v8/test/cctest/test-hashing.cc

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
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#include <stdlib.h>

#include "v8.h"

#include "factory.h"
#include "macro-assembler.h"
#include "cctest.h"
#include "code-stubs.h"
#include "objects.h"

#ifdef USE_SIMULATOR
#include "simulator.h"
#endif

using namespace v8::internal;


typedef uint32_t (*HASH_FUNCTION)();

static v8::Persistent<v8::Context> env;

#define __ assm->


void generate(MacroAssembler* assm, i::Vector<const char> string) {
#ifdef V8_TARGET_ARCH_IA32
  __ mov(eax, Immediate(0));
  if (string.length() > 0) {
    __ mov(ebx, Immediate(string.at(0)));
    StringHelper::GenerateHashInit(assm, eax, ebx, ecx);
  }
  for (int i = 1; i < string.length(); i++) {
    __ mov(ebx, Immediate(string.at(i)));
    StringHelper::GenerateHashAddCharacter(assm, eax, ebx, ecx);
  }
  StringHelper::GenerateHashGetHash(assm, eax, ecx);
  __ Ret();
#elif V8_TARGET_ARCH_X64
  __ movq(rax, Immediate(0));
  if (string.length() > 0) {
    __ movq(rbx, Immediate(string.at(0)));
    StringHelper::GenerateHashInit(assm, rax, rbx, rcx);
  }
  for (int i = 1; i < string.length(); i++) {
    __ movq(rbx, Immediate(string.at(i)));
    StringHelper::GenerateHashAddCharacter(assm, rax, rbx, rcx);
  }
  StringHelper::GenerateHashGetHash(assm, rax, rcx);
  __ Ret();
#elif V8_TARGET_ARCH_ARM
  __ mov(r0, Operand(0));
  if (string.length() > 0) {
    __ mov(r1, Operand(string.at(0)));
    StringHelper::GenerateHashInit(assm, r0, r1);
  }
  for (int i = 1; i < string.length(); i++) {
    __ mov(r1, Operand(string.at(i)));
    StringHelper::GenerateHashAddCharacter(assm, r0, r1);
  }
  StringHelper::GenerateHashGetHash(assm, r0);
  __ mov(pc, Operand(lr));
#elif V8_TARGET_ARCH_MIPS
  __ li(v0, Operand(0));
  if (string.length() > 0) {
    __ li(v1, Operand(string.at(0)));
    StringHelper::GenerateHashInit(assm, v0, v1);
  }
  for (int i = 1; i < string.length(); i++) {
    __ li(v1, Operand(string.at(i)));
    StringHelper::GenerateHashAddCharacter(assm, v0, v1);
  }
  StringHelper::GenerateHashGetHash(assm, v0);
  __ jr(ra);
#endif
}


void check(i::Vector<const char> string) {
  v8::HandleScope scope;
  v8::internal::byte buffer[2048];
  MacroAssembler assm(Isolate::Current(), buffer, sizeof buffer);

  generate(&assm, string);

  CodeDesc desc;
  assm.GetCode(&desc);
  Code* code = Code::cast(HEAP->CreateCode(
      desc,
      Code::ComputeFlags(Code::STUB),
      Handle<Object>(HEAP->undefined_value()))->ToObjectChecked());
  CHECK(code->IsCode());

  HASH_FUNCTION hash = FUNCTION_CAST<HASH_FUNCTION>(Code::cast(code)->entry());
  Handle<String> v8_string = FACTORY->NewStringFromAscii(string);
  v8_string->set_hash_field(String::kEmptyHashField);
#ifdef USE_SIMULATOR
  uint32_t codegen_hash =
      reinterpret_cast<uint32_t>(CALL_GENERATED_CODE(hash, 0, 0, 0, 0, 0));
#else
  uint32_t codegen_hash = hash();
#endif
  uint32_t runtime_hash = v8_string->Hash();
  CHECK(runtime_hash == codegen_hash);
}


void check_twochars(char a, char b) {
  char ab[2] = {a, b};
  check(i::Vector<const char>(ab, 2));
}


TEST(StringHash) {
  if (env.IsEmpty()) env = v8::Context::New();
  for (int a = 0; a < String::kMaxAsciiCharCode; a++) {
    // Numbers are hashed differently.
    if (a >= '0' && a <= '9') continue;
    for (int b = 0; b < String::kMaxAsciiCharCode; b++) {
      if (b >= '0' && b <= '9') continue;
      check_twochars(static_cast<char>(a), static_cast<char>(b));
    }
  }
  check(i::Vector<const char>("",        0));
  check(i::Vector<const char>("*",       1));
  check(i::Vector<const char>(".zZ",     3));
  check(i::Vector<const char>("muc",     3));
  check(i::Vector<const char>("(>'_')>", 7));
  check(i::Vector<const char>("-=[ vee eight ftw ]=-", 21));
}

#undef __