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sdk/runtime/vm/stub_code_ia32.cc
T
Regis Crelier 7f57ebcfa1 Remove signature classes from the VM. 
They were used as the class of closure instances and as the type class of
function types.
All closure instances now have class _Closure and function types are represented
by a new class FunctionType extending AbstractType.
Fix issue 24567 and add regression test.

R=asiva@google.com, rmacnak@google.com

Review URL: https://codereview.chromium.org/1584223006 .
2016-01-19 16:32:59 -08:00

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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h"
#if defined(TARGET_ARCH_IA32)
#include "vm/assembler.h"
#include "vm/compiler.h"
#include "vm/dart_entry.h"
#include "vm/flow_graph_compiler.h"
#include "vm/instructions.h"
#include "vm/heap.h"
#include "vm/object_store.h"
#include "vm/resolver.h"
#include "vm/scavenger.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
#include "vm/tags.h"
#define __ assembler->
namespace dart {
DEFINE_FLAG(bool, inline_alloc, true, "Inline allocation of objects.");
DEFINE_FLAG(bool, use_slow_path, false,
"Set to true for debugging & verifying the slow paths.");
DECLARE_FLAG(bool, trace_optimized_ic_calls);
DECLARE_FLAG(int, optimization_counter_threshold);
DECLARE_FLAG(bool, support_debugger);
DECLARE_FLAG(bool, lazy_dispatchers);
#define INT32_SIZEOF(x) static_cast<int32_t>(sizeof(x))
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of last argument in argument array.
// ESP + 4*EDX : address of first argument in argument array.
// ESP + 4*EDX + 4 : address of return value.
// ECX : address of the runtime function to call.
// EDX : number of arguments to the call.
// Must preserve callee saved registers EDI and EBX.
void StubCode::GenerateCallToRuntimeStub(Assembler* assembler) {
const intptr_t thread_offset = NativeArguments::thread_offset();
const intptr_t argc_tag_offset = NativeArguments::argc_tag_offset();
const intptr_t argv_offset = NativeArguments::argv_offset();
const intptr_t retval_offset = NativeArguments::retval_offset();
__ EnterFrame(0);
// Save exit frame information to enable stack walking as we are about
// to transition to Dart VM C++ code.
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), EBP);
#if defined(DEBUG)
{ Label ok;
// Check that we are always entering from Dart code.
__ cmpl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing VM code.
__ movl(Assembler::VMTagAddress(), ECX);
// Reserve space for arguments and align frame before entering C++ world.
__ AddImmediate(ESP, Immediate(-INT32_SIZEOF(NativeArguments)));
if (OS::ActivationFrameAlignment() > 1) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass NativeArguments structure by value and call runtime.
__ movl(Address(ESP, thread_offset), THR); // Set thread in NativeArgs.
// There are no runtime calls to closures, so we do not need to set the tag
// bits kClosureFunctionBit and kInstanceFunctionBit in argc_tag_.
__ movl(Address(ESP, argc_tag_offset), EDX); // Set argc in NativeArguments.
// Compute argv.
__ leal(EAX, Address(EBP, EDX, TIMES_4, kParamEndSlotFromFp * kWordSize));
__ movl(Address(ESP, argv_offset), EAX); // Set argv in NativeArguments.
__ addl(EAX, Immediate(1 * kWordSize)); // Retval is next to 1st argument.
__ movl(Address(ESP, retval_offset), EAX); // Set retval in NativeArguments.
__ call(ECX);
__ movl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
// Reset exit frame information in Isolate structure.
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), Immediate(0));
__ LeaveFrame();
__ ret();
}
// Print the stop message.
DEFINE_LEAF_RUNTIME_ENTRY(void, PrintStopMessage, 1, const char* message) {
OS::Print("Stop message: %s\n", message);
}
END_LEAF_RUNTIME_ENTRY
// Input parameters:
// ESP : points to return address.
// EAX : stop message (const char*).
// Must preserve all registers, except EAX.
void StubCode::GeneratePrintStopMessageStub(Assembler* assembler) {
__ EnterCallRuntimeFrame(1 * kWordSize);
__ movl(Address(ESP, 0), EAX);
__ CallRuntime(kPrintStopMessageRuntimeEntry, 1);
__ LeaveCallRuntimeFrame();
__ ret();
}
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of return value.
// EAX : address of first argument in argument array.
// ECX : address of the native function to call.
// EDX : argc_tag including number of arguments and function kind.
void StubCode::GenerateCallNativeCFunctionStub(Assembler* assembler) {
const intptr_t native_args_struct_offset =
NativeEntry::kNumCallWrapperArguments * kWordSize;
const intptr_t thread_offset =
NativeArguments::thread_offset() + native_args_struct_offset;
const intptr_t argc_tag_offset =
NativeArguments::argc_tag_offset() + native_args_struct_offset;
const intptr_t argv_offset =
NativeArguments::argv_offset() + native_args_struct_offset;
const intptr_t retval_offset =
NativeArguments::retval_offset() + native_args_struct_offset;
__ EnterFrame(0);
// Save exit frame information to enable stack walking as we are about
// to transition to dart VM code.
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), EBP);
#if defined(DEBUG)
{ Label ok;
// Check that we are always entering from Dart code.
__ cmpl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing native code.
__ movl(Assembler::VMTagAddress(), ECX);
// Reserve space for the native arguments structure, the outgoing parameters
// (pointer to the native arguments structure, the C function entry point)
// and align frame before entering the C++ world.
__ AddImmediate(ESP,
Immediate(-INT32_SIZEOF(NativeArguments) - (2 * kWordSize)));
if (OS::ActivationFrameAlignment() > 1) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass NativeArguments structure by value and call native function.
__ movl(Address(ESP, thread_offset), THR); // Set thread in NativeArgs.
__ movl(Address(ESP, argc_tag_offset), EDX); // Set argc in NativeArguments.
__ movl(Address(ESP, argv_offset), EAX); // Set argv in NativeArguments.
__ leal(EAX, Address(EBP, 2 * kWordSize)); // Compute return value addr.
__ movl(Address(ESP, retval_offset), EAX); // Set retval in NativeArguments.
__ leal(EAX, Address(ESP, 2 * kWordSize)); // Pointer to the NativeArguments.
__ movl(Address(ESP, 0), EAX); // Pass the pointer to the NativeArguments.
__ movl(Address(ESP, kWordSize), ECX); // Function to call.
ExternalLabel label(NativeEntry::NativeCallWrapperEntry());
__ call(&label);
__ movl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
// Reset exit frame information in Isolate structure.
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), Immediate(0));
__ LeaveFrame();
__ ret();
}
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of return value.
// EAX : address of first argument in argument array.
// ECX : address of the native function to call.
// EDX : argc_tag including number of arguments and function kind.
void StubCode::GenerateCallBootstrapCFunctionStub(Assembler* assembler) {
const intptr_t native_args_struct_offset = kWordSize;
const intptr_t thread_offset =
NativeArguments::thread_offset() + native_args_struct_offset;
const intptr_t argc_tag_offset =
NativeArguments::argc_tag_offset() + native_args_struct_offset;
const intptr_t argv_offset =
NativeArguments::argv_offset() + native_args_struct_offset;
const intptr_t retval_offset =
NativeArguments::retval_offset() + native_args_struct_offset;
__ EnterFrame(0);
// Save exit frame information to enable stack walking as we are about
// to transition to dart VM code.
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), EBP);
#if defined(DEBUG)
{ Label ok;
// Check that we are always entering from Dart code.
__ cmpl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing native code.
__ movl(Assembler::VMTagAddress(), ECX);
// Reserve space for the native arguments structure, the outgoing parameter
// (pointer to the native arguments structure) and align frame before
// entering the C++ world.
__ AddImmediate(ESP, Immediate(-INT32_SIZEOF(NativeArguments) - kWordSize));
if (OS::ActivationFrameAlignment() > 1) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass NativeArguments structure by value and call native function.
__ movl(Address(ESP, thread_offset), THR); // Set thread in NativeArgs.
__ movl(Address(ESP, argc_tag_offset), EDX); // Set argc in NativeArguments.
__ movl(Address(ESP, argv_offset), EAX); // Set argv in NativeArguments.
__ leal(EAX, Address(EBP, 2 * kWordSize)); // Compute return value addr.
__ movl(Address(ESP, retval_offset), EAX); // Set retval in NativeArguments.
__ leal(EAX, Address(ESP, kWordSize)); // Pointer to the NativeArguments.
__ movl(Address(ESP, 0), EAX); // Pass the pointer to the NativeArguments.
__ call(ECX);
__ movl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
// Reset exit frame information in Isolate structure.
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), Immediate(0));
__ LeaveFrame();
__ ret();
}
// Input parameters:
// EDX: arguments descriptor array.
void StubCode::GenerateCallStaticFunctionStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(raw_null); // Setup space on stack for return value.
__ CallRuntime(kPatchStaticCallRuntimeEntry, 0);
__ popl(EAX); // Get Code object result.
__ popl(EDX); // Restore arguments descriptor array.
// Remove the stub frame as we are about to jump to the dart function.
__ LeaveFrame();
__ movl(ECX, FieldAddress(EAX, Code::entry_point_offset()));
__ jmp(ECX);
}
// Called from a static call only when an invalid code has been entered
// (invalid because its function was optimized or deoptimized).
