clang/test/Sema/asm.c

   1 // RUN: %clang_cc1 %s -Wno-private-extern -triple i386-pc-linux-gnu -verify -fsyntax-only
   2
   3 void f(void) {
   4   int i;
   5
   6   asm ("foo\n" : : "a" (i + 2));
   7   asm ("foo\n" : : "a" (f())); // expected-error {{invalid type 'void' in asm input}}
   8
   9   asm ("foo\n" : "=a" (f())); // expected-error {{invalid lvalue in asm output}}
  10   asm ("foo\n" : "=a" (i + 2)); // expected-error {{invalid lvalue in asm output}}
  11
  12   asm ("foo\n" : [symbolic_name] "=a" (i) : "[symbolic_name]" (i));
  13   asm ("foo\n" : "=a" (i) : "[" (i)); // expected-error {{invalid input constraint '[' in asm}}
  14   asm ("foo\n" : "=a" (i) : "[foo" (i)); // expected-error {{invalid input constraint '[foo' in asm}}
  15   asm ("foo\n" : "=a" (i) : "[symbolic_name]" (i)); // expected-error {{invalid input constraint '[symbolic_name]' in asm}}
  16
  17   asm ("foo\n" : : "" (i)); // expected-error {{invalid input constraint '' in asm}}
  18   asm ("foo\n" : "=a" (i) : "" (i)); // expected-error {{invalid input constraint '' in asm}}
  19 }
  20
  21 void clobbers(void) {
  22   asm ("nop" : : : "ax", "#ax", "%ax");
  23   asm ("nop" : : : "eax", "rax", "ah", "al");
  24   asm ("nop" : : : "0", "%0", "#0");
  25   asm ("nop" : : : "foo"); // expected-error {{unknown register name 'foo' in asm}}
  26   asm ("nop" : : : "52");
  27   asm ("nop" : : : "204"); // expected-error {{unknown register name '204' in asm}}
  28   asm ("nop" : : : "-1"); // expected-error {{unknown register name '-1' in asm}}
  29   asm ("nop" : : : "+1"); // expected-error {{unknown register name '+1' in asm}}
  30   register void *clobber_conflict asm ("%rcx");
  31   register void *no_clobber_conflict asm ("%rax");
  32   int a,b,c;
  33   asm ("nop" : "=r" (no_clobber_conflict) : "r" (clobber_conflict) : "%rcx"); // expected-error {{asm-specifier for input or output variable conflicts with asm clobber list}}
  34   asm ("nop" : "=r" (clobber_conflict) : "r" (no_clobber_conflict) : "%rcx"); // expected-error {{asm-specifier for input or output variable conflicts with asm clobber list}}
  35   asm ("nop" : "=r" (clobber_conflict) : "r" (clobber_conflict) : "%rcx"); // expected-error {{asm-specifier for input or output variable conflicts with asm clobber list}}
  36   asm ("nop" : "=c" (a) : "r" (no_clobber_conflict) : "%rcx"); // expected-error {{asm-specifier for input or output variable conflicts with asm clobber list}}
  37   asm ("nop" : "=r" (no_clobber_conflict) : "c" (c) : "%rcx"); // expected-error {{asm-specifier for input or output variable conflicts with asm clobber list}}
  38   asm ("nop" : "=r" (clobber_conflict) : "c" (c) : "%rcx"); // expected-error {{asm-specifier for input or output variable conflicts with asm clobber list}}
  39   asm ("nop" : "=a" (a) : "b" (b) : "%rcx", "%rbx"); // expected-error {{asm-specifier for input or output variable conflicts with asm clobber list}}
  40 }
  41
  42 void test3(void) {
  43   int x;
  44   asm(L"foo" : "=r"(x)); // expected-error {{wide string}}
  45   asm("foo" : L"=r"(x)); // expected-error {{wide string}}
  46 }
  47
  48 void test4(const volatile void *addr)
  49 {
  50     asm ("nop" : : "r"(*addr)); /* expected-error {{invalid type 'const volatile void' in asm input for constraint 'r'}}
  51                                    expected-warning {{ISO C does not allow indirection on operand of type 'const volatile void *'}} */
  52     asm ("nop" : : "m"(*addr)); // expected-warning {{ISO C does not allow indirection on operand of type 'const volatile void *'}}
  53
  54     asm ("nop" : : "r"(test4(addr))); // expected-error {{invalid type 'void' in asm input for constraint 'r'}}
  55     asm ("nop" : : "m"(test4(addr))); // expected-error {{invalid lvalue in asm input for constraint 'm'}}
  56
  57     asm ("nop" : : "m"(f())); // expected-error {{invalid lvalue in asm input for constraint 'm'}}
  58 }
  59
  60 void test5(void) {
  61   asm("nop" : : "X" (8));
  62 }
  63
  64 // PR3385
  65 void test6(long i) {
  66   asm("nop" : : "er"(i));
  67 }
  68
  69 void asm_string_tests(int i) {
  70   asm("%!");   // simple asm string, %! is not an error.
