lpython/src/lpython/semantics/python_comptime_eval.h at main · salvo-polizzi/lpython · GitHub

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#ifndef LPYTHON_SEMANTICS_COMPTIME_EVAL_H

#define LPYTHON_SEMANTICS_COMPTIME_EVAL_H

#include <complex>

#include <string>

#include <cstring>

#include <cmath>

#include <sstream>

#include <algorithm>

#include <iterator>

#include <libasr/asr.h>

#include <lpython/bigint.h>

#include <libasr/string_utils.h>

#include <lpython/utils.h>

#include <lpython/semantics/semantic_exception.h>

#include <libasr/asr_utils.h>

namespace LCompilers::LPython {

struct ProceduresDatabase {

std::map<std::string, std::set<std::string>> to_be_ignored;

ProceduresDatabase() {

to_be_ignored = {{"numpy", {"empty", "int64", "int32",

"float32", "float64",

"reshape", "array", "int16",

"complex64", "complex128",

"int8", "exp", "exp2",

"uint8", "uint16", "uint32", "uint64",

"size", "bool_"}},

{"math", {"sin", "cos", "tan",

"asin", "acos", "atan",

"exp", "exp2", "expm1"}},

{"enum", {"Enum"}}

};

}

bool is_function_to_be_ignored(std::string& module_name,

std::string& function_name) {

if( to_be_ignored.find(module_name) == to_be_ignored.end() ) {

return false;

}

return to_be_ignored[module_name].find(function_name) != to_be_ignored[module_name].end();

}

};

struct PythonIntrinsicProcedures {

const std::string m_builtin = "lpython_builtin";

typedef ASR::expr_t* (*comptime_eval_callback)(Allocator &, const Location &, Vec<ASR::expr_t*> &);

// Table of intrinsics

// The callback is only called if all arguments have compile time `value`

// which is always one of the `Constant*` expression ASR nodes, so inside

// the callback one can assume that.

std::map<std::string, std::tuple<std::string, comptime_eval_callback>> comptime_eval_map;

PythonIntrinsicProcedures() {

comptime_eval_map = {

// {"abs", {m_builtin, &eval_abs}},

{"pow", {m_builtin, &eval_pow}},

{"round", {m_builtin, &eval_round}},

{"bin", {m_builtin, &eval_bin}},

{"hex", {m_builtin, &eval_hex}},

{"oct", {m_builtin, &eval_oct}},

{"list", {m_builtin, &eval_list}},

{"complex", {m_builtin, &eval_complex}},

{"_lpython_imag", {m_builtin, &eval__lpython_imag}},

{"divmod", {m_builtin, &eval_divmod}},

{"_lpython_floordiv", {m_builtin, &eval__lpython_floordiv}},

{"_mod", {m_builtin, &eval__mod}},

{"max" , {m_builtin , &eval_max}},

{"min" , {m_builtin , &eval_min}},

{"sum" , {m_builtin , &not_implemented}},

// The following functions for string methods are not used

// for evaluation.

{"_lpython_str_capitalize", {m_builtin, &not_implemented}},

{"_lpython_str_count", {m_builtin, &not_implemented}},

{"_lpython_str_lower", {m_builtin, &not_implemented}},

{"_lpython_str_upper", {m_builtin, &not_implemented}},

{"_lpython_str_join", {m_builtin, &not_implemented}},

{"_lpython_str_find", {m_builtin, &not_implemented}},

{"_lpython_str_isalpha", {m_builtin, &not_implemented}},

{"_lpython_str_title", {m_builtin, &not_implemented}},

{"_lpython_str_istitle", {m_builtin, &not_implemented}},

{"_lpython_str_rstrip", {m_builtin, &not_implemented}},

{"_lpython_str_lstrip", {m_builtin, &not_implemented}},

{"_lpython_str_strip", {m_builtin, &not_implemented}},

{"_lpython_str_split", {m_builtin, &not_implemented}},

{"_lpython_str_swapcase", {m_builtin, &not_implemented}},

{"_lpython_str_startswith", {m_builtin, &not_implemented}},

{"_lpython_str_endswith", {m_builtin, &not_implemented}},

{"_lpython_str_partition", {m_builtin, &not_implemented}},

{"_lpython_str_islower", {m_builtin, &not_implemented}},

{"_lpython_str_isupper", {m_builtin, &not_implemented}},

{"_lpython_str_isdecimal", {m_builtin, &not_implemented}},

{"_lpython_str_isascii", {m_builtin, &not_implemented}},

{"_lpython_str_isspace", {m_builtin, &not_implemented}}

};