// EDX: arguments descriptor array.
void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(raw_null); // Setup space on stack for return value.
__ CallRuntime(kFixCallersTargetRuntimeEntry, 0);
__ popl(EAX); // Get Code object.
__ popl(EDX); // Restore arguments descriptor array.
__ movl(EAX, FieldAddress(EAX, Code::entry_point_offset()));
__ LeaveFrame();
__ jmp(EAX);
__ int3();
}
// Called from object allocate instruction when the allocation stub has been
// disabled.
void StubCode::GenerateFixAllocationStubTargetStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ CallRuntime(kFixAllocationStubTargetRuntimeEntry, 0);
__ popl(EAX); // Get Code object.
__ movl(EAX, FieldAddress(EAX, Code::entry_point_offset()));
__ LeaveFrame();
__ jmp(EAX);
__ int3();
}
// Input parameters:
// EDX: smi-tagged argument count, may be zero.
// EBP[kParamEndSlotFromFp + 1]: last argument.
// Uses EAX, EBX, ECX, EDX, EDI.
static void PushArgumentsArray(Assembler* assembler) {
// Allocate array to store arguments of caller.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(ECX, raw_null); // Null element type for raw Array.
__ Call(*StubCode::AllocateArray_entry());
__ SmiUntag(EDX);
// EAX: newly allocated array.
// EDX: length of the array (was preserved by the stub).
__ pushl(EAX); // Array is in EAX and on top of stack.
__ leal(EBX, Address(EBP, EDX, TIMES_4, kParamEndSlotFromFp * kWordSize));
__ leal(ECX, FieldAddress(EAX, Array::data_offset()));
// EBX: address of first argument on stack.
// ECX: address of first argument in array.
Label loop, loop_condition;
__ jmp(&loop_condition, Assembler::kNearJump);
__ Bind(&loop);
__ movl(EDI, Address(EBX, 0));
// No generational barrier needed, since array is in new space.
__ InitializeFieldNoBarrier(EAX, Address(ECX, 0), EDI);
__ AddImmediate(ECX, Immediate(kWordSize));
__ AddImmediate(EBX, Immediate(-kWordSize));
__ Bind(&loop_condition);
__ decl(EDX);
__ j(POSITIVE, &loop, Assembler::kNearJump);
}
// Used by eager and lazy deoptimization. Preserve result in EAX if necessary.
// This stub translates optimized frame into unoptimized frame. The optimized
// frame can contain values in registers and on stack, the unoptimized
// frame contains all values on stack.
// Deoptimization occurs in following steps:
// - Push all registers that can contain values.
// - Call C routine to copy the stack and saved registers into temporary buffer.
// - Adjust caller's frame to correct unoptimized frame size.
// - Fill the unoptimized frame.
// - Materialize objects that require allocation (e.g. Double instances).
// GC can occur only after frame is fully rewritten.
// Stack after EnterDartFrame(0) below:
// +------------------+
// | PC marker | <- TOS
// +------------------+
// | Saved FP | <- FP of stub
// +------------------+
// | return-address | (deoptimization point)
// +------------------+
// | Saved CODE_REG |
// +------------------+
// | ... | <- SP of optimized frame
//
// Parts of the code cannot GC, part of the code can GC.
static void GenerateDeoptimizationSequence(Assembler* assembler,
DeoptStubKind kind) {
// Leaf runtime function DeoptimizeCopyFrame expects a Dart frame.
__ EnterDartFrame(0);
// The code in this frame may not cause GC. kDeoptimizeCopyFrameRuntimeEntry
// and kDeoptimizeFillFrameRuntimeEntry are leaf runtime calls.
const intptr_t saved_result_slot_from_fp =
kFirstLocalSlotFromFp + 1 - (kNumberOfCpuRegisters - EAX);
// Result in EAX is preserved as part of pushing all registers below.
// Push registers in their enumeration order: lowest register number at
// lowest address.
for (intptr_t i = kNumberOfCpuRegisters - 1; i >= 0; i--) {
if (i == CODE_REG) {
// Save the original value of CODE_REG pushed before invoking this stub
// instead of the value used to call this stub.
__ pushl(Address(EBP, 2 * kWordSize));
} else {
__ pushl(static_cast<Register>(i));
}
}
__ subl(ESP, Immediate(kNumberOfXmmRegisters * kFpuRegisterSize));
intptr_t offset = 0;
for (intptr_t reg_idx = 0; reg_idx < kNumberOfXmmRegisters; ++reg_idx) {
XmmRegister xmm_reg = static_cast<XmmRegister>(reg_idx);
__ movups(Address(ESP, offset), xmm_reg);
offset += kFpuRegisterSize;
}
__ movl(ECX, ESP); // Preserve saved registers block.
__ ReserveAlignedFrameSpace(2 * kWordSize);
__ movl(Address(ESP, 0 * kWordSize), ECX); // Start of register block.
__ movl(Address(ESP, 1 * kWordSize), Immediate(kind == kLazyDeopt ? 1 : 0));
__ CallRuntime(kDeoptimizeCopyFrameRuntimeEntry, 2);
// Result (EAX) is stack-size (FP - SP) in bytes.
const bool preserve_result = (kind == kLazyDeopt);
if (preserve_result) {
// Restore result into EBX temporarily.
__ movl(EBX, Address(EBP, saved_result_slot_from_fp * kWordSize));
}
__ LeaveFrame();
__ popl(EDX); // Preserve return address.
__ movl(ESP, EBP); // Discard optimized frame.
__ subl(ESP, EAX); // Reserve space for deoptimized frame.
__ pushl(EDX); // Restore return address.
// Leaf runtime function DeoptimizeFillFrame expects a Dart frame.
__ EnterDartFrame(0);
if (preserve_result) {
__ pushl(EBX); // Preserve result as first local.
}
__ ReserveAlignedFrameSpace(1 * kWordSize);
__ movl(Address(ESP, 0), EBP); // Pass last FP as parameter on stack.
__ CallRuntime(kDeoptimizeFillFrameRuntimeEntry, 1);
if (preserve_result) {
// Restore result into EBX.
__ movl(EBX, Address(EBP, kFirstLocalSlotFromFp * kWordSize));
}
// Code above cannot cause GC.
__ LeaveFrame();
// Frame is fully rewritten at this point and it is safe to perform a GC.
// Materialize any objects that were deferred by FillFrame because they
// require allocation.
__ EnterStubFrame();
if (preserve_result) {
__ pushl(EBX); // Preserve result, it will be GC-d here.
}
__ pushl(Immediate(Smi::RawValue(0))); // Space for the result.
__ CallRuntime(kDeoptimizeMaterializeRuntimeEntry, 0);
// Result tells stub how many bytes to remove from the expression stack
// of the bottom-most frame. They were used as materialization arguments.
__ popl(EBX);
__ SmiUntag(EBX);
if (preserve_result) {
__ popl(EAX); // Restore result.
}
__ LeaveFrame();
__ popl(ECX); // Pop return address.
__ addl(ESP, EBX); // Remove materialization arguments.
__ pushl(ECX); // Push return address.
__ ret();
}
// TOS: return address + call-instruction-size (5 bytes).
// EAX: result, must be preserved
void StubCode::GenerateDeoptimizeLazyStub(Assembler* assembler) {
// Correct return address to point just after the call that is being
// deoptimized.
__ popl(EBX);
__ subl(EBX, Immediate(CallPattern::pattern_length_in_bytes()));
__ pushl(EBX);
GenerateDeoptimizationSequence(assembler, kLazyDeopt);
}
void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
GenerateDeoptimizationSequence(assembler, kEagerDeopt);
}
static void GenerateDispatcherCode(Assembler* assembler,
Label* call_target_function) {
__ Comment("NoSuchMethodDispatch");
// When lazily generated invocation dispatchers are disabled, the
// miss-handler may return null.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ cmpl(EAX, raw_null);
__ j(NOT_EQUAL, call_target_function);
__ EnterStubFrame();
// Load the receiver.
__ movl(EDI, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EAX, Address(
EBP, EDI, TIMES_HALF_WORD_SIZE, kParamEndSlotFromFp * kWordSize));
__ pushl(raw_null); // Setup space on stack for result.
__ pushl(EAX); // Receiver.
__ pushl(ECX); // ICData/MegamorphicCache.
__ pushl(EDX); // Arguments descriptor array.
__ movl(EDX, EDI);
// EDX: Smi-tagged arguments array length.
PushArgumentsArray(assembler);
const intptr_t kNumArgs = 4;
__ CallRuntime(kInvokeNoSuchMethodDispatcherRuntimeEntry, kNumArgs);
__ Drop(4);
__ popl(EAX); // Return value.
__ LeaveFrame();
__ ret();
}
void StubCode::GenerateMegamorphicMissStub(Assembler* assembler) {
__ EnterStubFrame();
// Load the receiver into EAX. The argument count in the arguments
// descriptor in EDX is a smi.
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
// Two words (saved fp, stub's pc marker) in the stack above the return
// address.
__ movl(EAX, Address(ESP, EAX, TIMES_2, 2 * kWordSize));
// Preserve IC data and arguments descriptor.
