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builtins-arm.cc
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builtins-arm.cc
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// Copyright 2012 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_ARM
#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/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
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm, Address address) {
#if defined(__thumb__)
// Thumb mode builtin.
DCHECK_EQ(1, reinterpret_cast<uintptr_t>(
ExternalReference::Create(address).address()) &
1);
#endif
__ Move(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 -------------
// -- r0 : actual argument count
// -- r1 : target function (preserved for callee)
// -- r3 : new target (preserved for callee)
// -----------------------------------
{
FrameAndConstantPoolScope 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);
__ mov(r2, r0);
// Restore target function, new target and actual argument count.
__ Pop(kJavaScriptCallTargetRegister, kJavaScriptCallNewTargetRegister,
kJavaScriptCallArgCountRegister);
__ SmiUntag(kJavaScriptCallArgCountRegister);
}
static_assert(kJavaScriptCallCodeStartRegister == r2, "ABI mismatch");
__ JumpCodeObject(r2);
}
namespace {
void Generate_JSBuiltinsConstructStubHelper(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : number of arguments
// -- r1 : constructor function
// -- r3 : new target
// -- cp : context
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Register scratch = r2;
Label stack_overflow;
__ StackOverflowCheck(r0, scratch, &stack_overflow);
// Enter a construct frame.
{
FrameAndConstantPoolScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ SmiTag(r0);
__ Push(cp, r0);
__ SmiUntag(r0);
// 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.
// Set up pointer to last argument (skip receiver).
__ add(
r4, fp,
Operand(StandardFrameConstants::kCallerSPOffset + kSystemPointerSize));
// Copy arguments and receiver to the expression stack.
__ PushArray(r4, r0, r5);
// The receiver for the builtin/api call.
__ PushRoot(RootIndex::kTheHoleValue);
// Call the function.
// r0: number of arguments (untagged)
// r1: constructor function
// r3: new target
__ InvokeFunctionWithNewTarget(r1, r3, r0, InvokeType::kCall);
// Restore context from the frame.
__ ldr(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// Restore smi-tagged arguments count from the frame.
__ ldr(scratch, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
__ DropArguments(scratch, TurboAssembler::kCountIsSmi,
TurboAssembler::kCountExcludesReceiver);
__ Jump(lr);
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bkpt(0); // Unreachable code.
}
}
} // namespace
// The construct stub for ES5 constructor functions and ES6 class constructors.
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0: number of arguments (untagged)
// -- r1: constructor function
// -- r3: new target
// -- cp: context
// -- lr: return address
// -- sp[...]: constructor arguments
// -----------------------------------
FrameScope scope(masm, StackFrame::MANUAL);
// Enter a construct frame.
Label post_instantiation_deopt_entry, not_create_implicit_receiver;
__ EnterFrame(StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ LoadRoot(r4, RootIndex::kTheHoleValue);
__ SmiTag(r0);
__ Push(cp, r0, r1, r4, r3);
// ----------- S t a t e -------------
// -- sp[0*kPointerSize]: new target
// -- sp[1*kPointerSize]: padding
// -- r1 and sp[2*kPointerSize]: constructor function
// -- sp[3*kPointerSize]: number of arguments (tagged)
// -- sp[4*kPointerSize]: context
// -----------------------------------
__ ldr(r4, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r4, FieldMemOperand(r4, SharedFunctionInfo::kFlagsOffset));
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(r4);
__ JumpIfIsInRange(r4, kDefaultDerivedConstructor, kDerivedConstructor,
¬_create_implicit_receiver);
// If not derived class constructor: Allocate the new receiver object.
__ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1, r4,
r5);
__ 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(r0, RootIndex::kTheHoleValue);
// ----------- S t a t e -------------
// -- r0: receiver
// -- Slot 3 / sp[0*kPointerSize]: new target
// -- Slot 2 / sp[1*kPointerSize]: constructor function
// -- Slot 1 / sp[2*kPointerSize]: number of arguments (tagged)
// -- Slot 0 / sp[3*kPointerSize]: context
// -----------------------------------
// Deoptimizer enters here.
masm->isolate()->heap()->SetConstructStubCreateDeoptPCOffset(
masm->pc_offset());
__ bind(&post_instantiation_deopt_entry);
// Restore new target.
