mirror of
https://github.com/JakeHillion/drgn.git
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190062f470
Getting the bit field size of a member will soon require evaluating the lazy type, so return it from drgn_member_type() instead of accessing it directly. Signed-off-by: Omar Sandoval <osandov@osandov.com>
2433 lines
64 KiB
C
2433 lines
64 KiB
C
// Copyright (c) Facebook, Inc. and its affiliates.
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// SPDX-License-Identifier: GPL-3.0+
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#include <assert.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <string.h>
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#include "drgn.h"
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#include "error.h"
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#include "language.h"
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#include "memory_reader.h"
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#include "minmax.h"
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#include "object.h"
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#include "program.h"
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#include "serialize.h"
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#include "type.h"
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#include "util.h"
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LIBDRGN_PUBLIC void drgn_object_init(struct drgn_object *obj,
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struct drgn_program *prog)
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{
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obj->type = drgn_void_type(prog, NULL);
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obj->bit_size = 0;
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obj->qualifiers = 0;
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obj->encoding = DRGN_OBJECT_ENCODING_NONE;
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obj->kind = DRGN_OBJECT_ABSENT;
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obj->is_bit_field = false;
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}
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static void drgn_value_deinit(const struct drgn_object *obj,
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const union drgn_value *value)
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{
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if (obj->encoding == DRGN_OBJECT_ENCODING_BUFFER &&
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!drgn_object_is_inline(obj))
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free(value->bufp);
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}
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LIBDRGN_PUBLIC void drgn_object_deinit_value(const struct drgn_object *obj,
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const union drgn_value *value)
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{
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if (value != &obj->value)
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drgn_value_deinit(obj, value);
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}
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LIBDRGN_PUBLIC void drgn_object_deinit(struct drgn_object *obj)
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{
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if (obj->kind == DRGN_OBJECT_VALUE)
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drgn_value_deinit(obj, &obj->value);
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}
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/* Copy everything from src to dst but the program, kind, and value. */
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static inline void drgn_object_reinit_copy(struct drgn_object *dst,
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const struct drgn_object *src)
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{
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drgn_object_deinit(dst);
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dst->type = src->type;
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dst->qualifiers = src->qualifiers;
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dst->encoding = src->encoding;
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dst->bit_size = src->bit_size;
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dst->is_bit_field = src->is_bit_field;
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}
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struct drgn_error *
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drgn_object_type_encoding_and_size(const struct drgn_object_type *type,
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enum drgn_object_encoding *encoding_ret,
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uint64_t *bit_size_ret)
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{
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struct drgn_error *err;
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bool is_complete;
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*encoding_ret = drgn_type_object_encoding(type->underlying_type);
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is_complete = drgn_object_encoding_is_complete(*encoding_ret);
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if (is_complete) {
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err = drgn_type_bit_size(type->underlying_type, bit_size_ret);
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if (err)
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return err;
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} else {
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*bit_size_ret = 0;
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}
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if (type->bit_field_size) {
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if (is_complete && type->bit_field_size > *bit_size_ret) {
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return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
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"bit field size is larger than type size");
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}
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*bit_size_ret = type->bit_field_size;
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}
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return NULL;
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}
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struct drgn_error *
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drgn_object_set_common(struct drgn_qualified_type qualified_type,
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uint64_t bit_field_size,
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struct drgn_object_type *type_ret,
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enum drgn_object_encoding *encoding_ret,
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uint64_t *bit_size_ret)
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{
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type_ret->type = qualified_type.type;
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type_ret->qualifiers = qualified_type.qualifiers;
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type_ret->underlying_type = drgn_underlying_type(qualified_type.type);
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type_ret->bit_field_size = bit_field_size;
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return drgn_object_type_encoding_and_size(type_ret, encoding_ret,
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bit_size_ret);
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}
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struct drgn_error *
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drgn_object_set_signed_internal(struct drgn_object *res,
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const struct drgn_object_type *type,
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uint64_t bit_size, int64_t svalue)
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{
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if (bit_size == 0 || bit_size > 64) {
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return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
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"unsupported integer bit size (%" PRIu64 ")",
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bit_size);
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}
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drgn_object_reinit(res, type, DRGN_OBJECT_ENCODING_SIGNED, bit_size,
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DRGN_OBJECT_VALUE);
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res->value.svalue = truncate_signed(svalue, bit_size);
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return NULL;
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}
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LIBDRGN_PUBLIC struct drgn_error *
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drgn_object_set_signed(struct drgn_object *res,
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struct drgn_qualified_type qualified_type,
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int64_t svalue, uint64_t bit_field_size)
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{
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struct drgn_error *err;
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struct drgn_object_type type;
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enum drgn_object_encoding encoding;
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uint64_t bit_size;
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err = drgn_object_set_common(qualified_type, bit_field_size, &type,
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&encoding, &bit_size);
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if (err)
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return err;
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if (encoding != DRGN_OBJECT_ENCODING_SIGNED) {
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return drgn_error_create(DRGN_ERROR_TYPE,
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"not a signed integer type");
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}
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return drgn_object_set_signed_internal(res, &type, bit_size, svalue);
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}
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struct drgn_error *
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drgn_object_set_unsigned_internal(struct drgn_object *res,
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const struct drgn_object_type *type,
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uint64_t bit_size, uint64_t uvalue)
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{
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if (bit_size == 0 || bit_size > 64) {
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return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
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"unsupported integer bit size (%" PRIu64 ")",
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bit_size);
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}
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drgn_object_reinit(res, type, DRGN_OBJECT_ENCODING_UNSIGNED, bit_size,
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DRGN_OBJECT_VALUE);
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res->value.uvalue = truncate_unsigned(uvalue, bit_size);
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return NULL;
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}
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LIBDRGN_PUBLIC struct drgn_error *
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drgn_object_set_unsigned(struct drgn_object *res,
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struct drgn_qualified_type qualified_type,
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uint64_t uvalue, uint64_t bit_field_size)
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{
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struct drgn_error *err;
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struct drgn_object_type type;
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enum drgn_object_encoding encoding;
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uint64_t bit_size;
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err = drgn_object_set_common(qualified_type, bit_field_size, &type,
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&encoding, &bit_size);
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if (err)
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return err;
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if (encoding != DRGN_OBJECT_ENCODING_UNSIGNED) {
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return drgn_error_create(DRGN_ERROR_TYPE,
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"not an unsigned integer type");
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}
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return drgn_object_set_unsigned_internal(res, &type, bit_size, uvalue);
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}
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static struct drgn_error *
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drgn_object_set_float_internal(struct drgn_object *res,
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const struct drgn_object_type *type,
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uint64_t bit_size, double fvalue)
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{
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if (bit_size != 32 && bit_size != 64) {
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return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
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"unsupported floating-point bit size (%" PRIu64 ")",
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bit_size);
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}
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drgn_object_reinit(res, type, DRGN_OBJECT_ENCODING_FLOAT, bit_size,
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DRGN_OBJECT_VALUE);
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if (bit_size == 32)
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res->value.fvalue = (float)fvalue;
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else
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res->value.fvalue = fvalue;
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return NULL;
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}
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LIBDRGN_PUBLIC struct drgn_error *
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drgn_object_set_float(struct drgn_object *res,
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struct drgn_qualified_type qualified_type, double fvalue)
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{
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struct drgn_error *err;
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struct drgn_object_type type;
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enum drgn_object_encoding encoding;
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uint64_t bit_size;
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err = drgn_object_set_common(qualified_type, 0, &type, &encoding,
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&bit_size);
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if (err)
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return err;
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if (encoding != DRGN_OBJECT_ENCODING_FLOAT) {
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return drgn_error_create(DRGN_ERROR_TYPE,
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"not a floating-point type");
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}
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return drgn_object_set_float_internal(res, &type, bit_size, fvalue);
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}
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struct drgn_error *sanity_check_object(enum drgn_object_encoding encoding,
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uint64_t bit_field_size,
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uint64_t bit_size)
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{
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if (bit_field_size && encoding != DRGN_OBJECT_ENCODING_SIGNED &&
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encoding != DRGN_OBJECT_ENCODING_UNSIGNED) {
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return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
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"bit field must be integer");
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}
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switch (encoding) {
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case DRGN_OBJECT_ENCODING_SIGNED:
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case DRGN_OBJECT_ENCODING_UNSIGNED:
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if (bit_size == 0 || bit_size > 64) {
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return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
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"unsupported integer bit size (%" PRIu64 ")",
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bit_size);
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}
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return NULL;
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case DRGN_OBJECT_ENCODING_FLOAT:
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if (bit_size != 32 && bit_size != 64) {
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return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
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"unsupported floating-point bit size (%" PRIu64 ")",
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bit_size);
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}
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return NULL;
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default:
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return NULL;
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}
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}
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static void drgn_value_deserialize(union drgn_value *value, const void *buf,
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uint8_t bit_offset,
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enum drgn_object_encoding encoding,
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uint64_t bit_size, bool little_endian)
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{
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union {
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int64_t svalue;
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uint64_t uvalue;
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double fvalue64;
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float fvalue32;
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} tmp;
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tmp.uvalue = deserialize_bits(buf, bit_offset, bit_size, little_endian);
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switch (encoding) {
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case DRGN_OBJECT_ENCODING_SIGNED:
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value->svalue = sign_extend(tmp.svalue, bit_size);
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break;
