch

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http://sourceware.org/ml/gdb-patches/2012-06/msg00458.html
Subject: [patch 1/2] Generalize call_site.parameter key ("code cleanup")
Hi,
previously parameter could be identified either via DW_OP_reg or via
DW_OP_fbreg (both in DW_AT_location). As [patch 2/2] adds new identification
via DW_AT_abstract_origin generalize this two state deciding into more general
enum.
Thanks,
Jan
gdb/
2012-06-14 Jan Kratochvil <jan.kratochvil@redhat.com>
Code cleanup: Generalize call_site.parameter key.
* dwarf2expr.c (execute_stack_op) <DW_OP_GNU_entry_value>: Remove
variable dwarf_reg. New variable kind_u. Update parameters to
push_dwarf_reg_entry_value.
(ctx_no_push_dwarf_reg_entry_value): Update parameters.
* dwarf2expr.h (enum call_site_parameter_kind)
(union call_site_parameter_u): Forward declarations.
(struct dwarf_expr_context_funcs): Update parameters and their
description for push_dwarf_reg_entry_value.
(ctx_no_push_dwarf_reg_entry_value): Update parameters.
* dwarf2loc.c (call_site_parameter_matches): New function.
(dwarf_expr_reg_to_entry_parameter): Update parameters and their
description. Use call_site_parameter_matches.
(dwarf_expr_push_dwarf_reg_entry_value, value_of_dwarf_reg_entry):
Update parameters and their description.
(value_of_dwarf_block_entry): Remove variables dwarf_reg and fb_offset.
New variable kind_u. Adjust the caller for updated parameters.
(needs_dwarf_reg_entry_value): Update parameters.
* dwarf2read.c (read_call_site_scope): New variable loc. Use it
instead of attr. Update for the changed fields of struct
call_site_parameter.
* gdbtypes.h: Include dwarf2expr.h.
(enum call_site_parameter_kind): New.
(struct call_site.parameter): New field kind. Wrap dwarf_reg and
fb_offset into new union u.
Index: gdb-7.4.50.20120120/gdb/dwarf2expr.c
===================================================================
--- gdb-7.4.50.20120120.orig/gdb/dwarf2expr.c 2012-06-14 08:55:44.000000000 +0200
+++ gdb-7.4.50.20120120/gdb/dwarf2expr.c 2012-06-14 08:59:51.223967311 +0200
@@ -1349,33 +1349,35 @@ execute_stack_op (struct dwarf_expr_cont
case DW_OP_GNU_entry_value:
{
ULONGEST len;
- int dwarf_reg;
CORE_ADDR deref_size;
+ union call_site_parameter_u kind_u;
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)
+ 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;
}
@@ -1532,7 +1534,8 @@ ctx_no_get_base_type (struct dwarf_expr_
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__,
Index: gdb-7.4.50.20120120/gdb/dwarf2expr.h
===================================================================
--- gdb-7.4.50.20120120.orig/gdb/dwarf2expr.h 2012-06-14 08:55:44.000000000 +0200
+++ gdb-7.4.50.20120120/gdb/dwarf2expr.h 2012-06-14 08:55:59.937479777 +0200
@@ -24,6 +24,8 @@
#define DWARF2EXPR_H
struct dwarf_expr_context;
+enum call_site_parameter_kind;
+union call_site_parameter_u;
/* Virtual method table for struct dwarf_expr_context below. */
@@ -63,14 +65,12 @@ struct dwarf_expr_context_funcs
struct type *(*get_base_type) (struct dwarf_expr_context *ctx, size_t die);
/* Push on DWARF stack an entry evaluated for DW_TAG_GNU_call_site's
- DWARF_REG/FB_OFFSET at the caller of specified BATON. If DWARF register
- number DWARF_REG specifying the push_dwarf_reg_entry_value parameter is
- not -1 FB_OFFSET is ignored. Otherwise FB_OFFSET specifies stack
- parameter offset against caller's stack pointer (which equals the callee's
- frame base). If DEREF_SIZE is not -1 then use
- DW_AT_GNU_call_site_data_value instead of DW_AT_GNU_call_site_value. */
+ parameter matching KIND and KIND_U at the caller of specified BATON.
