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sdk/runtime/vm/stub_code_ia32.cc
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asiva@google.com 17c7958b33 Some minor cleanup. 
Review URL: https://chromiumcodereview.appspot.com//10114012

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@6668 260f80e4-7a28-3924-810f-c04153c831b5
2012-04-18 00:20:30 +00:00

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// Copyright (c) 2011, 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/code_generator.h"
#include "vm/compiler.h"
#include "vm/object_store.h"
#include "vm/pages.h"
#include "vm/resolver.h"
#include "vm/scavenger.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);
// 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.
static void GenerateCallRuntimeStub(Assembler* assembler) {
const intptr_t isolate_offset = NativeArguments::isolate_offset();
const intptr_t argc_offset = NativeArguments::argc_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() > 0) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass NativeArguments structure by value and call runtime.
__ movl(Address(ESP, isolate_offset), CTX); // Set isolate in NativeArgs.
__ movl(Address(ESP, argc_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();
}
// 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::GenerateDartCallToRuntimeStub(Assembler* assembler) {
GenerateCallRuntimeStub(assembler);
}
// 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::GenerateStubCallToRuntimeStub(Assembler* assembler) {
GenerateCallRuntimeStub(assembler);
}
// Print the stop message.
static void PrintStopMessage(const char* message) {
OS::Print("Stop message: %s\n", message);
}
// Input parameters:
// ESP : points to return address.
// EAX : stop message (const char*).
// Must preserve all registers, except EAX.
void StubCode::GeneratePrintStopMessageStub(Assembler* assembler) {
// Preserve caller-saved registers.
__ pushl(ECX);
__ pushl(EDX);
__ EnterFrame(0);
// Reserve space for the native argument and align frame before entering
// the C++ world.
__ AddImmediate(ESP, Immediate(-sizeof(kWordSize)));
if (OS::ActivationFrameAlignment() > 0) {
__ andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
// Pass argument and call native function.
__ movl(Address(ESP, 0), EAX);
__ movl(EAX, Immediate(reinterpret_cast<uword>(&PrintStopMessage)));
__ call(EAX);
__ popl(EAX);
__ LeaveFrame();
// Restore caller-saved registers.
__ popl(EDX);
__ popl(ECX);
__ ret();
}
// Input parameters:
// ESP : points to return address.
// ESP + 4 : address of return value.
// EAX : address of first argument in argument array.
// EAX - 4*EDX + 4 : address of last argument in argument array.
// ECX : address of the native function to call.
// EDX : number of arguments to the call.
// Uses EDI.
void StubCode::GenerateCallNativeCFunctionStub(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_offset =
NativeArguments::argc_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() > 0) {
__ 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_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:
// ECX: function object.
// EDX: arguments descriptor array (num_args is first Smi element).
void StubCode::GenerateCallStaticFunctionStub(Assembler* assembler) {
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ 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.
__ EnterFrame(0);
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX);
__ CallRuntimeFromStub(kCompileFunctionRuntimeEntry);
__ 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 dart function.
__ LeaveFrame();
__ Bind(&function_compiled);
// Patch caller.
__ EnterFrame(0);
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve function object.
__ CallRuntimeFromStub(kPatchStaticCallRuntimeEntry);
__ popl(ECX); // Restore function object argument in ECX.
__ popl(EDX); // Restore arguments descriptor array.
// Remove the stub frame as we are about to jump to the dart function.
__ LeaveFrame();
__ movl(EAX, FieldAddress(ECX, Function::code_offset()));
__ 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).
// ECX: function object.
// EDX: arguments descriptor array (num_args is first Smi element).
void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
__ EnterFrame(0);
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX); // Preserve target function.
__ pushl(ECX); // Target function.
__ CallRuntimeFromStub(kFixCallersTargetRuntimeEntry);
__ popl(EAX); // discard argument.
__ popl(EAX); // Restore function.
__ popl(EDX); // Restore arguments descriptor array.
__ movl(EAX, FieldAddress(EAX, Function::code_offset()));
__ movl(EAX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(EAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ LeaveFrame();
__ jmp(EAX);
__ int3();
}
// Lookup for [function-name, arg count] in 'functions_map_'.
// Input parameters (to be treated as read only, unless calling to target!):
// ECX: ic-data.
// EDX: arguments descriptor array (num_args is first Smi element).
// Stack: return address, arguments.
// If the lookup succeeds we jump to the target method from here, otherwise
// we continue in code generated by the caller of 'MegamorphicLookup'.
static void MegamorphicLookup(Assembler* assembler) {
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label class_in_eax, smi_receiver, null_receiver, not_found;
// Total number of args is the first Smi in args descriptor array (EDX).
__ movl(EAX, FieldAddress(EDX, Array::data_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, 0)); // Get receiver. EAX is a Smi.
// TODO(srdjan): Remove the special casing below for null receiver, once
// NullClass is implemented.
__ cmpl(EAX, raw_null);
// Use Object class if receiver is null.
