C++: Add block assignment expression to the database schema

These can under some circumstances be generated by the frontend as part
of compiler generated copy constructors and assignment operators.

Author: jketema

cpp/ql/lib/semmlecode.cpp.dbscheme

@@ -1302,7 +1302,7 @@ funbind(
 
 @assign_op_expr = @assign_arith_expr | @assign_bitwise_expr
 
-@assign_expr = @assignexpr | @assign_op_expr
+@assign_expr = @assignexpr | @assign_op_expr | @blockassignexpr
 
 /*
   case @allocator.form of
@@ -1660,6 +1660,7 @@ case @expr.kind of
 | 332 = @hasuniqueobjectrepresentations
 | 333 = @builtinbitcast
 | 334 = @builtinshuffle
+| 335 = @blockassignexpr
 ;
 
 @var_args_expr = @vastartexpr

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

@@ -13985,6 +13985,24 @@ ir.cpp:
 #-----|         Type = [RValueReferenceType] A &&
 #-----|   getEntryPoint(): [BlockStmt] { ... }
 #-----|     getStmt(0): [ExprStmt] ExprStmt
+#-----|       getExpr(): (no string representation)
+#-----|           Type = [VoidType] void
+#-----|           ValueCategory = prvalue
+#-----|         getLValue(): [PointerFieldAccess] e
+#-----|             Type = [ArrayType] enum <unnamed>[1]
+#-----|             ValueCategory = lvalue
+#-----|           getQualifier(): [ThisExpr] this
+#-----|               Type = [PointerType] A *
+#-----|               ValueCategory = prvalue(load)
+#-----|         getRValue(): [ReferenceFieldAccess] e
+#-----|             Type = [ArrayType] enum <unnamed>[1]
+#-----|             ValueCategory = lvalue
+#-----|           getQualifier(): [VariableAccess] (unnamed parameter 0)
+#-----|               Type = [RValueReferenceType] A &&
+#-----|               ValueCategory = prvalue(load)
+#-----|           getQualifier().getFullyConverted(): [ReferenceDereferenceExpr] (reference dereference)
+#-----|               Type = [Class] A
+#-----|               ValueCategory = lvalue
 #-----|     getStmt(1): [ReturnStmt] return ...
 #-----|       getExpr(): [PointerDereferenceExpr] * ...
 #-----|           Type = [Class] A

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

@@ -7,6 +7,8 @@ duplicateChiOperand
 sideEffectWithoutPrimary
 instructionWithoutSuccessor
 | ../../../include/memory.h:68:25:68:33 | CopyValue: (reference to) | Instruction 'CopyValue: (reference to)' has no successors in function '$@'. | ../../../include/memory.h:67:5:67:5 | void std::unique_ptr<int, std::default_delete<int>>::~unique_ptr() | void std::unique_ptr<int, std::default_delete<int>>::~unique_ptr() |
+| file://:0:0:0:0 | FieldAddress: e | Instruction 'FieldAddress: e' has no successors in function '$@'. | ir.cpp:1834:11:1834:11 | block_assignment::A& block_assignment::A::operator=(block_assignment::A&&) | block_assignment::A& block_assignment::A::operator=(block_assignment::A&&) |
+| file://:0:0:0:0 | FieldAddress: e | Instruction 'FieldAddress: e' has no successors in function '$@'. | ir.cpp:1834:11:1834:11 | block_assignment::A& block_assignment::A::operator=(block_assignment::A&&) | block_assignment::A& block_assignment::A::operator=(block_assignment::A&&) |
 | file://:0:0:0:0 | InitializeIndirection: (unnamed parameter 0) | Instruction 'InitializeIndirection: (unnamed parameter 0)' has no successors in function '$@'. | ir.cpp:1834:11:1834:11 | block_assignment::A& block_assignment::A::operator=(block_assignment::A&&) | block_assignment::A& block_assignment::A::operator=(block_assignment::A&&) |
 ambiguousSuccessors
 unexplainedLoop

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

@@ -9812,18 +9812,29 @@ ir.cpp:
 #-----|     mu0_4(unknown)          = InitializeIndirection[(unnamed parameter 0)] : &:r0_3
 
 #-----|   Block 1
-#-----|     r0_5(glval<A &>)     = VariableAddress[#return]                 : 
-#-----|     r0_6(glval<unknown>) = VariableAddress[#this]                   : 
-#-----|     r0_7(A *)            = Load[#this]                              : &:r0_6, ~m?
-#-----|     r0_8(glval<A>)       = CopyValue                                : r0_7
-#-----|     r0_9(A &)            = CopyValue                                : r0_8
-#-----|     mu0_10(A &)          = Store[#return]                           : &:r0_5, r0_9
-# 1834|     v1834_8(void)        = ReturnIndirection[#this]                 : &:r1834_6, ~m?
-#-----|     v0_11(void)          = ReturnIndirection[(unnamed parameter 0)] : &:r0_3, ~m?
-# 1834|     r1834_9(glval<A &>)  = VariableAddress[#return]                 : 
-# 1834|     v1834_10(void)       = ReturnValue                              : &:r1834_9, ~m?
-# 1834|     v1834_11(void)       = AliasedUse                               : ~m?
-# 1834|     v1834_12(void)       = ExitFunction                             : 
+#-----|     r0_5(glval<unknown>)           = VariableAddress[#this] : 
+#-----|     r0_6(A *)                      = Load[#this]            : &:r0_5, ~m?
+#-----|     r0_7(glval<enum <unnamed>[1]>) = FieldAddress[e]        : r0_6
+
+#-----|   Block 2
+#-----|     r0_8(glval<A &&>)               = VariableAddress[(unnamed parameter 0)] : 
+#-----|     r0_9(A &&)                      = Load[(unnamed parameter 0)]            : &:r0_8, ~m?
+#-----|     r0_10(glval<A>)                 = CopyValue                              : r0_9
+#-----|     r0_11(glval<enum <unnamed>[1]>) = FieldAddress[e]                        : r0_10
+
+#-----|   Block 3
+#-----|     r0_12(glval<A &>)     = VariableAddress[#return]                 : 
+#-----|     r0_13(glval<unknown>) = VariableAddress[#this]                   : 
+#-----|     r0_14(A *)            = Load[#this]                              : &:r0_13, ~m?
+#-----|     r0_15(glval<A>)       = CopyValue                                : r0_14
+#-----|     r0_16(A &)            = CopyValue                                : r0_15
+#-----|     mu0_17(A &)           = Store[#return]                           : &:r0_12, r0_16
+# 1834|     v1834_8(void)         = ReturnIndirection[#this]                 : &:r1834_6, ~m?
+#-----|     v0_18(void)           = ReturnIndirection[(unnamed parameter 0)] : &:r0_3, ~m?
+# 1834|     r1834_9(glval<A &>)   = VariableAddress[#return]                 : 
+# 1834|     v1834_10(void)        = ReturnValue                              : &:r1834_9, ~m?
+# 1834|     v1834_11(void)        = AliasedUse                               : ~m?
+# 1834|     v1834_12(void)        = ExitFunction                             : 
 
 # 1839| block_assignment::B& block_assignment::B::operator=(block_assignment::B&&)
 # 1839|   Block 0