a5fa246435
Add support for `__builtin_stack_address` builtin. The semantics match those of GCC's builtin with the same name. `__builtin_stack_address` returns the starting address of the stack region that may be used by called functions. It may or may not include the space used for on-stack arguments passed to a callee (See [GCC Bug/121013](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121013)). Fixes #82632.
23 lines
580 B
C++
23 lines
580 B
C++
// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -o - | llvm-cxxfilt | FileCheck %s
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struct S {
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void *a();
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};
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// CHECK-LABEL: @S::a()
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// CHECK: call ptr @llvm.stackaddress.p0()
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void *S::a() {
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return __builtin_stack_address();
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}
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// CHECK-LABEL: define {{[^@]+}} @two()
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// CHECK: call {{[^@]+}} @"two()::$_0::operator()() const"
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//
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// CHECK-LABEL: define {{[^@]+}} @"two()::$_0::operator()() const"
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// CHECK: [[PTR:%.*]] = call ptr @llvm.stackaddress.p0()
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// CHECK: ret ptr [[PTR]]
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void *two() {
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auto l = []() { return __builtin_stack_address(); };
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return l();
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}
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