__ Pop(r3);
// Push the allocated receiver to the stack.
__ Push(r0);
// 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 r6
// since r0 needs to store the number of arguments before
// InvokingFunction.
__ mov(r6, r0);
// Set up pointer to first argument (skip receiver).
__ add(r4, fp,
Operand(StandardFrameConstants::kCallerSPOffset + kSystemPointerSize));
// Restore constructor function and argument count.
__ ldr(r1, MemOperand(fp, ConstructFrameConstants::kConstructorOffset));
__ ldr(r0, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
__ SmiUntag(r0);
Label stack_overflow;
__ StackOverflowCheck(r0, r5, &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 to the expression stack.
__ PushArray(r4, r0, r5);
// Push implicit receiver.
__ Push(r6);
// Call the function.
__ InvokeFunctionWithNewTarget(r1, r3, r0, InvokeType::kCall);
// ----------- S t a t e -------------
// -- r0: constructor result
// -- sp[0*kPointerSize]: implicit receiver
// -- sp[1*kPointerSize]: padding
// -- sp[2*kPointerSize]: constructor function
// -- sp[3*kPointerSize]: number of arguments
// -- sp[4*kPointerSize]: 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.
__ JumpIfNotRoot(r0, 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);
__ ldr(r0, MemOperand(sp, 0 * kPointerSize));
__ JumpIfRoot(r0, RootIndex::kTheHoleValue, &do_throw);
__ bind(&leave_and_return);
// Restore smi-tagged arguments count from the frame.
__ ldr(r1, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
__ LeaveFrame(StackFrame::CONSTRUCT);
// Remove caller arguments from the stack and return.
__ DropArguments(r1, TurboAssembler::kCountIsSmi,
TurboAssembler::kCountExcludesReceiver);
__ Jump(lr);
__ bind(&check_receiver);
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(r0, &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);
__ CompareObjectType(r0, r4, r5, FIRST_JS_RECEIVER_TYPE);
__ b(ge, &leave_and_return);
__ b(&use_receiver);
__ bind(&do_throw);
// Restore the context from the frame.
__ ldr(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
__ bkpt(0);
__ bind(&stack_overflow);
// Restore the context from the frame.
__ ldr(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowStackOverflow);
// Unreachable code.
__ bkpt(0);
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSBuiltinsConstructStubHelper(masm);
}
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, Operand(INTERPRETER_DATA_TYPE));
__ b(ne, &done);
__ ldr(sfi_data,
FieldMemOperand(sfi_data, InterpreterData::kBytecodeArrayOffset));
__ bind(&done);
}
// static
void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : the value to pass to the generator
// -- r1 : the JSGeneratorObject to resume
// -- lr : return address
// -----------------------------------
// Store input value into generator object.
__ str(r0, FieldMemOperand(r1, JSGeneratorObject::kInputOrDebugPosOffset));
__ RecordWriteField(r1, JSGeneratorObject::kInputOrDebugPosOffset, r0,
kLRHasNotBeenSaved, SaveFPRegsMode::kIgnore);
// Check that r1 is still valid, RecordWrite might have clobbered it.
__ AssertGeneratorObject(r1);
// Load suspended function and context.
__ ldr(r4, FieldMemOperand(r1, JSGeneratorObject::kFunctionOffset));
__ ldr(cp, FieldMemOperand(r4, JSFunction::kContextOffset));
Label prepare_step_in_if_stepping, prepare_step_in_suspended_generator;
Label stepping_prepared;
Register scratch = r5;
// Flood function if we are stepping.
