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#include <string>
#include <libasr/config.h>
#include <libasr/serialization.h>
#include <libasr/asr_utils.h>
#include <libasr/asr_verify.h>
#include <libasr/bwriter.h>
#include <libasr/string_utils.h>
using LFortran::ASRUtils::symbol_parent_symtab;
using LFortran::ASRUtils::symbol_name;
namespace LFortran {
class ASRSerializationVisitor :
#ifdef WITH_LFORTRAN_BINARY_MODFILES
public BinaryWriter,
#else
public TextWriter,
#endif
public ASR::SerializationBaseVisitor<ASRSerializationVisitor>
{
public:
void write_bool(bool b) {
if (b) {
write_int8(1);
} else {
write_int8(0);
}
}
void write_symbol(const ASR::symbol_t &x) {
write_int64(symbol_parent_symtab(&x)->counter);
write_int8(x.type);
write_string(symbol_name(&x));
}
};
std::string serialize(const ASR::asr_t &asr) {
ASRSerializationVisitor v;
v.write_int8(asr.type);
v.visit_asr(asr);
return v.get_str();
}
std::string serialize(const ASR::TranslationUnit_t &unit) {
return serialize((ASR::asr_t&)(unit));
}
class ASRDeserializationVisitor :
#ifdef WITH_LFORTRAN_BINARY_MODFILES
public BinaryReader,
#else
public TextReader,
#endif
public ASR::DeserializationBaseVisitor<ASRDeserializationVisitor>
{
public:
ASRDeserializationVisitor(Allocator &al, const std::string &s,
bool load_symtab_id) :
#ifdef WITH_LFORTRAN_BINARY_MODFILES
BinaryReader(s),
#else
TextReader(s),
#endif
DeserializationBaseVisitor(al, load_symtab_id) {}
bool read_bool() {
uint8_t b = read_int8();
return (b == 1);
}
char* read_cstring() {
std::string s = read_string();
LFortran::Str cs;
cs.from_str_view(s);
char* p = cs.c_str(al);
return p;
}
// FIXME LOCATION: document if this is just initialization that will
// get overriden, or if this needs to be read from the file
// It seems we do not save/read location information, we need to fix it
#define READ_SYMBOL_CASE(x) \
case (ASR::symbolType::x) : { \
s = (ASR::symbol_t*)al.make_new<ASR::x##_t>(); \
s->type = ASR::symbolType::x; \
s->base.type = ASR::asrType::symbol; \
s->base.loc.first = 123; \
break; \
}
#define INSERT_SYMBOL_CASE(x) \
case (ASR::symbolType::x) : { \
memcpy(sym2, sym, sizeof(ASR::x##_t)); \
break; \
}
ASR::symbol_t *read_symbol() {
uint64_t symtab_id = read_int64();
uint64_t symbol_type = read_int8();
std::string symbol_name = read_string();
LFORTRAN_ASSERT(id_symtab_map.find(symtab_id) != id_symtab_map.end());
SymbolTable *symtab = id_symtab_map[symtab_id];
if (symtab->scope.find(symbol_name) == symtab->scope.end()) {
// Symbol is not in the symbol table yet. We construct an empty
// symbol of the correct type and put it in the symbol table.
// Later when constructing the symbol table, we will check for this
// and fill it in correctly.
ASR::symbolType ty = static_cast<ASR::symbolType>(symbol_type);
ASR::symbol_t *s;
switch (ty) {
READ_SYMBOL_CASE(Program)
READ_SYMBOL_CASE(Module)
READ_SYMBOL_CASE(Subroutine)
READ_SYMBOL_CASE(Function)
READ_SYMBOL_CASE(GenericProcedure)
READ_SYMBOL_CASE(ExternalSymbol)
READ_SYMBOL_CASE(DerivedType)
READ_SYMBOL_CASE(Variable)
READ_SYMBOL_CASE(ClassProcedure)
default : throw LFortranException("Symbol type not supported");
}
symtab->scope[symbol_name] = s;
}
ASR::symbol_t *sym = symtab->scope[symbol_name];
return sym;
}
void symtab_insert_symbol(SymbolTable &symtab, const std::string &name,
ASR::symbol_t *sym) {
if (symtab.scope.find(name) == symtab.scope.end()) {
symtab.scope[name] = sym;
} else {
// We have to copy the contents of `sym` into `sym2` without
// changing the `sym2` pointer already in the table
ASR::symbol_t *sym2 = symtab.scope[name];
// FIXME LOCATION: document what is going on:
LFORTRAN_ASSERT(sym2->base.loc.first == 123);
switch (sym->type) {
INSERT_SYMBOL_CASE(Program)
INSERT_SYMBOL_CASE(Module)
INSERT_SYMBOL_CASE(Subroutine)
INSERT_SYMBOL_CASE(Function)
INSERT_SYMBOL_CASE(GenericProcedure)
INSERT_SYMBOL_CASE(ExternalSymbol)
INSERT_SYMBOL_CASE(DerivedType)
INSERT_SYMBOL_CASE(Variable)
INSERT_SYMBOL_CASE(ClassProcedure)
default : throw LFortranException("Symbol type not supported");
}
}
}
};
namespace ASR {
class FixParentSymtabVisitor : public BaseWalkVisitor<FixParentSymtabVisitor>
{
private:
SymbolTable *current_symtab;
public:
void visit_TranslationUnit(const TranslationUnit_t &x) {
current_symtab = x.m_global_scope;
x.m_global_scope->asr_owner = (asr_t*)&x;
for (auto &a : x.m_global_scope->scope) {
this->visit_symbol(*a.second);
}
}
void visit_Program(const Program_t &x) {
SymbolTable *parent_symtab = current_symtab;
current_symtab = x.m_symtab;
x.m_symtab->parent = parent_symtab;
