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v8/src/ia32/macro-assembler-ia32.h
bmeurer 30aca03ad1 [turbofan] Implement the call protocol properly for direct calls. 
The callees are expected to properly set the number of actual
arguments passed to the callee, which is now represented correctly
in the TurboFan graphs by a new Parameter right before the context
Parameter.  Currently this is only being used for outgoing calls.

Note that this requires disabling two of the TF code stub tests,
because of the JavaScript graphs are not automagically compatible
with abitrary (incoming) code stub interface descriptors.  If we
want to support JS code stubs at all, then we need to find a sane
way to feed in this information.

Drive-by-fix: Don't insert a direct call to a classConstructor.

R=mstarzinger@chromium.org
BUG=v8:4413, v8:4428
LOG=n

Review URL: https://codereview.chromium.org/1410633006

Cr-Commit-Position: refs/heads/master@{#31789}
2015-11-04 14:08:59 +00:00

1142 lines
45 KiB
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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_
#define V8_IA32_MACRO_ASSEMBLER_IA32_H_
#include "src/assembler.h"
#include "src/bailout-reason.h"
#include "src/frames.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
// Give alias names to registers for calling conventions.
const Register kReturnRegister0 = {Register::kCode_eax};
const Register kReturnRegister1 = {Register::kCode_edx};
const Register kJSFunctionRegister = {Register::kCode_edi};
const Register kContextRegister = {Register::kCode_esi};
const Register kInterpreterAccumulatorRegister = {Register::kCode_eax};
const Register kInterpreterRegisterFileRegister = {Register::kCode_edx};
const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_ecx};
const Register kInterpreterBytecodeArrayRegister = {Register::kCode_edi};
const Register kJavaScriptCallArgCountRegister = {Register::kCode_eax};
const Register kRuntimeCallFunctionRegister = {Register::kCode_ebx};
const Register kRuntimeCallArgCountRegister = {Register::kCode_eax};
// Spill slots used by interpreter dispatch calling convention.
const int kInterpreterDispatchTableSpillSlot = -1;
// Convenience for platform-independent signatures. We do not normally
// distinguish memory operands from other operands on ia32.
typedef Operand MemOperand;
enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
enum PointersToHereCheck {
kPointersToHereMaybeInteresting,
kPointersToHereAreAlwaysInteresting
};
enum RegisterValueType {
REGISTER_VALUE_IS_SMI,
REGISTER_VALUE_IS_INT32
};
#ifdef DEBUG
bool AreAliased(Register reg1,
Register reg2,
Register reg3 = no_reg,
Register reg4 = no_reg,
Register reg5 = no_reg,
Register reg6 = no_reg,
Register reg7 = no_reg,
Register reg8 = no_reg);
#endif
// MacroAssembler implements a collection of frequently used macros.
class MacroAssembler: public Assembler {
public:
// The isolate parameter can be NULL if the macro assembler should
// not use isolate-dependent functionality. In this case, it's the
// responsibility of the caller to never invoke such function on the
// macro assembler.
MacroAssembler(Isolate* isolate, void* buffer, int size);
void Load(Register dst, const Operand& src, Representation r);
void Store(Register src, const Operand& dst, Representation r);
// Load a register with a long value as efficiently as possible.
void Set(Register dst, int32_t x) {
if (x == 0) {
xor_(dst, dst);
} else {
mov(dst, Immediate(x));
}
}
void Set(const Operand& dst, int32_t x) { mov(dst, Immediate(x)); }
// Operations on roots in the root-array.
void LoadRoot(Register destination, Heap::RootListIndex index);
void StoreRoot(Register source, Register scratch, Heap::RootListIndex index);
void CompareRoot(Register with, Register scratch, Heap::RootListIndex index);
// These methods can only be used with constant roots (i.e. non-writable
// and not in new space).
void CompareRoot(Register with, Heap::RootListIndex index);
void CompareRoot(const Operand& with, Heap::RootListIndex index);
void PushRoot(Heap::RootListIndex index);
// Compare the object in a register to a value and jump if they are equal.
void JumpIfRoot(Register with, Heap::RootListIndex index, Label* if_equal,
Label::Distance if_equal_distance = Label::kNear) {
CompareRoot(with, index);
j(equal, if_equal, if_equal_distance);
}
// Compare the object in a register to a value and jump if they are not equal.
void JumpIfNotRoot(Register with, Heap::RootListIndex index,
Label* if_not_equal,
Label::Distance if_not_equal_distance = Label::kNear) {
CompareRoot(with, index);
j(not_equal, if_not_equal, if_not_equal_distance);
}
// ---------------------------------------------------------------------------
// GC Support
enum RememberedSetFinalAction {
kReturnAtEnd,
kFallThroughAtEnd
};
// Record in the remembered set the fact that we have a pointer to new space
// at the address pointed to by the addr register. Only works if addr is not
// in new space.
void RememberedSetHelper(Register object, // Used for debug code.
