// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#if defined(V8_TARGET_ARCH_ARM)
#include "code-stubs.h"
#include "codegen-inl.h"
#include "compiler.h"
#include "debug.h"
#include "full-codegen.h"
#include "parser.h"
#include "scopes.h"
#include "stub-cache.h"
#include "arm/code-stubs-arm.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm_)
// A patch site is a location in the code which it is possible to patch. This
// class has a number of methods to emit the code which is patchable and the
// method EmitPatchInfo to record a marker back to the patchable code. This
// marker is a cmp rx, #yyy instruction, and x * 0x00000fff + yyy (raw 12 bit
// immediate value is used) is the delta from the pc to the first instruction of
// the patchable code.
class JumpPatchSite BASE_EMBEDDED {
public:
explicit JumpPatchSite(MacroAssembler* masm) : masm_(masm) {
#ifdef DEBUG
info_emitted_ = false;
#endif
}
~JumpPatchSite() {
ASSERT(patch_site_.is_bound() == info_emitted_);
}
// When initially emitting this ensure that a jump is always generated to skip
// the inlined smi code.
void EmitJumpIfNotSmi(Register reg, Label* target) {
ASSERT(!patch_site_.is_bound() && !info_emitted_);
__ bind(&patch_site_);
__ cmp(reg, Operand(reg));
// Don't use b(al, ...) as that might emit the constant pool right after the
// branch. After patching when the branch is no longer unconditional
// execution can continue into the constant pool.
__ b(eq, target); // Always taken before patched.
}
// When initially emitting this ensure that a jump is never generated to skip
// the inlined smi code.
void EmitJumpIfSmi(Register reg, Label* target) {
ASSERT(!patch_site_.is_bound() && !info_emitted_);
__ bind(&patch_site_);
__ cmp(reg, Operand(reg));
__ b(ne, target); // Never taken before patched.
}
void EmitPatchInfo() {
int delta_to_patch_site = masm_->InstructionsGeneratedSince(&patch_site_);
Register reg;
reg.set_code(delta_to_patch_site / kOff12Mask);
__ cmp_raw_immediate(reg, delta_to_patch_site % kOff12Mask);
#ifdef DEBUG
info_emitted_ = true;
#endif
}
bool is_bound() const { return patch_site_.is_bound(); }
private:
MacroAssembler* masm_;
Label patch_site_;
#ifdef DEBUG
bool info_emitted_;
#endif
};
// Generate code for a JS function. On entry to the function the receiver
// and arguments have been pushed on the stack left to right. The actual
// argument count matches the formal parameter count expected by the
// function.
//
// The live registers are:
// o r1: the JS function object being called (ie, ourselves)
// o cp: our context
// o fp: our caller's frame pointer
// o sp: stack pointer
// o lr: return address
//
// The function builds a JS frame. Please see JavaScriptFrameConstants in
// frames-arm.h for its layout.
void FullCodeGenerator::Generate(CompilationInfo* info) {
ASSERT(info_ == NULL);
info_ = info;
SetFunctionPosition(function());
Comment cmnt(masm_, "[ function compiled by full code generator");
#ifdef DEBUG
if (strlen(FLAG_stop_at) > 0 &&
info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
__ stop("stop-at");
}
#endif
int locals_count = scope()->num_stack_slots();
__ Push(lr, fp, cp, r1);
if (locals_count > 0) {
// Load undefined value here, so the value is ready for the loop
// below.
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
}
// Adjust fp to point to caller's fp.
__ add(fp, sp, Operand(2 * kPointerSize));
{ Comment cmnt(masm_, "[ Allocate locals");
for (int i = 0; i < locals_count; i++) {
__ push(ip);
}
}
bool function_in_register = true;
// Possibly allocate a local context.
int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
if (heap_slots > 0) {
Comment cmnt(masm_, "[ Allocate local context");
// Argument to NewContext is the function, which is in r1.
__ push(r1);
if (heap_slots <= FastNewContextStub::kMaximumSlots) {
FastNewContextStub stub(heap_slots);
__ CallStub(&stub);
} else {
__ CallRuntime(Runtime::kNewContext, 1);
}
function_in_register = false;
// Context is returned in both r0 and cp. It replaces the context
// passed to us. It's saved in the stack and kept live in cp.
__ str(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
// Copy any necessary parameters into the context.
int num_parameters = scope()->num_parameters();
for (int i = 0; i < num_parameters; i++) {
Slot* slot = scope()->parameter(i)->AsSlot();
if (slot != NULL && slot->type() == Slot::CONTEXT) {
int parameter_offset = StandardFrameConstants::kCallerSPOffset +
(num_parameters - 1 - i) * kPointerSize;
// Load parameter from stack.
__ ldr(r0, MemOperand(fp, parameter_offset));
// Store it in the context.
__ mov(r1, Operand(Context::SlotOffset(slot->index())));
__ str(r0, MemOperand(cp, r1));
// Update the write barrier. This clobbers all involved
// registers, so we have to use two more registers to avoid
// clobbering cp.
__ mov(r2, Operand(cp));
__ RecordWrite(r2, Operand(r1), r3, r0);
}
}
}
Variable* arguments = scope()->arguments();
if (arguments != NULL) {
// Function uses arguments object.
Comment cmnt(masm_, "[ Allocate arguments object");
if (!function_in_register) {
// Load this again, if it's used by the local context below.
__ ldr(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
} else {
__ mov(r3, r1);
}
// Receiver is just before the parameters on the caller's stack.
int offset = scope()->num_parameters() * kPointerSize;
__ add(r2, fp,
Operand(StandardFrameConstants::kCallerSPOffset + offset));
__ mov(r1, Operand(Smi::FromInt(scope()->num_parameters())));
__ Push(r3, r2, r1);
// Arguments to ArgumentsAccessStub:
// function, receiver address, parameter count.
// The stub will rewrite receiever and parameter count if the previous
// stack frame was an arguments adapter frame.
ArgumentsAccessStub stub(
is_strict_mode() ? ArgumentsAccessStub::NEW_STRICT
: ArgumentsAccessStub::NEW_NON_STRICT);
__ CallStub(&stub);
Variable* arguments_shadow = scope()->arguments_shadow();
if (arguments_shadow != NULL) {
// Duplicate the value; move-to-slot operation might clobber registers.
__ mov(r3, r0);
Move(arguments_shadow->AsSlot(), r3, r1, r2);
}
Move(arguments->AsSlot(), r0, r1, r2);
}
if (FLAG_trace) {
__ CallRuntime(Runtime::kTraceEnter, 0);
}
// Visit the declarations and body unless there is an illegal
// redeclaration.
if (scope()->HasIllegalRedeclaration()) {
Comment cmnt(masm_, "[ Declarations");
scope()->VisitIllegalRedeclaration(this);
} else {
{ Comment cmnt(masm_, "[ Declarations");
// For named function expressions, declare the function name as a
// constant.
if (scope()->is_function_scope() && scope()->function() != NULL) {
EmitDeclaration(scope()->function(), Variable::CONST, NULL);
}
VisitDeclarations(scope()->declarations());
}
{ Comment cmnt(masm_, "[ Stack check");
PrepareForBailout(info->function(), NO_REGISTERS);
Label ok;
__ LoadRoot(ip, Heap::kStackLimitRootIndex);
__ cmp(sp, Operand(ip));
__ b(hs, &ok);
StackCheckStub stub;
__ CallStub(&stub);
__ bind(&ok);
}
{ Comment cmnt(masm_, "[ Body");
ASSERT(loop_depth() == 0);
VisitStatements(function()->body());
ASSERT(loop_depth() == 0);
}
}
// Always emit a 'return undefined' in case control fell off the end of
// the body.
{ Comment cmnt(masm_, "[ return <undefined>;");
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
}
EmitReturnSequence();
// Force emit the constant pool, so it doesn't get emitted in the middle
// of the stack check table.
masm()->CheckConstPool(true, false);
}
void FullCodeGenerator::ClearAccumulator() {
__ mov(r0, Operand(Smi::FromInt(0)));
}
void FullCodeGenerator::EmitStackCheck(IterationStatement* stmt) {
Comment cmnt(masm_, "[ Stack check");
Label ok;
__ LoadRoot(ip, Heap::kStackLimitRootIndex);
__ cmp(sp, Operand(ip));
__ b(hs, &ok);
StackCheckStub stub;
__ CallStub(&stub);
// Record a mapping of this PC offset to the OSR id. This is used to find
// the AST id from the unoptimized code in order to use it as a key into
// the deoptimization input data found in the optimized code.
RecordStackCheck(stmt->OsrEntryId());
__ bind(&ok);
PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
// Record a mapping of the OSR id to this PC. This is used if the OSR
// entry becomes the target of a bailout. We don't expect it to be, but
// we want it to work if it is.
PrepareForBailoutForId(stmt->OsrEntryId(), NO_REGISTERS);
}
void FullCodeGenerator::EmitReturnSequence() {
Comment cmnt(masm_, "[ Return sequence");
if (return_label_.is_bound()) {
__ b(&return_label_);
} else {
__ bind(&return_label_);
if (FLAG_trace) {
// Push the return value on the stack as the parameter.
// Runtime::TraceExit returns its parameter in r0.
__ push(r0);
__ CallRuntime(Runtime::kTraceExit, 1);
}
#ifdef DEBUG
// Add a label for checking the size of the code used for returning.
Label check_exit_codesize;
masm_->bind(&check_exit_codesize);
#endif
// Make sure that the constant pool is not emitted inside of the return
// sequence.
{ Assembler::BlockConstPoolScope block_const_pool(masm_);
// Here we use masm_-> instead of the __ macro to avoid the code coverage
// tool from instrumenting as we rely on the code size here.
int32_t sp_delta = (scope()->num_parameters() + 1) * kPointerSize;
CodeGenerator::RecordPositions(masm_, function()->end_position() - 1);
__ RecordJSReturn();
masm_->mov(sp, fp);
masm_->ldm(ia_w, sp, fp.bit() | lr.bit());
masm_->add(sp, sp, Operand(sp_delta));
masm_->Jump(lr);
}
#ifdef DEBUG
// Check that the size of the code used for returning is large enough
// for the debugger's requirements.
ASSERT(Assembler::kJSReturnSequenceInstructions <=
masm_->InstructionsGeneratedSince(&check_exit_codesize));
#endif
}
}
void FullCodeGenerator::EffectContext::Plug(Slot* slot) const {
}
void FullCodeGenerator::AccumulatorValueContext::Plug(Slot* slot) const {
codegen()->Move(result_register(), slot);
}
void FullCodeGenerator::StackValueContext::Plug(Slot* slot) const {
codegen()->Move(result_register(), slot);
__ push(result_register());
}
void FullCodeGenerator::TestContext::Plug(Slot* slot) const {
// For simplicity we always test the accumulator register.
codegen()->Move(result_register(), slot);
codegen()->PrepareForBailoutBeforeSplit(TOS_REG, false, NULL, NULL);
codegen()->DoTest(true_label_, false_label_, fall_through_);
}
void FullCodeGenerator::EffectContext::Plug(Heap::RootListIndex index) const {
}
void FullCodeGenerator::AccumulatorValueContext::Plug(
Heap::RootListIndex index) const {
__ LoadRoot(result_register(), index);
}
void FullCodeGenerator::StackValueContext::Plug(
Heap::RootListIndex index) const {
__ LoadRoot(result_register(), index);
__ push(result_register());
}
void FullCodeGenerator::TestContext::Plug(Heap::RootListIndex index) const {
codegen()->PrepareForBailoutBeforeSplit(TOS_REG,
true,
true_label_,
false_label_);
if (index == Heap::kUndefinedValueRootIndex ||
index == Heap::kNullValueRootIndex ||
index == Heap::kFalseValueRootIndex) {
if (false_label_ != fall_through_) __ b(false_label_);
} else if (index == Heap::kTrueValueRootIndex) {
if (true_label_ != fall_through_) __ b(true_label_);
} else {
__ LoadRoot(result_register(), index);
codegen()->DoTest(true_label_, false_label_, fall_through_);
}
}
void FullCodeGenerator::EffectContext::Plug(Handle<Object> lit) const {
}
void FullCodeGenerator::AccumulatorValueContext::Plug(
Handle<Object> lit) const {
__ mov(result_register(), Operand(lit));
}
void FullCodeGenerator::StackValueContext::Plug(Handle<Object> lit) const {
// Immediates cannot be pushed directly.
__ mov(result_register(), Operand(lit));
__ push(result_register());
}
void FullCodeGenerator::TestContext::Plug(Handle<Object> lit) const {
codegen()->PrepareForBailoutBeforeSplit(TOS_REG,
true,
true_label_,
false_label_);
ASSERT(!lit->IsUndetectableObject()); // There are no undetectable literals.
if (lit->IsUndefined() || lit->IsNull() || lit->IsFalse()) {
if (false_label_ != fall_through_) __ b(false_label_);
} else if (lit->IsTrue() || lit->IsJSObject()) {
if (true_label_ != fall_through_) __ b(true_label_);
} else if (lit->IsString()) {
if (String::cast(*lit)->length() == 0) {
if (false_label_ != fall_through_) __ b(false_label_);
__ b(false_label_);
} else {
if (true_label_ != fall_through_) __ b(true_label_);
}
} else if (lit->IsSmi()) {
if (Smi::cast(*lit)->value() == 0) {
if (false_label_ != fall_through_) __ b(false_label_);
} else {
if (true_label_ != fall_through_) __ b(true_label_);
}
} else {
// For simplicity we always test the accumulator register.
__ mov(result_register(), Operand(lit));
codegen()->DoTest(true_label_, false_label_, fall_through_);
}
}
void FullCodeGenerator::EffectContext::DropAndPlug(int count,
Register reg) const {
ASSERT(count > 0);
__ Drop(count);
}
void FullCodeGenerator::AccumulatorValueContext::DropAndPlug(
int count,
Register reg) const {
ASSERT(count > 0);
__ Drop(count);
__ Move(result_register(), reg);
}
void FullCodeGenerator::StackValueContext::DropAndPlug(int count,
Register reg) const {
ASSERT(count > 0);
if (count > 1) __ Drop(count - 1);
__ str(reg, MemOperand(sp, 0));
}
void FullCodeGenerator::TestContext::DropAndPlug(int count,
Register reg) const {
ASSERT(count > 0);
// For simplicity we always test the accumulator register.
__ Drop(count);
__ Move(result_register(), reg);
codegen()->PrepareForBailoutBeforeSplit(TOS_REG, false, NULL, NULL);
codegen()->DoTest(true_label_, false_label_, fall_through_);
}
void FullCodeGenerator::EffectContext::Plug(Label* materialize_true,
Label* materialize_false) const {
ASSERT(materialize_true == materialize_false);
__ bind(materialize_true);
}
void FullCodeGenerator::AccumulatorValueContext::Plug(
Label* materialize_true,
Label* materialize_false) const {
Label done;
__ bind(materialize_true);
__ LoadRoot(result_register(), Heap::kTrueValueRootIndex);
__ jmp(&done);
__ bind(materialize_false);
__ LoadRoot(result_register(), Heap::kFalseValueRootIndex);
__ bind(&done);
}
void FullCodeGenerator::StackValueContext::Plug(
Label* materialize_true,
Label* materialize_false) const {
Label done;
__ bind(materialize_true);
__ LoadRoot(ip, Heap::kTrueValueRootIndex);
__ push(ip);
__ jmp(&done);
__ bind(materialize_false);
__ LoadRoot(ip, Heap::kFalseValueRootIndex);
__ push(ip);
__ bind(&done);
}
void FullCodeGenerator::TestContext::Plug(Label* materialize_true,
Label* materialize_false) const {
ASSERT(materialize_true == true_label_);
ASSERT(materialize_false == false_label_);
}
void FullCodeGenerator::EffectContext::Plug(bool flag) const {
}
void FullCodeGenerator::AccumulatorValueContext::Plug(bool flag) const {
Heap::RootListIndex value_root_index =
flag ? Heap::kTrueValueRootIndex : Heap::kFalseValueRootIndex;
__ LoadRoot(result_register(), value_root_index);
}
void FullCodeGenerator::StackValueContext::Plug(bool flag) const {
Heap::RootListIndex value_root_index =
flag ? Heap::kTrueValueRootIndex : Heap::kFalseValueRootIndex;
__ LoadRoot(ip, value_root_index);
__ push(ip);
}
void FullCodeGenerator::TestContext::Plug(bool flag) const {
codegen()->PrepareForBailoutBeforeSplit(TOS_REG,
true,
true_label_,
false_label_);
if (flag) {
if (true_label_ != fall_through_) __ b(true_label_);
} else {
if (false_label_ != fall_through_) __ b(false_label_);
}
}
void FullCodeGenerator::DoTest(Label* if_true,
Label* if_false,
Label* fall_through) {
if (CpuFeatures::IsSupported(VFP3)) {
CpuFeatures::Scope scope(VFP3);
// Emit the inlined tests assumed by the stub.
