68ab7fe1c8
alignment on Darwin.
Itanium C++ ABI specifies that _Unwind_Exception should be double-word
aligned (16B). To conform to the ABI, libraries implementing exception
handling declare the struct with __attribute__((aligned)), which aligns
the unwindHeader field (and the end of __cxa_exception) to the default
target alignment (which is typically 16-bytes).
struct __cxa_exception {
...
// struct is declared with __attribute__((aligned)).
_Unwind_Exception unwindHeader;
};
Based on the assumption that _Unwind_Exception is declared with
__attribute__((aligned)), ItaniumCXXABI::getAlignmentOfExnObject returns
the target default alignment for __attribute__((aligned)). It turns out
that libc++abi, which is used on Darwin, doesn't declare the struct with
the attribute and therefore doesn't guarantee that unwindHeader is
aligned to the alignment specified by the ABI, which in some cases
causes the program to crash because of unaligned memory accesses.
This commit avoids crashes due to unaligned memory accesses by having
getAlignmentOfExnObject return an 8-byte alignment on Darwin. I've only
fixed the problem for Darwin, but we should also figure out whether other
platforms using libc++abi need similar fixes.
rdar://problem/25314277
Differential revision: http://reviews.llvm.org/D18479
llvm-svn: 264998
475 lines
14 KiB
C++
475 lines
14 KiB
C++
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -triple x86_64-apple-darwin -std=c++11 -emit-llvm %s -o %t.ll
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// RUN: FileCheck --input-file=%t.ll %s
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struct test1_D {
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double d;
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} d1;
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void test1() {
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throw d1;
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}
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// CHECK-LABEL: define void @_Z5test1v()
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// CHECK: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
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// CHECK-NEXT: [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
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// CHECK-NEXT: [[EXN2:%.*]] = bitcast [[DSTAR]] [[EXN]] to i8*
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// CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[EXN2]], i8* bitcast ([[DSTAR]] @d1 to i8*), i64 8, i32 8, i1 false)
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// CHECK-NEXT: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({ i8*, i8* }* @_ZTI7test1_D to i8*), i8* null) [[NR:#[0-9]+]]
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// CHECK-NEXT: unreachable
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struct test2_D {
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test2_D(const test2_D&o);
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test2_D();
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virtual void bar() { }
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int i; int j;
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} d2;
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void test2() {
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throw d2;
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}
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// CHECK-LABEL: define void @_Z5test2v()
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// CHECK: [[EXNVAR:%.*]] = alloca i8*
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// CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
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// CHECK-NEXT: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 16)
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// CHECK-NEXT: [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
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// CHECK-NEXT: invoke void @_ZN7test2_DC1ERKS_([[DSTAR]] [[EXN]], [[DSTAR]] dereferenceable({{[0-9]+}}) @d2)
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// CHECK-NEXT: to label %[[CONT:.*]] unwind label %{{.*}}
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// : [[CONT]]: (can't check this in Release-Asserts builds)
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// CHECK: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({{.*}}* @_ZTI7test2_D to i8*), i8* null) [[NR]]
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// CHECK-NEXT: unreachable
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struct test3_D {
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test3_D() { }
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test3_D(volatile test3_D&o);
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virtual void bar();
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};
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void test3() {
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throw (volatile test3_D *)0;
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}
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// CHECK-LABEL: define void @_Z5test3v()
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// CHECK: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
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// CHECK-NEXT: [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[D:%[^*]+]]**
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// CHECK-NEXT: store [[D]]* null, [[D]]** [[EXN]]
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// CHECK-NEXT: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({ i8*, i8*, i32, i8* }* @_ZTIPV7test3_D to i8*), i8* null) [[NR]]
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// CHECK-NEXT: unreachable
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void test4() {
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throw;
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}
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// CHECK-LABEL: define void @_Z5test4v()
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// CHECK: call void @__cxa_rethrow() [[NR]]
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// CHECK-NEXT: unreachable
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// rdar://problem/7696549
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namespace test5 {
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struct A {
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A();
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A(const A&);
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~A();
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};
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void test() {
