c23b4fbdbb
Now that #149310 has restricted lifetime intrinsics to only work on allocas, we can also drop the explicit size argument. Instead, the size is implied by the alloca. This removes the ability to only mark a prefix of an alloca alive/dead. We never used that capability, so we should remove the need to handle that possibility everywhere (though many key places, including stack coloring, did not actually respect this).
52 lines
1.6 KiB
C++
52 lines
1.6 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: call void @llvm.lifetime.start.p0(ptr [[T1]])
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//
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// CHECK: call void @llvm.lifetime.start.p0(ptr [[T2]])
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// CHECK: [[T4:%.*]] = call noundef ptr @_ZN1TC1EPKc(ptr {{[^,]*}} [[T2]], ptr noundef @.str)
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//
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// CHECK: call void @llvm.lifetime.start.p0(ptr [[T3]])
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// CHECK: [[T5:%.*]] = call noundef ptr @_ZN1TC1E1S(ptr {{[^,]*}} [[T3]], [2 x i32] %{{.*}})
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//
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// CHECK: call void @_ZNK1T6concatERKS_(ptr dead_on_unwind writable sret(%class.T) align 4 [[T1]], ptr {{[^,]*}} [[T2]], ptr noundef nonnull align 4 dereferenceable(16) [[T3]])
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// CHECK: [[T6:%.*]] = call noundef ptr @_ZNK1T3strEv(ptr {{[^,]*}} [[T1]])
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//
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// CHECK: call void @llvm.lifetime.end.p0(
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// CHECK: call void @llvm.lifetime.end.p0(
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// CHECK: call void @llvm.lifetime.end.p0(
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// CHECK: ret ptr [[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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