__ j(EQUAL, &null_receiver, Assembler::kNearJump);
__ testl(EAX, Immediate(kSmiTagMask));
__ j(ZERO, &smi_receiver, Assembler::kNearJump);
__ movl(EAX, FieldAddress(EAX, Object::class_offset()));
__ jmp(&class_in_eax, Assembler::kNearJump);
__ Bind(&smi_receiver);
// For Smis we need to get the class from the isolate.
// Load current Isolate pointer from Context structure into EAX.
__ movl(EAX, FieldAddress(CTX, Context::isolate_offset()));
__ movl(EAX, Address(EAX, Isolate::object_store_offset()));
__ movl(EAX, Address(EAX, ObjectStore::smi_class_offset()));
__ jmp(&class_in_eax, Assembler::kNearJump);
__ Bind(&null_receiver);
__ movl(EAX, FieldAddress(CTX, Context::isolate_offset()));
__ movl(EAX, Address(EAX, Isolate::object_store_offset()));
__ movl(EAX, Address(EAX, ObjectStore::object_class_offset()));
__ Bind(&class_in_eax);
// Class is in EAX.
Label loop, next_iteration;
// Get functions_cache, since it is allocated lazily it maybe null.
__ movl(EAX, FieldAddress(EAX, Class::functions_cache_offset()));
// Iterate and search for identical name.
__ leal(EBX, FieldAddress(EAX, Array::data_offset()));
// EBX is pointing into content of functions_map_ array.
__ Bind(&loop);
__ movl(EDI, Address(EBX, FunctionsCache::kFunctionName * kWordSize));
__ cmpl(EDI, raw_null);
__ j(EQUAL, &not_found, Assembler::kNearJump);
__ cmpl(EDI, FieldAddress(ECX, ICData::target_name_offset()));
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
// Name found, check total argument count and named argument count.
__ movl(EAX, FieldAddress(EDX, Array::data_offset()));
// EAX is total argument count as Smi.
__ movl(EDI, Address(EBX, FunctionsCache::kArgCount * kWordSize));
__ cmpl(EAX, EDI); // Compare total argument counts.
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
__ subl(EAX, FieldAddress(EDX, Array::data_offset() + kWordSize));
// EAX is named argument count as Smi.
__ movl(EDI, Address(EBX, FunctionsCache::kNamedArgCount * kWordSize));
__ cmpl(EAX, EDI); // Compare named argument counts.
__ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
// Argument count matches, jump to target.
// EDX: arguments descriptor array.
__ movl(ECX, Address(EBX, FunctionsCache::kFunction * kWordSize));
__ movl(ECX, FieldAddress(ECX, Function::code_offset()));
__ movl(ECX, FieldAddress(ECX, Code::instructions_offset()));
__ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(ECX);
__ Bind(&next_iteration);
__ AddImmediate(EBX, Immediate(FunctionsCache::kNumEntries * kWordSize));
__ jmp(&loop, Assembler::kNearJump);
__ Bind(&not_found);
}
// Input parameters:
// EDI: argument count, may be zero.
// Uses EAX, EBX, ECX, EDX.
static void PushArgumentsArray(Assembler* assembler, intptr_t arg_offset) {
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Allocate array to store arguments of caller.
__ movl(EDX, EDI); // Arguments array length.
__ SmiTag(EDX); // Convert to Smi.
__ 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(ESP, EDX, TIMES_4, arg_offset)); // Addr of first arg.
__ leal(ECX, FieldAddress(EAX, Array::data_offset()));
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 (num_args is first Smi element).
// 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::GenerateMegamorphicLookupStub(Assembler* assembler) {
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
MegamorphicLookup(assembler);
// Lookup in function_table_ failed, resolve, compile and enter function
// into function_table_.
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterFrame(0);
// Preserve values across call to resolving.
// Stack at this point:
// TOS + 0: Saved EBP of previous frame. <== EBP
// TOS + 1: Dart code return address
// TOS + 2: Last argument of caller.
// ....
// Total number of args is the first Smi in args descriptor array (EDX).
__ movl(EAX, FieldAddress(EDX, Array::data_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, kWordSize)); // Get receiver.
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(EAX); // Preserve receiver.
__ pushl(ECX); // Preserve ic-data.
// First resolve the function to get the function object.
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EAX); // Push receiver.
__ CallRuntimeFromStub(kResolveCompileInstanceFunctionRuntimeEntry);
__ popl(EAX); // Remove receiver pushed earlier.
__ popl(ECX); // Pop returned code object into ECX.
// Pop preserved values
__ popl(EDX); // Restore ic-data.
__ popl(EAX); // Restore receiver.
__ popl(EDI); // Restore arguments descriptor array.
__ cmpl(ECX, raw_null);
Label check_implicit_closure;
__ j(EQUAL, &check_implicit_closure, Assembler::kNearJump);
// Remove the stub frame as we are about to jump to the dart function.
