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[cleanup] Refactor Turbofan::Iterate and TypedFrame::Iterate

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Change-Id: I317c42a6efd977ec990e28941fd7a9e638227be0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3789517
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82028}
This commit is contained in:
Victor Gomes 2022-07-28 11:09:16 +02:00 committed by V8 LUCI CQ
parent ef1e65d9ae
commit 01f02a805c
3 changed files with 179 additions and 37 deletions
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2
src/codegen/safepoint-table.h
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@ -199,7 +199,7 @@ class SafepointTableBuilder : public SafepointTableBuilderBase {
// Note it is only valid to specify stack slots here that are *not* in
// the fixed part of the frame (e.g. argc, target, context, stored rbp,
// return address). Frame iteration handles the fixed part of the frame
// with custom code, see CommonFrame::IterateCompiledFrame.
// with custom code, see Turbofan::Iterate.
entry_->stack_indexes->Add(index, table_->zone_);
table_->UpdateMinMaxStackIndex(index);
}

193
src/execution/frames.cc
View File

@ -1131,6 +1131,20 @@ void VisitSpillSlot(Isolate* isolate, RootVisitor* v,
v->VisitRootPointer(Root::kStackRoots, nullptr, spill_slot);
}
SafepointEntry GetSafepointEntryFromCodeCache(
Isolate* isolate, Address inner_pointer,
InnerPointerToCodeCache::InnerPointerToCodeCacheEntry* entry) {
if (!entry->safepoint_entry.is_initialized()) {
entry->safepoint_entry =
entry->code.GetSafepointEntry(isolate, inner_pointer);
DCHECK(entry->safepoint_entry.is_initialized());
} else {
DCHECK_EQ(entry->safepoint_entry,
entry->code.GetSafepointEntry(isolate, inner_pointer));
}
return entry->safepoint_entry;
}
MaglevSafepointEntry GetMaglevSafepointEntryFromCodeCache(
Isolate* isolate, Address inner_pointer,
InnerPointerToCodeCache::InnerPointerToCodeCacheEntry* entry) {
@ -1147,11 +1161,33 @@ MaglevSafepointEntry GetMaglevSafepointEntryFromCodeCache(
} // namespace
void CommonFrame::IterateCompiledFrame(RootVisitor* v) const {
void TypedFrame::Iterate(RootVisitor* v) const {
// Make sure that we're not doing "safe" stack frame iteration. We cannot
// possibly find pointers in optimized frames in that state.
DCHECK(can_access_heap_objects());
// === TypedFrame ===
// +-----------------+-----------------------------------------
// | out_param n | <-- parameters_base / sp
// | ... |
// | out_param 0 |
// +-----------------+-----------------------------------------
// | spill_slot n | <-- parameters_limit ^
// | ... | spill_slot_count
// | spill_slot 0 | v
// +-----------------+-----------------------------------------
// | Type Marker | <-- frame_header_base ^
// |- - - - - - - - -| |
// | [Constant Pool] | |
// |- - - - - - - - -| kFixedSlotCount
// | saved frame ptr | <-- fp |
// |- - - - - - - - -| |
// | return addr | v
// +-----------------+-----------------------------------------
// TODO(victorgomes): Simplify this function and separate into JS
// and Wasm versions.
// Find the code and compute the safepoint information.
Address inner_pointer = pc();
SafepointEntry safepoint_entry;
@ -1202,6 +1238,8 @@ void CommonFrame::IterateCompiledFrame(RootVisitor* v) const {
has_tagged_outgoing_params = entry->code.has_tagged_outgoing_params();
#if V8_ENABLE_WEBASSEMBLY
// TODO(victorgomes): Remove this for TypedFrame, since it can only
// happens with TF frames.
// With inlined JS-to-Wasm calls, we can be in an OptimizedFrame and
// directly call a Wasm function from JavaScript. In this case the
// parameters we pass to the callee are not tagged.
@ -1344,31 +1382,39 @@ void MaglevFrame::Iterate(RootVisitor* v) const {
DCHECK(can_access_heap_objects());
// === MaglevFrame ===
// +-----------------+
// | parameter n | <-- parameters_base / sp
// +-----------------+-----------------------------------------
// | out_param n | <-- parameters_base / sp
// | ... |
// | parameter 0 |
// +-----------------+-----------------------------^
// | pushed_reg n | <-- parameters_limit |
// | ... | num_pushed_registers
// | pushed_reg 0 | <-- pushed_register_base |
// +-----------------+----------^------------------v
// | stack_slot n | |
// | ... | spill_slot_count
// | stack_slot 0 | |
// +-----------------+----------v---------------^
// | argc | <-- frame_header_base |
// | out_param 0 |
// +-----------------+-----------------------------------------
// | pushed_double n | <-- parameters_limit ^
// | ... | |
// | pushed_double 0 | |
// +- - - - - - - - -+ num_pushed_registers
// | pushed_reg n | |
// | ... | |
// | pushed_reg 0 | <-- pushed_register_base v
// +-----------------+-----------------------------------------
// | untagged_slot n | ^
// | ... | |
// | untagged_slot 0 | |
// +- - - - - - - - -+ spill_slot_count
// | tagged_slot n | |
// | ... | |
// | tagged_slot 0 | v
// +-----------------+-----------------------------------------
// | argc | <-- frame_header_base ^
// |- - - - - - - - -| |
// | JSFunction | |
// |- - - - - - - - -| frame_header_size
// | Context | |
// |- - - - - - - - -| |
// | Context | |
// |- - - - - - - - -| kFixedSlotCount
// | [Constant Pool] | |