}

// Return `true` if `name` is in the table of intrinsics

bool is_intrinsic(std::string name) const {

auto search = comptime_eval_map.find(name);

if (search != comptime_eval_map.end()) {

return true;

} else {

return false;

}

// Looks up `name` in the table of intrinsics and returns the corresponding

// module name; Otherwise rises an exception

std::string get_module(std::string name, const Location &loc) const {

auto search = comptime_eval_map.find(name);

if (search != comptime_eval_map.end()) {

std::string module_name = std::get<0>(search->second);

return module_name;

} else {

throw SemanticError("Function '" + name

+ "' not found among intrinsic procedures",

loc);

}

// Evaluates the intrinsic function `name` at compile time

ASR::expr_t *comptime_eval(std::string name, Allocator &al, const Location &loc, Vec<ASR::call_arg_t> &args) const {

auto search = comptime_eval_map.find(name);

if (search != comptime_eval_map.end()) {

comptime_eval_callback cb = std::get<1>(search->second);

Vec<ASR::call_arg_t> arg_values = ASRUtils::get_arg_values(al, args);

if (arg_values.size() != args.size()) {

// Not all arguments have compile time values; we do not call the callback

return nullptr;

}

Vec<ASR::expr_t*> expr_args;

expr_args.reserve(al, arg_values.size());

for( auto& a: arg_values ) {

expr_args.push_back(al, a.m_value);

}

return cb(al, loc, expr_args);

} else {

throw SemanticError("Intrinsic function '" + name

+ "' compile time evaluation is not implemented yet",

loc);

}

static ASR::expr_t *not_implemented(Allocator &/*al*/, const Location &/*loc*/,

Vec<ASR::expr_t*> &/*args*/) {

// This intrinsic is not evaluated at compile time yet.

return nullptr;

}

static ASR::expr_t *eval_str(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() == 0) { // create an empty string

ASR::ttype_t* str_type = ASRUtils::TYPE(ASR::make_Character_t(al, loc, 1, 0, nullptr));

return ASR::down_cast<ASR::expr_t>(ASR::make_StringConstant_t(al, loc, s2c(al, ""), str_type));

}

std::string s = "";

ASR::expr_t* arg = args[0];

ASR::ttype_t* arg_type = ASRUtils::expr_type(arg);

if (ASRUtils::is_integer(*arg_type)) {

int64_t ival = ASR::down_cast<ASR::IntegerConstant_t>(arg)->m_n;

s = std::to_string(ival);

} else if (ASRUtils::is_real(*arg_type)) {

double rval = ASR::down_cast<ASR::RealConstant_t>(arg)->m_r;

s = std::to_string(rval);

} else if (ASRUtils::is_logical(*arg_type)) {

bool rv = ASR::down_cast<ASR::LogicalConstant_t>(arg)->m_value;

s = rv ? "True" : "False";

} else if (ASRUtils::is_character(*arg_type)) {

char* c = ASR::down_cast<ASR::StringConstant_t>(arg)->m_s;

s = std::string(c);

} else {

throw SemanticError("str() argument must be real, integer, logical, or a string, not '" +

ASRUtils::type_to_str_python(arg_type) + "'", loc);

}

ASR::ttype_t* str_type = ASRUtils::TYPE(ASR::make_Character_t(al, loc, 1, s.size(), nullptr));

return ASR::down_cast<ASR::expr_t>(ASR::make_StringConstant_t(al, loc, s2c(al, s), str_type));

}

static ASR::expr_t *eval__mod(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() != 2) {

throw SemanticError("_mod() must have two integer/real arguments.", loc);

}

ASR::expr_t* arg1 = args[0], *arg2 = args[1];

LCOMPILERS_ASSERT(ASRUtils::check_equal_type(ASRUtils::expr_type(arg1),

ASRUtils::expr_type(arg2)));

ASR::ttype_t* type = ASRUtils::expr_type(arg1);

if (ASRUtils::is_integer(*type)) {

int64_t a = ASR::down_cast<ASR::IntegerConstant_t>(arg1)->m_n;

int64_t b = ASR::down_cast<ASR::IntegerConstant_t>(arg2)->m_n;

if(b == 0) { // Zero Division

throw SemanticError("Integer division or modulo by zero",loc);

}

// Refer the following link to understand how modulo in C++ is modified to behave like Python.