+ If DEREF_SIZE is not -1 then use DW_AT_GNU_call_site_data_value instead of
+ DW_AT_GNU_call_site_value. */
void (*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);
/* Not yet implemented. */
@@ -276,7 +276,8 @@ CORE_ADDR ctx_no_get_tls_address (void *
void ctx_no_dwarf_call (struct dwarf_expr_context *ctx, size_t die_offset);
struct type *ctx_no_get_base_type (struct dwarf_expr_context *ctx, size_t die);
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);
int dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end);
Index: gdb-7.4.50.20120120/gdb/dwarf2loc.c
===================================================================
--- gdb-7.4.50.20120120.orig/gdb/dwarf2loc.c 2012-06-14 08:55:44.000000000 +0200
+++ gdb-7.4.50.20120120/gdb/dwarf2loc.c 2012-06-14 08:55:59.938479774 +0200
@@ -905,16 +905,34 @@ call_site_find_chain (struct gdbarch *gd
return retval;
}
-/* Fetch call_site_parameter from caller matching the parameters. FRAME is for
- callee. See DWARF_REG and FB_OFFSET description at struct
- dwarf_expr_context_funcs->push_dwarf_reg_entry_value.
+/* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */
+
+static int
+call_site_parameter_matches (struct call_site_parameter *parameter,
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u)
+{
+ if (kind == parameter->kind)
+ switch (kind)
+ {
+ case CALL_SITE_PARAMETER_DWARF_REG:
+ return kind_u.dwarf_reg == parameter->u.dwarf_reg;
+ case CALL_SITE_PARAMETER_FB_OFFSET:
+ return kind_u.fb_offset == parameter->u.fb_offset;
+ }
+ return 0;
+}
+
+/* Fetch call_site_parameter from caller matching KIND and KIND_U.
+ FRAME is for callee.
Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR
otherwise. */
static struct call_site_parameter *
-dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, int dwarf_reg,
- CORE_ADDR fb_offset,
+dwarf_expr_reg_to_entry_parameter (struct frame_info *frame,
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u,
struct dwarf2_per_cu_data **per_cu_return)
{
CORE_ADDR func_addr = get_frame_func (frame);
@@ -979,12 +997,7 @@ dwarf_expr_reg_to_entry_parameter (struc
for (iparams = 0; iparams < call_site->parameter_count; iparams++)
{
parameter = &call_site->parameter[iparams];
- if (parameter->dwarf_reg == -1 && dwarf_reg == -1)
- {
- if (parameter->fb_offset == fb_offset)
- break;
- }
- else if (parameter->dwarf_reg == dwarf_reg)
+ if (call_site_parameter_matches (parameter, kind, kind_u))
break;
}
if (iparams == call_site->parameter_count)
@@ -1041,17 +1054,17 @@ dwarf_entry_parameter_to_value (struct c
return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu);
}
-/* Execute call_site_parameter's DWARF block matching DEREF_SIZE for caller of
- the CTX's frame. CTX must be of dwarf_expr_ctx_funcs kind. See DWARF_REG
- and FB_OFFSET description at struct
- dwarf_expr_context_funcs->push_dwarf_reg_entry_value.
+/* Execute DWARF block of call_site_parameter which matches KIND and KIND_U.
+ Choose DEREF_SIZE value of that parameter. Search caller of the CTX's
+ frame. CTX must be of dwarf_expr_ctx_funcs kind.
