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cobalt / cobalt / ac9ac065c5083565917b15e7a672a79599f2f00b / . / src / v8 / src / arm64 / code-stubs-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-arguments.h"
#include "src/arm64/assembler-arm64-inl.h"
#include "src/arm64/macro-assembler-arm64-inl.h"
#include "src/bootstrapper.h"
#include "src/code-stubs.h"
#include "src/counters.h"
#include "src/frame-constants.h"
#include "src/frames.h"
#include "src/heap/heap-inl.h"
#include "src/ic/ic.h"
#include "src/ic/stub-cache.h"
#include "src/isolate.h"
#include "src/objects/regexp-match-info.h"
#include "src/regexp/jsregexp.h"
#include "src/regexp/regexp-macro-assembler.h"
#include "src/runtime/runtime.h"
#include "src/arm64/code-stubs-arm64.h" // Cannot be the first include.
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void ArrayNArgumentsConstructorStub::Generate(MacroAssembler* masm) {
__ Mov(x5, Operand(x0, LSL, kPointerSizeLog2));
__ Str(x1, MemOperand(__ StackPointer(), x5));
__ Push(x1, x2);
__ Add(x0, x0, Operand(3));
__ TailCallRuntime(Runtime::kNewArray);
}
void DoubleToIStub::Generate(MacroAssembler* masm) {
Label done;
Register result = destination();
DCHECK(result.Is64Bits());
UseScratchRegisterScope temps(masm);
Register scratch1 = temps.AcquireX();
Register scratch2 = temps.AcquireX();
DoubleRegister double_scratch = temps.AcquireD();
__ Peek(double_scratch, 0);
// Try to convert with a FPU convert instruction. This handles all
// non-saturating cases.
__ TryConvertDoubleToInt64(result, double_scratch, &done);
__ Fmov(result, double_scratch);
// If we reach here we need to manually convert the input to an int32.
// Extract the exponent.
Register exponent = scratch1;
__ Ubfx(exponent, result, HeapNumber::kMantissaBits,
HeapNumber::kExponentBits);
// It the exponent is >= 84 (kMantissaBits + 32), the result is always 0 since
// the mantissa gets shifted completely out of the int32_t result.
__ Cmp(exponent, HeapNumber::kExponentBias + HeapNumber::kMantissaBits + 32);
__ CzeroX(result, ge);
__ B(ge, &done);
// The Fcvtzs sequence handles all cases except where the conversion causes
// signed overflow in the int64_t target. Since we've already handled
// exponents >= 84, we can guarantee that 63 <= exponent < 84.
if (masm->emit_debug_code()) {
__ Cmp(exponent, HeapNumber::kExponentBias + 63);
// Exponents less than this should have been handled by the Fcvt case.
__ Check(ge, AbortReason::kUnexpectedValue);
}
// Isolate the mantissa bits, and set the implicit '1'.
Register mantissa = scratch2;
__ Ubfx(mantissa, result, 0, HeapNumber::kMantissaBits);
__ Orr(mantissa, mantissa, 1UL << HeapNumber::kMantissaBits);
// Negate the mantissa if necessary.
__ Tst(result, kXSignMask);
__ Cneg(mantissa, mantissa, ne);
// Shift the mantissa bits in the correct place. We know that we have to shift
// it left here, because exponent >= 63 >= kMantissaBits.
__ Sub(exponent, exponent,
HeapNumber::kExponentBias + HeapNumber::kMantissaBits);
__ Lsl(result, mantissa, exponent);
__ Bind(&done);
__ Ret();
}
void MathPowStub::Generate(MacroAssembler* masm) {
// Stack on entry:
// sp[0]: Exponent (as a tagged value).
// sp[1]: Base (as a tagged value).
//
// The (tagged) result will be returned in x0, as a heap number.
Register exponent_tagged = MathPowTaggedDescriptor::exponent();
DCHECK(exponent_tagged.is(x11));
Register exponent_integer = MathPowIntegerDescriptor::exponent();
DCHECK(exponent_integer.is(x12));
Register saved_lr = x19;
VRegister result_double = d0;
VRegister base_double = d0;
VRegister exponent_double = d1;
VRegister base_double_copy = d2;
VRegister scratch1_double = d6;
VRegister scratch0_double = d7;
// A fast-path for integer exponents.
Label exponent_is_smi, exponent_is_integer;
// Allocate a heap number for the result, and return it.
Label done;
// Unpack the inputs.
if (exponent_type() == TAGGED) {
__ JumpIfSmi(exponent_tagged, &exponent_is_smi);
__ Ldr(exponent_double,
FieldMemOperand(exponent_tagged, HeapNumber::kValueOffset));
}
// Handle double (heap number) exponents.
if (exponent_type() != INTEGER) {
// Detect integer exponents stored as doubles and handle those in the
// integer fast-path.
__ TryRepresentDoubleAsInt64(exponent_integer, exponent_double,
scratch0_double, &exponent_is_integer);
{
AllowExternalCallThatCantCauseGC scope(masm);
__ Mov(saved_lr, lr);
__ CallCFunction(
ExternalReference::power_double_double_function(isolate()), 0, 2);
__ Mov(lr, saved_lr);
__ B(&done);
}
// Handle SMI exponents.
__ Bind(&exponent_is_smi);
// x10 base_tagged The tagged base (input).
// x11 exponent_tagged The tagged exponent (input).
// d1 base_double The base as a double.
__ SmiUntag(exponent_integer, exponent_tagged);
}
__ Bind(&exponent_is_integer);
// x10 base_tagged The tagged base (input).
// x11 exponent_tagged The tagged exponent (input).
// x12 exponent_integer The exponent as an integer.
// d1 base_double The base as a double.
// Find abs(exponent). For negative exponents, we can find the inverse later.
Register exponent_abs = x13;
__ Cmp(exponent_integer, 0);
__ Cneg(exponent_abs, exponent_integer, mi);
// x13 exponent_abs The value of abs(exponent_integer).
// Repeatedly multiply to calculate the power.
