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parser.cpp
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parser.cpp
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// Copyright (c) Open Enclave SDK contributors.
// Licensed under the MIT License.
#include <algorithm>
#include <cstddef>
#include <map>
#include "parser.h"
#include "preprocessor.h"
#include "utils.h"
// Stack of edl files being parsed.
std::vector<std::string> Parser::stack_;
// Cache for edl files that have already been parsed.
// Reimporting an edl would just return the preparsed edl.
std::map<std::string, Edl*> Parser::cache_;
static bool _is_file(const std::string& path)
{
FILE* f = fopen(path.c_str(), "r");
if (f)
{
fclose(f);
return true;
}
return false;
}
Parser::Parser(
const std::string& filename,
const std::vector<std::string>& searchpaths,
const std::vector<std::string>& defines)
: filename_(filename),
basename_(),
searchpaths_(searchpaths),
defines_(defines),
lex_(),
t_(),
line_(1),
col_(1),
in_struct_(false),
in_function_(false),
includes_(),
types_(),
trusted_funcs_(),
untrusted_funcs_(),
imported_trusted_funcs_(),
imported_untrusted_funcs_(),
pp_(defines)
{
std::string f = filename_;
if (!_is_file(f))
{
for (auto&& sp : searchpaths_)
{
f = fix_path_separators(sp + path_sep() + filename_);
if (_is_file(f))
break;
}
}
if (!_is_file(f))
{
fprintf(
stderr,
"error: file not found within search paths: %s\n",
filename_.c_str());
exit(1);
}
// Search for the right occurance of path sep.
size_t p = f.rfind(path_sep());
if (p != std::string::npos)
basename_ =
std::string(f.begin() + static_cast<ptrdiff_t>(p) + 1, f.end());
else
basename_ = filename_;
p = basename_.rfind('.');
if (p != std::string::npos)
basename_ = std::string(
basename_.begin(), basename_.begin() + static_cast<ptrdiff_t>(p));
lex_ = new Lexer(f);
t_ = get_preprocessed_token();
t1_ = get_preprocessed_token();
// Remember full path to file.
filename_ = f;
}
Parser::~Parser()
{
}
Token Parser::peek()
{
return t_;
}
Token Parser::peek1()
{
return t1_;
}
Token Parser::next()
{
Token t = t_;
t_ = t1_;
t1_ = get_preprocessed_token();
line_ = t.line_;
col_ = t.col_;
return t;
}
bool Parser::print_loc(
const std::string& msg_kind,
const char* filename,
int line,
int col)
{
if (msg_kind == "error")
fprintf(stderr, "%s: %s:%d:%d ", msg_kind.c_str(), filename, line, col);
else
printf("%s: %s:%d:%d ", msg_kind.c_str(), filename_.c_str(), line, col);
return true;
}
#define ERROR_AT(t, fmt, ...) \
do \
{ \
print_loc("error", filename_.c_str(), t.line_, t.col_); \
fprintf(stderr, fmt, ##__VA_ARGS__); \
fprintf(stderr, "\n"); \
exit(1); \
} while (0)
#define ERROR(fmt, ...) \
do \
{ \
print_loc("error", filename_.c_str(), line_, col_); \
fprintf(stderr, fmt, ##__VA_ARGS__); \
fprintf(stderr, "\n"); \
exit(1); \
} while (0)
Token Parser::get_preprocessed_token()
{
Token t = lex_->next();
while (t == "#")
{
t = lex_->next();
if (t == "ifdef")
{
t = lex_->next();
std::string name = static_cast<std::string>(t);
if (!pp_.process(Ifdef, name))
ERROR("unexpected error with #ifdef");
t = lex_->next();
}
else if (t == "ifndef")
{
t = lex_->next();
std::string name = static_cast<std::string>(t);
if (!pp_.process(Ifndef, name))
ERROR("unexpected error with #ifndef");
t = lex_->next();
}
else if (t == "else")
{
if (!pp_.process(Else))
ERROR("no previous #ifdef or #ifndef");
t = lex_->next();
}
else if (t == "endif")
{
if (!pp_.process(Endif))
ERROR("no previous #ifdef, #ifndef, or #else");
t = lex_->next();
}
else
{
ERROR(
"unsupported directive %s",
static_cast<std::string>(t).c_str());
}
if (!pp_.is_included())
{
// Skip tokens till next preprocessor directive.
