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sdk/runtime/vm/compiler/stub_code_compiler_x64.cc
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Liam Appelbe e4196ce8c6 [vm] Namespace constants like offsets and sizeofs to use runtime_api.h 
Second sub-CL of https://dart-review.googlesource.com/c/sdk/+/100644
The first was here https://dart-review.googlesource.com/c/sdk/+/103487

Now that offsets_extractor is checked in, and we have a big header full
of hard coded constants, the next step is to make sure everything is
using those constants. This is essentially everything in the original
CL, except the new simarm_x64 architecture.

Bug: https://github.com/dart-lang/sdk/issues/36839
Change-Id: I236e4f30aa1df6d92209891c983b792d1835b608
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/104286
Commit-Queue: Liam Appelbe <liama@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
2019-06-10 02:55:25 +00:00

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// Copyright (c) 2019, 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/compiler/runtime_api.h"
#include "vm/globals.h"
// For `AllocateObjectInstr::WillAllocateNewOrRemembered`
#include "vm/compiler/backend/il.h"
#define SHOULD_NOT_INCLUDE_RUNTIME
#include "vm/compiler/backend/locations.h"
#include "vm/compiler/stub_code_compiler.h"
#if defined(TARGET_ARCH_X64) && !defined(DART_PRECOMPILED_RUNTIME)
#include "vm/class_id.h"
#include "vm/code_entry_kind.h"
#include "vm/compiler/assembler/assembler.h"
#include "vm/constants.h"
#include "vm/instructions.h"
#include "vm/static_type_exactness_state.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, precompiled_mode);
namespace compiler {
// Ensures that [RAX] is a new object, if not it will be added to the remembered
// set via a leaf runtime call.
//
// WARNING: This might clobber all registers except for [RAX], [THR] and [FP].
// The caller should simply call LeaveStubFrame() and return.
static void EnsureIsNewOrRemembered(Assembler* assembler,
bool preserve_registers = true) {
// If the object is not remembered we call a leaf-runtime to add it to the
// remembered set.
Label done;
__ testq(RAX, Immediate(1 << target::ObjectAlignment::kNewObjectBitPosition));
__ BranchIf(NOT_ZERO, &done);
if (preserve_registers) {
__ EnterCallRuntimeFrame(0);
} else {
__ ReserveAlignedFrameSpace(0);
}
__ movq(CallingConventions::kArg1Reg, RAX);
__ movq(CallingConventions::kArg2Reg, THR);
__ CallRuntime(kAddAllocatedObjectToRememberedSetRuntimeEntry, 2);
if (preserve_registers) {
__ LeaveCallRuntimeFrame();
}
__ Bind(&done);
}
// Input parameters:
// RSP : points to return address.
// RSP + 8 : address of last argument in argument array.
// RSP + 8*R10 : address of first argument in argument array.
// RSP + 8*R10 + 8 : address of return value.
// RBX : address of the runtime function to call.
// R10 : number of arguments to the call.
// Must preserve callee saved registers R12 and R13.
void StubCodeCompiler::GenerateCallToRuntimeStub(Assembler* assembler) {
const intptr_t thread_offset = target::NativeArguments::thread_offset();
const intptr_t argc_tag_offset = target::NativeArguments::argc_tag_offset();
const intptr_t argv_offset = target::NativeArguments::argv_offset();
const intptr_t retval_offset = target::NativeArguments::retval_offset();
__ movq(CODE_REG,
Address(THR, target::Thread::call_to_runtime_stub_offset()));
__ EnterStubFrame();
// Save exit frame information to enable stack walking as we are about
// to transition to Dart VM C++ code.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()), RBP);
#if defined(DEBUG)
{
Label ok;
// Check that we are always entering from Dart code.
__ movq(RAX, Immediate(VMTag::kDartCompiledTagId));
__ cmpq(RAX, Assembler::VMTagAddress());
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing VM code.
__ movq(Assembler::VMTagAddress(), RBX);
// Reserve space for arguments and align frame before entering C++ world.
__ subq(RSP, Immediate(target::NativeArguments::StructSize()));
if (OS::ActivationFrameAlignment() > 1) {
__ andq(RSP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass target::NativeArguments structure by value and call runtime.
__ movq(Address(RSP, 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_.
__ movq(Address(RSP, argc_tag_offset),
R10); // Set argc in target::NativeArguments.
// Compute argv.
__ leaq(RAX,
Address(RBP, R10, TIMES_8,
target::frame_layout.param_end_from_fp * target::kWordSize));
__ movq(Address(RSP, argv_offset),
RAX); // Set argv in target::NativeArguments.
__ addq(RAX,
Immediate(1 * target::kWordSize)); // Retval is next to 1st argument.
__ movq(Address(RSP, retval_offset),
RAX); // Set retval in target::NativeArguments.
#if defined(_WIN64)
ASSERT(target::NativeArguments::StructSize() >
CallingConventions::kRegisterTransferLimit);
__ movq(CallingConventions::kArg1Reg, RSP);
#endif
__ CallCFunction(RBX);
// Mark that the thread is executing Dart code.
__ movq(Assembler::VMTagAddress(), Immediate(VMTag::kDartCompiledTagId));
// Reset exit frame information in Isolate structure.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()),
Immediate(0));
// Restore the global object pool after returning from runtime (old space is
// moving, so the GOP could have been relocated).
if (FLAG_precompiled_mode && FLAG_use_bare_instructions) {
__ movq(PP, Address(THR, target::Thread::global_object_pool_offset()));
}
__ LeaveStubFrame();
// The following return can jump to a lazy-deopt stub, which assumes RAX
// contains a return value and will save it in a GC-visible way. We therefore
// have to ensure RAX does not contain any garbage value left from the C
// function we called (which has return type "void").
// (See GenerateDeoptimizationSequence::saved_result_slot_from_fp.)
__ xorq(RAX, RAX);
__ ret();
}
void StubCodeCompiler::GenerateSharedStub(
Assembler* assembler,
bool save_fpu_registers,
const RuntimeEntry* target,
intptr_t self_code_stub_offset_from_thread,
bool allow_return) {
// We want the saved registers to appear like part of the caller's frame, so
// we push them before calling EnterStubFrame.
__ PushRegisters(kDartAvailableCpuRegs,
save_fpu_registers ? kAllFpuRegistersList : 0);
const intptr_t kSavedCpuRegisterSlots =
Utils::CountOneBitsWord(kDartAvailableCpuRegs);
const intptr_t kSavedFpuRegisterSlots =
save_fpu_registers
? kNumberOfFpuRegisters * kFpuRegisterSize / target::kWordSize
: 0;
const intptr_t kAllSavedRegistersSlots =
kSavedCpuRegisterSlots + kSavedFpuRegisterSlots;
// Copy down the return address so the stack layout is correct.
__ pushq(Address(RSP, kAllSavedRegistersSlots * target::kWordSize));
__ movq(CODE_REG, Address(THR, self_code_stub_offset_from_thread));
__ EnterStubFrame();
__ CallRuntime(*target, /*argument_count=*/0);
if (!allow_return) {
__ Breakpoint();
return;
}
__ LeaveStubFrame();
// Drop "official" return address -- we can just use the one stored above the
// saved registers.
__ Drop(1);
__ PopRegisters(kDartAvailableCpuRegs,
save_fpu_registers ? kAllFpuRegistersList : 0);
__ ret();
}
void StubCodeCompiler::GenerateEnterSafepointStub(Assembler* assembler) {
RegisterSet all_registers;
all_registers.AddAllGeneralRegisters();
__ PushRegisters(all_registers.cpu_registers(),
all_registers.fpu_registers());
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(0);
__ movq(RAX, Address(THR, kEnterSafepointRuntimeEntry.OffsetFromThread()));
__ CallCFunction(RAX);
__ LeaveFrame();
__ PopRegisters(all_registers.cpu_registers(), all_registers.fpu_registers());
__ ret();
}
void StubCodeCompiler::GenerateExitSafepointStub(Assembler* assembler) {
RegisterSet all_registers;
all_registers.AddAllGeneralRegisters();
__ PushRegisters(all_registers.cpu_registers(),
all_registers.fpu_registers());
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(0);
__ movq(RAX, Address(THR, kExitSafepointRuntimeEntry.OffsetFromThread()));
__ CallCFunction(RAX);
__ LeaveFrame();
__ PopRegisters(all_registers.cpu_registers(), all_registers.fpu_registers());
__ ret();
}
void StubCodeCompiler::GenerateVerifyCallbackStub(Assembler* assembler) {
// SP points to return address, which needs to be the second argument to
// VerifyCallbackIsolate.
__ movq(CallingConventions::kArg2Reg, Address(SPREG, 0));
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(0);
__ movq(RAX,
Address(THR, kVerifyCallbackIsolateRuntimeEntry.OffsetFromThread()));
__ CallCFunction(RAX);
__ LeaveFrame();
__ ret();
}
// RBX: The extracted method.
// RDX: The type_arguments_field_offset (or 0)
void StubCodeCompiler::GenerateBuildMethodExtractorStub(
Assembler* assembler,
const Object& closure_allocation_stub,
const Object& context_allocation_stub) {
const intptr_t kReceiverOffsetInWords =
compiler::target::frame_layout.param_end_from_fp + 1;
__ EnterStubFrame();
// Push type_arguments vector (or null)
Label no_type_args;
__ movq(RCX, Address(THR, target::Thread::object_null_offset()));
__ cmpq(RDX, Immediate(0));
__ j(EQUAL, &no_type_args, Assembler::kNearJump);
__ movq(RAX,
Address(RBP, compiler::target::kWordSize * kReceiverOffsetInWords));
__ movq(RCX, Address(RAX, RDX, TIMES_1, 0));
__ Bind(&no_type_args);
__ pushq(RCX);
// Push extracted method.
__ pushq(RBX);
// Allocate context.
{
Label done, slow_path;
__ TryAllocateArray(kContextCid, target::Context::InstanceSize(1),
&slow_path, Assembler::kFarJump,
RAX, // instance
RSI, // end address
RDI);
__ movq(RSI, Address(THR, target::Thread::object_null_offset()));
__ movq(FieldAddress(RAX, target::Context::parent_offset()), RSI);
__ movq(FieldAddress(RAX, target::Context::num_variables_offset()),
Immediate(1));
__ jmp(&done);
__ Bind(&slow_path);
__ LoadImmediate(/*num_vars=*/R10, Immediate(1));
__ LoadObject(CODE_REG, context_allocation_stub);
__ call(FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ Bind(&done);
}
// Store receiver in context
__ movq(RSI,
Address(RBP, compiler::target::kWordSize * kReceiverOffsetInWords));
__ StoreIntoObject(
RAX, FieldAddress(RAX, target::Context::variable_offset(0)), RSI);
// Push context.
__ pushq(RAX);
// Allocate closure.
__ LoadObject(CODE_REG, closure_allocation_stub);
__ call(FieldAddress(
CODE_REG, target::Code::entry_point_offset(CodeEntryKind::kUnchecked)));
// Populate closure object.
__ popq(RCX); // Pop context.
__ StoreIntoObject(RAX, FieldAddress(RAX, target::Closure::context_offset()),
RCX);
__ popq(RCX); // Pop extracted method.
__ StoreIntoObjectNoBarrier(
RAX, FieldAddress(RAX, target::Closure::function_offset()), RCX);
__ popq(RCX); // Pop type argument vector.
__ StoreIntoObjectNoBarrier(
RAX,
FieldAddress(RAX, target::Closure::instantiator_type_arguments_offset()),
RCX);
__ LoadObject(RCX, EmptyTypeArguments());
__ StoreIntoObjectNoBarrier(
RAX, FieldAddress(RAX, target::Closure::delayed_type_arguments_offset()),
RCX);
__ LeaveStubFrame();
__ Ret();
}
void StubCodeCompiler::GenerateNullErrorSharedWithoutFPURegsStub(
Assembler* assembler) {
GenerateSharedStub(
assembler, /*save_fpu_registers=*/false, &kNullErrorRuntimeEntry,
target::Thread::null_error_shared_without_fpu_regs_stub_offset(),
/*allow_return=*/false);
}
void StubCodeCompiler::GenerateNullErrorSharedWithFPURegsStub(
Assembler* assembler) {
GenerateSharedStub(
assembler, /*save_fpu_registers=*/true, &kNullErrorRuntimeEntry,
target::Thread::null_error_shared_with_fpu_regs_stub_offset(),
/*allow_return=*/false);
}
void StubCodeCompiler::GenerateStackOverflowSharedWithoutFPURegsStub(
Assembler* assembler) {
GenerateSharedStub(
assembler, /*save_fpu_registers=*/false, &kStackOverflowRuntimeEntry,
target::Thread::stack_overflow_shared_without_fpu_regs_stub_offset(),
/*allow_return=*/true);
}
void StubCodeCompiler::GenerateStackOverflowSharedWithFPURegsStub(
Assembler* assembler) {
GenerateSharedStub(
assembler, /*save_fpu_registers=*/true, &kStackOverflowRuntimeEntry,
target::Thread::stack_overflow_shared_with_fpu_regs_stub_offset(),
/*allow_return=*/true);
}
// Input parameters:
// RSP : points to return address.
// RDI : stop message (const char*).
// Must preserve all registers.
void StubCodeCompiler::GeneratePrintStopMessageStub(Assembler* assembler) {
__ EnterCallRuntimeFrame(0);
// Call the runtime leaf function. RDI already contains the parameter.
#if defined(_WIN64)
__ movq(CallingConventions::kArg1Reg, RDI);
#endif
__ CallRuntime(kPrintStopMessageRuntimeEntry, 1);
__ LeaveCallRuntimeFrame();
__ ret();
}
// Input parameters:
// RSP : points to return address.
// RSP + 8 : address of return value.
// RAX : address of first argument in argument array.
// RBX : address of the native function to call.
// R10 : argc_tag including number of arguments and function kind.
static void GenerateCallNativeWithWrapperStub(Assembler* assembler,
Address wrapper_address) {
const intptr_t native_args_struct_offset = 0;
const intptr_t thread_offset =
target::NativeArguments::thread_offset() + native_args_struct_offset;
const intptr_t argc_tag_offset =
target::NativeArguments::argc_tag_offset() + native_args_struct_offset;
const intptr_t argv_offset =
target::NativeArguments::argv_offset() + native_args_struct_offset;
const intptr_t retval_offset =
target::NativeArguments::retval_offset() + native_args_struct_offset;
__ EnterStubFrame();
// Save exit frame information to enable stack walking as we are about
// to transition to native code.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()), RBP);
#if defined(DEBUG)
{
Label ok;
// Check that we are always entering from Dart code.
__ movq(R8, Immediate(VMTag::kDartCompiledTagId));
__ cmpq(R8, Assembler::VMTagAddress());
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing native code.
__ movq(Assembler::VMTagAddress(), RBX);
// Reserve space for the native arguments structure passed on the stack (the
// outgoing pointer parameter to the native arguments structure is passed in
// RDI) and align frame before entering the C++ world.
