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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2020-2020. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include <algorithm>
#include "beam_asm.hpp"
extern "C"
{
#include "erl_bif_table.h"
#include "big.h"
#include "beam_catches.h"
#include "beam_common.h"
#include "code_ix.h"
}
using namespace asmjit;
/*
* We considered specializing tuple_size/1, but ultimately didn't
* consider it worth doing.
*
* At the time of writing, there were 294 uses of tuple_size/1
* in the OTP source code. (11 of them were in dialyzer.)
*
* The code size for the specialization was 34 bytes,
* while the code size for the bif1 instruction was 24 bytes.
*/
void BeamGlobalAssembler::emit_handle_hd_error() {
static ErtsCodeMFA mfa = {am_erlang, am_hd, 1};
a.mov(getXRef(0), RET);
a.mov(x86::qword_ptr(c_p, offsetof(Process, freason)), imm(BADARG));
a.mov(ARG4, imm(&mfa));
a.jmp(labels[handle_error_shared_prologue]);
}
/*
* At the time of implementation, there were 3285 uses of hd/1 in
* the OTP source code. Most of them were in code generated by
* yecc.
*
* The code size for this specialization of hd/1 is 21 bytes,
* while the code size for the bif1 instruction is 24 bytes.
*/
void BeamModuleAssembler::emit_bif_hd(const ArgVal &Fail,
const ArgVal &Src,
const ArgVal &Hd) {
mov_arg(RET, Src);
a.test(RETb, imm(_TAG_PRIMARY_MASK - TAG_PRIMARY_LIST));
Uint fail = Fail.getValue();
if (fail) {
a.jne(labels[fail]);
} else {
Label next = a.newLabel();
a.short_().je(next);
safe_fragment_call(ga->get_handle_hd_error());
a.bind(next);
}
x86::Gp boxed_ptr = emit_ptr_val(RET, RET);
a.mov(ARG2, getCARRef(boxed_ptr));
mov_arg(Hd, ARG2);
}
void BeamGlobalAssembler::emit_handle_element_error() {
static ErtsCodeMFA mfa = {am_erlang, am_element, 2};
a.mov(getXRef(0), ARG1);
a.mov(getXRef(1), ARG2);
a.mov(x86::qword_ptr(c_p, offsetof(Process, freason)), imm(BADARG));
a.mov(ARG4, imm(&mfa));
a.jmp(labels[handle_error_shared_prologue]);
}
/*
* ARG1 = Position (1-based)
* ARG2 = Tuple
* ARG3 = 0 if if in body, otherwise address of failure label.
*
* Will return with a value in RET only if the element operation succeeds.
*/
void BeamGlobalAssembler::emit_bif_element_shared() {
Label error = a.newLabel();
a.mov(RETd, ARG1d);
a.and_(RETb, imm(_TAG_IMMED1_MASK));
a.cmp(RETb, imm(_TAG_IMMED1_SMALL));
a.short_().jne(error);
a.mov(ARG4, ARG1);
a.sar(ARG4, imm(_TAG_IMMED1_SIZE));
emit_is_boxed(error, ARG2, dShort);
a.mov(ARG5, ARG2);
(void)emit_ptr_val(ARG5, ARG5);
a.lea(ARG5, emit_boxed_val(ARG5));
a.mov(ARG6, x86::qword_ptr(ARG5));
a.mov(RETd, ARG6d);
ERTS_CT_ASSERT(make_arityval(0) == 0);
a.and_(RETb, imm(_TAG_HEADER_MASK));
a.short_().jne(error);
a.shr(ARG6, imm(_HEADER_ARITY_OFFS));
a.dec(ARG4);
a.cmp(ARG6, ARG4);
a.short_().jbe(error);
a.inc(ARG4);
a.mov(RET, x86::qword_ptr(ARG5, ARG4, 3));
a.test(RETd, RETd);
a.ret();
a.bind(error);
{
Label exception = a.newLabel();
a.test(ARG3, ARG3);
a.short_().je(exception);
emit_discard_cp();
a.jmp(ARG3);
a.bind(exception);
a.jmp(labels[handle_element_error]);
}
}
/*
* At the time of implementation, there were 3678 uses of element/2 in
* the OTP source code. 3137 of those uses had a literal first argument
* (the position in the tuple), while 540 uses had a varible first
* argument. Calls to element/2 (with a literal first argument) is
* especially common in code generated by yecc.
*/
void BeamModuleAssembler::emit_bif_element(const ArgVal &Fail,
const ArgVal &Pos,
const ArgVal &Tuple,
const ArgVal &Dst) {
bool const_position;
const_position = Pos.getType() == ArgVal::i && is_small(Pos.getValue()) &&
signed_val(Pos.getValue()) > 0 &&
signed_val(Pos.getValue()) <= (Sint)MAX_ARITYVAL;
if (const_position) {
/* The position is a valid small integer. Inline the code.
*
* The size of the code is 40 bytes, while the size of the bif2
* instruction is 36 bytes. */
Uint position = signed_val(Pos.getValue());
Label error;
mov_arg(ARG2, Tuple);
if (Fail.getValue() == 0) {
error = a.newLabel();
emit_is_boxed(error, ARG2, dShort);
} else {
emit_is_boxed(labels[Fail.getValue()], ARG2);
}
x86::Gp boxed_ptr = emit_ptr_val(ARG3, ARG2);
a.mov(RETd, emit_boxed_val(boxed_ptr, 0, sizeof(Uint32)));
ERTS_CT_ASSERT(Support::isInt32(make_arityval(MAX_ARITYVAL)));
a.cmp(RETd, imm(make_arityval(position)));
if (Fail.getValue() == 0) {
a.short_().jb(error);
} else {
a.jb(labels[Fail.getValue()]);
}
ERTS_CT_ASSERT(make_arityval(0) == 0);
a.and_(RETb, imm(_TAG_HEADER_MASK));
if (Fail.getValue() == 0) {
Label next = a.newLabel();
a.short_().je(next);
a.bind(error);
{
mov_imm(ARG1, make_small(position));
safe_fragment_call(ga->get_handle_element_error());
}
a.bind(next);
} else {
a.jne(labels[Fail.getValue()]);
}
a.mov(RET, emit_boxed_val(boxed_ptr, position * sizeof(Eterm)));
} else {
/* The code is too large to inline. Call a shared fragment.
*
* The size of the code that calls the shared fragment is 19 bytes,
* while the size of the bif2 instruction is 36 bytes. */
mov_arg(ARG2, Tuple);
mov_arg(ARG1, Pos);
if (Fail.getValue() != 0) {
a.lea(ARG3, x86::qword_ptr(labels[Fail.getValue()]));
} else {
mov_imm(ARG3, 0);
}
safe_fragment_call(ga->get_bif_element_shared());
}
mov_arg(Dst, RET);
}
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