// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-#ifdef ENABLE_GDB_JIT_INTERFACE
#include "src/v8.h"
#include "src/base/bits.h"
#include "src/global-handles.h"
#include "src/messages.h"
#include "src/natives.h"
+#include "src/objects.h"
#include "src/ostreams.h"
-#include "src/scopes.h"
namespace v8 {
namespace internal {
+namespace GDBJITInterface {
+
+#ifdef ENABLE_GDB_JIT_INTERFACE
#ifdef __APPLE__
#define __MACH_O
};
#endif
- CodeDescription(const char* name, Code* code, Handle<Script> script,
- LineInfo* lineinfo, GDBJITInterface::CodeTag tag,
- CompilationInfo* info)
- : name_(name),
- code_(code),
- script_(script),
- lineinfo_(lineinfo),
- tag_(tag),
- info_(info) {}
+ CodeDescription(const char* name, Code* code, SharedFunctionInfo* shared,
+ LineInfo* lineinfo)
+ : name_(name), code_(code), shared_info_(shared), lineinfo_(lineinfo) {}
const char* name() const {
return name_;
LineInfo* lineinfo() const { return lineinfo_; }
- GDBJITInterface::CodeTag tag() const {
- return tag_;
+ bool is_function() const {
+ Code::Kind kind = code_->kind();
+ return kind == Code::FUNCTION || kind == Code::OPTIMIZED_FUNCTION;
}
- CompilationInfo* info() const {
- return info_;
- }
+ bool has_scope_info() const { return shared_info_ != NULL; }
- bool IsInfoAvailable() const {
- return info_ != NULL;
+ ScopeInfo* scope_info() const {
+ DCHECK(has_scope_info());
+ return shared_info_->scope_info();
}
uintptr_t CodeStart() const {
return CodeEnd() - CodeStart();
}
+ bool has_script() {
+ return shared_info_ != NULL && shared_info_->script()->IsScript();
+ }
+
+ Script* script() { return Script::cast(shared_info_->script()); }
+
bool IsLineInfoAvailable() {
- return !script_.is_null() &&
- script_->source()->IsString() &&
- script_->HasValidSource() &&
- script_->name()->IsString() &&
- lineinfo_ != NULL;
+ return has_script() && script()->source()->IsString() &&
+ script()->HasValidSource() && script()->name()->IsString() &&
+ lineinfo_ != NULL;
}
#if V8_TARGET_ARCH_X64
#endif
SmartArrayPointer<char> GetFilename() {
- return String::cast(script_->name())->ToCString();
+ return String::cast(script()->name())->ToCString();
}
- int GetScriptLineNumber(int pos) {
- return script_->GetLineNumber(pos) + 1;
- }
+ int GetScriptLineNumber(int pos) { return script()->GetLineNumber(pos) + 1; }
private:
const char* name_;
Code* code_;
- Handle<Script> script_;
+ SharedFunctionInfo* shared_info_;
LineInfo* lineinfo_;
- GDBJITInterface::CodeTag tag_;
- CompilationInfo* info_;
#if V8_TARGET_ARCH_X64
uintptr_t stack_state_start_addresses_[STACK_STATE_MAX];
#endif
w->Write<uint8_t>(kPointerSize);
w->WriteString("v8value");
- if (desc_->IsInfoAvailable()) {
- Scope* scope = desc_->info()->scope();
+ if (desc_->has_scope_info()) {
+ ScopeInfo* scope = desc_->scope_info();
w->WriteULEB128(2);
w->WriteString(desc_->name());
w->Write<intptr_t>(desc_->CodeStart());
#endif
fb_block_size.set(static_cast<uint32_t>(w->position() - fb_block_start));
- int params = scope->num_parameters();
- int slots = scope->num_stack_slots();
+ int params = scope->ParameterCount();
+ int slots = scope->StackLocalCount();
int context_slots = scope->ContextLocalCount();
// The real slot ID is internal_slots + context_slot_id.
