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builtins-riscv64.cc
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builtins-riscv64.cc
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// Copyright 2021 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_RISCV64
#include "src/api/api-arguments.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/interface-descriptors-inl.h"
#include "src/debug/debug.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames.h"
#include "src/logging/counters.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/codegen/riscv64/constants-riscv64.h"
#include "src/heap/heap-inl.h"
#include "src/objects/cell.h"
#include "src/objects/foreign.h"
#include "src/objects/heap-number.h"
#include "src/objects/js-generator.h"
#include "src/objects/objects-inl.h"
#include "src/objects/smi.h"
#include "src/runtime/runtime.h"
#include "src/wasm/wasm-linkage.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm, Address address) {
ASM_CODE_COMMENT(masm);
__ li(kJavaScriptCallExtraArg1Register, ExternalReference::Create(address));
__ Jump(BUILTIN_CODE(masm->isolate(), AdaptorWithBuiltinExitFrame),
RelocInfo::CODE_TARGET);
}
static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
Runtime::FunctionId function_id) {
// ----------- S t a t e -------------
// -- a0 : actual argument count
// -- a1 : target function (preserved for callee)
// -- a3 : 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.
// Push function as parameter to the runtime call.
__ SmiTag(kJavaScriptCallArgCountRegister);
__ Push(kJavaScriptCallTargetRegister, kJavaScriptCallNewTargetRegister,
kJavaScriptCallArgCountRegister, kJavaScriptCallTargetRegister);
__ CallRuntime(function_id, 1);
// Use the return value before restoring a0
__ Add64(a2, a0, Operand(Code::kHeaderSize - kHeapObjectTag));
// Restore target function, new target and actual argument count.
__ Pop(kJavaScriptCallTargetRegister, kJavaScriptCallNewTargetRegister,
kJavaScriptCallArgCountRegister);
__ SmiUntag(kJavaScriptCallArgCountRegister);
}
static_assert(kJavaScriptCallCodeStartRegister == a2, "ABI mismatch");
__ Jump(a2);
}
namespace {
void Generate_JSBuiltinsConstructStubHelper(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : number of arguments
// -- a1 : constructor function
// -- a3 : new target
// -- cp : context
// -- ra : return address
// -- sp[...]: constructor arguments
// -----------------------------------
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ SmiTag(a0);
__ Push(cp, a0);
__ SmiUntag(a0);
// Set up pointer to last argument (skip receiver).
UseScratchRegisterScope temps(masm);
temps.Include(t0);
Register scratch = temps.Acquire();
__ Add64(
scratch, fp,
Operand(StandardFrameConstants::kCallerSPOffset + kSystemPointerSize));
// Copy arguments and receiver to the expression stack.
__ PushArray(scratch, a0);
// The receiver for the builtin/api call.
__ PushRoot(RootIndex::kTheHoleValue);
// Call the function.
// a0: number of arguments (untagged)
// a1: constructor function
// a3: new target
__ InvokeFunctionWithNewTarget(a1, a3, a0, InvokeType::kCall);
// Restore context from the frame.
__ Ld(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// Restore smi-tagged arguments count from the frame.
__ Ld(kScratchReg, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
__ SmiScale(kScratchReg, kScratchReg, kSystemPointerSizeLog2);
__ Add64(sp, sp, kScratchReg);
__ Add64(sp, sp, kSystemPointerSize);
__ Ret();
}
} // namespace
// The construct stub for ES5 constructor functions and ES6 class constructors.
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0: number of arguments (untagged)
// -- a1: constructor function
// -- a3: new target
// -- cp: context
// -- ra: return address
// -- sp[...]: constructor arguments
// -----------------------------------
UseScratchRegisterScope temps(masm);
temps.Include(t0, t1);
// Enter a construct frame.