// https://stackoverflow.com/questions/1907565/c-and-python-different-behaviour-of-the-modulo-operation

return ASR::down_cast<ASR::expr_t>(

ASR::make_IntegerConstant_t(al, loc, ((a%b)+b)%b, type));

} else if (ASRUtils::is_real(*type)) {

double a = ASR::down_cast<ASR::RealConstant_t>(arg1)->m_r;

double b = ASR::down_cast<ASR::RealConstant_t>(arg2)->m_r;

if (b == 0) { // Zero Division

throw SemanticError("Float division or modulo by zero", loc);

}

// https://stackoverflow.com/questions/1907565/c-and-python-different-behaviour-of-the-modulo-operation

return ASR::down_cast<ASR::expr_t>(

ASR::make_RealConstant_t(al, loc, std::fmod(std::fmod(a, b) + b, b), type));

} else {

throw SemanticError("_mod() must have both integer or both real arguments.", loc);

}

static ASR::expr_t *eval_pow(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

ASR::expr_t* arg1 = args[0];

ASR::expr_t* arg2 = args[1];

ASR::ttype_t* arg1_type = ASRUtils::expr_type(arg1);

ASR::ttype_t* arg2_type = ASRUtils::expr_type(arg2);

int64_t mod_by = -1;

if (args.size() == 3) {

ASR::expr_t* arg3 = args[2];

ASR::ttype_t* arg3_type = ASRUtils::expr_type(arg3);

if (!ASRUtils::is_integer(*arg3_type) ) { // Zero Division

throw SemanticError("Third argument must be an integer. Found: " + \

ASRUtils::type_to_str_python(arg3_type), loc);

}

mod_by = ASR::down_cast<ASR::IntegerConstant_t>(arg3)->m_n;

}

ASR::ttype_t *int_type = ASRUtils::TYPE(ASR::make_Integer_t(al, loc, 4));

ASR::ttype_t *real_type = ASRUtils::TYPE(ASR::make_Real_t(al, loc, 8));

ASR::ttype_t *complex_type = ASRUtils::TYPE(ASR::make_Complex_t(al, loc, 8));

if (ASRUtils::is_integer(*arg1_type) && ASRUtils::is_integer(*arg2_type)) {

int64_t a = ASR::down_cast<ASR::IntegerConstant_t>(arg1)->m_n;

int64_t b = ASR::down_cast<ASR::IntegerConstant_t>(arg2)->m_n;

if (a == 0 && b < 0) { // Zero Division

throw SemanticError("0.0 cannot be raised to a negative power.", loc);

}

if (b < 0) // Negative power

return ASR::down_cast<ASR::expr_t>(make_RealConstant_t(al, loc,

pow(a, b), real_type));

else {// Positive power

if (mod_by == -1)

return ASR::down_cast<ASR::expr_t>(make_RealConstant_t(al, loc,

pow(a, b), real_type));

else {

int64_t res = (int64_t)pow(a, b);

return ASR::down_cast<ASR::expr_t>(make_RealConstant_t(al, loc,

(double) (res % mod_by), real_type));

}

} else if (ASRUtils::is_real(*arg1_type) && ASRUtils::is_real(*arg2_type)) {

double a = ASR::down_cast<ASR::RealConstant_t>(arg1)->m_r;

double b = ASR::down_cast<ASR::RealConstant_t>(arg2)->m_r;

if (a == 0.0 && b < 0.0) { // Zero Division

throw SemanticError("0.0 cannot be raised to a negative power.", loc);

}

return ASR::down_cast<ASR::expr_t>(make_RealConstant_t(al, loc,

pow(a, b), real_type));

