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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Rrdistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Rrdistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Rrdistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include <stdlib.h>
     29 
     30 #include "src/v8.h"
     31 
     32 #include "src/base/platform/platform.h"
     33 #include "src/code-stubs.h"
     34 #include "src/factory.h"
     35 #include "src/macro-assembler.h"
     36 #include "src/register-configuration.h"
     37 #include "test/cctest/cctest.h"
     38 #include "test/cctest/test-code-stubs.h"
     39 
     40 using namespace v8::internal;
     41 
     42 
     43 #define __ assm.
     44 
     45 ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
     46                                               Register source_reg,
     47                                               Register destination_reg) {
     48   // Allocate an executable page of memory.
     49   size_t actual_size;
     50   byte* buffer = static_cast<byte*>(v8::base::OS::Allocate(
     51       Assembler::kMinimalBufferSize, &actual_size, true));
     52   CHECK(buffer);
     53   HandleScope handles(isolate);
     54   MacroAssembler assm(isolate, buffer, static_cast<int>(actual_size),
     55                       v8::internal::CodeObjectRequired::kYes);
     56   int offset =
     57     source_reg.is(rsp) ? 0 : (HeapNumber::kValueOffset - kSmiTagSize);
     58   DoubleToIStub stub(isolate, source_reg, destination_reg, offset, true);
     59   byte* start = stub.GetCode()->instruction_start();
     60 
     61   __ pushq(rbx);
     62   __ pushq(rcx);
     63   __ pushq(rdx);
     64   __ pushq(rsi);
     65   __ pushq(rdi);
     66 
     67 
     68   const RegisterConfiguration* config =
     69       RegisterConfiguration::ArchDefault(RegisterConfiguration::CRANKSHAFT);
     70   if (!source_reg.is(rsp)) {
     71     // The argument we pass to the stub is not a heap number, but instead
     72     // stack-allocated and offset-wise made to look like a heap number for
     73     // the stub.  We create that "heap number" after pushing all allocatable
     74     // registers.
     75     int double_argument_slot =
     76         (config->num_allocatable_general_registers() - 1) * kPointerSize +
     77         kDoubleSize;
     78     __ leaq(source_reg, MemOperand(rsp, -double_argument_slot - offset));
     79   }
     80 
     81   // Save registers make sure they don't get clobbered.
     82   int reg_num = 0;
     83   for (; reg_num < config->num_allocatable_general_registers(); ++reg_num) {
     84     Register reg =
     85         Register::from_code(config->GetAllocatableGeneralCode(reg_num));
     86     if (!reg.is(rsp) && !reg.is(rbp) && !reg.is(destination_reg)) {
     87       __ pushq(reg);
     88     }
     89   }
     90 
     91   // Put the double argument into the designated double argument slot.
     92   __ subq(rsp, Immediate(kDoubleSize));
     93   __ Movsd(MemOperand(rsp, 0), xmm0);
     94 
     95   // Call through to the actual stub
     96   __ Call(start, RelocInfo::EXTERNAL_REFERENCE);
     97 
     98   __ addq(rsp, Immediate(kDoubleSize));
     99 
    100   // Make sure no registers have been unexpectedly clobbered
    101   for (--reg_num; reg_num >= 0; --reg_num) {
    102     Register reg =
    103         Register::from_code(config->GetAllocatableGeneralCode(reg_num));
    104     if (!reg.is(rsp) && !reg.is(rbp) && !reg.is(destination_reg)) {
    105       __ cmpq(reg, MemOperand(rsp, 0));
    106       __ Assert(equal, kRegisterWasClobbered);
    107       __ addq(rsp, Immediate(kPointerSize));
    108     }
    109   }
    110 
    111   __ movq(rax, destination_reg);
    112 
    113   __ popq(rdi);
    114   __ popq(rsi);
    115   __ popq(rdx);
    116   __ popq(rcx);
    117   __ popq(rbx);
    118 
    119   __ ret(0);
    120 
    121   CodeDesc desc;
    122   assm.GetCode(&desc);
    123   return reinterpret_cast<ConvertDToIFunc>(
    124       reinterpret_cast<intptr_t>(buffer));
    125 }
    126 
    127 #undef __
    128 
    129 
    130 static Isolate* GetIsolateFrom(LocalContext* context) {
    131   return reinterpret_cast<Isolate*>((*context)->GetIsolate());
    132 }
    133 
    134 
    135 TEST(ConvertDToI) {
    136   CcTest::InitializeVM();
    137   LocalContext context;
    138   Isolate* isolate = GetIsolateFrom(&context);
    139   HandleScope scope(isolate);
    140 
    141 #if DEBUG
    142   // Verify that the tests actually work with the C version. In the release
    143   // code, the compiler optimizes it away because it's all constant, but does it
    144   // wrong, triggering an assert on gcc.
    145   RunAllTruncationTests(&ConvertDToICVersion);
    146 #endif
    147 
    148   Register source_registers[] = {rsp, rax, rbx, rcx, rdx, rsi, rdi, r8, r9};
    149   Register dest_registers[] = {rax, rbx, rcx, rdx, rsi, rdi, r8, r9};
    150 
    151   for (size_t s = 0; s < sizeof(source_registers) / sizeof(Register); s++) {
    152     for (size_t d = 0; d < sizeof(dest_registers) / sizeof(Register); d++) {
    153       RunAllTruncationTests(
    154           MakeConvertDToIFuncTrampoline(isolate,
    155                                         source_registers[s],
    156                                         dest_registers[d]));
    157     }
    158   }
    159 }
    160