Google Git
Sign in
dart / sdk.git / d476db7aa872a0f94a4622ccb9f5f05a0442a190 / . / runtime / vm / stub_code_ia32.cc
blob: 4df92d7600f6ff64076827c7d7d902b57e7a16b9 [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h"
#if defined(TARGET_ARCH_IA32)
#include "vm/assembler.h"
#include "vm/compiler.h"
#include "vm/dart_entry.h"
#include "vm/flow_graph_compiler.h"
#include "vm/instructions.h"
#include "vm/heap.h"
#include "vm/object_store.h"
#include "vm/resolver.h"
#include "vm/scavenger.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
#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(int, optimization_counter_threshold);
DECLARE_FLAG(bool, trace_optimized_ic_calls);
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of last argument in argument array.
// ESP + 4*EDX : address of first argument in argument array.
// ESP + 4*EDX + 4 : address of return value.
// ECX : address of the runtime function to call.
// EDX : number of arguments to the call.
// Must preserve callee saved registers EDI and EBX.
void StubCode::GenerateCallToRuntimeStub(Assembler* assembler) {
const intptr_t isolate_offset = NativeArguments::isolate_offset();
const intptr_t argc_tag_offset = NativeArguments::argc_tag_offset();
const intptr_t argv_offset = NativeArguments::argv_offset();
const intptr_t retval_offset = NativeArguments::retval_offset();
__ EnterFrame(0);
// Load current Isolate pointer from Context structure into EAX.
__ movl(EAX, FieldAddress(CTX, Context::isolate_offset()));
// Save exit frame information to enable stack walking as we are about
// to transition to Dart VM C++ code.
__ movl(Address(EAX, Isolate::top_exit_frame_info_offset()), ESP);
// Save current Context pointer into Isolate structure.
__ movl(Address(EAX, Isolate::top_context_offset()), CTX);
// Cache Isolate pointer into CTX while executing runtime code.
__ movl(CTX, EAX);
// Reserve space for arguments and align frame before entering C++ world.
__ AddImmediate(ESP, Immediate(-sizeof(NativeArguments)));
if (OS::ActivationFrameAlignment() > 1) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass NativeArguments structure by value and call runtime.
__ movl(Address(ESP, isolate_offset), CTX); // Set isolate in NativeArgs.
// There are no runtime calls to closures, so we do not need to set the tag
// bits kClosureFunctionBit and kInstanceFunctionBit in argc_tag_.
__ movl(Address(ESP, argc_tag_offset), EDX); // Set argc in NativeArguments.
__ leal(EAX, Address(EBP, EDX, TIMES_4, 1 * kWordSize)); // Compute argv.
__ movl(Address(ESP, argv_offset), EAX); // Set argv in NativeArguments.
__ addl(EAX, Immediate(1 * kWordSize)); // Retval is next to 1st argument.
__ movl(Address(ESP, retval_offset), EAX); // Set retval in NativeArguments.
__ call(ECX);
// Reset exit frame information in Isolate structure.
__ movl(Address(CTX, Isolate::top_exit_frame_info_offset()), Immediate(0));
// Load Context pointer from Isolate structure into ECX.
__ movl(ECX, Address(CTX, Isolate::top_context_offset()));
// Reset Context pointer in Isolate structure.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(Address(CTX, Isolate::top_context_offset()), raw_null);
// Cache Context pointer into CTX while executing Dart code.
__ movl(CTX, ECX);
__ LeaveFrame();
__ ret();
}
// Print the stop message.
DEFINE_LEAF_RUNTIME_ENTRY(void, PrintStopMessage, 1, const char* message) {
OS::Print("Stop message: %s\n", message);
}
END_LEAF_RUNTIME_ENTRY
// Input parameters:
// ESP : points to return address.
// EAX : stop message (const char*).
// Must preserve all registers, except EAX.
void StubCode::GeneratePrintStopMessageStub(Assembler* assembler) {
__ EnterCallRuntimeFrame(1 * kWordSize);
__ movl(Address(ESP, 0), EAX);
__ CallRuntime(kPrintStopMessageRuntimeEntry, 1);
__ LeaveCallRuntimeFrame();
__ ret();
}
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of return value.
// EAX : address of first argument in argument array.
// ECX : address of the native function to call.
// EDX : argc_tag including number of arguments and function kind.
// Uses EDI.
void StubCode::GenerateCallNativeCFunctionStub(Assembler* assembler) {
const intptr_t native_args_struct_offset =
NativeEntry::kNumCallWrapperArguments * kWordSize;
const intptr_t isolate_offset =
NativeArguments::isolate_offset() + native_args_struct_offset;
const intptr_t argc_tag_offset =
NativeArguments::argc_tag_offset() + native_args_struct_offset;
const intptr_t argv_offset =
NativeArguments::argv_offset() + native_args_struct_offset;
const intptr_t retval_offset =
NativeArguments::retval_offset() + native_args_struct_offset;
__ EnterFrame(0);
// Load current Isolate pointer from Context structure into EDI.
__ movl(EDI, FieldAddress(CTX, Context::isolate_offset()));
// Save exit frame information to enable stack walking as we are about
// to transition to dart VM code.
__ movl(Address(EDI, Isolate::top_exit_frame_info_offset()), ESP);
// Save current Context pointer into Isolate structure.
__ movl(Address(EDI, Isolate::top_context_offset()), CTX);
// Cache Isolate pointer into CTX while executing native code.
__ movl(CTX, EDI);
// Reserve space for the native arguments structure, the outgoing parameters
// (pointer to the native arguments structure, the C function entry point)
// and align frame before entering the C++ world.
__ AddImmediate(ESP, Immediate(-sizeof(NativeArguments) - (2 * kWordSize)));
if (OS::ActivationFrameAlignment() > 1) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass NativeArguments structure by value and call native function.
__ movl(Address(ESP, isolate_offset), CTX); // Set isolate in NativeArgs.
__ movl(Address(ESP, argc_tag_offset), EDX); // Set argc in NativeArguments.
__ movl(Address(ESP, argv_offset), EAX); // Set argv in NativeArguments.
__ leal(EAX, Address(EBP, 2 * kWordSize)); // Compute return value addr.
__ movl(Address(ESP, retval_offset), EAX); // Set retval in NativeArguments.
__ leal(EAX, Address(ESP, 2 * kWordSize)); // Pointer to the NativeArguments.
__ movl(Address(ESP, 0), EAX); // Pass the pointer to the NativeArguments.
__ movl(Address(ESP, kWordSize), ECX); // Function to call.
__ call(&NativeEntry::NativeCallWrapperLabel());
// Reset exit frame information in Isolate structure.
__ movl(Address(CTX, Isolate::top_exit_frame_info_offset()), Immediate(0));
// Load Context pointer from Isolate structure into EDI.
__ movl(EDI, Address(CTX, Isolate::top_context_offset()));
// Reset Context pointer in Isolate structure.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(Address(CTX, Isolate::top_context_offset()), raw_null);
// Cache Context pointer into CTX while executing Dart code.
__ movl(CTX, EDI);
__ LeaveFrame();
__ ret();
}
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of return value.
// EAX : address of first argument in argument array.
// ECX : address of the native function to call.
// EDX : argc_tag including number of arguments and function kind.
// Uses EDI.
void StubCode::GenerateCallBootstrapCFunctionStub(Assembler* assembler) {
const intptr_t native_args_struct_offset = kWordSize;
const intptr_t isolate_offset =
NativeArguments::isolate_offset() + native_args_struct_offset;
const intptr_t argc_tag_offset =
NativeArguments::argc_tag_offset() + native_args_struct_offset;
const intptr_t argv_offset =
NativeArguments::argv_offset() + native_args_struct_offset;
const intptr_t retval_offset =
NativeArguments::retval_offset() + native_args_struct_offset;
__ EnterFrame(0);
// Load current Isolate pointer from Context structure into EDI.
__ movl(EDI, FieldAddress(CTX, Context::isolate_offset()));
// Save exit frame information to enable stack walking as we are about
// to transition to dart VM code.
__ movl(Address(EDI, Isolate::top_exit_frame_info_offset()), ESP);
// Save current Context pointer into Isolate structure.
__ movl(Address(EDI, Isolate::top_context_offset()), CTX);
// Cache Isolate pointer into CTX while executing native code.
__ movl(CTX, EDI);
// Reserve space for the native arguments structure, the outgoing parameter
// (pointer to the native arguments structure) and align frame before
// entering the C++ world.
__ AddImmediate(ESP, Immediate(-sizeof(NativeArguments) - kWordSize));
if (OS::ActivationFrameAlignment() > 1) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass NativeArguments structure by value and call native function.
__ movl(Address(ESP, isolate_offset), CTX); // Set isolate in NativeArgs.
__ movl(Address(ESP, argc_tag_offset), EDX); // Set argc in NativeArguments.
__ movl(Address(ESP, argv_offset), EAX); // Set argv in NativeArguments.
__ leal(EAX, Address(EBP, 2 * kWordSize)); // Compute return value addr.
__ movl(Address(ESP, retval_offset), EAX); // Set retval in NativeArguments.
__ leal(EAX, Address(ESP, kWordSize)); // Pointer to the NativeArguments.
__ movl(Address(ESP, 0), EAX); // Pass the pointer to the NativeArguments.
__ call(ECX);
// Reset exit frame information in Isolate structure.
__ movl(Address(CTX, Isolate::top_exit_frame_info_offset()), Immediate(0));
// Load Context pointer from Isolate structure into EDI.
__ movl(EDI, Address(CTX, Isolate::top_context_offset()));
// Reset Context pointer in Isolate structure.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(Address(CTX, Isolate::top_context_offset()), raw_null);
// Cache Context pointer into CTX while executing Dart code.
