ce44fe199b
Check applied to unbounded (incomplete) arrays and pointers to spot cases where the computed address is beyond the largest possible addressable extent of the array, based on the address space in which the array is delcared, or which the pointer refers to. Check helps to avoid cases of nonsense pointer math and array indexing which could lead to linker failures or runtime exceptions. Of particular interest when building for embedded systems with small address spaces. This is version 2 of this patch -- version 1 had some testing issues due to a sign error in existing code. That error is corrected and lit test for this chagne is extended to verify the fix. Originally reviewed/accepted by: aaron.ballman Original revision: https://reviews.llvm.org/D86796 Reviewed By: aaron.ballman, ebevhan Differential Revision: https://reviews.llvm.org/D88174
155 lines
5.5 KiB
C
155 lines
5.5 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-linux %s -Wno-tautological-pointer-compare -Wno-pointer-to-int-cast
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#define EVAL_EXPR(testno, expr) enum { test##testno = (expr) }; struct check_positive##testno { int a[test##testno]; };
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int x;
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EVAL_EXPR(1, (_Bool)&x)
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EVAL_EXPR(2, (int)(1.0+(double)4))
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EVAL_EXPR(3, (int)(1.0+(float)4.0))
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EVAL_EXPR(4, (_Bool)(1 ? (void*)&x : 0))
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EVAL_EXPR(5, (_Bool)(int[]){0})
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struct y {int x,y;};
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EVAL_EXPR(6, (int)(1+(struct y*)0))
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EVAL_EXPR(7, (int)&((struct y*)0)->y)
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EVAL_EXPR(8, (_Bool)"asdf")
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EVAL_EXPR(9, !!&x)
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EVAL_EXPR(10, ((void)1, 12))
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void g0(void);
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EVAL_EXPR(11, (g0(), 12)) // expected-error {{not an integer constant expression}}
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EVAL_EXPR(12, 1.0&&2.0)
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EVAL_EXPR(13, x || 3.0) // expected-error {{not an integer constant expression}}
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unsigned int l_19 = 1;
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EVAL_EXPR(14, (1 ^ l_19) && 1); // expected-error {{not an integer constant expression}}
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void f()
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{
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int a;
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EVAL_EXPR(15, (_Bool)&a);
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}
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// FIXME: Turn into EVAL_EXPR test once we have more folding.
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_Complex float g16 = (1.0f + 1.0fi);
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// ?: in constant expressions.
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int g17[(3?:1) - 2];
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EVAL_EXPR(18, ((int)((void*)10 + 10)) == 20 ? 1 : -1);
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struct s {
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int a[(int)-1.0f]; // expected-error {{array size is negative}}
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};
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EVAL_EXPR(19, ((int)&*(char*)10 == 10 ? 1 : -1));
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EVAL_EXPR(20, __builtin_constant_p(*((int*) 10)));
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EVAL_EXPR(21, (__imag__ 2i) == 2 ? 1 : -1);
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EVAL_EXPR(22, (__real__ (2i+3)) == 3 ? 1 : -1);
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int g23[(int)(1.0 / 1.0)] = { 1 }; // expected-warning {{folded to constant array}}
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int g24[(int)(1.0 / 1.0)] = { 1 , 2 }; // expected-warning {{folded to constant array}} expected-warning {{excess elements in array initializer}}
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int g25[(int)(1.0 + 1.0)], g26 = sizeof(g25); // expected-warning {{folded to constant array}}
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EVAL_EXPR(26, (_Complex double)0 ? -1 : 1)
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EVAL_EXPR(27, (_Complex int)0 ? -1 : 1)
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EVAL_EXPR(28, (_Complex double)1 ? 1 : -1)
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EVAL_EXPR(29, (_Complex int)1 ? 1 : -1)
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// PR4027 + rdar://6808859
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struct a { int x, y; };
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static struct a V2 = (struct a)(struct a){ 1, 2};
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static const struct a V1 = (struct a){ 1, 2};
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EVAL_EXPR(30, (int)(_Complex float)((1<<30)-1) == (1<<30) ? 1 : -1)
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EVAL_EXPR(31, (int*)0 == (int*)0 ? 1 : -1)
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EVAL_EXPR(32, (int*)0 != (int*)0 ? -1 : 1)
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EVAL_EXPR(33, (void*)0 - (void*)0 == 0 ? 1 : -1)
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void foo(void) {}
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EVAL_EXPR(34, (foo == (void *)0) ? -1 : 1)
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// No PR. Mismatched bitwidths lead to a crash on second evaluation.
