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Unified Diff: src/compiler/ia32/code-generator-ia32.cc

Issue 426233002: Land the Fan (disabled) (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Review feedback, rebase and "git cl format" Created 6 years, 5 months ago
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Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
new file mode 100644
index 0000000000000000000000000000000000000000..38f7d4b0c100f51c1e464786cb57f35df22d18a6
--- /dev/null
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -0,0 +1,929 @@
+// Copyright 2013 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.
+
+#include "src/compiler/code-generator.h"
+
+#include "src/compiler/code-generator-impl.h"
+#include "src/compiler/gap-resolver.h"
+#include "src/compiler/node-matchers.h"
+#include "src/compiler/node-properties-inl.h"
+#include "src/ia32/assembler-ia32.h"
+#include "src/ia32/macro-assembler-ia32.h"
+#include "src/scopes.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+#define __ masm()->
+
+
+// Adds IA-32 specific methods for decoding operands.
+class IA32OperandConverter : public InstructionOperandConverter {
+ public:
+ IA32OperandConverter(CodeGenerator* gen, Instruction* instr)
+ : InstructionOperandConverter(gen, instr) {}
+
+ Operand InputOperand(int index) { return ToOperand(instr_->InputAt(index)); }
+
+ Immediate InputImmediate(int index) {
+ return ToImmediate(instr_->InputAt(index));
+ }
+
+ Operand OutputOperand() { return ToOperand(instr_->Output()); }
+
+ Operand TempOperand(int index) { return ToOperand(instr_->TempAt(index)); }
+
+ Operand ToOperand(InstructionOperand* op, int extra = 0) {
+ if (op->IsRegister()) {
+ ASSERT(extra == 0);
+ return Operand(ToRegister(op));
+ } else if (op->IsDoubleRegister()) {
+ ASSERT(extra == 0);
+ return Operand(ToDoubleRegister(op));
+ }
+ ASSERT(op->IsStackSlot() || op->IsDoubleStackSlot());
+ // The linkage computes where all spill slots are located.
+ FrameOffset offset = linkage()->GetFrameOffset(op->index(), frame(), extra);
+ return Operand(offset.from_stack_pointer() ? esp : ebp, offset.offset());
+ }
+
+ Operand HighOperand(InstructionOperand* op) {
+ ASSERT(op->IsDoubleStackSlot());
+ return ToOperand(op, kPointerSize);
+ }
+
+ Immediate ToImmediate(InstructionOperand* operand) {
+ Constant constant = ToConstant(operand);
+ switch (constant.type()) {
+ case Constant::kInt32:
+ return Immediate(constant.ToInt32());
+ case Constant::kFloat64:
+ return Immediate(
+ isolate()->factory()->NewNumber(constant.ToFloat64(), TENURED));
+ case Constant::kExternalReference:
+ return Immediate(constant.ToExternalReference());
+ case Constant::kHeapObject:
+ return Immediate(constant.ToHeapObject());
+ case Constant::kInt64:
+ break;
+ }
+ UNREACHABLE();
+ return Immediate(-1);
+ }
+
+ Operand MemoryOperand(int* first_input) {
+ const int offset = *first_input;
+ switch (AddressingModeField::decode(instr_->opcode())) {
+ case kMode_MR1I:
+ *first_input += 2;
+ return Operand(InputRegister(offset + 0), InputRegister(offset + 1),
+ times_1,
+ 0); // TODO(dcarney): K != 0
+ case kMode_MRI:
+ *first_input += 2;
+ return Operand::ForRegisterPlusImmediate(InputRegister(offset + 0),
+ InputImmediate(offset + 1));
+ case kMode_MI:
+ *first_input += 1;
+ return Operand(InputImmediate(offset + 0));
+ default:
+ UNREACHABLE();
+ return Operand(no_reg);
+ }
+ }
+
+ Operand MemoryOperand() {
+ int first_input = 0;
+ return MemoryOperand(&first_input);
+ }
+};
+
+
+static bool HasImmediateInput(Instruction* instr, int index) {
+ return instr->InputAt(index)->IsImmediate();
+}
+
+
+// Assembles an instruction after register allocation, producing machine code.
+void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
+ IA32OperandConverter i(this, instr);
+
+ switch (ArchOpcodeField::decode(instr->opcode())) {
+ case kArchJmp:
+ __ jmp(code()->GetLabel(i.InputBlock(0)));
+ break;
+ case kArchNop:
+ // don't emit code for nops.
