1// Copyright 2011 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions 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 "v8.h"
31
32#include "factory.h"
33#include "macro-assembler.h"
34#include "cctest.h"
35#include "code-stubs.h"
36#include "objects.h"
37
38#ifdef USE_SIMULATOR
39#include "simulator.h"
40#endif
41
42using namespace v8::internal;
43
44
45typedef uint32_t (*HASH_FUNCTION)();
46
47#define __ masm->
48
49
50void generate(MacroAssembler* masm, i::Vector<const uint8_t> string) {
51  // GenerateHashInit takes the first character as an argument so it can't
52  // handle the zero length string.
53  ASSERT(string.length() > 0);
54#if V8_TARGET_ARCH_IA32
55  __ push(ebx);
56  __ push(ecx);
57  __ mov(eax, Immediate(0));
58  __ mov(ebx, Immediate(string.at(0)));
59  StringHelper::GenerateHashInit(masm, eax, ebx, ecx);
60  for (int i = 1; i < string.length(); i++) {
61    __ mov(ebx, Immediate(string.at(i)));
62    StringHelper::GenerateHashAddCharacter(masm, eax, ebx, ecx);
63  }
64  StringHelper::GenerateHashGetHash(masm, eax, ecx);
65  __ pop(ecx);
66  __ pop(ebx);
67  __ Ret();
68#elif V8_TARGET_ARCH_X64
69  __ push(kRootRegister);
70  __ InitializeRootRegister();
71  __ push(rbx);
72  __ push(rcx);
73  __ movq(rax, Immediate(0));
74  __ movq(rbx, Immediate(string.at(0)));
75  StringHelper::GenerateHashInit(masm, rax, rbx, rcx);
76  for (int i = 1; i < string.length(); i++) {
77    __ movq(rbx, Immediate(string.at(i)));
78    StringHelper::GenerateHashAddCharacter(masm, rax, rbx, rcx);
79  }
80  StringHelper::GenerateHashGetHash(masm, rax, rcx);
81  __ pop(rcx);
82  __ pop(rbx);
83  __ pop(kRootRegister);
84  __ Ret();
85#elif V8_TARGET_ARCH_ARM
86  __ push(kRootRegister);
87  __ InitializeRootRegister();
88
89  __ mov(r0, Operand(0));
90  __ mov(ip, Operand(string.at(0)));
91  StringHelper::GenerateHashInit(masm, r0, ip);
92  for (int i = 1; i < string.length(); i++) {
93    __ mov(ip, Operand(string.at(i)));
94    StringHelper::GenerateHashAddCharacter(masm, r0, ip);
95  }
96  StringHelper::GenerateHashGetHash(masm, r0);
97  __ pop(kRootRegister);
98  __ mov(pc, Operand(lr));
99#elif V8_TARGET_ARCH_MIPS
100  __ push(kRootRegister);
101  __ InitializeRootRegister();
102
103  __ li(v0, Operand(0));
104  __ li(t1, Operand(string.at(0)));
105  StringHelper::GenerateHashInit(masm, v0, t1);
106  for (int i = 1; i < string.length(); i++) {
107    __ li(t1, Operand(string.at(i)));
108    StringHelper::GenerateHashAddCharacter(masm, v0, t1);
109  }
110  StringHelper::GenerateHashGetHash(masm, v0);
111  __ pop(kRootRegister);
112  __ jr(ra);
113  __ nop();
114#endif
115}
116
117
118void generate(MacroAssembler* masm, uint32_t key) {
119#if V8_TARGET_ARCH_IA32
120  __ push(ebx);
121  __ mov(eax, Immediate(key));
122  __ GetNumberHash(eax, ebx);
123  __ pop(ebx);
124  __ Ret();
125#elif V8_TARGET_ARCH_X64
126  __ push(kRootRegister);
127  __ InitializeRootRegister();
128  __ push(rbx);
129  __ movq(rax, Immediate(key));
130  __ GetNumberHash(rax, rbx);
131  __ pop(rbx);
132  __ pop(kRootRegister);
133  __ Ret();
134#elif V8_TARGET_ARCH_ARM
135  __ push(kRootRegister);
136  __ InitializeRootRegister();
137  __ mov(r0, Operand(key));
138  __ GetNumberHash(r0, ip);
139  __ pop(kRootRegister);
140  __ mov(pc, Operand(lr));
141#elif V8_TARGET_ARCH_MIPS
142  __ push(kRootRegister);
143  __ InitializeRootRegister();
144  __ li(v0, Operand(key));
145  __ GetNumberHash(v0, t1);
146  __ pop(kRootRegister);
147  __ jr(ra);
148  __ nop();
149#endif
150}
151
152
153void check(i::Vector<const uint8_t> string) {
154  Isolate* isolate = CcTest::i_isolate();
155  Factory* factory = isolate->factory();