__ movl(CTX, EDI);
__ LeaveFrame();
__ ret();
}
// Input parameters:
// EDX: arguments descriptor array.
void StubCode::GenerateCallStaticFunctionStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(raw_null); // Setup space on stack for return value.
__ CallRuntime(kPatchStaticCallRuntimeEntry, 0);
__ popl(EAX); // Get Code object result.
__ popl(EDX); // Restore arguments descriptor array.
// Remove the stub frame as we are about to jump to the dart function.
__ LeaveFrame();
__ movl(ECX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(ECX);
}
// Called from a static call only when an invalid code has been entered
// (invalid because its function was optimized or deoptimized).
// EDX: arguments descriptor array.
void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(raw_null); // Setup space on stack for return value.
__ CallRuntime(kFixCallersTargetRuntimeEntry, 0);
__ popl(EAX); // Get Code object.
__ popl(EDX); // Restore arguments descriptor array.
__ movl(EAX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(EAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ LeaveFrame();
__ jmp(EAX);
__ int3();
}
// Input parameters:
// EDX: smi-tagged argument count, may be zero.
// EBP[kParamEndSlotFromFp + 1]: last argument.
// Uses EAX, EBX, ECX, EDX.
static void PushArgumentsArray(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Allocate array to store arguments of caller.
__ movl(ECX, raw_null); // Null element type for raw Array.
__ call(&StubCode::AllocateArrayLabel());
__ SmiUntag(EDX);
// EAX: newly allocated array.
// EDX: length of the array (was preserved by the stub).
__ pushl(EAX); // Array is in EAX and on top of stack.
__ leal(EBX, Address(EBP, EDX, TIMES_4, kParamEndSlotFromFp * kWordSize));
__ leal(ECX, FieldAddress(EAX, Array::data_offset()));
// EBX: address of first argument on stack.
// ECX: address of first argument in array.
Label loop, loop_condition;
__ jmp(&loop_condition, Assembler::kNearJump);
__ Bind(&loop);
__ movl(EAX, Address(EBX, 0));
__ movl(Address(ECX, 0), EAX);
__ AddImmediate(ECX, Immediate(kWordSize));
__ AddImmediate(EBX, Immediate(-kWordSize));
__ Bind(&loop_condition);
__ decl(EDX);
__ j(POSITIVE, &loop, Assembler::kNearJump);
}
// Input parameters:
// ECX: ic-data.
// EDX: arguments descriptor array.
// Note: The receiver object is the first argument to the function being
// called, the stub accesses the receiver from this location directly
// when trying to resolve the call.
// Uses EDI.
void StubCode::GenerateInstanceFunctionLookupStub(Assembler* assembler) {
__ EnterStubFrame();
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ pushl(raw_null); // Space for the return value.
// Push the receiver as an argument. Load the smi-tagged argument
// count into EDI to index the receiver in the stack. There are
// three words (null, stub's pc marker, saved fp) above the return
// address.
__ movl(EDI, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ pushl(Address(ESP, EDI, TIMES_2, (3 * kWordSize)));
__ pushl(ECX); // Pass IC data object.
__ pushl(EDX); // Pass arguments descriptor array.
// Pass the call's arguments array.
__ movl(EDX, EDI); // Smi-tagged arguments array length.
PushArgumentsArray(assembler);
__ CallRuntime(kInstanceFunctionLookupRuntimeEntry, 4);
// Remove arguments.
__ Drop(4);
__ popl(EAX); // Get result into EAX.
__ LeaveFrame();
__ ret();
}
DECLARE_LEAF_RUNTIME_ENTRY(intptr_t, DeoptimizeCopyFrame,
intptr_t deopt_reason,
uword saved_registers_address);
DECLARE_LEAF_RUNTIME_ENTRY(void, DeoptimizeFillFrame, uword last_fp);
// Used by eager and lazy deoptimization. Preserve result in EAX if necessary.
// This stub translates optimized frame into unoptimized frame. The optimized
// frame can contain values in registers and on stack, the unoptimized
// frame contains all values on stack.
// Deoptimization occurs in following steps:
// - Push all registers that can contain values.
// - Call C routine to copy the stack and saved registers into temporary buffer.
// - Adjust caller's frame to correct unoptimized frame size.
// - Fill the unoptimized frame.
// - Materialize objects that require allocation (e.g. Double instances).
// GC can occur only after frame is fully rewritten.
// Stack after EnterDartFrame(0) below:
// +------------------+
// | PC marker | <- TOS
// +------------------+
// | Saved FP | <- FP of stub
// +------------------+
// | return-address | (deoptimization point)
// +------------------+
// | ... | <- SP of optimized frame
//
// Parts of the code cannot GC, part of the code can GC.
static void GenerateDeoptimizationSequence(Assembler* assembler,
bool preserve_result) {
// Leaf runtime function DeoptimizeCopyFrame expects a Dart frame.
__ EnterDartFrame(0);
// The code in this frame may not cause GC. kDeoptimizeCopyFrameRuntimeEntry
// and kDeoptimizeFillFrameRuntimeEntry are leaf runtime calls.
const intptr_t saved_result_slot_from_fp =
kFirstLocalSlotFromFp + 1 - (kNumberOfCpuRegisters - EAX);
// Result in EAX is preserved as part of pushing all registers below.
// Push registers in their enumeration order: lowest register number at
// lowest address.
for (intptr_t i = kNumberOfCpuRegisters - 1; i >= 0; i--) {
__ pushl(static_cast<Register>(i));
}
__ subl(ESP, Immediate(kNumberOfXmmRegisters * kFpuRegisterSize));
intptr_t offset = 0;
for (intptr_t reg_idx = 0; reg_idx < kNumberOfXmmRegisters; ++reg_idx) {
XmmRegister xmm_reg = static_cast<XmmRegister>(reg_idx);
__ movups(Address(ESP, offset), xmm_reg);
offset += kFpuRegisterSize;
}
__ movl(ECX, ESP); // Preserve saved registers block.
__ ReserveAlignedFrameSpace(1 * kWordSize);
__ movl(Address(ESP, 0), ECX); // Start of register block.
__ CallRuntime(kDeoptimizeCopyFrameRuntimeEntry, 1);
// Result (EAX) is stack-size (FP - SP) in bytes.
if (preserve_result) {
// Restore result into EBX temporarily.
__ movl(EBX, Address(EBP, saved_result_slot_from_fp * kWordSize));
}
__ LeaveFrame();
__ popl(EDX); // Preserve return address.
__ movl(ESP, EBP); // Discard optimized frame.
__ subl(ESP, EAX); // Reserve space for deoptimized frame.
__ pushl(EDX); // Restore return address.
// Leaf runtime function DeoptimizeFillFrame expects a Dart frame.
__ EnterDartFrame(0);
if (preserve_result) {
__ pushl(EBX); // Preserve result as first local.
}
__ ReserveAlignedFrameSpace(1 * kWordSize);
__ movl(Address(ESP, 0), EBP); // Pass last FP as parameter on stack.
__ CallRuntime(kDeoptimizeFillFrameRuntimeEntry, 1);
if (preserve_result) {
// Restore result into EBX.
__ movl(EBX, Address(EBP, kFirstLocalSlotFromFp * kWordSize));
}
// Code above cannot cause GC.
__ LeaveFrame();
// Frame is fully rewritten at this point and it is safe to perform a GC.
// Materialize any objects that were deferred by FillFrame because they
// require allocation.
__ EnterStubFrame();
if (preserve_result) {
__ pushl(EBX); // Preserve result, it will be GC-d here.
}
__ pushl(Immediate(Smi::RawValue(0))); // Space for the result.
__ CallRuntime(kDeoptimizeMaterializeRuntimeEntry, 0);
// Result tells stub how many bytes to remove from the expression stack
// of the bottom-most frame. They were used as materialization arguments.
__ popl(EBX);
__ SmiUntag(EBX);
if (preserve_result) {
__ popl(EAX); // Restore result.
}
__ LeaveFrame();
__ popl(ECX); // Pop return address.
__ addl(ESP, EBX); // Remove materialization arguments.
__ pushl(ECX); // Push return address.
__ ret();
}
// TOS: return address + call-instruction-size (5 bytes).
// EAX: result, must be preserved
void StubCode::GenerateDeoptimizeLazyStub(Assembler* assembler) {
// Correct return address to point just after the call that is being
// deoptimized.
__ popl(EBX);
__ subl(EBX, Immediate(CallPattern::InstructionLength()));
__ pushl(EBX);
GenerateDeoptimizationSequence(assembler, true); // Preserve EAX.
}
void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
GenerateDeoptimizationSequence(assembler, false); // Don't preserve EAX.
}
void StubCode::GenerateMegamorphicMissStub(Assembler* assembler) {
__ EnterStubFrame();
// Load the receiver into EAX. The argument count in the arguments
// descriptor in EDX is a smi.
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
// Two words (saved fp, stub's pc marker) in the stack above the return
// address.
__ movl(EAX, Address(ESP, EAX, TIMES_2, 2 * kWordSize));
// Preserve IC data and arguments descriptor.
__ pushl(ECX);
__ pushl(EDX);
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Instructions::null()));
__ pushl(raw_null); // Space for the result of the runtime call.
__ pushl(EAX); // Pass receiver.
__ pushl(ECX); // Pass IC data.
__ pushl(EDX); // Pass arguments descriptor.
__ CallRuntime(kMegamorphicCacheMissHandlerRuntimeEntry, 3);
// Discard arguments.
__ popl(EAX);
__ popl(EAX);
__ popl(EAX);
__ popl(EAX); // Return value from the runtime call (instructions).
__ popl(EDX); // Restore arguments descriptor.
__ popl(ECX); // Restore IC data.
__ LeaveFrame();
Label lookup;
__ cmpl(EAX, raw_null);
__ j(EQUAL, &lookup, Assembler::kNearJump);
__ addl(EAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(EAX);
__ Bind(&lookup);
__ jmp(&StubCode::InstanceFunctionLookupLabel());
}
// Called for inline allocation of arrays.