+ break;
+ case kArchRet:
+ AssembleReturn();
+ break;
+ case kArchDeoptimize: {
+ int deoptimization_id = MiscField::decode(instr->opcode());
+ BuildTranslation(instr, deoptimization_id);
+
+ Address deopt_entry = Deoptimizer::GetDeoptimizationEntry(
+ isolate(), deoptimization_id, Deoptimizer::LAZY);
+ __ call(deopt_entry, RelocInfo::RUNTIME_ENTRY);
+ break;
+ }
+ case kIA32Add:
+ if (HasImmediateInput(instr, 1)) {
+ __ add(i.InputOperand(0), i.InputImmediate(1));
+ } else {
+ __ add(i.InputRegister(0), i.InputOperand(1));
+ }
+ break;
+ case kIA32And:
+ if (HasImmediateInput(instr, 1)) {
+ __ and_(i.InputOperand(0), i.InputImmediate(1));
+ } else {
+ __ and_(i.InputRegister(0), i.InputOperand(1));
+ }
+ break;
+ case kIA32Cmp:
+ if (HasImmediateInput(instr, 1)) {
+ __ cmp(i.InputOperand(0), i.InputImmediate(1));
+ } else {
+ __ cmp(i.InputRegister(0), i.InputOperand(1));
+ }
+ break;
+ case kIA32Test:
+ if (HasImmediateInput(instr, 1)) {
+ __ test(i.InputOperand(0), i.InputImmediate(1));
+ } else {
+ __ test(i.InputRegister(0), i.InputOperand(1));
+ }
+ break;
+ case kIA32Imul:
+ if (HasImmediateInput(instr, 1)) {
+ __ imul(i.OutputRegister(), i.InputOperand(0), i.InputInt32(1));
+ } else {
+ __ imul(i.OutputRegister(), i.InputOperand(1));
+ }
+ break;
+ case kIA32Idiv:
+ __ cdq();
+ __ idiv(i.InputOperand(1));
+ break;
+ case kIA32Udiv:
+ __ xor_(edx, edx);
+ __ div(i.InputOperand(1));
+ break;
+ case kIA32Not:
+ __ not_(i.OutputOperand());
+ break;
+ case kIA32Neg:
+ __ neg(i.OutputOperand());
+ break;
+ case kIA32Or:
+ if (HasImmediateInput(instr, 1)) {
+ __ or_(i.InputOperand(0), i.InputImmediate(1));
+ } else {
+ __ or_(i.InputRegister(0), i.InputOperand(1));
+ }
+ break;
+ case kIA32Xor:
+ if (HasImmediateInput(instr, 1)) {
+ __ xor_(i.InputOperand(0), i.InputImmediate(1));
+ } else {
+ __ xor_(i.InputRegister(0), i.InputOperand(1));
+ }
+ break;
+ case kIA32Sub:
+ if (HasImmediateInput(instr, 1)) {
+ __ sub(i.InputOperand(0), i.InputImmediate(1));
+ } else {
+ __ sub(i.InputRegister(0), i.InputOperand(1));
+ }
+ break;
+ case kIA32Shl:
+ if (HasImmediateInput(instr, 1)) {
+ __ shl(i.OutputRegister(), i.InputInt5(1));
+ } else {
+ __ shl_cl(i.OutputRegister());
+ }
+ break;
+ case kIA32Shr:
+ if (HasImmediateInput(instr, 1)) {
+ __ shr(i.OutputRegister(), i.InputInt5(1));
+ } else {
+ __ shr_cl(i.OutputRegister());
+ }
+ break;
+ case kIA32Sar:
+ if (HasImmediateInput(instr, 1)) {
+ __ sar(i.OutputRegister(), i.InputInt5(1));
+ } else {
+ __ sar_cl(i.OutputRegister());
+ }
+ break;
+ case kIA32Push:
+ if (HasImmediateInput(instr, 0)) {
+ __ push(i.InputImmediate(0));
+ } else {
+ __ push(i.InputOperand(0));
+ }
+ break;
+ case kIA32CallCodeObject: {
+ if (HasImmediateInput(instr, 0)) {
+ Handle<Code> code = Handle<Code>::cast(i.InputHeapObject(0));
+ __ call(code, RelocInfo::CODE_TARGET);
+ } else {
+ Register reg = i.InputRegister(0);
+ int entry = Code::kHeaderSize - kHeapObjectTag;
+ __ call(Operand(reg, entry));
+ }
+ RecordSafepoint(instr->pointer_map(), Safepoint::kSimple, 0,
+ Safepoint::kNoLazyDeopt);
+
+ bool lazy_deopt = (MiscField::decode(instr->opcode()) == 1);
+ if (lazy_deopt) {
+ RecordLazyDeoptimizationEntry(instr);
+ }
+ AddNopForSmiCodeInlining();
+ break;
+ }
+ case kIA32CallAddress:
+ if (HasImmediateInput(instr, 0)) {
+ // TODO(dcarney): wire up EXTERNAL_REFERENCE instead of RUNTIME_ENTRY.