__ LeaveFrame();
__ movl(EDX, EDI);
__ movl(ECX, FieldAddress(ECX, Code::instructions_offset()));
__ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(ECX);
__ Bind(&check_implicit_closure);
// EAX: receiver.
// EDX: ic-data.
// ECX: raw_null.
// EDI: arguments descriptor array.
// The target function was not found.
// First check to see if this is a getter function and we are
// trying to create a closure of an instance function.
// Push values that need to be preserved across runtime call.
__ pushl(EAX); // Preserve receiver.
__ pushl(EDX); // Preserve ic-data.
__ pushl(EDI); // Preserve arguments descriptor array.
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EAX); // Push receiver.
__ pushl(EDX); // Ic-data.
__ CallRuntimeFromStub(kResolveImplicitClosureFunctionRuntimeEntry);
__ popl(EAX);
__ popl(EAX);
__ popl(ECX); // Get return value into ECX, might be Closure object.
// Pop preserved values.
__ popl(EDI); // Restore arguments descriptor array.
__ popl(EDX); // Restore ic-data.
__ popl(EAX); // Restore receiver.
__ cmpl(ECX, raw_null);
Label check_implicit_closure_through_getter;
__ j(EQUAL, &check_implicit_closure_through_getter, Assembler::kNearJump);
__ movl(EAX, ECX); // Return value is the closure object.
// Remove the stub frame as we are about return.
__ LeaveFrame();
__ ret();
__ Bind(&check_implicit_closure_through_getter);
// EAX: receiver.
// EDX: ic-data.
// ECX: raw_null.
// EDI: arguments descriptor array.
// This is not the case of an instance so invoke the getter of the
// same name and see if we get a closure back which we are then
// supposed to invoke.
// Push values that need to be preserved across runtime call.
__ pushl(EAX); // Preserve receiver.
__ pushl(EDX); // Preserve ic-data.
__ pushl(EDI); // Preserve arguments descriptor array.
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EAX); // Push receiver.
__ pushl(EDX); // Ic-data.
__ CallRuntimeFromStub(kResolveImplicitClosureThroughGetterRuntimeEntry);
__ popl(EDX); // Pop argument.
__ popl(EAX); // Pop argument.
__ popl(ECX); // get return value into ECX, might be Closure object.
// Pop preserved values.
__ popl(EDI); // Restore arguments descriptor array.
__ popl(EDX); // Restore ic-data.
__ popl(EAX); // Restore receiver.
__ cmpl(ECX, raw_null);
Label function_not_found;
__ j(EQUAL, &function_not_found, Assembler::kNearJump);
// ECX: Closure object.
// EDI: Arguments descriptor array.
__ pushl(raw_null); // Setup space on stack for result from invoking Closure.
__ pushl(ECX); // Closure object.
__ pushl(EDI); // Arguments descriptor.
__ movl(EDI, FieldAddress(EDI, Array::data_offset()));
__ SmiUntag(EDI);
__ subl(EDI, Immediate(1)); // Arguments array length, minus the receiver.
PushArgumentsArray(assembler, (kWordSize * 5));
// Stack layout explaining "(kWordSize * 5)" offset.
// TOS + 0: Argument array.
// TOS + 1: Arguments descriptor array.
// TOS + 2: Closure object.
// TOS + 3: Place for result from closure function.
// TOS + 4: Saved EBP of previous frame. <== EBP
// TOS + 5: Dart code return address
// TOS + 6: Last argument of caller.
// ....
__ CallRuntimeFromStub(kInvokeImplicitClosureFunctionRuntimeEntry);
// Remove arguments.
__ popl(EAX);
__ popl(EAX);
__ popl(EAX);
__ popl(EAX); // Get result into EAX.
// Remove the stub frame as we are about to return.
__ LeaveFrame();
__ ret();
__ Bind(&function_not_found);
// The target function was not found, so invoke method
// "void noSuchMethod(function_name, args_array)".
// EAX: receiver.
// EDX: ic-data.
// ECX: raw_null.
// EDI: argument descriptor array.
__ pushl(raw_null); // Setup space on stack for result from noSuchMethod.
__ pushl(EAX); // Receiver.
__ pushl(EDX); // IC-data.
__ pushl(EDI); // Argument descriptor array.
__ movl(EDI, FieldAddress(EDI, Array::data_offset()));
__ SmiUntag(EDI);
__ subl(EDI, Immediate(1)); // Arguments array length, minus the receiver.
// See stack layout below explaining "wordSize * 6" offset.
PushArgumentsArray(assembler, (kWordSize * 6));
// Stack:
// TOS + 0: Argument array.
// TOS + 1: Argument descriptor array.
// TOS + 2: IC-data.
// TOS + 3: Receiver.
// TOS + 4: Place for result from noSuchMethod.
// TOS + 5: Saved EBP of previous frame. <== EBP
// TOS + 6: Dart code return address
// TOS + 7: Last argument of caller.
// ....
__ CallRuntimeFromStub(kInvokeNoSuchMethodFunctionRuntimeEntry);
// Remove arguments.
