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builtins.cpp
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/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2020 Telegram Systems LLP
*/
#include "func.h"
namespace funC {
using namespace std::literals::string_literals;
/*
*
* SYMBOL VALUES
*
*/
int stdlib_glob_func_cnt, glob_func_cnt, undef_func_cnt, glob_var_cnt, const_cnt;
std::vector<SymDef*> stdlib_glob_func, glob_func, glob_vars;
std::set<std::string> prohibited_var_names;
void reset_builtins() {
glob_func_cnt = undef_func_cnt = glob_var_cnt = const_cnt = 0;
glob_func.clear();
glob_vars.clear();
prohibited_var_names.clear();
}
SymDef* predefine_builtin_func(std::string name, TypeExpr* func_type) {
if (name.back() == '_') {
prohibited_var_names.insert(name);
}
sym_idx_t name_idx = sym::symbols.lookup(name, 1);
if (sym::symbols.is_keyword(name_idx)) {
std::cerr << "fatal: global function `" << name << "` already defined as a keyword" << std::endl;
}
SymDef* def = sym::define_global_symbol(name_idx, true);
if (!def) {
std::cerr << "fatal: global function `" << name << "` already defined" << std::endl;
std::exit(1);
}
return def;
}
template <typename T>
SymDef* define_builtin_func(std::string name, TypeExpr* func_type, const T& func, bool impure = false) {
SymDef* def = predefine_builtin_func(name, func_type);
def->value = new SymValAsmFunc{func_type, func, impure};
return def;
}
template <typename T>
SymDef* define_builtin_func(std::string name, TypeExpr* func_type, const T& func, std::initializer_list<int> arg_order,
std::initializer_list<int> ret_order = {}, bool impure = false) {
SymDef* def = predefine_builtin_func(name, func_type);
def->value = new SymValAsmFunc{func_type, func, arg_order, ret_order, impure};
return def;
}
SymDef* define_builtin_func(std::string name, TypeExpr* func_type, const AsmOp& macro,
std::initializer_list<int> arg_order, std::initializer_list<int> ret_order = {},
bool impure = false) {
SymDef* def = predefine_builtin_func(name, func_type);
def->value = new SymValAsmFunc{func_type, make_simple_compile(macro), arg_order, ret_order, impure};
return def;
}
SymDef* force_autoapply(SymDef* def) {
if (def) {
auto val = dynamic_cast<SymVal*>(def->value);
if (val) {
val->auto_apply = true;
}
}
return def;
}
template <typename... Args>
SymDef* define_builtin_const(std::string name, TypeExpr* const_type, Args&&... args) {
return force_autoapply(
define_builtin_func(name, TypeExpr::new_map(TypeExpr::new_unit(), const_type), std::forward<Args>(args)...));
}
bool SymValAsmFunc::compile(AsmOpList& dest, std::vector<VarDescr>& out, std::vector<VarDescr>& in,
const SrcLocation& where) const {
if (simple_compile) {
return dest.append(simple_compile(out, in, where));
} else if (ext_compile) {
return ext_compile(dest, out, in);
} else {
return false;
}
}
/*
*
* DEFINE BUILT-IN FUNCTIONS
*
*/
int emulate_negate(int a) {
int f = VarDescr::_Pos | VarDescr::_Neg;
if ((a & f) && (~a & f)) {
a ^= f;
}
f = VarDescr::_Bit | VarDescr::_Bool;
if ((a & f) && (~a & f)) {
a ^= f;
}
return a;
}
int emulate_add(int a, int b) {
if (b & VarDescr::_Zero) {
return a;
} else if (a & VarDescr::_Zero) {
return b;
}
int u = a & b, v = a | b;
int r = VarDescr::_Int;
int t = u & (VarDescr::_Pos | VarDescr::_Neg);
if (v & VarDescr::_Nan) {
return r | VarDescr::_Nan;
}
// non-quiet addition always returns finite results!
