cmd/gc: suspend safemode during typecheck of inlined bodies.

Should be obviously correct.  Includes minimal test case.
A future CL should clear up the logic around typecheckok and importpkg != nil someday.

R=rsc, dsymonds, rsc
CC=golang-dev
http://codereview.appspot.com/5652057

4 files changed, 46 insertions, 0 deletions

diff --git a/test/safe/main.go b/test/safe/main.go
new file mode 100644
index 000000000..d173ed926
--- /dev/null
+++ b/test/safe/main.go
@@ -0,0 +1,14 @@
+// true
+
+// Copyright 2012 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 main
+
+// can't use local path with -u, use -I. instead
+import "pkg"  // ERROR "import unsafe package"
+
+func main() {
+	print(pkg.Float32bits(1.0))
+}
diff --git a/test/safe/nousesafe.go b/test/safe/nousesafe.go
new file mode 100644
index 000000000..f61e7fe4f
--- /dev/null
+++ b/test/safe/nousesafe.go
@@ -0,0 +1,8 @@
+// $G $D/pkg.go && pack grc pkg.a pkg.$A 2> /dev/null && rm pkg.$A && errchk $G -I. -u $D/main.go
+// rm -f pkg.a
+
+// Copyright 2012 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 ignored
diff --git a/test/safe/pkg.go b/test/safe/pkg.go
new file mode 100644
index 000000000..bebc43a21
--- /dev/null
+++ b/test/safe/pkg.go
@@ -0,0 +1,16 @@
+// true
+
+// Copyright 2012 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.
+
+// a package that uses unsafe on the inside but not in it's api
+
+package pkg
+
+import "unsafe"
+
+// this should be inlinable
+func Float32bits(f float32) uint32 {
+	return *(*uint32)(unsafe.Pointer(&f))
+}
\ No newline at end of file
diff --git a/test/safe/usesafe.go b/test/safe/usesafe.go
new file mode 100644
index 000000000..07c13c1c3
--- /dev/null
+++ b/test/safe/usesafe.go
@@ -0,0 +1,8 @@
+// $G $D/pkg.go && pack grcS pkg.a pkg.$A 2> /dev/null && rm pkg.$A && $G -I. -u $D/main.go
+// rm -f pkg.a
+
+// Copyright 2012 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 ignored