156  HandleScope scope(isolate);
157
158  v8::internal::byte buffer[2048];
159  MacroAssembler masm(isolate, buffer, sizeof buffer);
160
161  generate(&masm, string);
162
163  CodeDesc desc;
164  masm.GetCode(&desc);
165  Handle<Object> undefined(isolate->heap()->undefined_value(), isolate);
166  Handle<Code> code = factory->NewCode(desc,
167                                       Code::ComputeFlags(Code::STUB),
168                                       undefined);
169  CHECK(code->IsCode());
170
171  HASH_FUNCTION hash = FUNCTION_CAST<HASH_FUNCTION>(code->entry());
172  Handle<String> v8_string = factory->NewStringFromOneByte(string);
173  v8_string->set_hash_field(String::kEmptyHashField);
174#ifdef USE_SIMULATOR
175  uint32_t codegen_hash =
176      reinterpret_cast<uint32_t>(CALL_GENERATED_CODE(hash, 0, 0, 0, 0, 0));
177#else
178  uint32_t codegen_hash = hash();
179#endif
180  uint32_t runtime_hash = v8_string->Hash();
181  CHECK(runtime_hash == codegen_hash);
182}
183
184
185void check(i::Vector<const char> s) {
186  check(i::Vector<const uint8_t>::cast(s));
187}
188
189
190void check(uint32_t key) {
191  Isolate* isolate = CcTest::i_isolate();
192  Factory* factory = isolate->factory();
193  HandleScope scope(isolate);
194
195  v8::internal::byte buffer[2048];
196  MacroAssembler masm(CcTest::i_isolate(), buffer, sizeof buffer);
197
198  generate(&masm, key);
199
200  CodeDesc desc;
201  masm.GetCode(&desc);
202  Handle<Object> undefined(isolate->heap()->undefined_value(), isolate);
203  Handle<Code> code = factory->NewCode(desc,
204                                       Code::ComputeFlags(Code::STUB),
205                                       undefined);
206  CHECK(code->IsCode());
207
208  HASH_FUNCTION hash = FUNCTION_CAST<HASH_FUNCTION>(code->entry());
209#ifdef USE_SIMULATOR
210  uint32_t codegen_hash =
211      reinterpret_cast<uint32_t>(CALL_GENERATED_CODE(hash, 0, 0, 0, 0, 0));
212#else
213  uint32_t codegen_hash = hash();
214#endif
215
216  uint32_t runtime_hash = ComputeIntegerHash(key, isolate->heap()->HashSeed());
217  CHECK(runtime_hash == codegen_hash);
218}
219
220
221void check_twochars(uint8_t a, uint8_t b) {
222  uint8_t ab[2] = {a, b};
223  check(i::Vector<const uint8_t>(ab, 2));
224}
225
226
227static uint32_t PseudoRandom(uint32_t i, uint32_t j) {
228  return ~(~((i * 781) ^ (j * 329)));
229}
230
231
232TEST(StringHash) {
233  v8::Isolate* isolate = CcTest::isolate();
234  v8::HandleScope handle_scope(isolate);
235  v8::Context::Scope context_scope(v8::Context::New(isolate));
236
237  for (uint8_t a = 0; a < String::kMaxOneByteCharCode; a++) {
238    // Numbers are hashed differently.
239    if (a >= '0' && a <= '9') continue;
240    for (uint8_t b = 0; b < String::kMaxOneByteCharCode; b++) {
241      if (b >= '0' && b <= '9') continue;
242      check_twochars(a, b);
243    }
244  }
245  check(i::Vector<const char>("*",       1));
246  check(i::Vector<const char>(".zZ",     3));
247  check(i::Vector<const char>("muc",     3));
248  check(i::Vector<const char>("(>'_')>", 7));
249  check(i::Vector<const char>("-=[ vee eight ftw ]=-", 21));
250}
251
252
253TEST(NumberHash) {
254  v8::Isolate* isolate = CcTest::isolate();
255  v8::HandleScope handle_scope(isolate);
256  v8::Context::Scope context_scope(v8::Context::New(isolate));
257
258  // Some specific numbers
259  for (uint32_t key = 0; key < 42; key += 7) {
260    check(key);
261  }
262
263  // Some pseudo-random numbers
264  static const uint32_t kLimit = 1000;
265  for (uint32_t i = 0; i < 5; i++) {
266    for (uint32_t j = 0; j < 5; j++) {
267      check(PseudoRandom(i, j) % kLimit);
268    }
269  }
270}
271
272#undef __
273