// Input parameters:
// EDX : Array length as Smi.
// ECX : array element type (either NULL or an instantiated type).
// Uses EAX, EBX, ECX, EDI as temporary registers.
// NOTE: EDX cannot be clobbered here as the caller relies on it being saved.
// The newly allocated object is returned in EAX.
void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
Label slow_case;
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
if (FLAG_inline_alloc) {
// Compute the size to be allocated, it is based on the array length
// and is computed as:
// RoundedAllocationSize((array_length * kwordSize) + sizeof(RawArray)).
// Assert that length is a Smi.
__ testl(EDX, Immediate(kSmiTagMask));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(NOT_ZERO, &slow_case);
}
__ movl(EDI, FieldAddress(CTX, Context::isolate_offset()));
__ movl(EDI, Address(EDI, Isolate::heap_offset()));
__ movl(EDI, Address(EDI, Heap::new_space_offset()));
// Calculate and align allocation size.
// Load new object start and calculate next object start.
// ECX: array element type.
// EDX: Array length as Smi.
// EDI: Points to new space object.
__ movl(EAX, Address(EDI, Scavenger::top_offset()));
intptr_t fixed_size = sizeof(RawArray) + kObjectAlignment - 1;
__ leal(EBX, Address(EDX, TIMES_2, fixed_size)); // EDX is Smi.
ASSERT(kSmiTagShift == 1);
__ andl(EBX, Immediate(-kObjectAlignment));
__ leal(EBX, Address(EAX, EBX, TIMES_1, 0));
// Check if the allocation fits into the remaining space.
// EAX: potential new object start.
// EBX: potential next object start.
// ECX: array element type.
// EDX: Array length as Smi.
// EDI: Points to new space object.
__ cmpl(EBX, Address(EDI, Scavenger::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.
// EAX: potential new object start.
// EBX: potential next object start.
// EDX: Array length as Smi.
// EDI: Points to new space object.
__ movl(Address(EDI, Scavenger::top_offset()), EBX);
__ addl(EAX, Immediate(kHeapObjectTag));
// EAX: new object start as a tagged pointer.
// EBX: new object end address.
// ECX: array element type.
// EDX: Array length as Smi.
// Store the type argument field.
__ StoreIntoObjectNoBarrier(
EAX,
FieldAddress(EAX, Array::type_arguments_offset()),
ECX);
// Set the length field.
__ StoreIntoObjectNoBarrier(
EAX,
FieldAddress(EAX, Array::length_offset()),
EDX);
// Calculate the size tag.
// EAX: new object start as a tagged pointer.
// EBX: new object end address.
// EDX: Array length as Smi.
{
Label size_tag_overflow, done;
__ leal(ECX, Address(EDX, TIMES_2, fixed_size)); // EDX is Smi.
ASSERT(kSmiTagShift == 1);
__ andl(ECX, Immediate(-kObjectAlignment));
__ cmpl(ECX, Immediate(RawObject::SizeTag::kMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
__ shll(ECX, Immediate(RawObject::kSizeTagBit - kObjectAlignmentLog2));
__ jmp(&done);
__ Bind(&size_tag_overflow);
__ movl(ECX, Immediate(0));
__ Bind(&done);
// Get the class index and insert it into the tags.
__ orl(ECX, Immediate(RawObject::ClassIdTag::encode(kArrayCid)));
__ movl(FieldAddress(EAX, Array::tags_offset()), ECX);
}
// Initialize all array elements to raw_null.
// EAX: new object start as a tagged pointer.
// EBX: new object end address.
// EDX: Array length as Smi.
__ leal(ECX, FieldAddress(EAX, Array::data_offset()));
// ECX: iterator which initially points to the start of the variable
// data area to be initialized.
Label done;
Label init_loop;
__ Bind(&init_loop);
__ cmpl(ECX, EBX);
__ j(ABOVE_EQUAL, &done, Assembler::kNearJump);
// TODO(cshapiro): StoreIntoObjectNoBarrier
__ movl(Address(ECX, 0), raw_null);
__ addl(ECX, Immediate(kWordSize));
__ jmp(&init_loop, Assembler::kNearJump);
__ Bind(&done);
// Done allocating and initializing the array.
// EAX: new object.
// EDX: Array length as Smi (preserved for the caller.)
__ ret();
}
// Unable to allocate the array using the fast inline code, just call
// into the runtime.
__ Bind(&slow_case);
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EDX); // Array length as Smi.
__ pushl(ECX); // Element type.
__ CallRuntime(kAllocateArrayRuntimeEntry, 2);
__ popl(EAX); // Pop element type argument.
__ popl(EDX); // Pop array length argument.
__ popl(EAX); // Pop return value from return slot.
__ LeaveFrame();
__ ret();
}
// Input parameters:
// EDX: Arguments descriptor array.
// Note: The closure object is the first argument to the function being
// called, the stub accesses the closure from this location directly
// when trying to resolve the call.
// Uses EDI.
void StubCode::GenerateCallClosureFunctionStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Load num_args.
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
// Load closure object in EDI.
__ movl(EDI, Address(ESP, EAX, TIMES_2, 0)); // EAX is a Smi.
// Verify that EDI is a closure by checking its class.
Label not_closure;
__ cmpl(EDI, raw_null);
// Not a closure, but null object.
__ j(EQUAL, &not_closure, Assembler::kNearJump);
__ testl(EDI, Immediate(kSmiTagMask));
__ j(ZERO, &not_closure, Assembler::kNearJump); // Not a closure, but a smi.
// Verify that the class of the object is a closure class by checking that
// class.signature_function() is not null.
__ LoadClass(EAX, EDI, ECX);
__ movl(EAX, FieldAddress(EAX, Class::signature_function_offset()));
__ cmpl(EAX, raw_null);
// Actual class is not a closure class.
__ j(EQUAL, &not_closure, Assembler::kNearJump);
// EAX is just the signature function. Load the actual closure function.
__ movl(ECX, FieldAddress(EDI, Closure::function_offset()));
// Load closure context in CTX; note that CTX has already been preserved.
__ movl(CTX, FieldAddress(EDI, Closure::context_offset()));
// Load closure function code in EAX.
__ movl(EAX, FieldAddress(ECX, Function::code_offset()));
__ cmpl(EAX, raw_null);
Label function_compiled;
__ j(NOT_EQUAL, &function_compiled, Assembler::kNearJump);
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve read-only function object argument.
__ CallRuntime(kCompileFunctionRuntimeEntry, 1);
__ popl(ECX); // Restore read-only function object argument in ECX.
__ popl(EDX); // Restore arguments descriptor array.
// Restore EAX.
__ movl(EAX, FieldAddress(ECX, Function::code_offset()));
// Remove the stub frame as we are about to jump to the closure function.
__ LeaveFrame();
__ Bind(&function_compiled);
// EAX: Code.
// ECX: Function.
// EDX: Arguments descriptor array.
__ movl(ECX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(ECX);
__ Bind(&not_closure);
// Call runtime to attempt to resolve and invoke a call method on a
// non-closure object, passing the non-closure object and its arguments array,
// returning here.
// If no call method exists, throw a NoSuchMethodError.
// EDI: non-closure object.
// EDX: arguments descriptor array.
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for result from error reporting.
__ pushl(EDX); // Arguments descriptor.
// Load smi-tagged arguments array length, including the non-closure.
__ movl(EDX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
PushArgumentsArray(assembler);
__ CallRuntime(kInvokeNonClosureRuntimeEntry, 2);
// Remove arguments.
__ Drop(2);
__ popl(EAX); // Get result into EAX.
// Remove the stub frame as we are about to return.
__ LeaveFrame();
__ ret();
}
// Called when invoking dart code from C++ (VM code).
// Input parameters:
// ESP : points to return address.
// ESP + 4 : entrypoint of the dart function to call.
// ESP + 8 : arguments descriptor array.
// ESP + 12 : arguments array.
// ESP + 16 : new context containing the current isolate pointer.
// Uses EAX, EDX, ECX, EDI as temporary registers.
void StubCode::GenerateInvokeDartCodeStub(Assembler* assembler) {
const int kEntryPointOffset = 2 * kWordSize;
const int kArgumentsDescOffset = 3 * kWordSize;
const int kArgumentsOffset = 4 * kWordSize;
const int kNewContextOffset = 5 * kWordSize;
// Save frame pointer coming in.
__ EnterFrame(0);
// Save C++ ABI callee-saved registers.
__ pushl(EBX);
__ pushl(ESI);
__ pushl(EDI);
// The new Context structure contains a pointer to the current Isolate
// structure. Cache the Context pointer in the CTX register so that it is
// available in generated code and calls to Isolate::Current() need not be
// done. The assumption is that this register will never be clobbered by
// compiled or runtime stub code.
// Cache the new Context pointer into CTX while executing dart code.
__ movl(CTX, Address(EBP, kNewContextOffset));
__ movl(CTX, Address(CTX, VMHandles::kOffsetOfRawPtrInHandle));
// Load Isolate pointer from Context structure into EDI.
__ movl(EDI, FieldAddress(CTX, Context::isolate_offset()));
// Save the top exit frame info. Use EDX as a temporary register.
// StackFrameIterator reads the top exit frame info saved in this frame.
// The constant kExitLinkSlotFromEntryFp must be kept in sync with the
// code below.
ASSERT(kExitLinkSlotFromEntryFp == -4);
__ movl(EDX, Address(EDI, Isolate::top_exit_frame_info_offset()));
__ pushl(EDX);
__ movl(Address(EDI, Isolate::top_exit_frame_info_offset()), Immediate(0));
// Save the old Context pointer. Use ECX as a temporary register.
