root/src/string-stream.cc
/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- allocate
- Put
- IsControlChar
- Add
- PrintObject
- Add
- Add
- Add
- Add
- Add
- Add
- ToCString
- Log
- OutputToFile
- ToString
- ClearMentionedObjectCache
- IsMentionedObjectCacheClear
- Put
- Put
- PrintName
- PrintUsingMap
- PrintFixedArray
- PrintByteArray
- PrintMentionedObjectCache
- PrintSecurityTokenIfChanged
- PrintFunction
- PrintPrototype
- grow
- grow
// Copyright 2012 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 "v8.h"
#include "factory.h"
#include "string-stream.h"
#include "allocation-inl.h"
namespace v8 {
namespace internal {
static const int kMentionedObjectCacheMaxSize = 256;
char* HeapStringAllocator::allocate(unsigned bytes) {
space_ = NewArray<char>(bytes);
return space_;
}
NoAllocationStringAllocator::NoAllocationStringAllocator(char* memory,
unsigned size) {
size_ = size;
space_ = memory;
}
bool StringStream::Put(char c) {
if (full()) return false;
ASSERT(length_ < capacity_);
// Since the trailing '\0' is not accounted for in length_ fullness is
// indicated by a difference of 1 between length_ and capacity_. Thus when
// reaching a difference of 2 we need to grow the buffer.
if (length_ == capacity_ - 2) {
unsigned new_capacity = capacity_;
char* new_buffer = allocator_->grow(&new_capacity);
if (new_capacity > capacity_) {
capacity_ = new_capacity;
buffer_ = new_buffer;
} else {
// Reached the end of the available buffer.
ASSERT(capacity_ >= 5);
length_ = capacity_ - 1; // Indicate fullness of the stream.
buffer_[length_ - 4] = '.';
buffer_[length_ - 3] = '.';
buffer_[length_ - 2] = '.';
buffer_[length_ - 1] = '\n';
buffer_[length_] = '\0';
return false;
}
}
buffer_[length_] = c;
buffer_[length_ + 1] = '\0';
length_++;
return true;
}
// A control character is one that configures a format element. For
// instance, in %.5s, .5 are control characters.
static bool IsControlChar(char c) {
switch (c) {
case '0': case '1': case '2': case '3': case '4': case '5':
case '6': case '7': case '8': case '9': case '.': case '-':
return true;
default:
return false;
}
}
void StringStream::Add(Vector<const char> format, Vector<FmtElm> elms) {
// If we already ran out of space then return immediately.
if (full()) return;
int offset = 0;
int elm = 0;
while (offset < format.length()) {
if (format[offset] != '%' || elm == elms.length()) {
Put(format[offset]);
offset++;
continue;
}
// Read this formatting directive into a temporary buffer
EmbeddedVector<char, 24> temp;
int format_length = 0;
// Skip over the whole control character sequence until the
// format element type
temp[format_length++] = format[offset++];
while (offset < format.length() && IsControlChar(format[offset]))
temp[format_length++] = format[offset++];
if (offset >= format.length())
return;
char type = format[offset];
temp[format_length++] = type;
temp[format_length] = '\0';
offset++;
FmtElm current = elms[elm++];
switch (type) {
case 's': {
ASSERT_EQ(FmtElm::C_STR, current.type_);
const char* value = current.data_.u_c_str_;
Add(value);
break;
}
case 'w': {
ASSERT_EQ(FmtElm::LC_STR, current.type_);
Vector<const uc16> value = *current.data_.u_lc_str_;
for (int i = 0; i < value.length(); i++)
Put(static_cast<char>(value[i]));
break;
}
case 'o': {
ASSERT_EQ(FmtElm::OBJ, current.type_);
Object* obj = current.data_.u_obj_;
PrintObject(obj);
break;
}
case 'k': {
ASSERT_EQ(FmtElm::INT, current.type_);
int value = current.data_.u_int_;
if (0x20 <= value && value <= 0x7F) {
Put(value);
} else if (value <= 0xff) {
Add("\\x%02x", value);
} else {
Add("\\u%04x", value);
}
break;
}
case 'i': case 'd': case 'u': case 'x': case 'c': case 'X': {
int value = current.data_.u_int_;
EmbeddedVector<char, 24> formatted;
int length = OS::SNPrintF(formatted, temp.start(), value);
Add(Vector<const char>(formatted.start(), length));
break;
}
case 'f': case 'g': case 'G': case 'e': case 'E': {
