Inspect IL to locate value-type struct copies and map them to source lines.
npx skills add https://github.com/JeremyKuhne/touki --skill il-copy-inspection
Please help me install this Agent Skill. Skill: il-copy-inspection Source: https://github.com/JeremyKuhne/touki/tree/main/.agents/skills/il-copy-inspection Command: npx skills add https://github.com/JeremyKuhne/touki --skill il-copy-inspection
Find how the compiler emits copies of value-type structs in IL, including defensive copies and boxing, to ground-truth compiler behavior beyond source code.
Inspect the IL of a method to locate where a struct is copied during a call
High-intent search queries and answers about installing and using this skill.
Detect defensive copies of structs in IL by inspecting compiled method bodies with tools like ilspycmd or ildasm to locate copy opcodes such as ldobj, stobj, and cpobj, then mapping those IL offsets back to the original C# source lines using a portable PDB.
The C# compiler emits a defensive copy on a readonly struct field to preserve value-type semantics when invoking methods, creating a hidden copy in the IL that is not visible at the source level and can be verified by inspecting the method body.
Inspect IL opcodes for struct boxing and copies by disassembling the compiled assembly using Mono.Cecil or System.Reflection.Metadata to identify box, unbox.any, and ldfld instructions, revealing the exact compiler behavior applied to value types.
Yes, you need a portable PDB to map IL copies to C# source lines because it provides the sequence point data required to correlate the detected IL copy opcodes with their exact locations in the original C# methods.
Yes, you can use ilspycmd to verify in parameter struct modifications in IL by disassembling the compiled assembly and examining the emitted opcodes to determine if the compiler generated hidden defensive copies during the method call.
The IL opcodes that indicate a value-type struct has been copied include ldobj, stobj, cpobj, box, unbox.any, and ldfld for value types, which collectively reveal defensive copies and boxing operations emitted by the compiler.
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