// Note that VisitObjectPointers will find this saved Context pointer during
// GC marking, since it traverses any information between SP and
// FP - kExitLinkSlotFromEntryFp.
// EntryFrame::SavedContext reads the context saved in this frame.
// The constant kSavedContextSlotFromEntryFp must be kept in sync with
// the code below.
ASSERT(kSavedContextSlotFromEntryFp == -5);
__ movl(ECX, Address(EDI, Isolate::top_context_offset()));
__ pushl(ECX);
// Load arguments descriptor array into EDX.
__ movl(EDX, Address(EBP, kArgumentsDescOffset));
__ movl(EDX, Address(EDX, VMHandles::kOffsetOfRawPtrInHandle));
// Load number of arguments into EBX.
__ movl(EBX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ SmiUntag(EBX);
// Set up arguments for the dart call.
Label push_arguments;
Label done_push_arguments;
__ testl(EBX, EBX); // check if there are arguments.
__ j(ZERO, &done_push_arguments, Assembler::kNearJump);
__ movl(EAX, Immediate(0));
// Compute address of 'arguments array' data area into EDI.
__ movl(EDI, Address(EBP, kArgumentsOffset));
__ movl(EDI, Address(EDI, VMHandles::kOffsetOfRawPtrInHandle));
__ leal(EDI, FieldAddress(EDI, Array::data_offset()));
__ Bind(&push_arguments);
__ movl(ECX, Address(EDI, EAX, TIMES_4, 0));
__ pushl(ECX);
__ incl(EAX);
__ cmpl(EAX, EBX);
__ j(LESS, &push_arguments, Assembler::kNearJump);
__ Bind(&done_push_arguments);
// Call the dart code entrypoint.
__ call(Address(EBP, kEntryPointOffset));
// Reread the Context pointer.
__ movl(CTX, Address(EBP, kNewContextOffset));
__ movl(CTX, Address(CTX, VMHandles::kOffsetOfRawPtrInHandle));
// Reread the arguments descriptor array to obtain the number of passed
// arguments.
__ movl(EDX, Address(EBP, kArgumentsDescOffset));
__ movl(EDX, Address(EDX, VMHandles::kOffsetOfRawPtrInHandle));
__ movl(EDX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
// Get rid of arguments pushed on the stack.
__ leal(ESP, Address(ESP, EDX, TIMES_2, 0)); // EDX is a Smi.
// Load Isolate pointer from Context structure into CTX. Drop Context.
__ movl(CTX, FieldAddress(CTX, Context::isolate_offset()));
// Restore the saved Context pointer into the Isolate structure.
// Uses ECX as a temporary register for this.
__ popl(ECX);
__ movl(Address(CTX, Isolate::top_context_offset()), ECX);
// Restore the saved top exit frame info back into the Isolate structure.
// Uses EDX as a temporary register for this.
__ popl(EDX);
__ movl(Address(CTX, Isolate::top_exit_frame_info_offset()), EDX);
// Restore C++ ABI callee-saved registers.
__ popl(EDI);
__ popl(ESI);
__ popl(EBX);
// Restore the frame pointer.
__ LeaveFrame();
__ ret();
}
// Called for inline allocation of contexts.
// Input:
// EDX: number of context variables.
// Output:
// EAX: new allocated RawContext object.
// EBX and EDX are destroyed.
void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
if (FLAG_inline_alloc) {
const Class& context_class = Class::ZoneHandle(Object::context_class());
Label slow_case;
Heap* heap = Isolate::Current()->heap();
// First compute the rounded instance size.
// EDX: number of context variables.
intptr_t fixed_size = (sizeof(RawContext) + kObjectAlignment - 1);
__ leal(EBX, Address(EDX, TIMES_4, fixed_size));
__ andl(EBX, Immediate(-kObjectAlignment));
// Now allocate the object.
// EDX: number of context variables.
__ movl(EAX, Address::Absolute(heap->TopAddress()));
__ addl(EBX, EAX);
// Check if the allocation fits into the remaining space.
// EAX: potential new object.
// EBX: potential next object start.
// EDX: number of context variables.
__ cmpl(EBX, Address::Absolute(heap->EndAddress()));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(ABOVE_EQUAL, &slow_case, Assembler::kNearJump);
}
// Successfully allocated the object, now update top to point to
// next object start and initialize the object.
// EAX: new object.
// EBX: next object start.
// EDX: number of context variables.
__ movl(Address::Absolute(heap->TopAddress()), EBX);
__ addl(EAX, Immediate(kHeapObjectTag));
// Calculate the size tag.
// EAX: new object.
// EDX: number of context variables.
{
Label size_tag_overflow, done;
__ leal(EBX, Address(EDX, TIMES_4, fixed_size));
__ andl(EBX, Immediate(-kObjectAlignment));
__ cmpl(EBX, Immediate(RawObject::SizeTag::kMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
__ shll(EBX, Immediate(RawObject::kSizeTagBit - kObjectAlignmentLog2));
__ jmp(&done);
__ Bind(&size_tag_overflow);
// Set overflow size tag value.
__ movl(EBX, Immediate(0));
__ Bind(&done);
// EAX: new object.
// EDX: number of context variables.
// EBX: size and bit tags.
__ orl(EBX,
Immediate(RawObject::ClassIdTag::encode(context_class.id())));
__ movl(FieldAddress(EAX, Context::tags_offset()), EBX); // Tags.
}
// Setup up number of context variables field.
// EAX: new object.
// EDX: number of context variables as integer value (not object).
__ movl(FieldAddress(EAX, Context::num_variables_offset()), EDX);
// Setup isolate field.
// Load Isolate pointer from Context structure into EBX.
// EAX: new object.
// EDX: number of context variables.
__ movl(EBX, FieldAddress(CTX, Context::isolate_offset()));
// EBX: Isolate, not an object.
__ movl(FieldAddress(EAX, Context::isolate_offset()), EBX);
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Setup the parent field.
// EAX: new object.
// EDX: number of context variables.
__ movl(FieldAddress(EAX, Context::parent_offset()), raw_null);
// Initialize the context variables.
// EAX: new object.
// EDX: number of context variables.
{
Label loop, entry;
__ leal(EBX, FieldAddress(EAX, Context::variable_offset(0)));
__ jmp(&entry, Assembler::kNearJump);
__ Bind(&loop);
__ decl(EDX);
__ movl(Address(EBX, EDX, TIMES_4, 0), raw_null);
__ Bind(&entry);
__ cmpl(EDX, Immediate(0));
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
}
// Done allocating and initializing the context.
// EAX: new object.
__ ret();
__ Bind(&slow_case);
}
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ SmiTag(EDX);
__ pushl(EDX);
__ CallRuntime(kAllocateContextRuntimeEntry, 1); // Allocate context.
__ popl(EAX); // Pop number of context variables argument.
__ popl(EAX); // Pop the new context object.
// EAX: new object
// Restore the frame pointer.
__ LeaveFrame();
__ ret();
}
DECLARE_LEAF_RUNTIME_ENTRY(void, StoreBufferBlockProcess, Isolate* isolate);
// Helper stub to implement Assembler::StoreIntoObject.
// Input parameters:
// EAX: Address being stored
void StubCode::GenerateUpdateStoreBufferStub(Assembler* assembler) {
// Save values being destroyed.
__ pushl(EDX);
__ pushl(ECX);
Label add_to_buffer;
// Check whether this object has already been remembered. Skip adding to the
// store buffer if the object is in the store buffer already.
// Spilled: EDX, ECX
// EAX: Address being stored
__ movl(ECX, FieldAddress(EAX, Object::tags_offset()));
__ testl(ECX, Immediate(1 << RawObject::kRememberedBit));
__ j(EQUAL, &add_to_buffer, Assembler::kNearJump);
__ popl(ECX);
__ popl(EDX);
__ ret();
__ Bind(&add_to_buffer);
__ orl(ECX, Immediate(1 << RawObject::kRememberedBit));
__ movl(FieldAddress(EAX, Object::tags_offset()), ECX);
// Load the isolate out of the context.
// Spilled: EDX, ECX
// EAX: Address being stored
__ movl(EDX, FieldAddress(CTX, Context::isolate_offset()));
// Load the StoreBuffer block out of the isolate. Then load top_ out of the
// StoreBufferBlock and add the address to the pointers_.
// Spilled: EDX, ECX
// EAX: Address being stored
// EDX: Isolate
__ movl(EDX, Address(EDX, Isolate::store_buffer_offset()));
__ movl(ECX, Address(EDX, StoreBufferBlock::top_offset()));
__ movl(Address(EDX, ECX, TIMES_4, StoreBufferBlock::pointers_offset()), EAX);
// Increment top_ and check for overflow.
// Spilled: EDX, ECX
// ECX: top_
// EDX: StoreBufferBlock
Label L;
__ incl(ECX);
__ movl(Address(EDX, StoreBufferBlock::top_offset()), ECX);
__ cmpl(ECX, Immediate(StoreBufferBlock::kSize));
// Restore values.
// Spilled: EDX, ECX
__ popl(ECX);
__ popl(EDX);
__ j(EQUAL, &L, Assembler::kNearJump);
__ ret();
// Handle overflow: Call the runtime leaf function.
__ Bind(&L);
// Setup frame, push callee-saved registers.
__ EnterCallRuntimeFrame(1 * kWordSize);
__ movl(EAX, FieldAddress(CTX, Context::isolate_offset()));
__ movl(Address(ESP, 0), EAX); // Push the isolate as the only argument.
__ CallRuntime(kStoreBufferBlockProcessRuntimeEntry, 1);
// Restore callee-saved registers, tear down frame.
__ LeaveCallRuntimeFrame();
__ ret();
}
// Called for inline allocation of objects.
// Input parameters:
// ESP + 8 : type arguments object (only if class is parameterized).