FrameScope scope(masm, StackFrame::MANUAL);
Label post_instantiation_deopt_entry, not_create_implicit_receiver;
__ EnterFrame(StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ SmiTag(a0);
__ Push(cp, a0, a1);
__ PushRoot(RootIndex::kUndefinedValue);
__ Push(a3);
// ----------- S t a t e -------------
// -- sp[0*kSystemPointerSize]: new target
// -- sp[1*kSystemPointerSize]: padding
// -- a1 and sp[2*kSystemPointerSize]: constructor function
// -- sp[3*kSystemPointerSize]: number of arguments (tagged)
// -- sp[4*kSystemPointerSize]: context
// -----------------------------------
{
UseScratchRegisterScope temps(masm);
Register func_info = temps.Acquire();
__ LoadTaggedPointerField(
func_info, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ Lwu(func_info,
FieldMemOperand(func_info, SharedFunctionInfo::kFlagsOffset));
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(func_info);
__ JumpIfIsInRange(func_info, kDefaultDerivedConstructor,
kDerivedConstructor, ¬_create_implicit_receiver);
Register scratch = func_info;
Register scratch2 = temps.Acquire();
// If not derived class constructor: Allocate the new receiver object.
__ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1,
scratch, scratch2);
__ Call(BUILTIN_CODE(masm->isolate(), FastNewObject),
RelocInfo::CODE_TARGET);
__ BranchShort(&post_instantiation_deopt_entry);
// Else: use TheHoleValue as receiver for constructor call
__ bind(¬_create_implicit_receiver);
__ LoadRoot(a0, RootIndex::kTheHoleValue);
}
// ----------- S t a t e -------------
// -- a0: 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.
__ Pop(a3);
// Push the allocated receiver to the stack.
__ Push(a0);
// We need two copies because we may have to return the original one
// and the calling conventions dictate that the called function pops the
// receiver. The second copy is pushed after the arguments, we saved in a6
// since a0 will store the return value of callRuntime.
__ Move(a6, a0);
// Set up pointer to last argument.
Register scratch = temps.Acquire();
__ Add64(
scratch, fp,
Operand(StandardFrameConstants::kCallerSPOffset + kSystemPointerSize));
// ----------- S t a t e -------------
// -- a3: new target
// -- sp[0*kSystemPointerSize]: implicit receiver
// -- sp[1*kSystemPointerSize]: implicit receiver
// -- sp[2*kSystemPointerSize]: padding
// -- sp[3*kSystemPointerSize]: constructor function
// -- sp[4*kSystemPointerSize]: number of arguments (tagged)
// -- sp[5*kSystemPointerSize]: context
// -----------------------------------
// Restore constructor function and argument count.
__ Ld(a1, MemOperand(fp, ConstructFrameConstants::kConstructorOffset));
__ Ld(a0, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
__ SmiUntag(a0);
Label stack_overflow;
{
UseScratchRegisterScope temps(masm);
__ StackOverflowCheck(a0, temps.Acquire(), temps.Acquire(),
&stack_overflow);
}
// 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 and receiver to the expression stack.
__ PushArray(scratch, a0);
// We need two copies because we may have to return the original one
// and the calling conventions dictate that the called function pops the
// receiver. The second copy is pushed after the arguments,
__ Push(a6);
// Call the function.
__ InvokeFunctionWithNewTarget(a1, a3, a0, InvokeType::kCall);
// ----------- S t a t e -------------
// -- a0: constructor result
// -- 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());
// Restore the context from the frame.
__ Ld(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// 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.
__ JumpIfNotRoot(a0, RootIndex::kUndefinedValue, &check_receiver);
// Otherwise we do a smi check and fall through to check if the return value
// is a valid receiver.
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ Ld(a0, MemOperand(sp, 0 * kSystemPointerSize));
__ JumpIfRoot(a0, RootIndex::kTheHoleValue, &do_throw);
__ bind(&leave_and_return);
// Restore smi-tagged arguments count from the frame.
__ Ld(a1, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
__ LeaveFrame(StackFrame::CONSTRUCT);
// Remove caller arguments from the stack and return.
__ SmiScale(a4, a1, kSystemPointerSizeLog2);
__ Add64(sp, sp, a4);
__ Add64(sp, sp, kSystemPointerSize);
__ Ret();
__ bind(&check_receiver);
__ JumpIfSmi(a0, &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.
{
UseScratchRegisterScope temps(masm);
Register map = temps.Acquire(), type = temps.Acquire();
__ GetObjectType(a0, map, type);
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ Branch(&leave_and_return, greater_equal, type,
Operand(FIRST_JS_RECEIVER_TYPE));
__ Branch(&use_receiver);
}
__ bind(&do_throw);
// Restore the context from the frame.
__ Ld(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
__ break_(0xCC);
__ bind(&stack_overflow);
// Restore the context from the frame.
