| // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/flags/flags.h" |
| |
| #include <cctype> |
| #include <cerrno> |
| #include <cinttypes> |
| #include <cstdlib> |
| #include <cstring> |
| #include <sstream> |
| |
| #include "src/base/functional.h" |
| #include "src/base/logging.h" |
| #include "src/base/platform/platform.h" |
| #include "src/codegen/cpu-features.h" |
| #include "src/logging/counters.h" |
| #include "src/utils/allocation.h" |
| #include "src/utils/memcopy.h" |
| #include "src/utils/ostreams.h" |
| #include "src/utils/utils.h" |
| #include "src/wasm/wasm-limits.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Define all of our flags. |
| #define FLAG_MODE_DEFINE |
| #include "src/flags/flag-definitions.h" // NOLINT(build/include) |
| |
| // Define all of our flags default values. |
| #define FLAG_MODE_DEFINE_DEFAULTS |
| #include "src/flags/flag-definitions.h" // NOLINT(build/include) |
| |
| namespace { |
| |
| struct Flag; |
| Flag* FindFlagByPointer(const void* ptr); |
| Flag* FindFlagByName(const char* name); |
| |
| // This structure represents a single entry in the flag system, with a pointer |
| // to the actual flag, default value, comment, etc. This is designed to be POD |
| // initialized as to avoid requiring static constructors. |
| struct Flag { |
| enum FlagType { |
| TYPE_BOOL, |
| TYPE_MAYBE_BOOL, |
| TYPE_INT, |
| TYPE_UINT, |
| TYPE_UINT64, |
| TYPE_FLOAT, |
| TYPE_SIZE_T, |
| TYPE_STRING, |
| }; |
| |
| enum class SetBy { kDefault, kWeakImplication, kImplication, kCommandLine }; |
| |
| FlagType type_; // What type of flag, bool, int, or string. |
| const char* name_; // Name of the flag, ex "my_flag". |
| void* valptr_; // Pointer to the global flag variable. |
| const void* defptr_; // Pointer to the default value. |
| const char* cmt_; // A comment about the flags purpose. |
| bool owns_ptr_; // Does the flag own its string value? |
| SetBy set_by_ = SetBy::kDefault; |
| const char* implied_by_ = nullptr; |
| |
| FlagType type() const { return type_; } |
| |
| const char* name() const { return name_; } |
| |
| const char* comment() const { return cmt_; } |
| |
| bool PointsTo(const void* ptr) const { return valptr_ == ptr; } |
| |
| bool bool_variable() const { |
| DCHECK(type_ == TYPE_BOOL); |
| return *reinterpret_cast<bool*>(valptr_); |
| } |
| |
| void set_bool_variable(bool value, SetBy set_by) { |
| DCHECK(type_ == TYPE_BOOL); |
| bool change_flag = *reinterpret_cast<bool*>(valptr_) != value; |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) *reinterpret_cast<bool*>(valptr_) = value; |
| } |
| |
| MaybeBoolFlag maybe_bool_variable() const { |
| DCHECK(type_ == TYPE_MAYBE_BOOL); |
| return *reinterpret_cast<MaybeBoolFlag*>(valptr_); |
| } |
| |
| void set_maybe_bool_variable(MaybeBoolFlag value, SetBy set_by) { |
| DCHECK(type_ == TYPE_MAYBE_BOOL); |
| bool change_flag = *reinterpret_cast<MaybeBoolFlag*>(valptr_) != value; |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) *reinterpret_cast<MaybeBoolFlag*>(valptr_) = value; |
| } |
| |
| int int_variable() const { |
| DCHECK(type_ == TYPE_INT); |
| return *reinterpret_cast<int*>(valptr_); |
| } |
| |
| void set_int_variable(int value, SetBy set_by) { |
| DCHECK(type_ == TYPE_INT); |
| bool change_flag = *reinterpret_cast<int*>(valptr_) != value; |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) *reinterpret_cast<int*>(valptr_) = value; |
| } |
| |
| unsigned int uint_variable() const { |
| DCHECK(type_ == TYPE_UINT); |
| return *reinterpret_cast<unsigned int*>(valptr_); |
| } |
| |
