git ssb

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const opcodes = require('./opcodes.js')
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/**
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 * Debug Interface
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 * This expose some functions that can help with debugging wast
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 */
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// This is ASCII only
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function Uint8ArrayToString (input) {
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  return String.fromCharCode.apply(null, input)
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}
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function Uint8ArrayToHexString (input) {
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  return new Buffer(input).toString('hex')
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}
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module.exports = class DebugInterface {
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  setModule (mod) {
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    this.module = mod
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  }
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  get exportTable () {
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    return {
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      'print': function (offset = 0, length = 100) {
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        console.log(`<DEBUG(str): ${Uint8ArrayToString(new Uint8Array(this.module.exports.memory, offset, length))}>`)
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      }.bind(this),
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      'printHex': function (offset = 0, length = 100) {
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        console.log(`<DEBUG(hex): ${Uint8ArrayToHexString(new Uint8Array(this.module.exports.memory, offset, length))}>`)
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      }.bind(this),
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      'stackTrace': function (sp, op) {
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        const opcode = opcodes(op)
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        if (opcode.number) {
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          opcode.name += opcode.number
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        }
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        console.error(opcode.name)
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        console.log('-------------stack--------------')
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        for (let i = sp; i > 0; i -= 32) {
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          console.log(`${(sp - i) / 32} ${Uint8ArrayToHexString(new Uint8Array(this.module.exports.memory, i - 24, 32))}`)
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        }
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        return sp
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      }.bind(this)
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    }
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  }
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}
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