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try { throw A(); } catch (A &x) {}
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}
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// CHECK-LABEL: define void @_ZN5test54testEv()
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// CHECK: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 1)
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// CHECK: [[EXNCAST:%.*]] = bitcast i8* [[EXNOBJ]] to [[A:%[^*]*]]*
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// CHECK-NEXT: invoke void @_ZN5test51AC1Ev([[A]]* [[EXNCAST]])
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// CHECK: invoke void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({{.*}}* @_ZTIN5test51AE to i8*), i8* bitcast (void ([[A]]*)* @_ZN5test51AD1Ev to i8*)) [[NR]]
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// CHECK-NEXT: to label {{%.*}} unwind label %[[HANDLER:[^ ]*]]
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// : [[HANDLER]]: (can't check this in Release-Asserts builds)
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// CHECK: {{%.*}} = call i32 @llvm.eh.typeid.for(i8* bitcast ({{.*}}* @_ZTIN5test51AE to i8*))
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}
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namespace test6 {
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template <class T> struct allocator {
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~allocator() throw() { }
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};
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void foo() {
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allocator<int> a;
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}
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}
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// PR7127
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namespace test7 {
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// CHECK-LABEL: define i32 @_ZN5test73fooEv()
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// CHECK-SAME: personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
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int foo() {
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// CHECK: [[CAUGHTEXNVAR:%.*]] = alloca i8*
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// CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
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// CHECK-NEXT: [[INTCATCHVAR:%.*]] = alloca i32
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try {
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try {
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// CHECK-NEXT: [[EXNALLOC:%.*]] = call i8* @__cxa_allocate_exception
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// CHECK-NEXT: bitcast i8* [[EXNALLOC]] to i32*
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// CHECK-NEXT: store i32 1, i32*
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// CHECK-NEXT: invoke void @__cxa_throw(i8* [[EXNALLOC]], i8* bitcast (i8** @_ZTIi to i8*), i8* null
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throw 1;
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}
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// CHECK: [[CAUGHTVAL:%.*]] = landingpad { i8*, i32 }
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// CHECK-NEXT: catch i8* bitcast (i8** @_ZTIi to i8*)
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// CHECK-NEXT: catch i8* null
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// CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 0
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// CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
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// CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 1
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// CHECK-NEXT: store i32 [[SELECTOR]], i32* [[SELECTORVAR]]
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// CHECK-NEXT: br label
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// CHECK: [[SELECTOR:%.*]] = load i32, i32* [[SELECTORVAR]]
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// CHECK-NEXT: [[T0:%.*]] = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
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// CHECK-NEXT: icmp eq i32 [[SELECTOR]], [[T0]]
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// CHECK-NEXT: br i1
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// CHECK: [[T0:%.*]] = load i8*, i8** [[CAUGHTEXNVAR]]
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// CHECK-NEXT: [[T1:%.*]] = call i8* @__cxa_begin_catch(i8* [[T0]])
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// CHECK-NEXT: [[T2:%.*]] = bitcast i8* [[T1]] to i32*
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// CHECK-NEXT: [[T3:%.*]] = load i32, i32* [[T2]]
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// CHECK-NEXT: store i32 [[T3]], i32* {{%.*}}, align 4
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// CHECK-NEXT: invoke void @__cxa_rethrow
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catch (int) {
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throw;
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}
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}
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// CHECK: [[CAUGHTVAL:%.*]] = landingpad { i8*, i32 }
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// CHECK-NEXT: catch i8* null
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// CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 0
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// CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
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// CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 1
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// CHECK-NEXT: store i32 [[SELECTOR]], i32* [[SELECTORVAR]]
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// CHECK-NEXT: call void @__cxa_end_catch()
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// CHECK-NEXT: br label
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// CHECK: load i8*, i8** [[CAUGHTEXNVAR]]
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// CHECK-NEXT: call i8* @__cxa_begin_catch
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// CHECK-NEXT: call void @__cxa_end_catch
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catch (...) {
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}
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// CHECK: ret i32 0
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return 0;
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}
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}
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// Ordering of destructors in a catch handler.