// result = 1.0;
// For each bit n (exponent_integer{n}) {
// if (exponent_integer{n}) {
// result *= base;
// }
// base *= base;
// if (remaining bits in exponent_integer are all zero) {
// break;
// }
// }
Label power_loop, power_loop_entry, power_loop_exit;
__ Fmov(scratch1_double, base_double);
__ Fmov(base_double_copy, base_double);
__ Fmov(result_double, 1.0);
__ B(&power_loop_entry);
__ Bind(&power_loop);
__ Fmul(scratch1_double, scratch1_double, scratch1_double);
__ Lsr(exponent_abs, exponent_abs, 1);
__ Cbz(exponent_abs, &power_loop_exit);
__ Bind(&power_loop_entry);
__ Tbz(exponent_abs, 0, &power_loop);
__ Fmul(result_double, result_double, scratch1_double);
__ B(&power_loop);
__ Bind(&power_loop_exit);
// If the exponent was positive, result_double holds the result.
__ Tbz(exponent_integer, kXSignBit, &done);
// The exponent was negative, so find the inverse.
__ Fmov(scratch0_double, 1.0);
__ Fdiv(result_double, scratch0_double, result_double);
// ECMA-262 only requires Math.pow to return an 'implementation-dependent
// approximation' of base^exponent. However, mjsunit/math-pow uses Math.pow
// to calculate the subnormal value 2^-1074. This method of calculating
// negative powers doesn't work because 2^1074 overflows to infinity. To
// catch this corner-case, we bail out if the result was 0. (This can only
// occur if the divisor is infinity or the base is zero.)
__ Fcmp(result_double, 0.0);
__ B(&done, ne);
AllowExternalCallThatCantCauseGC scope(masm);
__ Mov(saved_lr, lr);
__ Fmov(base_double, base_double_copy);
__ Scvtf(exponent_double, exponent_integer);
__ CallCFunction(ExternalReference::power_double_double_function(isolate()),
0, 2);
__ Mov(lr, saved_lr);
__ Bind(&done);
__ Ret();
}
void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
// It is important that the following stubs are generated in this order
// because pregenerated stubs can only call other pregenerated stubs.
CEntryStub::GenerateAheadOfTime(isolate);
CommonArrayConstructorStub::GenerateStubsAheadOfTime(isolate);
StoreFastElementStub::GenerateAheadOfTime(isolate);
}
void CodeStub::GenerateFPStubs(Isolate* isolate) {
// Floating-point code doesn't get special handling in ARM64, so there's
// nothing to do here.
USE(isolate);
}
Movability CEntryStub::NeedsImmovableCode() {
// CEntryStub stores the return address on the stack before calling into
// C++ code. In some cases, the VM accesses this address, but it is not used
// when the C++ code returns to the stub because LR holds the return address
// in AAPCS64. If the stub is moved (perhaps during a GC), we could end up
// returning to dead code.
// TODO(jbramley): Whilst this is the only analysis that makes sense, I can't
// find any comment to confirm this, and I don't hit any crashes whatever
// this function returns. The anaylsis should be properly confirmed.
return kImmovable;
}
void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
CEntryStub stub(isolate, 1, kDontSaveFPRegs);
stub.GetCode();
CEntryStub stub_fp(isolate, 1, kSaveFPRegs);
stub_fp.GetCode();
}
void CEntryStub::Generate(MacroAssembler* masm) {
// The Abort mechanism relies on CallRuntime, which in turn relies on
// CEntryStub, so until this stub has been generated, we have to use a
// fall-back Abort mechanism.
//
// Note that this stub must be generated before any use of Abort.
MacroAssembler::NoUseRealAbortsScope no_use_real_aborts(masm);
ASM_LOCATION("CEntryStub::Generate entry");
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// Register parameters:
// x0: argc (including receiver, untagged)
// x1: target
// If argv_in_register():
// x11: argv (pointer to first argument)
//
// The stack on entry holds the arguments and the receiver, with the receiver
// at the highest address:
//
// sp]argc-1]: receiver
// sp[argc-2]: arg[argc-2]
// ... ...
// sp[1]: arg[1]
// sp[0]: arg[0]
//
// The arguments are in reverse order, so that arg[argc-2] is actually the
// first argument to the target function and arg[0] is the last.
const Register& argc_input = x0;
const Register& target_input = x1;
// Calculate argv, argc and the target address, and store them in
// callee-saved registers so we can retry the call without having to reload
// these arguments.
// TODO(jbramley): If the first call attempt succeeds in the common case (as
// it should), then we might be better off putting these parameters directly
// into their argument registers, rather than using callee-saved registers and
// preserving them on the stack.
const Register& argv = x21;
const Register& argc = x22;
const Register& target = x23;
// Derive argv from the stack pointer so that it points to the first argument
// (arg[argc-2]), or just below the receiver in case there are no arguments.
// - Adjust for the arg[] array.
Register temp_argv = x11;
if (!argv_in_register()) {
__ SlotAddress(temp_argv, x0);
// - Adjust for the receiver.
__ Sub(temp_argv, temp_argv, 1 * kPointerSize);
}
// Reserve three slots to preserve x21-x23 callee-saved registers.
int extra_stack_space = 3;
// Enter the exit frame.
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(
save_doubles(), x10, extra_stack_space,
is_builtin_exit() ? StackFrame::BUILTIN_EXIT : StackFrame::EXIT);
DCHECK(csp.Is(__ StackPointer()));
// Poke callee-saved registers into reserved space.
__ Poke(argv, 1 * kPointerSize);
__ Poke(argc, 2 * kPointerSize);
__ Poke(target, 3 * kPointerSize);
// We normally only keep tagged values in callee-saved registers, as they
// could be pushed onto the stack by called stubs and functions, and on the
// stack they can confuse the GC. However, we're only calling C functions
// which can push arbitrary data onto the stack anyway, and so the GC won't
// examine that part of the stack.
__ Mov(argc, argc_input);
__ Mov(target, target_input);
__ Mov(argv, temp_argv);
// x21 : argv
// x22 : argc
// x23 : call target
//
// The stack (on entry) holds the arguments and the receiver, with the
// receiver at the highest address:
//
// argv[8]: receiver
// argv -> argv[0]: arg[argc-2]
// ... ...
// argv[...]: arg[1]
// argv[...]: arg[0]
//
// Immediately below (after) this is the exit frame, as constructed by
// EnterExitFrame:
// fp[8]: CallerPC (lr)
// fp -> fp[0]: CallerFP (old fp)
// fp[-8]: Space reserved for SPOffset.
// fp[-16]: CodeObject()
// csp[...]: Saved doubles, if saved_doubles is true.
// csp[32]: Alignment padding, if necessary.
// csp[24]: Preserved x23 (used for target).
// csp[16]: Preserved x22 (used for argc).
// csp[8]: Preserved x21 (used for argv).
// csp -> csp[0]: Space reserved for the return address.
//
// After a successful call, the exit frame, preserved registers (x21-x23) and
// the arguments (including the receiver) are dropped or popped as
// appropriate. The stub then returns.
//
// After an unsuccessful call, the exit frame and suchlike are left
// untouched, and the stub either throws an exception by jumping to one of
// the exception_returned label.
DCHECK(csp.Is(__ StackPointer()));
// Prepare AAPCS64 arguments to pass to the builtin.
__ Mov(x0, argc);
__ Mov(x1, argv);
__ Mov(x2, ExternalReference::isolate_address(isolate()));
Label return_location;
__ Adr(x12, &return_location);
__ Poke(x12, 0);
if (__ emit_debug_code()) {
// Verify that the slot below fp[kSPOffset]-8 points to the return location
// (currently in x12).
UseScratchRegisterScope temps(masm);
Register temp = temps.AcquireX();
__ Ldr(temp, MemOperand(fp, ExitFrameConstants::kSPOffset));
__ Ldr(temp, MemOperand(temp, -static_cast<int64_t>(kXRegSize)));
__ Cmp(temp, x12);
__ Check(eq, AbortReason::kReturnAddressNotFoundInFrame);
}
// Call the builtin.
__ Blr(target);
__ Bind(&return_location);
// Result returned in x0 or x1:x0 - do not destroy these registers!
// x0 result0 The return code from the call.
// x1 result1 For calls which return ObjectPair.
// x21 argv
// x22 argc
// x23 target
const Register& result = x0;
// Check result for exception sentinel.
Label exception_returned;
__ CompareRoot(result, Heap::kExceptionRootIndex);
__ B(eq, &exception_returned);
// The call succeeded, so unwind the stack and return.
// Restore callee-saved registers x21-x23.
__ Mov(x11, argc);
__ Peek(argv, 1 * kPointerSize);
__ Peek(argc, 2 * kPointerSize);
__ Peek(target, 3 * kPointerSize);
__ LeaveExitFrame(save_doubles(), x10, x9);
if (!argv_in_register()) {
// Drop the remaining stack slots and return from the stub.
__ DropArguments(x11);
}
__ AssertFPCRState();
__ Ret();
// Handling of exception.
__ Bind(&exception_returned);
ExternalReference pending_handler_context_address(
IsolateAddressId::kPendingHandlerContextAddress, isolate());
ExternalReference pending_handler_entrypoint_address(
IsolateAddressId::kPendingHandlerEntrypointAddress, isolate());
ExternalReference pending_handler_fp_address(
IsolateAddressId::kPendingHandlerFPAddress, isolate());
ExternalReference pending_handler_sp_address(
IsolateAddressId::kPendingHandlerSPAddress, isolate());
// Ask the runtime for help to determine the handler. This will set x0 to
// contain the current pending exception, don't clobber it.
ExternalReference find_handler(Runtime::kUnwindAndFindExceptionHandler,
isolate());
DCHECK(csp.Is(masm->StackPointer()));
{
FrameScope scope(masm, StackFrame::MANUAL);
__ Mov(x0, 0); // argc.
__ Mov(x1, 0); // argv.
__ Mov(x2, ExternalReference::isolate_address(isolate()));
__ CallCFunction(find_handler, 3);
}
// Retrieve the handler context, SP and FP.
__ Mov(cp, Operand(pending_handler_context_address));
__ Ldr(cp, MemOperand(cp));
{
UseScratchRegisterScope temps(masm);
Register scratch = temps.AcquireX();
__ Mov(scratch, Operand(pending_handler_sp_address));
__ Ldr(scratch, MemOperand(scratch));
__ Mov(csp, scratch);
}
__ Mov(fp, Operand(pending_handler_fp_address));
__ Ldr(fp, MemOperand(fp));
// If the handler is a JS frame, restore the context to the frame. Note that
// the context will be set to (cp == 0) for non-JS frames.
Label not_js_frame;
__ Cbz(cp, &not_js_frame);
__ Str(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ Bind(&not_js_frame);
// Compute the handler entry address and jump to it.
__ Mov(x10, Operand(pending_handler_entrypoint_address));
__ Ldr(x10, MemOperand(x10));
__ Br(x10);
}
// This is the entry point from C++. 5 arguments are provided in x0-x4.
// See use of the JSEntryFunction for example in src/execution.cc.
// Input:
// x0: code entry.
// x1: function.
// x2: receiver.
// x3: argc.
// x4: argv.
// Output:
// x0: result.
void JSEntryStub::Generate(MacroAssembler* masm) {
Register code_entry = x0;
// Enable instruction instrumentation. This only works on the simulator, and
// will have no effect on the model or real hardware.
__ EnableInstrumentation();
Label invoke, handler_entry, exit;
__ PushCalleeSavedRegisters();
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// Set up the reserved register for 0.0.
__ Fmov(fp_zero, 0.0);
// Initialize the root array register
__ InitializeRootRegister();
// Build an entry frame (see layout below).
StackFrame::Type marker = type();
int64_t bad_frame_pointer = -1L; // Bad frame pointer to fail if it is used.
__ Mov(x13, bad_frame_pointer);
__ Mov(x12, StackFrame::TypeToMarker(marker));
__ Mov(x11, ExternalReference(IsolateAddressId::kCEntryFPAddress, isolate()));
__ Ldr(x10, MemOperand(x11));
__ Push(x13, x12, xzr, x10);
// Set up fp.
__ Sub(fp, __ StackPointer(), EntryFrameConstants::kCallerFPOffset);
// Push the JS entry frame marker. Also set js_entry_sp if this is the
// outermost JS call.
Label non_outermost_js, done;
ExternalReference js_entry_sp(IsolateAddressId::kJSEntrySPAddress, isolate());
__ Mov(x10, ExternalReference(js_entry_sp));
__ Ldr(x11, MemOperand(x10));
// 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.
__ Csel(x12, xzr, StackFrame::OUTERMOST_JSENTRY_FRAME, ne);
__ B(ne, &done);
__ Str(fp, MemOperand(x10));
__ Bind(&done);
__ Push(x12, padreg);
// The frame set up looks like this:
// sp[0] : padding.
// sp[1] : JS entry frame marker.
// sp[2] : C entry FP.
// sp[3] : stack frame marker.
// sp[4] : stack frame marker.
// sp[5] : bad frame pointer 0xFFF...FF <- fp points here.
// 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);
__ bind(&handler_entry);
handler_offset_ = 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 PushTryHandler below sets it to 0 to
// signal the existence of the JSEntry frame.
__ Mov(x10, Operand(ExternalReference(
IsolateAddressId::kPendingExceptionAddress, isolate())));
}
__ Str(code_entry, MemOperand(x10));
__ LoadRoot(x0, Heap::kExceptionRootIndex);
__ B(&exit);
// Invoke: Link this frame into the handler chain.
__ Bind(&invoke);
// Push new stack handler.
static_assert(StackHandlerConstants::kSize == 2 * kPointerSize,
"Unexpected offset for StackHandlerConstants::kSize");
static_assert(StackHandlerConstants::kNextOffset == 0 * kPointerSize,
"Unexpected offset for StackHandlerConstants::kNextOffset");
// Link the current handler as the next handler.
__ Mov(x11, ExternalReference(IsolateAddressId::kHandlerAddress, 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, __ StackPointer());
__ 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 the JS entry trampoline builtin.
// Notice that we cannot store a reference to the trampoline code directly in
// this stub, because runtime stubs are not traversed when doing GC.
// Expected registers by Builtins::JSEntryTrampoline
// x0: code entry.
// x1: function.
// x2: receiver.
// x3: argc.
// x4: argv.
__ Call(EntryTrampoline(), RelocInfo::CODE_TARGET);
// Pop the stack handler and unlink this frame from the handler chain.
static_assert(StackHandlerConstants::kNextOffset == 0 * kPointerSize,
"Unexpected offset for StackHandlerConstants::kNextOffset");
__ Pop(x10, padreg);
__ Mov(x11, ExternalReference(IsolateAddressId::kHandlerAddress, 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] : padding.
// sp[1] : JS entry frame marker.
// sp[2] : C entry FP.
// sp[3] : stack frame marker.
// sp[4] : stack frame marker.
// sp[5] : bad frame pointer 0xFFF...FF <- fp points here.
// 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, 1 * kPointerSize);
__ Cmp(x10, StackFrame::OUTERMOST_JSENTRY_FRAME);
__ B(ne, &non_outermost_js_2);
__ Mov(x12, ExternalReference(js_entry_sp));
__ Str(xzr, MemOperand(x12));
__ Bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ Mov(x12,
ExternalReference(IsolateAddressId::kCEntryFPAddress, isolate()));
__ Str(c_entry_fp, MemOperand(x12));
}
// Reset the stack to the callee saved registers.
static_assert(EntryFrameConstants::kFixedFrameSize % (2 * kPointerSize) == 0,
"Size of entry frame is not a multiple of 16 bytes");
__ Drop(EntryFrameConstants::kFixedFrameSize / kPointerSize);
// Restore the callee-saved registers and return.
__ PopCalleeSavedRegisters();
__ Ret();
}
// The entry hook is a Push (stp) instruction, followed by a call.
static const unsigned int kProfileEntryHookCallSize =
(1 * kInstructionSize) + Assembler::kCallSizeWithRelocation;
void ProfileEntryHookStub::MaybeCallEntryHookDelayed(TurboAssembler* tasm,
Zone* zone) {
if (tasm->isolate()->function_entry_hook() != nullptr) {
Assembler::BlockConstPoolScope no_const_pools(tasm);
DontEmitDebugCodeScope no_debug_code(tasm);
Label entry_hook_call_start;
tasm->Bind(&entry_hook_call_start);
tasm->Push(padreg, lr);
tasm->CallStubDelayed(new (zone) ProfileEntryHookStub(nullptr));
DCHECK_EQ(tasm->SizeOfCodeGeneratedSince(&entry_hook_call_start),
kProfileEntryHookCallSize);
tasm->Pop(lr, padreg);
}
}
void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
if (masm->isolate()->function_entry_hook() != nullptr) {
ProfileEntryHookStub stub(masm->isolate());
Assembler::BlockConstPoolScope no_const_pools(masm);
DontEmitDebugCodeScope no_debug_code(masm);
Label entry_hook_call_start;
__ Bind(&entry_hook_call_start);
__ Push(padreg, lr);
__ CallStub(&stub);
DCHECK_EQ(masm->SizeOfCodeGeneratedSince(&entry_hook_call_start),
kProfileEntryHookCallSize);
__ Pop(lr, padreg);
}
}
void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
MacroAssembler::NoUseRealAbortsScope no_use_real_aborts(masm);
// Save all kCallerSaved registers (including lr), since this can be called
// from anywhere.
// TODO(jbramley): What about FP registers?
__ PushCPURegList(kCallerSaved);
DCHECK(kCallerSaved.IncludesAliasOf(lr));
const int kNumSavedRegs = kCallerSaved.Count();
DCHECK_EQ(kNumSavedRegs % 2, 0);
// Compute the function's address as the first argument.
__ Sub(x0, lr, kProfileEntryHookCallSize);
#if V8_HOST_ARCH_ARM64
uintptr_t entry_hook =
reinterpret_cast<uintptr_t>(isolate()->function_entry_hook());
__ Mov(x10, entry_hook);
#else
// Under the simulator we need to indirect the entry hook through a trampoline
// function at a known address.
ApiFunction dispatcher(FUNCTION_ADDR(EntryHookTrampoline));
__ Mov(x10, Operand(ExternalReference(&dispatcher,
ExternalReference::BUILTIN_CALL,
isolate())));
// It additionally takes an isolate as a third parameter
__ Mov(x2, ExternalReference::isolate_address(isolate()));
#endif
// The caller's return address is above the saved temporaries.