// |- - - - - - - - -|----------^---------------v
// |- - - - - - - - -| |
// | saved frame ptr | <-- fp |
// |- - - - - - - - -| kFixedFrameSizeAboveFp
// | return addr | |
// +-----------------+----------v
// |- - - - - - - - -| |
// | return addr | v
// +-----------------+-----------------------------------------
// Find the code and compute the safepoint information.
Address inner_pointer = pc();
@ -1441,6 +1487,107 @@ void MaglevFrame::Iterate(RootVisitor* v) const {
IteratePc(v, pc_address(), constant_pool_address(), entry->code);
}
bool TurbofanFrame::HasTaggedOutgoingParams(
CodeLookupResult& code_lookup) const {
#if V8_ENABLE_WEBASSEMBLY
// With inlined JS-to-Wasm calls, we can be in an OptimizedFrame and
// directly call a Wasm function from JavaScript. In this case the
// parameters we pass to the callee are not tagged.
wasm::WasmCode* wasm_callee =
wasm::GetWasmCodeManager()->LookupCode(callee_pc());
return (wasm_callee == nullptr) && code_lookup.has_tagged_outgoing_params();
#else
return code_lookup.has_tagged_outgoing_params();
#endif // V8_ENABLE_WEBASSEMBLY
}
void TurbofanFrame::Iterate(RootVisitor* v) const {
// Make sure that we're not doing "safe" stack frame iteration. We cannot
// possibly find pointers in optimized frames in that state.
DCHECK(can_access_heap_objects());
// === TurbofanFrame ===
// +-----------------+-----------------------------------------
// | out_param n | <-- parameters_base / sp
// | ... |
// | out_param 0 |
// +-----------------+-----------------------------------------
// | spill_slot n | <-- parameters_limit ^
// | ... | spill_slot_count
// | spill_slot 0 | v
// +-----------------+-----------------------------------------
// | argc | <-- frame_header_base ^
// |- - - - - - - - -| |
// | JSFunction | |
// |- - - - - - - - -| |
// | Context | |
// |- - - - - - - - -| kFixedSlotCount
// | [Constant Pool] | |
// |- - - - - - - - -| |
// | saved frame ptr | <-- fp |
// |- - - - - - - - -| |
// | return addr | v
// +-----------------+-----------------------------------------
// Find the code and compute the safepoint information.
Address inner_pointer = pc();
InnerPointerToCodeCache::InnerPointerToCodeCacheEntry* entry =
isolate()->inner_pointer_to_code_cache()->GetCacheEntry(inner_pointer);
CHECK(entry->code.IsFound());
DCHECK(entry->code.is_turbofanned());
SafepointEntry safepoint_entry =
GetSafepointEntryFromCodeCache(isolate(), inner_pointer, entry);
#ifdef DEBUG
// Assert that it is a JS frame and it has a context.
intptr_t marker =
Memory<intptr_t>(fp() + CommonFrameConstants::kContextOrFrameTypeOffset);
DCHECK(!StackFrame::IsTypeMarker(marker));
#endif // DEBUG
// Determine the fixed header and spill slot area size.
int frame_header_size = StandardFrameConstants::kFixedFrameSizeFromFp;
int spill_slot_count =
entry->code.stack_slots() - StandardFrameConstants::kFixedSlotCount;
// Fixed frame slots.
FullObjectSlot frame_header_base(&Memory<Address>(fp() - frame_header_size));
FullObjectSlot frame_header_limit(
&Memory<Address>(fp() - StandardFrameConstants::kCPSlotSize));
// Parameters passed to the callee.
FullObjectSlot parameters_base(&Memory<Address>(sp()));
FullObjectSlot parameters_limit = frame_header_base - spill_slot_count;
// Visit the outgoing parameters if they are tagged.
if (HasTaggedOutgoingParams(entry->code)) {
v->VisitRootPointers(Root::kStackRoots, nullptr, parameters_base,
parameters_limit);
}
// Spill slots are in the region ]frame_header_base, parameters_limit];
// Visit pointer spill slots and locals.
DCHECK_GE((entry->code.stack_slots() + kBitsPerByte) / kBitsPerByte,
safepoint_entry.tagged_slots().size());
int slot_offset = 0;
for (uint8_t bits : safepoint_entry.tagged_slots()) {
while (bits) {
const int bit = base::bits::CountTrailingZeros(bits);
bits &= ~(1 << bit);
FullObjectSlot spill_slot = parameters_limit + slot_offset + bit;
VisitSpillSlot(isolate(), v, spill_slot);
}
slot_offset += kBitsPerByte;
}
// Visit fixed header region (the context and JSFunction), skipping the
// argument count since it is stored untagged.
v->VisitRootPointers(Root::kStackRoots, nullptr, frame_header_base + 1,
frame_header_limit);
// Visit the return address in the callee and incoming arguments.
IteratePc(v, pc_address(), constant_pool_address(), entry->code);
}
Code StubFrame::unchecked_code() const {
return isolate()->FindCodeObject(pc()).code();
}
@ -1454,8 +1601,6 @@ int StubFrame::LookupExceptionHandlerInTable() {
return table.LookupReturn(pc_offset);
}
void OptimizedFrame::Iterate(RootVisitor* v) const { IterateCompiledFrame(v); }
void JavaScriptFrame::SetParameterValue(int index, Object value) const {
Memory<Address>(GetParameterSlot(index)) = value.ptr();
}
@ -2387,8 +2532,8 @@ void JsToWasmFrame::Iterate(RootVisitor* v) const {
// |- - - - - - - - -| |
if (builtin != Builtin::kGenericJSToWasmWrapper) {
// If it's not the GenericJSToWasmWrapper, then it's the TurboFan compiled
// specific wrapper. So we have to call IterateCompiledFrame.
IterateCompiledFrame(v);
// specific wrapper. So we have to call TypedFrame::Iterate.
TypedFrame::Iterate(v);
return;
}
// The [fp + BuiltinFrameConstants::kGCScanSlotCount] on the stack is a value

