Basic support for slices

src/examples/hello/hello.go

@@ -23,6 +23,11 @@ func main() {
 	println("sumrange(100) =", sumrange(100))
 	println("strlen foo:", strlen("foo"))
 
+	foo := []int{1, 2, 4, 5}
+	println("len/cap foo:", len(foo), cap(foo))
+	println("foo[3]:", foo[3])
+	println("sum foo:", sum(foo))
+
 	thing := &Thing{"foo"}
 	println("thing:", thing.String())
 	printItf(5)
@@ -93,3 +98,11 @@ func sumrange(n int) int {
 	}
 	return sum
 }
+
+func sum(l []int) int {
+	sum := 0
+	for _, n := range l {
+		sum += n
+	}
+	return sum
+}

src/runtime/runtime.go

@@ -19,11 +19,20 @@ func _panic(message interface{}) {
 	abort()
 }
 
-func boundsCheck(outOfRange bool) {
-	if outOfRange {
+// Check for bounds in *ssa.IndexAddr and *ssa.Lookup.
+func lookupBoundsCheck(length, index int) {
+	if index < 0 || index >= length {
 		// printstring() here is safe as this function is excluded from bounds
 		// checking.
 		printstring("panic: runtime error: index out of range\n")
 		abort()
 	}
 }
+
+// Check for bounds in *ssa.Slice
+func sliceBoundsCheck(length, low, high uint) {
+	if !(0 <= low && low <= high && high <= length) {
+		printstring("panic: runtime error: slice out of range\n")
+		abort()
+	}
+}