__ Ld(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowStackOverflow);
__ break_(0xCC);
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSBuiltinsConstructStubHelper(masm);
}
// 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;
__ GetObjectType(sfi_data, scratch1, scratch1);
__ Branch(is_baseline, eq, scratch1, Operand(BASELINE_DATA_TYPE));
__ Branch(&done, ne, scratch1, Operand(INTERPRETER_DATA_TYPE),
Label::Distance::kNear);
__ LoadTaggedPointerField(
sfi_data,
FieldMemOperand(sfi_data, InterpreterData::kBytecodeArrayOffset));
__ bind(&done);
}
// static
void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : the value to pass to the generator
// -- a1 : the JSGeneratorObject to resume
// -- ra : return address
// -----------------------------------
// Store input value into generator object.
__ StoreTaggedField(
a0, FieldMemOperand(a1, JSGeneratorObject::kInputOrDebugPosOffset));
__ RecordWriteField(a1, JSGeneratorObject::kInputOrDebugPosOffset, a0,
kRAHasNotBeenSaved, SaveFPRegsMode::kIgnore);
// Check that a1 is still valid, RecordWrite might have clobbered it.
__ AssertGeneratorObject(a1);
// Load suspended function and context.
__ LoadTaggedPointerField(
a4, FieldMemOperand(a1, JSGeneratorObject::kFunctionOffset));
__ LoadTaggedPointerField(cp,
FieldMemOperand(a4, 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());
__ li(a5, debug_hook);
__ Lb(a5, MemOperand(a5));
__ Branch(&prepare_step_in_if_stepping, ne, a5, Operand(zero_reg));
// Flood function if we need to continue stepping in the suspended generator.
ExternalReference debug_suspended_generator =
ExternalReference::debug_suspended_generator_address(masm->isolate());
__ li(a5, debug_suspended_generator);
__ Ld(a5, MemOperand(a5));
__ Branch(&prepare_step_in_suspended_generator, eq, a1, Operand(a5));
__ 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(kScratchReg,
MacroAssembler::StackLimitKind::kRealStackLimit);
__ Branch(&stack_overflow, Uless, sp, Operand(kScratchReg));
// ----------- S t a t e -------------
// -- a1 : the JSGeneratorObject to resume
// -- a4 : generator function
// -- cp : generator context
// -- ra : return address
// -----------------------------------
// Push holes for arguments to generator function. Since the parser forced
// context allocation for any variables in generators, the actual argument
// values have already been copied into the context and these dummy values
// will never be used.
__ LoadTaggedPointerField(
a3, FieldMemOperand(a4, JSFunction::kSharedFunctionInfoOffset));
__ Lhu(a3,
FieldMemOperand(a3, SharedFunctionInfo::kFormalParameterCountOffset));
UseScratchRegisterScope temps(masm);
Register scratch = temps.Acquire();
__ LoadTaggedPointerField(
scratch,
FieldMemOperand(a1, JSGeneratorObject::kParametersAndRegistersOffset));
{
Label done_loop, loop;
__ bind(&loop);
__ Sub64(a3, a3, Operand(1));
__ Branch(&done_loop, lt, a3, Operand(zero_reg), Label::Distance::kNear);
__ CalcScaledAddress(kScratchReg, scratch, a3, kTaggedSizeLog2);
__ LoadAnyTaggedField(
kScratchReg, FieldMemOperand(kScratchReg, FixedArray::kHeaderSize));
__ Push(kScratchReg);
__ Branch(&loop);
__ bind(&done_loop);
// Push receiver.
__ LoadAnyTaggedField(
kScratchReg, FieldMemOperand(a1, JSGeneratorObject::kReceiverOffset));
__ Push(kScratchReg);
}
// Underlying function needs to have bytecode available.
if (FLAG_debug_code) {
Label is_baseline;
__ LoadTaggedPointerField(
a3, FieldMemOperand(a4, JSFunction::kSharedFunctionInfoOffset));
__ LoadTaggedPointerField(
a3, FieldMemOperand(a3, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecodeOrBaseline(masm, a3, a0, &is_baseline);
__ GetObjectType(a3, a3, a3);
__ Assert(eq, AbortReason::kMissingBytecodeArray, a3,
Operand(BYTECODE_ARRAY_TYPE));
__ bind(&is_baseline);
}
// Resume (Ignition/TurboFan) generator object.
