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WIP: add Wasmi translation invariants checker #1233

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@Robbepop Robbepop commented Oct 8, 2024

Closes #1209.

Post-Conditions

  • All registers of all instructions of a translated function are valid.
    • In particular register in the preservation space are properly defragmented.
  • All function, table, memory and global indices are valid for the given ModuleHeader and Engine.
  • If consume_fuel is enabled, no BranchOffset[16]s may be 0.
  • If consume_fuel is enabled, all BranchOffset[16]s that jump backwards must target a ConsumeFuel instruction.
  • All ConsumeFuel instructions must consume at least 1 fuel.
  • All BranchOffset[16]s must have valid jump destinations within the same function.
  • All (conditional) return instructions must return the same number as the number of results of the translated function.
  • For all instructions with parameter instructions, check if they are properly encoded in sequence.

@Robbepop Robbepop force-pushed the rf-translation-post-conditions branch from 939ee56 to 880f917 Compare October 11, 2024 10:59
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codecov bot commented Oct 11, 2024

Codecov Report

Attention: Patch coverage is 27.73109% with 172 lines in your changes missing coverage. Please review.

Project coverage is 81.07%. Comparing base (1aa2256) to head (b4daaca).
Report is 1 commits behind head on main.

Files with missing lines Patch % Lines
crates/wasmi/src/engine/translator/conditions.rs 26.81% 161 Missing ⚠️
crates/wasmi/src/module/mod.rs 0.00% 8 Missing ⚠️
crates/wasmi/src/engine/translator/stack/mod.rs 0.00% 2 Missing ⚠️
crates/wasmi/src/engine/translator/mod.rs 66.66% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #1233      +/-   ##
==========================================
- Coverage   81.58%   81.07%   -0.51%     
==========================================
  Files         306      307       +1     
  Lines       25270    25506     +236     
==========================================
+ Hits        20616    20680      +64     
- Misses       4654     4826     +172     

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Add debug post-conditions for Wasmi translation
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