1260 lines
28 KiB
C++
Vendored
1260 lines
28 KiB
C++
Vendored
//===--- RustDemangle.cpp ---------------------------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines a demangler for Rust v0 mangled symbols as specified in
|
|
// https://rust-lang.github.io/rfcs/2603-rust-symbol-name-mangling-v0.html
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Demangle/Demangle.h"
|
|
#include "llvm/Demangle/StringViewExtras.h"
|
|
#include "llvm/Demangle/Utility.h"
|
|
|
|
#include <algorithm>
|
|
#include <cassert>
|
|
#include <cstdint>
|
|
#include <cstring>
|
|
#include <limits>
|
|
#include <string_view>
|
|
|
|
using namespace llvm;
|
|
|
|
using llvm::itanium_demangle::OutputBuffer;
|
|
using llvm::itanium_demangle::ScopedOverride;
|
|
using llvm::itanium_demangle::starts_with;
|
|
|
|
namespace {
|
|
|
|
struct Identifier {
|
|
std::string_view Name;
|
|
bool Punycode;
|
|
|
|
bool empty() const { return Name.empty(); }
|
|
};
|
|
|
|
enum class BasicType {
|
|
Bool,
|
|
Char,
|
|
I8,
|
|
I16,
|
|
I32,
|
|
I64,
|
|
I128,
|
|
ISize,
|
|
U8,
|
|
U16,
|
|
U32,
|
|
U64,
|
|
U128,
|
|
USize,
|
|
F32,
|
|
F64,
|
|
Str,
|
|
Placeholder,
|
|
Unit,
|
|
Variadic,
|
|
Never,
|
|
};
|
|
|
|
enum class IsInType {
|
|
No,
|
|
Yes,
|
|
};
|
|
|
|
enum class LeaveGenericsOpen {
|
|
No,
|
|
Yes,
|
|
};
|
|
|
|
class Demangler {
|
|
// Maximum recursion level. Used to avoid stack overflow.
|
|
size_t MaxRecursionLevel;
|
|
// Current recursion level.
|
|
size_t RecursionLevel;
|
|
size_t BoundLifetimes;
|
|
// Input string that is being demangled with "_R" prefix removed.
|
|
std::string_view Input;
|
|
// Position in the input string.
|
|
size_t Position;
|
|
// When true, print methods append the output to the stream.
|
|
// When false, the output is suppressed.
|
|
bool Print;
|
|
// True if an error occurred.
|
|
bool Error;
|
|
|
|
public:
|
|
// Demangled output.
|
|
OutputBuffer Output;
|
|
|
|
Demangler(size_t MaxRecursionLevel = 500);
|
|
|
|
bool demangle(std::string_view MangledName);
|
|
|
|
private:
|
|
bool demanglePath(IsInType Type,
|
|
LeaveGenericsOpen LeaveOpen = LeaveGenericsOpen::No);
|
|
void demangleImplPath(IsInType InType);
|
|
void demangleGenericArg();
|
|
void demangleType();
|
|
void demangleFnSig();
|
|
void demangleDynBounds();
|
|
void demangleDynTrait();
|
|
void demangleOptionalBinder();
|
|
void demangleConst();
|
|
void demangleConstInt();
|
|
void demangleConstBool();
|
|
void demangleConstChar();
|
|
|
|
template <typename Callable> void demangleBackref(Callable Demangler) {
|
|
uint64_t Backref = parseBase62Number();
|
|
if (Error || Backref >= Position) {
|
|
Error = true;
|
|
return;
|
|
}
|
|
|
|
if (!Print)
|
|
return;
|
|
|
|
ScopedOverride<size_t> SavePosition(Position, Position);
|
|
Position = Backref;
|
|
Demangler();
|
|
}
|
|
|
|
Identifier parseIdentifier();
|
|
uint64_t parseOptionalBase62Number(char Tag);
|
|
uint64_t parseBase62Number();
|
|
uint64_t parseDecimalNumber();
|
|
uint64_t parseHexNumber(std::string_view &HexDigits);
|
|
|
|
void print(char C);
|
|
void print(std::string_view S);
|
|
void printDecimalNumber(uint64_t N);
|
|
void printBasicType(BasicType);
|
|
void printLifetime(uint64_t Index);
|
|
void printIdentifier(Identifier Ident);
|
|
|
|
char look() const;
|
|
char consume();
|
|
bool consumeIf(char Prefix);
|
|
|
|
bool addAssign(uint64_t &A, uint64_t B);
|
|
bool mulAssign(uint64_t &A, uint64_t B);
|
|
};
|
|
|
|
} // namespace
|
|
|
|
char *llvm::rustDemangle(std::string_view MangledName) {
|
|
// Return early if mangled name doesn't look like a Rust symbol.
