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Add classification of EVM instructions (op_kind) #173

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Add classification of EVM instructions (op_kind) #173

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205032c
Add classification of EVM instructions (op_kind)
chfast Sep 11, 2019
1fa0dbd
Use instruction classification is the analysis loop
chfast Sep 11, 2019
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28 changes: 8 additions & 20 deletions lib/evmone/analysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -77,19 +77,12 @@ code_analysis analyze(evmc_revision rev, const uint8_t* code, size_t code_size)

auto& instr = analysis.instrs.back();

bool is_terminator = false; // A flag whenever this is a block terminating instruction.
switch (opcode)
switch (opcode_info.kind)
{
case OP_JUMP:
case OP_JUMPI:
case OP_STOP:
case OP_RETURN:
case OP_REVERT:
case OP_SELFDESTRUCT:
is_terminator = true;
default:
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I'd say explicit cases here would more clearly show the intention

Suggested change
default:
op_kind::regular:
op_kind::terminator:

break;

case ANY_SMALL_PUSH:
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Can ANY_SMALL_PUSH and ANY_LARGE_PUSH definitions be deleted now?

case op_kind::small_push:
{
const auto push_size = size_t(opcode - OP_PUSH1 + 1);
const auto push_end = code_pos + push_size;
Expand All @@ -104,7 +97,7 @@ code_analysis analyze(evmc_revision rev, const uint8_t* code, size_t code_size)
break;
}

case ANY_LARGE_PUSH:
case op_kind::large_push:
{
const auto push_size = size_t(opcode - OP_PUSH1 + 1);
const auto push_end = code_pos + push_size;
Expand All @@ -130,23 +123,18 @@ code_analysis analyze(evmc_revision rev, const uint8_t* code, size_t code_size)
break;
}

case OP_GAS:
case OP_CALL:
case OP_CALLCODE:
case OP_DELEGATECALL:
case OP_STATICCALL:
case OP_CREATE:
case OP_CREATE2:
case op_kind::gas_counter_access:
instr.arg.number = block.gas_cost;
break;

case OP_PC:
case op_kind::pc:
instr.arg.number = static_cast<int>(code_pos - code - 1);
break;
}

// If this is a terminating instruction or the next instruction is a JUMPDEST.
if (is_terminator || (code_pos != code_end && *code_pos == OP_JUMPDEST))
if (opcode_info.kind == op_kind::terminator ||
(code_pos != code_end && *code_pos == OP_JUMPDEST))
{
// Save current block.
const auto stack_req = block.stack_req <= stack_req_max ?
Expand Down
13 changes: 13 additions & 0 deletions lib/evmone/analysis.hpp
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Expand Up @@ -170,13 +170,26 @@ enum intrinsic_opcodes
OPX_BEGINBLOCK = OP_JUMPDEST
};

/// Defines classification of EVM instructions.
enum class op_kind
{
regular, ///< Totally uninteresting instruction.
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😆

terminator, ///< Terminator instruction.
small_push, ///< Push instruction up to 8 bytes of value.
large_push, ///< Push instruction with more than 8 bytes of value.
gas_counter_access, ///< Instruction that requires access to the gas counter.
pc ///< The PC instruction.
};

struct op_table_entry
{
exec_fn fn;
int16_t gas_cost;
int8_t stack_req;
int8_t stack_change;
op_kind kind;
};
static_assert(sizeof(op_table_entry) <= 2 * sizeof(void*));
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if this is important, maybe op_kind's underlying type should be specified?


using op_table = std::array<op_table_entry, 256>;

Expand Down
232 changes: 116 additions & 116 deletions lib/evmone/instructions.cpp
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Expand Up @@ -1223,122 +1223,122 @@ constexpr op_table create_op_table_frontier() noexcept