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(result_register(), ip);
__ b(eq, if_false);
__ LoadRoot(ip, Heap::kTrueValueRootIndex);
__ cmp(result_register(), ip);
__ b(eq, if_true);
__ LoadRoot(ip, Heap::kFalseValueRootIndex);
__ cmp(result_register(), ip);
__ b(eq, if_false);
STATIC_ASSERT(kSmiTag == 0);
__ tst(result_register(), result_register());
__ b(eq, if_false);
__ JumpIfSmi(result_register(), if_true);
// Call the ToBoolean stub for all other cases.
ToBooleanStub stub(result_register());
__ CallStub(&stub);
__ tst(result_register(), result_register());
} else {
// Call the runtime to find the boolean value of the source and then
// translate it into control flow to the pair of labels.
__ push(result_register());
__ CallRuntime(Runtime::kToBool, 1);
__ LoadRoot(ip, Heap::kFalseValueRootIndex);
__ cmp(r0, ip);
}
// The stub returns nonzero for true.
Split(ne, if_true, if_false, fall_through);
}
void FullCodeGenerator::Split(Condition cond,
Label* if_true,
Label* if_false,
Label* fall_through) {
if (if_false == fall_through) {
__ b(cond, if_true);
} else if (if_true == fall_through) {
__ b(NegateCondition(cond), if_false);
} else {
__ b(cond, if_true);
__ b(if_false);
}
}
MemOperand FullCodeGenerator::EmitSlotSearch(Slot* slot, Register scratch) {
switch (slot->type()) {
case Slot::PARAMETER:
case Slot::LOCAL:
return MemOperand(fp, SlotOffset(slot));
case Slot::CONTEXT: {
int context_chain_length =
scope()->ContextChainLength(slot->var()->scope());
__ LoadContext(scratch, context_chain_length);
return ContextOperand(scratch, slot->index());
}
case Slot::LOOKUP:
UNREACHABLE();
}
UNREACHABLE();
return MemOperand(r0, 0);
}
void FullCodeGenerator::Move(Register destination, Slot* source) {
// Use destination as scratch.
MemOperand slot_operand = EmitSlotSearch(source, destination);
__ ldr(destination, slot_operand);
}
void FullCodeGenerator::Move(Slot* dst,
Register src,
Register scratch1,
Register scratch2) {
ASSERT(dst->type() != Slot::LOOKUP); // Not yet implemented.
ASSERT(!scratch1.is(src) && !scratch2.is(src));
MemOperand location = EmitSlotSearch(dst, scratch1);
__ str(src, location);
// Emit the write barrier code if the location is in the heap.
if (dst->type() == Slot::CONTEXT) {
__ RecordWrite(scratch1,
Operand(Context::SlotOffset(dst->index())),
scratch2,
src);
}
}
void FullCodeGenerator::PrepareForBailoutBeforeSplit(State state,
bool should_normalize,
Label* if_true,
Label* if_false) {
// Only prepare for bailouts before splits if we're in a test
// context. Otherwise, we let the Visit function deal with the
// preparation to avoid preparing with the same AST id twice.
if (!context()->IsTest() || !info_->IsOptimizable()) return;
Label skip;
if (should_normalize) __ b(&skip);
ForwardBailoutStack* current = forward_bailout_stack_;
while (current != NULL) {
PrepareForBailout(current->expr(), state);
current = current->parent();
}
if (should_normalize) {
__ LoadRoot(ip, Heap::kTrueValueRootIndex);
__ cmp(r0, ip);
Split(eq, if_true, if_false, NULL);
__ bind(&skip);
}
}
void FullCodeGenerator::EmitDeclaration(Variable* variable,
Variable::Mode mode,
FunctionLiteral* function) {
Comment cmnt(masm_, "[ Declaration");
ASSERT(variable != NULL); // Must have been resolved.
Slot* slot = variable->AsSlot();
Property* prop = variable->AsProperty();
if (slot != NULL) {
switch (slot->type()) {
case Slot::PARAMETER:
case Slot::LOCAL:
if (mode == Variable::CONST) {
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ str(ip, MemOperand(fp, SlotOffset(slot)));
} else if (function != NULL) {
VisitForAccumulatorValue(function);
__ str(result_register(), MemOperand(fp, SlotOffset(slot)));
}
break;
case Slot::CONTEXT:
// We bypass the general EmitSlotSearch because we know more about
// this specific context.
// The variable in the decl always resides in the current function
// context.
ASSERT_EQ(0, scope()->ContextChainLength(variable->scope()));
if (FLAG_debug_code) {
// Check that we're not inside a 'with'.
__ ldr(r1, ContextOperand(cp, Context::FCONTEXT_INDEX));
__ cmp(r1, cp);
__ Check(eq, "Unexpected declaration in current context.");
}
if (mode == Variable::CONST) {
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ str(ip, ContextOperand(cp, slot->index()));
// No write barrier since the_hole_value is in old space.
} else if (function != NULL) {
VisitForAccumulatorValue(function);
__ str(result_register(), ContextOperand(cp, slot->index()));
int offset = Context::SlotOffset(slot->index());
// We know that we have written a function, which is not a smi.
__ mov(r1, Operand(cp));
__ RecordWrite(r1, Operand(offset), r2, result_register());
}
break;
case Slot::LOOKUP: {
__ mov(r2, Operand(variable->name()));
// Declaration nodes are always introduced in one of two modes.
ASSERT(mode == Variable::VAR ||
mode == Variable::CONST);
PropertyAttributes attr =
(mode == Variable::VAR) ? NONE : READ_ONLY;
__ mov(r1, Operand(Smi::FromInt(attr)));
// Push initial value, if any.
// Note: For variables we must not push an initial value (such as
// 'undefined') because we may have a (legal) redeclaration and we
// must not destroy the current value.
if (mode == Variable::CONST) {
__ LoadRoot(r0, Heap::kTheHoleValueRootIndex);
__ Push(cp, r2, r1, r0);
} else if (function != NULL) {
__ Push(cp, r2, r1);
// Push initial value for function declaration.
VisitForStackValue(function);
} else {
__ mov(r0, Operand(Smi::FromInt(0))); // No initial value!
__ Push(cp, r2, r1, r0);
}
__ CallRuntime(Runtime::kDeclareContextSlot, 4);
break;
}
}
} else if (prop != NULL) {
if (function != NULL || mode == Variable::CONST) {
// We are declaring a function or constant that rewrites to a
// property. Use (keyed) IC to set the initial value. We
// cannot visit the rewrite because it's shared and we risk
// recording duplicate AST IDs for bailouts from optimized code.
ASSERT(prop->obj()->AsVariableProxy() != NULL);
{ AccumulatorValueContext for_object(this);
EmitVariableLoad(prop->obj()->AsVariableProxy()->var());
}
if (function != NULL) {
__ push(r0);
VisitForAccumulatorValue(function);
__ pop(r2);
} else {
__ mov(r2, r0);
__ LoadRoot(r0, Heap::kTheHoleValueRootIndex);
}
ASSERT(prop->key()->AsLiteral() != NULL &&
prop->key()->AsLiteral()->handle()->IsSmi());
__ mov(r1, Operand(prop->key()->AsLiteral()->handle()));
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->KeyedStoreIC_Initialize_Strict()
: isolate()->builtins()->KeyedStoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
// Value in r0 is ignored (declarations are statements).
}
}
}
void FullCodeGenerator::VisitDeclaration(Declaration* decl) {
EmitDeclaration(decl->proxy()->var(), decl->mode(), decl->fun());
}
void FullCodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
// Call the runtime to declare the globals.
// The context is the first argument.
__ mov(r2, Operand(pairs));
__ mov(r1, Operand(Smi::FromInt(is_eval() ? 1 : 0)));
__ mov(r0, Operand(Smi::FromInt(strict_mode_flag())));
__ Push(cp, r2, r1, r0);
__ CallRuntime(Runtime::kDeclareGlobals, 4);
// Return value is ignored.
}
void FullCodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) {
Comment cmnt(masm_, "[ SwitchStatement");
Breakable nested_statement(this, stmt);
SetStatementPosition(stmt);
// Keep the switch value on the stack until a case matches.
VisitForStackValue(stmt->tag());
PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
ZoneList<CaseClause*>* clauses = stmt->cases();
CaseClause* default_clause = NULL; // Can occur anywhere in the list.
Label next_test; // Recycled for each test.
// Compile all the tests with branches to their bodies.
for (int i = 0; i < clauses->length(); i++) {
CaseClause* clause = clauses->at(i);
clause->body_target()->entry_label()->Unuse();
// The default is not a test, but remember it as final fall through.
if (clause->is_default()) {
default_clause = clause;
continue;
}
Comment cmnt(masm_, "[ Case comparison");
__ bind(&next_test);
next_test.Unuse();
// Compile the label expression.
VisitForAccumulatorValue(clause->label());
// Perform the comparison as if via '==='.
__ ldr(r1, MemOperand(sp, 0)); // Switch value.
bool inline_smi_code = ShouldInlineSmiCase(Token::EQ_STRICT);
JumpPatchSite patch_site(masm_);
if (inline_smi_code) {
Label slow_case;
__ orr(r2, r1, r0);
patch_site.EmitJumpIfNotSmi(r2, &slow_case);
__ cmp(r1, r0);
__ b(ne, &next_test);
__ Drop(1); // Switch value is no longer needed.
__ b(clause->body_target()->entry_label());
__ bind(&slow_case);
}
// Record position before stub call for type feedback.
SetSourcePosition(clause->position());
Handle<Code> ic = CompareIC::GetUninitialized(Token::EQ_STRICT);
EmitCallIC(ic, &patch_site);
__ cmp(r0, Operand(0));
__ b(ne, &next_test);
__ Drop(1); // Switch value is no longer needed.
__ b(clause->body_target()->entry_label());
}
// Discard the test value and jump to the default if present, otherwise to
// the end of the statement.
__ bind(&next_test);
__ Drop(1); // Switch value is no longer needed.
if (default_clause == NULL) {
__ b(nested_statement.break_target());
} else {
__ b(default_clause->body_target()->entry_label());
}
// Compile all the case bodies.
for (int i = 0; i < clauses->length(); i++) {
Comment cmnt(masm_, "[ Case body");
CaseClause* clause = clauses->at(i);
__ bind(clause->body_target()->entry_label());
PrepareForBailoutForId(clause->EntryId(), NO_REGISTERS);
VisitStatements(clause->statements());
}
__ bind(nested_statement.break_target());
PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS);
}
void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
Comment cmnt(masm_, "[ ForInStatement");
SetStatementPosition(stmt);
Label loop, exit;
ForIn loop_statement(this, stmt);
increment_loop_depth();
// Get the object to enumerate over. Both SpiderMonkey and JSC
// ignore null and undefined in contrast to the specification; see
// ECMA-262 section 12.6.4.
VisitForAccumulatorValue(stmt->enumerable());
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(r0, ip);
__ b(eq, &exit);
Register null_value = r5;
__ LoadRoot(null_value, Heap::kNullValueRootIndex);
__ cmp(r0, null_value);
__ b(eq, &exit);
// Convert the object to a JS object.
Label convert, done_convert;
__ JumpIfSmi(r0, &convert);
__ CompareObjectType(r0, r1, r1, FIRST_JS_OBJECT_TYPE);
__ b(hs, &done_convert);
__ bind(&convert);
__ push(r0);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_JS);
__ bind(&done_convert);
__ push(r0);
// Check cache validity in generated code. This is a fast case for
// the JSObject::IsSimpleEnum cache validity checks. If we cannot
// guarantee cache validity, call the runtime system to check cache
// validity or get the property names in a fixed array.
Label next, call_runtime;
// Preload a couple of values used in the loop.
Register empty_fixed_array_value = r6;
__ LoadRoot(empty_fixed_array_value, Heap::kEmptyFixedArrayRootIndex);
Register empty_descriptor_array_value = r7;
__ LoadRoot(empty_descriptor_array_value,
Heap::kEmptyDescriptorArrayRootIndex);
__ mov(r1, r0);
__ bind(&next);
// Check that there are no elements. Register r1 contains the
// current JS object we've reached through the prototype chain.
__ ldr(r2, FieldMemOperand(r1, JSObject::kElementsOffset));
__ cmp(r2, empty_fixed_array_value);
__ b(ne, &call_runtime);
// Check that instance descriptors are not empty so that we can
// check for an enum cache. Leave the map in r2 for the subsequent
// prototype load.
__ ldr(r2, FieldMemOperand(r1, HeapObject::kMapOffset));
__ ldr(r3, FieldMemOperand(r2, Map::kInstanceDescriptorsOffset));
__ cmp(r3, empty_descriptor_array_value);
__ b(eq, &call_runtime);
// Check that there is an enum cache in the non-empty instance
// descriptors (r3). This is the case if the next enumeration
// index field does not contain a smi.
__ ldr(r3, FieldMemOperand(r3, DescriptorArray::kEnumerationIndexOffset));
__ JumpIfSmi(r3, &call_runtime);
// For all objects but the receiver, check that the cache is empty.
Label check_prototype;
__ cmp(r1, r0);
__ b(eq, &check_prototype);
__ ldr(r3, FieldMemOperand(r3, DescriptorArray::kEnumCacheBridgeCacheOffset));
__ cmp(r3, empty_fixed_array_value);
__ b(ne, &call_runtime);
// Load the prototype from the map and loop if non-null.
__ bind(&check_prototype);
__ ldr(r1, FieldMemOperand(r2, Map::kPrototypeOffset));
__ cmp(r1, null_value);
__ b(ne, &next);
// The enum cache is valid. Load the map of the object being
// iterated over and use the cache for the iteration.
Label use_cache;
__ ldr(r0, FieldMemOperand(r0, HeapObject::kMapOffset));
__ b(&use_cache);
// Get the set of properties to enumerate.
__ bind(&call_runtime);
__ push(r0); // Duplicate the enumerable object on the stack.
__ CallRuntime(Runtime::kGetPropertyNamesFast, 1);
// If we got a map from the runtime call, we can do a fast
// modification check. Otherwise, we got a fixed array, and we have
// to do a slow check.
Label fixed_array;
__ mov(r2, r0);
__ ldr(r1, FieldMemOperand(r2, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kMetaMapRootIndex);
__ cmp(r1, ip);
__ b(ne, &fixed_array);
// We got a map in register r0. Get the enumeration cache from it.
__ bind(&use_cache);
__ ldr(r1, FieldMemOperand(r0, Map::kInstanceDescriptorsOffset));
__ ldr(r1, FieldMemOperand(r1, DescriptorArray::kEnumerationIndexOffset));
__ ldr(r2, FieldMemOperand(r1, DescriptorArray::kEnumCacheBridgeCacheOffset));
// Setup the four remaining stack slots.
__ push(r0); // Map.
__ ldr(r1, FieldMemOperand(r2, FixedArray::kLengthOffset));
__ mov(r0, Operand(Smi::FromInt(0)));
// Push enumeration cache, enumeration cache length (as smi) and zero.
__ Push(r2, r1, r0);
__ jmp(&loop);
// We got a fixed array in register r0. Iterate through that.
__ bind(&fixed_array);
__ mov(r1, Operand(Smi::FromInt(0))); // Map (0) - force slow check.
__ Push(r1, r0);
__ ldr(r1, FieldMemOperand(r0, FixedArray::kLengthOffset));
__ mov(r0, Operand(Smi::FromInt(0)));
__ Push(r1, r0); // Fixed array length (as smi) and initial index.
// Generate code for doing the condition check.
__ bind(&loop);
// Load the current count to r0, load the length to r1.
__ Ldrd(r0, r1, MemOperand(sp, 0 * kPointerSize));
__ cmp(r0, r1); // Compare to the array length.
__ b(hs, loop_statement.break_target());
// Get the current entry of the array into register r3.
__ ldr(r2, MemOperand(sp, 2 * kPointerSize));
__ add(r2, r2, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ ldr(r3, MemOperand(r2, r0, LSL, kPointerSizeLog2 - kSmiTagSize));
// Get the expected map from the stack or a zero map in the
// permanent slow case into register r2.
__ ldr(r2, MemOperand(sp, 3 * kPointerSize));
// Check if the expected map still matches that of the enumerable.
// If not, we have to filter the key.
Label update_each;
__ ldr(r1, MemOperand(sp, 4 * kPointerSize));
__ ldr(r4, FieldMemOperand(r1, HeapObject::kMapOffset));
__ cmp(r4, Operand(r2));
__ b(eq, &update_each);
// Convert the entry to a string or (smi) 0 if it isn't a property
// any more. If the property has been removed while iterating, we
// just skip it.
__ push(r1); // Enumerable.
__ push(r3); // Current entry.
__ InvokeBuiltin(Builtins::FILTER_KEY, CALL_JS);
__ mov(r3, Operand(r0), SetCC);
__ b(eq, loop_statement.continue_target());
// Update the 'each' property or variable from the possibly filtered
// entry in register r3.
