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builtins-arm64.cc
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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#if V8_TARGET_ARCH_ARM64
#include "src/api/api-arguments.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/interface-descriptors-inl.h"
// For interpreter_entry_return_pc_offset. TODO(jkummerow): Drop.
#include "src/codegen/macro-assembler-inl.h"
#include "src/codegen/register-configuration.h"
#include "src/debug/debug.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames.h"
#include "src/heap/heap-inl.h"
#include "src/logging/counters.h"
#include "src/objects/cell.h"
#include "src/objects/foreign.h"
#include "src/objects/heap-number.h"
#include "src/objects/instance-type.h"
#include "src/objects/js-generator.h"
#include "src/objects/objects-inl.h"
#include "src/objects/smi.h"
#include "src/runtime/runtime.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/wasm/wasm-linkage.h"
#include "src/wasm/wasm-objects.h"
#endif // V8_ENABLE_WEBASSEMBLY
#if defined(V8_OS_WIN)
#include "src/diagnostics/unwinding-info-win64.h"
#endif // V8_OS_WIN
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm, Address address) {
__ CodeEntry();
__ Mov(kJavaScriptCallExtraArg1Register, ExternalReference::Create(address));
__ Jump(BUILTIN_CODE(masm->isolate(), AdaptorWithBuiltinExitFrame),
RelocInfo::CODE_TARGET);
}
static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
Runtime::FunctionId function_id) {
ASM_CODE_COMMENT(masm);
// ----------- S t a t e -------------
// -- x0 : actual argument count
// -- x1 : target function (preserved for callee)
// -- x3 : new target (preserved for callee)
// -----------------------------------
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Push a copy of the target function, the new target and the actual
// argument count.
__ SmiTag(kJavaScriptCallArgCountRegister);
__ Push(kJavaScriptCallTargetRegister, kJavaScriptCallNewTargetRegister,
kJavaScriptCallArgCountRegister, padreg);
// Push another copy as a parameter to the runtime call.
__ PushArgument(kJavaScriptCallTargetRegister);
__ CallRuntime(function_id, 1);
__ Mov(x2, x0);
// Restore target function, new target and actual argument count.
__ Pop(padreg, kJavaScriptCallArgCountRegister,
kJavaScriptCallNewTargetRegister, kJavaScriptCallTargetRegister);
__ SmiUntag(kJavaScriptCallArgCountRegister);
}
static_assert(kJavaScriptCallCodeStartRegister == x2, "ABI mismatch");
__ JumpCodeObject(x2);
}
namespace {
void Generate_JSBuiltinsConstructStubHelper(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : number of arguments
// -- x1 : constructor function
// -- x3 : new target
// -- cp : context
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
ASM_LOCATION("Builtins::Generate_JSConstructStubHelper");
Label stack_overflow;
__ StackOverflowCheck(x0, &stack_overflow);
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
Label already_aligned;
Register argc = x0;
if (FLAG_debug_code) {
// Check that FrameScope pushed the context on to the stack already.
__ Peek(x2, 0);
__ Cmp(x2, cp);
__ Check(eq, AbortReason::kUnexpectedValue);
}
// Push number of arguments.
__ SmiTag(x11, argc);
__ Push(x11, padreg);
// Add a slot for the receiver, and round up to maintain alignment.
Register slot_count = x2;
Register slot_count_without_rounding = x12;
__ Add(slot_count_without_rounding, argc, 2);
__ Bic(slot_count, slot_count_without_rounding, 1);
__ Claim(slot_count);
// Preserve the incoming parameters on the stack.
__ LoadRoot(x4, RootIndex::kTheHoleValue);
// Compute a pointer to the slot immediately above the location on the
// stack to which arguments will be later copied.
__ SlotAddress(x2, argc);
// Store padding, if needed.
__ Tbnz(slot_count_without_rounding, 0, &already_aligned);
__ Str(padreg, MemOperand(x2, 1 * kSystemPointerSize));
__ Bind(&already_aligned);
// TODO(victorgomes): When the arguments adaptor is completely removed, we
// should get the formal parameter count and copy the arguments in its
// correct position (including any undefined), instead of delaying this to
// InvokeFunction.
// Copy arguments to the expression stack.
{
Register count = x2;
Register dst = x10;
Register src = x11;
__ SlotAddress(dst, 0);
// Poke the hole (receiver).
