github.com/phuslu/log@v1.0.100/runtime_go1.22.go (about)

     1  //go:build go1.22 && !go1.23
     2  // +build go1.22,!go1.23
     3  
     4  // MIT license, copy and modify from https://github.com/tlog-dev/loc
     5  
     6  //nolint:unused
     7  package log
     8  
     9  import (
    10  	"unsafe"
    11  )
    12  
    13  // inlinedCall is the encoding of entries in the FUNCDATA_InlTree table.
    14  type inlinedCall struct {
    15  	funcID    uint8 // type of the called function
    16  	_         [3]byte
    17  	nameOff   int32 // offset into pclntab for name of called function
    18  	parentPc  int32 // position of an instruction whose source position is the call site (offset from entry)
    19  	startLine int32 // line number of start of function (func keyword/TEXT directive)
    20  }
    21  
    22  type inlineUnwinder struct {
    23  	f       funcInfo
    24  	inlTree *[1 << 20]inlinedCall
    25  }
    26  
    27  type inlineFrame struct {
    28  	pc    uintptr
    29  	index int32
    30  }
    31  
    32  type srcFunc struct {
    33  	datap     unsafe.Pointer
    34  	nameOff   int32
    35  	startLine int32
    36  	funcID    uint8
    37  }
    38  
    39  type _func struct {
    40  	entryOff uint32 // start pc, as offset from moduledata.text/pcHeader.textStart
    41  	nameOff  int32  // function name, as index into moduledata.funcnametab.
    42  
    43  	args        int32  // in/out args size
    44  	deferreturn uint32 // offset of start of a deferreturn call instruction from entry, if any.
    45  
    46  	pcsp      uint32
    47  	pcfile    uint32
    48  	pcln      uint32
    49  	npcdata   uint32
    50  	cuOffset  uint32 // runtime.cutab offset of this function's CU
    51  	startLine int32  // line number of start of function (func keyword/TEXT directive)
    52  	funcID    uint8  // set for certain special runtime functions
    53  	flag      uint8
    54  	_         [1]byte // pad
    55  	nfuncdata uint8   // must be last, must end on a uint32-aligned boundary
    56  }
    57  
    58  func pcFileLineName(pc uintptr) (file string, line int32, name string) {
    59  	funcInfo := findfunc(pc)
    60  	if funcInfo._func == nil {
    61  		return
    62  	}
    63  
    64  	entry := funcInfoEntry(funcInfo)
    65  
    66  	if pc > entry {
    67  		// We store the pc of the start of the instruction following
    68  		// the instruction in question (the call or the inline mark).
    69  		// This is done for historical reasons, and to make FuncForPC
    70  		// work correctly for entries in the result of runtime.Callers.
    71  		pc--
    72  	}
    73  
    74  	file, line = funcline1(funcInfo, pc, false)
    75  
    76  	// It's important that interpret pc non-strictly as cgoTraceback may
    77  	// have added bogus PCs with a valid funcInfo but invalid PCDATA.
    78  	u, uf := newInlineUnwinder(funcInfo, pc)
    79  	var sf srcFunc
    80  	if uf.index < 0 {
    81  		f := (*_func)(funcInfo._func)
    82  		sf = srcFunc{funcInfo.datap, f.nameOff, f.startLine, f.funcID}
    83  	} else {
    84  		t := &u.inlTree[uf.index]
    85  		sf = srcFunc{u.f.datap, t.nameOff, t.startLine, t.funcID}
    86  	}
    87  	name = srcFunc_name(sf)
    88  
    89  	return
    90  }
    91  
    92  //go:linkname newInlineUnwinder runtime.newInlineUnwinder
    93  func newInlineUnwinder(f funcInfo, pc uintptr) (inlineUnwinder, inlineFrame)
    94  
    95  //go:linkname srcFunc_name runtime.srcFunc.name
    96  func srcFunc_name(srcFunc) string
    97  
    98  // Fastrandn returns a pseudorandom uint32 in [0,n).
    99  //
   100  //go:noescape
   101  //go:linkname Fastrandn runtime.cheaprandn
   102  func Fastrandn(x uint32) uint32