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v8/src/arm/builtins-arm.cc
danno@chromium.org bd4e114b8e Add code again to allow reclaiming old unexecuted functions. 
When code objects in the heap for FUNCTIONs and OPTIMIZED_FUNCTIONs are marked by the GC, their prologue is patched with a call to a stub that removes the patch. This allows the collector to quickly identify code objects that haven't been executed since the last full collection (they are the ones that sill contain the patch). The functionality is currently disabled, but can be activated by specifying the "--age-code".

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/10837037

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12898 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2012-11-08 12:18:11 +00:00

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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 native context.
__ ldr(result,
MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
__ ldr(result,
FieldMemOperand(result, GlobalObject::kNativeContextOffset));
// Load the InternalArray function from the native 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 native context.
__ ldr(result,
MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
__ ldr(result,
FieldMemOperand(result, GlobalObject::kNativeContextOffset));
// Load the Array function from the native 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, false);
// 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, fill_with_hole);
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, &not_empty_array);
__ Drop(1); // Adjust stack.
__ mov(r0, Operand(0)); // Treat this as a call with argc of zero.
__ b(&empty_array);
__ bind(&not_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, &not_double, DONT_DO_SMI_CHECK);
__ bind(&cant_transition_map);
__ UndoAllocationInNewSpace(r3, r4);
__ b(call_generic_code);
__ bind(&not_double);
// Transition FAST_SMI_ELEMENTS to FAST_ELEMENTS.
// r3: JSArray
__ ldr(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
__ LoadTransitionedArrayMapConditional(FAST_SMI_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?
&not_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(&not_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 GenerateTailCallToSharedCode(MacroAssembler* masm) {
__ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r2, FieldMemOperand(r2, SharedFunctionInfo::kCodeOffset));
__ add(r2, r2, Operand(Code::kHeaderSize - kHeapObjectTag));
__ mov(pc, r2);
}
void Builtins::Generate_InRecompileQueue(MacroAssembler* masm) {
GenerateTailCallToSharedCode(masm);
}
void Builtins::Generate_ParallelRecompile(MacroAssembler* masm) {
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Push a copy of the function onto the stack.
__ push(r1);
// Push call kind information.
__ push(r5);
__ push(r1); // Function is also the parameter to the runtime call.
__ CallRuntime(Runtime::kParallelRecompile, 1);
// Restore call kind information.
__ pop(r5);
// Restore receiver.
__ pop(r1);
// Tear down internal frame.
}
GenerateTailCallToSharedCode(masm);
}
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)
// sp[1]: constructor function
// sp[2]: number of arguments (smi-tagged)
__ JumpIfSmi(r0, &use_receiver);
// If the type of the result (stored in its map) is less than
// FIRST_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense.
__ CompareObjectType(r0, r3, r3, FIRST_SPEC_OBJECT_TYPE);
__ b(ge, &exit);
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ ldr(r0, MemOperand(sp));
// Remove receiver from the stack, remove caller arguments, and
// return.
__ bind(&exit);
// r0: result
// sp[0]: receiver (newly allocated object)
// sp[1]: constructor function
// sp[2]: number of arguments (smi-tagged)
__ ldr(r1, MemOperand(sp, 2 * kPointerSize));
// Leave construct frame.
}
__ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2 - 1));
__ add(sp, sp, Operand(kPointerSize));
__ IncrementCounter(isolate->counters()->constructed_objects(), 1, r1, r2);
__ Jump(lr);
}
void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, true);
}
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, false);
}
void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, true, false);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// Called from Generate_JS_Entry
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// r4: argv
// r5-r7, cp may be clobbered
// Clear the context before we push it when entering the internal frame.
__ mov(cp, Operand(0, RelocInfo::NONE));
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Set up the context from the function argument.
__ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
__ InitializeRootRegister();
// Push the function and the receiver onto the stack.
__ push(r1);
__ push(r2);
// Copy arguments to the stack in a loop.
// r1: function
// r3: argc
// r4: argv, i.e. points to first arg
Label loop, entry;
__ add(r2, r4, Operand(r3, LSL, kPointerSizeLog2));
// r2 points past last arg.
