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builtins-arm.cc
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builtins-arm.cc
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// Copyright 2012 the V8 project authors. All rights reserved.
// 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 "codegen.h"
#include "debug.h"
#include "deoptimizer.h"
#include "full-codegen.h"
#include "runtime.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm,
CFunctionId id,
BuiltinExtraArguments extra_args) {
// ----------- S t a t e -------------
// -- r0 : number of arguments excluding receiver
// -- r1 : called function (only guaranteed when
// extra_args requires it)
// -- cp : context
// -- sp[0] : last argument
// -- ...
// -- sp[4 * (argc - 1)] : first argument (argc == r0)
// -- sp[4 * argc] : receiver
// -----------------------------------
// Insert extra arguments.
int num_extra_args = 0;
if (extra_args == NEEDS_CALLED_FUNCTION) {
num_extra_args = 1;
__ push(r1);
} else {
ASSERT(extra_args == NO_EXTRA_ARGUMENTS);
}
// JumpToExternalReference expects r0 to contain the number of arguments
// including the receiver and the extra arguments.
__ add(r0, r0, Operand(num_extra_args + 1));
__ JumpToExternalReference(ExternalReference(id, masm->isolate()));
}
// Load the built-in InternalArray function from the current context.
static void GenerateLoadInternalArrayFunction(MacroAssembler* masm,
Register result) {
// Load the global context.
__ ldr(result, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ ldr(result,
FieldMemOperand(result, GlobalObject::kGlobalContextOffset));
// Load the InternalArray function from the global context.
__ ldr(result,
MemOperand(result,
Context::SlotOffset(
Context::INTERNAL_ARRAY_FUNCTION_INDEX)));
}
// Load the built-in Array function from the current context.
static void GenerateLoadArrayFunction(MacroAssembler* masm, Register result) {
// Load the global context.
__ ldr(result, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ ldr(result,
FieldMemOperand(result, GlobalObject::kGlobalContextOffset));
// Load the Array function from the global context.
__ ldr(result,
MemOperand(result,
Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
}
// Allocate an empty JSArray. The allocated array is put into the result
// register. An elements backing store is allocated with size initial_capacity
// and filled with the hole values.
static void AllocateEmptyJSArray(MacroAssembler* masm,
Register array_function,
Register result,
Register scratch1,
Register scratch2,
Register scratch3,
Label* gc_required) {
const int initial_capacity = JSArray::kPreallocatedArrayElements;
STATIC_ASSERT(initial_capacity >= 0);
__ LoadInitialArrayMap(array_function, scratch2, scratch1);
// Allocate the JSArray object together with space for a fixed array with the
// requested elements.
int size = JSArray::kSize;
if (initial_capacity > 0) {
size += FixedArray::SizeFor(initial_capacity);
}
__ AllocateInNewSpace(size,
result,
scratch2,
scratch3,
gc_required,
TAG_OBJECT);
// Allocated the JSArray. Now initialize the fields except for the elements
// array.
// result: JSObject
// scratch1: initial map
// scratch2: start of next object
__ str(scratch1, FieldMemOperand(result, JSObject::kMapOffset));
__ LoadRoot(scratch1, Heap::kEmptyFixedArrayRootIndex);
__ str(scratch1, FieldMemOperand(result, JSArray::kPropertiesOffset));
// Field JSArray::kElementsOffset is initialized later.
__ mov(scratch3, Operand(0, RelocInfo::NONE));
__ str(scratch3, FieldMemOperand(result, JSArray::kLengthOffset));
if (initial_capacity == 0) {
__ str(scratch1, FieldMemOperand(result, JSArray::kElementsOffset));
return;
}
// Calculate the location of the elements array and set elements array member
// of the JSArray.
// result: JSObject
// scratch2: start of next object
__ add(scratch1, result, Operand(JSArray::kSize));
__ str(scratch1, FieldMemOperand(result, JSArray::kElementsOffset));
// Clear the heap tag on the elements array.
__ sub(scratch1, scratch1, Operand(kHeapObjectTag));
// Initialize the FixedArray and fill it with holes. FixedArray length is
// stored as a smi.
