Checkin of Vikram's ggfuncptr.c test adapted for automatic checking

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7324 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Analysis/DSGraph/GlobalsGraphFuncPtr.ll b/test/Analysis/DSGraph/GlobalsGraphFuncPtr.ll
new file mode 100644 (file)
index 0000000..cb974a9
--- /dev/null
+++ b/test/Analysis/DSGraph/GlobalsGraphFuncPtr.ll
@@ -0,0 +1,66 @@
+; Test resolvable and unresolvable calls through function pointers:
+; -- both should be retained in function graphs until resolved or until main
+; -- former should get resolved in or before main() and never appear in GG
+; -- latter should remain unresolved in main() and copied to GG
+; -- globals in GG pointed to by latter should be marked I, but not other nodes
+;
+; RUN: analyze %s -datastructure-gc -dsgc-check-flags=KnownPtr:S,UnknownPtr:SI -dsgc-dspass=bu
+
+%Z = internal global int 0
+%X = internal global int 0
+%M = internal global int 0
+%.str_1 = internal constant [9 x sbyte] c"&Z = %p\0A\00"
+
+implementation
+
+declare int %printf(sbyte*, ...)
+declare void %exit_dummy(int*)
+
+internal void %makeCalls(void (int*)* %GpKnown.1, void (int*)* %GpUnknown.1,
+                         int* %GpKnownPtr, int* %GpUnknownPtr) {
+       %tmp.0 = load int* %Z
+       %tmp.1.not = setne int %tmp.0, 0
+       br bool %tmp.1.not, label %else, label %then
+
+then:
+       ; pass to exit_dummy: never resolved
+       call void %GpUnknown.1( int* %GpUnknownPtr )
+       %tmp.61 = load int* %Z
+       %inc1 = add int %tmp.61, 1
+       store int %inc1, int* %Z
+       %tmp.71 = call int (sbyte*, ...)* %printf( sbyte* getelementptr ([9 x sbyte]* %.str_1, long 0, long 0), int* %Z )
+       ret void
+
+else:
+       ; pass to knownF: resolved in main
+       call void %GpKnown.1( int* %GpKnownPtr )
+       %tmp.6 = load int* %Z
+       %inc = add int %tmp.6, 1
+       store int %inc, int* %Z
+
+       ; "known external": resolved here
+       %tmp.7 = call int (sbyte*, ...)* %printf( sbyte* getelementptr ([9 x sbyte]* %.str_1, long 0, long 0), int* %Z )
+       ret void
+}
+
+internal void %knownF(int* %Y.1) {
+       %tmp.1 = seteq int* %Y.1, null
+       br bool %tmp.1, label %then, label %UnifiedExitNode
+
+then:
+       call void %knownF( int* %Y.1 )   ; direct call to self: resolved here
+       br label %UnifiedExitNode
+
+UnifiedExitNode:
+       ret void
+}
+
+int %main(int %argc.1) {
+        %KnownPtr = alloca int
+        %UnknownPtr = alloca int
+       store int 1, int* %Z
+       call void %makeCalls( void (int*)* %knownF, void (int*)* %exit_dummy,
+                              int* %KnownPtr, int* %UnknownPtr )
+       ret int 0
+}
+