d8cbeec178
While we can't yet emit vbtables, this allows us to find virtual bases of objects constructed in other TUs. This make iostream hello world work, since basic_ostream virtually inherits from basic_ios. Differential Revision: http://llvm-reviews.chandlerc.com/D795 llvm-svn: 182870
90 lines
3.7 KiB
C++
90 lines
3.7 KiB
C++
// RUN: %clang_cc1 -emit-llvm %s -o - -triple i686-pc-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -cxx-abi microsoft -emit-llvm %s -o - -triple i686-pc-win32 | FileCheck -check-prefix MSVC %s
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struct A { int a; virtual int aa(); };
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struct B { int b; virtual int bb(); };
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struct C : virtual A, virtual B { int c; virtual int aa(); virtual int bb(); };
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struct AA { int a; virtual int aa(); };
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struct BB { int b; virtual int bb(); };
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struct CC : AA, BB { virtual int aa(); virtual int bb(); virtual int cc(); };
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struct D : virtual C, virtual CC { int e; };
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D* x;
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A* a() { return x; }
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// CHECK: @_Z1av() [[NUW:#[0-9]+]]
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// CHECK: [[VBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = getelementptr i8* {{.*}}, i64 -16
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// CHECK: [[CASTVBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRA]] to i32*
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// CHECK: load i32* [[CASTVBASEOFFSETPTRA]]
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// CHECK: }
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// MSVC: @"\01?a@@YAPAUA@@XZ"() [[NUW:#[0-9]+]] {
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// MSVC: %[[vbptr_off:.*]] = getelementptr inbounds i8* {{.*}}, i32 0
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// MSVC: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i8**
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// MSVC: %[[vbtable:.*]] = load i8** %[[vbptr]]
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// MSVC: %[[entry:.*]] = getelementptr inbounds i8* {{.*}}, i32 4
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// MSVC: %[[entry_i32:.*]] = bitcast i8* %[[entry]] to i32*
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// MSVC: %[[offset:.*]] = load i32* %[[entry_i32]]
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// MSVC: add nsw i32 0, %[[offset]]
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// MSVC: }
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B* b() { return x; }
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// CHECK: @_Z1bv() [[NUW]]
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// CHECK: [[VBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = getelementptr i8* {{.*}}, i64 -20
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// CHECK: [[CASTVBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRA]] to i32*
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// CHECK: load i32* [[CASTVBASEOFFSETPTRA]]
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// CHECK: }
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// Same as 'a' except we use a different vbtable offset.
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// MSVC: @"\01?b@@YAPAUB@@XZ"() [[NUW:#[0-9]+]] {
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// MSVC: %[[vbptr_off:.*]] = getelementptr inbounds i8* {{.*}}, i32 0
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// MSVC: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i8**
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// MSVC: %[[vbtable:.*]] = load i8** %[[vbptr]]
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// MSVC: %[[entry:.*]] = getelementptr inbounds i8* {{.*}}, i32 8
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// MSVC: %[[entry_i32:.*]] = bitcast i8* %[[entry]] to i32*
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// MSVC: %[[offset:.*]] = load i32* %[[entry_i32]]
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// MSVC: add nsw i32 0, %[[offset]]
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// MSVC: }
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BB* c() { return x; }
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// CHECK: @_Z1cv() [[NUW]]
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// CHECK: [[VBASEOFFSETPTRC:%[a-zA-Z0-9\.]+]] = getelementptr i8* {{.*}}, i64 -24
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// CHECK: [[CASTVBASEOFFSETPTRC:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRC]] to i32*
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// CHECK: [[VBASEOFFSETC:%[a-zA-Z0-9\.]+]] = load i32* [[CASTVBASEOFFSETPTRC]]
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// CHECK: add i32 [[VBASEOFFSETC]], 8
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// CHECK: }
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// Same as 'a' except we use a different vbtable offset.
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// MSVC: @"\01?c@@YAPAUBB@@XZ"() [[NUW:#[0-9]+]] {
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// MSVC: %[[vbptr_off:.*]] = getelementptr inbounds i8* {{.*}}, i32 0
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// MSVC: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i8**
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// MSVC: %[[vbtable:.*]] = load i8** %[[vbptr]]
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// MSVC: %[[entry:.*]] = getelementptr inbounds i8* {{.*}}, i32 16
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// MSVC: %[[entry_i32:.*]] = bitcast i8* %[[entry]] to i32*
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// MSVC: %[[offset:.*]] = load i32* %[[entry_i32]]
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// MSVC: add nsw i32 0, %[[offset]]
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// MSVC: }
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// Put the vbptr at a non-zero offset inside a non-virtual base.
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struct E { int e; };
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struct F : E, D { int f; };
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F* y;
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BB* d() { return y; }
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// Same as 'c' except the vbptr offset is 4, changing the initial GEP and the
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// final add.
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// MSVC: @"\01?d@@YAPAUBB@@XZ"() [[NUW:#[0-9]+]] {
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// MSVC: %[[vbptr_off:.*]] = getelementptr inbounds i8* {{.*}}, i32 4
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// MSVC: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i8**
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// MSVC: %[[vbtable:.*]] = load i8** %[[vbptr]]
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// MSVC: %[[entry:.*]] = getelementptr inbounds i8* {{.*}}, i32 16
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// MSVC: %[[entry_i32:.*]] = bitcast i8* %[[entry]] to i32*
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// MSVC: %[[offset:.*]] = load i32* %[[entry_i32]]
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// MSVC: add nsw i32 4, %[[offset]]
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// MSVC: }
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// CHECK: attributes [[NUW]] = { nounwind{{.*}} }
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