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type.c
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type.c
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/*
* This file is part of ltrace.
* Copyright (C) 2011,2012,2013,2015 Petr Machata, Red Hat Inc.
* Copyright (C) 2007,2008 Juan Cespedes
*
* 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 (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <assert.h>
#include <stdlib.h>
#include <limits.h>
#include "type.h"
#include "sysdep.h"
#include "expr.h"
#include "lens.h"
struct arg_type_info *
type_get_simple(enum arg_type type)
{
#define HANDLE(T) { \
static struct arg_type_info t = { T }; \
case T: \
return &t; \
}
switch (type) {
HANDLE(ARGTYPE_VOID)
HANDLE(ARGTYPE_INT)
HANDLE(ARGTYPE_UINT)
HANDLE(ARGTYPE_LONG)
HANDLE(ARGTYPE_ULONG)
HANDLE(ARGTYPE_CHAR)
HANDLE(ARGTYPE_SHORT)
HANDLE(ARGTYPE_USHORT)
HANDLE(ARGTYPE_FLOAT)
HANDLE(ARGTYPE_DOUBLE)
#undef HANDLE
case ARGTYPE_ARRAY:
case ARGTYPE_STRUCT:
case ARGTYPE_POINTER:
assert(!"Not a simple type!");
};
abort();
}
struct arg_type_info *
type_get_voidptr(void)
{
struct arg_type_info *void_info = type_get_simple(ARGTYPE_VOID);
static struct arg_type_info *ret;
if (ret == NULL) {
static struct arg_type_info ptr_info;
type_init_pointer(&ptr_info, void_info, 0);
ret = &ptr_info;
}
return ret;
}
static void
type_init_common(struct arg_type_info *info, enum arg_type type)
{
info->type = type;
info->lens = NULL;
info->own_lens = 0;
}
struct struct_field {
struct arg_type_info *info;
int own_info;
};
void
type_init_struct(struct arg_type_info *info)
{
type_init_common(info, ARGTYPE_STRUCT);
VECT_INIT(&info->u.entries, struct struct_field);
}
int
type_struct_add(struct arg_type_info *info,
struct arg_type_info *field_info, int own)
{
assert(info->type == ARGTYPE_STRUCT);
assert(field_info->type != ARGTYPE_VOID);
struct struct_field field = { field_info, own };
return VECT_PUSHBACK(&info->u.entries, &field);
}
struct arg_type_info *
type_struct_get(struct arg_type_info *info, size_t idx)
{
assert(info->type == ARGTYPE_STRUCT);
return VECT_ELEMENT(&info->u.entries, struct struct_field, idx)->info;
}
size_t
type_struct_size(struct arg_type_info *info)
{
assert(info->type == ARGTYPE_STRUCT);
return vect_size(&info->u.entries);
}
static void
struct_field_dtor(struct struct_field *field, void *data)
{
if (field->own_info) {
type_destroy(field->info);
free(field->info);
}
}
static void
type_struct_destroy(struct arg_type_info *info)
{
VECT_DESTROY(&info->u.entries, struct struct_field,
struct_field_dtor, NULL);
}
static int
layout_struct(struct process *proc, struct arg_type_info *info,
size_t *sizep, size_t *alignmentp, size_t *offsetofp)
{
size_t sz = 0;
size_t max_alignment = 0;
size_t i;
size_t offsetof_field = (size_t)-1;
if (offsetofp != NULL)
offsetof_field = *offsetofp;
assert(info->type == ARGTYPE_STRUCT);
for (i = 0; i < vect_size(&info->u.entries); ++i) {
struct struct_field *field
= VECT_ELEMENT(&info->u.entries,
struct struct_field, i);
size_t alignment = type_alignof(proc, field->info);
if (alignment == (size_t)-1)
return -1;
/* Add padding to SZ to align the next element. */
sz = align(sz, alignment);
if (i == offsetof_field) {
*offsetofp = sz;
if (sizep == NULL && alignmentp == NULL)
return 0;
}
size_t size = type_sizeof(proc, field->info);
if (size == (size_t)-1)
return -1;
sz += size;
if (alignment > max_alignment)
max_alignment = alignment;
}
if (max_alignment > 0)
