blob: dd8bc1d8b6de7bfe3b8bb74a2f4189e1fc123d9c [file] [log] [blame]
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/code_descriptors.h"
#include "platform/utils.h"
#include "vm/compiler/api/deopt_id.h"
#include "vm/flags.h"
#include "vm/log.h"
#include "vm/object.h"
#include "vm/object_store.h"
#include "vm/zone_text_buffer.h"
namespace dart {
DescriptorList::DescriptorList(
Zone* zone,
const GrowableArray<const Function*>* inline_id_to_function)
: function_(Function::Handle(
zone,
FLAG_check_token_positions && (inline_id_to_function != nullptr)
? inline_id_to_function->At(0)->ptr()
: Function::null())),
script_(Script::Handle(
zone,
function_.IsNull() ? Script::null() : function_.script())),
encoded_data_(zone, kInitialStreamSize),
prev_pc_offset(0),
prev_deopt_id(0),
prev_token_pos(0) {}
void DescriptorList::AddDescriptor(UntaggedPcDescriptors::Kind kind,
intptr_t pc_offset,
intptr_t deopt_id,
const TokenPosition token_pos,
intptr_t try_index,
intptr_t yield_index) {
// yield index 0 is reserved for normal entry.
RELEASE_ASSERT(yield_index != 0);
ASSERT((kind == UntaggedPcDescriptors::kRuntimeCall) ||
(kind == UntaggedPcDescriptors::kBSSRelocation) ||
(kind == UntaggedPcDescriptors::kOther) ||
(yield_index != UntaggedPcDescriptors::kInvalidYieldIndex) ||
(deopt_id != DeoptId::kNone));
// When precompiling, we only use pc descriptors for exceptions,
// relocations and yield indices.
if (!FLAG_precompiled_mode || try_index != -1 ||
yield_index != UntaggedPcDescriptors::kInvalidYieldIndex ||
kind == UntaggedPcDescriptors::kBSSRelocation) {
const int32_t kind_and_metadata =
UntaggedPcDescriptors::KindAndMetadata::Encode(kind, try_index,
yield_index);
encoded_data_.WriteSLEB128(kind_and_metadata);
encoded_data_.WriteSLEB128(pc_offset - prev_pc_offset);
prev_pc_offset = pc_offset;
if (!FLAG_precompiled_mode) {
if (FLAG_check_token_positions && token_pos.IsReal()) {
if (!function_.IsNull() &&
!token_pos.IsWithin(function_.token_pos(),
function_.end_token_pos())) {
FATAL("Token position %s for PC descriptor %s at offset 0x%" Px
" invalid for function %s (%s, %s)",
token_pos.ToCString(),
UntaggedPcDescriptors::KindToCString(kind), pc_offset,
function_.ToFullyQualifiedCString(),
function_.token_pos().ToCString(),
function_.end_token_pos().ToCString());
}
if (!script_.IsNull() && !script_.IsValidTokenPosition(token_pos)) {
FATAL("Token position %s for PC descriptor %s at offset 0x%" Px
" invalid for script %s of function %s",
token_pos.ToCString(),
UntaggedPcDescriptors::KindToCString(kind), pc_offset,
script_.ToCString(), function_.ToFullyQualifiedCString());
}
}
const int32_t encoded_pos = token_pos.Serialize();
encoded_data_.WriteSLEB128(deopt_id - prev_deopt_id);
encoded_data_.WriteSLEB128(
Utils::SubWithWrapAround(encoded_pos, prev_token_pos));
prev_deopt_id = deopt_id;
prev_token_pos = encoded_pos;
}
}
}
PcDescriptorsPtr DescriptorList::FinalizePcDescriptors(uword entry_point) {
if (encoded_data_.bytes_written() == 0) {
return Object::empty_descriptors().ptr();
}
return PcDescriptors::New(encoded_data_.buffer(),
encoded_data_.bytes_written());
}
void CompressedStackMapsBuilder::AddEntry(intptr_t pc_offset,
BitmapBuilder* bitmap,
intptr_t spill_slot_bit_count) {
ASSERT(bitmap != nullptr);
ASSERT(pc_offset > last_pc_offset_);
ASSERT(spill_slot_bit_count >= 0 && spill_slot_bit_count <= bitmap->Length());
const uword pc_delta = pc_offset - last_pc_offset_;
const uword non_spill_slot_bit_count =
