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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_LOGGING_H_ | 5 #ifndef BASE_LOGGING_H_ |
6 #define BASE_LOGGING_H_ | 6 #define BASE_LOGGING_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include <cassert> | 10 #include <cassert> |
11 #include <cstring> | 11 #include <cstring> |
12 #include <sstream> | 12 #include <sstream> |
13 #include <string> | 13 #include <string> |
14 #include <type_traits> | 14 #include <type_traits> |
15 #include <utility> | 15 #include <utility> |
16 | 16 |
17 #include "base/base_export.h" | 17 #include "base/base_export.h" |
18 #include "base/compiler_specific.h" | |
18 #include "base/debug/debugger.h" | 19 #include "base/debug/debugger.h" |
19 #include "base/macros.h" | 20 #include "base/macros.h" |
20 #include "base/template_util.h" | 21 #include "base/template_util.h" |
21 #include "build/build_config.h" | 22 #include "build/build_config.h" |
22 | 23 |
23 // | 24 // |
24 // Optional message capabilities | 25 // Optional message capabilities |
25 // ----------------------------- | 26 // ----------------------------- |
26 // Assertion failed messages and fatal errors are displayed in a dialog box | 27 // Assertion failed messages and fatal errors are displayed in a dialog box |
27 // before the application exits. However, running this UI creates a message | 28 // before the application exits. However, running this UI creates a message |
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451 // | 452 // |
452 // We make sure CHECK et al. always evaluates their arguments, as | 453 // We make sure CHECK et al. always evaluates their arguments, as |
453 // doing CHECK(FunctionWithSideEffect()) is a common idiom. | 454 // doing CHECK(FunctionWithSideEffect()) is a common idiom. |
454 | 455 |
455 #if defined(OFFICIAL_BUILD) && defined(NDEBUG) | 456 #if defined(OFFICIAL_BUILD) && defined(NDEBUG) |
456 | 457 |
457 // Make all CHECK functions discard their log strings to reduce code | 458 // Make all CHECK functions discard their log strings to reduce code |
458 // bloat, and improve performance, for official release builds. | 459 // bloat, and improve performance, for official release builds. |
459 | 460 |
460 #if defined(COMPILER_GCC) || __clang__ | 461 #if defined(COMPILER_GCC) || __clang__ |
461 #define LOGGING_CRASH() __builtin_trap() | 462 |
462 #else | 463 // This is to make sure that the crash report can pinpoint to the right source |
463 #define LOGGING_CRASH() ((void)(*(volatile char*)0 = 0)) | 464 // line even in presence of multiple CHECK()s in the same function. See |
465 // http://crbug.com/664209 for more context. | |
466 // There are three things we need to guarantee here: | |
467 // - The trap instructions, and hence the PC value at crash time, are distinct | |
468 // and don't get collapsed into the same op due to compiler optimizations. | |
469 // - The debug line info for the trap instructions get attributed to the caller | |
470 // of CHECK(), to make sure that crash reports show actionable data. This in | |
471 // practice rules out the ability of using a inline function, at least as | |
472 // long as clang doesn't support attribute(artificial). | |
473 // - The compiler should treat the CHECK as no-return instructions, so that the | |
474 // trap code can be efficiently packed in the prologue of the function and | |
475 // doesn't interfere with the main execution flow. | |
476 // Code-wise: | |
477 // - The asm volatile statement is a cross-architecture version of | |
478 // mov %eax, LINE. It guarantees that the assembly is unique for each line | |
479 // and the multiple crash instructions generated by CHECK() don't get folded. | |
480 // - __builtin_trap() is the instruction that actually causes the crash, | |
481 // either a SIGTRAP or a SIGABRT depending on the platform. | |
482 // - __builtin_unreachable() enables no-return optimizations. | |
483 #define LOGGING_CRASH(LINE) \ | |
484 ({ \ | |
485 asm volatile("" : : "r"(LINE) : "memory"); \ | |
486 __builtin_trap(); \ | |
487 __builtin_unreachable(); \ | |
488 }) | |
489 | |
490 #else // !(defined(COMPILER_GCC) || __clang__) | |
491 #define LOGGING_CRASH(LINE) ((void)(*(volatile char*)0 = 0)) | |
Nico
2016/12/02 02:04:03
This doesn't help on Windows, does it. Would
((
| |
464 #endif | 492 #endif |
465 | 493 |
466 // This is not calling BreakDebugger since this is called frequently, and | 494 // This is not calling BreakDebugger since this is called frequently, and |
467 // calling an out-of-line function instead of a noreturn inline macro prevents | 495 // calling an out-of-line function instead of a noreturn inline macro prevents |
468 // compiler optimizations. | 496 // compiler optimizations. |
469 #define CHECK(condition) \ | 497 #define CHECK(condition) \ |
470 !(condition) ? LOGGING_CRASH() : EAT_STREAM_PARAMETERS | 498 !(condition) ? LOGGING_CRASH(__LINE__) : EAT_STREAM_PARAMETERS |
471 | 499 |
472 #define PCHECK(condition) CHECK(condition) | 500 #define PCHECK(condition) CHECK(condition) |
473 | 501 |
474 #define CHECK_OP(name, op, val1, val2) CHECK((val1) op (val2)) | 502 #define CHECK_OP(name, op, val1, val2) CHECK((val1) op (val2)) |
475 | 503 |
476 #else // !(OFFICIAL_BUILD && NDEBUG) | 504 #else // !(OFFICIAL_BUILD && NDEBUG) |
477 | 505 |
478 #if defined(_PREFAST_) && defined(OS_WIN) | 506 #if defined(_PREFAST_) && defined(OS_WIN) |
479 // Use __analysis_assume to tell the VC++ static analysis engine that | 507 // Use __analysis_assume to tell the VC++ static analysis engine that |
480 // assert conditions are true, to suppress warnings. The LAZY_STREAM | 508 // assert conditions are true, to suppress warnings. The LAZY_STREAM |
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988 #elif NOTIMPLEMENTED_POLICY == 5 | 1016 #elif NOTIMPLEMENTED_POLICY == 5 |
989 #define NOTIMPLEMENTED() do {\ | 1017 #define NOTIMPLEMENTED() do {\ |
990 static bool logged_once = false;\ | 1018 static bool logged_once = false;\ |
991 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\ | 1019 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\ |
992 logged_once = true;\ | 1020 logged_once = true;\ |
993 } while(0);\ | 1021 } while(0);\ |
994 EAT_STREAM_PARAMETERS | 1022 EAT_STREAM_PARAMETERS |
995 #endif | 1023 #endif |
996 | 1024 |
997 #endif // BASE_LOGGING_H_ | 1025 #endif // BASE_LOGGING_H_ |
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