__ b(&entry);
__ bind(&loop);
__ ldr(r0, MemOperand(r4, kPointerSize, PostIndex)); // read next parameter
__ ldr(r0, MemOperand(r0)); // dereference handle
__ push(r0); // push parameter
__ bind(&entry);
__ cmp(r4, r2);
__ b(ne, &loop);
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(r4, Heap::kUndefinedValueRootIndex);
__ mov(r5, Operand(r4));
__ mov(r6, Operand(r4));
__ mov(r7, Operand(r4));
if (kR9Available == 1) {
__ mov(r9, Operand(r4));
}
// Invoke the code and pass argc as r0.
__ mov(r0, Operand(r3));
if (is_construct) {
CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
__ CallStub(&stub);
} else {
ParameterCount actual(r0);
__ InvokeFunction(r1, actual, CALL_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
}
// Exit the JS frame and remove the parameters (except function), and
// return.
// Respect ABI stack constraint.
}
__ Jump(lr);
// r0: result
}
void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, false);
}
void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, true);
}
void Builtins::Generate_LazyCompile(MacroAssembler* masm) {
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Preserve the function.
__ push(r1);
// Push call kind information.
__ push(r5);
// Push the function on the stack as the argument to the runtime function.
__ push(r1);
__ CallRuntime(Runtime::kLazyCompile, 1);
// Calculate the entry point.
__ add(r2, r0, Operand(Code::kHeaderSize - kHeapObjectTag));
// Restore call kind information.
__ pop(r5);
// Restore saved function.
__ pop(r1);
// Tear down internal frame.
}
// Do a tail-call of the compiled function.
__ Jump(r2);
}
void Builtins::Generate_LazyRecompile(MacroAssembler* masm) {
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Preserve the function.
__ push(r1);
// Push call kind information.
__ push(r5);
// Push the function on the stack as the argument to the runtime function.
__ push(r1);
__ CallRuntime(Runtime::kLazyRecompile, 1);
// Calculate the entry point.
__ add(r2, r0, Operand(Code::kHeaderSize - kHeapObjectTag));
// Restore call kind information.
__ pop(r5);
// Restore saved function.
__ pop(r1);
// Tear down internal frame.
}
// Do a tail-call of the compiled function.
__ Jump(r2);
}
static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
// For now, we are relying on the fact that make_code_young doesn't do any
// garbage collection which allows us to save/restore the registers without
// worrying about which of them contain pointers. We also don't build an
// internal frame to make the code faster, since we shouldn't have to do stack
// crawls in MakeCodeYoung. This seems a bit fragile.
// The following registers must be saved and restored when calling through to
// the runtime:
// r0 - contains return address (beginning of patch sequence)
// r1 - function object
FrameScope scope(masm, StackFrame::MANUAL);
__ stm(db_w, sp, r0.bit() | r1.bit() | fp.bit() | lr.bit());
__ PrepareCallCFunction(1, 0, r1);
__ CallCFunction(
ExternalReference::get_make_code_young_function(masm->isolate()), 1);
__ ldm(ia_w, sp, r0.bit() | r1.bit() | fp.bit() | lr.bit());
__ mov(pc, r0);
}
#define DEFINE_CODE_AGE_BUILTIN_GENERATOR(C) \
void Builtins::Generate_Make##C##CodeYoungAgainEvenMarking( \
MacroAssembler* masm) { \
GenerateMakeCodeYoungAgainCommon(masm); \
} \
void Builtins::Generate_Make##C##CodeYoungAgainOddMarking( \
MacroAssembler* masm) { \
GenerateMakeCodeYoungAgainCommon(masm); \
}
CODE_AGE_LIST(DEFINE_CODE_AGE_BUILTIN_GENERATOR)
#undef DEFINE_CODE_AGE_BUILTIN_GENERATOR
static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
Deoptimizer::BailoutType type) {
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Pass the function and deoptimization type to the runtime system.
__ mov(r0, Operand(Smi::FromInt(static_cast<int>(type))));
__ push(r0);
__ CallRuntime(Runtime::kNotifyDeoptimized, 1);
}
// Get the full codegen state from the stack and untag it -> r6.
__ ldr(r6, MemOperand(sp, 0 * kPointerSize));
__ SmiUntag(r6);
// Switch on the state.