bitmap->Length() - spill_slot_bit_count;
encoded_bytes_.WriteLEB128(pc_delta);
encoded_bytes_.WriteLEB128(spill_slot_bit_count);
encoded_bytes_.WriteLEB128(non_spill_slot_bit_count);
bitmap->AppendAsBytesTo(&encoded_bytes_);
last_pc_offset_ = pc_offset;
}
CompressedStackMapsPtr CompressedStackMapsBuilder::Finalize() const {
if (encoded_bytes_.bytes_written() == 0) {
return Object::empty_compressed_stackmaps().ptr();
}
return CompressedStackMaps::NewInlined(encoded_bytes_.buffer(),
encoded_bytes_.bytes_written());
}
ExceptionHandlersPtr ExceptionHandlerList::FinalizeExceptionHandlers(
uword entry_point) const {
intptr_t num_handlers = Length();
if (num_handlers == 0) {
return Object::empty_exception_handlers().ptr();
}
const ExceptionHandlers& handlers =
ExceptionHandlers::Handle(ExceptionHandlers::New(num_handlers));
for (intptr_t i = 0; i < num_handlers; i++) {
// Assert that every element in the array has been initialized.
if (list_[i].handler_types == NULL) {
// Unreachable handler, entry not computed.
// Initialize it to some meaningful value.
const bool has_catch_all = false;
// Check it is uninitialized.
ASSERT((list_[i].outer_try_index == -1) &&
(list_[i].pc_offset == ExceptionHandlers::kInvalidPcOffset));
handlers.SetHandlerInfo(i, list_[i].outer_try_index, list_[i].pc_offset,
list_[i].needs_stacktrace, has_catch_all,
list_[i].is_generated);
handlers.SetHandledTypes(i, Array::empty_array());
} else {
const bool has_catch_all = ContainsCatchAllType(*list_[i].handler_types);
handlers.SetHandlerInfo(i, list_[i].outer_try_index, list_[i].pc_offset,
list_[i].needs_stacktrace, has_catch_all,
list_[i].is_generated);
handlers.SetHandledTypes(i, *list_[i].handler_types);
}
}
return handlers.ptr();
}
#if !defined(DART_PRECOMPILED_RUNTIME)
class CatchEntryMovesMapBuilder::TrieNode : public ZoneAllocated {
public:
TrieNode() : move_(), entry_state_offset_(-1) {}
TrieNode(CatchEntryMove move, intptr_t index)
: move_(move), entry_state_offset_(index) {}
intptr_t Offset() { return entry_state_offset_; }
TrieNode* Insert(TrieNode* node) {
children_.Add(node);
return node;
}
TrieNode* Follow(CatchEntryMove next) {
for (intptr_t i = 0; i < children_.length(); i++) {
if (children_[i]->move_ == next) return children_[i];
}
return NULL;
}
private:
CatchEntryMove move_;
const intptr_t entry_state_offset_;
GrowableArray<TrieNode*> children_;
};
CatchEntryMovesMapBuilder::CatchEntryMovesMapBuilder()
: zone_(Thread::Current()->zone()),
root_(new TrieNode()),
current_pc_offset_(0),
stream_(zone_, 64) {}
void CatchEntryMovesMapBuilder::Append(const CatchEntryMove& move) {
moves_.Add(move);
}
void CatchEntryMovesMapBuilder::NewMapping(intptr_t pc_offset) {
moves_.Clear();
current_pc_offset_ = pc_offset;
}
void CatchEntryMovesMapBuilder::EndMapping() {
intptr_t suffix_length = 0;
TrieNode* suffix = root_;
// Find the largest common suffix, get the last node of the path.
for (intptr_t i = moves_.length() - 1; i >= 0; i--) {
TrieNode* n = suffix->Follow(moves_[i]);
if (n == NULL) break;
suffix_length++;
suffix = n;
}
intptr_t length = moves_.length() - suffix_length;
intptr_t current_offset = stream_.bytes_written();
typedef ZoneWriteStream::Raw<sizeof(intptr_t), intptr_t> Writer;
Writer::Write(&stream_, current_pc_offset_);
Writer::Write(&stream_, length);
Writer::Write(&stream_, suffix_length);
Writer::Write(&stream_, suffix->Offset());
// Write the unshared part, adding it to the trie.