__ pushl(ECX);
__ pushl(EDX);
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Instructions::null()));
__ pushl(raw_null); // Space for the result of the runtime call.
__ pushl(EAX); // Pass receiver.
__ pushl(ECX); // Pass IC data.
__ pushl(EDX); // Pass arguments descriptor.
__ CallRuntime(kMegamorphicCacheMissHandlerRuntimeEntry, 3);
// Discard arguments.
__ popl(EAX);
__ popl(EAX);
__ popl(EAX);
__ popl(EAX); // Return value from the runtime call (function).
__ popl(EDX); // Restore arguments descriptor.
__ popl(ECX); // Restore IC data.
__ LeaveFrame();
if (!FLAG_lazy_dispatchers) {
Label call_target_function;
GenerateDispatcherCode(assembler, &call_target_function);
__ Bind(&call_target_function);
}
__ movl(EBX, FieldAddress(EAX, Function::entry_point_offset()));
__ jmp(EBX);
}
// Called for inline allocation of arrays.
// Input parameters:
// EDX : Array length as Smi (must be preserved).
// ECX : array element type (either NULL or an instantiated type).
// Uses EAX, EBX, ECX, EDI as temporary registers.
// The newly allocated object is returned in EAX.
void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
Label slow_case;
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Compute the size to be allocated, it is based on the array length
// and is computed as:
// RoundedAllocationSize((array_length * kwordSize) + sizeof(RawArray)).
// Assert that length is a Smi.
__ testl(EDX, Immediate(kSmiTagMask));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(NOT_ZERO, &slow_case);
}
__ cmpl(EDX, Immediate(0));
__ j(LESS, &slow_case);
// Check for maximum allowed length.
const Immediate& max_len =
Immediate(reinterpret_cast<int32_t>(Smi::New(Array::kMaxElements)));
__ cmpl(EDX, max_len);
__ j(GREATER, &slow_case);
__ MaybeTraceAllocation(kArrayCid,
EAX,
&slow_case,
Assembler::kFarJump,
/* inline_isolate = */ false);
const intptr_t fixed_size = sizeof(RawArray) + kObjectAlignment - 1;
__ leal(EBX, Address(EDX, TIMES_2, fixed_size)); // EDX is Smi.
ASSERT(kSmiTagShift == 1);
__ andl(EBX, Immediate(-kObjectAlignment));
// ECX: array element type.
// EDX: array length as Smi.
// EBX: allocation size.
const intptr_t cid = kArrayCid;
Heap::Space space = Heap::SpaceForAllocation(cid);
__ movl(EDI, Address(THR, Thread::heap_offset()));
__ movl(EAX, Address(EDI, Heap::TopOffset(space)));
__ addl(EBX, EAX);
__ j(CARRY, &slow_case);
// Check if the allocation fits into the remaining space.
// EAX: potential new object start.
// EBX: potential next object start.
// EDI: heap.
// ECX: array element type.
// EDX: array length as Smi).
__ cmpl(EBX, Address(EDI, Heap::EndOffset(space)));
__ j(ABOVE_EQUAL, &slow_case);
// Successfully allocated the object(s), now update top to point to
// next object start and initialize the object.
__ movl(Address(EDI, Heap::TopOffset(space)), EBX);
__ subl(EBX, EAX);
__ addl(EAX, Immediate(kHeapObjectTag));
__ UpdateAllocationStatsWithSize(cid, EBX, EDI, space,
/* inline_isolate = */ false);
// Initialize the tags.
// EAX: new object start as a tagged pointer.
// EBX: allocation size.
// ECX: array element type.
// EDX: array length as Smi.
{
Label size_tag_overflow, done;
__ movl(EDI, EBX);
__ cmpl(EDI, Immediate(RawObject::SizeTag::kMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
__ shll(EDI, Immediate(RawObject::kSizeTagPos - kObjectAlignmentLog2));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&size_tag_overflow);
__ movl(EDI, Immediate(0));
__ Bind(&done);
// Get the class index and insert it into the tags.
__ orl(EDI, Immediate(RawObject::ClassIdTag::encode(cid)));
__ movl(FieldAddress(EAX, Array::tags_offset()), EDI); // Tags.
}
// EAX: new object start as a tagged pointer.
// EBX: allocation size.
// ECX: array element type.
// EDX: Array length as Smi (preserved).
// Store the type argument field.
__ InitializeFieldNoBarrier(EAX,
FieldAddress(EAX, Array::type_arguments_offset()),
ECX);
// Set the length field.
__ InitializeFieldNoBarrier(EAX,
FieldAddress(EAX, Array::length_offset()),
EDX);
// Initialize all array elements to raw_null.
// EAX: new object start as a tagged pointer.
// EBX: allocation size.
// EDI: iterator which initially points to the start of the variable
// data area to be initialized.
// ECX: array element type.
// EDX: array length as Smi.
__ leal(EBX, FieldAddress(EAX, EBX, TIMES_1, 0));
__ leal(EDI, FieldAddress(EAX, sizeof(RawArray)));
Label done;
Label init_loop;
__ Bind(&init_loop);
__ cmpl(EDI, EBX);
__ j(ABOVE_EQUAL, &done, Assembler::kNearJump);
// No generational barrier needed, since we are storing null.
__ InitializeFieldNoBarrier(EAX, Address(EDI, 0), Object::null_object());
__ addl(EDI, Immediate(kWordSize));
__ jmp(&init_loop, Assembler::kNearJump);
__ Bind(&done);
__ ret(); // returns the newly allocated object in EAX.
// Unable to allocate the array using the fast inline code, just call
// into the runtime.
__ Bind(&slow_case);
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EDX); // Array length as Smi.
__ pushl(ECX); // Element type.
__ CallRuntime(kAllocateArrayRuntimeEntry, 2);
__ popl(EAX); // Pop element type argument.
__ popl(EDX); // Pop array length argument (preserved).
__ popl(EAX); // Pop return value from return slot.
__ LeaveFrame();
__ ret();
}
// Called when invoking dart code from C++ (VM code).
// Input parameters:
// ESP : points to return address.
// ESP + 4 : code object of the dart function to call.
// ESP + 8 : arguments descriptor array.
// ESP + 12 : arguments array.
// ESP + 16 : current thread.
// Uses EAX, EDX, ECX, EDI as temporary registers.
void StubCode::GenerateInvokeDartCodeStub(Assembler* assembler) {
const intptr_t kTargetCodeOffset = 2 * kWordSize;
const intptr_t kArgumentsDescOffset = 3 * kWordSize;
const intptr_t kArgumentsOffset = 4 * kWordSize;
const intptr_t kThreadOffset = 5 * kWordSize;
// Save frame pointer coming in.
__ EnterFrame(0);
// Push code object to PC marker slot.
__ movl(EAX, Address(EBP, kThreadOffset));
__ pushl(Address(EAX, Thread::invoke_dart_code_stub_offset()));
// Save C++ ABI callee-saved registers.
__ pushl(EBX);
__ pushl(ESI);
__ pushl(EDI);
// Set up THR, which caches the current thread in Dart code.
__ movl(THR, EAX);
// Save the current VMTag on the stack.
__ movl(ECX, Assembler::VMTagAddress());
__ pushl(ECX);
// Mark that the thread is executing Dart code.
__ movl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
// Save top resource and top exit frame info. Use EDX as a temporary register.
// StackFrameIterator reads the top exit frame info saved in this frame.
__ movl(EDX, Address(THR, Thread::top_resource_offset()));
__ pushl(EDX);
__ movl(Address(THR, Thread::top_resource_offset()), Immediate(0));
// The constant kExitLinkSlotFromEntryFp must be kept in sync with the
// code below.
ASSERT(kExitLinkSlotFromEntryFp == -7);
__ movl(EDX, Address(THR, Thread::top_exit_frame_info_offset()));
__ pushl(EDX);
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), Immediate(0));
// Load arguments descriptor array into EDX.
__ movl(EDX, Address(EBP, kArgumentsDescOffset));
__ movl(EDX, Address(EDX, VMHandles::kOffsetOfRawPtrInHandle));
// Load number of arguments into EBX.
__ movl(EBX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ SmiUntag(EBX);
// Set up arguments for the dart call.
Label push_arguments;
Label done_push_arguments;
__ testl(EBX, EBX); // check if there are arguments.
__ j(ZERO, &done_push_arguments, Assembler::kNearJump);
__ movl(EAX, Immediate(0));
// Compute address of 'arguments array' data area into EDI.
__ movl(EDI, Address(EBP, kArgumentsOffset));
__ movl(EDI, Address(EDI, VMHandles::kOffsetOfRawPtrInHandle));
__ leal(EDI, FieldAddress(EDI, Array::data_offset()));
__ Bind(&push_arguments);
__ movl(ECX, Address(EDI, EAX, TIMES_4, 0));
__ pushl(ECX);
__ incl(EAX);
__ cmpl(EAX, EBX);
__ j(LESS, &push_arguments, Assembler::kNearJump);
__ Bind(&done_push_arguments);
// Call the dart code entrypoint.
__ movl(EAX, Address(EBP, kTargetCodeOffset));
__ movl(EAX, Address(EAX, VMHandles::kOffsetOfRawPtrInHandle));
__ call(FieldAddress(EAX, Code::entry_point_offset()));
// Reread the arguments descriptor array to obtain the number of passed
// arguments.
