module.1.13.go

// +build go1.13
// +build !go1.14,!go1.15

package goloader

import (
	"cmd/objfile/goobj"
	"cmd/objfile/objabi"
	"strings"
)

// layout of Itab known to compilers
// allocated in non-garbage-collected memory
// Needs to be in sync with
// ../cmd/compile/internal/gc/reflect.go:/^func.dumptypestructs.
type itab struct {
	inter *interfacetype
	_type *_type
	hash  uint32 // copy of _type.hash. Used for type switches.
	_     [4]byte
	fun   [1]uintptr // variable sized. fun[0]==0 means _type does not implement inter.
}

// A stackObjectRecord is generated by the compiler for each stack object in a stack frame.
// This record must match the generator code in cmd/compile/internal/gc/ssa.go:emitStackObjects.
type stackObjectRecord struct {
	// offset in frame
	// if negative, offset from varp
	// if non-negative, offset from argp
	off int
	typ *_type
}

// PCDATA and FUNCDATA table indexes.
//
// See funcdata.h and ../cmd/internal/objabi/funcdata.go.
const (
	_PCDATA_RegMapIndex   = 0
	_PCDATA_StackMapIndex = 1
	_PCDATA_InlTreeIndex  = 2

	_FUNCDATA_ArgsPointerMaps   = 0
	_FUNCDATA_LocalsPointerMaps = 1
	_FUNCDATA_RegPointerMaps    = 2
	_FUNCDATA_StackObjects      = 3
	_FUNCDATA_InlTree           = 4
	_ArgsSizeUnknown            = -0x80000000
)

type moduledata struct {
	pclntable    []byte
	ftab         []functab
	filetab      []uint32
	findfunctab  uintptr
	minpc, maxpc uintptr

	text, etext           uintptr
	noptrdata, enoptrdata uintptr
	data, edata           uintptr
	bss, ebss             uintptr
	noptrbss, enoptrbss   uintptr
	end, gcdata, gcbss    uintptr
	types, etypes         uintptr

	textsectmap []textsect
	typelinks   []int32 // offsets from types
	itablinks   []*itab

	ptab []ptabEntry

	pluginpath string
	pkghashes  []modulehash

	modulename   string
	modulehashes []modulehash

	hasmain uint8 // 1 if module contains the main function, 0 otherwise

	gcdatamask, gcbssmask bitvector

	typemap map[typeOff]uintptr // offset to *_rtype in previous module

	bad bool // module failed to load and should be ignored

	next *moduledata
}

// A funcID identifies particular functions that need to be treated
// specially by the runtime.
// Note that in some situations involving plugins, there may be multiple
// copies of a particular special runtime function.
// Note: this list must match the list in cmd/internal/objabi/funcid.go.
type funcID uint8

type _func struct {
	entry   uintptr // start pc
	nameoff int32   // function name

	args int32 // in/out args size
	_    int32 // previously legacy frame size; kept for layout compatibility

	pcsp      int32
	pcfile    int32
	pcln      int32
	npcdata   int32
	funcID    funcID  // set for certain special runtime functions
	_         [2]int8 // unused
	nfuncdata uint8
}

func init_func(curSym *goobj.Sym, curSymOffset, nameOff, spOff, pcfileOff, pclnOff int) _func {
	var file string
	if curSym.Func != nil && len(curSym.Func.File) > 0 {
		file = strings.TrimLeft(curSym.Func.File[0], "gofile..")
	}
	fdata := _func{
		entry:     uintptr(curSymOffset),
		nameoff:   int32(nameOff),
		args:      int32(curSym.Func.Args),
		pcsp:      int32(spOff),
		pcfile:    int32(pcfileOff),
		pcln:      int32(pclnOff),
		npcdata:   int32(len(curSym.Func.PCData)),
		funcID:    funcID(objabi.GetFuncID(curSym.Name, file)),
		nfuncdata: uint8(len(curSym.Func.FuncData)),
	}
	return fdata
}