__ popl(EAX);
__ popl(EAX);
__ popl(EAX);
__ popl(EAX);
__ popl(EAX); // Get result into EAX.
// Remove the stub frame as we are about to return.
__ LeaveFrame();
__ ret();
}
void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
__ EnterFrame(0);
// EAX: deoptimization reason id.
// Stack at this point:
// TOS + 0: Saved EBP of function frame that will be deoptimized. <== EBP
// TOS + 1: Deoptimization point (return address), will be patched.
// TOS + 2: top-of-stack at deoptimization point (all arguments on stack).
__ pushl(EAX);
__ CallRuntimeFromStub(kDeoptimizeRuntimeEntry);
__ popl(EAX);
__ LeaveFrame();
__ ret();
}
// 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 it computed as:
// RoundedAllocationSize((array_length * kwordSize) + sizeof(RawArray)).
// Assert that length is a Smi.
__ testl(EDX, Immediate(kSmiTagSize));
if (FLAG_use_slow_path) {
__ jmp(&slow_case);
} else {
__ j(NOT_ZERO, &slow_case, Assembler::kNearJump);
}
__ 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, Assembler::kNearJump);
// 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.
__ StoreIntoObject(EAX,
FieldAddress(EAX, Array::type_arguments_offset()),
ECX);
// Set the length field.
__ StoreIntoObject(EAX,
FieldAddress(EAX, Array::length_offset()),
EDX);
// EAX: new object start as a tagged pointer.
// EBX: new object end address.
// EDX: Array length as Smi.
// Store class value for array.
__ movl(ECX, FieldAddress(CTX, Context::isolate_offset()));
__ movl(ECX, Address(ECX, Isolate::object_store_offset()));
__ movl(ECX, Address(ECX, ObjectStore::array_class_offset()));
__ StoreIntoObject(EAX,
FieldAddress(EAX, Array::class_offset()),
ECX);
// 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));
__ movl(FieldAddress(EAX, Array::tags_offset()), ECX);
__ jmp(&done);
__ Bind(&size_tag_overflow);
__ movl(FieldAddress(EAX, Array::tags_offset()), Immediate(0));
__ Bind(&done);
}
// 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);
__ 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);
__ EnterFrame(0);
__ pushl(raw_null); // Setup space on stack for return value.
__ pushl(EDX); // Array length as Smi.
__ pushl(ECX); // Element type.
__ CallRuntimeFromStub(kAllocateArrayRuntimeEntry);
__ 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 (num_args is first Smi element, closure
// object is not included in num_args).
// Note: The closure object is pushed before the first argument to the function
// being called, the stub accesses the closure from this location directly
// when setting up the context and resolving the entry point.
// Uses EDI.
void StubCode::GenerateCallClosureFunctionStub(Assembler* assembler) {
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
// Total number of args is the first Smi in args descriptor array (EDX).
__ movl(EAX, FieldAddress(EDX, Array::data_offset())); // Load num_args.
// Load closure object in EDI.
__ movl(EDI, Address(ESP, EAX, TIMES_2, kWordSize)); // 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.
__ movl(EAX, FieldAddress(EDI, Object::class_offset()));
__ 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.
__ EnterFrame(0);
__ pushl(EDX); // Preserve arguments descriptor array.
__ pushl(ECX);
__ CallRuntimeFromStub(kCompileFunctionRuntimeEntry);
__ 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 (num_args is first Smi element).
__ movl(ECX, FieldAddress(EAX, Code::instructions_offset()));
__ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
__ jmp(ECX);
__ Bind(&not_closure);
// Call runtime to report that a closure call was attempted on a non-closure
// object, passing the non-closure object and its arguments array.
// EDI: non-closure object.
// EDX: arguments descriptor array (num_args is first Smi element, closure
// object is not included in num_args).
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterFrame(0);
__ pushl(raw_null); // Setup space on stack for result from error reporting.
__ pushl(EDI); // Non-closure object.
// Total number of args is the first Smi in args descriptor array (EDX).
__ movl(EDI, FieldAddress(EDX, Array::data_offset())); // Load num_args.
__ SmiUntag(EDI);
// See stack layout below explaining "wordSize * 4" offset.
PushArgumentsArray(assembler, (kWordSize * 4));
// Stack:
// TOS + 0: Argument array.
// TOS + 1: Non-closure object.
// TOS + 2: Place for result from reporting the error.
// TOS + 3: Saved EBP of previous frame. <== EBP
// TOS + 4: Dart code return address
// TOS + 5: Last argument of caller.
// ....
__ CallRuntimeFromStub(kReportObjectNotClosureRuntimeEntry);
__ Stop("runtime call throws an exception");
}
// 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 : pointer to the argument 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.
__ movl(EDX, Address(EDI, Isolate::top_exit_frame_info_offset()));
__ pushl(EDX);
__ movl(Address(EDI, Isolate::top_exit_frame_info_offset()), Immediate(0));
// StackFrameIterator reads the top exit frame info saved in this frame.
