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
3 // found in the LICENSE file.
4 
5 #include "base/location.h"
6 
7 #if defined(COMPILER_MSVC)
8 #include <intrin.h>
9 #endif
10 
11 #include "base/compiler_specific.h"
12 #include "base/strings/string_number_conversions.h"
13 #include "base/strings/stringprintf.h"
14 #include "build/build_config.h"
15 
16 namespace base {
17 
18 Location::Location() = default;
19 Location::Location(const Location& other) = default;
20 
Location(const char * file_name,const void * program_counter)21 Location::Location(const char* file_name, const void* program_counter)
22     : file_name_(file_name), program_counter_(program_counter) {}
23 
Location(const char * function_name,const char * file_name,int line_number,const void * program_counter)24 Location::Location(const char* function_name,
25                    const char* file_name,
26                    int line_number,
27                    const void* program_counter)
28     : function_name_(function_name),
29       file_name_(file_name),
30       line_number_(line_number),
31       program_counter_(program_counter) {
32 #if !defined(OS_NACL)
33   // The program counter should not be null except in a default constructed
34   // (empty) Location object. This value is used for identity, so if it doesn't
35   // uniquely identify a location, things will break.
36   //
37   // The program counter isn't supported in NaCl so location objects won't work
38   // properly in that context.
39   DCHECK(program_counter);
40 #endif
41 }
42 
ToString() const43 std::string Location::ToString() const {
44   if (has_source_info()) {
45     return std::string(function_name_) + "@" + file_name_ + ":" +
46            IntToString(line_number_);
47   }
48   return StringPrintf("pc:%p", program_counter_);
49 }
50 
51 #if defined(COMPILER_MSVC)
52 #define RETURN_ADDRESS() _ReturnAddress()
53 #elif defined(COMPILER_GCC) && !defined(OS_NACL)
54 #define RETURN_ADDRESS() \
55   __builtin_extract_return_addr(__builtin_return_address(0))
56 #else
57 #define RETURN_ADDRESS() nullptr
58 #endif
59 
60 // static
CreateFromHere(const char * file_name)61 NOINLINE Location Location::CreateFromHere(const char* file_name) {
62   return Location(file_name, RETURN_ADDRESS());
63 }
64 
65 // static
CreateFromHere(const char * function_name,const char * file_name,int line_number)66 NOINLINE Location Location::CreateFromHere(const char* function_name,
67                                            const char* file_name,
68                                            int line_number) {
69   return Location(function_name, file_name, line_number, RETURN_ADDRESS());
70 }
71 
72 //------------------------------------------------------------------------------
GetProgramCounter()73 NOINLINE const void* GetProgramCounter() {
74   return RETURN_ADDRESS();
75 }
76 
77 }  // namespace base
78