__ bind(&update_each);
__ mov(result_register(), r3);
// Perform the assignment as if via '='.
{ EffectContext context(this);
EmitAssignment(stmt->each(), stmt->AssignmentId());
}
// Generate code for the body of the loop.
Visit(stmt->body());
// Generate code for the going to the next element by incrementing
// the index (smi) stored on top of the stack.
__ bind(loop_statement.continue_target());
__ pop(r0);
__ add(r0, r0, Operand(Smi::FromInt(1)));
__ push(r0);
EmitStackCheck(stmt);
__ b(&loop);
// Remove the pointers stored on the stack.
__ bind(loop_statement.break_target());
__ Drop(5);
// Exit and decrement the loop depth.
__ bind(&exit);
decrement_loop_depth();
}
void FullCodeGenerator::EmitNewClosure(Handle<SharedFunctionInfo> info,
bool pretenure) {
// Use the fast case closure allocation code that allocates in new
// space for nested functions that don't need literals cloning. If
// we're running with the --always-opt or the --prepare-always-opt
// flag, we need to use the runtime function so that the new function
// we are creating here gets a chance to have its code optimized and
// doesn't just get a copy of the existing unoptimized code.
if (!FLAG_always_opt &&
!FLAG_prepare_always_opt &&
!pretenure &&
scope()->is_function_scope() &&
info->num_literals() == 0) {
FastNewClosureStub stub(info->strict_mode() ? kStrictMode : kNonStrictMode);
__ mov(r0, Operand(info));
__ push(r0);
__ CallStub(&stub);
} else {
__ mov(r0, Operand(info));
__ LoadRoot(r1, pretenure ? Heap::kTrueValueRootIndex
: Heap::kFalseValueRootIndex);
__ Push(cp, r0, r1);
__ CallRuntime(Runtime::kNewClosure, 3);
}
context()->Plug(r0);
}
void FullCodeGenerator::VisitVariableProxy(VariableProxy* expr) {
Comment cmnt(masm_, "[ VariableProxy");
EmitVariableLoad(expr->var());
}
MemOperand FullCodeGenerator::ContextSlotOperandCheckExtensions(
Slot* slot,
Label* slow) {
ASSERT(slot->type() == Slot::CONTEXT);
Register context = cp;
Register next = r3;
Register temp = r4;
for (Scope* s = scope(); s != slot->var()->scope(); s = s->outer_scope()) {
if (s->num_heap_slots() > 0) {
if (s->calls_eval()) {
// Check that extension is NULL.
__ ldr(temp, ContextOperand(context, Context::EXTENSION_INDEX));
__ tst(temp, temp);
__ b(ne, slow);
}
__ ldr(next, ContextOperand(context, Context::CLOSURE_INDEX));
__ ldr(next, FieldMemOperand(next, JSFunction::kContextOffset));
// Walk the rest of the chain without clobbering cp.
context = next;
}
}
// Check that last extension is NULL.
__ ldr(temp, ContextOperand(context, Context::EXTENSION_INDEX));
__ tst(temp, temp);
__ b(ne, slow);
// This function is used only for loads, not stores, so it's safe to
// return an cp-based operand (the write barrier cannot be allowed to
// destroy the cp register).
return ContextOperand(context, slot->index());
}
void FullCodeGenerator::EmitDynamicLoadFromSlotFastCase(
Slot* slot,
TypeofState typeof_state,
Label* slow,
Label* done) {
// Generate fast-case code for variables that might be shadowed by
// eval-introduced variables. Eval is used a lot without
// introducing variables. In those cases, we do not want to
// perform a runtime call for all variables in the scope
// containing the eval.
if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) {
EmitLoadGlobalSlotCheckExtensions(slot, typeof_state, slow);
__ jmp(done);
} else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) {
Slot* potential_slot = slot->var()->local_if_not_shadowed()->AsSlot();
Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite();
if (potential_slot != NULL) {
// Generate fast case for locals that rewrite to slots.
__ ldr(r0, ContextSlotOperandCheckExtensions(potential_slot, slow));
if (potential_slot->var()->mode() == Variable::CONST) {
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ cmp(r0, ip);
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
}
__ jmp(done);
} else if (rewrite != NULL) {
// Generate fast case for calls of an argument function.
Property* property = rewrite->AsProperty();
if (property != NULL) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
Literal* key_literal = property->key()->AsLiteral();
if (obj_proxy != NULL &&
key_literal != NULL &&
obj_proxy->IsArguments() &&
key_literal->handle()->IsSmi()) {
// Load arguments object if there are no eval-introduced
// variables. Then load the argument from the arguments
// object using keyed load.
__ ldr(r1,
ContextSlotOperandCheckExtensions(obj_proxy->var()->AsSlot(),
slow));
__ mov(r0, Operand(key_literal->handle()));
Handle<Code> ic =
isolate()->builtins()->KeyedLoadIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
__ jmp(done);
}
}
}
}
}
void FullCodeGenerator::EmitLoadGlobalSlotCheckExtensions(
Slot* slot,
TypeofState typeof_state,
Label* slow) {
Register current = cp;
Register next = r1;
Register temp = r2;
Scope* s = scope();
while (s != NULL) {
if (s->num_heap_slots() > 0) {
if (s->calls_eval()) {
// Check that extension is NULL.
__ ldr(temp, ContextOperand(current, Context::EXTENSION_INDEX));
__ tst(temp, temp);
__ b(ne, slow);
}
// Load next context in chain.
__ ldr(next, ContextOperand(current, Context::CLOSURE_INDEX));
__ ldr(next, FieldMemOperand(next, JSFunction::kContextOffset));
// Walk the rest of the chain without clobbering cp.
current = next;
}
// If no outer scope calls eval, we do not need to check more
// context extensions.
if (!s->outer_scope_calls_eval() || s->is_eval_scope()) break;
s = s->outer_scope();
}
if (s->is_eval_scope()) {
Label loop, fast;
if (!current.is(next)) {
__ Move(next, current);
}
__ bind(&loop);
// Terminate at global context.
__ ldr(temp, FieldMemOperand(next, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
__ cmp(temp, ip);
__ b(eq, &fast);
// Check that extension is NULL.
__ ldr(temp, ContextOperand(next, Context::EXTENSION_INDEX));
__ tst(temp, temp);
__ b(ne, slow);
// Load next context in chain.
__ ldr(next, ContextOperand(next, Context::CLOSURE_INDEX));
__ ldr(next, FieldMemOperand(next, JSFunction::kContextOffset));
__ b(&loop);
__ bind(&fast);
}
__ ldr(r0, GlobalObjectOperand());
__ mov(r2, Operand(slot->var()->name()));
RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
? RelocInfo::CODE_TARGET
: RelocInfo::CODE_TARGET_CONTEXT;
Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
EmitCallIC(ic, mode);
}
void FullCodeGenerator::EmitVariableLoad(Variable* var) {
// Four cases: non-this global variables, lookup slots, all other
// types of slots, and parameters that rewrite to explicit property
// accesses on the arguments object.
Slot* slot = var->AsSlot();
Property* property = var->AsProperty();
if (var->is_global() && !var->is_this()) {
Comment cmnt(masm_, "Global variable");
// Use inline caching. Variable name is passed in r2 and the global
// object (receiver) in r0.
__ ldr(r0, GlobalObjectOperand());
__ mov(r2, Operand(var->name()));
Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
context()->Plug(r0);
} else if (slot != NULL && slot->type() == Slot::LOOKUP) {
Label done, slow;
// Generate code for loading from variables potentially shadowed
// by eval-introduced variables.
EmitDynamicLoadFromSlotFastCase(slot, NOT_INSIDE_TYPEOF, &slow, &done);
__ bind(&slow);
Comment cmnt(masm_, "Lookup slot");
__ mov(r1, Operand(var->name()));
__ Push(cp, r1); // Context and name.
__ CallRuntime(Runtime::kLoadContextSlot, 2);
__ bind(&done);
context()->Plug(r0);
} else if (slot != NULL) {
Comment cmnt(masm_, (slot->type() == Slot::CONTEXT)
? "Context slot"
: "Stack slot");
if (var->mode() == Variable::CONST) {
// Constants may be the hole value if they have not been initialized.
// Unhole them.
MemOperand slot_operand = EmitSlotSearch(slot, r0);
__ ldr(r0, slot_operand);
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ cmp(r0, ip);
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
context()->Plug(r0);
} else {
context()->Plug(slot);
}
} else {
Comment cmnt(masm_, "Rewritten parameter");
ASSERT_NOT_NULL(property);
// Rewritten parameter accesses are of the form "slot[literal]".
// Assert that the object is in a slot.
Variable* object_var = property->obj()->AsVariableProxy()->AsVariable();
ASSERT_NOT_NULL(object_var);
Slot* object_slot = object_var->AsSlot();
ASSERT_NOT_NULL(object_slot);
// Load the object.
Move(r1, object_slot);
// Assert that the key is a smi.
Literal* key_literal = property->key()->AsLiteral();
ASSERT_NOT_NULL(key_literal);
ASSERT(key_literal->handle()->IsSmi());
// Load the key.
__ mov(r0, Operand(key_literal->handle()));
// Call keyed load IC. It has arguments key and receiver in r0 and r1.
Handle<Code> ic = isolate()->builtins()->KeyedLoadIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
context()->Plug(r0);
}
}
void FullCodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) {
Comment cmnt(masm_, "[ RegExpLiteral");
Label materialized;
// Registers will be used as follows:
// r5 = materialized value (RegExp literal)
// r4 = JS function, literals array
// r3 = literal index
// r2 = RegExp pattern
// r1 = RegExp flags
// r0 = RegExp literal clone
__ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ ldr(r4, FieldMemOperand(r0, JSFunction::kLiteralsOffset));
int literal_offset =
FixedArray::kHeaderSize + expr->literal_index() * kPointerSize;
__ ldr(r5, FieldMemOperand(r4, literal_offset));
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(r5, ip);
__ b(ne, &materialized);
// Create regexp literal using runtime function.
// Result will be in r0.
__ mov(r3, Operand(Smi::FromInt(expr->literal_index())));
__ mov(r2, Operand(expr->pattern()));
__ mov(r1, Operand(expr->flags()));
__ Push(r4, r3, r2, r1);
__ CallRuntime(Runtime::kMaterializeRegExpLiteral, 4);
__ mov(r5, r0);
__ bind(&materialized);
int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
Label allocated, runtime_allocate;
__ AllocateInNewSpace(size, r0, r2, r3, &runtime_allocate, TAG_OBJECT);
__ jmp(&allocated);
__ bind(&runtime_allocate);
__ push(r5);
__ mov(r0, Operand(Smi::FromInt(size)));
__ push(r0);
__ CallRuntime(Runtime::kAllocateInNewSpace, 1);
__ pop(r5);
__ bind(&allocated);
// After this, registers are used as follows:
// r0: Newly allocated regexp.
// r5: Materialized regexp.
// r2: temp.
__ CopyFields(r0, r5, r2.bit(), size / kPointerSize);
context()->Plug(r0);
}
void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
Comment cmnt(masm_, "[ ObjectLiteral");
__ ldr(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ ldr(r3, FieldMemOperand(r3, JSFunction::kLiteralsOffset));
__ mov(r2, Operand(Smi::FromInt(expr->literal_index())));
__ mov(r1, Operand(expr->constant_properties()));
int flags = expr->fast_elements()
? ObjectLiteral::kFastElements
: ObjectLiteral::kNoFlags;
flags |= expr->has_function()
? ObjectLiteral::kHasFunction
: ObjectLiteral::kNoFlags;
__ mov(r0, Operand(Smi::FromInt(flags)));
__ Push(r3, r2, r1, r0);
if (expr->depth() > 1) {
__ CallRuntime(Runtime::kCreateObjectLiteral, 4);
} else {
__ CallRuntime(Runtime::kCreateObjectLiteralShallow, 4);
}
// If result_saved is true the result is on top of the stack. If
// result_saved is false the result is in r0.
bool result_saved = false;
// Mark all computed expressions that are bound to a key that
// is shadowed by a later occurrence of the same key. For the
// marked expressions, no store code is emitted.
expr->CalculateEmitStore();
for (int i = 0; i < expr->properties()->length(); i++) {
ObjectLiteral::Property* property = expr->properties()->at(i);
if (property->IsCompileTimeValue()) continue;
Literal* key = property->key();
Expression* value = property->value();
if (!result_saved) {
__ push(r0); // Save result on stack
result_saved = true;
}
switch (property->kind()) {
case ObjectLiteral::Property::CONSTANT:
UNREACHABLE();
case ObjectLiteral::Property::MATERIALIZED_LITERAL:
ASSERT(!CompileTimeValue::IsCompileTimeValue(property->value()));
// Fall through.
case ObjectLiteral::Property::COMPUTED:
if (key->handle()->IsSymbol()) {
if (property->emit_store()) {
VisitForAccumulatorValue(value);
__ mov(r2, Operand(key->handle()));
__ ldr(r1, MemOperand(sp));
Handle<Code> ic = isolate()->builtins()->StoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
PrepareForBailoutForId(key->id(), NO_REGISTERS);
} else {
VisitForEffect(value);
}
break;
}
// Fall through.
case ObjectLiteral::Property::PROTOTYPE:
// Duplicate receiver on stack.
__ ldr(r0, MemOperand(sp));
__ push(r0);
VisitForStackValue(key);
VisitForStackValue(value);
if (property->emit_store()) {
__ mov(r0, Operand(Smi::FromInt(NONE))); // PropertyAttributes
__ push(r0);
__ CallRuntime(Runtime::kSetProperty, 4);
} else {
__ Drop(3);
}
break;
case ObjectLiteral::Property::GETTER:
case ObjectLiteral::Property::SETTER:
// Duplicate receiver on stack.
__ ldr(r0, MemOperand(sp));
__ push(r0);
VisitForStackValue(key);
__ mov(r1, Operand(property->kind() == ObjectLiteral::Property::SETTER ?
Smi::FromInt(1) :
Smi::FromInt(0)));
__ push(r1);
VisitForStackValue(value);
__ CallRuntime(Runtime::kDefineAccessor, 4);
break;
}
}
if (expr->has_function()) {
ASSERT(result_saved);
__ ldr(r0, MemOperand(sp));
__ push(r0);
__ CallRuntime(Runtime::kToFastProperties, 1);
}
if (result_saved) {
context()->PlugTOS();
} else {
context()->Plug(r0);
}
}
void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
Comment cmnt(masm_, "[ ArrayLiteral");
ZoneList<Expression*>* subexprs = expr->values();
int length = subexprs->length();
__ ldr(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ ldr(r3, FieldMemOperand(r3, JSFunction::kLiteralsOffset));
__ mov(r2, Operand(Smi::FromInt(expr->literal_index())));
__ mov(r1, Operand(expr->constant_elements()));
__ Push(r3, r2, r1);
if (expr->constant_elements()->map() ==
isolate()->heap()->fixed_cow_array_map()) {
FastCloneShallowArrayStub stub(
FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS, length);
__ CallStub(&stub);
__ IncrementCounter(
isolate()->counters()->cow_arrays_created_stub(), 1, r1, r2);
} else if (expr->depth() > 1) {
__ CallRuntime(Runtime::kCreateArrayLiteral, 3);
} else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
__ CallRuntime(Runtime::kCreateArrayLiteralShallow, 3);
} else {
FastCloneShallowArrayStub stub(
FastCloneShallowArrayStub::CLONE_ELEMENTS, length);
__ CallStub(&stub);
}
bool result_saved = false; // Is the result saved to the stack?
// Emit code to evaluate all the non-constant subexpressions and to store
// them into the newly cloned array.
for (int i = 0; i < length; i++) {
Expression* subexpr = subexprs->at(i);
// If the subexpression is a literal or a simple materialized literal it
// is already set in the cloned array.
if (subexpr->AsLiteral() != NULL ||
CompileTimeValue::IsCompileTimeValue(subexpr)) {
continue;
}
if (!result_saved) {
__ push(r0);
result_saved = true;
}
VisitForAccumulatorValue(subexpr);
// Store the subexpression value in the array's elements.
__ ldr(r1, MemOperand(sp)); // Copy of array literal.
__ ldr(r1, FieldMemOperand(r1, JSObject::kElementsOffset));
int offset = FixedArray::kHeaderSize + (i * kPointerSize);
__ str(result_register(), FieldMemOperand(r1, offset));
// Update the write barrier for the array store with r0 as the scratch
// register.