Register addr,
Register scratch,
SaveFPRegsMode save_fp,
RememberedSetFinalAction and_then);
void CheckPageFlag(Register object,
Register scratch,
int mask,
Condition cc,
Label* condition_met,
Label::Distance condition_met_distance = Label::kFar);
void CheckPageFlagForMap(
Handle<Map> map,
int mask,
Condition cc,
Label* condition_met,
Label::Distance condition_met_distance = Label::kFar);
// Check if object is in new space. Jumps if the object is not in new space.
// The register scratch can be object itself, but scratch will be clobbered.
void JumpIfNotInNewSpace(Register object,
Register scratch,
Label* branch,
Label::Distance distance = Label::kFar) {
InNewSpace(object, scratch, zero, branch, distance);
}
// Check if object is in new space. Jumps if the object is in new space.
// The register scratch can be object itself, but it will be clobbered.
void JumpIfInNewSpace(Register object,
Register scratch,
Label* branch,
Label::Distance distance = Label::kFar) {
InNewSpace(object, scratch, not_zero, branch, distance);
}
// Check if an object has a given incremental marking color. Also uses ecx!
void HasColor(Register object,
Register scratch0,
Register scratch1,
Label* has_color,
Label::Distance has_color_distance,
int first_bit,
int second_bit);
void JumpIfBlack(Register object,
Register scratch0,
Register scratch1,
Label* on_black,
Label::Distance on_black_distance = Label::kFar);
// Checks the color of an object. If the object is already grey or black
// then we just fall through, since it is already live. If it is white and
// we can determine that it doesn't need to be scanned, then we just mark it
// black and fall through. For the rest we jump to the label so the
// incremental marker can fix its assumptions.
void EnsureNotWhite(Register object,
Register scratch1,
Register scratch2,
Label* object_is_white_and_not_data,
Label::Distance distance);
// Notify the garbage collector that we wrote a pointer into an object.
// |object| is the object being stored into, |value| is the object being
// stored. value and scratch registers are clobbered by the operation.
// The offset is the offset from the start of the object, not the offset from
// the tagged HeapObject pointer. For use with FieldOperand(reg, off).
void RecordWriteField(
Register object,
int offset,
Register value,
Register scratch,
SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
SmiCheck smi_check = INLINE_SMI_CHECK,
PointersToHereCheck pointers_to_here_check_for_value =
kPointersToHereMaybeInteresting);
// As above, but the offset has the tag presubtracted. For use with
// Operand(reg, off).
void RecordWriteContextSlot(
Register context,
int offset,
Register value,
Register scratch,
SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
SmiCheck smi_check = INLINE_SMI_CHECK,
PointersToHereCheck pointers_to_here_check_for_value =
kPointersToHereMaybeInteresting) {
RecordWriteField(context,
offset + kHeapObjectTag,
value,
scratch,
save_fp,
remembered_set_action,
smi_check,
pointers_to_here_check_for_value);
}
// Notify the garbage collector that we wrote a pointer into a fixed array.
// |array| is the array being stored into, |value| is the
// object being stored. |index| is the array index represented as a
// Smi. All registers are clobbered by the operation RecordWriteArray
// filters out smis so it does not update the write barrier if the
// value is a smi.
void RecordWriteArray(
Register array,
Register value,
Register index,
SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
SmiCheck smi_check = INLINE_SMI_CHECK,
PointersToHereCheck pointers_to_here_check_for_value =
kPointersToHereMaybeInteresting);
// For page containing |object| mark region covering |address|
// dirty. |object| is the object being stored into, |value| is the
// object being stored. The address and value registers are clobbered by the
// operation. RecordWrite filters out smis so it does not update the
// write barrier if the value is a smi.
void RecordWrite(
Register object,
Register address,
Register value,
SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
SmiCheck smi_check = INLINE_SMI_CHECK,
PointersToHereCheck pointers_to_here_check_for_value =
kPointersToHereMaybeInteresting);
// For page containing |object| mark the region covering the object's map
// dirty. |object| is the object being stored into, |map| is the Map object
// that was stored.
void RecordWriteForMap(
Register object,
Handle<Map> map,
Register scratch1,
Register scratch2,
SaveFPRegsMode save_fp);
// ---------------------------------------------------------------------------
// Debugger Support
void DebugBreak();
// Generates function and stub prologue code.
