v8/test/cctest/test-strings.cc

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// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Check that we can traverse very deep stacks of ConsStrings using
// StringInputBuffer. Check that Get(int) works on very deep stacks
// of ConsStrings. These operations may not be very fast, but they
// should be possible without getting errors due to too deep recursion.
#include <stdlib.h>
#include "v8.h"
#include "api.h"
#include "factory.h"
#include "cctest.h"
#include "zone-inl.h"
unsigned int seed = 123;
static uint32_t gen() {
uint64_t z;
z = seed;
z *= 279470273;
z %= 4294967291U;
seed = static_cast<unsigned int>(z);
return static_cast<uint32_t>(seed >> 16);
}
using namespace v8::internal;
static v8::Persistent<v8::Context> env;
static void InitializeVM() {
if (env.IsEmpty()) {
v8::HandleScope scope;
const char* extensions[] = { "v8/print" };
v8::ExtensionConfiguration config(1, extensions);
env = v8::Context::New(&config);
}
v8::HandleScope scope;
env->Enter();
}
static const int NUMBER_OF_BUILDING_BLOCKS = 128;
static const int DEEP_DEPTH = 8 * 1024;
static const int SUPER_DEEP_DEPTH = 80 * 1024;
static void InitializeBuildingBlocks(
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS]) {
// A list of pointers that we don't have any interest in cleaning up.
// If they are reachable from a root then leak detection won't complain.
for (int i = 0; i < NUMBER_OF_BUILDING_BLOCKS; i++) {
int len = gen() % 16;
if (len > 14) {
len += 1234;
}
switch (gen() % 4) {
case 0: {
uc16 buf[2000];
for (int j = 0; j < len; j++) {
buf[j] = gen() % 65536;
}
building_blocks[i] =
Factory::NewStringFromTwoByte(Vector<const uc16>(buf, len));
for (int j = 0; j < len; j++) {
CHECK_EQ(buf[j], building_blocks[i]->Get(j));
}
break;
}
case 1: {
char buf[2000];
for (int j = 0; j < len; j++) {
buf[j] = gen() % 128;
}
building_blocks[i] =
Factory::NewStringFromAscii(Vector<const char>(buf, len));
for (int j = 0; j < len; j++) {
CHECK_EQ(buf[j], building_blocks[i]->Get(j));
}
break;
}
case 2: {
class Resource: public v8::String::ExternalStringResource,
public ZoneObject {
public:
explicit Resource(Vector<const uc16> string): data_(string.start()) {
length_ = string.length();
}
virtual const uint16_t* data() const { return data_; }
virtual size_t length() const { return length_; }
private:
const uc16* data_;
size_t length_;
};
uc16* buf = Zone::NewArray<uc16>(len);
for (int j = 0; j < len; j++) {
buf[j] = gen() % 65536;
}
Resource* resource = new Resource(Vector<const uc16>(buf, len));
building_blocks[i] = Factory::NewExternalStringFromTwoByte(resource);
for (int j = 0; j < len; j++) {
CHECK_EQ(buf[j], building_blocks[i]->Get(j));
}
break;
}
case 3: {
char* buf = NewArray<char>(len);
for (int j = 0; j < len; j++) {
buf[j] = gen() % 128;
}
building_blocks[i] =
Factory::NewStringFromAscii(Vector<const char>(buf, len));
for (int j = 0; j < len; j++) {
CHECK_EQ(buf[j], building_blocks[i]->Get(j));
}
DeleteArray<char>(buf);
break;
}
}
}
}
static Handle<String> ConstructLeft(
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS],
int depth) {
Handle<String> answer = Factory::NewStringFromAscii(CStrVector(""));
for (int i = 0; i < depth; i++) {
answer = Factory::NewConsString(
answer,
building_blocks[i % NUMBER_OF_BUILDING_BLOCKS]);
}
return answer;
}
static Handle<String> ConstructRight(
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS],
int depth) {
Handle<String> answer = Factory::NewStringFromAscii(CStrVector(""));
for (int i = depth - 1; i >= 0; i--) {
answer = Factory::NewConsString(
building_blocks[i % NUMBER_OF_BUILDING_BLOCKS],
answer);
}
return answer;
}
static Handle<String> ConstructBalancedHelper(
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS],
int from,
int to) {
CHECK(to > from);