} else if (ASRUtils::is_integer(*arg1_type) && ASRUtils::is_real(*arg2_type)) {

int64_t a = ASR::down_cast<ASR::IntegerConstant_t>(arg1)->m_n;

double b = ASR::down_cast<ASR::RealConstant_t>(arg2)->m_r;

if (a == 0 && b < 0.0) { // Zero Division

throw SemanticError("0.0 cannot be raised to a negative power.", loc);

}

return ASR::down_cast<ASR::expr_t>(make_RealConstant_t(al, loc,

pow(a, b), real_type));

} else if (ASRUtils::is_real(*arg1_type) && ASRUtils::is_integer(*arg2_type)) {

double a = ASR::down_cast<ASR::RealConstant_t>(arg1)->m_r;

int64_t b = ASR::down_cast<ASR::IntegerConstant_t>(arg2)->m_n;

if (a == 0.0 && b < 0) { // Zero Division

throw SemanticError("0.0 cannot be raised to a negative power.", loc);

}

return ASR::down_cast<ASR::expr_t>(make_RealConstant_t(al, loc,

pow(a, b), real_type));

} else if (ASRUtils::is_logical(*arg1_type) && ASRUtils::is_logical(*arg2_type)) {

bool a = ASR::down_cast<ASR::LogicalConstant_t>(arg1)->m_value;

bool b = ASR::down_cast<ASR::LogicalConstant_t>(arg2)->m_value;

return ASR::down_cast<ASR::expr_t>(make_IntegerConstant_t(al, loc,

pow(a, b), int_type));

} else if (ASRUtils::is_complex(*arg1_type) && ASRUtils::is_integer(*arg2_type)) {

double re = ASR::down_cast<ASR::ComplexConstant_t>(arg1)->m_re;

double im = ASR::down_cast<ASR::ComplexConstant_t>(arg1)->m_im;

std::complex<double> x(re, im);

int64_t b = ASR::down_cast<ASR::IntegerConstant_t>(arg2)->m_n;

std::complex<double> y = pow(x, b);

return ASR::down_cast<ASR::expr_t>(make_ComplexConstant_t(al, loc,

y.real(), y.imag(), complex_type));

} else {

throw SemanticError("pow() only works on integer, real, logical, and complex types", loc);

}

static ASR::expr_t *eval_bin(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() != 1) {

throw SemanticError("bin() takes exactly one argument (" +

std::to_string(args.size()) + " given)", loc);

}

ASR::expr_t* expr = args[0];

ASR::ttype_t* type = ASRUtils::expr_type(expr);

if (ASRUtils::is_integer(*type)) {

int64_t n = ASR::down_cast<ASR::IntegerConstant_t>(expr)->m_n;

std::string str, prefix;

prefix = n > 0 ? "0b" : "-0b";

str += std::bitset<64>(std::abs(n)).to_string();

str.erase(0, str.find_first_not_of('0'));

str.insert(0, prefix);

ASR::ttype_t* str_type = ASRUtils::TYPE(ASR::make_Character_t(al, loc, 1, str.size(), nullptr));

return ASR::down_cast<ASR::expr_t>(make_StringConstant_t(al, loc, s2c(al, str), str_type));

} else {

throw SemanticError("bin() argument must be an integer, not '" +

ASRUtils::type_to_str_python(type) + "'", loc);

}

static ASR::expr_t *eval_hex(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() != 1) {

throw SemanticError("hex() takes exactly one argument (" +

std::to_string(args.size()) + " given)", loc);

}

ASR::expr_t* expr = args[0];

ASR::ttype_t* type = ASRUtils::expr_type(expr);

if (ASRUtils::is_integer(*type)) {

int64_t n = ASR::down_cast<ASR::IntegerConstant_t>(expr)->m_n;

std::string str, prefix;

std::stringstream ss;

prefix = n > 0 ? "0x" : "-0x";

ss << std::hex << std::abs(n);

str += ss.str();

str.insert(0, prefix);

ASR::ttype_t* str_type = ASRUtils::TYPE(ASR::make_Character_t(al, loc, 1, str.size(), nullptr));

return ASR::down_cast<ASR::expr_t>(make_StringConstant_t(al, loc, s2c(al, str), str_type));

} else {

throw SemanticError("hex() argument must be an integer, not '" +

ASRUtils::type_to_str_python(type) + "'", loc);

