github.com/phuslu/log@v1.0.100/runtime_go1.23.go (about)

     1  //go:build go1.23
     2  // +build 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  func pcFileLineName(pc uintptr) (file string, line int32, name string) {
    40  	funcInfo := findfunc(pc)
    41  	if funcInfo._func == nil {
    42  		return
    43  	}
    44  
    45  	entry := funcInfoEntry(funcInfo)
    46  
    47  	if pc > entry {
    48  		// We store the pc of the start of the instruction following
    49  		// the instruction in question (the call or the inline mark).
    50  		// This is done for historical reasons, and to make FuncForPC
    51  		// work correctly for entries in the result of runtime.Callers.
    52  		pc--
    53  	}
    54  
    55  	file, line = funcline1(funcInfo, pc, false)
    56  
    57  	// It's important that interpret pc non-strictly as cgoTraceback may
    58  	// have added bogus PCs with a valid funcInfo but invalid PCDATA.
    59  	u, uf := newInlineUnwinder(funcInfo, pc)
    60  	sf := inlineUnwinder_srcFunc(&u, uf)
    61  	name = srcFunc_name(sf)
    62  
    63  	return
    64  }
    65  
    66  //go:linkname newInlineUnwinder runtime.newInlineUnwinder
    67  func newInlineUnwinder(f funcInfo, pc uintptr) (inlineUnwinder, inlineFrame)
    68  
    69  //go:linkname inlineUnwinder_srcFunc runtime.(*inlineUnwinder).srcFunc
    70  func inlineUnwinder_srcFunc(*inlineUnwinder, inlineFrame) srcFunc
    71  
    72  //go:linkname srcFunc_name runtime.srcFunc.name
    73  func srcFunc_name(srcFunc) string
    74  
    75  // Fastrandn returns a pseudorandom uint32 in [0,n).
    76  //
    77  //go:noescape
    78  //go:linkname Fastrandn runtime.cheaprandn
    79  func Fastrandn(x uint32) uint32