libgo: Update to weekly.2012-01-15.

From-SVN: r183539

2 files changed, 10 insertions, 45 deletions

diff --git a/libgo/go/runtime/debug.go b/libgo/go/runtime/debug.go
index 1243703..c2b9056 100644
--- a/libgo/go/runtime/debug.go
+++ b/libgo/go/runtime/debug.go
@@ -19,6 +19,7 @@ func UnlockOSThread()
 // GOMAXPROCS sets the maximum number of CPUs that can be executing
 // simultaneously and returns the previous setting.  If n < 1, it does not
 // change the current setting.
+// The number of logical CPUs on the local machine can be queried with NumCPU.
 // This call will go away when the scheduler improves.
 func GOMAXPROCS(n int) int
 
diff --git a/libgo/go/runtime/extern.go b/libgo/go/runtime/extern.go
index 7c986da..25c7470 100644
--- a/libgo/go/runtime/extern.go
+++ b/libgo/go/runtime/extern.go
@@ -19,8 +19,8 @@ func Gosched()
 func Goexit()
 
 // Caller reports file and line number information about function invocations on
-// the calling goroutine's stack.  The argument skip is the number of stack frames to
-// ascend, with 0 identifying the the caller of Caller.  The return values report the
+// the calling goroutine's stack.  The argument skip is the number of stack frames
+// to ascend, with 0 identifying the caller of Caller.  The return values report the
 // program counter, file name, and line number within the file of the corresponding
 // call.  The boolean ok is false if it was not possible to recover the information.
 func Caller(skip int) (pc uintptr, file string, line int, ok bool)
@@ -59,54 +59,18 @@ func (f *Func) Entry() uintptr { return f.entry }
 // The result will not be accurate if pc is not a program
 // counter within f.
 func (f *Func) FileLine(pc uintptr) (file string, line int) {
-	// NOTE(rsc): If you edit this function, also edit
-	// symtab.c:/^funcline.  That function also has the
-	// comments explaining the logic.
-	targetpc := pc
-
-	var pcQuant uintptr = 1
-	if GOARCH == "arm" {
-		pcQuant = 4
-	}
-
-	p := f.pcln
-	pc = f.pc0
-	line = int(f.ln0)
-	i := 0
-	//print("FileLine start pc=", pc, " targetpc=", targetpc, " line=", line,
-	//	" tab=", p, " ", p[0], " quant=", pcQuant, " GOARCH=", GOARCH, "\n")
-	for {
-		for i < len(p) && p[i] > 128 {
-			pc += pcQuant * uintptr(p[i]-128)
-			i++
-		}
-		//print("pc<", pc, " targetpc=", targetpc, " line=", line, "\n")
-		if pc > targetpc || i >= len(p) {
-			break
-		}
-		if p[i] == 0 {
-			if i+5 > len(p) {
-				break
-			}
-			line += int(p[i+1]<<24) | int(p[i+2]<<16) | int(p[i+3]<<8) | int(p[i+4])
-			i += 5
-		} else if p[i] <= 64 {
-			line += int(p[i])
-			i++
-		} else {
-			line -= int(p[i] - 64)
-			i++
-		}
-		//print("pc=", pc, " targetpc=", targetpc, " line=", line, "\n")
-		pc += pcQuant
-	}
-	file = f.src
-	return
+	return funcline_go(f, pc)
 }
 
+// implemented in symtab.c
+func funcline_go(*Func, uintptr) (string, int)
+
 // mid returns the current os thread (m) id.
 func mid() uint32
 
+// NumCPU returns the number of logical CPUs on the local machine.
+func NumCPU() int
+
 // Semacquire waits until *s > 0 and then atomically decrements it.
 // It is intended as a simple sleep primitive for use by the synchronization
 // library and should not be used directly.