void StubPrologue();
void Prologue(bool code_pre_aging);
// Enter specific kind of exit frame. Expects the number of
// arguments in register eax and sets up the number of arguments in
// register edi and the pointer to the first argument in register
// esi.
void EnterExitFrame(bool save_doubles);
void EnterApiExitFrame(int argc);
// Leave the current exit frame. Expects the return value in
// register eax:edx (untouched) and the pointer to the first
// argument in register esi (if pop_arguments == true).
void LeaveExitFrame(bool save_doubles, bool pop_arguments = true);
// Leave the current exit frame. Expects the return value in
// register eax (untouched).
void LeaveApiExitFrame(bool restore_context);
// Find the function context up the context chain.
void LoadContext(Register dst, int context_chain_length);
// Load the global proxy from the current context.
void LoadGlobalProxy(Register dst);
// Conditionally load the cached Array transitioned map of type
// transitioned_kind from the native context if the map in register
// map_in_out is the cached Array map in the native context of
// expected_kind.
void LoadTransitionedArrayMapConditional(
ElementsKind expected_kind,
ElementsKind transitioned_kind,
Register map_in_out,
Register scratch,
Label* no_map_match);
// Load the global function with the given index.
void LoadGlobalFunction(int index, Register function);
// Load the initial map from the global function. The registers
// function and map can be the same.
void LoadGlobalFunctionInitialMap(Register function, Register map);
// Push and pop the registers that can hold pointers.
void PushSafepointRegisters() { pushad(); }
void PopSafepointRegisters() { popad(); }
// Store the value in register/immediate src in the safepoint
// register stack slot for register dst.
void StoreToSafepointRegisterSlot(Register dst, Register src);
void StoreToSafepointRegisterSlot(Register dst, Immediate src);
void LoadFromSafepointRegisterSlot(Register dst, Register src);
void LoadHeapObject(Register result, Handle<HeapObject> object);
void CmpHeapObject(Register reg, Handle<HeapObject> object);
void PushHeapObject(Handle<HeapObject> object);
void LoadObject(Register result, Handle<Object> object) {
AllowDeferredHandleDereference heap_object_check;
if (object->IsHeapObject()) {
LoadHeapObject(result, Handle<HeapObject>::cast(object));
} else {
Move(result, Immediate(object));
}
}
void CmpObject(Register reg, Handle<Object> object) {
AllowDeferredHandleDereference heap_object_check;
if (object->IsHeapObject()) {
CmpHeapObject(reg, Handle<HeapObject>::cast(object));
} else {
cmp(reg, Immediate(object));
}
}
// Compare the given value and the value of weak cell.
void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch);
void GetWeakValue(Register value, Handle<WeakCell> cell);
// Load the value of the weak cell in the value register. Branch to the given
// miss label if the weak cell was cleared.
void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss);
// ---------------------------------------------------------------------------
// JavaScript invokes
// Invoke the JavaScript function code by either calling or jumping.
void InvokeCode(Register code,
const ParameterCount& expected,
const ParameterCount& actual,
InvokeFlag flag,
const CallWrapper& call_wrapper) {
InvokeCode(Operand(code), expected, actual, flag, call_wrapper);
}
void InvokeCode(const Operand& code,
const ParameterCount& expected,
const ParameterCount& actual,
InvokeFlag flag,
const CallWrapper& call_wrapper);
// Invoke the JavaScript function in the given register. Changes the
// current context to the context in the function before invoking.
void InvokeFunction(Register function,
const ParameterCount& actual,
InvokeFlag flag,
const CallWrapper& call_wrapper);
void InvokeFunction(Register function,
const ParameterCount& expected,
const ParameterCount& actual,
InvokeFlag flag,
const CallWrapper& call_wrapper);
void InvokeFunction(Handle<JSFunction> function,
const ParameterCount& expected,
const ParameterCount& actual,
InvokeFlag flag,
const CallWrapper& call_wrapper);
// Invoke specified builtin JavaScript function.
void InvokeBuiltin(int native_context_index, InvokeFlag flag,
const CallWrapper& call_wrapper = NullCallWrapper());
// Store the function for the given builtin in the target register.
void GetBuiltinFunction(Register target, int native_context_index);
// Store the code object for the given builtin in the target register.
void GetBuiltinEntry(Register target, int native_context_index);
// Expression support
// cvtsi2sd instruction only writes to the low 64-bit of dst register, which
// hinders register renaming and makes dependence chains longer. So we use
// xorps to clear the dst register before cvtsi2sd to solve this issue.
void Cvtsi2sd(XMMRegister dst, Register src) { Cvtsi2sd(dst, Operand(src)); }
void Cvtsi2sd(XMMRegister dst, const Operand& src);
// Support for constant splitting.
bool IsUnsafeImmediate(const Immediate& x);
void SafeMove(Register dst, const Immediate& x);
void SafePush(const Immediate& x);
// Compare object type for heap object.