  71   asm("%!" : );   // expected-error {{invalid % escape in inline assembly string}}
  72   asm("xyz %" : );   // expected-error {{invalid % escape in inline assembly string}}
  73
  74   asm ("%[somename]" :: [somename] "i"(4)); // ok
  75   asm ("%[somename]" :: "i"(4)); // expected-error {{unknown symbolic operand name in inline assembly string}}
  76   asm ("%[somename" :: "i"(4)); // expected-error {{unterminated symbolic operand name in inline assembly string}}
  77   asm ("%[]" :: "i"(4)); // expected-error {{empty symbolic operand name in inline assembly string}}
  78
  79   // PR3258
  80   asm("%9" :: "i"(4)); // expected-error {{invalid operand number in inline asm string}}
  81   asm("%1" : "+r"(i)); // ok, referring to input.
  82 }
  83
  84 // PR4077
  85 int test7(unsigned long long b) {
  86   int a;
  87   asm volatile("foo %0 %1" : "=a" (a) :"0" (b)); // expected-error {{input with type 'unsigned long long' matching output with type 'int'}}
  88   return a;
  89 }
  90
  91 // PR3904
  92 void test8(int i) {
  93   // A number in an input constraint can't point to a read-write constraint.
  94   asm("" : "+r" (i), "=r"(i) :  "0" (i)); // expected-error{{invalid input constraint '0' in asm}}
  95 }
  96
  97 // PR3905
  98 void test9(int i) {
  99   asm("" : [foo] "=r" (i), "=r"(i) : "1[foo]"(i)); // expected-error{{invalid input constraint '1[foo]' in asm}}
 100   asm("" : [foo] "=r" (i), "=r"(i) : "[foo]1"(i)); // expected-error{{invalid input constraint '[foo]1' in asm}}
 101 }
 102
 103 void test10(void){
 104   static int g asm ("g_asm") = 0;
 105   extern int gg asm ("gg_asm");
 106   __private_extern__ int ggg asm ("ggg_asm");
 107
 108   int a asm ("a_asm"); // expected-warning{{ignored asm label 'a_asm' on automatic variable}}
 109   auto int aa asm ("aa_asm"); // expected-warning{{ignored asm label 'aa_asm' on automatic variable}}
 110
 111   register int r asm ("cx");
 112   register int rr asm ("rr_asm"); // expected-error{{unknown register name 'rr_asm' in asm}}
 113   register int rrr asm ("%"); // expected-error{{unknown register name '%' in asm}}
 114 }
 115
 116 // This is just an assert because of the boolean conversion.
 117 // Feel free to change the assembly to something sensible if it causes a problem.
