runtime: copy mprof code from Go 1.7 runtime

    
    Also create a gccgo version of some of the traceback code in
    traceback_gccgo.go, replacing some code currently in C.
    
    This required modifying the compiler so that when compiling the runtime
    package a slice expression does not cause a local array variable to
    escape to the heap.
    
    Reviewed-on: https://go-review.googlesource.com/31230

From-SVN: r241189

1 files changed, 1 insertions, 16 deletions

diff --git a/libgo/go/runtime/runtime2.go b/libgo/go/runtime/runtime2.go
index 25b5b79..660d81e 100644
--- a/libgo/go/runtime/runtime2.go
+++ b/libgo/go/runtime/runtime2.go
@@ -394,7 +394,7 @@ type g struct {
 	issystem     bool // do not output in stack dump
 	isbackground bool // ignore in deadlock detector
 
-	traceback *traceback // stack traceback buffer
+	traceback *tracebackg // stack traceback buffer
 
 	context      g_ucontext_t       // saved context for setcontext
 	stackcontext [10]unsafe.Pointer // split-stack context
@@ -801,21 +801,6 @@ var (
 // array.
 type g_ucontext_t [(_sizeof_ucontext_t + 15) / unsafe.Sizeof(unsafe.Pointer(nil))]unsafe.Pointer
 
-// traceback is used to collect stack traces from other goroutines.
-type traceback struct {
-	gp     *g
-	locbuf [_TracebackMaxFrames]location
-	c      int
-}
-
-// location is a location in the program, used for backtraces.
-type location struct {
-	pc       uintptr
-	filename string
-	function string
-	lineno   int
-}
-
 // cgoMal tracks allocations made by _cgo_allocate
 // FIXME: _cgo_allocate has been removed from gc and can probably be
 // removed from gccgo too.