sz = align(sz, max_alignment);
if (sizep != NULL)
*sizep = sz;
if (alignmentp != NULL)
*alignmentp = max_alignment;
return 0;
}
void
type_init_array(struct arg_type_info *info,
struct arg_type_info *element_info, int own_info,
struct expr_node *length_expr, int own_length)
{
type_init_common(info, ARGTYPE_ARRAY);
info->u.array_info.elt_type = element_info;
info->u.array_info.own_info = own_info;
info->u.array_info.length = length_expr;
info->u.array_info.own_length = own_length;
}
static void
type_array_destroy(struct arg_type_info *info)
{
if (info->u.array_info.own_info) {
type_destroy(info->u.array_info.elt_type);
free(info->u.array_info.elt_type);
}
if (info->u.array_info.own_length) {
expr_destroy(info->u.array_info.length);
free(info->u.array_info.length);
}
}
void
type_init_pointer(struct arg_type_info *info,
struct arg_type_info *pointee_info, int own_info)
{
type_init_common(info, ARGTYPE_POINTER);
info->u.ptr_info.info = pointee_info;
info->u.ptr_info.own_info = own_info;
}
static void
type_pointer_destroy(struct arg_type_info *info)
{
if (info->u.ptr_info.own_info) {
type_destroy(info->u.ptr_info.info);
free(info->u.ptr_info.info);
}
}
void
type_destroy(struct arg_type_info *info)
{
if (info == NULL)
return;
switch (info->type) {
case ARGTYPE_STRUCT:
type_struct_destroy(info);
break;
case ARGTYPE_ARRAY:
type_array_destroy(info);
break;
case ARGTYPE_POINTER:
type_pointer_destroy(info);
break;
case ARGTYPE_VOID:
case ARGTYPE_INT:
case ARGTYPE_UINT:
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
case ARGTYPE_CHAR:
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
case ARGTYPE_FLOAT:
case ARGTYPE_DOUBLE:
break;
}
if (info->own_lens) {
lens_destroy(info->lens);
free(info->lens);
}
}
static int
type_alloc_and_clone(struct arg_type_info **retpp,
struct arg_type_info *info, int own)
{
*retpp = info;
if (own) {
*retpp = malloc(sizeof **retpp);
if (*retpp == NULL || type_clone(*retpp, info) < 0) {
free(*retpp);
return -1;
}
}
return 0;
}
static enum callback_status
clone_struct_add_field(const struct struct_field *field, void *data)
{
struct arg_type_info *retp = data;
struct arg_type_info *info;
if (type_alloc_and_clone(&info, field->info, field->own_info) < 0) {
fail:
if (info != field->info)
free(info);
return CBS_STOP;
}
if (type_struct_add(retp, info, field->own_info) < 0) {
if (field->own_info)
type_destroy(info);
goto fail;
}
return CBS_CONT;
}
int
type_clone(struct arg_type_info *retp, const struct arg_type_info *info)
{
switch (info->type) {
case ARGTYPE_STRUCT:
type_init_struct(retp);
if (VECT_EACH_CST(&info->u.entries, struct struct_field, NULL,
clone_struct_add_field, retp) != NULL) {
type_destroy(retp);
return -1;
}
break;
case ARGTYPE_ARRAY:;
struct arg_type_info *elt_type;
if (type_alloc_and_clone(&elt_type, info->u.array_info.elt_type,
info->u.array_info.own_info) < 0)
return -1;
assert(!info->u.array_info.own_length); // XXXXXXX
type_init_array(retp, elt_type, info->u.array_info.own_info,
info->u.array_info.length,
info->u.array_info.own_length);
break;
case ARGTYPE_POINTER:;
struct arg_type_info *ninfo;
if (type_alloc_and_clone(&ninfo, info->u.ptr_info.info,
info->u.ptr_info.own_info) < 0)
return -1;
type_init_pointer(retp, ninfo, info->u.ptr_info.own_info);
break;
case ARGTYPE_VOID:
case ARGTYPE_INT:
case ARGTYPE_UINT:
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
case ARGTYPE_CHAR:
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