| void set_uint_variable(unsigned int value, SetBy set_by) { |
| DCHECK(type_ == TYPE_UINT); |
| bool change_flag = *reinterpret_cast<unsigned int*>(valptr_) != value; |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) *reinterpret_cast<unsigned int*>(valptr_) = value; |
| } |
| |
| uint64_t uint64_variable() const { |
| DCHECK(type_ == TYPE_UINT64); |
| return *reinterpret_cast<uint64_t*>(valptr_); |
| } |
| |
| void set_uint64_variable(uint64_t value, SetBy set_by) { |
| DCHECK(type_ == TYPE_UINT64); |
| bool change_flag = *reinterpret_cast<uint64_t*>(valptr_) != value; |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) *reinterpret_cast<uint64_t*>(valptr_) = value; |
| } |
| |
| double float_variable() const { |
| DCHECK(type_ == TYPE_FLOAT); |
| return *reinterpret_cast<double*>(valptr_); |
| } |
| |
| void set_float_variable(double value, SetBy set_by) { |
| DCHECK(type_ == TYPE_FLOAT); |
| bool change_flag = *reinterpret_cast<double*>(valptr_) != value; |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) *reinterpret_cast<double*>(valptr_) = value; |
| } |
| |
| size_t size_t_variable() const { |
| DCHECK(type_ == TYPE_SIZE_T); |
| return *reinterpret_cast<size_t*>(valptr_); |
| } |
| |
| void set_size_t_variable(size_t value, SetBy set_by) { |
| DCHECK(type_ == TYPE_SIZE_T); |
| bool change_flag = *reinterpret_cast<size_t*>(valptr_) != value; |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) *reinterpret_cast<size_t*>(valptr_) = value; |
| } |
| |
| const char* string_value() const { |
| DCHECK(type_ == TYPE_STRING); |
| return *reinterpret_cast<const char**>(valptr_); |
| } |
| |
| void set_string_value(const char* value, bool owns_ptr, SetBy set_by) { |
| DCHECK(type_ == TYPE_STRING); |
| const char** ptr = reinterpret_cast<const char**>(valptr_); |
| bool change_flag = (*ptr == nullptr) != (value == nullptr) || |
| (*ptr && value && std::strcmp(*ptr, value) != 0); |
| change_flag = CheckFlagChange(set_by, change_flag); |
| if (change_flag) { |
| if (owns_ptr_ && *ptr != nullptr) DeleteArray(*ptr); |
| *ptr = value; |
| owns_ptr_ = owns_ptr; |
| } else { |
| if (owns_ptr && value != nullptr) DeleteArray(value); |
| } |
| } |
| |
| bool bool_default() const { |
| DCHECK(type_ == TYPE_BOOL); |
| return *reinterpret_cast<const bool*>(defptr_); |
| } |
| |
| int int_default() const { |
| DCHECK(type_ == TYPE_INT); |
| return *reinterpret_cast<const int*>(defptr_); |
| } |
| |
| unsigned int uint_default() const { |
| DCHECK(type_ == TYPE_UINT); |
| return *reinterpret_cast<const unsigned int*>(defptr_); |
| } |
| |
| uint64_t uint64_default() const { |
| DCHECK(type_ == TYPE_UINT64); |
| return *reinterpret_cast<const uint64_t*>(defptr_); |
| } |
| |
| double float_default() const { |
| DCHECK(type_ == TYPE_FLOAT); |
| return *reinterpret_cast<const double*>(defptr_); |
| } |
| |
| size_t size_t_default() const { |
| DCHECK(type_ == TYPE_SIZE_T); |
| return *reinterpret_cast<const size_t*>(defptr_); |
| } |
| |
| const char* string_default() const { |
| DCHECK(type_ == TYPE_STRING); |
| return *reinterpret_cast<const char* const*>(defptr_); |
| } |
| |
| static bool ShouldCheckFlagContradictions() { |
| if (FLAG_allow_overwriting_for_next_flag) { |
| // Setting the flag manually to false before calling Reset() avoids this |
| // becoming re-entrant. |
| FLAG_allow_overwriting_for_next_flag = false; |
| FindFlagByPointer(&FLAG_allow_overwriting_for_next_flag)->Reset(); |
| return false; |
| } |
| return FLAG_abort_on_contradictory_flags && !FLAG_fuzzing; |
| } |
| |
| // {change_flag} indicates if we're going to change the flag value. |