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case DRGN_OBJECT_ENCODING_UNSIGNED:
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value->uvalue = tmp.uvalue;
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break;
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case DRGN_OBJECT_ENCODING_FLOAT:
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value->fvalue = bit_size == 32 ? tmp.fvalue32 : tmp.fvalue64;
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break;
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default:
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UNREACHABLE();
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}
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}
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struct drgn_error *
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drgn_byte_order_to_little_endian(struct drgn_program *prog,
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enum drgn_byte_order byte_order, bool *ret)
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{
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SWITCH_ENUM_DEFAULT(byte_order,
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case DRGN_BIG_ENDIAN:
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*ret = false;
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return NULL;
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case DRGN_LITTLE_ENDIAN:
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*ret = true;
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return NULL;
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case DRGN_PROGRAM_ENDIAN:
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return drgn_program_is_little_endian(prog, ret);
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default:
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return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
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"invalid byte order");
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)
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}
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static void copy_bits(void *dst, const void *src, unsigned int bit_offset,
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uint64_t bit_size, bool little_endian)
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{
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unsigned char *d = dst;
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const unsigned char *s = src;
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size_t bytes = bit_size / CHAR_BIT;
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unsigned int bits = bit_size % CHAR_BIT;
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if (little_endian) {
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if (bit_offset) {
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for (size_t i = 0; i < bytes; i++) {
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d[i] = ((s[i] >> bit_offset) |
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(s[i + 1] << (CHAR_BIT - bit_offset)));
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}
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} else if (d != s) {
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memcpy(d, s, bytes);
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}
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if (bits) {
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unsigned char c = s[bytes] >> bit_offset;
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if (bits > CHAR_BIT - bit_offset)
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c |= s[bytes + 1] << (CHAR_BIT - bit_offset);
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d[bytes] = c & ((1U << bits) - 1);
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}
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} else {
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if (bit_offset) {
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for (size_t i = 0; i < bytes; i++) {
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d[i] = ((s[i] << bit_offset) |
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(s[i + 1] >> (CHAR_BIT - bit_offset)));
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}
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} else if (d != s) {
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memcpy(d, s, bytes);
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}
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if (bits) {
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unsigned char c = s[bytes] << bit_offset;
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if (bits > CHAR_BIT - bit_offset)
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c |= s[bytes + 1] >> (CHAR_BIT - bit_offset);
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d[bytes] = c & (-1U << (CHAR_BIT - bits));
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}
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}
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}
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struct drgn_error *
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drgn_object_set_from_buffer_internal(struct drgn_object *res,
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const struct drgn_object_type *type,
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enum drgn_object_encoding encoding,
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uint64_t bit_size, const void *buf,
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uint64_t bit_offset, bool little_endian)
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{
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struct drgn_error *err;
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if (!drgn_object_encoding_is_complete(encoding)) {
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return drgn_error_incomplete_type("cannot create object with %s type",
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type->type);
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}
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err = sanity_check_object(encoding, type->bit_field_size, bit_size);
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if (err)
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return err;
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const char *p = (const char *)buf + (bit_offset / CHAR_BIT);
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bit_offset %= CHAR_BIT;
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if (encoding == DRGN_OBJECT_ENCODING_BUFFER) {
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/*
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* `buf` may point inside of `drgn_object_buffer(res)`, so copy
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* to a temporary value before freeing or modifying the latter.
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*/
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union drgn_value value;
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uint64_t size = drgn_value_size(bit_size);
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char *dst;
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if (size <= sizeof(res->value.ibuf)) {
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dst = value.ibuf;
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} else {
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dst = malloc64(size);
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if (!dst)
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return &drgn_enomem;
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value.bufp = dst;
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}
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copy_bits(dst, p, bit_offset, bit_size, little_endian);
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drgn_object_reinit(res, type, DRGN_OBJECT_ENCODING_BUFFER,
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bit_size, DRGN_OBJECT_VALUE);
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res->value = value;
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res->little_endian = little_endian;
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} else {
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drgn_object_reinit(res, type, encoding, bit_size,
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DRGN_OBJECT_VALUE);
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drgn_value_deserialize(&res->value, p, bit_offset, encoding,
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bit_size, little_endian);
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}
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return NULL;
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}
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LIBDRGN_PUBLIC struct drgn_error *
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drgn_object_set_from_buffer(struct drgn_object *res,
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struct drgn_qualified_type qualified_type,
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const void *buf, size_t buf_size,
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uint64_t bit_offset, uint64_t bit_field_size,
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enum drgn_byte_order byte_order)
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{
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struct drgn_error *err;
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bool little_endian;
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err = drgn_byte_order_to_little_endian(drgn_object_program(res),
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byte_order, &little_endian);
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if (err)
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return err;
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struct drgn_object_type type;
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enum drgn_object_encoding encoding;
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uint64_t bit_size;
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err = drgn_object_set_common(qualified_type, bit_field_size, &type,
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&encoding, &bit_size);
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if (err)
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return err;
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if (bit_size > UINT64_MAX - bit_offset ||
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buf_size < drgn_value_size(bit_offset + bit_size)) {
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return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
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"buffer is too small");
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}
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return drgn_object_set_from_buffer_internal(res, &type, encoding,
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bit_size, buf, bit_offset,
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little_endian);
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}
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static struct drgn_error *
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drgn_object_set_reference_internal(struct drgn_object *res,
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const struct drgn_object_type *type,
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enum drgn_object_encoding encoding,
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uint64_t bit_size, uint64_t address,
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uint64_t bit_offset, bool little_endian)
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{
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bool is_64_bit;
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struct drgn_error *err =
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drgn_program_is_64_bit(drgn_object_program(res), &is_64_bit);
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if (err)
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return err;
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err = sanity_check_object(encoding, type->bit_field_size, bit_size);
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if (err)
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return err;
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address += bit_offset / 8;
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address &= is_64_bit ? UINT64_MAX : UINT32_MAX;
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bit_offset %= 8;
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if (bit_size > UINT64_MAX - bit_offset) {
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return drgn_error_format(DRGN_ERROR_OVERFLOW,
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"object is too large");
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}
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drgn_object_reinit(res, type, encoding, bit_size,
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DRGN_OBJECT_REFERENCE);
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res->address = address;
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res->bit_offset = bit_offset;
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res->little_endian = little_endian;
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return NULL;
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}
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LIBDRGN_PUBLIC struct drgn_error *
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drgn_object_set_reference(struct drgn_object *res,
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struct drgn_qualified_type qualified_type,
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uint64_t address, uint64_t bit_offset,
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uint64_t bit_field_size,
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enum drgn_byte_order byte_order)
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{
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struct drgn_error *err;
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bool little_endian;
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struct drgn_object_type type;
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enum drgn_object_encoding encoding;
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uint64_t bit_size;
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err = drgn_byte_order_to_little_endian(drgn_object_program(res),
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byte_order, &little_endian);
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if (err)
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return err;
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err = drgn_object_set_common(qualified_type, bit_field_size, &type,
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&encoding, &bit_size);
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if (err)
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return err;
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return drgn_object_set_reference_internal(res, &type, encoding, bit_size,
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address, bit_offset,
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little_endian);
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}
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LIBDRGN_PUBLIC struct drgn_error *
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drgn_object_set_absent(struct drgn_object *res,
|
|
struct drgn_qualified_type qualified_type,
|
|
uint64_t bit_field_size)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_object_type type;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
err = drgn_object_set_common(qualified_type, bit_field_size, &type,
|
|
&encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
err = sanity_check_object(encoding, type.bit_field_size, bit_size);
|
|
if (err)
|
|
return err;
|
|
drgn_object_reinit(res, &type, encoding, bit_size,
|
|
DRGN_OBJECT_ABSENT);
|
|
return NULL;
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_copy(struct drgn_object *res, const struct drgn_object *obj)
|
|
{
|
|
if (res == obj)
|
|
return NULL;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
SWITCH_ENUM(obj->kind,
|
|
case DRGN_OBJECT_VALUE:
|
|
if (obj->encoding == DRGN_OBJECT_ENCODING_BUFFER) {
|
|
size_t size = drgn_object_size(obj);
|
|
char *dst;
|
|
const char *src;
|
|
if (size <= sizeof(obj->value.ibuf)) {
|
|
dst = res->value.ibuf;
|
|
src = obj->value.ibuf;
|
|
} else {
|
|
dst = malloc(size);
|
|
if (!dst)
|
|
return &drgn_enomem;
|
|
src = obj->value.bufp;
|
|
}
|
|
drgn_object_reinit_copy(res, obj);
|
|
res->kind = DRGN_OBJECT_VALUE;
|
|
memcpy(dst, src, size);
|
|
if (dst != res->value.ibuf)
|
|
res->value.bufp = dst;
|
|
res->little_endian = obj->little_endian;
|
|
} else {
|
|
drgn_object_reinit_copy(res, obj);
|
|
res->kind = DRGN_OBJECT_VALUE;
|
|
res->value = obj->value;
|
|
}
|
|
break;
|
|
case DRGN_OBJECT_REFERENCE:
|
|
drgn_object_reinit_copy(res, obj);
|
|
res->kind = DRGN_OBJECT_REFERENCE;
|
|
res->address = obj->address;
|
|
res->bit_offset = obj->bit_offset;
|
|
res->little_endian = obj->little_endian;
|
|
break;
|
|
case DRGN_OBJECT_ABSENT:
|
|
drgn_object_reinit_copy(res, obj);
|
|
res->kind = DRGN_OBJECT_ABSENT;
|
|
break;
|
|
)
|
|
return NULL;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_slice_internal(struct drgn_object *res,
|
|
const struct drgn_object *obj,
|
|
struct drgn_object_type *type,
|
|
enum drgn_object_encoding encoding,
|
|
uint64_t bit_size, uint64_t bit_offset)
|
|
{
|
|
SWITCH_ENUM(obj->kind,
|
|
case DRGN_OBJECT_VALUE: {
|
|
if (obj->encoding != DRGN_OBJECT_ENCODING_BUFFER) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"not a buffer object");
|
|
}
|
|
|
|
uint64_t bit_end;
|
|
if (__builtin_add_overflow(bit_offset, bit_size, &bit_end) ||
|
|
bit_end > obj->bit_size) {
|
|
return drgn_error_create(DRGN_ERROR_OUT_OF_BOUNDS,
|
|
"out of bounds of value");
|
|
}
|
|
return drgn_object_set_from_buffer_internal(res, type, encoding,
|
|
bit_size,
|
|
drgn_object_buffer(obj),
|
|
bit_offset,
|
|
obj->little_endian);
|
|
}
|
|
case DRGN_OBJECT_REFERENCE:
|
|
if (obj->encoding != DRGN_OBJECT_ENCODING_BUFFER &&
|
|
obj->encoding != DRGN_OBJECT_ENCODING_INCOMPLETE_BUFFER) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"not a buffer object");
|
|
}
|
|
|
|
return drgn_object_set_reference_internal(res, type, encoding,
|
|
bit_size,
|
|
obj->address,
|
|
bit_offset,
|
|
obj->little_endian);
|
|
case DRGN_OBJECT_ABSENT:
|
|
return &drgn_error_object_absent;
|
|
)
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_slice(struct drgn_object *res, const struct drgn_object *obj,
|
|
struct drgn_qualified_type qualified_type,
|
|
uint64_t bit_offset, uint64_t bit_field_size)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_object_type type;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
err = drgn_object_set_common(qualified_type, bit_field_size, &type,
|
|
&encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
return drgn_object_slice_internal(res, obj, &type, encoding, bit_size,
|
|
bit_offset);
|
|
}
|
|
|
|
struct drgn_error *
|
|
drgn_object_dereference_offset(struct drgn_object *res,
|
|
const struct drgn_object *obj,
|
|
struct drgn_qualified_type qualified_type,
|
|
int64_t bit_offset, uint64_t bit_field_size)
|
|
{
|
|
struct drgn_error *err;
|
|
uint64_t address;
|
|
|
|
err = drgn_object_read_unsigned(obj, &address);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* / and % truncate towards 0. Here, we want to truncate towards
|
|
* negative infinity. We can accomplish that by replacing "/ 8" with an
|
|
* arithmetic shift ">> 3" and "% 8" with "& 7".
