Wasm build does not output panics to the JSON `errors` array

[elle-j]

Description

In --standard-json mode, when a panic occurs in resolc the native builds are consistent with solc and terminate in a success state with errors reported in the JSON output via stdout.

The Wasm build behaves similarly for errors, but not when panics occur:

Build	Exit Code	stdout	stderr
Native	0	JSON with populated errors array	empty
Wasm	101	empty	panic message

Tested with:

• resolc 1.0.0
• resolc 0.6.0

Minimal Reproduction

1. Create a file that triggers a panic

This example uses the _ function naming collision bug to trigger a panic:

cat > trigger-ice.yul << 'EOF'
object "Test" {
    code {
        {
            let size := datasize("Test_deployed")
            codecopy(0, dataoffset("Test_deployed"), size)
            return(0, size)
        }
    }
    object "Test_deployed" {
        code {
            {
                _()
                log0(0, 32)
            }
            function _() {
                mstore(0, 0xdeadbeef)
                log0(0, 32)
            }
        }
    }
}
EOF

2. Download soljson.js

This downloads it to resolc-wasm/soljson.js:

curl -sSLo resolc-wasm/soljson.js https://github.com/ethereum/solidity/releases/download/v0.8.33/soljson.js

3. Compile the file with Wasm resolc

This assumes you have resolc.js, resolc.wasm, and soljson.js in ./resolc-wasm/:
(resolc v1.0.0 used here)

node -e "
const fs = require('fs');
const createResolc = require('./resolc-wasm/resolc.js');
const soljson = require('./resolc-wasm/soljson.js');

const input = {
  language: 'Yul',
  sources: {
    'trigger-ice.yul': {
      content: fs.readFileSync('trigger-ice.yul', 'utf8')
    }
  },
  settings: {
    optimizer: {
      enabled: false
    },
    outputSelection: {
      '*': {
        '*': ['evm.bytecode']
      }
    }
  }
};

const compiler = createResolc();
compiler.soljson = soljson;
compiler.writeToStdin(JSON.stringify(input));

const exitCode = compiler.callMain(['--standard-json']);

console.log('Exit code:', exitCode);
console.log('stdout:');
console.log(compiler.readFromStdout());
console.log('stderr:');
console.log(compiler.readFromStderr());
"

Expected Output

• Exit code: 0
• stdout: JSON with the error in the errors array
• stderr: empty

Actual Output

Exit code: 101
stdout:

stderr:

thread 'main' (1) panicked at crates/resolc/src/process/worker_process.rs:91:37:
Worker error: 
thread 'main' (1) panicked at crates/llvm-context/src/polkavm/context/mod.rs:459:9:
ICE: function '_' declared subsequentally