+ __ call(reinterpret_cast<byte*>(i.InputInt32(0)),
+ RelocInfo::RUNTIME_ENTRY);
+ } else {
+ __ call(i.InputRegister(0));
+ }
+ break;
+ case kPopStack: {
+ int words = MiscField::decode(instr->opcode());
+ __ add(esp, Immediate(kPointerSize * words));
+ break;
+ }
+ case kIA32CallJSFunction: {
+ Register func = i.InputRegister(0);
+
+ // TODO(jarin) The load of the context should be separated from the call.
+ __ mov(esi, FieldOperand(func, JSFunction::kContextOffset));
+ __ call(FieldOperand(func, JSFunction::kCodeEntryOffset));
+
+ RecordSafepoint(instr->pointer_map(), Safepoint::kSimple, 0,
+ Safepoint::kNoLazyDeopt);
+ RecordLazyDeoptimizationEntry(instr);
+ break;
+ }
+ case kSSEFloat64Cmp:
+ __ ucomisd(i.InputDoubleRegister(0), i.InputOperand(1));
+ break;
+ case kSSEFloat64Add:
+ __ addsd(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
+ break;
+ case kSSEFloat64Sub:
+ __ subsd(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
+ break;
+ case kSSEFloat64Mul:
+ __ mulsd(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
+ break;
+ case kSSEFloat64Div:
+ __ divsd(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
+ break;
+ case kSSEFloat64Mod: {
+ // TODO(dcarney): alignment is wrong.
+ __ sub(esp, Immediate(kDoubleSize));
+ // Move values to st(0) and st(1).
+ __ movsd(Operand(esp, 0), i.InputDoubleRegister(1));
+ __ fld_d(Operand(esp, 0));
+ __ movsd(Operand(esp, 0), i.InputDoubleRegister(0));
+ __ fld_d(Operand(esp, 0));
+ // Loop while fprem isn't done.
+ Label mod_loop;
+ __ bind(&mod_loop);
+ // This instructions traps on all kinds inputs, but we are assuming the
+ // floating point control word is set to ignore them all.
+ __ fprem();
+ // The following 2 instruction implicitly use eax.
+ __ fnstsw_ax();
+ __ sahf();
+ __ j(parity_even, &mod_loop);
+ // Move output to stack and clean up.
+ __ fstp(1);
+ __ fstp_d(Operand(esp, 0));
+ __ movsd(i.OutputDoubleRegister(), Operand(esp, 0));
+ __ add(esp, Immediate(kDoubleSize));
+ break;
+ }
+ case kSSEFloat64ToInt32:
+ __ cvttsd2si(i.OutputRegister(), i.InputOperand(0));
+ break;
+ case kSSEInt32ToFloat64:
+ __ cvtsi2sd(i.OutputDoubleRegister(), i.InputOperand(0));
+ break;
+ case kSSELoad:
+ __ movsd(i.OutputDoubleRegister(), i.MemoryOperand());
+ break;
+ case kSSEStore: {
+ int index = 0;
+ Operand operand = i.MemoryOperand(&index);
+ __ movsd(operand, i.InputDoubleRegister(index));
+ break;
+ }
+ case kIA32LoadWord8:
+ __ movzx_b(i.OutputRegister(), i.MemoryOperand());
+ break;
+ case kIA32StoreWord8: {
+ int index = 0;
+ Operand operand = i.MemoryOperand(&index);
+ __ mov_b(operand, i.InputRegister(index));
+ break;
+ }
+ case kIA32StoreWord8I: {
+ int index = 0;
+ Operand operand = i.MemoryOperand(&index);
+ __ mov_b(operand, i.InputInt8(index));
+ break;
+ }
+ case kIA32LoadWord16:
+ __ movzx_w(i.OutputRegister(), i.MemoryOperand());
+ break;
+ case kIA32StoreWord16: {
+ int index = 0;
+ Operand operand = i.MemoryOperand(&index);
+ __ mov_w(operand, i.InputRegister(index));
+ break;
+ }
+ case kIA32StoreWord16I: {
+ int index = 0;
+ Operand operand = i.MemoryOperand(&index);
+ __ mov_w(operand, i.InputInt16(index));
+ break;
+ }
+ case kIA32LoadWord32:
+ __ mov(i.OutputRegister(), i.MemoryOperand());
+ break;
+ case kIA32StoreWord32: {
+ int index = 0;
+ Operand operand = i.MemoryOperand(&index);
+ __ mov(operand, i.InputRegister(index));
+ break;
+ }
+ case kIA32StoreWord32I: {
+ int index = 0;
+ Operand operand = i.MemoryOperand(&index);
+ __ mov(operand, i.InputImmediate(index));
+ break;
+ }
+ case kIA32StoreWriteBarrier: {
+ Register object = i.InputRegister(0);
+ Register index = i.InputRegister(1);
+ Register value = i.InputRegister(2);
+ __ mov(Operand(object, index, times_1, 0), value);
+ __ lea(index, Operand(object, index, times_1, 0));
+ SaveFPRegsMode mode = code_->frame()->DidAllocateDoubleRegisters()
+ ? kSaveFPRegs
+ : kDontSaveFPRegs;
+ __ RecordWrite(object, index, value, mode);
+ break;
+ }
+ }
+}
+
+
+// Assembles branches after an instruction.
+void CodeGenerator::AssembleArchBranch(Instruction* instr,
+ FlagsCondition condition) {
+ IA32OperandConverter i(this, instr);
+ Label done;
+
+ // Emit a branch. The true and false targets are always the last two inputs
+ // to the instruction.
+ BasicBlock* tblock = i.InputBlock(instr->InputCount() - 2);
+ BasicBlock* fblock = i.InputBlock(instr->InputCount() - 1);
+ bool fallthru = IsNextInAssemblyOrder(fblock);
+ Label* tlabel = code()->GetLabel(tblock);
+ Label* flabel = fallthru ? &done : code()->GetLabel(fblock);
+ Label::Distance flabel_distance = fallthru ? Label::kNear : Label::kFar;
+ switch (condition) {
+ case kUnorderedEqual:
+ __ j(parity_even, flabel, flabel_distance);
+ // Fall through.
+ case kEqual:
+ __ j(equal, tlabel);
+ break;
+ case kUnorderedNotEqual:
+ __ j(parity_even, tlabel);
+ // Fall through.
+ case kNotEqual:
+ __ j(not_equal, tlabel);
+ break;
+ case kSignedLessThan:
+ __ j(less, tlabel);
+ break;
+ case kSignedGreaterThanOrEqual:
+ __ j(greater_equal, tlabel);
+ break;
+ case kSignedLessThanOrEqual:
+ __ j(less_equal, tlabel);
+ break;
+ case kSignedGreaterThan:
+ __ j(greater, tlabel);
+ break;
+ case kUnorderedLessThan:
+ __ j(parity_even, flabel, flabel_distance);
+ // Fall through.
+ case kUnsignedLessThan:
+ __ j(below, tlabel);
+ break;
+ case kUnorderedGreaterThanOrEqual:
+ __ j(parity_even, tlabel);
+ // Fall through.
+ case kUnsignedGreaterThanOrEqual:
+ __ j(above_equal, tlabel);
+ break;
+ case kUnorderedLessThanOrEqual:
+ __ j(parity_even, flabel, flabel_distance);
+ // Fall through.
+ case kUnsignedLessThanOrEqual:
+ __ j(below_equal, tlabel);
+ break;
+ case kUnorderedGreaterThan:
+ __ j(parity_even, tlabel);
+ // Fall through.
+ case kUnsignedGreaterThan:
+ __ j(above, tlabel);
+ break;
+ }
+ if (!fallthru) __ jmp(flabel, flabel_distance); // no fallthru to flabel.
+ __ bind(&done);
+}
+
+
+// Assembles boolean materializations after an instruction.
+void CodeGenerator::AssembleArchBoolean(Instruction* instr,
+ FlagsCondition condition) {
+ IA32OperandConverter i(this, instr);
+ Label done;
+
+ // Materialize a full 32-bit 1 or 0 value.
+ Label check;
+ Register reg = i.OutputRegister();
+ Condition cc = no_condition;
+ switch (condition) {
+ case kUnorderedEqual:
+ __ j(parity_odd, &check, Label::kNear);
+ __ mov(reg, Immediate(0));
+ __ jmp(&done, Label::kNear);
+ // Fall through.