case ARGTYPE_FLOAT:
case ARGTYPE_DOUBLE:
*retp = *info;
break;
}
assert(!info->own_lens);
retp->lens = info->lens;
retp->own_lens = info->own_lens;
return 0;
}
#ifdef ARCH_HAVE_SIZEOF
size_t arch_type_sizeof(struct process *proc, struct arg_type_info *arg);
#else
size_t
arch_type_sizeof(struct process *proc, struct arg_type_info *arg)
{
/* Use default value. */
return (size_t)-2;
}
#endif
#ifdef ARCH_HAVE_ALIGNOF
size_t arch_type_alignof(struct process *proc, struct arg_type_info *arg);
#else
size_t
arch_type_alignof(struct process *proc, struct arg_type_info *arg)
{
/* Use default value. */
return (size_t)-2;
}
#endif
/* We need to support alignments that are not power of two. E.g. long
* double on x86 has alignment of 12. */
size_t
align(size_t sz, size_t alignment)
{
assert(alignment != 0);
if ((sz % alignment) != 0)
sz = ((sz / alignment) + 1) * alignment;
return sz;
}
size_t
type_sizeof(struct process *proc, struct arg_type_info *type)
{
size_t arch_size = arch_type_sizeof(proc, type);
if (arch_size != (size_t)-2)
return arch_size;
switch (type->type) {
size_t size;
case ARGTYPE_CHAR:
return sizeof(char);
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
return sizeof(short);
case ARGTYPE_INT:
case ARGTYPE_UINT:
return sizeof(int);
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
return sizeof(long);
case ARGTYPE_FLOAT:
return sizeof(float);
case ARGTYPE_DOUBLE:
return sizeof(double);
case ARGTYPE_STRUCT:
if (layout_struct(proc, type, &size, NULL, NULL) < 0)
return (size_t)-1;
return size;
case ARGTYPE_POINTER:
return sizeof(void *);
case ARGTYPE_ARRAY:
if (expr_is_compile_constant(type->u.array_info.length)) {
long l;
if (expr_eval_constant(type->u.array_info.length,
&l) < 0)
return -1;
struct arg_type_info *elt_ti
= type->u.array_info.elt_type;
size_t elt_size = type_sizeof(proc, elt_ti);
if (elt_size == (size_t)-1)
return (size_t)-1;
return ((size_t)l) * elt_size;
} else {
/* Flexible arrays don't count into the
* sizeof. */
return 0;
}
case ARGTYPE_VOID:
return 0;
}
abort();
}
#undef alignof
#define alignof(field,st) ((size_t) ((char*) &st.field - (char*) &st))
size_t
type_alignof(struct process *proc, struct arg_type_info *type)
{
size_t arch_alignment = arch_type_alignof(proc, type);
if (arch_alignment != (size_t)-2)
return arch_alignment;
struct { char c; char C; } cC;
struct { char c; short s; } cs;
struct { char c; int i; } ci;
struct { char c; long l; } cl;
struct { char c; void* p; } cp;
struct { char c; float f; } cf;
struct { char c; double d; } cd;
static size_t char_alignment = alignof(C, cC);
static size_t short_alignment = alignof(s, cs);
static size_t int_alignment = alignof(i, ci);
static size_t long_alignment = alignof(l, cl);
static size_t ptr_alignment = alignof(p, cp);
static size_t float_alignment = alignof(f, cf);
static size_t double_alignment = alignof(d, cd);
switch (type->type) {
size_t alignment;
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
return long_alignment;
case ARGTYPE_CHAR:
return char_alignment;
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
return short_alignment;
case ARGTYPE_FLOAT:
return float_alignment;
case ARGTYPE_DOUBLE:
return double_alignment;
case ARGTYPE_POINTER:
return ptr_alignment;
case ARGTYPE_ARRAY:
return type_alignof(proc, type->u.array_info.elt_type);
case ARGTYPE_STRUCT:
if (layout_struct(proc, type, NULL, &alignment, NULL) < 0)
return (size_t)-1;
return alignment;
default:
return int_alignment;
}
}
size_t
type_offsetof(struct process *proc, struct arg_type_info *type, size_t emt)
{
assert(type->type == ARGTYPE_STRUCT
|| type->type == ARGTYPE_ARRAY);
switch (type->type) {
size_t alignment;
size_t size;
case ARGTYPE_ARRAY:
alignment = type_alignof(proc, type->u.array_info.elt_type);
if (alignment == (size_t)-1)
return (size_t)-1;
size = type_sizeof(proc, type->u.array_info.elt_type);
if (size == (size_t)-1)
return (size_t)-1;
return emt * align(size, alignment);
case ARGTYPE_STRUCT:
if (layout_struct(proc, type, NULL, NULL, &emt) < 0)
return (size_t)-1;
return emt;
default:
abort();
}
}
struct arg_type_info *
type_element(struct arg_type_info *info, size_t emt)
{
assert(info->type == ARGTYPE_STRUCT
|| info->type == ARGTYPE_ARRAY);
switch (info->type) {
case ARGTYPE_ARRAY:
return info->u.array_info.elt_type;
case ARGTYPE_STRUCT:
assert(emt < type_struct_size(info));
return type_struct_get(info, emt);
default:
abort();
}
}
size_t
type_aggregate_size(struct arg_type_info *info)
{
assert(info->type == ARGTYPE_STRUCT
|| info->type == ARGTYPE_ARRAY);
switch (info->type) {
long ret;
case ARGTYPE_ARRAY:
if (expr_eval_constant(info->u.array_info.length, &ret) < 0)
return (size_t)-1;
return (size_t)ret;
case ARGTYPE_STRUCT:
return type_struct_size(info);
default:
abort();
}
}
int
type_is_integral(enum arg_type type)
{
switch (type) {
case ARGTYPE_INT:
case ARGTYPE_UINT:
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
case ARGTYPE_CHAR:
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
return 1;
case ARGTYPE_VOID:
case ARGTYPE_FLOAT:
case ARGTYPE_DOUBLE:
case ARGTYPE_ARRAY:
case ARGTYPE_STRUCT:
case ARGTYPE_POINTER:
return 0;
}
abort();
}
int
type_is_signed(enum arg_type type)
{
assert(type_is_integral(type));
switch (type) {
case ARGTYPE_CHAR:
return CHAR_MIN != 0;
case ARGTYPE_SHORT:
case ARGTYPE_INT:
case ARGTYPE_LONG:
return 1;
case ARGTYPE_UINT:
case ARGTYPE_ULONG:
case ARGTYPE_USHORT:
return 0;
case ARGTYPE_VOID:
case ARGTYPE_FLOAT:
case ARGTYPE_DOUBLE:
case ARGTYPE_ARRAY:
case ARGTYPE_STRUCT:
case ARGTYPE_POINTER:
abort();
}
abort();
}
struct arg_type_info *
type_get_fp_equivalent(struct arg_type_info *info)
{
/* Extract innermost structure. Give up early if any
* component has more than one element. */
while (info->type == ARGTYPE_STRUCT) {
if (type_struct_size(info) != 1)
return NULL;
info = type_element(info, 0);
}
switch (info->type) {
case ARGTYPE_CHAR:
case ARGTYPE_SHORT:
case ARGTYPE_INT:
case ARGTYPE_LONG:
case ARGTYPE_UINT:
case ARGTYPE_ULONG:
case ARGTYPE_USHORT:
case ARGTYPE_VOID:
case ARGTYPE_ARRAY:
case ARGTYPE_POINTER:
return NULL;
case ARGTYPE_FLOAT:
case ARGTYPE_DOUBLE:
return info;
case ARGTYPE_STRUCT:
abort();
}
abort();
}
struct arg_type_info *
type_get_hfa_type(struct arg_type_info *info, size_t *countp)
{
assert(info != NULL);
if (info->type != ARGTYPE_STRUCT
&& info->type != ARGTYPE_ARRAY)
return NULL;
size_t n = type_aggregate_size(info);
if (n == (size_t)-1)
return NULL;
struct arg_type_info *ret = NULL;
*countp = 0;
while (n-- > 0) {
struct arg_type_info *emt = type_element(info, n);
size_t emt_count = 1;
if (emt->type == ARGTYPE_STRUCT || emt->type == ARGTYPE_ARRAY)
emt = type_get_hfa_type(emt, &emt_count);
if (emt == NULL)
return NULL;
if (ret == NULL) {
if (emt->type != ARGTYPE_FLOAT
&& emt->type != ARGTYPE_DOUBLE)
return NULL;
ret = emt;
}
if (emt->type != ret->type)
return NULL;
*countp += emt_count;
}
return ret;
}