while (t != "#" && !t.is_eof())
{
t = lex_->next();
}
}
}
return t;
}
void Parser::expect(const char* str)
{
Token t = next();
if (t != str)
ERROR(
" expecting %s got %*.*s\n",
str,
0,
static_cast<int>(t.end_ - t.start_),
t.start_);
}
Edl* Parser::parse()
{
// Detect recursive imports.
if (in(filename_, stack_))
{
fprintf(stderr, "error: recursive import detected\n");
for (auto itr = stack_.rbegin(); itr != stack_.rend(); ++itr)
fprintf(stderr, "%s\n", itr->c_str());
exit(1);
}
// If the edl has already been parsed, return the cached result.
if (cache_.count(filename_))
return cache_[filename_];
printf("Processing %s.\n", filename_.c_str());
stack_.push_back(filename_);
expect("enclave");
expect("{");
Edl* edl = parse_body();
edl->name_ = basename_;
expect("}");
stack_.pop_back();
// Update cache.
cache_[filename_] = edl;
return edl;
}
Edl* Parser::parse_body()
{
while (peek() != '}' && peek() != '\0')
{
Token t = next();
if (t == "trusted")
parse_trusted();
else if (t == "untrusted")
parse_untrusted();
else if (t == "include")
parse_include();
else if (t == "import")
parse_import();
else if (t == "enum")
parse_enum();
else if (t == "struct" || t == "union")
parse_struct_or_union(t == "struct");
else if (t == "from")
parse_from_import();
else
{
ERROR("unexpected token %s\n", static_cast<std::string>(t).c_str());
}
}
if (!pp_.is_closed())
ERROR("unterminated #ifdef or #ifndef");
append(trusted_funcs_, imported_trusted_funcs_);
append(untrusted_funcs_, imported_untrusted_funcs_);
return new Edl{
basename_, includes_, types_, trusted_funcs_, untrusted_funcs_};
}
void Parser::parse_include()
{
Token t = next();
if (!t.starts_with("\""))
ERROR("expecting header filename");
append_include(t);
}
Edl* Parser::parse_import_file()
{
Token t = next();
if (!t.starts_with("\""))
ERROR("expecting edl filename");
Edl* edl = nullptr;
if (pp_.is_included())
{
Parser p(std::string(t.start_ + 1, t.end_ - 1), searchpaths_, defines_);
edl = p.parse();
}
return edl;
}
void Parser::parse_import()
{
Edl* edl = parse_import_file();
/*
* In the case that import is excluded by the directive,
* parse_import_file will return nullptr. Fall through directly
* as the following logic does not affect the progression of the
* parser.
