xref: /llvm-project/lldb/source/Interpreter/OptionArgParser.cpp (revision 0642cd768b80665585c8500bed2933a3b99123dc)
1 //===-- OptionArgParser.cpp -----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "lldb/Interpreter/OptionArgParser.h"
10 #include "lldb/DataFormatters/FormatManager.h"
11 #include "lldb/Target/ABI.h"
12 #include "lldb/Target/RegisterContext.h"
13 #include "lldb/Target/Target.h"
14 #include "lldb/Utility/RegisterValue.h"
15 #include "lldb/Utility/Status.h"
16 #include "lldb/Utility/StreamString.h"
17 
18 using namespace lldb_private;
19 using namespace lldb;
20 
21 bool OptionArgParser::ToBoolean(llvm::StringRef ref, bool fail_value,
22                                 bool *success_ptr) {
23   if (success_ptr)
24     *success_ptr = true;
25   ref = ref.trim();
26   if (ref.equals_insensitive("false") || ref.equals_insensitive("off") ||
27       ref.equals_insensitive("no") || ref.equals_insensitive("0")) {
28     return false;
29   } else if (ref.equals_insensitive("true") || ref.equals_insensitive("on") ||
30              ref.equals_insensitive("yes") || ref.equals_insensitive("1")) {
31     return true;
32   }
33   if (success_ptr)
34     *success_ptr = false;
35   return fail_value;
36 }
37 
38 llvm::Expected<bool> OptionArgParser::ToBoolean(llvm::StringRef option_name,
39                                                 llvm::StringRef option_arg) {
40   bool parse_success;
41   const bool option_value =
42       ToBoolean(option_arg, false /* doesn't matter */, &parse_success);
43   if (parse_success)
44     return option_value;
45   else
46     return llvm::createStringError(
47         "Invalid boolean value for option '%s': '%s'",
48         option_name.str().c_str(),
49         option_arg.empty() ? "<null>" : option_arg.str().c_str());
50 }
51 
52 char OptionArgParser::ToChar(llvm::StringRef s, char fail_value,
53                              bool *success_ptr) {
54   if (success_ptr)
55     *success_ptr = false;
56   if (s.size() != 1)
57     return fail_value;
58 
59   if (success_ptr)
60     *success_ptr = true;
61   return s[0];
62 }
63 
64 int64_t OptionArgParser::ToOptionEnum(llvm::StringRef s,
65                                       const OptionEnumValues &enum_values,
66                                       int32_t fail_value, Status &error) {
67   error.Clear();
68   if (enum_values.empty()) {
69     error = Status::FromErrorString("invalid enumeration argument");
70     return fail_value;
71   }
72 
73   if (s.empty()) {
74     error = Status::FromErrorString("empty enumeration string");
75     return fail_value;
76   }
77 
78   for (const auto &enum_value : enum_values) {
79     llvm::StringRef this_enum(enum_value.string_value);
80     if (this_enum.starts_with(s))
81       return enum_value.value;
82   }
83 
84   StreamString strm;
85   strm.PutCString("invalid enumeration value, valid values are: ");
86   bool is_first = true;
87   for (const auto &enum_value : enum_values) {
88     strm.Printf("%s\"%s\"",
89         is_first ? is_first = false,"" : ", ", enum_value.string_value);
90   }
91   error = Status(strm.GetString().str());
92   return fail_value;
93 }
94 
95 Status OptionArgParser::ToFormat(const char *s, lldb::Format &format,
96                                  size_t *byte_size_ptr) {
97   format = eFormatInvalid;
98   Status error;
99 
100   if (s && s[0]) {
101     if (byte_size_ptr) {
102       if (isdigit(s[0])) {
103         char *format_char = nullptr;
104         unsigned long byte_size = ::strtoul(s, &format_char, 0);
105         if (byte_size != ULONG_MAX)
106           *byte_size_ptr = byte_size;
107         s = format_char;
108       } else
109         *byte_size_ptr = 0;
110     }
111 
112     if (!FormatManager::GetFormatFromCString(s, format)) {
113       StreamString error_strm;
114       error_strm.Printf(
115           "Invalid format character or name '%s'. Valid values are:\n", s);
116       for (Format f = eFormatDefault; f < kNumFormats; f = Format(f + 1)) {
117         char format_char = FormatManager::GetFormatAsFormatChar(f);