// Grab its location for the second argument to the hook.
__ SlotAddress(x1, kNumSavedRegs);
{
// Create a dummy frame, as CallCFunction requires this.
FrameScope frame(masm, StackFrame::MANUAL);
__ CallCFunction(x10, 2, 0);
}
__ PopCPURegList(kCallerSaved);
__ Ret();
}
void DirectCEntryStub::Generate(MacroAssembler* masm) {
// Put return address on the stack (accessible to GC through exit frame pc).
__ Poke(lr, 0);
// Call the C++ function.
__ Blr(x10);
// Return to calling code.
__ Peek(lr, 0);
__ AssertFPCRState();
__ Ret();
}
void DirectCEntryStub::GenerateCall(MacroAssembler* masm,
Register target) {
// Make sure the caller configured the stack pointer (see comment in
// DirectCEntryStub::Generate).
DCHECK(csp.Is(__ StackPointer()));
intptr_t code =
reinterpret_cast<intptr_t>(GetCode().location());
__ Mov(lr, Operand(code, RelocInfo::CODE_TARGET));
__ Mov(x10, target);
// Branch to the stub.
__ Blr(lr);
}
template<class T>
static void CreateArrayDispatch(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
ASM_LOCATION("CreateArrayDispatch");
if (mode == DISABLE_ALLOCATION_SITES) {
T stub(masm->isolate(), GetInitialFastElementsKind(), mode);
__ TailCallStub(&stub);
} else if (mode == DONT_OVERRIDE) {
Register kind = x3;
int last_index =
GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= last_index; ++i) {
Label next;
ElementsKind candidate_kind = GetFastElementsKindFromSequenceIndex(i);
// TODO(jbramley): Is this the best way to handle this? Can we make the
// tail calls conditional, rather than hopping over each one?
__ CompareAndBranch(kind, candidate_kind, ne, &next);
T stub(masm->isolate(), candidate_kind);
__ TailCallStub(&stub);
__ Bind(&next);
}
// If we reached this point there is a problem.
__ Abort(AbortReason::kUnexpectedElementsKindInArrayConstructor);
} else {
UNREACHABLE();
}
}
// TODO(jbramley): If this needs to be a special case, make it a proper template
// specialization, and not a separate function.
static void CreateArrayDispatchOneArgument(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
ASM_LOCATION("CreateArrayDispatchOneArgument");
// x0 - argc
// x1 - constructor?
// x2 - allocation site (if mode != DISABLE_ALLOCATION_SITES)
// x3 - kind (if mode != DISABLE_ALLOCATION_SITES)
// sp[0] - last argument
Register allocation_site = x2;
Register kind = x3;
STATIC_ASSERT(PACKED_SMI_ELEMENTS == 0);
STATIC_ASSERT(HOLEY_SMI_ELEMENTS == 1);
STATIC_ASSERT(PACKED_ELEMENTS == 2);
STATIC_ASSERT(HOLEY_ELEMENTS == 3);
STATIC_ASSERT(PACKED_DOUBLE_ELEMENTS == 4);
STATIC_ASSERT(HOLEY_DOUBLE_ELEMENTS == 5);
if (mode == DISABLE_ALLOCATION_SITES) {
ElementsKind initial = GetInitialFastElementsKind();
ElementsKind holey_initial = GetHoleyElementsKind(initial);
ArraySingleArgumentConstructorStub stub_holey(masm->isolate(),
holey_initial,
DISABLE_ALLOCATION_SITES);
__ TailCallStub(&stub_holey);
} else if (mode == DONT_OVERRIDE) {
// Is the low bit set? If so, the array is holey.
Label normal_sequence;
__ Tbnz(kind, 0, &normal_sequence);
// We are going to create a holey array, but our kind is non-holey.
// Fix kind and retry (only if we have an allocation site in the slot).
__ Orr(kind, kind, 1);
if (FLAG_debug_code) {
__ Ldr(x10, FieldMemOperand(allocation_site, 0));
__ JumpIfNotRoot(x10, Heap::kAllocationSiteMapRootIndex,
&normal_sequence);
__ Assert(eq, AbortReason::kExpectedAllocationSite);
}
// Save the resulting elements kind in type info. We can't just store 'kind'
// in the AllocationSite::transition_info field because elements kind is
// restricted to a portion of the field; upper bits need to be left alone.
STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
__ Ldr(x11,
FieldMemOperand(allocation_site,
AllocationSite::kTransitionInfoOrBoilerplateOffset));
__ Add(x11, x11, Smi::FromInt(kFastElementsKindPackedToHoley));
__ Str(x11,
FieldMemOperand(allocation_site,
AllocationSite::kTransitionInfoOrBoilerplateOffset));
__ Bind(&normal_sequence);
int last_index =
GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= last_index; ++i) {
Label next;
ElementsKind candidate_kind = GetFastElementsKindFromSequenceIndex(i);
__ CompareAndBranch(kind, candidate_kind, ne, &next);
ArraySingleArgumentConstructorStub stub(masm->isolate(), candidate_kind);
__ TailCallStub(&stub);
__ Bind(&next);
}
// If we reached this point there is a problem.
__ Abort(AbortReason::kUnexpectedElementsKindInArrayConstructor);
} else {
UNREACHABLE();
}
}
template<class T>
static void ArrayConstructorStubAheadOfTimeHelper(Isolate* isolate) {
int to_index =
GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= to_index; ++i) {
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
T stub(isolate, kind);
stub.GetCode();
if (AllocationSite::ShouldTrack(kind)) {
T stub1(isolate, kind, DISABLE_ALLOCATION_SITES);
stub1.GetCode();
}
}
}
void CommonArrayConstructorStub::GenerateStubsAheadOfTime(Isolate* isolate) {
ArrayConstructorStubAheadOfTimeHelper<ArrayNoArgumentConstructorStub>(
isolate);
ArrayConstructorStubAheadOfTimeHelper<ArraySingleArgumentConstructorStub>(
isolate);
ArrayNArgumentsConstructorStub stub(isolate);
stub.GetCode();
ElementsKind kinds[2] = {PACKED_ELEMENTS, HOLEY_ELEMENTS};
for (int i = 0; i < 2; i++) {
// For internal arrays we only need a few things
InternalArrayNoArgumentConstructorStub stubh1(isolate, kinds[i]);
stubh1.GetCode();
InternalArraySingleArgumentConstructorStub stubh2(isolate, kinds[i]);
stubh2.GetCode();
}
}
void ArrayConstructorStub::GenerateDispatchToArrayStub(
MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
Register argc = x0;
Label zero_case, n_case;
__ Cbz(argc, &zero_case);
__ Cmp(argc, 1);
__ B(ne, &n_case);
// One argument.
