e0ac46e69d
This reverts commit d618f1c3b12effd0c2bdb7d02108d3551f389d3d. This commit wasn't reviewed ahead of time and significant concerns were raised immediately after it landed. According to our developer policy this warrants immediate revert of the commit. https://llvm.org/docs/DeveloperPolicy.html#patch-reversion-policy Differential Revision: https://reviews.llvm.org/D155509
269 lines
7.1 KiB
C++
269 lines
7.1 KiB
C++
// RUN: %clang_cc1 -Wno-unused-value -triple i686-linux-gnu -emit-llvm -o - %s | FileCheck %s
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// rdar: //8540501
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extern "C" int printf(...);
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extern "C" void abort();
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struct A
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{
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int i;
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A (int j) : i(j) {printf("this = %p A(%d)\n", this, j);}
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A (const A &j) : i(j.i) {printf("this = %p const A&(%d)\n", this, i);}
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A& operator= (const A &j) { i = j.i; abort(); return *this; }
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~A() { printf("this = %p ~A(%d)\n", this, i); }
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};
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struct B
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{
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int i;
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B (const A& a) { i = a.i; }
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B() {printf("this = %p B()\n", this);}
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B (const B &j) : i(j.i) {printf("this = %p const B&(%d)\n", this, i);}
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~B() { printf("this = %p ~B(%d)\n", this, i); }
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};
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A foo(int j)
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{
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return ({ j ? A(1) : A(0); });
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}
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void foo2()
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{
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A b = ({ A a(1); A a1(2); A a2(3); a1; a2; a; });
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if (b.i != 1)
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abort();
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A c = ({ A a(1); A a1(2); A a2(3); a1; a2; a; A a3(4); a2; a3; });
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if (c.i != 4)
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abort();
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}
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void foo3()
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{
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const A &b = ({ A a(1); a; });
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if (b.i != 1)
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abort();
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}
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void foo4()
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{
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// CHECK: call {{.*}} @_ZN1AC1Ei
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// CHECK: call {{.*}} @_ZN1AC1ERKS_
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// CHECK: call {{.*}} @_ZN1AD1Ev
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// CHECK: call {{.*}} @_ZN1BC1ERK1A
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// CHECK: call {{.*}} @_ZN1AD1Ev
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const B &b = ({ A a(1); a; });
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if (b.i != 1)
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abort();
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}
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int main()
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{
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foo2();
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foo3();
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foo4();
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return foo(1).i-1;
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}
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// rdar: // 8600553
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int a[128];
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int* foo5() {
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// CHECK-NOT: memcpy
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// Check that array-to-pointer conversion occurs in a
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// statement-expression.
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return (({ a; }));
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}
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// <rdar://problem/14074868>
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// Make sure this doesn't crash.
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int foo5(bool b) {
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int y = 0;
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y = ({ A a(1); if (b) goto G; a.i; });
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G: return y;
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}
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// When we emit a full expression with cleanups that contains branches out of
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// the full expression, the result of the inner expression (the call to
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// call_with_cleanups in this case) may not dominate the fallthrough destination
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// of the shared cleanup block.
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//
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// In this case the CFG will be a sequence of two diamonds, but the only
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// dynamically possible execution paths are both left hand branches and both
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// right hand branches. The first diamond LHS will call bar, and the second
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// diamond LHS will assign the result to v, but the call to bar does not
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// dominate the assignment.
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int bar(A, int);
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extern "C" int cleanup_exit_scalar(bool b) {
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int v = bar(A(1), ({ if (b) return 42; 13; }));
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return v;
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}
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// CHECK-LABEL: define{{.*}} i32 @cleanup_exit_scalar({{.*}})
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// CHECK: call {{.*}} @_ZN1AC1Ei
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// Spill after bar.
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// CHECK: %[[v:[^ ]*]] = call{{.*}} i32 @_Z3bar1Ai({{.*}})
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// CHECK-NEXT: store i32 %[[v]], ptr %[[tmp:[^, ]*]]
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// Do cleanup.
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// CHECK: call {{.*}} @_ZN1AD1Ev
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// CHECK: switch
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// Reload before v assignment.
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// CHECK: %[[v:[^ ]*]] = load i32, ptr %[[tmp]]
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// CHECK-NEXT: store i32 %[[v]], ptr %v
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// No need to spill when the expression result is a constant, constants don't
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// have dominance problems.
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extern "C" int cleanup_exit_scalar_constant(bool b) {
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int v = (A(1), (void)({ if (b) return 42; 0; }), 13);
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return v;
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}
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// CHECK-LABEL: define{{.*}} i32 @cleanup_exit_scalar_constant({{.*}})
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// CHECK: store i32 13, ptr %v
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// Check for the same bug for lvalue expression evaluation kind.
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// FIXME: What about non-reference lvalues, like bitfield lvalues and vector
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// lvalues?