r |= t | VarDescr::_Finite;
if (t) {
r |= v & VarDescr::_NonZero;
}
r |= v & VarDescr::_Nan;
if (u & (VarDescr::_Odd | VarDescr::_Even)) {
r |= VarDescr::_Even;
} else if (!(~v & (VarDescr::_Odd | VarDescr::_Even))) {
r |= VarDescr::_Odd | VarDescr::_NonZero;
}
return r;
}
int emulate_sub(int a, int b) {
return emulate_add(a, emulate_negate(b));
}
int emulate_mul(int a, int b) {
if ((b & (VarDescr::_NonZero | VarDescr::_Bit)) == (VarDescr::_NonZero | VarDescr::_Bit)) {
return a;
} else if ((a & (VarDescr::_NonZero | VarDescr::_Bit)) == (VarDescr::_NonZero | VarDescr::_Bit)) {
return b;
}
int u = a & b, v = a | b;
int r = VarDescr::_Int;
if (v & VarDescr::_Nan) {
return r | VarDescr::_Nan;
}
// non-quiet multiplication always yields finite results, if any
r |= VarDescr::_Finite;
if (v & VarDescr::_Zero) {
// non-quiet multiplication
// the result is zero, if any result at all
return VarDescr::ConstZero;
}
if (u & (VarDescr::_Pos | VarDescr::_Neg)) {
r |= VarDescr::_Pos;
} else if (!(~v & (VarDescr::_Pos | VarDescr::_Neg))) {
r |= VarDescr::_Neg;
}
if (u & (VarDescr::_Bit | VarDescr::_Bool)) {
r |= VarDescr::_Bit;
} else if (!(~v & (VarDescr::_Bit | VarDescr::_Bool))) {
r |= VarDescr::_Bool;
}
r |= v & VarDescr::_Even;
r |= u & (VarDescr::_Odd | VarDescr::_NonZero);
return r;
}
int emulate_and(int a, int b) {
int both = a & b, any = a | b;
int r = VarDescr::_Int;
if (any & VarDescr::_Nan) {
return r | VarDescr::_Nan;
}
r |= VarDescr::_Finite;
if (any & VarDescr::_Zero) {
return VarDescr::ConstZero;
}
r |= both & (VarDescr::_Even | VarDescr::_Odd);
r |= both & (VarDescr::_Bit | VarDescr::_Bool);
if (both & VarDescr::_Odd) {
r |= VarDescr::_NonZero;
}
return r;
}
int emulate_or(int a, int b) {
if (b & VarDescr::_Zero) {
return a;
} else if (a & VarDescr::_Zero) {
return b;
}
int both = a & b, any = a | b;
int r = VarDescr::_Int;
if (any & VarDescr::_Nan) {
return r | VarDescr::_Nan;
}
r |= VarDescr::_Finite;
r |= any & VarDescr::_NonZero;
r |= any & VarDescr::_Odd;
r |= both & VarDescr::_Even;
return r;
}
int emulate_xor(int a, int b) {
if (b & VarDescr::_Zero) {
return a;
} else if (a & VarDescr::_Zero) {
return b;
}
int both = a & b, any = a | b;
int r = VarDescr::_Int;
if (any & VarDescr::_Nan) {
return r | VarDescr::_Nan;
}
r |= VarDescr::_Finite;
r |= both & VarDescr::_Even;
if (both & VarDescr::_Odd) {
r |= VarDescr::_Even;
}
return r;
}
int emulate_not(int a) {
if ((a & VarDescr::ConstZero) == VarDescr::ConstZero) {
return VarDescr::ConstTrue;
}
if ((a & VarDescr::ConstTrue) == VarDescr::ConstTrue) {
return VarDescr::ConstZero;
}
int a2 = a;
int f = VarDescr::_Even | VarDescr::_Odd;
if ((a2 & f) && (~a2 & f)) {
a2 ^= f;
}
a2 &= ~(VarDescr::_Zero | VarDescr::_NonZero | VarDescr::_Bit | VarDescr::_Pos | VarDescr::_Neg);
if ((a & VarDescr::_Neg) && (a & VarDescr::_NonZero)) {
a2 |= VarDescr::_Pos;
}
if (a & VarDescr::_Pos) {
a2 |= VarDescr::_Neg;
}
return a2;
}
int emulate_lshift(int a, int b) {
