C++: Add IR test case that shows regression after frontend update

Author: jketema

cpp/ql/test/library-tests/ir/ir/PrintAST.expected

@@ -1798,6 +1798,23 @@ ir.c:
 #   10|                 Type = [CTypedefType] MyCoords
 #   10|                 ValueCategory = lvalue
 #   11|     getStmt(3): [ReturnStmt] return ...
+#   13| [TopLevelFunction] void CStyleCast(void*)
+#   13|   <params>: 
+#   13|     getParameter(0): [Parameter] src
+#   13|         Type = [VoidPointerType] void *
+#   14|   getEntryPoint(): [BlockStmt] { ... }
+#   15|     getStmt(0): [DeclStmt] declaration
+#   15|       getDeclarationEntry(0): [VariableDeclarationEntry] definition of dst
+#   15|           Type = [CharPointerType] char *
+#   15|         getVariable().getInitializer(): [Initializer] initializer for dst
+#   15|           getExpr(): [VariableAccess] src
+#   15|               Type = [VoidPointerType] void *
+#   15|               ValueCategory = prvalue(load)
+#   15|           getExpr().getFullyConverted(): [CStyleCast] (char *)...
+#   15|               Conversion = [PointerConversion] pointer conversion
+#   15|               Type = [CharPointerType] char *
+#   15|               ValueCategory = prvalue
+#   16|     getStmt(1): [ReturnStmt] return ...
 ir.cpp:
 #    1| [TopLevelFunction] void Constants()
 #    1|   <params>: 

cpp/ql/test/library-tests/ir/ir/ir.c

@@ -9,3 +9,10 @@ void MyCoordsTest(int pos) {
   coords.x = coords.y = pos + 1;
   coords.x = getX(&coords);
 }
+
+void CStyleCast(void *src)
+{
+    char *dst = (char*)src;
+}
+
+// semmle-extractor-options: --microsoft

cpp/ql/test/library-tests/ir/ir/operand_locations.expected

@@ -978,6 +978,20 @@
 | ir.c:10:19:10:25 | ChiTotal | total:m9_13 |
 | ir.c:10:19:10:25 | SideEffect | ~m9_13 |
 | ir.c:10:20:10:25 | Unary | r10_2 |
+| ir.c:13:6:13:15 | ChiPartial | partial:m13_3 |
+| ir.c:13:6:13:15 | ChiTotal | total:m13_2 |
+| ir.c:13:6:13:15 | SideEffect | m13_3 |
+| ir.c:13:23:13:25 | Address | &:r13_5 |
+| ir.c:13:23:13:25 | Address | &:r13_5 |
+| ir.c:13:23:13:25 | Address | &:r13_7 |
+| ir.c:13:23:13:25 | Address | &:r13_7 |
+| ir.c:13:23:13:25 | Load | m13_6 |
+| ir.c:13:23:13:25 | SideEffect | m13_8 |
+| ir.c:15:11:15:13 | Address | &:r15_1 |
+| ir.c:15:17:15:26 | StoreValue | r15_4 |
+| ir.c:15:24:15:26 | Address | &:r15_2 |
+| ir.c:15:24:15:26 | Load | m13_6 |
+| ir.c:15:24:15:26 | Unary | r15_3 |
 | ir.cpp:1:6:1:14 | ChiPartial | partial:m1_3 |
 | ir.cpp:1:6:1:14 | ChiTotal | total:m1_2 |
 | ir.cpp:1:6:1:14 | SideEffect | m1_3 |

cpp/ql/test/library-tests/ir/ir/raw_ir.expected

@@ -766,6 +766,26 @@ ir.c:
 #    7|     v7_7(void)                                 = AliasedUse                   : ~m?
 #    7|     v7_8(void)                                 = ExitFunction                 : 
 
+#   13| void CStyleCast(void*)
+#   13|   Block 0
+#   13|     v13_1(void)          = EnterFunction              : 
+#   13|     mu13_2(unknown)      = AliasedDefinition          : 
+#   13|     mu13_3(unknown)      = InitializeNonLocal         : 
+#   13|     r13_4(glval<void *>) = VariableAddress[src]       : 
+#   13|     mu13_5(void *)       = InitializeParameter[src]   : &:r13_4
+#   13|     r13_6(void *)        = Load[src]                  : &:r13_4, ~m?
+#   13|     mu13_7(unknown)      = InitializeIndirection[src] : &:r13_6
+#   15|     r15_1(glval<char *>) = VariableAddress[dst]       : 
+#   15|     r15_2(glval<void *>) = VariableAddress[src]       : 
+#   15|     r15_3(void *)        = Load[src]                  : &:r15_2, ~m?
+#   15|     r15_4(char *)        = Convert                    : r15_3
+#   15|     mu15_5(char *)       = Store[dst]                 : &:r15_1, r15_4
+#   16|     v16_1(void)          = NoOp                       : 
+#   13|     v13_8(void)          = ReturnIndirection[src]     : &:r13_6, ~m?
+#   13|     v13_9(void)          = ReturnVoid                 : 
+#   13|     v13_10(void)         = AliasedUse                 : ~m?
+#   13|     v13_11(void)         = ExitFunction               : 
+
 ir.cpp:
 #    1| void Constants()
 #    1|   Block 0