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Include rounding mode in XRPAmount to STAmount conversion.

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This commit is contained in:
Howard Hinnant
2022-10-19 16:00:41 -04:00
committed by Elliot Lee
parent 6fcd654bee
commit e354497f63
6 changed files with 1028 additions and 653 deletions
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4
src/ripple/basics/IOUAmount.h
View File

@@ -186,10 +186,6 @@ mulRatio(
std::uint32_t den,
bool roundUp);
// Since IOUAmount and STAmount do not have access to a ledger, this
// is needed to put low-level routines on an amendment switch. Only
// transactions need to use this switchover. Outside of a transaction
// it's safe to unconditionally use the new behavior.
extern LocalValue<bool> stNumberSwitchover;
/** RAII class to set and restore the Number switchover.

18
src/ripple/basics/Number.h
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@@ -337,6 +337,24 @@ squelch(Number const& x, Number const& limit) noexcept
return x;
}
class saveNumberRoundMode
{
Number::rounding_mode mode_;
public:
~saveNumberRoundMode()
{
Number::setround(mode_);
}
explicit saveNumberRoundMode(Number::rounding_mode mode) noexcept
: mode_{mode}
{
}
saveNumberRoundMode(saveNumberRoundMode const&) = delete;
saveNumberRoundMode&
operator=(saveNumberRoundMode const&) = delete;
};
} // namespace ripple
#endif // RIPPLE_BASICS_NUMBER_H_INCLUDED

38
src/ripple/protocol/impl/STAmount.cpp
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@@ -725,24 +725,36 @@ STAmount::canonicalize()
"Native currency amount out of range");
}
while (mOffset < 0)
if (*stNumberSwitchover && *stAmountCanonicalizeSwitchover)
{
mValue /= 10;
++mOffset;
Number num(
mIsNegative ? -mValue : mValue, mOffset, Number::unchecked{});
XRPAmount xrp{num};
mIsNegative = xrp.drops() < 0;
mValue = mIsNegative ? -xrp.drops() : xrp.drops();
mOffset = 0;
}
while (mOffset > 0)
else
{
if (*stAmountCanonicalizeSwitchover)
while (mOffset < 0)
{
// N.B. do not move the overflow check to after the
// multiplication
if (mValue > cMaxNativeN)
Throw<std::runtime_error>(
"Native currency amount out of range");
mValue /= 10;
++mOffset;
}
while (mOffset > 0)
{
if (*stAmountCanonicalizeSwitchover)
{
// N.B. do not move the overflow check to after the
// multiplication
if (mValue > cMaxNativeN)
Throw<std::runtime_error>(
"Native currency amount out of range");
}
mValue *= 10;
--mOffset;
}
mValue *= 10;
--mOffset;
}
if (mValue > cMaxNativeN)

22
src/test/app/NFToken_test.cpp
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@@ -2349,7 +2349,13 @@ class NFToken_test : public beast::unit_test::suite
// See the impact of rounding when the nft is sold for small amounts
// of drops.
for (auto NumberSwitchOver : {true})
{
if (NumberSwitchOver)
env.enableFeature(fixUniversalNumber);
else
env.disableFeature(fixUniversalNumber);
// An nft with a transfer fee of 1 basis point.
uint256 const nftID =
token::getNextID(env, alice, 0u, tfTransferable, 1);
@@ -2374,16 +2380,16 @@ class NFToken_test : public beast::unit_test::suite
// minter sells to carol. The payment is just small enough that
// alice does not get any transfer fee.
auto pmt = NumberSwitchOver ? drops(50000) : drops(99999);
STAmount carolBalance = env.balance(carol);
uint256 const minterSellOfferIndex =
keylet::nftoffer(minter, env.seq(minter)).key;
env(token::createOffer(minter, nftID, drops(99999)),
txflags(tfSellNFToken));
env(token::createOffer(minter, nftID, pmt), txflags(tfSellNFToken));
env.close();
env(token::acceptSellOffer(carol, minterSellOfferIndex));
env.close();
minterBalance += drops(99999) - fee;
carolBalance -= drops(99999) + fee;
minterBalance += pmt - fee;
carolBalance -= pmt + fee;
BEAST_EXPECT(env.balance(alice) == aliceBalance);
BEAST_EXPECT(env.balance(minter) == minterBalance);
BEAST_EXPECT(env.balance(carol) == carolBalance);
@@ -2393,13 +2399,13 @@ class NFToken_test : public beast::unit_test::suite
STAmount beckyBalance = env.balance(becky);
uint256 const beckyBuyOfferIndex =
keylet::nftoffer(becky, env.seq(becky)).key;
env(token::createOffer(becky, nftID, drops(100000)),
token::owner(carol));
pmt = NumberSwitchOver ? drops(50001) : drops(100000);
env(token::createOffer(becky, nftID, pmt), token::owner(carol));
env.close();
env(token::acceptBuyOffer(carol, beckyBuyOfferIndex));
env.close();
carolBalance += drops(99999) - fee;
beckyBalance -= drops(100000) + fee;
carolBalance += pmt - drops(1) - fee;
beckyBalance -= pmt + fee;
aliceBalance += drops(1);
BEAST_EXPECT(env.balance(alice) == aliceBalance);

1557
src/test/app/Taker_test.cpp
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File diff suppressed because it is too large Load Diff

42
src/test/basics/Number_test.cpp
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@@ -26,24 +26,6 @@
namespace ripple {
class saveNumberRoundMode
{
Number::rounding_mode mode_;
public:
~saveNumberRoundMode()
{
Number::setround(mode_);
}
explicit saveNumberRoundMode(Number::rounding_mode mode) noexcept
: mode_{mode}
{
}
saveNumberRoundMode(saveNumberRoundMode const&) = delete;
saveNumberRoundMode&
operator=(saveNumberRoundMode const&) = delete;
};
class Number_test : public beast::unit_test::suite
{
public:
@@ -580,6 +562,29 @@ public:
BEAST_EXPECT(x == y);
}
void
test_toSTAmount()
{
NumberSO stNumberSO{true};
Issue const issue;
Number const n{7'518'783'80596, -5};
saveNumberRoundMode const save{Number::setround(Number::to_nearest)};
auto res2 = STAmount{issue, n.mantissa(), n.exponent()};
BEAST_EXPECT(res2 == STAmount{7518784});
Number::setround(Number::towards_zero);
res2 = STAmount{issue, n.mantissa(), n.exponent()};
BEAST_EXPECT(res2 == STAmount{7518783});
Number::setround(Number::downward);
res2 = STAmount{issue, n.mantissa(), n.exponent()};
BEAST_EXPECT(res2 == STAmount{7518783});
Number::setround(Number::upward);
res2 = STAmount{issue, n.mantissa(), n.exponent()};
BEAST_EXPECT(res2 == STAmount{7518784});
}
void
run() override
{
@@ -599,6 +604,7 @@ public:
test_relationals();
test_stream();
test_inc_dec();
test_toSTAmount();
}
};