| // Returns an updated value for {change_flag}, which is changed to false if a |
| // weak implication is being ignored beause a flag is already set by a normal |
| // implication or from the command-line. |
| bool CheckFlagChange(SetBy new_set_by, bool change_flag, |
| const char* implied_by = nullptr) { |
| if (new_set_by == SetBy::kWeakImplication && |
| (set_by_ == SetBy::kImplication || set_by_ == SetBy::kCommandLine)) { |
| return false; |
| } |
| if (ShouldCheckFlagContradictions()) { |
| // For bool flags, we only check for a conflict if the value actually |
| // changes. So specifying the same flag with the same value multiple times |
| // is allowed. |
| // For other flags, we disallow specifying them explicitly or in the |
| // presence of an implication even if the value is the same. |
| // This is to simplify the rules describing conflicts in variants.py: A |
| // repeated non-boolean flag is considered an error independently of its |
| // value. |
| bool is_bool_flag = type_ == TYPE_MAYBE_BOOL || type_ == TYPE_BOOL; |
| bool check_implications = change_flag; |
| bool check_command_line_flags = change_flag || !is_bool_flag; |
| const char* hint = |
| "To fix this, it might be necessary to specify additional " |
| "contradictory flags in tools/testrunner/local/variants.py."; |
| switch (set_by_) { |
| case SetBy::kDefault: |
| break; |
| case SetBy::kWeakImplication: |
| if (new_set_by == SetBy::kWeakImplication && check_implications) { |
| FATAL( |
| "Contradictory weak flag implications from --%s and --%s for " |
| "flag %s\n%s", |
| implied_by_, implied_by, name(), hint); |
| } |
| break; |
| case SetBy::kImplication: |
| if (new_set_by == SetBy::kImplication && check_implications) { |
| FATAL( |
| "Contradictory flag implications from --%s and --%s for flag " |
| "%s\n%s", |
| implied_by_, implied_by, name(), hint); |
| } |
| break; |
| case SetBy::kCommandLine: |
| if (new_set_by == SetBy::kImplication && check_command_line_flags) { |
| FATAL( |
| "Flag --%s is implied by --%s but also specified " |
| "explicitly.\n%s", |
| name(), implied_by, hint); |
| } else if (new_set_by == SetBy::kCommandLine && |
| check_command_line_flags) { |
| if (is_bool_flag) { |
| FATAL( |
| "Command-line provided flag --%s specified as both true and " |
| "false.\n%s", |
| name(), hint); |
| } else { |
| FATAL( |
| "Command-line provided flag --%s specified multiple " |
| "times.\n%s", |
| name(), hint); |
| } |
| } |
| break; |
| } |
| } |
| set_by_ = new_set_by; |
| if (new_set_by == SetBy::kImplication || |
| new_set_by == SetBy::kWeakImplication) { |
| DCHECK_NOT_NULL(implied_by); |
| implied_by_ = implied_by; |
| } |
| return change_flag; |
| } |
| |
| // Compare this flag's current value against the default. |
| bool IsDefault() const { |
| switch (type_) { |
| case TYPE_BOOL: |
| return bool_variable() == bool_default(); |
| case TYPE_MAYBE_BOOL: |
| return maybe_bool_variable().has_value == false; |
| case TYPE_INT: |
| return int_variable() == int_default(); |
| case TYPE_UINT: |
| return uint_variable() == uint_default(); |
| case TYPE_UINT64: |
| return uint64_variable() == uint64_default(); |
| case TYPE_FLOAT: |
| return float_variable() == float_default(); |
| case TYPE_SIZE_T: |
| return size_t_variable() == size_t_default(); |
| case TYPE_STRING: { |
| const char* str1 = string_value(); |
| const char* str2 = string_default(); |
| if (str2 == nullptr) return str1 == nullptr; |
| if (str1 == nullptr) return str2 == nullptr; |
| return strcmp(str1, str2) == 0; |
| } |
| } |
| UNREACHABLE(); |
| } |
| |