// Incoming register is heap_object and outgoing register is map.
void CmpObjectType(Register heap_object, InstanceType type, Register map);
// Compare instance type for map.
void CmpInstanceType(Register map, InstanceType type);
// Check if a map for a JSObject indicates that the object has fast elements.
// Jump to the specified label if it does not.
void CheckFastElements(Register map,
Label* fail,
Label::Distance distance = Label::kFar);
// Check if a map for a JSObject indicates that the object can have both smi
// and HeapObject elements. Jump to the specified label if it does not.
void CheckFastObjectElements(Register map,
Label* fail,
Label::Distance distance = Label::kFar);
// Check if a map for a JSObject indicates that the object has fast smi only
// elements. Jump to the specified label if it does not.
void CheckFastSmiElements(Register map,
Label* fail,
Label::Distance distance = Label::kFar);
// Check to see if maybe_number can be stored as a double in
// FastDoubleElements. If it can, store it at the index specified by key in
// the FastDoubleElements array elements, otherwise jump to fail.
void StoreNumberToDoubleElements(Register maybe_number,
Register elements,
Register key,
Register scratch1,
XMMRegister scratch2,
Label* fail,
int offset = 0);
// Compare an object's map with the specified map.
void CompareMap(Register obj, Handle<Map> map);
// Check if the map of an object is equal to a specified map and branch to
// label if not. Skip the smi check if not required (object is known to be a
// heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
// against maps that are ElementsKind transition maps of the specified map.
void CheckMap(Register obj,
Handle<Map> map,
Label* fail,
SmiCheckType smi_check_type);
// Check if the map of an object is equal to a specified weak map and branch
// to a specified target if equal. Skip the smi check if not required
// (object is known to be a heap object)
void DispatchWeakMap(Register obj, Register scratch1, Register scratch2,
Handle<WeakCell> cell, Handle<Code> success,
SmiCheckType smi_check_type);
// Check if the object in register heap_object is a string. Afterwards the
// register map contains the object map and the register instance_type
// contains the instance_type. The registers map and instance_type can be the
// same in which case it contains the instance type afterwards. Either of the
// registers map and instance_type can be the same as heap_object.
Condition IsObjectStringType(Register heap_object,
Register map,
Register instance_type);
// Check if the object in register heap_object is a name. Afterwards the
// register map contains the object map and the register instance_type
// contains the instance_type. The registers map and instance_type can be the
// same in which case it contains the instance type afterwards. Either of the
// registers map and instance_type can be the same as heap_object.
Condition IsObjectNameType(Register heap_object,
Register map,
Register instance_type);
// FCmp is similar to integer cmp, but requires unsigned
// jcc instructions (je, ja, jae, jb, jbe, je, and jz).
void FCmp();
void ClampUint8(Register reg);
void ClampDoubleToUint8(XMMRegister input_reg,
XMMRegister scratch_reg,
Register result_reg);
void SlowTruncateToI(Register result_reg, Register input_reg,
int offset = HeapNumber::kValueOffset - kHeapObjectTag);
void TruncateHeapNumberToI(Register result_reg, Register input_reg);
void TruncateDoubleToI(Register result_reg, XMMRegister input_reg);
void DoubleToI(Register result_reg, XMMRegister input_reg,
XMMRegister scratch, MinusZeroMode minus_zero_mode,
Label* lost_precision, Label* is_nan, Label* minus_zero,
Label::Distance dst = Label::kFar);
// Smi tagging support.
void SmiTag(Register reg) {
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize == 1);
add(reg, reg);
}
void SmiUntag(Register reg) {
sar(reg, kSmiTagSize);
}
// Modifies the register even if it does not contain a Smi!
void SmiUntag(Register reg, Label* is_smi) {
STATIC_ASSERT(kSmiTagSize == 1);
sar(reg, kSmiTagSize);
STATIC_ASSERT(kSmiTag == 0);
j(not_carry, is_smi);
}
void LoadUint32(XMMRegister dst, Register src) {
LoadUint32(dst, Operand(src));
}
void LoadUint32(XMMRegister dst, const Operand& src);
// Jump the register contains a smi.
inline void JumpIfSmi(Register value,
Label* smi_label,
Label::Distance distance = Label::kFar) {
test(value, Immediate(kSmiTagMask));
j(zero, smi_label, distance);
}
// Jump if the operand is a smi.
inline void JumpIfSmi(Operand value,
Label* smi_label,
Label::Distance distance = Label::kFar) {
test(value, Immediate(kSmiTagMask));
j(zero, smi_label, distance);
}
// Jump if register contain a non-smi.