__ Str(x4, MemOperand(dst));
__ Add(dst, dst, kSystemPointerSize); // Skip receiver.
__ Add(src, fp,
StandardFrameConstants::kCallerSPOffset +
kSystemPointerSize); // Skip receiver.
__ Mov(count, argc);
__ CopyDoubleWords(dst, src, count);
}
// ----------- S t a t e -------------
// -- x0: number of arguments (untagged)
// -- x1: constructor function
// -- x3: new target
// If argc is odd:
// -- sp[0*kSystemPointerSize]: the hole (receiver)
// -- sp[1*kSystemPointerSize]: argument 1
// -- ...
// -- sp[(n-1)*kSystemPointerSize]: argument (n - 1)
// -- sp[(n+0)*kSystemPointerSize]: argument n
// -- sp[(n+1)*kSystemPointerSize]: padding
// -- sp[(n+2)*kSystemPointerSize]: padding
// -- sp[(n+3)*kSystemPointerSize]: number of arguments (tagged)
// -- sp[(n+4)*kSystemPointerSize]: context (pushed by FrameScope)
// If argc is even:
// -- sp[0*kSystemPointerSize]: the hole (receiver)
// -- sp[1*kSystemPointerSize]: argument 1
// -- ...
// -- sp[(n-1)*kSystemPointerSize]: argument (n - 1)
// -- sp[(n+0)*kSystemPointerSize]: argument n
// -- sp[(n+1)*kSystemPointerSize]: padding
// -- sp[(n+2)*kSystemPointerSize]: number of arguments (tagged)
// -- sp[(n+3)*kSystemPointerSize]: context (pushed by FrameScope)
// -----------------------------------
// Call the function.
__ InvokeFunctionWithNewTarget(x1, x3, argc, InvokeType::kCall);
// Restore the context from the frame.
__ Ldr(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// Restore smi-tagged arguments count from the frame. Use fp relative
// addressing to avoid the circular dependency between padding existence and
// argc parity.
__ SmiUntag(x1, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
__ DropArguments(x1, TurboAssembler::kCountExcludesReceiver);
__ Ret();
__ Bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ Unreachable();
}
}
} // namespace
// The construct stub for ES5 constructor functions and ES6 class constructors.
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : number of arguments
// -- x1 : constructor function
// -- x3 : new target
// -- lr : return address
// -- cp : context pointer
// -- sp[...]: constructor arguments
// -----------------------------------
ASM_LOCATION("Builtins::Generate_JSConstructStubGeneric");
FrameScope scope(masm, StackFrame::MANUAL);
// Enter a construct frame.
__ EnterFrame(StackFrame::CONSTRUCT);
Label post_instantiation_deopt_entry, not_create_implicit_receiver;
if (FLAG_debug_code) {
// Check that FrameScope pushed the context on to the stack already.
__ Peek(x2, 0);
__ Cmp(x2, cp);
__ Check(eq, AbortReason::kUnexpectedValue);
}
// Preserve the incoming parameters on the stack.
__ SmiTag(x0);
__ Push(x0, x1, padreg, x3);
// ----------- S t a t e -------------
// -- sp[0*kSystemPointerSize]: new target
// -- sp[1*kSystemPointerSize]: padding
// -- x1 and sp[2*kSystemPointerSize]: constructor function
// -- sp[3*kSystemPointerSize]: number of arguments (tagged)
// -- sp[4*kSystemPointerSize]: context (pushed by FrameScope)
// -----------------------------------
__ LoadTaggedPointerField(
x4, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
__ Ldr(w4, FieldMemOperand(x4, SharedFunctionInfo::kFlagsOffset));
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(w4);
__ JumpIfIsInRange(w4, kDefaultDerivedConstructor, kDerivedConstructor,
¬_create_implicit_receiver);
// If not derived class constructor: Allocate the new receiver object.
__ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1, x4,
x5);
__ Call(BUILTIN_CODE(masm->isolate(), FastNewObject), RelocInfo::CODE_TARGET);
__ B(&post_instantiation_deopt_entry);
// Else: use TheHoleValue as receiver for constructor call
__ Bind(¬_create_implicit_receiver);
__ LoadRoot(x0, RootIndex::kTheHoleValue);
// ----------- S t a t e -------------
// -- x0: receiver
// -- Slot 4 / sp[0*kSystemPointerSize]: new target
// -- Slot 3 / sp[1*kSystemPointerSize]: padding
// -- Slot 2 / sp[2*kSystemPointerSize]: constructor function
// -- Slot 1 / sp[3*kSystemPointerSize]: number of arguments (tagged)
// -- Slot 0 / sp[4*kSystemPointerSize]: context
// -----------------------------------
// Deoptimizer enters here.
masm->isolate()->heap()->SetConstructStubCreateDeoptPCOffset(
masm->pc_offset());
__ Bind(&post_instantiation_deopt_entry);
// Restore new target from the top of the stack.