|
|
if (MangledName.empty() || !starts_with(MangledName, "_R"))
|
|
return nullptr;
|
|
|
|
Demangler D;
|
|
if (!D.demangle(MangledName)) {
|
|
std::free(D.Output.getBuffer());
|
|
return nullptr;
|
|
}
|
|
|
|
D.Output += '\0';
|
|
|
|
return D.Output.getBuffer();
|
|
}
|
|
|
|
Demangler::Demangler(size_t MaxRecursionLevel)
|
|
: MaxRecursionLevel(MaxRecursionLevel) {}
|
|
|
|
static inline bool isDigit(const char C) { return '0' <= C && C <= '9'; }
|
|
|
|
static inline bool isHexDigit(const char C) {
|
|
return ('0' <= C && C <= '9') || ('a' <= C && C <= 'f');
|
|
}
|
|
|
|
static inline bool isLower(const char C) { return 'a' <= C && C <= 'z'; }
|
|
|
|
static inline bool isUpper(const char C) { return 'A' <= C && C <= 'Z'; }
|
|
|
|
/// Returns true if C is a valid mangled character: <0-9a-zA-Z_>.
|
|
static inline bool isValid(const char C) {
|
|
return isDigit(C) || isLower(C) || isUpper(C) || C == '_';
|
|
}
|
|
|
|
// Demangles Rust v0 mangled symbol. Returns true when successful, and false
|
|
// otherwise. The demangled symbol is stored in Output field. It is
|
|
// responsibility of the caller to free the memory behind the output stream.
|
|
//
|
|
// <symbol-name> = "_R" <path> [<instantiating-crate>]
|
|
bool Demangler::demangle(std::string_view Mangled) {
|
|
Position = 0;
|
|
Error = false;
|
|
Print = true;
|
|
RecursionLevel = 0;
|
|
BoundLifetimes = 0;
|
|
|
|
if (!starts_with(Mangled, "_R")) {
|
|
Error = true;
|
|
return false;
|
|
}
|
|
Mangled.remove_prefix(2);
|
|
size_t Dot = Mangled.find('.');
|
|
Input = Dot == std::string_view::npos ? Mangled : Mangled.substr(0, Dot);
|
|
|
|
demanglePath(IsInType::No);
|
|
|
|
if (Position != Input.size()) {
|
|
ScopedOverride<bool> SavePrint(Print, false);
|
|
demanglePath(IsInType::No);
|
|
}
|
|
|
|
if (Position != Input.size())
|
|
Error = true;
|
|
|
|
if (Dot != std::string_view::npos) {
|
|
print(" (");
|
|
print(Mangled.substr(Dot));
|
|
print(")");
|
|
}
|
|
|
|
return !Error;
|
|
}
|
|
|
|
// Demangles a path. InType indicates whether a path is inside a type. When
|
|
// LeaveOpen is true, a closing `>` after generic arguments is omitted from the
|
|
// output. Return value indicates whether generics arguments have been left
|
|
// open.
|
|
//
|
|
// <path> = "C" <identifier> // crate root
|
|
// | "M" <impl-path> <type> // <T> (inherent impl)
|
|
// | "X" <impl-path> <type> <path> // <T as Trait> (trait impl)
|
|
// | "Y" <type> <path> // <T as Trait> (trait definition)
|
|
// | "N" <ns> <path> <identifier> // ...::ident (nested path)
|
|
// | "I" <path> {<generic-arg>} "E" // ...<T, U> (generic args)
|
|
// | <backref>
|
|
// <identifier> = [<disambiguator>] <undisambiguated-identifier>
|
|
// <ns> = "C" // closure
|
|
// | "S" // shim
|
|
// | <A-Z> // other special namespaces
|
|
// | <a-z> // internal namespaces
|
|
bool Demangler::demanglePath(IsInType InType, LeaveGenericsOpen LeaveOpen) {
|
|
if (Error || RecursionLevel >= MaxRecursionLevel) {
|
|
Error = true;
|
|
return false;
|
|
}
|
|
ScopedOverride<size_t> SaveRecursionLevel(RecursionLevel, RecursionLevel + 1);
|
|
|
|
switch (consume()) {
|
|
case 'C': {
|
|
parseOptionalBase62Number('s');
|
|
printIdentifier(parseIdentifier());
|
|
break;
|
|
}
|
|
case 'M': {
|
|
demangleImplPath(InType);
|
|
print("<");
|
|
demangleType();
|
|
print(">");
|
|
break;
|
|
}
|
|
case 'X': {
|
|
demangleImplPath(InType);
|
|
print("<");
|
|
demangleType();
|
|
print(" as ");
|
|
demanglePath(IsInType::Yes);
|
|
print(">");
|
|
break;
|
|
}
|
|
case 'Y': {
|
|
print("<");
|
|
demangleType();
|
|
print(" as ");
|
|
demanglePath(IsInType::Yes);
|
|
print(">");
|
|
break;
|
|
}
|
|
case 'N': {
|
|
char NS = consume();
|
|
if (!isLower(NS) && !isUpper(NS)) {
|
|
Error = true;
|
|
break;
|
|
}
|
|
demanglePath(InType);
|
|
|
|
uint64_t Disambiguator = parseOptionalBase62Number('s');
|
|
Identifier Ident = parseIdentifier();
|
|
|
|
if (isUpper(NS)) {
|
|
// Special namespaces
|
|
print("::{");
|
|
if (NS == 'C')
|
|
print("closure");
|
|
else if (NS == 'S')
|
|
print("shim");
|
|
else
|
|
print(NS);
|
|
if (!Ident.empty()) {
|
|
print(":");
|
|
printIdentifier(Ident);
|
|
}
|
|
print('#');
|
|
printDecimalNumber(Disambiguator);
|
|
print('}');
|
|
} else {
|
|
// Implementation internal namespaces.