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const _Bool constbool = 0;
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EVAL_EXPR(35, constbool)
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EVAL_EXPR(36, constbool)
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EVAL_EXPR(37, (1,2.0) == 2.0 ? 1 : -1)
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EVAL_EXPR(38, __builtin_expect(1,1) == 1 ? 1 : -1)
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// PR7884
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EVAL_EXPR(39, __real__(1.f) == 1 ? 1 : -1)
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EVAL_EXPR(40, __imag__(1.f) == 0 ? 1 : -1)
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// From gcc testsuite
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EVAL_EXPR(41, (int)(1+(_Complex unsigned)2))
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// rdar://8875946
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void rdar8875946() {
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double _Complex P;
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float _Complex P2 = 3.3f + P;
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}
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double d = (d = 0.0); // expected-error {{not a compile-time constant}}
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double d2 = ++d; // expected-error {{not a compile-time constant}}
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int n = 2;
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int intLvalue[*(int*)((long)&n ?: 1)] = { 1, 2 }; // expected-error {{variable length array}}
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union u { int a; char b[4]; };
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char c = ((union u)(123456)).b[0]; // expected-error {{not a compile-time constant}}
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extern const int weak_int __attribute__((weak));
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const int weak_int = 42;
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int weak_int_test = weak_int; // expected-error {{not a compile-time constant}}
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int literalVsNull1 = "foo" == 0;
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int literalVsNull2 = 0 == "foo";
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// PR11385.
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int castViaInt[*(int*)(unsigned long)"test"]; // expected-error {{variable length array}}
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// PR11391.
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struct PR11391 { _Complex float f; } pr11391;
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EVAL_EXPR(42, __builtin_constant_p(pr11391.f = 1))
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// PR12043
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float varfloat;
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const float constfloat = 0;
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EVAL_EXPR(43, varfloat && constfloat) // expected-error {{not an integer constant expression}}
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// <rdar://problem/10962435>
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EVAL_EXPR(45, ((char*)-1) + 1 == 0 ? 1 : -1)
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EVAL_EXPR(46, ((char*)-1) + 1 < (char*) -1 ? 1 : -1)
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EVAL_EXPR(47, &x < &x + 1 ? 1 : -1)
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EVAL_EXPR(48, &x != &x - 1 ? 1 : -1)
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EVAL_EXPR(49, &x < &x - 100 ? 1 : -1) // expected-error {{not an integer constant expression}}
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extern struct Test50S Test50;
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EVAL_EXPR(50, &Test50 < (struct Test50S*)((unsigned long)&Test50 + 10)) // expected-error {{not an integer constant expression}}
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// <rdar://problem/11874571>
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EVAL_EXPR(51, 0 != (float)1e99)
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// PR21945
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void PR21945() { int i = (({}), 0l); }
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void PR24622();
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struct PR24622 {} pr24622;
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EVAL_EXPR(52, &pr24622 == (void *)&PR24622); // expected-error {{not an integer constant expression}}
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// We evaluate these by providing 2s' complement semantics in constant
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// expressions, like we do for integers.
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void *PR28739a = (__int128)(unsigned long)-1 + &PR28739a; // expected-warning {{the pointer incremented by 18446744073709551615 refers past the last possible element for an array in 64-bit address space containing 64-bit (8-byte) elements (max possible 2305843009213693952 elements)}}
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void *PR28739b = &PR28739b + (__int128)(unsigned long)-1; // expected-warning {{refers past the last possible element}}
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__int128 PR28739c = (&PR28739c + (__int128)(unsigned long)-1) - &PR28739c; // expected-warning {{refers past the last possible element}}
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void *PR28739d = &(&PR28739d)[(__int128)(unsigned long)-1]; // expected-warning {{refers past the last possible element}}
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struct PR35214_X {
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int k;
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int arr[];
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};
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int PR35214_x;
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int PR35214_y = ((struct PR35214_X *)&PR35214_x)->arr[1]; // expected-error {{not a compile-time constant}}
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int *PR35214_z = &((struct PR35214_X *)&PR35214_x)->arr[1]; // ok, &PR35214_x + 2
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