inline void JumpIfNotSmi(Register value,
Label* not_smi_label,
Label::Distance distance = Label::kFar) {
test(value, Immediate(kSmiTagMask));
j(not_zero, not_smi_label, distance);
}
void LoadInstanceDescriptors(Register map, Register descriptors);
void EnumLength(Register dst, Register map);
void NumberOfOwnDescriptors(Register dst, Register map);
void LoadAccessor(Register dst, Register holder, int accessor_index,
AccessorComponent accessor);
template<typename Field>
void DecodeField(Register reg) {
static const int shift = Field::kShift;
static const int mask = Field::kMask >> Field::kShift;
if (shift != 0) {
sar(reg, shift);
}
and_(reg, Immediate(mask));
}
template<typename Field>
void DecodeFieldToSmi(Register reg) {
static const int shift = Field::kShift;
static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize;
STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0);
STATIC_ASSERT(kSmiTag == 0);
if (shift < kSmiTagSize) {
shl(reg, kSmiTagSize - shift);
} else if (shift > kSmiTagSize) {
sar(reg, shift - kSmiTagSize);
}
and_(reg, Immediate(mask));
}
void LoadPowerOf2(XMMRegister dst, Register scratch, int power);
// Abort execution if argument is not a number, enabled via --debug-code.
void AssertNumber(Register object);
// Abort execution if argument is not a smi, enabled via --debug-code.
void AssertSmi(Register object);
// Abort execution if argument is a smi, enabled via --debug-code.
void AssertNotSmi(Register object);
// Abort execution if argument is not a string, enabled via --debug-code.
void AssertString(Register object);
// Abort execution if argument is not a name, enabled via --debug-code.
void AssertName(Register object);
// Abort execution if argument is not a JSFunction, enabled via --debug-code.
void AssertFunction(Register object);
// Abort execution if argument is not undefined or an AllocationSite, enabled
// via --debug-code.
void AssertUndefinedOrAllocationSite(Register object);
// ---------------------------------------------------------------------------
// Exception handling
// Push a new stack handler and link it into stack handler chain.
void PushStackHandler();
// Unlink the stack handler on top of the stack from the stack handler chain.
void PopStackHandler();
// ---------------------------------------------------------------------------
// Inline caching support
// Generate code for checking access rights - used for security checks
// on access to global objects across environments. The holder register
// is left untouched, but the scratch register is clobbered.
void CheckAccessGlobalProxy(Register holder_reg,
Register scratch1,
Register scratch2,
Label* miss);
void GetNumberHash(Register r0, Register scratch);
void LoadFromNumberDictionary(Label* miss,
Register elements,
Register key,
Register r0,
Register r1,
Register r2,
Register result);
// ---------------------------------------------------------------------------
// Allocation support
// Allocate an object in new space or old space. If the given space
// is exhausted control continues at the gc_required label. The allocated
// object is returned in result and end of the new object is returned in
// result_end. The register scratch can be passed as no_reg in which case
// an additional object reference will be added to the reloc info. The
// returned pointers in result and result_end have not yet been tagged as
// heap objects. If result_contains_top_on_entry is true the content of
// result is known to be the allocation top on entry (could be result_end
// from a previous call). If result_contains_top_on_entry is true scratch
// should be no_reg as it is never used.
void Allocate(int object_size,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags);
void Allocate(int header_size,
ScaleFactor element_size,
Register element_count,
RegisterValueType element_count_type,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags);
void Allocate(Register object_size,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags);
// Allocate a heap number in new space with undefined value. The
// register scratch2 can be passed as no_reg; the others must be
// valid registers. Returns tagged pointer in result register, or
// jumps to gc_required if new space is full.
void AllocateHeapNumber(Register result,
Register scratch1,
Register scratch2,
Label* gc_required,
MutableMode mode = IMMUTABLE);
// Allocate a sequential string. All the header fields of the string object
// are initialized.
void AllocateTwoByteString(Register result,
Register length,
Register scratch1,
Register scratch2,
Register scratch3,
Label* gc_required);
void AllocateOneByteString(Register result, Register length,
Register scratch1, Register scratch2,
Register scratch3, Label* gc_required);
void AllocateOneByteString(Register result, int length, Register scratch1,
Register scratch2, Label* gc_required);
// Allocate a raw cons string object. Only the map field of the result is
// initialized.
void AllocateTwoByteConsString(Register result,
Register scratch1,
Register scratch2,
Label* gc_required);
void AllocateOneByteConsString(Register result, Register scratch1,
Register scratch2, Label* gc_required);
// Allocate a raw sliced string object. Only the map field of the result is
// initialized.
void AllocateTwoByteSlicedString(Register result,
Register scratch1,
Register scratch2,
Label* gc_required);
void AllocateOneByteSlicedString(Register result, Register scratch1,
Register scratch2, Label* gc_required);
// Copy memory, byte-by-byte, from source to destination. Not optimized for
// long or aligned copies.
