Implementation of the JacoDB interpreter #18
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Fix: not heapRefEq
… different size now
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Co-authored-by: Alexey Menshutin <[email protected]>
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Co-authored-by: Alexey Menshutin <[email protected]>
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* First version of logging for usvm * Implementation of the JacoDB interpreter (#18) Co-authored-by: Alexey Menshutin <[email protected]> * New path selectors infrastructure (#29) * Add general framework for weighted searchers * Add tests for AA-tree and discrete PDF * Little typo fix in tests * Add shortest distance to targets weighter * Add random tree path selector * Add fork depth path selector * Fix interleaved path selector * Add comments and some new java tests, infrastructure fixes * PR comments fixes, add solver type and timeout options * First version of logging for usvm * synchronize with master --------- Co-authored-by: Sergey Pospelov <[email protected]> Co-authored-by: Alexey Menshutin <[email protected]> Co-authored-by: Maksim Parshin <[email protected]>
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This PR adds an initial support of the JVM byte-code analysis. In addition, simple search strategies
DfsPathSelector,BfsPathSelectorand combinators were implemented, as well asTargetsCoveredStoppingStrategy. Also, some minor refactorings inusvm-corewere made.The PR includes some tests, comments and lots of TODOs in the code. The supported features and known issues are listed in #25.
Details
The overall architecture is very similar to the sample-language analyzer.
The JVM interpreter is based on JacoDB 3-address code, which is very similar to well-known Soot Jimple representation.
JcMachineJcMachineis an entry point of analysis, and it takes aJcClasspathas a dependency. Some varying features, like search strategy, are hard-coded for simplicity now.JcApplicationGraphJcApplicationGraphis a wrapper for JacoDB application graph, which simply delegates calls to it.JcStateJcStateextendsUStatewith aJcMethodResultfield, which represents a current result of a method execution, other components are the same.JcInterpreterJcIntepreteris very similar toSampleInterpreter, except that it isn't responsible for handling calls. It also provides an initial support for handling exceptions, but without catch blocks now.JcExprResolverJcExprResolverperforms an actual symbolic execution, handling allJcExpressions. The primitive types are handled based on their size, meaning that, e.g.charis represented by bit-vectors of 16 bits. There is a known issue inJacoDBabout incorrect types for operations with integrals likecharorshort, so some tests are disabled now.Changes in
usvm-coreUHeapRefandUSizeExpr, instead of just aUSizeExprUReadOnlyMemoryInterfaceimplemented byUMemoryBaseandUModelBaseURegistersStacka little bitUArrayLengthLValueTODO: