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builtins-ppc.cc
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builtins-ppc.cc
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// Copyright 2014 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_PPC
#include "src/api/api-arguments.h"
#include "src/codegen/code-factory.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/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/smi.h"
#include "src/runtime/runtime.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm, Address address) {
__ Move(kJavaScriptCallExtraArg1Register, ExternalReference::Create(address));
__ Jump(BUILTIN_CODE(masm->isolate(), AdaptorWithBuiltinExitFrame),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_InternalArrayConstructor(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : number of arguments
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
if (FLAG_debug_code) {
// Initial map for the builtin InternalArray functions should be maps.
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kPrototypeOrInitialMapOffset));
__ TestIfSmi(r5, r0);
__ Assert(ne, AbortReason::kUnexpectedInitialMapForInternalArrayFunction,
cr0);
__ CompareObjectType(r5, r6, r7, MAP_TYPE);
__ Assert(eq, AbortReason::kUnexpectedInitialMapForInternalArrayFunction);
}
// Run the native code for the InternalArray function called as a normal
// function.
__ Jump(BUILTIN_CODE(masm->isolate(), InternalArrayConstructorImpl),
RelocInfo::CODE_TARGET);
}
static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
Runtime::FunctionId function_id) {
// ----------- S t a t e -------------
// -- r4 : target function (preserved for callee)
// -- r6 : new target (preserved for callee)
// -----------------------------------
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
// Push a copy of the target function and the new target.
// Push function as parameter to the runtime call.
__ Push(r4, r6, r4);
__ CallRuntime(function_id, 1);
__ mr(r5, r3);
// Restore target function and new target.
__ Pop(r4, r6);
}
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ JumpCodeObject(r5);
}
namespace {
void LoadRealStackLimit(MacroAssembler* masm, Register destination) {
DCHECK(masm->root_array_available());
Isolate* isolate = masm->isolate();
ExternalReference limit = ExternalReference::address_of_real_jslimit(isolate);
DCHECK(TurboAssembler::IsAddressableThroughRootRegister(isolate, limit));
intptr_t offset =
TurboAssembler::RootRegisterOffsetForExternalReference(isolate, limit);
CHECK(is_int32(offset));
__ LoadP(destination, MemOperand(kRootRegister, offset), r0);
}
void Generate_StackOverflowCheck(MacroAssembler* masm, Register num_args,
Register scratch, Label* stack_overflow) {
// 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.
LoadRealStackLimit(masm, scratch);
// Make scratch the space we have left. The stack might already be overflowed
// here which will cause scratch to become negative.
__ sub(scratch, sp, scratch);
// Check if the arguments will overflow the stack.
__ ShiftLeftImm(r0, num_args, Operand(kPointerSizeLog2));
__ cmp(scratch, r0);
__ ble(stack_overflow); // Signed comparison.
}
void Generate_JSBuiltinsConstructStubHelper(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : number of arguments
// -- r4 : constructor function
// -- r6 : new target
// -- cp : context
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Register scratch = r5;
Label stack_overflow;
Generate_StackOverflowCheck(masm, r3, r8, &stack_overflow);
// Enter a construct frame.
{
FrameAndConstantPoolScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ SmiTag(r3);
__ Push(cp, r3);
__ SmiUntag(r3, SetRC);
// The receiver for the builtin/api call.
__ PushRoot(RootIndex::kTheHoleValue);
// Set up pointer to last argument.
__ addi(r7, fp, Operand(StandardFrameConstants::kCallerSPOffset));
// Copy arguments and receiver to the expression stack.
Label loop, no_args;
// ----------- S t a t e -------------
// -- r3: number of arguments (untagged)
// -- r4: constructor function
// -- r6: new target
// -- r7: pointer to last argument
// -- cr0: condition indicating whether r3 is zero
// -- sp[0*kPointerSize]: the hole (receiver)
// -- sp[1*kPointerSize]: number of arguments (tagged)
// -- sp[2*kPointerSize]: context
// -----------------------------------
__ beq(&no_args, cr0);
__ ShiftLeftImm(scratch, r3, Operand(kPointerSizeLog2));
__ sub(sp, sp, scratch);
__ mtctr(r3);
__ bind(&loop);
__ subi(scratch, scratch, Operand(kPointerSize));
__ LoadPX(r0, MemOperand(r7, scratch));
__ StorePX(r0, MemOperand(sp, scratch));
__ bdnz(&loop);
__ bind(&no_args);
// Call the function.
