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llvm-project/lldb/source/Interpreter/Args.cpp

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//===-- Args.cpp ------------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
#include <cstdlib>
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/DataFormatters/FormatManager.h"
#include "lldb/Host/OptionParser.h"
#include "lldb/Interpreter/Args.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Interpreter/Options.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/Stream.h"
#include "lldb/Utility/StreamString.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
using namespace lldb;
using namespace lldb_private;
// A helper function for argument parsing.
// Parses the initial part of the first argument using normal double quote
// rules:
// backslash escapes the double quote and itself. The parsed string is appended
// to the second
// argument. The function returns the unparsed portion of the string, starting
// at the closing
// quote.
static llvm::StringRef ParseDoubleQuotes(llvm::StringRef quoted,
std::string &result) {
// Inside double quotes, '\' and '"' are special.
static const char *k_escapable_characters = "\"\\";
while (true) {
// Skip over over regular characters and append them.
size_t regular = quoted.find_first_of(k_escapable_characters);
result += quoted.substr(0, regular);
quoted = quoted.substr(regular);
// If we have reached the end of string or the closing quote, we're done.
if (quoted.empty() || quoted.front() == '"')
break;
// We have found a backslash.
quoted = quoted.drop_front();
if (quoted.empty()) {
// A lone backslash at the end of string, let's just append it.
result += '\\';
break;
}
// If the character after the backslash is not a whitelisted escapable
// character, we
// leave the character sequence untouched.
if (strchr(k_escapable_characters, quoted.front()) == nullptr)
result += '\\';
result += quoted.front();
quoted = quoted.drop_front();
}
return quoted;
}
static size_t ArgvToArgc(const char **argv) {
if (!argv)
return 0;
size_t count = 0;
while (*argv++)
++count;
return count;
}
// A helper function for SetCommandString. Parses a single argument from the
// command string, processing quotes and backslashes in a shell-like manner.
// The function returns a tuple consisting of the parsed argument, the quote
// char used, and the unparsed portion of the string starting at the first
// unqouted, unescaped whitespace character.
static std::tuple<std::string, char, llvm::StringRef>
ParseSingleArgument(llvm::StringRef command) {
// Argument can be split into multiple discontiguous pieces, for example:
// "Hello ""World"
// this would result in a single argument "Hello World" (without the quotes)
// since the quotes would be removed and there is not space between the
// strings.
std::string arg;
// Since we can have multiple quotes that form a single command
// in a command like: "Hello "world'!' (which will make a single
// argument "Hello world!") we remember the first quote character
// we encounter and use that for the quote character.
char first_quote_char = '\0';
bool arg_complete = false;
do {
// Skip over over regular characters and append them.
size_t regular = command.find_first_of(" \t\"'`\\");
arg += command.substr(0, regular);
command = command.substr(regular);
if (command.empty())
break;
char special = command.front();
command = command.drop_front();
switch (special) {
case '\\':
if (command.empty()) {
arg += '\\';
break;
}
// If the character after the backslash is not a whitelisted escapable
// character, we
// leave the character sequence untouched.
if (strchr(" \t\\'\"`", command.front()) == nullptr)
arg += '\\';
arg += command.front();
command = command.drop_front();
break;
case ' ':
case '\t':
// We are not inside any quotes, we just found a space after an
// argument. We are done.
arg_complete = true;
break;
case '"':
case '\'':
case '`':
// We found the start of a quote scope.
if (first_quote_char == '\0')
first_quote_char = special;
if (special == '"')
command = ParseDoubleQuotes(command, arg);
else {
// For single quotes, we simply skip ahead to the matching quote
// character
// (or the end of the string).
size_t quoted = command.find(special);
arg += command.substr(0, quoted);
command = command.substr(quoted);
}
// If we found a closing quote, skip it.
if (!command.empty())
command = command.drop_front();
break;
}
} while (!arg_complete);
return std::make_tuple(arg, first_quote_char, command);
}
Args::ArgEntry::ArgEntry(llvm::StringRef str, char quote) : quote(quote) {
size_t size = str.size();
ptr.reset(new char[size + 1]);
::memcpy(data(), str.data() ? str.data() : "", size);
ptr[size] = 0;
ref = llvm::StringRef(c_str(), size);
}
//----------------------------------------------------------------------
// Args constructor
//----------------------------------------------------------------------
Args::Args(llvm::StringRef command) { SetCommandString(command); }
Args::Args(const Args &rhs) { *this = rhs; }
Args &Args::operator=(const Args &rhs) {
Clear();
m_argv.clear();
m_entries.clear();
for (auto &entry : rhs.m_entries) {
m_entries.emplace_back(entry.ref, entry.quote);
m_argv.push_back(m_entries.back().data());
}
m_argv.push_back(nullptr);
return *this;
}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
Args::~Args() {}
void Args::Dump(Stream &s, const char *label_name) const {
if (!label_name)
return;
int i = 0;
for (auto &entry : m_entries) {
s.Indent();
s.Format("{0}[{1}]=\"{2}\"\n", label_name, i++, entry.ref);
}
s.Format("{0}[{1}]=NULL\n", label_name, i);
s.EOL();
}
bool Args::GetCommandString(std::string &command) const {
command.clear();
for (size_t i = 0; i < m_entries.size(); ++i) {
if (i > 0)
command += ' ';
command += m_entries[i].ref;
}
return !m_entries.empty();
}
bool Args::GetQuotedCommandString(std::string &command) const {
command.clear();
for (size_t i = 0; i < m_entries.size(); ++i) {
if (i > 0)
command += ' ';
if (m_entries[i].quote) {
command += m_entries[i].quote;
command += m_entries[i].ref;
command += m_entries[i].quote;
} else {
command += m_entries[i].ref;
}
}
return !m_entries.empty();
}
void Args::SetCommandString(llvm::StringRef command) {
Clear();
m_argv.clear();
static const char *k_space_separators = " \t";
command = command.ltrim(k_space_separators);
std::string arg;
char quote;
while (!command.empty()) {
std::tie(arg, quote, command) = ParseSingleArgument(command);
m_entries.emplace_back(arg, quote);
m_argv.push_back(m_entries.back().data());
command = command.ltrim(k_space_separators);
}
m_argv.push_back(nullptr);
}
void Args::UpdateArgsAfterOptionParsing() {
assert(!m_argv.empty());
assert(m_argv.back() == nullptr);
// Now m_argv might be out of date with m_entries, so we need to fix that.