*/
if (!edl)
return;
for (UserType* type : edl->types_)
append_type(type);
for (const std::string& inc : edl->includes_)
append_include(inc);
for (Function* f : edl->trusted_funcs_)
append_function(imported_trusted_funcs_, f);
for (Function* f : edl->untrusted_funcs_)
append_function(imported_untrusted_funcs_, f);
}
template <typename T>
static T* lookup(const std::vector<T*>& vec, const std::string& name)
{
for (T* item : vec)
if (item->name_ == name)
return item;
return nullptr;
}
void Parser::append_include(const std::string& inc)
{
if (std::find(includes_.begin(), includes_.end(), inc) == includes_.end())
includes_.push_back(inc);
}
void Parser::append_type(UserType* type)
{
std::string name = type->name_;
UserType* t = lookup(types_, name);
if (t && t != type)
ERROR("Duplicate type definition detected for %s", name.c_str());
if (!t)
types_.push_back(type);
}
void Parser::append_function(std::vector<Function*>& funcs, Function* f)
{
std::string name = f->name_;
Function* trusted_f = lookup(trusted_funcs_, name);
Function* untrusted_f = lookup(untrusted_funcs_, name);
Function* imported_trusted_f = lookup(imported_trusted_funcs_, name);
Function* imported_untrusted_f = lookup(imported_untrusted_funcs_, name);
bool duplicate = (trusted_f && f != trusted_f) ||
(untrusted_f && f != untrusted_f) ||
(imported_trusted_f && imported_trusted_f != f) ||
(imported_untrusted_f && imported_untrusted_f != f);
if (duplicate)
ERROR("Duplicate function definition detected for %s", name.c_str());
// If the function does not already exist, append.
if (!trusted_f && !untrusted_f && !imported_trusted_f &&
!imported_untrusted_f)
funcs.push_back(f);
}
void Parser::parse_from_import()
{
Edl* edl = parse_import_file();
/*
* In the case that import is excluded by the directive,
* parse_import_file will return nullptr. We cannot fall through
* directly as the following logic affects the progression of
* the parser. Instead, checking if the edl is nullptr before
* referencing it.
*/
if (edl)
{
for (UserType* type : edl->types_)
append_type(type);
for (const std::string& inc : edl->includes_)
append_include(inc);
}
expect("import");
if (peek() == '*')
{
next();
if (edl)
{
for (Function* f : edl->trusted_funcs_)
append_function(imported_trusted_funcs_, f);
for (Function* f : edl->untrusted_funcs_)
append_function(imported_untrusted_funcs_, f);
}
}
else
{
while (peek() != ';' && !peek().is_eof())
{
Token t = next();
if (!t.is_name())
ERROR("expecting function name");
if (edl)
{
std::string function_name = t;
Function* imported_f =
lookup(edl->trusted_funcs_, function_name);
std::vector<Function*>* funcs = &imported_trusted_funcs_;
if (!imported_f)
{
imported_f = lookup(edl->untrusted_funcs_, function_name);
funcs = &imported_untrusted_funcs_;
}
if (imported_f)
{
append_function(*funcs, imported_f);
}
else
{
ERROR(
"function %s not found in imported edl.",
function_name.c_str());
}
}
if (peek() != ';')
expect(",");
}
}
expect(";");
}
void Parser::parse_enum()
{
std::string enum_name = "";
if (peek().is_name())
enum_name = next();
UserType* type = new UserType{enum_name, Enum, {}, {}};
expect("{");
while (peek() != '}')
{
Token name = next();
if (!name.is_name())
ERROR(
"expecting identifier, got %s",
static_cast<std::string>(name).c_str());
Token* value = nullptr;
if (peek() == '=')
{
next();
value = new Token(next());
if (!value->is_name() && !value->is_int())
ERROR(
"expecting enum value, got %s",
static_cast<std::string>(*value).c_str());
}
if (peek() != '}')
expect(",");
type->items_.push_back(EnumVal{name, value});
}
append_type(type);
expect("}");
expect(";");
}
void Parser::parse_struct_or_union(bool is_struct)
{
in_struct_ = is_struct;
Token name = next();
if (!name.is_name())
ERROR(
"expecting struct/union name, got %s",
static_cast<std::string>(name).c_str());
UserType* type = new UserType{name, is_struct ? Struct : Union, {}, {}};
expect("{");
while (peek() != "}")
{
Decl* decl = parse_decl();
if (decl->attrs_ && !is_struct)
ERROR("attributes are not allowed for unions");
type->fields_.push_back(decl);
if (peek() != "}")
expect(";");
}
append_type(type);
check_size_count_decls(type->name_, type->fields_);
expect("}");
expect(";");
in_struct_ = false;
}
void Parser::parse_trusted()
{
expect("{");
while (peek() != '}')
{
bool is_private = true;
if (peek() == "public")
is_private = (next(), false);
append_function(trusted_funcs_, parse_function_decl(true));
if (is_private)
{
// Report error consistent with current edger8r.