if (((a | b) & VarDescr::_Nan) || !(~b & (VarDescr::_Neg | VarDescr::_NonZero))) {
return VarDescr::_Int | VarDescr::_Nan;
}
if (b & VarDescr::_Zero) {
return a;
}
int t = ((b & VarDescr::_NonZero) ? VarDescr::_Even : 0);
t |= b & VarDescr::_Finite;
return emulate_mul(a, VarDescr::_Int | VarDescr::_Pos | VarDescr::_NonZero | t);
}
int emulate_div(int a, int b) {
if ((b & (VarDescr::_NonZero | VarDescr::_Bit)) == (VarDescr::_NonZero | VarDescr::_Bit)) {
return a;
} else if ((b & (VarDescr::_NonZero | VarDescr::_Bool)) == (VarDescr::_NonZero | VarDescr::_Bool)) {
return emulate_negate(a);
}
if (b & VarDescr::_Zero) {
return VarDescr::_Int | VarDescr::_Nan;
}
int u = a & b, v = a | b;
int r = VarDescr::_Int;
if (v & VarDescr::_Nan) {
return r | VarDescr::_Nan;
}
// non-quiet division always yields finite results, if any
r |= VarDescr::_Finite;
if (a & VarDescr::_Zero) {
// non-quiet division
// the result is zero, if any result at all
return VarDescr::ConstZero;
}
if (u & (VarDescr::_Pos | VarDescr::_Neg)) {
r |= VarDescr::_Pos;
} else if (!(~v & (VarDescr::_Pos | VarDescr::_Neg))) {
r |= VarDescr::_Neg;
}
if (u & (VarDescr::_Bit | VarDescr::_Bool)) {
r |= VarDescr::_Bit;
} else if (!(~v & (VarDescr::_Bit | VarDescr::_Bool))) {
r |= VarDescr::_Bool;
}
return r;
}
int emulate_rshift(int a, int b) {
if (((a | b) & VarDescr::_Nan) || !(~b & (VarDescr::_Neg | VarDescr::_NonZero))) {
return VarDescr::_Int | VarDescr::_Nan;
}
if (b & VarDescr::_Zero) {
return a;
}
int t = ((b & VarDescr::_NonZero) ? VarDescr::_Even : 0);
t |= b & VarDescr::_Finite;
return emulate_div(a, VarDescr::_Int | VarDescr::_Pos | VarDescr::_NonZero | t);
}
int emulate_mod(int a, int b, int round_mode = -1) {
if ((b & (VarDescr::_NonZero | VarDescr::_Bit)) == (VarDescr::_NonZero | VarDescr::_Bit)) {
return VarDescr::ConstZero;
} else if ((b & (VarDescr::_NonZero | VarDescr::_Bool)) == (VarDescr::_NonZero | VarDescr::_Bool)) {
return VarDescr::ConstZero;
}
if (b & VarDescr::_Zero) {
return VarDescr::_Int | VarDescr::_Nan;
}
int r = VarDescr::_Int;
if ((a | b) & VarDescr::_Nan) {
return r | VarDescr::_Nan;
}
// non-quiet division always yields finite results, if any
r |= VarDescr::_Finite;
if (a & VarDescr::_Zero) {
// non-quiet division
// the result is zero, if any result at all
return VarDescr::ConstZero;
}
if (round_mode < 0) {
r |= b & (VarDescr::_Pos | VarDescr::_Neg);
} else if (round_mode > 0) {
r |= emulate_negate(b) & (VarDescr::_Pos | VarDescr::_Neg);
}
if (a & (VarDescr::_Bit | VarDescr::_Bool)) {
if (r & VarDescr::_Pos) {
r |= VarDescr::_Bit;
}
if (r & VarDescr::_Neg) {
r |= VarDescr::_Bool;
}
}
if (b & VarDescr::_Even) {
r |= a & (VarDescr::_Even | VarDescr::_Odd);
}
return r;
}
bool VarDescr::always_less(const VarDescr& other) const {
if (is_int_const() && other.is_int_const()) {
return int_const < other.int_const;
}
return (always_nonpos() && other.always_pos()) || (always_neg() && other.always_nonneg());