// This happens because getopt_long_only may permute the order of the
// arguments in argv, so we need to re-order the quotes and the refs array
// to match.
for (size_t i = 0; i < m_argv.size() - 1; ++i) {
const char *argv = m_argv[i];
auto pos =
std::find_if(m_entries.begin() + i, m_entries.end(),
[argv](const ArgEntry &D) { return D.c_str() == argv; });
assert(pos != m_entries.end());
size_t distance = std::distance(m_entries.begin(), pos);
if (i == distance)
continue;
assert(distance > i);
std::swap(m_entries[i], m_entries[distance]);
assert(m_entries[i].ref.data() == m_argv[i]);
}
m_entries.resize(m_argv.size() - 1);
}
size_t Args::GetArgumentCount() const { return m_entries.size(); }
const char *Args::GetArgumentAtIndex(size_t idx) const {
if (idx < m_argv.size())
return m_argv[idx];
return nullptr;
}
char Args::GetArgumentQuoteCharAtIndex(size_t idx) const {
if (idx < m_entries.size())
return m_entries[idx].quote;
return '\0';
}
char **Args::GetArgumentVector() {
assert(!m_argv.empty());
// TODO: functions like execve and posix_spawnp exhibit undefined behavior
// when argv or envp is null. So the code below is actually wrong. However,
// other code in LLDB depends on it being null. The code has been acting this
// way for some time, so it makes sense to leave it this way until someone
// has the time to come along and fix it.
return (m_argv.size() > 1) ? m_argv.data() : nullptr;
}
const char **Args::GetConstArgumentVector() const {
assert(!m_argv.empty());
return (m_argv.size() > 1) ? const_cast<const char **>(m_argv.data())
: nullptr;
}
void Args::Shift() {
// Don't pop the last NULL terminator from the argv array
if (m_entries.empty())
return;
m_argv.erase(m_argv.begin());
m_entries.erase(m_entries.begin());
}
void Args::Unshift(llvm::StringRef arg_str, char quote_char) {
InsertArgumentAtIndex(0, arg_str, quote_char);
}
void Args::AppendArguments(const Args &rhs) {
assert(m_argv.size() == m_entries.size() + 1);
assert(m_argv.back() == nullptr);
m_argv.pop_back();
for (auto &entry : rhs.m_entries) {
m_entries.emplace_back(entry.ref, entry.quote);
m_argv.push_back(m_entries.back().data());
}
m_argv.push_back(nullptr);
}
void Args::AppendArguments(const char **argv) {
size_t argc = ArgvToArgc(argv);
assert(m_argv.size() == m_entries.size() + 1);
assert(m_argv.back() == nullptr);
m_argv.pop_back();
for (auto arg : llvm::makeArrayRef(argv, argc)) {
m_entries.emplace_back(arg, '\0');
m_argv.push_back(m_entries.back().data());
}
m_argv.push_back(nullptr);
}
void Args::AppendArgument(llvm::StringRef arg_str, char quote_char) {
InsertArgumentAtIndex(GetArgumentCount(), arg_str, quote_char);
}
void Args::InsertArgumentAtIndex(size_t idx, llvm::StringRef arg_str,
char quote_char) {
assert(m_argv.size() == m_entries.size() + 1);
assert(m_argv.back() == nullptr);
if (idx > m_entries.size())
return;
m_entries.emplace(m_entries.begin() + idx, arg_str, quote_char);
m_argv.insert(m_argv.begin() + idx, m_entries[idx].data());
}
void Args::ReplaceArgumentAtIndex(size_t idx, llvm::StringRef arg_str,
char quote_char) {
assert(m_argv.size() == m_entries.size() + 1);
assert(m_argv.back() == nullptr);
if (idx >= m_entries.size())
return;
if (arg_str.size() > m_entries[idx].ref.size()) {
m_entries[idx] = ArgEntry(arg_str, quote_char);
m_argv[idx] = m_entries[idx].data();
} else {
const char *src_data = arg_str.data() ? arg_str.data() : "";
::memcpy(m_entries[idx].data(), src_data, arg_str.size());
m_entries[idx].ptr[arg_str.size()] = 0;
m_entries[idx].ref = m_entries[idx].ref.take_front(arg_str.size());
}
}
void Args::DeleteArgumentAtIndex(size_t idx) {
if (idx >= m_entries.size())
return;
m_argv.erase(m_argv.begin() + idx);
m_entries.erase(m_entries.begin() + idx);
}
void Args::SetArguments(size_t argc, const char **argv) {
Clear();
auto args = llvm::makeArrayRef(argv, argc);
m_entries.resize(argc);
m_argv.resize(argc + 1);
for (size_t i = 0; i < args.size(); ++i) {
char quote =
