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36 lines
1.6 KiB
Go
36 lines
1.6 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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//
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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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/*
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Package vm implements the Ethereum Virtual Machine.
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The vm package implements two EVMs, a byte code VM and a JIT VM. The BC
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(Byte Code) VM loops over a set of bytes and executes them according to the set
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of rules defined in the Ethereum yellow paper. When the BC VM is invoked it
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invokes the JIT VM in a separate goroutine and compiles the byte code in JIT
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instructions.
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The JIT VM, when invoked, loops around a set of pre-defined instructions until
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it either runs of gas, causes an internal error, returns or stops.
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The JIT optimiser attempts to pre-compile instructions in to chunks or segments
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such as multiple PUSH operations and static JUMPs. It does this by analysing the
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opcodes and attempts to match certain regions to known sets. Whenever the
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optimiser finds said segments it creates a new instruction and replaces the
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first occurrence in the sequence.
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*/
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package vm
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