int internal_slots = Context::MIN_CONTEXT_SLOTS;
for (int param = 0; param < params; ++param) {
w->WriteULEB128(current_abbreviation++);
w->WriteString(
- scope->parameter(param)->name()->ToCString(DISALLOW_NULLS).get());
+ scope->ParameterName(param)->ToCString(DISALLOW_NULLS).get());
w->Write<uint32_t>(ty_offset);
Writer::Slot<uint32_t> block_size = w->CreateSlotHere<uint32_t>();
uintptr_t block_start = w->position();
w->WriteString(builder.Finalize());
}
- ZoneList<Variable*> stack_locals(locals, scope->zone());
- ZoneList<Variable*> context_locals(context_slots, scope->zone());
- scope->CollectStackAndContextLocals(&stack_locals, &context_locals);
for (int local = 0; local < locals; ++local) {
w->WriteULEB128(current_abbreviation++);
w->WriteString(
- stack_locals[local]->name()->ToCString(DISALLOW_NULLS).get());
+ scope->StackLocalName(local)->ToCString(DISALLOW_NULLS).get());
w->Write<uint32_t>(ty_offset);
Writer::Slot<uint32_t> block_size = w->CreateSlotHere<uint32_t>();
uintptr_t block_start = w->position();
bool WriteBodyInternal(Writer* w) {
int current_abbreviation = 1;
- bool extra_info = desc_->IsInfoAvailable();
+ bool extra_info = desc_->has_scope_info();
DCHECK(desc_->IsLineInfoAvailable());
w->WriteULEB128(current_abbreviation++);
w->WriteULEB128(DW_TAG_COMPILE_UNIT);
w->WriteULEB128(0);
if (extra_info) {
- Scope* scope = desc_->info()->scope();
- int params = scope->num_parameters();
- int slots = scope->num_stack_slots();
+ ScopeInfo* scope = desc_->scope_info();
+ int params = scope->ParameterCount();
+ int slots = scope->StackLocalCount();
int context_slots = scope->ContextLocalCount();
// The real slot ID is internal_slots + context_slot_id.
int internal_slots = Context::MIN_CONTEXT_SLOTS;
}
-static void RegisterCodeEntry(JITCodeEntry* entry,
- bool dump_if_enabled,
- const char* name_hint) {
-#if defined(DEBUG) && !V8_OS_WIN
- static int file_num = 0;
- if (FLAG_gdbjit_dump && dump_if_enabled) {
- static const int kMaxFileNameSize = 64;
- static const char* kElfFilePrefix = "/tmp/elfdump";
- static const char* kObjFileExt = ".o";
- char file_name[64];
-
- SNPrintF(Vector<char>(file_name, kMaxFileNameSize),
- "%s%s%d%s",
- kElfFilePrefix,
- (name_hint != NULL) ? name_hint : "",
- file_num++,
- kObjFileExt);
- WriteBytes(file_name, entry->symfile_addr_, entry->symfile_size_);
- }
-#endif
-
+static void RegisterCodeEntry(JITCodeEntry* entry) {
entry->next_ = __jit_debug_descriptor.first_entry_;
if (entry->next_ != NULL) entry->next_->prev_ = entry;
__jit_debug_descriptor.first_entry_ =
}
-static bool SameCodeObjects(void* key1, void* key2) {
- return key1 == key2;
-}
+struct AddressRange {
+ Address start;
+ Address end;
+};
+class JITCodeEntry;
-static HashMap* GetEntries() {
- static HashMap* entries = NULL;
- if (entries == NULL) {
- entries = new HashMap(&SameCodeObjects);
+struct SplayTreeConfig {
+ typedef AddressRange Key;
+ typedef JITCodeEntry* Value;
+ static const AddressRange kNoKey;
+ static Value NoValue() { return NULL; }
+ static int Compare(const AddressRange& a, const AddressRange& b) {
+ // ptrdiff_t probably doesn't fit in an int.
