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Run fundamental equation of DAI with cvl2 #4

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Run fundamental equation of DAI with cvl2 #4

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18 changes: 9 additions & 9 deletions Vat.spec
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
// Vat.spec

methods {
debt() returns (uint256) envfree
vice() returns (uint256) envfree
function debt() external returns (uint256) envfree;
function vice() external returns (uint256) envfree;
}

ghost sumOfVaultDebtGhost() returns uint256 {
Expand All @@ -17,24 +17,24 @@ ghost mapping(bytes32 => uint256) ArtGhost {
init_state axiom forall bytes32 ilk. ArtGhost[ilk] == 0;
}

hook Sload uint256 v currentContract.ilks[KEY bytes32 ilk].(offset 0) STORAGE {
hook Sload uint256 v currentContract.ilks[KEY bytes32 ilk].(offset 0) {
require ArtGhost[ilk] == v;
}

hook Sstore currentContract.ilks[KEY bytes32 ilk].(offset 0) uint256 newArt (uint256 oldArt) STORAGE {
havoc sumOfVaultDebtGhost assuming sumOfVaultDebtGhost@new() == sumOfVaultDebtGhost@old() + (newArt * rateGhost[ilk]) - (oldArt * rateGhost[ilk]);
hook Sstore currentContract.ilks[KEY bytes32 ilk].(offset 0) uint256 newArt (uint256 oldArt) {
havoc sumOfVaultDebtGhost assuming sumOfVaultDebtGhost@new() == assert_uint256(sumOfVaultDebtGhost@old() + (newArt * rateGhost[ilk]) - (oldArt * rateGhost[ilk]));
ArtGhost[ilk] = newArt;
}

hook Sload uint256 v currentContract.ilks[KEY bytes32 ilk].(offset 32) STORAGE {
hook Sload uint256 v currentContract.ilks[KEY bytes32 ilk].(offset 32) {
require rateGhost[ilk] == v;
}

hook Sstore currentContract.ilks[KEY bytes32 ilk].(offset 32) uint256 newRate (uint256 oldRate) STORAGE {
havoc sumOfVaultDebtGhost assuming sumOfVaultDebtGhost@new() == sumOfVaultDebtGhost@old() + (ArtGhost[ilk] * newRate) - (ArtGhost[ilk] * oldRate);
hook Sstore currentContract.ilks[KEY bytes32 ilk].(offset 32) uint256 newRate (uint256 oldRate) {
havoc sumOfVaultDebtGhost assuming sumOfVaultDebtGhost@new() == assert_uint256(sumOfVaultDebtGhost@old() + (ArtGhost[ilk] * newRate) - (ArtGhost[ilk] * oldRate));
rateGhost[ilk] = newRate;
}

invariant fundamental_equation_of_dai()
debt() == vice() + sumOfVaultDebtGhost()
debt() == assert_uint256(vice() + sumOfVaultDebtGhost())
filtered { f -> !f.isFallback }