__ RecordWrite(r1, Operand(offset), r2, result_register());
PrepareForBailoutForId(expr->GetIdForElement(i), NO_REGISTERS);
}
if (result_saved) {
context()->PlugTOS();
} else {
context()->Plug(r0);
}
}
void FullCodeGenerator::VisitAssignment(Assignment* expr) {
Comment cmnt(masm_, "[ Assignment");
// Invalid left-hand sides are rewritten to have a 'throw ReferenceError'
// on the left-hand side.
if (!expr->target()->IsValidLeftHandSide()) {
VisitForEffect(expr->target());
return;
}
// Left-hand side can only be a property, a global or a (parameter or local)
// slot. Variables with rewrite to .arguments are treated as KEYED_PROPERTY.
enum LhsKind { VARIABLE, NAMED_PROPERTY, KEYED_PROPERTY };
LhsKind assign_type = VARIABLE;
Property* property = expr->target()->AsProperty();
if (property != NULL) {
assign_type = (property->key()->IsPropertyName())
? NAMED_PROPERTY
: KEYED_PROPERTY;
}
// Evaluate LHS expression.
switch (assign_type) {
case VARIABLE:
// Nothing to do here.
break;
case NAMED_PROPERTY:
if (expr->is_compound()) {
// We need the receiver both on the stack and in the accumulator.
VisitForAccumulatorValue(property->obj());
__ push(result_register());
} else {
VisitForStackValue(property->obj());
}
break;
case KEYED_PROPERTY:
if (expr->is_compound()) {
if (property->is_arguments_access()) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
__ ldr(r0, EmitSlotSearch(obj_proxy->var()->AsSlot(), r0));
__ push(r0);
__ mov(r0, Operand(property->key()->AsLiteral()->handle()));
} else {
VisitForStackValue(property->obj());
VisitForAccumulatorValue(property->key());
}
__ ldr(r1, MemOperand(sp, 0));
__ push(r0);
} else {
if (property->is_arguments_access()) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
__ ldr(r1, EmitSlotSearch(obj_proxy->var()->AsSlot(), r0));
__ mov(r0, Operand(property->key()->AsLiteral()->handle()));
__ Push(r1, r0);
} else {
VisitForStackValue(property->obj());
VisitForStackValue(property->key());
}
}
break;
}
// For compound assignments we need another deoptimization point after the
// variable/property load.
if (expr->is_compound()) {
{ AccumulatorValueContext context(this);
switch (assign_type) {
case VARIABLE:
EmitVariableLoad(expr->target()->AsVariableProxy()->var());
PrepareForBailout(expr->target(), TOS_REG);
break;
case NAMED_PROPERTY:
EmitNamedPropertyLoad(property);
PrepareForBailoutForId(expr->CompoundLoadId(), TOS_REG);
break;
case KEYED_PROPERTY:
EmitKeyedPropertyLoad(property);
PrepareForBailoutForId(expr->CompoundLoadId(), TOS_REG);
break;
}
}
Token::Value op = expr->binary_op();
__ push(r0); // Left operand goes on the stack.
VisitForAccumulatorValue(expr->value());
OverwriteMode mode = expr->value()->ResultOverwriteAllowed()
? OVERWRITE_RIGHT
: NO_OVERWRITE;
SetSourcePosition(expr->position() + 1);
AccumulatorValueContext context(this);
if (ShouldInlineSmiCase(op)) {
EmitInlineSmiBinaryOp(expr,
op,
mode,
expr->target(),
expr->value());
} else {
EmitBinaryOp(op, mode);
}
// Deoptimization point in case the binary operation may have side effects.
PrepareForBailout(expr->binary_operation(), TOS_REG);
} else {
VisitForAccumulatorValue(expr->value());
}
// Record source position before possible IC call.
SetSourcePosition(expr->position());
// Store the value.
switch (assign_type) {
case VARIABLE:
EmitVariableAssignment(expr->target()->AsVariableProxy()->var(),
expr->op());
PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
context()->Plug(r0);
break;
case NAMED_PROPERTY:
EmitNamedPropertyAssignment(expr);
break;
case KEYED_PROPERTY:
EmitKeyedPropertyAssignment(expr);
break;
}
}
void FullCodeGenerator::EmitNamedPropertyLoad(Property* prop) {
SetSourcePosition(prop->position());
Literal* key = prop->key()->AsLiteral();
__ mov(r2, Operand(key->handle()));
// Call load IC. It has arguments receiver and property name r0 and r2.
Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
}
void FullCodeGenerator::EmitKeyedPropertyLoad(Property* prop) {
SetSourcePosition(prop->position());
// Call keyed load IC. It has arguments key and receiver in r0 and r1.
Handle<Code> ic = isolate()->builtins()->KeyedLoadIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
}
void FullCodeGenerator::EmitInlineSmiBinaryOp(Expression* expr,
Token::Value op,
OverwriteMode mode,
Expression* left_expr,
Expression* right_expr) {
Label done, smi_case, stub_call;
Register scratch1 = r2;
Register scratch2 = r3;
// Get the arguments.
Register left = r1;
Register right = r0;
__ pop(left);
// Perform combined smi check on both operands.
__ orr(scratch1, left, Operand(right));
STATIC_ASSERT(kSmiTag == 0);
JumpPatchSite patch_site(masm_);
patch_site.EmitJumpIfSmi(scratch1, &smi_case);
__ bind(&stub_call);
TypeRecordingBinaryOpStub stub(op, mode);
EmitCallIC(stub.GetCode(), &patch_site);
__ jmp(&done);
__ bind(&smi_case);
// Smi case. This code works the same way as the smi-smi case in the type
// recording binary operation stub, see
// TypeRecordingBinaryOpStub::GenerateSmiSmiOperation for comments.
switch (op) {
case Token::SAR:
__ b(&stub_call);
__ GetLeastBitsFromSmi(scratch1, right, 5);
__ mov(right, Operand(left, ASR, scratch1));
__ bic(right, right, Operand(kSmiTagMask));
break;
case Token::SHL: {
__ b(&stub_call);
__ SmiUntag(scratch1, left);
__ GetLeastBitsFromSmi(scratch2, right, 5);
__ mov(scratch1, Operand(scratch1, LSL, scratch2));
__ add(scratch2, scratch1, Operand(0x40000000), SetCC);
__ b(mi, &stub_call);
__ SmiTag(right, scratch1);
break;
}
case Token::SHR: {
__ b(&stub_call);
__ SmiUntag(scratch1, left);
__ GetLeastBitsFromSmi(scratch2, right, 5);
__ mov(scratch1, Operand(scratch1, LSR, scratch2));
__ tst(scratch1, Operand(0xc0000000));
__ b(ne, &stub_call);
__ SmiTag(right, scratch1);
break;
}
case Token::ADD:
__ add(scratch1, left, Operand(right), SetCC);
__ b(vs, &stub_call);
__ mov(right, scratch1);
break;
case Token::SUB:
__ sub(scratch1, left, Operand(right), SetCC);
__ b(vs, &stub_call);
__ mov(right, scratch1);
break;
case Token::MUL: {
__ SmiUntag(ip, right);
__ smull(scratch1, scratch2, left, ip);
__ mov(ip, Operand(scratch1, ASR, 31));
__ cmp(ip, Operand(scratch2));
__ b(ne, &stub_call);
__ tst(scratch1, Operand(scratch1));
__ mov(right, Operand(scratch1), LeaveCC, ne);
__ b(ne, &done);
__ add(scratch2, right, Operand(left), SetCC);
__ mov(right, Operand(Smi::FromInt(0)), LeaveCC, pl);
__ b(mi, &stub_call);
break;
}
case Token::BIT_OR:
__ orr(right, left, Operand(right));
break;
case Token::BIT_AND:
__ and_(right, left, Operand(right));
break;
case Token::BIT_XOR:
__ eor(right, left, Operand(right));
break;
default:
UNREACHABLE();
}
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::EmitBinaryOp(Token::Value op,
OverwriteMode mode) {
__ pop(r1);
TypeRecordingBinaryOpStub stub(op, mode);
EmitCallIC(stub.GetCode(), NULL);
context()->Plug(r0);
}
void FullCodeGenerator::EmitAssignment(Expression* expr, int bailout_ast_id) {
// Invalid left-hand sides are rewritten to have a 'throw
// ReferenceError' on the left-hand side.
if (!expr->IsValidLeftHandSide()) {
VisitForEffect(expr);
return;
}
// Left-hand side can only be a property, a global or a (parameter or local)
// slot. Variables with rewrite to .arguments are treated as KEYED_PROPERTY.
enum LhsKind { VARIABLE, NAMED_PROPERTY, KEYED_PROPERTY };
LhsKind assign_type = VARIABLE;
Property* prop = expr->AsProperty();
if (prop != NULL) {
assign_type = (prop->key()->IsPropertyName())
? NAMED_PROPERTY
: KEYED_PROPERTY;
}
switch (assign_type) {
case VARIABLE: {
Variable* var = expr->AsVariableProxy()->var();
EffectContext context(this);
EmitVariableAssignment(var, Token::ASSIGN);
break;
}
case NAMED_PROPERTY: {
__ push(r0); // Preserve value.
VisitForAccumulatorValue(prop->obj());
__ mov(r1, r0);
__ pop(r0); // Restore value.
__ mov(r2, Operand(prop->key()->AsLiteral()->handle()));
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->StoreIC_Initialize_Strict()
: isolate()->builtins()->StoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
break;
}
case KEYED_PROPERTY: {
__ push(r0); // Preserve value.
if (prop->is_synthetic()) {
ASSERT(prop->obj()->AsVariableProxy() != NULL);
ASSERT(prop->key()->AsLiteral() != NULL);
{ AccumulatorValueContext for_object(this);
EmitVariableLoad(prop->obj()->AsVariableProxy()->var());
}
__ mov(r2, r0);
__ mov(r1, Operand(prop->key()->AsLiteral()->handle()));
} else {
VisitForStackValue(prop->obj());
VisitForAccumulatorValue(prop->key());
__ mov(r1, r0);
__ pop(r2);
}
__ pop(r0); // Restore value.
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->KeyedStoreIC_Initialize_Strict()
: isolate()->builtins()->KeyedStoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
break;
}
}
PrepareForBailoutForId(bailout_ast_id, TOS_REG);
context()->Plug(r0);
}
void FullCodeGenerator::EmitVariableAssignment(Variable* var,
Token::Value op) {
// Left-hand sides that rewrite to explicit property accesses do not reach
// here.
ASSERT(var != NULL);
ASSERT(var->is_global() || var->AsSlot() != NULL);
if (var->is_global()) {
ASSERT(!var->is_this());
// Assignment to a global variable. Use inline caching for the
// assignment. Right-hand-side value is passed in r0, variable name in
// r2, and the global object in r1.
__ mov(r2, Operand(var->name()));
__ ldr(r1, GlobalObjectOperand());
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->StoreIC_Initialize_Strict()
: isolate()->builtins()->StoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET_CONTEXT);
} else if (op == Token::INIT_CONST) {
// Like var declarations, const declarations are hoisted to function
// scope. However, unlike var initializers, const initializers are able
// to drill a hole to that function context, even from inside a 'with'
// context. We thus bypass the normal static scope lookup.
Slot* slot = var->AsSlot();
Label skip;
switch (slot->type()) {
case Slot::PARAMETER:
// No const parameters.
UNREACHABLE();
break;
case Slot::LOCAL:
// Detect const reinitialization by checking for the hole value.
__ ldr(r1, MemOperand(fp, SlotOffset(slot)));
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ cmp(r1, ip);
__ b(ne, &skip);
__ str(result_register(), MemOperand(fp, SlotOffset(slot)));
break;
case Slot::CONTEXT: {
__ ldr(r1, ContextOperand(cp, Context::FCONTEXT_INDEX));
__ ldr(r2, ContextOperand(r1, slot->index()));
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ cmp(r2, ip);
__ b(ne, &skip);
__ str(r0, ContextOperand(r1, slot->index()));
int offset = Context::SlotOffset(slot->index());
__ mov(r3, r0); // Preserve the stored value in r0.
__ RecordWrite(r1, Operand(offset), r3, r2);
break;
}
case Slot::LOOKUP:
__ push(r0);
__ mov(r0, Operand(slot->var()->name()));
__ Push(cp, r0); // Context and name.
__ CallRuntime(Runtime::kInitializeConstContextSlot, 3);
break;
}
__ bind(&skip);
} else if (var->mode() != Variable::CONST) {
// Perform the assignment for non-const variables. Const assignments
// are simply skipped.
Slot* slot = var->AsSlot();
switch (slot->type()) {
case Slot::PARAMETER:
case Slot::LOCAL:
// Perform the assignment.
__ str(result_register(), MemOperand(fp, SlotOffset(slot)));
break;
case Slot::CONTEXT: {
MemOperand target = EmitSlotSearch(slot, r1);
// Perform the assignment and issue the write barrier.
__ str(result_register(), target);
// RecordWrite may destroy all its register arguments.
__ mov(r3, result_register());
int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
__ RecordWrite(r1, Operand(offset), r2, r3);
break;
}
case Slot::LOOKUP:
// Call the runtime for the assignment.
__ push(r0); // Value.
__ mov(r1, Operand(slot->var()->name()));
__ mov(r0, Operand(Smi::FromInt(strict_mode_flag())));
__ Push(cp, r1, r0); // Context, name, strict mode.
__ CallRuntime(Runtime::kStoreContextSlot, 4);
break;
}
}
}
void FullCodeGenerator::EmitNamedPropertyAssignment(Assignment* expr) {
// Assignment to a property, using a named store IC.
Property* prop = expr->target()->AsProperty();
ASSERT(prop != NULL);
ASSERT(prop->key()->AsLiteral() != NULL);
// If the assignment starts a block of assignments to the same object,
// change to slow case to avoid the quadratic behavior of repeatedly
// adding fast properties.
if (expr->starts_initialization_block()) {
__ push(result_register());
__ ldr(ip, MemOperand(sp, kPointerSize)); // Receiver is now under value.
__ push(ip);
__ CallRuntime(Runtime::kToSlowProperties, 1);
__ pop(result_register());
}
// Record source code position before IC call.
SetSourcePosition(expr->position());
__ mov(r2, Operand(prop->key()->AsLiteral()->handle()));
// Load receiver to r1. Leave a copy in the stack if needed for turning the
// receiver into fast case.
if (expr->ends_initialization_block()) {
__ ldr(r1, MemOperand(sp));
} else {
__ pop(r1);
}
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->StoreIC_Initialize_Strict()
: isolate()->builtins()->StoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
// If the assignment ends an initialization block, revert to fast case.
if (expr->ends_initialization_block()) {
__ push(r0); // Result of assignment, saved even if not needed.
// Receiver is under the result value.
__ ldr(ip, MemOperand(sp, kPointerSize));
__ push(ip);
__ CallRuntime(Runtime::kToFastProperties, 1);
__ pop(r0);
__ Drop(1);
}
PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
context()->Plug(r0);
}
void FullCodeGenerator::EmitKeyedPropertyAssignment(Assignment* expr) {
// Assignment to a property, using a keyed store IC.
// If the assignment starts a block of assignments to the same object,
// change to slow case to avoid the quadratic behavior of repeatedly
// adding fast properties.
if (expr->starts_initialization_block()) {
__ push(result_register());
// Receiver is now under the key and value.
__ ldr(ip, MemOperand(sp, 2 * kPointerSize));
__ push(ip);
__ CallRuntime(Runtime::kToSlowProperties, 1);
__ pop(result_register());
}
// Record source code position before IC call.
SetSourcePosition(expr->position());
__ pop(r1); // Key.
// Load receiver to r2. Leave a copy in the stack if needed for turning the
// receiver into fast case.
if (expr->ends_initialization_block()) {
__ ldr(r2, MemOperand(sp));
} else {
__ pop(r2);
}
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->KeyedStoreIC_Initialize_Strict()
: isolate()->builtins()->KeyedStoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
// If the assignment ends an initialization block, revert to fast case.
if (expr->ends_initialization_block()) {
__ push(r0); // Result of assignment, saved even if not needed.
// Receiver is under the result value.
__ ldr(ip, MemOperand(sp, kPointerSize));
__ push(ip);
__ CallRuntime(Runtime::kToFastProperties, 1);
__ pop(r0);
__ Drop(1);
}
PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
context()->Plug(r0);
}
void FullCodeGenerator::VisitProperty(Property* expr) {
Comment cmnt(masm_, "[ Property");
Expression* key = expr->key();
if (key->IsPropertyName()) {
VisitForAccumulatorValue(expr->obj());
EmitNamedPropertyLoad(expr);
context()->Plug(r0);
} else {
VisitForStackValue(expr->obj());
VisitForAccumulatorValue(expr->key());
__ pop(r1);
EmitKeyedPropertyLoad(expr);
context()->Plug(r0);
}
}
void FullCodeGenerator::EmitCallWithIC(Call* expr,
Handle<Object> name,
RelocInfo::Mode mode) {
// Code common for calls using the IC.
ZoneList<Expression*>* args = expr->arguments();
int arg_count = args->length();
{ PreservePositionScope scope(masm()->positions_recorder());
for (int i = 0; i < arg_count; i++) {
VisitForStackValue(args->at(i));
}
__ mov(r2, Operand(name));
}
// Record source position for debugger.
SetSourcePosition(expr->position());
// Call the IC initialization code.