((args[i][0] == '\'') || (args[i][0] == '"') || (args[i][0] == '`'))
? args[i][0]
: '\0';
m_entries[i] = ArgEntry(args[i], quote);
m_argv[i] = m_entries[i].data();
}
}
void Args::SetArguments(const char **argv) {
SetArguments(ArgvToArgc(argv), argv);
}
Status Args::ParseOptions(Options &options, ExecutionContext *execution_context,
PlatformSP platform_sp, bool require_validation) {
StreamString sstr;
Status error;
Option *long_options = options.GetLongOptions();
if (long_options == nullptr) {
error.SetErrorStringWithFormat("invalid long options");
return error;
}
for (int i = 0; long_options[i].definition != nullptr; ++i) {
if (long_options[i].flag == nullptr) {
if (isprint8(long_options[i].val)) {
sstr << (char)long_options[i].val;
switch (long_options[i].definition->option_has_arg) {
default:
case OptionParser::eNoArgument:
break;
case OptionParser::eRequiredArgument:
sstr << ':';
break;
case OptionParser::eOptionalArgument:
sstr << "::";
break;
}
}
}
}
std::unique_lock<std::mutex> lock;
OptionParser::Prepare(lock);
int val;
while (1) {
int long_options_index = -1;
val = OptionParser::Parse(GetArgumentCount(), GetArgumentVector(),
sstr.GetString(), long_options,
&long_options_index);
if (val == -1)
break;
// Did we get an error?
if (val == '?') {
error.SetErrorStringWithFormat("unknown or ambiguous option");
break;
}
// The option auto-set itself
if (val == 0)
continue;
((Options *)&options)->OptionSeen(val);
// Lookup the long option index
if (long_options_index == -1) {
for (int i = 0; long_options[i].definition || long_options[i].flag ||
long_options[i].val;
++i) {
if (long_options[i].val == val) {
long_options_index = i;
break;
}
}
}
// Call the callback with the option
if (long_options_index >= 0 &&
long_options[long_options_index].definition) {
const OptionDefinition *def = long_options[long_options_index].definition;
if (!platform_sp) {
// User did not pass in an explicit platform. Try to grab
// from the execution context.
TargetSP target_sp =
execution_context ? execution_context->GetTargetSP() : TargetSP();
platform_sp = target_sp ? target_sp->GetPlatform() : PlatformSP();
}
OptionValidator *validator = def->validator;
if (!platform_sp && require_validation) {
// Caller requires validation but we cannot validate as we
// don't have the mandatory platform against which to
// validate.
error.SetErrorString("cannot validate options: "
"no platform available");
return error;
}
bool validation_failed = false;
if (platform_sp) {
// Ensure we have an execution context, empty or not.
ExecutionContext dummy_context;
ExecutionContext *exe_ctx_p =
execution_context ? execution_context : &dummy_context;
if (validator && !validator->IsValid(*platform_sp, *exe_ctx_p)) {
validation_failed = true;
error.SetErrorStringWithFormat("Option \"%s\" invalid. %s",
def->long_option,
def->validator->LongConditionString());
}
}
// As long as validation didn't fail, we set the option value.
if (!validation_failed)
error = options.SetOptionValue(
long_options_index,
(def->option_has_arg == OptionParser::eNoArgument)
? nullptr
: OptionParser::GetOptionArgument(),
execution_context);
} else {
error.SetErrorStringWithFormat("invalid option with value '%i'", val);
}
if (error.Fail())
break;
}
// Update our ARGV now that get options has consumed all the options
m_argv.erase(m_argv.begin(), m_argv.begin() + OptionParser::GetOptionIndex());
UpdateArgsAfterOptionParsing();
return error;
}
void Args::Clear() {
m_entries.clear();
m_argv.clear();
m_argv.push_back(nullptr);
}
lldb::addr_t Args::StringToAddress(const ExecutionContext *exe_ctx,
llvm::StringRef s, lldb::addr_t fail_value,
Status *error_ptr) {
bool error_set = false;
if (s.empty()) {
if (error_ptr)
error_ptr->SetErrorStringWithFormat("invalid address expression \"%s\"",
s.str().c_str());
return fail_value;
}
llvm::StringRef sref = s;
lldb::addr_t addr = LLDB_INVALID_ADDRESS;
if (!s.getAsInteger(0, addr)) {
if (error_ptr)
error_ptr->Clear();
return addr;
}
// Try base 16 with no prefix...