__ Peek(x3, 0 * kSystemPointerSize);
// Restore constructor function and argument count.
__ Ldr(x1, MemOperand(fp, ConstructFrameConstants::kConstructorOffset));
__ SmiUntag(x12, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Copy arguments to the expression stack. The called function pops the
// receiver along with its arguments, so we need an extra receiver on the
// stack, in case we have to return it later.
// Overwrite the new target with a receiver.
__ Poke(x0, 0);
// Push two further copies of the receiver. One will be popped by the called
// function. The second acts as padding if the number of arguments plus
// receiver is odd - pushing receiver twice avoids branching. It also means
// that we don't have to handle the even and odd cases specially on
// InvokeFunction's return, as top of stack will be the receiver in either
// case.
__ Push(x0, x0);
// ----------- S t a t e -------------
// -- x3: new target
// -- x12: number of arguments (untagged)
// -- sp[0*kSystemPointerSize]: implicit receiver (overwrite if argc
// odd)
// -- sp[1*kSystemPointerSize]: implicit receiver
// -- sp[2*kSystemPointerSize]: implicit receiver
// -- sp[3*kSystemPointerSize]: padding
// -- x1 and sp[4*kSystemPointerSize]: constructor function
// -- sp[5*kSystemPointerSize]: number of arguments (tagged)
// -- sp[6*kSystemPointerSize]: context
// -----------------------------------
// Round the number of arguments down to the next even number, and claim
// slots for the arguments. If the number of arguments was odd, the last
// argument will overwrite one of the receivers pushed above.
__ Bic(x10, x12, 1);
// Check if we have enough stack space to push all arguments.
Label stack_overflow;
__ StackOverflowCheck(x10, &stack_overflow);
__ Claim(x10);
// TODO(victorgomes): When the arguments adaptor is completely removed, we
// should get the formal parameter count and copy the arguments in its
// correct position (including any undefined), instead of delaying this to
// InvokeFunction.
// Copy the arguments.
{
Register count = x2;
Register dst = x10;
Register src = x11;
__ Mov(count, x12);
__ Poke(x0, 0); // Add the receiver.
__ SlotAddress(dst, 1); // Skip receiver.
__ Add(src, fp,
StandardFrameConstants::kCallerSPOffset + kSystemPointerSize);
__ CopyDoubleWords(dst, src, count);
}
// Call the function.
__ Mov(x0, x12);
__ InvokeFunctionWithNewTarget(x1, x3, x0, InvokeType::kCall);
// ----------- S t a t e -------------
// -- sp[0*kSystemPointerSize]: implicit receiver
// -- sp[1*kSystemPointerSize]: padding
// -- sp[2*kSystemPointerSize]: constructor function
// -- sp[3*kSystemPointerSize]: number of arguments
// -- sp[4*kSystemPointerSize]: context
// -----------------------------------
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetConstructStubInvokeDeoptPCOffset(
masm->pc_offset());
// If the result is an object (in the ECMA sense), we should get rid
// of the receiver and use the result; see ECMA-262 section 13.2.2-7
// on page 74.
Label use_receiver, do_throw, leave_and_return, check_receiver;
// If the result is undefined, we jump out to using the implicit receiver.
__ CompareRoot(x0, RootIndex::kUndefinedValue);
__ B(ne, &check_receiver);
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ Bind(&use_receiver);
__ Peek(x0, 0 * kSystemPointerSize);
__ CompareRoot(x0, RootIndex::kTheHoleValue);
__ B(eq, &do_throw);
__ Bind(&leave_and_return);
// Restore smi-tagged arguments count from the frame.
__ SmiUntag(x1, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
__ LeaveFrame(StackFrame::CONSTRUCT);
// Remove caller arguments from the stack and return.