CreateArrayDispatchOneArgument(masm, mode);
__ Bind(&zero_case);
// No arguments.
CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
__ Bind(&n_case);
// N arguments.
ArrayNArgumentsConstructorStub stub(masm->isolate());
__ TailCallStub(&stub);
}
void ArrayConstructorStub::Generate(MacroAssembler* masm) {
ASM_LOCATION("ArrayConstructorStub::Generate");
// ----------- S t a t e -------------
// -- x0 : argc (only if argument_count() is ANY or MORE_THAN_ONE)
// -- x1 : constructor
// -- x2 : AllocationSite or undefined
// -- x3 : new target
// -- sp[0] : last argument
// -----------------------------------
Register constructor = x1;
Register allocation_site = x2;
Register new_target = x3;
if (FLAG_debug_code) {
// The array construct code is only set for the global and natives
// builtin Array functions which always have maps.
Label unexpected_map, map_ok;
// Initial map for the builtin Array function should be a map.
__ Ldr(x10, FieldMemOperand(constructor,
JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a nullptr and a Smi.
__ JumpIfSmi(x10, &unexpected_map);
__ JumpIfObjectType(x10, x10, x11, MAP_TYPE, &map_ok);
__ Bind(&unexpected_map);
__ Abort(AbortReason::kUnexpectedInitialMapForArrayFunction);
__ Bind(&map_ok);
// We should either have undefined in the allocation_site register or a
// valid AllocationSite.
__ AssertUndefinedOrAllocationSite(allocation_site);
}
// Enter the context of the Array function.
__ Ldr(cp, FieldMemOperand(x1, JSFunction::kContextOffset));
Label subclassing;
__ Cmp(new_target, constructor);
__ B(ne, &subclassing);
Register kind = x3;
Label no_info;
// Get the elements kind and case on that.
__ JumpIfRoot(allocation_site, Heap::kUndefinedValueRootIndex, &no_info);
__ Ldrsw(kind, UntagSmiFieldMemOperand(
allocation_site,
AllocationSite::kTransitionInfoOrBoilerplateOffset));
__ And(kind, kind, AllocationSite::ElementsKindBits::kMask);
GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
__ Bind(&no_info);
GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
// Subclassing support.
__ Bind(&subclassing);
__ Poke(constructor, Operand(x0, LSL, kPointerSizeLog2));
__ Add(x0, x0, Operand(3));
__ Push(new_target, allocation_site);
__ JumpToExternalReference(ExternalReference(Runtime::kNewArray, isolate()));
}
void InternalArrayConstructorStub::GenerateCase(
MacroAssembler* masm, ElementsKind kind) {
Label zero_case, n_case;
Register argc = x0;
__ Cbz(argc, &zero_case);
__ CompareAndBranch(argc, 1, ne, &n_case);
// One argument.
if (IsFastPackedElementsKind(kind)) {
Label packed_case;
// We might need to create a holey array; look at the first argument.
__ Peek(x10, 0);
__ Cbz(x10, &packed_case);
InternalArraySingleArgumentConstructorStub
stub1_holey(isolate(), GetHoleyElementsKind(kind));
__ TailCallStub(&stub1_holey);
__ Bind(&packed_case);
}
InternalArraySingleArgumentConstructorStub stub1(isolate(), kind);
__ TailCallStub(&stub1);
__ Bind(&zero_case);
// No arguments.
InternalArrayNoArgumentConstructorStub stub0(isolate(), kind);
__ TailCallStub(&stub0);
__ Bind(&n_case);
// N arguments.
ArrayNArgumentsConstructorStub stubN(isolate());
__ TailCallStub(&stubN);
}
void InternalArrayConstructorStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : argc
// -- x1 : constructor
// -- sp[0] : return address
// -- sp[4] : last argument
// -----------------------------------
Register constructor = x1;
if (FLAG_debug_code) {
// The array construct code is only set for the global and natives
// builtin Array functions which always have maps.
Label unexpected_map, map_ok;
// Initial map for the builtin Array function should be a map.
__ Ldr(x10, FieldMemOperand(constructor,
JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a nullptr and a Smi.
__ JumpIfSmi(x10, &unexpected_map);
__ JumpIfObjectType(x10, x10, x11, MAP_TYPE, &map_ok);
__ Bind(&unexpected_map);
__ Abort(AbortReason::kUnexpectedInitialMapForArrayFunction);
__ Bind(&map_ok);
}
Register kind = w3;
// Figure out the right elements kind
__ Ldr(x10, FieldMemOperand(constructor,
JSFunction::kPrototypeOrInitialMapOffset));
// Retrieve elements_kind from map.
__ LoadElementsKindFromMap(kind, x10);
if (FLAG_debug_code) {
Label done;
__ Cmp(x3, PACKED_ELEMENTS);
__ Ccmp(x3, HOLEY_ELEMENTS, ZFlag, ne);
__ Assert(
eq,
AbortReason::kInvalidElementsKindForInternalArrayOrInternalPackedArray);
}
Label fast_elements_case;
__ CompareAndBranch(kind, PACKED_ELEMENTS, eq, &fast_elements_case);
GenerateCase(masm, HOLEY_ELEMENTS);
__ Bind(&fast_elements_case);
GenerateCase(masm, PACKED_ELEMENTS);
}
// The number of register that CallApiFunctionAndReturn will need to save on
// the stack. The space for these registers need to be allocated in the
// ExitFrame before calling CallApiFunctionAndReturn.
static const int kCallApiFunctionSpillSpace = 4;
static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
return static_cast<int>(ref0.address() - ref1.address());
}
// Calls an API function. Allocates HandleScope, extracts returned value
// from handle and propagates exceptions.