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namespace test8 {
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struct A { A(const A&); ~A(); };
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void bar();
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// CHECK-LABEL: define void @_ZN5test83fooEv()
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void foo() {
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try {
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// CHECK: invoke void @_ZN5test83barEv()
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bar();
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} catch (A a) {
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// CHECK: call i8* @__cxa_get_exception_ptr
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// CHECK-NEXT: bitcast
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// CHECK-NEXT: invoke void @_ZN5test81AC1ERKS0_(
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// CHECK: call i8* @__cxa_begin_catch
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// CHECK-NEXT: call void @_ZN5test81AD1Ev(
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// CHECK: call void @__cxa_end_catch()
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// CHECK: ret void
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}
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}
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}
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// Constructor function-try-block must rethrow on fallthrough.
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// rdar://problem/7696603
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namespace test9 {
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void opaque();
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struct A { A(); };
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// CHECK-LABEL: define void @_ZN5test91AC2Ev(%"struct.test9::A"* %this) unnamed_addr
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// CHECK-SAME: personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
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A::A() try {
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// CHECK: invoke void @_ZN5test96opaqueEv()
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opaque();
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} catch (int x) {
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// CHECK: landingpad { i8*, i32 }
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// CHECK-NEXT: catch i8* bitcast (i8** @_ZTIi to i8*)
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// CHECK: call i8* @__cxa_begin_catch
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// CHECK: invoke void @_ZN5test96opaqueEv()
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// CHECK: invoke void @__cxa_rethrow()
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// CHECK-LABEL: define void @_ZN5test91AC1Ev(%"struct.test9::A"* %this) unnamed_addr
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// CHECK: call void @_ZN5test91AC2Ev
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// CHECK-NEXT: ret void
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opaque();
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}
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}
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// __cxa_end_catch can throw for some kinds of caught exceptions.
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namespace test10 {
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void opaque();
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struct A { ~A(); };
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struct B { int x; };
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// CHECK-LABEL: define void @_ZN6test103fooEv()
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void foo() {
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A a; // force a cleanup context
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try {
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// CHECK: invoke void @_ZN6test106opaqueEv()
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opaque();
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} catch (int i) {
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// CHECK: call i8* @__cxa_begin_catch
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// CHECK-NEXT: bitcast
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// CHECK-NEXT: load i32, i32*
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// CHECK-NEXT: store i32
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// CHECK-NEXT: call void @__cxa_end_catch() [[NUW:#[0-9]+]]
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} catch (B a) {
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// CHECK: call i8* @__cxa_begin_catch
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// CHECK-NEXT: bitcast
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// CHECK-NEXT: bitcast
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// CHECK-NEXT: bitcast
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// CHECK-NEXT: call void @llvm.memcpy
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// CHECK-NEXT: invoke void @__cxa_end_catch()
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} catch (...) {
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// CHECK: call i8* @__cxa_begin_catch
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// CHECK-NEXT: invoke void @__cxa_end_catch()
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}
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// CHECK: call void @_ZN6test101AD1Ev(
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}
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}
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// __cxa_begin_catch returns pointers by value, even when catching by reference
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// <rdar://problem/8212123>
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namespace test11 {
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void opaque();
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// CHECK-LABEL: define void @_ZN6test113fooEv()
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void foo() {
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try {
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// CHECK: invoke void @_ZN6test116opaqueEv()
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opaque();
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} catch (int**&p) {
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// CHECK: [[EXN:%.*]] = load i8*, i8**
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// CHECK-NEXT: call i8* @__cxa_begin_catch(i8* [[EXN]]) [[NUW]]
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// CHECK-NEXT: [[ADJ1:%.*]] = getelementptr i8, i8* [[EXN]], i32 32
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// CHECK-NEXT: [[ADJ2:%.*]] = bitcast i8* [[ADJ1]] to i32***
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// CHECK-NEXT: store i32*** [[ADJ2]], i32**** [[P:%.*]]