+ case kEqual:
+ cc = equal;
+ break;
+ case kUnorderedNotEqual:
+ __ j(parity_odd, &check, Label::kNear);
+ __ mov(reg, Immediate(1));
+ __ jmp(&done, Label::kNear);
+ // Fall through.
+ case kNotEqual:
+ cc = not_equal;
+ break;
+ case kSignedLessThan:
+ cc = less;
+ break;
+ case kSignedGreaterThanOrEqual:
+ cc = greater_equal;
+ break;
+ case kSignedLessThanOrEqual:
+ cc = less_equal;
+ break;
+ case kSignedGreaterThan:
+ cc = greater;
+ break;
+ case kUnorderedLessThan:
+ __ j(parity_odd, &check, Label::kNear);
+ __ mov(reg, Immediate(0));
+ __ jmp(&done, Label::kNear);
+ // Fall through.
+ case kUnsignedLessThan:
+ cc = below;
+ break;
+ case kUnorderedGreaterThanOrEqual:
+ __ j(parity_odd, &check, Label::kNear);
+ __ mov(reg, Immediate(1));
+ __ jmp(&done, Label::kNear);
+ // Fall through.
+ case kUnsignedGreaterThanOrEqual:
+ cc = above_equal;
+ break;
+ case kUnorderedLessThanOrEqual:
+ __ j(parity_odd, &check, Label::kNear);
+ __ mov(reg, Immediate(0));
+ __ jmp(&done, Label::kNear);
+ // Fall through.
+ case kUnsignedLessThanOrEqual:
+ cc = below_equal;
+ break;
+ case kUnorderedGreaterThan:
+ __ j(parity_odd, &check, Label::kNear);
+ __ mov(reg, Immediate(1));
+ __ jmp(&done, Label::kNear);
+ // Fall through.
+ case kUnsignedGreaterThan:
+ cc = above;
+ break;
+ }
+ __ bind(&check);
+ if (reg.is_byte_register()) {
+ // setcc for byte registers (al, bl, cl, dl).
+ __ setcc(cc, reg);
+ __ movzx_b(reg, reg);
+ } else {
+ // Emit a branch to set a register to either 1 or 0.
+ Label set;
+ __ j(cc, &set, Label::kNear);
+ __ mov(reg, Immediate(0));
+ __ jmp(&done, Label::kNear);
+ __ bind(&set);
+ __ mov(reg, Immediate(1));
+ }
+ __ bind(&done);
+}
+
+
+// The calling convention for JSFunctions on IA32 passes arguments on the
+// stack and the JSFunction and context in EDI and ESI, respectively, thus
+// the steps of the call look as follows:
+
+// --{ before the call instruction }--------------------------------------------
+// | caller frame |
+// ^ esp ^ ebp
+
+// --{ push arguments and setup ESI, EDI }--------------------------------------
+// | args + receiver | caller frame |
+// ^ esp ^ ebp
+// [edi = JSFunction, esi = context]
+
+// --{ call [edi + kCodeEntryOffset] }------------------------------------------
+// | RET | args + receiver | caller frame |
+// ^ esp ^ ebp
+
+// =={ prologue of called function }============================================
+// --{ push ebp }---------------------------------------------------------------
+// | FP | RET | args + receiver | caller frame |
+// ^ esp ^ ebp
+
+// --{ mov ebp, esp }-----------------------------------------------------------
+// | FP | RET | args + receiver | caller frame |
+// ^ ebp,esp
+
+// --{ push esi }---------------------------------------------------------------
+// | CTX | FP | RET | args + receiver | caller frame |
+// ^esp ^ ebp
+
+// --{ push edi }---------------------------------------------------------------
+// | FNC | CTX | FP | RET | args + receiver | caller frame |
+// ^esp ^ ebp
+
+// --{ subi esp, #N }-----------------------------------------------------------
+// | callee frame | FNC | CTX | FP | RET | args + receiver | caller frame |
+// ^esp ^ ebp
+
+// =={ body of called function }================================================
+
+// =={ epilogue of called function }============================================
+// --{ mov esp, ebp }-----------------------------------------------------------
+// | FP | RET | args + receiver | caller frame |
+// ^ esp,ebp
+
+// --{ pop ebp }-----------------------------------------------------------
+// | | RET | args + receiver | caller frame |
+// ^ esp ^ ebp
+
+// --{ ret #A+1 }-----------------------------------------------------------
+// | | caller frame |
+// ^ esp ^ ebp
+
+
+// Runtime function calls are accomplished by doing a stub call to the
+// CEntryStub (a real code object). On IA32 passes arguments on the
+// stack, the number of arguments in EAX, the address of the runtime function
+// in EBX, and the context in ESI.
