1// -*- mode: C++ -*-
2
3// Copyright (c) 2010 Google Inc.
4// All rights reserved.
5//
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30// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31
32// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
33
34// dump_stabs.h: Define the StabsToModule class, which receives
35// STABS debugging information from a parser and adds it to a Breakpad
36// symbol file.
37
38#ifndef BREAKPAD_COMMON_STABS_TO_MODULE_H_
39#define BREAKPAD_COMMON_STABS_TO_MODULE_H_
40
41#include <stdint.h>
42
43#include <string>
44#include <vector>
45
46#include "common/module.h"
47#include "common/stabs_reader.h"
48#include "common/using_std_string.h"
49
50namespace google_breakpad {
51
52using std::vector;
53
54// A StabsToModule is a handler that receives parsed STABS debugging
55// information from a StabsReader, and uses that to populate
56// a Module. (All classes are in the google_breakpad namespace.) A
57// Module represents the contents of a Breakpad symbol file, and knows
58// how to write itself out as such. A StabsToModule thus acts as
59// the bridge between STABS and Breakpad data.
60// When processing Darwin Mach-O files, this also receives public linker
61// symbols, like those found in system libraries.
62class StabsToModule: public google_breakpad::StabsHandler {
63 public:
64 // Receive parsed debugging information from a StabsReader, and
65 // store it all in MODULE.
66 StabsToModule(Module *module) :
67 module_(module),
68 in_compilation_unit_(false),
69 comp_unit_base_address_(0),
70 current_function_(NULL),
71 current_source_file_(NULL),
72 current_source_file_name_(NULL) { }
73 ~StabsToModule();
74
75 // The standard StabsHandler virtual member functions.
76 bool StartCompilationUnit(const char *name, uint64_t address,
77 const char *build_directory);
78 bool EndCompilationUnit(uint64_t address);
79 bool StartFunction(const string& name, uint64_t address);
80 bool EndFunction(uint64_t address);
81 bool Line(uint64_t address, const char *name, int number);
82 bool Extern(const string& name, uint64_t address);
83 void Warning(const char *format, ...);
84
85 // Do any final processing necessary to make module_ contain all the
86 // data provided by the STABS reader.
87 //
88 // Because STABS does not provide reliable size information for
89 // functions and lines, we need to make a pass over the data after
90 // processing all the STABS to compute those sizes. We take care of
91 // that here.
92 void Finalize();
93
94 private:
95
96 // An arbitrary, but very large, size to use for functions whose
97 // size we can't compute properly.
98 static const uint64_t kFallbackSize = 0x10000000;
99
100 // The module we're contributing debugging info to.
101 Module *module_;
102
103 // The functions we've generated so far. We don't add these to
104 // module_ as we parse them. Instead, we wait until we've computed
105 // their ending address, and their lines' ending addresses.
106 //
107 // We could just stick them in module_ from the outset, but if
108 // module_ already contains data gathered from other debugging
109 // formats, that would complicate the size computation.
110 vector<Module::Function*> functions_;
111
112 // Boundary addresses. STABS doesn't necessarily supply sizes for
113 // functions and lines, so we need to compute them ourselves by
114 // finding the next object.
115 vector<Module::Address> boundaries_;
116
117 // True if we are currently within a compilation unit: we have gotten a
118 // StartCompilationUnit call, but no matching EndCompilationUnit call
119 // yet. We use this for sanity checks.
120 bool in_compilation_unit_;
121
122 // The base address of the current compilation unit. We use this to
123 // recognize functions we should omit from the symbol file. (If you
124 // know the details of why we omit these, please patch this
125 // comment.)
126 Module::Address comp_unit_base_address_;
127
128 // The function we're currently contributing lines to.
129 Module::Function *current_function_;
130
131 // The last Module::File we got a line number in.
132 Module::File *current_source_file_;
133
134 // The pointer in the .stabstr section of the name that
135 // current_source_file_ is built from. This allows us to quickly
136 // recognize when the current line is in the same file as the
137 // previous one (which it usually is).
138 const char *current_source_file_name_;
139};
140
141} // namespace google_breakpad
142
143#endif // BREAKPAD_COMMON_STABS_TO_MODULE_H_
144