69cd776e1e
arguments. * Adds 'nonnull' and 'dereferenceable(N)' to 'this' pointer arguments * Gates 'nonnull' on -f(no-)delete-null-pointer-checks * Introduces this-nonnull.cpp and microsoft-abi-this-nullable.cpp tests to explicitly test the behavior of this change * Refactors hundreds of over-constrained clang tests to permit these attributes, where needed * Updates Clang12 patch notes mentioning this change Reviewed-by: rsmith, jdoerfert Differential Revision: https://reviews.llvm.org/D17993
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
// RUN: %clang_cc1 -triple armv7l-unknown-linux-gnueabihf -emit-llvm -O1 -disable-llvm-passes -std=c++03 %s -o - | FileCheck %s --implicit-check-not=llvm.lifetime
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class S {
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char *ptr;
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unsigned int len;
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};
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class T {
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S left;
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S right;
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public:
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T(const char s[]);
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T(S);
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T concat(const T &Suffix) const;
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const char * str() const;
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};
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const char * f(S s)
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{
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// It's essential that the lifetimes of all three T temporaries here are
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// overlapping. They must all remain alive through the call to str().
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//
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// CHECK: [[T1:%.*]] = alloca %class.T, align 4
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// CHECK: [[T2:%.*]] = alloca %class.T, align 4
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// CHECK: [[T3:%.*]] = alloca %class.T, align 4
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//
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// FIXME: We could defer starting the lifetime of the return object of concat
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// until the call.
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// CHECK: [[T1i8:%.*]] = bitcast %class.T* [[T1]] to i8*
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// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T1i8]])
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//
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// CHECK: [[T2i8:%.*]] = bitcast %class.T* [[T2]] to i8*
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// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T2i8]])
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// CHECK: [[T4:%.*]] = call %class.T* @_ZN1TC1EPKc(%class.T* {{[^,]*}} [[T2]], i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0))
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//
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// CHECK: [[T3i8:%.*]] = bitcast %class.T* [[T3]] to i8*
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// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T3i8]])
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// CHECK: [[T5:%.*]] = call %class.T* @_ZN1TC1E1S(%class.T* {{[^,]*}} [[T3]], [2 x i32] %{{.*}})
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//
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// CHECK: call void @_ZNK1T6concatERKS_(%class.T* sret(%class.T) align 4 [[T1]], %class.T* {{[^,]*}} [[T2]], %class.T* nonnull align 4 dereferenceable(16) [[T3]])
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// CHECK: [[T6:%.*]] = call i8* @_ZNK1T3strEv(%class.T* {{[^,]*}} [[T1]])
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//
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// CHECK: call void @llvm.lifetime.end.p0i8(
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// CHECK: call void @llvm.lifetime.end.p0i8(
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// CHECK: call void @llvm.lifetime.end.p0i8(
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// CHECK: ret i8* [[T6]]
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return T("[").concat(T(s)).str();
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}
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// CHECK: declare {{.*}}llvm.lifetime.start
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// CHECK: declare {{.*}}llvm.lifetime.end
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