+
+// --{ before the call instruction }--------------------------------------------
+// | caller frame |
+// ^ esp ^ ebp
+
+// --{ push arguments and setup EAX, EBX, and ESI }-----------------------------
+// | args + receiver | caller frame |
+// ^ esp ^ ebp
+// [eax = #args, ebx = runtime function, esi = context]
+
+// --{ call #CEntryStub }-------------------------------------------------------
+// | RET | args + receiver | caller frame |
+// ^ esp ^ ebp
+
+// =={ body of runtime function }===============================================
+
+// --{ runtime returns }--------------------------------------------------------
+// | caller frame |
+// ^ esp ^ ebp
+
+// Other custom linkages (e.g. for calling directly into and out of C++) may
+// need to save callee-saved registers on the stack, which is done in the
+// function prologue of generated code.
+
+// --{ before the call instruction }--------------------------------------------
+// | caller frame |
+// ^ esp ^ ebp
+
+// --{ set up arguments in registers on stack }---------------------------------
+// | args | caller frame |
+// ^ esp ^ ebp
+// [r0 = arg0, r1 = arg1, ...]
+
+// --{ call code }--------------------------------------------------------------
+// | RET | args | caller frame |
+// ^ esp ^ ebp
+
+// =={ prologue of called function }============================================
+// --{ push ebp }---------------------------------------------------------------
+// | FP | RET | args | caller frame |
+// ^ esp ^ ebp
+
+// --{ mov ebp, esp }-----------------------------------------------------------
+// | FP | RET | args | caller frame |
+// ^ ebp,esp
+
+// --{ save registers }---------------------------------------------------------
+// | regs | FP | RET | args | caller frame |
+// ^ esp ^ ebp
+
+// --{ subi esp, #N }-----------------------------------------------------------
+// | callee frame | regs | FP | RET | args | caller frame |
+// ^esp ^ ebp
+
+// =={ body of called function }================================================
+
+// =={ epilogue of called function }============================================
+// --{ restore registers }------------------------------------------------------
+// | regs | FP | RET | args | caller frame |
+// ^ esp ^ ebp
+
+// --{ mov esp, ebp }-----------------------------------------------------------
+// | FP | RET | args | caller frame |
+// ^ esp,ebp
+
+// --{ pop ebp }----------------------------------------------------------------
+// | RET | args | caller frame |
+// ^ esp ^ ebp
+
+
+void CodeGenerator::AssemblePrologue() {
+ CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
+ Frame* frame = code_->frame();
+ int stack_slots = frame->GetSpillSlotCount();
+ if (descriptor->kind() == CallDescriptor::kCallAddress) {
+ // Assemble a prologue similar the to cdecl calling convention.
+ __ push(ebp);
+ __ mov(ebp, esp);
+ const RegList saves = descriptor->CalleeSavedRegisters();
+ if (saves != 0) { // Save callee-saved registers.
+ int register_save_area_size = 0;
+ for (int i = Register::kNumRegisters - 1; i >= 0; i--) {
+ if (!((1 << i) & saves)) continue;
+ __ push(Register::from_code(i));
+ register_save_area_size += kPointerSize;
+ }
+ frame->SetRegisterSaveAreaSize(register_save_area_size);
+ }
+ } else if (descriptor->IsJSFunctionCall()) {
+ CompilationInfo* info = linkage()->info();
+ __ Prologue(info->IsCodePreAgingActive());
+ frame->SetRegisterSaveAreaSize(
+ StandardFrameConstants::kFixedFrameSizeFromFp);
+
+ // Sloppy mode functions and builtins need to replace the receiver with the
+ // global proxy when called as functions (without an explicit receiver
+ // object).
+ // TODO(mstarzinger/verwaest): Should this be moved back into the CallIC?
+ if (info->strict_mode() == SLOPPY && !info->is_native()) {
+ Label ok;
+ // +2 for return address and saved frame pointer.