__ movl(EDX, Address(EBP, kArgumentsDescOffset));
__ movl(EDX, Address(EDX, VMHandles::kOffsetOfRawPtrInHandle));
__ movl(EDX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
// Get rid of arguments pushed on the stack.
__ leal(ESP, Address(ESP, EDX, TIMES_2, 0)); // EDX is a Smi.
// Restore the saved top exit frame info and top resource back into the
// Isolate structure.
__ popl(Address(THR, Thread::top_exit_frame_info_offset()));
__ popl(Address(THR, Thread::top_resource_offset()));
// Restore the current VMTag from the stack.
__ popl(Assembler::VMTagAddress());
// Restore C++ ABI callee-saved registers.
__ popl(EDI);
__ popl(ESI);
__ popl(EBX);
// Restore the frame pointer.
__ LeaveFrame();
__ ret();
}
// Called for inline allocation of contexts.
// Input:
// EDX: number of context variables.
// Output:
// EAX: new allocated RawContext object.
// EBX and EDX are destroyed.
void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
if (FLAG_inline_alloc) {
Label slow_case;
// First compute the rounded instance size.
// EDX: number of context variables.
intptr_t fixed_size = (sizeof(RawContext) + kObjectAlignment - 1);
__ leal(EBX, Address(EDX, TIMES_4, fixed_size));
__ andl(EBX, Immediate(-kObjectAlignment));
__ MaybeTraceAllocation(kContextCid,
EAX,
&slow_case,
Assembler::kFarJump,
/* inline_isolate = */ false);
// Now allocate the object.
// EDX: number of context variables.
const intptr_t cid = kContextCid;
Heap::Space space = Heap::SpaceForAllocation(cid);
__ movl(ECX, Address(THR, Thread::heap_offset()));
__ movl(EAX, Address(ECX, Heap::TopOffset(space)));
__ addl(EBX, EAX);
// Check if the allocation fits into the remaining space.
// EAX: potential new object.
// EBX: potential next object start.
// EDX: number of context variables.
__ cmpl(EBX, Address(ECX, Heap::EndOffset(space)));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
#if defined(DEBUG)
static const bool kJumpLength = Assembler::kFarJump;
#else
static const bool kJumpLength = Assembler::kNearJump;
#endif // DEBUG
__ j(ABOVE_EQUAL, &slow_case, kJumpLength);
}
// Successfully allocated the object, now update top to point to
// next object start and initialize the object.
// EAX: new object.
// EBX: next object start.
// EDX: number of context variables.
__ movl(Address(ECX, Heap::TopOffset(space)), EBX);
// EBX: Size of allocation in bytes.
__ subl(EBX, EAX);
__ addl(EAX, Immediate(kHeapObjectTag));
// Generate isolate-independent code to allow sharing between isolates.
__ UpdateAllocationStatsWithSize(cid, EBX, EDI, space,
/* inline_isolate = */ false);
// Calculate the size tag.
// EAX: new object.
// EDX: number of context variables.
{
Label size_tag_overflow, done;
__ leal(EBX, Address(EDX, TIMES_4, fixed_size));
__ andl(EBX, Immediate(-kObjectAlignment));
__ cmpl(EBX, Immediate(RawObject::SizeTag::kMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
__ shll(EBX, Immediate(RawObject::kSizeTagPos - kObjectAlignmentLog2));
__ jmp(&done);
__ Bind(&size_tag_overflow);
// Set overflow size tag value.
__ movl(EBX, Immediate(0));
__ Bind(&done);
// EAX: new object.
// EDX: number of context variables.
// EBX: size and bit tags.
__ orl(EBX,
Immediate(RawObject::ClassIdTag::encode(cid)));
__ movl(FieldAddress(EAX, Context::tags_offset()), EBX); // Tags.
}
// Setup up number of context variables field.
// EAX: new object.
// EDX: number of context variables as integer value (not object).
__ movl(FieldAddress(EAX, Context::num_variables_offset()), EDX);
// Setup the parent field.
// EAX: new object.
// EDX: number of context variables.
// No generational barrier needed, since we are storing null.
__ InitializeFieldNoBarrier(EAX,
FieldAddress(EAX, Context::parent_offset()),
Object::null_object());
// Initialize the context variables.
// EAX: new object.
// EDX: number of context variables.
{
Label loop, entry;
__ leal(EBX, FieldAddress(EAX, Context::variable_offset(0)));
__ jmp(&entry, Assembler::kNearJump);
__ Bind(&loop);
__ decl(EDX);
// No generational barrier needed, since we are storing null.
__ InitializeFieldNoBarrier(EAX,
Address(EBX, EDX, TIMES_4, 0),
Object::null_object());
__ Bind(&entry);
__ cmpl(EDX, Immediate(0));
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
}
// Done allocating and initializing the context.
// EAX: new object.
__ ret();
__ Bind(&slow_case);
}
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ SmiTag(EDX);
__ pushl(EDX);
__ CallRuntime(kAllocateContextRuntimeEntry, 1); // Allocate context.
__ popl(EAX); // Pop number of context variables argument.
__ popl(EAX); // Pop the new context object.
// EAX: new object
// Restore the frame pointer.
__ LeaveFrame();
__ ret();
}
// Helper stub to implement Assembler::StoreIntoObject.
// Input parameters:
// EDX: Address being stored
void StubCode::GenerateUpdateStoreBufferStub(Assembler* assembler) {
// Save values being destroyed.
__ pushl(EAX);
__ pushl(ECX);
Label add_to_buffer;
// Check whether this object has already been remembered. Skip adding to the
// store buffer if the object is in the store buffer already.
// Spilled: EAX, ECX
// EDX: Address being stored
Label reload;
__ Bind(&reload);
__ movl(EAX, FieldAddress(EDX, Object::tags_offset()));
__ testl(EAX, Immediate(1 << RawObject::kRememberedBit));
__ j(EQUAL, &add_to_buffer, Assembler::kNearJump);
__ popl(ECX);
__ popl(EAX);
__ ret();
// Update the tags that this object has been remembered.
// EDX: Address being stored
// EAX: Current tag value
__ Bind(&add_to_buffer);
__ movl(ECX, EAX);
__ orl(ECX, Immediate(1 << RawObject::kRememberedBit));
// Compare the tag word with EAX, update to ECX if unchanged.
__ LockCmpxchgl(FieldAddress(EDX, Object::tags_offset()), ECX);
__ j(NOT_EQUAL, &reload);
// Load the StoreBuffer block out of the thread. Then load top_ out of the
// StoreBufferBlock and add the address to the pointers_.
// Spilled: EAX, ECX
// EDX: Address being stored
__ movl(EAX, Address(THR, Thread::store_buffer_block_offset()));
__ movl(ECX, Address(EAX, StoreBufferBlock::top_offset()));
__ movl(Address(EAX, ECX, TIMES_4, StoreBufferBlock::pointers_offset()), EDX);
// Increment top_ and check for overflow.
// Spilled: EAX, ECX
// ECX: top_
// EAX: StoreBufferBlock
Label L;
__ incl(ECX);
__ movl(Address(EAX, StoreBufferBlock::top_offset()), ECX);
__ cmpl(ECX, Immediate(StoreBufferBlock::kSize));
// Restore values.
// Spilled: EAX, ECX
__ popl(ECX);
__ popl(EAX);
__ j(EQUAL, &L, Assembler::kNearJump);
__ ret();
// Handle overflow: Call the runtime leaf function.
__ Bind(&L);
// Setup frame, push callee-saved registers.
__ EnterCallRuntimeFrame(1 * kWordSize);
__ movl(Address(ESP, 0), THR); // Push the thread as the only argument.
__ CallRuntime(kStoreBufferBlockProcessRuntimeEntry, 1);
// Restore callee-saved registers, tear down frame.
__ LeaveCallRuntimeFrame();
__ ret();
}
// Called for inline allocation of objects.
// Input parameters:
// ESP + 4 : type arguments object (only if class is parameterized).
// ESP : points to return address.
// Uses EAX, EBX, ECX, EDX, EDI as temporary registers.
// Returns patch_code_pc offset where patching code for disabling the stub
// has been generated (similar to regularly generated Dart code).
void StubCode::GenerateAllocationStubForClass(
Assembler* assembler, const Class& cls) {
const intptr_t kObjectTypeArgumentsOffset = 1 * kWordSize;
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// The generated code is different if the class is parameterized.
const bool is_cls_parameterized = cls.NumTypeArguments() > 0;
ASSERT(!is_cls_parameterized ||
(cls.type_arguments_field_offset() != Class::kNoTypeArguments));
// kInlineInstanceSize is a constant used as a threshold for determining
// when the object initialization should be done as a loop or as
// straight line code.
const int kInlineInstanceSize = 12; // In words.
const intptr_t instance_size = cls.instance_size();
ASSERT(instance_size > 0);
if (is_cls_parameterized) {
__ movl(EDX, Address(ESP, kObjectTypeArgumentsOffset));
// EDX: instantiated type arguments.
}
Isolate* isolate = Isolate::Current();
if (FLAG_inline_alloc && Heap::IsAllocatableInNewSpace(instance_size) &&
!cls.TraceAllocation(isolate)) {
Label slow_case;
// Allocate the object and update top to point to
// next object start and initialize the allocated object.