// result: JSObject
// scratch1: elements array (untagged)
// scratch2: start of next object
__ LoadRoot(scratch3, Heap::kFixedArrayMapRootIndex);
STATIC_ASSERT(0 * kPointerSize == FixedArray::kMapOffset);
__ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex));
__ mov(scratch3, Operand(Smi::FromInt(initial_capacity)));
STATIC_ASSERT(1 * kPointerSize == FixedArray::kLengthOffset);
__ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex));
// Fill the FixedArray with the hole value. Inline the code if short.
STATIC_ASSERT(2 * kPointerSize == FixedArray::kHeaderSize);
__ LoadRoot(scratch3, Heap::kTheHoleValueRootIndex);
static const int kLoopUnfoldLimit = 4;
if (initial_capacity <= kLoopUnfoldLimit) {
for (int i = 0; i < initial_capacity; i++) {
__ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex));
}
} else {
Label loop, entry;
__ add(scratch2, scratch1, Operand(initial_capacity * kPointerSize));
__ b(&entry);
__ bind(&loop);
__ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex));
__ bind(&entry);
__ cmp(scratch1, scratch2);
__ b(lt, &loop);
}
}
// Allocate a JSArray with the number of elements stored in a register. The
// register array_function holds the built-in Array function and the register
// array_size holds the size of the array as a smi. The allocated array is put
// into the result register and beginning and end of the FixedArray elements
// storage is put into registers elements_array_storage and elements_array_end
// (see below for when that is not the case). If the parameter fill_with_holes
// is true the allocated elements backing store is filled with the hole values
// otherwise it is left uninitialized. When the backing store is filled the
// register elements_array_storage is scratched.
static void AllocateJSArray(MacroAssembler* masm,
Register array_function, // Array function.
Register array_size, // As a smi, cannot be 0.
Register result,
Register elements_array_storage,
Register elements_array_end,
Register scratch1,
Register scratch2,
bool fill_with_hole,
Label* gc_required) {
// Load the initial map from the array function.
__ LoadInitialArrayMap(array_function, scratch2, elements_array_storage);
if (FLAG_debug_code) { // Assert that array size is not zero.
__ tst(array_size, array_size);
__ Assert(ne, "array size is unexpectedly 0");
}
// Allocate the JSArray object together with space for a FixedArray with the
// requested number of elements.
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
__ mov(elements_array_end,
Operand((JSArray::kSize + FixedArray::kHeaderSize) / kPointerSize));
__ add(elements_array_end,
elements_array_end,
Operand(array_size, ASR, kSmiTagSize));
__ AllocateInNewSpace(
elements_array_end,
result,
scratch1,
scratch2,
gc_required,
static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
// Allocated the JSArray. Now initialize the fields except for the elements
// array.
// result: JSObject
// elements_array_storage: initial map
// array_size: size of array (smi)
__ str(elements_array_storage, FieldMemOperand(result, JSObject::kMapOffset));
__ LoadRoot(elements_array_storage, Heap::kEmptyFixedArrayRootIndex);
__ str(elements_array_storage,
FieldMemOperand(result, JSArray::kPropertiesOffset));
// Field JSArray::kElementsOffset is initialized later.
__ str(array_size, FieldMemOperand(result, JSArray::kLengthOffset));
// Calculate the location of the elements array and set elements array member
// of the JSArray.
// result: JSObject
// array_size: size of array (smi)
__ add(elements_array_storage, result, Operand(JSArray::kSize));
__ str(elements_array_storage,
FieldMemOperand(result, JSArray::kElementsOffset));
// Clear the heap tag on the elements array.
STATIC_ASSERT(kSmiTag == 0);
__ sub(elements_array_storage,
elements_array_storage,
Operand(kHeapObjectTag));
// Initialize the fixed array and fill it with holes. FixedArray length is
// stored as a smi.
// result: JSObject
// elements_array_storage: elements array (untagged)
// array_size: size of array (smi)
__ LoadRoot(scratch1, Heap::kFixedArrayMapRootIndex);
ASSERT_EQ(0 * kPointerSize, FixedArray::kMapOffset);
__ str(scratch1, MemOperand(elements_array_storage, kPointerSize, PostIndex));
STATIC_ASSERT(kSmiTag == 0);
ASSERT_EQ(1 * kPointerSize, FixedArray::kLengthOffset);
__ str(array_size,
MemOperand(elements_array_storage, kPointerSize, PostIndex));
// Calculate elements array and elements array end.