The CTX caller can be from a different CU - per_cu_dwarf_call implementation
can be more simple as it does not support cross-CU DWARF executions. */
static void
dwarf_expr_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)
{
struct dwarf_expr_baton *debaton;
@@ -1068,7 +1081,7 @@ dwarf_expr_push_dwarf_reg_entry_value (s
frame = debaton->frame;
caller_frame = get_prev_frame (frame);
- parameter = dwarf_expr_reg_to_entry_parameter (frame, dwarf_reg, fb_offset,
+ parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u,
&caller_per_cu);
data_src = deref_size == -1 ? parameter->value : parameter->data_value;
size = deref_size == -1 ? parameter->value_size : parameter->data_value_size;
@@ -1238,17 +1251,17 @@ static const struct lval_funcs entry_dat
entry_data_value_free_closure
};
-/* Read parameter of TYPE at (callee) FRAME's function entry. DWARF_REG and
- FB_OFFSET are used to match DW_AT_location at the caller's
- DW_TAG_GNU_call_site_parameter. See DWARF_REG and FB_OFFSET description at
- struct dwarf_expr_context_funcs->push_dwarf_reg_entry_value.
+/* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U
+ are used to match DW_AT_location at the caller's
+ DW_TAG_GNU_call_site_parameter.
Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it
cannot resolve the parameter for any reason. */
static struct value *
value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame,
- int dwarf_reg, CORE_ADDR fb_offset)
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u)
{
struct type *checked_type = check_typedef (type);
struct type *target_type = TYPE_TARGET_TYPE (checked_type);
@@ -1258,7 +1271,7 @@ value_of_dwarf_reg_entry (struct type *t
struct dwarf2_per_cu_data *caller_per_cu;
CORE_ADDR addr;
- parameter = dwarf_expr_reg_to_entry_parameter (frame, dwarf_reg, fb_offset,
+ parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u,
&caller_per_cu);
outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */,
@@ -1310,15 +1323,16 @@ static struct value *
value_of_dwarf_block_entry (struct type *type, struct frame_info *frame,
const gdb_byte *block, size_t block_len)
{
- int dwarf_reg;
- CORE_ADDR fb_offset;
-
- dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len);
- if (dwarf_reg != -1)
- return value_of_dwarf_reg_entry (type, frame, dwarf_reg, 0 /* unused */);
+ union call_site_parameter_u kind_u;
- if (dwarf_block_to_fb_offset (block, block + block_len, &fb_offset))
- return value_of_dwarf_reg_entry (type, frame, -1, fb_offset);
+ kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len);
+ if (kind_u.dwarf_reg != -1)
+ return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG,
+ kind_u);
+
+ if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset))
+ return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET,
+ kind_u);
/* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message
suppressed during normal operation. The expression can be arbitrary if
@@ -2391,7 +2405,8 @@ needs_frame_dwarf_call (struct dwarf_exp
static void
needs_dwarf_reg_entry_value (struct dwarf_expr_context *ctx,
- int dwarf_reg, CORE_ADDR fb_offset, int deref_size)
+ enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u, int deref_size)
{
struct needs_frame_baton *nf_baton = ctx->baton;
Index: gdb-7.4.50.20120120/gdb/dwarf2read.c
===================================================================
--- gdb-7.4.50.20120120.orig/gdb/dwarf2read.c 2012-06-14 08:55:46.000000000 +0200
+++ gdb-7.4.50.20120120/gdb/dwarf2read.c 2012-06-14 08:58:31.874143194 +0200
@@ -6368,6 +6368,7 @@ read_call_site_scope (struct die_info *d
{
struct dwarf2_locexpr_baton *dlbaton;
struct call_site_parameter *parameter;
+ struct attribute *loc;
if (child_die->tag != DW_TAG_GNU_call_site_parameter)
{
@@ -6381,8 +6382,8 @@ read_call_site_scope (struct die_info *d
