runtimeverification / runtimeverification/wasm-semantics
`call` causes state splitting
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- Dominant language
- WebAssembly
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- 106
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Description
The below screenshot of the execution graph in the Haskell backend shows the splitting at axiom 112, which is call. The splitting occurs in node 94 and 111.
This is when calling the "main" function of wrc20 after the module has been loaded.
Axiom 112
Kore (95)> axiom 112
\rewrites{SortGeneratedTopCell{}}(
\and{SortGeneratedTopCell{}}(
\top{SortGeneratedTopCell{}}(),
Lbl'-LT-'generatedTop'-GT-'{}(
Lbl'-LT-'ewasm'-GT-'{}(
Var'Unds'23:SortEeiCell{},
Lbl'-LT-'wasm'-GT-'{}(
Lbl'-LT-'k'-GT-'{}(
kseq{}(
/* Inj: */ inj{SortPlainInstr{}, SortKItem{}}(
Lblcall'UndsUnds'WASM'Unds'PlainInstr'Unds'Index{}(
VarTFIDX:SortIndex{}
)
),
VarDotVar3:SortK{}
)
),
Var'Unds'16:SortValstackCell{},
Lbl'-LT-'curFrame'-GT-'{}(
Var'Unds'0:SortLocalsCell{},
Var'Unds'1:SortLocalIdsCell{},
Lbl'-LT-'curModIdx'-GT-'{}(
/* Inj: */ inj{SortInt{}, SortOptionalInt{}}(
VarCUR:SortInt{}
)
),
Var'Unds'2:SortLabelDepthCell{},
Var'Unds'3:SortLabelIdsCell{}
),
Var'Unds'17:SortModuleRegistryCell{},
Var'Unds'18:SortModuleIdsCell{},
Lbl'-LT-'moduleInstances'-GT-'{}(
/* builtin: */
Lbl'Unds'ModuleInstCellMap'Unds'{}(
/* element: */ LblModuleInstCellMapItem{}(
Lbl'-LT-'modIdx'-GT-'{}(VarCUR:SortInt{}),
Lbl'-LT-'moduleInst'-GT-'{}(
Lbl'-LT-'modIdx'-GT-'{}(VarCUR:SortInt{}),
Var'Unds'4:SortExportsCell{},
Var'Unds'5:SortTypeIdsCell{},
Var'Unds'6:SortTypesCell{},
Var'Unds'7:SortNextTypeIdxCell{},
Lbl'-LT-'funcIds'-GT-'{}(VarIDS:SortMap{}),
Lbl'-LT-'funcAddrs'-GT-'{}(
/* builtin: */
Lbl'Unds'Map'Unds'{}(
/* element: */ Lbl'UndsPipe'-'-GT-Unds'{}(
/* Inj: */ inj{SortInt{}, SortKItem{}}(
Lbl'Hash'ContextLookup'LParUndsCommUndsRParUnds'WASM-DATA'Unds'Int'Unds'Map'Unds'Index{}(
VarIDS:SortMap{},
VarTFIDX:SortIndex{}
)
),
/* Inj: */ inj{SortInt{}, SortKItem{}}(
VarFADDR:SortInt{}
)
),
/* opaque child: */ VarDotVar7:SortMap{}
)
),
Var'Unds'8:SortNextFuncIdxCell{},
Var'Unds'9:SortTabIdsCell{},
Var'Unds'10:SortTabAddrsCell{},
Var'Unds'11:SortMemIdsCell{},
Var'Unds'12:SortMemAddrsCell{},
Var'Unds'13:SortGlobIdsCell{},
Var'Unds'14:SortGlobalAddrsCell{},
Var'Unds'15:SortNextGlobIdxCell{}
)
),
/* opaque child: */ VarDotVar5:SortModuleInstCellMap{}
)
),
Var'Unds'19:SortNextModuleIdxCell{},
Var'Unds'20:SortMainStoreCell{},
Var'Unds'21:SortDeterministicMemoryGrowthCell{},
Var'Unds'22:SortNextFreshIdCell{}
),
Var'Unds'24:SortParamstackCell{}