TrieNode* node = suffix;
for (intptr_t i = length - 1; i >= 0; i--) {
moves_[i].WriteTo(&stream_);
TrieNode* child = new (zone_) TrieNode(moves_[i], current_offset);
node->Insert(child);
node = child;
}
}
TypedDataPtr CatchEntryMovesMapBuilder::FinalizeCatchEntryMovesMap() {
TypedData& td = TypedData::Handle(TypedData::New(
kTypedDataInt8ArrayCid, stream_.bytes_written(), Heap::kOld));
NoSafepointScope no_safepoint;
uint8_t* dest = reinterpret_cast<uint8_t*>(td.DataAddr(0));
uint8_t* src = stream_.buffer();
for (intptr_t i = 0; i < stream_.bytes_written(); i++) {
dest[i] = src[i];
}
return td.ptr();
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
uint8_t CodeSourceMapOps::Read(ReadStream* stream,
int32_t* arg1,
int32_t* arg2) {
ASSERT(stream != nullptr && arg1 != nullptr);
const int32_t n = stream->Read<int32_t>();
const uint8_t op = OpField::decode(n);
*arg1 = ArgField::decode(n);
if (*arg1 > kMaxArgValue) {
*arg1 |= kSignBits;
}
#if defined(DART_PRECOMPILER)
// The special handling for non-symbolic stack trace mode only needs to
// happen in the precompiler, because those CSMs are not serialized in
// precompiled snapshots.
if (op == kChangePosition && FLAG_dwarf_stack_traces_mode) {
const int32_t m = stream->Read<int32_t>();
if (arg2 != nullptr) {
*arg2 = m;
}
}
#endif
return op;
}
void CodeSourceMapOps::Write(BaseWriteStream* stream,
uint8_t op,
int32_t arg1,
int32_t arg2) {
ASSERT(stream != nullptr);
ASSERT(arg1 >= kMinArgValue && arg1 <= kMaxArgValue);
if (arg1 < 0) {
arg1 &= ~kSignBits;
}
const int32_t n = OpField::encode(op) | ArgField::encode(arg1);
stream->Write(n);
#if defined(DART_PRECOMPILER)
if (op == kChangePosition && FLAG_dwarf_stack_traces_mode) {
// For non-symbolic stack traces, the CodeSourceMaps are not serialized,
// so we need not worry about increasing snapshot size by including more
// information here.
stream->Write(arg2);
}
#endif
}
const TokenPosition& CodeSourceMapBuilder::kInitialPosition =
TokenPosition::kDartCodePrologue;
CodeSourceMapBuilder::CodeSourceMapBuilder(
Zone* zone,
bool stack_traces_only,
const GrowableArray<intptr_t>& caller_inline_id,
const GrowableArray<TokenPosition>& inline_id_to_token_pos,
const GrowableArray<const Function*>& inline_id_to_function)
: zone_(zone),
buffered_pc_offset_(0),
buffered_inline_id_stack_(),
buffered_token_pos_stack_(),
written_pc_offset_(0),
written_inline_id_stack_(),
written_token_pos_stack_(),
caller_inline_id_(caller_inline_id),
inline_id_to_token_pos_(inline_id_to_token_pos),
inline_id_to_function_(inline_id_to_function),
inlined_functions_(
GrowableObjectArray::Handle(GrowableObjectArray::New(Heap::kOld))),
script_(Script::Handle(zone, Script::null())),
stream_(zone, 64),
stack_traces_only_(stack_traces_only) {
buffered_inline_id_stack_.Add(0);
buffered_token_pos_stack_.Add(kInitialPosition);
written_inline_id_stack_.Add(0);
written_token_pos_stack_.Add(kInitialPosition);
}
void CodeSourceMapBuilder::FlushBuffer() {
// 1. Flush the inlining stack.
//
// The top-most position where the buffered and written stack match.
intptr_t common_index;
for (common_index = buffered_inline_id_stack_.length() - 1; common_index >= 0;
common_index--) {
intptr_t buffered_id = buffered_inline_id_stack_[common_index];
if (common_index < written_inline_id_stack_.length()) {
intptr_t written_id = written_inline_id_stack_[common_index];
if (buffered_id == written_id) {
break;
}
}
}
if (common_index < 0) {
// The base, which is the root function, should _always_ match.