// ESP + 4 : type arguments of instantiator (only if class is parameterized).
// ESP : points to return address.
// Uses EAX, EBX, ECX, EDX, EDI as temporary registers.
void StubCode::GenerateAllocationStubForClass(Assembler* assembler,
const Class& cls) {
const intptr_t kObjectTypeArgumentsOffset = 2 * kWordSize;
const intptr_t kInstantiatorTypeArgumentsOffset = 1 * kWordSize;
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// The generated code is different if the class is parameterized.
const bool is_cls_parameterized = cls.HasTypeArguments();
ASSERT(!cls.HasTypeArguments() ||
(cls.type_arguments_field_offset() != Class::kNoTypeArguments));
// kInlineInstanceSize is a constant used as a threshold for determining
// when the object initialization should be done as a loop or as
// straight line code.
const int kInlineInstanceSize = 12;
const intptr_t instance_size = cls.instance_size();
ASSERT(instance_size > 0);
const intptr_t type_args_size = InstantiatedTypeArguments::InstanceSize();
if (FLAG_inline_alloc &&
Heap::IsAllocatableInNewSpace(instance_size + type_args_size)) {
Label slow_case;
Heap* heap = Isolate::Current()->heap();
__ movl(EAX, Address::Absolute(heap->TopAddress()));
__ leal(EBX, Address(EAX, instance_size));
if (is_cls_parameterized) {
__ movl(ECX, EBX);
// A new InstantiatedTypeArguments object only needs to be allocated if
// the instantiator is provided (not kNoInstantiator, but may be null).
Label no_instantiator;
__ cmpl(Address(ESP, kInstantiatorTypeArgumentsOffset),
Immediate(Smi::RawValue(StubCode::kNoInstantiator)));
__ j(EQUAL, &no_instantiator, Assembler::kNearJump);
__ addl(EBX, Immediate(type_args_size));
__ Bind(&no_instantiator);
// ECX: potential new object end and, if ECX != EBX, potential new
// InstantiatedTypeArguments object start.
}
// Check if the allocation fits into the remaining space.
// EAX: potential new object start.
// EBX: potential next object start.
__ cmpl(EBX, Address::Absolute(heap->EndAddress()));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(ABOVE_EQUAL, &slow_case, Assembler::kNearJump);
}
// Successfully allocated the object(s), now update top to point to
// next object start and initialize the object.
__ movl(Address::Absolute(heap->TopAddress()), EBX);
if (is_cls_parameterized) {
// Initialize the type arguments field in the object.
// EAX: new object start.
// ECX: potential new object end and, if ECX != EBX, potential new
// InstantiatedTypeArguments object start.
// EBX: next object start.
Label type_arguments_ready;
__ movl(EDI, Address(ESP, kObjectTypeArgumentsOffset));
__ cmpl(ECX, EBX);
__ j(EQUAL, &type_arguments_ready, Assembler::kNearJump);
// Initialize InstantiatedTypeArguments object at ECX.
__ movl(Address(ECX,
InstantiatedTypeArguments::uninstantiated_type_arguments_offset()),
EDI);
__ movl(EDX, Address(ESP, kInstantiatorTypeArgumentsOffset));
__ movl(Address(ECX,
InstantiatedTypeArguments::instantiator_type_arguments_offset()),
EDX);
const Class& ita_cls =
Class::ZoneHandle(Object::instantiated_type_arguments_class());
// Set the tags.
uword tags = 0;
tags = RawObject::SizeTag::update(type_args_size, tags);
tags = RawObject::ClassIdTag::update(ita_cls.id(), tags);
__ movl(Address(ECX, Instance::tags_offset()), Immediate(tags));
// Set the new InstantiatedTypeArguments object (ECX) as the type
// arguments (EDI) of the new object (EAX).
__ movl(EDI, ECX);
__ addl(EDI, Immediate(kHeapObjectTag));
// Set EBX to new object end.
__ movl(EBX, ECX);
__ Bind(&type_arguments_ready);
// EAX: new object.
// EDI: new object type arguments.
}
// EAX: new object start.
// EBX: next object start.
// EDI: new object type arguments (if is_cls_parameterized).
// Set the tags.
uword tags = 0;
tags = RawObject::SizeTag::update(instance_size, tags);
ASSERT(cls.id() != kIllegalCid);
tags = RawObject::ClassIdTag::update(cls.id(), tags);
__ movl(Address(EAX, Instance::tags_offset()), Immediate(tags));
// Initialize the remaining words of the object.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// EAX: new object start.
// EBX: next object start.
// EDI: new object type arguments (if is_cls_parameterized).
// First try inlining the initialization without a loop.
if (instance_size < (kInlineInstanceSize * kWordSize)) {
// Check if the object contains any non-header fields.
// Small objects are initialized using a consecutive set of writes.
for (intptr_t current_offset = sizeof(RawObject);
current_offset < instance_size;
current_offset += kWordSize) {
__ movl(Address(EAX, current_offset), raw_null);
}
} else {
__ leal(ECX, Address(EAX, sizeof(RawObject)));
// Loop until the whole object is initialized.
// EAX: new object.
// EBX: next object start.
// ECX: next word to be initialized.
// EDI: new object type arguments (if is_cls_parameterized).
Label init_loop;
Label done;
__ Bind(&init_loop);
__ cmpl(ECX, EBX);
__ j(ABOVE_EQUAL, &done, Assembler::kNearJump);
__ movl(Address(ECX, 0), raw_null);
__ addl(ECX, Immediate(kWordSize));
__ jmp(&init_loop, Assembler::kNearJump);
__ Bind(&done);
}
if (is_cls_parameterized) {
// EDI: new object type arguments.
// Set the type arguments in the new object.
__ movl(Address(EAX, cls.type_arguments_field_offset()), EDI);
}
// Done allocating and initializing the instance.
// EAX: new object.
__ addl(EAX, Immediate(kHeapObjectTag));
__ ret();
__ Bind(&slow_case);
}
if (is_cls_parameterized) {
__ movl(EAX, Address(ESP, kObjectTypeArgumentsOffset));
__ movl(EDX, Address(ESP, kInstantiatorTypeArgumentsOffset));
}
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ PushObject(cls); // Push class of object to be allocated.
if (is_cls_parameterized) {
__ pushl(EAX); // Push type arguments of object to be allocated.
__ pushl(EDX); // Push type arguments of instantiator.
} else {
__ pushl(raw_null); // Push null type arguments.
__ pushl(Immediate(Smi::RawValue(StubCode::kNoInstantiator)));
}
__ CallRuntime(kAllocateObjectRuntimeEntry, 3); // Allocate object.
__ popl(EAX); // Pop argument (instantiator).
__ popl(EAX); // Pop argument (type arguments of object).
__ popl(EAX); // Pop argument (class of object).
__ popl(EAX); // Pop result (newly allocated object).
// EAX: new object
// Restore the frame pointer.
__ LeaveFrame();
__ ret();
}
// Called for inline allocation of closures.
// Input parameters:
// ESP + 8 : receiver (null if not an implicit instance closure).
// ESP + 4 : type arguments object (null if class is no parameterized).
// ESP : points to return address.
// Uses EAX, EBX, ECX, EDX as temporary registers.
void StubCode::GenerateAllocationStubForClosure(Assembler* assembler,
const Function& func) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
ASSERT(func.IsClosureFunction());
ASSERT(!func.IsImplicitStaticClosureFunction());
const bool is_implicit_instance_closure =
func.IsImplicitInstanceClosureFunction();
const Class& cls = Class::ZoneHandle(func.signature_class());
const bool has_type_arguments = cls.HasTypeArguments();
const intptr_t kTypeArgumentsOffset = 1 * kWordSize;
const intptr_t kReceiverOffset = 2 * kWordSize;
const intptr_t closure_size = Closure::InstanceSize();
const intptr_t context_size = Context::InstanceSize(1); // Captured receiver.
if (FLAG_inline_alloc &&
Heap::IsAllocatableInNewSpace(closure_size + context_size)) {
Label slow_case;
Heap* heap = Isolate::Current()->heap();
__ movl(EAX, Address::Absolute(heap->TopAddress()));
__ leal(EBX, Address(EAX, closure_size));
if (is_implicit_instance_closure) {
__ movl(ECX, EBX); // ECX: new context address.
__ addl(EBX, Immediate(context_size));
}
// Check if the allocation fits into the remaining space.
// EAX: potential new closure object.
// ECX: potential new context object (only if is_implicit_closure).
// EBX: potential next object start.
__ cmpl(EBX, Address::Absolute(heap->EndAddress()));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(ABOVE_EQUAL, &slow_case, Assembler::kNearJump);
}
// Successfully allocated the object, now update top to point to
// next object start and initialize the object.
__ movl(Address::Absolute(heap->TopAddress()), EBX);
// EAX: new closure object.
// ECX: new context object (only if is_implicit_closure).
// Set the tags.
uword tags = 0;
tags = RawObject::SizeTag::update(closure_size, tags);
tags = RawObject::ClassIdTag::update(cls.id(), tags);
__ movl(Address(EAX, Instance::tags_offset()), Immediate(tags));
// Initialize the function field in the object.
// EAX: new closure object.
// ECX: new context object (only if is_implicit_closure).
// EBX: next object start.
__ LoadObject(EDX, func); // Load function of closure to be allocated.
__ movl(Address(EAX, Closure::function_offset()), EDX);
// Setup the context for this closure.
if (is_implicit_instance_closure) {
// Initialize the new context capturing the receiver.
const Class& context_class = Class::ZoneHandle(Object::context_class());
// Set the tags.
uword tags = 0;
tags = RawObject::SizeTag::update(context_size, tags);
tags = RawObject::ClassIdTag::update(context_class.id(), tags);
__ movl(Address(ECX, Context::tags_offset()), Immediate(tags));
// Set number of variables field to 1 (for captured receiver).
