956b47b486
Empty structs are ignored for parameter passing purposes, but va_arg was incrementing the pointer anyway for that the size of empty struct in c++ is 1 byte, which could lead to va_list getting out of sync. Fix #86057.
22 lines
848 B
C++
22 lines
848 B
C++
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
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// RUN: %clang_cc1 -triple i386-linux-gnu -emit-llvm -o - %s | FileCheck %s
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typedef struct {} empty;
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// CHECK-LABEL: @_Z17empty_record_testiz(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[RESULT_PTR:%.*]] = alloca ptr, align 4
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// CHECK-NEXT: [[Z_ADDR:%.*]] = alloca i32, align 4
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// CHECK-NEXT: [[LIST:%.*]] = alloca ptr, align 4
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// CHECK-NEXT: [[TMP:%.*]] = alloca [[STRUCT_EMPTY:%.*]], align 1
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// CHECK-NEXT: store ptr [[AGG_RESULT:%.*]], ptr [[RESULT_PTR]], align 4
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// CHECK-NEXT: store i32 [[Z:%.*]], ptr [[Z_ADDR]], align 4
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// CHECK-NEXT: call void @llvm.va_start.p0(ptr [[LIST]])
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// CHECK-NEXT: ret void
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//
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empty empty_record_test(int z, ...) {
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__builtin_va_list list;
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__builtin_va_start(list, z);
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return __builtin_va_arg(list, empty);
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}
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