__ subq(RSP, Immediate(target::NativeArguments::StructSize()));
if (OS::ActivationFrameAlignment() > 1) {
__ andq(RSP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass target::NativeArguments structure by value and call native function.
__ movq(Address(RSP, thread_offset), THR); // Set thread in NativeArgs.
__ movq(Address(RSP, argc_tag_offset),
R10); // Set argc in target::NativeArguments.
__ movq(Address(RSP, argv_offset),
RAX); // Set argv in target::NativeArguments.
__ leaq(RAX,
Address(RBP, 2 * target::kWordSize)); // Compute return value addr.
__ movq(Address(RSP, retval_offset),
RAX); // Set retval in target::NativeArguments.
// Pass the pointer to the target::NativeArguments.
__ movq(CallingConventions::kArg1Reg, RSP);
// Pass pointer to function entrypoint.
__ movq(CallingConventions::kArg2Reg, RBX);
__ movq(RAX, wrapper_address);
__ CallCFunction(RAX);
// Mark that the thread is executing Dart code.
__ movq(Assembler::VMTagAddress(), Immediate(VMTag::kDartCompiledTagId));
// Reset exit frame information in Isolate structure.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()),
Immediate(0));
// Restore the global object pool after returning from runtime (old space is
// moving, so the GOP could have been relocated).
if (FLAG_precompiled_mode && FLAG_use_bare_instructions) {
__ movq(PP, Address(THR, target::Thread::global_object_pool_offset()));
}
__ LeaveStubFrame();
__ ret();
}
void StubCodeCompiler::GenerateCallNoScopeNativeStub(Assembler* assembler) {
GenerateCallNativeWithWrapperStub(
assembler,
Address(THR,
target::Thread::no_scope_native_wrapper_entry_point_offset()));
}
void StubCodeCompiler::GenerateCallAutoScopeNativeStub(Assembler* assembler) {
GenerateCallNativeWithWrapperStub(
assembler,
Address(THR,
target::Thread::auto_scope_native_wrapper_entry_point_offset()));
}
// Input parameters:
// RSP : points to return address.
// RSP + 8 : address of return value.
// RAX : address of first argument in argument array.
// RBX : address of the native function to call.
// R10 : argc_tag including number of arguments and function kind.
void StubCodeCompiler::GenerateCallBootstrapNativeStub(Assembler* assembler) {
const intptr_t native_args_struct_offset = 0;
const intptr_t thread_offset =
target::NativeArguments::thread_offset() + native_args_struct_offset;
const intptr_t argc_tag_offset =
target::NativeArguments::argc_tag_offset() + native_args_struct_offset;
const intptr_t argv_offset =
target::NativeArguments::argv_offset() + native_args_struct_offset;
const intptr_t retval_offset =
target::NativeArguments::retval_offset() + native_args_struct_offset;
__ EnterStubFrame();
// Save exit frame information to enable stack walking as we are about
// to transition to native code.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()), RBP);
#if defined(DEBUG)
{
Label ok;
// Check that we are always entering from Dart code.
__ movq(R8, Immediate(VMTag::kDartCompiledTagId));
__ cmpq(R8, Assembler::VMTagAddress());
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing native code.
__ movq(Assembler::VMTagAddress(), RBX);
// Reserve space for the native arguments structure passed on the stack (the
// outgoing pointer parameter to the native arguments structure is passed in
// RDI) and align frame before entering the C++ world.
__ subq(RSP, Immediate(target::NativeArguments::StructSize()));
if (OS::ActivationFrameAlignment() > 1) {
__ andq(RSP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass target::NativeArguments structure by value and call native function.
__ movq(Address(RSP, thread_offset), THR); // Set thread in NativeArgs.
__ movq(Address(RSP, argc_tag_offset),
R10); // Set argc in target::NativeArguments.
__ movq(Address(RSP, argv_offset),
RAX); // Set argv in target::NativeArguments.
__ leaq(RAX,
Address(RBP, 2 * target::kWordSize)); // Compute return value addr.
__ movq(Address(RSP, retval_offset),
RAX); // Set retval in target::NativeArguments.
// Pass the pointer to the target::NativeArguments.
__ movq(CallingConventions::kArg1Reg, RSP);
__ CallCFunction(RBX);
// Mark that the thread is executing Dart code.
__ movq(Assembler::VMTagAddress(), Immediate(VMTag::kDartCompiledTagId));
// Reset exit frame information in Isolate structure.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()),
Immediate(0));
// Restore the global object pool after returning from runtime (old space is
// moving, so the GOP could have been relocated).
if (FLAG_precompiled_mode && FLAG_use_bare_instructions) {
__ movq(PP, Address(THR, target::Thread::global_object_pool_offset()));
}
__ LeaveStubFrame();
__ ret();
}
// Input parameters:
// R10: arguments descriptor array.
void StubCodeCompiler::GenerateCallStaticFunctionStub(Assembler* assembler) {
__ EnterStubFrame();
__ pushq(R10); // Preserve arguments descriptor array.
// Setup space on stack for return value.
__ pushq(Immediate(0));
__ CallRuntime(kPatchStaticCallRuntimeEntry, 0);
__ popq(CODE_REG); // Get Code object result.
__ popq(R10); // Restore arguments descriptor array.
// Remove the stub frame as we are about to jump to the dart function.
__ LeaveStubFrame();
__ movq(RBX, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ jmp(RBX);
}
// Called from a static call only when an invalid code has been entered
// (invalid because its function was optimized or deoptimized).
// R10: arguments descriptor array.
void StubCodeCompiler::GenerateFixCallersTargetStub(Assembler* assembler) {
// Load code pointer to this stub from the thread:
// The one that is passed in, is not correct - it points to the code object
// that needs to be replaced.
__ movq(CODE_REG,
Address(THR, target::Thread::fix_callers_target_code_offset()));
__ EnterStubFrame();
__ pushq(R10); // Preserve arguments descriptor array.
// Setup space on stack for return value.
__ pushq(Immediate(0));
__ CallRuntime(kFixCallersTargetRuntimeEntry, 0);
__ popq(CODE_REG); // Get Code object.
__ popq(R10); // Restore arguments descriptor array.
__ movq(RAX, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ LeaveStubFrame();
__ jmp(RAX);
__ int3();
}
// Called from object allocate instruction when the allocation stub has been
// disabled.
void StubCodeCompiler::GenerateFixAllocationStubTargetStub(
Assembler* assembler) {
// Load code pointer to this stub from the thread:
// The one that is passed in, is not correct - it points to the code object
// that needs to be replaced.
__ movq(CODE_REG,
Address(THR, target::Thread::fix_allocation_stub_code_offset()));
__ EnterStubFrame();
// Setup space on stack for return value.
__ pushq(Immediate(0));
__ CallRuntime(kFixAllocationStubTargetRuntimeEntry, 0);
__ popq(CODE_REG); // Get Code object.
__ movq(RAX, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ LeaveStubFrame();
__ jmp(RAX);
__ int3();
}
// Input parameters:
// R10: smi-tagged argument count, may be zero.
// RBP[target::frame_layout.param_end_from_fp + 1]: last argument.
static void PushArrayOfArguments(Assembler* assembler) {
__ LoadObject(R12, NullObject());
// Allocate array to store arguments of caller.
__ movq(RBX, R12); // Null element type for raw Array.
__ Call(StubCodeAllocateArray());
__ SmiUntag(R10);
// RAX: newly allocated array.
// R10: length of the array (was preserved by the stub).
__ pushq(RAX); // Array is in RAX and on top of stack.
__ leaq(R12,
Address(RBP, R10, TIMES_8,
target::frame_layout.param_end_from_fp * target::kWordSize));
__ leaq(RBX, FieldAddress(RAX, target::Array::data_offset()));
// R12: address of first argument on stack.
// RBX: address of first argument in array.
Label loop, loop_condition;
#if defined(DEBUG)
static const bool kJumpLength = Assembler::kFarJump;
#else
static const bool kJumpLength = Assembler::kNearJump;
#endif // DEBUG
__ jmp(&loop_condition, kJumpLength);
__ Bind(&loop);
__ movq(RDI, Address(R12, 0));
// Generational barrier is needed, array is not necessarily in new space.
__ StoreIntoObject(RAX, Address(RBX, 0), RDI);
__ addq(RBX, Immediate(target::kWordSize));
__ subq(R12, Immediate(target::kWordSize));
__ Bind(&loop_condition);
__ decq(R10);
__ j(POSITIVE, &loop, Assembler::kNearJump);
}
// Used by eager and lazy deoptimization. Preserve result in RAX 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, PP, kNoRegister) below:
// +------------------+
// | Saved PP | <- PP
// +------------------+
// | 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) {
// DeoptimizeCopyFrame expects a Dart frame, i.e. EnterDartFrame(0), but there
// is no need to set the correct PC marker or load PP, since they get patched.
__ EnterStubFrame();
// The code in this frame may not cause GC. kDeoptimizeCopyFrameRuntimeEntry
// and kDeoptimizeFillFrameRuntimeEntry are leaf runtime calls.
const intptr_t saved_result_slot_from_fp =
compiler::target::frame_layout.first_local_from_fp + 1 -
(kNumberOfCpuRegisters - RAX);
const intptr_t saved_exception_slot_from_fp =
compiler::target::frame_layout.first_local_from_fp + 1 -
(kNumberOfCpuRegisters - RAX);
const intptr_t saved_stacktrace_slot_from_fp =
compiler::target::frame_layout.first_local_from_fp + 1 -
(kNumberOfCpuRegisters - RDX);
// Result in RAX 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.
__ pushq(Address(RBP, 2 * target::kWordSize));
} else {
__ pushq(static_cast<Register>(i));
}
}
__ subq(RSP, 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(RSP, offset), xmm_reg);
offset += kFpuRegisterSize;
}
// Pass address of saved registers block.
__ movq(CallingConventions::kArg1Reg, RSP);
bool is_lazy =
(kind == kLazyDeoptFromReturn) || (kind == kLazyDeoptFromThrow);
__ movq(CallingConventions::kArg2Reg, Immediate(is_lazy ? 1 : 0));
__ ReserveAlignedFrameSpace(0); // Ensure stack is aligned before the call.
__ CallRuntime(kDeoptimizeCopyFrameRuntimeEntry, 2);
// Result (RAX) is stack-size (FP - SP) in bytes.
if (kind == kLazyDeoptFromReturn) {
// Restore result into RBX temporarily.
__ movq(RBX, Address(RBP, saved_result_slot_from_fp * target::kWordSize));
} else if (kind == kLazyDeoptFromThrow) {
// Restore result into RBX temporarily.
__ movq(RBX,
Address(RBP, saved_exception_slot_from_fp * target::kWordSize));
__ movq(RDX,
Address(RBP, saved_stacktrace_slot_from_fp * target::kWordSize));
}
// There is a Dart Frame on the stack. We must restore PP and leave frame.
__ RestoreCodePointer();
__ LeaveStubFrame();
__ popq(RCX); // Preserve return address.
__ movq(RSP, RBP); // Discard optimized frame.
__ subq(RSP, RAX); // Reserve space for deoptimized frame.
__ pushq(RCX); // Restore return address.
// DeoptimizeFillFrame expects a Dart frame, i.e. EnterDartFrame(0), but there
// is no need to set the correct PC marker or load PP, since they get patched.
__ EnterStubFrame();
if (kind == kLazyDeoptFromReturn) {
__ pushq(RBX); // Preserve result as first local.
} else if (kind == kLazyDeoptFromThrow) {
__ pushq(RBX); // Preserve exception as first local.
__ pushq(RDX); // Preserve stacktrace as second local.
}
__ ReserveAlignedFrameSpace(0);
// Pass last FP as a parameter.
__ movq(CallingConventions::kArg1Reg, RBP);
__ CallRuntime(kDeoptimizeFillFrameRuntimeEntry, 1);
if (kind == kLazyDeoptFromReturn) {
// Restore result into RBX.
__ movq(RBX,
Address(RBP, compiler::target::frame_layout.first_local_from_fp *
target::kWordSize));
} else if (kind == kLazyDeoptFromThrow) {
// Restore exception into RBX.
__ movq(RBX,
Address(RBP, compiler::target::frame_layout.first_local_from_fp *
target::kWordSize));
// Restore stacktrace into RDX.
__ movq(
RDX,
Address(RBP, (compiler::target::frame_layout.first_local_from_fp - 1) *
target::kWordSize));
}
// Code above cannot cause GC.
// There is a Dart Frame on the stack. We must restore PP and leave frame.
__ RestoreCodePointer();
__ LeaveStubFrame();
// 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.
// Enter stub frame with loading PP. The caller's PP is not materialized yet.
__ EnterStubFrame();
if (kind == kLazyDeoptFromReturn) {
__ pushq(RBX); // Preserve result, it will be GC-d here.
} else if (kind == kLazyDeoptFromThrow) {
__ pushq(RBX); // Preserve exception.
__ pushq(RDX); // Preserve stacktrace.
}
__ pushq(Immediate(target::ToRawSmi(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.
__ popq(RBX);
__ SmiUntag(RBX);
if (kind == kLazyDeoptFromReturn) {
__ popq(RAX); // Restore result.
} else if (kind == kLazyDeoptFromThrow) {
__ popq(RDX); // Restore stacktrace.
__ popq(RAX); // Restore exception.
}
__ LeaveStubFrame();
__ popq(RCX); // Pop return address.
__ addq(RSP, RBX); // Remove materialization arguments.
__ pushq(RCX); // Push return address.
// The caller is responsible for emitting the return instruction.
}
// RAX: result, must be preserved
void StubCodeCompiler::GenerateDeoptimizeLazyFromReturnStub(
Assembler* assembler) {
// Push zap value instead of CODE_REG for lazy deopt.
__ pushq(Immediate(kZapCodeReg));
// Return address for "call" to deopt stub.
__ pushq(Immediate(kZapReturnAddress));
__ movq(CODE_REG,
Address(THR, target::Thread::lazy_deopt_from_return_stub_offset()));
GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn);
__ ret();
}
// RAX: exception, must be preserved
// RDX: stacktrace, must be preserved
void StubCodeCompiler::GenerateDeoptimizeLazyFromThrowStub(
Assembler* assembler) {
// Push zap value instead of CODE_REG for lazy deopt.
__ pushq(Immediate(kZapCodeReg));
// Return address for "call" to deopt stub.
__ pushq(Immediate(kZapReturnAddress));
__ movq(CODE_REG,
Address(THR, target::Thread::lazy_deopt_from_throw_stub_offset()));
GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow);
__ ret();
}
void StubCodeCompiler::GenerateDeoptimizeStub(Assembler* assembler) {
__ popq(TMP);
__ pushq(CODE_REG);
__ pushq(TMP);
__ movq(CODE_REG, Address(THR, target::Thread::deoptimize_stub_offset()));
GenerateDeoptimizationSequence(assembler, kEagerDeopt);
__ ret();
}
static void GenerateDispatcherCode(Assembler* assembler,
Label* call_target_function) {
__ Comment("NoSuchMethodDispatch");
// When lazily generated invocation dispatchers are disabled, the
// miss-handler may return null.