Label with_tos_register, unknown_state;
__ cmp(r6, Operand(FullCodeGenerator::NO_REGISTERS));
__ b(ne, &with_tos_register);
__ add(sp, sp, Operand(1 * kPointerSize)); // Remove state.
__ Ret();
__ bind(&with_tos_register);
__ ldr(r0, MemOperand(sp, 1 * kPointerSize));
__ cmp(r6, Operand(FullCodeGenerator::TOS_REG));
__ b(ne, &unknown_state);
__ add(sp, sp, Operand(2 * kPointerSize)); // Remove state.
__ Ret();
__ bind(&unknown_state);
__ stop("no cases left");
}
void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
}
void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
}
void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
// For now, we are relying on the fact that Runtime::NotifyOSR
// doesn't do any garbage collection which allows us to save/restore
// the registers without worrying about which of them contain
// pointers. This seems a bit fragile.
__ stm(db_w, sp, kJSCallerSaved | kCalleeSaved | lr.bit() | fp.bit());
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kNotifyOSR, 0);
}
__ ldm(ia_w, sp, kJSCallerSaved | kCalleeSaved | lr.bit() | fp.bit());
__ Ret();
}
void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
CpuFeatures::TryForceFeatureScope scope(VFP3);
if (!CPU::SupportsCrankshaft()) {
__ Abort("Unreachable code: Cannot optimize without VFP3 support.");
return;
}
// Lookup the function in the JavaScript frame and push it as an
// argument to the on-stack replacement function.
__ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(r0);
__ CallRuntime(Runtime::kCompileForOnStackReplacement, 1);
}
// If the result was -1 it means that we couldn't optimize the
// function. Just return and continue in the unoptimized version.
Label skip;
__ cmp(r0, Operand(Smi::FromInt(-1)));
__ b(ne, &skip);
__ Ret();
__ bind(&skip);
// Untag the AST id and push it on the stack.
__ SmiUntag(r0);
__ push(r0);
// Generate the code for doing the frame-to-frame translation using
// the deoptimizer infrastructure.
Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
generator.Generate();
}
void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
// 1. Make sure we have at least one argument.
// r0: actual number of arguments
{ Label done;
__ cmp(r0, Operand(0));
__ b(ne, &done);
__ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
__ push(r2);
__ add(r0, r0, Operand(1));
__ bind(&done);
}
// 2. Get the function to call (passed as receiver) from the stack, check
// if it is a function.
// r0: actual number of arguments
Label slow, non_function;
__ ldr(r1, MemOperand(sp, r0, LSL, kPointerSizeLog2));
__ JumpIfSmi(r1, &non_function);
__ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
__ b(ne, &slow);
// 3a. Patch the first argument if necessary when calling a function.
// r0: actual number of arguments
// r1: function
Label shift_arguments;
__ mov(r4, Operand(0, RelocInfo::NONE)); // indicate regular JS_FUNCTION
{ Label convert_to_object, use_global_receiver, patch_receiver;
// Change context eagerly in case we need the global receiver.
__ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
// Do not transform the receiver for strict mode functions.
__ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r3, FieldMemOperand(r2, SharedFunctionInfo::kCompilerHintsOffset));
__ tst(r3, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
kSmiTagSize)));
__ b(ne, &shift_arguments);
// Do not transform the receiver for native (Compilerhints already in r3).
__ tst(r3, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
__ b(ne, &shift_arguments);
// Compute the receiver in non-strict mode.
__ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2));
__ ldr(r2, MemOperand(r2, -kPointerSize));
// r0: actual number of arguments
// r1: function
// r2: first argument
__ JumpIfSmi(r2, &convert_to_object);
__ LoadRoot(r3, Heap::kUndefinedValueRootIndex);
__ cmp(r2, r3);
__ b(eq, &use_global_receiver);
__ LoadRoot(r3, Heap::kNullValueRootIndex);
__ cmp(r2, r3);
__ b(eq, &use_global_receiver);
STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
__ CompareObjectType(r2, r3, r3, FIRST_SPEC_OBJECT_TYPE);
__ b(ge, &shift_arguments);
__ bind(&convert_to_object);
{
// Enter an internal frame in order to preserve argument count.
FrameScope scope(masm, StackFrame::INTERNAL);
__ mov(r0, Operand(r0, LSL, kSmiTagSize)); // Smi-tagged.
__ push(r0);
__ push(r2);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
__ mov(r2, r0);
__ pop(r0);
__ mov(r0, Operand(r0, ASR, kSmiTagSize));
// Exit the internal frame.
}
// Restore the function to r1, and the flag to r4.