+ if (a.start < b.start) return -1;
+ if (a.start == b.start) return 0;
+ return 1;
}
- return entries;
-}
+};
+const AddressRange SplayTreeConfig::kNoKey = {0, 0};
+typedef SplayTree<SplayTreeConfig> CodeMap;
-static uint32_t HashForCodeObject(Code* code) {
- static const uintptr_t kGoldenRatio = 2654435761u;
- uintptr_t hash = reinterpret_cast<uintptr_t>(code->address());
- return static_cast<uint32_t>((hash >> kCodeAlignmentBits) * kGoldenRatio);
+static CodeMap* GetCodeMap() {
+ static CodeMap* code_map = NULL;
+ if (code_map == NULL) code_map = new CodeMap();
+ return code_map;
}
-static const intptr_t kLineInfoTag = 0x1;
-
-
-static bool IsLineInfoTagged(void* ptr) {
- return 0 != (reinterpret_cast<intptr_t>(ptr) & kLineInfoTag);
+static uint32_t HashCodeAddress(Address addr) {
+ static const intptr_t kGoldenRatio = 2654435761;
+ uintptr_t offset = OffsetFrom(addr);
+ return static_cast<uint32_t>((offset >> kCodeAlignmentBits) * kGoldenRatio);
}
-static void* TagLineInfo(LineInfo* ptr) {
- return reinterpret_cast<void*>(
- reinterpret_cast<intptr_t>(ptr) | kLineInfoTag);
+static HashMap* GetLineMap() {
+ static HashMap* line_map = NULL;
+ if (line_map == NULL) line_map = new HashMap(&HashMap::PointersMatch);
+ return line_map;
}
-static LineInfo* UntagLineInfo(void* ptr) {
- return reinterpret_cast<LineInfo*>(reinterpret_cast<intptr_t>(ptr) &
- ~kLineInfoTag);
+static void PutLineInfo(Address addr, LineInfo* info) {
+ HashMap* line_map = GetLineMap();
+ HashMap::Entry* e = line_map->Lookup(addr, HashCodeAddress(addr), true);
+ if (e->value != NULL) delete static_cast<LineInfo*>(e->value);
+ e->value = info;
}
-void GDBJITInterface::AddCode(Handle<Name> name,
- Handle<Script> script,
- Handle<Code> code,
- CompilationInfo* info) {
- if (!FLAG_gdbjit) return;
-
- Script::InitLineEnds(script);
-
- if (!name.is_null() && name->IsString()) {
- SmartArrayPointer<char> name_cstring =
- Handle<String>::cast(name)->ToCString(DISALLOW_NULLS);
- AddCode(name_cstring.get(), *code, GDBJITInterface::FUNCTION, *script,
- info);
- } else {
- AddCode("", *code, GDBJITInterface::FUNCTION, *script, info);
- }
+static LineInfo* GetLineInfo(Address addr) {
+ void* value = GetLineMap()->Remove(addr, HashCodeAddress(addr));
+ return static_cast<LineInfo*>(value);
}
static void AddUnwindInfo(CodeDescription* desc) {
#if V8_TARGET_ARCH_X64
- if (desc->tag() == GDBJITInterface::FUNCTION) {
+ if (desc->is_function()) {
// To avoid propagating unwinding information through
// compilation pipeline we use an approximation.
// For most use cases this should not affect usability.
static base::LazyMutex mutex = LAZY_MUTEX_INITIALIZER;
-void GDBJITInterface::AddCode(const char* name,
- Code* code,
- GDBJITInterface::CodeTag tag,
- Script* script,
- CompilationInfo* info) {
- base::LockGuard<base::Mutex> lock_guard(mutex.Pointer());
+// Remove entries from the splay tree that intersect the given address range,
+// and deregister them from GDB.
+static void RemoveJITCodeEntries(CodeMap* map, const AddressRange& range) {
+ DCHECK(range.start < range.end);
+ CodeMap::Locator cur;
+ if (map->FindGreatestLessThan(range, &cur) || map->FindLeast(&cur)) {
+ // Skip entries that are entirely less than the range of interest.
