3.1 The Plain-Memory SpecificationTechnically, plain memory is a speci terjemahan - 3.1 The Plain-Memory SpecificationTechnically, plain memory is a speci Bahasa Indonesia Bagaimana mengatakan

3.1 The Plain-Memory SpecificationT

3.1 The Plain-Memory Specification
Technically, plain memory is a specification that provides byte-wise read and write
access to memory, where special properties are guaranteed for read-blessed and
read/write-blessed address regions. The general idea is simple. Memory at blessed
addresses is well-behaved: a read access does not change anything in the blessed
address range, and a write access only changes the bytes written (in the expected
way). The side-effect transformers must neither change the memory block nor any
memory at blessed addresses. Moreover, these special properties are maintained as
long as only blessed addresses are accessed. However, no guarantees are made for
the memory contents at non-blessed addresses (even when only accessing blessed
addresses), and for memory accesses outside the blessed address regions.
We want the plain-memory specification to be usable with all concrete memory
models, including physical real-address memory. Therefore, the specification must
describe all its properties with observations that can be made by reading and writing
single bytes only, by referring to the Memory_struct interface that is common to all
memory models. In PVS the specification is split into a record of functions (capturing
the plain-memory signature), and a predicate for the required properties. With this
technique the axioms of the plain-memory specification do not show up as axioms
in the PVS formalization, hence they do not affect consistency. Instead, any use of a
plain-memory property in a verification proof will spawn a subgoal requiring a proof
204 H. Tews et al.
of the plain-memory axioms for the underlying memory model. The plain-memory
signature is given by the following record.
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3.1 The Plain-Memory Specification
Technically, plain memory is a specification that provides byte-wise read and write
access to memory, where special properties are guaranteed for read-blessed and
read/write-blessed address regions. The general idea is simple. Memory at blessed
addresses is well-behaved: a read access does not change anything in the blessed
address range, and a write access only changes the bytes written (in the expected
way). The side-effect transformers must neither change the memory block nor any
memory at blessed addresses. Moreover, these special properties are maintained as
long as only blessed addresses are accessed. However, no guarantees are made for
the memory contents at non-blessed addresses (even when only accessing blessed
addresses), and for memory accesses outside the blessed address regions.
We want the plain-memory specification to be usable with all concrete memory
models, including physical real-address memory. Therefore, the specification must
describe all its properties with observations that can be made by reading and writing
single bytes only, by referring to the Memory_struct interface that is common to all
memory models. In PVS the specification is split into a record of functions (capturing
the plain-memory signature), and a predicate for the required properties. With this
technique the axioms of the plain-memory specification do not show up as axioms
in the PVS formalization, hence they do not affect consistency. Instead, any use of a
plain-memory property in a verification proof will spawn a subgoal requiring a proof
204 H. Tews et al.
of the plain-memory axioms for the underlying memory model. The plain-memory
signature is given by the following record.
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Hasil (Bahasa Indonesia) 2:[Salinan]
Disalin!
3.1 Plain-Memory Spesifikasi
teknis, memori polos adalah spesifikasi yang menyediakan byte-bijaksana membaca dan menulis
akses ke memori, di mana sifat khusus yang dijamin untuk dibaca-diberkati dan
membaca / menulis diberkati alamat daerah. Ide umum sederhana. Memori pada diberkati
alamat yang berperilaku baik: akses baca tidak mengubah apa pun dalam diberkati
rentang alamat, dan akses tulis hanya mengubah byte yang ditulis (dalam diharapkan
arah). Transformer efek samping tidak harus mengubah blok memori maupun
memori pada alamat diberkati. Selain itu, sifat-sifat khusus dipertahankan sebagai
selama hanya alamat diberkati diakses. Namun, tidak ada jaminan yang dibuat untuk
isi memori pada alamat non-diberkati (bahkan ketika hanya mengakses diberkati
alamat), dan untuk mengakses memori luar alamat daerah diberkati.
Kami ingin spesifikasi biasa-memori yang dapat digunakan dengan semua memori beton
model, termasuk fisik memori nyata-alamat. Oleh karena itu, spesifikasi harus
menjelaskan semua sifat-sifatnya dengan pengamatan yang dapat dibuat dengan membaca dan menulis
byte tunggal saja, dengan mengacu pada antarmuka Memory_struct yang umum untuk semua
model memori. Di PVS spesifikasi dibagi menjadi rekor fungsi (menangkap
tanda tangan polos-memory), dan predikat untuk properti yang diperlukan. Dengan
teknik aksioma spesifikasi polos-memori tidak muncul sebagai aksioma
dalam formalisasi PVS, maka mereka tidak mempengaruhi konsistensi. Sebaliknya, setiap penggunaan
properti polos-memori bukti verifikasi akan menelurkan subgoal membutuhkan bukti
204 H. Tews et al.
aksioma polos-memori untuk model memori yang mendasari. Dataran-memori
signature diberikan oleh catatan berikut.
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