__ DropArguments(x1, TurboAssembler::kCountExcludesReceiver);
__ Ret();
// Otherwise we do a smi check and fall through to check if the return value
// is a valid receiver.
__ bind(&check_receiver);
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(x0, &use_receiver);
// If the type of the result (stored in its map) is less than
// FIRST_JS_RECEIVER_TYPE, it is not an object in the ECMA sense.
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ JumpIfObjectType(x0, x4, x5, FIRST_JS_RECEIVER_TYPE, &leave_and_return,
ge);
__ B(&use_receiver);
__ Bind(&do_throw);
// Restore the context from the frame.
__ Ldr(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
__ Unreachable();
__ Bind(&stack_overflow);
// Restore the context from the frame.
__ Ldr(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowStackOverflow);
__ Unreachable();
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSBuiltinsConstructStubHelper(masm);
}
void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
FrameScope scope(masm, StackFrame::INTERNAL);
__ PushArgument(x1);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable);
__ Unreachable();
}
// TODO(v8:11429): Add a path for "not_compiled" and unify the two uses under
// the more general dispatch.
static void GetSharedFunctionInfoBytecodeOrBaseline(MacroAssembler* masm,
Register sfi_data,
Register scratch1,
Label* is_baseline) {
ASM_CODE_COMMENT(masm);
Label done;
__ CompareObjectType(sfi_data, scratch1, scratch1, BASELINE_DATA_TYPE);
__ B(eq, is_baseline);
__ Cmp(scratch1, INTERPRETER_DATA_TYPE);
__ B(ne, &done);
__ LoadTaggedPointerField(
sfi_data,
FieldMemOperand(sfi_data, InterpreterData::kBytecodeArrayOffset));
__ Bind(&done);
}
// static
void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : the value to pass to the generator
// -- x1 : the JSGeneratorObject to resume
// -- lr : return address
// -----------------------------------
// Store input value into generator object.
__ StoreTaggedField(
x0, FieldMemOperand(x1, JSGeneratorObject::kInputOrDebugPosOffset));
__ RecordWriteField(x1, JSGeneratorObject::kInputOrDebugPosOffset, x0,
kLRHasNotBeenSaved, SaveFPRegsMode::kIgnore);
// Check that x1 is still valid, RecordWrite might have clobbered it.
__ AssertGeneratorObject(x1);
// Load suspended function and context.
__ LoadTaggedPointerField(
x4, FieldMemOperand(x1, JSGeneratorObject::kFunctionOffset));
__ LoadTaggedPointerField(cp,
FieldMemOperand(x4, JSFunction::kContextOffset));
// Flood function if we are stepping.
Label prepare_step_in_if_stepping, prepare_step_in_suspended_generator;
Label stepping_prepared;
ExternalReference debug_hook =
ExternalReference::debug_hook_on_function_call_address(masm->isolate());
__ Mov(x10, debug_hook);
__ Ldrsb(x10, MemOperand(x10));
__ CompareAndBranch(x10, Operand(0), ne, &prepare_step_in_if_stepping);
// Flood function if we need to continue stepping in the suspended generator.
ExternalReference debug_suspended_generator =
ExternalReference::debug_suspended_generator_address(masm->isolate());
__ Mov(x10, debug_suspended_generator);
__ Ldr(x10, MemOperand(x10));
__ CompareAndBranch(x10, Operand(x1), eq,
&prepare_step_in_suspended_generator);
__ Bind(&stepping_prepared);
// Check the stack for overflow. We are not trying to catch interruptions
// (i.e. debug break and preemption) here, so check the "real stack limit".
Label stack_overflow;
__ LoadStackLimit(x10, StackLimitKind::kRealStackLimit);
__ Cmp(sp, x10);
__ B(lo, &stack_overflow);
// Get number of arguments for generator function.
__ LoadTaggedPointerField(
x10, FieldMemOperand(x4, JSFunction::kSharedFunctionInfoOffset));
__ Ldrh(w10, FieldMemOperand(
x10, SharedFunctionInfo::kFormalParameterCountOffset));
// Claim slots for arguments and receiver (rounded up to a multiple of two).
__ Add(x11, x10, 2);
__ Bic(x11, x11, 1);
__ Claim(x11);
// Store padding (which might be replaced by the receiver).
__ Sub(x11, x11, 1);
__ Poke(padreg, Operand(x11, LSL, kSystemPointerSizeLog2));
// Poke receiver into highest claimed slot.