11
src/execution/frames.h
View File

@ -537,9 +537,6 @@ class CommonFrame : public StackFrame {
// Returns the address of the n'th expression stack element.
virtual Address GetExpressionAddress(int n) const;
// Used by OptimizedFrames and StubFrames.
void IterateCompiledFrame(RootVisitor* v) const;
private:
friend class StackFrame;
friend class SafeStackFrameIterator;
@ -548,7 +545,7 @@ class CommonFrame : public StackFrame {
class TypedFrame : public CommonFrame {
public:
Code unchecked_code() const override { return {}; }
void Iterate(RootVisitor* v) const override { IterateCompiledFrame(v); }
void Iterate(RootVisitor* v) const override;
protected:
inline explicit TypedFrame(StackFrameIteratorBase* iterator);
@ -818,9 +815,6 @@ class StubFrame : public TypedFrame {
class OptimizedFrame : public JavaScriptFrame {
public:
// GC support.
void Iterate(RootVisitor* v) const override;
// Return a list with {SharedFunctionInfo} objects of this frame.
// The functions are ordered bottom-to-top (i.e. functions.last()
// is the top-most activation)
@ -957,6 +951,9 @@ class TurbofanFrame : public OptimizedFrame {
int* data, HandlerTable::CatchPrediction* prediction) override;
int ComputeParametersCount() const override;
bool HasTaggedOutgoingParams(CodeLookupResult& code_lookup) const;
void Iterate(RootVisitor* v) const override;
protected:
inline explicit TurbofanFrame(StackFrameIteratorBase* iterator);