__ movl(Address(ECX, Context::num_variables_offset()), Immediate(1));
// Set isolate field to isolate of current context.
__ movl(EDX, FieldAddress(CTX, Context::isolate_offset()));
__ movl(Address(ECX, Context::isolate_offset()), EDX);
// Set the parent to null.
__ movl(Address(ECX, Context::parent_offset()), raw_null);
// Initialize the context variable to the receiver.
__ movl(EDX, Address(ESP, kReceiverOffset));
__ movl(Address(ECX, Context::variable_offset(0)), EDX);
// Set the newly allocated context in the newly allocated closure.
__ addl(ECX, Immediate(kHeapObjectTag));
__ movl(Address(EAX, Closure::context_offset()), ECX);
} else {
__ movl(Address(EAX, Closure::context_offset()), CTX);
}
// Set the type arguments field in the newly allocated closure.
__ movl(EDX, Address(ESP, kTypeArgumentsOffset));
__ movl(Address(EAX, Closure::type_arguments_offset()), EDX);
// Done allocating and initializing the instance.
// EAX: new object.
__ addl(EAX, Immediate(kHeapObjectTag));
__ ret();
__ Bind(&slow_case);
}
if (has_type_arguments) {
__ movl(ECX, Address(ESP, kTypeArgumentsOffset));
}
if (is_implicit_instance_closure) {
__ movl(EAX, Address(ESP, kReceiverOffset));
}
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(raw_null); // Setup space on stack for return value.
__ PushObject(func);
if (is_implicit_instance_closure) {
__ pushl(EAX); // Receiver.
}
if (has_type_arguments) {
__ pushl(ECX); // Push type arguments of closure to be allocated.
} else {
__ pushl(raw_null); // Push null type arguments.
}
if (is_implicit_instance_closure) {
__ CallRuntime(kAllocateImplicitInstanceClosureRuntimeEntry, 3);
__ popl(EAX); // Pop argument (type arguments of object).
__ popl(EAX); // Pop receiver.
} else {
ASSERT(func.IsNonImplicitClosureFunction());
__ CallRuntime(kAllocateClosureRuntimeEntry, 2);
__ popl(EAX); // Pop argument (type arguments of object).
}
__ popl(EAX); // Pop function object.
__ popl(EAX);
// EAX: new object
// Restore the frame pointer.
__ LeaveFrame();
__ ret();
}
// Called for invoking "dynamic noSuchMethod(Invocation invocation)" function
// from the entry code of a dart function after an error in passed argument
// name or number is detected.
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of last argument.
// ECX : ic-data.
// EDX : arguments descriptor array.
// Uses EAX, EBX, EDI as temporary registers.
void StubCode::GenerateCallNoSuchMethodFunctionStub(Assembler* assembler) {
__ EnterStubFrame();
// Load the receiver.
__ movl(EDI, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EAX, Address(EBP, EDI, TIMES_2, kParamEndSlotFromFp * kWordSize));
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ pushl(raw_null); // Setup space on stack for result from noSuchMethod.
__ pushl(EAX); // Receiver.
__ pushl(ECX); // IC data array.
__ pushl(EDX); // Arguments descriptor array.
__ movl(EDX, EDI);
// EDX: Smi-tagged arguments array length.
PushArgumentsArray(assembler);
__ CallRuntime(kInvokeNoSuchMethodFunctionRuntimeEntry, 4);
// Remove arguments.
__ Drop(4);
__ popl(EAX); // Get result into EAX.
// Remove the stub frame as we are about to return.
__ LeaveFrame();
__ ret();
}
// Cannot use function object from ICData as it may be the inlined
// function and not the top-scope function.
void StubCode::GenerateOptimizedUsageCounterIncrement(Assembler* assembler) {
Register ic_reg = ECX;
Register func_reg = EDI;
if (FLAG_trace_optimized_ic_calls) {
__ EnterStubFrame();
__ pushl(func_reg); // Preserve
__ pushl(ic_reg); // Preserve.
__ pushl(ic_reg); // Argument.
__ pushl(func_reg); // Argument.
__ CallRuntime(kTraceICCallRuntimeEntry, 2);
__ popl(EAX); // Discard argument;
__ popl(EAX); // Discard argument;
__ popl(ic_reg); // Restore.
__ popl(func_reg); // Restore.
__ LeaveFrame();
}
__ incl(FieldAddress(func_reg, Function::usage_counter_offset()));
}
// Loads function into 'temp_reg'.
void StubCode::GenerateUsageCounterIncrement(Assembler* assembler,
Register temp_reg) {
Register ic_reg = ECX;
Register func_reg = temp_reg;
ASSERT(ic_reg != func_reg);
__ movl(func_reg, FieldAddress(ic_reg, ICData::function_offset()));
__ incl(FieldAddress(func_reg, Function::usage_counter_offset()));
}
// Generate inline cache check for 'num_args'.
// ECX: Inline cache data object.
// TOS(0): return address
// Control flow:
// - If receiver is null -> jump to IC miss.
// - If receiver is Smi -> load Smi class.
// - If receiver is not-Smi -> load receiver's class.
// - Check if 'num_args' (including receiver) match any IC data group.
// - Match found -> jump to target.
// - Match not found -> jump to IC miss.
void StubCode::GenerateNArgsCheckInlineCacheStub(
Assembler* assembler,
intptr_t num_args,
const RuntimeEntry& handle_ic_miss) {
ASSERT(num_args > 0);
#if defined(DEBUG)
{ Label ok;
// Check that the IC data array has NumberOfArgumentsChecked() == num_args.
// 'num_args_tested' is stored as an untagged int.
__ movl(EBX, FieldAddress(ECX, ICData::num_args_tested_offset()));
__ cmpl(EBX, Immediate(num_args));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Incorrect stub for IC data");
__ Bind(&ok);
}
#endif // DEBUG
// Check single stepping.
Label not_stepping;
__ movl(EAX, FieldAddress(CTX, Context::isolate_offset()));
__ movzxb(EAX, Address(EAX, Isolate::single_step_offset()));
__ cmpl(EAX, Immediate(0));
__ j(EQUAL, &not_stepping, Assembler::kNearJump);
__ EnterStubFrame();
__ pushl(ECX);
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ popl(ECX);
__ LeaveFrame();
__ Bind(&not_stepping);
// ECX: IC data object (preserved).
// Load arguments descriptor into EDX.
__ movl(EDX, FieldAddress(ECX, ICData::arguments_descriptor_offset()));
// Loop that checks if there is an IC data match.
Label loop, update, test, found, get_class_id_as_smi;
// ECX: IC data object (preserved).
__ movl(EBX, FieldAddress(ECX, ICData::ic_data_offset()));
// EBX: ic_data_array with check entries: classes and target functions.
__ leal(EBX, FieldAddress(EBX, Array::data_offset()));
// EBX: points directly to the first ic data array element.
// Get the receiver's class ID (first read number of arguments from
// arguments descriptor array and then access the receiver from the stack).
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, 0)); // EAX (argument_count) is smi.
__ call(&get_class_id_as_smi);
// EAX: receiver's class ID (smi).
__ movl(EDI, Address(EBX, 0)); // First class id (smi) to check.
__ jmp(&test);
__ Bind(&loop);
for (int i = 0; i < num_args; i++) {
if (i > 0) {
// If not the first, load the next argument's class ID.
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, - i * kWordSize));
__ call(&get_class_id_as_smi);
// EAX: next argument class ID (smi).
__ movl(EDI, Address(EBX, i * kWordSize));
// EDI: next class ID to check (smi).
}
__ cmpl(EAX, EDI); // Class id match?
if (i < (num_args - 1)) {
__ j(NOT_EQUAL, &update); // Continue.
} else {
// Last check, all checks before matched.
__ j(EQUAL, &found, Assembler::kNearJump); // Break.
}
}
__ Bind(&update);
// Reload receiver class ID. It has not been destroyed when num_args == 1.
if (num_args > 1) {
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, 0));
__ call(&get_class_id_as_smi);
}
const intptr_t entry_size = ICData::TestEntryLengthFor(num_args) * kWordSize;
__ addl(EBX, Immediate(entry_size)); // Next entry.
__ movl(EDI, Address(EBX, 0)); // Next class ID.
__ Bind(&test);
__ cmpl(EDI, Immediate(Smi::RawValue(kIllegalCid))); // Done?
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
// IC miss.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Compute address of arguments (first read number of arguments from
// arguments descriptor array and then compute address on the stack).
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ leal(EAX, Address(ESP, EAX, TIMES_2, 0)); // EAX is Smi.
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve IC data object.
__ pushl(raw_null); // Setup space on stack for result (target code object).
// Push call arguments.
for (intptr_t i = 0; i < num_args; i++) {
__ movl(EBX, Address(EAX, -kWordSize * i));
__ pushl(EBX);
}
__ pushl(ECX); // Pass IC data object.
__ CallRuntime(handle_ic_miss, num_args + 1);
// Remove the call arguments pushed earlier, including the IC data object.
for (intptr_t i = 0; i < num_args + 1; i++) {
__ popl(EAX);
}
__ popl(EAX); // Pop returned code object into EAX (null if not found).
__ popl(ECX); // Restore IC data array.
__ popl(EDX); // Restore arguments descriptor array.
__ LeaveFrame();
Label call_target_function;
__ cmpl(EAX, raw_null);
__ j(NOT_EQUAL, &call_target_function, Assembler::kNearJump);
// NoSuchMethod or closure.
// Mark IC call that it may be a closure call that does not collect
// type feedback.