__ LoadTaggedPointerField(
x5, FieldMemOperand(x1, JSGeneratorObject::kReceiverOffset));
__ Poke(x5, __ ReceiverOperand(x10));
// ----------- S t a t e -------------
// -- x1 : the JSGeneratorObject to resume
// -- x4 : generator function
// -- x10 : argument count
// -- cp : generator context
// -- lr : return address
// -- sp[0 .. arg count] : claimed for receiver and args
// -----------------------------------
// Copy the function arguments from the generator object's register file.
__ LoadTaggedPointerField(
x5,
FieldMemOperand(x1, JSGeneratorObject::kParametersAndRegistersOffset));
{
Label loop, done;
__ Cbz(x10, &done);
__ SlotAddress(x12, x10);
__ Add(x5, x5, Operand(x10, LSL, kTaggedSizeLog2));
__ Add(x5, x5, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ Bind(&loop);
__ Sub(x10, x10, 1);
__ LoadAnyTaggedField(x11, MemOperand(x5, -kTaggedSize, PreIndex));
__ Str(x11, MemOperand(x12, -kSystemPointerSize, PostIndex));
__ Cbnz(x10, &loop);
__ Bind(&done);
}
// Underlying function needs to have bytecode available.
if (FLAG_debug_code) {
Label is_baseline;
__ LoadTaggedPointerField(
x3, FieldMemOperand(x4, JSFunction::kSharedFunctionInfoOffset));
__ LoadTaggedPointerField(
x3, FieldMemOperand(x3, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecodeOrBaseline(masm, x3, x0, &is_baseline);
__ CompareObjectType(x3, x3, x3, BYTECODE_ARRAY_TYPE);
__ Assert(eq, AbortReason::kMissingBytecodeArray);
__ bind(&is_baseline);
}
// Resume (Ignition/TurboFan) generator object.
{
__ LoadTaggedPointerField(
x0, FieldMemOperand(x4, JSFunction::kSharedFunctionInfoOffset));
__ Ldrh(w0, FieldMemOperand(
x0, SharedFunctionInfo::kFormalParameterCountOffset));
// We abuse new.target both to indicate that this is a resume call and to
// pass in the generator object. In ordinary calls, new.target is always
// undefined because generator functions are non-constructable.
__ Mov(x3, x1);
__ Mov(x1, x4);
static_assert(kJavaScriptCallCodeStartRegister == x2, "ABI mismatch");
__ LoadTaggedPointerField(x2, FieldMemOperand(x1, JSFunction::kCodeOffset));
__ JumpCodeTObject(x2);
}
__ Bind(&prepare_step_in_if_stepping);
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Push hole as receiver since we do not use it for stepping.
__ LoadRoot(x5, RootIndex::kTheHoleValue);
__ Push(x1, padreg, x4, x5);
__ CallRuntime(Runtime::kDebugOnFunctionCall);
__ Pop(padreg, x1);
__ LoadTaggedPointerField(
x4, FieldMemOperand(x1, JSGeneratorObject::kFunctionOffset));
}
__ B(&stepping_prepared);
__ Bind(&prepare_step_in_suspended_generator);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(x1, padreg);
__ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
__ Pop(padreg, x1);
__ LoadTaggedPointerField(
x4, FieldMemOperand(x1, JSGeneratorObject::kFunctionOffset));
}
__ B(&stepping_prepared);
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ Unreachable(); // This should be unreachable.
}
}
namespace {
// Called with the native C calling convention. The corresponding function
// signature is either:
//
// using JSEntryFunction = GeneratedCode<Address(
// Address root_register_value, Address new_target, Address target,
// Address receiver, intptr_t argc, Address** argv)>;
// or
// using JSEntryFunction = GeneratedCode<Address(
// Address root_register_value, MicrotaskQueue* microtask_queue)>;
//
// Input is either:
// x0: root_register_value.
// x1: new_target.
// x2: target.
// x3: receiver.
// x4: argc.
// x5: argv.
// or
// x0: root_register_value.
// x1: microtask_queue.
