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sdk/runtime/vm/stub_code_ia32.cc
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zra@google.com 039a4c4078 Disconnects code objects from infrequently used unoptimized functions. 
Every 30 seconds (configurable by --code-collection-interval),
before a MarkSweep collection, this change halves a function's
usage count if it is unoptimized. If the function's usage count
reaches 0 as a result of this halving, it sets the function's
code pointers to null. Then, if the code object isn't marked
during the MarkSweep, it will be collected.

This change also checks for null code pointers in various
places, and recompiles/reconnects code if needed.

R=srdjan@google.com

Review URL: https://codereview.chromium.org//27802002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29209 260f80e4-7a28-3924-810f-c04153c831b5
2013-10-24 21:26:15 +00:00

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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h"
#if defined(TARGET_ARCH_IA32)
#include "vm/assembler.h"
#include "vm/compiler.h"
#include "vm/dart_entry.h"
#include "vm/flow_graph_compiler.h"
#include "vm/instructions.h"
#include "vm/heap.h"
#include "vm/object_store.h"
#include "vm/resolver.h"
#include "vm/scavenger.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
#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 intptr_t kEntryPointOffset = 2 * kWordSize;
const intptr_t kArgumentsDescOffset = 3 * kWordSize;
const intptr_t kArgumentsOffset = 4 * kWordSize;
const intptr_t 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.NumTypeArguments() > 0;
ASSERT(!is_cls_parameterized ||
(cls.type_arguments_field_offset() != Class::kNoTypeArguments));
// kInlineInstanceSize is a constant used as a threshold for determining
// when the object initialization should be done as a loop or as
// straight line code.
const int kInlineInstanceSize = 12;
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.NumTypeArguments() > 0;
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.
Label is_compiled;
__ movl(EBX, FieldAddress(EAX, Function::code_offset()));
if (FLAG_collect_code) {
// If code might be GC'd, then EBX might be null. If it is, recompile.
__ cmpl(EBX, raw_null);
__ j(NOT_EQUAL, &is_compiled, Assembler::kNearJump);
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve IC data object.
__ pushl(EAX); // Pass function.
__ CallRuntime(kCompileFunctionRuntimeEntry, 1);
__ popl(EAX); // Restore function.
__ popl(ECX); // Restore IC data array.
__ popl(EDX); // Restore arguments descriptor array.
__ LeaveFrame();
__ movl(EBX, FieldAddress(EAX, Function::code_offset()));
__ Bind(&is_compiled);
}
__ movl(EAX, FieldAddress(EBX, 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);
}
// Stub for calling the CompileFunction runtime call.
// ECX: IC-Data.
// EDX: Arguments descriptor.
// EAX: Function.
void StubCode::GenerateCompileFunctionRuntimeCallStub(Assembler* assembler) {
__ EnterStubFrame();
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve IC data object.
__ pushl(EAX); // Pass function.
__ CallRuntime(kCompileFunctionRuntimeEntry, 1);
__ popl(EAX); // Restore function.
__ popl(ECX); // Restore IC data array.
__ popl(EDX); // Restore arguments descriptor array.
__ LeaveFrame();
__ ret();
}
// 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
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