__ movb(FieldAddress(ECX, ICData::is_closure_call_offset()), Immediate(1));
__ jmp(&StubCode::InstanceFunctionLookupLabel());
__ Bind(&found);
// EBX: Pointer to an IC data check group.
const intptr_t target_offset = ICData::TargetIndexFor(num_args) * kWordSize;
const intptr_t count_offset = ICData::CountIndexFor(num_args) * kWordSize;
__ movl(EAX, Address(EBX, target_offset));
__ addl(Address(EBX, count_offset), Immediate(Smi::RawValue(1)));
__ j(NO_OVERFLOW, &call_target_function, Assembler::kNearJump);
__ movl(Address(EBX, count_offset),
Immediate(Smi::RawValue(Smi::kMaxValue)));
__ Bind(&call_target_function);
// EAX: Target function.
__ movl(EAX, FieldAddress(EAX, Function::code_offset()));
__ movl(EAX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(EAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(EAX);
// Instance in EAX, return its class-id in EAX as Smi.
__ Bind(&get_class_id_as_smi);
Label not_smi;
// Test if Smi -> load Smi class for comparison.
__ testl(EAX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, &not_smi, Assembler::kNearJump);
__ movl(EAX, Immediate(Smi::RawValue(kSmiCid)));
__ ret();
__ Bind(&not_smi);
__ LoadClassId(EAX, EAX);
__ SmiTag(EAX);
__ ret();
}
// Use inline cache data array to invoke the target or continue in inline
// cache miss handler. Stub for 1-argument check (receiver class).
// ECX: Inline cache data object.
// TOS(0): Return address.
// Inline cache data object structure:
// 0: function-name
// 1: N, number of arguments checked.
// 2 .. (length - 1): group of checks, each check containing:
// - N classes.
// - 1 target function.
void StubCode::GenerateOneArgCheckInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry);
}
void StubCode::GenerateTwoArgsCheckInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry);
}
void StubCode::GenerateThreeArgsCheckInlineCacheStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(
assembler, 3, kInlineCacheMissHandlerThreeArgsRuntimeEntry);
}
// Use inline cache data array to invoke the target or continue in inline
// cache miss handler. Stub for 1-argument check (receiver class).
// EDI: function which counter needs to be incremented.
// ECX: Inline cache data object.
// TOS(0): Return address.
// Inline cache data object structure:
// 0: function-name
// 1: N, number of arguments checked.
// 2 .. (length - 1): group of checks, each check containing:
// - N classes.
// - 1 target function.
void StubCode::GenerateOneArgOptimizedCheckInlineCacheStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry);
}
void StubCode::GenerateTwoArgsOptimizedCheckInlineCacheStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry);
}
void StubCode::GenerateThreeArgsOptimizedCheckInlineCacheStub(
Assembler* assembler) {
GenerateOptimizedUsageCounterIncrement(assembler);
GenerateNArgsCheckInlineCacheStub(
assembler, 3, kInlineCacheMissHandlerThreeArgsRuntimeEntry);
}
// Do not count as no type feedback is collected.
void StubCode::GenerateClosureCallInlineCacheStub(Assembler* assembler) {
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry);
}
// Megamorphic call is currently implemented as IC call but through a stub
// that does not check/count function invocations.
void StubCode::GenerateMegamorphicCallStub(Assembler* assembler) {
GenerateNArgsCheckInlineCacheStub(
assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry);
}
// Intermediary stub between a static call and its target. ICData contains
// the target function and the call count.
// ECX: ICData
void StubCode::GenerateZeroArgsUnoptimizedStaticCallStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
#if defined(DEBUG)
{ Label ok;
// Check that the IC data array has NumberOfArgumentsChecked() == num_args.
// 'num_args_tested' is stored as an untagged int.
__ movl(EBX, FieldAddress(ECX, ICData::num_args_tested_offset()));
__ cmpl(EBX, Immediate(0));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Incorrect IC data for unoptimized static call");
__ Bind(&ok);
}
#endif // DEBUG
// Check single stepping.
Label not_stepping;
__ movl(EAX, FieldAddress(CTX, Context::isolate_offset()));
__ movzxb(EAX, Address(EAX, Isolate::single_step_offset()));
__ cmpl(EAX, Immediate(0));
__ j(EQUAL, &not_stepping, Assembler::kNearJump);
__ EnterStubFrame();
__ pushl(ECX);
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ popl(ECX);
__ LeaveFrame();
__ Bind(&not_stepping);
// ECX: IC data object (preserved).
__ movl(EBX, FieldAddress(ECX, ICData::ic_data_offset()));
// EBX: ic_data_array with entries: target functions and count.
__ leal(EBX, FieldAddress(EBX, Array::data_offset()));
// EBX: points directly to the first ic data array element.
const intptr_t target_offset = ICData::TargetIndexFor(0) * kWordSize;
const intptr_t count_offset = ICData::CountIndexFor(0) * kWordSize;
// Increment count for this call.
Label increment_done;
__ addl(Address(EBX, count_offset), Immediate(Smi::RawValue(1)));
__ j(NO_OVERFLOW, &increment_done, Assembler::kNearJump);
__ movl(Address(EBX, count_offset), Immediate(Smi::RawValue(Smi::kMaxValue)));
__ Bind(&increment_done);
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label target_is_compiled;
// Get function and call it, if possible.
__ movl(EDI, Address(EBX, target_offset));
__ movl(EAX, FieldAddress(EDI, Function::code_offset()));
__ cmpl(EAX, raw_null);
__ j(NOT_EQUAL, &target_is_compiled, Assembler::kNearJump);
__ EnterStubFrame();
__ pushl(EDI); // Preserve target function.
__ pushl(ECX); // Preserve IC data object.
__ pushl(EDI); // Pass function.
__ CallRuntime(kCompileFunctionRuntimeEntry, 1);
__ popl(EAX); // Discard argument.
__ popl(ECX); // Restore IC data object.
__ popl(EDI); // Restore target function.
__ LeaveFrame();
__ movl(EAX, FieldAddress(EDI, Function::code_offset()));
__ Bind(&target_is_compiled);
// EAX: Target code.
__ movl(EAX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(EAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
// Load arguments descriptor into EDX.
__ movl(EDX, FieldAddress(ECX, ICData::arguments_descriptor_offset()));
__ jmp(EAX);
}
void StubCode::GenerateTwoArgsUnoptimizedStaticCallStub(Assembler* assembler) {
GenerateUsageCounterIncrement(assembler, EBX);
GenerateNArgsCheckInlineCacheStub(
assembler, 2, kStaticCallMissHandlerTwoArgsRuntimeEntry);
}
// EDX, ECX: May contain arguments to runtime stub.
void StubCode::GenerateBreakpointRuntimeStub(Assembler* assembler) {
__ EnterStubFrame();
// Save runtime args.
__ pushl(ECX);
__ pushl(EDX);
// Room for result. Debugger stub returns address of the
// unpatched runtime stub.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ pushl(raw_null); // Room for result.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ popl(EAX); // Address of original stub.
__ popl(EDX); // Restore arguments.
__ popl(ECX);
__ LeaveFrame();
__ jmp(EAX); // Jump to original stub.
}
// ECX: ICData (unoptimized static call).
// TOS(0): return address (Dart code).
void StubCode::GenerateBreakpointStaticStub(Assembler* assembler) {
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(ECX); // Preserve ICData for unoptimized call.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ pushl(raw_null); // Room for result.
__ CallRuntime(kBreakpointStaticHandlerRuntimeEntry, 0);
__ popl(EAX); // Code object.
__ popl(ECX); // Restore ICData.
__ LeaveFrame();
// Load arguments descriptor into EDX.
__ movl(EDX, FieldAddress(ECX, ICData::arguments_descriptor_offset()));
// Now call the static function. The breakpoint handler function
// ensures that the call target is compiled.
// Note that we can't just jump to the CallStatic function stub
// here since that stub would patch the call site with the
// static function address.
__ movl(ECX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(ECX);
}
// TOS(0): return address (Dart code).
void StubCode::GenerateBreakpointReturnStub(Assembler* assembler) {
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(EAX);
__ CallRuntime(kBreakpointReturnHandlerRuntimeEntry, 0);
__ popl(EAX);
__ LeaveFrame();
// Instead of returning to the patched Dart function, emulate the
// smashed return code pattern and return to the function's caller.
__ popl(ECX); // Discard return address to patched dart code.
// Execute function epilog code that was smashed in the Dart code.
__ LeaveFrame();
__ ret();
}
// ECX: Inline cache data array.
// TOS(0): return address (Dart code).
void StubCode::GenerateBreakpointDynamicStub(Assembler* assembler) {
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ pushl(ECX);
__ CallRuntime(kBreakpointDynamicHandlerRuntimeEntry, 0);
__ popl(ECX);
__ LeaveFrame();
// Find out which dispatch stub to call.
Label test_two, test_three, test_four;
__ movl(EBX, FieldAddress(ECX, ICData::num_args_tested_offset()));
__ cmpl(EBX, Immediate(1));
__ j(NOT_EQUAL, &test_two, Assembler::kNearJump);
__ jmp(&StubCode::OneArgCheckInlineCacheLabel());
__ Bind(&test_two);
__ cmpl(EBX, Immediate(2));
__ j(NOT_EQUAL, &test_three, Assembler::kNearJump);
__ jmp(&StubCode::TwoArgsCheckInlineCacheLabel());
__ Bind(&test_three);
__ cmpl(EBX, Immediate(3));
__ j(NOT_EQUAL, &test_four, Assembler::kNearJump);
__ jmp(&StubCode::ThreeArgsCheckInlineCacheLabel());
__ Bind(&test_four);
__ Stop("Unsupported number of arguments tested.");
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments (can be NULL).
// TOS + 2: instance.
// TOS + 3: SubtypeTestCache.