}

static ASR::expr_t *eval_oct(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() != 1) {

throw SemanticError("oct() takes exactly one argument (" +

std::to_string(args.size()) + " given)", loc);

}

ASR::expr_t* expr = args[0];

ASR::ttype_t* type = ASRUtils::expr_type(expr);

if (ASRUtils::is_integer(*type)) {

int64_t n = ASR::down_cast<ASR::IntegerConstant_t>(expr)->m_n;

std::string str, prefix;

std::stringstream ss;

prefix = n > 0 ? "0o" : "-0o";

ss << std::oct << std::abs(n);

str += ss.str();

str.insert(0, prefix);

ASR::ttype_t* str_type = ASRUtils::TYPE(ASR::make_Character_t(al, loc, 1, str.size(), nullptr));

return ASR::down_cast<ASR::expr_t>(make_StringConstant_t(al, loc, s2c(al, str), str_type));

} else {

throw SemanticError("oct() argument must be an integer, not '" +

ASRUtils::type_to_str_python(type) + "'", loc);

}

static ASR::expr_t *eval_list(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() > 1) {

throw SemanticError("list() takes 0 or 1 argument (" +

std::to_string(args.size()) + " given)", loc);

}

LCOMPILERS_ASSERT(args.size()==1);

ASR::expr_t *arg = args[0];

ASR::ttype_t *type = ASRUtils::expr_type(arg);

ASR::ttype_t* str_type = ASRUtils::TYPE(ASR::make_Character_t(al, loc, 1, 1, nullptr));

if (ASRUtils::is_integer(*type) || ASRUtils::is_real(*type)

|| ASRUtils::is_complex(*type) || ASRUtils::is_logical(*type)) {

throw SemanticError("Integer, Real, Complex and Boolean are not iterable "

"and cannot be converted to List", loc);

} else if (ASR::is_a<ASR::List_t>(*type)) {

return arg;

} else if (ASRUtils::is_character(*type)) {

ASR::ttype_t *list_type = ASRUtils::TYPE(ASR::make_List_t(al, loc, str_type));

LCOMPILERS_ASSERT(ASRUtils::expr_value(arg) != nullptr)

std::string c = ASR::down_cast<ASR::StringConstant_t>(arg)->m_s;

Vec<ASR::expr_t*> list;

list.reserve(al, c.length());

std::string r;

for (size_t i=0; i<c.length(); i++) {

r.push_back(char(c[i]));

list.push_back(al, ASR::down_cast<ASR::expr_t>(

ASR::make_StringConstant_t(al, loc, s2c(al, r),

str_type)));

r.pop_back();

}

return ASR::down_cast<ASR::expr_t>(ASR::make_ListConstant_t(al, loc, list.p,

list.size(), list_type));

} else {

throw SemanticError("'" + ASRUtils::type_to_str_python(type) +

"' object conversion to List is not implemented ",

arg->base.loc);

}

static ASR::expr_t *eval_round(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

ASR::ttype_t *type = ASRUtils::TYPE(ASR::make_Integer_t(al, loc, 4));

if (args.size() != 1) {

throw SemanticError("round() missing required argument 'number' (pos 1)", loc);

}

ASR::expr_t* expr = args[0];

ASR::ttype_t* t = ASRUtils::expr_type(expr);

if (ASRUtils::is_real(*t)) {

double rv = ASR::down_cast<ASR::RealConstant_t>(expr)->m_r;

int64_t rounded = round(rv);

if (fabs(rv-rounded) == 0.5)

rounded = 2.0*round(rv/2.0);

return ASR::down_cast<ASR::expr_t>(make_IntegerConstant_t(al, loc, rounded, type));

} else if (ASRUtils::is_integer(*t)) {

int64_t rv = ASR::down_cast<ASR::IntegerConstant_t>(expr)->m_n;

return ASR::down_cast<ASR::expr_t>(make_IntegerConstant_t(al, loc, rv, type));

} else if (ASRUtils::is_logical(*t)) {

int64_t rv = ASR::down_cast<ASR::LogicalConstant_t>(expr)->m_value;

return ASR::down_cast<ASR::expr_t>(make_IntegerConstant_t(al, loc, rv, type));

} else {

throw SemanticError("round() argument must be float, integer, or logical for now, not '" +

ASRUtils::type_to_str_python(t) + "'", loc);