118         if (format_char)
119           error_strm.Printf("'%c' or ", format_char);
120 
121         error_strm.Printf("\"%s\"", FormatManager::GetFormatAsCString(f));
122         error_strm.EOL();
123       }
124 
125       if (byte_size_ptr)
126         error_strm.PutCString(
127             "An optional byte size can precede the format character.\n");
128       error = Status(error_strm.GetString().str());
129     }
130 
131     if (error.Fail())
132       return error;
133   } else {
134     error = Status::FromErrorStringWithFormat("%s option string",
135                                               s ? "empty" : "invalid");
136   }
137   return error;
138 }
139 
140 lldb::ScriptLanguage OptionArgParser::ToScriptLanguage(
141     llvm::StringRef s, lldb::ScriptLanguage fail_value, bool *success_ptr) {
142   if (success_ptr)
143     *success_ptr = true;
144 
145   if (s.equals_insensitive("python"))
146     return eScriptLanguagePython;
147   if (s.equals_insensitive("lua"))
148     return eScriptLanguageLua;
149   if (s.equals_insensitive("default"))
150     return eScriptLanguageDefault;
151   if (s.equals_insensitive("none"))
152     return eScriptLanguageNone;
153 
154   if (success_ptr)
155     *success_ptr = false;
156   return fail_value;
157 }
158 
159 lldb::addr_t OptionArgParser::ToRawAddress(const ExecutionContext *exe_ctx,
160                                            llvm::StringRef s,
161                                            lldb::addr_t fail_value,
162                                            Status *error_ptr) {
163   std::optional<lldb::addr_t> maybe_addr = DoToAddress(exe_ctx, s, error_ptr);
164   return maybe_addr ? *maybe_addr : fail_value;
165 }
166 
167 lldb::addr_t OptionArgParser::ToAddress(const ExecutionContext *exe_ctx,
168                                         llvm::StringRef s,
169                                         lldb::addr_t fail_value,
170                                         Status *error_ptr) {
171   std::optional<lldb::addr_t> maybe_addr = DoToAddress(exe_ctx, s, error_ptr);
172   if (!maybe_addr)
173     return fail_value;
174 
175   lldb::addr_t addr = *maybe_addr;
176 
177   if (Process *process = exe_ctx->GetProcessPtr())
178     if (ABISP abi_sp = process->GetABI())
179       addr = abi_sp->FixCodeAddress(addr);
180 
181   return addr;
182 }
183 
184 std::optional<lldb::addr_t>
185 OptionArgParser::DoToAddress(const ExecutionContext *exe_ctx, llvm::StringRef s,
186                              Status *error_ptr) {
187   if (s.empty()) {
188     if (error_ptr)
189       *error_ptr = Status::FromErrorStringWithFormat(
190           "invalid address expression \"%s\"", s.str().c_str());
191     return {};
192   }
193 
194   llvm::StringRef sref = s;
195 
196   lldb::addr_t addr = LLDB_INVALID_ADDRESS;
197   if (!s.getAsInteger(0, addr)) {
198     if (error_ptr)
199       error_ptr->Clear();
200 
201     return addr;
202   }
203 
204   // Try base 16 with no prefix...
205   if (!s.getAsInteger(16, addr)) {
206     if (error_ptr)
207       error_ptr->Clear();
208     return addr;
209   }
210 
211   Target *target = nullptr;
212   if (!exe_ctx || !(target = exe_ctx->GetTargetPtr())) {
213     if (error_ptr)
214       *error_ptr = Status::FromErrorStringWithFormat(
215           "invalid address expression \"%s\"", s.str().c_str());
216     return {};
217   }
218 
219   lldb::ValueObjectSP valobj_sp;
220   EvaluateExpressionOptions options;
221   options.SetCoerceToId(false);
222   options.SetUnwindOnError(true);
223   options.SetKeepInMemory(false);
224   options.SetTryAllThreads(true);
225 
226   ExpressionResults expr_result =
227       target->EvaluateExpression(s, exe_ctx->GetFramePtr(), valobj_sp, options);
228 
229   bool success = false;
230   if (expr_result == eExpressionCompleted) {
231     if (valobj_sp)
232       valobj_sp = valobj_sp->GetQualifiedRepresentationIfAvailable(
233           valobj_sp->GetDynamicValueType(), true);
234     // Get the address to watch.