// Result in ECX: null -> not found, otherwise result (true or false).
static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
ASSERT((1 <= n) && (n <= 3));
const intptr_t kInstantiatorTypeArgumentsInBytes = 1 * kWordSize;
const intptr_t kInstanceOffsetInBytes = 2 * kWordSize;
const intptr_t kCacheOffsetInBytes = 3 * kWordSize;
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(EAX, Address(ESP, kInstanceOffsetInBytes));
if (n > 1) {
// Get instance type arguments.
__ LoadClass(ECX, EAX, EBX);
// Compute instance type arguments into EBX.
Label has_no_type_arguments;
__ movl(EBX, raw_null);
__ movl(EDI, FieldAddress(ECX,
Class::type_arguments_field_offset_in_words_offset()));
__ cmpl(EDI, Immediate(Class::kNoTypeArguments));
__ j(EQUAL, &has_no_type_arguments, Assembler::kNearJump);
__ movl(EBX, FieldAddress(EAX, EDI, TIMES_4, 0));
__ Bind(&has_no_type_arguments);
}
__ LoadClassId(ECX, EAX);
// EAX: instance, ECX: instance class id.
// EBX: instance type arguments (null if none), used only if n > 1.
__ movl(EDX, Address(ESP, kCacheOffsetInBytes));
// EDX: SubtypeTestCache.
__ movl(EDX, FieldAddress(EDX, SubtypeTestCache::cache_offset()));
__ addl(EDX, Immediate(Array::data_offset() - kHeapObjectTag));
Label loop, found, not_found, next_iteration;
// EDX: Entry start.
// ECX: instance class id.
// EBX: instance type arguments.
__ SmiTag(ECX);
__ Bind(&loop);
__ movl(EDI, Address(EDX, kWordSize * SubtypeTestCache::kInstanceClassId));
__ cmpl(EDI, raw_null);
__ j(EQUAL, &not_found, Assembler::kNearJump);
__ cmpl(EDI, ECX);
if (n == 1) {
__ j(EQUAL, &found, Assembler::kNearJump);
} else {
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ movl(EDI,
Address(EDX, kWordSize * SubtypeTestCache::kInstanceTypeArguments));
__ cmpl(EDI, EBX);
if (n == 2) {
__ j(EQUAL, &found, Assembler::kNearJump);
} else {
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ movl(EDI,
Address(EDX, kWordSize *
SubtypeTestCache::kInstantiatorTypeArguments));
__ cmpl(EDI, Address(ESP, kInstantiatorTypeArgumentsInBytes));
__ j(EQUAL, &found, Assembler::kNearJump);
}
}
__ Bind(&next_iteration);
__ addl(EDX, Immediate(kWordSize * SubtypeTestCache::kTestEntryLength));
__ jmp(&loop, Assembler::kNearJump);
// Fall through to not found.
__ Bind(&not_found);
__ movl(ECX, raw_null);
__ ret();
__ Bind(&found);
__ movl(ECX, Address(EDX, kWordSize * SubtypeTestCache::kTestResult));
__ ret();
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments or NULL.
// TOS + 2: instance.
// TOS + 3: cache array.
// Result in ECX: null -> not found, otherwise result (true or false).
void StubCode::GenerateSubtype1TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 1);
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments or NULL.
// TOS + 2: instance.
// TOS + 3: cache array.
// Result in ECX: null -> not found, otherwise result (true or false).
void StubCode::GenerateSubtype2TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 2);
}
// Used to check class and type arguments. Arguments passed on stack:
// TOS + 0: return address.
// TOS + 1: instantiator type arguments.
// TOS + 2: instance.
// TOS + 3: cache array.
// Result in ECX: null -> not found, otherwise result (true or false).
void StubCode::GenerateSubtype3TestCacheStub(Assembler* assembler) {
GenerateSubtypeNTestCacheStub(assembler, 3);
}
// Return the current stack pointer address, used to do stack alignment checks.
// TOS + 0: return address
// Result in EAX.
void StubCode::GenerateGetStackPointerStub(Assembler* assembler) {
__ leal(EAX, Address(ESP, kWordSize));
__ ret();
}
// Jump to the exception or error handler.
// TOS + 0: return address
// TOS + 1: program_counter
// TOS + 2: stack_pointer
// TOS + 3: frame_pointer
// TOS + 4: exception object
// TOS + 5: stacktrace object
// No Result.
void StubCode::GenerateJumpToExceptionHandlerStub(Assembler* assembler) {
ASSERT(kExceptionObjectReg == EAX);
ASSERT(kStackTraceObjectReg == EDX);
__ movl(kStackTraceObjectReg, Address(ESP, 5 * kWordSize));
__ movl(kExceptionObjectReg, Address(ESP, 4 * kWordSize));
__ movl(EBP, Address(ESP, 3 * kWordSize)); // Load target frame_pointer.
__ movl(EBX, Address(ESP, 1 * kWordSize)); // Load target PC into EBX.
__ movl(ESP, Address(ESP, 2 * kWordSize)); // Load target stack_pointer.
__ jmp(EBX); // Jump to the exception handler code.
}
// Calls to the runtime to optimize the given function.
// EDI: function to be reoptimized.
// EDX: argument descriptor (preserved).
void StubCode::GenerateOptimizeFunctionStub(Assembler* assembler) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ EnterStubFrame();
__ pushl(EDX);
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EDI);
__ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);
__ popl(EAX); // Discard argument.
__ popl(EAX); // Get Code object
__ popl(EDX); // Restore argument descriptor.
__ movl(EAX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(EAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ LeaveFrame();
__ jmp(EAX);
__ int3();
}
DECLARE_LEAF_RUNTIME_ENTRY(intptr_t,
BigintCompare,
RawBigint* left,
RawBigint* right);
// Does identical check (object references are equal or not equal) with special
// checks for boxed numbers.
// Return ZF set.
// Note: A Mint cannot contain a value that would fit in Smi, a Bigint
// cannot contain a value that fits in Mint or Smi.
void StubCode::GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
const Register left,
const Register right,
const Register temp,
const Register unused) {
Label reference_compare, done, check_mint, check_bigint;
// If any of the arguments is Smi do reference compare.
__ testl(left, Immediate(kSmiTagMask));
__ j(ZERO, &reference_compare, Assembler::kNearJump);
__ testl(right, Immediate(kSmiTagMask));
__ j(ZERO, &reference_compare, Assembler::kNearJump);
// Value compare for two doubles.
__ CompareClassId(left, kDoubleCid, temp);
__ j(NOT_EQUAL, &check_mint, Assembler::kNearJump);
__ CompareClassId(right, kDoubleCid, temp);
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
// Double values bitwise compare.
__ movl(temp, FieldAddress(left, Double::value_offset() + 0 * kWordSize));
__ cmpl(temp, FieldAddress(right, Double::value_offset() + 0 * kWordSize));
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ movl(temp, FieldAddress(left, Double::value_offset() + 1 * kWordSize));
__ cmpl(temp, FieldAddress(right, Double::value_offset() + 1 * kWordSize));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&check_mint);
__ CompareClassId(left, kMintCid, temp);
__ j(NOT_EQUAL, &check_bigint, Assembler::kNearJump);
__ CompareClassId(right, kMintCid, temp);
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ movl(temp, FieldAddress(left, Mint::value_offset() + 0 * kWordSize));
__ cmpl(temp, FieldAddress(right, Mint::value_offset() + 0 * kWordSize));
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ movl(temp, FieldAddress(left, Mint::value_offset() + 1 * kWordSize));
__ cmpl(temp, FieldAddress(right, Mint::value_offset() + 1 * kWordSize));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&check_bigint);
__ CompareClassId(left, kBigintCid, temp);
__ j(NOT_EQUAL, &reference_compare, Assembler::kNearJump);
__ CompareClassId(right, kBigintCid, temp);
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(2 * kWordSize);
__ movl(Address(ESP, 1 * kWordSize), left);
__ movl(Address(ESP, 0 * kWordSize), right);
__ CallRuntime(kBigintCompareRuntimeEntry, 2);
// Result in EAX, 0 means equal.
__ LeaveFrame();
__ cmpl(EAX, Immediate(0));
__ jmp(&done);
__ Bind(&reference_compare);
__ cmpl(left, right);
__ Bind(&done);
}
// Called only from unoptimized code. All relevant registers have been saved.
// TOS + 0: return address
// TOS + 1: right argument.
// TOS + 2: left argument.
// Returns ZF set.
void StubCode::GenerateUnoptimizedIdenticalWithNumberCheckStub(
Assembler* assembler) {
// Check single stepping.
Label not_stepping;
__ movl(EAX, FieldAddress(CTX, Context::isolate_offset()));
__ movzxb(EAX, Address(EAX, Isolate::single_step_offset()));
__ cmpl(EAX, Immediate(0));
__ j(EQUAL, &not_stepping, Assembler::kNearJump);
__ EnterStubFrame();
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ LeaveFrame();
__ Bind(&not_stepping);
const Register left = EAX;
const Register right = EDX;
const Register temp = ECX;
__ movl(left, Address(ESP, 2 * kWordSize));
__ movl(right, Address(ESP, 1 * kWordSize));
GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp);
__ ret();
}
// Called from otpimzied code only. Must preserve any registers that are
// destroyed.
// TOS + 0: return address
// TOS + 1: right argument.
// TOS + 2: left argument.
// Returns ZF set.
void StubCode::GenerateOptimizedIdenticalWithNumberCheckStub(
Assembler* assembler) {
const Register left = EAX;
const Register right = EDX;
const Register temp = ECX;
// Preserve left, right and temp.
__ pushl(left);
__ pushl(right);
__ pushl(temp);
__ movl(left, Address(ESP, 5 * kWordSize));
__ movl(right, Address(ESP, 4 * kWordSize));
GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp);
__ popl(temp);
__ popl(right);
__ popl(left);
__ ret();
}
} // namespace dart
#endif // defined TARGET_ARCH_IA32