if (to - from == 1) {
return building_blocks[from % NUMBER_OF_BUILDING_BLOCKS];
}
if (to - from == 2) {
return Factory::NewConsString(
building_blocks[from % NUMBER_OF_BUILDING_BLOCKS],
building_blocks[(from+1) % NUMBER_OF_BUILDING_BLOCKS]);
}
Handle<String> part1 =
ConstructBalancedHelper(building_blocks, from, from + ((to - from) / 2));
Handle<String> part2 =
ConstructBalancedHelper(building_blocks, from + ((to - from) / 2), to);
return Factory::NewConsString(part1, part2);
}
static Handle<String> ConstructBalanced(
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS]) {
return ConstructBalancedHelper(building_blocks, 0, DEEP_DEPTH);
}
static StringInputBuffer buffer;
static void Traverse(Handle<String> s1, Handle<String> s2) {
int i = 0;
buffer.Reset(*s1);
StringInputBuffer buffer2(*s2);
while (buffer.has_more()) {
CHECK(buffer2.has_more());
uint16_t c = buffer.GetNext();
CHECK_EQ(c, buffer2.GetNext());
i++;
}
CHECK_EQ(s1->length(), i);
CHECK_EQ(s2->length(), i);
}
static void TraverseFirst(Handle<String> s1, Handle<String> s2, int chars) {
int i = 0;
buffer.Reset(*s1);
StringInputBuffer buffer2(*s2);
while (buffer.has_more() && i < chars) {
CHECK(buffer2.has_more());
uint16_t c = buffer.GetNext();
CHECK_EQ(c, buffer2.GetNext());
i++;
}
s1->Get(s1->length() - 1);
s2->Get(s2->length() - 1);
}
TEST(Traverse) {
printf("TestTraverse\n");
InitializeVM();
v8::HandleScope scope;
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS];
ZoneScope zone(DELETE_ON_EXIT);
InitializeBuildingBlocks(building_blocks);
Handle<String> flat = ConstructBalanced(building_blocks);
FlattenString(flat);
Handle<String> left_asymmetric = ConstructLeft(building_blocks, DEEP_DEPTH);
Handle<String> right_asymmetric = ConstructRight(building_blocks, DEEP_DEPTH);
Handle<String> symmetric = ConstructBalanced(building_blocks);
printf("1\n");
Traverse(flat, symmetric);
printf("2\n");
Traverse(flat, left_asymmetric);
printf("3\n");
Traverse(flat, right_asymmetric);
printf("4\n");
Handle<String> left_deep_asymmetric =
ConstructLeft(building_blocks, SUPER_DEEP_DEPTH);
Handle<String> right_deep_asymmetric =
ConstructRight(building_blocks, SUPER_DEEP_DEPTH);
printf("5\n");
TraverseFirst(left_asymmetric, left_deep_asymmetric, 1050);
printf("6\n");
TraverseFirst(left_asymmetric, right_deep_asymmetric, 65536);
printf("7\n");
Handle<String> right_deep_slice =
Factory::NewStringSlice(left_deep_asymmetric,
left_deep_asymmetric->length() - 1050,
left_deep_asymmetric->length() - 50);
Handle<String> left_deep_slice =
Factory::NewStringSlice(right_deep_asymmetric,
right_deep_asymmetric->length() - 1050,
right_deep_asymmetric->length() - 50);
printf("8\n");
Traverse(right_deep_slice, left_deep_slice);
printf("9\n");
FlattenString(left_asymmetric);
printf("10\n");
Traverse(flat, left_asymmetric);
printf("11\n");
FlattenString(right_asymmetric);
printf("12\n");
Traverse(flat, right_asymmetric);
printf("14\n");
FlattenString(symmetric);
printf("15\n");
Traverse(flat, symmetric);
printf("16\n");
FlattenString(left_deep_asymmetric);
printf("18\n");
}
static Handle<String> SliceOf(Handle<String> underlying) {
int start = gen() % underlying->length();
int end = start + gen() % (underlying->length() - start);
return Factory::NewStringSlice(underlying,
start,
end);
}
static Handle<String> ConstructSliceTree(
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS],
int from,
int to) {
CHECK(to > from);
if (to - from <= 1)
return SliceOf(building_blocks[from % NUMBER_OF_BUILDING_BLOCKS]);
if (to - from == 2) {
Handle<String> lhs = building_blocks[from % NUMBER_OF_BUILDING_BLOCKS];
if (gen() % 2 == 0)
lhs = SliceOf(lhs);
Handle<String> rhs = building_blocks[(from+1) % NUMBER_OF_BUILDING_BLOCKS];
if (gen() % 2 == 0)
rhs = SliceOf(rhs);
return Factory::NewConsString(lhs, rhs);