235     if (valobj_sp)
236       addr = valobj_sp->GetValueAsUnsigned(0, &success);
237     if (success) {
238       if (error_ptr)
239         error_ptr->Clear();
240       return addr;
241     }
242     if (error_ptr)
243       *error_ptr = Status::FromErrorStringWithFormat(
244           "address expression \"%s\" resulted in a value whose type "
245           "can't be converted to an address: %s",
246           s.str().c_str(), valobj_sp->GetTypeName().GetCString());
247     return {};
248   }
249 
250   // Since the compiler can't handle things like "main + 12" we should try to
251   // do this for now. The compiler doesn't like adding offsets to function
252   // pointer types.
253   // Some languages also don't have a natural representation for register
254   // values (e.g. swift) so handle simple uses of them here as well.
255   // We use a regex to parse these forms, the regex handles:
256   // $reg_name
257   // $reg_name+offset
258   // symbol_name+offset
259   //
260   // The important matching elements in the regex below are:
261   // 1: The reg name if there's no +offset
262   // 3: The symbol/reg name if there is an offset
263   // 4: +/-
264   // 5: The offset value.
265   static RegularExpression g_symbol_plus_offset_regex(
266       "^(\\$[^ +-]+)|(([^ +-]+)([-\\+])[[:space:]]*(0x[0-9A-Fa-f]+|[0-9]+)[[:space:]]*)$");
267 
268   llvm::SmallVector<llvm::StringRef, 4> matches;
269   if (g_symbol_plus_offset_regex.Execute(sref, &matches)) {
270     uint64_t offset = 0;
271     llvm::StringRef name;
272     if (!matches[1].empty())
273       name = matches[1];
274     else
275       name = matches[3];
276 
277     llvm::StringRef sign = matches[4];
278     llvm::StringRef str_offset = matches[5];
279 
280     // Some languages don't have a natural type for register values, but it
281     // is still useful to look them up here:
282     std::optional<lldb::addr_t> register_value;
283     StackFrame *frame = exe_ctx->GetFramePtr();
284     llvm::StringRef reg_name = name;
285     if (frame && reg_name.consume_front("$")) {
286       RegisterContextSP reg_ctx_sp = frame->GetRegisterContext();
287       if (reg_ctx_sp) {
288         const RegisterInfo *reg_info = reg_ctx_sp->GetRegisterInfoByName(reg_name);
289         if (reg_info) {
290           RegisterValue reg_val;
291           bool success = reg_ctx_sp->ReadRegister(reg_info, reg_val);
292           if (success && reg_val.GetType() != RegisterValue::eTypeInvalid) {
293             register_value = reg_val.GetAsUInt64(0, &success);
294             if (!success)
295               register_value.reset();
296           }
297         }
298       }
299     }
300     if (!str_offset.empty() && !str_offset.getAsInteger(0, offset)) {
301       Status error;
302       if (register_value)
303         addr = register_value.value();
304       else
305         addr = ToAddress(exe_ctx, name, LLDB_INVALID_ADDRESS, &error);
306       if (addr != LLDB_INVALID_ADDRESS) {
307         if (sign[0] == '+')
308           return addr + offset;
309         return addr - offset;
310       }
311     } else if (register_value)
312       // In the case of register values, someone might just want to get the
313       // value in a language whose expression parser doesn't support registers.
314       return register_value.value();
315   }
316 
317   if (error_ptr)
318     *error_ptr = Status::FromErrorStringWithFormat(
319         "address expression \"%s\" evaluation failed", s.str().c_str());
320   return {};
321 }
322