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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef RUNTIME_PLATFORM_GLOBALS_H_ | 5 #ifndef RUNTIME_PLATFORM_GLOBALS_H_ |
6 #define RUNTIME_PLATFORM_GLOBALS_H_ | 6 #define RUNTIME_PLATFORM_GLOBALS_H_ |
7 | 7 |
8 // __STDC_FORMAT_MACROS has to be defined before including <inttypes.h> to | 8 // __STDC_FORMAT_MACROS has to be defined before including <inttypes.h> to |
9 // enable platform independent printf format specifiers. | 9 // enable platform independent printf format specifiers. |
10 #ifndef __STDC_FORMAT_MACROS | 10 #ifndef __STDC_FORMAT_MACROS |
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281 #endif | 281 #endif |
282 | 282 |
283 // DART_UNUSED inidicates to the compiler that a variable/typedef is expected | 283 // DART_UNUSED inidicates to the compiler that a variable/typedef is expected |
284 // to be unused and disables the related warning. | 284 // to be unused and disables the related warning. |
285 #ifdef __GNUC__ | 285 #ifdef __GNUC__ |
286 #define DART_UNUSED __attribute__((unused)) | 286 #define DART_UNUSED __attribute__((unused)) |
287 #else | 287 #else |
288 #define DART_UNUSED | 288 #define DART_UNUSED |
289 #endif | 289 #endif |
290 | 290 |
291 // DART_NORETURN indicates to the compiler that a function doees not return. | 291 // DART_NORETURN indicates to the compiler that a function does not return. |
292 // It should be used on functions that unconditionally call functions like | 292 // It should be used on functions that unconditionally call functions like |
293 // exit(), which end the program. We use it to avoid compiler warnings in | 293 // exit(), which end the program. We use it to avoid compiler warnings in |
294 // callers of DART_NORETURN functions. | 294 // callers of DART_NORETURN functions. |
295 #ifdef _MSC_VER | 295 #ifdef _MSC_VER |
296 #define DART_NORETURN __declspec(noreturn) | 296 #define DART_NORETURN __declspec(noreturn) |
297 #elif __GNUC__ | 297 #elif __GNUC__ |
298 #define DART_NORETURN __attribute__((noreturn)) | 298 #define DART_NORETURN __attribute__((noreturn)) |
299 #else | 299 #else |
300 #error Automatic compiler detection failed. | 300 #error Automatic compiler detection failed. |
301 #endif | 301 #endif |
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572 static inline void USE(T) {} | 572 static inline void USE(T) {} |
573 | 573 |
574 | 574 |
575 // Use implicit_cast as a safe version of static_cast or const_cast | 575 // Use implicit_cast as a safe version of static_cast or const_cast |
576 // for upcasting in the type hierarchy (i.e. casting a pointer to Foo | 576 // for upcasting in the type hierarchy (i.e. casting a pointer to Foo |
577 // to a pointer to SuperclassOfFoo or casting a pointer to Foo to | 577 // to a pointer to SuperclassOfFoo or casting a pointer to Foo to |
578 // a const pointer to Foo). | 578 // a const pointer to Foo). |
579 // When you use implicit_cast, the compiler checks that the cast is safe. | 579 // When you use implicit_cast, the compiler checks that the cast is safe. |
580 // Such explicit implicit_casts are necessary in surprisingly many | 580 // Such explicit implicit_casts are necessary in surprisingly many |
581 // situations where C++ demands an exact type match instead of an | 581 // situations where C++ demands an exact type match instead of an |
582 // argument type convertable to a target type. | 582 // argument type convertible to a target type. |
583 // | 583 // |
584 // The From type can be inferred, so the preferred syntax for using | 584 // The From type can be inferred, so the preferred syntax for using |
585 // implicit_cast is the same as for static_cast etc.: | 585 // implicit_cast is the same as for static_cast etc.: |
586 // | 586 // |
587 // implicit_cast<ToType>(expr) | 587 // implicit_cast<ToType>(expr) |
588 // | 588 // |
589 // implicit_cast would have been part of the C++ standard library, | 589 // implicit_cast would have been part of the C++ standard library, |
590 // but the proposal was submitted too late. It will probably make | 590 // but the proposal was submitted too late. It will probably make |
591 // its way into the language in the future. | 591 // its way into the language in the future. |
592 template <typename To, typename From> | 592 template <typename To, typename From> |
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710 // tag in the ICData and check it when recreating the flow graph in | 710 // tag in the ICData and check it when recreating the flow graph in |
711 // optimizing compiler. Enable it for other modes (product, release) if needed | 711 // optimizing compiler. Enable it for other modes (product, release) if needed |
712 // for debugging. | 712 // for debugging. |
713 #if defined(DEBUG) | 713 #if defined(DEBUG) |
714 #define TAG_IC_DATA | 714 #define TAG_IC_DATA |
715 #endif | 715 #endif |
716 | 716 |
717 } // namespace dart | 717 } // namespace dart |
718 | 718 |
719 #endif // RUNTIME_PLATFORM_GLOBALS_H_ | 719 #endif // RUNTIME_PLATFORM_GLOBALS_H_ |
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