| // Set a flag back to it's default value. |
| void Reset() { |
| switch (type_) { |
| case TYPE_BOOL: |
| set_bool_variable(bool_default(), SetBy::kDefault); |
| break; |
| case TYPE_MAYBE_BOOL: |
| set_maybe_bool_variable(MaybeBoolFlag::Create(false, false), |
| SetBy::kDefault); |
| break; |
| case TYPE_INT: |
| set_int_variable(int_default(), SetBy::kDefault); |
| break; |
| case TYPE_UINT: |
| set_uint_variable(uint_default(), SetBy::kDefault); |
| break; |
| case TYPE_UINT64: |
| set_uint64_variable(uint64_default(), SetBy::kDefault); |
| break; |
| case TYPE_FLOAT: |
| set_float_variable(float_default(), SetBy::kDefault); |
| break; |
| case TYPE_SIZE_T: |
| set_size_t_variable(size_t_default(), SetBy::kDefault); |
| break; |
| case TYPE_STRING: |
| set_string_value(string_default(), false, SetBy::kDefault); |
| break; |
| } |
| } |
| |
| void AllowOverwriting() { set_by_ = SetBy::kDefault; } |
| }; |
| |
| Flag flags[] = { |
| #define FLAG_MODE_META |
| #include "src/flags/flag-definitions.h" // NOLINT(build/include) |
| }; |
| |
| const size_t num_flags = sizeof(flags) / sizeof(*flags); |
| |
| inline char NormalizeChar(char ch) { return ch == '_' ? '-' : ch; } |
| |
| bool EqualNames(const char* a, const char* b) { |
| for (int i = 0; NormalizeChar(a[i]) == NormalizeChar(b[i]); i++) { |
| if (a[i] == '\0') { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| Flag* FindFlagByName(const char* name) { |
| for (size_t i = 0; i < num_flags; ++i) { |
| if (EqualNames(name, flags[i].name())) return &flags[i]; |
| } |
| return nullptr; |
| } |
| |
| Flag* FindFlagByPointer(const void* ptr) { |
| for (size_t i = 0; i < num_flags; ++i) { |
| if (flags[i].PointsTo(ptr)) return &flags[i]; |
| } |
| return nullptr; |
| } |
| |
| } // namespace |
| |
| static const char* Type2String(Flag::FlagType type) { |
| switch (type) { |
| case Flag::TYPE_BOOL: |
| return "bool"; |
| case Flag::TYPE_MAYBE_BOOL: |
| return "maybe_bool"; |
| case Flag::TYPE_INT: |
| return "int"; |
| case Flag::TYPE_UINT: |
| return "uint"; |
| case Flag::TYPE_UINT64: |
| return "uint64"; |
| case Flag::TYPE_FLOAT: |
| return "float"; |
| case Flag::TYPE_SIZE_T: |
| return "size_t"; |
| case Flag::TYPE_STRING: |
| return "string"; |
| } |
| UNREACHABLE(); |
| } |
| |
| std::ostream& operator<<(std::ostream& os, const Flag& flag) { // NOLINT |
| switch (flag.type()) { |
| case Flag::TYPE_BOOL: |
| os << (flag.bool_variable() ? "true" : "false"); |
| break; |
| case Flag::TYPE_MAYBE_BOOL: |
| os << (flag.maybe_bool_variable().has_value |
| ? (flag.maybe_bool_variable().value ? "true" : "false") |
| : "unset"); |
| break; |
| case Flag::TYPE_INT: |
| os << flag.int_variable(); |
| break; |
| case Flag::TYPE_UINT: |
| os << flag.uint_variable(); |
| break; |
| case Flag::TYPE_UINT64: |
| os << flag.uint64_variable(); |
| break; |
| case Flag::TYPE_FLOAT: |
| os << flag.float_variable(); |
| break; |
| case Flag::TYPE_SIZE_T: |
| os << flag.size_t_variable(); |
| break; |
| case Flag::TYPE_STRING: { |
| const char* str = flag.string_value(); |
| os << (str ? str : "nullptr"); |
| break; |
| } |
| } |
| return os; |
| } |
| |
| // static |
| std::vector<const char*>* FlagList::argv() { |
| std::vector<const char*>* args = new std::vector<const char*>(8); |
| for (size_t i = 0; i < num_flags; ++i) { |
| Flag* f = &flags[i]; |
| if (!f->IsDefault()) { |
| { |
| bool disabled = f->type() == Flag::TYPE_BOOL && !f->bool_variable(); |
| std::ostringstream os; |
| os << (disabled ? "--no" : "--") << f->name(); |
| args->push_back(StrDup(os.str().c_str())); |
| } |
| if (f->type() != Flag::TYPE_BOOL) { |