/* DW_AT_location specifies the register number. Value of the data
assumed for the register is contained in DW_AT_GNU_call_site_value. */
- attr = dwarf2_attr (child_die, DW_AT_location, cu);
- if (!attr || !attr_form_is_block (attr))
+ loc = dwarf2_attr (child_die, DW_AT_location, cu);
+ if (loc == NULL || !attr_form_is_block (loc))
{
complaint (&symfile_complaints,
_("No DW_FORM_block* DW_AT_location for "
@@ -6390,19 +6391,26 @@ read_call_site_scope (struct die_info *d
child_die->offset, objfile->name);
continue;
}
- parameter->dwarf_reg = dwarf_block_to_dwarf_reg (DW_BLOCK (attr)->data,
- &DW_BLOCK (attr)->data[DW_BLOCK (attr)->size]);
- if (parameter->dwarf_reg == -1
- && !dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (attr)->data,
- &DW_BLOCK (attr)->data[DW_BLOCK (attr)->size],
- &parameter->fb_offset))
+ else
{
- complaint (&symfile_complaints,
- _("Only single DW_OP_reg or DW_OP_fbreg is supported "
- "for DW_FORM_block* DW_AT_location for "
- "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
- child_die->offset, objfile->name);
- continue;
+ parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
+ (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
+ if (parameter->u.dwarf_reg != -1)
+ parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
+ else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
+ &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
+ &parameter->u.fb_offset))
+ parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
+ else
+ {
+ complaint (&symfile_complaints,
+ _("Only single DW_OP_reg or DW_OP_fbreg is supported "
+ "for DW_FORM_block* DW_AT_location is supported for "
+ "DW_TAG_GNU_call_site child DIE 0x%x "
+ "[in module %s]"),
+ child_die->offset, objfile->name);
+ continue;
+ }
}
attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
Index: gdb-7.4.50.20120120/gdb/gdbtypes.h
===================================================================
--- gdb-7.4.50.20120120.orig/gdb/gdbtypes.h 2012-06-14 08:55:45.000000000 +0200
+++ gdb-7.4.50.20120120/gdb/gdbtypes.h 2012-06-14 08:55:59.943479763 +0200
@@ -23,6 +23,7 @@
#define GDBTYPES_H 1
#include "hashtab.h"
+#include "dwarf2expr.h"
/* Forward declarations for prototypes. */
struct field;
@@ -1010,6 +1011,17 @@ struct func_type
struct call_site *tail_call_list;
};
+/* struct call_site_parameter can be referenced in callees by several ways. */
+
+enum call_site_parameter_kind
+{
+ /* Use field call_site_parameter.u.dwarf_reg. */
+ CALL_SITE_PARAMETER_DWARF_REG,
+
+ /* Use field call_site_parameter.u.fb_offset. */
+ CALL_SITE_PARAMETER_FB_OFFSET
+};
+
/* A place where a function gets called from, represented by
DW_TAG_GNU_call_site. It can be looked up from symtab->call_site_htab. */
@@ -1043,15 +1055,19 @@ struct call_site
/* Describe DW_TAG_GNU_call_site's DW_TAG_formal_parameter. */
struct call_site_parameter
{
- /* DW_TAG_formal_parameter's DW_AT_location's DW_OP_regX as DWARF
- register number, for register passed parameters. If -1 then use
- fb_offset. */
- int dwarf_reg;
-
- /* Offset from the callee's frame base, for stack passed parameters.
- This equals offset from the caller's stack pointer. Valid only if
- DWARF_REGNUM is -1. */
- CORE_ADDR fb_offset;
+ ENUM_BITFIELD (call_site_parameter_kind) kind : 2;
+
+ union call_site_parameter_u
+ {
+ /* DW_TAG_formal_parameter's DW_AT_location's DW_OP_regX as DWARF
+ register number, for register passed parameters. */
+ int dwarf_reg;
+
+ /* Offset from the callee's frame base, for stack passed parameters.
+ This equals offset from the caller's stack pointer. */
+ CORE_ADDR fb_offset;
+ }
+ u;
/* DW_TAG_formal_parameter's DW_AT_GNU_call_site_value. It is never
NULL. */
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