// r3: number of arguments (untagged)
// r4: constructor function
// r6: new target
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm);
ParameterCount actual(r3);
__ InvokeFunction(r4, r6, actual, CALL_FUNCTION);
}
// Restore context from the frame.
__ LoadP(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// Restore smi-tagged arguments count from the frame.
__ LoadP(r4, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
__ SmiToPtrArrayOffset(r4, r4);
__ add(sp, sp, r4);
__ addi(sp, sp, Operand(kPointerSize));
__ blr();
__ 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 -------------
// -- r3: number of arguments (untagged)
// -- r4: constructor function
// -- r6: new target
// -- cp: context
// -- lr: return address
// -- sp[...]: constructor arguments
// -----------------------------------
// Enter a construct frame.
{
FrameAndConstantPoolScope scope(masm, StackFrame::CONSTRUCT);
Label post_instantiation_deopt_entry, not_create_implicit_receiver;
// Preserve the incoming parameters on the stack.
__ SmiTag(r3);
__ Push(cp, r3, r4);
__ PushRoot(RootIndex::kUndefinedValue);
__ Push(r6);
// ----------- S t a t e -------------
// -- sp[0*kPointerSize]: new target
// -- sp[1*kPointerSize]: padding
// -- r4 and sp[2*kPointerSize]: constructor function
// -- sp[3*kPointerSize]: number of arguments (tagged)
// -- sp[4*kPointerSize]: context
// -----------------------------------
__ LoadP(r7, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ lwz(r7, FieldMemOperand(r7, SharedFunctionInfo::kFlagsOffset));
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(r7);
__ JumpIfIsInRange(r7, kDefaultDerivedConstructor, kDerivedConstructor,
¬_create_implicit_receiver);
// If not derived class constructor: Allocate the new receiver object.
__ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1,
r7, r8);
__ 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(r3, RootIndex::kTheHoleValue);
// ----------- S t a t e -------------
// -- r3: receiver
// -- Slot 4 / sp[0*kPointerSize]: new target
// -- Slot 3 / sp[1*kPointerSize]: padding
// -- Slot 2 / sp[2*kPointerSize]: constructor function
// -- Slot 1 / sp[3*kPointerSize]: number of arguments (tagged)
// -- Slot 0 / sp[4*kPointerSize]: context
// -----------------------------------
// Deoptimizer enters here.
masm->isolate()->heap()->SetConstructStubCreateDeoptPCOffset(
masm->pc_offset());
__ bind(&post_instantiation_deopt_entry);
// Restore new target.
__ Pop(r6);
// Push the allocated receiver to the stack. 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.
__ Push(r3, r3);
// ----------- S t a t e -------------
// -- r6: new target
// -- sp[0*kPointerSize]: implicit receiver
// -- sp[1*kPointerSize]: implicit receiver
// -- sp[2*kPointerSize]: padding
// -- sp[3*kPointerSize]: constructor function
// -- sp[4*kPointerSize]: number of arguments (tagged)
// -- sp[5*kPointerSize]: context
// -----------------------------------
// Restore constructor function and argument count.
__ LoadP(r4, MemOperand(fp, ConstructFrameConstants::kConstructorOffset));
__ LoadP(r3, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
__ SmiUntag(r3);
// Set up pointer to last argument.
__ addi(r7, fp, Operand(StandardFrameConstants::kCallerSPOffset));
Label enough_stack_space, stack_overflow;
Generate_StackOverflowCheck(masm, r3, r8, &stack_overflow);
__ b(&enough_stack_space);
__ bind(&stack_overflow);
// Restore the context from the frame.
__ LoadP(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowStackOverflow);
// Unreachable code.
__ bkpt(0);
__ bind(&enough_stack_space);
// Copy arguments and receiver to the expression stack.