double value = current.data_.u_double_;
EmbeddedVector<char, 28> formatted;
OS::SNPrintF(formatted, temp.start(), value);
Add(formatted.start());
break;
}
case 'p': {
void* value = current.data_.u_pointer_;
EmbeddedVector<char, 20> formatted;
OS::SNPrintF(formatted, temp.start(), value);
Add(formatted.start());
break;
}
default:
UNREACHABLE();
break;
}
}
// Verify that the buffer is 0-terminated
ASSERT(buffer_[length_] == '\0');
}
void StringStream::PrintObject(Object* o) {
o->ShortPrint(this);
if (o->IsString()) {
if (String::cast(o)->length() <= String::kMaxShortPrintLength) {
return;
}
} else if (o->IsNumber() || o->IsOddball()) {
return;
}
if (o->IsHeapObject()) {
DebugObjectCache* debug_object_cache = Isolate::Current()->
string_stream_debug_object_cache();
for (int i = 0; i < debug_object_cache->length(); i++) {
if ((*debug_object_cache)[i] == o) {
Add("#%d#", i);
return;
}
}
if (debug_object_cache->length() < kMentionedObjectCacheMaxSize) {
Add("#%d#", debug_object_cache->length());
debug_object_cache->Add(HeapObject::cast(o));
} else {
Add("@%p", o);
}
}
}
void StringStream::Add(const char* format) {
Add(CStrVector(format));
}
void StringStream::Add(Vector<const char> format) {
Add(format, Vector<FmtElm>::empty());
}
void StringStream::Add(const char* format, FmtElm arg0) {
const char argc = 1;
FmtElm argv[argc] = { arg0 };
Add(CStrVector(format), Vector<FmtElm>(argv, argc));
}
void StringStream::Add(const char* format, FmtElm arg0, FmtElm arg1) {
const char argc = 2;
FmtElm argv[argc] = { arg0, arg1 };
Add(CStrVector(format), Vector<FmtElm>(argv, argc));
}
void StringStream::Add(const char* format, FmtElm arg0, FmtElm arg1,
FmtElm arg2) {
const char argc = 3;
FmtElm argv[argc] = { arg0, arg1, arg2 };
Add(CStrVector(format), Vector<FmtElm>(argv, argc));
}
void StringStream::Add(const char* format, FmtElm arg0, FmtElm arg1,
FmtElm arg2, FmtElm arg3) {
const char argc = 4;
FmtElm argv[argc] = { arg0, arg1, arg2, arg3 };
Add(CStrVector(format), Vector<FmtElm>(argv, argc));
}
SmartArrayPointer<const char> StringStream::ToCString() const {
char* str = NewArray<char>(length_ + 1);
memcpy(str, buffer_, length_);
str[length_] = '\0';
return SmartArrayPointer<const char>(str);
}
void StringStream::Log() {
LOG(ISOLATE, StringEvent("StackDump", buffer_));
}
void StringStream::OutputToFile(FILE* out) {
// Dump the output to stdout, but make sure to break it up into
// manageable chunks to avoid losing parts of the output in the OS
// printing code. This is a problem on Windows in particular; see
// the VPrint() function implementations in platform-win32.cc.
unsigned position = 0;
for (unsigned next; (next = position + 2048) < length_; position = next) {
char save = buffer_[next];
buffer_[next] = '\0';
internal::PrintF(out, "%s", &buffer_[position]);
buffer_[next] = save;
}
internal::PrintF(out, "%s", &buffer_[position]);
}
Handle<String> StringStream::ToString() {
return FACTORY->NewStringFromUtf8(Vector<const char>(buffer_, length_));
}
void StringStream::ClearMentionedObjectCache() {
Isolate* isolate = Isolate::Current();
isolate->set_string_stream_current_security_token(NULL);
if (isolate->string_stream_debug_object_cache() == NULL) {
isolate->set_string_stream_debug_object_cache(
new List<HeapObject*, PreallocatedStorageAllocationPolicy>(0));
}
isolate->string_stream_debug_object_cache()->Clear();
}
#ifdef DEBUG
bool StringStream::IsMentionedObjectCacheClear() {
return (
Isolate::Current()->string_stream_debug_object_cache()->length() == 0);
}
#endif
bool StringStream::Put(String* str) {
return Put(str, 0, str->length());
}
bool StringStream::Put(String* str, int start, int end) {
StringInputBuffer name_buffer(str);
name_buffer.Seek(start);
for (int i = start; i < end && name_buffer.has_more(); i++) {
int c = name_buffer.GetNext();
if (c >= 127 || c < 32) {
c = '?';
}
if (!Put(c)) {
return false; // Output was truncated.