// result: JSObject
// elements_array_storage: elements array element storage
// array_size: smi-tagged size of elements array
STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize < kPointerSizeLog2);
__ add(elements_array_end,
elements_array_storage,
Operand(array_size, LSL, kPointerSizeLog2 - kSmiTagSize));
// Fill the allocated FixedArray with the hole value if requested.
// result: JSObject
// elements_array_storage: elements array element storage
// elements_array_end: start of next object
if (fill_with_hole) {
Label loop, entry;
__ LoadRoot(scratch1, Heap::kTheHoleValueRootIndex);
__ jmp(&entry);
__ bind(&loop);
__ str(scratch1,
MemOperand(elements_array_storage, kPointerSize, PostIndex));
__ bind(&entry);
__ cmp(elements_array_storage, elements_array_end);
__ b(lt, &loop);
}
}
// Create a new array for the built-in Array function. This function allocates
// the JSArray object and the FixedArray elements array and initializes these.
// If the Array cannot be constructed in native code the runtime is called. This
// function assumes the following state:
// r0: argc
// r1: constructor (built-in Array function)
// lr: return address
// sp[0]: last argument
// This function is used for both construct and normal calls of Array. The only
// difference between handling a construct call and a normal call is that for a
// construct call the constructor function in r1 needs to be preserved for
// entering the generic code. In both cases argc in r0 needs to be preserved.
// Both registers are preserved by this code so no need to differentiate between
// construct call and normal call.
static void ArrayNativeCode(MacroAssembler* masm,
Label* call_generic_code) {
Counters* counters = masm->isolate()->counters();
Label argc_one_or_more, argc_two_or_more, not_empty_array, empty_array,
has_non_smi_element, finish, cant_transition_map, not_double;
// Check for array construction with zero arguments or one.
__ cmp(r0, Operand(0, RelocInfo::NONE));
__ b(ne, &argc_one_or_more);
// Handle construction of an empty array.
__ bind(&empty_array);
AllocateEmptyJSArray(masm,
r1,
r2,
r3,
r4,
r5,
call_generic_code);
__ IncrementCounter(counters->array_function_native(), 1, r3, r4);
// Set up return value, remove receiver from stack and return.
__ mov(r0, r2);
__ add(sp, sp, Operand(kPointerSize));
__ Jump(lr);
// Check for one argument. Bail out if argument is not smi or if it is
// negative.
__ bind(&argc_one_or_more);
__ cmp(r0, Operand(1));
__ b(ne, &argc_two_or_more);
STATIC_ASSERT(kSmiTag == 0);
__ ldr(r2, MemOperand(sp)); // Get the argument from the stack.
__ tst(r2, r2);
__ b(ne, ¬_empty_array);
__ Drop(1); // Adjust stack.
__ mov(r0, Operand(0)); // Treat this as a call with argc of zero.
__ b(&empty_array);
__ bind(¬_empty_array);
__ and_(r3, r2, Operand(kIntptrSignBit | kSmiTagMask), SetCC);
__ b(ne, call_generic_code);
// Handle construction of an empty array of a certain size. Bail out if size
// is too large to actually allocate an elements array.
STATIC_ASSERT(kSmiTag == 0);
__ cmp(r2, Operand(JSObject::kInitialMaxFastElementArray << kSmiTagSize));
__ b(ge, call_generic_code);
// r0: argc
// r1: constructor
// r2: array_size (smi)
// sp[0]: argument
AllocateJSArray(masm,
r1,
r2,
r3,
r4,
r5,
r6,
r7,
true,
call_generic_code);
__ IncrementCounter(counters->array_function_native(), 1, r2, r4);
// Set up return value, remove receiver and argument from stack and return.
__ mov(r0, r3);
__ add(sp, sp, Operand(2 * kPointerSize));
__ Jump(lr);
// Handle construction of an array from a list of arguments.