| std::ostringstream os; |
| os << *f; |
| args->push_back(StrDup(os.str().c_str())); |
| } |
| } |
| } |
| return args; |
| } |
| |
| // Helper function to parse flags: Takes an argument arg and splits it into |
| // a flag name and flag value (or nullptr if they are missing). negated is set |
| // if the arg started with "-no" or "--no". The buffer may be used to NUL- |
| // terminate the name, it must be large enough to hold any possible name. |
| static void SplitArgument(const char* arg, char* buffer, int buffer_size, |
| const char** name, const char** value, |
| bool* negated) { |
| *name = nullptr; |
| *value = nullptr; |
| *negated = false; |
| |
| if (arg != nullptr && *arg == '-') { |
| // find the begin of the flag name |
| arg++; // remove 1st '-' |
| if (*arg == '-') { |
| arg++; // remove 2nd '-' |
| DCHECK_NE('\0', arg[0]); // '--' arguments are handled in the caller. |
| } |
| if (arg[0] == 'n' && arg[1] == 'o') { |
| arg += 2; // remove "no" |
| if (NormalizeChar(arg[0]) == '-') arg++; // remove dash after "no". |
| *negated = true; |
| } |
| *name = arg; |
| |
| // find the end of the flag name |
| while (*arg != '\0' && *arg != '=') arg++; |
| |
| // get the value if any |
| if (*arg == '=') { |
| // make a copy so we can NUL-terminate flag name |
| size_t n = arg - *name; |
| CHECK(n < static_cast<size_t>(buffer_size)); // buffer is too small |
| MemCopy(buffer, *name, n); |
| buffer[n] = '\0'; |
| *name = buffer; |
| // get the value |
| *value = arg + 1; |
| } |
| } |
| } |
| |
| template <typename T> |
| bool TryParseUnsigned(Flag* flag, const char* arg, const char* value, |
| char** endp, T* out_val) { |
| // We do not use strtoul because it accepts negative numbers. |
| // Rejects values >= 2**63 when T is 64 bits wide but that |
| // seems like an acceptable trade-off. |
| uint64_t max = static_cast<uint64_t>(std::numeric_limits<T>::max()); |
| errno = 0; |
| int64_t val = static_cast<int64_t>(strtoll(value, endp, 10)); |
| if (val < 0 || static_cast<uint64_t>(val) > max || errno != 0) { |
| PrintF(stderr, |
| "Error: Value for flag %s of type %s is out of bounds " |
| "[0-%" PRIu64 "]\n", |
| arg, Type2String(flag->type()), max); |
| return false; |
| } |
| *out_val = static_cast<T>(val); |
| return true; |
| } |
| |
| // static |
| int FlagList::SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags, |
| HelpOptions help_options) { |
| int return_code = 0; |
| // parse arguments |
| for (int i = 1; i < *argc;) { |
| int j = i; // j > 0 |
| const char* arg = argv[i++]; |
| |
| // split arg into flag components |
| char buffer[1 * KB]; |
| const char* name; |
| const char* value; |
| bool negated; |
| SplitArgument(arg, buffer, sizeof buffer, &name, &value, &negated); |
| |
| if (name != nullptr) { |
| // lookup the flag |
| Flag* flag = FindFlagByName(name); |
| if (flag == nullptr) { |
| if (remove_flags) { |
| // We don't recognize this flag but since we're removing |
| // the flags we recognize we assume that the remaining flags |
| // will be processed somewhere else so this flag might make |
| // sense there. |
| continue; |
| } else { |
| PrintF(stderr, "Error: unrecognized flag %s\n", arg); |
| return_code = j; |
| break; |
| } |
| } |
| |
| // if we still need a flag value, use the next argument if available |
| if (flag->type() != Flag::TYPE_BOOL && |
| flag->type() != Flag::TYPE_MAYBE_BOOL && value == nullptr) { |
| if (i < *argc) { |
| value = argv[i++]; |
| } |
| if (!value) { |
| PrintF(stderr, "Error: missing value for flag %s of type %s\n", arg, |
| Type2String(flag->type())); |