}

static ASR::expr_t *eval_complex(Allocator &al, const Location &loc, Vec<ASR::expr_t*> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

int16_t n_args = args.size();

ASR::ttype_t *type = ASRUtils::TYPE(ASR::make_Complex_t(al, loc, 8));

if( n_args > 2 || n_args < 0 ) { // n_args shouldn't be less than 0 but added this check for safety

throw SemanticError("Only constant integer or real values are supported as "

"the (at most two) arguments of complex()", loc);

}

double c1 = 0.0, c2 = 0.0; // Default if n_args = 0

if (n_args >= 1) { // Handles both n_args = 1 and n_args = 2

if (ASR::is_a<ASR::IntegerConstant_t>(*args[0])) {

c1 = ASR::down_cast<ASR::IntegerConstant_t>(args[0])->m_n;

} else if (ASR::is_a<ASR::RealConstant_t>(*args[0])) {

c1 = ASR::down_cast<ASR::RealConstant_t>(args[0])->m_r;

}

if (n_args == 2) { // Extracts imaginary component if n_args = 2

if (ASR::is_a<ASR::IntegerConstant_t>(*args[1])) {

c2 = ASR::down_cast<ASR::IntegerConstant_t>(args[1])->m_n;

} else if (ASR::is_a<ASR::RealConstant_t>(*args[1])) {

c2 = ASR::down_cast<ASR::RealConstant_t>(args[1])->m_r;

}

return ASR::down_cast<ASR::expr_t>(make_ComplexConstant_t(al, loc, c1, c2, type));

}

static ASR::expr_t *eval__lpython_imag(Allocator &al, const Location &loc,

Vec<ASR::expr_t*> &args

) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() != 1) {

throw SemanticError("Intrinsic _lpython_imag function accepts exactly 1 argument", loc);

}

ASR::expr_t* imag_arg = args[0];

ASR::ttype_t *type = ASRUtils::TYPE(ASR::make_Real_t(al, loc, 8));

if (ASR::is_a<ASR::Complex_t>(*ASRUtils::expr_type(imag_arg))) {

double im = ASR::down_cast<ASR::ComplexConstant_t>(imag_arg)->m_im;

double result = im;

return ASR::down_cast<ASR::expr_t>(ASR::make_RealConstant_t(al, loc, result, type));

} else {

throw SemanticError("Argument of the _lpython_imag() function must be Complex", loc);

}

static ASR::expr_t *eval__lpython_floordiv(Allocator &al, const Location &loc, Vec<ASR::expr_t *> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() != 2) {

throw SemanticError("_lpython_floordiv() takes exactly two arguments (" +

std::to_string(args.size()) + " given)", loc);

}

ASR::expr_t *arg1 = args[0];

ASR::expr_t *arg2 = args[1];

ASR::ttype_t *arg1_type = ASRUtils::expr_type(arg1);

ASR::ttype_t *arg2_type = ASRUtils::expr_type(arg2);

if (ASRUtils::is_real(*arg1_type) && ASRUtils::is_real(*arg2_type)) {

int kind = ASRUtils::extract_kind_from_ttype_t(arg1_type);

ASR::ttype_t *type = nullptr;

if (kind == 8) {

type = ASRUtils::TYPE(ASR::make_Real_t(al, loc, 8));

} else {

type = ASRUtils::TYPE(ASR::make_Real_t(al, loc, 4));

}

double n = ASR::down_cast<ASR::RealConstant_t>(arg1)->m_r;

double d = ASR::down_cast<ASR::RealConstant_t>(arg2)->m_r;

double r = n/d, res = 0.0;

int64_t ival = (int64_t)r;

if (r > 0 || ival == r) {

res = ival;

} else {

res = ival-1;

}

return ASR::down_cast<ASR::expr_t>(make_RealConstant_t(al, loc, res, type));

} else if (ASRUtils::is_integer(*arg1_type) && ASRUtils::is_integer(*arg2_type)) {

int kind = ASRUtils::extract_kind_from_ttype_t(arg1_type);

ASR::ttype_t *type = nullptr;

if (kind == 8) {

type = ASRUtils::TYPE(ASR::make_Integer_t(al, loc, 8));