__ CompareObject(RAX, NullObject());
__ j(NOT_EQUAL, call_target_function);
__ EnterStubFrame();
// Load the receiver.
__ movq(RDI, FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ movq(RAX,
Address(RBP, RDI, TIMES_HALF_WORD_SIZE,
target::frame_layout.param_end_from_fp * target::kWordSize));
__ pushq(Immediate(0)); // Setup space on stack for result.
__ pushq(RAX); // Receiver.
__ pushq(RBX); // ICData/MegamorphicCache.
__ pushq(R10); // Arguments descriptor array.
// Adjust arguments count.
__ cmpq(
FieldAddress(R10, target::ArgumentsDescriptor::type_args_len_offset()),
Immediate(0));
__ movq(R10, RDI);
Label args_count_ok;
__ j(EQUAL, &args_count_ok, Assembler::kNearJump);
__ addq(R10, Immediate(target::ToRawSmi(1))); // Include the type arguments.
__ Bind(&args_count_ok);
// R10: Smi-tagged arguments array length.
PushArrayOfArguments(assembler);
const intptr_t kNumArgs = 4;
__ CallRuntime(kNoSuchMethodFromCallStubRuntimeEntry, kNumArgs);
__ Drop(4);
__ popq(RAX); // Return value.
__ LeaveStubFrame();
__ ret();
}
void StubCodeCompiler::GenerateMegamorphicMissStub(Assembler* assembler) {
__ EnterStubFrame();
// Load the receiver into RAX. The argument count in the arguments
// descriptor in R10 is a smi.
__ movq(RAX, FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
// Three words (saved pp, saved fp, stub's pc marker)
// in the stack above the return address.
__ movq(RAX, Address(RSP, RAX, TIMES_4,
compiler::target::frame_layout.saved_below_pc() *
target::kWordSize));
// Preserve IC data and arguments descriptor.
__ pushq(RBX);
__ pushq(R10);
// Space for the result of the runtime call.
__ pushq(Immediate(0));
__ pushq(RDX); // Receiver.
__ pushq(RBX); // IC data.
__ pushq(R10); // Arguments descriptor.
__ CallRuntime(kMegamorphicCacheMissHandlerRuntimeEntry, 3);
// Discard arguments.
__ popq(RAX);
__ popq(RAX);
__ popq(RAX);
__ popq(RAX); // Return value from the runtime call (function).
__ popq(R10); // Restore arguments descriptor.
__ popq(RBX); // Restore IC data.
__ RestoreCodePointer();
__ LeaveStubFrame();
if (!FLAG_lazy_dispatchers) {
Label call_target_function;
GenerateDispatcherCode(assembler, &call_target_function);
__ Bind(&call_target_function);
}
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ movq(RCX, FieldAddress(RAX, target::Function::entry_point_offset()));
__ jmp(RCX);
}
// Called for inline allocation of arrays.
// Input parameters:
// R10 : Array length as Smi.
// RBX : array element type (either NULL or an instantiated type).
// NOTE: R10 cannot be clobbered here as the caller relies on it being saved.
// The newly allocated object is returned in RAX.
void StubCodeCompiler::GenerateAllocateArrayStub(Assembler* assembler) {
Label slow_case;
// Compute the size to be allocated, it is based on the array length
// and is computed as:
// RoundedAllocationSize(
// (array_length * target::kwordSize) + target::Array::header_size()).
__ movq(RDI, R10); // Array Length.
// Check that length is a positive Smi.
__ testq(RDI, Immediate(kSmiTagMask));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(NOT_ZERO, &slow_case);
}
__ cmpq(RDI, Immediate(0));
__ j(LESS, &slow_case);
// Check for maximum allowed length.
const Immediate& max_len =
Immediate(target::ToRawSmi(target::Array::kMaxNewSpaceElements));
__ cmpq(RDI, max_len);
__ j(GREATER, &slow_case);
// Check for allocation tracing.
NOT_IN_PRODUCT(
__ MaybeTraceAllocation(kArrayCid, &slow_case, Assembler::kFarJump));
const intptr_t fixed_size_plus_alignment_padding =
target::Array::header_size() + target::ObjectAlignment::kObjectAlignment -
1;
// RDI is a Smi.
__ leaq(RDI, Address(RDI, TIMES_4, fixed_size_plus_alignment_padding));
ASSERT(kSmiTagShift == 1);
__ andq(RDI, Immediate(-target::ObjectAlignment::kObjectAlignment));
const intptr_t cid = kArrayCid;
__ movq(RAX, Address(THR, target::Thread::top_offset()));
// RDI: allocation size.
__ movq(RCX, RAX);
__ addq(RCX, RDI);
__ j(CARRY, &slow_case);
// Check if the allocation fits into the remaining space.
// RAX: potential new object start.
// RCX: potential next object start.
// RDI: allocation size.
__ cmpq(RCX, Address(THR, target::Thread::end_offset()));
__ j(ABOVE_EQUAL, &slow_case);
// Successfully allocated the object(s), now update top to point to
// next object start and initialize the object.
__ movq(Address(THR, target::Thread::top_offset()), RCX);
__ addq(RAX, Immediate(kHeapObjectTag));
NOT_IN_PRODUCT(__ UpdateAllocationStatsWithSize(cid, RDI));
// Initialize the tags.
// RAX: new object start as a tagged pointer.
// RDI: allocation size.
{
Label size_tag_overflow, done;
__ cmpq(RDI, Immediate(target::RawObject::kSizeTagMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
__ shlq(RDI, Immediate(target::RawObject::kTagBitsSizeTagPos -
target::ObjectAlignment::kObjectAlignmentLog2));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&size_tag_overflow);
__ LoadImmediate(RDI, Immediate(0));
__ Bind(&done);
// Get the class index and insert it into the tags.
uint32_t tags = target::MakeTagWordForNewSpaceObject(cid, 0);
__ orq(RDI, Immediate(tags));
__ movq(FieldAddress(RAX, target::Array::tags_offset()), RDI); // Tags.
}
// RAX: new object start as a tagged pointer.
// Store the type argument field.
// No generational barrier needed, since we store into a new object.
__ StoreIntoObjectNoBarrier(
RAX, FieldAddress(RAX, target::Array::type_arguments_offset()), RBX);
// Set the length field.
__ StoreIntoObjectNoBarrier(
RAX, FieldAddress(RAX, target::Array::length_offset()), R10);
// Initialize all array elements to raw_null.
// RAX: new object start as a tagged pointer.
// RCX: new object end address.
// RDI: iterator which initially points to the start of the variable
// data area to be initialized.
__ LoadObject(R12, NullObject());
__ leaq(RDI, FieldAddress(RAX, target::Array::header_size()));
Label done;
Label init_loop;
__ Bind(&init_loop);
__ cmpq(RDI, RCX);
#if defined(DEBUG)
static const bool kJumpLength = Assembler::kFarJump;
#else
static const bool kJumpLength = Assembler::kNearJump;
#endif // DEBUG
__ j(ABOVE_EQUAL, &done, kJumpLength);
// No generational barrier needed, since we are storing null.
__ StoreIntoObjectNoBarrier(RAX, Address(RDI, 0), R12);
__ addq(RDI, Immediate(target::kWordSize));
__ jmp(&init_loop, kJumpLength);
__ Bind(&done);
__ ret(); // returns the newly allocated object in RAX.
// 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();
// Setup space on stack for return value.
__ pushq(Immediate(0));
__ pushq(R10); // Array length as Smi.
__ pushq(RBX); // Element type.
__ CallRuntime(kAllocateArrayRuntimeEntry, 2);
__ popq(RAX); // Pop element type argument.
__ popq(R10); // Pop array length argument.
__ popq(RAX); // Pop return value from return slot.
// Write-barrier elimination might be enabled for this array (depending on the
// array length). To be sure we will check if the allocated object is in old
// space and if so call a leaf runtime to add it to the remembered set.
EnsureIsNewOrRemembered(assembler);
__ LeaveStubFrame();
__ ret();
}
// Called when invoking Dart code from C++ (VM code).
// Input parameters:
// RSP : points to return address.
// RDI : target code
// RSI : arguments descriptor array.
// RDX : arguments array.
// RCX : current thread.
void StubCodeCompiler::GenerateInvokeDartCodeStub(Assembler* assembler) {
__ pushq(Address(RSP, 0)); // Marker for the profiler.
__ EnterFrame(0);
const Register kTargetCodeReg = CallingConventions::kArg1Reg;
const Register kArgDescReg = CallingConventions::kArg2Reg;
const Register kArgsReg = CallingConventions::kArg3Reg;
const Register kThreadReg = CallingConventions::kArg4Reg;
// Push code object to PC marker slot.
__ pushq(Address(kThreadReg, target::Thread::invoke_dart_code_stub_offset()));
// At this point, the stack looks like:
// | stub code object
// | saved RBP | <-- RBP
// | saved PC (return to DartEntry::InvokeFunction) |
const intptr_t kInitialOffset = 2;
// Save arguments descriptor array, later replaced by Smi argument count.
const intptr_t kArgumentsDescOffset = -(kInitialOffset)*target::kWordSize;
__ pushq(kArgDescReg);
// Save C++ ABI callee-saved registers.
__ PushRegisters(CallingConventions::kCalleeSaveCpuRegisters,
CallingConventions::kCalleeSaveXmmRegisters);
// If any additional (or fewer) values are pushed, the offsets in
// target::frame_layout.exit_link_slot_from_entry_fp will need to be changed.
// Set up THR, which caches the current thread in Dart code.
if (THR != kThreadReg) {
__ movq(THR, kThreadReg);
}
// Save the current VMTag on the stack.
__ movq(RAX, Assembler::VMTagAddress());
__ pushq(RAX);
// Save top resource and top exit frame info. Use RAX as a temporary register.
// StackFrameIterator reads the top exit frame info saved in this frame.
__ movq(RAX, Address(THR, target::Thread::top_resource_offset()));
__ pushq(RAX);
__ movq(Address(THR, target::Thread::top_resource_offset()), Immediate(0));
__ movq(RAX, Address(THR, target::Thread::top_exit_frame_info_offset()));
__ pushq(RAX);
// The constant target::frame_layout.exit_link_slot_from_entry_fp must be kept
// in sync with the code above.
__ EmitEntryFrameVerification();
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()),
Immediate(0));
// Mark that the thread is executing Dart code. Do this after initializing the
// exit link for the profiler.
__ movq(Assembler::VMTagAddress(), Immediate(VMTag::kDartCompiledTagId));
// Load arguments descriptor array into R10, which is passed to Dart code.
__ movq(R10, Address(kArgDescReg, VMHandles::kOffsetOfRawPtrInHandle));
// Push arguments. At this point we only need to preserve kTargetCodeReg.
ASSERT(kTargetCodeReg != RDX);
// Load number of arguments into RBX and adjust count for type arguments.
__ movq(RBX, FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ cmpq(
FieldAddress(R10, target::ArgumentsDescriptor::type_args_len_offset()),
Immediate(0));
Label args_count_ok;
__ j(EQUAL, &args_count_ok, Assembler::kNearJump);
__ addq(RBX, Immediate(target::ToRawSmi(1))); // Include the type arguments.
__ Bind(&args_count_ok);
// Save number of arguments as Smi on stack, replacing saved ArgumentsDesc.
__ movq(Address(RBP, kArgumentsDescOffset), RBX);
__ SmiUntag(RBX);
// Compute address of 'arguments array' data area into RDX.
__ movq(RDX, Address(kArgsReg, VMHandles::kOffsetOfRawPtrInHandle));
__ leaq(RDX, FieldAddress(RDX, target::Array::data_offset()));
// Set up arguments for the Dart call.
Label push_arguments;
Label done_push_arguments;
__ j(ZERO, &done_push_arguments, Assembler::kNearJump);
__ LoadImmediate(RAX, Immediate(0));
__ Bind(&push_arguments);
__ pushq(Address(RDX, RAX, TIMES_8, 0));
__ incq(RAX);
__ cmpq(RAX, RBX);
__ j(LESS, &push_arguments, Assembler::kNearJump);
__ Bind(&done_push_arguments);
// Call the Dart code entrypoint.
if (FLAG_precompiled_mode && FLAG_use_bare_instructions) {
__ movq(PP, Address(THR, target::Thread::global_object_pool_offset()));
} else {
__ xorq(PP, PP); // GC-safe value into PP.
}
__ movq(CODE_REG,
Address(kTargetCodeReg, VMHandles::kOffsetOfRawPtrInHandle));
__ movq(kTargetCodeReg,
FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ call(kTargetCodeReg); // R10 is the arguments descriptor array.
// Read the saved number of passed arguments as Smi.
__ movq(RDX, Address(RBP, kArgumentsDescOffset));
// Get rid of arguments pushed on the stack.
__ leaq(RSP, Address(RSP, RDX, TIMES_4, 0)); // RDX is a Smi.
// Restore the saved top exit frame info and top resource back into the
// Isolate structure.
__ popq(Address(THR, target::Thread::top_exit_frame_info_offset()));
__ popq(Address(THR, target::Thread::top_resource_offset()));
// Restore the current VMTag from the stack.
__ popq(Assembler::VMTagAddress());
// Restore C++ ABI callee-saved registers.
__ PopRegisters(CallingConventions::kCalleeSaveCpuRegisters,
CallingConventions::kCalleeSaveXmmRegisters);
__ set_constant_pool_allowed(false);
// Restore the frame pointer.
__ LeaveFrame();
__ popq(RCX);
__ ret();
}
// Called when invoking compiled Dart code from interpreted Dart code.
// Input parameters:
// RSP : points to return address.
// RDI : target raw code
// RSI : arguments raw descriptor array.
// RDX : address of first argument.
// RCX : current thread.
void StubCodeCompiler::GenerateInvokeDartCodeFromBytecodeStub(
Assembler* assembler) {
#if defined(DART_PRECOMPILED_RUNTIME)
__ Stop("Not using interpreter");
#else
__ pushq(Address(RSP, 0)); // Marker for the profiler.
__ EnterFrame(0);
const Register kTargetCodeReg = CallingConventions::kArg1Reg;
const Register kArgDescReg = CallingConventions::kArg2Reg;
const Register kArg0Reg = CallingConventions::kArg3Reg;
const Register kThreadReg = CallingConventions::kArg4Reg;
// Push code object to PC marker slot.
__ pushq(
Address(kThreadReg,
target::Thread::invoke_dart_code_from_bytecode_stub_offset()));
// At this point, the stack looks like:
// | stub code object
// | saved RBP | <-- RBP
// | saved PC (return to interpreter's InvokeCompiled) |
const intptr_t kInitialOffset = 2;
// Save arguments descriptor array, later replaced by Smi argument count.
const intptr_t kArgumentsDescOffset = -(kInitialOffset)*target::kWordSize;
__ pushq(kArgDescReg);
// Save C++ ABI callee-saved registers.
__ PushRegisters(CallingConventions::kCalleeSaveCpuRegisters,
CallingConventions::kCalleeSaveXmmRegisters);
// If any additional (or fewer) values are pushed, the offsets in
// target::frame_layout.exit_link_slot_from_entry_fp will need to be changed.