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// CHECK-NEXT: call void @__cxa_end_catch() [[NUW]]
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}
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}
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struct A {};
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// CHECK-LABEL: define void @_ZN6test113barEv()
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void bar() {
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try {
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// CHECK: [[EXNSLOT:%.*]] = alloca i8*
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// CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
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// CHECK-NEXT: [[P:%.*]] = alloca [[A:%.*]]**,
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// CHECK-NEXT: [[TMP:%.*]] = alloca [[A]]*
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// CHECK-NEXT: invoke void @_ZN6test116opaqueEv()
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opaque();
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} catch (A*&p) {
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// CHECK: [[EXN:%.*]] = load i8*, i8** [[EXNSLOT]]
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// CHECK-NEXT: [[ADJ1:%.*]] = call i8* @__cxa_begin_catch(i8* [[EXN]]) [[NUW]]
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// CHECK-NEXT: [[ADJ2:%.*]] = bitcast i8* [[ADJ1]] to [[A]]*
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// CHECK-NEXT: store [[A]]* [[ADJ2]], [[A]]** [[TMP]]
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// CHECK-NEXT: store [[A]]** [[TMP]], [[A]]*** [[P]]
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// CHECK-NEXT: call void @__cxa_end_catch() [[NUW]]
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}
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}
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}
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// PR7686
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namespace test12 {
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struct A { ~A() noexcept(false); };
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bool opaque(const A&);
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// CHECK-LABEL: define void @_ZN6test124testEv()
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void test() {
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// CHECK: [[X:%.*]] = alloca [[A:%.*]],
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// CHECK: [[EHCLEANUPDEST:%.*]] = alloca i32
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// CHECK: [[Y:%.*]] = alloca [[A]]
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// CHECK: [[Z:%.*]] = alloca [[A]]
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// CHECK: [[CLEANUPDEST:%.*]] = alloca i32
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A x;
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// CHECK: invoke zeroext i1 @_ZN6test126opaqueERKNS_1AE(
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if (opaque(x)) {
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A y;
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A z;
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// CHECK: invoke void @_ZN6test121AD1Ev([[A]]* [[Z]])
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// CHECK: invoke void @_ZN6test121AD1Ev([[A]]* [[Y]])
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// CHECK-NOT: switch
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goto success;
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}
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success:
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bool _ = true;
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// CHECK: call void @_ZN6test121AD1Ev([[A]]* [[X]])
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// CHECK-NEXT: ret void
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}
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}
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// Reduced from some TableGen code that was causing a self-host crash.
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namespace test13 {
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struct A { ~A(); };
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void test0(int x) {
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try {
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switch (x) {
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case 0:
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break;
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case 1:{
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A a;
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break;
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}
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default:
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return;
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}
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return;
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} catch (int x) {
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}
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return;
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}
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void test1(int x) {
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A y;
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try {
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switch (x) {
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default: break;
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}
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} catch (int x) {}
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}
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}
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// rdar://problem/8231514
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namespace test14 {
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struct A { ~A(); };
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struct B { ~B(); };
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B b();
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void opaque();
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void foo() {
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A a;
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try {
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B str = b();
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opaque();
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} catch (int x) {
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}
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}
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}
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// rdar://problem/8231514
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// JumpDests shouldn't get confused by scopes that aren't normal cleanups.