// The contents of index and scratch are destroyed.
void CopyBytes(Register source,
Register destination,
Register length,
Register scratch);
// Initialize fields with filler values. Fields starting at |start_offset|
// not including end_offset are overwritten with the value in |filler|. At
// the end the loop, |start_offset| takes the value of |end_offset|.
void InitializeFieldsWithFiller(Register start_offset,
Register end_offset,
Register filler);
// ---------------------------------------------------------------------------
// Support functions.
// Check a boolean-bit of a Smi field.
void BooleanBitTest(Register object, int field_offset, int bit_index);
// Check if result is zero and op is negative.
void NegativeZeroTest(Register result, Register op, Label* then_label);
// Check if result is zero and any of op1 and op2 are negative.
// Register scratch is destroyed, and it must be different from op2.
void NegativeZeroTest(Register result, Register op1, Register op2,
Register scratch, Label* then_label);
// Machine code version of Map::GetConstructor().
// |temp| holds |result|'s map when done.
void GetMapConstructor(Register result, Register map, Register temp);
// Try to get function prototype of a function and puts the value in
// the result register. Checks that the function really is a
// function and jumps to the miss label if the fast checks fail. The
// function register will be untouched; the other registers may be
// clobbered.
void TryGetFunctionPrototype(Register function, Register result,
Register scratch, Label* miss);
// Picks out an array index from the hash field.
// Register use:
// hash - holds the index's hash. Clobbered.
// index - holds the overwritten index on exit.
void IndexFromHash(Register hash, Register index);
// ---------------------------------------------------------------------------
// Runtime calls
// Call a code stub. Generate the code if necessary.
void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None());
// Tail call a code stub (jump). Generate the code if necessary.
void TailCallStub(CodeStub* stub);
// Return from a code stub after popping its arguments.
void StubReturn(int argc);
// Call a runtime routine.
void CallRuntime(const Runtime::Function* f,
int num_arguments,
SaveFPRegsMode save_doubles = kDontSaveFPRegs);
void CallRuntimeSaveDoubles(Runtime::FunctionId id) {
const Runtime::Function* function = Runtime::FunctionForId(id);
CallRuntime(function, function->nargs, kSaveFPRegs);
}
// Convenience function: Same as above, but takes the fid instead.
void CallRuntime(Runtime::FunctionId id,
int num_arguments,
SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
CallRuntime(Runtime::FunctionForId(id), num_arguments, save_doubles);
}
// Convenience function: call an external reference.
void CallExternalReference(ExternalReference ref, int num_arguments);
// Tail call of a runtime routine (jump).
// Like JumpToExternalReference, but also takes care of passing the number
// of parameters.
void TailCallExternalReference(const ExternalReference& ext,
int num_arguments,
int result_size);
// Convenience function: tail call a runtime routine (jump).
void TailCallRuntime(Runtime::FunctionId fid,
int num_arguments,
int result_size);
// Before calling a C-function from generated code, align arguments on stack.
// After aligning the frame, arguments must be stored in esp[0], esp[4],
// etc., not pushed. The argument count assumes all arguments are word sized.
// Some compilers/platforms require the stack to be aligned when calling
// C++ code.
// Needs a scratch register to do some arithmetic. This register will be
// trashed.
void PrepareCallCFunction(int num_arguments, Register scratch);
// Calls a C function and cleans up the space for arguments allocated
// by PrepareCallCFunction. The called function is not allowed to trigger a
// garbage collection, since that might move the code and invalidate the
// return address (unless this is somehow accounted for by the called
// function).
void CallCFunction(ExternalReference function, int num_arguments);
void CallCFunction(Register function, int num_arguments);
// Jump to a runtime routine.
void JumpToExternalReference(const ExternalReference& ext);
// ---------------------------------------------------------------------------
// Utilities
void Ret();
// Return and drop arguments from stack, where the number of arguments
// may be bigger than 2^16 - 1. Requires a scratch register.
void Ret(int bytes_dropped, Register scratch);
// Emit code to discard a non-negative number of pointer-sized elements
// from the stack, clobbering only the esp register.