// EDX: instantiated type arguments (if is_cls_parameterized).
Heap::Space space = Heap::SpaceForAllocation(cls.id());
__ movl(EDI, Address(THR, Thread::heap_offset()));
__ movl(EAX, Address(EDI, Heap::TopOffset(space)));
__ leal(EBX, Address(EAX, instance_size));
// Check if the allocation fits into the remaining space.
// EAX: potential new object start.
// EBX: potential next object start.
// EDI: heap.
__ cmpl(EBX, Address(EDI, Heap::EndOffset(space)));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(ABOVE_EQUAL, &slow_case);
}
__ movl(Address(EDI, Heap::TopOffset(space)), EBX);
__ UpdateAllocationStats(cls.id(), ECX, space,
/* inline_isolate = */ false);
// EAX: new object start (untagged).
// EBX: next object start.
// EDX: new object type arguments (if is_cls_parameterized).
// Set the tags.
uword tags = 0;
tags = RawObject::SizeTag::update(instance_size, tags);
ASSERT(cls.id() != kIllegalCid);
tags = RawObject::ClassIdTag::update(cls.id(), tags);
__ movl(Address(EAX, Instance::tags_offset()), Immediate(tags));
__ addl(EAX, Immediate(kHeapObjectTag));
// Initialize the remaining words of the object.
// EAX: new object (tagged).
// EBX: next object start.
// EDX: new object type arguments (if is_cls_parameterized).
// First try inlining the initialization without a loop.
if (instance_size < (kInlineInstanceSize * kWordSize)) {
// Check if the object contains any non-header fields.
// Small objects are initialized using a consecutive set of writes.
for (intptr_t current_offset = Instance::NextFieldOffset();
current_offset < instance_size;
current_offset += kWordSize) {
__ InitializeFieldNoBarrier(EAX,
FieldAddress(EAX, current_offset),
Object::null_object());
}
} else {
__ leal(ECX, FieldAddress(EAX, Instance::NextFieldOffset()));
// Loop until the whole object is initialized.
// EAX: new object (tagged).
// EBX: next object start.
// ECX: next word to be initialized.
// EDX: new object type arguments (if is_cls_parameterized).
Label init_loop;
Label done;
__ Bind(&init_loop);
__ cmpl(ECX, EBX);
__ j(ABOVE_EQUAL, &done, Assembler::kNearJump);
__ InitializeFieldNoBarrier(EAX,
Address(ECX, 0),
Object::null_object());
__ addl(ECX, Immediate(kWordSize));
__ jmp(&init_loop, Assembler::kNearJump);
__ Bind(&done);
}
if (is_cls_parameterized) {
// EDX: new object type arguments.
// Set the type arguments in the new object.
intptr_t offset = cls.type_arguments_field_offset();
// TODO(koda): Figure out why previous content is sometimes null here.
__ InitializeFieldNoBarrier(EAX, FieldAddress(EAX, offset), EDX);
}
// Done allocating and initializing the instance.
// EAX: new object (tagged).
__ ret();
__ Bind(&slow_case);
}
// If is_cls_parameterized:
// EDX: new object type arguments.
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ PushObject(cls); // Push class of object to be allocated.
if (is_cls_parameterized) {
__ pushl(EDX); // Push type arguments of object to be allocated.
} else {
__ pushl(raw_null); // Push null type arguments.
}
__ CallRuntime(kAllocateObjectRuntimeEntry, 2); // Allocate object.
__ popl(EAX); // Pop argument (type arguments of object).
__ popl(EAX); // Pop argument (class of object).
__ popl(EAX); // Pop result (newly allocated object).
// EAX: new object
// Restore the frame pointer.
__ LeaveFrame();
__ ret();
}
// Called for invoking "dynamic noSuchMethod(Invocation invocation)" function
// from the entry code of a dart function after an error in passed argument
// name or number is detected.
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of last argument.
// EDX : arguments descriptor array.
// Uses EAX, EBX, EDI as temporary registers.
void StubCode::GenerateCallClosureNoSuchMethodStub(Assembler* assembler) {
__ EnterStubFrame();
// Load the receiver.
__ movl(EDI, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EAX, Address(EBP, EDI, TIMES_2, kParamEndSlotFromFp * kWordSize));
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ pushl(raw_null); // Setup space on stack for result from noSuchMethod.
__ pushl(EAX); // Receiver.
__ pushl(EDX); // Arguments descriptor array.
__ movl(EDX, EDI);
// EDX: Smi-tagged arguments array length.
PushArgumentsArray(assembler);
const intptr_t kNumArgs = 3;
__ CallRuntime(kInvokeClosureNoSuchMethodRuntimeEntry, kNumArgs);
// noSuchMethod on closures always throws an error, so it will never return.
__ int3();
}
// Cannot use function object from ICData as it may be the inlined
// function and not the top-scope function.
void StubCode::GenerateOptimizedUsageCounterIncrement(Assembler* assembler) {
Register ic_reg = ECX;
Register func_reg = EBX;
if (FLAG_trace_optimized_ic_calls) {
__ EnterStubFrame();
__ pushl(func_reg); // Preserve
__ pushl(ic_reg); // Preserve.
__ pushl(ic_reg); // Argument.
__ pushl(func_reg); // Argument.
__ CallRuntime(kTraceICCallRuntimeEntry, 2);
__ popl(EAX); // Discard argument;
__ popl(EAX); // Discard argument;
__ popl(ic_reg); // Restore.
__ popl(func_reg); // Restore.
__ LeaveFrame();
}
__ incl(FieldAddress(func_reg, Function::usage_counter_offset()));
}
// Loads function into 'temp_reg'.
void StubCode::GenerateUsageCounterIncrement(Assembler* assembler,
Register temp_reg) {
if (FLAG_optimization_counter_threshold >= 0) {
Register ic_reg = ECX;
Register func_reg = temp_reg;
ASSERT(ic_reg != func_reg);
__ Comment("Increment function counter");
__ movl(func_reg, FieldAddress(ic_reg, ICData::owner_offset()));
__ incl(FieldAddress(func_reg, Function::usage_counter_offset()));
}
}
// Note: ECX must be preserved.
// Attempt a quick Smi operation for known operations ('kind'). The ICData
// must have been primed with a Smi/Smi check that will be used for counting
// the invocations.
static void EmitFastSmiOp(Assembler* assembler,
Token::Kind kind,
intptr_t num_args,
Label* not_smi_or_overflow) {
__ Comment("Fast Smi op");
ASSERT(num_args == 2);
__ movl(EDI, Address(ESP, + 1 * kWordSize)); // Right
__ movl(EAX, Address(ESP, + 2 * kWordSize)); // Left
__ movl(EBX, EDI);
__ orl(EBX, EAX);
__ testl(EBX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, not_smi_or_overflow, Assembler::kNearJump);
switch (kind) {
case Token::kADD: {
__ addl(EAX, EDI);
__ j(OVERFLOW, not_smi_or_overflow, Assembler::kNearJump);
break;
}
case Token::kSUB: {
__ subl(EAX, EDI);
__ j(OVERFLOW, not_smi_or_overflow, Assembler::kNearJump);
break;
}
case Token::kMUL: {
__ SmiUntag(EAX);
__ imull(EAX, EDI);
__ j(OVERFLOW, not_smi_or_overflow, Assembler::kNearJump);
break;
}
case Token::kEQ: {
Label done, is_true;
__ cmpl(EAX, EDI);
__ j(EQUAL, &is_true, Assembler::kNearJump);
__ LoadObject(EAX, Bool::False());
__ jmp(&done, Assembler::kNearJump);
__ Bind(&is_true);
__ LoadObject(EAX, Bool::True());
__ Bind(&done);
break;
}
default: UNIMPLEMENTED();
}
// ECX: IC data object.
__ movl(EBX, FieldAddress(ECX, ICData::ic_data_offset()));
// EBX: ic_data_array with check entries: classes and target functions.
__ leal(EBX, FieldAddress(EBX, Array::data_offset()));
#if defined(DEBUG)
// Check that first entry is for Smi/Smi.
Label error, ok;
const Immediate& imm_smi_cid =
Immediate(reinterpret_cast<intptr_t>(Smi::New(kSmiCid)));
__ cmpl(Address(EBX, 0 * kWordSize), imm_smi_cid);
__ j(NOT_EQUAL, &error, Assembler::kNearJump);
__ cmpl(Address(EBX, 1 * kWordSize), imm_smi_cid);
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Bind(&error);
__ Stop("Incorrect IC data");
__ Bind(&ok);
#endif
if (FLAG_optimization_counter_threshold >= 0) {
// Update counter.
const intptr_t count_offset = ICData::CountIndexFor(num_args) * kWordSize;
__ movl(ECX, Address(EBX, count_offset));
__ addl(ECX, Immediate(Smi::RawValue(1)));
__ movl(EDI, Immediate(Smi::RawValue(Smi::kMaxValue)));
__ cmovno(EDI, ECX);
__ StoreIntoSmiField(Address(EBX, count_offset), EDI);
}
__ ret();
}
// Generate inline cache check for 'num_args'.
// ECX: Inline cache data object.
// TOS(0): return address
// Control flow:
// - If receiver is null -> jump to IC miss.
// - If receiver is Smi -> load Smi class.
