Implement EIP1380 (call self) in aleth-interpreter

ethereum · Oct 3, 2019 · 1c05d84 · 1c05d84
1 parent 33cc6cc
commit 1c05d84
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Showing 2 changed files with 8 additions and 3 deletions.
diff --git a/libaleth-interpreter/VM.h b/libaleth-interpreter/VM.h
@@ -42,6 +42,7 @@ struct VMSchedule
     static constexpr int64_t valueTransferGas = 9000;
     static constexpr int64_t callStipend = 2300;
     static constexpr int64_t callNewAccount = 25000;
+    static constexpr int64_t callSelfGas = 40;
 };
 
 class VM

diff --git a/libaleth-interpreter/VMCalls.cpp b/libaleth-interpreter/VMCalls.cpp
@@ -190,7 +190,13 @@ void VM::caseCall()
 
 bool VM::caseCallSetup(evmc_message& o_msg, bytesRef& o_output)
 {
-    m_runGas = m_rev >= EVMC_TANGERINE_WHISTLE ? 700 : 40;
+    evmc_address const destination = toEvmC(asAddress(m_SP[1]));
+
+    // Check for call-to-self (eip1380) and adjust gas accordingly
+    if (fromEvmC(m_message->destination) == fromEvmC(destination) && m_rev >= EVMC_BERLIN)
+        m_runGas = VMSchedule::callSelfGas;
+    else
+        m_runGas = evmc_get_instruction_metrics_table(m_rev)[static_cast<size_t>(m_OP)].gas_cost;
 
     switch (m_OP)
     {
@@ -212,8 +218,6 @@ bool VM::caseCallSetup(evmc_message& o_msg, bytesRef& o_output)
 
     bool const haveValueArg = m_OP == Instruction::CALL || m_OP == Instruction::CALLCODE;
 
-    evmc_address destination = toEvmC(asAddress(m_SP[1]));
-
     if (m_OP == Instruction::CALL && (m_SP[2] > 0 || m_rev < EVMC_SPURIOUS_DRAGON) &&
         !m_context->host->account_exists(m_context, &destination))
     {