__ bind(&argc_two_or_more);
__ mov(r2, Operand(r0, LSL, kSmiTagSize)); // Convet argc to a smi.
// r0: argc
// r1: constructor
// r2: array_size (smi)
// sp[0]: last argument
AllocateJSArray(masm,
r1,
r2,
r3,
r4,
r5,
r6,
r7,
false,
call_generic_code);
__ IncrementCounter(counters->array_function_native(), 1, r2, r6);
// Fill arguments as array elements. Copy from the top of the stack (last
// element) to the array backing store filling it backwards. Note:
// elements_array_end points after the backing store therefore PreIndex is
// used when filling the backing store.
// r0: argc
// r3: JSArray
// r4: elements_array storage start (untagged)
// r5: elements_array_end (untagged)
// sp[0]: last argument
Label loop, entry;
__ mov(r7, sp);
__ jmp(&entry);
__ bind(&loop);
__ ldr(r2, MemOperand(r7, kPointerSize, PostIndex));
if (FLAG_smi_only_arrays) {
__ JumpIfNotSmi(r2, &has_non_smi_element);
}
__ str(r2, MemOperand(r5, -kPointerSize, PreIndex));
__ bind(&entry);
__ cmp(r4, r5);
__ b(lt, &loop);
__ bind(&finish);
__ mov(sp, r7);
// Remove caller arguments and receiver from the stack, setup return value and
// return.
// r0: argc
// r3: JSArray
// sp[0]: receiver
__ add(sp, sp, Operand(kPointerSize));
__ mov(r0, r3);
__ Jump(lr);
__ bind(&has_non_smi_element);
// Double values are handled by the runtime.
__ CheckMap(
r2, r9, Heap::kHeapNumberMapRootIndex, ¬_double, DONT_DO_SMI_CHECK);
__ bind(&cant_transition_map);
__ UndoAllocationInNewSpace(r3, r4);
__ b(call_generic_code);
__ bind(¬_double);
// Transition FAST_SMI_ONLY_ELEMENTS to FAST_ELEMENTS.
// r3: JSArray
__ ldr(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
__ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
FAST_ELEMENTS,
r2,
r9,
&cant_transition_map);
__ str(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
__ RecordWriteField(r3,
HeapObject::kMapOffset,
r2,
r9,
kLRHasNotBeenSaved,
kDontSaveFPRegs,
EMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
Label loop2;
__ sub(r7, r7, Operand(kPointerSize));
__ bind(&loop2);
__ ldr(r2, MemOperand(r7, kPointerSize, PostIndex));
__ str(r2, MemOperand(r5, -kPointerSize, PreIndex));
__ cmp(r4, r5);
__ b(lt, &loop2);
__ b(&finish);
}
void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : number of arguments
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Label generic_array_code, one_or_more_arguments, two_or_more_arguments;
// Get the InternalArray function.
GenerateLoadInternalArrayFunction(masm, r1);
if (FLAG_debug_code) {
// Initial map for the builtin InternalArray functions should be maps.
__ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
__ tst(r2, Operand(kSmiTagMask));
__ Assert(ne, "Unexpected initial map for InternalArray function");
__ CompareObjectType(r2, r3, r4, MAP_TYPE);
__ Assert(eq, "Unexpected initial map for InternalArray function");
}
// Run the native code for the InternalArray function called as a normal
// function.
ArrayNativeCode(masm, &generic_array_code);
// Jump to the generic array code if the specialized code cannot handle the
// construction.
__ bind(&generic_array_code);
Handle<Code> array_code =
masm->isolate()->builtins()->InternalArrayCodeGeneric();
__ Jump(array_code, RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : number of arguments
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Label generic_array_code, one_or_more_arguments, two_or_more_arguments;
// Get the Array function.
GenerateLoadArrayFunction(masm, r1);
if (FLAG_debug_code) {
// Initial map for the builtin Array functions should be maps.
__ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
__ tst(r2, Operand(kSmiTagMask));
__ Assert(ne, "Unexpected initial map for Array function");
__ CompareObjectType(r2, r3, r4, MAP_TYPE);
__ Assert(eq, "Unexpected initial map for Array function");
}
// Run the native code for the Array function called as a normal function.