}
Handle<String> part1 =
ConstructBalancedHelper(building_blocks, from, from + ((to - from) / 2));
Handle<String> part2 =
ConstructBalancedHelper(building_blocks, from + ((to - from) / 2), to);
Handle<String> branch = Factory::NewConsString(part1, part2);
if (gen() % 2 == 0)
return branch;
return(SliceOf(branch));
}
TEST(Slice) {
printf("TestSlice\n");
InitializeVM();
v8::HandleScope scope;
Handle<String> building_blocks[NUMBER_OF_BUILDING_BLOCKS];
ZoneScope zone(DELETE_ON_EXIT);
InitializeBuildingBlocks(building_blocks);
seed = 42;
Handle<String> slice_tree =
ConstructSliceTree(building_blocks, 0, DEEP_DEPTH);
seed = 42;
Handle<String> flat_slice_tree =
ConstructSliceTree(building_blocks, 0, DEEP_DEPTH);
FlattenString(flat_slice_tree);
Traverse(flat_slice_tree, slice_tree);
}
static const int DEEP_ASCII_DEPTH = 100000;
TEST(DeepAscii) {
printf("TestDeepAscii\n");
InitializeVM();
v8::HandleScope scope;
char* foo = NewArray<char>(DEEP_ASCII_DEPTH);
for (int i = 0; i < DEEP_ASCII_DEPTH; i++) {
foo[i] = "foo "[i % 4];
}
Handle<String> string =
Factory::NewStringFromAscii(Vector<const char>(foo, DEEP_ASCII_DEPTH));
Handle<String> foo_string = Factory::NewStringFromAscii(CStrVector("foo"));
for (int i = 0; i < DEEP_ASCII_DEPTH; i += 10) {
string = Factory::NewConsString(string, foo_string);
}
Handle<String> flat_string = Factory::NewConsString(string, foo_string);
FlattenString(flat_string);
for (int i = 0; i < 500; i++) {
TraverseFirst(flat_string, string, DEEP_ASCII_DEPTH);
}
DeleteArray<char>(foo);
}
TEST(Utf8Conversion) {
// Smoke test for converting strings to utf-8.
InitializeVM();
v8::HandleScope handle_scope;
// A simple ascii string
const char* ascii_string = "abcdef12345";
int len = v8::String::New(ascii_string, strlen(ascii_string))->Utf8Length();
CHECK_EQ(strlen(ascii_string), len);
// A mixed ascii and non-ascii string
// U+02E4 -> CB A4
// U+0064 -> 64
// U+12E4 -> E1 8B A4
// U+0030 -> 30
// U+3045 -> E3 81 85
const uint16_t mixed_string[] = {0x02E4, 0x0064, 0x12E4, 0x0030, 0x3045};
// The characters we expect to be output
const unsigned char as_utf8[11] = {0xCB, 0xA4, 0x64, 0xE1, 0x8B, 0xA4, 0x30,
0xE3, 0x81, 0x85, 0x00};
// The number of bytes expected to be written for each length
const int lengths[12] = {0, 0, 2, 3, 3, 3, 6, 7, 7, 7, 10, 11};
v8::Handle<v8::String> mixed = v8::String::New(mixed_string, 5);
CHECK_EQ(10, mixed->Utf8Length());
// Try encoding the string with all capacities
char buffer[11];
const char kNoChar = static_cast<char>(-1);
for (int i = 0; i <= 11; i++) {
// Clear the buffer before reusing it
for (int j = 0; j < 11; j++)
buffer[j] = kNoChar;
int written = mixed->WriteUtf8(buffer, i);
CHECK_EQ(lengths[i], written);
// Check that the contents are correct
for (int j = 0; j < lengths[i]; j++)
CHECK_EQ(as_utf8[j], static_cast<unsigned char>(buffer[j]));
// Check that the rest of the buffer hasn't been touched
for (int j = lengths[i]; j < 11; j++)
CHECK_EQ(kNoChar, buffer[j]);
}
}
class TwoByteResource: public v8::String::ExternalStringResource {
public:
TwoByteResource(const uint16_t* data, size_t length, bool* destructed)
: data_(data), length_(length), destructed_(destructed) {
CHECK_NE(destructed, NULL);
*destructed_ = false;
}
virtual ~TwoByteResource() {
CHECK_NE(destructed_, NULL);
CHECK(!*destructed_);
*destructed_ = true;
}
const uint16_t* data() const { return data_; }
size_t length() const { return length_; }
private:
const uint16_t* data_;
size_t length_;
bool* destructed_;
};
// Regression test case for http://crbug.com/9746. The problem was
// that when we marked objects reachable only through weak pointers,
// we ended up keeping a sliced symbol alive, even though we already
// invoked the weak callback on the underlying external string thus
// deleting its resource.