}
bool VarDescr::always_leq(const VarDescr& other) const {
if (is_int_const() && other.is_int_const()) {
return int_const <= other.int_const;
}
return always_nonpos() && other.always_nonneg();
}
bool VarDescr::always_greater(const VarDescr& other) const {
return other.always_less(*this);
}
bool VarDescr::always_geq(const VarDescr& other) const {
return other.always_leq(*this);
}
bool VarDescr::always_equal(const VarDescr& other) const {
return is_int_const() && other.is_int_const() && *int_const == *other.int_const;
}
bool VarDescr::always_neq(const VarDescr& other) const {
if (is_int_const() && other.is_int_const()) {
return *int_const != *other.int_const;
}
return always_greater(other) || always_less(other) || (always_even() && other.always_odd()) ||
(always_odd() && other.always_even());
}
AsmOp exec_op(std::string op) {
return AsmOp::Custom(op);
}
AsmOp exec_op(std::string op, int args, int retv = 1) {
return AsmOp::Custom(op, args, retv);
}
AsmOp exec_arg_op(std::string op, long long arg) {
std::ostringstream os;
os << arg << ' ' << op;
return AsmOp::Custom(os.str());
}
AsmOp exec_arg_op(std::string op, long long arg, int args, int retv) {
std::ostringstream os;
os << arg << ' ' << op;
return AsmOp::Custom(os.str(), args, retv);
}
AsmOp exec_arg_op(std::string op, td::RefInt256 arg) {
std::ostringstream os;
os << arg << ' ' << op;
return AsmOp::Custom(os.str());
}
AsmOp exec_arg_op(std::string op, td::RefInt256 arg, int args, int retv) {
std::ostringstream os;
os << arg << ' ' << op;
return AsmOp::Custom(os.str(), args, retv);
}
AsmOp exec_arg2_op(std::string op, long long imm1, long long imm2, int args, int retv) {
std::ostringstream os;
os << imm1 << ' ' << imm2 << ' ' << op;
return AsmOp::Custom(os.str(), args, retv);
}
AsmOp push_const(td::RefInt256 x) {
return AsmOp::IntConst(std::move(x));
}
AsmOp compile_add(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (x.is_int_const() && y.is_int_const()) {
r.set_const(x.int_const + y.int_const);
if (!r.int_const->is_valid()) {
throw src::ParseError(where, "integer overflow");
}
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_add(x.val, y.val);
if (y.is_int_const() && y.int_const->signed_fits_bits(8)) {
y.unused();
if (y.always_zero()) {
return AsmOp::Nop();
}
if (*y.int_const == 1) {
return exec_op("INC", 1);
}
if (*y.int_const == -1) {
return exec_op("DEC", 1);
}
return exec_arg_op("ADDCONST", y.int_const, 1);
}
if (x.is_int_const() && x.int_const->signed_fits_bits(8)) {
x.unused();
if (x.always_zero()) {
return AsmOp::Nop();
}
if (*x.int_const == 1) {
return exec_op("INC", 1);
}
if (*x.int_const == -1) {
return exec_op("DEC", 1);
}
return exec_arg_op("ADDCONST", x.int_const, 1);
}
return exec_op("ADD", 2);
}
AsmOp compile_sub(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (x.is_int_const() && y.is_int_const()) {
r.set_const(x.int_const - y.int_const);
if (!r.int_const->is_valid()) {
throw src::ParseError(where, "integer overflow");