+ int receiver_slot = info->scope()->num_parameters() + 2;
+ __ mov(ecx, Operand(ebp, receiver_slot * kPointerSize));
+ __ cmp(ecx, isolate()->factory()->undefined_value());
+ __ j(not_equal, &ok, Label::kNear);
+ __ mov(ecx, GlobalObjectOperand());
+ __ mov(ecx, FieldOperand(ecx, GlobalObject::kGlobalProxyOffset));
+ __ mov(Operand(ebp, receiver_slot * kPointerSize), ecx);
+ __ bind(&ok);
+ }
+
+ } else {
+ __ StubPrologue();
+ frame->SetRegisterSaveAreaSize(
+ StandardFrameConstants::kFixedFrameSizeFromFp);
+ }
+ if (stack_slots > 0) {
+ __ sub(esp, Immediate(stack_slots * kPointerSize));
+ }
+}
+
+
+void CodeGenerator::AssembleReturn() {
+ CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
+ if (descriptor->kind() == CallDescriptor::kCallAddress) {
+ const RegList saves = descriptor->CalleeSavedRegisters();
+ if (frame()->GetRegisterSaveAreaSize() > 0) {
+ // Remove this frame's spill slots first.
+ int stack_slots = frame()->GetSpillSlotCount();
+ if (stack_slots > 0) {
+ __ add(esp, Immediate(stack_slots * kPointerSize));
+ }
+ // Restore registers.
+ if (saves != 0) {
+ for (int i = 0; i < Register::kNumRegisters; i++) {
+ if (!((1 << i) & saves)) continue;
+ __ pop(Register::from_code(i));
+ }
+ }
+ __ pop(ebp); // Pop caller's frame pointer.
+ __ ret(0);
+ } else {
+ // No saved registers.
+ __ mov(esp, ebp); // Move stack pointer back to frame pointer.
+ __ pop(ebp); // Pop caller's frame pointer.
+ __ ret(0);
+ }
+ } else {
+ __ mov(esp, ebp); // Move stack pointer back to frame pointer.
+ __ pop(ebp); // Pop caller's frame pointer.
+ int pop_count =
+ descriptor->IsJSFunctionCall() ? descriptor->ParameterCount() : 0;
+ __ ret(pop_count * kPointerSize);
+ }
+}
+
+
+void CodeGenerator::AssembleMove(InstructionOperand* source,
+ InstructionOperand* destination) {
+ IA32OperandConverter g(this, NULL);
+ // Dispatch on the source and destination operand kinds. Not all
+ // combinations are possible.
+ if (source->IsRegister()) {
+ ASSERT(destination->IsRegister() || destination->IsStackSlot());
+ Register src = g.ToRegister(source);
+ Operand dst = g.ToOperand(destination);
+ __ mov(dst, src);
+ } else if (source->IsStackSlot()) {
+ ASSERT(destination->IsRegister() || destination->IsStackSlot());
+ Operand src = g.ToOperand(source);
+ if (destination->IsRegister()) {
+ Register dst = g.ToRegister(destination);
+ __ mov(dst, src);
+ } else {
+ Operand dst = g.ToOperand(destination);
+ __ push(src);
+ __ pop(dst);
+ }
+ } else if (source->IsConstant()) {
+ Constant src_constant = g.ToConstant(source);
+ if (src_constant.type() == Constant::kHeapObject) {
+ Handle<HeapObject> src = src_constant.ToHeapObject();
+ if (destination->IsRegister()) {
+ Register dst = g.ToRegister(destination);
+ __ LoadHeapObject(dst, src);
+ } else {
+ ASSERT(destination->IsStackSlot());
+ Operand dst = g.ToOperand(destination);
+ AllowDeferredHandleDereference embedding_raw_address;
+ if (isolate()->heap()->InNewSpace(*src)) {
+ __ PushHeapObject(src);
+ __ pop(dst);
+ } else {
+ __ mov(dst, src);
+ }
+ }
+ } else if (destination->IsRegister()) {
+ Register dst = g.ToRegister(destination);
+ __ mov(dst, g.ToImmediate(source));
+ } else if (destination->IsStackSlot()) {
+ Operand dst = g.ToOperand(destination);
+ __ mov(dst, g.ToImmediate(source));
+ } else {
+ double v = g.ToDouble(source);
+ uint64_t int_val = BitCast<uint64_t, double>(v);
+ int32_t lower = static_cast<int32_t>(int_val);
+ int32_t upper = static_cast<int32_t>(int_val >> kBitsPerInt);
+ if (destination->IsDoubleRegister()) {
+ XMMRegister dst = g.ToDoubleRegister(destination);
+ __ Move(dst, v);
+ } else {
+ ASSERT(destination->IsDoubleStackSlot());
+ Operand dst0 = g.ToOperand(destination);
+ Operand dst1 = g.HighOperand(destination);
+ __ mov(dst0, Immediate(lower));
+ __ mov(dst1, Immediate(upper));
+ }
+ }
+ } else if (source->IsDoubleRegister()) {
+ XMMRegister src = g.ToDoubleRegister(source);
+ if (destination->IsDoubleRegister()) {
+ XMMRegister dst = g.ToDoubleRegister(destination);
+ __ movaps(dst, src);
+ } else {
+ ASSERT(destination->IsDoubleStackSlot());
+ Operand dst = g.ToOperand(destination);
+ __ movsd(dst, src);
+ }
+ } else if (source->IsDoubleStackSlot()) {
+ ASSERT(destination->IsDoubleRegister() || destination->IsDoubleStackSlot());
+ Operand src = g.ToOperand(source);
+ if (destination->IsDoubleRegister()) {
+ XMMRegister dst = g.ToDoubleRegister(destination);
+ __ movsd(dst, src);
+ } else {
+ // We rely on having xmm0 available as a fixed scratch register.