TEST(Regress9746) {
InitializeVM();
// Setup lengths that guarantee we'll get slices instead of simple
// flat strings.
static const int kFullStringLength = String::kMinNonFlatLength * 2;
static const int kSliceStringLength = String::kMinNonFlatLength + 1;
uint16_t* source = new uint16_t[kFullStringLength];
for (int i = 0; i < kFullStringLength; i++) source[i] = '1';
char* key = new char[kSliceStringLength];
for (int i = 0; i < kSliceStringLength; i++) key[i] = '1';
Vector<const char> key_vector(key, kSliceStringLength);
// Allocate an external string resource that keeps track of when it
// is destructed.
bool resource_destructed = false;
TwoByteResource* resource =
new TwoByteResource(source, kFullStringLength, &resource_destructed);
{
v8::HandleScope scope;
// Allocate an external string resource and external string. We
// have to go through the API to get the weak handle and the
// automatic destruction going.
Handle<String> string =
v8::Utils::OpenHandle(*v8::String::NewExternal(resource));
// Create a slice of the external string.
Handle<String> slice =
Factory::NewStringSlice(string, 0, kSliceStringLength);
CHECK_EQ(kSliceStringLength, slice->length());
CHECK(StringShape(*slice).IsSliced());
// Make sure the slice ends up in old space so we can morph it
// into a symbol.
while (Heap::InNewSpace(*slice)) {
Heap::PerformScavenge();
}
// Force the slice into the symbol table.
slice = Factory::SymbolFromString(slice);
CHECK(slice->IsSymbol());
CHECK(StringShape(*slice).IsSliced());
Handle<String> buffer(Handle<SlicedString>::cast(slice)->buffer());
CHECK(StringShape(*buffer).IsExternal());
CHECK(buffer->IsTwoByteRepresentation());
// Finally, base a script on the slice of the external string and
// get its wrapper. This allocates yet another weak handle that
// indirectly refers to the external string.
Handle<Script> script = Factory::NewScript(slice);
Handle<JSObject> wrapper = GetScriptWrapper(script);
}
// When we collect all garbage, we cannot get rid of the sliced
// symbol entry in the symbol table because it is used by the script
// kept alive by the weak wrapper. Make sure we don't destruct the
// external string.
Heap::CollectAllGarbage(false);
CHECK(!resource_destructed);
{
v8::HandleScope scope;
// Make sure the sliced symbol is still in the table.
Handle<String> symbol = Factory::LookupSymbol(key_vector);
CHECK(StringShape(*symbol).IsSliced());
// Make sure the buffer is still a two-byte external string.
Handle<String> buffer(Handle<SlicedString>::cast(symbol)->buffer());
CHECK(StringShape(*buffer).IsExternal());
CHECK(buffer->IsTwoByteRepresentation());
}
// Forcing another garbage collection should let us get rid of the
// slice from the symbol table. The external string remains in the
// heap until the next GC.
Heap::CollectAllGarbage(false);
CHECK(!resource_destructed);
v8::HandleScope scope;
Handle<String> key_string = Factory::NewStringFromAscii(key_vector);
String* out;
CHECK(!Heap::LookupSymbolIfExists(*key_string, &out));
// Forcing yet another garbage collection must allow us to finally
// get rid of the external string.
Heap::CollectAllGarbage(false);
CHECK(resource_destructed);
delete[] source;
delete[] key;
}