if (!s.getAsInteger(16, addr)) {
if (error_ptr)
error_ptr->Clear();
return addr;
}
Target *target = nullptr;
if (!exe_ctx || !(target = exe_ctx->GetTargetPtr())) {
if (error_ptr)
error_ptr->SetErrorStringWithFormat("invalid address expression \"%s\"",
s.str().c_str());
return fail_value;
}
lldb::ValueObjectSP valobj_sp;
EvaluateExpressionOptions options;
options.SetCoerceToId(false);
options.SetUnwindOnError(true);
options.SetKeepInMemory(false);
options.SetTryAllThreads(true);
ExpressionResults expr_result =
target->EvaluateExpression(s, exe_ctx->GetFramePtr(), valobj_sp, options);
bool success = false;
if (expr_result == eExpressionCompleted) {
if (valobj_sp)
valobj_sp = valobj_sp->GetQualifiedRepresentationIfAvailable(
valobj_sp->GetDynamicValueType(), true);
// Get the address to watch.
if (valobj_sp)
addr = valobj_sp->GetValueAsUnsigned(fail_value, &success);
if (success) {
if (error_ptr)
error_ptr->Clear();
return addr;
} else {
if (error_ptr) {
error_set = true;
error_ptr->SetErrorStringWithFormat(
"address expression \"%s\" resulted in a value whose type "
"can't be converted to an address: %s",
s.str().c_str(), valobj_sp->GetTypeName().GetCString());
}
}
} else {
// Since the compiler can't handle things like "main + 12" we should
// try to do this for now. The compiler doesn't like adding offsets
// to function pointer types.
static RegularExpression g_symbol_plus_offset_regex(
"^(.*)([-\\+])[[:space:]]*(0x[0-9A-Fa-f]+|[0-9]+)[[:space:]]*$");
RegularExpression::Match regex_match(3);
if (g_symbol_plus_offset_regex.Execute(sref, &regex_match)) {
uint64_t offset = 0;
bool add = true;
std::string name;
std::string str;
if (regex_match.GetMatchAtIndex(s, 1, name)) {
if (regex_match.GetMatchAtIndex(s, 2, str)) {
add = str[0] == '+';
if (regex_match.GetMatchAtIndex(s, 3, str)) {
if (!llvm::StringRef(str).getAsInteger(0, offset)) {
Status error;
addr = StringToAddress(exe_ctx, name.c_str(),
LLDB_INVALID_ADDRESS, &error);
if (addr != LLDB_INVALID_ADDRESS) {
if (add)
return addr + offset;
else
return addr - offset;
}
}
}
}
}
}
if (error_ptr) {
error_set = true;
error_ptr->SetErrorStringWithFormat(
"address expression \"%s\" evaluation failed", s.str().c_str());
}
}
if (error_ptr) {
if (!error_set)
error_ptr->SetErrorStringWithFormat("invalid address expression \"%s\"",
s.str().c_str());
}
return fail_value;
}
const char *Args::StripSpaces(std::string &s, bool leading, bool trailing,
bool return_null_if_empty) {
static const char *k_white_space = " \t\v";
if (!s.empty()) {
if (leading) {
size_t pos = s.find_first_not_of(k_white_space);
if (pos == std::string::npos)
s.clear();
else if (pos > 0)
s.erase(0, pos);
}
if (trailing) {
size_t rpos = s.find_last_not_of(k_white_space);
if (rpos != std::string::npos && rpos + 1 < s.size())
s.erase(rpos + 1);
}
}
if (return_null_if_empty && s.empty())
return nullptr;
return s.c_str();
}
bool Args::StringToBoolean(llvm::StringRef ref, bool fail_value,
bool *success_ptr) {
if (success_ptr)
*success_ptr = true;
ref = ref.trim();
if (ref.equals_lower("false") || ref.equals_lower("off") ||
ref.equals_lower("no") || ref.equals_lower("0")) {
return false;
} else if (ref.equals_lower("true") || ref.equals_lower("on") ||
ref.equals_lower("yes") || ref.equals_lower("1")) {
return true;
}
if (success_ptr)
*success_ptr = false;
return fail_value;
}
char Args::StringToChar(llvm::StringRef s, char fail_value, bool *success_ptr) {
if (success_ptr)
*success_ptr = false;
if (s.size() != 1)
return fail_value;
if (success_ptr)
*success_ptr = true;
return s[0];
}
bool Args::StringToVersion(llvm::StringRef string, uint32_t &major,
uint32_t &minor, uint32_t &update) {
major = UINT32_MAX;
minor = UINT32_MAX;
update = UINT32_MAX;
if (string.empty())
return false;
llvm::StringRef major_str, minor_str, update_str;
std::tie(major_str, minor_str) = string.split('.');
std::tie(minor_str, update_str) = minor_str.split('.');
if (major_str.getAsInteger(10, major))
return false;
if (!minor_str.empty() && minor_str.getAsInteger(10, minor))
return false;
if (!update_str.empty() && update_str.getAsInteger(10, update))
return false;
return true;
}
const char *Args::GetShellSafeArgument(const FileSpec &shell,
const char *unsafe_arg,
std::string &safe_arg) {
struct ShellDescriptor {
ConstString m_basename;
const char *m_escapables;
};
static ShellDescriptor g_Shells[] = {{ConstString("bash"), " '\"<>()&"},