ArrayNativeCode(masm, &generic_array_code);
// Jump to the generic array code if the specialized code cannot handle
// the construction.
__ bind(&generic_array_code);
Handle<Code> array_code =
masm->isolate()->builtins()->ArrayCodeGeneric();
__ Jump(array_code, RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ArrayConstructCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : number of arguments
// -- r1 : constructor function
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Label generic_constructor;
if (FLAG_debug_code) {
// The array construct code is only set for the builtin and internal
// Array functions which always have a map.
// Initial map for the builtin Array function should be a map.
__ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
__ tst(r2, Operand(kSmiTagMask));
__ Assert(ne, "Unexpected initial map for Array function");
__ CompareObjectType(r2, r3, r4, MAP_TYPE);
__ Assert(eq, "Unexpected initial map for Array function");
}
// Run the native code for the Array function called as a constructor.
ArrayNativeCode(masm, &generic_constructor);
// Jump to the generic construct code in case the specialized code cannot
// handle the construction.
__ bind(&generic_constructor);
Handle<Code> generic_construct_stub =
masm->isolate()->builtins()->JSConstructStubGeneric();
__ Jump(generic_construct_stub, RelocInfo::CODE_TARGET);
}
void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : number of arguments
// -- r1 : constructor function
// -- lr : return address
// -- sp[(argc - n - 1) * 4] : arg[n] (zero based)
// -- sp[argc * 4] : receiver
// -----------------------------------
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->string_ctor_calls(), 1, r2, r3);
Register function = r1;
if (FLAG_debug_code) {
__ LoadGlobalFunction(Context::STRING_FUNCTION_INDEX, r2);
__ cmp(function, Operand(r2));
__ Assert(eq, "Unexpected String function");
}
// Load the first arguments in r0 and get rid of the rest.
Label no_arguments;
__ cmp(r0, Operand(0, RelocInfo::NONE));
__ b(eq, &no_arguments);
// First args = sp[(argc - 1) * 4].
__ sub(r0, r0, Operand(1));
__ ldr(r0, MemOperand(sp, r0, LSL, kPointerSizeLog2, PreIndex));
// sp now point to args[0], drop args[0] + receiver.
__ Drop(2);
Register argument = r2;
Label not_cached, argument_is_string;
NumberToStringStub::GenerateLookupNumberStringCache(
masm,
r0, // Input.
argument, // Result.
r3, // Scratch.
r4, // Scratch.
r5, // Scratch.
false, // Is it a Smi?
¬_cached);
__ IncrementCounter(counters->string_ctor_cached_number(), 1, r3, r4);
__ bind(&argument_is_string);
// ----------- S t a t e -------------
// -- r2 : argument converted to string
// -- r1 : constructor function
// -- lr : return address
// -----------------------------------
Label gc_required;
__ AllocateInNewSpace(JSValue::kSize,
r0, // Result.
r3, // Scratch.
r4, // Scratch.
&gc_required,
TAG_OBJECT);
// Initialising the String Object.
Register map = r3;
__ LoadGlobalFunctionInitialMap(function, map, r4);
if (FLAG_debug_code) {
__ ldrb(r4, FieldMemOperand(map, Map::kInstanceSizeOffset));
__ cmp(r4, Operand(JSValue::kSize >> kPointerSizeLog2));
__ Assert(eq, "Unexpected string wrapper instance size");
__ ldrb(r4, FieldMemOperand(map, Map::kUnusedPropertyFieldsOffset));
__ cmp(r4, Operand(0, RelocInfo::NONE));
__ Assert(eq, "Unexpected unused properties of string wrapper");
}
__ str(map, FieldMemOperand(r0, HeapObject::kMapOffset));
__ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex);
__ str(r3, FieldMemOperand(r0, JSObject::kPropertiesOffset));
__ str(r3, FieldMemOperand(r0, JSObject::kElementsOffset));
__ str(argument, FieldMemOperand(r0, JSValue::kValueOffset));
// Ensure the object is fully initialized.
STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
__ Ret();
// The argument was not found in the number to string cache. Check
// if it's a string already before calling the conversion builtin.
