support full storage key space (#100)

- The storage pointer values will no longer be truncated to the register size, allowing for the use of arbitrary storage keys
- Failed storage value reads will now guarantee to return the zero value

crates/integration/codesize.json

@@ -2,9 +2,9 @@
   "Baseline": 989,
   "Computation": 4153,
   "DivisionArithmetics": 40614,
-  "ERC20": 47343,
+  "ERC20": 47348,
   "Events": 1781,
   "FibonacciIterative": 3035,
-  "Flipper": 3393,
+  "Flipper": 3448,
   "SHA1": 33553
 }

crates/integration/contracts/ERC20.sol

@@ -4,11 +4,27 @@ pragma solidity ^0.8;
 
 /* runner.json
 {
+    "differential": true,
     "actions": [
-    {
-      "Instantiate": {}
-    }
-  ]
+        {
+            "Upload": {
+                "code": {
+                    "Solidity": {
+                        "contract": "ERC20"
+                    }
+                }
+            }
+        },
+        {
+            "Instantiate": {
+                "code": {
+                    "Solidity": {
+                        "contract": "ERC20Tester"
+                    }
+                }
+            }
+        }
+    ]
 }
 */
 
@@ -82,3 +98,28 @@ contract ERC20 is IERC20 {
         emit Transfer(msg.sender, address(0), amount);
     }
 }
+
+contract ERC20Tester {
+    constructor() {
+        address BOB = address(0xffffffffffffffffffffffffffffffffffffff);
+        ERC20 token = new ERC20();
+        assert(token.decimals() == 18);
+
+        // use call directly when code_size is implemented on pallet-revive
+
+        address(token).call(abi.encodeWithSignature("mint(uint256)", 300));
+        assert(token.balanceOf(address(this)) == 300);
+        token.transfer(BOB, 100);
+        assert(token.balanceOf(address(this)) == 200);
+        assert(token.balanceOf(BOB) == 100);
+
+        token.approve(address(this), 100);
+
+        token.transferFrom(address(this), BOB, 100);
+        assert(token.balanceOf(BOB) == 200);
+        assert(token.balanceOf(address(this)) == 100);
+
+        address(token).call(abi.encodeWithSignature("burn(uint256)", 100));
+        assert(token.balanceOf(address(this)) == 0);
+    }
+}

crates/integration/contracts/Storage.sol

@@ -22,6 +22,14 @@ pragma solidity ^0.8;
                 },
                 "data": "fabc9efaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
             }
+        },
+        {
+            "Call": {
+                "dest": {
+                    "Instantiated": 0
+                },
+                "data": "558b9f9bffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+            }
         }
     ]
 }
@@ -30,10 +38,18 @@ pragma solidity ^0.8;
 contract Storage {
     function transient(uint value) public returns (uint ret) {
         assembly {
-            let slot := 123
+            let slot := 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00
             tstore(slot, value)
             let success := call(0, 0, 0, 0, 0, 0, 0)
             ret := tload(slot)
         }
     }
+
+    function persistent(uint value) public returns (uint ret) {
+        assembly {
+            let slot := 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00
+            sstore(slot, value)
+            ret := sload(slot)
+        }
+    }
 }