// - If receiver is not-Smi -> load receiver's class.
// - Check if 'num_args' (including receiver) match any IC data group.
// - Match found -> jump to target.
// - Match not found -> jump to IC miss.
void StubCode::GenerateNArgsCheckInlineCacheStub(
Assembler* assembler,
intptr_t num_args,
const RuntimeEntry& handle_ic_miss,
Token::Kind kind,
RangeCollectionMode range_collection_mode,
bool optimized) {
ASSERT(num_args > 0);
#if defined(DEBUG)
{ Label ok;
// Check that the IC data array has NumArgsTested() == num_args.
// 'NumArgsTested' is stored in the least significant bits of 'state_bits'.
__ movl(EBX, FieldAddress(ECX, ICData::state_bits_offset()));
ASSERT(ICData::NumArgsTestedShift() == 0); // No shift needed.
__ andl(EBX, Immediate(ICData::NumArgsTestedMask()));
__ cmpl(EBX, Immediate(num_args));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Incorrect stub for IC data");
__ Bind(&ok);
}
#endif // DEBUG
Label stepping, done_stepping;
if (FLAG_support_debugger && !optimized) {
__ Comment("Check single stepping");
__ LoadIsolate(EAX);
__ cmpb(Address(EAX, Isolate::single_step_offset()), Immediate(0));
__ j(NOT_EQUAL, &stepping);
__ Bind(&done_stepping);
}
__ Comment("Range feedback collection");
Label not_smi_or_overflow;
if (range_collection_mode == kCollectRanges) {
ASSERT((num_args == 1) || (num_args == 2));
if (num_args == 2) {
__ movl(EAX, Address(ESP, + 2 * kWordSize));
__ UpdateRangeFeedback(EAX, 0, ECX, EBX, EDI, EDX, &not_smi_or_overflow);
}
__ movl(EAX, Address(ESP, + 1 * kWordSize));
__ UpdateRangeFeedback(EAX, (num_args - 1), ECX, EBX, EDI, EDX,
&not_smi_or_overflow);
}
if (kind != Token::kILLEGAL) {
EmitFastSmiOp(assembler, kind, num_args, &not_smi_or_overflow);
}
__ Bind(&not_smi_or_overflow);
__ Comment("Extract ICData initial values and receiver cid");
// ECX: IC data object (preserved).
// Load arguments descriptor into EDX.
__ movl(EDX, FieldAddress(ECX, ICData::arguments_descriptor_offset()));
// Loop that checks if there is an IC data match.
// ECX: IC data object (preserved).
__ movl(EBX, FieldAddress(ECX, ICData::ic_data_offset()));
// EBX: ic_data_array with check entries: classes and target functions.
__ leal(EBX, FieldAddress(EBX, Array::data_offset()));
// EBX: points directly to the first ic data array element.
// Get the receiver's class ID (first read number of arguments from
// arguments descriptor array and then access the receiver from the stack).
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EDI, Address(ESP, EAX, TIMES_2, 0)); // EAX (argument_count) is smi.
__ LoadTaggedClassIdMayBeSmi(EAX, EDI);
// EAX: receiver's class ID (smi).
__ movl(EDI, Address(EBX, 0)); // First class id (smi) to check.
Label loop, update, test, found;
__ jmp(&test);
__ Comment("ICData loop");
__ Bind(&loop);
for (int i = 0; i < num_args; i++) {
if (i > 0) {
// If not the first, load the next argument's class ID.
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EDI, Address(ESP, EAX, TIMES_2, - i * kWordSize));
__ LoadTaggedClassIdMayBeSmi(EAX, EDI);
// EAX: next argument class ID (smi).
__ movl(EDI, Address(EBX, i * kWordSize));
// EDI: next class ID to check (smi).
}
__ cmpl(EAX, EDI); // Class id match?
if (i < (num_args - 1)) {
__ j(NOT_EQUAL, &update); // Continue.
} else {
// Last check, all checks before matched.
__ j(EQUAL, &found); // Break.
}
}
__ Bind(&update);
// Reload receiver class ID. It has not been destroyed when num_args == 1.
if (num_args > 1) {
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EDI, Address(ESP, EAX, TIMES_2, 0));
__ LoadTaggedClassIdMayBeSmi(EAX, EDI);
}
const intptr_t entry_size = ICData::TestEntryLengthFor(num_args) * kWordSize;
__ addl(EBX, Immediate(entry_size)); // Next entry.
__ movl(EDI, Address(EBX, 0)); // Next class ID.
__ Bind(&test);
__ cmpl(EDI, Immediate(Smi::RawValue(kIllegalCid))); // Done?
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
__ Comment("IC miss");
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Compute address of arguments (first read number of arguments from
// arguments descriptor array and then compute address on the stack).
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ leal(EAX, Address(ESP, EAX, TIMES_2, 0)); // EAX is Smi.
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve IC data object.
__ pushl(raw_null); // Setup space on stack for result (target code object).
// Push call arguments.
for (intptr_t i = 0; i < num_args; i++) {
__ movl(EBX, Address(EAX, -kWordSize * i));
__ pushl(EBX);
}
__ pushl(ECX); // Pass IC data object.
__ CallRuntime(handle_ic_miss, num_args + 1);
// Remove the call arguments pushed earlier, including the IC data object.
for (intptr_t i = 0; i < num_args + 1; i++) {
__ popl(EAX);
}
__ popl(EAX); // Pop returned function object into EAX.
__ popl(ECX); // Restore IC data array.
__ popl(EDX); // Restore arguments descriptor array.
__ LeaveFrame();
Label call_target_function;
if (!FLAG_lazy_dispatchers) {
GenerateDispatcherCode(assembler, &call_target_function);
} else {
__ jmp(&call_target_function);
}
__ Bind(&found);
// EBX: Pointer to an IC data check group.
const intptr_t target_offset = ICData::TargetIndexFor(num_args) * kWordSize;
const intptr_t count_offset = ICData::CountIndexFor(num_args) * kWordSize;
if (FLAG_optimization_counter_threshold >= 0) {
__ Comment("Update caller's counter");
__ movl(EAX, Address(EBX, count_offset));
__ addl(EAX, Immediate(Smi::RawValue(1)));
__ movl(EDI, Immediate(Smi::RawValue(Smi::kMaxValue)));
__ cmovno(EDI, EAX);
__ StoreIntoSmiField(Address(EBX, count_offset), EDI);
}
__ movl(EAX, Address(EBX, target_offset));
__ Bind(&call_target_function);
__ Comment("Call target");
// EAX: Target function.
__ movl(EBX, FieldAddress(EAX, Function::entry_point_offset()));
if (range_collection_mode == kCollectRanges) {
__ EnterStubFrame();
__ pushl(ECX);
const intptr_t arg_offset_words = num_args +
Assembler::kEnterStubFramePushedWords +
1; // ECX
for (intptr_t i = 0; i < num_args; i++) {
__ movl(EDI, Address(ESP, arg_offset_words * kWordSize));
__ pushl(EDI);
}
__ call(EBX);
__ movl(ECX, Address(EBP, kFirstLocalSlotFromFp * kWordSize));
Label done;
__ UpdateRangeFeedback(EAX, 2, ECX, EBX, EDI, EDX, &done);
__ Bind(&done);
__ LeaveFrame();
__ ret();
} else {
__ jmp(EBX);
}
if (FLAG_support_debugger && !optimized) {
__ Bind(&stepping);
__ EnterStubFrame();
__ pushl(ECX);
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ popl(ECX);
__ LeaveFrame();
__ jmp(&done_stepping);
}
}
// Use inline cache data array to invoke the target or continue in inline
// cache miss handler. Stub for 1-argument check (receiver class).
// ECX: Inline cache data object.
// TOS(0): Return address.
// Inline cache data object structure:
// 0: function-name
// 1: N, number of arguments checked.
// 2 .. (length - 1): group of checks, each check containing:
// - N classes.
// - 1 target function.
void StubCode::GenerateOneArgCheckInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 1,
kInlineCacheMissHandlerOneArgRuntimeEntry,
Token::kILLEGAL,
kIgnoreRanges);
}
void StubCode::GenerateTwoArgsCheckInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 2,
kInlineCacheMissHandlerTwoArgsRuntimeEntry,
Token::kILLEGAL,
kIgnoreRanges);
}
void StubCode::GenerateSmiAddInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 2,
kInlineCacheMissHandlerTwoArgsRuntimeEntry,
Token::kADD,
kCollectRanges);
}
void StubCode::GenerateSmiSubInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 2,
kInlineCacheMissHandlerTwoArgsRuntimeEntry,
Token::kSUB,
kCollectRanges);
}
void StubCode::GenerateSmiEqualInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 2,
kInlineCacheMissHandlerTwoArgsRuntimeEntry,
Token::kEQ,
kIgnoreRanges);
}
void StubCode::GenerateUnaryRangeCollectingInlineCacheStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 1,
kInlineCacheMissHandlerOneArgRuntimeEntry,
Token::kILLEGAL,
kCollectRanges);
}
void StubCode::GenerateBinaryRangeCollectingInlineCacheStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 2,
kInlineCacheMissHandlerTwoArgsRuntimeEntry,
Token::kILLEGAL,
kCollectRanges);
}
// Use inline cache data array to invoke the target or continue in inline
// cache miss handler. Stub for 1-argument check (receiver class).