|
|
*/
|
|
address += bit_offset >> 3;
|
|
bit_offset &= 7;
|
|
return drgn_object_set_reference(res, qualified_type, address,
|
|
bit_offset, bit_field_size,
|
|
DRGN_PROGRAM_ENDIAN);
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_read_reference(const struct drgn_object *obj,
|
|
union drgn_value *value)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
assert(obj->kind == DRGN_OBJECT_REFERENCE);
|
|
|
|
if (!drgn_object_encoding_is_complete(obj->encoding)) {
|
|
return drgn_error_incomplete_type("cannot read object with %s type",
|
|
obj->type);
|
|
}
|
|
|
|
uint64_t bit_size = obj->bit_size;
|
|
uint8_t bit_offset = obj->bit_offset;
|
|
uint64_t read_size;
|
|
if (bit_offset == 0)
|
|
read_size = drgn_object_size(obj);
|
|
else
|
|
read_size = drgn_value_size(bit_offset + bit_size);
|
|
|
|
if (obj->encoding == DRGN_OBJECT_ENCODING_BUFFER) {
|
|
char ibuf_offset[sizeof(value->ibuf) + 1];
|
|
char *buf, *read_buf;
|
|
if (read_size <= sizeof(value->ibuf)) {
|
|
buf = read_buf = value->ibuf;
|
|
} else if (drgn_object_is_inline(obj)) {
|
|
/*
|
|
* The value fits inside of the inline buffer, but it is
|
|
* offset, so we need to read an additional byte. Read
|
|
* it into an on-stack buffer first.
|
|
*/
|
|
buf = value->ibuf;
|
|
read_buf = ibuf_offset;
|
|
} else {
|
|
buf = read_buf = malloc64(read_size);
|
|
if (!buf)
|
|
return &drgn_enomem;
|
|
}
|
|
err = drgn_memory_reader_read(&drgn_object_program(obj)->reader,
|
|
read_buf, obj->address, read_size,
|
|
false);
|
|
if (err) {
|
|
if (buf != value->ibuf)
|
|
free(buf);
|
|
return err;
|
|
}
|
|
copy_bits(buf, read_buf, bit_offset, bit_size,
|
|
obj->little_endian);
|
|
if (buf != value->ibuf)
|
|
value->bufp = buf;
|
|
return NULL;
|
|
} else {
|
|
char buf[9];
|
|
assert(read_size <= sizeof(buf));
|
|
err = drgn_memory_reader_read(&drgn_object_program(obj)->reader,
|
|
buf, obj->address, read_size,
|
|
false);
|
|
if (err)
|
|
return err;
|
|
drgn_value_deserialize(value, buf, bit_offset, obj->encoding,
|
|
bit_size, obj->little_endian);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_read(struct drgn_object *res, const struct drgn_object *obj)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
SWITCH_ENUM(obj->kind,
|
|
case DRGN_OBJECT_VALUE:
|
|
return drgn_object_copy(res, obj);
|
|
case DRGN_OBJECT_REFERENCE: {
|
|
union drgn_value value;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
err = drgn_object_read_reference(obj, &value);
|
|
if (err)
|
|
return err;
|
|
drgn_object_reinit_copy(res, obj);
|
|
res->kind = DRGN_OBJECT_VALUE;
|
|
res->value = value;
|
|
res->little_endian = obj->little_endian;
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_ABSENT:
|
|
return &drgn_error_object_absent;
|
|
)
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_read_value(const struct drgn_object *obj, union drgn_value *value,
|
|
const union drgn_value **ret)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
SWITCH_ENUM(obj->kind,
|
|
case DRGN_OBJECT_VALUE:
|
|
*ret = &obj->value;
|
|
return NULL;
|
|
case DRGN_OBJECT_REFERENCE:
|
|
err = drgn_object_read_reference(obj, value);
|
|
if (!err)
|
|
*ret = value;
|
|
return err;
|
|
case DRGN_OBJECT_ABSENT:
|
|
return &drgn_error_object_absent;
|
|
)
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_value_signed(const struct drgn_object *obj, int64_t *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
union drgn_value value_mem;
|
|
const union drgn_value *value;
|
|
|
|
assert(obj->encoding == DRGN_OBJECT_ENCODING_SIGNED);
|
|
|
|
err = drgn_object_read_value(obj, &value_mem, &value);
|
|
if (err)
|
|
return err;
|
|
*ret = value->svalue;
|
|
drgn_object_deinit_value(obj, value);
|
|
return err;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_value_unsigned(const struct drgn_object *obj, uint64_t *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
union drgn_value value_mem;
|
|
const union drgn_value *value;
|
|
|
|
assert(obj->encoding == DRGN_OBJECT_ENCODING_UNSIGNED);
|
|
|
|
err = drgn_object_read_value(obj, &value_mem, &value);
|
|
if (err)
|
|
return err;
|
|
*ret = value->uvalue;
|
|
drgn_object_deinit_value(obj, value);
|
|
return err;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_value_float(const struct drgn_object *obj, double *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
union drgn_value value_mem;
|
|
const union drgn_value *value;
|
|
|
|
assert(obj->encoding == DRGN_OBJECT_ENCODING_FLOAT);
|
|
|
|
err = drgn_object_read_value(obj, &value_mem, &value);
|
|
if (err)
|
|
return err;
|
|
*ret = value->fvalue;
|
|
drgn_object_deinit_value(obj, value);
|
|
return err;
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_read_signed(const struct drgn_object *obj, int64_t *ret)
|
|
{
|
|
if (obj->encoding != DRGN_OBJECT_ENCODING_SIGNED) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"not a signed integer");
|
|
}
|
|
return drgn_object_value_signed(obj, ret);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_read_unsigned(const struct drgn_object *obj, uint64_t *ret)
|
|
{
|
|
if (obj->encoding != DRGN_OBJECT_ENCODING_UNSIGNED) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"not an unsigned integer");
|
|
}
|
|
return drgn_object_value_unsigned(obj, ret);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_read_integer(const struct drgn_object *obj, union drgn_value *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
union drgn_value value_mem;
|
|
const union drgn_value *value;
|
|
|
|
if (obj->encoding != DRGN_OBJECT_ENCODING_SIGNED &&
|
|
obj->encoding != DRGN_OBJECT_ENCODING_UNSIGNED) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"not an integer");
|
|
}
|
|
err = drgn_object_read_value(obj, &value_mem, &value);
|
|
if (err)
|
|
return err;
|
|
*ret = *value;
|
|
drgn_object_deinit_value(obj, value);
|
|
return NULL;
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_read_float(const struct drgn_object *obj, double *ret)
|
|
{
|
|
if (obj->encoding != DRGN_OBJECT_ENCODING_FLOAT) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"not floating-point");
|
|
}
|
|
return drgn_object_value_float(obj, ret);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_read_c_string(const struct drgn_object *obj, char **ret)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_type *underlying_type;
|
|
uint64_t address;
|
|
size_t max_size;
|
|
|
|
underlying_type = drgn_underlying_type(obj->type);
|
|
switch (drgn_type_kind(underlying_type)) {
|
|
case DRGN_TYPE_POINTER:
|
|
err = drgn_object_value_unsigned(obj, &address);
|
|
if (err)
|
|
return err;
|
|
max_size = SIZE_MAX;
|
|
break;
|
|
case DRGN_TYPE_ARRAY:
|
|
if (drgn_type_is_complete(underlying_type)) {
|
|
uint64_t size;
|
|
|
|
err = drgn_type_sizeof(underlying_type, &size);
|
|
if (err)
|
|
return err;
|
|
max_size = min(size, (uint64_t)SIZE_MAX);
|
|
} else {
|
|
max_size = SIZE_MAX;
|
|
}
|
|
SWITCH_ENUM(obj->kind,
|
|
case DRGN_OBJECT_VALUE: {
|
|
const char *buf;
|
|
uint64_t value_size;
|
|
size_t len;
|
|
char *p, *str;
|
|
|
|
buf = drgn_object_buffer(obj);
|
|
value_size = drgn_object_size(obj);
|
|
len = min(value_size, (uint64_t)max_size);
|
|
p = memchr(buf, 0, len);
|
|
if (p)
|
|
len = p - buf;
|
|
str = malloc(len + 1);
|
|
if (!str)
|
|
return &drgn_enomem;
|
|
memcpy(str, buf, len);
|
|
str[len] = '\0';
|
|
*ret = str;
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_REFERENCE:
|
|
address = obj->address;
|
|
break;
|
|
case DRGN_OBJECT_ABSENT:
|
|
return &drgn_error_object_absent;
|
|
)
|
|
break;
|
|
default:
|
|
return drgn_type_error("string() argument must be an array or pointer, not '%s'",
|
|
obj->type);
|
|
}
|
|
|
|