// 'stack_space' is the space to be unwound on exit (includes the call JS
// arguments space and the additional space allocated for the fast call).
// 'spill_offset' is the offset from the stack pointer where
// CallApiFunctionAndReturn can spill registers.
static void CallApiFunctionAndReturn(MacroAssembler* masm,
Register function_address,
ExternalReference thunk_ref,
int stack_space, int spill_offset,
MemOperand return_value_operand) {
ASM_LOCATION("CallApiFunctionAndReturn");
Isolate* isolate = masm->isolate();
ExternalReference next_address =
ExternalReference::handle_scope_next_address(isolate);
const int kNextOffset = 0;
const int kLimitOffset = AddressOffset(
ExternalReference::handle_scope_limit_address(isolate), next_address);
const int kLevelOffset = AddressOffset(
ExternalReference::handle_scope_level_address(isolate), next_address);
DCHECK(function_address.is(x1) || function_address.is(x2));
Label profiler_disabled;
Label end_profiler_check;
__ Mov(x10, ExternalReference::is_profiling_address(isolate));
__ Ldrb(w10, MemOperand(x10));
__ Cbz(w10, &profiler_disabled);
__ Mov(x3, thunk_ref);
__ B(&end_profiler_check);
__ Bind(&profiler_disabled);
__ Mov(x3, function_address);
__ Bind(&end_profiler_check);
// Save the callee-save registers we are going to use.
// TODO(all): Is this necessary? ARM doesn't do it.
STATIC_ASSERT(kCallApiFunctionSpillSpace == 4);
__ Poke(x19, (spill_offset + 0) * kXRegSize);
__ Poke(x20, (spill_offset + 1) * kXRegSize);
__ Poke(x21, (spill_offset + 2) * kXRegSize);
__ Poke(x22, (spill_offset + 3) * kXRegSize);
// Allocate HandleScope in callee-save registers.
// We will need to restore the HandleScope after the call to the API function,
// by allocating it in callee-save registers they will be preserved by C code.
Register handle_scope_base = x22;
Register next_address_reg = x19;
Register limit_reg = x20;
Register level_reg = w21;
__ Mov(handle_scope_base, next_address);
__ Ldr(next_address_reg, MemOperand(handle_scope_base, kNextOffset));
__ Ldr(limit_reg, MemOperand(handle_scope_base, kLimitOffset));
__ Ldr(level_reg, MemOperand(handle_scope_base, kLevelOffset));
__ Add(level_reg, level_reg, 1);
__ Str(level_reg, MemOperand(handle_scope_base, kLevelOffset));
if (FLAG_log_timer_events) {
FrameScope frame(masm, StackFrame::MANUAL);
__ PushSafepointRegisters();
__ Mov(x0, ExternalReference::isolate_address(isolate));
__ CallCFunction(ExternalReference::log_enter_external_function(isolate),
1);
__ PopSafepointRegisters();
}
// Native call returns to the DirectCEntry stub which redirects to the
// return address pushed on stack (could have moved after GC).
// DirectCEntry stub itself is generated early and never moves.
DirectCEntryStub stub(isolate);
stub.GenerateCall(masm, x3);
if (FLAG_log_timer_events) {
FrameScope frame(masm, StackFrame::MANUAL);
__ PushSafepointRegisters();
__ Mov(x0, ExternalReference::isolate_address(isolate));
__ CallCFunction(ExternalReference::log_leave_external_function(isolate),
1);
__ PopSafepointRegisters();
}
Label promote_scheduled_exception;
Label delete_allocated_handles;
Label leave_exit_frame;
Label return_value_loaded;
// Load value from ReturnValue.
__ Ldr(x0, return_value_operand);
__ Bind(&return_value_loaded);
// No more valid handles (the result handle was the last one). Restore
// previous handle scope.
__ Str(next_address_reg, MemOperand(handle_scope_base, kNextOffset));
if (__ emit_debug_code()) {
__ Ldr(w1, MemOperand(handle_scope_base, kLevelOffset));
__ Cmp(w1, level_reg);
__ Check(eq, AbortReason::kUnexpectedLevelAfterReturnFromApiCall);
}
__ Sub(level_reg, level_reg, 1);
__ Str(level_reg, MemOperand(handle_scope_base, kLevelOffset));
__ Ldr(x1, MemOperand(handle_scope_base, kLimitOffset));
__ Cmp(limit_reg, x1);
__ B(ne, &delete_allocated_handles);
// Leave the API exit frame.
__ Bind(&leave_exit_frame);
// Restore callee-saved registers.
__ Peek(x19, (spill_offset + 0) * kXRegSize);
__ Peek(x20, (spill_offset + 1) * kXRegSize);
__ Peek(x21, (spill_offset + 2) * kXRegSize);
__ Peek(x22, (spill_offset + 3) * kXRegSize);
__ LeaveExitFrame(false, x1, x5);
// Check if the function scheduled an exception.
__ Mov(x5, ExternalReference::scheduled_exception_address(isolate));
__ Ldr(x5, MemOperand(x5));
__ JumpIfNotRoot(x5, Heap::kTheHoleValueRootIndex,
&promote_scheduled_exception);
__ DropSlots(stack_space);
__ Ret();
// Re-throw by promoting a scheduled exception.
__ Bind(&promote_scheduled_exception);
__ TailCallRuntime(Runtime::kPromoteScheduledException);
// HandleScope limit has changed. Delete allocated extensions.
__ Bind(&delete_allocated_handles);
__ Str(limit_reg, MemOperand(handle_scope_base, kLimitOffset));
// Save the return value in a callee-save register.
Register saved_result = x19;
__ Mov(saved_result, x0);
__ Mov(x0, ExternalReference::isolate_address(isolate));
__ CallCFunction(ExternalReference::delete_handle_scope_extensions(isolate),
1);
__ Mov(x0, saved_result);
__ B(&leave_exit_frame);
}
void CallApiCallbackStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x4 : call_data
// -- x2 : holder
// -- x1 : api_function_address
// -- cp : context
// --
// -- sp[0] : last argument
// -- ...