}
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_sub(x.val, y.val);
if (y.is_int_const() && (-y.int_const)->signed_fits_bits(8)) {
y.unused();
if (y.always_zero()) {
return {};
}
if (*y.int_const == 1) {
return exec_op("DEC", 1);
}
if (*y.int_const == -1) {
return exec_op("INC", 1);
}
return exec_arg_op("ADDCONST", -y.int_const, 1);
}
if (x.always_zero()) {
x.unused();
return exec_op("NEGATE", 1);
}
return exec_op("SUB", 2);
}
AsmOp compile_negate(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 1);
VarDescr &r = res[0], &x = args[0];
if (x.is_int_const()) {
r.set_const(-x.int_const);
if (!r.int_const->is_valid()) {
throw src::ParseError(where, "integer overflow");
}
x.unused();
return push_const(r.int_const);
}
r.val = emulate_negate(x.val);
return exec_op("NEGATE", 1);
}
AsmOp compile_and(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (x.is_int_const() && y.is_int_const()) {
r.set_const(x.int_const & y.int_const);
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_and(x.val, y.val);
return exec_op("AND", 2);
}
AsmOp compile_or(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (x.is_int_const() && y.is_int_const()) {
r.set_const(x.int_const | y.int_const);
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_or(x.val, y.val);
return exec_op("OR", 2);
}
AsmOp compile_xor(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (x.is_int_const() && y.is_int_const()) {
r.set_const(x.int_const ^ y.int_const);
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_xor(x.val, y.val);
return exec_op("XOR", 2);
}
AsmOp compile_not(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 1);
VarDescr &r = res[0], &x = args[0];
if (x.is_int_const()) {
r.set_const(~x.int_const);
x.unused();
return push_const(r.int_const);
}
r.val = emulate_not(x.val);
return exec_op("NOT", 1);
}
AsmOp compile_mul_internal(VarDescr& r, VarDescr& x, VarDescr& y, const SrcLocation& where) {
if (x.is_int_const() && y.is_int_const()) {
r.set_const(x.int_const * y.int_const);
if (!r.int_const->is_valid()) {
throw src::ParseError(where, "integer overflow");
}
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_mul(x.val, y.val);
if (y.is_int_const()) {
int k = is_pos_pow2(y.int_const);
if (y.int_const->signed_fits_bits(8) && k < 0) {
y.unused();
if (y.always_zero() && x.always_finite()) {
// dubious optimization: NaN * 0 = ?
r.set_const(y.int_const);
x.unused();
return push_const(r.int_const);
}
if (*y.int_const == 1 && x.always_finite()) {
return AsmOp::Nop();
}
if (*y.int_const == -1) {
return exec_op("NEGATE", 1);
}
return exec_arg_op("MULCONST", y.int_const, 1);
}
if (k > 0) {
y.unused();
return exec_arg_op("LSHIFT#", k, 1);
}
if (k == 0) {
y.unused();
return AsmOp::Nop();
}
}
if (x.is_int_const()) {
int k = is_pos_pow2(x.int_const);
if (x.int_const->signed_fits_bits(8) && k < 0) {
x.unused();
if (x.always_zero() && y.always_finite()) {
// dubious optimization: NaN * 0 = ?
