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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module.exports = class DebugInterface {
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  constructor (kernel) {
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    this.kernel = kernel
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  }
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  static get name () {
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    return 'debug'
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  }
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  get exports () {
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    return {
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      'print': function (a) {
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        console.log(a)
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      },
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      'printMem': function (offset, length) {
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        console.log(`<DEBUG(str): ${this.getMemoryBuffer(offset, length).toString()}>`)
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      }.bind(this),
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      'printMemHex': function (offset, length) {
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        console.log(`<DEBUG(hex): ${this.getMemoryBuffer(offset, length).toString('hex')}>`)
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      }.bind(this),
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      'evmStackTrace': 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(`op: ${opcode.name} gas: ${this.kernel.environment.gasLeft} sp: ${sp}`)
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        console.log('-------------stack--------------')
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        for (let i = sp; i >= 0; i -= 32) {
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          console.log(`${(sp - i) / 32} ${this.getMemoryBuffer(i).toString('hex')}`)
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        }
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      }.bind(this)
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    }
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  }
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  getMemoryBuffer (offset, length = 32) {
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    const mem = this.kernel.memory.slice(offset, offset + length)
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    return Buffer.from(mem).reverse()
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  }
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}
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