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namespace test15 {
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struct A { ~A(); };
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bool opaque(int);
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// CHECK-LABEL: define void @_ZN6test153fooEv()
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void foo() {
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A a;
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try {
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// CHECK: [[X:%.*]] = alloca i32
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// CHECK: store i32 10, i32* [[X]]
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// CHECK-NEXT: br label
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// -> while.cond
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int x = 10;
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while (true) {
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// CHECK: load i32, i32* [[X]]
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// CHECK-NEXT: [[COND:%.*]] = invoke zeroext i1 @_ZN6test156opaqueEi
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// CHECK: br i1 [[COND]]
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if (opaque(x))
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// CHECK: br label
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break;
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// CHECK: br label
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}
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// CHECK: br label
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} catch (int x) { }
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// CHECK: call void @_ZN6test151AD1Ev
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}
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}
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namespace test16 {
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struct A { A(); ~A() noexcept(false); };
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struct B { int x; B(const A &); ~B() noexcept(false); };
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void foo();
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bool cond();
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// CHECK-LABEL: define void @_ZN6test163barEv()
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void bar() {
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// CHECK: [[EXN_SAVE:%.*]] = alloca i8*
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// CHECK-NEXT: [[EXN_ACTIVE:%.*]] = alloca i1
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// CHECK-NEXT: [[TEMP:%.*]] = alloca [[A:%.*]],
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// CHECK-NEXT: [[EXNSLOT:%.*]] = alloca i8*
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// CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
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// CHECK-NEXT: [[TEMP_ACTIVE:%.*]] = alloca i1
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cond() ? throw B(A()) : foo();
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// CHECK-NEXT: [[COND:%.*]] = call zeroext i1 @_ZN6test164condEv()
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// CHECK-NEXT: store i1 false, i1* [[EXN_ACTIVE]]
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// CHECK-NEXT: store i1 false, i1* [[TEMP_ACTIVE]]
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// CHECK-NEXT: br i1 [[COND]],
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// CHECK: [[EXN:%.*]] = call i8* @__cxa_allocate_exception(i64 4)
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// CHECK-NEXT: store i8* [[EXN]], i8** [[EXN_SAVE]]
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// CHECK-NEXT: store i1 true, i1* [[EXN_ACTIVE]]
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// CHECK-NEXT: [[T0:%.*]] = bitcast i8* [[EXN]] to [[B:%.*]]*
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// CHECK-NEXT: invoke void @_ZN6test161AC1Ev([[A]]* [[TEMP]])
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// CHECK: store i1 true, i1* [[TEMP_ACTIVE]]
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// CHECK-NEXT: invoke void @_ZN6test161BC1ERKNS_1AE([[B]]* [[T0]], [[A]]* dereferenceable({{[0-9]+}}) [[TEMP]])
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// CHECK: store i1 false, i1* [[EXN_ACTIVE]]
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// CHECK-NEXT: invoke void @__cxa_throw(i8* [[EXN]],
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// CHECK: invoke void @_ZN6test163fooEv()
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// CHECK: br label
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// CHECK: invoke void @_ZN6test161AD1Ev([[A]]* [[TEMP]])
|
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// CHECK: ret void
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// CHECK: [[T0:%.*]] = load i1, i1* [[EXN_ACTIVE]]
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// CHECK-NEXT: br i1 [[T0]]
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// CHECK: [[T1:%.*]] = load i8*, i8** [[EXN_SAVE]]
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// CHECK-NEXT: call void @__cxa_free_exception(i8* [[T1]])
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|
// CHECK-NEXT: br label
|
|
}
|
|
}
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|
|
namespace test17 {
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|
class BaseException {
|
|
private:
|
|
int a[4];
|
|
public:
|
|
BaseException() {};
|
|
};
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|
|
|
class DerivedException: public BaseException {
|
|
};
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|
|
|
int foo() {
|
|
throw DerivedException();
|
|
// The alignment passed to memset is 8, not 16, on Darwin.
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|
|
|
// CHECK: [[T0:%.*]] = call i8* @__cxa_allocate_exception(i64 16)
|
|
// CHECK-NEXT: [[T1:%.*]] = bitcast i8* [[T0]] to %"class.test17::DerivedException"*
|
|
// CHECK-NEXT: [[T2:%.*]] = bitcast %"class.test17::DerivedException"* [[T1]] to i8*
|
|
// CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[T2]], i8 0, i64 16, i32 8, i1 false)
|
|
}
|
|
}
|
|
|
|
// CHECK: attributes [[NUW]] = { nounwind }
|
|
// CHECK: attributes [[NR]] = { noreturn }
|