// Set up THR, which caches the current thread in Dart code.
if (THR != kThreadReg) {
__ movq(THR, kThreadReg);
}
// Save the current VMTag on the stack.
__ movq(RAX, Assembler::VMTagAddress());
__ pushq(RAX);
// Save top resource and top exit frame info. Use RAX as a temporary register.
// StackFrameIterator reads the top exit frame info saved in this frame.
__ movq(RAX, Address(THR, target::Thread::top_resource_offset()));
__ pushq(RAX);
__ movq(Address(THR, target::Thread::top_resource_offset()), Immediate(0));
__ movq(RAX, Address(THR, target::Thread::top_exit_frame_info_offset()));
__ pushq(RAX);
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()),
Immediate(0));
// The constant target::frame_layout.exit_link_slot_from_entry_fp must be kept
// in sync with the code below.
#if defined(DEBUG)
{
Label ok;
__ leaq(RAX,
Address(RBP, target::frame_layout.exit_link_slot_from_entry_fp *
target::kWordSize));
__ cmpq(RAX, RSP);
__ j(EQUAL, &ok);
__ Stop("target::frame_layout.exit_link_slot_from_entry_fp mismatch");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing Dart code. Do this after initializing the
// exit link for the profiler.
__ movq(Assembler::VMTagAddress(), Immediate(VMTag::kDartCompiledTagId));
// Load arguments descriptor array into R10, which is passed to Dart code.
__ movq(R10, kArgDescReg);
// Push arguments. At this point we only need to preserve kTargetCodeReg.
ASSERT(kTargetCodeReg != RDX);
// Load number of arguments into RBX and adjust count for type arguments.
__ movq(RBX, FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ cmpq(
FieldAddress(R10, target::ArgumentsDescriptor::type_args_len_offset()),
Immediate(0));
Label args_count_ok;
__ j(EQUAL, &args_count_ok, Assembler::kNearJump);
__ addq(RBX, Immediate(target::ToRawSmi(1))); // Include the type arguments.
__ Bind(&args_count_ok);
// Save number of arguments as Smi on stack, replacing saved ArgumentsDesc.
__ movq(Address(RBP, kArgumentsDescOffset), RBX);
__ SmiUntag(RBX);
// Compute address of first argument into RDX.
if (kArg0Reg != RDX) { // Different registers on WIN64.
__ movq(RDX, kArg0Reg);
}
// Set up arguments for the Dart call.
Label push_arguments;
Label done_push_arguments;
__ j(ZERO, &done_push_arguments, Assembler::kNearJump);
__ LoadImmediate(RAX, Immediate(0));
__ Bind(&push_arguments);
__ pushq(Address(RDX, RAX, TIMES_8, 0));
__ incq(RAX);
__ cmpq(RAX, RBX);
__ j(LESS, &push_arguments, Assembler::kNearJump);
__ Bind(&done_push_arguments);
// Call the Dart code entrypoint.
__ xorq(PP, PP); // GC-safe value into PP.
__ movq(CODE_REG, kTargetCodeReg);
__ movq(kTargetCodeReg,
FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ call(kTargetCodeReg); // R10 is the arguments descriptor array.
// Read the saved number of passed arguments as Smi.
__ movq(RDX, Address(RBP, kArgumentsDescOffset));
// Get rid of arguments pushed on the stack.
__ leaq(RSP, Address(RSP, RDX, TIMES_4, 0)); // RDX is a Smi.
// Restore the saved top exit frame info and top resource back into the
// Isolate structure.
__ popq(Address(THR, target::Thread::top_exit_frame_info_offset()));
__ popq(Address(THR, target::Thread::top_resource_offset()));
// Restore the current VMTag from the stack.
__ popq(Assembler::VMTagAddress());
// Restore C++ ABI callee-saved registers.
__ PopRegisters(CallingConventions::kCalleeSaveCpuRegisters,
CallingConventions::kCalleeSaveXmmRegisters);
__ set_constant_pool_allowed(false);
// Restore the frame pointer.
__ LeaveFrame();
__ popq(RCX);
__ ret();
#endif // defined(DART_PRECOMPILED_RUNTIME)
}
// Called for inline allocation of contexts.
// Input:
// R10: number of context variables.
// Output:
// RAX: new allocated RawContext object.
void StubCodeCompiler::GenerateAllocateContextStub(Assembler* assembler) {
__ LoadObject(R9, NullObject());
if (FLAG_inline_alloc) {
Label slow_case;
// First compute the rounded instance size.
// R10: number of context variables.
intptr_t fixed_size_plus_alignment_padding =
(target::Context::header_size() +
target::ObjectAlignment::kObjectAlignment - 1);
__ leaq(R13, Address(R10, TIMES_8, fixed_size_plus_alignment_padding));
__ andq(R13, Immediate(-target::ObjectAlignment::kObjectAlignment));
// Check for allocation tracing.
NOT_IN_PRODUCT(
__ MaybeTraceAllocation(kContextCid, &slow_case, Assembler::kFarJump));
// Now allocate the object.
// R10: number of context variables.
const intptr_t cid = kContextCid;
__ movq(RAX, Address(THR, target::Thread::top_offset()));
__ addq(R13, RAX);
// Check if the allocation fits into the remaining space.
// RAX: potential new object.
// R13: potential next object start.
// R10: number of context variables.
__ cmpq(R13, Address(THR, target::Thread::end_offset()));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(ABOVE_EQUAL, &slow_case);
}
// Successfully allocated the object, now update top to point to
// next object start and initialize the object.
// RAX: new object.
// R13: next object start.
// R10: number of context variables.
__ movq(Address(THR, target::Thread::top_offset()), R13);
// R13: Size of allocation in bytes.
__ subq(R13, RAX);
__ addq(RAX, Immediate(kHeapObjectTag));
// Generate isolate-independent code to allow sharing between isolates.
NOT_IN_PRODUCT(__ UpdateAllocationStatsWithSize(cid, R13));
// Calculate the size tag.
// RAX: new object.
// R10: number of context variables.
{
Label size_tag_overflow, done;
__ leaq(R13, Address(R10, TIMES_8, fixed_size_plus_alignment_padding));
__ andq(R13, Immediate(-target::ObjectAlignment::kObjectAlignment));
__ cmpq(R13, Immediate(target::RawObject::kSizeTagMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
__ shlq(R13, Immediate(target::RawObject::kTagBitsSizeTagPos -
target::ObjectAlignment::kObjectAlignmentLog2));
__ jmp(&done);
__ Bind(&size_tag_overflow);
// Set overflow size tag value.
__ LoadImmediate(R13, Immediate(0));
__ Bind(&done);
// RAX: new object.
// R10: number of context variables.
// R13: size and bit tags.
uint32_t tags = target::MakeTagWordForNewSpaceObject(cid, 0);
__ orq(R13, Immediate(tags));
__ movq(FieldAddress(RAX, target::Object::tags_offset()), R13); // Tags.
}
// Setup up number of context variables field.
// RAX: new object.
// R10: number of context variables as integer value (not object).
__ movq(FieldAddress(RAX, target::Context::num_variables_offset()), R10);
// Setup the parent field.
// RAX: new object.
// R10: number of context variables.
// No generational barrier needed, since we are storing null.
__ StoreIntoObjectNoBarrier(
RAX, FieldAddress(RAX, target::Context::parent_offset()), R9);
// Initialize the context variables.
// RAX: new object.
// R10: number of context variables.
{
Label loop, entry;
__ leaq(R13, FieldAddress(RAX, target::Context::variable_offset(0)));
#if defined(DEBUG)
static const bool kJumpLength = Assembler::kFarJump;
#else
static const bool kJumpLength = Assembler::kNearJump;
#endif // DEBUG
__ jmp(&entry, kJumpLength);
__ Bind(&loop);
__ decq(R10);
// No generational barrier needed, since we are storing null.
__ StoreIntoObjectNoBarrier(RAX, Address(R13, R10, TIMES_8, 0), R9);
__ Bind(&entry);
__ cmpq(R10, Immediate(0));
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
}
// Done allocating and initializing the context.
// RAX: new object.
__ ret();
__ Bind(&slow_case);
}
// Create a stub frame.
__ EnterStubFrame();
__ pushq(R9); // Setup space on stack for the return value.
__ SmiTag(R10);
__ pushq(R10); // Push number of context variables.
__ CallRuntime(kAllocateContextRuntimeEntry, 1); // Allocate context.
__ popq(RAX); // Pop number of context variables argument.
__ popq(RAX); // Pop the new context object.
// Write-barrier elimination might be enabled for this context (depending on
// the size). To be sure we will check if the allocated object is in old
// space and if so call a leaf runtime to add it to the remembered set.
EnsureIsNewOrRemembered(assembler, /*preserve_registers=*/false);
// RAX: new object
// Restore the frame pointer.
__ LeaveStubFrame();
__ ret();
}
void StubCodeCompiler::GenerateWriteBarrierWrappersStub(Assembler* assembler) {
for (intptr_t i = 0; i < kNumberOfCpuRegisters; ++i) {
if ((kDartAvailableCpuRegs & (1 << i)) == 0) continue;
Register reg = static_cast<Register>(i);
intptr_t start = __ CodeSize();
__ pushq(kWriteBarrierObjectReg);
__ movq(kWriteBarrierObjectReg, reg);
__ call(Address(THR, target::Thread::write_barrier_entry_point_offset()));
__ popq(kWriteBarrierObjectReg);
__ ret();
intptr_t end = __ CodeSize();
RELEASE_ASSERT(end - start == kStoreBufferWrapperSize);
}
}
// Helper stub to implement Assembler::StoreIntoObject/Array.
// Input parameters:
// RDX: Object (old)
// RAX: Value (old or new)
// R13: Slot
// If RAX is new, add RDX to the store buffer. Otherwise RAX is old, mark RAX
// and add it to the mark list.
COMPILE_ASSERT(kWriteBarrierObjectReg == RDX);
COMPILE_ASSERT(kWriteBarrierValueReg == RAX);
COMPILE_ASSERT(kWriteBarrierSlotReg == R13);
static void GenerateWriteBarrierStubHelper(Assembler* assembler,
Address stub_code,
bool cards) {
Label add_to_mark_stack, remember_card;
__ testq(RAX, Immediate(1 << target::ObjectAlignment::kNewObjectBitPosition));
__ j(ZERO, &add_to_mark_stack);
if (cards) {
__ movl(TMP, FieldAddress(RDX, target::Object::tags_offset()));
__ testl(TMP, Immediate(1 << target::RawObject::kCardRememberedBit));
__ j(NOT_ZERO, &remember_card, Assembler::kFarJump);
} else {
#if defined(DEBUG)
Label ok;
__ movl(TMP, FieldAddress(RDX, target::Object::tags_offset()));
__ testl(TMP, Immediate(1 << target::RawObject::kCardRememberedBit));
__ j(ZERO, &ok, Assembler::kFarJump);
__ Stop("Wrong barrier");
__ Bind(&ok);
#endif
}
// Update the tags that this object has been remembered.
// Note that we use 32 bit operations here to match the size of the
// background sweeper which is also manipulating this 32 bit word.
// RDX: Address being stored
// RAX: Current tag value
// lock+andl is an atomic read-modify-write.
__ lock();
__ andl(FieldAddress(RDX, target::Object::tags_offset()),
Immediate(~(1 << target::RawObject::kOldAndNotRememberedBit)));
// Save registers being destroyed.
__ pushq(RAX);
__ pushq(RCX);
// Load the StoreBuffer block out of the thread. Then load top_ out of the
// StoreBufferBlock and add the address to the pointers_.
// RDX: Address being stored
__ movq(RAX, Address(THR, target::Thread::store_buffer_block_offset()));
__ movl(RCX, Address(RAX, target::StoreBufferBlock::top_offset()));
__ movq(
Address(RAX, RCX, TIMES_8, target::StoreBufferBlock::pointers_offset()),
RDX);
// Increment top_ and check for overflow.
// RCX: top_
// RAX: StoreBufferBlock
Label overflow;
__ incq(RCX);
__ movl(Address(RAX, target::StoreBufferBlock::top_offset()), RCX);
__ cmpl(RCX, Immediate(target::StoreBufferBlock::kSize));
// Restore values.
__ popq(RCX);
__ popq(RAX);
__ j(EQUAL, &overflow, Assembler::kNearJump);
__ ret();
// Handle overflow: Call the runtime leaf function.
__ Bind(&overflow);
// Setup frame, push callee-saved registers.
__ pushq(CODE_REG);
__ movq(CODE_REG, stub_code);
__ EnterCallRuntimeFrame(0);
__ movq(CallingConventions::kArg1Reg, THR);
__ CallRuntime(kStoreBufferBlockProcessRuntimeEntry, 1);
__ LeaveCallRuntimeFrame();
__ popq(CODE_REG);
__ ret();
__ Bind(&add_to_mark_stack);
__ pushq(RAX); // Spill.
__ pushq(RCX); // Spill.
__ movq(TMP, RAX); // RAX is fixed implicit operand of CAS.
// Atomically clear kOldAndNotMarkedBit.
// Note that we use 32 bit operations here to match the size of the
// background marker which is also manipulating this 32 bit word.
Label retry, lost_race, marking_overflow;
__ movl(RAX, FieldAddress(TMP, target::Object::tags_offset()));
__ Bind(&retry);
__ movl(RCX, RAX);
__ testl(RCX, Immediate(1 << target::RawObject::kOldAndNotMarkedBit));
__ j(ZERO, &lost_race); // Marked by another thread.
__ andl(RCX, Immediate(~(1 << target::RawObject::kOldAndNotMarkedBit)));
__ LockCmpxchgl(FieldAddress(TMP, target::Object::tags_offset()), RCX);
__ j(NOT_EQUAL, &retry, Assembler::kNearJump);
__ movq(RAX, Address(THR, target::Thread::marking_stack_block_offset()));
__ movl(RCX, Address(RAX, target::MarkingStackBlock::top_offset()));
__ movq(
Address(RAX, RCX, TIMES_8, target::MarkingStackBlock::pointers_offset()),
TMP);
__ incq(RCX);
__ movl(Address(RAX, target::MarkingStackBlock::top_offset()), RCX);
__ cmpl(RCX, Immediate(target::MarkingStackBlock::kSize));
__ popq(RCX); // Unspill.
__ popq(RAX); // Unspill.
__ j(EQUAL, &marking_overflow, Assembler::kNearJump);
__ ret();
__ Bind(&marking_overflow);
__ pushq(CODE_REG);
__ movq(CODE_REG, stub_code);
__ EnterCallRuntimeFrame(0);
__ movq(CallingConventions::kArg1Reg, THR);
__ CallRuntime(kMarkingStackBlockProcessRuntimeEntry, 1);
__ LeaveCallRuntimeFrame();
__ popq(CODE_REG);
__ ret();
__ Bind(&lost_race);
__ popq(RCX); // Unspill.
__ popq(RAX); // Unspill.
__ ret();
if (cards) {
Label remember_card_slow;
// Get card table.
