mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
105 lines
3.7 KiB
C++
105 lines
3.7 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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/**
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* Assembly interface for EVM and EVM1.5.
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*/
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#pragma once
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#include <libyul/backends/evm/AbstractAssembly.h>
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#include <libevmasm/LinkerObject.h>
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#include <map>
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namespace langutil
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{
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struct SourceLocation;
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}
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namespace yul
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{
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class EVMAssembly: public AbstractAssembly
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{
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public:
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explicit EVMAssembly(bool _evm15 = false): m_evm15(_evm15) { }
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virtual ~EVMAssembly() = default;
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/// Set a new source location valid starting from the next instruction.
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void setSourceLocation(langutil::SourceLocation const& _location) override;
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/// Retrieve the current height of the stack. This does not have to be zero
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/// at the beginning.
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int stackHeight() const override { return m_stackHeight; }
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void setStackHeight(int height) override { m_stackHeight = height; }
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/// Append an EVM instruction.
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void appendInstruction(dev::eth::Instruction _instruction) override;
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/// Append a constant.
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void appendConstant(dev::u256 const& _constant) override;
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/// Append a label.
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void appendLabel(LabelID _labelId) override;
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/// Append a label reference.
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void appendLabelReference(LabelID _labelId) override;
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/// Generate a new unique label.
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LabelID newLabelId() override;
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/// Returns a label identified by the given name. Creates it if it does not yet exist.
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LabelID namedLabel(std::string const& _name) override;
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/// Append a reference to a to-be-linked symbol.
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/// Currently, we assume that the value is always a 20 byte number.
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void appendLinkerSymbol(std::string const& _name) override;
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/// Append a jump instruction.
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/// @param _stackDiffAfter the stack adjustment after this instruction.
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void appendJump(int _stackDiffAfter) override;
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/// Append a jump-to-immediate operation.
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void appendJumpTo(LabelID _labelId, int _stackDiffAfter) override;
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/// Append a jump-to-if-immediate operation.
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void appendJumpToIf(LabelID _labelId) override;
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/// Start a subroutine.
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void appendBeginsub(LabelID _labelId, int _arguments) override;
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/// Call a subroutine.
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void appendJumpsub(LabelID _labelId, int _arguments, int _returns) override;
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/// Return from a subroutine.
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void appendReturnsub(int _returns, int _stackDiffAfter) override;
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/// Append the assembled size as a constant.
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void appendAssemblySize() override;
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std::pair<std::shared_ptr<AbstractAssembly>, SubID> createSubAssembly() override;
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void appendDataOffset(SubID _sub) override;
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void appendDataSize(SubID _sub) override;
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SubID appendData(dev::bytes const& _data) override;
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/// Resolves references inside the bytecode and returns the linker object.
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dev::eth::LinkerObject finalize();
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private:
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void setLabelToCurrentPosition(AbstractAssembly::LabelID _labelId);
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void appendLabelReferenceInternal(AbstractAssembly::LabelID _labelId);
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void updateReference(size_t pos, size_t size, dev::u256 value);
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bool m_evm15 = false; ///< if true, switch to evm1.5 mode
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LabelID m_nextLabelId = 0;
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int m_stackHeight = 0;
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dev::bytes m_bytecode;
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std::map<std::string, LabelID> m_namedLabels;
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std::map<LabelID, size_t> m_labelPositions;
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std::map<size_t, LabelID> m_labelReferences;
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std::vector<size_t> m_assemblySizePositions;
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};
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}
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