// TODO: Report location.
fprintf(
stderr,
"error: Function '%s': 'private' specifier is not supported by "
"oeedger8r\n",
trusted_funcs_.back()->name_.c_str());
exit(1);
}
}
expect("}");
expect(";");
}
void Parser::parse_untrusted()
{
expect("{");
while (peek() != '}')
{
append_function(untrusted_funcs_, parse_function_decl(false));
}
expect("}");
expect(";");
}
void Parser::parse_allow_list(bool trusted, const std::string& fname)
{
if (!trusted)
{
if (peek() == "allow")
{
next();
expect("(");
while (peek() != ")")
{
Token t = next();
if (!t.is_name())
ERROR(
"expecting identifier, got %s",
static_cast<std::string>(t).c_str());
if (peek() != ")")
expect(",");
}
expect(")");
warn_allow_list(fname);
}
}
}
Function* Parser::parse_function_decl(bool trusted)
{
in_function_ = true;
Function* f = new Function{{}, {}, {}, false, false};
f->rtype_ = parse_atype();
Token name = next();
if (!name.is_name())
ERROR(
"expecting function name, got %s",
static_cast<std::string>(name).c_str());
f->name_ = name;
expect("(");
// Handle (void)
if (peek() == "void" && peek1() == ")")
next();
while (peek() != ')')
{
f->params_.push_back(parse_decl());
if (peek() != ')')
expect(",");
}
expect(")");
parse_allow_list(trusted, f->name_);
for (int i = 0; i < 2; ++i)
{
if (peek() == "transition_using_threads" && !f->switchless_)
{
next();
f->switchless_ = true;
}
else if (!trusted && peek() == "propagate_errno" && !f->errno_)
{
next();
f->errno_ = true;
}
}
expect(";");
warn_non_portable(f);
error_size_count(f);
check_size_count_decls(f->name_, f->params_);
check_deep_copy_struct_by_value(f);
in_function_ = false;
return f;
}
Decl* Parser::parse_decl()
{
Decl* decl = new Decl{{}, {}, {}, nullptr};
decl->attrs_ = parse_attributes();
decl->type_ = parse_atype();
Token name = next();
if (!name.is_name())
ERROR(
"expecting identifier got %s",
static_cast<std::string>(name).c_str());
decl->name_ = name;
decl->dims_ = parse_dims();
validate_attributes(decl);
return decl;
}
Parser::AttrTok Parser::check_attribute(Token t)
{
if (t == "in")
return TokIn;
if (t == "out")
return TokOut;
if (t == "count")
return TokCount;
if (t == "size")
return TokSize;
if (t == "isptr")
return TokIsPtr;
if (t == "isary")
return TokIsAry;
if (t == "string")
return TokString;
if (t == "wstring")
return TokWstring;
if (t == "user_check")
return TokUserCheck;
if (t == "sizefunc")
ERROR("The attribute 'sizefunc' is deprecated. Please use 'size' "
"attribute instead.");
ERROR("unknown attribute: `%s'", static_cast<std::string>(t).c_str());
// Unreachable
return TokIn;
}
Attrs* Parser::parse_attributes()
{
if (peek() != '[')
return nullptr;
next();
Attrs* attrs = new Attrs{false,
false,
false,
false,
false,
false,
false,
false,
false,
Token::empty(),
Token::empty()};
attr_toks_.clear();
do
{
Token t = next();
AttrTok atok = check_attribute(t);
// Only count and size attributes are valid for struct properties.