Label convert_argument;
__ bind(¬_cached);
__ JumpIfSmi(r0, &convert_argument);
// Is it a String?
__ ldr(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
__ ldrb(r3, FieldMemOperand(r2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kNotStringTag != 0);
__ tst(r3, Operand(kIsNotStringMask));
__ b(ne, &convert_argument);
__ mov(argument, r0);
__ IncrementCounter(counters->string_ctor_conversions(), 1, r3, r4);
__ b(&argument_is_string);
// Invoke the conversion builtin and put the result into r2.
__ bind(&convert_argument);
__ push(function); // Preserve the function.
__ IncrementCounter(counters->string_ctor_conversions(), 1, r3, r4);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(r0);
__ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);
}
__ pop(function);
__ mov(argument, r0);
__ b(&argument_is_string);
// Load the empty string into r2, remove the receiver from the
// stack, and jump back to the case where the argument is a string.
__ bind(&no_arguments);
__ LoadRoot(argument, Heap::kEmptyStringRootIndex);
__ Drop(1);
__ b(&argument_is_string);
// At this point the argument is already a string. Call runtime to
// create a string wrapper.
__ bind(&gc_required);
__ IncrementCounter(counters->string_ctor_gc_required(), 1, r3, r4);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(argument);
__ CallRuntime(Runtime::kNewStringWrapper, 1);
}
__ Ret();
}
static void Generate_JSConstructStubHelper(MacroAssembler* masm,
bool is_api_function,
bool count_constructions) {
// ----------- S t a t e -------------
// -- r0 : number of arguments
// -- r1 : constructor function
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
// Should never count constructions for api objects.
ASSERT(!is_api_function || !count_constructions);
Isolate* isolate = masm->isolate();
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the two incoming parameters on the stack.
__ mov(r0, Operand(r0, LSL, kSmiTagSize));
__ push(r0); // Smi-tagged arguments count.
__ push(r1); // Constructor function.
// Try to allocate the object without transitioning into C code. If any of
// the preconditions is not met, the code bails out to the runtime call.
Label rt_call, allocated;
if (FLAG_inline_new) {
Label undo_allocation;
#ifdef ENABLE_DEBUGGER_SUPPORT
ExternalReference debug_step_in_fp =
ExternalReference::debug_step_in_fp_address(isolate);
__ mov(r2, Operand(debug_step_in_fp));
__ ldr(r2, MemOperand(r2));
__ tst(r2, r2);
__ b(ne, &rt_call);
#endif
// Load the initial map and verify that it is in fact a map.
// r1: constructor function
__ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
__ JumpIfSmi(r2, &rt_call);
__ CompareObjectType(r2, r3, r4, MAP_TYPE);
__ b(ne, &rt_call);
// Check that the constructor is not constructing a JSFunction (see
// comments in Runtime_NewObject in runtime.cc). In which case the
// initial map's instance type would be JS_FUNCTION_TYPE.
// r1: constructor function
// r2: initial map
__ CompareInstanceType(r2, r3, JS_FUNCTION_TYPE);
__ b(eq, &rt_call);
if (count_constructions) {
Label allocate;
// Decrease generous allocation count.
__ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
MemOperand constructor_count =
FieldMemOperand(r3, SharedFunctionInfo::kConstructionCountOffset);
__ ldrb(r4, constructor_count);
__ sub(r4, r4, Operand(1), SetCC);
__ strb(r4, constructor_count);
__ b(ne, &allocate);
__ Push(r1, r2);
__ push(r1); // constructor
// The call will replace the stub, so the countdown is only done once.
__ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
__ pop(r2);
__ pop(r1);
__ bind(&allocate);
}
// Now allocate the JSObject on the heap.
// r1: constructor function
// r2: initial map
__ ldrb(r3, FieldMemOperand(r2, Map::kInstanceSizeOffset));
__ AllocateInNewSpace(r3, r4, r5, r6, &rt_call, SIZE_IN_WORDS);
// Allocated the JSObject, now initialize the fields. Map is set to
// initial map and properties and elements are set to empty fixed array.