+ Operand dst = g.ToOperand(destination);
+ __ movsd(xmm0, src);
+ __ movsd(dst, xmm0);
+ }
+ } else {
+ UNREACHABLE();
+ }
+}
+
+
+void CodeGenerator::AssembleSwap(InstructionOperand* source,
+ InstructionOperand* destination) {
+ IA32OperandConverter g(this, NULL);
+ // Dispatch on the source and destination operand kinds. Not all
+ // combinations are possible.
+ if (source->IsRegister() && destination->IsRegister()) {
+ // Register-register.
+ Register src = g.ToRegister(source);
+ Register dst = g.ToRegister(destination);
+ __ xchg(dst, src);
+ } else if (source->IsRegister() && destination->IsStackSlot()) {
+ // Register-memory.
+ __ xchg(g.ToRegister(source), g.ToOperand(destination));
+ } else if (source->IsStackSlot() && destination->IsStackSlot()) {
+ // Memory-memory.
+ Operand src = g.ToOperand(source);
+ Operand dst = g.ToOperand(destination);
+ __ push(dst);
+ __ push(src);
+ __ pop(dst);
+ __ pop(src);
+ } else if (source->IsDoubleRegister() && destination->IsDoubleRegister()) {
+ // XMM register-register swap. We rely on having xmm0
+ // available as a fixed scratch register.
+ XMMRegister src = g.ToDoubleRegister(source);
+ XMMRegister dst = g.ToDoubleRegister(destination);
+ __ movaps(xmm0, src);
+ __ movaps(src, dst);
+ __ movaps(dst, xmm0);
+ } else if (source->IsDoubleRegister() && source->IsDoubleStackSlot()) {
+ // XMM register-memory swap. We rely on having xmm0
+ // available as a fixed scratch register.
+ XMMRegister reg = g.ToDoubleRegister(source);
+ Operand other = g.ToOperand(destination);
+ __ movsd(xmm0, other);
+ __ movsd(other, reg);
+ __ movaps(reg, xmm0);
+ } else if (source->IsDoubleStackSlot() && destination->IsDoubleStackSlot()) {
+ // Double-width memory-to-memory.
+ Operand src0 = g.ToOperand(source);
+ Operand src1 = g.HighOperand(source);
+ Operand dst0 = g.ToOperand(destination);
+ Operand dst1 = g.HighOperand(destination);
+ __ movsd(xmm0, dst0); // Save destination in xmm0.
+ __ push(src0); // Then use stack to copy source to destination.
+ __ pop(dst0);
+ __ push(src1);
+ __ pop(dst1);
+ __ movsd(src0, xmm0);
+ } else {
+ // No other combinations are possible.
+ UNREACHABLE();
+ }
+}
+
+
+void CodeGenerator::AddNopForSmiCodeInlining() { __ nop(); }
+
+#undef __
+
+#ifdef DEBUG
+
+// Checks whether the code between start_pc and end_pc is a no-op.
+bool CodeGenerator::IsNopForSmiCodeInlining(Handle<Code> code, int start_pc,
+ int end_pc) {
+ if (start_pc + 1 != end_pc) {
+ return false;
+ }
+ return *(code->instruction_start() + start_pc) ==
+ v8::internal::Assembler::kNopByte;
+}
+
+#endif // DEBUG
+}
+}
+} // namespace v8::internal::compiler
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