UNREACHABLE();
}
while (written_inline_id_stack_.length() > common_index + 1) {
WritePop();
}
for (intptr_t j = common_index + 1; j < buffered_inline_id_stack_.length();
j++) {
const auto& buffered_pos = buffered_token_pos_stack_[j - 1];
const auto& written_pos = written_token_pos_stack_[j - 1];
if (buffered_pos != written_pos) {
WriteChangePosition(buffered_pos);
}
WritePush(buffered_inline_id_stack_[j]);
}
ASSERT_EQUAL(buffered_token_pos_stack_.length(),
written_token_pos_stack_.length());
// 2. Flush the current token position.
intptr_t top = buffered_token_pos_stack_.length() - 1;
const auto& buffered_pos = buffered_token_pos_stack_[top];
const auto& written_pos = written_token_pos_stack_[top];
if (buffered_pos != written_pos) {
WriteChangePosition(buffered_pos);
}
// 3. Flush the current PC offset.
if (buffered_pc_offset_ != written_pc_offset_) {
WriteAdvancePC(buffered_pc_offset_ - written_pc_offset_);
}
}
void CodeSourceMapBuilder::StartInliningInterval(
int32_t pc_offset,
const InstructionSource& source) {
if (!source.token_pos.IsReal() && !source.token_pos.IsSynthetic()) {
// Only record inlining intervals for token positions that might need
// to be checked against the appropriate function and/or script.
return;
}
if (buffered_inline_id_stack_.Last() == source.inlining_id) {
// No change in function stack.
return;
}
if (source.inlining_id < 0) {
// Inlining ID is unset for this source, so assume the current inlining ID.
return;
}
if (!stack_traces_only_) {
FlushBuffer();
}
// Find a minimal set of pops and pushes to bring us to the new function
// stack.
// Pop to a common ancestor.
intptr_t common_parent = source.inlining_id;
while (!IsOnBufferedStack(common_parent)) {
common_parent = caller_inline_id_[common_parent];
}
while (buffered_inline_id_stack_.Last() != common_parent) {
BufferPop();
}
// Push to the new top-of-stack function.
GrowableArray<intptr_t> to_push;
for (intptr_t id = source.inlining_id; id != common_parent;
id = caller_inline_id_[id]) {
to_push.Add(id);
}
for (intptr_t i = to_push.length() - 1; i >= 0; i--) {
intptr_t callee_id = to_push[i];
// We should never push the root function or its "caller".
ASSERT(callee_id > 0);
BufferChangePosition(inline_id_to_token_pos_[callee_id - 1]);
BufferPush(callee_id);
}
if (FLAG_check_token_positions) {
// Only update the cached script_ on inlining interval changes, since it's
// a non-trivial computation.
script_ = inline_id_to_function_[source.inlining_id]->script();
}
}
void CodeSourceMapBuilder::BeginCodeSourceRange(
int32_t pc_offset,
const InstructionSource& source) {
StartInliningInterval(pc_offset, source);
}
void CodeSourceMapBuilder::EndCodeSourceRange(int32_t pc_offset,
const InstructionSource& source) {
if (pc_offset == buffered_pc_offset_) {
return; // Empty intermediate instruction.