ExternalReference debug_hook =
ExternalReference::debug_hook_on_function_call_address(masm->isolate());
__ Move(scratch, debug_hook);
__ ldrsb(scratch, MemOperand(scratch));
__ cmp(scratch, Operand(0));
__ b(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());
__ Move(scratch, debug_suspended_generator);
__ ldr(scratch, MemOperand(scratch));
__ cmp(scratch, Operand(r1));
__ b(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(scratch, StackLimitKind::kRealStackLimit);
__ cmp(sp, scratch);
__ b(lo, &stack_overflow);
// ----------- S t a t e -------------
// -- r1 : the JSGeneratorObject to resume
// -- r4 : generator function
// -- cp : generator context
// -- lr : return address
// -- sp[0] : generator receiver
// -----------------------------------
// Copy the function arguments from the generator object's register file.
__ ldr(r3, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ ldrh(r3,
FieldMemOperand(r3, SharedFunctionInfo::kFormalParameterCountOffset));
__ ldr(r2,
FieldMemOperand(r1, JSGeneratorObject::kParametersAndRegistersOffset));
{
Label done_loop, loop;
__ bind(&loop);
__ sub(r3, r3, Operand(1), SetCC);
__ b(lt, &done_loop);
__ add(scratch, r2, Operand(r3, LSL, kTaggedSizeLog2));
__ ldr(scratch, FieldMemOperand(scratch, FixedArray::kHeaderSize));
__ Push(scratch);
__ b(&loop);
__ bind(&done_loop);
// Push receiver.
__ ldr(scratch, FieldMemOperand(r1, JSGeneratorObject::kReceiverOffset));
__ Push(scratch);
}
// Underlying function needs to have bytecode available.
if (FLAG_debug_code) {
Label is_baseline;
__ ldr(r3, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r3, FieldMemOperand(r3, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecodeOrBaseline(masm, r3, r0, &is_baseline);
__ CompareObjectType(r3, r3, r3, BYTECODE_ARRAY_TYPE);
__ Assert(eq, AbortReason::kMissingBytecodeArray);
__ bind(&is_baseline);
}
// Resume (Ignition/TurboFan) generator object.
{
__ ldr(r0, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ ldrh(r0, FieldMemOperand(
r0, 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(r3, r1);
__ Move(r1, r4);
static_assert(kJavaScriptCallCodeStartRegister == r2, "ABI mismatch");
__ ldr(r2, FieldMemOperand(r1, JSFunction::kCodeOffset));
__ JumpCodeObject(r2);
}
__ bind(&prepare_step_in_if_stepping);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r1, r4);
// Push hole as receiver since we do not use it for stepping.
__ PushRoot(RootIndex::kTheHoleValue);
__ CallRuntime(Runtime::kDebugOnFunctionCall);
__ Pop(r1);
__ ldr(r4, FieldMemOperand(r1, JSGeneratorObject::kFunctionOffset));
}
__ b(&stepping_prepared);
__ bind(&prepare_step_in_suspended_generator);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r1);
__ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
__ Pop(r1);
__ ldr(r4, FieldMemOperand(r1, JSGeneratorObject::kFunctionOffset));
}
__ b(&stepping_prepared);
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bkpt(0); // This should be unreachable.
}
}
void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(r1);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable);
}
namespace {
// Total size of the stack space pushed by JSEntryVariant.
// JSEntryTrampoline uses this to access on stack arguments passed to
// JSEntryVariant.
constexpr int kPushedStackSpace = kNumCalleeSaved * kPointerSize -
kPointerSize /* FP */ +
kNumDoubleCalleeSaved * kDoubleSize +
5 * kPointerSize /* r5, r6, r7, fp, lr */ +
EntryFrameConstants::kCallerFPOffset;
// Assert that the EntryFrameConstants are in sync with the builtin.
static_assert(kPushedStackSpace == EntryFrameConstants::kDirectCallerSPOffset +
3 * kPointerSize /* r5, r6, r7*/ +
EntryFrameConstants::kCallerFPOffset,
"Pushed stack space and frame constants do not match. See "
"frame-constants-arm.h");
// 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)>;
void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
Builtin entry_trampoline) {
// The register state is either:
// r0: root_register_value
// r1: code entry
// r2: function
// r3: receiver
// [sp + 0 * kSystemPointerSize]: argc
// [sp + 1 * kSystemPointerSize]: argv
// or
// r0: root_register_value
// r1: microtask_queue
// Preserve all but r0 and pass them to entry_trampoline.