__ ldr(r1, MemOperand(sp, r0, LSL, kPointerSizeLog2));
__ mov(r4, Operand(0, RelocInfo::NONE));
__ jmp(&patch_receiver);
// Use the global receiver object from the called function as the
// receiver.
__ bind(&use_global_receiver);
const int kGlobalIndex =
Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
__ ldr(r2, FieldMemOperand(cp, kGlobalIndex));
__ ldr(r2, FieldMemOperand(r2, GlobalObject::kNativeContextOffset));
__ ldr(r2, FieldMemOperand(r2, kGlobalIndex));
__ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalReceiverOffset));
__ bind(&patch_receiver);
__ add(r3, sp, Operand(r0, LSL, kPointerSizeLog2));
__ str(r2, MemOperand(r3, -kPointerSize));
__ jmp(&shift_arguments);
}
// 3b. Check for function proxy.
__ bind(&slow);
__ mov(r4, Operand(1, RelocInfo::NONE)); // indicate function proxy
__ cmp(r2, Operand(JS_FUNCTION_PROXY_TYPE));
__ b(eq, &shift_arguments);
__ bind(&non_function);
__ mov(r4, Operand(2, RelocInfo::NONE)); // indicate non-function
// 3c. Patch the first argument when calling a non-function. The
// CALL_NON_FUNCTION builtin expects the non-function callee as
// receiver, so overwrite the first argument which will ultimately
// become the receiver.
// r0: actual number of arguments
// r1: function
// r4: call type (0: JS function, 1: function proxy, 2: non-function)
__ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2));
__ str(r1, MemOperand(r2, -kPointerSize));
// 4. Shift arguments and return address one slot down on the stack
// (overwriting the original receiver). Adjust argument count to make
// the original first argument the new receiver.
// r0: actual number of arguments
// r1: function
// r4: call type (0: JS function, 1: function proxy, 2: non-function)
__ bind(&shift_arguments);
{ Label loop;
// Calculate the copy start address (destination). Copy end address is sp.
__ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2));
__ bind(&loop);
__ ldr(ip, MemOperand(r2, -kPointerSize));
__ str(ip, MemOperand(r2));
__ sub(r2, r2, Operand(kPointerSize));
__ cmp(r2, sp);
__ b(ne, &loop);
// Adjust the actual number of arguments and remove the top element
// (which is a copy of the last argument).
__ sub(r0, r0, Operand(1));
__ pop();
}
// 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin,
// or a function proxy via CALL_FUNCTION_PROXY.
// r0: actual number of arguments
// r1: function
// r4: call type (0: JS function, 1: function proxy, 2: non-function)
{ Label function, non_proxy;
__ tst(r4, r4);
__ b(eq, &function);
// Expected number of arguments is 0 for CALL_NON_FUNCTION.
__ mov(r2, Operand(0, RelocInfo::NONE));
__ SetCallKind(r5, CALL_AS_METHOD);
__ cmp(r4, Operand(1));
__ b(ne, &non_proxy);
__ push(r1); // re-add proxy object as additional argument
__ add(r0, r0, Operand(1));
__ GetBuiltinEntry(r3, Builtins::CALL_FUNCTION_PROXY);
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
__ bind(&non_proxy);
__ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION);
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
__ bind(&function);
}
// 5b. Get the code to call from the function and check that the number of
// expected arguments matches what we're providing. If so, jump
// (tail-call) to the code in register edx without checking arguments.
// r0: actual number of arguments
// r1: function
__ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
__ ldr(r2,
FieldMemOperand(r3, SharedFunctionInfo::kFormalParameterCountOffset));
__ mov(r2, Operand(r2, ASR, kSmiTagSize));
__ ldr(r3, FieldMemOperand(r1, JSFunction::kCodeEntryOffset));
__ SetCallKind(r5, CALL_AS_METHOD);
__ cmp(r2, r0); // Check formal and actual parameter counts.
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET,
ne);
ParameterCount expected(0);
__ InvokeCode(r3, expected, expected, JUMP_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
}
void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
const int kIndexOffset = -5 * kPointerSize;
const int kLimitOffset = -4 * kPointerSize;
const int kArgsOffset = 2 * kPointerSize;
const int kRecvOffset = 3 * kPointerSize;
const int kFunctionOffset = 4 * kPointerSize;
{
FrameScope frame_scope(masm, StackFrame::INTERNAL);
__ ldr(r0, MemOperand(fp, kFunctionOffset)); // get the function
__ push(r0);
__ ldr(r0, MemOperand(fp, kArgsOffset)); // get the args array
__ push(r0);
__ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
Label okay;
__ LoadRoot(r2, Heap::kRealStackLimitRootIndex);
// Make r2 the space we have left. The stack might already be overflowed
// here which will cause r2 to become negative.