}
StartInliningInterval(pc_offset, source);
if (source.token_pos != buffered_token_pos_stack_.Last()) {
if (!stack_traces_only_) {
FlushBuffer();
}
BufferChangePosition(source.token_pos);
}
BufferAdvancePC(pc_offset - buffered_pc_offset_);
}
void CodeSourceMapBuilder::NoteDescriptor(UntaggedPcDescriptors::Kind kind,
int32_t pc_offset,
const InstructionSource& source) {
const uint8_t kCanThrow =
UntaggedPcDescriptors::kIcCall | UntaggedPcDescriptors::kUnoptStaticCall |
UntaggedPcDescriptors::kRuntimeCall | UntaggedPcDescriptors::kOther;
if ((kind & kCanThrow) != 0) {
StartInliningInterval(pc_offset, source);
BufferChangePosition(source.token_pos);
BufferAdvancePC(pc_offset - buffered_pc_offset_);
FlushBuffer();
}
}
void CodeSourceMapBuilder::NoteNullCheck(int32_t pc_offset,
const InstructionSource& source,
intptr_t name_index) {
StartInliningInterval(pc_offset, source);
BufferChangePosition(source.token_pos);
BufferAdvancePC(pc_offset - buffered_pc_offset_);
FlushBuffer();
WriteNullCheck(name_index);
}
intptr_t CodeSourceMapBuilder::GetFunctionId(intptr_t inline_id) {
const Function& function = *inline_id_to_function_[inline_id];
for (intptr_t i = 0; i < inlined_functions_.Length(); i++) {
if (inlined_functions_.At(i) == function.ptr()) {
return i;
}
}
RELEASE_ASSERT(!function.IsNull());
inlined_functions_.Add(function, Heap::kOld);
return inlined_functions_.Length() - 1;
}
TokenPosition CodeSourceMapBuilder::RootPosition(
const InstructionSource& source) {
if (source.inlining_id <= 0) return source.token_pos;
intptr_t id = source.inlining_id;
while (caller_inline_id_[id] != 0) {
id = caller_inline_id_[id];
}
return inline_id_to_token_pos_[id - 1];
}
ArrayPtr CodeSourceMapBuilder::InliningIdToFunction() {
if (inlined_functions_.Length() == 0) {
return Object::empty_array().ptr();
}
return Array::MakeFixedLength(inlined_functions_);
}
CodeSourceMapPtr CodeSourceMapBuilder::Finalize() {
if (!stack_traces_only_) {
FlushBuffer();
}
intptr_t length = stream_.bytes_written();
const auto& map = CodeSourceMap::Handle(zone_, CodeSourceMap::New(length));
NoSafepointScope no_safepoint;
memmove(map.Data(), stream_.buffer(), length);
return map.ptr();
}
void CodeSourceMapBuilder::BufferChangePosition(TokenPosition pos) {
if (FLAG_check_token_positions && pos.IsReal()) {
const intptr_t inline_id = buffered_inline_id_stack_.Last();
const auto& function = *inline_id_to_function_[inline_id];
if (function.end_token_pos().IsReal() &&
!pos.IsWithin(function.token_pos(), function.end_token_pos())) {
TextBuffer buffer(256);
buffer.Printf("Token position %s is invalid for function %s (%s, %s)",
pos.ToCString(), function.ToFullyQualifiedCString(),
function.token_pos().ToCString(),
function.end_token_pos().ToCString());
if (inline_id > 0) {
buffer.Printf(" while compiling function %s",
inline_id_to_function_[0]->ToFullyQualifiedCString());
}
FATAL("%s", buffer.buffer());
}
script_ = function.script();
if (!script_.IsNull() && !script_.IsValidTokenPosition(pos)) {
TextBuffer buffer(256);
buffer.Printf("Token position %s is invalid for script %s of function %s",
pos.ToCString(), script_.ToCString(),
function.ToFullyQualifiedCString());
if (inline_id != 0) {
buffer.Printf(" inlined into function %s",
inline_id_to_function_[0]->ToFullyQualifiedCString());
}
FATAL("%s", buffer.buffer());
}
}
buffered_token_pos_stack_.Last() = pos;
}
void CodeSourceMapBuilder::WriteChangePosition(const TokenPosition pos) {
const TokenPosition& last_written = written_token_pos_stack_.Last();
intptr_t position_or_line =
Utils::SubWithWrapAround(pos.Serialize(), last_written.Serialize());
intptr_t column = TokenPosition::kNoSource.Serialize();
#if defined(DART_PRECOMPILER)
if (FLAG_precompiled_mode) {
// Don't use the raw position value directly in precompiled mode. Instead,
// use the value of kNoSource as a fallback when no line or column
// information is found.
