AgentSkillsCN

mvx_wasm_debug

通过 DWARF 对 WASM 二进制文件进行分析与调试。

SKILL.md
--- frontmatter
name: mvx_wasm_debug
description: Analyzing WASM binaries and debugging via DWARF.

MultiversX WASM Debugging

This skill helps you analyze the compiled output.wasm file.

1. Binary Size Analysis

  • •Twiggy: Use twiggy top output.wasm to see what takes up space.
  • •Bloat: Heavy JSON deserialization code? Large static strings?

2. Panic Analysis

  • •Abort Messages: By default, sc_panic! adds a string message.
  • •Optimization: wasm-opt removes these in production builds (--opt-level z).
  • •Debugging: If the contract traps with unreachable, check if it ran out of gas or hit a panic without a message.

3. DWARF Info

  • •MultiversX supports building with debug symbols (mxpy contract build --debug).
  • •This allows mapping WASM instructions back to Rust source lines in the debugger.