__ sub(r2, sp, r2);
// Check if the arguments will overflow the stack.
__ cmp(r2, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize));
__ b(gt, &okay); // Signed comparison.
// Out of stack space.
__ ldr(r1, MemOperand(fp, kFunctionOffset));
__ push(r1);
__ push(r0);
__ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);
// End of stack check.
// Push current limit and index.
__ bind(&okay);
__ push(r0); // limit
__ mov(r1, Operand(0, RelocInfo::NONE)); // initial index
__ push(r1);
// Get the receiver.
__ ldr(r0, MemOperand(fp, kRecvOffset));
// Check that the function is a JS function (otherwise it must be a proxy).
Label push_receiver;
__ ldr(r1, MemOperand(fp, kFunctionOffset));
__ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
__ b(ne, &push_receiver);
// Change context eagerly to get the right global object if necessary.
__ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
// Load the shared function info while the function is still in r1.
__ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
// Compute the receiver.
// Do not transform the receiver for strict mode functions.
Label call_to_object, use_global_receiver;
__ ldr(r2, FieldMemOperand(r2, SharedFunctionInfo::kCompilerHintsOffset));
__ tst(r2, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
kSmiTagSize)));
__ b(ne, &push_receiver);
// Do not transform the receiver for strict mode functions.
__ tst(r2, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
__ b(ne, &push_receiver);
// Compute the receiver in non-strict mode.
__ JumpIfSmi(r0, &call_to_object);
__ LoadRoot(r1, Heap::kNullValueRootIndex);
__ cmp(r0, r1);
__ b(eq, &use_global_receiver);
__ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
__ cmp(r0, r1);
__ b(eq, &use_global_receiver);
// Check if the receiver is already a JavaScript object.
// r0: receiver
STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
__ CompareObjectType(r0, r1, r1, FIRST_SPEC_OBJECT_TYPE);
__ b(ge, &push_receiver);
// Convert the receiver to a regular object.
// r0: receiver
__ bind(&call_to_object);
__ push(r0);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
__ b(&push_receiver);
// Use the current global receiver object as the receiver.
__ bind(&use_global_receiver);
const int kGlobalOffset =
Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
__ ldr(r0, FieldMemOperand(cp, kGlobalOffset));
__ ldr(r0, FieldMemOperand(r0, GlobalObject::kNativeContextOffset));
__ ldr(r0, FieldMemOperand(r0, kGlobalOffset));
__ ldr(r0, FieldMemOperand(r0, GlobalObject::kGlobalReceiverOffset));
// Push the receiver.
// r0: receiver
__ bind(&push_receiver);
__ push(r0);
// Copy all arguments from the array to the stack.
Label entry, loop;
__ ldr(r0, MemOperand(fp, kIndexOffset));
__ b(&entry);
// Load the current argument from the arguments array and push it to the
// stack.
// r0: current argument index
__ bind(&loop);
__ ldr(r1, MemOperand(fp, kArgsOffset));
__ push(r1);
__ push(r0);
// Call the runtime to access the property in the arguments array.
__ CallRuntime(Runtime::kGetProperty, 2);
__ push(r0);
// Use inline caching to access the arguments.
__ ldr(r0, MemOperand(fp, kIndexOffset));
__ add(r0, r0, Operand(1 << kSmiTagSize));
__ str(r0, MemOperand(fp, kIndexOffset));
// Test if the copy loop has finished copying all the elements from the
// arguments object.
__ bind(&entry);
__ ldr(r1, MemOperand(fp, kLimitOffset));
__ cmp(r0, r1);
__ b(ne, &loop);
// Invoke the function.
Label call_proxy;
ParameterCount actual(r0);
__ mov(r0, Operand(r0, ASR, kSmiTagSize));
__ ldr(r1, MemOperand(fp, kFunctionOffset));
__ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
__ b(ne, &call_proxy);
__ InvokeFunction(r1, actual, CALL_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
frame_scope.GenerateLeaveFrame();
__ add(sp, sp, Operand(3 * kPointerSize));
__ Jump(lr);
// Invoke the function proxy.
