mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
131 lines
5.0 KiB
C++
131 lines
5.0 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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/**
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* @date 2017
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* Abstract assembly interface, subclasses of which are to be used with the generic
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* bytecode generator.
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*/
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#pragma once
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#include <libdevcore/Common.h>
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#include <libdevcore/CommonData.h>
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#include <functional>
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#include <memory>
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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 dev
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{
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namespace eth
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{
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enum class Instruction: uint8_t;
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}
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}
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namespace yul
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{
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struct Identifier;
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///
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/// Assembly class that abstracts both the libevmasm assembly and the new Yul assembly.
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///
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class AbstractAssembly
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{
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public:
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using LabelID = size_t;
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using SubID = size_t;
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virtual ~AbstractAssembly() = default;
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/// Set a new source location valid starting from the next instruction.
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virtual void setSourceLocation(langutil::SourceLocation const& _location) = 0;
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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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virtual int stackHeight() const = 0;
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virtual void setStackHeight(int height) = 0;
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/// Append an EVM instruction.
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virtual void appendInstruction(dev::eth::Instruction _instruction) = 0;
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/// Append a constant.
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virtual void appendConstant(dev::u256 const& _constant) = 0;
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/// Append a label.
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virtual void appendLabel(LabelID _labelId) = 0;
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/// Append a label reference.
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virtual void appendLabelReference(LabelID _labelId) = 0;
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/// Generate a new unique label.
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virtual LabelID newLabelId() = 0;
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/// Returns a label identified by the given name. Creates it if it does not yet exist.
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virtual LabelID namedLabel(std::string const& _name) = 0;
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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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virtual void appendLinkerSymbol(std::string const& _name) = 0;
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/// Append a jump instruction.
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/// @param _stackDiffAfter the stack adjustment after this instruction.
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/// This is helpful to stack height analysis if there is no continuing control flow.
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virtual void appendJump(int _stackDiffAfter) = 0;
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/// Append a jump-to-immediate operation.
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/// @param _stackDiffAfter the stack adjustment after this instruction.
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virtual void appendJumpTo(LabelID _labelId, int _stackDiffAfter = 0) = 0;
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/// Append a jump-to-if-immediate operation.
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virtual void appendJumpToIf(LabelID _labelId) = 0;
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/// Start a subroutine identified by @a _labelId that takes @a _arguments
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/// stack slots as arguments.
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virtual void appendBeginsub(LabelID _labelId, int _arguments) = 0;
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/// Call a subroutine identified by @a _labelId, taking @a _arguments from the
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/// stack upon call and putting @a _returns arguments onto the stack upon return.
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virtual void appendJumpsub(LabelID _labelId, int _arguments, int _returns) = 0;
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/// Return from a subroutine.
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/// @param _stackDiffAfter the stack adjustment after this instruction.
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virtual void appendReturnsub(int _returns, int _stackDiffAfter = 0) = 0;
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/// Append the assembled size as a constant.
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virtual void appendAssemblySize() = 0;
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/// Creates a new sub-assembly, which can be referenced using dataSize and dataOffset.
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virtual std::pair<std::shared_ptr<AbstractAssembly>, SubID> createSubAssembly() = 0;
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/// Appends the offset of the given sub-assembly or data.
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virtual void appendDataOffset(SubID _sub) = 0;
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/// Appends the size of the given sub-assembly or data.
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virtual void appendDataSize(SubID _sub) = 0;
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/// Appends the given data to the assembly and returns its ID.
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virtual SubID appendData(dev::bytes const& _data) = 0;
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};
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enum class IdentifierContext { LValue, RValue, VariableDeclaration };
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/// Object that is used to resolve references and generate code for access to identifiers external
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/// to inline assembly (not used in standalone assembly mode).
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struct ExternalIdentifierAccess
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{
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using Resolver = std::function<size_t(Identifier const&, IdentifierContext, bool /*_crossesFunctionBoundary*/)>;
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/// Resolve an external reference given by the identifier in the given context.
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/// @returns the size of the value (number of stack slots) or size_t(-1) if not found.
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Resolver resolve;
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using CodeGenerator = std::function<void(Identifier const&, IdentifierContext, yul::AbstractAssembly&)>;
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/// Generate code for retrieving the value (rvalue context) or storing the value (lvalue context)
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/// of an identifier. The code should be appended to the assembly. In rvalue context, the value is supposed
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/// to be put onto the stack, in lvalue context, the value is assumed to be at the top of the stack.
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CodeGenerator generateCode;
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};
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}
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