// First, mark all opcodes as undefined.
for (auto& t : table)
t = {op_undefined, 0, 0, 0};

table[OP_STOP] = {op_stop, 0, 0, 0};
table[OP_ADD] = {op_add, 3, 2, -1};
table[OP_MUL] = {op_mul, 5, 2, -1};
table[OP_SUB] = {op_sub, 3, 2, -1};
table[OP_DIV] = {op_div, 5, 2, -1};
table[OP_SDIV] = {op_sdiv, 5, 2, -1};
table[OP_MOD] = {op_mod, 5, 2, -1};
table[OP_SMOD] = {op_smod, 5, 2, -1};
table[OP_ADDMOD] = {op_addmod, 8, 3, -2};
table[OP_MULMOD] = {op_mulmod, 8, 3, -2};
table[OP_EXP] = {op_exp, 10, 2, -1};
table[OP_SIGNEXTEND] = {op_signextend, 5, 2, -1};
table[OP_LT] = {op_lt, 3, 2, -1};
table[OP_GT] = {op_gt, 3, 2, -1};
table[OP_SLT] = {op_slt, 3, 2, -1};
table[OP_SGT] = {op_sgt, 3, 2, -1};
table[OP_EQ] = {op_eq, 3, 2, -1};
table[OP_ISZERO] = {op_iszero, 3, 1, 0};
table[OP_AND] = {op_and, 3, 2, -1};
table[OP_OR] = {op_or, 3, 2, -1};
table[OP_XOR] = {op_xor, 3, 2, -1};
table[OP_NOT] = {op_not, 3, 1, 0};
table[OP_BYTE] = {op_byte, 3, 2, -1};
table[OP_SHA3] = {op_sha3, 30, 2, -1};
table[OP_ADDRESS] = {op_address, 2, 0, 1};
table[OP_BALANCE] = {op_balance, 20, 1, 0};
table[OP_ORIGIN] = {op_origin, 2, 0, 1};
table[OP_CALLER] = {op_caller, 2, 0, 1};
table[OP_CALLVALUE] = {op_callvalue, 2, 0, 1};
table[OP_CALLDATALOAD] = {op_calldataload, 3, 1, 0};
table[OP_CALLDATASIZE] = {op_calldatasize, 2, 0, 1};
table[OP_CALLDATACOPY] = {op_calldatacopy, 3, 3, -3};
table[OP_CODESIZE] = {op_codesize, 2, 0, 1};
table[OP_CODECOPY] = {op_codecopy, 3, 3, -3};
table[OP_GASPRICE] = {op_gasprice, 2, 0, 1};
table[OP_EXTCODESIZE] = {op_extcodesize, 20, 1, 0};
table[OP_EXTCODECOPY] = {op_extcodecopy, 20, 4, -4};
table[OP_BLOCKHASH] = {op_blockhash, 20, 1, 0};
table[OP_COINBASE] = {op_coinbase, 2, 0, 1};
table[OP_TIMESTAMP] = {op_timestamp, 2, 0, 1};
table[OP_NUMBER] = {op_number, 2, 0, 1};
table[OP_DIFFICULTY] = {op_difficulty, 2, 0, 1};
table[OP_GASLIMIT] = {op_gaslimit, 2, 0, 1};
table[OP_POP] = {op_pop, 2, 1, -1};
table[OP_MLOAD] = {op_mload, 3, 1, 0};
table[OP_MSTORE] = {op_mstore, 3, 2, -2};
table[OP_MSTORE8] = {op_mstore8, 3, 2, -2};
table[OP_SLOAD] = {op_sload, 50, 1, 0};
table[OP_SSTORE] = {op_sstore, 0, 2, -2};
table[OP_JUMP] = {op_jump, 8, 1, -1};
table[OP_JUMPI] = {op_jumpi, 10, 2, -2};
table[OP_PC] = {op_pc, 2, 0, 1};
table[OP_MSIZE] = {op_msize, 2, 0, 1};
table[OP_GAS] = {op_gas, 2, 0, 1};
table[OPX_BEGINBLOCK] = {opx_beginblock, 1, 0, 0}; // Replaces JUMPDEST.
t = {op_undefined, 0, 0, 0, op_kind::regular};

