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test: Verify findCommonAncestor always initializes outputs

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Also add code comment to clarify surprising code noted by practicalswift
https://github.com/bitcoin/bitcoin/pull/18657#issuecomment-614278450
This commit is contained in:
Russell Yanofsky 2020-04-15 17:07:44 -04:00
parent 4bd6bc5cb4
commit 9986608ba9
2 changed files with 8 additions and 0 deletions
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2
src/interfaces/chain.cpp
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@ -275,6 +275,8 @@ public:
const CBlockIndex* block1 = LookupBlockIndex(block_hash1);
const CBlockIndex* block2 = LookupBlockIndex(block_hash2);
const CBlockIndex* ancestor = block1 && block2 ? LastCommonAncestor(block1, block2) : nullptr;
// Using & instead of && below to avoid short circuiting and leaving
// output uninitialized.
return FillBlock(ancestor, ancestor_out, lock) & FillBlock(block1, block1_out, lock) & FillBlock(block2, block2_out, lock);
}
void findCoins(std::map<COutPoint, Coin>& coins) override { return FindCoins(m_node, coins); }

6
src/test/interfaces_tests.cpp
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@ -116,6 +116,12 @@ BOOST_AUTO_TEST_CASE(findCommonAncestor)
BOOST_CHECK_EQUAL(orig_height, orig_tip->nHeight);
BOOST_CHECK_EQUAL(fork_height, orig_tip->nHeight - 10);
BOOST_CHECK_EQUAL(fork_hash, active[fork_height]->GetBlockHash());
uint256 active_hash, orig_hash;
BOOST_CHECK(!chain->findCommonAncestor(active.Tip()->GetBlockHash(), {}, {}, FoundBlock().hash(active_hash), {}));
BOOST_CHECK(!chain->findCommonAncestor({}, orig_tip->GetBlockHash(), {}, {}, FoundBlock().hash(orig_hash)));
BOOST_CHECK_EQUAL(active_hash, active.Tip()->GetBlockHash());
BOOST_CHECK_EQUAL(orig_hash, orig_tip->GetBlockHash());
}
BOOST_AUTO_TEST_CASE(hasBlocks)