// Copyright 2006-2008 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "src/base/logging.h" #include <cctype> #include <cstdarg> #include <cstdio> #include <cstdlib> #include "src/base/debug/stack_trace.h" #include "src/base/platform/platform.h" namespace v8 { namespace base { namespace { void DefaultDcheckHandler(const char* file, int line, const char* message); void (*g_print_stack_trace)() = nullptr; void (*g_dcheck_function)(const char*, int, const char*) = DefaultDcheckHandler; std::string PrettyPrintChar(int ch) { std::ostringstream oss; switch (ch) { #define CHAR_PRINT_CASE(ch) \ case ch: \ oss << #ch; \ break; CHAR_PRINT_CASE('\0') CHAR_PRINT_CASE('\'') CHAR_PRINT_CASE('\\') CHAR_PRINT_CASE('\a') CHAR_PRINT_CASE('\b') CHAR_PRINT_CASE('\f') CHAR_PRINT_CASE('\n') CHAR_PRINT_CASE('\r') CHAR_PRINT_CASE('\t') CHAR_PRINT_CASE('\v') #undef CHAR_PRINT_CASE default: if (std::isprint(ch)) { oss << '\'' << ch << '\''; } else { oss << std::hex << "\\x" << static_cast<unsigned int>(ch); } } return oss.str(); } void DefaultDcheckHandler(const char* file, int line, const char* message) { #ifdef DEBUG V8_Fatal(file, line, "Debug check failed: %s.", message); #else // This case happens only for unit tests. V8_Fatal("Debug check failed: %s.", message); #endif } } // namespace void SetPrintStackTrace(void (*print_stack_trace)()) { g_print_stack_trace = print_stack_trace; } void SetDcheckFunction(void (*dcheck_function)(const char*, int, const char*)) { g_dcheck_function = dcheck_function ? dcheck_function : &DefaultDcheckHandler; } // Define specialization to pretty print characters (escaping non-printable // characters) and to print c strings as pointers instead of strings. #define DEFINE_PRINT_CHECK_OPERAND_CHAR(type) \ template <> \ std::string PrintCheckOperand<type>(type ch) { \ return PrettyPrintChar(ch); \ } \ template <> \ std::string PrintCheckOperand<type*>(type * cstr) { \ return PrintCheckOperand<void*>(cstr); \ } \ template <> \ std::string PrintCheckOperand<const type*>(const type* cstr) { \ return PrintCheckOperand<const void*>(cstr); \ } DEFINE_PRINT_CHECK_OPERAND_CHAR(char) DEFINE_PRINT_CHECK_OPERAND_CHAR(signed char) DEFINE_PRINT_CHECK_OPERAND_CHAR(unsigned char) #undef DEFINE_PRINT_CHECK_OPERAND_CHAR // Explicit instantiations for commonly used comparisons. #define DEFINE_MAKE_CHECK_OP_STRING(type) \ template std::string* MakeCheckOpString<type, type>(type, type, \ char const*); \ template std::string PrintCheckOperand<type>(type); DEFINE_MAKE_CHECK_OP_STRING(int) DEFINE_MAKE_CHECK_OP_STRING(long) // NOLINT(runtime/int) DEFINE_MAKE_CHECK_OP_STRING(long long) // NOLINT(runtime/int) DEFINE_MAKE_CHECK_OP_STRING(unsigned int) DEFINE_MAKE_CHECK_OP_STRING(unsigned long) // NOLINT(runtime/int) DEFINE_MAKE_CHECK_OP_STRING(unsigned long long) // NOLINT(runtime/int) DEFINE_MAKE_CHECK_OP_STRING(void const*) #undef DEFINE_MAKE_CHECK_OP_STRING } // namespace base } // namespace v8 namespace { // FailureMessage is a stack allocated object which has a special marker field // at the start and at the end. This makes it possible to retrieve the embedded // message from the stack. // class FailureMessage { public: explicit FailureMessage(const char* format, va_list arguments) { memset(&message_, 0, arraysize(message_)); v8::base::OS::VSNPrintF(&message_[0], arraysize(message_), format, arguments); } static const uintptr_t kStartMarker = 0xdecade10; static const uintptr_t kEndMarker = 0xdecade11; static const int kMessageBufferSize = 512; uintptr_t start_marker_ = kStartMarker; char message_[kMessageBufferSize]; uintptr_t end_marker_ = kEndMarker; }; } // namespace #ifdef DEBUG void V8_Fatal(const char* file, int line, const char* format, ...) { #else void V8_Fatal(const char* format, ...) { const char* file = ""; int line = 0; #endif va_list arguments; va_start(arguments, format); // Format the error message into a stack object for later retrieveal by the // crash processor. FailureMessage message(format, arguments); va_end(arguments); fflush(stdout); fflush(stderr); // Print the formatted message to stdout without cropping the output. v8::base::OS::PrintError("\n\n#\n# Fatal error in %s, line %d\n# ", file, line); // Print the error message. va_start(arguments, format); v8::base::OS::VPrintError(format, arguments); va_end(arguments); // Print the message object's address to force stack allocation. v8::base::OS::PrintError("\n#\n#\n#\n#FailureMessage Object: %p", &message); if (v8::base::g_print_stack_trace) v8::base::g_print_stack_trace(); fflush(stderr); v8::base::OS::Abort(); } void V8_Dcheck(const char* file, int line, const char* message) { v8::base::g_dcheck_function(file, line, message); }