r.set_const(x.int_const);
y.unused();
return push_const(r.int_const);
}
if (*x.int_const == 1 && y.always_finite()) {
return AsmOp::Nop();
}
if (*x.int_const == -1) {
return exec_op("NEGATE", 1);
}
return exec_arg_op("MULCONST", x.int_const, 1);
}
if (k > 0) {
x.unused();
return exec_arg_op("LSHIFT#", k, 1);
}
if (k == 0) {
x.unused();
return AsmOp::Nop();
}
}
return exec_op("MUL", 2);
}
AsmOp compile_mul(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 2);
return compile_mul_internal(res[0], args[0], args[1], where);
}
AsmOp compile_lshift(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (y.is_int_const()) {
auto yv = y.int_const->to_long();
if (yv < 0 || yv > 256) {
throw src::ParseError(where, "lshift argument is out of range");
} else if (x.is_int_const()) {
r.set_const(x.int_const << (int)yv);
if (!r.int_const->is_valid()) {
throw src::ParseError(where, "integer overflow");
}
x.unused();
y.unused();
return push_const(r.int_const);
}
}
r.val = emulate_lshift(x.val, y.val);
if (y.is_int_const()) {
int k = (int)(y.int_const->to_long());
if (!k /* && x.always_finite() */) {
// dubious optimization: what if x=NaN ?
y.unused();
return AsmOp::Nop();
}
y.unused();
return exec_arg_op("LSHIFT#", k, 1);
}
if (x.is_int_const()) {
auto xv = x.int_const->to_long();
if (xv == 1) {
x.unused();
return exec_op("POW2", 1);
}
if (xv == -1) {
x.unused();
return exec_op("-1 PUSHINT SWAP LSHIFT", 1);
}
}
return exec_op("LSHIFT", 2);
}
AsmOp compile_rshift(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where,
int round_mode) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (y.is_int_const()) {
auto yv = y.int_const->to_long();
if (yv < 0 || yv > 256) {
throw src::ParseError(where, "rshift argument is out of range");
} else if (x.is_int_const()) {
r.set_const(td::rshift(x.int_const, (int)yv, round_mode));
x.unused();
y.unused();
return push_const(r.int_const);
}
}
r.val = emulate_rshift(x.val, y.val);
std::string rshift = (round_mode < 0 ? "RSHIFT" : (round_mode ? "RSHIFTC" : "RSHIFTR"));
if (y.is_int_const()) {
int k = (int)(y.int_const->to_long());
if (!k /* && x.always_finite() */) {
// dubious optimization: what if x=NaN ?
y.unused();
return AsmOp::Nop();
}
y.unused();
return exec_arg_op(rshift + "#", k, 1);
}
return exec_op(rshift, 2);
}
AsmOp compile_div_internal(VarDescr& r, VarDescr& x, VarDescr& y, const SrcLocation& where, int round_mode) {
if (x.is_int_const() && y.is_int_const()) {
r.set_const(div(x.int_const, y.int_const, round_mode));
if (!r.int_const->is_valid()) {
throw src::ParseError(where, *y.int_const == 0 ? "division by zero" : "integer overflow");
}
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_div(x.val, y.val);
if (y.is_int_const()) {
if (*y.int_const == 0) {
throw src::ParseError(where, "division by zero");
}
if (*y.int_const == 1 && x.always_finite()) {
y.unused();
return AsmOp::Nop();
}
if (*y.int_const == -1) {
y.unused();
return exec_op("NEGATE", 1);
}
int k = is_pos_pow2(y.int_const);
if (k > 0) {
y.unused();
std::string op = "RSHIFT";
if (round_mode >= 0) {
op += (round_mode > 0 ? 'C' : 'R');
}
return exec_arg_op(op + '#', k, 1);
}
}
std::string op = "DIV";
if (round_mode >= 0) {
op += (round_mode > 0 ? 'C' : 'R');
}