}
}
return true;
}
void StringStream::PrintName(Object* name) {
if (name->IsString()) {
String* str = String::cast(name);
if (str->length() > 0) {
Put(str);
} else {
Add("/* anonymous */");
}
} else {
Add("%o", name);
}
}
void StringStream::PrintUsingMap(JSObject* js_object) {
Map* map = js_object->map();
if (!HEAP->Contains(map) ||
!map->IsHeapObject() ||
!map->IsMap()) {
Add("<Invalid map>\n");
return;
}
DescriptorArray* descs = map->instance_descriptors();
for (int i = 0; i < descs->number_of_descriptors(); i++) {
if (descs->GetType(i) == FIELD) {
Object* key = descs->GetKey(i);
if (key->IsString() || key->IsNumber()) {
int len = 3;
if (key->IsString()) {
len = String::cast(key)->length();
}
for (; len < 18; len++)
Put(' ');
if (key->IsString()) {
Put(String::cast(key));
} else {
key->ShortPrint();
}
Add(": ");
Object* value = js_object->FastPropertyAt(descs->GetFieldIndex(i));
Add("%o\n", value);
}
}
}
}
void StringStream::PrintFixedArray(FixedArray* array, unsigned int limit) {
Heap* heap = HEAP;
for (unsigned int i = 0; i < 10 && i < limit; i++) {
Object* element = array->get(i);
if (element != heap->the_hole_value()) {
for (int len = 1; len < 18; len++)
Put(' ');
Add("%d: %o\n", i, array->get(i));
}
}
if (limit >= 10) {
Add(" ...\n");
}
}
void StringStream::PrintByteArray(ByteArray* byte_array) {
unsigned int limit = byte_array->length();
for (unsigned int i = 0; i < 10 && i < limit; i++) {
byte b = byte_array->get(i);
Add(" %d: %3d 0x%02x", i, b, b);
if (b >= ' ' && b <= '~') {
Add(" '%c'", b);
} else if (b == '\n') {
Add(" '\n'");
} else if (b == '\r') {
Add(" '\r'");
} else if (b >= 1 && b <= 26) {
Add(" ^%c", b + 'A' - 1);
}
Add("\n");
}
if (limit >= 10) {
Add(" ...\n");
}
}
void StringStream::PrintMentionedObjectCache() {
DebugObjectCache* debug_object_cache =
Isolate::Current()->string_stream_debug_object_cache();
Add("==== Key ============================================\n\n");
for (int i = 0; i < debug_object_cache->length(); i++) {
HeapObject* printee = (*debug_object_cache)[i];
Add(" #%d# %p: ", i, printee);
printee->ShortPrint(this);
Add("\n");
if (printee->IsJSObject()) {
if (printee->IsJSValue()) {
Add(" value(): %o\n", JSValue::cast(printee)->value());
}
PrintUsingMap(JSObject::cast(printee));
if (printee->IsJSArray()) {
JSArray* array = JSArray::cast(printee);
if (array->HasFastObjectElements()) {
unsigned int limit = FixedArray::cast(array->elements())->length();
unsigned int length =
static_cast<uint32_t>(JSArray::cast(array)->length()->Number());
if (length < limit) limit = length;
PrintFixedArray(FixedArray::cast(array->elements()), limit);
}
}
} else if (printee->IsByteArray()) {
PrintByteArray(ByteArray::cast(printee));
} else if (printee->IsFixedArray()) {
unsigned int limit = FixedArray::cast(printee)->length();
PrintFixedArray(FixedArray::cast(printee), limit);
}
}
}
void StringStream::PrintSecurityTokenIfChanged(Object* f) {
Isolate* isolate = Isolate::Current();
Heap* heap = isolate->heap();
if (!f->IsHeapObject() || !heap->Contains(HeapObject::cast(f))) {
return;
}
Map* map = HeapObject::cast(f)->map();
if (!map->IsHeapObject() ||
!heap->Contains(map) ||
!map->IsMap() ||
!f->IsJSFunction()) {
return;
}
JSFunction* fun = JSFunction::cast(f);
Object* perhaps_context = fun->unchecked_context();
