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