mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
276 lines
9.0 KiB
C++
276 lines
9.0 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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/**
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* Dialects for Wasm.
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*/
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#include <libyul/backends/wasm/WasmDialect.h>
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#include <libyul/AST.h>
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#include <libyul/Exceptions.h>
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using namespace std;
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using namespace solidity::yul;
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WasmDialect::WasmDialect()
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{
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YulString i64 = "i64"_yulstring;
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YulString i32 = "i32"_yulstring;
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defaultType = i64;
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boolType = i32;
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types = {i64, i32};
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for (auto t: types)
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for (auto const& name: {
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"add",
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"sub",
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"mul",
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// TODO: div_s
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"div_u",
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// TODO: rem_s
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"rem_u",
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"and",
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"or",
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"xor",
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"shl",
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// TODO: shr_s
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"shr_u",
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// TODO: rotl
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// TODO: rotr
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})
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addFunction(t.str() + "." + name, {t, t}, {t});
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for (auto t: types)
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for (auto const& name: {
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"eq",
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"ne",
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// TODO: lt_s
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"lt_u",
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// TODO: gt_s
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"gt_u",
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// TODO: le_s
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"le_u",
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// TODO: ge_s
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"ge_u"
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})
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addFunction(t.str() + "." + name, {t, t}, {i32});
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addFunction("i32.eqz", {i32}, {i32});
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addFunction("i64.eqz", {i64}, {i32});
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for (auto t: types)
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for (auto const& name: {
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"clz",
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"ctz",
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"popcnt",
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})
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addFunction(t.str() + "." + name, {t}, {t});
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addFunction("i32.wrap_i64", {i64}, {i32});
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addFunction("i64.extend_i32_u", {i32}, {i64});
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addFunction("i32.store", {i32, i32}, {}, false);
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m_functions["i32.store"_yulstring].sideEffects.storage = SideEffects::None;
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m_functions["i32.store"_yulstring].sideEffects.otherState = SideEffects::None;
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addFunction("i64.store", {i32, i64}, {}, false);
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// TODO: add i32.store16, i64.store8, i64.store16, i64.store32
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m_functions["i64.store"_yulstring].sideEffects.storage = SideEffects::None;
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m_functions["i64.store"_yulstring].sideEffects.otherState = SideEffects::None;
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addFunction("i32.store8", {i32, i32}, {}, false);
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m_functions["i32.store8"_yulstring].sideEffects.storage = SideEffects::None;
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m_functions["i32.store8"_yulstring].sideEffects.otherState = SideEffects::None;
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addFunction("i64.store8", {i32, i64}, {}, false);
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m_functions["i64.store8"_yulstring].sideEffects.storage = SideEffects::None;
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m_functions["i64.store8"_yulstring].sideEffects.otherState = SideEffects::None;
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addFunction("i32.load", {i32}, {i32}, false);
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m_functions["i32.load"_yulstring].sideEffects.canBeRemoved = true;
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m_functions["i32.load"_yulstring].sideEffects.canBeRemovedIfNoMSize = true;
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m_functions["i32.load"_yulstring].sideEffects.storage = SideEffects::None;
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m_functions["i32.load"_yulstring].sideEffects.memory = SideEffects::Read;
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m_functions["i32.load"_yulstring].sideEffects.otherState = SideEffects::None;
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addFunction("i64.load", {i32}, {i64}, false);
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// TODO: add i32.load8, i32.load16, i64.load8, i64.load16, i64.load32
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m_functions["i64.load"_yulstring].sideEffects.canBeRemoved = true;
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m_functions["i64.load"_yulstring].sideEffects.canBeRemovedIfNoMSize = true;
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m_functions["i64.load"_yulstring].sideEffects.storage = SideEffects::None;
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m_functions["i64.load"_yulstring].sideEffects.memory = SideEffects::Read;
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m_functions["i64.load"_yulstring].sideEffects.otherState = SideEffects::None;
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// Drop is actually overloaded for all types, but Yul does not support that.
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// Because of that, we introduce "i32.drop" and "i64.drop".
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addFunction("i32.drop", {i32}, {});
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addFunction("i64.drop", {i64}, {});
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// Select is also overloaded.
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addFunction("i32.select", {i32, i32, i32}, {i32});
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addFunction("i64.select", {i64, i64, i32}, {i64});
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addFunction("nop", {}, {});
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addFunction("unreachable", {}, {}, false);
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m_functions["unreachable"_yulstring].sideEffects.storage = SideEffects::None;
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m_functions["unreachable"_yulstring].sideEffects.memory = SideEffects::None;
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m_functions["unreachable"_yulstring].sideEffects.otherState = SideEffects::None;
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m_functions["unreachable"_yulstring].controlFlowSideEffects.terminates = true;
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m_functions["unreachable"_yulstring].controlFlowSideEffects.reverts = true;
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addFunction("datasize", {i64}, {i64}, true, {LiteralKind::String});
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addFunction("dataoffset", {i64}, {i64}, true, {LiteralKind::String});
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addEthereumExternals();
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}
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BuiltinFunction const* WasmDialect::builtin(YulString _name) const
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{
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auto it = m_functions.find(_name);
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if (it != m_functions.end())
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return &it->second;
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else
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return nullptr;
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}
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BuiltinFunction const* WasmDialect::discardFunction(YulString _type) const
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{
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if (_type == "i32"_yulstring)
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return builtin("i32.drop"_yulstring);
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yulAssert(_type == "i64"_yulstring, "");
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return builtin("i64.drop"_yulstring);
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}
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BuiltinFunction const* WasmDialect::equalityFunction(YulString _type) const
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{
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if (_type == "i32"_yulstring)
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return builtin("i32.eq"_yulstring);
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yulAssert(_type == "i64"_yulstring, "");
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return builtin("i64.eq"_yulstring);
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}
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WasmDialect const& WasmDialect::instance()
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{
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static std::unique_ptr<WasmDialect> dialect;
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static YulStringRepository::ResetCallback callback{[&] { dialect.reset(); }};
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if (!dialect)
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dialect = make_unique<WasmDialect>();
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return *dialect;
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}
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void WasmDialect::addEthereumExternals()
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{
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// These are not YulStrings because that would be too complicated with regards
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// to the YulStringRepository reset.
