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Last change
on this file since 1280 was
1213,
checked in by sacerdot, 10 years ago
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1) New values (joint/BEValues.ma) and memory model for the back-ends
(joint/BEMem.ma) where all values are Byte-valued.
2) Improved joint semantics for the back-end languages based on the new
memory model (work in progress).
3) SmallStepExec? made more general to accomodate states with an arbitrary
memory inside.
4) New files common/Pointers.ma and common/GenMem.ma shared between the
front-end and the back-end. GenMem?.ma, at the moment, is not used in Mem.ma
(cut&paste code).
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File size:
810 bytes
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| 1 | (* Memory model used in the dynamic semantics of the back-end intermediate |
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| 2 | languages. Inspired by common/Mem.ma, adapted from Compcert *) |
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| 3 | |
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| 4 | (* * This file develops the memory model that is used in the dynamic |
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| 5 | semantics of all the languages used in the compiler. |
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| 6 | It defines a type [mem] of memory states, the following 4 basic |
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| 7 | operations over memory states, and their properties: |
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| 8 | - [load]: read a memory chunk at a given address; |
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| 9 | - [store]: store a memory chunk at a given address; |
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| 10 | - [alloc]: allocate a fresh memory block; |
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| 11 | - [free]: invalidate a memory block. |
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| 12 | *) |
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| 13 | |
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| 14 | include "joint/BEValues.ma". |
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| 15 | include "common/GenMem.ma". |
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| 16 | |
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| 17 | definition bemem ≝ mem (mk_contentT beval BVundef). |
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| 18 | |
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| 19 | axiom beloadv: ∀m:bemem. ∀ptr:pointer. option beval. |
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| 20 | axiom bestorev: ∀m:bemem. ∀ptr:pointer. beval → option bemem. |
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