// Output:
// x0: result.
void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
Builtin entry_trampoline) {
Label invoke, handler_entry, exit;
{
NoRootArrayScope no_root_array(masm);
#if defined(V8_OS_WIN)
// In order to allow Windows debugging tools to reconstruct a call stack, we
// must generate information describing how to recover at least fp, sp, and
// pc for the calling frame. Here, JSEntry registers offsets to
// xdata_encoder which then emits the offset values as part of the unwind
// data accordingly.
win64_unwindinfo::XdataEncoder* xdata_encoder = masm->GetXdataEncoder();
if (xdata_encoder) {
xdata_encoder->onFramePointerAdjustment(
EntryFrameConstants::kDirectCallerFPOffset,
EntryFrameConstants::kDirectCallerSPOffset);
}
#endif
__ PushCalleeSavedRegisters();
// Set up the reserved register for 0.0.
__ Fmov(fp_zero, 0.0);
// Initialize the root register.
// C calling convention. The first argument is passed in x0.
__ Mov(kRootRegister, x0);
#ifdef V8_COMPRESS_POINTERS_IN_SHARED_CAGE
// Initialize the pointer cage base register.
__ LoadRootRelative(kPtrComprCageBaseRegister,
IsolateData::cage_base_offset());
#endif
}
// Set up fp. It points to the {fp, lr} pair pushed as the last step in
// PushCalleeSavedRegisters.
STATIC_ASSERT(
EntryFrameConstants::kCalleeSavedRegisterBytesPushedAfterFpLrPair == 0);
STATIC_ASSERT(EntryFrameConstants::kOffsetToCalleeSavedRegisters == 0);
__ Mov(fp, sp);
// Build an entry frame (see layout below).
// Push frame type markers.
__ Mov(x12, StackFrame::TypeToMarker(type));
__ Push(x12, xzr);
__ Mov(x11, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ Ldr(x10, MemOperand(x11)); // x10 = C entry FP.
// Clear c_entry_fp, now we've loaded its value to be pushed on the stack.
// If the c_entry_fp is not already zero and we don't clear it, the
// SafeStackFrameIterator will assume we are executing C++ and miss the JS
// frames on top.
__ Str(xzr, MemOperand(x11));
// Set js_entry_sp if this is the outermost JS call.
Label done;
ExternalReference js_entry_sp = ExternalReference::Create(
IsolateAddressId::kJSEntrySPAddress, masm->isolate());
__ Mov(x12, js_entry_sp);
__ Ldr(x11, MemOperand(x12)); // x11 = previous JS entry SP.
// Select between the inner and outermost frame marker, based on the JS entry
// sp. We assert that the inner marker is zero, so we can use xzr to save a
// move instruction.
DCHECK_EQ(StackFrame::INNER_JSENTRY_FRAME, 0);
__ Cmp(x11, 0); // If x11 is zero, this is the outermost frame.
// x11 = JS entry frame marker.
__ Csel(x11, xzr, StackFrame::OUTERMOST_JSENTRY_FRAME, ne);
__ B(ne, &done);
__ Str(fp, MemOperand(x12));
__ Bind(&done);
__ Push(x10, x11);
// The frame set up looks like this:
// sp[0] : JS entry frame marker.
// sp[1] : C entry FP.
// sp[2] : stack frame marker (0).
// sp[3] : stack frame marker (type).
// sp[4] : saved fp <- fp points here.
// sp[5] : saved lr
// sp[6,24) : other saved registers
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ B(&invoke);
// Prevent the constant pool from being emitted between the record of the
// handler_entry position and the first instruction of the sequence here.
// There is no risk because Assembler::Emit() emits the instruction before
// checking for constant pool emission, but we do not want to depend on
// that.
{
Assembler::BlockPoolsScope block_pools(masm);
// Store the current pc as the handler offset. It's used later to create the
// handler table.
__ BindExceptionHandler(&handler_entry);
masm->isolate()->builtins()->SetJSEntryHandlerOffset(handler_entry.pos());
// Caught exception: Store result (exception) in the pending exception
// field in the JSEnv and return a failure sentinel. Coming in here the
// fp will be invalid because UnwindAndFindHandler sets it to 0 to
// signal the existence of the JSEntry frame.
__ Mov(x10,
ExternalReference::Create(IsolateAddressId::kPendingExceptionAddress,
masm->isolate()));
}
__ Str(x0, MemOperand(x10));
__ LoadRoot(x0, RootIndex::kException);
__ B(&exit);
// Invoke: Link this frame into the handler chain.