|
|
if (!Ident.empty()) {
|
|
print("::");
|
|
printIdentifier(Ident);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case 'I': {
|
|
demanglePath(InType);
|
|
// Omit "::" when in a type, where it is optional.
|
|
if (InType == IsInType::No)
|
|
print("::");
|
|
print("<");
|
|
for (size_t I = 0; !Error && !consumeIf('E'); ++I) {
|
|
if (I > 0)
|
|
print(", ");
|
|
demangleGenericArg();
|
|
}
|
|
if (LeaveOpen == LeaveGenericsOpen::Yes)
|
|
return true;
|
|
else
|
|
print(">");
|
|
break;
|
|
}
|
|
case 'B': {
|
|
bool IsOpen = false;
|
|
demangleBackref([&] { IsOpen = demanglePath(InType, LeaveOpen); });
|
|
return IsOpen;
|
|
}
|
|
default:
|
|
Error = true;
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// <impl-path> = [<disambiguator>] <path>
|
|
// <disambiguator> = "s" <base-62-number>
|
|
void Demangler::demangleImplPath(IsInType InType) {
|
|
ScopedOverride<bool> SavePrint(Print, false);
|
|
parseOptionalBase62Number('s');
|
|
demanglePath(InType);
|
|
}
|
|
|
|
// <generic-arg> = <lifetime>
|
|
// | <type>
|
|
// | "K" <const>
|
|
// <lifetime> = "L" <base-62-number>
|
|
void Demangler::demangleGenericArg() {
|
|
if (consumeIf('L'))
|
|
printLifetime(parseBase62Number());
|
|
else if (consumeIf('K'))
|
|
demangleConst();
|
|
else
|
|
demangleType();
|
|
}
|
|
|
|
// <basic-type> = "a" // i8
|
|
// | "b" // bool
|
|
// | "c" // char
|
|
// | "d" // f64
|
|
// | "e" // str
|
|
// | "f" // f32
|
|
// | "h" // u8
|
|
// | "i" // isize
|
|
// | "j" // usize
|
|
// | "l" // i32
|
|
// | "m" // u32
|
|
// | "n" // i128
|
|
// | "o" // u128
|
|
// | "s" // i16
|
|
// | "t" // u16
|
|
// | "u" // ()
|
|
// | "v" // ...
|
|
// | "x" // i64
|
|
// | "y" // u64
|
|
// | "z" // !
|
|
// | "p" // placeholder (e.g. for generic params), shown as _
|
|
static bool parseBasicType(char C, BasicType &Type) {
|
|
switch (C) {
|
|
case 'a':
|
|
Type = BasicType::I8;
|
|
return true;
|
|
case 'b':
|
|
Type = BasicType::Bool;
|
|
return true;
|
|
case 'c':
|
|
Type = BasicType::Char;
|
|
return true;
|
|
case 'd':
|
|
Type = BasicType::F64;
|
|
return true;
|
|
case 'e':
|
|
Type = BasicType::Str;
|
|
return true;
|
|
case 'f':
|
|
Type = BasicType::F32;
|
|
return true;
|
|
case 'h':
|
|
Type = BasicType::U8;
|
|
return true;
|
|
case 'i':
|
|
Type = BasicType::ISize;
|
|
return true;
|
|
case 'j':
|
|
Type = BasicType::USize;
|
|
return true;
|
|
case 'l':
|
|
Type = BasicType::I32;
|
|
return true;
|
|
case 'm':
|
|
Type = BasicType::U32;
|
|
return true;
|
|
case 'n':
|
|
Type = BasicType::I128;
|
|
return true;
|
|
case 'o':
|
|
Type = BasicType::U128;
|
|
return true;
|
|
case 'p':
|
|
Type = BasicType::Placeholder;
|
|
return true;
|
|
case 's':
|
|
Type = BasicType::I16;
|
|
return true;
|
|
case 't':
|
|
Type = BasicType::U16;
|
|
return true;
|
|
case 'u':
|
|
Type = BasicType::Unit;
|
|
return true;
|
|
case 'v':
|
|
Type = BasicType::Variadic;
|
|
return true;
|
|
case 'x':
|
|
Type = BasicType::I64;
|
|
return true;
|
|
case 'y':
|
|
Type = BasicType::U64;
|
|
return true;
|
|
case 'z':
|
|
Type = BasicType::Never;
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void Demangler::printBasicType(BasicType Type) {
|
|
switch (Type) {
|
|
case BasicType::Bool:
|
|
print("bool");
|
|
break;
|
|
case BasicType::Char:
|
|
print("char");
|
|
break;
|
|
case BasicType::I8:
|
|
print("i8");
|
|
break;
|
|
case BasicType::I16:
|
|
print("i16");
|
|
break;
|
|
case BasicType::I32:
|
|
print("i32");
|
|
break;
|
|
case BasicType::I64:
|
|
print("i64");
|
|
break;
|
|
case BasicType::I128:
|
|
print("i128");
|
|
break;
|
|
case BasicType::ISize:
|
|
print("isize");
|
|
break;
|
|
case BasicType::U8:
|
|
print("u8");
|
|
break;
|
|
case BasicType::U16:
|
|
print("u16");
|
|
break;
|
|
case BasicType::U32:
|
|
print("u32");
|
|
break;
|
|
case BasicType::U64:
|
|
print("u64");
|
|
break;
|
|
case BasicType::U128:
|
|
print("u128");
|
|
break;
|
|
case BasicType::USize:
|
|
print("usize");
|
|
break;
|
|
case BasicType::F32:
|
|
print("f32");
|
|
break;
|
|
case BasicType::F64:
|
|
print("f64");
|
|
break;
|
|
case BasicType::Str:
|
|
print("str");
|
|
break;
|
|
case BasicType::Placeholder:
|
|
print("_");
|
|
break;
|
|
case BasicType::Unit:
|
|
print("()");
|
|
break;
|
|
case BasicType::Variadic:
|
|
print("...");
|
|
break;
|
|
case BasicType::Never:
|
|
print("!");
|
|
break;
|
|
}
|
|
}
|
|
|
|
// <type> = | <basic-type>
|
|
// | <path> // named type
|
|
// | "A" <type> <const> // [T; N]
|
|
// | "S" <type> // [T]
|
|
// | "T" {<type>} "E" // (T1, T2, T3, ...)