{ConstString("tcsh"), " '\"<>()&$"},
{ConstString("sh"), " '\"<>()&"}};
// safe minimal set
const char *escapables = " '\"";
if (auto basename = shell.GetFilename()) {
for (const auto &Shell : g_Shells) {
if (Shell.m_basename == basename) {
escapables = Shell.m_escapables;
break;
}
}
}
safe_arg.assign(unsafe_arg);
size_t prev_pos = 0;
while (prev_pos < safe_arg.size()) {
// Escape spaces and quotes
size_t pos = safe_arg.find_first_of(escapables, prev_pos);
if (pos != std::string::npos) {
safe_arg.insert(pos, 1, '\\');
prev_pos = pos + 2;
} else
break;
}
return safe_arg.c_str();
}
int64_t Args::StringToOptionEnum(llvm::StringRef s,
OptionEnumValueElement *enum_values,
int32_t fail_value, Status &error) {
error.Clear();
if (!enum_values) {
error.SetErrorString("invalid enumeration argument");
return fail_value;
}
if (s.empty()) {
error.SetErrorString("empty enumeration string");
return fail_value;
}
for (int i = 0; enum_values[i].string_value != nullptr; i++) {
llvm::StringRef this_enum(enum_values[i].string_value);
if (this_enum.startswith(s))
return enum_values[i].value;
}
StreamString strm;
strm.PutCString("invalid enumeration value, valid values are: ");
for (int i = 0; enum_values[i].string_value != nullptr; i++) {
strm.Printf("%s\"%s\"", i > 0 ? ", " : "", enum_values[i].string_value);
}
error.SetErrorString(strm.GetString());
return fail_value;
}
lldb::ScriptLanguage
Args::StringToScriptLanguage(llvm::StringRef s, lldb::ScriptLanguage fail_value,
bool *success_ptr) {
if (success_ptr)
*success_ptr = true;
if (s.equals_lower("python"))
return eScriptLanguagePython;
if (s.equals_lower("default"))
return eScriptLanguageDefault;
if (s.equals_lower("none"))
return eScriptLanguageNone;
if (success_ptr)
*success_ptr = false;
return fail_value;
}
Status Args::StringToFormat(const char *s, lldb::Format &format,
size_t *byte_size_ptr) {
format = eFormatInvalid;
Status error;
if (s && s[0]) {
if (byte_size_ptr) {
if (isdigit(s[0])) {
char *format_char = nullptr;
unsigned long byte_size = ::strtoul(s, &format_char, 0);
if (byte_size != ULONG_MAX)
*byte_size_ptr = byte_size;
s = format_char;
} else
*byte_size_ptr = 0;
}
const bool partial_match_ok = true;
if (!FormatManager::GetFormatFromCString(s, partial_match_ok, format)) {
StreamString error_strm;
error_strm.Printf(
"Invalid format character or name '%s'. Valid values are:\n", s);
for (Format f = eFormatDefault; f < kNumFormats; f = Format(f + 1)) {
char format_char = FormatManager::GetFormatAsFormatChar(f);
if (format_char)
error_strm.Printf("'%c' or ", format_char);
error_strm.Printf("\"%s\"", FormatManager::GetFormatAsCString(f));
error_strm.EOL();
}
if (byte_size_ptr)
error_strm.PutCString(
"An optional byte size can precede the format character.\n");
error.SetErrorString(error_strm.GetString());
}
if (error.Fail())
return error;
} else {
error.SetErrorStringWithFormat("%s option string", s ? "empty" : "invalid");
}
return error;
}
lldb::Encoding Args::StringToEncoding(llvm::StringRef s,
lldb::Encoding fail_value) {
return llvm::StringSwitch<lldb::Encoding>(s)
.Case("uint", eEncodingUint)
.Case("sint", eEncodingSint)
.Case("ieee754", eEncodingIEEE754)
.Case("vector", eEncodingVector)
.Default(fail_value);
}
uint32_t Args::StringToGenericRegister(llvm::StringRef s) {
if (s.empty())
return LLDB_INVALID_REGNUM;
uint32_t result = llvm::StringSwitch<uint32_t>(s)
.Case("pc", LLDB_REGNUM_GENERIC_PC)
.Case("sp", LLDB_REGNUM_GENERIC_SP)
.Case("fp", LLDB_REGNUM_GENERIC_FP)
.Cases("ra", "lr", LLDB_REGNUM_GENERIC_RA)
.Case("flags", LLDB_REGNUM_GENERIC_FLAGS)
.Case("arg1", LLDB_REGNUM_GENERIC_ARG1)
.Case("arg2", LLDB_REGNUM_GENERIC_ARG2)
.Case("arg3", LLDB_REGNUM_GENERIC_ARG3)
.Case("arg4", LLDB_REGNUM_GENERIC_ARG4)
.Case("arg5", LLDB_REGNUM_GENERIC_ARG5)
.Case("arg6", LLDB_REGNUM_GENERIC_ARG6)
.Case("arg7", LLDB_REGNUM_GENERIC_ARG7)
.Case("arg8", LLDB_REGNUM_GENERIC_ARG8)
.Default(LLDB_INVALID_REGNUM);
return result;
}
void Args::AddOrReplaceEnvironmentVariable(llvm::StringRef env_var_name,
llvm::StringRef new_value) {
if (env_var_name.empty())
return;
// Build the new entry.
std::string var_string(env_var_name);
if (!new_value.empty()) {
var_string += "=";
var_string += new_value;
}
size_t index = 0;
if (ContainsEnvironmentVariable(env_var_name, &index)) {
ReplaceArgumentAtIndex(index, var_string);
return;
}
// We didn't find it. Append it instead.