InLoopFlag in_loop = (loop_depth() > 0) ? IN_LOOP : NOT_IN_LOOP;
Handle<Code> ic =
isolate()->stub_cache()->ComputeCallInitialize(arg_count, in_loop);
EmitCallIC(ic, mode);
RecordJSReturnSite(expr);
// Restore context register.
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
context()->Plug(r0);
}
void FullCodeGenerator::EmitKeyedCallWithIC(Call* expr,
Expression* key,
RelocInfo::Mode mode) {
// Load the key.
VisitForAccumulatorValue(key);
// Swap the name of the function and the receiver on the stack to follow
// the calling convention for call ICs.
__ pop(r1);
__ push(r0);
__ push(r1);
// Code common for calls using the IC.
ZoneList<Expression*>* args = expr->arguments();
int arg_count = args->length();
{ PreservePositionScope scope(masm()->positions_recorder());
for (int i = 0; i < arg_count; i++) {
VisitForStackValue(args->at(i));
}
}
// Record source position for debugger.
SetSourcePosition(expr->position());
// Call the IC initialization code.
InLoopFlag in_loop = (loop_depth() > 0) ? IN_LOOP : NOT_IN_LOOP;
Handle<Code> ic =
isolate()->stub_cache()->ComputeKeyedCallInitialize(arg_count, in_loop);
__ ldr(r2, MemOperand(sp, (arg_count + 1) * kPointerSize)); // Key.
EmitCallIC(ic, mode);
RecordJSReturnSite(expr);
// Restore context register.
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
context()->DropAndPlug(1, r0); // Drop the key still on the stack.
}
void FullCodeGenerator::EmitCallWithStub(Call* expr) {
// Code common for calls using the call stub.
ZoneList<Expression*>* args = expr->arguments();
int arg_count = args->length();
{ PreservePositionScope scope(masm()->positions_recorder());
for (int i = 0; i < arg_count; i++) {
VisitForStackValue(args->at(i));
}
}
// Record source position for debugger.
SetSourcePosition(expr->position());
InLoopFlag in_loop = (loop_depth() > 0) ? IN_LOOP : NOT_IN_LOOP;
CallFunctionStub stub(arg_count, in_loop, RECEIVER_MIGHT_BE_VALUE);
__ CallStub(&stub);
RecordJSReturnSite(expr);
// Restore context register.
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
context()->DropAndPlug(1, r0);
}
void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
int arg_count) {
// Push copy of the first argument or undefined if it doesn't exist.
if (arg_count > 0) {
__ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
} else {
__ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
}
__ push(r1);
// Push the receiver of the enclosing function and do runtime call.
__ ldr(r1, MemOperand(fp, (2 + scope()->num_parameters()) * kPointerSize));
__ push(r1);
// Push the strict mode flag.
__ mov(r1, Operand(Smi::FromInt(strict_mode_flag())));
__ push(r1);
__ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
? Runtime::kResolvePossiblyDirectEvalNoLookup
: Runtime::kResolvePossiblyDirectEval, 4);
}
void FullCodeGenerator::VisitCall(Call* expr) {
#ifdef DEBUG
// We want to verify that RecordJSReturnSite gets called on all paths
// through this function. Avoid early returns.
expr->return_is_recorded_ = false;
#endif
Comment cmnt(masm_, "[ Call");
Expression* fun = expr->expression();
Variable* var = fun->AsVariableProxy()->AsVariable();
if (var != NULL && var->is_possibly_eval()) {
// In a call to eval, we first call %ResolvePossiblyDirectEval to
// resolve the function we need to call and the receiver of the
// call. Then we call the resolved function using the given
// arguments.
ZoneList<Expression*>* args = expr->arguments();
int arg_count = args->length();
{ PreservePositionScope pos_scope(masm()->positions_recorder());
VisitForStackValue(fun);
__ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
__ push(r2); // Reserved receiver slot.
// Push the arguments.
for (int i = 0; i < arg_count; i++) {
VisitForStackValue(args->at(i));
}
// If we know that eval can only be shadowed by eval-introduced
// variables we attempt to load the global eval function directly
// in generated code. If we succeed, there is no need to perform a
// context lookup in the runtime system.
Label done;
if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) {
Label slow;
EmitLoadGlobalSlotCheckExtensions(var->AsSlot(),
NOT_INSIDE_TYPEOF,
&slow);
// Push the function and resolve eval.
__ push(r0);
EmitResolvePossiblyDirectEval(SKIP_CONTEXT_LOOKUP, arg_count);
__ jmp(&done);
__ bind(&slow);
}
// Push copy of the function (found below the arguments) and
// resolve eval.
__ ldr(r1, MemOperand(sp, (arg_count + 1) * kPointerSize));
__ push(r1);
EmitResolvePossiblyDirectEval(PERFORM_CONTEXT_LOOKUP, arg_count);
if (done.is_linked()) {
__ bind(&done);
}
// The runtime call returns a pair of values in r0 (function) and
// r1 (receiver). Touch up the stack with the right values.
__ str(r0, MemOperand(sp, (arg_count + 1) * kPointerSize));
__ str(r1, MemOperand(sp, arg_count * kPointerSize));
}
// Record source position for debugger.
SetSourcePosition(expr->position());
InLoopFlag in_loop = (loop_depth() > 0) ? IN_LOOP : NOT_IN_LOOP;
CallFunctionStub stub(arg_count, in_loop, RECEIVER_MIGHT_BE_VALUE);
__ CallStub(&stub);
RecordJSReturnSite(expr);
// Restore context register.
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
context()->DropAndPlug(1, r0);
} else if (var != NULL && !var->is_this() && var->is_global()) {
// Push global object as receiver for the call IC.
__ ldr(r0, GlobalObjectOperand());
__ push(r0);
EmitCallWithIC(expr, var->name(), RelocInfo::CODE_TARGET_CONTEXT);
} else if (var != NULL && var->AsSlot() != NULL &&
var->AsSlot()->type() == Slot::LOOKUP) {
// Call to a lookup slot (dynamically introduced variable).
Label slow, done;
{ PreservePositionScope scope(masm()->positions_recorder());
// Generate code for loading from variables potentially shadowed
// by eval-introduced variables.
EmitDynamicLoadFromSlotFastCase(var->AsSlot(),
NOT_INSIDE_TYPEOF,
&slow,
&done);
}
__ bind(&slow);
// Call the runtime to find the function to call (returned in r0)
// and the object holding it (returned in edx).
__ push(context_register());
__ mov(r2, Operand(var->name()));
__ push(r2);
__ CallRuntime(Runtime::kLoadContextSlot, 2);
__ Push(r0, r1); // Function, receiver.
// If fast case code has been generated, emit code to push the
// function and receiver and have the slow path jump around this
// code.
if (done.is_linked()) {
Label call;
__ b(&call);
__ bind(&done);
// Push function.
__ push(r0);
// Push global receiver.
__ ldr(r1, GlobalObjectOperand());
__ ldr(r1, FieldMemOperand(r1, GlobalObject::kGlobalReceiverOffset));
__ push(r1);
__ bind(&call);
}
EmitCallWithStub(expr);
} else if (fun->AsProperty() != NULL) {
// Call to an object property.
Property* prop = fun->AsProperty();
Literal* key = prop->key()->AsLiteral();
if (key != NULL && key->handle()->IsSymbol()) {
// Call to a named property, use call IC.
{ PreservePositionScope scope(masm()->positions_recorder());
VisitForStackValue(prop->obj());
}
EmitCallWithIC(expr, key->handle(), RelocInfo::CODE_TARGET);
} else {
// Call to a keyed property.
// For a synthetic property use keyed load IC followed by function call,
// for a regular property use keyed CallIC.
if (prop->is_synthetic()) {
// Do not visit the object and key subexpressions (they are shared
// by all occurrences of the same rewritten parameter).
ASSERT(prop->obj()->AsVariableProxy() != NULL);
ASSERT(prop->obj()->AsVariableProxy()->var()->AsSlot() != NULL);
Slot* slot = prop->obj()->AsVariableProxy()->var()->AsSlot();
MemOperand operand = EmitSlotSearch(slot, r1);
__ ldr(r1, operand);
ASSERT(prop->key()->AsLiteral() != NULL);
ASSERT(prop->key()->AsLiteral()->handle()->IsSmi());
__ mov(r0, Operand(prop->key()->AsLiteral()->handle()));
// Record source code position for IC call.
SetSourcePosition(prop->position());
Handle<Code> ic = isolate()->builtins()->KeyedLoadIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
__ ldr(r1, GlobalObjectOperand());
__ ldr(r1, FieldMemOperand(r1, GlobalObject::kGlobalReceiverOffset));
__ Push(r0, r1); // Function, receiver.
EmitCallWithStub(expr);
} else {
{ PreservePositionScope scope(masm()->positions_recorder());
VisitForStackValue(prop->obj());
}
EmitKeyedCallWithIC(expr, prop->key(), RelocInfo::CODE_TARGET);
}
}
} else {
{ PreservePositionScope scope(masm()->positions_recorder());
VisitForStackValue(fun);
}
// Load global receiver object.
__ ldr(r1, GlobalObjectOperand());
__ ldr(r1, FieldMemOperand(r1, GlobalObject::kGlobalReceiverOffset));
__ push(r1);
// Emit function call.
EmitCallWithStub(expr);
}
#ifdef DEBUG
// RecordJSReturnSite should have been called.
ASSERT(expr->return_is_recorded_);
#endif
}
void FullCodeGenerator::VisitCallNew(CallNew* expr) {
Comment cmnt(masm_, "[ CallNew");
// According to ECMA-262, section 11.2.2, page 44, the function
// expression in new calls must be evaluated before the
// arguments.
// Push constructor on the stack. If it's not a function it's used as
// receiver for CALL_NON_FUNCTION, otherwise the value on the stack is
// ignored.
VisitForStackValue(expr->expression());
// Push the arguments ("left-to-right") on the stack.
ZoneList<Expression*>* args = expr->arguments();
int arg_count = args->length();
for (int i = 0; i < arg_count; i++) {
VisitForStackValue(args->at(i));
}
// Call the construct call builtin that handles allocation and
// constructor invocation.
SetSourcePosition(expr->position());
// Load function and argument count into r1 and r0.
__ mov(r0, Operand(arg_count));
__ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
Handle<Code> construct_builtin =
isolate()->builtins()->JSConstructCall();
__ Call(construct_builtin, RelocInfo::CONSTRUCT_CALL);
context()->Plug(r0);
}
void FullCodeGenerator::EmitIsSmi(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
__ tst(r0, Operand(kSmiTagMask));
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsNonNegativeSmi(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
__ tst(r0, Operand(kSmiTagMask | 0x80000000));
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsObject(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ JumpIfSmi(r0, if_false);
__ LoadRoot(ip, Heap::kNullValueRootIndex);
__ cmp(r0, ip);
__ b(eq, if_true);
__ ldr(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
// Undetectable objects behave like undefined when tested with typeof.
__ ldrb(r1, FieldMemOperand(r2, Map::kBitFieldOffset));
__ tst(r1, Operand(1 << Map::kIsUndetectable));
__ b(ne, if_false);
__ ldrb(r1, FieldMemOperand(r2, Map::kInstanceTypeOffset));
__ cmp(r1, Operand(FIRST_JS_OBJECT_TYPE));
__ b(lt, if_false);
__ cmp(r1, Operand(LAST_JS_OBJECT_TYPE));
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(le, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsSpecObject(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ JumpIfSmi(r0, if_false);
__ CompareObjectType(r0, r1, r1, FIRST_JS_OBJECT_TYPE);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(ge, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsUndetectableObject(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ JumpIfSmi(r0, if_false);
__ ldr(r1, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldrb(r1, FieldMemOperand(r1, Map::kBitFieldOffset));
__ tst(r1, Operand(1 << Map::kIsUndetectable));
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(ne, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
if (FLAG_debug_code) __ AbortIfSmi(r0);
__ ldr(r1, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldrb(ip, FieldMemOperand(r1, Map::kBitField2Offset));
__ tst(ip, Operand(1 << Map::kStringWrapperSafeForDefaultValueOf));
__ b(ne, if_true);
// Check for fast case object. Generate false result for slow case object.
__ ldr(r2, FieldMemOperand(r0, JSObject::kPropertiesOffset));
__ ldr(r2, FieldMemOperand(r2, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kHashTableMapRootIndex);
__ cmp(r2, ip);
__ b(eq, if_false);
// Look for valueOf symbol in the descriptor array, and indicate false if
// found. The type is not checked, so if it is a transition it is a false
// negative.
__ ldr(r4, FieldMemOperand(r1, Map::kInstanceDescriptorsOffset));
__ ldr(r3, FieldMemOperand(r4, FixedArray::kLengthOffset));
// r4: descriptor array
// r3: length of descriptor array
// Calculate the end of the descriptor array.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize == 1);
STATIC_ASSERT(kPointerSize == 4);
__ add(r2, r4, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ add(r2, r2, Operand(r3, LSL, kPointerSizeLog2 - kSmiTagSize));
// Calculate location of the first key name.
__ add(r4,
r4,
Operand(FixedArray::kHeaderSize - kHeapObjectTag +
DescriptorArray::kFirstIndex * kPointerSize));
// Loop through all the keys in the descriptor array. If one of these is the
// symbol valueOf the result is false.
Label entry, loop;
// The use of ip to store the valueOf symbol asumes that it is not otherwise
// used in the loop below.
__ mov(ip, Operand(FACTORY->value_of_symbol()));
__ jmp(&entry);
__ bind(&loop);
__ ldr(r3, MemOperand(r4, 0));
__ cmp(r3, ip);
__ b(eq, if_false);
__ add(r4, r4, Operand(kPointerSize));
__ bind(&entry);
__ cmp(r4, Operand(r2));
__ b(ne, &loop);
// If a valueOf property is not found on the object check that it's
// prototype is the un-modified String prototype. If not result is false.
__ ldr(r2, FieldMemOperand(r1, Map::kPrototypeOffset));
__ tst(r2, Operand(kSmiTagMask));
__ b(eq, if_false);
__ ldr(r2, FieldMemOperand(r2, HeapObject::kMapOffset));
__ ldr(r3, ContextOperand(cp, Context::GLOBAL_INDEX));
__ ldr(r3, FieldMemOperand(r3, GlobalObject::kGlobalContextOffset));
__ ldr(r3, ContextOperand(r3, Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX));
__ cmp(r2, r3);
__ b(ne, if_false);
// Set the bit in the map to indicate that it has been checked safe for
// default valueOf and set true result.
__ ldrb(r2, FieldMemOperand(r4, Map::kBitField2Offset));
__ orr(r2, r2, Operand(1 << Map::kStringWrapperSafeForDefaultValueOf));
__ strb(r2, FieldMemOperand(r4, Map::kBitField2Offset));
__ jmp(if_true);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsFunction(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ JumpIfSmi(r0, if_false);
__ CompareObjectType(r0, r1, r1, JS_FUNCTION_TYPE);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsArray(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ JumpIfSmi(r0, if_false);
__ CompareObjectType(r0, r1, r1, JS_ARRAY_TYPE);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsRegExp(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ JumpIfSmi(r0, if_false);
__ CompareObjectType(r0, r1, r1, JS_REGEXP_TYPE);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitIsConstructCall(ZoneList<Expression*>* args) {
ASSERT(args->length() == 0);
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
// Get the frame pointer for the calling frame.
__ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
// Skip the arguments adaptor frame if it exists.
Label check_frame_marker;
__ ldr(r1, MemOperand(r2, StandardFrameConstants::kContextOffset));
__ cmp(r1, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ b(ne, &check_frame_marker);
__ ldr(r2, MemOperand(r2, StandardFrameConstants::kCallerFPOffset));
// Check the marker in the calling frame.
__ bind(&check_frame_marker);
__ ldr(r1, MemOperand(r2, StandardFrameConstants::kMarkerOffset));
__ cmp(r1, Operand(Smi::FromInt(StackFrame::CONSTRUCT)));
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitObjectEquals(ZoneList<Expression*>* args) {
ASSERT(args->length() == 2);
// Load the two objects into registers and perform the comparison.
VisitForStackValue(args->at(0));
VisitForAccumulatorValue(args->at(1));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ pop(r1);
__ cmp(r0, r1);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitArguments(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
// ArgumentsAccessStub expects the key in edx and the formal
// parameter count in r0.
VisitForAccumulatorValue(args->at(0));
__ mov(r1, r0);
__ mov(r0, Operand(Smi::FromInt(scope()->num_parameters())));
ArgumentsAccessStub stub(ArgumentsAccessStub::READ_ELEMENT);
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitArgumentsLength(ZoneList<Expression*>* args) {
ASSERT(args->length() == 0);
Label exit;
// Get the number of formal parameters.
__ mov(r0, Operand(Smi::FromInt(scope()->num_parameters())));
// Check if the calling frame is an arguments adaptor frame.
__ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ldr(r3, MemOperand(r2, StandardFrameConstants::kContextOffset));
__ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ b(ne, &exit);
// Arguments adaptor case: Read the arguments length from the
// adaptor frame.