void Drop(int element_count);
void Call(Label* target) { call(target); }
void Call(Handle<Code> target, RelocInfo::Mode rmode) { call(target, rmode); }
void Jump(Handle<Code> target, RelocInfo::Mode rmode) { jmp(target, rmode); }
void Push(Register src) { push(src); }
void Push(const Operand& src) { push(src); }
void Push(Immediate value) { push(value); }
void Pop(Register dst) { pop(dst); }
void PushReturnAddressFrom(Register src) { push(src); }
void PopReturnAddressTo(Register dst) { pop(dst); }
// Non-SSE2 instructions.
void Pextrd(Register dst, XMMRegister src, int8_t imm8);
void Pinsrd(XMMRegister dst, Register src, int8_t imm8) {
Pinsrd(dst, Operand(src), imm8);
}
void Pinsrd(XMMRegister dst, const Operand& src, int8_t imm8);
void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); }
void Lzcnt(Register dst, const Operand& src);
void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); }
void Tzcnt(Register dst, const Operand& src);
void Popcnt(Register dst, Register src) { Popcnt(dst, Operand(src)); }
void Popcnt(Register dst, const Operand& src);
// Emit call to the code we are currently generating.
void CallSelf() {
Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
call(self, RelocInfo::CODE_TARGET);
}
// Move if the registers are not identical.
void Move(Register target, Register source);
// Move a constant into a destination using the most efficient encoding.
void Move(Register dst, const Immediate& x);
void Move(const Operand& dst, const Immediate& x);
// Move an immediate into an XMM register.
void Move(XMMRegister dst, uint32_t src);
void Move(XMMRegister dst, uint64_t src);
void Move(XMMRegister dst, double src) { Move(dst, bit_cast<uint64_t>(src)); }
// Push a handle value.
void Push(Handle<Object> handle) { push(Immediate(handle)); }
void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); }
Handle<Object> CodeObject() {
DCHECK(!code_object_.is_null());
return code_object_;
}
// Emit code for a truncating division by a constant. The dividend register is
// unchanged, the result is in edx, and eax gets clobbered.
void TruncatingDiv(Register dividend, int32_t divisor);
// ---------------------------------------------------------------------------
// StatsCounter support
void SetCounter(StatsCounter* counter, int value);
void IncrementCounter(StatsCounter* counter, int value);
void DecrementCounter(StatsCounter* counter, int value);
void IncrementCounter(Condition cc, StatsCounter* counter, int value);
void DecrementCounter(Condition cc, StatsCounter* counter, int value);
// ---------------------------------------------------------------------------
// Debugging
// Calls Abort(msg) if the condition cc is not satisfied.
// Use --debug_code to enable.
void Assert(Condition cc, BailoutReason reason);
void AssertFastElements(Register elements);
// Like Assert(), but always enabled.
void Check(Condition cc, BailoutReason reason);
// Print a message to stdout and abort execution.
void Abort(BailoutReason reason);
// Check that the stack is aligned.
void CheckStackAlignment();
// Verify restrictions about code generated in stubs.
void set_generating_stub(bool value) { generating_stub_ = value; }
bool generating_stub() { return generating_stub_; }
void set_has_frame(bool value) { has_frame_ = value; }
bool has_frame() { return has_frame_; }
inline bool AllowThisStubCall(CodeStub* stub);
// ---------------------------------------------------------------------------
// String utilities.
// Check whether the instance type represents a flat one-byte string. Jump to
// the label if not. If the instance type can be scratched specify same
// register for both instance type and scratch.
void JumpIfInstanceTypeIsNotSequentialOneByte(
Register instance_type, Register scratch,
Label* on_not_flat_one_byte_string);
// Checks if both objects are sequential one-byte strings, and jumps to label
// if either is not.
void JumpIfNotBothSequentialOneByteStrings(
Register object1, Register object2, Register scratch1, Register scratch2,
Label* on_not_flat_one_byte_strings);
// Checks if the given register or operand is a unique name
void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name,
Label::Distance distance = Label::kFar) {
JumpIfNotUniqueNameInstanceType(Operand(reg), not_unique_name, distance);
}
void JumpIfNotUniqueNameInstanceType(Operand operand, Label* not_unique_name,
Label::Distance distance = Label::kFar);
void EmitSeqStringSetCharCheck(Register string,
Register index,
Register value,
uint32_t encoding_mask);
static int SafepointRegisterStackIndex(Register reg) {
return SafepointRegisterStackIndex(reg.code());
}
// Load the type feedback vector from a JavaScript frame.
void EmitLoadTypeFeedbackVector(Register vector);
// Activation support.
void EnterFrame(StackFrame::Type type);
void EnterFrame(StackFrame::Type type, bool load_constant_pool_pointer_reg);
void LeaveFrame(StackFrame::Type type);
// Expects object in eax and returns map with validated enum cache
// in eax. Assumes that any other register can be used as a scratch.
void CheckEnumCache(Label* call_runtime);
// AllocationMemento support. Arrays may have an associated
// AllocationMemento object that can be checked for in order to pretransition
// to another type.
