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authorobscuren <geffobscura@gmail.com>2015-06-18 18:25:02 +0800
committerobscuren <geffobscura@gmail.com>2015-06-18 18:25:02 +0800
commit430bcdb21959e018fbc93bac0ccd8bbfa2fd5afb (patch)
tree27cf31245ff3360432582666e1d894ee14c4463f /core/vm
parent15e169e5b6566b77aba23cc04c2f19a94ff23738 (diff)
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core/vm: clarified SSTORE
Diffstat (limited to 'core/vm')
-rw-r--r--core/vm/vm.go12
1 files changed, 5 insertions, 7 deletions
diff --git a/core/vm/vm.go b/core/vm/vm.go
index 336f6cf95..9e092300d 100644
--- a/core/vm/vm.go
+++ b/core/vm/vm.go
@@ -686,6 +686,11 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
var g *big.Int
y, x := stack.data[stack.len()-2], stack.data[stack.len()-1]
val := statedb.GetState(context.Address(), common.BigToHash(x))
+
+ // This checks for 3 scenario's and calculates gas accordingly
+ // 1. From a zero-value address to a non-zero value (NEW VALUE)
+ // 2. From a non-zero value address to a zero-value address (DELETE)
+ // 3. From a nen-zero to a non-zero (CHANGE)
if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
// 0 => non 0
g = params.SstoreSetGas
@@ -697,13 +702,6 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
// non 0 => non 0 (or 0 => 0)
g = params.SstoreClearGas
}
-
- /*
- if len(val) == 0 && len(y.Bytes()) > 0 {
- } else if len(val) > 0 && len(y.Bytes()) == 0 {
- } else {
- }
- */
gas.Set(g)
case SUICIDE:
if !statedb.IsDeleted(context.Address()) {