1b1c8d83d3
Turning on `enable_noundef_analysis` flag allows better codegen by removing freeze instructions. I modified clang by renaming `enable_noundef_analysis` flag to `disable-noundef-analysis` and turning it off by default. Test updates are made as a separate patch: D108453 Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D105169
34 lines
1.7 KiB
C++
34 lines
1.7 KiB
C++
// RUN: %clang_cc1 %s -triple=x86_64-pc-linux -emit-llvm -o - | FileCheck --check-prefix=X86 %s
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// RUN: %clang_cc1 %s -triple=wasm32 -emit-llvm -o - | FileCheck --check-prefix=WASM %s
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// RUN: %clang_cc1 %s -triple=armv7-apple-darwin9 -emit-llvm -o - | FileCheck --check-prefix=ARM %s
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// Test that destructors are not passed directly to __cxa_atexit when their
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// signatures do not match the type of its first argument.
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// e.g. ARM and WebAssembly have destructors that return this instead of void.
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class Foo {
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public:
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~Foo() {
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}
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};
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Foo global;
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// X86 destructors have void return, and are registered directly with __cxa_atexit.
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// X86: define internal void @__cxx_global_var_init()
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// X86: call i32 @__cxa_atexit(void (i8*)* bitcast (void (%class.Foo*)* @_ZN3FooD1Ev to void (i8*)*), i8* getelementptr inbounds (%class.Foo, %class.Foo* @global, i32 0, i32 0), i8* @__dso_handle)
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// ARM destructors return this, but can be registered directly with __cxa_atexit
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// because the calling conventions tolerate the mismatch.
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// ARM: define internal void @__cxx_global_var_init()
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// ARM: call i32 @__cxa_atexit(void (i8*)* bitcast (%class.Foo* (%class.Foo*)* @_ZN3FooD1Ev to void (i8*)*), i8* getelementptr inbounds (%class.Foo, %class.Foo* @global, i32 0, i32 0), i8* @__dso_handle)
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// Wasm destructors return this, and use a wrapper function, which is registered
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// with __cxa_atexit.
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// WASM: define internal void @__cxx_global_var_init()
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// WASM: call i32 @__cxa_atexit(void (i8*)* @__cxx_global_array_dtor, i8* null, i8* @__dso_handle)
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// WASM: define internal void @__cxx_global_array_dtor(i8* noundef %0)
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// WASM: %call = call noundef %class.Foo* @_ZN3FooD1Ev(%class.Foo* {{[^,]*}} @global)
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