__ Bind(&remember_card);
__ movq(TMP, RDX); // Object.
__ andq(TMP, Immediate(target::kPageMask)); // HeapPage.
__ cmpq(Address(TMP, target::HeapPage::card_table_offset()), Immediate(0));
__ j(EQUAL, &remember_card_slow, Assembler::kNearJump);
// Dirty the card.
__ subq(R13, TMP); // Offset in page.
__ movq(
TMP,
Address(TMP, target::HeapPage::card_table_offset())); // Card table.
__ shrq(R13,
Immediate(
target::HeapPage::kBytesPerCardLog2)); // Index in card table.
__ movb(Address(TMP, R13, TIMES_1, 0), Immediate(1));
__ ret();
// Card table not yet allocated.
__ Bind(&remember_card_slow);
__ pushq(CODE_REG);
__ movq(CODE_REG, stub_code);
__ EnterCallRuntimeFrame(0);
__ movq(CallingConventions::kArg1Reg, RDX);
__ movq(CallingConventions::kArg2Reg, R13);
__ CallRuntime(kRememberCardRuntimeEntry, 2);
__ LeaveCallRuntimeFrame();
__ popq(CODE_REG);
__ ret();
}
}
void StubCodeCompiler::GenerateWriteBarrierStub(Assembler* assembler) {
GenerateWriteBarrierStubHelper(
assembler, Address(THR, target::Thread::write_barrier_code_offset()),
false);
}
void StubCodeCompiler::GenerateArrayWriteBarrierStub(Assembler* assembler) {
GenerateWriteBarrierStubHelper(
assembler,
Address(THR, target::Thread::array_write_barrier_code_offset()), true);
}
// Called for inline allocation of objects.
// Input parameters:
// RSP + 8 : type arguments object (only if class is parameterized).
// RSP : points to return address.
void StubCodeCompiler::GenerateAllocationStubForClass(Assembler* assembler,
const Class& cls) {
const intptr_t kObjectTypeArgumentsOffset = 1 * target::kWordSize;
// The generated code is different if the class is parameterized.
const bool is_cls_parameterized = target::Class::NumTypeArguments(cls) > 0;
ASSERT(!is_cls_parameterized || target::Class::TypeArgumentsFieldOffset(
cls) != target::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 = target::Class::GetInstanceSize(cls);
ASSERT(instance_size > 0);
__ LoadObject(R9, NullObject());
if (is_cls_parameterized) {
__ movq(RDX, Address(RSP, kObjectTypeArgumentsOffset));
// RDX: instantiated type arguments.
}
if (FLAG_inline_alloc &&
target::Heap::IsAllocatableInNewSpace(instance_size) &&
!target::Class::TraceAllocation(cls)) {
Label slow_case;
// Allocate the object and update top to point to
// next object start and initialize the allocated object.
// RDX: instantiated type arguments (if is_cls_parameterized).
__ movq(RAX, Address(THR, target::Thread::top_offset()));
__ leaq(RBX, Address(RAX, instance_size));
// Check if the allocation fits into the remaining space.
// RAX: potential new object start.
// RBX: potential next object start.
__ cmpq(RBX, Address(THR, target::Thread::end_offset()));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(ABOVE_EQUAL, &slow_case);
}
__ movq(Address(THR, target::Thread::top_offset()), RBX);
NOT_IN_PRODUCT(__ UpdateAllocationStats(target::Class::GetId(cls)));
// RAX: new object start (untagged).
// RBX: next object start.
// RDX: new object type arguments (if is_cls_parameterized).
// Set the tags.
ASSERT(target::Class::GetId(cls) != kIllegalCid);
const uint32_t tags = target::MakeTagWordForNewSpaceObject(
target::Class::GetId(cls), instance_size);
// 64 bit store also zeros the identity hash field.
__ movq(Address(RAX, target::Object::tags_offset()), Immediate(tags));
__ addq(RAX, Immediate(kHeapObjectTag));
// Initialize the remaining words of the object.
// RAX: new object (tagged).
// RBX: next object start.
// RDX: new object type arguments (if is_cls_parameterized).
// R9: raw null.
// First try inlining the initialization without a loop.
if (instance_size < (kInlineInstanceSize * target::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 = target::Instance::first_field_offset();
current_offset < instance_size;
current_offset += target::kWordSize) {
__ StoreIntoObjectNoBarrier(RAX, FieldAddress(RAX, current_offset), R9);
}
} else {
__ leaq(RCX, FieldAddress(RAX, target::Instance::first_field_offset()));
// Loop until the whole object is initialized.
// RAX: new object (tagged).
// RBX: next object start.
// RCX: next word to be initialized.
// RDX: new object type arguments (if is_cls_parameterized).
Label init_loop;
Label done;
__ Bind(&init_loop);
__ cmpq(RCX, RBX);
#if defined(DEBUG)
static const bool kJumpLength = Assembler::kFarJump;
#else
static const bool kJumpLength = Assembler::kNearJump;
#endif // DEBUG
__ j(ABOVE_EQUAL, &done, kJumpLength);
__ StoreIntoObjectNoBarrier(RAX, Address(RCX, 0), R9);
__ addq(RCX, Immediate(target::kWordSize));
__ jmp(&init_loop, Assembler::kNearJump);
__ Bind(&done);
}
if (is_cls_parameterized) {
// RAX: new object (tagged).
// RDX: new object type arguments.
// Set the type arguments in the new object.
const intptr_t offset = target::Class::TypeArgumentsFieldOffset(cls);
__ StoreIntoObjectNoBarrier(RAX, FieldAddress(RAX, offset), RDX);
}
// Done allocating and initializing the instance.
// RAX: new object (tagged).
__ ret();
__ Bind(&slow_case);
}
// If is_cls_parameterized:
// RDX: new object type arguments.
// Create a stub frame.
__ EnterStubFrame(); // Uses PP to access class object.
__ pushq(R9); // Setup space on stack for return value.
__ PushObject(
CastHandle<Object>(cls)); // Push class of object to be allocated.
if (is_cls_parameterized) {
__ pushq(RDX); // Push type arguments of object to be allocated.
} else {
__ pushq(R9); // Push null type arguments.
}
__ CallRuntime(kAllocateObjectRuntimeEntry, 2); // Allocate object.
__ popq(RAX); // Pop argument (type arguments of object).
__ popq(RAX); // Pop argument (class of object).
__ popq(RAX); // Pop result (newly allocated object).
if (AllocateObjectInstr::WillAllocateNewOrRemembered(cls)) {
// Write-barrier elimination is enabled for [cls] and we therefore need to
// ensure that the object is in new-space or has remembered bit set.
EnsureIsNewOrRemembered(assembler, /*preserve_registers=*/false);
}
// RAX: new object
// Restore the frame pointer.
__ LeaveStubFrame();
__ 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:
// RSP : points to return address.
// RSP + 8 : address of last argument.
// R10 : arguments descriptor array.
void StubCodeCompiler::GenerateCallClosureNoSuchMethodStub(
Assembler* assembler) {
__ EnterStubFrame();
// Load the receiver.
__ movq(R13, FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ movq(RAX,
Address(RBP, R13, TIMES_4,
target::frame_layout.param_end_from_fp * target::kWordSize));
// Load the function.
__ movq(RBX, FieldAddress(RAX, target::Closure::function_offset()));
__ pushq(Immediate(0)); // Result slot.
__ pushq(RAX); // Receiver.
__ pushq(RBX); // Function.
__ pushq(R10); // Arguments descriptor array.
// Adjust arguments count.
__ cmpq(
FieldAddress(R10, target::ArgumentsDescriptor::type_args_len_offset()),
Immediate(0));
__ movq(R10, R13);
Label args_count_ok;
__ j(EQUAL, &args_count_ok, Assembler::kNearJump);
__ addq(R10, Immediate(target::ToRawSmi(1))); // Include the type arguments.
__ Bind(&args_count_ok);
// R10: Smi-tagged arguments array length.
PushArrayOfArguments(assembler);
const intptr_t kNumArgs = 4;
__ CallRuntime(kNoSuchMethodFromPrologueRuntimeEntry, 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 StubCodeCompiler::GenerateOptimizedUsageCounterIncrement(
Assembler* assembler) {
Register ic_reg = RBX;
Register func_reg = RDI;
if (FLAG_trace_optimized_ic_calls) {
__ EnterStubFrame();
__ pushq(func_reg); // Preserve
__ pushq(ic_reg); // Preserve.
__ pushq(ic_reg); // Argument.
__ pushq(func_reg); // Argument.
__ CallRuntime(kTraceICCallRuntimeEntry, 2);
__ popq(RAX); // Discard argument;
__ popq(RAX); // Discard argument;
__ popq(ic_reg); // Restore.
__ popq(func_reg); // Restore.
__ LeaveStubFrame();
}
__ incl(FieldAddress(func_reg, target::Function::usage_counter_offset()));
}
// Loads function into 'temp_reg', preserves 'ic_reg'.
void StubCodeCompiler::GenerateUsageCounterIncrement(Assembler* assembler,
Register temp_reg) {
if (FLAG_optimization_counter_threshold >= 0) {
Register ic_reg = RBX;
Register func_reg = temp_reg;
ASSERT(ic_reg != func_reg);
__ Comment("Increment function counter");
__ movq(func_reg, FieldAddress(ic_reg, target::ICData::owner_offset()));
__ incl(FieldAddress(func_reg, target::Function::usage_counter_offset()));
}
}
// Note: RBX 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);
__ movq(RAX, Address(RSP, +2 * target::kWordSize)); // Left.
__ movq(RCX, Address(RSP, +1 * target::kWordSize)); // Right
__ movq(R13, RCX);
__ orq(R13, RAX);
__ testq(R13, Immediate(kSmiTagMask));
__ j(NOT_ZERO, not_smi_or_overflow);
switch (kind) {
case Token::kADD: {
__ addq(RAX, RCX);
__ j(OVERFLOW, not_smi_or_overflow);
break;
}
case Token::kLT: {
__ cmpq(RAX, RCX);
__ setcc(GREATER_EQUAL, ByteRegisterOf(RAX));
__ movzxb(RAX, RAX); // RAX := RAX < RCX ? 0 : 1
__ movq(RAX,
Address(THR, RAX, TIMES_8, target::Thread::bool_true_offset()));
ASSERT(target::Thread::bool_true_offset() + 8 ==
target::Thread::bool_false_offset());
break;
}
case Token::kEQ: {
__ cmpq(RAX, RCX);
__ setcc(NOT_EQUAL, ByteRegisterOf(RAX));
__ movzxb(RAX, RAX); // RAX := RAX == RCX ? 0 : 1
__ movq(RAX,
Address(THR, RAX, TIMES_8, target::Thread::bool_true_offset()));
ASSERT(target::Thread::bool_true_offset() + 8 ==
target::Thread::bool_false_offset());
break;
}
default:
UNIMPLEMENTED();
}
// RBX: IC data object (preserved).
__ movq(R13, FieldAddress(RBX, target::ICData::entries_offset()));
// R13: ic_data_array with check entries: classes and target functions.
__ leaq(R13, FieldAddress(R13, target::Array::data_offset()));
// R13: points directly to the first ic data array element.
#if defined(DEBUG)
// Check that first entry is for Smi/Smi.
Label error, ok;
const Immediate& imm_smi_cid = Immediate(target::ToRawSmi(kSmiCid));
__ cmpq(Address(R13, 0 * target::kWordSize), imm_smi_cid);
__ j(NOT_EQUAL, &error, Assembler::kNearJump);
__ cmpq(Address(R13, 1 * target::kWordSize), imm_smi_cid);
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Bind(&error);
__ Stop("Incorrect IC data");
__ Bind(&ok);
#endif
if (FLAG_optimization_counter_threshold >= 0) {
const intptr_t count_offset =
target::ICData::CountIndexFor(num_args) * target::kWordSize;
// Update counter, ignore overflow.
__ addq(Address(R13, count_offset), Immediate(target::ToRawSmi(1)));
}
__ ret();
}
// Generate inline cache check for 'num_args'.
// RDX: receiver (if instance call)
// RBX: ICData
// RSP[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 StubCodeCompiler::GenerateNArgsCheckInlineCacheStub(
Assembler* assembler,
intptr_t num_args,
const RuntimeEntry& handle_ic_miss,
Token::Kind kind,
Optimized optimized,
CallType type,
Exactness exactness) {
ASSERT(num_args == 1 || num_args == 2);
#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(RCX, FieldAddress(RBX, target::ICData::state_bits_offset()));
ASSERT(target::ICData::NumArgsTestedShift() == 0); // No shift needed.
__ andq(RCX, Immediate(target::ICData::NumArgsTestedMask()));
__ cmpq(RCX, Immediate(num_args));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Incorrect stub for IC data");
__ Bind(&ok);
}
#endif // DEBUG
#if !defined(PRODUCT)
Label stepping, done_stepping;
if (optimized == kUnoptimized) {
__ Comment("Check single stepping");
__ LoadIsolate(RAX);
__ cmpb(Address(RAX, target::Isolate::single_step_offset()), Immediate(0));
__ j(NOT_EQUAL, &stepping);
__ Bind(&done_stepping);
}
#endif
Label 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");
// RBX: IC data object (preserved).
__ movq(R13, FieldAddress(RBX, target::ICData::entries_offset()));
// R13: ic_data_array with check entries: classes and target functions.
__ leaq(R13, FieldAddress(R13, target::Array::data_offset()));
// R13: points directly to the first ic data array element.
if (type == kInstanceCall) {
__ LoadTaggedClassIdMayBeSmi(RAX, RDX);
__ movq(R10,
FieldAddress(RBX, target::ICData::arguments_descriptor_offset()));
if (num_args == 2) {
__ movq(RCX,
FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ movq(R9, Address(RSP, RCX, TIMES_4, -target::kWordSize));
__ LoadTaggedClassIdMayBeSmi(RCX, R9);
}
} else {
__ movq(R10,
FieldAddress(RBX, target::ICData::arguments_descriptor_offset()));
__ movq(RCX,
FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ movq(RDX, Address(RSP, RCX, TIMES_4, 0));
__ LoadTaggedClassIdMayBeSmi(RAX, RDX);
if (num_args == 2) {
__ movq(R9, Address(RSP, RCX, TIMES_4, -target::kWordSize));
__ LoadTaggedClassIdMayBeSmi(RCX, R9);
}
}
// RAX: first argument class ID as Smi.
// RCX: second argument class ID as Smi.
// R10: args descriptor
// Loop that checks if there is an IC data match.
Label loop, found, miss;
__ Comment("ICData loop");
// We unroll the generic one that is generated once more than the others.
const bool optimize = kind == Token::kILLEGAL;
const intptr_t target_offset =
target::ICData::TargetIndexFor(num_args) * target::kWordSize;
const intptr_t count_offset =
target::ICData::CountIndexFor(num_args) * target::kWordSize;
const intptr_t exactness_offset =
target::ICData::ExactnessIndexFor(num_args) * target::kWordSize;
__ Bind(&loop);
for (int unroll = optimize ? 4 : 2; unroll >= 0; unroll--) {
Label update;
__ movq(R9, Address(R13, 0));
__ cmpq(RAX, R9); // Class id match?
if (num_args == 2) {
__ j(NOT_EQUAL, &update); // Continue.
__ movq(R9, Address(R13, target::kWordSize));
// R9: next class ID to check (smi).