// EDI: function which counter needs to be incremented.
// ECX: Inline cache data object.
// TOS(0): Return address.
// Inline cache data object structure:
// 0: function-name
// 1: N, number of arguments checked.
// 2 .. (length - 1): group of checks, each check containing:
// - N classes.
// - 1 target function.
void StubCode::GenerateOneArgOptimizedCheckInlineCacheStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(assembler, 1,
kInlineCacheMissHandlerOneArgRuntimeEntry,
Token::kILLEGAL,
kIgnoreRanges,
true /* optimized */);
}
void StubCode::GenerateTwoArgsOptimizedCheckInlineCacheStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(assembler, 2,
kInlineCacheMissHandlerTwoArgsRuntimeEntry,
Token::kILLEGAL,
kIgnoreRanges,
true /* optimized */);
}
// Intermediary stub between a static call and its target. ICData contains
// the target function and the call count.
// ECX: ICData
void StubCode::GenerateZeroArgsUnoptimizedStaticCallStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
#if defined(DEBUG)
{ Label ok;
// Check that the IC data array has NumArgsTested() == num_args.
// 'NumArgsTested' is stored in the least significant bits of 'state_bits'.
__ movl(EBX, FieldAddress(ECX, ICData::state_bits_offset()));
ASSERT(ICData::NumArgsTestedShift() == 0); // No shift needed.
__ andl(EBX, Immediate(ICData::NumArgsTestedMask()));
__ cmpl(EBX, Immediate(0));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Incorrect IC data for unoptimized static call");
__ Bind(&ok);
}
#endif // DEBUG
// Check single stepping.
Label stepping, done_stepping;
if (FLAG_support_debugger) {
__ LoadIsolate(EAX);
__ cmpb(Address(EAX, Isolate::single_step_offset()), Immediate(0));
__ j(NOT_EQUAL, &stepping, Assembler::kNearJump);
__ Bind(&done_stepping);
}
// ECX: IC data object (preserved).
__ movl(EBX, FieldAddress(ECX, ICData::ic_data_offset()));
// EBX: ic_data_array with entries: target functions and count.
__ leal(EBX, FieldAddress(EBX, Array::data_offset()));
// EBX: points directly to the first ic data array element.
const intptr_t target_offset = ICData::TargetIndexFor(0) * kWordSize;
const intptr_t count_offset = ICData::CountIndexFor(0) * kWordSize;
if (FLAG_optimization_counter_threshold >= 0) {
// Increment count for this call.
__ movl(EAX, Address(EBX, count_offset));
__ addl(EAX, Immediate(Smi::RawValue(1)));
__ movl(EDI, Immediate(Smi::RawValue(Smi::kMaxValue)));
__ cmovno(EDI, EAX);
__ StoreIntoSmiField(Address(EBX, count_offset), EDI);
}
// Load arguments descriptor into EDX.
__ movl(EDX, FieldAddress(ECX, ICData::arguments_descriptor_offset()));
// Get function and call it, if possible.
__ movl(EAX, Address(EBX, target_offset));
__ movl(EBX, FieldAddress(EAX, Function::entry_point_offset()));
__ jmp(EBX);
if (FLAG_support_debugger) {
__ Bind(&stepping);
__ EnterStubFrame();
__ pushl(ECX);
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ popl(ECX);
__ LeaveFrame();
__ jmp(&done_stepping, Assembler::kNearJump);
}
}
void StubCode::GenerateOneArgUnoptimizedStaticCallStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kStaticCallMissHandlerOneArgRuntimeEntry,
Token::kILLEGAL,
kIgnoreRanges);
}
void StubCode::GenerateTwoArgsUnoptimizedStaticCallStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(assembler, 2,
kStaticCallMissHandlerTwoArgsRuntimeEntry,
Token::kILLEGAL,
kIgnoreRanges);
}
// Stub for compiling a function and jumping to the compiled code.
// ECX: IC-Data (for methods).
// EDX: Arguments descriptor.
// EAX: Function.
void StubCode::GenerateLazyCompileStub(Assembler* assembler) {
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve IC data object.
__ pushl(EAX); // Pass function.
__ CallRuntime(kCompileFunctionRuntimeEntry, 1);
__ popl(EAX); // Restore function.
__ popl(ECX); // Restore IC data array.
__ popl(EDX); // Restore arguments descriptor array.
__ LeaveFrame();
__ movl(EAX, FieldAddress(EAX, Function::entry_point_offset()));
__ jmp(EAX);
}
// ECX: Contains an ICData.
void StubCode::GenerateICCallBreakpointStub(Assembler* assembler) {
__ EnterStubFrame();
// Save IC data.
__ pushl(ECX);
// Room for result. Debugger stub returns address of the
// unpatched runtime stub.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ pushl(raw_null); // Room for result.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ popl(EAX); // Code of original stub.
__ popl(ECX); // Restore IC data.
__ LeaveFrame();
// Jump to original stub.
__ movl(EAX, FieldAddress(EAX, Code::entry_point_offset()));
__ jmp(EAX);
}
void StubCode::GenerateRuntimeCallBreakpointStub(Assembler* assembler) {
__ EnterStubFrame();
// Room for result. Debugger stub returns address of the
// unpatched runtime stub.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ pushl(raw_null); // Room for result.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ popl(EAX); // Code of the original stub
__ LeaveFrame();
// Jump to original stub.
__ movl(EAX, FieldAddress(EAX, Code::entry_point_offset()));
__ jmp(EAX);
}
// Called only from unoptimized code.
void StubCode::GenerateDebugStepCheckStub(Assembler* assembler) {
// Check single stepping.
Label stepping, done_stepping;
__ LoadIsolate(EAX);
__ movzxb(EAX, Address(EAX, Isolate::single_step_offset()));
__ cmpl(EAX, Immediate(0));
__ j(NOT_EQUAL, &stepping, Assembler::kNearJump);
__ Bind(&done_stepping);
__ ret();
__ Bind(&stepping);
__ EnterStubFrame();
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ LeaveFrame();
__ jmp(&done_stepping, Assembler::kNearJump);
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments (can be NULL).
// TOS + 2: instance.
// TOS + 3: SubtypeTestCache.
// Result in ECX: null -> not found, otherwise result (true or false).
static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
ASSERT((1 <= n) && (n <= 3));
const intptr_t kInstantiatorTypeArgumentsInBytes = 1 * kWordSize;
const intptr_t kInstanceOffsetInBytes = 2 * kWordSize;
const intptr_t kCacheOffsetInBytes = 3 * kWordSize;
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(EAX, Address(ESP, kInstanceOffsetInBytes));
if (n > 1) {
// Get instance type arguments.
__ LoadClass(ECX, EAX, EBX);
// Compute instance type arguments into EBX.
Label has_no_type_arguments;
__ movl(EBX, raw_null);
__ movl(EDI, FieldAddress(ECX,
Class::type_arguments_field_offset_in_words_offset()));
__ cmpl(EDI, Immediate(Class::kNoTypeArguments));
__ j(EQUAL, &has_no_type_arguments, Assembler::kNearJump);
__ movl(EBX, FieldAddress(EAX, EDI, TIMES_4, 0));
__ Bind(&has_no_type_arguments);
}
__ LoadClassId(ECX, EAX);
// EAX: instance, ECX: instance class id.
// EBX: instance type arguments (null if none), used only if n > 1.
__ movl(EDX, Address(ESP, kCacheOffsetInBytes));
// EDX: SubtypeTestCache.
__ movl(EDX, FieldAddress(EDX, SubtypeTestCache::cache_offset()));
__ addl(EDX, Immediate(Array::data_offset() - kHeapObjectTag));
Label loop, found, not_found, next_iteration;
// EDX: Entry start.
// ECX: instance class id.
// EBX: instance type arguments.
__ SmiTag(ECX);
__ cmpl(ECX, Immediate(Smi::RawValue(kClosureCid)));
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
__ movl(ECX, FieldAddress(EAX, Closure::function_offset()));
// ECX: instance class id as Smi or function.
__ Bind(&loop);
__ movl(EDI,
Address(EDX,
kWordSize * SubtypeTestCache::kInstanceClassIdOrFunction));
__ cmpl(EDI, raw_null);
__ j(EQUAL, &not_found, Assembler::kNearJump);
__ cmpl(EDI, ECX);
if (n == 1) {
__ j(EQUAL, &found, Assembler::kNearJump);
} else {
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ movl(EDI,
Address(EDX, kWordSize * SubtypeTestCache::kInstanceTypeArguments));
__ cmpl(EDI, EBX);
if (n == 2) {
__ j(EQUAL, &found, Assembler::kNearJump);
} else {
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ movl(EDI,
Address(EDX, kWordSize *
SubtypeTestCache::kInstantiatorTypeArguments));
__ cmpl(EDI, Address(ESP, kInstantiatorTypeArgumentsInBytes));
__ j(EQUAL, &found, Assembler::kNearJump);
}
}
__ Bind(&next_iteration);
__ addl(EDX, Immediate(kWordSize * SubtypeTestCache::kTestEntryLength));
__ jmp(&loop, Assembler::kNearJump);
// Fall through to not found.
