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// Copyright 2019 The Go 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 goobj2
import (
"bytes"
"encoding/binary"
)
// FuncInfo is serialized as a symbol (aux symbol). The symbol data is
// the binary encoding of the struct below.
//
// TODO: make each pcdata a separate symbol?
type FuncInfo struct {
Args uint32
Locals uint32
Pcsp uint32
Pcfile uint32
Pcline uint32
Pcinline uint32
Pcdata []uint32
PcdataEnd uint32
Funcdataoff []uint32
File []SymRef // TODO: just use string?
InlTree []InlTreeNode
}
func (a *FuncInfo) Write(w *bytes.Buffer) {
var b [4]byte
writeUint32 := func(x uint32) {
binary.LittleEndian.PutUint32(b[:], x)
w.Write(b[:])
}
writeUint32(a.Args)
writeUint32(a.Locals)
writeUint32(a.Pcsp)
writeUint32(a.Pcfile)
writeUint32(a.Pcline)
writeUint32(a.Pcinline)
writeUint32(uint32(len(a.Pcdata)))
for _, x := range a.Pcdata {
writeUint32(x)
}
writeUint32(a.PcdataEnd)
writeUint32(uint32(len(a.Funcdataoff)))
for _, x := range a.Funcdataoff {
writeUint32(x)
}
writeUint32(uint32(len(a.File)))
for _, f := range a.File {
writeUint32(f.PkgIdx)
writeUint32(f.SymIdx)
}
writeUint32(uint32(len(a.InlTree)))
for i := range a.InlTree {
a.InlTree[i].Write(w)
}
}
func (a *FuncInfo) Read(b []byte) {
readUint32 := func() uint32 {
x := binary.LittleEndian.Uint32(b)
b = b[4:]
return x
}
a.Args = readUint32()
a.Locals = readUint32()
a.Pcsp = readUint32()
a.Pcfile = readUint32()
a.Pcline = readUint32()
a.Pcinline = readUint32()
pcdatalen := readUint32()
a.Pcdata = make([]uint32, pcdatalen)
for i := range a.Pcdata {
a.Pcdata[i] = readUint32()
}
a.PcdataEnd = readUint32()
funcdataofflen := readUint32()
a.Funcdataoff = make([]uint32, funcdataofflen)
for i := range a.Funcdataoff {
a.Funcdataoff[i] = readUint32()
}
filelen := readUint32()
a.File = make([]SymRef, filelen)
for i := range a.File {
a.File[i] = SymRef{readUint32(), readUint32()}
}
inltreelen := readUint32()
a.InlTree = make([]InlTreeNode, inltreelen)
for i := range a.InlTree {
b = a.InlTree[i].Read(b)
}
}
// Accessors reading only some fields.
// TODO: more accessors.
func (*FuncInfo) ReadLocals(b []byte) uint32 { return binary.LittleEndian.Uint32(b[4:]) }
// return start and end offsets.
func (*FuncInfo) ReadPcsp(b []byte) (uint32, uint32) {
return binary.LittleEndian.Uint32(b[8:]), binary.LittleEndian.Uint32(b[12:])
}
// InlTreeNode is the serialized form of FileInfo.InlTree.
type InlTreeNode struct {
Parent int32
File SymRef
Line int32
Func SymRef
ParentPC int32
}
func (inl *InlTreeNode) Write(w *bytes.Buffer) {
var b [4]byte
writeUint32 := func(x uint32) {
binary.LittleEndian.PutUint32(b[:], x)
w.Write(b[:])
}
writeUint32(uint32(inl.Parent))
writeUint32(inl.File.PkgIdx)
writeUint32(inl.File.SymIdx)
writeUint32(uint32(inl.Line))
writeUint32(inl.Func.PkgIdx)
writeUint32(inl.Func.SymIdx)
writeUint32(uint32(inl.ParentPC))
}
// Read an InlTreeNode from b, return the remaining bytes.
func (inl *InlTreeNode) Read(b []byte) []byte {
readUint32 := func() uint32 {
x := binary.LittleEndian.Uint32(b)
b = b[4:]
return x
}
inl.Parent = int32(readUint32())
inl.File = SymRef{readUint32(), readUint32()}
inl.Line = int32(readUint32())
inl.Func = SymRef{readUint32(), readUint32()}
inl.ParentPC = int32(readUint32())
return b
}
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