table[OP_STOP] = {op_stop, 0, 0, 0, op_kind::terminator};
table[OP_ADD] = {op_add, 3, 2, -1, op_kind::regular};
table[OP_MUL] = {op_mul, 5, 2, -1, op_kind::regular};
table[OP_SUB] = {op_sub, 3, 2, -1, op_kind::regular};
table[OP_DIV] = {op_div, 5, 2, -1, op_kind::regular};
table[OP_SDIV] = {op_sdiv, 5, 2, -1, op_kind::regular};
table[OP_MOD] = {op_mod, 5, 2, -1, op_kind::regular};
table[OP_SMOD] = {op_smod, 5, 2, -1, op_kind::regular};
table[OP_ADDMOD] = {op_addmod, 8, 3, -2, op_kind::regular};
table[OP_MULMOD] = {op_mulmod, 8, 3, -2, op_kind::regular};
table[OP_EXP] = {op_exp, 10, 2, -1, op_kind::regular};
table[OP_SIGNEXTEND] = {op_signextend, 5, 2, -1, op_kind::regular};
table[OP_LT] = {op_lt, 3, 2, -1, op_kind::regular};
table[OP_GT] = {op_gt, 3, 2, -1, op_kind::regular};
table[OP_SLT] = {op_slt, 3, 2, -1, op_kind::regular};
table[OP_SGT] = {op_sgt, 3, 2, -1, op_kind::regular};
table[OP_EQ] = {op_eq, 3, 2, -1, op_kind::regular};
table[OP_ISZERO] = {op_iszero, 3, 1, 0, op_kind::regular};
table[OP_AND] = {op_and, 3, 2, -1, op_kind::regular};
table[OP_OR] = {op_or, 3, 2, -1, op_kind::regular};
table[OP_XOR] = {op_xor, 3, 2, -1, op_kind::regular};
table[OP_NOT] = {op_not, 3, 1, 0, op_kind::regular};
table[OP_BYTE] = {op_byte, 3, 2, -1, op_kind::regular};
table[OP_SHA3] = {op_sha3, 30, 2, -1, op_kind::regular};
table[OP_ADDRESS] = {op_address, 2, 0, 1, op_kind::regular};
table[OP_BALANCE] = {op_balance, 20, 1, 0, op_kind::regular};
table[OP_ORIGIN] = {op_origin, 2, 0, 1, op_kind::regular};
table[OP_CALLER] = {op_caller, 2, 0, 1, op_kind::regular};
table[OP_CALLVALUE] = {op_callvalue, 2, 0, 1, op_kind::regular};
table[OP_CALLDATALOAD] = {op_calldataload, 3, 1, 0, op_kind::regular};
table[OP_CALLDATASIZE] = {op_calldatasize, 2, 0, 1, op_kind::regular};
table[OP_CALLDATACOPY] = {op_calldatacopy, 3, 3, -3, op_kind::regular};
table[OP_CODESIZE] = {op_codesize, 2, 0, 1, op_kind::regular};
table[OP_CODECOPY] = {op_codecopy, 3, 3, -3, op_kind::regular};
table[OP_GASPRICE] = {op_gasprice, 2, 0, 1, op_kind::regular};
table[OP_EXTCODESIZE] = {op_extcodesize, 20, 1, 0, op_kind::regular};
table[OP_EXTCODECOPY] = {op_extcodecopy, 20, 4, -4, op_kind::regular};
table[OP_BLOCKHASH] = {op_blockhash, 20, 1, 0, op_kind::regular};
table[OP_COINBASE] = {op_coinbase, 2, 0, 1, op_kind::regular};
table[OP_TIMESTAMP] = {op_timestamp, 2, 0, 1, op_kind::regular};
table[OP_NUMBER] = {op_number, 2, 0, 1, op_kind::regular};
table[OP_DIFFICULTY] = {op_difficulty, 2, 0, 1, op_kind::regular};
table[OP_GASLIMIT] = {op_gaslimit, 2, 0, 1, op_kind::regular};
table[OP_POP] = {op_pop, 2, 1, -1, op_kind::regular};
table[OP_MLOAD] = {op_mload, 3, 1, 0, op_kind::regular};
table[OP_MSTORE] = {op_mstore, 3, 2, -2, op_kind::regular};
table[OP_MSTORE8] = {op_mstore8, 3, 2, -2, op_kind::regular};
table[OP_SLOAD] = {op_sload, 50, 1, 0, op_kind::regular};
table[OP_SSTORE] = {op_sstore, 0, 2, -2, op_kind::regular};
table[OP_JUMP] = {op_jump, 8, 1, -1, op_kind::terminator};
table[OP_JUMPI] = {op_jumpi, 10, 2, -2, op_kind::terminator};
table[OP_PC] = {op_pc, 2, 0, 1, op_kind::pc};
table[OP_MSIZE] = {op_msize, 2, 0, 1, op_kind::regular};
table[OP_GAS] = {op_gas, 2, 0, 1, op_kind::gas_counter_access};
table[OPX_BEGINBLOCK] = {opx_beginblock, 1, 0, 0, op_kind::regular}; // Replaces JUMPDEST.