Label invoke, handler_entry, exit;
const RegList kCalleeSavedWithoutFp = kCalleeSaved & ~fp.bit();
// Update |pushed_stack_space| when we manipulate the stack.
int pushed_stack_space = EntryFrameConstants::kCallerFPOffset;
{
NoRootArrayScope no_root_array(masm);
// Called from C, so do not pop argc and args on exit (preserve sp)
// No need to save register-passed args
// Save callee-saved registers (incl. cp), but without fp
__ stm(db_w, sp, kCalleeSavedWithoutFp);
pushed_stack_space +=
kNumCalleeSaved * kPointerSize - kPointerSize /* FP */;
// Save callee-saved vfp registers.
__ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
pushed_stack_space += kNumDoubleCalleeSaved * kDoubleSize;
// Set up the reserved register for 0.0.
__ vmov(kDoubleRegZero, base::Double(0.0));
// Initialize the root register.
// C calling convention. The first argument is passed in r0.
__ mov(kRootRegister, r0);
}
// Push a frame with special values setup to mark it as an entry frame.
// r0: root_register_value
__ mov(r7, Operand(StackFrame::TypeToMarker(type)));
__ mov(r6, Operand(StackFrame::TypeToMarker(type)));
__ Move(r4, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ ldr(r5, MemOperand(r4));
__ stm(db_w, sp, r5.bit() | r6.bit() | r7.bit() | fp.bit() | lr.bit());
pushed_stack_space += 5 * kPointerSize /* r5, r6, r7, fp, lr */;
// Clear c_entry_fp, now we've pushed its previous value to 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.
__ mov(r5, Operand::Zero());
__ str(r5, MemOperand(r4));
Register scratch = r6;
// Set up frame pointer for the frame to be pushed.
__ add(fp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// 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());
__ Move(r5, js_entry_sp);
__ ldr(scratch, MemOperand(r5));
__ cmp(scratch, Operand::Zero());
__ b(ne, &non_outermost_js);
__ str(fp, MemOperand(r5));
__ mov(scratch, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
Label cont;
__ b(&cont);
__ bind(&non_outermost_js);
__ mov(scratch, Operand(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
__ push(scratch);
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ jmp(&invoke);
// Block literal pool emission whilst taking the position of the handler
// entry. This avoids making the assumption that literal pools are always
// emitted after an instruction is emitted, rather than before.
{
Assembler::BlockConstPoolScope block_const_pool(masm);
__ 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.
__ Move(scratch,
ExternalReference::Create(
IsolateAddressId::kPendingExceptionAddress, masm->isolate()));
}
__ str(r0, MemOperand(scratch));
__ LoadRoot(r0, RootIndex::kException);
__ b(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
// Must preserve r0-r4, r5-r6 are available.
__ PushStackHandler();
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the bl(&invoke) above, which
// restores all kCalleeSaved 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);
DCHECK_EQ(kPushedStackSpace, pushed_stack_space);
__ Call(trampoline_code, RelocInfo::CODE_TARGET);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit); // r0 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(r5);
__ cmp(r5, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ b(ne, &non_outermost_js_2);
__ mov(r6, Operand::Zero());
__ Move(r5, js_entry_sp);
__ str(r6, MemOperand(r5));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(r3);
__ Move(scratch, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ str(r3, MemOperand(scratch));
// Reset the stack to the callee saved registers.