AppendArgument(var_string);
}
bool Args::ContainsEnvironmentVariable(llvm::StringRef env_var_name,
size_t *argument_index) const {
// Validate args.
if (env_var_name.empty())
return false;
// Check each arg to see if it matches the env var name.
for (auto arg : llvm::enumerate(m_entries)) {
llvm::StringRef name, value;
std::tie(name, value) = arg.value().ref.split('=');
if (name != env_var_name)
continue;
if (argument_index)
*argument_index = arg.index();
return true;
}
// We didn't find a match.
return false;
}
size_t Args::FindArgumentIndexForOption(Option *long_options,
int long_options_index) const {
char short_buffer[3];
char long_buffer[255];
::snprintf(short_buffer, sizeof(short_buffer), "-%c",
long_options[long_options_index].val);
::snprintf(long_buffer, sizeof(long_buffer), "--%s",
long_options[long_options_index].definition->long_option);
for (auto entry : llvm::enumerate(m_entries)) {
if (entry.value().ref.startswith(short_buffer) ||
entry.value().ref.startswith(long_buffer))
return entry.index();
}
return size_t(-1);
}
bool Args::IsPositionalArgument(const char *arg) {
if (arg == nullptr)
return false;
bool is_positional = true;
const char *cptr = arg;
if (cptr[0] == '%') {
++cptr;
while (isdigit(cptr[0]))
++cptr;
if (cptr[0] != '\0')
is_positional = false;
} else
is_positional = false;
return is_positional;
}
std::string Args::ParseAliasOptions(Options &options,
CommandReturnObject &result,
OptionArgVector *option_arg_vector,
llvm::StringRef raw_input_string) {
std::string result_string(raw_input_string);
StreamString sstr;
int i;
Option *long_options = options.GetLongOptions();
if (long_options == nullptr) {
result.AppendError("invalid long options");
result.SetStatus(eReturnStatusFailed);
return result_string;
}
for (i = 0; long_options[i].definition != nullptr; ++i) {
if (long_options[i].flag == nullptr) {
sstr << (char)long_options[i].val;
switch (long_options[i].definition->option_has_arg) {
default:
case OptionParser::eNoArgument:
break;
case OptionParser::eRequiredArgument:
sstr << ":";
break;
case OptionParser::eOptionalArgument:
sstr << "::";
break;
}
}
}
std::unique_lock<std::mutex> lock;
OptionParser::Prepare(lock);
result.SetStatus(eReturnStatusSuccessFinishNoResult);
int val;
while (1) {
int long_options_index = -1;
val = OptionParser::Parse(GetArgumentCount(), GetArgumentVector(),
sstr.GetString(), long_options,
&long_options_index);
if (val == -1)
break;
if (val == '?') {
result.AppendError("unknown or ambiguous option");
result.SetStatus(eReturnStatusFailed);
break;
}
if (val == 0)
continue;
options.OptionSeen(val);
// Look up the long option index
if (long_options_index == -1) {
for (int j = 0; long_options[j].definition || long_options[j].flag ||
long_options[j].val;
++j) {
if (long_options[j].val == val) {
long_options_index = j;
break;
}
}
}
// See if the option takes an argument, and see if one was supplied.
if (long_options_index == -1) {
result.AppendErrorWithFormat("Invalid option with value '%c'.\n", val);
result.SetStatus(eReturnStatusFailed);
return result_string;
}
StreamString option_str;
option_str.Printf("-%c", val);
const OptionDefinition *def = long_options[long_options_index].definition;
int has_arg =
(def == nullptr) ? OptionParser::eNoArgument : def->option_has_arg;
const char *option_arg = nullptr;
switch (has_arg) {
case OptionParser::eRequiredArgument:
if (OptionParser::GetOptionArgument() == nullptr) {
result.AppendErrorWithFormat(
"Option '%s' is missing argument specifier.\n",
option_str.GetData());
result.SetStatus(eReturnStatusFailed);
return result_string;
}
LLVM_FALLTHROUGH;
case OptionParser::eOptionalArgument:
option_arg = OptionParser::GetOptionArgument();
LLVM_FALLTHROUGH;
case OptionParser::eNoArgument:
break;
default:
result.AppendErrorWithFormat("error with options table; invalid value "
"in has_arg field for option '%c'.\n",
val);
result.SetStatus(eReturnStatusFailed);
return result_string;
}
if (!option_arg)
option_arg = "<no-argument>";
option_arg_vector->emplace_back(option_str.GetString(), has_arg,
option_arg);
// Find option in the argument list; also see if it was supposed to take
// an argument and if one was supplied. Remove option (and argument, if
// given) from the argument list. Also remove them from the
// raw_input_string, if one was passed in.
