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84c4754372
This implements the flag proposed in RFC http://lists.llvm.org/pipermail/cfe-dev/2020-August/066437.html. The goal is to add a way to override the default target C++ ABI through a compiler flag. This makes it easier to test and transition between different C++ ABIs through compile flags rather than build flags. In this patch: - Store -fc++-abi= in a LangOpt. This isn't stored in a CodeGenOpt because there are instances outside of codegen where Clang needs to know what the ABI is (particularly through ASTContext::createCXXABI), and we should be able to override the target default if the flag is provided at that point. - Expose the existing ABIs in TargetCXXABI as values that can be passed through this flag. - Create a .def file for these ABIs to make it easier to check flag values. - Add an error for diagnosing bad ABI flag values. Differential Revision: https://reviews.llvm.org/D85802
29 lines
894 B
C++
29 lines
894 B
C++
// Assert that the ABI switch uses the proper codegen. Fuchsia uses the
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// "return this" ABI on constructors and destructors by default, but if we
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// explicitly choose the generic itanium C++ ABI, we should not return "this" on
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// ctors/dtors.
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//
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// RUN: %clang_cc1 %s -emit-llvm -o - -triple=x86_64-unknown-fuchsia -fc++-abi=itanium | FileCheck %s
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// RUN: %clang_cc1 %s -emit-llvm -o - -triple=aarch64-unknown-fuchsia -fc++-abi=itanium | FileCheck %s
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class A {
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public:
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virtual ~A();
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int x_;
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};
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class B : public A {
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public:
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B(int *i);
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virtual ~B();
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int *i_;
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};
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B::B(int *i) : i_(i) {}
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B::~B() {}
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// CHECK: define{{.*}} void @_ZN1BC2EPi(%class.B* {{[^,]*}} %this, i32* %i)
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// CHECK: define{{.*}} void @_ZN1BC1EPi(%class.B* {{[^,]*}} %this, i32* %i)
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// CHECK: define{{.*}} void @_ZN1BD2Ev(%class.B* {{[^,]*}} %this)
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// CHECK: define{{.*}} void @_ZN1BD1Ev(%class.B* {{[^,]*}} %this)
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