{
__ LoadTaggedPointerField(
a0, FieldMemOperand(a4, JSFunction::kSharedFunctionInfoOffset));
__ Lhu(a0, FieldMemOperand(
a0, 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.
__ Move(a3, a1);
__ Move(a1, a4);
static_assert(kJavaScriptCallCodeStartRegister == a2, "ABI mismatch");
__ LoadTaggedPointerField(a2, FieldMemOperand(a1, JSFunction::kCodeOffset));
__ JumpCodeObject(a2);
}
__ bind(&prepare_step_in_if_stepping);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(a1, a4);
// Push hole as receiver since we do not use it for stepping.
__ PushRoot(RootIndex::kTheHoleValue);
__ CallRuntime(Runtime::kDebugOnFunctionCall);
__ Pop(a1);
}
__ LoadTaggedPointerField(
a4, FieldMemOperand(a1, JSGeneratorObject::kFunctionOffset));
__ Branch(&stepping_prepared);
__ bind(&prepare_step_in_suspended_generator);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(a1);
__ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
__ Pop(a1);
}
__ LoadTaggedPointerField(
a4, FieldMemOperand(a1, JSGeneratorObject::kFunctionOffset));
__ Branch(&stepping_prepared);
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ break_(0xCC); // This should be unreachable.
}
}
void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(a1);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable);
}
// Clobbers scratch1 and scratch2; preserves all other registers.
static void Generate_CheckStackOverflow(MacroAssembler* masm, Register argc,
Register scratch1, Register scratch2) {
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
Label okay;
__ LoadStackLimit(scratch1, MacroAssembler::StackLimitKind::kRealStackLimit);
// Make a2 the space we have left. The stack might already be overflowed
// here which will cause r2 to become negative.
__ Sub64(scratch1, sp, scratch1);
// Check if the arguments will overflow the stack.
__ Sll64(scratch2, argc, kSystemPointerSizeLog2);
__ Branch(&okay, gt, scratch1, Operand(scratch2),
Label::Distance::kNear); // Signed comparison.
// Out of stack space.
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bind(&okay);
}
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** args)>;
// or
// using JSEntryFunction = GeneratedCode<Address(
// Address root_register_value, MicrotaskQueue* microtask_queue)>;
void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
Builtin entry_trampoline) {
Label invoke, handler_entry, exit;
{
NoRootArrayScope no_root_array(masm);
// TODO(plind): unify the ABI description here.
// Registers:
// either
// a0: root register value
// a1: entry address
// a2: function
// a3: receiver
// a4: argc
// a5: argv
// or
// a0: root register value
// a1: microtask_queue
// Save callee saved registers on the stack.
__ MultiPush(kCalleeSaved | ra.bit());
// Save callee-saved FPU registers.
__ MultiPushFPU(kCalleeSavedFPU);
// Set up the reserved register for 0.0.
__ LoadFPRImmediate(kDoubleRegZero, 0.0);
// Initialize the root register.
// C calling convention. The first argument is passed in a0.
__ Move(kRootRegister, a0);
#ifdef V8_COMPRESS_POINTERS_IN_SHARED_CAGE
// Initialize the pointer cage base register.
__ LoadRootRelative(kPtrComprCageBaseRegister,
IsolateData::cage_base_offset());
#endif
}
// a1: entry address
// a2: function
// a3: receiver
// a4: argc
// a5: argv
// We build an EntryFrame.
__ li(s1, Operand(-1)); // Push a bad frame pointer to fail if it is used.
__ li(s2, Operand(StackFrame::TypeToMarker(type)));
__ li(s3, Operand(StackFrame::TypeToMarker(type)));
ExternalReference c_entry_fp = ExternalReference::Create(
IsolateAddressId::kCEntryFPAddress, masm->isolate());
__ li(s4, c_entry_fp);
__ Ld(s4, MemOperand(s4));
__ Push(s1, s2, s3, s4);
// Set up frame pointer for the frame to be pushed.
__ Add64(fp, sp, -EntryFrameConstants::kCallerFPOffset);
// Registers:
// either
// a1: entry address
// a2: function
// a3: receiver
// a4: argc
// a5: argv
// or
// a1: microtask_queue
//
// Stack:
// caller fp |
// function slot | entry frame
// context slot |
// bad fp (0xFF...F) |
// callee saved registers + ra
// [ O32: 4 args slots]
// args
// If this is the outermost JS call, set js_entry_sp value.
