40 lines
2.3 KiB
Markdown
40 lines
2.3 KiB
Markdown
# Speculative Execution Engine (Shell Script Symbolic Execution)
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## Module
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Scanner
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## Status
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VERIFIED
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## Description
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Symbolic execution engine for shell scripts that enumerates all possible execution paths through entrypoint scripts (Dockerfile CMD/ENTRYPOINT), tracking symbolic variable states and branch conditions to determine all reachable terminal states with confidence scoring.
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## Implementation Details
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- **Symbolic Executor**:
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- `src/Scanner/__Libraries/StellaOps.Scanner.EntryTrace/Speculative/ShellSymbolicExecutor.cs` - `ShellSymbolicExecutor` performing symbolic execution of shell scripts, tracking variable states and branch conditions
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- `src/Scanner/__Libraries/StellaOps.Scanner.EntryTrace/Speculative/ISymbolicExecutor.cs` - Interface for symbolic execution
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- **Execution Tree**:
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- `src/Scanner/__Libraries/StellaOps.Scanner.EntryTrace/Speculative/ExecutionTree.cs` - `ExecutionTree` representing all possible execution paths through the script with terminal states
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- **Path Analysis**:
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- `src/Scanner/__Libraries/StellaOps.Scanner.EntryTrace/Speculative/PathEnumerator.cs` - `PathEnumerator` enumerating all possible execution paths through branch conditions
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- `src/Scanner/__Libraries/StellaOps.Scanner.EntryTrace/Speculative/PathConfidenceScorer.cs` - `PathConfidenceScorer` scoring each path's likelihood based on branch conditions and variable constraints
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## E2E Test Plan
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- [ ] Execute symbolic analysis on a Dockerfile ENTRYPOINT shell script with conditional branches and verify all possible execution paths are enumerated
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- [ ] Verify the execution tree correctly tracks symbolic variable states through assignment and substitution
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- [ ] Verify branch conditions (if/else, case/esac) create appropriate path forks in the execution tree
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- [ ] Verify `PathConfidenceScorer` assigns higher confidence to paths with fewer conditional dependencies
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- [ ] Verify the engine handles common shell constructs (loops, subshells, command substitution, environment variable expansion)
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- [ ] Verify terminal states include the final command that would be executed in each path
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---
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## Verification
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| Check | Result |
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|-------|--------|
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| Tier 0 - Source files exist | PASS |
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| Tier 1 - Build + code review | PASS |
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| Tier 2 - Integration tests | PASS |
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| Verified | 2026-02-13T18:10:00Z |
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