C++: Add assignment operation IR test where the result is being used

Author: jketema

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

@@ -14562,6 +14562,40 @@ ir.cpp:
 # 1930|               Value = [Literal] 40
 # 1930|               ValueCategory = prvalue
 # 1931|     getStmt(2): [ReturnStmt] return ...
+# 1933| [TopLevelFunction] void test_assign_with_assign_operation()
+# 1933|   <params>: 
+# 1933|   getEntryPoint(): [BlockStmt] { ... }
+# 1934|     getStmt(0): [DeclStmt] declaration
+# 1934|       getDeclarationEntry(0): [VariableDeclarationEntry] definition of i
+# 1934|           Type = [IntType] int
+# 1934|       getDeclarationEntry(1): [VariableDeclarationEntry] definition of j
+# 1934|           Type = [IntType] int
+# 1934|         getVariable().getInitializer(): [Initializer] initializer for j
+# 1934|           getExpr(): [Literal] 0
+# 1934|               Type = [IntType] int
+# 1934|               Value = [Literal] 0
+# 1934|               ValueCategory = prvalue
+# 1935|     getStmt(1): [ExprStmt] ExprStmt
+# 1935|       getExpr(): [AssignExpr] ... = ...
+# 1935|           Type = [IntType] int
+# 1935|           ValueCategory = lvalue
+# 1935|         getLValue(): [VariableAccess] i
+# 1935|             Type = [IntType] int
+# 1935|             ValueCategory = lvalue
+# 1935|         getRValue(): [AssignAddExpr] ... += ...
+# 1935|             Type = [IntType] int
+# 1935|             ValueCategory = prvalue
+# 1935|           getLValue(): [VariableAccess] j
+# 1935|               Type = [IntType] int
+# 1935|               ValueCategory = lvalue
+# 1935|           getRValue(): [Literal] 40
+# 1935|               Type = [IntType] int
+# 1935|               Value = [Literal] 40
+# 1935|               ValueCategory = prvalue
+# 1935|         getRValue().getFullyConverted(): [ParenthesisExpr] (...)
+# 1935|             Type = [IntType] int
+# 1935|             ValueCategory = prvalue
+# 1936|     getStmt(2): [ReturnStmt] return ...
 perf-regression.cpp:
 #    4| [CopyAssignmentOperator] Big& Big::operator=(Big const&)
 #    4|   <params>: 

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

@@ -1930,4 +1930,9 @@ void test_double_assign() {
   i = j = 40;
 }
 
+void test_assign_with_assign_operation() {
+  int i, j = 0;
+  i = (j += 40);
+}
+
 // semmle-extractor-options: -std=c++17 --clang

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

@@ -8877,6 +8877,20 @@
 | ir.cpp:1930:7:1930:12 | StoreValue | r1930_4 |
 | ir.cpp:1930:11:1930:12 | StoreValue | r1930_1 |
 | ir.cpp:1930:11:1930:12 | Unary | r1930_1 |
+| ir.cpp:1933:6:1933:38 | ChiPartial | partial:m1933_3 |
+| ir.cpp:1933:6:1933:38 | ChiTotal | total:m1933_2 |
+| ir.cpp:1933:6:1933:38 | SideEffect | m1933_3 |
+| ir.cpp:1934:7:1934:7 | Address | &:r1934_1 |
+| ir.cpp:1934:10:1934:10 | Address | &:r1934_3 |
+| ir.cpp:1934:13:1934:14 | StoreValue | r1934_4 |
+| ir.cpp:1935:3:1935:3 | Address | &:r1935_6 |
+| ir.cpp:1935:8:1935:8 | Address | &:r1935_2 |
+| ir.cpp:1935:8:1935:8 | Address | &:r1935_2 |
+| ir.cpp:1935:8:1935:8 | Left | r1935_3 |
+| ir.cpp:1935:8:1935:8 | Load | m1934_5 |
+| ir.cpp:1935:8:1935:14 | StoreValue | r1935_4 |
+| ir.cpp:1935:8:1935:14 | StoreValue | r1935_4 |
+| ir.cpp:1935:13:1935:14 | Right | r1935_1 |
 | perf-regression.cpp:6:3:6:5 | Address | &:r6_5 |
 | perf-regression.cpp:6:3:6:5 | Address | &:r6_5 |
 | perf-regression.cpp:6:3:6:5 | Address | &:r6_7 |

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

@@ -10244,6 +10244,28 @@ ir.cpp:
 # 1928|     v1928_5(void)       = AliasedUse         : ~m?
 # 1928|     v1928_6(void)       = ExitFunction       : 
 
+# 1933| void test_assign_with_assign_operation()
+# 1933|   Block 0
+# 1933|     v1933_1(void)       = EnterFunction      : 
+# 1933|     mu1933_2(unknown)   = AliasedDefinition  : 
+# 1933|     mu1933_3(unknown)   = InitializeNonLocal : 
+# 1934|     r1934_1(glval<int>) = VariableAddress[i] : 
+# 1934|     mu1934_2(int)       = Uninitialized[i]   : &:r1934_1
+# 1934|     r1934_3(glval<int>) = VariableAddress[j] : 
+# 1934|     r1934_4(int)        = Constant[0]        : 
+# 1934|     mu1934_5(int)       = Store[j]           : &:r1934_3, r1934_4
+# 1935|     r1935_1(int)        = Constant[40]       : 
+# 1935|     r1935_2(glval<int>) = VariableAddress[j] : 
+# 1935|     r1935_3(int)        = Load[j]            : &:r1935_2, ~m?
+# 1935|     r1935_4(int)        = Add                : r1935_3, r1935_1
+# 1935|     mu1935_5(int)       = Store[j]           : &:r1935_2, r1935_4
+# 1935|     r1935_6(glval<int>) = VariableAddress[i] : 
+# 1935|     mu1935_7(int)       = Store[i]           : &:r1935_6, r1935_4
+# 1936|     v1936_1(void)       = NoOp               : 
+# 1933|     v1933_4(void)       = ReturnVoid         : 
+# 1933|     v1933_5(void)       = AliasedUse         : ~m?
+# 1933|     v1933_6(void)       = ExitFunction       : 
+
 perf-regression.cpp:
 #    6| void Big::Big()
 #    6|   Block 0