|
|
// | "R" [<lifetime>] <type> // &T
|
|
// | "Q" [<lifetime>] <type> // &mut T
|
|
// | "P" <type> // *const T
|
|
// | "O" <type> // *mut T
|
|
// | "F" <fn-sig> // fn(...) -> ...
|
|
// | "D" <dyn-bounds> <lifetime> // dyn Trait<Assoc = X> + Send + 'a
|
|
// | <backref> // backref
|
|
void Demangler::demangleType() {
|
|
if (Error || RecursionLevel >= MaxRecursionLevel) {
|
|
Error = true;
|
|
return;
|
|
}
|
|
ScopedOverride<size_t> SaveRecursionLevel(RecursionLevel, RecursionLevel + 1);
|
|
|
|
size_t Start = Position;
|
|
char C = consume();
|
|
BasicType Type;
|
|
if (parseBasicType(C, Type))
|
|
return printBasicType(Type);
|
|
|
|
switch (C) {
|
|
case 'A':
|
|
print("[");
|
|
demangleType();
|
|
print("; ");
|
|
demangleConst();
|
|
print("]");
|
|
break;
|
|
case 'S':
|
|
print("[");
|
|
demangleType();
|
|
print("]");
|
|
break;
|
|
case 'T': {
|
|
print("(");
|
|
size_t I = 0;
|
|
for (; !Error && !consumeIf('E'); ++I) {
|
|
if (I > 0)
|
|
print(", ");
|
|
demangleType();
|
|
}
|
|
if (I == 1)
|
|
print(",");
|
|
print(")");
|
|
break;
|
|
}
|
|
case 'R':
|
|
case 'Q':
|
|
print('&');
|
|
if (consumeIf('L')) {
|
|
if (auto Lifetime = parseBase62Number()) {
|
|
printLifetime(Lifetime);
|
|
print(' ');
|
|
}
|
|
}
|
|
if (C == 'Q')
|
|
print("mut ");
|
|
demangleType();
|
|
break;
|
|
case 'P':
|
|
print("*const ");
|
|
demangleType();
|
|
break;
|
|
case 'O':
|
|
print("*mut ");
|
|
demangleType();
|
|
break;
|
|
case 'F':
|
|
demangleFnSig();
|
|
break;
|
|
case 'D':
|
|
demangleDynBounds();
|
|
if (consumeIf('L')) {
|
|
if (auto Lifetime = parseBase62Number()) {
|
|
print(" + ");
|
|
printLifetime(Lifetime);
|
|
}
|
|
} else {
|
|
Error = true;
|
|
}
|
|
break;
|
|
case 'B':
|
|
demangleBackref([&] { demangleType(); });
|
|
break;
|
|
default:
|
|
Position = Start;
|
|
demanglePath(IsInType::Yes);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// <fn-sig> := [<binder>] ["U"] ["K" <abi>] {<type>} "E" <type>
|
|
// <abi> = "C"
|
|
// | <undisambiguated-identifier>
|
|
void Demangler::demangleFnSig() {
|
|
ScopedOverride<size_t> SaveBoundLifetimes(BoundLifetimes, BoundLifetimes);
|
|
demangleOptionalBinder();
|
|
|
|
if (consumeIf('U'))
|
|
print("unsafe ");
|
|
|
|
if (consumeIf('K')) {
|
|
print("extern \"");
|
|
if (consumeIf('C')) {
|
|
print("C");
|
|
} else {
|
|
Identifier Ident = parseIdentifier();
|
|
if (Ident.Punycode)
|
|
Error = true;
|
|
for (char C : Ident.Name) {
|
|
// When mangling ABI string, the "-" is replaced with "_".
|
|
if (C == '_')
|
|
C = '-';
|
|
print(C);
|
|
}
|
|
}
|
|
print("\" ");
|
|
}
|
|
|
|
print("fn(");
|
|
for (size_t I = 0; !Error && !consumeIf('E'); ++I) {
|
|
if (I > 0)
|
|
print(", ");
|
|
demangleType();
|
|
}
|
|
print(")");
|
|
|
|
if (consumeIf('u')) {
|
|
// Skip the unit type from the output.