+ while (cur.key().end <= range.start) {
+ // CodeMap::FindLeastGreaterThan succeeds for entries whose key is greater
+ // than _or equal to_ the given key, so we have to advance our key to get
+ // the next one.
+ AddressRange new_key;
+ new_key.start = cur.key().end;
+ new_key.end = 0;
+ if (!map->FindLeastGreaterThan(new_key, &cur)) return;
+ }
+ // Evict intersecting ranges.
+ while (cur.key().start < range.end) {
+ AddressRange old_range = cur.key();
+ JITCodeEntry* old_entry = cur.value();
+
+ UnregisterCodeEntry(old_entry);
+ DestroyCodeEntry(old_entry);
+
+ CHECK(map->Remove(old_range));
+ if (!map->FindLeastGreaterThan(old_range, &cur)) return;
+ }
+ }
+}
+
+
+// Insert the entry into the splay tree and register it with GDB.
+static void AddJITCodeEntry(CodeMap* map, const AddressRange& range,
+ JITCodeEntry* entry, bool dump_if_enabled,
+ const char* name_hint) {
+#if defined(DEBUG) && !V8_OS_WIN
+ static int file_num = 0;
+ if (FLAG_gdbjit_dump && dump_if_enabled) {
+ static const int kMaxFileNameSize = 64;
+ char file_name[64];
+
+ SNPrintF(Vector<char>(file_name, kMaxFileNameSize), "/tmp/elfdump%s%d.o",
+ (name_hint != NULL) ? name_hint : "", file_num++);
+ WriteBytes(file_name, entry->symfile_addr_, entry->symfile_size_);
+ }
+#endif
+
+ CodeMap::Locator cur;
+ CHECK(map->Insert(range, &cur));
+ cur.set_value(entry);
+
+ RegisterCodeEntry(entry);
+}
+
+
+static void AddCode(const char* name, Code* code, SharedFunctionInfo* shared,
+ LineInfo* lineinfo) {
DisallowHeapAllocation no_gc;
- HashMap::Entry* e = GetEntries()->Lookup(code, HashForCodeObject(code), true);
- if (e->value != NULL && !IsLineInfoTagged(e->value)) return;
+ CodeMap* code_map = GetCodeMap();
+ AddressRange range;
+ range.start = code->address();
+ range.end = code->address() + code->CodeSize();
+ RemoveJITCodeEntries(code_map, range);
- LineInfo* lineinfo = UntagLineInfo(e->value);
- CodeDescription code_desc(name,
- code,
- script != NULL ? Handle<Script>(script)
- : Handle<Script>(),
- lineinfo,
- tag,
- info);
+ CodeDescription code_desc(name, code, shared, lineinfo);
if (!FLAG_gdbjit_full && !code_desc.IsLineInfoAvailable()) {
delete lineinfo;
- GetEntries()->Remove(code, HashForCodeObject(code));
return;
}
AddUnwindInfo(&code_desc);
Isolate* isolate = code->GetIsolate();
JITCodeEntry* entry = CreateELFObject(&code_desc, isolate);
- DCHECK(!IsLineInfoTagged(entry));
delete lineinfo;
- e->value = entry;
const char* name_hint = NULL;
bool should_dump = false;
should_dump = (name_hint != NULL);
}
}
- RegisterCodeEntry(entry, should_dump, name_hint);
+ AddJITCodeEntry(code_map, range, entry, should_dump, name_hint);
}
-void GDBJITInterface::RemoveCode(Code* code) {
+void EventHandler(const v8::JitCodeEvent* event) {
if (!FLAG_gdbjit) return;
-
- base::LockGuard<base::Mutex> lock_guard(mutex.Pointer());
- HashMap::Entry* e = GetEntries()->Lookup(code,
- HashForCodeObject(code),
- false);
- if (e == NULL) return;
-
- if (IsLineInfoTagged(e->value)) {
- delete UntagLineInfo(e->value);
- } else {
- JITCodeEntry* entry = static_cast<JITCodeEntry*>(e->value);
