lpython/src/libasr/serialization.cpp at type_checking · certik/lpython · GitHub

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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

lpython/src/libasr/serialization.cpp at type_checking · certik/lpython · GitHub

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