__ cmpq(RCX, R9); // Class id match?
}
__ j(EQUAL, &found); // Break.
__ Bind(&update);
const intptr_t entry_size = target::ICData::TestEntryLengthFor(
num_args, exactness == kCheckExactness) *
target::kWordSize;
__ addq(R13, Immediate(entry_size)); // Next entry.
__ cmpq(R9, Immediate(target::ToRawSmi(kIllegalCid))); // Done?
if (unroll == 0) {
__ j(NOT_EQUAL, &loop);
} else {
__ j(EQUAL, &miss);
}
}
__ Bind(&miss);
__ Comment("IC miss");
// Compute address of arguments (first read number of arguments from
// arguments descriptor array and then compute address on the stack).
__ movq(RAX, FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ leaq(RAX, Address(RSP, RAX, TIMES_4, 0)); // RAX is Smi.
__ EnterStubFrame();
__ pushq(R10); // Preserve arguments descriptor array.
__ pushq(RBX); // Preserve IC data object.
__ pushq(Immediate(0)); // Result slot.
// Push call arguments.
for (intptr_t i = 0; i < num_args; i++) {
__ movq(RCX, Address(RAX, -target::kWordSize * i));
__ pushq(RCX);
}
__ pushq(RBX); // 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++) {
__ popq(RAX);
}
__ popq(RAX); // Pop returned function object into RAX.
__ popq(RBX); // Restore IC data array.
__ popq(R10); // Restore arguments descriptor array.
__ RestoreCodePointer();
__ LeaveStubFrame();
Label call_target_function;
if (!FLAG_lazy_dispatchers) {
GenerateDispatcherCode(assembler, &call_target_function);
} else {
__ jmp(&call_target_function);
}
__ Bind(&found);
// R13: Pointer to an IC data check group.
Label call_target_function_through_unchecked_entry;
if (exactness == kCheckExactness) {
Label exactness_ok;
ASSERT(num_args == 1);
__ movq(RAX, Address(R13, exactness_offset));
__ cmpq(RAX, Immediate(target::ToRawSmi(
StaticTypeExactnessState::HasExactSuperType().Encode())));
__ j(LESS, &exactness_ok);
__ j(EQUAL, &call_target_function_through_unchecked_entry);
// Check trivial exactness.
// Note: RawICData::receivers_static_type_ is guaranteed to be not null
// because we only emit calls to this stub when it is not null.
__ movq(RCX,
FieldAddress(RBX, target::ICData::receivers_static_type_offset()));
__ movq(RCX, FieldAddress(RCX, target::Type::arguments_offset()));
// RAX contains an offset to type arguments in words as a smi,
// hence TIMES_4. RDX is guaranteed to be non-smi because it is expected to
// have type arguments.
__ cmpq(RCX, FieldAddress(RDX, RAX, TIMES_4, 0));
__ j(EQUAL, &call_target_function_through_unchecked_entry);
// Update exactness state (not-exact anymore).
__ movq(Address(R13, exactness_offset),
Immediate(target::ToRawSmi(
StaticTypeExactnessState::NotExact().Encode())));
__ Bind(&exactness_ok);
}
__ movq(RAX, Address(R13, target_offset));
if (FLAG_optimization_counter_threshold >= 0) {
__ Comment("Update ICData counter");
// Ignore overflow.
__ addq(Address(R13, count_offset), Immediate(target::ToRawSmi(1)));
}
__ Comment("Call target (via checked entry point)");
__ Bind(&call_target_function);
// RAX: Target function.
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ jmp(FieldAddress(RAX, target::Function::entry_point_offset()));
if (exactness == kCheckExactness) {
__ Bind(&call_target_function_through_unchecked_entry);
if (FLAG_optimization_counter_threshold >= 0) {
__ Comment("Update ICData counter");
// Ignore overflow.
__ addq(Address(R13, count_offset), Immediate(target::ToRawSmi(1)));
}
__ Comment("Call target (via unchecked entry point)");
__ movq(RAX, Address(R13, target_offset));
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ jmp(FieldAddress(RAX, target::Function::unchecked_entry_point_offset()));
}
#if !defined(PRODUCT)
if (optimized == kUnoptimized) {
__ Bind(&stepping);
__ EnterStubFrame();
if (type == kInstanceCall) {
__ pushq(RDX); // Preserve receiver.
}
__ pushq(RBX); // Preserve ICData.
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ popq(RBX); // Restore ICData.
if (type == kInstanceCall) {
__ popq(RDX); // Restore receiver.
}
__ RestoreCodePointer();
__ LeaveStubFrame();
__ jmp(&done_stepping);
}
#endif
}
// RDX: receiver
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateOneArgCheckInlineCacheStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kInstanceCall, kIgnoreExactness);
}
// RDX: receiver
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateOneArgCheckInlineCacheWithExactnessCheckStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kInstanceCall, kCheckExactness);
}
// RDX: receiver
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateTwoArgsCheckInlineCacheStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kInstanceCall, kIgnoreExactness);
}
// RDX: receiver
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateSmiAddInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kADD,
kUnoptimized, kInstanceCall, kIgnoreExactness);
}
// RDX: receiver
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateSmiLessInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kLT,
kUnoptimized, kInstanceCall, kIgnoreExactness);
}
// RDX: receiver
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateSmiEqualInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kEQ,
kUnoptimized, kInstanceCall, kIgnoreExactness);
}
// RDX: receiver
// RBX: ICData
// RDI: Function
// RSP[0]: return address
void StubCodeCompiler::GenerateOneArgOptimizedCheckInlineCacheStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL,
kOptimized, kInstanceCall, kIgnoreExactness);
}
// RDX: receiver
// RBX: ICData
// RDI: Function
// RSP[0]: return address
void StubCodeCompiler::
GenerateOneArgOptimizedCheckInlineCacheWithExactnessCheckStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL,
kOptimized, kInstanceCall, kCheckExactness);
}
// RDX: receiver
// RBX: ICData
// RDI: Function
// RSP[0]: return address
void StubCodeCompiler::GenerateTwoArgsOptimizedCheckInlineCacheStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kILLEGAL,
kOptimized, kInstanceCall, kIgnoreExactness);
}
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateZeroArgsUnoptimizedStaticCallStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
#if defined(DEBUG)
{
Label ok;
// Check that the IC data array has NumArgsTested() == 0.
// 'NumArgsTested' is stored in the least significant bits of 'state_bits'.
__ movl(RCX, FieldAddress(RBX, target::ICData::state_bits_offset()));
ASSERT(target::ICData::NumArgsTestedShift() == 0); // No shift needed.
__ andq(RCX, Immediate(target::ICData::NumArgsTestedMask()));
__ cmpq(RCX, Immediate(0));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Incorrect IC data for unoptimized static call");
__ Bind(&ok);
}
#endif // DEBUG
#if !defined(PRODUCT)
// Check single stepping.
Label stepping, done_stepping;
__ LoadIsolate(RAX);
__ movzxb(RAX, Address(RAX, target::Isolate::single_step_offset()));
__ cmpq(RAX, Immediate(0));
#if defined(DEBUG)
static const bool kJumpLength = Assembler::kFarJump;
#else
static const bool kJumpLength = Assembler::kNearJump;
#endif // DEBUG
__ j(NOT_EQUAL, &stepping, kJumpLength);
__ Bind(&done_stepping);
#endif
// RBX: IC data object (preserved).
__ movq(R12, FieldAddress(RBX, target::ICData::entries_offset()));
// R12: ic_data_array with entries: target functions and count.
__ leaq(R12, FieldAddress(R12, target::Array::data_offset()));
// R12: points directly to the first ic data array element.
const intptr_t target_offset =
target::ICData::TargetIndexFor(0) * target::kWordSize;
const intptr_t count_offset =
target::ICData::CountIndexFor(0) * target::kWordSize;
if (FLAG_optimization_counter_threshold >= 0) {
// Increment count for this call, ignore overflow.
__ addq(Address(R12, count_offset), Immediate(target::ToRawSmi(1)));
}
// Load arguments descriptor into R10.
__ movq(R10,
FieldAddress(RBX, target::ICData::arguments_descriptor_offset()));
// Get function and call it, if possible.
__ movq(RAX, Address(R12, target_offset));
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ movq(RCX, FieldAddress(RAX, target::Function::entry_point_offset()));
__ jmp(RCX);
#if !defined(PRODUCT)
__ Bind(&stepping);
__ EnterStubFrame();
__ pushq(RBX); // Preserve IC data object.
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ popq(RBX);
__ RestoreCodePointer();
__ LeaveStubFrame();
__ jmp(&done_stepping, Assembler::kNearJump);
#endif
}
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateOneArgUnoptimizedStaticCallStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kStaticCallMissHandlerOneArgRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kStaticCall, kIgnoreExactness);
}
// RBX: ICData
// RSP[0]: return address
void StubCodeCompiler::GenerateTwoArgsUnoptimizedStaticCallStub(
Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, /* scratch */ RCX);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kStaticCallMissHandlerTwoArgsRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kStaticCall, kIgnoreExactness);
}
// Stub for compiling a function and jumping to the compiled code.
// R10: Arguments descriptor.
// RAX: Function.
void StubCodeCompiler::GenerateLazyCompileStub(Assembler* assembler) {
__ EnterStubFrame();
__ pushq(R10); // Preserve arguments descriptor array.
__ pushq(RAX); // Pass function.
__ CallRuntime(kCompileFunctionRuntimeEntry, 1);
__ popq(RAX); // Restore function.
__ popq(R10); // Restore arguments descriptor array.
__ LeaveStubFrame();
// When using the interpreter, the function's code may now point to the
// InterpretCall stub. Make sure RAX, R10, and RBX are preserved.
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ movq(RCX, FieldAddress(RAX, target::Function::entry_point_offset()));
__ jmp(RCX);
}
// Stub for interpreting a function call.
// R10: Arguments descriptor.
// RAX: Function.
void StubCodeCompiler::GenerateInterpretCallStub(Assembler* assembler) {
#if defined(DART_PRECOMPILED_RUNTIME)
__ Stop("Not using interpreter");
#else
__ EnterStubFrame();
#if defined(DEBUG)
{
Label ok;
// Check that we are always entering from Dart code.
__ movq(R8, Immediate(VMTag::kDartCompiledTagId));
__ cmpq(R8, Assembler::VMTagAddress());
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Adjust arguments count for type arguments vector.
__ movq(R11, FieldAddress(R10, target::ArgumentsDescriptor::count_offset()));
__ SmiUntag(R11);
__ cmpq(
FieldAddress(R10, target::ArgumentsDescriptor::type_args_len_offset()),
Immediate(0));
Label args_count_ok;
__ j(EQUAL, &args_count_ok, Assembler::kNearJump);
__ incq(R11);
__ Bind(&args_count_ok);
// Compute argv.
__ leaq(R12,
Address(RBP, R11, TIMES_8,
target::frame_layout.param_end_from_fp * target::kWordSize));
// Indicate decreasing memory addresses of arguments with negative argc.
__ negq(R11);
// Reserve shadow space for args and align frame before entering C++ world.
__ subq(RSP, Immediate(5 * target::kWordSize));
if (OS::ActivationFrameAlignment() > 1) {
__ andq(RSP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
__ movq(CallingConventions::kArg1Reg, RAX); // Function.
__ movq(CallingConventions::kArg2Reg, R10); // Arguments descriptor.
__ movq(CallingConventions::kArg3Reg, R11); // Negative argc.
__ movq(CallingConventions::kArg4Reg, R12); // Argv.
#if defined(_WIN64)
__ movq(Address(RSP, 0 * target::kWordSize), THR); // Thread.
#else
__ movq(CallingConventions::kArg5Reg, THR); // Thread.
#endif
// Save exit frame information to enable stack walking as we are about
// to transition to Dart VM C++ code.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()), RBP);
// Mark that the thread is executing VM code.
__ movq(RAX,
Address(THR, target::Thread::interpret_call_entry_point_offset()));
__ movq(Assembler::VMTagAddress(), RAX);
__ call(RAX);
// Mark that the thread is executing Dart code.
__ movq(Assembler::VMTagAddress(), Immediate(VMTag::kDartCompiledTagId));
// Reset exit frame information in Isolate structure.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()),
Immediate(0));
__ LeaveStubFrame();
__ ret();
#endif // defined(DART_PRECOMPILED_RUNTIME)
}
// RBX: Contains an ICData.
// TOS(0): return address (Dart code).
void StubCodeCompiler::GenerateICCallBreakpointStub(Assembler* assembler) {
#if defined(PRODUCT)
__ Stop("No debugging in PRODUCT mode");
#else
__ EnterStubFrame();
__ pushq(RDX); // Preserve receiver.
__ pushq(RBX); // Preserve IC data.
__ pushq(Immediate(0)); // Result slot.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ popq(CODE_REG); // Original stub.
__ popq(RBX); // Restore IC data.
__ popq(RDX); // Restore receiver.
__ LeaveStubFrame();
__ movq(RAX, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ jmp(RAX); // Jump to original stub.
#endif // defined(PRODUCT)
}
// TOS(0): return address (Dart code).
void StubCodeCompiler::GenerateRuntimeCallBreakpointStub(Assembler* assembler) {
#if defined(PRODUCT)
__ Stop("No debugging in PRODUCT mode");
#else
__ EnterStubFrame();
__ pushq(Immediate(0)); // Result slot.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ popq(CODE_REG); // Original stub.
__ LeaveStubFrame();
__ movq(RAX, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ jmp(RAX); // Jump to original stub.
#endif // defined(PRODUCT)
}
// Called only from unoptimized code.
void StubCodeCompiler::GenerateDebugStepCheckStub(Assembler* assembler) {
#if defined(PRODUCT)
__ Stop("No debugging in PRODUCT mode");
#else
// Check single stepping.
Label stepping, done_stepping;
__ LoadIsolate(RAX);
__ movzxb(RAX, Address(RAX, target::Isolate::single_step_offset()));
__ cmpq(RAX, Immediate(0));
__ j(NOT_EQUAL, &stepping, Assembler::kNearJump);
__ Bind(&done_stepping);
__ ret();
__ Bind(&stepping);
__ EnterStubFrame();
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ LeaveStubFrame();
__ jmp(&done_stepping, Assembler::kNearJump);
#endif // defined(PRODUCT)
}
// Used to check class and type arguments. Arguments passed in registers:
//
// Inputs:
// - R9 : RawSubtypeTestCache
// - RAX : instance to test against.
// - RDX : instantiator type arguments (for n=4).
// - RCX : function type arguments (for n=4).
//
// - TOS + 0: return address.
//
// Preserves R9/RAX/RCX/RDX, RBX.