return exec_op(op, 2);
}
AsmOp compile_div(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where, int round_mode) {
func_assert(res.size() == 1 && args.size() == 2);
return compile_div_internal(res[0], args[0], args[1], where, round_mode);
}
AsmOp compile_mod(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const src::SrcLocation& where,
int round_mode) {
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (x.is_int_const() && y.is_int_const()) {
r.set_const(mod(x.int_const, y.int_const, round_mode));
if (!r.int_const->is_valid()) {
throw src::ParseError(where, *y.int_const == 0 ? "division by zero" : "integer overflow");
}
x.unused();
y.unused();
return push_const(r.int_const);
}
r.val = emulate_mod(x.val, y.val);
if (y.is_int_const()) {
if (*y.int_const == 0) {
throw src::ParseError(where, "division by zero");
}
if ((*y.int_const == 1 || *y.int_const == -1) && x.always_finite()) {
x.unused();
y.unused();
r.set_const(td::zero_refint());
return push_const(r.int_const);
}
int k = is_pos_pow2(y.int_const);
if (k > 0) {
y.unused();
std::string op = "MODPOW2";
if (round_mode >= 0) {
op += (round_mode > 0 ? 'C' : 'R');
}
return exec_arg_op(op + '#', k, 1);
}
}
std::string op = "MOD";
if (round_mode >= 0) {
op += (round_mode > 0 ? 'C' : 'R');
}
return exec_op(op, 2);
}
AsmOp compile_muldiv(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation& where,
int round_mode) {
func_assert(res.size() == 1 && args.size() == 3);
VarDescr &r = res[0], &x = args[0], &y = args[1], &z = args[2];
if (x.is_int_const() && y.is_int_const() && z.is_int_const()) {
r.set_const(muldiv(x.int_const, y.int_const, z.int_const, round_mode));
if (!r.int_const->is_valid()) {
throw src::ParseError(where, *z.int_const == 0 ? "division by zero" : "integer overflow");
}
x.unused();
y.unused();
z.unused();
return push_const(r.int_const);
}
if (x.always_zero() || y.always_zero()) {
// dubious optimization for z=0...
x.unused();
y.unused();
z.unused();
r.set_const(td::make_refint(0));
return push_const(r.int_const);
}
char c = (round_mode < 0) ? 0 : (round_mode > 0 ? 'C' : 'R');
r.val = emulate_div(emulate_mul(x.val, y.val), z.val);
if (z.is_int_const()) {
if (*z.int_const == 0) {
throw src::ParseError(where, "division by zero");
}
if (*z.int_const == 1) {
z.unused();
return compile_mul_internal(r, x, y, where);
}
}
if (y.is_int_const() && *y.int_const == 1) {
y.unused();
return compile_div_internal(r, x, z, where, round_mode);
}
if (x.is_int_const() && *x.int_const == 1) {
x.unused();
return compile_div_internal(r, y, z, where, round_mode);
}
if (z.is_int_const()) {
int k = is_pos_pow2(z.int_const);
if (k > 0) {
z.unused();
std::string op = "MULRSHIFT";
if (c) {
op += c;
}
return exec_arg_op(op + '#', k, 2);
}
}
if (y.is_int_const()) {
int k = is_pos_pow2(y.int_const);
if (k > 0) {
y.unused();
std::string op = "LSHIFT#DIV";
if (c) {
op += c;
}
return exec_arg_op(op, k, 2);
}
}
if (x.is_int_const()) {
int k = is_pos_pow2(x.int_const);
if (k > 0) {
x.unused();
std::string op = "LSHIFT#DIV";
if (c) {
op += c;
}
return exec_arg_op(op, k, 2);
}
}
std::string op = "MULDIV";
if (c) {
op += c;
}
return exec_op(op, 3);
}
int compute_compare(td::RefInt256 x, td::RefInt256 y, int mode) {