__ ldr(r0, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ bind(&exit);
context()->Plug(r0);
}
void FullCodeGenerator::EmitClassOf(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
Label done, null, function, non_function_constructor;
VisitForAccumulatorValue(args->at(0));
// If the object is a smi, we return null.
__ JumpIfSmi(r0, &null);
// Check that the object is a JS object but take special care of JS
// functions to make sure they have 'Function' as their class.
__ CompareObjectType(r0, r0, r1, FIRST_JS_OBJECT_TYPE); // Map is now in r0.
__ b(lt, &null);
// As long as JS_FUNCTION_TYPE is the last instance type and it is
// right after LAST_JS_OBJECT_TYPE, we can avoid checking for
// LAST_JS_OBJECT_TYPE.
ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1);
__ cmp(r1, Operand(JS_FUNCTION_TYPE));
__ b(eq, &function);
// Check if the constructor in the map is a function.
__ ldr(r0, FieldMemOperand(r0, Map::kConstructorOffset));
__ CompareObjectType(r0, r1, r1, JS_FUNCTION_TYPE);
__ b(ne, &non_function_constructor);
// r0 now contains the constructor function. Grab the
// instance class name from there.
__ ldr(r0, FieldMemOperand(r0, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r0, FieldMemOperand(r0, SharedFunctionInfo::kInstanceClassNameOffset));
__ b(&done);
// Functions have class 'Function'.
__ bind(&function);
__ LoadRoot(r0, Heap::kfunction_class_symbolRootIndex);
__ jmp(&done);
// Objects with a non-function constructor have class 'Object'.
__ bind(&non_function_constructor);
__ LoadRoot(r0, Heap::kfunction_class_symbolRootIndex);
__ jmp(&done);
// Non-JS objects have class null.
__ bind(&null);
__ LoadRoot(r0, Heap::kNullValueRootIndex);
// All done.
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::EmitLog(ZoneList<Expression*>* args) {
// Conditionally generate a log call.
// Args:
// 0 (literal string): The type of logging (corresponds to the flags).
// This is used to determine whether or not to generate the log call.
// 1 (string): Format string. Access the string at argument index 2
// with '%2s' (see Logger::LogRuntime for all the formats).
// 2 (array): Arguments to the format string.
ASSERT_EQ(args->length(), 3);
#ifdef ENABLE_LOGGING_AND_PROFILING
if (CodeGenerator::ShouldGenerateLog(args->at(0))) {
VisitForStackValue(args->at(1));
VisitForStackValue(args->at(2));
__ CallRuntime(Runtime::kLog, 2);
}
#endif
// Finally, we're expected to leave a value on the top of the stack.
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
context()->Plug(r0);
}
void FullCodeGenerator::EmitRandomHeapNumber(ZoneList<Expression*>* args) {
ASSERT(args->length() == 0);
Label slow_allocate_heapnumber;
Label heapnumber_allocated;
__ LoadRoot(r6, Heap::kHeapNumberMapRootIndex);
__ AllocateHeapNumber(r4, r1, r2, r6, &slow_allocate_heapnumber);
__ jmp(&heapnumber_allocated);
__ bind(&slow_allocate_heapnumber);
// Allocate a heap number.
__ CallRuntime(Runtime::kNumberAlloc, 0);
__ mov(r4, Operand(r0));
__ bind(&heapnumber_allocated);
// Convert 32 random bits in r0 to 0.(32 random bits) in a double
// by computing:
// ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
if (CpuFeatures::IsSupported(VFP3)) {
__ PrepareCallCFunction(1, r0);
__ mov(r0, Operand(ExternalReference::isolate_address()));
__ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
CpuFeatures::Scope scope(VFP3);
// 0x41300000 is the top half of 1.0 x 2^20 as a double.
// Create this constant using mov/orr to avoid PC relative load.
__ mov(r1, Operand(0x41000000));
__ orr(r1, r1, Operand(0x300000));
// Move 0x41300000xxxxxxxx (x = random bits) to VFP.
__ vmov(d7, r0, r1);
// Move 0x4130000000000000 to VFP.
__ mov(r0, Operand(0, RelocInfo::NONE));
__ vmov(d8, r0, r1);
// Subtract and store the result in the heap number.
__ vsub(d7, d7, d8);
__ sub(r0, r4, Operand(kHeapObjectTag));
__ vstr(d7, r0, HeapNumber::kValueOffset);
__ mov(r0, r4);
} else {
__ PrepareCallCFunction(2, r0);
__ mov(r0, Operand(r4));
__ mov(r1, Operand(ExternalReference::isolate_address()));
__ CallCFunction(
ExternalReference::fill_heap_number_with_random_function(isolate()), 2);
}
context()->Plug(r0);
}
void FullCodeGenerator::EmitSubString(ZoneList<Expression*>* args) {
// Load the arguments on the stack and call the stub.
SubStringStub stub;
ASSERT(args->length() == 3);
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
VisitForStackValue(args->at(2));
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitRegExpExec(ZoneList<Expression*>* args) {
// Load the arguments on the stack and call the stub.
RegExpExecStub stub;
ASSERT(args->length() == 4);
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
VisitForStackValue(args->at(2));
VisitForStackValue(args->at(3));
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitValueOf(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0)); // Load the object.
Label done;
// If the object is a smi return the object.
__ JumpIfSmi(r0, &done);
// If the object is not a value type, return the object.
__ CompareObjectType(r0, r1, r1, JS_VALUE_TYPE);
__ b(ne, &done);
__ ldr(r0, FieldMemOperand(r0, JSValue::kValueOffset));
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::EmitMathPow(ZoneList<Expression*>* args) {
// Load the arguments on the stack and call the runtime function.
ASSERT(args->length() == 2);
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
MathPowStub stub;
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitSetValueOf(ZoneList<Expression*>* args) {
ASSERT(args->length() == 2);
VisitForStackValue(args->at(0)); // Load the object.
VisitForAccumulatorValue(args->at(1)); // Load the value.
__ pop(r1); // r0 = value. r1 = object.
Label done;
// If the object is a smi, return the value.
__ JumpIfSmi(r1, &done);
// If the object is not a value type, return the value.
__ CompareObjectType(r1, r2, r2, JS_VALUE_TYPE);
__ b(ne, &done);
// Store the value.
__ str(r0, FieldMemOperand(r1, JSValue::kValueOffset));
// Update the write barrier. Save the value as it will be
// overwritten by the write barrier code and is needed afterward.
__ RecordWrite(r1, Operand(JSValue::kValueOffset - kHeapObjectTag), r2, r3);
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::EmitNumberToString(ZoneList<Expression*>* args) {
ASSERT_EQ(args->length(), 1);
// Load the argument on the stack and call the stub.
VisitForStackValue(args->at(0));
NumberToStringStub stub;
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitStringCharFromCode(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
Label done;
StringCharFromCodeGenerator generator(r0, r1);
generator.GenerateFast(masm_);
__ jmp(&done);
NopRuntimeCallHelper call_helper;
generator.GenerateSlow(masm_, call_helper);
__ bind(&done);
context()->Plug(r1);
}
void FullCodeGenerator::EmitStringCharCodeAt(ZoneList<Expression*>* args) {
ASSERT(args->length() == 2);
VisitForStackValue(args->at(0));
VisitForAccumulatorValue(args->at(1));
Register object = r1;
Register index = r0;
Register scratch = r2;
Register result = r3;
__ pop(object);
Label need_conversion;
Label index_out_of_range;
Label done;
StringCharCodeAtGenerator generator(object,
index,
scratch,
result,
&need_conversion,
&need_conversion,
&index_out_of_range,
STRING_INDEX_IS_NUMBER);
generator.GenerateFast(masm_);
__ jmp(&done);
__ bind(&index_out_of_range);
// When the index is out of range, the spec requires us to return
// NaN.
__ LoadRoot(result, Heap::kNanValueRootIndex);
__ jmp(&done);
__ bind(&need_conversion);
// Load the undefined value into the result register, which will
// trigger conversion.
__ LoadRoot(result, Heap::kUndefinedValueRootIndex);
__ jmp(&done);
NopRuntimeCallHelper call_helper;
generator.GenerateSlow(masm_, call_helper);
__ bind(&done);
context()->Plug(result);
}
void FullCodeGenerator::EmitStringCharAt(ZoneList<Expression*>* args) {
ASSERT(args->length() == 2);
VisitForStackValue(args->at(0));
VisitForAccumulatorValue(args->at(1));
Register object = r1;
Register index = r0;
Register scratch1 = r2;
Register scratch2 = r3;
Register result = r0;
__ pop(object);
Label need_conversion;
Label index_out_of_range;
Label done;
StringCharAtGenerator generator(object,
index,
scratch1,
scratch2,
result,
&need_conversion,
&need_conversion,
&index_out_of_range,
STRING_INDEX_IS_NUMBER);
generator.GenerateFast(masm_);
__ jmp(&done);
__ bind(&index_out_of_range);
// When the index is out of range, the spec requires us to return
// the empty string.
__ LoadRoot(result, Heap::kEmptyStringRootIndex);
__ jmp(&done);
__ bind(&need_conversion);
// Move smi zero into the result register, which will trigger
// conversion.
__ mov(result, Operand(Smi::FromInt(0)));
__ jmp(&done);
NopRuntimeCallHelper call_helper;
generator.GenerateSlow(masm_, call_helper);
__ bind(&done);
context()->Plug(result);
}
void FullCodeGenerator::EmitStringAdd(ZoneList<Expression*>* args) {
ASSERT_EQ(2, args->length());
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
StringAddStub stub(NO_STRING_ADD_FLAGS);
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitStringCompare(ZoneList<Expression*>* args) {
ASSERT_EQ(2, args->length());
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
StringCompareStub stub;
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitMathSin(ZoneList<Expression*>* args) {
// Load the argument on the stack and call the stub.
TranscendentalCacheStub stub(TranscendentalCache::SIN,
TranscendentalCacheStub::TAGGED);
ASSERT(args->length() == 1);
VisitForStackValue(args->at(0));
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitMathCos(ZoneList<Expression*>* args) {
// Load the argument on the stack and call the stub.
TranscendentalCacheStub stub(TranscendentalCache::COS,
TranscendentalCacheStub::TAGGED);
ASSERT(args->length() == 1);
VisitForStackValue(args->at(0));
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitMathLog(ZoneList<Expression*>* args) {
// Load the argument on the stack and call the stub.
TranscendentalCacheStub stub(TranscendentalCache::LOG,
TranscendentalCacheStub::TAGGED);
ASSERT(args->length() == 1);
VisitForStackValue(args->at(0));
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitMathSqrt(ZoneList<Expression*>* args) {
// Load the argument on the stack and call the runtime function.
ASSERT(args->length() == 1);
VisitForStackValue(args->at(0));
__ CallRuntime(Runtime::kMath_sqrt, 1);
context()->Plug(r0);
}
void FullCodeGenerator::EmitCallFunction(ZoneList<Expression*>* args) {
ASSERT(args->length() >= 2);
int arg_count = args->length() - 2; // For receiver and function.
VisitForStackValue(args->at(0)); // Receiver.
for (int i = 0; i < arg_count; i++) {
VisitForStackValue(args->at(i + 1));
}
VisitForAccumulatorValue(args->at(arg_count + 1)); // Function.
// InvokeFunction requires function in r1. Move it in there.
if (!result_register().is(r1)) __ mov(r1, result_register());
ParameterCount count(arg_count);
__ InvokeFunction(r1, count, CALL_FUNCTION);
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
context()->Plug(r0);
}
void FullCodeGenerator::EmitRegExpConstructResult(ZoneList<Expression*>* args) {
RegExpConstructResultStub stub;
ASSERT(args->length() == 3);
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
VisitForStackValue(args->at(2));
__ CallStub(&stub);
context()->Plug(r0);
}
void FullCodeGenerator::EmitSwapElements(ZoneList<Expression*>* args) {
ASSERT(args->length() == 3);
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
VisitForStackValue(args->at(2));
Label done;
Label slow_case;
Register object = r0;
Register index1 = r1;
Register index2 = r2;
Register elements = r3;
Register scratch1 = r4;
Register scratch2 = r5;
__ ldr(object, MemOperand(sp, 2 * kPointerSize));
// Fetch the map and check if array is in fast case.
// Check that object doesn't require security checks and
// has no indexed interceptor.
__ CompareObjectType(object, scratch1, scratch2, JS_ARRAY_TYPE);
__ b(ne, &slow_case);
// Map is now in scratch1.
__ ldrb(scratch2, FieldMemOperand(scratch1, Map::kBitFieldOffset));
__ tst(scratch2, Operand(KeyedLoadIC::kSlowCaseBitFieldMask));
__ b(ne, &slow_case);
// Check the object's elements are in fast case and writable.
__ ldr(elements, FieldMemOperand(object, JSObject::kElementsOffset));
__ ldr(scratch1, FieldMemOperand(elements, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kFixedArrayMapRootIndex);
__ cmp(scratch1, ip);
__ b(ne, &slow_case);
// Check that both indices are smis.
__ ldr(index1, MemOperand(sp, 1 * kPointerSize));
__ ldr(index2, MemOperand(sp, 0));
__ JumpIfNotBothSmi(index1, index2, &slow_case);
// Check that both indices are valid.
__ ldr(scratch1, FieldMemOperand(object, JSArray::kLengthOffset));
__ cmp(scratch1, index1);
__ cmp(scratch1, index2, hi);
__ b(ls, &slow_case);
// Bring the address of the elements into index1 and index2.
__ add(scratch1, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ add(index1,
scratch1,
Operand(index1, LSL, kPointerSizeLog2 - kSmiTagSize));
__ add(index2,
scratch1,
Operand(index2, LSL, kPointerSizeLog2 - kSmiTagSize));
// Swap elements.
__ ldr(scratch1, MemOperand(index1, 0));
__ ldr(scratch2, MemOperand(index2, 0));
__ str(scratch1, MemOperand(index2, 0));
__ str(scratch2, MemOperand(index1, 0));
Label new_space;
__ InNewSpace(elements, scratch1, eq, &new_space);
// Possible optimization: do a check that both values are Smis
// (or them and test against Smi mask.)
__ mov(scratch1, elements);
__ RecordWriteHelper(elements, index1, scratch2);
__ RecordWriteHelper(scratch1, index2, scratch2); // scratch1 holds elements.
__ bind(&new_space);
// We are done. Drop elements from the stack, and return undefined.
__ Drop(3);
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
__ jmp(&done);
__ bind(&slow_case);
__ CallRuntime(Runtime::kSwapElements, 3);
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::EmitGetFromCache(ZoneList<Expression*>* args) {
ASSERT_EQ(2, args->length());
ASSERT_NE(NULL, args->at(0)->AsLiteral());
int cache_id = Smi::cast(*(args->at(0)->AsLiteral()->handle()))->value();
Handle<FixedArray> jsfunction_result_caches(
isolate()->global_context()->jsfunction_result_caches());
if (jsfunction_result_caches->length() <= cache_id) {
__ Abort("Attempt to use undefined cache.");
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
context()->Plug(r0);
return;
}
VisitForAccumulatorValue(args->at(1));
Register key = r0;
Register cache = r1;
__ ldr(cache, ContextOperand(cp, Context::GLOBAL_INDEX));
__ ldr(cache, FieldMemOperand(cache, GlobalObject::kGlobalContextOffset));
__ ldr(cache, ContextOperand(cache, Context::JSFUNCTION_RESULT_CACHES_INDEX));
__ ldr(cache,
FieldMemOperand(cache, FixedArray::OffsetOfElementAt(cache_id)));
Label done, not_found;
// tmp now holds finger offset as a smi.
ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
__ ldr(r2, FieldMemOperand(cache, JSFunctionResultCache::kFingerOffset));
// r2 now holds finger offset as a smi.
__ add(r3, cache, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
// r3 now points to the start of fixed array elements.
__ ldr(r2, MemOperand(r3, r2, LSL, kPointerSizeLog2 - kSmiTagSize, PreIndex));
// Note side effect of PreIndex: r3 now points to the key of the pair.
__ cmp(key, r2);
__ b(ne, ¬_found);
__ ldr(r0, MemOperand(r3, kPointerSize));
__ b(&done);
__ bind(¬_found);
// Call runtime to perform the lookup.
__ Push(cache, key);
__ CallRuntime(Runtime::kGetFromCache, 2);
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::EmitIsRegExpEquivalent(ZoneList<Expression*>* args) {
ASSERT_EQ(2, args->length());
Register right = r0;
Register left = r1;
Register tmp = r2;
Register tmp2 = r3;
VisitForStackValue(args->at(0));
VisitForAccumulatorValue(args->at(1));
__ pop(left);
Label done, fail, ok;
__ cmp(left, Operand(right));
__ b(eq, &ok);
// Fail if either is a non-HeapObject.