Label non_outermost_js;
ExternalReference js_entry_sp = ExternalReference::Create(
IsolateAddressId::kJSEntrySPAddress, masm->isolate());
__ li(s1, js_entry_sp);
__ Ld(s2, MemOperand(s1));
__ Branch(&non_outermost_js, ne, s2, Operand(zero_reg),
Label::Distance::kNear);
__ Sd(fp, MemOperand(s1));
__ li(s3, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
Label cont;
__ Branch(&cont);
__ bind(&non_outermost_js);
__ li(s3, Operand(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
__ push(s3);
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ BranchShort(&invoke);
__ bind(&handler_entry);
// Store the current pc as the handler offset. It's used later to create the
// handler table.
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 the PushStackHandler below sets it to 0 to
// signal the existence of the JSEntry frame.
__ li(s1, ExternalReference::Create(
IsolateAddressId::kPendingExceptionAddress, masm->isolate()));
__ Sd(a0, MemOperand(s1)); // We come back from 'invoke'. result is in a0.
__ LoadRoot(a0, RootIndex::kException);
__ BranchShort(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
__ PushStackHandler();
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the bal(&invoke) above, which
// restores all kCalleeSaved registers (including cp and fp) to their
// saved values before returning a failure to C.
//
// Registers:
// either
// a0: root register value
// a1: entry address
// a2: function
// a3: receiver
// a4: argc
// a5: argv
// or
// a0: root register value
// a1: microtask_queue
//
// Stack:
// handler frame
// entry frame
// callee saved registers + ra
// [ O32: 4 args slots]
// args
//
// 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);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit); // a0 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(a5);
__ Branch(&non_outermost_js_2, ne, a5,
Operand(StackFrame::OUTERMOST_JSENTRY_FRAME),
Label::Distance::kNear);
__ li(a5, js_entry_sp);
__ Sd(zero_reg, MemOperand(a5));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(a5);
__ li(a4, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ Sd(a5, MemOperand(a4));
// Reset the stack to the callee saved registers.
__ Add64(sp, sp, -EntryFrameConstants::kCallerFPOffset);
// Restore callee-saved fpu registers.
__ MultiPopFPU(kCalleeSavedFPU);
// Restore callee saved registers from the stack.
__ MultiPop(kCalleeSaved | ra.bit());
// Return.
__ Jump(ra);
}
} // 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);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// ----------- S t a t e -------------
// -- a1: new.target
// -- a2: function
// -- a3: receiver_pointer
// -- a4: argc
// -- a5: argv
// -----------------------------------
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Setup the context (we need to use the caller context from the isolate).
ExternalReference context_address = ExternalReference::Create(
IsolateAddressId::kContextAddress, masm->isolate());
__ li(cp, context_address);
__ Ld(cp, MemOperand(cp));
// Push the function onto the stack.
__ Push(a2);
// Check if we have enough stack space to push all arguments.
__ Add64(a6, a4, 1);
Generate_CheckStackOverflow(masm, a6, a0, s2);
// Copy arguments to the stack in a loop.
// a4: argc
// a5: argv, i.e. points to first arg
Label loop, entry;
__ CalcScaledAddress(s1, a5, a4, kSystemPointerSizeLog2);
__ BranchShort(&entry);
// s1 points past last arg.
__ bind(&loop);
__ Add64(s1, s1, -kSystemPointerSize);
__ Ld(s2, MemOperand(s1)); // Read next parameter.
__ Ld(s2, MemOperand(s2)); // Dereference handle.
__ push(s2); // Push parameter.
__ bind(&entry);
__ Branch(&loop, ne, a5, Operand(s1));
// Push the receive.
__ Push(a3);
// a0: argc
// a1: function
// a3: new.target
__ Move(a3, a1);
__ Move(a1, a2);
__ Move(a0, a4);
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(a4, RootIndex::kUndefinedValue);
__ Move(a5, a4);
__ Move(s1, a4);
__ Move(s2, a4);
__ Move(s3, a4);
__ Move(s4, a4);
__ Move(s5, a4);
#ifndef V8_COMPRESS_POINTERS_IN_SHARED_CAGE
__ Move(s11, a4);
#endif
// s6 holds the root address. Do not clobber.