// The constant kExitLinkOffsetInEntryFrame must be kept in sync with the
// code above.
// 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 - kExitLinkOffsetInEntryFrame.
__ 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, Array::data_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));
__ movl(EDI, Address(EBP, kArgumentsOffset)); // start of arguments.
__ Bind(&push_arguments);
__ movl(ECX, Address(EDI, EAX, TIMES_4, 0));
__ movl(ECX, Address(ECX, VMHandles::kOffsetOfRawPtrInHandle));
__ 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, which is the first element of the array, a Smi.
__ movl(EDX, Address(EBP, kArgumentsDescOffset));
__ movl(EDX, Address(EDX, VMHandles::kOffsetOfRawPtrInHandle));
__ movl(EDX, FieldAddress(EDX, Array::data_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));
// Initialize the class field in the context object.
// EAX: new object.
// EDX: number of context variables.
__ LoadObject(EBX, context_class); // Load up class field of context.
__ StoreIntoObject(EAX,
FieldAddress(EAX, Context::class_offset()),
EBX);
// 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));
__ movl(FieldAddress(EAX, Context::tags_offset()), EBX); // Tags.
__ jmp(&done);
__ Bind(&size_tag_overflow);
// Set overflow size tag value.
__ movl(FieldAddress(EAX, Context::tags_offset()), Immediate(0));
__ Bind(&done);
}
// 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.
__ EnterFrame(0);
__ pushl(raw_null); // Setup space on stack for return value.
__ SmiTag(EDX);
__ pushl(EDX);
__ CallRuntimeFromStub(kAllocateContextRuntimeEntry); // 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();
}
// 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.type_arguments_instance_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 &&
PageSpace::IsPageAllocatableSize(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);
__ LoadObject(EDX,
Class::ZoneHandle(Object::instantiated_type_arguments_class()));
__ movl(Address(ECX, Instance::class_offset()), EDX); // Set its class.
// Set the tags.
__ movl(Address(ECX, Instance::tags_offset()),
Immediate(RawObject::SizeTag::encode(type_args_size)));
// 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.
}
// Initialize the class field in the object.
// EAX: new object start.
// EBX: next object start.
// EDI: new object type arguments (if is_cls_parameterized).
__ LoadObject(EDX, cls); // Load class of object to be allocated.
__ movl(Address(EAX, Instance::class_offset()), EDX);
// Set the tags.
__ movl(Address(EAX, Instance::tags_offset()),
Immediate(RawObject::SizeTag::encode(instance_size)));
// 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.
// EDX: class of the object to be allocated.
// First try inlining the initialization without a loop.
if (instance_size < (kInlineInstanceSize * kWordSize) &&
cls.num_native_fields() == 0) {
// 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.
Label init_loop;
if (cls.num_native_fields() > 0) {
// Initialize native fields.
// EAX: new object.
// EBX: next object start.
// EDX: class of the object to be allocated.
// ECX: next word to be initialized.
intptr_t offset = Class::num_native_fields_offset() - kHeapObjectTag;
__ movl(EDX, Address(EDX, offset));
__ leal(EDX, Address(EAX, EDX, TIMES_4, sizeof(RawObject)));
// EDX: start of dart fields.
// ECX: next word to be initialized.
Label init_native_loop;
__ Bind(&init_native_loop);
__ cmpl(ECX, EDX);
__ j(ABOVE_EQUAL, &init_loop, Assembler::kNearJump);
__ movl(Address(ECX, 0), Immediate(0));
__ addl(ECX, Immediate(kWordSize));
__ jmp(&init_native_loop, Assembler::kNearJump);
}
// Now initialize the dart fields.
// EAX: new object.
// EBX: next object start.
// ECX: next word to be initialized.
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_instance_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.
__ EnterFrame(0);
__ 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)));
}
__ CallRuntimeFromStub(kAllocateObjectRuntimeEntry); // 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:
// If the signature class is not parameterized, the receiver, if any, will be
// at ESP + 4 instead of ESP + 8, since no type arguments are passed.
// ESP + 8 (or ESP + 4): receiver (only if implicit instance closure).
// ESP + 4 : type arguments object (only if signature class is 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());
const bool is_implicit_static_closure =
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 = (has_type_arguments ? 2 : 1) * kWordSize;
const intptr_t closure_size = Closure::InstanceSize();
const intptr_t context_size = Context::InstanceSize(1); // Captured receiver.
if (FLAG_inline_alloc &&
PageSpace::IsPageAllocatableSize(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);
// Initialize the class field in the object.
// EAX: new closure object.
// ECX: new context object (only if is_implicit_closure).
__ LoadObject(EDX, cls); // Load signature class of closure.
__ movl(Address(EAX, Closure::class_offset()), EDX);
// Set the tags.