__ and_(tmp, left, Operand(right));
__ tst(tmp, Operand(kSmiTagMask));
__ b(eq, &fail);
__ ldr(tmp, FieldMemOperand(left, HeapObject::kMapOffset));
__ ldrb(tmp2, FieldMemOperand(tmp, Map::kInstanceTypeOffset));
__ cmp(tmp2, Operand(JS_REGEXP_TYPE));
__ b(ne, &fail);
__ ldr(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ cmp(tmp, Operand(tmp2));
__ b(ne, &fail);
__ ldr(tmp, FieldMemOperand(left, JSRegExp::kDataOffset));
__ ldr(tmp2, FieldMemOperand(right, JSRegExp::kDataOffset));
__ cmp(tmp, tmp2);
__ b(eq, &ok);
__ bind(&fail);
__ LoadRoot(r0, Heap::kFalseValueRootIndex);
__ jmp(&done);
__ bind(&ok);
__ LoadRoot(r0, Heap::kTrueValueRootIndex);
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::EmitHasCachedArrayIndex(ZoneList<Expression*>* args) {
VisitForAccumulatorValue(args->at(0));
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
__ ldr(r0, FieldMemOperand(r0, String::kHashFieldOffset));
__ tst(r0, Operand(String::kContainsCachedArrayIndexMask));
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
Split(eq, if_true, if_false, fall_through);
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::EmitGetCachedArrayIndex(ZoneList<Expression*>* args) {
ASSERT(args->length() == 1);
VisitForAccumulatorValue(args->at(0));
if (FLAG_debug_code) {
__ AbortIfNotString(r0);
}
__ ldr(r0, FieldMemOperand(r0, String::kHashFieldOffset));
__ IndexFromHash(r0, r0);
context()->Plug(r0);
}
void FullCodeGenerator::EmitFastAsciiArrayJoin(ZoneList<Expression*>* args) {
Label bailout, done, one_char_separator, long_separator,
non_trivial_array, not_size_one_array, loop,
empty_separator_loop, one_char_separator_loop,
one_char_separator_loop_entry, long_separator_loop;
ASSERT(args->length() == 2);
VisitForStackValue(args->at(1));
VisitForAccumulatorValue(args->at(0));
// All aliases of the same register have disjoint lifetimes.
Register array = r0;
Register elements = no_reg; // Will be r0.
Register result = no_reg; // Will be r0.
Register separator = r1;
Register array_length = r2;
Register result_pos = no_reg; // Will be r2
Register string_length = r3;
Register string = r4;
Register element = r5;
Register elements_end = r6;
Register scratch1 = r7;
Register scratch2 = r9;
// Separator operand is on the stack.
__ pop(separator);
// Check that the array is a JSArray.
__ JumpIfSmi(array, &bailout);
__ CompareObjectType(array, scratch1, scratch2, JS_ARRAY_TYPE);
__ b(ne, &bailout);
// Check that the array has fast elements.
__ ldrb(scratch2, FieldMemOperand(scratch1, Map::kBitField2Offset));
__ tst(scratch2, Operand(1 << Map::kHasFastElements));
__ b(eq, &bailout);
// If the array has length zero, return the empty string.
__ ldr(array_length, FieldMemOperand(array, JSArray::kLengthOffset));
__ SmiUntag(array_length, SetCC);
__ b(ne, &non_trivial_array);
__ LoadRoot(r0, Heap::kEmptyStringRootIndex);
__ b(&done);
__ bind(&non_trivial_array);
// Get the FixedArray containing array's elements.
elements = array;
__ ldr(elements, FieldMemOperand(array, JSArray::kElementsOffset));
array = no_reg; // End of array's live range.
// Check that all array elements are sequential ASCII strings, and
// accumulate the sum of their lengths, as a smi-encoded value.
__ mov(string_length, Operand(0));
__ add(element,
elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ add(elements_end, element, Operand(array_length, LSL, kPointerSizeLog2));
// Loop condition: while (element < elements_end).
// Live values in registers:
// elements: Fixed array of strings.
// array_length: Length of the fixed array of strings (not smi)
// separator: Separator string
// string_length: Accumulated sum of string lengths (smi).
// element: Current array element.
// elements_end: Array end.
if (FLAG_debug_code) {
__ cmp(array_length, Operand(0));
__ Assert(gt, "No empty arrays here in EmitFastAsciiArrayJoin");
}
__ bind(&loop);
__ ldr(string, MemOperand(element, kPointerSize, PostIndex));
__ JumpIfSmi(string, &bailout);
__ ldr(scratch1, FieldMemOperand(string, HeapObject::kMapOffset));
__ ldrb(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
__ JumpIfInstanceTypeIsNotSequentialAscii(scratch1, scratch2, &bailout);
__ ldr(scratch1, FieldMemOperand(string, SeqAsciiString::kLengthOffset));
__ add(string_length, string_length, Operand(scratch1));
__ b(vs, &bailout);
__ cmp(element, elements_end);
__ b(lt, &loop);
// If array_length is 1, return elements[0], a string.
__ cmp(array_length, Operand(1));
__ b(ne, ¬_size_one_array);
__ ldr(r0, FieldMemOperand(elements, FixedArray::kHeaderSize));
__ b(&done);
__ bind(¬_size_one_array);
// Live values in registers:
// separator: Separator string
// array_length: Length of the array.
// string_length: Sum of string lengths (smi).
// elements: FixedArray of strings.
// Check that the separator is a flat ASCII string.
__ JumpIfSmi(separator, &bailout);
__ ldr(scratch1, FieldMemOperand(separator, HeapObject::kMapOffset));
__ ldrb(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
__ JumpIfInstanceTypeIsNotSequentialAscii(scratch1, scratch2, &bailout);
// Add (separator length times array_length) - separator length to the
// string_length to get the length of the result string. array_length is not
// smi but the other values are, so the result is a smi
__ ldr(scratch1, FieldMemOperand(separator, SeqAsciiString::kLengthOffset));
__ sub(string_length, string_length, Operand(scratch1));
__ smull(scratch2, ip, array_length, scratch1);
// Check for smi overflow. No overflow if higher 33 bits of 64-bit result are
// zero.
__ cmp(ip, Operand(0));
__ b(ne, &bailout);
__ tst(scratch2, Operand(0x80000000));
__ b(ne, &bailout);
__ add(string_length, string_length, Operand(scratch2));
__ b(vs, &bailout);
__ SmiUntag(string_length);
// Get first element in the array to free up the elements register to be used
// for the result.
__ add(element,
elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
result = elements; // End of live range for elements.
elements = no_reg;
// Live values in registers:
// element: First array element
// separator: Separator string
// string_length: Length of result string (not smi)
// array_length: Length of the array.
__ AllocateAsciiString(result,
string_length,
scratch1,
scratch2,
elements_end,
&bailout);
// Prepare for looping. Set up elements_end to end of the array. Set
// result_pos to the position of the result where to write the first
// character.
__ add(elements_end, element, Operand(array_length, LSL, kPointerSizeLog2));
result_pos = array_length; // End of live range for array_length.
array_length = no_reg;
__ add(result_pos,
result,
Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// Check the length of the separator.
__ ldr(scratch1, FieldMemOperand(separator, SeqAsciiString::kLengthOffset));
__ cmp(scratch1, Operand(Smi::FromInt(1)));
__ b(eq, &one_char_separator);
__ b(gt, &long_separator);
// Empty separator case
__ bind(&empty_separator_loop);
// Live values in registers:
// result_pos: the position to which we are currently copying characters.
// element: Current array element.
// elements_end: Array end.
// Copy next array element to the result.
__ ldr(string, MemOperand(element, kPointerSize, PostIndex));
__ ldr(string_length, FieldMemOperand(string, String::kLengthOffset));
__ SmiUntag(string_length);
__ add(string, string, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ CopyBytes(string, result_pos, string_length, scratch1);
__ cmp(element, elements_end);
__ b(lt, &empty_separator_loop); // End while (element < elements_end).
ASSERT(result.is(r0));
__ b(&done);
// One-character separator case
__ bind(&one_char_separator);
// Replace separator with its ascii character value.
__ ldrb(separator, FieldMemOperand(separator, SeqAsciiString::kHeaderSize));
// Jump into the loop after the code that copies the separator, so the first
// element is not preceded by a separator
__ jmp(&one_char_separator_loop_entry);
__ bind(&one_char_separator_loop);
// Live values in registers:
// result_pos: the position to which we are currently copying characters.
// element: Current array element.
// elements_end: Array end.
// separator: Single separator ascii char (in lower byte).
// Copy the separator character to the result.
__ strb(separator, MemOperand(result_pos, 1, PostIndex));
// Copy next array element to the result.
__ bind(&one_char_separator_loop_entry);
__ ldr(string, MemOperand(element, kPointerSize, PostIndex));
__ ldr(string_length, FieldMemOperand(string, String::kLengthOffset));
__ SmiUntag(string_length);
__ add(string, string, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ CopyBytes(string, result_pos, string_length, scratch1);
__ cmp(element, elements_end);
__ b(lt, &one_char_separator_loop); // End while (element < elements_end).
ASSERT(result.is(r0));
__ b(&done);
// Long separator case (separator is more than one character). Entry is at the
// label long_separator below.
__ bind(&long_separator_loop);
// Live values in registers:
// result_pos: the position to which we are currently copying characters.
// element: Current array element.
// elements_end: Array end.
// separator: Separator string.
// Copy the separator to the result.
__ ldr(string_length, FieldMemOperand(separator, String::kLengthOffset));
__ SmiUntag(string_length);
__ add(string,
separator,
Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ CopyBytes(string, result_pos, string_length, scratch1);
__ bind(&long_separator);
__ ldr(string, MemOperand(element, kPointerSize, PostIndex));
__ ldr(string_length, FieldMemOperand(string, String::kLengthOffset));
__ SmiUntag(string_length);
__ add(string, string, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ CopyBytes(string, result_pos, string_length, scratch1);
__ cmp(element, elements_end);
__ b(lt, &long_separator_loop); // End while (element < elements_end).
ASSERT(result.is(r0));
__ b(&done);
__ bind(&bailout);
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
__ bind(&done);
context()->Plug(r0);
}
void FullCodeGenerator::VisitCallRuntime(CallRuntime* expr) {
Handle<String> name = expr->name();
if (name->length() > 0 && name->Get(0) == '_') {
Comment cmnt(masm_, "[ InlineRuntimeCall");
EmitInlineRuntimeCall(expr);
return;
}
Comment cmnt(masm_, "[ CallRuntime");
ZoneList<Expression*>* args = expr->arguments();
if (expr->is_jsruntime()) {
// Prepare for calling JS runtime function.
__ ldr(r0, GlobalObjectOperand());
__ ldr(r0, FieldMemOperand(r0, GlobalObject::kBuiltinsOffset));
__ push(r0);
}
// Push the arguments ("left-to-right").
int arg_count = args->length();
for (int i = 0; i < arg_count; i++) {
VisitForStackValue(args->at(i));
}
if (expr->is_jsruntime()) {
// Call the JS runtime function.
__ mov(r2, Operand(expr->name()));
Handle<Code> ic =
isolate()->stub_cache()->ComputeCallInitialize(arg_count, NOT_IN_LOOP);
EmitCallIC(ic, RelocInfo::CODE_TARGET);
// Restore context register.
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
} else {
// Call the C runtime function.
__ CallRuntime(expr->function(), arg_count);
}
context()->Plug(r0);
}
void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
switch (expr->op()) {
case Token::DELETE: {
Comment cmnt(masm_, "[ UnaryOperation (DELETE)");
Property* prop = expr->expression()->AsProperty();
Variable* var = expr->expression()->AsVariableProxy()->AsVariable();
if (prop != NULL) {
if (prop->is_synthetic()) {
// Result of deleting parameters is false, even when they rewrite
// to accesses on the arguments object.
context()->Plug(false);
} else {
VisitForStackValue(prop->obj());
VisitForStackValue(prop->key());
__ mov(r1, Operand(Smi::FromInt(strict_mode_flag())));
__ push(r1);
__ InvokeBuiltin(Builtins::DELETE, CALL_JS);
context()->Plug(r0);
}
} else if (var != NULL) {
// Delete of an unqualified identifier is disallowed in strict mode
// but "delete this" is.
ASSERT(strict_mode_flag() == kNonStrictMode || var->is_this());
if (var->is_global()) {
__ ldr(r2, GlobalObjectOperand());
__ mov(r1, Operand(var->name()));
__ mov(r0, Operand(Smi::FromInt(kNonStrictMode)));
__ Push(r2, r1, r0);
__ InvokeBuiltin(Builtins::DELETE, CALL_JS);
context()->Plug(r0);
} else if (var->AsSlot() != NULL &&
var->AsSlot()->type() != Slot::LOOKUP) {
// Result of deleting non-global, non-dynamic variables is false.
// The subexpression does not have side effects.
context()->Plug(false);
} else {
// Non-global variable. Call the runtime to try to delete from the
// context where the variable was introduced.
__ push(context_register());
__ mov(r2, Operand(var->name()));
__ push(r2);
__ CallRuntime(Runtime::kDeleteContextSlot, 2);
context()->Plug(r0);
}
} else {
// Result of deleting non-property, non-variable reference is true.
// The subexpression may have side effects.
VisitForEffect(expr->expression());
context()->Plug(true);
}
break;
}
case Token::VOID: {
Comment cmnt(masm_, "[ UnaryOperation (VOID)");
VisitForEffect(expr->expression());
context()->Plug(Heap::kUndefinedValueRootIndex);
break;
}
case Token::NOT: {
Comment cmnt(masm_, "[ UnaryOperation (NOT)");
if (context()->IsEffect()) {
// Unary NOT has no side effects so it's only necessary to visit the
// subexpression. Match the optimizing compiler by not branching.
VisitForEffect(expr->expression());
} else {
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
// Notice that the labels are swapped.
context()->PrepareTest(&materialize_true, &materialize_false,
&if_false, &if_true, &fall_through);
if (context()->IsTest()) ForwardBailoutToChild(expr);
VisitForControl(expr->expression(), if_true, if_false, fall_through);
context()->Plug(if_false, if_true); // Labels swapped.
}
break;
}
case Token::TYPEOF: {
Comment cmnt(masm_, "[ UnaryOperation (TYPEOF)");
{ StackValueContext context(this);
VisitForTypeofValue(expr->expression());
}
__ CallRuntime(Runtime::kTypeof, 1);
context()->Plug(r0);
break;
}
case Token::ADD: {
Comment cmt(masm_, "[ UnaryOperation (ADD)");
VisitForAccumulatorValue(expr->expression());
Label no_conversion;
__ tst(result_register(), Operand(kSmiTagMask));
__ b(eq, &no_conversion);
ToNumberStub convert_stub;
__ CallStub(&convert_stub);
__ bind(&no_conversion);
context()->Plug(result_register());
break;
}
case Token::SUB: {
Comment cmt(masm_, "[ UnaryOperation (SUB)");
bool can_overwrite = expr->expression()->ResultOverwriteAllowed();
UnaryOverwriteMode overwrite =
can_overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE;
GenericUnaryOpStub stub(Token::SUB, overwrite, NO_UNARY_FLAGS);
// GenericUnaryOpStub expects the argument to be in the
// accumulator register r0.
VisitForAccumulatorValue(expr->expression());
__ CallStub(&stub);
context()->Plug(r0);
break;
}
case Token::BIT_NOT: {
Comment cmt(masm_, "[ UnaryOperation (BIT_NOT)");
// The generic unary operation stub expects the argument to be
// in the accumulator register r0.
VisitForAccumulatorValue(expr->expression());
Label done;
bool inline_smi_code = ShouldInlineSmiCase(expr->op());
if (inline_smi_code) {
Label call_stub;
__ JumpIfNotSmi(r0, &call_stub);
__ mvn(r0, Operand(r0));
// Bit-clear inverted smi-tag.
__ bic(r0, r0, Operand(kSmiTagMask));
__ b(&done);
__ bind(&call_stub);
}
bool overwrite = expr->expression()->ResultOverwriteAllowed();
UnaryOpFlags flags = inline_smi_code
? NO_UNARY_SMI_CODE_IN_STUB
: NO_UNARY_FLAGS;
UnaryOverwriteMode mode =
overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE;
GenericUnaryOpStub stub(Token::BIT_NOT, mode, flags);
__ CallStub(&stub);
__ bind(&done);
context()->Plug(r0);
break;
}
default:
UNREACHABLE();
}
}
void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
Comment cmnt(masm_, "[ CountOperation");
SetSourcePosition(expr->position());
// Invalid left-hand sides are rewritten to have a 'throw ReferenceError'
// as the left-hand side.
if (!expr->expression()->IsValidLeftHandSide()) {
VisitForEffect(expr->expression());
return;
}
// Expression can only be a property, a global or a (parameter or local)
// slot. Variables with rewrite to .arguments are treated as KEYED_PROPERTY.
enum LhsKind { VARIABLE, NAMED_PROPERTY, KEYED_PROPERTY };
LhsKind assign_type = VARIABLE;
Property* prop = expr->expression()->AsProperty();
// In case of a property we use the uninitialized expression context
// of the key to detect a named property.
if (prop != NULL) {
assign_type =
(prop->key()->IsPropertyName()) ? NAMED_PROPERTY : KEYED_PROPERTY;
}
// Evaluate expression and get value.
if (assign_type == VARIABLE) {
ASSERT(expr->expression()->AsVariableProxy()->var() != NULL);
AccumulatorValueContext context(this);
EmitVariableLoad(expr->expression()->AsVariableProxy()->var());
} else {
// Reserve space for result of postfix operation.
if (expr->is_postfix() && !context()->IsEffect()) {
__ mov(ip, Operand(Smi::FromInt(0)));
__ push(ip);
}
if (assign_type == NAMED_PROPERTY) {
// Put the object both on the stack and in the accumulator.