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int &getref();
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extern "C" int cleanup_exit_lvalue(bool cond) {
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int &r = (A(1), ({ if (cond) return 0; (void)0; }), getref());
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return r;
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}
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// CHECK-LABEL: define{{.*}} i32 @cleanup_exit_lvalue({{.*}})
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// CHECK: call {{.*}} @_ZN1AC1Ei
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// Spill after bar.
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// CHECK: %[[v:[^ ]*]] = call noundef nonnull align 4 dereferenceable(4) ptr @_Z6getrefv({{.*}})
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// CHECK-NEXT: store ptr %[[v]], ptr %[[tmp:[^, ]*]]
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// Do cleanup.
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// CHECK: call {{.*}} @_ZN1AD1Ev
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// CHECK: switch
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// Reload before v assignment.
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// CHECK: %[[v:[^ ]*]] = load ptr, ptr %[[tmp]]
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// CHECK-NEXT: store ptr %[[v]], ptr %r
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// Bind the reference to a byval argument. It is not an instruction or Constant,
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// so it's a bit of a corner case.
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struct ByVal { int x[3]; };
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extern "C" int cleanup_exit_lvalue_byval(bool cond, ByVal arg) {
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ByVal &r = (A(1), ({ if (cond) return 0; (void)ByVal(); }), arg);
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return r.x[0];
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}
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// CHECK-LABEL: define{{.*}} i32 @cleanup_exit_lvalue_byval({{.*}}, ptr noundef byval(%struct.ByVal) align 4 %arg)
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// CHECK: call {{.*}} @_ZN1AC1Ei
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// CHECK: call {{.*}} @_ZN1AD1Ev
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// CHECK: switch
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// CHECK: store ptr %arg, ptr %r
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// Bind the reference to a local variable. We don't need to spill it. Binding a
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// reference to it doesn't generate any instructions.
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extern "C" int cleanup_exit_lvalue_local(bool cond) {
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int local = 42;
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int &r = (A(1), ({ if (cond) return 0; (void)0; }), local);
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return r;
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}
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// CHECK-LABEL: define{{.*}} i32 @cleanup_exit_lvalue_local({{.*}})
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// CHECK: %local = alloca i32
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// CHECK: store i32 42, ptr %local
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// CHECK: call {{.*}} @_ZN1AC1Ei
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// CHECK-NOT: store ptr %local
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// CHECK: call {{.*}} @_ZN1AD1Ev
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// CHECK: switch
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// CHECK: store ptr %local, ptr %r, align 4
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// We handle ExprWithCleanups for complex evaluation type separately, and it had
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// the same bug.
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_Complex float bar_complex(A, int);
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extern "C" int cleanup_exit_complex(bool b) {
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_Complex float v = bar_complex(A(1), ({ if (b) return 42; 13; }));
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return (float)v;
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}
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// CHECK-LABEL: define{{.*}} i32 @cleanup_exit_complex({{.*}})
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// CHECK: call {{.*}} @_ZN1AC1Ei
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// Spill after bar.
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// CHECK: call {{.*}} @_Z11bar_complex1Ai({{.*}})
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// CHECK: store float %{{.*}}, ptr %[[tmp1:[^, ]*]]
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// CHECK: store float %{{.*}}, ptr %[[tmp2:[^, ]*]]
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// Do cleanup.
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// CHECK: call {{.*}} @_ZN1AD1Ev
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// CHECK: switch
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// Reload before v assignment.
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// CHECK: %[[v1:[^ ]*]] = load float, ptr %[[tmp1]]
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// CHECK: %[[v2:[^ ]*]] = load float, ptr %[[tmp2]]
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// CHECK: store float %[[v1]], ptr %v.realp
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// CHECK: store float %[[v2]], ptr %v.imagp
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extern "C" void then(int);
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// CHECK-LABEL: @{{.*}}volatile_load
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void volatile_load() {
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volatile int n;
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({n;});
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// CHECK-LABEL: @then(i32 noundef 1)
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then(1);
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({goto lab; lab: n;});
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// CHECK-LABEL: @then(i32 noundef 2)
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then(2);
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({[[gsl::suppress("foo")]] n;});
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// CHECK-LABEL: @then(i32 noundef 3)
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then(3);
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({if (true) n;});
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// CHECK: }
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}
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// CHECK-LABEL: @{{.*}}volatile_load_template
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template<typename T>
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void volatile_load_template() {
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volatile T n;
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({n;});
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// CHECK-LABEL: @then(i32 noundef 1)
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then(1);
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({goto lab; lab: n;});
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// CHECK-LABEL: @then(i32 noundef 2)
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then(2);
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({[[gsl::suppress("foo")]] n;});
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// CHECK-LABEL: @then(i32 noundef 3)
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then(3);
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// CHECK-NOT: load volatile
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// CHECK: load volatile
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// CHECK-NOT: load volatile
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({if (true) n;});
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// CHECK: }
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}
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template void volatile_load_template<int>();
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