bug(tracing): Forge test do not show decoded events when emitting events using inline assembly

[thepluck]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge Version: 1.0.0-v1.0.0

What version of Foundryup are you on?

foundryup: 1.1.0

What command(s) is the bug in?

forge test

Operating System

None

Describe the bug

I used the below snippet to emit events:

  event Exchange(bytes swapResult);

  function emitExchange(
    address pool,
    address tokenIn,
    address tokenOut,
    uint256 amountIn,
    uint256 amountOut
  ) internal {
    assembly ("memory-safe") {
      // Get a pointer to some free memory.
      let fmp := mload(0x40)

      // Write the data into memory in reverse order because we are packing it into 92 bytes.
      // We will use 32 + 20 + 20 + 16 + 16 = 104 bytes of memory.
      mstore(add(fmp, 72), amountOut) // 104 - 32 = 72
      mstore(add(fmp, 56), amountIn) // 72 - 16 = 56
      mstore(add(fmp, 40), tokenOut) // 56 - 16 = 40
      mstore(add(fmp, 20), tokenIn) // 40 - 20 = 20
      mstore(fmp, pool) // 20 - 20 = 0

      // Emit the event.
      // The actual data is starting from fmp + 12
      log1(add(fmp, 12), 92, EXCHANGE_EVENT_SELECTOR)

      // Now clean the memory we used
      mstore(fmp, 0)
      mstore(add(fmp, 0x20), 0)
      mstore(add(fmp, 0x40), 0)
      mstore(add(fmp, 0x60), 0)
    }
  }

When running tests, instead of showing emit Exchange(...), it showed:

And for some places, it showed:

I checked the logs from the test transaction using vm.recordLogs and confirmed that all the logs are correct.

[grandizzy]

@thepluck this is an internal fn, wonder if you run with dynamic test linking on? could you share all the project settings to repro?

[grandizzy]

nm, was able to repro with a simple test, will look into

[thepluck]

That is an internal function of a contract