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Scott Owens f298d728c5 [sledge sem] Start sketching translation correctness ... Summary: This includes a few changes and corrections to the semantics, to support the translation. This initial attempt to reason about LLVM -> llair showed three things that needed repair in the semantics, in addition to various bugs. We address them as follows. Refactor llair semantics to have only a single kind of flat value: integers that fit into specified bit widths. Operations on size values (e.g., offsets, indices and the like) can just take an integer and ignore its number of bits. Pointers can just be considered integers that fit into a certain size given by the constant pointer_size. Later on we can consider making this a parameter to the model. Change the generic memory model interface to use numbers rather than words as the generic encoding of a large value. This makes it more useful for llair where words are not used. Pay more careful attention to signed/unsigned issues. Neither LLVM nor llair have a concept of signed vs unsigned value. Instead individual operations interpret bit patterns in various ways, some of which are ambiguous in the LLVM manual. For example, since getelementpointer's indices are explicitly said to be interpreted as signed 2's complement, we should probably do the same for insertvalue and extractvalue. However it is not clear how the argument to alloca is to be interpreted. For now we assume signed. Reviewed By: jberdine Differential Revision: D17164133 fbshipit-source-id: 31a8af635		5 years ago
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.gitignore	Definie a prelim. AST for llair's semantics	5 years ago
Holmakefile	Add initial mini-LLVM semantics written in HOL4	5 years ago
llairScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
llair_propScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
llvmScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
llvm_propScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
llvm_to_llairScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
llvm_to_llair_propScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
memory_modelScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
miscScript.sml	[sledge sem] Start sketching translation correctness	5 years ago
settingsScript.sml	[sledge sem] Start sketching translation correctness	5 years ago