size_t idx = FindArgumentIndexForOption(long_options, long_options_index);
if (idx == size_t(-1))
continue;
if (!result_string.empty()) {
auto tmp_arg = m_entries[idx].ref;
size_t pos = result_string.find(tmp_arg);
if (pos != std::string::npos)
result_string.erase(pos, tmp_arg.size());
}
ReplaceArgumentAtIndex(idx, llvm::StringRef());
if ((long_options[long_options_index].definition->option_has_arg !=
OptionParser::eNoArgument) &&
(OptionParser::GetOptionArgument() != nullptr) &&
(idx + 1 < GetArgumentCount()) &&
(m_entries[idx + 1].ref == OptionParser::GetOptionArgument())) {
if (result_string.size() > 0) {
auto tmp_arg = m_entries[idx + 1].ref;
size_t pos = result_string.find(tmp_arg);
if (pos != std::string::npos)
result_string.erase(pos, tmp_arg.size());
}
ReplaceArgumentAtIndex(idx + 1, llvm::StringRef());
}
}
return result_string;
}
void Args::ParseArgsForCompletion(Options &options,
OptionElementVector &option_element_vector,
uint32_t cursor_index) {
StreamString sstr;
Option *long_options = options.GetLongOptions();
option_element_vector.clear();
if (long_options == nullptr) {
return;
}
// Leading : tells getopt to return a : for a missing option argument AND
// to suppress error messages.
sstr << ":";
for (int i = 0; long_options[i].definition != nullptr; ++i) {
if (long_options[i].flag == nullptr) {
sstr << (char)long_options[i].val;
switch (long_options[i].definition->option_has_arg) {
default:
case OptionParser::eNoArgument:
break;
case OptionParser::eRequiredArgument:
sstr << ":";
break;
case OptionParser::eOptionalArgument:
sstr << "::";
break;
}
}
}
std::unique_lock<std::mutex> lock;
OptionParser::Prepare(lock);
OptionParser::EnableError(false);
int val;
auto opt_defs = options.GetDefinitions();
// Fooey... OptionParser::Parse permutes the GetArgumentVector to move the
// options to the front. So we have to build another Arg and pass that to
// OptionParser::Parse so it doesn't change the one we have.
std::vector<char *> dummy_vec = m_argv;
bool failed_once = false;
uint32_t dash_dash_pos = -1;
while (1) {
bool missing_argument = false;
int long_options_index = -1;
val = OptionParser::Parse(dummy_vec.size() - 1, &dummy_vec[0],
sstr.GetString(), long_options,
&long_options_index);
if (val == -1) {
// When we're completing a "--" which is the last option on line,
if (failed_once)
break;
failed_once = true;
// If this is a bare "--" we mark it as such so we can complete it
// successfully later.
// Handling the "--" is a little tricky, since that may mean end of
// options or arguments, or the
// user might want to complete options by long name. I make this work by
// checking whether the
// cursor is in the "--" argument, and if so I assume we're completing the
// long option, otherwise
// I let it pass to OptionParser::Parse which will terminate the option
// parsing.
// Note, in either case we continue parsing the line so we can figure out
// what other options
// were passed. This will be useful when we come to restricting
// completions based on what other
// options we've seen on the line.
if (static_cast<size_t>(OptionParser::GetOptionIndex()) <
dummy_vec.size() - 1 &&
(strcmp(dummy_vec[OptionParser::GetOptionIndex() - 1], "--") == 0)) {
dash_dash_pos = OptionParser::GetOptionIndex() - 1;
if (static_cast<size_t>(OptionParser::GetOptionIndex() - 1) ==
cursor_index) {
option_element_vector.push_back(
OptionArgElement(OptionArgElement::eBareDoubleDash,
OptionParser::GetOptionIndex() - 1,
OptionArgElement::eBareDoubleDash));
continue;
} else
break;
} else
break;
} else if (val == '?') {
option_element_vector.push_back(
OptionArgElement(OptionArgElement::eUnrecognizedArg,
OptionParser::GetOptionIndex() - 1,
OptionArgElement::eUnrecognizedArg));
continue;
} else if (val == 0) {
continue;
} else if (val == ':') {
// This is a missing argument.
val = OptionParser::GetOptionErrorCause();
missing_argument = true;
}
((Options *)&options)->OptionSeen(val);
// Look up the long option index
if (long_options_index == -1) {
for (int j = 0; long_options[j].definition || long_options[j].flag ||
long_options[j].val;
++j) {
if (long_options[j].val == val) {
long_options_index = j;
break;
}
}
}
// See if the option takes an argument, and see if one was supplied.
if (long_options_index >= 0) {
int opt_defs_index = -1;
for (size_t i = 0; i < opt_defs.size(); i++) {
if (opt_defs[i].short_option != val)
continue;
opt_defs_index = i;
break;
}
const OptionDefinition *def = long_options[long_options_index].definition;
int has_arg =
(def == nullptr) ? OptionParser::eNoArgument : def->option_has_arg;
switch (has_arg) {
case OptionParser::eNoArgument:
option_element_vector.push_back(OptionArgElement(
opt_defs_index, OptionParser::GetOptionIndex() - 1, 0));
break;
case OptionParser::eRequiredArgument:
if (OptionParser::GetOptionArgument() != nullptr) {
int arg_index;
if (missing_argument)
arg_index = -1;
else
arg_index = OptionParser::GetOptionIndex() - 1;
option_element_vector.push_back(OptionArgElement(
opt_defs_index, OptionParser::GetOptionIndex() - 2, arg_index));
} else {
option_element_vector.push_back(OptionArgElement(
opt_defs_index, OptionParser::GetOptionIndex() - 1, -1));
}
break;
case OptionParser::eOptionalArgument:
if (OptionParser::GetOptionArgument() != nullptr) {
option_element_vector.push_back(OptionArgElement(
opt_defs_index, OptionParser::GetOptionIndex() - 2,
OptionParser::GetOptionIndex() - 1));
} else {
option_element_vector.push_back(OptionArgElement(
opt_defs_index, OptionParser::GetOptionIndex() - 2,
OptionParser::GetOptionIndex() - 1));
}
break;
default:
// The options table is messed up. Here we'll just continue
option_element_vector.push_back(
OptionArgElement(OptionArgElement::eUnrecognizedArg,
OptionParser::GetOptionIndex() - 1,
OptionArgElement::eUnrecognizedArg));
break;
}
} else {
option_element_vector.push_back(
OptionArgElement(OptionArgElement::eUnrecognizedArg,
OptionParser::GetOptionIndex() - 1,
OptionArgElement::eUnrecognizedArg));
}
}
// Finally we have to handle the case where the cursor index points at a
// single "-". We want to mark that in
// the option_element_vector, but only if it is not after the "--". But it
// turns out that OptionParser::Parse just ignores
// an isolated "-". So we have to look it up by hand here. We only care if
// it is AT the cursor position.