__ add(sp, sp,
Operand(-EntryFrameConstants::kCallerFPOffset -
kSystemPointerSize /* already popped one */));
__ ldm(ia_w, sp, fp.bit() | lr.bit());
// Restore callee-saved vfp registers.
__ vldm(ia_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
__ ldm(ia_w, sp, kCalleeSavedWithoutFp);
__ mov(pc, lr);
// Emit constant pool.
__ CheckConstPool(true, false);
}
} // 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) {
// Called from Generate_JS_Entry
// r0: root_register_value
// r1: new.target
// r2: function
// r3: receiver
// [fp + kPushedStackSpace + 0 * kSystemPointerSize]: argc
// [fp + kPushedStackSpace + 1 * kSystemPointerSize]: argv
// r5-r6, r8 and cp may be clobbered
__ ldr(r0,
MemOperand(fp, kPushedStackSpace + EntryFrameConstants::kArgcOffset));
__ ldr(r4,
MemOperand(fp, kPushedStackSpace + EntryFrameConstants::kArgvOffset));
// r1: new.target
// r2: function
// r3: receiver
// r0: argc
// r4: 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());
__ Move(cp, context_address);
__ ldr(cp, MemOperand(cp));
// Push the function.
__ Push(r2);
// Check if we have enough stack space to push all arguments + receiver.
// Clobbers r5.
Label enough_stack_space, stack_overflow;
__ add(r6, r0, Operand(1)); // Add one for receiver.
__ StackOverflowCheck(r6, r5, &stack_overflow);
__ b(&enough_stack_space);
__ bind(&stack_overflow);
__ CallRuntime(Runtime::kThrowStackOverflow);
// Unreachable code.
__ bkpt(0);
__ bind(&enough_stack_space);
// Copy arguments to the stack in a loop.
// r1: new.target
// r2: function
// r3: receiver
// r0: argc
// r4: argv, i.e. points to first arg
Label loop, entry;
__ add(r6, r4, Operand(r0, LSL, kSystemPointerSizeLog2));
// r6 points past last arg.
__ b(&entry);
__ bind(&loop);
__ ldr(r5, MemOperand(r6, -kSystemPointerSize,
PreIndex)); // read next parameter
__ ldr(r5, MemOperand(r5)); // dereference handle
__ push(r5); // push parameter
__ bind(&entry);
__ cmp(r4, r6);
__ b(ne, &loop);
// Push the receiver.
__ Push(r3);
// Setup new.target and function.
__ mov(r3, r1);
__ mov(r1, r2);
// r0: argc
// r1: function
// r3: new.target
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(r4, RootIndex::kUndefinedValue);
__ mov(r2, r4);
__ mov(r5, r4);
__ mov(r6, r4);
__ mov(r8, r4);
if (kR9Available == 1) {
__ mov(r9, r4);
}
// Invoke the code.
Handle<Code> builtin = is_construct
? BUILTIN_CODE(masm->isolate(), Construct)
: masm->isolate()->builtins()->Call();
__ Call(builtin, RelocInfo::CODE_TARGET);
// Exit the JS frame and remove the parameters (except function), and
// return.
// Respect ABI stack constraint.
}
__ Jump(lr);
// r0: result
}
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.
// r0: root_register_value
// r1: microtask_queue
__ mov(RunMicrotasksDescriptor::MicrotaskQueueRegister(), r1);
__ 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.
__ str(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,
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, Operand(kPointerSizeLog2));
__ 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.
__ cmp(params_size, actual_params_size);
__ mov(params_size, actual_params_size, LeaveCC, lt);
// Leave the frame (also dropping the register file).
__ LeaveFrame(StackFrame::INTERPRETED);
// Drop receiver + arguments.