__ movl(Address(EAX, Closure::tags_offset()),
Immediate(RawObject::SizeTag::encode(closure_size)));
// 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_static_closure) {
ObjectStore* object_store = Isolate::Current()->object_store();
ASSERT(object_store != NULL);
const Context& empty_context =
Context::ZoneHandle(object_store->empty_context());
__ LoadObject(EDX, empty_context);
__ movl(Address(EAX, Closure::context_offset()), EDX);
} else if (is_implicit_instance_closure) {
// Initialize the new context capturing the receiver.
// Set the class field to the Context class.
__ LoadObject(EBX, Class::ZoneHandle(Object::context_class()));
__ movl(Address(ECX, Context::class_offset()), EBX);
// Set the tags.
__ movl(Address(ECX, Context::tags_offset()),
Immediate(RawObject::SizeTag::encode(context_size)));
// 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 field 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.
if (has_type_arguments) {
ASSERT(!is_implicit_static_closure);
// Use the passed-in type arguments.
__ movl(EDX, Address(ESP, kTypeArgumentsOffset));
__ movl(Address(EAX, Closure::type_arguments_offset()), EDX);
} else {
// Set to null.
__ movl(Address(EAX, Closure::type_arguments_offset()), raw_null);
}
__ movl(Address(EAX, Closure::smrck_offset()), raw_null);
// 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.
__ EnterFrame(0);
__ pushl(raw_null); // Setup space on stack for return value.
__ PushObject(func);
if (is_implicit_static_closure) {
__ CallRuntimeFromStub(kAllocateImplicitStaticClosureRuntimeEntry);
} else {
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) {
__ CallRuntimeFromStub(kAllocateImplicitInstanceClosureRuntimeEntry);
__ popl(EAX); // Pop argument (type arguments of object).
__ popl(EAX); // Pop receiver.
} else {
ASSERT(func.IsNonImplicitClosureFunction());
__ CallRuntimeFromStub(kAllocateClosureRuntimeEntry);
__ 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 noSuchMethod function from the entry code of a dart
// function after an error in passed named arguments is detected.
// Input parameters:
// EBP : points to previous frame pointer.
// EBP + 4 : points to return address.
// EBP + 8 : address of last argument (arg n-1).
// EBP + 8 + 4*(n-1) : address of first argument (arg 0).
// ECX : ic-data.
// EDX : arguments descriptor array.
// Uses EAX, EBX, EDI as temporary registers.
void StubCode::GenerateCallNoSuchMethodFunctionStub(Assembler* assembler) {
// The target function was not found, so invoke method
// "void noSuchMethod(function_name, Array arguments)".
// TODO(regis): For now, we simply pass the actual arguments, both positional
// and named, as the argument array. This is not correct if out-of-order
// named arguments were passed.
// The signature of the "noSuchMethod" method has to change from
// noSuchMethod(String name, Array arguments) to something like
// noSuchMethod(InvocationMirror call).
// Also, the class NoSuchMethodException has to be modified accordingly.
// Total number of args is the first Smi in args descriptor array (EDX).
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(EDI, FieldAddress(EDX, Array::data_offset()));
__ SmiUntag(EDI);
__ movl(EAX, Address(EBP, EDI, TIMES_4, kWordSize)); // Get receiver.
__ EnterFrame(0);
__ pushl(raw_null); // Setup space on stack for result from noSuchMethod.
__ pushl(EAX); // Receiver.
__ pushl(ECX); // IC data array.
__ pushl(EDX); // Arguments descriptor array.
__ subl(EDI, Immediate(1)); // Arguments array length, minus the receiver.
// See stack layout below explaining "wordSize * 8" offset.
PushArgumentsArray(assembler, (kWordSize * 8));
// Stack:
// TOS + 0: Argument array.
// TOS + 1: Arguments descriptor array.
// TOS + 2: Ic-data.
// TOS + 3: Receiver.
// TOS + 4: Place for result from noSuchMethod.
// TOS + 5: Saved EBP of previous frame. <== EBP
// TOS + 6: Dart callee (or stub) code return address
// TOS + 7: Saved EBP of dart caller frame.
// TOS + 8: Dart caller code return address
// TOS + 9: Last argument of caller.
// ....
__ CallRuntimeFromStub(kInvokeNoSuchMethodFunctionRuntimeEntry);
// Remove arguments.
__ popl(EAX);
__ popl(EAX);
__ popl(EAX);
__ popl(EAX);
__ popl(EAX); // Get result into EAX.
// Remove the stub frame as we are about to return.
__ LeaveFrame();
__ ret();
}
// Generate inline cache check for 'num_args'.
// ECX: Inline cache data object.
// EDX: Arguments descriptor array.
// 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) {
__ movl(EBX, FieldAddress(ECX, ICData::function_offset()));
__ incl(FieldAddress(EBX, Function::usage_counter_offset()));
if (CodeGenerator::CanOptimize()) {
__ cmpl(FieldAddress(EBX, Function::usage_counter_offset()),
Immediate(FLAG_optimization_counter_threshold));
Label not_yet_hot;
__ j(LESS_EQUAL, &not_yet_hot);
__ EnterFrame(0);
__ pushl(ECX); // Preserve inline cache data object.
__ pushl(EDX); // Preserve arguments array.
__ pushl(EBX); // Argument for runtime: function object.
__ CallRuntimeFromStub(kOptimizeInvokedFunctionRuntimeEntry);
__ popl(EBX); // Remove argument.
__ popl(EDX); // Restore arguments array.
__ popl(ECX); // Restore inline cache data object.
__ LeaveFrame();
__ Bind(&not_yet_hot);
}
ASSERT(num_args > 0);
// Get receiver (first read number of arguments from argument descriptor array
// and then access the receiver from the stack).