| return_code = j; |
| break; |
| } |
| } |
| |
| // set the flag |
| char* endp = const_cast<char*>(""); // *endp is only read |
| switch (flag->type()) { |
| case Flag::TYPE_BOOL: |
| flag->set_bool_variable(!negated, Flag::SetBy::kCommandLine); |
| break; |
| case Flag::TYPE_MAYBE_BOOL: |
| flag->set_maybe_bool_variable(MaybeBoolFlag::Create(true, !negated), |
| Flag::SetBy::kCommandLine); |
| break; |
| case Flag::TYPE_INT: |
| flag->set_int_variable(static_cast<int>(strtol(value, &endp, 10)), |
| Flag::SetBy::kCommandLine); |
| break; |
| case Flag::TYPE_UINT: { |
| unsigned int parsed_value; |
| if (TryParseUnsigned(flag, arg, value, &endp, &parsed_value)) { |
| flag->set_uint_variable(parsed_value, Flag::SetBy::kCommandLine); |
| } else { |
| return_code = j; |
| } |
| break; |
| } |
| case Flag::TYPE_UINT64: { |
| uint64_t parsed_value; |
| if (TryParseUnsigned(flag, arg, value, &endp, &parsed_value)) { |
| flag->set_uint64_variable(parsed_value, Flag::SetBy::kCommandLine); |
| } else { |
| return_code = j; |
| } |
| break; |
| } |
| case Flag::TYPE_FLOAT: |
| flag->set_float_variable(strtod(value, &endp), |
| Flag::SetBy::kCommandLine); |
| break; |
| case Flag::TYPE_SIZE_T: { |
| size_t parsed_value; |
| if (TryParseUnsigned(flag, arg, value, &endp, &parsed_value)) { |
| flag->set_size_t_variable(parsed_value, Flag::SetBy::kCommandLine); |
| } else { |
| return_code = j; |
| } |
| break; |
| } |
| case Flag::TYPE_STRING: |
| flag->set_string_value(value ? StrDup(value) : nullptr, true, |
| Flag::SetBy::kCommandLine); |
| break; |
| } |
| |
| // handle errors |
| bool is_bool_type = flag->type() == Flag::TYPE_BOOL || |
| flag->type() == Flag::TYPE_MAYBE_BOOL; |
| if ((is_bool_type && value != nullptr) || (!is_bool_type && negated) || |
| *endp != '\0') { |
| // TODO(neis): TryParseUnsigned may return with {*endp == '\0'} even in |
| // an error case. |
| PrintF(stderr, "Error: illegal value for flag %s of type %s\n", arg, |
| Type2String(flag->type())); |
| if (is_bool_type) { |
| PrintF(stderr, |
| "To set or unset a boolean flag, use --flag or --no-flag.\n"); |
| } |
| return_code = j; |
| break; |
| } |
| |
| // remove the flag & value from the command |
| if (remove_flags) { |
| while (j < i) { |
| argv[j++] = nullptr; |
| } |
| } |
| } |
| } |
| |
| if (FLAG_help) { |
| if (help_options.HasUsage()) { |
| PrintF(stdout, "%s", help_options.usage()); |
| } |
| PrintHelp(); |
| if (help_options.ShouldExit()) { |
| exit(0); |
| } |
| } |
| |
| if (remove_flags) { |
| // shrink the argument list |
| int j = 1; |
| for (int i = 1; i < *argc; i++) { |
| if (argv[i] != nullptr) argv[j++] = argv[i]; |
| } |
| *argc = j; |
| } else if (return_code != 0) { |
| if (return_code + 1 < *argc) { |
| PrintF(stderr, "The remaining arguments were ignored:"); |
| for (int i = return_code + 1; i < *argc; ++i) { |
| PrintF(stderr, " %s", argv[i]); |
| } |
| PrintF(stderr, "\n"); |
| } |
| } |
| if (return_code != 0) PrintF(stderr, "Try --help for options\n"); |
| |
| return return_code; |
| } |
| |
| static char* SkipWhiteSpace(char* p) { |
| while (*p != '\0' && isspace(*p) != 0) p++; |
| return p; |
| } |
| |
| static char* SkipBlackSpace(char* p) { |
| while (*p != '\0' && isspace(*p) == 0) p++; |
| return p; |
| } |
| |
| // static |
| int FlagList::SetFlagsFromString(const char* str, size_t len) { |
| // make a 0-terminated copy of str |
| std::unique_ptr<char[]> copy0{NewArray<char>(len + 1)}; |
| MemCopy(copy0.get(), str, len); |
| copy0[len] = '\0'; |
| |
| // strip leading white space |
| char* copy = SkipWhiteSpace(copy0.get()); |