return drgn_program_read_c_string(drgn_object_program(obj), address,
|
|
false, max_size, ret);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_format_object(const struct drgn_object *obj, size_t columns,
|
|
enum drgn_format_object_flags flags, char **ret)
|
|
{
|
|
const struct drgn_language *lang = drgn_object_language(obj);
|
|
|
|
if (flags & ~DRGN_FORMAT_OBJECT_VALID_FLAGS) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"invalid format object flags");
|
|
}
|
|
return lang->format_object(obj, columns, flags, ret);
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_convert_signed(const struct drgn_object *obj, uint64_t bit_size,
|
|
int64_t *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
union drgn_value value_mem;
|
|
const union drgn_value *value;
|
|
|
|
err = drgn_object_read_value(obj, &value_mem, &value);
|
|
if (err)
|
|
return err;
|
|
switch (obj->encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED:
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
*ret = truncate_signed(value->svalue, bit_size);
|
|
break;
|
|
case DRGN_OBJECT_ENCODING_FLOAT:
|
|
*ret = truncate_signed(value->fvalue, bit_size);
|
|
break;
|
|
default:
|
|
err = drgn_error_create(DRGN_ERROR_TYPE,
|
|
"object cannot be converted to integer");
|
|
break;
|
|
}
|
|
drgn_object_deinit_value(obj, value);
|
|
return err;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_convert_unsigned(const struct drgn_object *obj, uint64_t bit_size,
|
|
uint64_t *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
union drgn_value value_mem;
|
|
const union drgn_value *value;
|
|
|
|
err = drgn_object_read_value(obj, &value_mem, &value);
|
|
if (err)
|
|
return err;
|
|
switch (obj->encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED:
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
*ret = truncate_unsigned(value->uvalue, bit_size);
|
|
break;
|
|
case DRGN_OBJECT_ENCODING_FLOAT:
|
|
*ret = truncate_unsigned(value->fvalue, bit_size);
|
|
break;
|
|
default:
|
|
err = drgn_error_create(DRGN_ERROR_TYPE,
|
|
"object cannot be converted to integer");
|
|
break;
|
|
}
|
|
drgn_object_deinit_value(obj, value);
|
|
return err;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_convert_float(const struct drgn_object *obj, double *fvalue)
|
|
{
|
|
struct drgn_error *err;
|
|
union drgn_value value_mem;
|
|
const union drgn_value *value;
|
|
|
|
err = drgn_object_read_value(obj, &value_mem, &value);
|
|
if (err)
|
|
return err;
|
|
switch (obj->encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED:
|
|
*fvalue = value->svalue;
|
|
break;
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
*fvalue = value->uvalue;
|
|
break;
|
|
case DRGN_OBJECT_ENCODING_FLOAT:
|
|
*fvalue = value->fvalue;
|
|
break;
|
|
default:
|
|
err = drgn_error_create(DRGN_ERROR_TYPE,
|
|
"object cannot be converted to floating-point");
|
|
break;
|
|
}
|
|
drgn_object_deinit_value(obj, value);
|
|
return err;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_is_zero_impl(const struct drgn_object *obj, bool *ret);
|
|
|
|
static struct drgn_error *
|
|
drgn_compound_object_is_zero(const struct drgn_object *obj,
|
|
struct drgn_type *underlying_type, bool *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_object member;
|
|
struct drgn_type_member *members;
|
|
size_t num_members, i;
|
|
|
|
drgn_object_init(&member, drgn_object_program(obj));
|
|
members = drgn_type_members(underlying_type);
|
|
num_members = drgn_type_num_members(underlying_type);
|
|
for (i = 0; i < num_members; i++) {
|
|
struct drgn_qualified_type member_type;
|
|
uint64_t member_bit_field_size;
|
|
err = drgn_member_type(&members[i], &member_type,
|
|
&member_bit_field_size);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = drgn_object_slice(&member, obj, member_type,
|
|
members[i].bit_offset,
|
|
member_bit_field_size);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = drgn_object_is_zero_impl(&member, ret);
|
|
if (err || !*ret)
|
|
goto out;
|
|
}
|
|
|
|
err = NULL;
|
|
out:
|
|
drgn_object_deinit(&member);
|
|
return err;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_array_object_is_zero(const struct drgn_object *obj,
|
|
struct drgn_type *underlying_type, bool *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_qualified_type element_type;
|
|
uint64_t element_bit_size, length, i;
|
|
struct drgn_object element;
|
|
|
|
element_type = drgn_type_type(underlying_type);
|
|
err = drgn_type_bit_size(element_type.type, &element_bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
drgn_object_init(&element, drgn_object_program(obj));
|
|
length = drgn_type_length(underlying_type);
|
|
for (i = 0; i < length; i++) {
|
|
err = drgn_object_slice(&element, obj, element_type,
|
|
i * element_bit_size, 0);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = drgn_object_is_zero_impl(&element, ret);
|
|
if (err || !*ret)
|
|
goto out;
|
|
}
|
|
|
|
err = NULL;
|
|
out:
|
|
drgn_object_deinit(&element);
|
|
return err;
|
|
}
|
|
|
|
static struct drgn_error *
|
|
drgn_object_is_zero_impl(const struct drgn_object *obj, bool *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
switch (obj->encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t svalue;
|
|
|
|
err = drgn_object_value_signed(obj, &svalue);
|
|
if (err)
|
|
return err;
|
|
if (svalue)
|
|
*ret = false;
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: {
|
|
uint64_t uvalue;
|
|
|
|
err = drgn_object_value_unsigned(obj, &uvalue);
|
|
if (err)
|
|
return err;
|
|
if (uvalue)
|
|
*ret = false;
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_FLOAT: {
|
|
double fvalue;
|
|
|
|
err = drgn_object_value_float(obj, &fvalue);
|
|
if (err)
|
|
return err;
|
|
if (fvalue)
|
|
*ret = false;
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_BUFFER: {
|
|
struct drgn_type *underlying_type;
|
|
|
|
underlying_type = drgn_underlying_type(obj->type);
|
|
switch (drgn_type_kind(underlying_type)) {
|
|
case DRGN_TYPE_STRUCT:
|
|
case DRGN_TYPE_UNION:
|
|
case DRGN_TYPE_CLASS:
|
|
return drgn_compound_object_is_zero(obj,
|
|
underlying_type,
|
|
ret);
|
|
case DRGN_TYPE_ARRAY:
|
|
return drgn_array_object_is_zero(obj, underlying_type,
|
|
ret);
|
|
default:
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
}
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"object cannot be converted to boolean");
|
|
}
|
|
}
|
|
|
|
struct drgn_error *drgn_object_is_zero(const struct drgn_object *obj, bool *ret)
|
|
{
|
|
*ret = true;
|
|
return drgn_object_is_zero_impl(obj, ret);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_cast(struct drgn_object *res,
|
|
struct drgn_qualified_type qualified_type,
|
|
const struct drgn_object *obj)
|
|
{
|
|
const struct drgn_language *lang = drgn_type_language(qualified_type.type);
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
return lang->op_cast(res, qualified_type, obj);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_reinterpret(struct drgn_object *res,
|
|
struct drgn_qualified_type qualified_type,
|
|
enum drgn_byte_order byte_order,
|
|
const struct drgn_object *obj)
|
|
{
|
|
struct drgn_error *err;
|
|
bool little_endian;
|
|
struct drgn_object_type type;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
err = drgn_byte_order_to_little_endian(drgn_object_program(res),
|
|
byte_order, &little_endian);
|
|
if (err)
|
|
return err;
|
|
|
|
err = drgn_object_set_common(qualified_type, 0, &type, &encoding,
|
|
&bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
SWITCH_ENUM(obj->kind,
|
|
case DRGN_OBJECT_VALUE:
|
|
if (obj->encoding != DRGN_OBJECT_ENCODING_BUFFER) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"cannot reinterpret primitive value");
