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core/vm: added opSwapN,Exchange,DupN opcodes

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This commit is contained in:
Marius van der Wijden 2024-09-26 13:47:17 +02:00
parent 3012db54ee
commit 5bd220b2f0
2 changed files with 31 additions and 3 deletions
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26
core/vm/eof_instructions.go
View file

@ -78,17 +78,37 @@ func opDataCopy(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([
// opDupN implements the DUPN opcode
func opDupN(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
panic("not implemented")
var (
code = scope.Contract.CodeAt(scope.CodeSection)
index = int(code[*pc+1]) + 1
)
scope.Stack.dup(index)
*pc += 1 // move past immediate
return nil, nil
}
// opSwapN implements the SWAPN opcode
func opSwapN(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
panic("not implemented")
var (
code = scope.Contract.CodeAt(scope.CodeSection)
index = int(code[*pc+1]) + 1
)
scope.Stack.swap(index + 1)
*pc += 1 // move past immediate
return nil, nil
}
// opExchange implements the EXCHANGE opcode
func opExchange(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
panic("not implemented")
var (
code = scope.Contract.CodeAt(scope.CodeSection)
index = int(code[*pc+1])
n = (index >> 4) + 1
m = (index & 0x0F) + 1
)
scope.Stack.swapN(n+1, n+m+1)
*pc += 1 // move past immediate
return nil, nil
}
// opReturnDataLoad implements the RETURNDATALOAD opcode

8
core/vm/stack.go
View file

@ -113,6 +113,14 @@ func (st *Stack) swap16() {
st.data[st.len()-17], st.data[st.len()-1] = st.data[st.len()-1], st.data[st.len()-17]
}
func (st *Stack) swap(n int) {
st.swapN(n, 1)
}
func (st *Stack) swapN(n, m int) {
st.data[st.len()-n], st.data[st.len()-m] = st.data[st.len()-m], st.data[st.len()-n]
}
func (st *Stack) dup(n int) {
st.push(&st.data[st.len()-n])
}