if (perhaps_context->IsHeapObject() &&
heap->Contains(HeapObject::cast(perhaps_context)) &&
perhaps_context->IsContext()) {
Context* context = fun->context();
if (!heap->Contains(context)) {
Add("(Function context is outside heap)\n");
return;
}
Object* token = context->global_context()->security_token();
if (token != isolate->string_stream_current_security_token()) {
Add("Security context: %o\n", token);
isolate->set_string_stream_current_security_token(token);
}
} else {
Add("(Function context is corrupt)\n");
}
}
void StringStream::PrintFunction(Object* f, Object* receiver, Code** code) {
if (f->IsHeapObject() &&
HEAP->Contains(HeapObject::cast(f)) &&
HEAP->Contains(HeapObject::cast(f)->map()) &&
HeapObject::cast(f)->map()->IsMap()) {
if (f->IsJSFunction()) {
JSFunction* fun = JSFunction::cast(f);
// Common case: on-stack function present and resolved.
PrintPrototype(fun, receiver);
*code = fun->code();
} else if (f->IsSymbol()) {
// Unresolved and megamorphic calls: Instead of the function
// we have the function name on the stack.
PrintName(f);
Add("/* unresolved */ ");
} else {
// Unless this is the frame of a built-in function, we should always have
// the callee function or name on the stack. If we don't, we have a
// problem or a change of the stack frame layout.
Add("%o", f);
Add("/* warning: no JSFunction object or function name found */ ");
}
/* } else if (is_trampoline()) {
Print("trampoline ");
*/
} else {
if (!f->IsHeapObject()) {
Add("/* warning: 'function' was not a heap object */ ");
return;
}
if (!HEAP->Contains(HeapObject::cast(f))) {
Add("/* warning: 'function' was not on the heap */ ");
return;
}
if (!HEAP->Contains(HeapObject::cast(f)->map())) {
Add("/* warning: function's map was not on the heap */ ");
return;
}
if (!HeapObject::cast(f)->map()->IsMap()) {
Add("/* warning: function's map was not a valid map */ ");
return;
}
Add("/* warning: Invalid JSFunction object found */ ");
}
}
void StringStream::PrintPrototype(JSFunction* fun, Object* receiver) {
Object* name = fun->shared()->name();
bool print_name = false;
Heap* heap = HEAP;
for (Object* p = receiver; p != heap->null_value(); p = p->GetPrototype()) {
if (p->IsJSObject()) {
Object* key = JSObject::cast(p)->SlowReverseLookup(fun);
if (key != heap->undefined_value()) {
if (!name->IsString() ||
!key->IsString() ||
!String::cast(name)->Equals(String::cast(key))) {
print_name = true;
}
if (name->IsString() && String::cast(name)->length() == 0) {
print_name = false;
}
name = key;
}
} else {
print_name = true;
}
}
PrintName(name);
// Also known as - if the name in the function doesn't match the name under
// which it was looked up.
if (print_name) {
Add("(aka ");
PrintName(fun->shared()->name());
Put(')');
}
}
char* HeapStringAllocator::grow(unsigned* bytes) {
unsigned new_bytes = *bytes * 2;
// Check for overflow.
if (new_bytes <= *bytes) {
return space_;
}
char* new_space = NewArray<char>(new_bytes);
if (new_space == NULL) {
return space_;
}
memcpy(new_space, space_, *bytes);
*bytes = new_bytes;
DeleteArray(space_);
space_ = new_space;
return new_space;
}
// Only grow once to the maximum allowable size.
char* NoAllocationStringAllocator::grow(unsigned* bytes) {
ASSERT(size_ >= *bytes);
*bytes = size_;
return space_;
}
} } // namespace v8::internal