x.m_symtab->asr_owner = (asr_t*)&x;
for (auto &a : x.m_symtab->scope) {
this->visit_symbol(*a.second);
}
current_symtab = parent_symtab;
}
void visit_Module(const Module_t &x) {
SymbolTable *parent_symtab = current_symtab;
current_symtab = x.m_symtab;
x.m_symtab->parent = parent_symtab;
x.m_symtab->asr_owner = (asr_t*)&x;
for (auto &a : x.m_symtab->scope) {
this->visit_symbol(*a.second);
}
current_symtab = parent_symtab;
}
void visit_Subroutine(const Subroutine_t &x) {
SymbolTable *parent_symtab = current_symtab;
current_symtab = x.m_symtab;
x.m_symtab->parent = parent_symtab;
x.m_symtab->asr_owner = (asr_t*)&x;
for (auto &a : x.m_symtab->scope) {
this->visit_symbol(*a.second);
}
current_symtab = parent_symtab;
}
void visit_Function(const Function_t &x) {
SymbolTable *parent_symtab = current_symtab;
current_symtab = x.m_symtab;
x.m_symtab->parent = parent_symtab;
x.m_symtab->asr_owner = (asr_t*)&x;
for (auto &a : x.m_symtab->scope) {
this->visit_symbol(*a.second);
}
current_symtab = parent_symtab;
}
void visit_DerivedType(const DerivedType_t &x) {
SymbolTable *parent_symtab = current_symtab;
current_symtab = x.m_symtab;
x.m_symtab->parent = parent_symtab;
x.m_symtab->asr_owner = (asr_t*)&x;
for (auto &a : x.m_symtab->scope) {
this->visit_symbol(*a.second);
}
current_symtab = parent_symtab;
}
};
class FixExternalSymbolsVisitor : public BaseWalkVisitor<FixExternalSymbolsVisitor>
{
private:
SymbolTable *global_symtab;
SymbolTable *external_symtab;
public:
FixExternalSymbolsVisitor(SymbolTable &symtab) : external_symtab{&symtab} {}
void visit_TranslationUnit(const TranslationUnit_t &x) {
global_symtab = x.m_global_scope;
for (auto &a : x.m_global_scope->scope) {
this->visit_symbol(*a.second);
}
}
void visit_ExternalSymbol(const ExternalSymbol_t &x) {
if (x.m_external != nullptr) {
// Nothing to do, the external symbol is already resolved
return;
}
LFORTRAN_ASSERT(x.m_external == nullptr);
if (x.m_module_name == nullptr) {
throw LFortranException("The ExternalSymbol was referenced in some ASR node, but it was not loaded as part of the SymbolTable");
}
std::string module_name = x.m_module_name;
std::string original_name = x.m_original_name;
if (startswith(module_name, "lfortran_intrinsic_iso")) {
module_name = module_name.substr(19);
}
if (global_symtab->scope.find(module_name) != global_symtab->scope.end()) {
Module_t *m = down_cast<Module_t>(global_symtab->scope[module_name]);
symbol_t *sym = m->m_symtab->find_scoped_symbol(original_name, x.n_scope_names, x.m_scope_names);
if (sym) {
// FIXME: this is a hack, we need to pass in a non-const `x`.
ExternalSymbol_t &xx = const_cast<ExternalSymbol_t&>(x);
xx.m_external = sym;
} else {
throw LFortranException("ExternalSymbol cannot be resolved, the symbol '"
+ original_name + "' was not found in the module '"
+ module_name + "' (but the module was found)");
}
} else if (external_symtab->scope.find(module_name) != external_symtab->scope.end()) {
Module_t *m = down_cast<Module_t>(external_symtab->scope[module_name]);
symbol_t *sym = m->m_symtab->find_scoped_symbol(original_name, x.n_scope_names, x.m_scope_names);
if (sym) {
// FIXME: this is a hack, we need to pass in a non-const `x`.
ExternalSymbol_t &xx = const_cast<ExternalSymbol_t&>(x);
xx.m_external = sym;
} else {
throw LFortranException("ExternalSymbol cannot be resolved, the symbol '"
+ original_name + "' was not found in the module '"
+ module_name + "' (but the module was found)");
}
} else {
throw LFortranException("ExternalSymbol cannot be resolved, the module '"
+ module_name + "' was not found, so the symbol '"
+ original_name + "' could not be resolved");
}
}
};
} // namespace ASR
// Fix ExternalSymbol's symbol to point to symbols from `external_symtab`
// or from `unit`.
void fix_external_symbols(ASR::TranslationUnit_t &unit,
SymbolTable &external_symtab) {
ASR::FixExternalSymbolsVisitor e(external_symtab);
e.visit_TranslationUnit(unit);
}
ASR::asr_t* deserialize_asr(Allocator &al, const std::string &s,
bool load_symtab_id, SymbolTable &external_symtab) {
ASRDeserializationVisitor v(al, s, load_symtab_id);
ASR::asr_t *node = v.deserialize_node();
ASR::TranslationUnit_t *tu = ASR::down_cast2<ASR::TranslationUnit_t>(node);
// Connect the `parent` member of symbol tables
// Also set the `asr_owner` member correctly for all symbol tables
ASR::FixParentSymtabVisitor p;
p.visit_TranslationUnit(*tu);
LFORTRAN_ASSERT(asr_verify(*tu, false));
// Suppress a warning for now
if ((bool&)external_symtab) {}
return node;
}
} // namespace LFortran