From 90f890bb90f97d8b035bd9533603bf92f392a36d Mon Sep 17 00:00:00 2001
From: Lane Rettig <lanerettig@gmail.com>
Date: Sun, 17 Jun 2018 20:00:22 -0400
Subject: [PATCH] Begin juno implementation

Tie together the software packages (py-evm, juno, pywasm) and test
detecting WASM code and passing data and receiving data. One
stEWASMtests test (`useGas`) is passing so data is flowing in both
directions.
---
 .gitignore            |  1 +
 evm/vm/computation.py | 32 +++++++++++++++++++-------------
 setup.py              |  1 +
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/.gitignore b/.gitignore
index 5114dae242..545b053f54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -69,3 +69,4 @@ monkeytype.sqlite3
 
 # pyenv
 .python-version
+.idea
diff --git a/evm/vm/computation.py b/evm/vm/computation.py
index 608a234391..e26534bc5e 100644
--- a/evm/vm/computation.py
+++ b/evm/vm/computation.py
@@ -3,6 +3,7 @@
     abstractmethod
 )
 import itertools
+from juno import juno_execute
 import logging
 from typing import (  # noqa: F401
     Any,
@@ -537,20 +538,25 @@ def apply_computation(cls,
                 computation.precompiles[message.code_address](computation)
                 return computation
 
-            for opcode in computation.code:
-                opcode_fn = computation.get_opcode_fn(opcode)
+            # Hand off execution of WASM code
+            if computation.code[0:8] == b'\x00asm\x01\x00\x00\x00':
+                juno_execute(state, message, transaction_context, computation)
 
-                computation.logger.trace(
-                    "OPCODE: 0x%x (%s) | pc: %s",
-                    opcode,
-                    opcode_fn.mnemonic,
-                    max(0, computation.code.pc - 1),
-                )
-
-                try:
-                    opcode_fn(computation=computation)
-                except Halt:
-                    break
+            else:
+                for opcode in computation.code:
+                    opcode_fn = computation.get_opcode_fn(opcode)
+
+                    computation.logger.trace(
+                        "OPCODE: 0x%x (%s) | pc: %s",
+                        opcode,
+                        opcode_fn.mnemonic,
+                        max(0, computation.code.pc - 1),
+                    )
+
+                    try:
+                        opcode_fn(computation=computation)
+                    except Halt:
+                        break
         return computation
 
     #
diff --git a/setup.py b/setup.py
index 27168a2c66..a491d0d66f 100644
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,7 @@
         "eth-bloom>=1.0.0,<2.0.0",
         "eth-utils>=1.0.1,<2.0.0",
         "eth-typing>=1.0.0,<2.0.0",
+        "juno>=0.1.0",
         "pyethash>=0.1.27,<1.0.0",
         "py-ecc>=1.4.2,<2.0.0",
         "rlp>=1.0.1,<2.0.0",