__ movl(EAX, FieldAddress(EDX, Array::data_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, 0)); // EAX (argument_count) is Smi.
Label get_class, ic_miss;
__ call(&get_class);
// EAX: receiver's class
// ECX: IC data array.
#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
// Loop that checks if there is an IC data match.
// EAX: receiver's class.
// 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.
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label loop, found;
if (num_args == 1) {
__ Bind(&loop);
__ movl(EDI, Address(EBX, 0)); // Get class to check.
__ cmpl(EAX, EDI); // Match?
__ j(EQUAL, &found, Assembler::kNearJump);
__ addl(EBX, Immediate(kWordSize * 2)); // Next element (class + target).
__ cmpl(EDI, raw_null); // Done?
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
} else if (num_args == 2) {
// EDI: class to check.
Label no_match;
__ Bind(&loop);
// Get class from IC data to check.
__ movl(EDI, Address(EBX, 0));
// Get receiver using argument descriptor in EDX.
__ movl(EAX, FieldAddress(EDX, Array::data_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, 0)); // EAX (arg. count) is Smi.
__ call(&get_class);
__ cmpl(EAX, EDI); // Match?
__ j(NOT_EQUAL, &no_match, Assembler::kNearJump);
// Check second class/argument.
// Get class from IC data to check.
__ movl(EDI, Address(EBX, kWordSize));
// Get next argument.
__ movl(EAX, FieldAddress(EDX, Array::data_offset()));
__ movl(EAX, Address(ESP, EAX, TIMES_2, -kWordSize));
// EAX (argument count) is Smi.
__ call(&get_class);
__ cmpl(EAX, EDI); // Match?
__ j(EQUAL, &found, Assembler::kNearJump);
__ Bind(&no_match);
// Each test entry has (1 + num_args) array elements.
__ addl(EBX, Immediate(kWordSize * (1 + num_args))); // Next element.
__ cmpl(EDI, raw_null); // Done?
__ j(NOT_EQUAL, &loop, Assembler::kNearJump);
}
__ Bind(&ic_miss);
// Compute address of arguments (first read number of arguments from argument
// descriptor array and then compute address on the stack).
__ movl(EAX, FieldAddress(EDX, Array::data_offset()));
__ leal(EAX, Address(ESP, EAX, TIMES_2, 0)); // EAX is Smi.
__ EnterFrame(0);
__ pushl(EDX); // Preserve arguments array.
__ pushl(ECX); // Preserve IC data array
__ 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(EDX, Address(EAX, -kWordSize * i));
__ pushl(EDX);
}
if (num_args == 1) {
__ CallRuntimeFromStub(kInlineCacheMissHandlerOneArgRuntimeEntry);
} else if (num_args == 2) {
__ CallRuntimeFromStub(kInlineCacheMissHandlerTwoArgsRuntimeEntry);
} else {
UNIMPLEMENTED();
}
// Remove call arguments pushed earlier.
for (intptr_t i = 0; i < num_args; 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 array.
__ LeaveFrame();
Label call_target_function;
__ cmpl(EAX, raw_null);
__ j(NOT_EQUAL, &call_target_function, Assembler::kNearJump);
// NoSuchMethod or closure.
__ jmp(&StubCode::MegamorphicLookupLabel());
__ Bind(&found);
// EBX: Pointer to an IC data check group (classes + target)
__ movl(EAX, Address(EBX, kWordSize * num_args)); // Target function.
__ 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);
__ Bind(&get_class);
Label not_smi;
// Test if Smi -> load Smi class for comparison.
__ testl(EAX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, &not_smi, Assembler::kNearJump);
const Class& smi_class =
Class::ZoneHandle(Isolate::Current()->object_store()->smi_class());
__ LoadObject(EAX, smi_class);
__ ret();
__ Bind(&not_smi);
__ movl(EAX, FieldAddress(EAX, Object::class_offset()));
__ 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 array
// EDX: Arguments array
// TOS(0): return address
// Inline cache data array 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) {
return GenerateNArgsCheckInlineCacheStub(assembler, 1);
}
void StubCode::GenerateTwoArgsCheckInlineCacheStub(Assembler* assembler) {
return GenerateNArgsCheckInlineCacheStub(assembler, 2);
}
// ECX: Function object.
// EDX: Arguments array.