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static string const i64{"i64"};
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static string const i32{"i32"};
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static string const i32ptr{"i32"}; // Uses "i32" on purpose.
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struct External
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{
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string name;
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vector<string> parameters;
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vector<string> returns;
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ControlFlowSideEffects controlFlowSideEffects = ControlFlowSideEffects{};
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};
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static vector<External> externals{
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{"getAddress", {i32ptr}, {}},
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{"getExternalBalance", {i32ptr, i32ptr}, {}},
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{"getBlockHash", {i64, i32ptr}, {i32}},
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{"call", {i64, i32ptr, i32ptr, i32ptr, i32}, {i32}},
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{"callDataCopy", {i32ptr, i32, i32}, {}},
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{"getCallDataSize", {}, {i32}},
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{"callCode", {i64, i32ptr, i32ptr, i32ptr, i32}, {i32}},
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{"callDelegate", {i64, i32ptr, i32ptr, i32}, {i32}},
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{"callStatic", {i64, i32ptr, i32ptr, i32}, {i32}},
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{"storageStore", {i32ptr, i32ptr}, {}},
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{"storageLoad", {i32ptr, i32ptr}, {}},
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{"getCaller", {i32ptr}, {}},
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{"getCallValue", {i32ptr}, {}},
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{"codeCopy", {i32ptr, i32, i32}, {}},
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{"getCodeSize", {}, {i32}},
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{"getBlockCoinbase", {i32ptr}, {}},
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{"create", {i32ptr, i32ptr, i32, i32ptr}, {i32}},
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{"getBlockDifficulty", {i32ptr}, {}},
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{"externalCodeCopy", {i32ptr, i32ptr, i32, i32}, {}},
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{"getExternalCodeSize", {i32ptr}, {i32}},
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{"getGasLeft", {}, {i64}},
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{"getBlockGasLimit", {}, {i64}},
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{"getTxGasPrice", {i32ptr}, {}},
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{"log", {i32ptr, i32, i32, i32ptr, i32ptr, i32ptr, i32ptr}, {}},
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{"getBlockNumber", {}, {i64}},
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{"getTxOrigin", {i32ptr}, {}},
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{"finish", {i32ptr, i32}, {}, ControlFlowSideEffects{true, false}},
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{"revert", {i32ptr, i32}, {}, ControlFlowSideEffects{true, true}},
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{"getReturnDataSize", {}, {i32}},
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{"returnDataCopy", {i32ptr, i32, i32}, {}},
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{"selfDestruct", {i32ptr}, {}, ControlFlowSideEffects{true, false}},
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{"getBlockTimestamp", {}, {i64}}
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};
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for (External const& ext: externals)
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{
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YulString name{"eth." + ext.name};
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BuiltinFunction& f = m_functions[name];
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f.name = name;
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for (string const& p: ext.parameters)
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f.parameters.emplace_back(YulString(p));
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for (string const& p: ext.returns)
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f.returns.emplace_back(YulString(p));
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// TODO some of them are side effect free.
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f.sideEffects = SideEffects::worst();
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f.sideEffects.cannotLoop = true;
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f.sideEffects.movableApartFromEffects = !ext.controlFlowSideEffects.terminates;
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f.controlFlowSideEffects = ext.controlFlowSideEffects;
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f.isMSize = false;
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f.literalArguments.clear();
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static set<string> const writesToStorage{
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"storageStore",
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"call",
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"callcode",
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"callDelegate",
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"create"
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};
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static set<string> const readsStorage{"storageLoad", "callStatic"};
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if (readsStorage.count(ext.name))
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f.sideEffects.storage = SideEffects::Read;
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else if (!writesToStorage.count(ext.name))
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f.sideEffects.storage = SideEffects::None;
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}
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}
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void WasmDialect::addFunction(
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string _name,
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vector<YulString> _params,
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vector<YulString> _returns,
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bool _movable,
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vector<optional<LiteralKind>> _literalArguments
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)
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{
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YulString name{move(_name)};
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BuiltinFunction& f = m_functions[name];
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f.name = name;
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f.parameters = std::move(_params);
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yulAssert(_returns.size() <= 1, "The Wasm 1.0 specification only allows up to 1 return value.");
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f.returns = std::move(_returns);
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f.sideEffects = _movable ? SideEffects{} : SideEffects::worst();
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f.sideEffects.cannotLoop = true;
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// TODO This should be improved when LoopInvariantCodeMotion gets specialized for WASM
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f.sideEffects.movableApartFromEffects = _movable;
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f.isMSize = false;
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f.literalArguments = std::move(_literalArguments);
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}
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