code review 134200044: runtime: convert traceback*.c to Go

src/pkg/runtime/stubs.go

 // Copyright 2014 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 runtime
 
 import "unsafe"
 
 // Declarations for runtime services implemented in C or assembly.
 // C implementations of these functions are in stubs.goc.
 // Assembly implementations are in various files, see comments with
 // each function.
 
 const ptrSize = 4 << (^uintptr(0) >> 63) // unsafe.Sizeof(uintptr(0)) but an ideal const
+const regSize = 4 << (^uintreg(0) >> 63) // unsafe.Sizeof(uintreg(0)) but an ideal const
 
 //go:noescape
 func racereadpc(addr unsafe.Pointer, callpc, pc uintptr)
 
 //go:noescape
 func racewritepc(addr unsafe.Pointer, callpc, pc uintptr)
 
 //go:noescape
 func racereadrangepc(addr unsafe.Pointer, len int, callpc, pc uintptr)
 
@@ skipping 109 matching lines @@
 func noescape(p unsafe.Pointer) unsafe.Pointer {
         x := uintptr(p)
         return unsafe.Pointer(x ^ 0)
 }
 
 func entersyscall()
 func entersyscallblock()
 func exitsyscall()
 
 func goroutineheader(gp *g)
-func traceback(pc, sp, lr uintptr, gp *g)
 func tracebackothers(gp *g)
 
 func cgocallback(fn, frame unsafe.Pointer, framesize uintptr)
 func gogo(buf *gobuf)
 func gosave(buf *gobuf)
 func read(fd int32, p unsafe.Pointer, n int32) int32
 func close(fd int32) int32
 func mincore(addr unsafe.Pointer, n uintptr, dst *byte) int32
 func jmpdefer(fv *funcval, argp unsafe.Pointer)
 func exit1(code int32)
@@ skipping 84 matching lines @@
 func getcallerpc(argp unsafe.Pointer) uintptr
 
 //go:noescape
 func getcallersp(argp unsafe.Pointer) uintptr
 
 //go:noescape
 func asmcgocall(fn, arg unsafe.Pointer)
 
 //go:noescape
 func open(name *byte, mode, perm int32) int32
+
+//go:noescape
+func gotraceback(*bool) int32
+
+func funcname(*_func) *byte
+
+func gofuncname(f *_func) string {
+        return gostringnocopy(funcname(f))
+}
+
+const _NoArgs = ^uintptr(0)
+
+var newproc, deferproc, lessstack struct{} // C/assembly functions
+
+func funcspdelta(*_func, uintptr) int32 // symtab.c
+func funcarglen(*_func, uintptr) int32  // symtab.c
+const _ArgsSizeUnknown = -0x80000000    // funcdata.h
+func topofstack(*_func) bool            // proc.c