int s = td::cmp(x, y);
if (mode == 7) {
return s;
} else {
return -((mode >> (1 - s)) & 1);
}
}
// return value:
// 4 -> constant 1
// 2 -> constant 0
// 1 -> constant -1
// 3 -> 0 or -1
int compute_compare(const VarDescr& x, const VarDescr& y, int mode) {
switch (mode) {
case 1: // >
return x.always_greater(y) ? 1 : (x.always_leq(y) ? 2 : 3);
case 2: // =
return x.always_equal(y) ? 1 : (x.always_neq(y) ? 2 : 3);
case 3: // >=
return x.always_geq(y) ? 1 : (x.always_less(y) ? 2 : 3);
case 4: // <
return x.always_less(y) ? 1 : (x.always_geq(y) ? 2 : 3);
case 5: // <>
return x.always_neq(y) ? 1 : (x.always_equal(y) ? 2 : 3);
case 6: // <=
return x.always_leq(y) ? 1 : (x.always_greater(y) ? 2 : 3);
case 7: // <=>
return x.always_less(y)
? 1
: (x.always_equal(y)
? 2
: (x.always_greater(y)
? 4
: (x.always_leq(y) ? 3 : (x.always_geq(y) ? 6 : (x.always_neq(y) ? 5 : 7)))));
default:
return 7;
}
}
AsmOp compile_cmp_int(std::vector<VarDescr>& res, std::vector<VarDescr>& args, int mode) {
func_assert(mode >= 1 && mode <= 7);
func_assert(res.size() == 1 && args.size() == 2);
VarDescr &r = res[0], &x = args[0], &y = args[1];
if (x.is_int_const() && y.is_int_const()) {
int v = compute_compare(x.int_const, y.int_const, mode);
r.set_const(v);
x.unused();
y.unused();
return mode == 7 ? push_const(r.int_const) : AsmOp::BoolConst(v != 0);
}
int v = compute_compare(x, y, mode);
// std::cerr << "compute_compare(" << x << ", " << y << ", " << mode << ") = " << v << std::endl;
func_assert(v);
if (!(v & (v - 1))) {
r.set_const(v - (v >> 2) - 2);
x.unused();
y.unused();
return mode == 7 ? push_const(r.int_const) : AsmOp::BoolConst(v & 1);
}
r.val = ~0;
if (v & 1) {
r.val &= VarDescr::ConstTrue;
}
if (v & 2) {
r.val &= VarDescr::ConstZero;
}
if (v & 4) {
r.val &= VarDescr::ConstOne;
}
// std::cerr << "result: " << r << std::endl;
static const char* cmp_int_names[] = {"", "GTINT", "EQINT", "GTINT", "LESSINT", "NEQINT", "LESSINT"};
static const char* cmp_names[] = {"", "GREATER", "EQUAL", "GEQ", "LESS", "NEQ", "LEQ", "CMP"};
static int cmp_int_delta[] = {0, 0, 0, -1, 0, 0, 1};
if (mode != 7) {
if (y.is_int_const() && y.int_const >= -128 && y.int_const <= 127) {
y.unused();
return exec_arg_op(cmp_int_names[mode], y.int_const + cmp_int_delta[mode], 1);
}
if (x.is_int_const() && x.int_const >= -128 && x.int_const <= 127) {
x.unused();
mode = ((mode & 4) >> 2) | (mode & 2) | ((mode & 1) << 2);
return exec_arg_op(cmp_int_names[mode], x.int_const + cmp_int_delta[mode], 1);
}
}
return exec_op(cmp_names[mode], 2);
}
AsmOp compile_throw(std::vector<VarDescr>& res, std::vector<VarDescr>& args, const SrcLocation&) {
func_assert(res.empty() && args.size() == 1);
VarDescr& x = args[0];
if (x.is_int_const() && x.int_const->unsigned_fits_bits(11)) {
x.unused();
return exec_arg_op("THROW", x.int_const, 0, 0);
} else {
return exec_op("THROWANY", 1, 0);
}
}
AsmOp compile_cond_throw(std::vector<VarDescr>& res, std::vector<VarDescr>& args, bool mode) {
func_assert(res.empty() && args.size() == 2);
VarDescr &x = args[0], &y = args[1];
std::string suff = (mode ? "IF" : "IFNOT");
bool skip_cond = false;
if (y.always_true() || y.always_false()) {
y.unused();
skip_cond = true;
if (y.always_true() != mode) {
x.unused();