// Note, a single quoted dash is not the same as a single dash...
const ArgEntry &cursor = m_entries[cursor_index];
if ((static_cast<int32_t>(dash_dash_pos) == -1 ||
cursor_index < dash_dash_pos) &&
cursor.quote == '\0' && cursor.ref == "-") {
option_element_vector.push_back(
OptionArgElement(OptionArgElement::eBareDash, cursor_index,
OptionArgElement::eBareDash));
}
}
void Args::EncodeEscapeSequences(const char *src, std::string &dst) {
dst.clear();
if (src) {
for (const char *p = src; *p != '\0'; ++p) {
size_t non_special_chars = ::strcspn(p, "\\");
if (non_special_chars > 0) {
dst.append(p, non_special_chars);
p += non_special_chars;
if (*p == '\0')
break;
}
if (*p == '\\') {
++p; // skip the slash
switch (*p) {
case 'a':
dst.append(1, '\a');
break;
case 'b':
dst.append(1, '\b');
break;
case 'f':
dst.append(1, '\f');
break;
case 'n':
dst.append(1, '\n');
break;
case 'r':
dst.append(1, '\r');
break;
case 't':
dst.append(1, '\t');
break;
case 'v':
dst.append(1, '\v');
break;
case '\\':
dst.append(1, '\\');
break;
case '\'':
dst.append(1, '\'');
break;
case '"':
dst.append(1, '"');
break;
case '0':
// 1 to 3 octal chars
{
// Make a string that can hold onto the initial zero char,
// up to 3 octal digits, and a terminating NULL.
char oct_str[5] = {'\0', '\0', '\0', '\0', '\0'};
int i;
for (i = 0; (p[i] >= '0' && p[i] <= '7') && i < 4; ++i)
oct_str[i] = p[i];
// We don't want to consume the last octal character since
// the main for loop will do this for us, so we advance p by
// one less than i (even if i is zero)
p += i - 1;
unsigned long octal_value = ::strtoul(oct_str, nullptr, 8);
if (octal_value <= UINT8_MAX) {
dst.append(1, (char)octal_value);
}
}
break;
case 'x':
// hex number in the format
if (isxdigit(p[1])) {
++p; // Skip the 'x'
// Make a string that can hold onto two hex chars plus a
// NULL terminator
char hex_str[3] = {*p, '\0', '\0'};
if (isxdigit(p[1])) {
++p; // Skip the first of the two hex chars
hex_str[1] = *p;
}
unsigned long hex_value = strtoul(hex_str, nullptr, 16);
if (hex_value <= UINT8_MAX)
dst.append(1, (char)hex_value);
} else {
dst.append(1, 'x');
}
break;
default:
// Just desensitize any other character by just printing what
// came after the '\'
dst.append(1, *p);
break;
}
}
}
}
}
void Args::ExpandEscapedCharacters(const char *src, std::string &dst) {
dst.clear();
if (src) {
for (const char *p = src; *p != '\0'; ++p) {
if (isprint8(*p))
dst.append(1, *p);
else {
switch (*p) {
case '\a':
dst.append("\\a");
break;
case '\b':
dst.append("\\b");
break;
case '\f':
dst.append("\\f");
break;
case '\n':
dst.append("\\n");
break;
case '\r':
dst.append("\\r");
break;
case '\t':
dst.append("\\t");
break;
case '\v':
dst.append("\\v");
break;
case '\'':
dst.append("\\'");
break;
case '"':
dst.append("\\\"");
break;
case '\\':
dst.append("\\\\");
break;
default: {
// Just encode as octal
dst.append("\\0");
char octal_str[32];
snprintf(octal_str, sizeof(octal_str), "%o", *p);
dst.append(octal_str);
} break;
}
}
}
}
}
std::string Args::EscapeLLDBCommandArgument(const std::string &arg,
char quote_char) {
const char *chars_to_escape = nullptr;
switch (quote_char) {
case '\0':
chars_to_escape = " \t\\'\"`";
break;
case '\'':
chars_to_escape = "";
break;
case '"':
chars_to_escape = "$\"`\\";
break;
default:
assert(false && "Unhandled quote character");
}
std::string res;
res.reserve(arg.size());
for (char c : arg) {
if (::strchr(chars_to_escape, c))
res.push_back('\\');
res.push_back(c);
}
return res;
}
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