- UnregisterCodeEntry(entry);
- DestroyCodeEntry(entry);
- }
- e->value = NULL;
- GetEntries()->Remove(code, HashForCodeObject(code));
-}
-
-
-void GDBJITInterface::RemoveCodeRange(Address start, Address end) {
- HashMap* entries = GetEntries();
- Zone zone;
- ZoneList<Code*> dead_codes(1, &zone);
-
- for (HashMap::Entry* e = entries->Start(); e != NULL; e = entries->Next(e)) {
- Code* code = reinterpret_cast<Code*>(e->key);
- if (code->address() >= start && code->address() < end) {
- dead_codes.Add(code, &zone);
- }
- }
-
- for (int i = 0; i < dead_codes.length(); i++) {
- RemoveCode(dead_codes.at(i));
- }
-}
-
-
-static void RegisterDetailedLineInfo(Code* code, LineInfo* line_info) {
base::LockGuard<base::Mutex> lock_guard(mutex.Pointer());
- DCHECK(!IsLineInfoTagged(line_info));
- HashMap::Entry* e = GetEntries()->Lookup(code, HashForCodeObject(code), true);
- DCHECK(e->value == NULL);
- e->value = TagLineInfo(line_info);
-}
-
-
-void GDBJITInterface::EventHandler(const v8::JitCodeEvent* event) {
- if (!FLAG_gdbjit) return;
switch (event->type) {
case v8::JitCodeEvent::CODE_ADDED: {
- Code* code = Code::GetCodeFromTargetAddress(
- reinterpret_cast<Address>(event->code_start));
- if (code->kind() == Code::OPTIMIZED_FUNCTION ||
- code->kind() == Code::FUNCTION) {
- break;
- }
+ Address addr = reinterpret_cast<Address>(event->code_start);
+ Code* code = Code::GetCodeFromTargetAddress(addr);
+ LineInfo* lineinfo = GetLineInfo(addr);
EmbeddedVector<char, 256> buffer;
StringBuilder builder(buffer.start(), buffer.length());
builder.AddSubstring(event->name.str, static_cast<int>(event->name.len));
- AddCode(builder.Finalize(), code, NON_FUNCTION, NULL, NULL);
+ // It's called UnboundScript in the API but it's a SharedFunctionInfo.
+ SharedFunctionInfo* shared =
+ event->script.IsEmpty() ? NULL : *Utils::OpenHandle(*event->script);
+ AddCode(builder.Finalize(), code, shared, lineinfo);
break;
}
case v8::JitCodeEvent::CODE_MOVED:
+ // Enabling the GDB JIT interface should disable code compaction.
+ UNREACHABLE();
break;
- case v8::JitCodeEvent::CODE_REMOVED: {
- Code* code = Code::GetCodeFromTargetAddress(
- reinterpret_cast<Address>(event->code_start));
- RemoveCode(code);
+ case v8::JitCodeEvent::CODE_REMOVED:
+ // Do nothing. Instead, adding code causes eviction of any entry whose
+ // address range intersects the address range of the added code.
break;
- }
case v8::JitCodeEvent::CODE_ADD_LINE_POS_INFO: {
LineInfo* line_info = reinterpret_cast<LineInfo*>(event->user_data);
line_info->SetPosition(static_cast<intptr_t>(event->line_info.offset),
}
case v8::JitCodeEvent::CODE_END_LINE_INFO_RECORDING: {
LineInfo* line_info = reinterpret_cast<LineInfo*>(event->user_data);
- Code* code = Code::GetCodeFromTargetAddress(
- reinterpret_cast<Address>(event->code_start));
- RegisterDetailedLineInfo(code, line_info);
+ PutLineInfo(reinterpret_cast<Address>(event->code_start), line_info);
break;
}
}
}
-
-
-} } // namespace v8::internal
#endif
+} // namespace GDBJITInterface
+} // namespace internal
+} // namespace v8
projects / platform / upstream / v8.git / commitdiff