// s7 is cp. Do not init.
// Invoke the code.
Handle<Code> builtin = is_construct
? BUILTIN_CODE(masm->isolate(), Construct)
: masm->isolate()->builtins()->Call();
__ Call(builtin, RelocInfo::CODE_TARGET);
// Leave internal frame.
}
__ Jump(ra);
}
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) {
// a1: microtask_queue
__ Move(RunMicrotasksDescriptor::MicrotaskQueueRegister(), a1);
__ Jump(BUILTIN_CODE(masm->isolate(), RunMicrotasks), RelocInfo::CODE_TARGET);
}
static void ReplaceClosureCodeWithOptimizedCode(MacroAssembler* masm,
Register optimized_code,
Register closure,
Register scratch1,
Register scratch2) {
ASM_CODE_COMMENT(masm);
DCHECK(!AreAliased(optimized_code, closure));
// Store code entry in the closure.
__ StoreTaggedField(optimized_code,
FieldMemOperand(closure, JSFunction::kCodeOffset));
__ Move(scratch1, optimized_code); // Write barrier clobbers scratch1 below.
__ RecordWriteField(closure, JSFunction::kCodeOffset, scratch1,
kRAHasNotBeenSaved, 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).
__ Ld(params_size,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ Lw(params_size,
FieldMemOperand(params_size, BytecodeArray::kParameterSizeOffset));
Register actual_params_size = scratch2;
Label L1;
// Compute the size of the actual parameters + receiver (in bytes).
__ Ld(actual_params_size,
MemOperand(fp, StandardFrameConstants::kArgCOffset));
__ Sll64(actual_params_size, actual_params_size, kSystemPointerSizeLog2);
__ Add64(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.
__ Branch(&L1, le, actual_params_size, Operand(params_size),
Label::Distance::kNear);
__ Move(params_size, actual_params_size);
__ bind(&L1);
// Leave the frame (also dropping the register file).
__ LeaveFrame(StackFrame::INTERPRETED);
// Drop receiver + arguments.
__ Add64(sp, sp, params_size);
}
// Tail-call |function_id| if |actual_marker| == |expected_marker|
static void TailCallRuntimeIfMarkerEquals(MacroAssembler* masm,
Register actual_marker,
OptimizationMarker expected_marker,
Runtime::FunctionId function_id) {
ASM_CODE_COMMENT(masm);
Label no_match;
__ Branch(&no_match, ne, actual_marker, Operand(expected_marker),
Label::Distance::kNear);
GenerateTailCallToReturnedCode(masm, function_id);
__ bind(&no_match);
}
static void TailCallOptimizedCodeSlot(MacroAssembler* masm,
Register optimized_code_entry,
Register scratch1, Register scratch2) {
// ----------- S t a t e -------------
// -- a0 : actual argument count
// -- a3 : new target (preserved for callee if needed, and caller)
// -- a1 : target function (preserved for callee if needed, and caller)
// -----------------------------------
ASM_CODE_COMMENT(masm);
DCHECK(!AreAliased(optimized_code_entry, a1, a3, scratch1, scratch2));
Register closure = a1;
Label heal_optimized_code_slot;
// If the optimized code is cleared, go to runtime to update the optimization
// marker field.
__ LoadWeakValue(optimized_code_entry, optimized_code_entry,
&heal_optimized_code_slot);
// Check if the optimized code is marked for deopt. If it is, call the
// runtime to clear it.
__ LoadTaggedPointerField(
a5,
FieldMemOperand(optimized_code_entry, Code::kCodeDataContainerOffset));
__ Lw(a5, FieldMemOperand(a5, CodeDataContainer::kKindSpecificFlagsOffset));
__ And(a5, a5, Operand(1 << Code::kMarkedForDeoptimizationBit));
__ Branch(&heal_optimized_code_slot, ne, a5, Operand(zero_reg),
Label::Distance::kNear);
// Optimized code is good, get it into the closure and link the closure into
// the optimized functions list, then tail call the optimized code.
// The feedback vector is no longer used, so re-use it as a scratch
// register.
ReplaceClosureCodeWithOptimizedCode(masm, optimized_code_entry, closure,
scratch1, scratch2);
static_assert(kJavaScriptCallCodeStartRegister == a2, "ABI mismatch");
__ LoadCodeObjectEntry(a2, optimized_code_entry);
__ Jump(a2);
// Optimized code slot contains deoptimized code or code is cleared and
// optimized code marker isn't updated. Evict the code, update the marker
// and re-enter the closure's code.
