8b4140d712
flag as GCC uses: -fstrict-enums). There is a *lot* of code making unwarranted assumptions about the underlying type of enums, and it doesn't seem entirely reasonable to eagerly break all of it. Much more importantly, the current state of affairs is *very* good at optimizing based upon this information, which causes failures that are very distant from the actual enum. Before we push for enabling this by default, I think we need to implement -fcatch-undefined-behavior support for instrumenting and trapping whenever we store or load a value outside of the range. That way we can track down the misbehaving code very quickly. I discussed this with Rafael, and currently the only important cases he is aware of are the bool range-based optimizations which are staying hard enabled. We've not seen any issue with those either, and they are much more important for performance. llvm-svn: 153550
147 lines
3.2 KiB
C++
147 lines
3.2 KiB
C++
// RUN: %clang_cc1 %s -emit-llvm -O1 -relaxed-aliasing -fstrict-enums -std=c++11 -o - | FileCheck %s
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// RUN: %clang_cc1 %s -emit-llvm -O1 -relaxed-aliasing -std=c++11 -o - | FileCheck --check-prefix=NO-STRICT-ENUMS %s
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bool f(bool *x) {
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return *x;
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}
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// CHECK: define zeroext i1 @_Z1fPb
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// CHECK: load i8* %{{.*}}, align 1, !range !0
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// Only enum-tests follow. Ensure that after the bool test, no further range
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// metadata shows up when strict enums are disabled.
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// NO-STRICT-ENUMS: define zeroext i1 @_Z1fPb
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// NO-STRICT-ENUMS: load i8* %{{.*}}, align 1, !range !0
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// NO-STRICT-ENUMS-NOT: !range
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enum e1 { };
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e1 g1(e1 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g1P2e1
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// CHECK: load i32* %x, align 4, !range !1
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enum e2 { e2_a = 0 };
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e2 g2(e2 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g2P2e2
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// CHECK: load i32* %x, align 4, !range !1
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enum e3 { e3_a = 16 };
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e3 g3(e3 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g3P2e3
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// CHECK: load i32* %x, align 4, !range !2
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enum e4 { e4_a = -16};
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e4 g4(e4 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g4P2e4
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// CHECK: load i32* %x, align 4, !range !3
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enum e5 { e5_a = -16, e5_b = 16};
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e5 g5(e5 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g5P2e5
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// CHECK: load i32* %x, align 4, !range !4
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enum e6 { e6_a = -1 };
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e6 g6(e6 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g6P2e6
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// CHECK: load i32* %x, align 4, !range !5
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enum e7 { e7_a = -16, e7_b = 2};
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e7 g7(e7 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g7P2e7
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// CHECK: load i32* %x, align 4, !range !3
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enum e8 { e8_a = -17};
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e8 g8(e8 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g8P2e8
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// CHECK: load i32* %x, align 4, !range !4
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enum e9 { e9_a = 17};
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e9 g9(e9 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z2g9P2e9
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// CHECK: load i32* %x, align 4, !range !2
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enum e10 { e10_a = -16, e10_b = 32};
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e10 g10(e10 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z3g10P3e10
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// CHECK: load i32* %x, align 4, !range !6
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enum e11 {e11_a = 4294967296 };
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enum e11 g11(enum e11 *x) {
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return *x;
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}
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// CHECK: define i64 @_Z3g11P3e11
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// CHECK: load i64* %x, align {{[84]}}, !range !7
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enum e12 {e12_a = 9223372036854775808U };
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enum e12 g12(enum e12 *x) {
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return *x;
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}
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// CHECK: define i64 @_Z3g12P3e12
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// CHECK: load i64* %x, align {{[84]}}
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// CHECK-NOT: range
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// CHECK: ret
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enum e13 : char {e13_a = -1 };
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e13 g13(e13 *x) {
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return *x;
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}
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// CHECK: define signext i8 @_Z3g13P3e13
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// CHECK: load i8* %x, align 1
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// CHECK-NOT: range
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// CHECK: ret
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enum class e14 {e14_a = 1};
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e14 g14(e14 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z3g14P3e14
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// CHECK: load i32* %x, align 4
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// CHECK-NOT: range
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// CHECK: ret
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enum e15 { e15_a = 2147483648 };
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e15 g15(e15 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z3g15P3e15
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// CHECK: load i32* %x, align 4
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// CHECK-NOT: range
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// CHECK: ret
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enum e16 { e16_a = -2147483648 };
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e16 g16(e16 *x) {
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return *x;
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}
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// CHECK: define i32 @_Z3g16P3e16
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// CHECK: load i32* %x, align 4
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// CHECK-NOT: range
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// CHECK: ret
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// CHECK: !0 = metadata !{i8 0, i8 2}
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// CHECK: !1 = metadata !{i32 0, i32 1}
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// CHECK: !2 = metadata !{i32 0, i32 32}
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// CHECK: !3 = metadata !{i32 -16, i32 16}
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// CHECK: !4 = metadata !{i32 -32, i32 32}
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// CHECK: !5 = metadata !{i32 -1, i32 1}
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// CHECK: !6 = metadata !{i32 -64, i32 64}
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// CHECK: !7 = metadata !{i64 0, i64 8589934592}
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