1 //===-- OptionGroupFormat.cpp -----------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Interpreter/OptionGroupFormat.h"
11 
12 #include "lldb/Host/OptionParser.h"
13 #include "lldb/Interpreter/CommandInterpreter.h"
14 #include "lldb/Target/ExecutionContext.h"
15 #include "lldb/Target/Target.h"
16 
17 using namespace lldb;
18 using namespace lldb_private;
19 
20 OptionGroupFormat::OptionGroupFormat(lldb::Format default_format,
21                                      uint64_t default_byte_size,
22                                      uint64_t default_count)
23     : m_format(default_format, default_format),
24       m_byte_size(default_byte_size, default_byte_size),
25       m_count(default_count, default_count), m_prev_gdb_format('x'),
26       m_prev_gdb_size('w') {}
27 
28 OptionGroupFormat::~OptionGroupFormat() {}
29 
30 static OptionDefinition g_option_table[] = {
31     {LLDB_OPT_SET_1, false, "format", 'f', OptionParser::eRequiredArgument,
32      nullptr, nullptr, 0, eArgTypeFormat,
33      "Specify a format to be used for display."},
34     {LLDB_OPT_SET_2, false, "gdb-format", 'G', OptionParser::eRequiredArgument,
35      nullptr, nullptr, 0, eArgTypeGDBFormat,
36      "Specify a format using a GDB format specifier string."},
37     {LLDB_OPT_SET_3, false, "size", 's', OptionParser::eRequiredArgument,
38      nullptr, nullptr, 0, eArgTypeByteSize,
39      "The size in bytes to use when displaying with the selected format."},
40     {LLDB_OPT_SET_4, false, "count", 'c', OptionParser::eRequiredArgument,
41      nullptr, nullptr, 0, eArgTypeCount,
42      "The number of total items to display."},
43 };
44 
45 llvm::ArrayRef<OptionDefinition> OptionGroupFormat::GetDefinitions() {
46   auto result = llvm::makeArrayRef(g_option_table);
47   if (m_byte_size.GetDefaultValue() < UINT64_MAX) {
48     if (m_count.GetDefaultValue() < UINT64_MAX)
49       return result;
50     else
51       return result.take_front(3);
52   }
53   return result.take_front(2);
54 }
55 
56 Status OptionGroupFormat::SetOptionValue(uint32_t option_idx,
57                                          llvm::StringRef option_arg,
58                                          ExecutionContext *execution_context) {
59   Status error;
60   const int short_option = g_option_table[option_idx].short_option;
61 
62   switch (short_option) {
63   case 'f':
64     error = m_format.SetValueFromString(option_arg);
65     break;
66 
67   case 'c':
68     if (m_count.GetDefaultValue() == 0) {
69       error.SetErrorString("--count option is disabled");
70     } else {
71       error = m_count.SetValueFromString(option_arg);
72       if (m_count.GetCurrentValue() == 0)
73         error.SetErrorStringWithFormat("invalid --count option value '%s'",
74                                        option_arg.str().c_str());
75     }
76     break;
77 
78   case 's':
79     if (m_byte_size.GetDefaultValue() == 0) {
80       error.SetErrorString("--size option is disabled");
81     } else {
82       error = m_byte_size.SetValueFromString(option_arg);
83       if (m_byte_size.GetCurrentValue() == 0)
84         error.SetErrorStringWithFormat("invalid --size option value '%s'",
85                                        option_arg.str().c_str());
86     }
87     break;
88 
89   case 'G': {
90     uint64_t count = 0;
91     llvm::StringRef gdb_format_str = option_arg;
92     gdb_format_str.consumeInteger(0, count);
93 
94     Format format = eFormatDefault;
95     uint32_t byte_size = 0;
96 
97     while (!gdb_format_str.empty() &&
98            ParserGDBFormatLetter(execution_context, gdb_format_str[0], format,
99                                  byte_size)) {
100       gdb_format_str = gdb_format_str.drop_front();
101     }
102 
103     // We the first character of the "gdb_format_str" is not the
104     // NULL terminator, we didn't consume the entire string and
105     // something is wrong. Also, if none of the format, size or count was
106     // specified correctly, then abort.