 118 void test11(void) {
 119   _Bool b;
 120   asm volatile ("movb %%gs:%P2,%b0" : "=q"(b) : "0"(0), "i"(5L));
 121 }
 122
 123 void test12(void) {
 124   register int cc __asm ("cc"); // expected-error{{unknown register name 'cc' in asm}}
 125 }
 126
 127 // PR10223
 128 void test13(void) {
 129   void *esp;
 130   __asm__ volatile ("mov %%esp, %o" : "=r"(esp) : : ); // expected-error {{invalid % escape in inline assembly string}}
 131 }
 132
 133 struct S;  // expected-note 2 {{forward declaration of 'struct S'}}
 134 void test14(struct S *s) {
 135   __asm("": : "a"(*s)); // expected-error {{dereference of pointer to incomplete type 'struct S'}}
 136   __asm("": "=a" (*s) :); // expected-error {{dereference of pointer to incomplete type 'struct S'}}
 137 }
 138
 139 // PR15759.
 140 double test15(void) {
 141   double ret = 0;
 142   __asm("0.0":"="(ret)); // expected-error {{invalid output constraint '=' in asm}}
 143   __asm("0.0":"=&"(ret)); // expected-error {{invalid output constraint '=&' in asm}}
 144   __asm("0.0":"+?"(ret)); // expected-error {{invalid output constraint '+?' in asm}}
 145   __asm("0.0":"+!"(ret)); // expected-error {{invalid output constraint '+!' in asm}}
 146   __asm("0.0":"+#"(ret)); // expected-error {{invalid output constraint '+#' in asm}}
 147   __asm("0.0":"+*"(ret)); // expected-error {{invalid output constraint '+*' in asm}}
 148   __asm("0.0":"=%"(ret)); // expected-error {{invalid output constraint '=%' in asm}}
 149   __asm("0.0":"=,="(ret)); // expected-error {{invalid output constraint '=,=' in asm}}
 150   __asm("0.0":"=,g"(ret)); // no-error
 151   __asm("0.0":"=g"(ret)); // no-error
 152   return ret;
 153 }
 154
 155 void iOutputConstraint(int x){
 156   __asm ("nop" : "=ir" (x) : :); // no-error
 157   __asm ("nop" : "=ri" (x) : :); // no-error
 158   __asm ("nop" : "=ig" (x) : :); // no-error
 159   __asm ("nop" : "=im" (x) : :); // no-error
 160   __asm ("nop" : "=imr" (x) : :); // no-error
 161   __asm ("nop" : "=i" (x) : :); // expected-error{{invalid output constraint '=i' in asm}}
 162   __asm ("nop" : "+i" (x) : :); // expected-error{{invalid output constraint '+i' in asm}}
 163   __asm ("nop" : "=ii" (x) : :); // expected-error{{invalid output constraint '=ii' in asm}}
 164   __asm ("nop" : "=nr" (x) : :); // no-error
 165   __asm ("nop" : "=rn" (x) : :); // no-error
 166   __asm ("nop" : "=ng" (x) : :); // no-error
 167   __asm ("nop" : "=nm" (x) : :); // no-error
 168   __asm ("nop" : "=nmr" (x) : :); // no-error
 169   __asm ("nop" : "=n" (x) : :); // expected-error{{invalid output constraint '=n' in asm}}
 170   __asm ("nop" : "+n" (x) : :); // expected-error{{invalid output constraint '+n' in asm}}
 171   __asm ("nop" : "=nn" (x) : :); // expected-error{{invalid output constraint '=nn' in asm}}
 172   __asm ("nop" : "=Fr" (x) : :); // no-error
 173   __asm ("nop" : "=rF" (x) : :); // no-error
 174   __asm ("nop" : "=Fg" (x) : :); // no-error
 175   __asm ("nop" : "=Fm" (x) : :); // no-error
 176   __asm ("nop" : "=Fmr" (x) : :); // no-error
 177   __asm ("nop" : "=F" (x) : :); // expected-error{{invalid output constraint '=F' in asm}}
 178   __asm ("nop" : "+F" (x) : :); // expected-error{{invalid output constraint '+F' in asm}}
 179   __asm ("nop" : "=FF" (x) : :); // expected-error{{invalid output constraint '=FF' in asm}}
 180   __asm ("nop" : "=Er" (x) : :); // no-error
 181   __asm ("nop" : "=rE" (x) : :); // no-error