Label loop, no_args;
// ----------- S t a t e -------------
// -- r3: number of arguments (untagged)
// -- r6: new target
// -- r7: pointer to last argument
// -- cr0: condition indicating whether r3 is zero
// -- sp[0*kPointerSize]: implicit receiver
// -- sp[1*kPointerSize]: implicit receiver
// -- sp[2*kPointerSize]: padding
// -- r4 and sp[3*kPointerSize]: constructor function
// -- sp[4*kPointerSize]: number of arguments (tagged)
// -- sp[5*kPointerSize]: context
// -----------------------------------
__ cmpi(r3, Operand::Zero());
__ beq(&no_args);
__ ShiftLeftImm(r9, r3, Operand(kPointerSizeLog2));
__ sub(sp, sp, r9);
__ mtctr(r3);
__ bind(&loop);
__ subi(r9, r9, Operand(kPointerSize));
__ LoadPX(r0, MemOperand(r7, r9));
__ StorePX(r0, MemOperand(sp, r9));
__ bdnz(&loop);
__ bind(&no_args);
// Call the function.
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm);
ParameterCount actual(r3);
__ InvokeFunction(r4, r6, actual, CALL_FUNCTION);
}
// ----------- 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());
// Restore the context from the frame.
__ LoadP(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_frame;
// If the result is undefined, we jump out to using the implicit receiver.
__ JumpIfRoot(r3, RootIndex::kUndefinedValue, &use_receiver);
// Otherwise we do a smi check and fall through to check if the return value
// is a valid receiver.
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(r3, &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(r3, r7, r7, FIRST_JS_RECEIVER_TYPE);
__ bge(&leave_frame);
__ b(&use_receiver);
__ bind(&do_throw);
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ LoadP(r3, MemOperand(sp));
__ JumpIfRoot(r3, RootIndex::kTheHoleValue, &do_throw);
__ bind(&leave_frame);
// Restore smi-tagged arguments count from the frame.
__ LoadP(r4, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
__ SmiToPtrArrayOffset(r4, r4);
__ add(sp, sp, r4);
__ addi(sp, sp, Operand(kPointerSize));
__ blr();
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSBuiltinsConstructStubHelper(masm);
}
static void GetSharedFunctionInfoBytecode(MacroAssembler* masm,
Register sfi_data,
Register scratch1) {
Label done;
__ CompareObjectType(sfi_data, scratch1, scratch1, INTERPRETER_DATA_TYPE);
__ bne(&done);
__ LoadP(sfi_data,
FieldMemOperand(sfi_data, InterpreterData::kBytecodeArrayOffset));
__ bind(&done);
}
// static
void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : the value to pass to the generator
// -- r4 : the JSGeneratorObject to resume
// -- lr : return address
// -----------------------------------
__ AssertGeneratorObject(r4);
// Store input value into generator object.
__ StoreP(r3, FieldMemOperand(r4, JSGeneratorObject::kInputOrDebugPosOffset),
r0);
__ RecordWriteField(r4, JSGeneratorObject::kInputOrDebugPosOffset, r3, r6,
kLRHasNotBeenSaved, kDontSaveFPRegs);
// Load suspended function and context.
__ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
__ LoadP(cp, FieldMemOperand(r7, JSFunction::kContextOffset));
// Flood function if we are stepping.
Label prepare_step_in_if_stepping, prepare_step_in_suspended_generator;
Label stepping_prepared;
Register scratch = r8;
ExternalReference debug_hook =
ExternalReference::debug_hook_on_function_call_address(masm->isolate());
__ Move(scratch, debug_hook);
__ LoadByte(scratch, MemOperand(scratch), r0);
__ extsb(scratch, scratch);
__ CmpSmiLiteral(scratch, Smi::zero(), r0);
__ bne(&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);
__ LoadP(scratch, MemOperand(scratch));
__ cmp(scratch, r4);
__ beq(&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;
LoadRealStackLimit(masm, scratch);
__ cmpl(sp, scratch);
__ blt(&stack_overflow);
// Push receiver.
__ LoadP(scratch, FieldMemOperand(r4, JSGeneratorObject::kReceiverOffset));
__ Push(scratch);
// ----------- S t a t e -------------
// -- r4 : the JSGeneratorObject to resume
// -- r7 : generator function
// -- cp : generator context
// -- lr : return address
// -- sp[0] : generator receiver
// -----------------------------------
// Copy the function arguments from the generator object's register file.