107     if (!gdb_format_str.empty() ||
108         (format == eFormatInvalid && byte_size == 0 && count == 0)) {
109       // Nothing got set correctly
110       error.SetErrorStringWithFormat("invalid gdb format string '%s'",
111                                      option_arg.str().c_str());
112       return error;
113     }
114 
115     // At least one of the format, size or count was set correctly. Anything
116     // that wasn't set correctly should be set to the previous default
117     if (format == eFormatInvalid)
118       ParserGDBFormatLetter(execution_context, m_prev_gdb_format, format,
119                             byte_size);
120 
121     const bool byte_size_enabled = m_byte_size.GetDefaultValue() < UINT64_MAX;
122     const bool count_enabled = m_count.GetDefaultValue() < UINT64_MAX;
123     if (byte_size_enabled) {
124       // Byte size is enabled
125       if (byte_size == 0)
126         ParserGDBFormatLetter(execution_context, m_prev_gdb_size, format,
127                               byte_size);
128     } else {
129       // Byte size is disabled, make sure it wasn't specified but if this is an
130       // address, it's actually necessary to specify one so don't error out
131       if (byte_size > 0 && format != lldb::eFormatAddressInfo) {
132         error.SetErrorString(
133             "this command doesn't support specifying a byte size");
134         return error;
135       }
136     }
137 
138     if (count_enabled) {
139       // Count is enabled and was not set, set it to the default for gdb format
140       // statements (which is 1).
141       if (count == 0)
142         count = 1;
143     } else {
144       // Count is disabled, make sure it wasn't specified
145       if (count > 0) {
146         error.SetErrorString("this command doesn't support specifying a count");
147         return error;
148       }
149     }
150 
151     m_format.SetCurrentValue(format);
152     m_format.SetOptionWasSet();
153     if (byte_size_enabled) {
154       m_byte_size.SetCurrentValue(byte_size);
155       m_byte_size.SetOptionWasSet();
156     }
157     if (count_enabled) {
158       m_count.SetCurrentValue(count);
159       m_count.SetOptionWasSet();
160     }
161   } break;
162 
163   default:
164     error.SetErrorStringWithFormat("unrecognized option '%c'", short_option);
165     break;
166   }
167 
168   return error;
169 }
170 
171 bool OptionGroupFormat::ParserGDBFormatLetter(
172     ExecutionContext *execution_context, char format_letter, Format &format,
173     uint32_t &byte_size) {
174   m_has_gdb_format = true;
175   switch (format_letter) {
176   case 'o':
177     format = eFormatOctal;
178     m_prev_gdb_format = format_letter;
179     return true;
180   case 'x':
181     format = eFormatHex;
182     m_prev_gdb_format = format_letter;
183     return true;
184   case 'd':
185     format = eFormatDecimal;
186     m_prev_gdb_format = format_letter;
187     return true;
188   case 'u':
189     format = eFormatUnsigned;
190     m_prev_gdb_format = format_letter;
191     return true;
192   case 't':
193     format = eFormatBinary;
194     m_prev_gdb_format = format_letter;
195     return true;
196   case 'f':
197     format = eFormatFloat;
198     m_prev_gdb_format = format_letter;
199     return true;
200   case 'a':
201     format = eFormatAddressInfo;
202     {
203       TargetSP target_sp =
204           execution_context ? execution_context->GetTargetSP() : TargetSP();
205       if (target_sp)
206         byte_size = target_sp->GetArchitecture().GetAddressByteSize();
207       m_prev_gdb_format = format_letter;
208       return true;
209     }
210   case 'i':
211     format = eFormatInstruction;
212     m_prev_gdb_format = format_letter;
213     return true;
214   case 'c':
215     format = eFormatChar;
216     m_prev_gdb_format = format_letter;
217     return true;
218   case 's':
219     format = eFormatCString;
220     m_prev_gdb_format = format_letter;
221     return true;
222   case 'T':
223     format = eFormatOSType;
224     m_prev_gdb_format = format_letter;
225     return true;
226   case 'A':
227     format = eFormatHexFloat;
228     m_prev_gdb_format = format_letter;
229     return true;
230 
231   case 'b':
232   case 'h':
233   case 'w':
234   case 'g':
235     {
236       // Size isn't used for printing instructions, so if a size is specified,
237       // and the previous format was 'i', then we should reset it to the
238       // default ('x').  Otherwise we'll continue to print as instructions,
239       // which isn't expected.
240       if (format_letter == 'b')
241           byte_size = 1;
242       else if (format_letter == 'h')
243           byte_size = 2;
244       else if (format_letter == 'w')
245           byte_size = 4;
246       else if (format_letter == 'g')
247           byte_size = 8;
248 
249         m_prev_gdb_size = format_letter;
250         if (m_prev_gdb_format == 'i')
251           m_prev_gdb_format = 'x';
252         return true;
253     }
254     break;
255   default:
256     break;
257   }
258 
259 
260   return false;
261 }
262 
263 void OptionGroupFormat::OptionParsingStarting(
264     ExecutionContext *execution_context) {
265   m_format.Clear();
266   m_byte_size.Clear();
267   m_count.Clear();
268   m_has_gdb_format = false;
269 }
270