} else {

type = ASRUtils::TYPE(ASR::make_Integer_t(al, loc, 4));

}

int64_t n = ASR::down_cast<ASR::IntegerConstant_t>(arg1)->m_n;

int64_t d = ASR::down_cast<ASR::IntegerConstant_t>(arg2)->m_n;

int64_t res = 0;

double r = 1.0*n/d;

int64_t ival = (int64_t)r;

if (r > 0 || ival == r) {

res = ival;

} else {

res = ival-1;

}

return ASR::down_cast<ASR::expr_t>(make_IntegerConstant_t(al, loc, res, type));

} else if (ASRUtils::is_logical(*arg1_type) && ASRUtils::is_logical(*arg2_type)) {

ASR::ttype_t *type = ASRUtils::TYPE(ASR::make_Logical_t(al, loc, 1));

bool n = false, d = false;

ASRUtils::extract_value(arg1, n);

ASRUtils::extract_value(arg2, d);

if( !d ) {

throw SemanticError("Denominator cannot be False or 0.", arg2->base.loc);

}

return ASR::down_cast<ASR::expr_t>(make_LogicalConstant_t(al, loc, n, type));

} else {

throw SemanticError("Only real/integers/logical arguments are expected.", loc);

}

static ASR::expr_t *eval_divmod(Allocator &al, const Location &loc, Vec<ASR::expr_t *> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

if (args.size() != 2) {

throw SemanticError("divmod() takes exactly two arguments (" +

std::to_string(args.size()) + " given)", loc);

}

ASR::expr_t *arg1 = args[0];

ASR::expr_t *arg2 = args[1];

ASR::ttype_t *arg1_type = ASRUtils::expr_type(arg1);

ASR::ttype_t *arg2_type = ASRUtils::expr_type(arg2);

Vec<ASR::expr_t *> tuple; // pair consisting of quotient and remainder

tuple.reserve(al, 2);

Vec<ASR::ttype_t *> tuple_type_vec;

tuple_type_vec.reserve(al, 2);

if (ASRUtils::is_integer(*arg1_type) && ASRUtils::is_integer(*arg2_type)) {

int64_t ival1 = ASR::down_cast<ASR::IntegerConstant_t>(arg1)->m_n;

int64_t ival2 = ASR::down_cast<ASR::IntegerConstant_t>(arg2)->m_n;

if (ival2 == 0) {

throw SemanticError("Integer division or modulo by zero not possible", loc);

} else {

int64_t div = ival1 / ival2;

int64_t mod = ival1 % ival2;

tuple.push_back(al, ASRUtils::EXPR(

ASR::make_IntegerConstant_t(al, loc, div, arg1_type)));

tuple.push_back(al, ASRUtils::EXPR(

ASR::make_IntegerConstant_t(al, loc, mod, arg1_type)));

tuple_type_vec.push_back(al, arg1_type);

tuple_type_vec.push_back(al, arg2_type);

ASR::ttype_t *tuple_type = ASRUtils::TYPE(ASR::make_Tuple_t(al, loc,

tuple_type_vec.p, tuple_type_vec.n));

return ASR::down_cast<ASR::expr_t>(make_TupleConstant_t(al, loc, tuple.p, tuple.size(), tuple_type));

}

} else {

throw SemanticError("Both arguments of divmod() must be integers for now, not '" +

ASRUtils::type_to_str_python(arg1_type) + "' and '" + ASRUtils::type_to_str_python(arg2_type) + "'", loc);

}

static ASR::expr_t *eval_max(Allocator &/*al*/, const Location &loc, Vec<ASR::expr_t *> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

bool semantic_error_flag = args.size() != 0;

std::string msg = "max() takes many arguments to comparing";

ASR::expr_t *first_element = args[0];

ASR::ttype_t *first_element_type = ASRUtils::expr_type(first_element);

semantic_error_flag &= ASRUtils::is_integer(*first_element_type)

|| ASRUtils::is_real(*first_element_type)

|| ASRUtils::is_character(*first_element_type);

int32_t biggest_ind = 0;

if (semantic_error_flag) {

if (ASRUtils::is_integer(*first_element_type)) {

int32_t biggest = 0;

for (size_t i = 0; i < args.size() && semantic_error_flag; i++) {

ASR::expr_t *current_arg = args[i];