|
|
}
|
|
err = drgn_object_slice_internal(res, obj, &type, encoding,
|
|
bit_size, 0);
|
|
if (err)
|
|
return err;
|
|
res->little_endian = little_endian;
|
|
return NULL;
|
|
case DRGN_OBJECT_REFERENCE:
|
|
drgn_object_reinit(res, &type, encoding, bit_size,
|
|
DRGN_OBJECT_REFERENCE);
|
|
res->address = obj->address;
|
|
res->bit_offset = obj->bit_offset;
|
|
res->little_endian = little_endian;
|
|
return NULL;
|
|
case DRGN_OBJECT_ABSENT:
|
|
return &drgn_error_object_absent;
|
|
)
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_integer_literal(struct drgn_object *res, uint64_t uvalue)
|
|
{
|
|
const struct drgn_language *lang =
|
|
drgn_program_language(drgn_object_program(res));
|
|
return lang->integer_literal(res, uvalue);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_bool_literal(struct drgn_object *res, bool bvalue)
|
|
{
|
|
const struct drgn_language *lang =
|
|
drgn_program_language(drgn_object_program(res));
|
|
return lang->bool_literal(res, bvalue);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_float_literal(struct drgn_object *res, double fvalue)
|
|
{
|
|
const struct drgn_language *lang =
|
|
drgn_program_language(drgn_object_program(res));
|
|
return lang->float_literal(res, fvalue);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_bool(const struct drgn_object *obj, bool *ret)
|
|
{
|
|
const struct drgn_language *lang = drgn_object_language(obj);
|
|
|
|
return lang->op_bool(obj, ret);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *drgn_object_cmp(const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs,
|
|
int *ret)
|
|
{
|
|
const struct drgn_language *lang = drgn_object_language(lhs);
|
|
if (drgn_object_program(lhs) != drgn_object_program(rhs)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
return lang->op_cmp(lhs, rhs, ret);
|
|
}
|
|
|
|
struct drgn_error *drgn_error_binary_op(const char *op_name,
|
|
struct drgn_object_type *lhs_type,
|
|
struct drgn_object_type *rhs_type)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_qualified_type lhs_qualified_type = {
|
|
.type = lhs_type->type,
|
|
.qualifiers = lhs_type->qualifiers,
|
|
};
|
|
struct drgn_qualified_type rhs_qualified_type = {
|
|
.type = rhs_type->type,
|
|
.qualifiers = rhs_type->qualifiers,
|
|
};
|
|
char *lhs_type_name, *rhs_type_name;
|
|
|
|
err = drgn_format_type_name(lhs_qualified_type, &lhs_type_name);
|
|
if (err)
|
|
return err;
|
|
err = drgn_format_type_name(rhs_qualified_type, &rhs_type_name);
|
|
if (err) {
|
|
free(lhs_type_name);
|
|
return err;
|
|
}
|
|
err = drgn_error_format(DRGN_ERROR_TYPE,
|
|
"invalid operands to %s ('%s' and '%s')",
|
|
op_name, lhs_type_name, rhs_type_name);
|
|
free(rhs_type_name);
|
|
free(lhs_type_name);
|
|
return err;
|
|
|
|
}
|
|
|
|
struct drgn_error *drgn_error_unary_op(const char *op_name,
|
|
struct drgn_object_type *type)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_qualified_type qualified_type = {
|
|
.type = type->type,
|
|
.qualifiers = type->qualifiers,
|
|
};
|
|
char *type_name;
|
|
|
|
err = drgn_format_type_name(qualified_type, &type_name);
|
|
if (err)
|
|
return err;
|
|
err = drgn_error_format(DRGN_ERROR_TYPE,
|
|
"invalid operand to %s ('%s')",
|
|
op_name, type_name);
|
|
free(type_name);
|
|
return err;
|
|
}
|
|
|
|
#define BINARY_OP(op_name) \
|
|
LIBDRGN_PUBLIC struct drgn_error * \
|
|
drgn_object_##op_name(struct drgn_object *res, const struct drgn_object *lhs, \
|
|
const struct drgn_object *rhs) \
|
|
{ \
|
|
const struct drgn_language *lang = drgn_object_language(lhs); \
|
|
\
|
|
if (drgn_object_program(lhs) != drgn_object_program(res) || \
|
|
drgn_object_program(rhs) != drgn_object_program(res)) { \
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT, \
|
|
"objects are from different programs");\
|
|
} \
|
|
if (!lang->op_##op_name) { \
|
|
return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT, \
|
|
"%s does not implement " #op_name, \
|
|
lang->name); \
|
|
} \
|
|
return lang->op_##op_name(res, lhs, rhs); \
|
|
}
|
|
BINARY_OP(add)
|
|
BINARY_OP(sub)
|
|
BINARY_OP(mul)
|
|
BINARY_OP(div)
|
|
BINARY_OP(mod)
|
|
BINARY_OP(lshift)
|
|
BINARY_OP(rshift)
|
|
BINARY_OP(and)
|
|
BINARY_OP(or)
|
|
BINARY_OP(xor)
|
|
#undef BINARY_OP
|
|
|
|
#define UNARY_OP(op_name) \
|
|
LIBDRGN_PUBLIC struct drgn_error * \
|
|
drgn_object_##op_name(struct drgn_object *res, const struct drgn_object *obj) \
|
|
{ \
|
|
const struct drgn_language *lang = drgn_object_language(obj); \
|
|
\
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) { \
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT, \
|
|
"objects are from different programs");\
|
|
} \
|
|
if (!lang->op_##op_name) { \
|
|
return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT, \
|
|
"%s does not implement " #op_name, \
|
|
lang->name); \
|
|
} \
|
|
return lang->op_##op_name(res, obj); \
|
|
}
|
|
UNARY_OP(pos)
|
|
UNARY_OP(neg)
|
|
UNARY_OP(not)
|
|
#undef UNARY_OP
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_address_of(struct drgn_object *res, const struct drgn_object *obj)
|
|
{
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
SWITCH_ENUM(obj->kind,
|
|
case DRGN_OBJECT_VALUE:
|
|
return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"cannot take address of value");
|
|
case DRGN_OBJECT_REFERENCE:
|
|
break;
|
|
case DRGN_OBJECT_ABSENT:
|
|
return &drgn_error_object_absent;
|
|
)
|
|
|
|
if (obj->is_bit_field || obj->bit_offset) {
|
|
return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"cannot take address of bit field");
|
|
}
|
|
|
|
struct drgn_qualified_type qualified_type =
|
|
drgn_object_qualified_type(obj);
|
|
uint8_t word_size;
|
|
struct drgn_error *err =
|
|
drgn_program_word_size(drgn_object_program(obj), &word_size);
|
|
if (err)
|
|
return err;
|
|
struct drgn_qualified_type result_type;
|
|
err = drgn_pointer_type_create(drgn_object_program(obj), qualified_type,
|
|
word_size,
|
|
drgn_type_language(qualified_type.type),
|
|
&result_type.type);
|
|
if (err)
|
|
return err;
|
|
result_type.qualifiers = 0;
|
|
return drgn_object_set_unsigned(res, result_type,
|
|
obj->address, 0);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_subscript(struct drgn_object *res, const struct drgn_object *obj,
|
|
int64_t index)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_element_info element;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
err = drgn_program_element_info(drgn_object_program(obj), obj->type,
|
|
&element);
|
|
if (err)
|
|
return err;
|
|
|
|
if (obj->encoding == DRGN_OBJECT_ENCODING_UNSIGNED) {
|
|
return drgn_object_dereference_offset(res, obj,
|
|
element.qualified_type,
|
|
index * element.bit_size,
|
|
0);
|
|
} else {
|
|
return drgn_object_slice(res, obj, element.qualified_type,
|
|
index * element.bit_size, 0);
|
|
}
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_member(struct drgn_object *res, const struct drgn_object *obj,
|
|
const char *member_name)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
struct drgn_type_member *member;
|
|
uint64_t member_bit_offset;
|
|
err = drgn_type_find_member(obj->type, member_name, &member,
|
|
&member_bit_offset);
|
|
if (err)
|
|
return err;
|
|
struct drgn_qualified_type member_type;
|
|
uint64_t member_bit_field_size;
|
|
err = drgn_member_type(member, &member_type, &member_bit_field_size);
|
|
if (err)
|
|
return err;
|
|
return drgn_object_slice(res, obj, member_type, member_bit_offset,
|
|
member_bit_field_size);
|
|
}
|
|
|
|
struct drgn_error *drgn_object_member_dereference(struct drgn_object *res,
|
|
const struct drgn_object *obj,
|
|
const char *member_name)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
