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module.go
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module.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
// Copyright 2017 The go-interpreter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wasm
import (
"errors"
"io"
"OntologyWithPOC/vm/wasmvm/wasm/internal/readpos"
)
var ErrInvalidMagic = errors.New("wasm: Invalid magic number")
const (
Magic uint32 = 0x6d736100
Version uint32 = 0x1
)
// Function represents an entry in the function index space of a module.
type Function struct {
IsEnvFunc bool //is the function is a env func
Name string //function name
Sig *FunctionSig
Body *FunctionBody
}
// Module represents a parsed WebAssembly module:
// http://webassembly.org/docs/modules/
type Module struct {
Version uint32
Types *SectionTypes
Import *SectionImports
Function *SectionFunctions
Table *SectionTables
Memory *SectionMemories
Global *SectionGlobals
Export *SectionExports
Start *SectionStartFunction
Elements *SectionElements
Code *SectionCode
Data *SectionData
// The function index space of the module
FunctionIndexSpace []Function
GlobalIndexSpace []GlobalEntry
// function indices into the global function space
// the limit of each table is its capacity (cap)
TableIndexSpace [][]uint32
LinearMemoryIndexSpace [][]byte
Other []Section // Other holds the custom sections if any
imports struct {
Funcs []uint32
Globals int
Tables int
Memories int
}
}
// ResolveFunc is a function that takes a module name and
// returns a valid resolved module.
type ResolveFunc func(name string) (*Module, error)
// ReadModule reads a module from the reader r. resolvePath must take a string
// and a return a reader to the module pointed to by the string.
func ReadModule(r io.Reader, resolvePath ResolveFunc) (*Module, error) {
reader := &readpos.ReadPos{
R: r,
CurPos: 0,
}
m := &Module{}
magic, err := readU32(reader)
if err != nil {
return nil, err
}
if magic != Magic {
return nil, ErrInvalidMagic
}
if m.Version, err = readU32(reader); err != nil {
return nil, err
}
for {
done, err := m.readSection(reader)
if err != nil {
return nil, err
} else if done {
break
}
}
m.LinearMemoryIndexSpace = make([][]byte, 1)
if m.Table != nil {
m.TableIndexSpace = make([][]uint32, int(len(m.Table.Entries)))
}
if m.Import != nil && resolvePath != nil {
err := m.resolveImports(resolvePath)
if err != nil {
return nil, err
}
}
for _, fn := range []func() error{
m.populateGlobals,
m.populateFunctions,
m.populateTables,
m.populateLinearMemory,
} {
if err := fn(); err != nil {
return nil, err
}
}
logger.Printf("There are %d entries in the function index space.", len(m.FunctionIndexSpace))
return m, nil
}