VisitForAccumulatorValue(prop->obj());
__ push(r0);
EmitNamedPropertyLoad(prop);
} else {
if (prop->is_arguments_access()) {
VariableProxy* obj_proxy = prop->obj()->AsVariableProxy();
__ ldr(r0, EmitSlotSearch(obj_proxy->var()->AsSlot(), r0));
__ push(r0);
__ mov(r0, Operand(prop->key()->AsLiteral()->handle()));
} else {
VisitForStackValue(prop->obj());
VisitForAccumulatorValue(prop->key());
}
__ ldr(r1, MemOperand(sp, 0));
__ push(r0);
EmitKeyedPropertyLoad(prop);
}
}
// We need a second deoptimization point after loading the value
// in case evaluating the property load my have a side effect.
if (assign_type == VARIABLE) {
PrepareForBailout(expr->expression(), TOS_REG);
} else {
PrepareForBailout(expr->increment(), TOS_REG);
}
// Call ToNumber only if operand is not a smi.
Label no_conversion;
__ JumpIfSmi(r0, &no_conversion);
ToNumberStub convert_stub;
__ CallStub(&convert_stub);
__ bind(&no_conversion);
// Save result for postfix expressions.
if (expr->is_postfix()) {
if (!context()->IsEffect()) {
// Save the result on the stack. If we have a named or keyed property
// we store the result under the receiver that is currently on top
// of the stack.
switch (assign_type) {
case VARIABLE:
__ push(r0);
break;
case NAMED_PROPERTY:
__ str(r0, MemOperand(sp, kPointerSize));
break;
case KEYED_PROPERTY:
__ str(r0, MemOperand(sp, 2 * kPointerSize));
break;
}
}
}
// Inline smi case if we are in a loop.
Label stub_call, done;
JumpPatchSite patch_site(masm_);
int count_value = expr->op() == Token::INC ? 1 : -1;
if (ShouldInlineSmiCase(expr->op())) {
__ add(r0, r0, Operand(Smi::FromInt(count_value)), SetCC);
__ b(vs, &stub_call);
// We could eliminate this smi check if we split the code at
// the first smi check before calling ToNumber.
patch_site.EmitJumpIfSmi(r0, &done);
__ bind(&stub_call);
// Call stub. Undo operation first.
__ sub(r0, r0, Operand(Smi::FromInt(count_value)));
}
__ mov(r1, Operand(Smi::FromInt(count_value)));
// Record position before stub call.
SetSourcePosition(expr->position());
TypeRecordingBinaryOpStub stub(Token::ADD, NO_OVERWRITE);
EmitCallIC(stub.GetCode(), &patch_site);
__ bind(&done);
// Store the value returned in r0.
switch (assign_type) {
case VARIABLE:
if (expr->is_postfix()) {
{ EffectContext context(this);
EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
Token::ASSIGN);
PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
context.Plug(r0);
}
// For all contexts except EffectConstant We have the result on
// top of the stack.
if (!context()->IsEffect()) {
context()->PlugTOS();
}
} else {
EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
Token::ASSIGN);
PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
context()->Plug(r0);
}
break;
case NAMED_PROPERTY: {
__ mov(r2, Operand(prop->key()->AsLiteral()->handle()));
__ pop(r1);
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->StoreIC_Initialize_Strict()
: isolate()->builtins()->StoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
if (expr->is_postfix()) {
if (!context()->IsEffect()) {
context()->PlugTOS();
}
} else {
context()->Plug(r0);
}
break;
}
case KEYED_PROPERTY: {
__ pop(r1); // Key.
__ pop(r2); // Receiver.
Handle<Code> ic = is_strict_mode()
? isolate()->builtins()->KeyedStoreIC_Initialize_Strict()
: isolate()->builtins()->KeyedStoreIC_Initialize();
EmitCallIC(ic, RelocInfo::CODE_TARGET);
PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
if (expr->is_postfix()) {
if (!context()->IsEffect()) {
context()->PlugTOS();
}
} else {
context()->Plug(r0);
}
break;
}
}
}
void FullCodeGenerator::VisitForTypeofValue(Expression* expr) {
ASSERT(!context()->IsEffect());
ASSERT(!context()->IsTest());
VariableProxy* proxy = expr->AsVariableProxy();
if (proxy != NULL && !proxy->var()->is_this() && proxy->var()->is_global()) {
Comment cmnt(masm_, "Global variable");
__ ldr(r0, GlobalObjectOperand());
__ mov(r2, Operand(proxy->name()));
Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
// Use a regular load, not a contextual load, to avoid a reference
// error.
EmitCallIC(ic, RelocInfo::CODE_TARGET);
PrepareForBailout(expr, TOS_REG);
context()->Plug(r0);
} else if (proxy != NULL &&
proxy->var()->AsSlot() != NULL &&
proxy->var()->AsSlot()->type() == Slot::LOOKUP) {
Label done, slow;
// Generate code for loading from variables potentially shadowed
// by eval-introduced variables.
Slot* slot = proxy->var()->AsSlot();
EmitDynamicLoadFromSlotFastCase(slot, INSIDE_TYPEOF, &slow, &done);
__ bind(&slow);
__ mov(r0, Operand(proxy->name()));
__ Push(cp, r0);
__ CallRuntime(Runtime::kLoadContextSlotNoReferenceError, 2);
PrepareForBailout(expr, TOS_REG);
__ bind(&done);
context()->Plug(r0);
} else {
// This expression cannot throw a reference error at the top level.
context()->HandleExpression(expr);
}
}
bool FullCodeGenerator::TryLiteralCompare(Token::Value op,
Expression* left,
Expression* right,
Label* if_true,
Label* if_false,
Label* fall_through) {
if (op != Token::EQ && op != Token::EQ_STRICT) return false;
// Check for the pattern: typeof <expression> == <string literal>.
Literal* right_literal = right->AsLiteral();
if (right_literal == NULL) return false;
Handle<Object> right_literal_value = right_literal->handle();
if (!right_literal_value->IsString()) return false;
UnaryOperation* left_unary = left->AsUnaryOperation();
if (left_unary == NULL || left_unary->op() != Token::TYPEOF) return false;
Handle<String> check = Handle<String>::cast(right_literal_value);
{ AccumulatorValueContext context(this);
VisitForTypeofValue(left_unary->expression());
}
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
if (check->Equals(isolate()->heap()->number_symbol())) {
__ JumpIfSmi(r0, if_true);
__ ldr(r0, FieldMemOperand(r0, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kHeapNumberMapRootIndex);
__ cmp(r0, ip);
Split(eq, if_true, if_false, fall_through);
} else if (check->Equals(isolate()->heap()->string_symbol())) {
__ JumpIfSmi(r0, if_false);
// Check for undetectable objects => false.
__ CompareObjectType(r0, r0, r1, FIRST_NONSTRING_TYPE);
__ b(ge, if_false);
__ ldrb(r1, FieldMemOperand(r0, Map::kBitFieldOffset));
__ tst(r1, Operand(1 << Map::kIsUndetectable));
Split(eq, if_true, if_false, fall_through);
} else if (check->Equals(isolate()->heap()->boolean_symbol())) {
__ CompareRoot(r0, Heap::kTrueValueRootIndex);
__ b(eq, if_true);
__ CompareRoot(r0, Heap::kFalseValueRootIndex);
Split(eq, if_true, if_false, fall_through);
} else if (check->Equals(isolate()->heap()->undefined_symbol())) {
__ CompareRoot(r0, Heap::kUndefinedValueRootIndex);
__ b(eq, if_true);
__ JumpIfSmi(r0, if_false);
// Check for undetectable objects => true.
__ ldr(r0, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldrb(r1, FieldMemOperand(r0, Map::kBitFieldOffset));
__ tst(r1, Operand(1 << Map::kIsUndetectable));
Split(ne, if_true, if_false, fall_through);
} else if (check->Equals(isolate()->heap()->function_symbol())) {
__ JumpIfSmi(r0, if_false);
__ CompareObjectType(r0, r1, r0, FIRST_FUNCTION_CLASS_TYPE);
Split(ge, if_true, if_false, fall_through);
} else if (check->Equals(isolate()->heap()->object_symbol())) {
__ JumpIfSmi(r0, if_false);
__ CompareRoot(r0, Heap::kNullValueRootIndex);
__ b(eq, if_true);
// Check for JS objects => true.
__ CompareObjectType(r0, r0, r1, FIRST_JS_OBJECT_TYPE);
__ b(lo, if_false);
__ CompareInstanceType(r0, r1, FIRST_FUNCTION_CLASS_TYPE);
__ b(hs, if_false);
// Check for undetectable objects => false.
__ ldrb(r1, FieldMemOperand(r0, Map::kBitFieldOffset));
__ tst(r1, Operand(1 << Map::kIsUndetectable));
Split(eq, if_true, if_false, fall_through);
} else {
if (if_false != fall_through) __ jmp(if_false);
}
return true;
}
void FullCodeGenerator::VisitCompareOperation(CompareOperation* expr) {
Comment cmnt(masm_, "[ CompareOperation");
SetSourcePosition(expr->position());
// Always perform the comparison for its control flow. Pack the result
// into the expression's context after the comparison is performed.
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
// First we try a fast inlined version of the compare when one of
// the operands is a literal.
Token::Value op = expr->op();
Expression* left = expr->left();
Expression* right = expr->right();
if (TryLiteralCompare(op, left, right, if_true, if_false, fall_through)) {
context()->Plug(if_true, if_false);
return;
}
VisitForStackValue(expr->left());
switch (op) {
case Token::IN:
VisitForStackValue(expr->right());
__ InvokeBuiltin(Builtins::IN, CALL_JS);
PrepareForBailoutBeforeSplit(TOS_REG, false, NULL, NULL);
__ LoadRoot(ip, Heap::kTrueValueRootIndex);
__ cmp(r0, ip);
Split(eq, if_true, if_false, fall_through);
break;
case Token::INSTANCEOF: {
VisitForStackValue(expr->right());
InstanceofStub stub(InstanceofStub::kNoFlags);
__ CallStub(&stub);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
// The stub returns 0 for true.
__ tst(r0, r0);
Split(eq, if_true, if_false, fall_through);
break;
}
default: {
VisitForAccumulatorValue(expr->right());
Condition cond = eq;
bool strict = false;
switch (op) {
case Token::EQ_STRICT:
strict = true;
// Fall through
case Token::EQ:
cond = eq;
__ pop(r1);
break;
case Token::LT:
cond = lt;
__ pop(r1);
break;
case Token::GT:
// Reverse left and right sides to obtain ECMA-262 conversion order.
cond = lt;
__ mov(r1, result_register());
__ pop(r0);
break;
case Token::LTE:
// Reverse left and right sides to obtain ECMA-262 conversion order.
cond = ge;
__ mov(r1, result_register());
__ pop(r0);
break;
case Token::GTE:
cond = ge;
__ pop(r1);
break;
case Token::IN:
case Token::INSTANCEOF:
default:
UNREACHABLE();
}
bool inline_smi_code = ShouldInlineSmiCase(op);
JumpPatchSite patch_site(masm_);
if (inline_smi_code) {
Label slow_case;
__ orr(r2, r0, Operand(r1));
patch_site.EmitJumpIfNotSmi(r2, &slow_case);
__ cmp(r1, r0);
Split(cond, if_true, if_false, NULL);
__ bind(&slow_case);
}
// Record position and call the compare IC.
SetSourcePosition(expr->position());
Handle<Code> ic = CompareIC::GetUninitialized(op);
EmitCallIC(ic, &patch_site);
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
__ cmp(r0, Operand(0));
Split(cond, if_true, if_false, fall_through);
}
}
// Convert the result of the comparison into one expected for this
// expression's context.
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::VisitCompareToNull(CompareToNull* expr) {
Comment cmnt(masm_, "[ CompareToNull");
Label materialize_true, materialize_false;
Label* if_true = NULL;
Label* if_false = NULL;
Label* fall_through = NULL;
context()->PrepareTest(&materialize_true, &materialize_false,
&if_true, &if_false, &fall_through);
VisitForAccumulatorValue(expr->expression());
PrepareForBailoutBeforeSplit(TOS_REG, true, if_true, if_false);
__ LoadRoot(r1, Heap::kNullValueRootIndex);
__ cmp(r0, r1);
if (expr->is_strict()) {
Split(eq, if_true, if_false, fall_through);
} else {
__ b(eq, if_true);
__ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
__ cmp(r0, r1);
__ b(eq, if_true);
__ tst(r0, Operand(kSmiTagMask));
__ b(eq, if_false);
// It can be an undetectable object.
__ ldr(r1, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldrb(r1, FieldMemOperand(r1, Map::kBitFieldOffset));
__ and_(r1, r1, Operand(1 << Map::kIsUndetectable));
__ cmp(r1, Operand(1 << Map::kIsUndetectable));
Split(eq, if_true, if_false, fall_through);
}
context()->Plug(if_true, if_false);
}
void FullCodeGenerator::VisitThisFunction(ThisFunction* expr) {
__ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
context()->Plug(r0);
}
Register FullCodeGenerator::result_register() {
return r0;
}
Register FullCodeGenerator::context_register() {
return cp;
}
void FullCodeGenerator::EmitCallIC(Handle<Code> ic, RelocInfo::Mode mode) {
ASSERT(mode == RelocInfo::CODE_TARGET ||
mode == RelocInfo::CODE_TARGET_CONTEXT);
Counters* counters = isolate()->counters();
switch (ic->kind()) {
case Code::LOAD_IC:
__ IncrementCounter(counters->named_load_full(), 1, r1, r2);
break;
case Code::KEYED_LOAD_IC:
__ IncrementCounter(counters->keyed_load_full(), 1, r1, r2);
break;
case Code::STORE_IC:
__ IncrementCounter(counters->named_store_full(), 1, r1, r2);
break;
case Code::KEYED_STORE_IC:
__ IncrementCounter(counters->keyed_store_full(), 1, r1, r2);
default:
break;
}
__ Call(ic, mode);
}
void FullCodeGenerator::EmitCallIC(Handle<Code> ic, JumpPatchSite* patch_site) {
Counters* counters = isolate()->counters();
switch (ic->kind()) {
case Code::LOAD_IC:
__ IncrementCounter(counters->named_load_full(), 1, r1, r2);
break;
case Code::KEYED_LOAD_IC:
__ IncrementCounter(counters->keyed_load_full(), 1, r1, r2);
break;
case Code::STORE_IC:
__ IncrementCounter(counters->named_store_full(), 1, r1, r2);
break;
case Code::KEYED_STORE_IC:
__ IncrementCounter(counters->keyed_store_full(), 1, r1, r2);
default:
break;
}
__ Call(ic, RelocInfo::CODE_TARGET);
if (patch_site != NULL && patch_site->is_bound()) {
patch_site->EmitPatchInfo();
} else {
__ nop(); // Signals no inlined code.
}
}
void FullCodeGenerator::StoreToFrameField(int frame_offset, Register value) {
ASSERT_EQ(POINTER_SIZE_ALIGN(frame_offset), frame_offset);
__ str(value, MemOperand(fp, frame_offset));
}
void FullCodeGenerator::LoadContextField(Register dst, int context_index) {
__ ldr(dst, ContextOperand(cp, context_index));
}
// ----------------------------------------------------------------------------
// Non-local control flow support.
void FullCodeGenerator::EnterFinallyBlock() {
ASSERT(!result_register().is(r1));
// Store result register while executing finally block.
__ push(result_register());
// Cook return address in link register to stack (smi encoded Code* delta)
__ sub(r1, lr, Operand(masm_->CodeObject()));
ASSERT_EQ(1, kSmiTagSize + kSmiShiftSize);
ASSERT_EQ(0, kSmiTag);
__ add(r1, r1, Operand(r1)); // Convert to smi.
__ push(r1);
}
void FullCodeGenerator::ExitFinallyBlock() {
ASSERT(!result_register().is(r1));
// Restore result register from stack.
__ pop(r1);
// Uncook return address and return.
__ pop(result_register());
ASSERT_EQ(1, kSmiTagSize + kSmiShiftSize);
__ mov(r1, Operand(r1, ASR, 1)); // Un-smi-tag value.
__ add(pc, r1, Operand(masm_->CodeObject()));
}
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_ARM