__ LoadP(r6, FieldMemOperand(r7, JSFunction::kSharedFunctionInfoOffset));
__ LoadHalfWord(
r6, FieldMemOperand(r6, SharedFunctionInfo::kFormalParameterCountOffset));
__ LoadP(r5, FieldMemOperand(
r4, JSGeneratorObject::kParametersAndRegistersOffset));
{
Label loop, done_loop;
__ cmpi(r6, Operand::Zero());
__ ble(&done_loop);
// setup r9 to first element address - kPointerSize
__ addi(r9, r5,
Operand(FixedArray::kHeaderSize - kHeapObjectTag - kPointerSize));
__ mtctr(r6);
__ bind(&loop);
__ LoadPU(scratch, MemOperand(r9, kPointerSize));
__ push(scratch);
__ bdnz(&loop);
__ bind(&done_loop);
}
// Underlying function needs to have bytecode available.
if (FLAG_debug_code) {
__ LoadP(r6, FieldMemOperand(r7, JSFunction::kSharedFunctionInfoOffset));
__ LoadP(r6, FieldMemOperand(r6, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecode(masm, r6, r3);
__ CompareObjectType(r6, r6, r6, BYTECODE_ARRAY_TYPE);
__ Assert(eq, AbortReason::kMissingBytecodeArray);
}
// Resume (Ignition/TurboFan) generator object.
{
// 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.
__ mr(r6, r4);
__ mr(r4, r7);
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kCodeOffset));
__ JumpCodeObject(r5);
}
__ bind(&prepare_step_in_if_stepping);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r4, r7);
// Push hole as receiver since we do not use it for stepping.
__ PushRoot(RootIndex::kTheHoleValue);
__ CallRuntime(Runtime::kDebugOnFunctionCall);
__ Pop(r4);
__ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
}
__ b(&stepping_prepared);
__ bind(&prepare_step_in_suspended_generator);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r4);
__ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
__ Pop(r4);
__ LoadP(r7, FieldMemOperand(r4, 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) {
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ push(r4);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable);
}
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,
Builtins::Name entry_trampoline) {
// The register state is either:
// r3: root_register_value
// r4: code entry
// r5: function
// r6: receiver
// r7: argc
// r8: argv
// or
// r3: root_register_value
// r4: microtask_queue
Label invoke, handler_entry, exit;
{
NoRootArrayScope no_root_array(masm);
// PPC LINUX ABI:
// preserve LR in pre-reserved slot in caller's frame
__ mflr(r0);
__ StoreP(r0, MemOperand(sp, kStackFrameLRSlot * kPointerSize));
// Save callee saved registers on the stack.
__ MultiPush(kCalleeSaved);
// Save callee-saved double registers.
__ MultiPushDoubles(kCalleeSavedDoubles);
// Set up the reserved register for 0.0.
__ LoadDoubleLiteral(kDoubleRegZero, Double(0.0), r0);
// Initialize the root register.
// C calling convention. The first argument is passed in r3.
__ mr(kRootRegister, r3);
}
// Push a frame with special values setup to mark it as an entry frame.
// r4: code entry
// r5: function
// r6: receiver
// r7: argc
// r8: argv
__ li(r0, Operand(-1)); // Push a bad frame pointer to fail if it is used.
__ push(r0);
if (FLAG_enable_embedded_constant_pool) {
__ li(kConstantPoolRegister, Operand::Zero());
__ push(kConstantPoolRegister);
}
__ mov(r0, Operand(StackFrame::TypeToMarker(type)));
__ push(r0);
__ push(r0);
// Save copies of the top frame descriptor on the stack.
__ Move(r3, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ LoadP(r0, MemOperand(r3));
__ push(r0);
Register scratch = r9;
// Set up frame pointer for the frame to be pushed.
__ addi(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(r3, js_entry_sp);
__ LoadP(scratch, MemOperand(r3));
__ cmpi(scratch, Operand::Zero());
__ bne(&non_outermost_js);
__ StoreP(fp, MemOperand(r3));
__ 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); // frame-type
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ b(&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.
{
ConstantPoolUnavailableScope constant_pool_unavailable(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()));
}
__ StoreP(r3, MemOperand(scratch));
__ LoadRoot(r3, RootIndex::kException);
__ b(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
// Must preserve r4-r8.
__ PushStackHandler();
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the b(&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.
// Notice that we cannot store a reference to the trampoline code directly in
// this stub, because runtime stubs are not traversed when doing GC.