struct drgn_type *underlying_type = drgn_underlying_type(obj->type);
|
|
if (drgn_type_kind(underlying_type) != DRGN_TYPE_POINTER) {
|
|
return drgn_type_error("'%s' is not a pointer to a structure, union, or class",
|
|
obj->type);
|
|
}
|
|
|
|
struct drgn_type_member *member;
|
|
uint64_t member_bit_offset;
|
|
err = drgn_type_find_member(drgn_type_type(underlying_type).type,
|
|
member_name, &member, &member_bit_offset);
|
|
if (err)
|
|
return err;
|
|
struct drgn_qualified_type member_type;
|
|
uint64_t member_bit_field_size;
|
|
err = drgn_member_type(member, &member_type, &member_bit_field_size);
|
|
if (err)
|
|
return err;
|
|
return drgn_object_dereference_offset(res, obj, member_type,
|
|
member_bit_offset,
|
|
member_bit_field_size);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_container_of(struct drgn_object *res, const struct drgn_object *obj,
|
|
struct drgn_qualified_type qualified_type,
|
|
const char *member_designator)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
if (drgn_object_program(res) != drgn_object_program(obj)) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"objects are from different programs");
|
|
}
|
|
|
|
if (drgn_type_kind(drgn_underlying_type(obj->type)) !=
|
|
DRGN_TYPE_POINTER) {
|
|
return drgn_type_error("container_of() argument must be a pointer, not '%s'",
|
|
obj->type);
|
|
}
|
|
|
|
uint64_t offset;
|
|
err = drgn_type_offsetof(qualified_type.type, member_designator,
|
|
&offset);
|
|
if (err)
|
|
return err;
|
|
|
|
uint64_t address;
|
|
err = drgn_object_value_unsigned(obj, &address);
|
|
if (err)
|
|
return err;
|
|
|
|
uint8_t word_size;
|
|
err = drgn_program_word_size(drgn_object_program(obj), &word_size);
|
|
if (err)
|
|
return err;
|
|
struct drgn_qualified_type result_type;
|
|
err = drgn_pointer_type_create(drgn_object_program(obj), qualified_type,
|
|
word_size,
|
|
drgn_type_language(qualified_type.type),
|
|
&result_type.type);
|
|
if (err)
|
|
return err;
|
|
result_type.qualifiers = 0;
|
|
return drgn_object_set_unsigned(res, result_type, address - offset, 0);
|
|
}
|
|
|
|
LIBDRGN_PUBLIC struct drgn_error *
|
|
drgn_object_sizeof(const struct drgn_object *obj, uint64_t *ret)
|
|
{
|
|
if (obj->is_bit_field) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"cannot get size of bit field");
|
|
}
|
|
return drgn_type_sizeof(obj->type, ret);
|
|
}
|
|
|
|
static inline struct drgn_error *
|
|
binary_operands_signed(const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs, uint64_t bit_size,
|
|
int64_t *lhs_ret, int64_t *rhs_ret)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
err = drgn_object_convert_signed(lhs, bit_size, lhs_ret);
|
|
if (err)
|
|
return err;
|
|
return drgn_object_convert_signed(rhs, bit_size, rhs_ret);
|
|
}
|
|
|
|
static inline struct drgn_error *
|
|
binary_operands_unsigned(const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs, uint64_t bit_size,
|
|
uint64_t *lhs_ret, uint64_t *rhs_ret)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
err = drgn_object_convert_unsigned(lhs, bit_size, lhs_ret);
|
|
if (err)
|
|
return err;
|
|
return drgn_object_convert_unsigned(rhs, bit_size, rhs_ret);
|
|
}
|
|
|
|
static inline struct drgn_error *
|
|
binary_operands_float(const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs, double *lhs_ret,
|
|
double *rhs_ret)
|
|
{
|
|
struct drgn_error *err;
|
|
|
|
err = drgn_object_convert_float(lhs, lhs_ret);
|
|
if (err)
|
|
return err;
|
|
return drgn_object_convert_float(rhs, rhs_ret);
|
|
}
|
|
|
|
static struct drgn_error *pointer_operand(const struct drgn_object *ptr,
|
|
uint64_t *ret)
|
|
{
|
|
switch (ptr->encoding) {
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
return drgn_object_value_unsigned(ptr, ret);
|
|
case DRGN_OBJECT_ENCODING_BUFFER:
|
|
case DRGN_OBJECT_ENCODING_NONE:
|
|
case DRGN_OBJECT_ENCODING_INCOMPLETE_BUFFER:
|
|
SWITCH_ENUM(ptr->kind,
|
|
case DRGN_OBJECT_VALUE:
|
|
return drgn_error_format(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"cannot get address of value");
|
|
case DRGN_OBJECT_REFERENCE:
|
|
*ret = ptr->address;
|
|
return NULL;
|
|
case DRGN_OBJECT_ABSENT:
|
|
return &drgn_error_object_absent;
|
|
)
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid operand type for pointer arithmetic");
|
|
}
|
|
}
|
|
|
|
static struct drgn_error *drgn_error_cast(struct drgn_object_type *to,
|
|
struct drgn_object_type *from)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_qualified_type to_qualified_type = {
|
|
.type = to->type,
|
|
.qualifiers = to->qualifiers,
|
|
};
|
|
struct drgn_qualified_type from_qualified_type = {
|
|
.type = from->type,
|
|
.qualifiers = from->qualifiers,
|
|
};
|
|
char *to_type_name, *from_type_name;
|
|
|
|
err = drgn_format_type_name(to_qualified_type, &to_type_name);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
err = drgn_format_type_name(from_qualified_type, &from_type_name);
|
|
if (err) {
|
|
free(from_type_name);
|
|
return err;
|
|
}
|
|
err = drgn_error_format(DRGN_ERROR_TYPE,
|
|
"cannot convert '%s' to '%s'",
|
|
from_type_name, to_type_name);
|
|
free(from_type_name);
|
|
free(to_type_name);
|
|
return err;
|
|
}
|
|
|
|
struct drgn_error *drgn_op_cast(struct drgn_object *res,
|
|
struct drgn_qualified_type qualified_type,
|
|
const struct drgn_object *obj,
|
|
struct drgn_object_type *obj_type)
|
|
{
|
|
struct drgn_error *err;
|
|
struct drgn_object_type type;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
bool is_pointer;
|
|
|
|
err = drgn_object_set_common(qualified_type, 0, &type, &encoding,
|
|
&bit_size);
|
|
if (err)
|
|
goto err;
|
|
|
|
if (!drgn_object_encoding_is_complete(encoding)) {
|
|
return drgn_error_incomplete_type("cannot cast to %s type",
|
|
type.type);
|
|
}
|
|
|
|
is_pointer = (drgn_type_kind(obj_type->underlying_type) ==
|
|
DRGN_TYPE_POINTER);
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_BUFFER: {
|
|
char *type_name;
|
|
err = drgn_format_type_name(qualified_type, &type_name);
|
|
if (err)
|
|
return err;
|
|
err = drgn_error_format(DRGN_ERROR_TYPE, "cannot cast to '%s'",
|
|
type_name);
|
|
free(type_name);
|
|
return err;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
union {
|
|
int64_t svalue;
|
|
uint64_t uvalue;
|
|
} tmp;
|
|
|
|
if (is_pointer) {
|
|
err = pointer_operand(obj, &tmp.uvalue);
|
|
} else {
|
|
err = drgn_object_convert_signed(obj, bit_size,
|
|
&tmp.svalue);
|
|
}
|
|
if (err)
|
|
goto err;
|
|
return drgn_object_set_signed_internal(res, &type, bit_size,
|
|
tmp.svalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: {
|
|
uint64_t uvalue;
|
|
|
|
if (is_pointer) {
|
|
err = pointer_operand(obj, &uvalue);
|
|
} else {
|
|
err = drgn_object_convert_unsigned(obj, bit_size,
|
|
&uvalue);
|
|
}
|
|
if (err)
|
|
goto err;
|
|
return drgn_object_set_unsigned_internal(res, &type, bit_size,
|
|
uvalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_FLOAT: {
|
|
double fvalue;
|
|
|
|
if (is_pointer)
|
|
goto type_error;
|
|
|
|
err = drgn_object_convert_float(obj, &fvalue);
|
|
if (err)
|
|
goto err;
|
|
return drgn_object_set_float_internal(res, &type, bit_size,
|
|
fvalue);
|
|
}
|
|
default:
|
|
goto type_error;
|
|
}
|
|
|
|
err:
|
|
if (err->code == DRGN_ERROR_TYPE) {
|
|
drgn_error_destroy(err);
|
|
goto type_error;
|
|
}
|
|
return err;
|
|
|
|
type_error:
|
|
return drgn_error_cast(&type, obj_type);
|
|
}
|
|
|
|
/*
|
|
* Two's complement operator. Avoid undefined/implementation-defined behavior
|
|
* (due to overflow or signed integer representation) for an arithmetic or
|
|
* bitwise operator by doing the operation on unsigned operands and then
|
|
* converting back to a signed integer.