),
VarDotVar0:SortGeneratedCounterCell{}
)
),
\and{SortGeneratedTopCell{}}(
\top{SortGeneratedTopCell{}}(),
Lbl'-LT-'generatedTop'-GT-'{}(
Lbl'-LT-'ewasm'-GT-'{}(
Var'Unds'23:SortEeiCell{},
Lbl'-LT-'wasm'-GT-'{}(
Lbl'-LT-'k'-GT-'{}(
kseq{}(
/* Inj: */ inj{SortInstr{}, SortKItem{}}(
Lbl'LPar'invoke'UndsRParUnds'WASM'Unds'Instr'Unds'Int{}(
VarFADDR:SortInt{}
)
),
VarDotVar3:SortK{}
)
),
Var'Unds'16:SortValstackCell{},
Lbl'-LT-'curFrame'-GT-'{}(
Var'Unds'0:SortLocalsCell{},
Var'Unds'1:SortLocalIdsCell{},
Lbl'-LT-'curModIdx'-GT-'{}(
/* Inj: */ inj{SortInt{}, SortOptionalInt{}}(
VarCUR:SortInt{}
)
),
Var'Unds'2:SortLabelDepthCell{},
Var'Unds'3:SortLabelIdsCell{}
),
Var'Unds'17:SortModuleRegistryCell{},
Var'Unds'18:SortModuleIdsCell{},
Lbl'-LT-'moduleInstances'-GT-'{}(
/* builtin: */
Lbl'Unds'ModuleInstCellMap'Unds'{}(
/* element: */ LblModuleInstCellMapItem{}(
Lbl'-LT-'modIdx'-GT-'{}(VarCUR:SortInt{}),
Lbl'-LT-'moduleInst'-GT-'{}(
Lbl'-LT-'modIdx'-GT-'{}(VarCUR:SortInt{}),
Var'Unds'4:SortExportsCell{},
Var'Unds'5:SortTypeIdsCell{},
Var'Unds'6:SortTypesCell{},
Var'Unds'7:SortNextTypeIdxCell{},
Lbl'-LT-'funcIds'-GT-'{}(VarIDS:SortMap{}),
Lbl'-LT-'funcAddrs'-GT-'{}(
/* builtin: */
Lbl'Unds'Map'Unds'{}(
/* element: */ Lbl'UndsPipe'-'-GT-Unds'{}(
/* Inj: */ inj{SortInt{}, SortKItem{}}(
Lbl'Hash'ContextLookup'LParUndsCommUndsRParUnds'WASM-DATA'Unds'Int'Unds'Map'Unds'Index{}(
VarIDS:SortMap{},
VarTFIDX:SortIndex{}
)
),
/* Inj: */ inj{SortInt{}, SortKItem{}}(
VarFADDR:SortInt{}
)
),
/* opaque child: */ VarDotVar7:SortMap{}
)
),
Var'Unds'8:SortNextFuncIdxCell{},
Var'Unds'9:SortTabIdsCell{},
Var'Unds'10:SortTabAddrsCell{},
Var'Unds'11:SortMemIdsCell{},
Var'Unds'12:SortMemAddrsCell{},
Var'Unds'13:SortGlobIdsCell{},
Var'Unds'14:SortGlobalAddrsCell{},
Var'Unds'15:SortNextGlobIdxCell{}
)
),
/* opaque child: */ VarDotVar5:SortModuleInstCellMap{}
)
),
Var'Unds'19:SortNextModuleIdxCell{},
Var'Unds'20:SortMainStoreCell{},
Var'Unds'21:SortDeterministicMemoryGrowthCell{},
Var'Unds'22:SortNextFreshIdCell{}
),
Var'Unds'24:SortParamstackCell{}
),
VarDotVar0:SortGeneratedCounterCell{}
)
)
)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the execution graph for calling the "main" function of wrc20 after the module is loaded in the Haskell backend. Inspect axiom 112 and nodes 94 and 111, comparing the call reduction with the resulting invoke state. Done means the unintended state splitting is explained and the call execution behaves as intended.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- haskell, wasm
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100