position_or_line = TokenPosition::kNoSource.Serialize();
const intptr_t inline_id = written_inline_id_stack_.Last();
ASSERT(inline_id < inline_id_to_function_.length());
script_ = inline_id_to_function_[inline_id]->script();
script_.GetTokenLocation(pos, &position_or_line, &column);
intptr_t old_line = TokenPosition::kNoSource.Serialize();
script_.GetTokenLocation(last_written, &old_line);
position_or_line =
Utils::SubWithWrapAround<int32_t>(position_or_line, old_line);
}
#endif
CodeSourceMapOps::Write(&stream_, CodeSourceMapOps::kChangePosition,
position_or_line, column);
written_token_pos_stack_.Last() = pos;
}
void CodeSourceMapReader::GetInlinedFunctionsAt(
int32_t pc_offset,
GrowableArray<const Function*>* function_stack,
GrowableArray<TokenPosition>* token_positions) {
function_stack->Clear();
token_positions->Clear();
NoSafepointScope no_safepoint;
ReadStream stream(map_.Data(), map_.Length());
int32_t current_pc_offset = 0;
function_stack->Add(&root_);
token_positions->Add(InitialPosition());
while (stream.PendingBytes() > 0) {
int32_t arg;
const uint8_t opcode = CodeSourceMapOps::Read(&stream, &arg);
switch (opcode) {
case CodeSourceMapOps::kChangePosition: {
const TokenPosition& old_token =
(*token_positions)[token_positions->length() - 1];
(*token_positions)[token_positions->length() - 1] =
TokenPosition::Deserialize(
Utils::AddWithWrapAround(arg, old_token.Serialize()));
break;
}
case CodeSourceMapOps::kAdvancePC: {
current_pc_offset += arg;
if (current_pc_offset > pc_offset) {
return;
}
break;
}
case CodeSourceMapOps::kPushFunction: {
function_stack->Add(
&Function::Handle(Function::RawCast(functions_.At(arg))));
token_positions->Add(InitialPosition());
break;
}
case CodeSourceMapOps::kPopFunction: {
// We never pop the root function.
ASSERT(function_stack->length() > 1);
ASSERT(token_positions->length() > 1);
function_stack->RemoveLast();
token_positions->RemoveLast();
break;
}
case CodeSourceMapOps::kNullCheck: {
break;
}
default:
UNREACHABLE();
}
}
}
#ifndef PRODUCT
void CodeSourceMapReader::PrintJSONInlineIntervals(JSONObject* jsobj) {
{
JSONArray inlined_functions(jsobj, "_inlinedFunctions");
Function& function = Function::Handle();
for (intptr_t i = 0; i < functions_.Length(); i++) {
function ^= functions_.At(i);
ASSERT(!function.IsNull());
inlined_functions.AddValue(function);
}
}
GrowableArray<intptr_t> function_stack;
JSONArray inline_intervals(jsobj, "_inlinedIntervals");
NoSafepointScope no_safepoint;
ReadStream stream(map_.Data(), map_.Length());
int32_t current_pc_offset = 0;
function_stack.Add(0);
while (stream.PendingBytes() > 0) {
int32_t arg;
const uint8_t opcode = CodeSourceMapOps::Read(&stream, &arg);
switch (opcode) {
case CodeSourceMapOps::kChangePosition: {
break;
}
case CodeSourceMapOps::kAdvancePC: {
// Format: [start, end, inline functions...]
JSONArray inline_interval(&inline_intervals);
inline_interval.AddValue(static_cast<intptr_t>(current_pc_offset));
inline_interval.AddValue(
static_cast<intptr_t>(current_pc_offset + arg - 1));
for (intptr_t i = 0; i < function_stack.length(); i++) {
inline_interval.AddValue(function_stack[i]);
}
current_pc_offset += arg;
break;
}
case CodeSourceMapOps::kPushFunction: {
function_stack.Add(arg);
break;
}
case CodeSourceMapOps::kPopFunction: {
// We never pop the root function.