// -- sp[(argc - 1) * 8] : first argument
// -- sp[argc * 8] : receiver
// -----------------------------------
Register call_data = x4;
Register holder = x2;
Register api_function_address = x1;
typedef FunctionCallbackArguments FCA;
STATIC_ASSERT(FCA::kArgsLength == 6);
STATIC_ASSERT(FCA::kNewTargetIndex == 5);
STATIC_ASSERT(FCA::kDataIndex == 4);
STATIC_ASSERT(FCA::kReturnValueOffset == 3);
STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
STATIC_ASSERT(FCA::kIsolateIndex == 1);
STATIC_ASSERT(FCA::kHolderIndex == 0);
Register undef = x7;
__ LoadRoot(undef, Heap::kUndefinedValueRootIndex);
// Push new target, call data.
__ Push(undef, call_data);
Register isolate_reg = x5;
__ Mov(isolate_reg, ExternalReference::isolate_address(masm->isolate()));
// FunctionCallbackArguments:
// return value, return value default, isolate, holder.
__ Push(undef, undef, isolate_reg, holder);
// Prepare arguments.
Register args = x6;
__ Mov(args, masm->StackPointer());
// Allocate the v8::Arguments structure in the arguments' space, since it's
// not controlled by GC.
const int kApiStackSpace = 3;
// Allocate space so that CallApiFunctionAndReturn can store some scratch
// registers on the stack.
const int kCallApiFunctionSpillSpace = 4;
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(false, x10, kApiStackSpace + kCallApiFunctionSpillSpace);
DCHECK(!AreAliased(x0, api_function_address));
// x0 = FunctionCallbackInfo&
// Arguments is after the return address.
__ SlotAddress(x0, 1);
// FunctionCallbackInfo::implicit_args_ and FunctionCallbackInfo::values_
__ Add(x10, args, Operand((FCA::kArgsLength - 1 + argc()) * kPointerSize));
__ Stp(args, x10, MemOperand(x0, 0 * kPointerSize));
// FunctionCallbackInfo::length_ = argc
__ Mov(x10, argc());
__ Str(x10, MemOperand(x0, 2 * kPointerSize));
ExternalReference thunk_ref =
ExternalReference::invoke_function_callback(masm->isolate());
AllowExternalCallThatCantCauseGC scope(masm);
// Stores return the first js argument
int return_value_offset = 2 + FCA::kReturnValueOffset;
MemOperand return_value_operand(fp, return_value_offset * kPointerSize);
// The number of arguments might be odd, but will be padded when calling the
// stub. We do not round up stack_space to account for odd argc here, this
// will be done in CallApiFunctionAndReturn.
const int stack_space = (argc() + 1) + FCA::kArgsLength;
// The current frame needs to be aligned.
DCHECK_EQ((stack_space - (argc() + 1)) % 2, 0);
const int spill_offset = 1 + kApiStackSpace;
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, stack_space,
spill_offset, return_value_operand);
}
void CallApiGetterStub::Generate(MacroAssembler* masm) {
STATIC_ASSERT(PropertyCallbackArguments::kShouldThrowOnErrorIndex == 0);
STATIC_ASSERT(PropertyCallbackArguments::kHolderIndex == 1);
STATIC_ASSERT(PropertyCallbackArguments::kIsolateIndex == 2);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueDefaultValueIndex == 3);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueOffset == 4);
STATIC_ASSERT(PropertyCallbackArguments::kDataIndex == 5);
STATIC_ASSERT(PropertyCallbackArguments::kThisIndex == 6);
STATIC_ASSERT(PropertyCallbackArguments::kArgsLength == 7);
Register receiver = ApiGetterDescriptor::ReceiverRegister();
Register holder = ApiGetterDescriptor::HolderRegister();
Register callback = ApiGetterDescriptor::CallbackRegister();
Register data = x4;
Register undef = x5;
Register isolate_address = x6;
Register name = x7;
DCHECK(!AreAliased(receiver, holder, callback, data, undef, isolate_address,
name));
__ Ldr(data, FieldMemOperand(callback, AccessorInfo::kDataOffset));
__ LoadRoot(undef, Heap::kUndefinedValueRootIndex);
__ Mov(isolate_address,
Operand(ExternalReference::isolate_address(isolate())));
__ Ldr(name, FieldMemOperand(callback, AccessorInfo::kNameOffset));
// PropertyCallbackArguments:
// receiver, data, return value, return value default, isolate, holder,
// should_throw_on_error
// These are followed by the property name, which is also pushed below the
// exit frame to make the GC aware of it.
__ Push(receiver, data, undef, undef, isolate_address, holder, xzr, name);
// v8::PropertyCallbackInfo::args_ array and name handle.
static const int kStackUnwindSpace =
PropertyCallbackArguments::kArgsLength + 1;
static_assert(kStackUnwindSpace % 2 == 0,
"slots must be a multiple of 2 for stack pointer alignment");
// Load address of v8::PropertyAccessorInfo::args_ array and name handle.
__ Mov(x0, masm->StackPointer()); // x0 = Handle<Name>
__ Add(x1, x0, 1 * kPointerSize); // x1 = v8::PCI::args_
const int kApiStackSpace = 1;
// Allocate space so that CallApiFunctionAndReturn can store some scratch
// registers on the stack.
const int kCallApiFunctionSpillSpace = 4;
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(false, x10, kApiStackSpace + kCallApiFunctionSpillSpace);
// Create v8::PropertyCallbackInfo object on the stack and initialize
// it's args_ field.
__ Poke(x1, 1 * kPointerSize);
__ SlotAddress(x1, 1);
// x1 = v8::PropertyCallbackInfo&
ExternalReference thunk_ref =
ExternalReference::invoke_accessor_getter_callback(isolate());
Register api_function_address = x2;
Register js_getter = x4;
__ Ldr(js_getter, FieldMemOperand(callback, AccessorInfo::kJsGetterOffset));
__ Ldr(api_function_address,
FieldMemOperand(js_getter, Foreign::kForeignAddressOffset));
const int spill_offset = 1 + kApiStackSpace;
// +3 is to skip prolog, return address and name handle.
MemOperand return_value_operand(
fp, (PropertyCallbackArguments::kReturnValueOffset + 3) * kPointerSize);
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
kStackUnwindSpace, spill_offset,
return_value_operand);
}
#undef __
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_ARM64