//
// Result in R8: null -> not found, otherwise result (true or false).
static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
ASSERT(n == 1 || n == 2 || n == 4 || n == 6);
const Register kCacheReg = R9;
const Register kInstanceReg = RAX;
const Register kInstantiatorTypeArgumentsReg = RDX;
const Register kFunctionTypeArgumentsReg = RCX;
const Register kInstanceCidOrFunction = R10;
const Register kInstanceInstantiatorTypeArgumentsReg = R13;
const Register kInstanceParentFunctionTypeArgumentsReg = PP;
const Register kInstanceDelayedFunctionTypeArgumentsReg = CODE_REG;
const Register kNullReg = R8;
__ LoadObject(kNullReg, NullObject());
// Free up these 2 registers to be used for 6-value test.
if (n >= 6) {
__ pushq(kInstanceParentFunctionTypeArgumentsReg);
__ pushq(kInstanceDelayedFunctionTypeArgumentsReg);
}
// Loop initialization (moved up here to avoid having all dependent loads
// after each other).
__ movq(RSI,
FieldAddress(kCacheReg, target::SubtypeTestCache::cache_offset()));
__ addq(RSI, Immediate(target::Array::data_offset() - kHeapObjectTag));
Label loop, not_closure;
if (n >= 4) {
__ LoadClassIdMayBeSmi(kInstanceCidOrFunction, kInstanceReg);
} else {
__ LoadClassId(kInstanceCidOrFunction, kInstanceReg);
}
__ cmpq(kInstanceCidOrFunction, Immediate(kClosureCid));
__ j(NOT_EQUAL, &not_closure, Assembler::kNearJump);
// Closure handling.
{
__ movq(kInstanceCidOrFunction,
FieldAddress(kInstanceReg, target::Closure::function_offset()));
if (n >= 2) {
__ movq(
kInstanceInstantiatorTypeArgumentsReg,
FieldAddress(kInstanceReg,
target::Closure::instantiator_type_arguments_offset()));
if (n >= 6) {
ASSERT(n == 6);
__ movq(
kInstanceParentFunctionTypeArgumentsReg,
FieldAddress(kInstanceReg,
target::Closure::function_type_arguments_offset()));
__ movq(kInstanceDelayedFunctionTypeArgumentsReg,
FieldAddress(kInstanceReg,
target::Closure::delayed_type_arguments_offset()));
}
}
__ jmp(&loop, Assembler::kNearJump);
}
// Non-Closure handling.
{
__ Bind(&not_closure);
if (n == 1) {
__ SmiTag(kInstanceCidOrFunction);
} else {
ASSERT(n >= 2);
Label has_no_type_arguments;
// [LoadClassById] also tags [kInstanceCidOrFunction] as a side-effect.
__ LoadClassById(RDI, kInstanceCidOrFunction);
__ movq(kInstanceInstantiatorTypeArgumentsReg, kNullReg);
__ movl(
RDI,
FieldAddress(
RDI,
target::Class::type_arguments_field_offset_in_words_offset()));
__ cmpl(RDI, Immediate(target::Class::kNoTypeArguments));
__ j(EQUAL, &has_no_type_arguments, Assembler::kNearJump);
__ movq(kInstanceInstantiatorTypeArgumentsReg,
FieldAddress(kInstanceReg, RDI, TIMES_8, 0));
__ Bind(&has_no_type_arguments);
if (n >= 6) {
__ movq(kInstanceParentFunctionTypeArgumentsReg, kNullReg);
__ movq(kInstanceDelayedFunctionTypeArgumentsReg, kNullReg);
}
}
}
Label found, not_found, next_iteration;
// Loop header.
__ Bind(&loop);
__ movq(
RDI,
Address(RSI, target::kWordSize *
target::SubtypeTestCache::kInstanceClassIdOrFunction));
__ cmpq(RDI, kNullReg);
__ j(EQUAL, &not_found, Assembler::kNearJump);
__ cmpq(RDI, kInstanceCidOrFunction);
if (n == 1) {
__ j(EQUAL, &found, Assembler::kNearJump);
} else {
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ cmpq(kInstanceInstantiatorTypeArgumentsReg,
Address(RSI, target::kWordSize *
target::SubtypeTestCache::kInstanceTypeArguments));
if (n == 2) {
__ j(EQUAL, &found, Assembler::kNearJump);
} else {
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ cmpq(
kInstantiatorTypeArgumentsReg,
Address(RSI,
target::kWordSize *
target::SubtypeTestCache::kInstantiatorTypeArguments));
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ cmpq(
kFunctionTypeArgumentsReg,
Address(RSI, target::kWordSize *
target::SubtypeTestCache::kFunctionTypeArguments));
if (n == 4) {
__ j(EQUAL, &found, Assembler::kNearJump);
} else {
ASSERT(n == 6);
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ cmpq(kInstanceParentFunctionTypeArgumentsReg,
Address(RSI, target::kWordSize *
target::SubtypeTestCache::
kInstanceParentFunctionTypeArguments));
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ cmpq(kInstanceDelayedFunctionTypeArgumentsReg,
Address(RSI, target::kWordSize *
target::SubtypeTestCache::
kInstanceDelayedFunctionTypeArguments));
__ j(EQUAL, &found, Assembler::kNearJump);
}
}
}
__ Bind(&next_iteration);
__ addq(RSI, Immediate(target::kWordSize *
target::SubtypeTestCache::kTestEntryLength));
__ jmp(&loop, Assembler::kNearJump);
__ Bind(&found);
__ movq(R8, Address(RSI, target::kWordSize *
target::SubtypeTestCache::kTestResult));
if (n >= 6) {
__ popq(kInstanceDelayedFunctionTypeArgumentsReg);
__ popq(kInstanceParentFunctionTypeArgumentsReg);
}
__ ret();
__ Bind(&not_found);
if (n >= 6) {
__ popq(kInstanceDelayedFunctionTypeArgumentsReg);
__ popq(kInstanceParentFunctionTypeArgumentsReg);
}
__ ret();
}
// See comment on [GenerateSubtypeNTestCacheStub].
void StubCodeCompiler::GenerateSubtype1TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 1);
}
// See comment on [GenerateSubtypeNTestCacheStub].
void StubCodeCompiler::GenerateSubtype2TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 2);
}
// See comment on [GenerateSubtypeNTestCacheStub].
void StubCodeCompiler::GenerateSubtype4TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 4);
}
// See comment on [GenerateSubtypeNTestCacheStub].
void StubCodeCompiler::GenerateSubtype6TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 6);
}
// Used to test whether a given value is of a given type (different variants,
// all have the same calling convention).
//
// Inputs:
// - R9 : RawSubtypeTestCache
// - RAX : instance to test against.
// - RDX : instantiator type arguments (if needed).
// - RCX : function type arguments (if needed).
//
// - RBX : type to test against.
// - R10 : name of destination variable.
//
// Preserves R9/RAX/RCX/RDX, RBX, R10.
//
// Note of warning: The caller will not populate CODE_REG and we have therefore
// no access to the pool.
void StubCodeCompiler::GenerateDefaultTypeTestStub(Assembler* assembler) {
Label done;
const Register kInstanceReg = RAX;
// Fast case for 'null'.
__ CompareObject(kInstanceReg, NullObject());
__ BranchIf(EQUAL, &done);
__ movq(CODE_REG, Address(THR, target::Thread::slow_type_test_stub_offset()));
__ jmp(FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ Bind(&done);
__ Ret();
}
void StubCodeCompiler::GenerateTopTypeTypeTestStub(Assembler* assembler) {
__ Ret();
}
void StubCodeCompiler::GenerateTypeRefTypeTestStub(Assembler* assembler) {
const Register kTypeRefReg = RBX;
// We dereference the TypeRef and tail-call to it's type testing stub.
__ movq(kTypeRefReg,
FieldAddress(kTypeRefReg, target::TypeRef::type_offset()));
__ jmp(FieldAddress(
kTypeRefReg, target::AbstractType::type_test_stub_entry_point_offset()));
}
void StubCodeCompiler::GenerateUnreachableTypeTestStub(Assembler* assembler) {
__ Breakpoint();
}
static void InvokeTypeCheckFromTypeTestStub(Assembler* assembler,
TypeCheckMode mode) {
const Register kInstanceReg = RAX;
const Register kInstantiatorTypeArgumentsReg = RDX;
const Register kFunctionTypeArgumentsReg = RCX;
const Register kDstTypeReg = RBX;
const Register kSubtypeTestCacheReg = R9;
__ PushObject(NullObject()); // Make room for result.
__ pushq(kInstanceReg);
__ pushq(kDstTypeReg);
__ pushq(kInstantiatorTypeArgumentsReg);
__ pushq(kFunctionTypeArgumentsReg);
__ PushObject(NullObject());
__ pushq(kSubtypeTestCacheReg);
__ PushImmediate(Immediate(target::ToRawSmi(mode)));
__ CallRuntime(kTypeCheckRuntimeEntry, 7);
__ Drop(1);
__ popq(kSubtypeTestCacheReg);
__ Drop(1);
__ popq(kFunctionTypeArgumentsReg);
__ popq(kInstantiatorTypeArgumentsReg);
__ popq(kDstTypeReg);
__ popq(kInstanceReg);
__ Drop(1); // Discard return value.
}
void StubCodeCompiler::GenerateLazySpecializeTypeTestStub(
Assembler* assembler) {
const Register kInstanceReg = RAX;
Label done;
// Fast case for 'null'.
__ CompareObject(kInstanceReg, NullObject());
__ BranchIf(EQUAL, &done);
__ movq(
CODE_REG,
Address(THR, target::Thread::lazy_specialize_type_test_stub_offset()));
__ EnterStubFrame();
InvokeTypeCheckFromTypeTestStub(assembler, kTypeCheckFromLazySpecializeStub);
__ LeaveStubFrame();
__ Bind(&done);
__ Ret();
}
void StubCodeCompiler::GenerateSlowTypeTestStub(Assembler* assembler) {
Label done, call_runtime;
const Register kInstanceReg = RAX;
const Register kDstTypeReg = RBX;
const Register kSubtypeTestCacheReg = R9;
__ EnterStubFrame();
#ifdef DEBUG
// Guaranteed by caller.
Label no_error;
__ CompareObject(kInstanceReg, NullObject());
__ BranchIf(NOT_EQUAL, &no_error);
__ Breakpoint();
__ Bind(&no_error);
#endif
// If the subtype-cache is null, it needs to be lazily-created by the runtime.
__ CompareObject(kSubtypeTestCacheReg, NullObject());
__ BranchIf(EQUAL, &call_runtime);
const Register kTmp = RDI;
// If this is not a [Type] object, we'll go to the runtime.
Label is_simple_case, is_complex_case;
__ LoadClassId(kTmp, kDstTypeReg);
__ cmpq(kTmp, Immediate(kTypeCid));
__ BranchIf(NOT_EQUAL, &is_complex_case);
// Check whether this [Type] is instantiated/uninstantiated.
__ cmpb(FieldAddress(kDstTypeReg, target::Type::type_state_offset()),
Immediate(target::RawAbstractType::kTypeStateFinalizedInstantiated));
__ BranchIf(NOT_EQUAL, &is_complex_case);
// Check whether this [Type] is a function type.
__ movq(kTmp, FieldAddress(kDstTypeReg, target::Type::signature_offset()));
__ CompareObject(kTmp, NullObject());
__ BranchIf(NOT_EQUAL, &is_complex_case);
// This [Type] could be a FutureOr. Subtype2TestCache does not support Smi.
__ BranchIfSmi(kInstanceReg, &is_complex_case);
// Fall through to &is_simple_case
__ Bind(&is_simple_case);
{
__ Call(StubCodeSubtype2TestCache());
__ CompareObject(R8, CastHandle<Object>(TrueObject()));
__ BranchIf(EQUAL, &done); // Cache said: yes.
__ Jump(&call_runtime);
}
__ Bind(&is_complex_case);
{
__ Call(StubCodeSubtype6TestCache());
__ CompareObject(R8, CastHandle<Object>(TrueObject()));
__ BranchIf(EQUAL, &done); // Cache said: yes.
// Fall through to runtime_call
}
__ Bind(&call_runtime);
// We cannot really ensure here that dynamic/Object/void never occur here
// (though it is guaranteed at dart_precompiled_runtime time). This is
// because we do constant evaluation with default stubs and only install
// optimized versions before writing out the AOT snapshot.
// So dynamic/Object/void will run with default stub in constant evaluation.
__ CompareObject(kDstTypeReg, CastHandle<Object>(DynamicType()));
__ BranchIf(EQUAL, &done);
__ CompareObject(kDstTypeReg, CastHandle<Object>(ObjectType()));
__ BranchIf(EQUAL, &done);
__ CompareObject(kDstTypeReg, CastHandle<Object>(VoidType()));
__ BranchIf(EQUAL, &done);
InvokeTypeCheckFromTypeTestStub(assembler, kTypeCheckFromSlowStub);
__ Bind(&done);
__ LeaveStubFrame();
__ Ret();
}
// Return the current stack pointer address, used to stack alignment
// checks.
// TOS + 0: return address
// Result in RAX.
void StubCodeCompiler::GenerateGetCStackPointerStub(Assembler* assembler) {
__ leaq(RAX, Address(RSP, target::kWordSize));
__ ret();
}
// Jump to a frame on the call stack.
// TOS + 0: return address
// Arg1: program counter
// Arg2: stack pointer
// Arg3: frame_pointer
// Arg4: thread
// No Result.
void StubCodeCompiler::GenerateJumpToFrameStub(Assembler* assembler) {
__ movq(THR, CallingConventions::kArg4Reg);
__ movq(RBP, CallingConventions::kArg3Reg);
__ movq(RSP, CallingConventions::kArg2Reg);
// Set the tag.
__ movq(Assembler::VMTagAddress(), Immediate(VMTag::kDartCompiledTagId));
// Clear top exit frame.
__ movq(Address(THR, target::Thread::top_exit_frame_info_offset()),
Immediate(0));
// Restore the pool pointer.
__ RestoreCodePointer();
if (FLAG_precompiled_mode && FLAG_use_bare_instructions) {
__ movq(PP, Address(THR, target::Thread::global_object_pool_offset()));
} else {
__ LoadPoolPointer(PP);
}
__ jmp(CallingConventions::kArg1Reg); // Jump to program counter.
}
// Run an exception handler. Execution comes from JumpToFrame stub.
//
// The arguments are stored in the Thread object.
// No result.
void StubCodeCompiler::GenerateRunExceptionHandlerStub(Assembler* assembler) {
ASSERT(kExceptionObjectReg == RAX);
ASSERT(kStackTraceObjectReg == RDX);
__ movq(CallingConventions::kArg1Reg,
Address(THR, target::Thread::resume_pc_offset()));
word offset_from_thread = 0;
bool ok = target::CanLoadFromThread(NullObject(), &offset_from_thread);
ASSERT(ok);
__ movq(TMP, Address(THR, offset_from_thread));
// Load the exception from the current thread.