 182   __asm ("nop" : "=Eg" (x) : :); // no-error
 183   __asm ("nop" : "=Em" (x) : :); // no-error
 184   __asm ("nop" : "=Emr" (x) : :); // no-error
 185   __asm ("nop" : "=E" (x) : :); // expected-error{{invalid output constraint '=E' in asm}}
 186   __asm ("nop" : "+E" (x) : :); // expected-error{{invalid output constraint '+E' in asm}}
 187   __asm ("nop" : "=EE" (x) : :); // expected-error{{invalid output constraint '=EE' in asm}}
 188 }
 189
 190 // PR19837
 191 struct foo {
 192   int a;
 193 };
 194 register struct foo bar asm("esp"); // expected-error {{bad type for named register variable}}
 195 register float baz asm("esp"); // expected-error {{bad type for named register variable}}
 196
 197 register int r0 asm ("edi"); // expected-error {{register 'edi' unsuitable for global register variables on this target}}
 198 register long long r1 asm ("esp"); // expected-error {{size of register 'esp' does not match variable size}}
 199 register int r2 asm ("esp");
 200
 201 double f_output_constraint(void) {
 202   double result;
 203   __asm("foo1": "=f" (result)); // expected-error {{invalid output constraint '=f' in asm}}
 204   return result;
 205 }
 206
 207 void fn1(void) {
 208   int l;
 209   __asm__(""
 210           : [l] "=r"(l)
 211           : "[l],m"(l)); // expected-error {{asm constraint has an unexpected number of alternatives: 1 vs 2}}
 212 }
 213
 214 void fn2(void) {
 215   int l;
 216  __asm__(""
 217           : "+&m"(l)); // expected-error {{invalid output constraint '+&m' in asm}}
 218 }
 219
 220 void fn3(void) {
 221   int l;
 222  __asm__(""
 223           : "+#r"(l)); // expected-error {{invalid output constraint '+#r' in asm}}
 224 }
 225
 226 void fn4(void) {
 227   int l;
 228  __asm__(""
 229           : "=r"(l)
 230           : "m#"(l));
 231 }
 232
 233 void fn5(void) {
 234   int l;
 235     __asm__(""
 236           : [g] "+r"(l)
 237           : "[g]"(l)); // expected-error {{invalid input constraint '[g]' in asm}}
 238 }
 239
 240 void fn6(void) {
 241     int a;
 242   __asm__(""
 243             : "=rm"(a), "=rm"(a)
 244             : "11m"(a)); // expected-error {{invalid input constraint '11m' in asm}}
 245 }
 246
 247 // PR14269
 248 typedef struct test16_foo {
 249   unsigned int field1 : 1;
 250   unsigned int field2 : 2;
 251   unsigned int field3 : 3;
 252 } test16_foo;
 253 typedef __attribute__((vector_size(16))) int test16_bar;
 254 register int test16_baz asm("esp");
 255
 256 void test16(void)
 257 {
 258   test16_foo a;
 259   test16_bar b;
 260
 261   __asm__("movl $5, %0"
 262           : "=rm" (a.field2)); // expected-error {{reference to a bit-field in asm input with a memory constraint '=rm'}}
 263   __asm__("movl $5, %0"
 264           :
 265           : "m" (a.field3)); // expected-error {{reference to a bit-field in asm output with a memory constraint 'm'}}
 266   __asm__("movl $5, %0"
 267           : "=rm" (b[2])); // expected-error {{reference to a vector element in asm input with a memory constraint '=rm'}}
 268   __asm__("movl $5, %0"
 269           :
 270           : "m" (b[3])); // expected-error {{reference to a vector element in asm output with a memory constraint 'm'}}
 271   __asm__("movl $5, %0"
 272           : "=rm" (test16_baz)); // expected-error {{reference to a global register variable in asm input with a memory constraint '=rm'}}
 273   __asm__("movl $5, %0"