__ bind(&call_proxy);
__ push(r1); // add function proxy as last argument
__ add(r0, r0, Operand(1));
__ mov(r2, Operand(0, RelocInfo::NONE));
__ SetCallKind(r5, CALL_AS_METHOD);
__ GetBuiltinEntry(r3, Builtins::CALL_FUNCTION_PROXY);
__ Call(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
// Tear down the internal frame and remove function, receiver and args.
}
__ add(sp, sp, Operand(3 * kPointerSize));
__ Jump(lr);
}
static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
__ mov(r0, Operand(r0, LSL, kSmiTagSize));
__ mov(r4, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ stm(db_w, sp, r0.bit() | r1.bit() | r4.bit() | fp.bit() | lr.bit());
__ add(fp, sp, Operand(3 * kPointerSize));
}
static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : result being passed through
// -----------------------------------
// Get the number of arguments passed (as a smi), tear down the frame and
// then tear down the parameters.
__ ldr(r1, MemOperand(fp, -3 * kPointerSize));
__ mov(sp, fp);
__ ldm(ia_w, sp, fp.bit() | lr.bit());
__ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2 - kSmiTagSize));
__ add(sp, sp, Operand(kPointerSize)); // adjust for receiver
}
void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r0 : actual number of arguments
// -- r1 : function (passed through to callee)
// -- r2 : expected number of arguments
// -- r3 : code entry to call
// -- r5 : call kind information
// -----------------------------------
Label invoke, dont_adapt_arguments;
Label enough, too_few;
__ cmp(r0, r2);
__ b(lt, &too_few);
__ cmp(r2, Operand(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
__ b(eq, &dont_adapt_arguments);
{ // Enough parameters: actual >= expected
__ bind(&enough);
EnterArgumentsAdaptorFrame(masm);
// Calculate copy start address into r0 and copy end address into r2.
// r0: actual number of arguments as a smi
// r1: function
// r2: expected number of arguments
// r3: code entry to call
__ add(r0, fp, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize));
// adjust for return address and receiver
__ add(r0, r0, Operand(2 * kPointerSize));
__ sub(r2, r0, Operand(r2, LSL, kPointerSizeLog2));
// Copy the arguments (including the receiver) to the new stack frame.
// r0: copy start address
// r1: function
// r2: copy end address
// r3: code entry to call
Label copy;
__ bind(&copy);
__ ldr(ip, MemOperand(r0, 0));
__ push(ip);
__ cmp(r0, r2); // Compare before moving to next argument.
__ sub(r0, r0, Operand(kPointerSize));
__ b(ne, &copy);
__ b(&invoke);
}
{ // Too few parameters: Actual < expected
__ bind(&too_few);
EnterArgumentsAdaptorFrame(masm);
// Calculate copy start address into r0 and copy end address is fp.
// r0: actual number of arguments as a smi
// r1: function
// r2: expected number of arguments
// r3: code entry to call
__ add(r0, fp, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize));
// Copy the arguments (including the receiver) to the new stack frame.
// r0: copy start address
// r1: function
// r2: expected number of arguments
// r3: code entry to call
Label copy;
__ bind(&copy);
// Adjust load for return address and receiver.
__ ldr(ip, MemOperand(r0, 2 * kPointerSize));
__ push(ip);
__ cmp(r0, fp); // Compare before moving to next argument.
__ sub(r0, r0, Operand(kPointerSize));
__ b(ne, &copy);
// Fill the remaining expected arguments with undefined.
// r1: function
// r2: expected number of arguments
// r3: code entry to call
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ sub(r2, fp, Operand(r2, LSL, kPointerSizeLog2));
__ sub(r2, r2, Operand(4 * kPointerSize)); // Adjust for frame.
Label fill;
__ bind(&fill);
__ push(ip);
__ cmp(sp, r2);
__ b(ne, &fill);
}
// Call the entry point.
__ bind(&invoke);
__ Call(r3);
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(masm->pc_offset());
// Exit frame and return.
LeaveArgumentsAdaptorFrame(masm);
__ Jump(lr);
// -------------------------------------------
// Dont adapt arguments.
// -------------------------------------------
__ bind(&dont_adapt_arguments);
__ Jump(r3);
}
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_ARM
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