|
|
} else {
|
|
print(" -> ");
|
|
demangleType();
|
|
}
|
|
}
|
|
|
|
// <dyn-bounds> = [<binder>] {<dyn-trait>} "E"
|
|
void Demangler::demangleDynBounds() {
|
|
ScopedOverride<size_t> SaveBoundLifetimes(BoundLifetimes, BoundLifetimes);
|
|
print("dyn ");
|
|
demangleOptionalBinder();
|
|
for (size_t I = 0; !Error && !consumeIf('E'); ++I) {
|
|
if (I > 0)
|
|
print(" + ");
|
|
demangleDynTrait();
|
|
}
|
|
}
|
|
|
|
// <dyn-trait> = <path> {<dyn-trait-assoc-binding>}
|
|
// <dyn-trait-assoc-binding> = "p" <undisambiguated-identifier> <type>
|
|
void Demangler::demangleDynTrait() {
|
|
bool IsOpen = demanglePath(IsInType::Yes, LeaveGenericsOpen::Yes);
|
|
while (!Error && consumeIf('p')) {
|
|
if (!IsOpen) {
|
|
IsOpen = true;
|
|
print('<');
|
|
} else {
|
|
print(", ");
|
|
}
|
|
print(parseIdentifier().Name);
|
|
print(" = ");
|
|
demangleType();
|
|
}
|
|
if (IsOpen)
|
|
print(">");
|
|
}
|
|
|
|
// Demangles optional binder and updates the number of bound lifetimes.
|
|
//
|
|
// <binder> = "G" <base-62-number>
|
|
void Demangler::demangleOptionalBinder() {
|
|
uint64_t Binder = parseOptionalBase62Number('G');
|
|
if (Error || Binder == 0)
|
|
return;
|
|
|
|
// In valid inputs each bound lifetime is referenced later. Referencing a
|
|
// lifetime requires at least one byte of input. Reject inputs that are too
|
|
// short to reference all bound lifetimes. Otherwise demangling of invalid
|
|
// binders could generate excessive amounts of output.
|
|
if (Binder >= Input.size() - BoundLifetimes) {
|
|
Error = true;
|
|
return;
|
|
}
|
|
|
|
print("for<");
|
|
for (size_t I = 0; I != Binder; ++I) {
|
|
BoundLifetimes += 1;
|
|
if (I > 0)
|
|
print(", ");
|
|
printLifetime(1);
|
|
}
|
|
print("> ");
|
|
}
|
|
|
|
// <const> = <basic-type> <const-data>
|
|
// | "p" // placeholder
|
|
// | <backref>
|
|
void Demangler::demangleConst() {
|
|
if (Error || RecursionLevel >= MaxRecursionLevel) {
|
|
Error = true;
|
|
return;
|
|
}
|
|
ScopedOverride<size_t> SaveRecursionLevel(RecursionLevel, RecursionLevel + 1);
|
|
|
|
char C = consume();
|
|
BasicType Type;
|
|
if (parseBasicType(C, Type)) {
|
|
switch (Type) {
|
|
case BasicType::I8:
|
|
case BasicType::I16:
|
|
case BasicType::I32:
|
|
case BasicType::I64:
|
|
case BasicType::I128:
|
|
case BasicType::ISize:
|
|
case BasicType::U8:
|
|
case BasicType::U16:
|
|
case BasicType::U32:
|
|
case BasicType::U64:
|
|
case BasicType::U128:
|
|
case BasicType::USize:
|
|
demangleConstInt();
|
|
break;
|
|
case BasicType::Bool:
|
|
demangleConstBool();
|
|
break;
|
|
case BasicType::Char:
|
|
demangleConstChar();
|
|
break;
|
|
case BasicType::Placeholder:
|
|
print('_');
|
|
break;
|
|
default:
|
|
Error = true;
|
|
break;
|
|
}
|
|
} else if (C == 'B') {
|
|
demangleBackref([&] { demangleConst(); });
|
|
} else {
|
|
Error = true;
|
|
}
|
|
}
|
|
|
|
// <const-data> = ["n"] <hex-number>
|
|
void Demangler::demangleConstInt() {
|
|
if (consumeIf('n'))
|
|
print('-');
|
|
|
|
std::string_view HexDigits;
|
|
uint64_t Value = parseHexNumber(HexDigits);
|
|
if (HexDigits.size() <= 16) {
|
|
printDecimalNumber(Value);
|
|
} else {
|
|
print("0x");
|
|
print(HexDigits);
|
|
}
|
|
}
|
|
|
|
// <const-data> = "0_" // false
|
|
// | "1_" // true
|
|
void Demangler::demangleConstBool() {
|
|
std::string_view HexDigits;
|
|
parseHexNumber(HexDigits);
|
|
if (HexDigits == "0")
|
|
print("false");
|
|
else if (HexDigits == "1")
|
|
print("true");
|
|
else
|
|
Error = true;
|
|
}
|
|
|
|
/// Returns true if CodePoint represents a printable ASCII character.