// On entry, receiver_reg should point to the array object.
// scratch_reg gets clobbered.
// If allocation info is present, conditional code is set to equal.
void TestJSArrayForAllocationMemento(Register receiver_reg,
Register scratch_reg,
Label* no_memento_found);
void JumpIfJSArrayHasAllocationMemento(Register receiver_reg,
Register scratch_reg,
Label* memento_found) {
Label no_memento_found;
TestJSArrayForAllocationMemento(receiver_reg, scratch_reg,
&no_memento_found);
j(equal, memento_found);
bind(&no_memento_found);
}
// Jumps to found label if a prototype map has dictionary elements.
void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0,
Register scratch1, Label* found);
private:
bool generating_stub_;
bool has_frame_;
// This handle will be patched with the code object on installation.
Handle<Object> code_object_;
// Helper functions for generating invokes.
void InvokePrologue(const ParameterCount& expected,
const ParameterCount& actual,
Handle<Code> code_constant,
const Operand& code_operand,
Label* done,
bool* definitely_mismatches,
InvokeFlag flag,
Label::Distance done_distance,
const CallWrapper& call_wrapper = NullCallWrapper());
void EnterExitFramePrologue();
void EnterExitFrameEpilogue(int argc, bool save_doubles);
void LeaveExitFrameEpilogue(bool restore_context);
// Allocation support helpers.
void LoadAllocationTopHelper(Register result,
Register scratch,
AllocationFlags flags);
void UpdateAllocationTopHelper(Register result_end,
Register scratch,
AllocationFlags flags);
// Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
void InNewSpace(Register object,
Register scratch,
Condition cc,
Label* condition_met,
Label::Distance condition_met_distance = Label::kFar);
// Helper for finding the mark bits for an address. Afterwards, the
// bitmap register points at the word with the mark bits and the mask
// the position of the first bit. Uses ecx as scratch and leaves addr_reg
// unchanged.
inline void GetMarkBits(Register addr_reg,
Register bitmap_reg,
Register mask_reg);
// Compute memory operands for safepoint stack slots.
Operand SafepointRegisterSlot(Register reg);
static int SafepointRegisterStackIndex(int reg_code);
// Needs access to SafepointRegisterStackIndex for compiled frame
// traversal.
friend class StandardFrame;
};
// The code patcher is used to patch (typically) small parts of code e.g. for
// debugging and other types of instrumentation. When using the code patcher
// the exact number of bytes specified must be emitted. Is not legal to emit
// relocation information. If any of these constraints are violated it causes
// an assertion.
class CodePatcher {
public:
CodePatcher(byte* address, int size);
~CodePatcher();
// Macro assembler to emit code.
MacroAssembler* masm() { return &masm_; }
private:
byte* address_; // The address of the code being patched.
int size_; // Number of bytes of the expected patch size.
MacroAssembler masm_; // Macro assembler used to generate the code.
};
// -----------------------------------------------------------------------------
// Static helper functions.
// Generate an Operand for loading a field from an object.
inline Operand FieldOperand(Register object, int offset) {
return Operand(object, offset - kHeapObjectTag);
}
// Generate an Operand for loading an indexed field from an object.
inline Operand FieldOperand(Register object,
Register index,
ScaleFactor scale,
int offset) {
return Operand(object, index, scale, offset - kHeapObjectTag);
}
inline Operand FixedArrayElementOperand(Register array,
Register index_as_smi,
int additional_offset = 0) {
int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize;
return FieldOperand(array, index_as_smi, times_half_pointer_size, offset);
}
inline Operand ContextOperand(Register context, int index) {
return Operand(context, Context::SlotOffset(index));
}
inline Operand ContextOperand(Register context, Register index) {
return Operand(context, index, times_pointer_size, Context::SlotOffset(0));
}
inline Operand GlobalObjectOperand() {
return ContextOperand(esi, Context::GLOBAL_OBJECT_INDEX);
}
#ifdef GENERATED_CODE_COVERAGE
extern void LogGeneratedCodeCoverage(const char* file_line);
#define CODE_COVERAGE_STRINGIFY(x) #x
#define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
#define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
#define ACCESS_MASM(masm) { \
byte* ia32_coverage_function = \
reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \
masm->pushfd(); \
masm->pushad(); \
masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \
masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \
masm->pop(eax); \
masm->popad(); \
masm->popfd(); \
} \
masm->
#else
#define ACCESS_MASM(masm) masm->
#endif
} // namespace internal
} // namespace v8
#endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_
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