 274           :
 275           : "m" (test16_baz)); // expected-error {{reference to a global register variable in asm output with a memory constraint 'm'}}
 276 }
 277
 278 int test17(int t0)
 279 {
 280   int r0, r1;
 281   __asm ("addl %2, %2\n\t"
 282          "movl $123, %0"
 283          : "=a" (r0),
 284            "=&r" (r1)
 285          : "1" (t0),   // expected-note {{constraint '1' is already present here}}
 286            "1" (t0));  // expected-error {{more than one input constraint matches the same output '1'}}
 287   return r0 + r1;
 288 }
 289
 290 void test18(void)
 291 {
 292   // expected-error@+2 {{duplicate use of asm operand name "lab"}}
 293   // expected-note@+1 {{asm operand name "lab" first referenced here}}
 294   asm goto ("" : : : : lab, lab, lab2, lab);
 295   // expected-error@+2 {{duplicate use of asm operand name "lab"}}
 296   // expected-note@+1 {{asm operand name "lab" first referenced here}}
 297   asm goto ("xorw %[lab], %[lab]; je %l[lab]" : : [lab] "i" (0) : : lab);
 298 lab:;
 299 lab2:;
 300   int x,x1;
 301   // expected-error@+2 {{duplicate use of asm operand name "lab"}}
 302   // expected-note@+1 {{asm operand name "lab" first referenced here}}
 303   asm ("" : [lab] "=r" (x),[lab] "+r" (x) : [lab1] "r" (x));
 304   // expected-error@+2 {{duplicate use of asm operand name "lab"}}
 305   // expected-note@+1 {{asm operand name "lab" first referenced here}}
 306   asm ("" : [lab] "=r" (x1) : [lab] "r" (x));
 307   // expected-error@+1 {{invalid operand number in inline asm string}}
 308   asm ("jne %l0":::);
 309   asm goto ("jne %l0"::::lab);
 310 }
 311
 312 typedef struct _st_size64 {
 313   int a;
 314   char b;
 315 } st_size64;
 316
 317 typedef struct _st_size96 {
 318   int a;
 319   int b;
 320   int c;
 321 } st_size96;
 322
 323 typedef struct _st_size16 {
 324   char a;
 325   char b;
 326 } st_size16;
 327
 328 typedef struct _st_size32 {
 329   char a;
 330   char b;
 331   char c;
 332   char d;
 333 } st_size32;
 334
 335 typedef struct _st_size128 {
 336   int a;
 337   int b;
 338   int c;
 339   int d;
 340 } st_size128;
 341
 342 void test19(long long x)
 343 {
 344   st_size64 a;
 345   st_size96 b;
 346   st_size16 c;
 347   st_size32 d;
 348   st_size128 e;
 349   asm ("" : "=rm" (a): "0" (1)); // no-error
 350   asm ("" : "=rm" (d): "0" (1)); // no-error
 351   asm ("" : "=rm" (c): "0" (x)); // no-error
 352   // FIXME: This case is actually supported by codegen.
 353   asm ("" : "=rm" (x): "0" (a)); // expected-error {{unsupported inline asm: input with type 'st_size64' (aka 'struct _st_size64') matching output with type 'long long'}}
 354   // FIXME: This case is actually supported by codegen.
 355   asm ("" : "=rm" (a): "0" (d)); // expected-error {{unsupported inline asm: input with type 'st_size32' (aka 'struct _st_size32') matching output with type 'st_size64' (aka 'struct _st_size64')}}
 356   asm ("" : "=rm" (b): "0" (1)); // expected-error {{impossible constraint in asm: can't store value into a register}}
 357   // FIXME: This case should be supported by codegen, but it fails now.
 358   asm ("" : "=rm" (e): "0" (1)); // no-error
 359   // FIXME: This case should be supported by codegen, but it fails now.
 360   asm ("" : "=rm" (x): "0" (e)); // expected-error {{unsupported inline asm: input with type 'st_size128' (aka 'struct _st_size128') matching output with type 'long long'}}
 361 }