// 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()->builtin_handle(entry_trampoline);
__ Call(trampoline_code, RelocInfo::CODE_TARGET);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit); // r3 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(r8);
__ cmpi(r8, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ bne(&non_outermost_js_2);
__ mov(scratch, Operand::Zero());
__ Move(r8, js_entry_sp);
__ StoreP(scratch, MemOperand(r8));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(r6);
__ Move(scratch, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ StoreP(r6, MemOperand(scratch));
// Reset the stack to the callee saved registers.
__ addi(sp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// Restore callee-saved double registers.
__ MultiPopDoubles(kCalleeSavedDoubles);
// Restore callee-saved registers.
__ MultiPop(kCalleeSaved);
// Return
__ LoadP(r0, MemOperand(sp, kStackFrameLRSlot * kPointerSize));
__ mtlr(r0);
__ blr();
}
} // namespace
void Builtins::Generate_JSEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtins::kJSEntryTrampoline);
}
void Builtins::Generate_JSConstructEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::CONSTRUCT_ENTRY,
Builtins::kJSConstructEntryTrampoline);
}
void Builtins::Generate_JSRunMicrotasksEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtins::kRunMicrotasksTrampoline);
}
// 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;
LoadRealStackLimit(masm, scratch1);
// Make scratch1 the space we have left. The stack might already be overflowed
// here which will cause scratch1 to become negative.
__ sub(scratch1, sp, scratch1);
// Check if the arguments will overflow the stack.
__ ShiftLeftImm(scratch2, argc, Operand(kPointerSizeLog2));
__ cmp(scratch1, scratch2);
__ bgt(&okay); // Signed comparison.
// Out of stack space.
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bind(&okay);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// Called from Generate_JS_Entry
// r4: new.target
// r5: function
// r6: receiver
// r7: argc
// r8: argv
// r0,r3,r9, cp may be clobbered
// 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);
__ LoadP(cp, MemOperand(cp));
// Push the function and the receiver onto the stack.
__ Push(r5, r6);
// Check if we have enough stack space to push all arguments.
// Clobbers r3 and r6.
Generate_CheckStackOverflow(masm, r7, r3, r6);
// r4: new.target
// r5: function
// r7: argc
// r8: argv
// r0,r3,r6,r9, cp may be clobbered
// Setup new.target, argc and function.
__ mr(r3, r7);
__ mr(r6, r4);
__ mr(r4, r5);
// r3: argc
// r4: function
// r6: new.target
// r8: argv
// Copy arguments to the stack in a loop.
// r4: function
// r3: argc
// r8: argv, i.e. points to first arg
Label loop, entry;
__ ShiftLeftImm(r0, r3, Operand(kPointerSizeLog2));
__ add(r5, r8, r0);
// r5 points past last arg.
__ b(&entry);
__ bind(&loop);
__ LoadP(r9, MemOperand(r8)); // read next parameter
__ addi(r8, r8, Operand(kPointerSize));
__ LoadP(r0, MemOperand(r9)); // dereference handle
__ push(r0); // push parameter
__ bind(&entry);
__ cmp(r8, r5);
__ bne(&loop);
// r3: argc
// r4: function
// r6: new.target
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(r7, RootIndex::kUndefinedValue);
__ mr(r8, r7);
__ mr(r14, r7);
__ mr(r15, r7);
__ mr(r16, r7);
__ mr(r17, r7);
// 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.
}
__ blr();
// r3: 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.
// r3: root_register_value
// r4: microtask_queue
__ mr(RunMicrotasksDescriptor::MicrotaskQueueRegister(), r4);
__ Jump(BUILTIN_CODE(masm->isolate(), RunMicrotasks), RelocInfo::CODE_TARGET);
}
static void ReplaceClosureCodeWithOptimizedCode(
MacroAssembler* masm, Register optimized_code, Register closure,
Register scratch1, Register scratch2, Register scratch3) {
// Store code entry in the closure.
__ StoreP(optimized_code, FieldMemOperand(closure, JSFunction::kCodeOffset),
r0);
__ mr(scratch1, optimized_code); // Write barrier clobbers scratch1 below.
__ RecordWriteField(closure, JSFunction::kCodeOffset, scratch1, scratch2,
kLRHasNotBeenSaved, kDontSaveFPRegs, OMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
}
static void LeaveInterpreterFrame(MacroAssembler* masm, Register scratch) {
Register args_count = scratch;
// Get the arguments + receiver count.
