1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CRAZY_LINKER_THREAD_H 6 #define CRAZY_LINKER_THREAD_H 7 8 #include <stdarg.h> 9 #include <stddef.h> 10 11 namespace crazy { 12 13 // Per-thread context used during crazy linker operations. 14 class ThreadData { 15 16 public: 17 ThreadData() {} 18 19 // Init new ThreadData instance. 20 void Init(); 21 22 // Return the current error message. This also clears the internal 23 // error message, which means that the next call to this method 24 // will return a pointer to an empty string unless AppendError() 25 // was called. 26 const char* GetError() const { return dlerror_; } 27 28 // Swap the error buffers. 29 void SwapErrorBuffers(); 30 31 // Set message string in current dlerror buffer. 32 void SetError(const char* fmt, ...) { 33 va_list args; 34 va_start(args, fmt); 35 SetErrorArgs(fmt, args); 36 va_end(args); 37 } 38 39 void SetErrorArgs(const char* fmt, va_list args); 40 41 // Append message string to current dlerror buffer. 42 void AppendError(const char* fmt, ...) { 43 va_list args; 44 va_start(args, fmt); 45 AppendErrorArgs(fmt, args); 46 va_end(args); 47 } 48 49 void AppendErrorArgs(const char* fmt, va_list args); 50 51 private: 52 // Pointer to the current dlerror buffer. This points to one 53 // of the dlerror_buffers[] arrays, swapped on each dlerror() 54 // call. 55 char* dlerror_; 56 57 // Size of each dlerror message buffer size. 58 static const size_t kBufferSize = 512; 59 60 // Two buffers used to store dlerror messages. 61 char dlerror_buffers_[2][kBufferSize]; 62 }; 63 64 // Retrieves the ThreadData structure for the current thread. 65 // The first time this is called on a given thread, this creates 66 // a fresh new object, so this should never return NULL. 67 ThreadData* GetThreadData(); 68 69 // Faster variant that should only be called when GetThreadData() was 70 // called at least once on the current thread. 71 ThreadData* GetThreadDataFast(); 72 73 // Set the linker error string for the current thread. 74 void SetLinkerErrorString(const char* str); 75 76 // Set the formatted linker error for the current thread. 77 void SetLinkerError(const char* fmt, ...); 78 79 } // namespace crazy; 80 81 #endif // CRAZY_LINKER_THREAD_H 82
