New testcases for inlining invoke instructions

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8103 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/Inline/invoke_test-1.ll

@@ -0,0 +1,22 @@
+; Test that we can invoke a simple function, turning the calls in it into invoke
+; instructions
+
+; RUN: as < %s | opt -inline | dis | not grep 'call[^e]'
+
+declare void %might_throw()
+
+implementation
+
+internal void %callee() {
+	call void %might_throw()
+	ret void
+}
+
+; caller returns true if might_throw throws an exception...
+int %caller() {
+	invoke void %callee() to label %cont except label %exc
+cont:
+	ret int 0
+exc:
+	ret int 1
+}

test/Transforms/Inline/invoke_test-2.ll

@@ -0,0 +1,27 @@
+; Test that if an invoked function is inlined, and if that function cannot
+; throw, that the dead handler is now unreachable.
+
+; RUN: as < %s | opt -inline -simplifycfg | dis | not grep UnreachableExceptionHandler
+
+declare void %might_throw()
+
+implementation
+
+internal int %callee() {
+	invoke void %might_throw() to label %cont except label %exc
+cont:
+	ret int 0
+exc:
+	; This just consumes the exception!
+	ret int 1
+}
+
+; caller returns true if might_throw throws an exception...
+int %caller() {
+	%X = invoke int %callee() to label %cont 
+		except label %UnreachableExceptionHandler
+cont:
+	ret int %X
+UnreachableExceptionHandler:
+	ret int -1   ; This is dead!
+}

test/Transforms/Inline/invoke_test-3.ll

@@ -0,0 +1,29 @@
+; Test that any rethrown exceptions in an inlined function are automatically
+; turned into branches to the invoke destination.
+
+; RUN: as < %s | opt -inline | dis | not grep 'call void %llvm.exc.rethrow'
+
+declare void %might_throw()
+declare void %llvm.exc.rethrow()
+
+implementation
+
+internal int %callee() {
+	invoke void %might_throw() to label %cont except label %exc
+cont:
+	ret int 0
+exc:	; This just rethrows the exception!
+	call void %llvm.exc.rethrow()
+	ret int 0
+}
+
+; caller returns true if might_throw throws an exception...
+int %caller() {
+	%X = invoke int %callee() to label %cont 
+		except label %Handler
+cont:
+	ret int %X
+Handler:
+	; This consumes an exception thrown by might_throw
+	ret int -1
+}