__ bind(&heal_optimized_code_slot);
GenerateTailCallToReturnedCode(masm, Runtime::kHealOptimizedCodeSlot);
}
static void MaybeOptimizeCode(MacroAssembler* masm, Register feedback_vector,
Register optimization_marker) {
// ----------- S t a t e -------------
// -- a0 : actual argument count
// -- a3 : new target (preserved for callee if needed, and caller)
// -- a1 : target function (preserved for callee if needed, and caller)
// -- feedback vector (preserved for caller if needed)
// -- optimization_marker : a int32 containing a non-zero optimization
// marker.
// -----------------------------------
ASM_CODE_COMMENT(masm);
DCHECK(!AreAliased(feedback_vector, a1, a3, optimization_marker));
// TODO(v8:8394): The logging of first execution will break if
// feedback vectors are not allocated. We need to find a different way of
// logging these events if required.
TailCallRuntimeIfMarkerEquals(masm, optimization_marker,
OptimizationMarker::kLogFirstExecution,
Runtime::kFunctionFirstExecution);
TailCallRuntimeIfMarkerEquals(masm, optimization_marker,
OptimizationMarker::kCompileOptimized,
Runtime::kCompileOptimized_NotConcurrent);
TailCallRuntimeIfMarkerEquals(masm, optimization_marker,
OptimizationMarker::kCompileOptimizedConcurrent,
Runtime::kCompileOptimized_Concurrent);
// Marker should be one of LogFirstExecution / CompileOptimized /
// CompileOptimizedConcurrent. InOptimizationQueue and None shouldn't reach
// here.
if (FLAG_debug_code) {
__ stop();
}
}
// Advance the current bytecode offset. This simulates what all bytecode
// handlers do upon completion of the underlying operation. Will bail out to a
// label if the bytecode (without prefix) is a return bytecode. Will not advance
// the bytecode offset if the current bytecode is a JumpLoop, instead just
// re-executing the JumpLoop to jump to the correct bytecode.
static void AdvanceBytecodeOffsetOrReturn(MacroAssembler* masm,
Register bytecode_array,
Register bytecode_offset,
Register bytecode, Register scratch1,
Register scratch2, Register scratch3,
Label* if_return) {
ASM_CODE_COMMENT(masm);
Register bytecode_size_table = scratch1;
// The bytecode offset value will be increased by one in wide and extra wide
// cases. In the case of having a wide or extra wide JumpLoop bytecode, we
// will restore the original bytecode. In order to simplify the code, we have
// a backup of it.
Register original_bytecode_offset = scratch3;
DCHECK(!AreAliased(bytecode_array, bytecode_offset, bytecode,
bytecode_size_table, original_bytecode_offset));
__ Move(original_bytecode_offset, bytecode_offset);
__ li(bytecode_size_table, ExternalReference::bytecode_size_table_address());
// Check if the bytecode is a Wide or ExtraWide prefix bytecode.
Label process_bytecode, extra_wide;
STATIC_ASSERT(0 == static_cast<int>(interpreter::Bytecode::kWide));
STATIC_ASSERT(1 == static_cast<int>(interpreter::Bytecode::kExtraWide));
STATIC_ASSERT(2 == static_cast<int>(interpreter::Bytecode::kDebugBreakWide));
STATIC_ASSERT(3 ==
static_cast<int>(interpreter::Bytecode::kDebugBreakExtraWide));
__ Branch(&process_bytecode, Ugreater, bytecode, Operand(3),
Label::Distance::kNear);
__ And(scratch2, bytecode, Operand(1));
__ Branch(&extra_wide, ne, scratch2, Operand(zero_reg),
Label::Distance::kNear);
// Load the next bytecode and update table to the wide scaled table.
__ Add64(bytecode_offset, bytecode_offset, Operand(1));
__ Add64(scratch2, bytecode_array, bytecode_offset);
__ Lbu(bytecode, MemOperand(scratch2));
__ Add64(bytecode_size_table, bytecode_size_table,
Operand(kByteSize * interpreter::Bytecodes::kBytecodeCount));
__ BranchShort(&process_bytecode);
__ bind(&extra_wide);