Address exception_addr(THR, target::Thread::active_exception_offset());
__ movq(kExceptionObjectReg, exception_addr);
__ movq(exception_addr, TMP);
// Load the stacktrace from the current thread.
Address stacktrace_addr(THR, target::Thread::active_stacktrace_offset());
__ movq(kStackTraceObjectReg, stacktrace_addr);
__ movq(stacktrace_addr, TMP);
__ jmp(CallingConventions::kArg1Reg); // Jump to continuation point.
}
// Deoptimize a frame on the call stack before rewinding.
// The arguments are stored in the Thread object.
// No result.
void StubCodeCompiler::GenerateDeoptForRewindStub(Assembler* assembler) {
// Push zap value instead of CODE_REG.
__ pushq(Immediate(kZapCodeReg));
// Push the deopt pc.
__ pushq(Address(THR, target::Thread::resume_pc_offset()));
GenerateDeoptimizationSequence(assembler, kEagerDeopt);
// After we have deoptimized, jump to the correct frame.
__ EnterStubFrame();
__ CallRuntime(kRewindPostDeoptRuntimeEntry, 0);
__ LeaveStubFrame();
__ int3();
}
// Calls to the runtime to optimize the given function.
// RDI: function to be reoptimized.
// R10: argument descriptor (preserved).
void StubCodeCompiler::GenerateOptimizeFunctionStub(Assembler* assembler) {
__ movq(CODE_REG, Address(THR, Thread::optimize_stub_offset()));
__ EnterStubFrame();
__ pushq(R10); // Preserve args descriptor.
__ pushq(Immediate(0)); // Result slot.
__ pushq(RDI); // Arg0: function to optimize
__ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);
__ popq(RAX); // Discard argument.
__ popq(RAX); // Get Code object.
__ popq(R10); // Restore argument descriptor.
__ LeaveStubFrame();
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ movq(RCX, FieldAddress(RAX, target::Function::entry_point_offset()));
__ jmp(RCX);
__ int3();
}
// Does identical check (object references are equal or not equal) with special
// checks for boxed numbers.
// Left and right are pushed on stack.
// Return ZF set.
// Note: A Mint cannot contain a value that would fit in Smi.
static void GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
const Register left,
const Register right) {
Label reference_compare, done, check_mint;
// If any of the arguments is Smi do reference compare.
__ testq(left, Immediate(kSmiTagMask));
__ j(ZERO, &reference_compare);
__ testq(right, Immediate(kSmiTagMask));
__ j(ZERO, &reference_compare);
// Value compare for two doubles.
__ CompareClassId(left, kDoubleCid);
__ j(NOT_EQUAL, &check_mint, Assembler::kNearJump);
__ CompareClassId(right, kDoubleCid);
__ j(NOT_EQUAL, &done, Assembler::kFarJump);
// Double values bitwise compare.
__ movq(left, FieldAddress(left, target::Double::value_offset()));
__ cmpq(left, FieldAddress(right, target::Double::value_offset()));
__ jmp(&done, Assembler::kFarJump);
__ Bind(&check_mint);
__ CompareClassId(left, kMintCid);
__ j(NOT_EQUAL, &reference_compare, Assembler::kNearJump);
__ CompareClassId(right, kMintCid);
__ j(NOT_EQUAL, &done, Assembler::kFarJump);
__ movq(left, FieldAddress(left, target::Mint::value_offset()));
__ cmpq(left, FieldAddress(right, target::Mint::value_offset()));
__ jmp(&done, Assembler::kFarJump);
__ Bind(&reference_compare);
__ cmpq(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 StubCodeCompiler::GenerateUnoptimizedIdenticalWithNumberCheckStub(
Assembler* assembler) {
#if !defined(PRODUCT)
// Check single stepping.
Label stepping, done_stepping;
__ LoadIsolate(RAX);
__ movzxb(RAX, Address(RAX, target::Isolate::single_step_offset()));
__ cmpq(RAX, Immediate(0));
__ j(NOT_EQUAL, &stepping);
__ Bind(&done_stepping);
#endif
const Register left = RAX;
const Register right = RDX;
__ movq(left, Address(RSP, 2 * target::kWordSize));
__ movq(right, Address(RSP, 1 * target::kWordSize));
GenerateIdenticalWithNumberCheckStub(assembler, left, right);
__ ret();
#if !defined(PRODUCT)
__ Bind(&stepping);
__ EnterStubFrame();
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ RestoreCodePointer();
__ LeaveStubFrame();
__ jmp(&done_stepping);
#endif
}
// Called from optimized code only.
// TOS + 0: return address
// TOS + 1: right argument.
// TOS + 2: left argument.
// Returns ZF set.
void StubCodeCompiler::GenerateOptimizedIdenticalWithNumberCheckStub(
Assembler* assembler) {
const Register left = RAX;
const Register right = RDX;
__ movq(left, Address(RSP, 2 * target::kWordSize));
__ movq(right, Address(RSP, 1 * target::kWordSize));
GenerateIdenticalWithNumberCheckStub(assembler, left, right);
__ ret();
}
// Called from megamorphic calls.
// RDX: receiver
// RBX: target::MegamorphicCache (preserved)
// Passed to target:
// CODE_REG: target Code
// R10: arguments descriptor
void StubCodeCompiler::GenerateMegamorphicCallStub(Assembler* assembler) {
// Jump if receiver is a smi.
Label smi_case;
__ testq(RDX, Immediate(kSmiTagMask));
// Jump out of line for smi case.
__ j(ZERO, &smi_case, Assembler::kNearJump);
// Loads the cid of the object.
__ LoadClassId(RAX, RDX);
Label cid_loaded;
__ Bind(&cid_loaded);
__ movq(R9, FieldAddress(RBX, target::MegamorphicCache::mask_offset()));
__ movq(RDI, FieldAddress(RBX, target::MegamorphicCache::buckets_offset()));
// R9: mask as a smi.
// RDI: cache buckets array.
// Tag cid as a smi.
__ addq(RAX, RAX);
// Compute the table index.
ASSERT(target::MegamorphicCache::kSpreadFactor == 7);
// Use leaq and subq multiply with 7 == 8 - 1.
__ leaq(RCX, Address(RAX, TIMES_8, 0));
__ subq(RCX, RAX);
Label loop;
__ Bind(&loop);
__ andq(RCX, R9);
const intptr_t base = target::Array::data_offset();
// RCX is smi tagged, but table entries are two words, so TIMES_8.
Label probe_failed;
__ cmpq(RAX, FieldAddress(RDI, RCX, TIMES_8, base));
__ j(NOT_EQUAL, &probe_failed, Assembler::kNearJump);
Label load_target;
__ Bind(&load_target);
// 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.
const auto target_address =
FieldAddress(RDI, RCX, TIMES_8, base + target::kWordSize);
if (FLAG_precompiled_mode && FLAG_use_bare_instructions) {
__ movq(R10,
FieldAddress(
RBX, target::MegamorphicCache::arguments_descriptor_offset()));
__ jmp(target_address);
} else {
__ movq(RAX, target_address);
__ movq(R10,
FieldAddress(
RBX, target::MegamorphicCache::arguments_descriptor_offset()));
__ movq(RCX, FieldAddress(RAX, target::Function::entry_point_offset()));
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ jmp(RCX);
}
// Probe failed, check if it is a miss.
__ Bind(&probe_failed);
__ cmpq(FieldAddress(RDI, RCX, TIMES_8, base),
Immediate(target::ToRawSmi(kIllegalCid)));
__ j(ZERO, &load_target, Assembler::kNearJump);
// Try next entry in the table.
__ AddImmediate(RCX, Immediate(target::ToRawSmi(1)));
__ jmp(&loop);
// Load cid for the Smi case.
__ Bind(&smi_case);
__ movq(RAX, Immediate(kSmiCid));
__ jmp(&cid_loaded);
}
// Called from switchable IC calls.
// RDX: receiver
// RBX: ICData (preserved)
// Passed to target:
// CODE_REG: target Code object
// R10: arguments descriptor
void StubCodeCompiler::GenerateICCallThroughFunctionStub(Assembler* assembler) {
Label loop, found, miss;
__ movq(R13, FieldAddress(RBX, target::ICData::entries_offset()));
__ movq(R10,
FieldAddress(RBX, target::ICData::arguments_descriptor_offset()));
__ leaq(R13, FieldAddress(R13, target::Array::data_offset()));
// R13: first IC entry
__ LoadTaggedClassIdMayBeSmi(RAX, RDX);
// RAX: receiver cid as Smi
__ Bind(&loop);
__ movq(R9, Address(R13, 0));
__ cmpq(RAX, R9);
__ j(EQUAL, &found, Assembler::kNearJump);
ASSERT(target::ToRawSmi(kIllegalCid) == 0);
__ testq(R9, R9);
__ j(ZERO, &miss, Assembler::kNearJump);
const intptr_t entry_length =
target::ICData::TestEntryLengthFor(1, /*tracking_exactness=*/false) *
target::kWordSize;
__ addq(R13, Immediate(entry_length)); // Next entry.
__ jmp(&loop);
__ Bind(&found);
const intptr_t target_offset =
target::ICData::TargetIndexFor(1) * target::kWordSize;
__ movq(RAX, Address(R13, target_offset));
__ movq(RCX, FieldAddress(RAX, target::Function::entry_point_offset()));
__ movq(CODE_REG, FieldAddress(RAX, target::Function::code_offset()));
__ jmp(RCX);
__ Bind(&miss);
__ LoadIsolate(RAX);
__ movq(CODE_REG, Address(RAX, target::Isolate::ic_miss_code_offset()));
__ movq(RCX, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ jmp(RCX);
}
void StubCodeCompiler::GenerateICCallThroughCodeStub(Assembler* assembler) {
Label loop, found, miss;
__ movq(R13, FieldAddress(RBX, target::ICData::entries_offset()));
__ movq(R10,
FieldAddress(RBX, target::ICData::arguments_descriptor_offset()));
__ leaq(R13, FieldAddress(R13, target::Array::data_offset()));
// R13: first IC entry
__ LoadTaggedClassIdMayBeSmi(RAX, RDX);
// RAX: receiver cid as Smi
__ Bind(&loop);
__ movq(R9, Address(R13, 0));
__ cmpq(RAX, R9);
__ j(EQUAL, &found, Assembler::kNearJump);
ASSERT(target::ToRawSmi(kIllegalCid) == 0);
__ testq(R9, R9);
__ j(ZERO, &miss, Assembler::kNearJump);
const intptr_t entry_length =
target::ICData::TestEntryLengthFor(1, /*tracking_exactness=*/false) *
target::kWordSize;
__ addq(R13, Immediate(entry_length)); // Next entry.
__ jmp(&loop);
__ Bind(&found);
const intptr_t code_offset =
target::ICData::CodeIndexFor(1) * target::kWordSize;
const intptr_t entry_offset =
target::ICData::EntryPointIndexFor(1) * target::kWordSize;
if (!(FLAG_precompiled_mode && FLAG_use_bare_instructions)) {
__ movq(CODE_REG, Address(R13, code_offset));
}
__ jmp(Address(R13, entry_offset));
__ Bind(&miss);
__ LoadIsolate(RAX);
__ movq(CODE_REG, Address(RAX, target::Isolate::ic_miss_code_offset()));
__ movq(RCX, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
__ jmp(RCX);
}
// RDX: receiver
// RBX: UnlinkedCall
void StubCodeCompiler::GenerateUnlinkedCallStub(Assembler* assembler) {
__ EnterStubFrame();
__ pushq(RDX); // Preserve receiver.
__ pushq(Immediate(0)); // Result slot.
__ pushq(RDX); // Arg0: Receiver
__ pushq(RBX); // Arg1: UnlinkedCall
__ CallRuntime(kUnlinkedCallRuntimeEntry, 2);
__ popq(RBX);
__ popq(RBX);
__ popq(RBX); // result = IC
__ popq(RDX); // Restore receiver.
__ LeaveStubFrame();
__ movq(CODE_REG,
Address(THR, target::Thread::ic_lookup_through_code_stub_offset()));
__ movq(RCX, FieldAddress(CODE_REG, target::Code::entry_point_offset(
CodeEntryKind::kMonomorphic)));
__ jmp(RCX);
}
// Called from switchable IC calls.
// RDX: receiver
// RBX: SingleTargetCache
// Passed to target::
// CODE_REG: target Code object
void StubCodeCompiler::GenerateSingleTargetCallStub(Assembler* assembler) {
Label miss;
__ LoadClassIdMayBeSmi(RAX, RDX);
__ movzxw(R9,
FieldAddress(RBX, target::SingleTargetCache::lower_limit_offset()));
__ movzxw(R10,
FieldAddress(RBX, target::SingleTargetCache::upper_limit_offset()));
__ cmpq(RAX, R9);
__ j(LESS, &miss, Assembler::kNearJump);
__ cmpq(RAX, R10);
__ j(GREATER, &miss, Assembler::kNearJump);
__ movq(RCX,
FieldAddress(RBX, target::SingleTargetCache::entry_point_offset()));
__ movq(CODE_REG,
FieldAddress(RBX, target::SingleTargetCache::target_offset()));
__ jmp(RCX);
__ Bind(&miss);
__ EnterStubFrame();
__ pushq(RDX); // Preserve receiver.
__ pushq(Immediate(0)); // Result slot.
__ pushq(RDX); // Arg0: Receiver
__ CallRuntime(kSingleTargetMissRuntimeEntry, 1);
__ popq(RBX);
__ popq(RBX); // result = IC
__ popq(RDX); // Restore receiver.
__ LeaveStubFrame();
__ movq(CODE_REG,
Address(THR, target::Thread::ic_lookup_through_code_stub_offset()));
__ movq(RCX, FieldAddress(CODE_REG, target::Code::entry_point_offset(
CodeEntryKind::kMonomorphic)));
__ jmp(RCX);
}
// Called from the monomorphic checked entry.
// RDX: receiver
void StubCodeCompiler::GenerateMonomorphicMissStub(Assembler* assembler) {
__ movq(CODE_REG,
Address(THR, target::Thread::monomorphic_miss_stub_offset()));
__ EnterStubFrame();
__ pushq(RDX); // Preserve receiver.
__ pushq(Immediate(0)); // Result slot.
__ pushq(RDX); // Arg0: Receiver
__ CallRuntime(kMonomorphicMissRuntimeEntry, 1);
__ popq(RBX);
__ popq(RBX); // result = IC
__ popq(RDX); // Restore receiver.
__ LeaveStubFrame();
__ movq(CODE_REG,
Address(THR, target::Thread::ic_lookup_through_code_stub_offset()));
__ movq(RCX, FieldAddress(CODE_REG, target::Code::entry_point_offset(
CodeEntryKind::kMonomorphic)));
__ jmp(RCX);
}
void StubCodeCompiler::GenerateFrameAwaitingMaterializationStub(
Assembler* assembler) {
__ int3();
}
void StubCodeCompiler::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
__ int3();
}
} // namespace compiler
} // namespace dart
#endif // defined(TARGET_ARCH_X64) && !defined(DART_PRECOMPILED_RUNTIME)
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