v8/test/cctest/test-hashing.cc

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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// 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
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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)();
#define __ masm->
void generate(MacroAssembler* masm, i::Vector<const uint8_t> string) {
// GenerateHashInit takes the first character as an argument so it can't
// handle the zero length string.
ASSERT(string.length() > 0);
#ifdef V8_TARGET_ARCH_IA32
__ push(ebx);
__ push(ecx);
__ mov(eax, Immediate(0));
__ mov(ebx, Immediate(string.at(0)));
StringHelper::GenerateHashInit(masm, eax, ebx, ecx);
for (int i = 1; i < string.length(); i++) {
__ mov(ebx, Immediate(string.at(i)));
StringHelper::GenerateHashAddCharacter(masm, eax, ebx, ecx);
}
StringHelper::GenerateHashGetHash(masm, eax, ecx);
__ pop(ecx);
__ pop(ebx);
__ Ret();
#elif V8_TARGET_ARCH_X64
__ push(kRootRegister);
__ InitializeRootRegister();
__ push(rbx);
__ push(rcx);
__ movq(rax, Immediate(0));
__ movq(rbx, Immediate(string.at(0)));
StringHelper::GenerateHashInit(masm, rax, rbx, rcx);
for (int i = 1; i < string.length(); i++) {
__ movq(rbx, Immediate(string.at(i)));
StringHelper::GenerateHashAddCharacter(masm, rax, rbx, rcx);
}
StringHelper::GenerateHashGetHash(masm, rax, rcx);
__ pop(rcx);
__ pop(rbx);
__ pop(kRootRegister);
__ Ret();
#elif V8_TARGET_ARCH_ARM
__ push(kRootRegister);
__ InitializeRootRegister();
__ mov(r0, Operand(0));
__ mov(ip, Operand(string.at(0)));
StringHelper::GenerateHashInit(masm, r0, ip);
for (int i = 1; i < string.length(); i++) {
__ mov(ip, Operand(string.at(i)));
StringHelper::GenerateHashAddCharacter(masm, r0, ip);
}
StringHelper::GenerateHashGetHash(masm, r0);
__ pop(kRootRegister);
__ mov(pc, Operand(lr));
#elif V8_TARGET_ARCH_MIPS
__ push(kRootRegister);
__ InitializeRootRegister();
__ li(v0, Operand(0));
__ li(t1, Operand(string.at(0)));
StringHelper::GenerateHashInit(masm, v0, t1);
for (int i = 1; i < string.length(); i++) {
__ li(t1, Operand(string.at(i)));
StringHelper::GenerateHashAddCharacter(masm, v0, t1);
}
StringHelper::GenerateHashGetHash(masm, v0);
__ pop(kRootRegister);
__ jr(ra);
__ nop();
#endif
}
void generate(MacroAssembler* masm, uint32_t key) {
#ifdef V8_TARGET_ARCH_IA32
__ push(ebx);
__ mov(eax, Immediate(key));
__ GetNumberHash(eax, ebx);
__ pop(ebx);
__ Ret();
#elif V8_TARGET_ARCH_X64
__ push(kRootRegister);
__ InitializeRootRegister();
__ push(rbx);
__ movq(rax, Immediate(key));
__ GetNumberHash(rax, rbx);
__ pop(rbx);
__ pop(kRootRegister);
__ Ret();
#elif V8_TARGET_ARCH_ARM
__ push(kRootRegister);
__ InitializeRootRegister();
__ mov(r0, Operand(key));
__ GetNumberHash(r0, ip);
__ pop(kRootRegister);
__ mov(pc, Operand(lr));
#elif V8_TARGET_ARCH_MIPS
__ push(kRootRegister);
__ InitializeRootRegister();
__ li(v0, Operand(key));
__ GetNumberHash(v0, t1);
__ pop(kRootRegister);
__ jr(ra);
__ nop();
#endif
}
void check(i::Vector<const uint8_t> string) {
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
v8::internal::byte buffer[2048];
MacroAssembler masm(isolate, buffer, sizeof buffer);
generate(&masm, string);
CodeDesc desc;
masm.GetCode(&desc);
Handle<Object> undefined(isolate->heap()->undefined_value(), isolate);
Handle<Code> code = factory->NewCode(desc,
Code::ComputeFlags(Code::STUB),
undefined);
CHECK(code->IsCode());
HASH_FUNCTION hash = FUNCTION_CAST<HASH_FUNCTION>(code->entry());
Handle<String> v8_string = factory->NewStringFromOneByte(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(i::Vector<const char> s) {
check(i::Vector<const uint8_t>::cast(s));
}
void check(uint32_t key) {
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
v8::internal::byte buffer[2048];
MacroAssembler masm(Isolate::Current(), buffer, sizeof buffer);
generate(&masm, key);
CodeDesc desc;
masm.GetCode(&desc);
Handle<Object> undefined(isolate->heap()->undefined_value(), isolate);
Handle<Code> code = factory->NewCode(desc,
Code::ComputeFlags(Code::STUB),
undefined);
CHECK(code->IsCode());
HASH_FUNCTION hash = FUNCTION_CAST<HASH_FUNCTION>(code->entry());
#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 = ComputeIntegerHash(key, isolate->heap()->HashSeed());
CHECK(runtime_hash == codegen_hash);
}
void check_twochars(uint8_t a, uint8_t b) {
uint8_t ab[2] = {a, b};
check(i::Vector<const uint8_t>(ab, 2));
}
static uint32_t PseudoRandom(uint32_t i, uint32_t j) {
return ~(~((i * 781) ^ (j * 329)));
}
TEST(StringHash) {
v8::Isolate* isolate = v8::Isolate::GetCurrent();
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(v8::Context::New(isolate));
for (uint8_t a = 0; a < String::kMaxOneByteCharCode; a++) {
// Numbers are hashed differently.
if (a >= '0' && a <= '9') continue;
for (uint8_t b = 0; b < String::kMaxOneByteCharCode; b++) {
if (b >= '0' && b <= '9') continue;
check_twochars(a, b);
}
}
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));
}
TEST(NumberHash) {
v8::Isolate* isolate = v8::Isolate::GetCurrent();
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(v8::Context::New(isolate));
// Some specific numbers
for (uint32_t key = 0; key < 42; key += 7) {
check(key);
}
// Some pseudo-random numbers
static const uint32_t kLimit = 1000;
for (uint32_t i = 0; i < 5; i++) {
for (uint32_t j = 0; j < 5; j++) {
check(PseudoRandom(i, j) % kLimit);
}
}
}
#undef __