__ Bind(&not_found);
__ movl(ECX, raw_null);
__ ret();
__ Bind(&found);
__ movl(ECX, Address(EDX, kWordSize * SubtypeTestCache::kTestResult));
__ ret();
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments or NULL.
// TOS + 2: instance.
// TOS + 3: cache array.
// Result in ECX: null -> not found, otherwise result (true or false).
void StubCode::GenerateSubtype1TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 1);
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments or NULL.
// TOS + 2: instance.
// TOS + 3: cache array.
// Result in ECX: null -> not found, otherwise result (true or false).
void StubCode::GenerateSubtype2TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 2);
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments.
// TOS + 2: instance.
// TOS + 3: cache array.
// Result in ECX: null -> not found, otherwise result (true or false).
void StubCode::GenerateSubtype3TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 3);
}
// Return the current stack pointer address, used to do stack alignment checks.
// TOS + 0: return address
// Result in EAX.
void StubCode::GenerateGetStackPointerStub(Assembler* assembler) {
__ leal(EAX, Address(ESP, kWordSize));
__ ret();
}
// Jump to the exception or error handler.
// TOS + 0: return address
// TOS + 1: program_counter
// TOS + 2: stack_pointer
// TOS + 3: frame_pointer
// TOS + 4: exception object
// TOS + 5: stacktrace object
// TOS + 6: thread
// No Result.
void StubCode::GenerateJumpToExceptionHandlerStub(Assembler* assembler) {
ASSERT(kExceptionObjectReg == EAX);
ASSERT(kStackTraceObjectReg == EDX);
__ movl(THR, Address(ESP, 6 * kWordSize)); // Load target thread.
__ movl(kStackTraceObjectReg, Address(ESP, 5 * kWordSize));
__ movl(kExceptionObjectReg, Address(ESP, 4 * kWordSize));
__ movl(EBP, Address(ESP, 3 * kWordSize)); // Load target frame_pointer.
__ movl(EBX, Address(ESP, 1 * kWordSize)); // Load target PC into EBX.
__ movl(ESP, Address(ESP, 2 * kWordSize)); // Load target stack_pointer.
// Set tag.
__ movl(Assembler::VMTagAddress(), Immediate(VMTag::kDartTagId));
// Clear top exit frame.
__ movl(Address(THR, Thread::top_exit_frame_info_offset()), Immediate(0));
__ jmp(EBX); // Jump to the exception handler code.
}
// Calls to the runtime to optimize the given function.
// EBX: function to be reoptimized.
// EDX: argument descriptor (preserved).
void StubCode::GenerateOptimizeFunctionStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ EnterStubFrame();
__ pushl(EDX);
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EBX);
__ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);
__ popl(EAX); // Discard argument.
__ popl(EAX); // Get Code object
__ popl(EDX); // Restore argument descriptor.
__ movl(EAX, FieldAddress(EAX, Code::entry_point_offset()));
__ LeaveFrame();
__ jmp(EAX);
__ int3();
}
// Does identical check (object references are equal or not equal) with special
// checks for boxed numbers.
// Return ZF set.
// Note: A Mint cannot contain a value that would fit in Smi, a Bigint
// cannot contain a value that fits in Mint or Smi.
static void GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
const Register left,
const Register right,
const Register temp) {
Label reference_compare, done, check_mint, check_bigint;
// If any of the arguments is Smi do reference compare.
__ testl(left, Immediate(kSmiTagMask));
__ j(ZERO, &reference_compare, Assembler::kNearJump);
__ testl(right, Immediate(kSmiTagMask));
__ j(ZERO, &reference_compare, Assembler::kNearJump);
// Value compare for two doubles.
__ CompareClassId(left, kDoubleCid, temp);
__ j(NOT_EQUAL, &check_mint, Assembler::kNearJump);
__ CompareClassId(right, kDoubleCid, temp);
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
// Double values bitwise compare.
__ movl(temp, FieldAddress(left, Double::value_offset() + 0 * kWordSize));
__ cmpl(temp, FieldAddress(right, Double::value_offset() + 0 * kWordSize));
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ movl(temp, FieldAddress(left, Double::value_offset() + 1 * kWordSize));
__ cmpl(temp, FieldAddress(right, Double::value_offset() + 1 * kWordSize));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&check_mint);
__ CompareClassId(left, kMintCid, temp);
__ j(NOT_EQUAL, &check_bigint, Assembler::kNearJump);
__ CompareClassId(right, kMintCid, temp);
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ movl(temp, FieldAddress(left, Mint::value_offset() + 0 * kWordSize));
__ cmpl(temp, FieldAddress(right, Mint::value_offset() + 0 * kWordSize));
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ movl(temp, FieldAddress(left, Mint::value_offset() + 1 * kWordSize));
__ cmpl(temp, FieldAddress(right, Mint::value_offset() + 1 * kWordSize));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&check_bigint);
__ CompareClassId(left, kBigintCid, temp);
__ j(NOT_EQUAL, &reference_compare, Assembler::kNearJump);
__ CompareClassId(right, kBigintCid, temp);
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(2 * kWordSize);
__ movl(Address(ESP, 1 * kWordSize), left);
__ movl(Address(ESP, 0 * kWordSize), right);
__ CallRuntime(kBigintCompareRuntimeEntry, 2);
// Result in EAX, 0 means equal.
__ LeaveFrame();
__ cmpl(EAX, Immediate(0));
__ jmp(&done);
__ Bind(&reference_compare);
__ cmpl(left, right);
__ Bind(&done);
}
// Called only from unoptimized code. All relevant registers have been saved.
// TOS + 0: return address
// TOS + 1: right argument.
// TOS + 2: left argument.
// Returns ZF set.
void StubCode::GenerateUnoptimizedIdenticalWithNumberCheckStub(
Assembler* assembler) {
// Check single stepping.
Label stepping, done_stepping;
if (FLAG_support_debugger) {
__ LoadIsolate(EAX);
__ movzxb(EAX, Address(EAX, Isolate::single_step_offset()));
__ cmpl(EAX, Immediate(0));
__ j(NOT_EQUAL, &stepping);
__ Bind(&done_stepping);
}
const Register left = EAX;
const Register right = EDX;
const Register temp = ECX;
__ movl(left, Address(ESP, 2 * kWordSize));
__ movl(right, Address(ESP, 1 * kWordSize));
GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp);
__ ret();
if (FLAG_support_debugger) {
__ Bind(&stepping);
__ EnterStubFrame();
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ LeaveFrame();
__ jmp(&done_stepping);
}
}
// Called from optimized code only.
// TOS + 0: return address
// TOS + 1: right argument.
// TOS + 2: left argument.
// Returns ZF set.
void StubCode::GenerateOptimizedIdenticalWithNumberCheckStub(
Assembler* assembler) {
const Register left = EAX;
const Register right = EDX;
const Register temp = ECX;
__ movl(left, Address(ESP, 2 * kWordSize));
__ movl(right, Address(ESP, 1 * kWordSize));
GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp);
__ ret();
}
void StubCode::EmitMegamorphicLookup(Assembler* assembler) {
__ LoadTaggedClassIdMayBeSmi(EAX, EBX);
// EAX: class ID of the receiver (smi).
__ movl(EDI, FieldAddress(ECX, MegamorphicCache::buckets_offset()));
__ movl(EBX, FieldAddress(ECX, MegamorphicCache::mask_offset()));
// EDI: cache buckets array.
// EBX: mask.
__ pushl(ECX); // Spill MegamorphicCache.
__ movl(ECX, EAX);
// ECX: probe.
Label loop, update, load_target_function;
__ jmp(&loop);
__ Bind(&update);
__ addl(ECX, Immediate(Smi::RawValue(1)));
__ Bind(&loop);
__ andl(ECX, EBX);
const intptr_t base = Array::data_offset();
// ECX is smi tagged, but table entries are two words, so TIMES_4.
__ movl(EDX, FieldAddress(EDI, ECX, TIMES_4, base));
ASSERT(kIllegalCid == 0);
__ testl(EDX, EDX);
__ j(ZERO, &load_target_function, Assembler::kNearJump);
__ cmpl(EDX, EAX);
__ j(NOT_EQUAL, &update, Assembler::kNearJump);
__ Bind(&load_target_function);
// Call the target found in the cache. For a class id match, this is a
// proper target for the given name and arguments descriptor. If the
// illegal class id was found, the target is a cache miss handler that can
// be invoked as a normal Dart function.
__ movl(EAX, FieldAddress(EDI, ECX, TIMES_4, base + kWordSize));
__ popl(ECX); // Restore MegamorphicCache.
__ movl(EDX,
FieldAddress(ECX, MegamorphicCache::arguments_descriptor_offset()));
__ movl(EBX, FieldAddress(EAX, Function::entry_point_offset()));
}
// Called from megamorphic calls.
// EBX: receiver
// ECX: MegamorphicCache (preserved)
// Result:
// EBX: target entry point
// EDX: argument descriptor
void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
EmitMegamorphicLookup(assembler);
__ ret();
}
// Called from switchable IC calls.
// EBX: receiver
// ECX: ICData (preserved)
// Result:
// EBX: target entry point
// EDX: arguments descriptor
void StubCode::GenerateICLookupStub(Assembler* assembler) {
__ int3();
}
} // namespace dart
#endif // defined TARGET_ARCH_IA32
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