ASR::ttype_t *current_arg_type = ASRUtils::expr_type(current_arg);

semantic_error_flag &= current_arg_type->type == first_element_type->type;

if (!semantic_error_flag) {

msg = "type of arg in index [" + std::to_string(i) = "] is not comparable";

break;

}

int32_t current_val = ASR::down_cast<ASR::IntegerConstant_t>(current_arg)->m_n;

if (i == 0) {

biggest = current_val;

biggest_ind = 0;

} else {

if (current_val > biggest) {

biggest = current_val;

biggest_ind = i;

}

if (semantic_error_flag) {

return args[biggest_ind];

}

} else if (ASRUtils::is_real(*first_element_type)) {

double_t biggest = 0;

for (size_t i = 0; i < args.size() && semantic_error_flag; i++) {

ASR::expr_t *current_arg = args[i];

ASR::ttype_t *current_arg_type = ASRUtils::expr_type(current_arg);

semantic_error_flag &= current_arg_type->type == first_element_type->type;

if (!semantic_error_flag) {

msg = "type of arg in index [" + std::to_string(i) = "] is not comparable";

break;

}

double_t current_val = ASR::down_cast<ASR::RealConstant_t>(current_arg)->m_r;

if (i == 0) {

biggest = current_val;

biggest_ind = 0;

} else {

if (current_val - biggest > 1e-6) {

biggest = current_val;

biggest_ind = i;

}

if (semantic_error_flag) {

return args[biggest_ind];

}

throw SemanticError(msg, loc);

}

static ASR::expr_t *eval_min(Allocator &/*al*/, const Location &loc, Vec<ASR::expr_t *> &args) {

LCOMPILERS_ASSERT(ASRUtils::all_args_evaluated(args));

bool semantic_error_flag = args.size() != 0;

std::string msg = "min() takes many arguments to comparing";

ASR::expr_t *first_element = args[0];

ASR::ttype_t *first_element_type = ASRUtils::expr_type(first_element);

semantic_error_flag &= ASRUtils::is_integer(*first_element_type)

|| ASRUtils::is_real(*first_element_type)

|| ASRUtils::is_character(*first_element_type);

int32_t smallest_ind = 0;

if (semantic_error_flag) {

if (ASRUtils::is_integer(*first_element_type)) {

int32_t smallest = 0;

for (size_t i = 0; i < args.size() && semantic_error_flag; i++) {

ASR::expr_t *current_arg = args[i];

ASR::ttype_t *current_arg_type = ASRUtils::expr_type(current_arg);

semantic_error_flag &= current_arg_type->type == first_element_type->type;

if (!semantic_error_flag) {

msg = "type of arg in index [" + std::to_string(i) = "] is not comparable";

break;

}

int32_t current_val = ASR::down_cast<ASR::IntegerConstant_t>(current_arg)->m_n;

if (i == 0) {

smallest = current_val;

smallest_ind = 0;

} else {

if (current_val < smallest) {

smallest = current_val;

smallest_ind = i;

}

if (semantic_error_flag) {

return args[smallest_ind];

}

} else if (ASRUtils::is_real(*first_element_type)) {

double_t smallest = 0;

for (size_t i = 0; i < args.size() && semantic_error_flag; i++) {

ASR::expr_t *current_arg = args[i];

ASR::ttype_t *current_arg_type = ASRUtils::expr_type(current_arg);

semantic_error_flag &= current_arg_type->type == first_element_type->type;

if (!semantic_error_flag) {

msg = "type of arg in index [" + std::to_string(i) = "] is not comparable";

break;

}

double_t current_val = ASR::down_cast<ASR::RealConstant_t>(current_arg)->m_r;

if (i == 0) {

smallest = current_val;

smallest_ind = 0;

} else {

if (smallest - current_val > 1e-6) {

smallest = current_val;

smallest_ind = i;

}

if (semantic_error_flag) {

return args[smallest_ind];

}

throw SemanticError(msg, loc);

}

}; // ComptimeEval

} // namespace LCompilers::LPython

#endif /* LPYTHON_SEMANTICS_COMPTIME_EVAL_H */

lpython/src/lpython/semantics/python_comptime_eval.h at main · salvo-polizzi/lpython · GitHub

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