for (auto op = size_t{OP_PUSH1}; op <= OP_PUSH8; ++op)
table[op] = {op_push_small, 3, 0, 1};
table[op] = {op_push_small, 3, 0, 1, op_kind::small_push};
for (auto op = size_t{OP_PUSH9}; op <= OP_PUSH32; ++op)
table[op] = {op_push_full, 3, 0, 1};

table[OP_DUP1] = {op_dup<OP_DUP1>, 3, 1, 1};
table[OP_DUP2] = {op_dup<OP_DUP2>, 3, 2, 1};
table[OP_DUP3] = {op_dup<OP_DUP3>, 3, 3, 1};
table[OP_DUP4] = {op_dup<OP_DUP4>, 3, 4, 1};
table[OP_DUP5] = {op_dup<OP_DUP5>, 3, 5, 1};
table[OP_DUP6] = {op_dup<OP_DUP6>, 3, 6, 1};
table[OP_DUP7] = {op_dup<OP_DUP7>, 3, 7, 1};
table[OP_DUP8] = {op_dup<OP_DUP8>, 3, 8, 1};
table[OP_DUP9] = {op_dup<OP_DUP9>, 3, 9, 1};
table[OP_DUP10] = {op_dup<OP_DUP10>, 3, 10, 1};
table[OP_DUP11] = {op_dup<OP_DUP11>, 3, 11, 1};
table[OP_DUP12] = {op_dup<OP_DUP12>, 3, 12, 1};
table[OP_DUP13] = {op_dup<OP_DUP13>, 3, 13, 1};
table[OP_DUP14] = {op_dup<OP_DUP14>, 3, 14, 1};
table[OP_DUP15] = {op_dup<OP_DUP15>, 3, 15, 1};
table[OP_DUP16] = {op_dup<OP_DUP16>, 3, 16, 1};

table[OP_SWAP1] = {op_swap<OP_SWAP1>, 3, 2, 0};
table[OP_SWAP2] = {op_swap<OP_SWAP2>, 3, 3, 0};
table[OP_SWAP3] = {op_swap<OP_SWAP3>, 3, 4, 0};
table[OP_SWAP4] = {op_swap<OP_SWAP4>, 3, 5, 0};
table[OP_SWAP5] = {op_swap<OP_SWAP5>, 3, 6, 0};
table[OP_SWAP6] = {op_swap<OP_SWAP6>, 3, 7, 0};
table[OP_SWAP7] = {op_swap<OP_SWAP7>, 3, 8, 0};
table[OP_SWAP8] = {op_swap<OP_SWAP8>, 3, 9, 0};
table[OP_SWAP9] = {op_swap<OP_SWAP9>, 3, 10, 0};
table[OP_SWAP10] = {op_swap<OP_SWAP10>, 3, 11, 0};
table[OP_SWAP11] = {op_swap<OP_SWAP11>, 3, 12, 0};
table[OP_SWAP12] = {op_swap<OP_SWAP12>, 3, 13, 0};
table[OP_SWAP13] = {op_swap<OP_SWAP13>, 3, 14, 0};
table[OP_SWAP14] = {op_swap<OP_SWAP14>, 3, 15, 0};
table[OP_SWAP15] = {op_swap<OP_SWAP15>, 3, 16, 0};
table[OP_SWAP16] = {op_swap<OP_SWAP16>, 3, 17, 0};