|
|
static bool isAsciiPrintable(uint64_t CodePoint) {
|
|
return 0x20 <= CodePoint && CodePoint <= 0x7e;
|
|
}
|
|
|
|
// <const-data> = <hex-number>
|
|
void Demangler::demangleConstChar() {
|
|
std::string_view HexDigits;
|
|
uint64_t CodePoint = parseHexNumber(HexDigits);
|
|
if (Error || HexDigits.size() > 6) {
|
|
Error = true;
|
|
return;
|
|
}
|
|
|
|
print("'");
|
|
switch (CodePoint) {
|
|
case '\t':
|
|
print(R"(\t)");
|
|
break;
|
|
case '\r':
|
|
print(R"(\r)");
|
|
break;
|
|
case '\n':
|
|
print(R"(\n)");
|
|
break;
|
|
case '\\':
|
|
print(R"(\\)");
|
|
break;
|
|
case '"':
|
|
print(R"(")");
|
|
break;
|
|
case '\'':
|
|
print(R"(\')");
|
|
break;
|
|
default:
|
|
if (isAsciiPrintable(CodePoint)) {
|
|
char C = CodePoint;
|
|
print(C);
|
|
} else {
|
|
print(R"(\u{)");
|
|
print(HexDigits);
|
|
print('}');
|
|
}
|
|
break;
|
|
}
|
|
print('\'');
|
|
}
|
|
|
|
// <undisambiguated-identifier> = ["u"] <decimal-number> ["_"] <bytes>
|
|
Identifier Demangler::parseIdentifier() {
|
|
bool Punycode = consumeIf('u');
|
|
uint64_t Bytes = parseDecimalNumber();
|
|
|
|
// Underscore resolves the ambiguity when identifier starts with a decimal
|
|
// digit or another underscore.
|
|
consumeIf('_');
|
|
|
|
if (Error || Bytes > Input.size() - Position) {
|
|
Error = true;
|
|
return {};
|
|
}
|
|
std::string_view S = Input.substr(Position, Bytes);
|
|
Position += Bytes;
|
|
|
|
if (!std::all_of(S.begin(), S.end(), isValid)) {
|
|
Error = true;
|
|
return {};
|
|
}
|
|
|
|
return {S, Punycode};
|
|
}
|
|
|
|
// Parses optional base 62 number. The presence of a number is determined using
|
|
// Tag. Returns 0 when tag is absent and parsed value + 1 otherwise
|
|
//
|
|
// This function is indended for parsing disambiguators and binders which when
|
|
// not present have their value interpreted as 0, and otherwise as decoded
|
|
// value + 1. For example for binders, value for "G_" is 1, for "G0_" value is
|
|
// 2. When "G" is absent value is 0.
|
|
uint64_t Demangler::parseOptionalBase62Number(char Tag) {
|
|
if (!consumeIf(Tag))
|
|
return 0;
|
|
|
|
uint64_t N = parseBase62Number();
|
|
if (Error || !addAssign(N, 1))
|
|
return 0;
|
|
|
|
return N;
|
|
}
|
|
|
|
// Parses base 62 number with <0-9a-zA-Z> as digits. Number is terminated by
|
|
// "_". All values are offset by 1, so that "_" encodes 0, "0_" encodes 1,
|
|
// "1_" encodes 2, etc.
|
|
//
|
|
// <base-62-number> = {<0-9a-zA-Z>} "_"
|
|
uint64_t Demangler::parseBase62Number() {
|
|
if (consumeIf('_'))
|
|
return 0;
|
|
|
|
uint64_t Value = 0;
|
|
|
|
while (true) {
|
|
uint64_t Digit;
|
|
char C = consume();
|
|
|
|
if (C == '_') {
|
|
break;
|
|
} else if (isDigit(C)) {
|
|
Digit = C - '0';
|
|
} else if (isLower(C)) {
|
|
Digit = 10 + (C - 'a');
|
|
} else if (isUpper(C)) {
|
|
Digit = 10 + 26 + (C - 'A');
|
|
} else {
|
|
Error = true;
|
|
return 0;
|
|
}
|
|
|
|
if (!mulAssign(Value, 62))
|
|
return 0;
|
|
|
|
if (!addAssign(Value, Digit))
|
|
return 0;
|
|
}
|
|
|
|
if (!addAssign(Value, 1))
|
|
return 0;
|
|
|
|
return Value;
|
|
}
|
|
|
|
// Parses a decimal number that had been encoded without any leading zeros.
|
|
//
|
|
// <decimal-number> = "0"
|
|
// | <1-9> {<0-9>}
|
|
uint64_t Demangler::parseDecimalNumber() {
|
|
char C = look();
|
|
if (!isDigit(C)) {
|
|
Error = true;
|
|
return 0;
|
|
}
|
|
|
|
if (C == '0') {
|
|
consume();
|
|
return 0;
|
|
}
|
|
|
|
uint64_t Value = 0;
|
|
|
|
while (isDigit(look())) {
|
|
if (!mulAssign(Value, 10)) {
|
|
Error = true;
|
|
return 0;
|
|
}
|
|
|
|
uint64_t D = consume() - '0';
|
|
if (!addAssign(Value, D))
|
|
return 0;
|
|
}
|
|
|
|
return Value;
|
|
}
|
|
|
|
// Parses a hexadecimal number with <0-9a-f> as a digits. Returns the parsed
|
|
// value and stores hex digits in HexDigits. The return value is unspecified if
|
|
// HexDigits.size() > 16.
