forked from OSchip/llvm-project
38 lines
1.6 KiB
C++
38 lines
1.6 KiB
C++
// ByVal attributes should propogate through to produce proper assembly and
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// avoid "unpacking" structs within the stubs on x86_64.
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// RUN: %clang_cc1 %s -triple=x86_64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
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struct LargeStruct {
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char x[24];
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virtual ~LargeStruct() {}
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};
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struct fidl_string {
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unsigned long long size;
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char *data;
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};
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static_assert(sizeof(fidl_string) == 16, "");
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class Base {
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public:
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virtual void func(LargeStruct, fidl_string, LargeStruct, fidl_string) = 0;
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};
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class Derived : public Base {
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public:
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void func(LargeStruct, fidl_string, LargeStruct, fidl_string) override;
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};
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// The original function takes a byval pointer.
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// CHECK: define void @_ZN7Derived4funcE11LargeStruct11fidl_stringS0_S1_(%class.Derived* %this, %struct.LargeStruct* %ls, i64 %sv1.coerce0, i8* %sv1.coerce1, %struct.LargeStruct* %ls2, %struct.fidl_string* byval(%struct.fidl_string) align 8 %sv2) unnamed_addr
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// So the stub should take and pass one also.
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// CHECK: define hidden void @_ZN7Derived4funcE11LargeStruct11fidl_stringS0_S1_.stub(%class.Derived* %0, %struct.LargeStruct* %1, i64 %2, i8* %3, %struct.LargeStruct* %4, %struct.fidl_string* byval(%struct.fidl_string) align 8 %5) unnamed_addr {{#[0-9]+}} comdat
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// CHECK-NEXT: entry:
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// CHECK-NEXT: tail call void @_ZN7Derived4funcE11LargeStruct11fidl_stringS0_S1_(%class.Derived* %0, %struct.LargeStruct* %1, i64 %2, i8* %3, %struct.LargeStruct* %4, %struct.fidl_string* byval(%struct.fidl_string) align 8 %5)
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// CHECK-NEXT: ret void
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// CHECK-NEXT: }
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void Derived::func(LargeStruct ls, fidl_string sv1, LargeStruct ls2, fidl_string sv2) {}
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