table[OP_LOG0] = {op_log<OP_LOG0>, 1 * 375, 2, -2};
table[OP_LOG1] = {op_log<OP_LOG1>, 2 * 375, 3, -3};
table[OP_LOG2] = {op_log<OP_LOG2>, 3 * 375, 4, -4};
table[OP_LOG3] = {op_log<OP_LOG3>, 4 * 375, 5, -5};
table[OP_LOG4] = {op_log<OP_LOG4>, 5 * 375, 6, -6};

table[OP_CREATE] = {op_create, 32000, 3, -2};
table[OP_CALL] = {op_call<EVMC_CALL>, 40, 7, -6};
table[OP_CALLCODE] = {op_call<EVMC_CALLCODE>, 40, 7, -6};
table[OP_RETURN] = {op_return, 0, 2, -2};
table[OP_INVALID] = {op_invalid, 0, 0, 0};
table[OP_SELFDESTRUCT] = {op_selfdestruct, 0, 1, -1};
table[op] = {op_push_full, 3, 0, 1, op_kind::large_push};

table[OP_DUP1] = {op_dup<OP_DUP1>, 3, 1, 1, op_kind::regular};
table[OP_DUP2] = {op_dup<OP_DUP2>, 3, 2, 1, op_kind::regular};
table[OP_DUP3] = {op_dup<OP_DUP3>, 3, 3, 1, op_kind::regular};
table[OP_DUP4] = {op_dup<OP_DUP4>, 3, 4, 1, op_kind::regular};
table[OP_DUP5] = {op_dup<OP_DUP5>, 3, 5, 1, op_kind::regular};
table[OP_DUP6] = {op_dup<OP_DUP6>, 3, 6, 1, op_kind::regular};
table[OP_DUP7] = {op_dup<OP_DUP7>, 3, 7, 1, op_kind::regular};
table[OP_DUP8] = {op_dup<OP_DUP8>, 3, 8, 1, op_kind::regular};
table[OP_DUP9] = {op_dup<OP_DUP9>, 3, 9, 1, op_kind::regular};
table[OP_DUP10] = {op_dup<OP_DUP10>, 3, 10, 1, op_kind::regular};
table[OP_DUP11] = {op_dup<OP_DUP11>, 3, 11, 1, op_kind::regular};
table[OP_DUP12] = {op_dup<OP_DUP12>, 3, 12, 1, op_kind::regular};
table[OP_DUP13] = {op_dup<OP_DUP13>, 3, 13, 1, op_kind::regular};
table[OP_DUP14] = {op_dup<OP_DUP14>, 3, 14, 1, op_kind::regular};
table[OP_DUP15] = {op_dup<OP_DUP15>, 3, 15, 1, op_kind::regular};
table[OP_DUP16] = {op_dup<OP_DUP16>, 3, 16, 1, op_kind::regular};

table[OP_SWAP1] = {op_swap<OP_SWAP1>, 3, 2, 0, op_kind::regular};
table[OP_SWAP2] = {op_swap<OP_SWAP2>, 3, 3, 0, op_kind::regular};
table[OP_SWAP3] = {op_swap<OP_SWAP3>, 3, 4, 0, op_kind::regular};
table[OP_SWAP4] = {op_swap<OP_SWAP4>, 3, 5, 0, op_kind::regular};
table[OP_SWAP5] = {op_swap<OP_SWAP5>, 3, 6, 0, op_kind::regular};
table[OP_SWAP6] = {op_swap<OP_SWAP6>, 3, 7, 0, op_kind::regular};
table[OP_SWAP7] = {op_swap<OP_SWAP7>, 3, 8, 0, op_kind::regular};
table[OP_SWAP8] = {op_swap<OP_SWAP8>, 3, 9, 0, op_kind::regular};
table[OP_SWAP9] = {op_swap<OP_SWAP9>, 3, 10, 0, op_kind::regular};
table[OP_SWAP10] = {op_swap<OP_SWAP10>, 3, 11, 0, op_kind::regular};
table[OP_SWAP11] = {op_swap<OP_SWAP11>, 3, 12, 0, op_kind::regular};
table[OP_SWAP12] = {op_swap<OP_SWAP12>, 3, 13, 0, op_kind::regular};
table[OP_SWAP13] = {op_swap<OP_SWAP13>, 3, 14, 0, op_kind::regular};
table[OP_SWAP14] = {op_swap<OP_SWAP14>, 3, 15, 0, op_kind::regular};
table[OP_SWAP15] = {op_swap<OP_SWAP15>, 3, 16, 0, op_kind::regular};
table[OP_SWAP16] = {op_swap<OP_SWAP16>, 3, 17, 0, op_kind::regular};