| |
| // count the number of 'arguments' |
| int argc = 1; // be compatible with SetFlagsFromCommandLine() |
| for (char* p = copy; *p != '\0'; argc++) { |
| p = SkipBlackSpace(p); |
| p = SkipWhiteSpace(p); |
| } |
| |
| // allocate argument array |
| ScopedVector<char*> argv(argc); |
| |
| // split the flags string into arguments |
| argc = 1; // be compatible with SetFlagsFromCommandLine() |
| for (char* p = copy; *p != '\0'; argc++) { |
| argv[argc] = p; |
| p = SkipBlackSpace(p); |
| if (*p != '\0') *p++ = '\0'; // 0-terminate argument |
| p = SkipWhiteSpace(p); |
| } |
| |
| return SetFlagsFromCommandLine(&argc, argv.begin(), false); |
| } |
| |
| // static |
| void FlagList::ResetAllFlags() { |
| for (size_t i = 0; i < num_flags; ++i) { |
| flags[i].Reset(); |
| } |
| } |
| |
| // static |
| void FlagList::PrintHelp() { |
| CpuFeatures::Probe(false); |
| CpuFeatures::PrintTarget(); |
| CpuFeatures::PrintFeatures(); |
| |
| StdoutStream os; |
| os << "The following syntax for options is accepted (both '-' and '--' are " |
| "ok):\n" |
| " --flag (bool flags only)\n" |
| " --no-flag (bool flags only)\n" |
| " --flag=value (non-bool flags only, no spaces around '=')\n" |
| " --flag value (non-bool flags only)\n" |
| " -- (captures all remaining args in JavaScript)\n\n"; |
| os << "Options:\n"; |
| |
| for (const Flag& f : flags) { |
| os << " --"; |
| for (const char* c = f.name(); *c != '\0'; ++c) { |
| os << NormalizeChar(*c); |
| } |
| os << " (" << f.comment() << ")\n" |
| << " type: " << Type2String(f.type()) << " default: " << f |
| << "\n"; |
| } |
| } |
| |
| namespace { |
| |
| static uint32_t flag_hash = 0; |
| |
| void ComputeFlagListHash() { |
| std::ostringstream modified_args_as_string; |
| if (COMPRESS_POINTERS_BOOL) { |
| modified_args_as_string << "ptr-compr"; |
| } |
| if (DEBUG_BOOL) { |
| modified_args_as_string << "debug"; |
| } |
| for (size_t i = 0; i < num_flags; ++i) { |
| Flag* current = &flags[i]; |
| if (current->PointsTo(&FLAG_profile_deserialization)) { |
| // We want to be able to flip --profile-deserialization without |
| // causing the code cache to get invalidated by this hash. |
| continue; |
| } |
| if (!current->IsDefault()) { |
| modified_args_as_string << i; |
| modified_args_as_string << *current; |
| } |
| } |
| std::string args(modified_args_as_string.str()); |
| flag_hash = static_cast<uint32_t>( |
| base::hash_range(args.c_str(), args.c_str() + args.length())); |
| } |
| |
| template <class A, class B> |
| bool TriggerImplication(bool premise, const char* premise_name, |
| A* conclusion_pointer, B value, bool weak_implication) { |
| if (!premise) return false; |
| bool change_flag = *conclusion_pointer != implicit_cast<A>(value); |
| Flag* conclusion_flag = FindFlagByPointer(conclusion_pointer); |
| change_flag = conclusion_flag->CheckFlagChange( |
| weak_implication ? Flag::SetBy::kWeakImplication |
| : Flag::SetBy::kImplication, |
| change_flag, premise_name); |
| if (change_flag) *conclusion_pointer = value; |
| return change_flag; |
| } |
| |
| } // namespace |
| |
| // static |
| void FlagList::EnforceFlagImplications() { |
| bool changed; |
| do { |
| changed = false; |
| #define FLAG_MODE_DEFINE_IMPLICATIONS |
| #include "src/flags/flag-definitions.h" // NOLINT(build/include) |
| #undef FLAG_MODE_DEFINE_IMPLICATIONS |
| } while (changed); |
| ComputeFlagListHash(); |
| } |
| |
| uint32_t FlagList::Hash() { return flag_hash; } |
| |
| #undef FLAG_MODE_DEFINE |
| #undef FLAG_MODE_DEFINE_DEFAULTS |
| #undef FLAG_MODE_META |
| |
| } // namespace internal |
| } // namespace v8 |