|
|
//
|
|
// <hex-number> = "0_"
|
|
// | <1-9a-f> {<0-9a-f>} "_"
|
|
uint64_t Demangler::parseHexNumber(std::string_view &HexDigits) {
|
|
size_t Start = Position;
|
|
uint64_t Value = 0;
|
|
|
|
if (!isHexDigit(look()))
|
|
Error = true;
|
|
|
|
if (consumeIf('0')) {
|
|
if (!consumeIf('_'))
|
|
Error = true;
|
|
} else {
|
|
while (!Error && !consumeIf('_')) {
|
|
char C = consume();
|
|
Value *= 16;
|
|
if (isDigit(C))
|
|
Value += C - '0';
|
|
else if ('a' <= C && C <= 'f')
|
|
Value += 10 + (C - 'a');
|
|
else
|
|
Error = true;
|
|
}
|
|
}
|
|
|
|
if (Error) {
|
|
HexDigits = std::string_view();
|
|
return 0;
|
|
}
|
|
|
|
size_t End = Position - 1;
|
|
assert(Start < End);
|
|
HexDigits = Input.substr(Start, End - Start);
|
|
return Value;
|
|
}
|
|
|
|
void Demangler::print(char C) {
|
|
if (Error || !Print)
|
|
return;
|
|
|
|
Output += C;
|
|
}
|
|
|
|
void Demangler::print(std::string_view S) {
|
|
if (Error || !Print)
|
|
return;
|
|
|
|
Output += S;
|
|
}
|
|
|
|
void Demangler::printDecimalNumber(uint64_t N) {
|
|
if (Error || !Print)
|
|
return;
|
|
|
|
Output << N;
|
|
}
|
|
|
|
// Prints a lifetime. An index 0 always represents an erased lifetime. Indices
|
|
// starting from 1, are De Bruijn indices, referring to higher-ranked lifetimes
|
|
// bound by one of the enclosing binders.
|
|
void Demangler::printLifetime(uint64_t Index) {
|
|
if (Index == 0) {
|
|
print("'_");
|
|
return;
|
|
}
|
|
|
|
if (Index - 1 >= BoundLifetimes) {
|
|
Error = true;
|
|
return;
|
|
}
|
|
|
|
uint64_t Depth = BoundLifetimes - Index;
|
|
print('\'');
|
|
if (Depth < 26) {
|
|
char C = 'a' + Depth;
|
|
print(C);
|
|
} else {
|
|
print('z');
|
|
printDecimalNumber(Depth - 26 + 1);
|
|
}
|
|
}
|
|
|
|
static inline bool decodePunycodeDigit(char C, size_t &Value) {
|
|
if (isLower(C)) {
|
|
Value = C - 'a';
|
|
return true;
|
|
}
|
|
|
|
if (isDigit(C)) {
|
|
Value = 26 + (C - '0');
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void removeNullBytes(OutputBuffer &Output, size_t StartIdx) {
|
|
char *Buffer = Output.getBuffer();
|
|
char *Start = Buffer + StartIdx;
|
|
char *End = Buffer + Output.getCurrentPosition();
|
|
Output.setCurrentPosition(std::remove(Start, End, '\0') - Buffer);
|
|
}
|
|
|
|
// Encodes code point as UTF-8 and stores results in Output. Returns false if
|
|
// CodePoint is not a valid unicode scalar value.
|
|
static inline bool encodeUTF8(size_t CodePoint, char *Output) {
|
|
if (0xD800 <= CodePoint && CodePoint <= 0xDFFF)
|
|
return false;
|
|
|
|
if (CodePoint <= 0x7F) {
|
|
Output[0] = CodePoint;
|
|
return true;
|
|
}
|
|
|
|
if (CodePoint <= 0x7FF) {
|
|
Output[0] = 0xC0 | ((CodePoint >> 6) & 0x3F);
|
|
Output[1] = 0x80 | (CodePoint & 0x3F);
|
|
return true;
|
|
}
|
|
|
|
if (CodePoint <= 0xFFFF) {
|
|
Output[0] = 0xE0 | (CodePoint >> 12);
|
|
Output[1] = 0x80 | ((CodePoint >> 6) & 0x3F);
|
|
Output[2] = 0x80 | (CodePoint & 0x3F);
|
|
return true;
|
|
}
|
|
|
|
if (CodePoint <= 0x10FFFF) {
|
|
Output[0] = 0xF0 | (CodePoint >> 18);
|
|
Output[1] = 0x80 | ((CodePoint >> 12) & 0x3F);
|
|
Output[2] = 0x80 | ((CodePoint >> 6) & 0x3F);
|
|
Output[3] = 0x80 | (CodePoint & 0x3F);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// Decodes string encoded using punycode and appends results to Output.
|
|
// Returns true if decoding was successful.
|
|
static bool decodePunycode(std::string_view Input, OutputBuffer &Output) {
|
|
size_t OutputSize = Output.getCurrentPosition();
|
|
size_t InputIdx = 0;
|
|
|
|
// Rust uses an underscore as a delimiter.
