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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/simulator.h"
     37 #include "test/cctest/cctest.h"
     38 #include "test/cctest/test-code-stubs.h"
     39 
     40 using namespace v8::internal;
     41 
     42 #define __ masm.
     43 
     44 ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
     45                                               Register source_reg,
     46                                               Register destination_reg,
     47                                               bool inline_fastpath) {
     48   // Allocate an executable page of memory.
     49   size_t actual_size = 4 * Assembler::kMinimalBufferSize;
     50   byte* buffer = static_cast<byte*>(
     51       v8::base::OS::Allocate(actual_size, &actual_size, true));
     52   CHECK(buffer);
     53   HandleScope handles(isolate);
     54   MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
     55                       v8::internal::CodeObjectRequired::kYes);
     56   DoubleToIStub stub(isolate, source_reg, destination_reg, 0, true,
     57                      inline_fastpath);
     58 
     59   byte* start = stub.GetCode()->instruction_start();
     60   Label done;
     61 
     62   __ SetStackPointer(csp);
     63   __ PushCalleeSavedRegisters();
     64   __ Mov(jssp, csp);
     65   __ SetStackPointer(jssp);
     66 
     67   // Push the double argument.
     68   __ Push(d0);
     69   __ Mov(source_reg, jssp);
     70 
     71   MacroAssembler::PushPopQueue queue(&masm);
     72 
     73   // Save registers make sure they don't get clobbered.
     74   int source_reg_offset = kDoubleSize;
     75   int reg_num = 0;
     76   for (; reg_num < Register::kNumRegisters; ++reg_num) {
     77     Register reg = Register::from_code(reg_num);
     78     if (reg.IsAllocatable()) {
     79       if (!reg.is(destination_reg)) {
     80         queue.Queue(reg);
     81         source_reg_offset += kPointerSize;
     82       }
     83     }
     84   }
     85   // Re-push the double argument.
     86   queue.Queue(d0);
     87 
     88   queue.PushQueued();
     89 
     90   // Call through to the actual stub
     91   if (inline_fastpath) {
     92     __ Ldr(d0, MemOperand(source_reg));
     93     __ TryConvertDoubleToInt64(destination_reg, d0, &done);
     94     if (destination_reg.is(source_reg)) {
     95       // Restore clobbered source_reg.
     96       __ add(source_reg, jssp, Operand(source_reg_offset));
     97     }
     98   }
     99   __ Call(start, RelocInfo::EXTERNAL_REFERENCE);
    100   __ bind(&done);
    101 
    102   __ Drop(1, kDoubleSize);
    103 
    104   // // Make sure no registers have been unexpectedly clobbered
    105   for (--reg_num; reg_num >= 0; --reg_num) {
    106     Register reg = Register::from_code(reg_num);
    107     if (reg.IsAllocatable()) {
    108       if (!reg.is(destination_reg)) {
    109         __ Pop(ip0);
    110         __ cmp(reg, ip0);
    111         __ Assert(eq, kRegisterWasClobbered);
    112       }
    113     }
    114   }
    115 
    116   __ Drop(1, kDoubleSize);
    117 
    118   if (!destination_reg.is(x0))
    119     __ Mov(x0, destination_reg);
    120 
    121   // Restore callee save registers.
    122   __ Mov(csp, jssp);
    123   __ SetStackPointer(csp);
    124   __ PopCalleeSavedRegisters();
    125 
    126   __ Ret();
    127 
    128   CodeDesc desc;
    129   masm.GetCode(&desc);
    130   Assembler::FlushICache(isolate, buffer, actual_size);
    131   return (reinterpret_cast<ConvertDToIFunc>(
    132       reinterpret_cast<intptr_t>(buffer)));
    133 }
    134 
    135 #undef __
    136 
    137 
    138 static Isolate* GetIsolateFrom(LocalContext* context) {
    139   return reinterpret_cast<Isolate*>((*context)->GetIsolate());
    140 }
    141 
    142 
    143 int32_t RunGeneratedCodeCallWrapper(ConvertDToIFunc func,
    144                                     double from) {
    145 #ifdef USE_SIMULATOR
    146   Simulator::CallArgument args[] = {
    147       Simulator::CallArgument(from),
    148       Simulator::CallArgument::End()
    149   };
    150   return static_cast<int32_t>(Simulator::current(CcTest::i_isolate())
    151                                   ->CallInt64(FUNCTION_ADDR(func), args));
    152 #else
    153   return (*func)(from);
    154 #endif
    155 }
    156 
    157 
    158 TEST(ConvertDToI) {
    159   CcTest::InitializeVM();
    160   LocalContext context;
    161   Isolate* isolate = GetIsolateFrom(&context);
    162   HandleScope scope(isolate);
    163 
    164 #if DEBUG
    165   // Verify that the tests actually work with the C version. In the release
    166   // code, the compiler optimizes it away because it's all constant, but does it
    167   // wrong, triggering an assert on gcc.
    168   RunAllTruncationTests(&ConvertDToICVersion);
    169 #endif
    170 
    171   Register source_registers[] = {jssp, x0, x1, x2, x3, x4, x5, x6, x7, x8, x9,
    172                                  x10, x11, x12, x13, x14, x15, x18, x19, x20,
    173                                  x21, x22, x23, x24};
    174   Register dest_registers[] = {x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11,
    175                                x12, x13, x14, x15, x18, x19, x20, x21, x22, x23,
    176                                x24};
    177 
    178   for (size_t s = 0; s < sizeof(source_registers) / sizeof(Register); s++) {
    179     for (size_t d = 0; d < sizeof(dest_registers) / sizeof(Register); d++) {
    180       RunAllTruncationTests(
    181           RunGeneratedCodeCallWrapper,
    182           MakeConvertDToIFuncTrampoline(isolate,
    183                                         source_registers[s],
    184                                         dest_registers[d],
    185                                         false));
    186       RunAllTruncationTests(
    187           RunGeneratedCodeCallWrapper,
    188           MakeConvertDToIFuncTrampoline(isolate,
    189                                         source_registers[s],
    190                                         dest_registers[d],
    191                                         true));
    192     }
    193   }
    194 }
    195