__ Bind(&invoke);
// Push new stack handler.
static_assert(StackHandlerConstants::kSize == 2 * kSystemPointerSize,
"Unexpected offset for StackHandlerConstants::kSize");
static_assert(StackHandlerConstants::kNextOffset == 0 * kSystemPointerSize,
"Unexpected offset for StackHandlerConstants::kNextOffset");
// Link the current handler as the next handler.
__ Mov(x11, ExternalReference::Create(IsolateAddressId::kHandlerAddress,
masm->isolate()));
__ Ldr(x10, MemOperand(x11));
__ Push(padreg, x10);
// Set this new handler as the current one.
{
UseScratchRegisterScope temps(masm);
Register scratch = temps.AcquireX();
__ Mov(scratch, sp);
__ Str(scratch, MemOperand(x11));
}
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the B(&invoke) above, which
// restores all callee-saved registers (including cp and fp) to their
// saved values before returning a failure to C.
//
// Invoke the function by calling through JS entry trampoline builtin and
// pop the faked function when we return.
Handle<Code> trampoline_code =
masm->isolate()->builtins()->code_handle(entry_trampoline);
__ Call(trampoline_code, RelocInfo::CODE_TARGET);
// Pop the stack handler and unlink this frame from the handler chain.
static_assert(StackHandlerConstants::kNextOffset == 0 * kSystemPointerSize,
"Unexpected offset for StackHandlerConstants::kNextOffset");
__ Pop(x10, padreg);
__ Mov(x11, ExternalReference::Create(IsolateAddressId::kHandlerAddress,
masm->isolate()));
__ Drop(StackHandlerConstants::kSlotCount - 2);
__ Str(x10, MemOperand(x11));
__ Bind(&exit);
// x0 holds the result.
// The stack pointer points to the top of the entry frame pushed on entry from
// C++ (at the beginning of this stub):
// sp[0] : JS entry frame marker.
// sp[1] : C entry FP.
// sp[2] : stack frame marker (0).
// sp[3] : stack frame marker (type).
// sp[4] : saved fp <- fp might point here, or might be zero.
// sp[5] : saved lr
// sp[6,24) : other saved registers
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
{
Register c_entry_fp = x11;
__ PeekPair(x10, c_entry_fp, 0);
__ Cmp(x10, StackFrame::OUTERMOST_JSENTRY_FRAME);
__ B(ne, &non_outermost_js_2);
__ Mov(x12, js_entry_sp);
__ Str(xzr, MemOperand(x12));
__ Bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ Mov(x12, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ Str(c_entry_fp, MemOperand(x12));
}
// Reset the stack to the callee saved registers.
static_assert(
EntryFrameConstants::kFixedFrameSize % (2 * kSystemPointerSize) == 0,
"Size of entry frame is not a multiple of 16 bytes");
__ Drop(EntryFrameConstants::kFixedFrameSize / kSystemPointerSize);
// Restore the callee-saved registers and return.
__ PopCalleeSavedRegisters();
__ Ret();
}
} // namespace
void Builtins::Generate_JSEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY, Builtin::kJSEntryTrampoline);
}
void Builtins::Generate_JSConstructEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::CONSTRUCT_ENTRY,
Builtin::kJSConstructEntryTrampoline);
}
void Builtins::Generate_JSRunMicrotasksEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtin::kRunMicrotasksTrampoline);
}
// Input:
// x1: new.target.
// x2: function.
// x3: receiver.
// x4: argc.
// x5: argv.
// Output:
// x0: result.
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
Register new_target = x1;
Register function = x2;
Register receiver = x3;
Register argc = x4;
Register argv = x5;
Register scratch = x10;
Register slots_to_claim = x11;
{
// Enter an internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
// Setup the context (we need to use the caller context from the isolate).
__ Mov(scratch, ExternalReference::Create(IsolateAddressId::kContextAddress,
masm->isolate()));
__ Ldr(cp, MemOperand(scratch));
// Claim enough space for the arguments, the receiver and the function,
// including an optional slot of padding.
__ Add(slots_to_claim, argc, 3);
__ Bic(slots_to_claim, slots_to_claim, 1);
// Check if we have enough stack space to push all arguments.
Label enough_stack_space, stack_overflow;
__ StackOverflowCheck(slots_to_claim, &stack_overflow);
__ B(&enough_stack_space);
__ Bind(&stack_overflow);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ Unreachable();
__ Bind(&enough_stack_space);
__ Claim(slots_to_claim);
// Store padding (which might be overwritten).