|
|
*/
|
|
#define BINARY_OP_SIGNED_2C(res, type, bit_size, lhs, op, rhs) ({ \
|
|
struct drgn_error *_err; \
|
|
uint64_t _bit_size = (bit_size); \
|
|
union { \
|
|
int64_t svalue; \
|
|
uint64_t uvalue; \
|
|
} lhs_tmp, rhs_tmp, tmp; \
|
|
\
|
|
_err = binary_operands_signed((lhs), (rhs), _bit_size, \
|
|
&lhs_tmp.svalue, &rhs_tmp.svalue); \
|
|
if (!_err) { \
|
|
tmp.uvalue = lhs_tmp.uvalue op rhs_tmp.uvalue; \
|
|
_err = drgn_object_set_signed_internal((res), (type), \
|
|
_bit_size, tmp.svalue); \
|
|
} \
|
|
_err; \
|
|
})
|
|
|
|
#define BINARY_OP_UNSIGNED(res, type, bit_size, lhs, op, rhs) ({ \
|
|
struct drgn_error *_err; \
|
|
uint64_t _bit_size = (bit_size); \
|
|
uint64_t lhs_uvalue, rhs_uvalue; \
|
|
\
|
|
_err = binary_operands_unsigned((lhs), (rhs), _bit_size, &lhs_uvalue, \
|
|
&rhs_uvalue); \
|
|
if (!_err) { \
|
|
_err = drgn_object_set_unsigned_internal((res), (type), \
|
|
_bit_size, \
|
|
lhs_uvalue op \
|
|
rhs_uvalue); \
|
|
} \
|
|
_err; \
|
|
})
|
|
|
|
#define BINARY_OP_FLOAT(res, type, bit_size, lhs, op, rhs) ({ \
|
|
struct drgn_error *_err; \
|
|
double lhs_fvalue, rhs_fvalue; \
|
|
\
|
|
_err = binary_operands_float((lhs), (rhs), &lhs_fvalue, &rhs_fvalue); \
|
|
if (!_err) { \
|
|
_err = drgn_object_set_float_internal((res), (type), \
|
|
(bit_size), \
|
|
lhs_fvalue op \
|
|
rhs_fvalue); \
|
|
} \
|
|
_err; \
|
|
})
|
|
|
|
#define CMP(lhs, rhs) ({ \
|
|
__auto_type _lhs = (lhs); \
|
|
__auto_type _rhs = (rhs); \
|
|
\
|
|
(_lhs > _rhs ? 1 : _lhs < _rhs ? -1 : 0); \
|
|
})
|
|
|
|
struct drgn_error *drgn_op_cmp_impl(const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs,
|
|
const struct drgn_object_type *type,
|
|
int *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t lhs_svalue, rhs_svalue;
|
|
|
|
err = binary_operands_signed(lhs, rhs, bit_size, &lhs_svalue,
|
|
&rhs_svalue);
|
|
if (err)
|
|
return err;
|
|
*ret = CMP(lhs_svalue, rhs_svalue);
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: {
|
|
uint64_t lhs_uvalue, rhs_uvalue;
|
|
|
|
err = binary_operands_unsigned(lhs, rhs, bit_size, &lhs_uvalue,
|
|
&rhs_uvalue);
|
|
if (err)
|
|
return err;
|
|
*ret = CMP(lhs_uvalue, rhs_uvalue);
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_FLOAT: {
|
|
double lhs_fvalue, rhs_fvalue;
|
|
|
|
err = binary_operands_float(lhs, rhs, &lhs_fvalue, &rhs_fvalue);
|
|
if (err)
|
|
return err;
|
|
*ret = CMP(lhs_fvalue, rhs_fvalue);
|
|
return NULL;
|
|
}
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid operand type for cmp");
|
|
}
|
|
}
|
|
|
|
struct drgn_error *drgn_op_cmp_pointers(const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs, int *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
uint64_t lhs_value, rhs_value;
|
|
|
|
err = pointer_operand(lhs, &lhs_value);
|
|
if (err)
|
|
return err;
|
|
err = pointer_operand(rhs, &rhs_value);
|
|
if (err)
|
|
return err;
|
|
|
|
*ret = CMP(lhs_value, rhs_value);
|
|
return NULL;
|
|
}
|
|
|
|
#undef CMP
|
|
|
|
#define ARITHMETIC_BINARY_OP(op_name, op) \
|
|
struct drgn_error * \
|
|
drgn_op_##op_name##_impl(struct drgn_object *res, \
|
|
const struct drgn_object_type *type, \
|
|
const struct drgn_object *lhs, \
|
|
const struct drgn_object *rhs) \
|
|
{ \
|
|
struct drgn_error *err; \
|
|
enum drgn_object_encoding encoding; \
|
|
uint64_t bit_size; \
|
|
\
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size); \
|
|
if (err) \
|
|
return err; \
|
|
\
|
|
switch (encoding) { \
|
|
case DRGN_OBJECT_ENCODING_SIGNED: \
|
|
return BINARY_OP_SIGNED_2C(res, type, bit_size, lhs, op, rhs); \
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: \
|
|
return BINARY_OP_UNSIGNED(res, type, bit_size, lhs, op, rhs); \
|
|
case DRGN_OBJECT_ENCODING_FLOAT: \
|
|
return BINARY_OP_FLOAT(res, type, bit_size, lhs, op, rhs); \
|
|
default: \
|
|
return drgn_error_create(DRGN_ERROR_TYPE, \
|
|
"invalid result type for " #op_name); \
|
|
} \
|
|
}
|
|
ARITHMETIC_BINARY_OP(add, +)
|
|
ARITHMETIC_BINARY_OP(sub, -)
|
|
#undef ARITHMETIC_BINARY_OP
|
|
|
|
struct drgn_error *drgn_op_add_to_pointer(struct drgn_object *res,
|
|
const struct drgn_object_type *type,
|
|
uint64_t referenced_size, bool negate,
|
|
const struct drgn_object *ptr,
|
|
const struct drgn_object *index)
|
|
{
|
|
struct drgn_error *err;
|
|
uint64_t ptr_value, index_value;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
if (encoding != DRGN_OBJECT_ENCODING_UNSIGNED) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for pointer arithmetic");
|
|
}
|
|
|
|
err = pointer_operand(ptr, &ptr_value);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (index->encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t svalue;
|
|
|
|
err = drgn_object_value_signed(index, &svalue);
|
|
if (err)
|
|
return err;
|
|
if (svalue >= 0) {
|
|
index_value = svalue;
|
|
} else {
|
|
index_value = -svalue;
|
|
negate = !negate;
|
|
}
|
|
break;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
err = drgn_object_value_unsigned(index, &index_value);
|
|
if (err)
|
|
return err;
|
|
break;
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid addend type for pointer arithmetic");
|
|
}
|
|
|
|
if (negate)
|
|
ptr_value -= index_value * referenced_size;
|
|
else
|
|
ptr_value += index_value * referenced_size;
|
|
return drgn_object_set_unsigned_internal(res, type, bit_size,
|
|
ptr_value);
|
|
}
|
|
|
|
struct drgn_error *drgn_op_sub_pointers(struct drgn_object *res,
|
|
const struct drgn_object_type *type,
|
|
uint64_t referenced_size,
|
|
const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
uint64_t lhs_value, rhs_value;
|
|
int64_t diff;
|
|
|
|
if (!referenced_size) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"object size must not be zero");
|
|
}
|
|
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
if (encoding != DRGN_OBJECT_ENCODING_SIGNED) {
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for pointer subtraction");
|
|
}
|
|
|
|
err = pointer_operand(lhs, &lhs_value);
|
|
if (err)
|
|
return err;
|
|
err = pointer_operand(rhs, &rhs_value);
|
|
if (err)
|
|
return err;
|
|
|
|
if (lhs_value >= rhs_value)
|
|
diff = (lhs_value - rhs_value) / referenced_size;
|
|
else
|
|
diff = -((rhs_value - lhs_value) / referenced_size);
|
|
return drgn_object_set_signed_internal(res, type, bit_size, diff);
|
|
}
|
|
|
|
struct drgn_error *drgn_op_mul_impl(struct drgn_object *res,
|
|
const struct drgn_object_type *type,
|
|
const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t lhs_svalue, rhs_svalue;
|
|
uint64_t lhs_uvalue, rhs_uvalue;
|
|
bool lhs_negative, rhs_negative;
|
|
union {
|
|
int64_t svalue;
|
|
uint64_t uvalue;
|
|
} tmp;
|
|
|
|
err = binary_operands_signed(lhs, rhs, bit_size,
|
|
&lhs_svalue, &rhs_svalue);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* Convert to sign and magnitude to avoid signed integer
|
|
* overflow.
|
|
*/
|
|
lhs_negative = lhs_svalue < 0;
|
|
lhs_uvalue = lhs_negative ? -lhs_svalue : lhs_svalue;
|
|
rhs_negative = rhs_svalue < 0;
|
|
rhs_uvalue = rhs_negative ? -rhs_svalue : rhs_svalue;
|
|
tmp.uvalue = lhs_uvalue * rhs_uvalue;
|
|
if (lhs_negative ^ rhs_negative)
|
|
tmp.uvalue = -tmp.uvalue;
|
|
return drgn_object_set_signed_internal(res, type, bit_size,
|
|
tmp.svalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
return BINARY_OP_UNSIGNED(res, type, bit_size, lhs, *, rhs);
|
|
case DRGN_OBJECT_ENCODING_FLOAT:
|
|
return BINARY_OP_FLOAT(res, type, bit_size, lhs, *, rhs);
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for mul");
|
|
}
|
|
}
|
|
|
|
static struct drgn_error drgn_zero_division = {
|
|
.code = DRGN_ERROR_ZERO_DIVISION,
|
|
.message = "division by zero",
|
|
};
|
|
|
|
struct drgn_error *drgn_op_div_impl(struct drgn_object *res,
|
|
const struct drgn_object_type *type,
|
|
const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t lhs_svalue, rhs_svalue;
|
|
|
|
err = binary_operands_signed(lhs, rhs, bit_size,
|
|
&lhs_svalue, &rhs_svalue);
|
|
if (err)
|
|
return err;
|
|
if (!rhs_svalue)
|
|
return &drgn_zero_division;
|
|
return drgn_object_set_signed_internal(res, type, bit_size,
|
|
lhs_svalue / rhs_svalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: {
|
|
uint64_t lhs_uvalue, rhs_uvalue;
|
|
|
|
err = binary_operands_unsigned(lhs, rhs, bit_size, &lhs_uvalue,
|
|
&rhs_uvalue);
|
|
if (err)
|
|
return err;
|
|
if (!rhs_uvalue)
|
|
return &drgn_zero_division;
|
|
return drgn_object_set_unsigned_internal(res, type, bit_size,
|
|
lhs_uvalue /
|