__ LoadP(args_count,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ lwz(args_count,
FieldMemOperand(args_count, BytecodeArray::kParameterSizeOffset));
// Leave the frame (also dropping the register file).
__ LeaveFrame(StackFrame::INTERPRETED);
__ add(sp, sp, args_count);
}
// Tail-call |function_id| if |smi_entry| == |marker|
static void TailCallRuntimeIfMarkerEquals(MacroAssembler* masm,
Register smi_entry,
OptimizationMarker marker,
Runtime::FunctionId function_id) {
Label no_match;
__ CmpSmiLiteral(smi_entry, Smi::FromEnum(marker), r0);
__ bne(&no_match);
GenerateTailCallToReturnedCode(masm, function_id);
__ bind(&no_match);
}
static void MaybeTailCallOptimizedCodeSlot(MacroAssembler* masm,
Register feedback_vector,
Register scratch1, Register scratch2,
Register scratch3) {
// ----------- S t a t e -------------
// -- r6 : new target (preserved for callee if needed, and caller)
// -- r4 : target function (preserved for callee if needed, and caller)
// -- feedback vector (preserved for caller if needed)
// -----------------------------------
DCHECK(!AreAliased(feedback_vector, r4, r6, scratch1, scratch2, scratch3));
Label optimized_code_slot_is_weak_ref, fallthrough;
Register closure = r4;
Register optimized_code_entry = scratch1;
__ LoadP(
optimized_code_entry,
FieldMemOperand(feedback_vector,
FeedbackVector::kOptimizedCodeWeakOrSmiOffset));
// Check if the code entry is a Smi. If yes, we interpret it as an
// optimisation marker. Otherwise, interpret it as a weak reference to a code
// object.
__ JumpIfNotSmi(optimized_code_entry, &optimized_code_slot_is_weak_ref);
{
// Optimized code slot is a Smi optimization marker.
// Fall through if no optimization trigger.
__ CmpSmiLiteral(optimized_code_entry,
Smi::FromEnum(OptimizationMarker::kNone), r0);
__ beq(&fallthrough);
TailCallRuntimeIfMarkerEquals(masm, optimized_code_entry,
OptimizationMarker::kLogFirstExecution,
Runtime::kFunctionFirstExecution);
TailCallRuntimeIfMarkerEquals(masm, optimized_code_entry,
OptimizationMarker::kCompileOptimized,
Runtime::kCompileOptimized_NotConcurrent);
TailCallRuntimeIfMarkerEquals(
masm, optimized_code_entry,
OptimizationMarker::kCompileOptimizedConcurrent,
Runtime::kCompileOptimized_Concurrent);
{
// Otherwise, the marker is InOptimizationQueue, so fall through hoping
// that an interrupt will eventually update the slot with optimized code.
if (FLAG_debug_code) {
__ CmpSmiLiteral(
optimized_code_entry,
Smi::FromEnum(OptimizationMarker::kInOptimizationQueue), r0);
__ Assert(eq, AbortReason::kExpectedOptimizationSentinel);
}
__ b(&fallthrough);
}
}
{
// Optimized code slot is a weak reference.
__ bind(&optimized_code_slot_is_weak_ref);
__ LoadWeakValue(optimized_code_entry, optimized_code_entry, &fallthrough);
// Check if the optimized code is marked for deopt. If it is, call the
// runtime to clear it.
Label found_deoptimized_code;
__ LoadP(scratch2, FieldMemOperand(optimized_code_entry,
Code::kCodeDataContainerOffset));
__ LoadWordArith(
scratch2,
FieldMemOperand(scratch2, CodeDataContainer::kKindSpecificFlagsOffset));
__ TestBit(scratch2, Code::kMarkedForDeoptimizationBit, r0);
__ bne(&found_deoptimized_code, cr0);
// 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,
scratch2, scratch3, feedback_vector);
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadCodeObjectEntry(r5, optimized_code_entry);
__ Jump(r5);
// Optimized code slot contains deoptimized code, evict it and re-enter the
// closure's code.
__ bind(&found_deoptimized_code);
GenerateTailCallToReturnedCode(masm, Runtime::kEvictOptimizedCodeSlot);
}
// Fall-through if the optimized code cell is clear and there is no
// optimization marker.
__ bind(&fallthrough);
}