ASSERT(function_stack.length() > 1);
function_stack.RemoveLast();
break;
}
case CodeSourceMapOps::kNullCheck: {
break;
}
default:
UNREACHABLE();
}
}
}
#endif // !PRODUCT
void CodeSourceMapReader::DumpInlineIntervals(uword start) {
GrowableArray<const Function*> function_stack;
LogBlock lb;
NoSafepointScope no_safepoint;
ReadStream stream(map_.Data(), map_.Length());
int32_t current_pc_offset = 0;
function_stack.Add(&root_);
THR_Print("Inline intervals for function '%s' {\n",
root_.ToFullyQualifiedCString());
while (stream.PendingBytes() > 0) {
int32_t arg;
const uint8_t opcode = CodeSourceMapOps::Read(&stream, &arg);
switch (opcode) {
case CodeSourceMapOps::kChangePosition: {
break;
}
case CodeSourceMapOps::kAdvancePC: {
THR_Print("%" Px "-%" Px ": ", start + current_pc_offset,
start + current_pc_offset + arg - 1);
for (intptr_t i = 0; i < function_stack.length(); i++) {
THR_Print("%s ", function_stack[i]->ToCString());
}
THR_Print("\n");
current_pc_offset += arg;
break;
}
case CodeSourceMapOps::kPushFunction: {
function_stack.Add(
&Function::Handle(Function::RawCast(functions_.At(arg))));
break;
}
case CodeSourceMapOps::kPopFunction: {
// We never pop the root function.
ASSERT(function_stack.length() > 1);
function_stack.RemoveLast();
break;
}
case CodeSourceMapOps::kNullCheck: {
break;
}
default:
UNREACHABLE();
}
}
THR_Print("}\n");
}
void CodeSourceMapReader::DumpSourcePositions(uword start) {
GrowableArray<const Function*> function_stack;
GrowableArray<TokenPosition> token_positions;
LogBlock lb;
NoSafepointScope no_safepoint;
ReadStream stream(map_.Data(), map_.Length());
int32_t current_pc_offset = 0;
function_stack.Add(&root_);
token_positions.Add(InitialPosition());
THR_Print("Source positions for function '%s' {\n",
root_.ToFullyQualifiedCString());
while (stream.PendingBytes() > 0) {
int32_t arg;
const uint8_t opcode = CodeSourceMapOps::Read(&stream, &arg);
switch (opcode) {
case CodeSourceMapOps::kChangePosition: {
const TokenPosition& old_token =
token_positions[token_positions.length() - 1];
token_positions[token_positions.length() - 1] =
TokenPosition::Deserialize(
Utils::AddWithWrapAround(arg, old_token.Serialize()));
break;
}
case CodeSourceMapOps::kAdvancePC: {
THR_Print("%" Px "-%" Px ": ", start + current_pc_offset,
start + current_pc_offset + arg - 1);
for (intptr_t i = 0; i < function_stack.length(); i++) {
THR_Print("%s@%s", function_stack[i]->ToCString(),
token_positions[i].ToCString());
}
THR_Print("\n");
current_pc_offset += arg;
break;
}
case CodeSourceMapOps::kPushFunction: {
function_stack.Add(
&Function::Handle(Function::RawCast(functions_.At(arg))));
token_positions.Add(InitialPosition());
break;
}
case CodeSourceMapOps::kPopFunction: {
// We never pop the root function.
ASSERT(function_stack.length() > 1);
ASSERT(token_positions.length() > 1);
function_stack.RemoveLast();
token_positions.RemoveLast();
break;
}
case CodeSourceMapOps::kNullCheck: {
THR_Print("%" Px "-%" Px ": null check PP#%" Pd32 "\n",
start + current_pc_offset, start + current_pc_offset, arg);
break;
}
default:
UNREACHABLE();
}
}
THR_Print("}\n");
}
intptr_t CodeSourceMapReader::GetNullCheckNameIndexAt(int32_t pc_offset) {
NoSafepointScope no_safepoint;
ReadStream stream(map_.Data(), map_.Length());
int32_t current_pc_offset = 0;
while (stream.PendingBytes() > 0) {
int32_t arg;
const uint8_t opcode = CodeSourceMapOps::Read(&stream, &arg);
switch (opcode) {
case CodeSourceMapOps::kChangePosition: {
break;
}
case CodeSourceMapOps::kAdvancePC: {
current_pc_offset += arg;
RELEASE_ASSERT(current_pc_offset <= pc_offset);
break;
}
case CodeSourceMapOps::kPushFunction: {
break;
}
case CodeSourceMapOps::kPopFunction: {
break;
}
case CodeSourceMapOps::kNullCheck: {
if (current_pc_offset == pc_offset) {
return arg;
}
break;
}
default:
UNREACHABLE();
}
}
UNREACHABLE();
return -1;
}
} // namespace dart