if (in_struct_ && (atok != TokCount && atok != TokSize))
ERROR("only `count' and `size' attributes can be specified for "
"struct properties");
// Check for duplicate specification.
for (auto&& itr : attr_toks_)
{
if (itr.first == atok)
ERROR(
"duplicated attribute: `%s'",
static_cast<std::string>(t).c_str());
}
attr_toks_.push_back(std::make_pair(atok, t));
// Process the attribute.
if (atok == TokCount || atok == TokSize)
{
expect("=");
Token v = next();
if (!v.is_name() && !v.is_int())
ERROR("expecting integer");
if (atok == TokCount)
attrs->count_ = v;
else
attrs->size_ = v;
}
else if (atok == TokUserCheck)
attrs->user_check_ = true;
else if (atok == TokIn)
*(attrs->out_ ? &attrs->inout_ : &attrs->in_) = true;
else if (atok == TokOut)
*(attrs->in_ ? &attrs->inout_ : &attrs->out_) = true;
else if (atok == TokString)
attrs->string_ = true;
else if (atok == TokWstring)
attrs->wstring_ = true;
else if (atok == TokIsPtr)
attrs->isptr_ = true;
else if (atok == TokIsAry)
attrs->isary_ = true;
else
ERROR(
"unexpected token `%s''", static_cast<std::string>(t).c_str());
// Check for sentinel.
if (peek() != ']')
expect(",");
} while (peek() != ']');
expect("]");
return attrs;
}
Type* Parser::parse_atype()
{
Token t = next();
bool const_ = false;
if (t == "const")
{
const_ = true;
t = next();
}
Type* type = parse_atype1(t);
if (!type)
type = parse_atype2(t);
if (!type)
ERROR(
"expecting typename, got %s", static_cast<std::string>(t).c_str());
if (const_)
type = new Type{Const, type, {}};
while (peek() == '*')
{
next();
type = new Type{Ptr, type, {}};
}
return type;
}
Type* Parser::parse_atype1(Token t)
{
Type* type = nullptr;
bool unsigned_ = false;
if (t == "unsigned")
{
unsigned_ = true;
Token p = peek();
if (p == "char" || p == "short" || p == "int" || p == "long")
t = next();
else
return new Type{Unsigned, new Type{Int, nullptr, {}}, {}};
}
if (t == "long")
{
Token p = peek();
if (p == "int")
(type = new Type{Long, nullptr, {}}, next());
else if (p == "long")
(type = new Type{LLong, nullptr, {}}, next());
else if (p == "double")
{
if (unsigned_)
ERROR("invalid double following unsigned");
(type = new Type{LDouble, nullptr, {}}, next());
}
else
type = new Type{Long, nullptr, {}};
}
else if (t == "short" || t == "char")
{
type = new Type{(t == "short") ? Short : Char, nullptr, {}};
if (peek() == "int")
next();
}
else if (t == "int")
type = new Type{Int, nullptr, {}};
if (unsigned_)
type = new Type{Unsigned, type, {}};
return type;
}
#define MATCH(str, tag) \
if (t == str) \
return new Type \
{ \
tag, nullptr, \
{ \
} \
}
Type* Parser::parse_atype2(Token t)
{
if (t == "struct" || t == "enum" || t == "union")
{
Token name = next();
if (!name.is_name())
ERROR(
"expecting struct/enum/union name, got %s",
static_cast<std::string>(name).c_str());
AType at = Struct;
if (t == "enum")
at = Enum;
else if (t == "union")
at = Union;
return new Type{at, nullptr, name};
}
MATCH("bool", Bool);
MATCH("void", Void);
MATCH("wchar_t", WChar);
MATCH("size_t", SizeT);
MATCH("int8_t", Int8);
MATCH("int16_t", Int16);
MATCH("int32_t", Int32);
MATCH("int64_t", Int64);
MATCH("uint8_t", UInt8);
MATCH("uint16_t", UInt16);
MATCH("uint32_t", UInt32);
