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C++: Handle inheritance conversions in IR GVN

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This commit is contained in:
Dave Bartolomeo
2018-09-20 08:00:38 -07:00
parent bd156757d3
commit 27cee9bd80
6 changed files with 132 additions and 24 deletions
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3
cpp/ql/test/library-tests/valuenumbering/GlobalValueNumbering/GlobalValueNumbering.expected
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@@ -27,3 +27,6 @@
| test.cpp:62:5:62:10 | result | 62:c5-c10 65:c10-c15 |
| test.cpp:77:20:77:30 | (signed short)... | 77:c20-c30 79:c7-c7 |
| test.cpp:79:11:79:14 | vals | 79:c11-c14 79:c24-c27 |
| test.cpp:105:11:105:12 | (Base *)... | 105:c11-c12 106:c14-c35 107:c11-c12 |
| test.cpp:105:11:105:12 | pd | 105:c11-c12 106:c33-c34 |
| test.cpp:105:15:105:15 | b | 105:c15-c15 107:c15-c15 109:c10-c10 |

59
cpp/ql/test/library-tests/valuenumbering/GlobalValueNumbering/ir_gvn.expected
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@@ -653,3 +653,62 @@ test.cpp:
# 91| v0_12(void) = ReturnValue : r0_11, m0_10
# 91| v0_13(void) = UnmodeledUse : mu*
# 91| v0_14(void) = ExitFunction :
# 104| inheritanceConversions(Derived *) -> int
# 104| Block 0
# 104| v0_0(void) = EnterFunction :
# 104| mu0_1(unknown) = UnmodeledDefinition :
# 104| valnum = unique
# 104| r0_2(glval<Derived *>) = VariableAddress[pd] :
# 104| valnum = r0_2
# 104| m0_3(Derived *) = InitializeParameter[pd] : r0_2
# 104| valnum = m0_3
# 105| r0_4(glval<int>) = VariableAddress[x] :
# 105| valnum = unique
# 105| r0_5(glval<Derived *>) = VariableAddress[pd] :
# 105| valnum = r0_2
# 105| r0_6(Derived *) = Load : r0_5, m0_3
# 105| valnum = m0_3
# 105| r0_7(Base *) = ConvertToBase[Derived : Base] : r0_6
# 105| valnum = r0_7
# 105| r0_8(glval<int>) = FieldAddress[b] : r0_7
# 105| valnum = r0_8
# 105| r0_9(int) = Load : r0_8, mu0_1
# 105| valnum = r0_9
# 105| m0_10(int) = Store : r0_4, r0_9
# 105| valnum = r0_9
# 106| r0_11(glval<Base *>) = VariableAddress[pb] :
# 106| valnum = r0_11
# 106| r0_12(glval<Derived *>) = VariableAddress[pd] :
# 106| valnum = r0_2
# 106| r0_13(Derived *) = Load : r0_12, m0_3
# 106| valnum = m0_3
# 106| r0_14(Base *) = ConvertToBase[Derived : Base] : r0_13
# 106| valnum = r0_7
# 106| m0_15(Base *) = Store : r0_11, r0_14
# 106| valnum = r0_7
# 107| r0_16(glval<int>) = VariableAddress[y] :
# 107| valnum = r0_16
# 107| r0_17(glval<Base *>) = VariableAddress[pb] :
# 107| valnum = r0_11
# 107| r0_18(Base *) = Load : r0_17, m0_15
# 107| valnum = r0_7
# 107| r0_19(glval<int>) = FieldAddress[b] : r0_18
# 107| valnum = r0_8
# 107| r0_20(int) = Load : r0_19, mu0_1
# 107| valnum = r0_20
# 107| m0_21(int) = Store : r0_16, r0_20
# 107| valnum = r0_20
# 109| r0_22(glval<int>) = VariableAddress[#return] :
# 109| valnum = r0_22
# 109| r0_23(glval<int>) = VariableAddress[y] :
# 109| valnum = r0_16
# 109| r0_24(int) = Load : r0_23, m0_21
# 109| valnum = r0_20
# 109| m0_25(int) = Store : r0_22, r0_24
# 109| valnum = r0_20
# 104| r0_26(glval<int>) = VariableAddress[#return] :
# 104| valnum = r0_22
# 104| v0_27(void) = ReturnValue : r0_26, m0_25
# 104| v0_28(void) = UnmodeledUse : mu*
# 104| v0_29(void) = ExitFunction :

16
cpp/ql/test/library-tests/valuenumbering/GlobalValueNumbering/test.cpp
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@@ -92,3 +92,19 @@ int regression_test00() {
int x = x = 10;
return x;
}
struct Base {
int b;
};
struct Derived : Base {
int d;
};
int inheritanceConversions(Derived* pd) {
int x = pd->b;
Base* pb = static_cast<Base*>(pd);
int y = pb->b;
return y;
}