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EIP-210: Fixes for blockhash contracts (#1094) 

* EIP-210: Fix blockhash contract for block number 1

This fixes the issue in the contract when executed from SYSTEM account at block 1. Then the number of the previous block is 0 and the contract executes the loop forever.

* EIP-210: Correctly handle argument with negative value

Fix fixes the issue in the blockhash contract where the negative value of the argument is not properly handled.
This commit is contained in:
Paweł Bylica 2018-10-15 13:33:05 +02:00 committed by Nick Johnson
parent 7ceb961c3e
commit e58c4d5d60
1 changed files with 4 additions and 4 deletions
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EIPS/eip-210.md
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@ -49,13 +49,13 @@ The Serpent source code is:
with offset = 0:
if msg.sender == 0xfffffffffffffffffffffffffffffffffffffffe:
with bn = block.number - 1:
while 1:
while bn:
~sstore(offset + ~mod(bn, 256), ~calldataload(0))
if ~mod(bn, 256):
~stop()
bn = ~div(bn, 256)
offset += 256
elif ~calldataload(0) < block.number:
elif ~calldataload(0) >= 0 and ~calldataload(0) < block.number:
with tbn = ~calldataload(0):
with dist_minus_one = block.number - tbn - 1:
while dist_minus_one >= 256 && ~mod(tbn, 256) == 0:
@ -72,13 +72,13 @@ with offset = 0:
The EVM init code is:
```
0x6100e28061000e6000396100f056600073fffffffffffffffffffffffffffffffffffffffe33141561005957600143035b60011561005357600035610100820683015561010081061561004057005b6101008104905061010082019150610022565b506100e0565b4360003512156100d4576000356001814303035b61010081121515610085576000610100830614610088565b60005b156100a75761010083019250610100820491506101008104905061006d565b610100811215156100bd57600060a052602060a0f35b610100820683015460c052602060c0f350506100df565b600060e052602060e0f35b5b505b6000f3
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
```
The EVM bytecode that the contract code should be set to is:
```
0x600073fffffffffffffffffffffffffffffffffffffffe33141561005957600143035b60011561005357600035610100820683015561010081061561004057005b6101008104905061010082019150610022565b506100e0565b4360003512156100d4576000356001814303035b61010081121515610085576000610100830614610088565b60005b156100a75761010083019250610100820491506101008104905061006d565b610100811215156100bd57600060a052602060a0f35b610100820683015460c052602060c0f350506100df565b600060e052602060e0f35b5b50
0x600073fffffffffffffffffffffffffffffffffffffffe33141561005857600143035b801561005257600035610100820683015561010081061561003f57005b6101008104905061010082019150610022565b506100f3565b600060003512151561006e574360003512610071565b60005b156100e7576000356001814303035b6101008112151561009857600061010083061461009b565b60005b156100ba57610100830192506101008204915061010081049050610080565b610100811215156100d057600060a052602060a0f35b610100820683015460c052602060c0f350506100f2565b600060e052602060e0f35b5b50
```
### Rationale