// r1: constructor function
// r2: initial map
// r3: object size
// r4: JSObject (not tagged)
__ LoadRoot(r6, Heap::kEmptyFixedArrayRootIndex);
__ mov(r5, r4);
ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
__ str(r2, MemOperand(r5, kPointerSize, PostIndex));
ASSERT_EQ(1 * kPointerSize, JSObject::kPropertiesOffset);
__ str(r6, MemOperand(r5, kPointerSize, PostIndex));
ASSERT_EQ(2 * kPointerSize, JSObject::kElementsOffset);
__ str(r6, MemOperand(r5, kPointerSize, PostIndex));
// Fill all the in-object properties with the appropriate filler.
// r1: constructor function
// r2: initial map
// r3: object size (in words)
// r4: JSObject (not tagged)
// r5: First in-object property of JSObject (not tagged)
__ add(r6, r4, Operand(r3, LSL, kPointerSizeLog2)); // End of object.
ASSERT_EQ(3 * kPointerSize, JSObject::kHeaderSize);
__ LoadRoot(r7, Heap::kUndefinedValueRootIndex);
if (count_constructions) {
__ ldr(r0, FieldMemOperand(r2, Map::kInstanceSizesOffset));
__ Ubfx(r0, r0, Map::kPreAllocatedPropertyFieldsByte * kBitsPerByte,
kBitsPerByte);
__ add(r0, r5, Operand(r0, LSL, kPointerSizeLog2));
// r0: offset of first field after pre-allocated fields
if (FLAG_debug_code) {
__ cmp(r0, r6);
__ Assert(le, "Unexpected number of pre-allocated property fields.");
}
__ InitializeFieldsWithFiller(r5, r0, r7);
// To allow for truncation.
__ LoadRoot(r7, Heap::kOnePointerFillerMapRootIndex);
}
__ InitializeFieldsWithFiller(r5, r6, r7);
// Add the object tag to make the JSObject real, so that we can continue
// and jump into the continuation code at any time from now on. Any
// failures need to undo the allocation, so that the heap is in a
// consistent state and verifiable.
__ add(r4, r4, Operand(kHeapObjectTag));
// Check if a non-empty properties array is needed. Continue with
// allocated object if not fall through to runtime call if it is.
// r1: constructor function
// r4: JSObject
// r5: start of next object (not tagged)
__ ldrb(r3, FieldMemOperand(r2, Map::kUnusedPropertyFieldsOffset));
// The field instance sizes contains both pre-allocated property fields
// and in-object properties.
__ ldr(r0, FieldMemOperand(r2, Map::kInstanceSizesOffset));
__ Ubfx(r6, r0, Map::kPreAllocatedPropertyFieldsByte * kBitsPerByte,
kBitsPerByte);
__ add(r3, r3, Operand(r6));
__ Ubfx(r6, r0, Map::kInObjectPropertiesByte * kBitsPerByte,
kBitsPerByte);
__ sub(r3, r3, Operand(r6), SetCC);
// Done if no extra properties are to be allocated.
__ b(eq, &allocated);
__ Assert(pl, "Property allocation count failed.");
// Scale the number of elements by pointer size and add the header for
// FixedArrays to the start of the next object calculation from above.
// r1: constructor
// r3: number of elements in properties array
// r4: JSObject
// r5: start of next object
__ add(r0, r3, Operand(FixedArray::kHeaderSize / kPointerSize));
__ AllocateInNewSpace(
r0,
r5,
r6,
r2,
&undo_allocation,
static_cast<AllocationFlags>(RESULT_CONTAINS_TOP | SIZE_IN_WORDS));
// Initialize the FixedArray.
// r1: constructor
// r3: number of elements in properties array
// r4: JSObject
// r5: FixedArray (not tagged)
__ LoadRoot(r6, Heap::kFixedArrayMapRootIndex);
__ mov(r2, r5);
ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
__ str(r6, MemOperand(r2, kPointerSize, PostIndex));
ASSERT_EQ(1 * kPointerSize, FixedArray::kLengthOffset);
__ mov(r0, Operand(r3, LSL, kSmiTagSize));
__ str(r0, MemOperand(r2, kPointerSize, PostIndex));
// Initialize the fields to undefined.
