test-hashing.cc revision 592a9fc1d8ea420377a2e7efd0600e20b058be2b 
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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
47static v8::Persistent<v8::Context> env;
48
49#define __ assm->
50
51
52void generate(MacroAssembler* assm, i::Vector<const char> string) {
53#ifdef V8_TARGET_ARCH_IA32
54  __ push(ebx);
55  __ push(ecx);
56  __ mov(eax, Immediate(0));
57  if (string.length() > 0) {
58    __ mov(ebx, Immediate(string.at(0)));
59    StringHelper::GenerateHashInit(assm, eax, ebx, ecx);
60  }
61  for (int i = 1; i < string.length(); i++) {
62    __ mov(ebx, Immediate(string.at(i)));
63    StringHelper::GenerateHashAddCharacter(assm, eax, ebx, ecx);
64  }
65  StringHelper::GenerateHashGetHash(assm, eax, ecx);
66  __ pop(ecx);
67  __ pop(ebx);
68  __ Ret();
69#elif V8_TARGET_ARCH_X64
70  __ push(rbx);
71  __ push(rcx);
72  __ movq(rax, Immediate(0));
73  if (string.length() > 0) {
74    __ movq(rbx, Immediate(string.at(0)));
75    StringHelper::GenerateHashInit(assm, rax, rbx, rcx);
76  }
77  for (int i = 1; i < string.length(); i++) {
78    __ movq(rbx, Immediate(string.at(i)));
79    StringHelper::GenerateHashAddCharacter(assm, rax, rbx, rcx);
80  }
81  StringHelper::GenerateHashGetHash(assm, rax, rcx);
82  __ pop(rcx);
83  __ pop(rbx);
84  __ Ret();
85#elif V8_TARGET_ARCH_ARM
86  __ mov(r0, Operand(0));
87  if (string.length() > 0) {
88    __ mov(ip, Operand(string.at(0)));
89    StringHelper::GenerateHashInit(assm, r0, ip);
90  }
91  for (int i = 1; i < string.length(); i++) {
92    __ mov(ip, Operand(string.at(i)));
93    StringHelper::GenerateHashAddCharacter(assm, r0, ip);
94  }
95  StringHelper::GenerateHashGetHash(assm, r0);
96  __ mov(pc, Operand(lr));
97#elif V8_TARGET_ARCH_MIPS
98  __ li(v0, Operand(0));
99  if (string.length() > 0) {
100    __ li(t1, Operand(string.at(0)));
101    StringHelper::GenerateHashInit(assm, v0, t1);
102  }
103  for (int i = 1; i < string.length(); i++) {
104    __ li(t1, Operand(string.at(i)));
105    StringHelper::GenerateHashAddCharacter(assm, v0, t1);
106  }
107  StringHelper::GenerateHashGetHash(assm, v0);
108  __ jr(ra);
109#endif
110}
111
112
113void check(i::Vector<const char> string) {
114  v8::HandleScope scope;
115  v8::internal::byte buffer[2048];
116  MacroAssembler assm(Isolate::Current(), buffer, sizeof buffer);
117
118  generate(&assm, string);
119
120  CodeDesc desc;
121  assm.GetCode(&desc);
122  Code* code = Code::cast(HEAP->CreateCode(
123      desc,
124      Code::ComputeFlags(Code::STUB),
125      Handle<Object>(HEAP->undefined_value()))->ToObjectChecked());
126  CHECK(code->IsCode());
127
128  HASH_FUNCTION hash = FUNCTION_CAST<HASH_FUNCTION>(Code::cast(code)->entry());
129  Handle<String> v8_string = FACTORY->NewStringFromAscii(string);
130  v8_string->set_hash_field(String::kEmptyHashField);
131#ifdef USE_SIMULATOR
132  uint32_t codegen_hash =
133      reinterpret_cast<uint32_t>(CALL_GENERATED_CODE(hash, 0, 0, 0, 0, 0));
134#else
135  uint32_t codegen_hash = hash();
136#endif
137  uint32_t runtime_hash = v8_string->Hash();
138  CHECK(runtime_hash == codegen_hash);
139}
140
141
142void check_twochars(char a, char b) {
143  char ab[2] = {a, b};
144  check(i::Vector<const char>(ab, 2));
145}
146
147
148TEST(StringHash) {
149  if (env.IsEmpty()) env = v8::Context::New();
150  for (int a = 0; a < String::kMaxAsciiCharCode; a++) {
151    // Numbers are hashed differently.
152    if (a >= '0' && a <= '9') continue;
153    for (int b = 0; b < String::kMaxAsciiCharCode; b++) {
154      if (b >= '0' && b <= '9') continue;
155      check_twochars(static_cast<char>(a), static_cast<char>(b));
156    }
157  }
158  check(i::Vector<const char>("",        0));
159  check(i::Vector<const char>("*",       1));
160  check(i::Vector<const char>(".zZ",     3));
161  check(i::Vector<const char>("muc",     3));
162  check(i::Vector<const char>("(>'_')>", 7));
163  check(i::Vector<const char>("-=[ vee eight ftw ]=-", 21));
164}
165
166#undef __
167