MATCH("uint64_t", UInt64);
MATCH("float", Float);
MATCH("double", Double);
if (t.is_name())
return new Type{Foreign, {}, t};
return nullptr;
}
Dims* Parser::parse_dims()
{
if (peek() != '[')
return nullptr;
Dims* dims = new Dims();
while (peek() == '[')
{
next();
Token t = next();
if (!t.is_int() && !t.is_name())
ERROR(
"expecting array dimension, got %s",
static_cast<std::string>(t).c_str());
dims->push_back(t);
expect("]");
}
return dims;
}
void Parser::warn_allow_list(const std::string& fname)
{
fprintf(
stderr,
"Warning: Function '%s': Reentrant ocalls are not supported by "
"Open Enclave. Allow list ignored.\n",
fname.c_str());
}
void Parser::warn_non_portable(Function* f)
{
const char* fmt =
"Warning: Function '%s': %s has different sizes on Windows and "
"Linux. This enclave cannot be built in Linux and then safely "
"loaded in Windows.%s\n";
const char* suggestion = " Consider using uint64_t or uint32_t instead.";
for (Decl* p : f->params_)
{
Type* t = p->type_;
while (t->tag_ == Const || t->tag_ == Ptr)
t = t->t_;
if (t->tag_ == WChar)
fprintf(stderr, fmt, f->name_.c_str(), "wchar_t", "");
else if (t->tag_ == LDouble)
fprintf(stderr, fmt, f->name_.c_str(), "long double", "");
else if (t->tag_ == Long)
fprintf(stderr, fmt, f->name_.c_str(), "long", suggestion);
else if (t->tag_ == Unsigned && t->t_->tag_ == Long)
fprintf(stderr, fmt, f->name_.c_str(), "unsigned long", suggestion);
}
}
void Parser::error_size_count(Function* f)
{
for (Decl* p : f->params_)
{
if (p->attrs_ && !p->attrs_->size_.is_empty() &&
!p->attrs_->count_.is_empty())
{
fprintf(
stderr,
"error: Function '%s': simultaneous 'size' and 'count' "
"parameters 'size' and 'count' are not supported by "
"oeedger8r.",
f->name_.c_str());
exit(1);
}
}
}
static std::vector<Token> _get_size_or_count_attr_tokens(Decl* d)
{
std::vector<Token> tokens;
if (d->attrs_)
{
if (!d->attrs_->size_.is_empty())
tokens.push_back(d->attrs_->size_);
if (!d->attrs_->count_.is_empty())
tokens.push_back(d->attrs_->count_);
}
return tokens;
}
static Decl* _get_decl(const std::vector<Decl*>& decls, const std::string& name)
{
for (Decl* d : decls)
{
if (d->name_ == name)
return d;
}
return nullptr;
}
void Parser::check_size_count_decls(
const std::string& parent_name,
const std::vector<Decl*>& decls)
{
for (Decl* d : decls)
{
std::vector<Token> tokens = _get_size_or_count_attr_tokens(d);
for (Token& t : tokens)
{
if (t.is_empty() || !t.is_name())
continue;
Decl* sc_decl = _get_decl(decls, t);
if (sc_decl == nullptr)
ERROR_AT(
t,
"could not find declaration for '%s'.",
static_cast<std::string>(t).c_str());
/*
* Setting the is_size_or_count_ attribute for the user-defined
* struct only, which is relevant to the deep-copy support.
*/
if (in_struct_)
{
/*
* The struct member used by the size or count attribute will
* not have attrs_ during parse_attributes(). Allocate a new
* one.
*/
if (sc_decl->attrs_ == nullptr)
sc_decl->attrs_ = new Attrs{false,
false,
false,
false,
false,
false,
false,
false,
false,
Token::empty(),
Token::empty()};
/*
* We can only be sure if a struct member is used by the size or
* count attribute after parsing; i.e., we cannot decide it