|
|
size_t DelimiterPos = std::string_view::npos;
|
|
for (size_t I = 0; I != Input.size(); ++I)
|
|
if (Input[I] == '_')
|
|
DelimiterPos = I;
|
|
|
|
if (DelimiterPos != std::string_view::npos) {
|
|
// Copy basic code points before the last delimiter to the output.
|
|
for (; InputIdx != DelimiterPos; ++InputIdx) {
|
|
char C = Input[InputIdx];
|
|
if (!isValid(C))
|
|
return false;
|
|
// Code points are padded with zeros while decoding is in progress.
|
|
char UTF8[4] = {C};
|
|
Output += std::string_view(UTF8, 4);
|
|
}
|
|
// Skip over the delimiter.
|
|
++InputIdx;
|
|
}
|
|
|
|
size_t Base = 36;
|
|
size_t Skew = 38;
|
|
size_t Bias = 72;
|
|
size_t N = 0x80;
|
|
size_t TMin = 1;
|
|
size_t TMax = 26;
|
|
size_t Damp = 700;
|
|
|
|
auto Adapt = [&](size_t Delta, size_t NumPoints) {
|
|
Delta /= Damp;
|
|
Delta += Delta / NumPoints;
|
|
Damp = 2;
|
|
|
|
size_t K = 0;
|
|
while (Delta > (Base - TMin) * TMax / 2) {
|
|
Delta /= Base - TMin;
|
|
K += Base;
|
|
}
|
|
return K + (((Base - TMin + 1) * Delta) / (Delta + Skew));
|
|
};
|
|
|
|
// Main decoding loop.
|
|
for (size_t I = 0; InputIdx != Input.size(); I += 1) {
|
|
size_t OldI = I;
|
|
size_t W = 1;
|
|
size_t Max = std::numeric_limits<size_t>::max();
|
|
for (size_t K = Base; true; K += Base) {
|
|
if (InputIdx == Input.size())
|
|
return false;
|
|
char C = Input[InputIdx++];
|
|
size_t Digit = 0;
|
|
if (!decodePunycodeDigit(C, Digit))
|
|
return false;
|
|
|
|
if (Digit > (Max - I) / W)
|
|
return false;
|
|
I += Digit * W;
|
|
|
|
size_t T;
|
|
if (K <= Bias)
|
|
T = TMin;
|
|
else if (K >= Bias + TMax)
|
|
T = TMax;
|
|
else
|
|
T = K - Bias;
|
|
|
|
if (Digit < T)
|
|
break;
|
|
|
|
if (W > Max / (Base - T))
|
|
return false;
|
|
W *= (Base - T);
|
|
}
|
|
size_t NumPoints = (Output.getCurrentPosition() - OutputSize) / 4 + 1;
|
|
Bias = Adapt(I - OldI, NumPoints);
|
|
|
|
if (I / NumPoints > Max - N)
|
|
return false;
|
|
N += I / NumPoints;
|
|
I = I % NumPoints;
|
|
|
|
// Insert N at position I in the output.
|
|
char UTF8[4] = {};
|
|
if (!encodeUTF8(N, UTF8))
|
|
return false;
|
|
Output.insert(OutputSize + I * 4, UTF8, 4);
|
|
}
|
|
|
|
removeNullBytes(Output, OutputSize);
|
|
return true;
|
|
}
|
|
|
|
void Demangler::printIdentifier(Identifier Ident) {
|
|
if (Error || !Print)
|
|
return;
|
|
|
|
if (Ident.Punycode) {
|
|
if (!decodePunycode(Ident.Name, Output))
|
|
Error = true;
|
|
} else {
|
|
print(Ident.Name);
|
|
}
|
|
}
|
|
|
|
char Demangler::look() const {
|
|
if (Error || Position >= Input.size())
|
|
return 0;
|
|
|
|
return Input[Position];
|
|
}
|
|
|
|
char Demangler::consume() {
|
|
if (Error || Position >= Input.size()) {
|
|
Error = true;
|
|
return 0;
|
|
}
|
|
|
|
return Input[Position++];
|
|
}
|
|
|
|
bool Demangler::consumeIf(char Prefix) {
|
|
if (Error || Position >= Input.size() || Input[Position] != Prefix)
|
|
return false;
|
|
|
|
Position += 1;
|
|
return true;
|
|
}
|
|
|
|
/// Computes A + B. When computation wraps around sets the error and returns
|
|
/// false. Otherwise assigns the result to A and returns true.
|
|
bool Demangler::addAssign(uint64_t &A, uint64_t B) {
|
|
if (A > std::numeric_limits<uint64_t>::max() - B) {
|
|
Error = true;
|
|
return false;
|
|
}
|
|
|
|
A += B;
|
|
return true;
|
|
}
|
|
|
|
/// Computes A * B. When computation wraps around sets the error and returns
|
|
/// false. Otherwise assigns the result to A and returns true.
|
|
bool Demangler::mulAssign(uint64_t &A, uint64_t B) {
|
|
if (B != 0 && A > std::numeric_limits<uint64_t>::max() / B) {
|
|
Error = true;
|
|
return false;
|
|
}
|
|
|
|
A *= B;
|
|
return true;
|
|
}
|