table[OP_LOG0] = {op_log<OP_LOG0>, 1 * 375, 2, -2, op_kind::regular};
table[OP_LOG1] = {op_log<OP_LOG1>, 2 * 375, 3, -3, op_kind::regular};
table[OP_LOG2] = {op_log<OP_LOG2>, 3 * 375, 4, -4, op_kind::regular};
table[OP_LOG3] = {op_log<OP_LOG3>, 4 * 375, 5, -5, op_kind::regular};
table[OP_LOG4] = {op_log<OP_LOG4>, 5 * 375, 6, -6, op_kind::regular};

table[OP_CREATE] = {op_create, 32000, 3, -2, op_kind::gas_counter_access};
table[OP_CALL] = {op_call<EVMC_CALL>, 40, 7, -6, op_kind::gas_counter_access};
table[OP_CALLCODE] = {op_call<EVMC_CALLCODE>, 40, 7, -6, op_kind::gas_counter_access};
table[OP_RETURN] = {op_return, 0, 2, -2, op_kind::terminator};
table[OP_INVALID] = {op_invalid, 0, 0, 0, op_kind::regular};
table[OP_SELFDESTRUCT] = {op_selfdestruct, 0, 1, -1, op_kind::terminator};
return table;
}

constexpr op_table create_op_table_homestead() noexcept
{
auto table = create_op_table_frontier();
table[OP_DELEGATECALL] = {op_delegatecall, 40, 6, -5};
table[OP_DELEGATECALL] = {op_delegatecall, 40, 6, -5, op_kind::gas_counter_access};
return table;
}

Expand All @@ -1359,21 +1359,21 @@ constexpr op_table create_op_table_tangerine_whistle() noexcept
constexpr op_table create_op_table_byzantium() noexcept
{
auto table = create_op_table_tangerine_whistle();
table[OP_RETURNDATASIZE] = {op_returndatasize, 2, 0, 1};
table[OP_RETURNDATACOPY] = {op_returndatacopy, 3, 3, -3};
table[OP_STATICCALL] = {op_staticcall, 700, 6, -5};
table[OP_REVERT] = {op_revert, 0, 2, -2};
table[OP_RETURNDATASIZE] = {op_returndatasize, 2, 0, 1, op_kind::regular};
table[OP_RETURNDATACOPY] = {op_returndatacopy, 3, 3, -3, op_kind::regular};
table[OP_STATICCALL] = {op_staticcall, 700, 6, -5, op_kind::gas_counter_access};
table[OP_REVERT] = {op_revert, 0, 2, -2, op_kind::terminator};
return table;
}

constexpr op_table create_op_table_constantinople() noexcept
{
auto table = create_op_table_byzantium();
table[OP_SHL] = {op_shl, 3, 2, -1};
table[OP_SHR] = {op_shr, 3, 2, -1};
table[OP_SAR] = {op_sar, 3, 2, -1};
table[OP_EXTCODEHASH] = {op_extcodehash, 400, 1, 0};
table[OP_CREATE2] = {op_create2, 32000, 4, -3};
table[OP_SHL] = {op_shl, 3, 2, -1, op_kind::regular};
table[OP_SHR] = {op_shr, 3, 2, -1, op_kind::regular};
table[OP_SAR] = {op_sar, 3, 2, -1, op_kind::regular};
table[OP_EXTCODEHASH] = {op_extcodehash, 400, 1, 0, op_kind::regular};
table[OP_CREATE2] = {op_create2, 32000, 4, -3, op_kind::gas_counter_access};
return table;
}

Expand Down