// r1: constructor function
// r2: First element of FixedArray (not tagged)
// r3: number of elements in properties array
// r4: JSObject
// r5: FixedArray (not tagged)
__ add(r6, r2, Operand(r3, LSL, kPointerSizeLog2)); // End of object.
ASSERT_EQ(2 * kPointerSize, FixedArray::kHeaderSize);
{ Label loop, entry;
if (count_constructions) {
__ LoadRoot(r7, Heap::kUndefinedValueRootIndex);
} else if (FLAG_debug_code) {
__ LoadRoot(r8, Heap::kUndefinedValueRootIndex);
__ cmp(r7, r8);
__ Assert(eq, "Undefined value not loaded.");
}
__ b(&entry);
__ bind(&loop);
__ str(r7, MemOperand(r2, kPointerSize, PostIndex));
__ bind(&entry);
__ cmp(r2, r6);
__ b(lt, &loop);
}
// Store the initialized FixedArray into the properties field of
// the JSObject
// r1: constructor function
// r4: JSObject
// r5: FixedArray (not tagged)
__ add(r5, r5, Operand(kHeapObjectTag)); // Add the heap tag.
__ str(r5, FieldMemOperand(r4, JSObject::kPropertiesOffset));
// Continue with JSObject being successfully allocated
// r1: constructor function
// r4: JSObject
__ jmp(&allocated);
// Undo the setting of the new top so that the heap is verifiable. For
// example, the map's unused properties potentially do not match the
// allocated objects unused properties.
// r4: JSObject (previous new top)
__ bind(&undo_allocation);
__ UndoAllocationInNewSpace(r4, r5);
}
// Allocate the new receiver object using the runtime call.
// r1: constructor function
__ bind(&rt_call);
__ push(r1); // argument for Runtime_NewObject
__ CallRuntime(Runtime::kNewObject, 1);
__ mov(r4, r0);
// Receiver for constructor call allocated.
// r4: JSObject
__ bind(&allocated);
__ push(r4);
__ push(r4);
// Reload the number of arguments and the constructor from the stack.
// sp[0]: receiver
// sp[1]: receiver
// sp[2]: constructor function
// sp[3]: number of arguments (smi-tagged)
__ ldr(r1, MemOperand(sp, 2 * kPointerSize));
__ ldr(r3, MemOperand(sp, 3 * kPointerSize));
// Set up pointer to last argument.
__ add(r2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
// Set up number of arguments for function call below
__ mov(r0, Operand(r3, LSR, kSmiTagSize));
// Copy arguments and receiver to the expression stack.
// r0: number of arguments
// r1: constructor function
// r2: address of last argument (caller sp)
// r3: number of arguments (smi-tagged)
// sp[0]: receiver
// sp[1]: receiver
// sp[2]: constructor function
// sp[3]: number of arguments (smi-tagged)
Label loop, entry;
__ b(&entry);
__ bind(&loop);
__ ldr(ip, MemOperand(r2, r3, LSL, kPointerSizeLog2 - 1));
__ push(ip);
__ bind(&entry);
__ sub(r3, r3, Operand(2), SetCC);
__ b(ge, &loop);
// Call the function.
// r0: number of arguments
// r1: constructor function
if (is_api_function) {
__ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
Handle<Code> code =
masm->isolate()->builtins()->HandleApiCallConstruct();
ParameterCount expected(0);
__ InvokeCode(code, expected, expected,
RelocInfo::CODE_TARGET, CALL_FUNCTION, CALL_AS_METHOD);
} else {
ParameterCount actual(r0);
__ InvokeFunction(r1, actual, CALL_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
}
// Store offset of return address for deoptimizer.
if (!is_api_function && !count_constructions) {
masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
}
// Restore context from the frame.
// r0: result
// sp[0]: receiver
// sp[1]: constructor function
// sp[2]: number of arguments (smi-tagged)
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
// If the result is an object (in the ECMA sense), we should get rid
// of the receiver and use the result; see ECMA-262 section 13.2.2-7
// on page 74.
Label use_receiver, exit;
// If the result is a smi, it is *not* an object in the ECMA sense.
// r0: result
// sp[0]: receiver (newly allocated object)