__ SlotAddress(scratch, slots_to_claim);
__ Str(padreg, MemOperand(scratch, -kSystemPointerSize));
// Store receiver on the stack.
__ Poke(receiver, 0);
// Store function on the stack.
__ SlotAddress(scratch, argc);
__ Str(function, MemOperand(scratch, kSystemPointerSize));
// Copy arguments to the stack in a loop, in reverse order.
// x4: argc.
// x5: argv.
Label loop, done;
// Skip the argument set up if we have no arguments.
__ Cbz(argc, &done);
// scratch has been set to point to the location of the function, which
// marks the end of the argument copy.
__ SlotAddress(x0, 1); // Skips receiver.
__ Bind(&loop);
// Load the handle.
__ Ldr(x11, MemOperand(argv, kSystemPointerSize, PostIndex));
// Dereference the handle.
__ Ldr(x11, MemOperand(x11));
// Poke the result into the stack.
__ Str(x11, MemOperand(x0, kSystemPointerSize, PostIndex));
// Loop if we've not reached the end of copy marker.
__ Cmp(x0, scratch);
__ B(le, &loop);
__ Bind(&done);
__ Mov(x0, argc);
__ Mov(x3, new_target);
__ Mov(x1, function);
// x0: argc.
// x1: function.
// x3: new.target.
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
// The original values have been saved in JSEntry.
__ LoadRoot(x19, RootIndex::kUndefinedValue);
__ Mov(x20, x19);
__ Mov(x21, x19);
__ Mov(x22, x19);
__ Mov(x23, x19);
__ Mov(x24, x19);
__ Mov(x25, x19);
#ifndef V8_COMPRESS_POINTERS_IN_SHARED_CAGE
__ Mov(x28, x19);
#endif
// Don't initialize the reserved registers.
// x26 : root register (kRootRegister).
// x27 : context pointer (cp).
// x28 : pointer cage base register (kPtrComprCageBaseRegister).
// x29 : frame pointer (fp).
Handle<Code> builtin = is_construct
? BUILTIN_CODE(masm->isolate(), Construct)
: masm->isolate()->builtins()->Call();
__ Call(builtin, RelocInfo::CODE_TARGET);
// Exit the JS internal frame and remove the parameters (except function),
// and return.
}
// Result is in x0. Return.
__ Ret();
}
void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, false);
}
void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, true);
}
void Builtins::Generate_RunMicrotasksTrampoline(MacroAssembler* masm) {
// This expects two C++ function parameters passed by Invoke() in
// execution.cc.
// x0: root_register_value
// x1: microtask_queue
__ Mov(RunMicrotasksDescriptor::MicrotaskQueueRegister(), x1);
__ Jump(BUILTIN_CODE(masm->isolate(), RunMicrotasks), RelocInfo::CODE_TARGET);
}
static void ReplaceClosureCodeWithOptimizedCode(MacroAssembler* masm,
Register optimized_code,
Register closure) {
ASM_CODE_COMMENT(masm);
DCHECK(!AreAliased(optimized_code, closure));
// Store code entry in the closure.
__ AssertCodeT(optimized_code);
__ StoreTaggedField(optimized_code,
FieldMemOperand(closure, JSFunction::kCodeOffset));
__ RecordWriteField(closure, JSFunction::kCodeOffset, optimized_code,
kLRHasNotBeenSaved, SaveFPRegsMode::kIgnore,
RememberedSetAction::kOmit, SmiCheck::kOmit);
}
static void LeaveInterpreterFrame(MacroAssembler* masm, Register scratch1,
Register scratch2) {
ASM_CODE_COMMENT(masm);
Register params_size = scratch1;
// Get the size of the formal parameters + receiver (in bytes).
__ Ldr(params_size,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ Ldr(params_size.W(),
FieldMemOperand(params_size, BytecodeArray::kParameterSizeOffset));
Register actual_params_size = scratch2;
// Compute the size of the actual parameters + receiver (in bytes).
__ Ldr(actual_params_size,
MemOperand(fp, StandardFrameConstants::kArgCOffset));
__ lsl(actual_params_size, actual_params_size, kSystemPointerSizeLog2);
__ Add(actual_params_size, actual_params_size, Operand(kSystemPointerSize));
// If actual is bigger than formal, then we should use it to free up the stack
// arguments.
Label corrected_args_count;
__ Cmp(params_size, actual_params_size);