__ DropArguments(params_size, TurboAssembler::kCountIsBytes,
TurboAssembler::kCountIncludesReceiver);
}
// 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;
__ cmp_raw_immediate(actual_marker, expected_marker);
__ b(ne, &no_match);
GenerateTailCallToReturnedCode(masm, function_id);
__ bind(&no_match);
}
static void TailCallOptimizedCodeSlot(MacroAssembler* masm,
Register optimized_code_entry,
Register scratch) {
// ----------- S t a t e -------------
// -- r0 : actual argument count
// -- r3 : new target (preserved for callee if needed, and caller)
// -- r1 : target function (preserved for callee if needed, and caller)
// -----------------------------------
DCHECK(!AreAliased(r1, r3, optimized_code_entry, scratch));
Register closure = r1;
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.
__ ldr(scratch,
FieldMemOperand(optimized_code_entry, Code::kCodeDataContainerOffset));
__ ldr(scratch,
FieldMemOperand(scratch, CodeDataContainer::kKindSpecificFlagsOffset));
__ tst(scratch, Operand(1 << Code::kMarkedForDeoptimizationBit));
__ b(ne, &heal_optimized_code_slot);
// Optimized code is good, get it into the closure and link the closure
// into the optimized functions list, then tail call the optimized code.
ReplaceClosureCodeWithOptimizedCode(masm, optimized_code_entry, closure);
static_assert(kJavaScriptCallCodeStartRegister == r2, "ABI mismatch");
__ LoadCodeObjectEntry(r2, optimized_code_entry);
__ Jump(r2);
// 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 -------------
// -- r0 : actual argument count
// -- r3 : new target (preserved for callee if needed, and caller)
// -- r1 : 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.
// -----------------------------------
DCHECK(!AreAliased(feedback_vector, r1, r3, 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, 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 = scratch2;
DCHECK(!AreAliased(bytecode_array, bytecode_offset, bytecode_size_table,
bytecode, original_bytecode_offset));
__ Move(bytecode_size_table,
ExternalReference::bytecode_size_table_address());
__ Move(original_bytecode_offset, bytecode_offset);
// Check if the bytecode is a Wide or ExtraWide prefix bytecode.
Label process_bytecode;
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));
__ cmp(bytecode, Operand(0x3));
__ b(hi, &process_bytecode);
__ tst(bytecode, Operand(0x1));
// Load the next bytecode.
__ add(bytecode_offset, bytecode_offset, Operand(1));
__ ldrb(bytecode, MemOperand(bytecode_array, bytecode_offset));
// Update table to the wide scaled table.
__ add(bytecode_size_table, bytecode_size_table,
Operand(kByteSize * interpreter::Bytecodes::kBytecodeCount));
// Conditionally update table to the extra wide scaled table. We are taking
// advantage of the fact that the extra wide follows the wide one.
__ add(bytecode_size_table, bytecode_size_table,
Operand(kByteSize * interpreter::Bytecodes::kBytecodeCount), LeaveCC,
ne);
__ bind(&process_bytecode);
// Bailout to the return label if this is a return bytecode.
// Create cmp, cmpne, ..., cmpne to check for a return bytecode.
Condition flag = al;
#define JUMP_IF_EQUAL(NAME) \
__ cmp(bytecode, Operand(static_cast<int>(interpreter::Bytecode::k##NAME)), \
flag); \
flag = ne;
RETURN_BYTECODE_LIST(JUMP_IF_EQUAL)
#undef JUMP_IF_EQUAL
__ b(if_return, eq);
// If this is a JumpLoop, re-execute it to perform the jump to the beginning
// of the loop.
Label end, not_jump_loop;
__ cmp(bytecode, Operand(static_cast<int>(interpreter::Bytecode::kJumpLoop)));
__ b(ne, ¬_jump_loop);
// We need to restore the original bytecode_offset since we might have
// increased it to skip the wide / extra-wide prefix bytecode.
__ Move(bytecode_offset, original_bytecode_offset);
__ b(&end);
__ bind(¬_jump_loop);
// Otherwise, load the size of the current bytecode and advance the offset.
__ ldrb(scratch1, MemOperand(bytecode_size_table, bytecode));
__ add(bytecode_offset, bytecode_offset, scratch1);
__ bind(&end);
}