|
rhs_uvalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_FLOAT: {
|
|
double lhs_fvalue, rhs_fvalue;
|
|
|
|
err = binary_operands_float(lhs, rhs, &lhs_fvalue, &rhs_fvalue);
|
|
if (err)
|
|
return err;
|
|
if (!rhs_fvalue)
|
|
return &drgn_zero_division;
|
|
return drgn_object_set_float_internal(res, type, bit_size,
|
|
lhs_fvalue / rhs_fvalue);
|
|
}
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for div");
|
|
}
|
|
}
|
|
|
|
struct drgn_error *drgn_op_mod_impl(struct drgn_object *res,
|
|
const struct drgn_object_type *type,
|
|
const struct drgn_object *lhs,
|
|
const struct drgn_object *rhs)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t lhs_svalue, rhs_svalue;
|
|
|
|
err = binary_operands_signed(lhs, rhs, bit_size,
|
|
&lhs_svalue, &rhs_svalue);
|
|
if (err)
|
|
return err;
|
|
if (!rhs_svalue)
|
|
return &drgn_zero_division;
|
|
return drgn_object_set_signed_internal(res, type, bit_size,
|
|
lhs_svalue % rhs_svalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: {
|
|
uint64_t lhs_uvalue, rhs_uvalue;
|
|
|
|
err = binary_operands_unsigned(lhs, rhs, bit_size,
|
|
&lhs_uvalue, &rhs_uvalue);
|
|
if (err)
|
|
return err;
|
|
if (!rhs_uvalue)
|
|
return &drgn_zero_division;
|
|
return drgn_object_set_unsigned_internal(res, type, bit_size,
|
|
lhs_uvalue %
|
|
rhs_uvalue);
|
|
}
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for mod");
|
|
}
|
|
}
|
|
|
|
static struct drgn_error *shift_operand(const struct drgn_object *rhs,
|
|
const struct drgn_object_type *rhs_type,
|
|
uint64_t *ret)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
err = drgn_object_type_encoding_and_size(rhs_type, &encoding,
|
|
&bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t rhs_svalue;
|
|
|
|
err = drgn_object_convert_signed(rhs, bit_size, &rhs_svalue);
|
|
if (err)
|
|
return err;
|
|
if (rhs_svalue < 0) {
|
|
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
|
|
"negative shift count");
|
|
}
|
|
*ret = rhs_svalue;
|
|
return NULL;
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
return drgn_object_convert_unsigned(rhs, bit_size, ret);
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid rhs type for shift");
|
|
}
|
|
}
|
|
|
|
struct drgn_error *drgn_op_lshift_impl(struct drgn_object *res,
|
|
const struct drgn_object *lhs,
|
|
const struct drgn_object_type *lhs_type,
|
|
const struct drgn_object *rhs,
|
|
const struct drgn_object_type *rhs_type)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
uint64_t shift;
|
|
|
|
err = drgn_object_type_encoding_and_size(lhs_type, &encoding,
|
|
&bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
err = shift_operand(rhs, rhs_type, &shift);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
union {
|
|
int64_t svalue;
|
|
uint64_t uvalue;
|
|
} tmp;
|
|
|
|
err = drgn_object_convert_signed(lhs, bit_size, &tmp.svalue);
|
|
if (err)
|
|
return err;
|
|
/* Left shift of a negative integer is undefined. */
|
|
if (shift < bit_size)
|
|
tmp.uvalue <<= shift;
|
|
else
|
|
tmp.uvalue = 0;
|
|
return drgn_object_set_signed_internal(res, lhs_type, bit_size,
|
|
tmp.svalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: {
|
|
uint64_t uvalue;
|
|
|
|
err = drgn_object_convert_unsigned(lhs, bit_size, &uvalue);
|
|
if (err)
|
|
return err;
|
|
if (shift < bit_size)
|
|
uvalue <<= shift;
|
|
else
|
|
uvalue = 0;
|
|
return drgn_object_set_unsigned_internal(res, lhs_type,
|
|
bit_size, uvalue);
|
|
}
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for lshift");
|
|
}
|
|
}
|
|
|
|
struct drgn_error *drgn_op_rshift_impl(struct drgn_object *res,
|
|
const struct drgn_object *lhs,
|
|
const struct drgn_object_type *lhs_type,
|
|
const struct drgn_object *rhs,
|
|
const struct drgn_object_type *rhs_type)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
uint64_t shift;
|
|
|
|
err = drgn_object_type_encoding_and_size(lhs_type, &encoding,
|
|
&bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
err = shift_operand(rhs, rhs_type, &shift);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED: {
|
|
int64_t svalue;
|
|
|
|
err = drgn_object_convert_signed(lhs, bit_size, &svalue);
|
|
if (err)
|
|
return err;
|
|
if (shift < bit_size)
|
|
svalue >>= shift;
|
|
else if (svalue >= 0)
|
|
svalue = 0;
|
|
else
|
|
svalue = -1;
|
|
return drgn_object_set_signed_internal(res, lhs_type, bit_size,
|
|
svalue);
|
|
}
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: {
|
|
uint64_t uvalue;
|
|
|
|
err = drgn_object_convert_unsigned(lhs, bit_size, &uvalue);
|
|
if (err)
|
|
return err;
|
|
if (shift < bit_size)
|
|
uvalue >>= shift;
|
|
else
|
|
uvalue = 0;
|
|
return drgn_object_set_unsigned_internal(res, lhs_type,
|
|
bit_size, uvalue);
|
|
}
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for lshift");
|
|
}
|
|
}
|
|
|
|
#define INTEGER_BINARY_OP(op_name, op) \
|
|
struct drgn_error * \
|
|
drgn_op_##op_name##_impl(struct drgn_object *res, \
|
|
const struct drgn_object_type *type, \
|
|
const struct drgn_object *lhs, \
|
|
const struct drgn_object *rhs) \
|
|
{ \
|
|
struct drgn_error *err; \
|
|
enum drgn_object_encoding encoding; \
|
|
uint64_t bit_size; \
|
|
\
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size); \
|
|
if (err) \
|
|
return err; \
|
|
\
|
|
switch (encoding) { \
|
|
case DRGN_OBJECT_ENCODING_SIGNED: \
|
|
return BINARY_OP_SIGNED_2C(res, type, bit_size, lhs, op, rhs); \
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: \
|
|
return BINARY_OP_UNSIGNED(res, type, bit_size, lhs, op, rhs); \
|
|
default: \
|
|
return drgn_error_create(DRGN_ERROR_TYPE, \
|
|
"invalid result type for " #op_name); \
|
|
} \
|
|
}
|
|
INTEGER_BINARY_OP(and, &)
|
|
INTEGER_BINARY_OP(or, |)
|
|
INTEGER_BINARY_OP(xor, ^)
|
|
#undef INTEGER_BINARY_OP
|
|
|
|
/* See BINARY_OP_SIGNED_2C. */
|
|
#define UNARY_OP_SIGNED_2C(res, type, bit_size, op, obj) ({ \
|
|
struct drgn_error *_err; \
|
|
uint64_t _bit_size = (bit_size); \
|
|
union { \
|
|
int64_t svalue; \
|
|
uint64_t uvalue; \
|
|
} tmp; \
|
|
\
|
|
_err = drgn_object_convert_signed((obj), _bit_size, &tmp.svalue); \
|
|
tmp.uvalue = op tmp.uvalue; \
|
|
if (!_err) { \
|
|
_err = drgn_object_set_signed_internal((res), (type), \
|
|
_bit_size, \
|
|
tmp.svalue); \
|
|
} \
|
|
_err; \
|
|
})
|
|
|
|
#define UNARY_OP_UNSIGNED(res, type, bit_size, op, obj) ({ \
|
|
struct drgn_error *_err; \
|
|
uint64_t _bit_size = (bit_size); \
|
|
uint64_t uvalue; \
|
|
\
|
|
_err = drgn_object_convert_unsigned((obj), bit_size, &uvalue); \
|
|
if (!_err) { \
|
|
_err = drgn_object_set_unsigned_internal((res), (type), \
|
|
_bit_size, op uvalue); \
|
|
\
|
|
} \
|
|
_err; \
|
|
})
|
|
|
|
#define ARITHMETIC_UNARY_OP(op_name, op) \
|
|
struct drgn_error * \
|
|
drgn_op_##op_name##_impl(struct drgn_object *res, \
|
|
const struct drgn_object_type *type, \
|
|
const struct drgn_object *obj) \
|
|
{ \
|
|
struct drgn_error *err; \
|
|
enum drgn_object_encoding encoding; \
|
|
uint64_t bit_size; \
|
|
\
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size); \
|
|
if (err) \
|
|
return err; \
|
|
\
|
|
switch (encoding) { \
|
|
case DRGN_OBJECT_ENCODING_SIGNED: \
|
|
return UNARY_OP_SIGNED_2C(res, type, bit_size, op, obj); \
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED: \
|
|
return UNARY_OP_UNSIGNED(res, type, bit_size, op, obj); \
|
|
case DRGN_OBJECT_ENCODING_FLOAT: { \
|
|
double fvalue; \
|
|
\
|
|
err = drgn_object_convert_float(obj, &fvalue); \
|
|
if (err) \
|
|
return err; \
|
|
return drgn_object_set_float_internal(res, type, bit_size, \
|
|
op fvalue); \
|
|
\
|
|
} \
|
|
default: \
|
|
return drgn_error_create(DRGN_ERROR_TYPE, \
|
|
"invalid result type for " #op_name); \
|
|
} \
|
|
}
|
|
ARITHMETIC_UNARY_OP(pos, +)
|
|
ARITHMETIC_UNARY_OP(neg, -)
|
|
#undef ARITHMETIC_UNARY_OP
|
|
|
|
struct drgn_error *drgn_op_not_impl(struct drgn_object *res,
|
|
const struct drgn_object_type *type,
|
|
const struct drgn_object *obj)
|
|
{
|
|
struct drgn_error *err;
|
|
enum drgn_object_encoding encoding;
|
|
uint64_t bit_size;
|
|
|
|
err = drgn_object_type_encoding_and_size(type, &encoding, &bit_size);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (encoding) {
|
|
case DRGN_OBJECT_ENCODING_SIGNED:
|
|
return UNARY_OP_SIGNED_2C(res, type, bit_size, ~, obj);
|
|
case DRGN_OBJECT_ENCODING_UNSIGNED:
|
|
return UNARY_OP_UNSIGNED(res, type, bit_size, ~, obj);
|
|
default:
|
|
return drgn_error_create(DRGN_ERROR_TYPE,
|
|
"invalid result type for not");
|
|
}
|
|
}
|