// TOS(0): return address (Dart code).
void StubCode::GenerateBreakpointStaticStub(Assembler* assembler) {
__ EnterFrame(0);
__ pushl(EDX);
__ pushl(ECX);
__ CallRuntimeFromStub(kBreakpointStaticHandlerRuntimeEntry);
__ popl(ECX);
__ popl(EDX);
__ LeaveFrame();
// Now call the static function. The breakpoint handler function
// ensures that the call target is compiled.
__ movl(EAX, FieldAddress(ECX, Function::code_offset()));
__ 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) {
__ EnterFrame(0);
__ pushl(EAX);
__ CallRuntimeFromStub(kBreakpointReturnHandlerRuntimeEntry);
__ 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.
// EDX: Arguments array.
// TOS(0): return address (Dart code).
void StubCode::GenerateBreakpointDynamicStub(Assembler* assembler) {
__ EnterFrame(0);
__ pushl(ECX);
__ pushl(EDX);
__ CallRuntimeFromStub(kBreakpointDynamicHandlerRuntimeEntry);
__ popl(EDX);
__ popl(ECX);
__ LeaveFrame();
// Find out which dispatch stub to call.
Label ic_cache_one_arg;
__ movl(EBX, FieldAddress(ECX, ICData::num_args_tested_offset()));
__ cmpl(EBX, Immediate(1));
__ j(EQUAL, &ic_cache_one_arg, Assembler::kNearJump);
__ jmp(&StubCode::TwoArgsCheckInlineCacheLabel());
__ Bind(&ic_cache_one_arg);
__ jmp(&StubCode::OneArgCheckInlineCacheLabel());
}
// Check if an instance class is a subtype of class/interface using simple
// superchain and interface array traversal. Does not take type parameters into
// account.
// EAX: instance (preserved)
// EDX: class/interface to test against (is class of instance a subtype of it).
// (preserved).
// Result in EBX: 1 is subtype, 0 maybe not.
// Destroys EBX, EDI, ECX.
void StubCode::GenerateIsRawSubTypeStub(Assembler* assembler) {
const Immediate raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label test_class, not_found, found, class_loaded_in_ECX, smi_value;
__ EnterFrame(0);
__ testl(EAX, Immediate(kSmiTagMask));
__ j(ZERO, &smi_value, Assembler::kNearJump);
__ movl(ECX, FieldAddress(EAX, Object::class_offset()));
__ jmp(&class_loaded_in_ECX, Assembler::kNearJump);
__ Bind(&smi_value);
__ movl(ECX, FieldAddress(CTX, Context::isolate_offset()));
__ movl(ECX, Address(ECX, Isolate::object_store_offset()));
__ movl(ECX, Address(ECX, ObjectStore::smi_class_offset()));
__ Bind(&class_loaded_in_ECX);
__ movzxb(EBX, FieldAddress(EDX, Class::is_interface_offset()));
// Check if we are comparing against class or interface.
__ cmpl(EBX, Immediate(0));
__ j(EQUAL, &test_class, Assembler::kNearJump);
// Get interfaces array from instance class.
__ movl(EBX, FieldAddress(ECX, Class::interfaces_offset()));
__ cmpl(EBX, raw_null);
__ j(EQUAL, &not_found, Assembler::kNearJump);
__ movl(EDI, FieldAddress(EBX, Array::length_offset()));
// EDI: array index.
// EBX: interface array.
// EDX: interface searched
Label array_loop;
__ Bind(&array_loop);
__ subl(EDI, Immediate(Smi::RawValue(1)));
// __ cmpl(EDI, Immediate(0));
__ j(LESS, &not_found, Assembler::kNearJump);
// EDI is Smi therefore TIMES_2 instead of TIMES_4.
// Get type from array.
__ movl(ECX, FieldAddress(EBX, EDI, TIMES_2, Array::data_offset()));
__ movl(ECX, FieldAddress(ECX, Type::type_class_offset()));
__ cmpl(ECX, EDX);
__ j(EQUAL, &found, Assembler::kNearJump);
__ jmp(&array_loop, Assembler::kNearJump);
__ Bind(&not_found);
__ xorl(EBX, EBX);
__ LeaveFrame();
__ ret();
__ Bind(&found);
__ movl(EBX, Immediate(1));
__ LeaveFrame();
__ ret();
__ Bind(&test_class);
// EDX: test class.
__ cmpl(ECX, EDX);
__ j(EQUAL, &found, Assembler::kNearJump);
// Check superclasses using a loop (faster than runtime call).
Label super_loop;
__ Bind(&super_loop);
// ECX: class -> super.
__ movl(ECX, FieldAddress(ECX, Class::super_type_offset()));
// The supertype of Object is a null object.
__ cmpl(ECX, raw_null);
__ j(EQUAL, &not_found, Assembler::kNearJump);
__ movl(ECX, FieldAddress(ECX, Type::type_class_offset()));
__ cmpl(EDX, ECX);
__ j(NOT_EQUAL, &super_loop, Assembler::kNearJump);
__ jmp(&found, Assembler::kNearJump);
}
} // namespace dart
#endif // defined TARGET_ARCH_IA32
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