Contribution of PowerPC port.

src/ppc/deoptimizer-ppc.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
+//
+// Copyright IBM Corp. 2012, 2013. 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/v8.h"
 
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen.h"
 #include "src/safepoint-table.h"
 
 namespace v8 {
 namespace internal {
 
 const int Deoptimizer::table_entry_size_ = 8;
 
 
 int Deoptimizer::patch_size() {
-  const int kCallInstructionSizeInWords = 3;
+#if V8_TARGET_ARCH_PPC64
+  const int kCallInstructionSizeInWords = 7;
+#else
+  const int kCallInstructionSizeInWords = 4;
+#endif
   return kCallInstructionSizeInWords * Assembler::kInstrSize;
 }
 
 
 void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) {
   Address code_start_address = code->instruction_start();
+
   // Invalidate the relocation information, as it will become invalid by the
   // code patching below, and is not needed any more.
   code->InvalidateRelocation();
 
   if (FLAG_zap_code_space) {
     // Fail hard and early if we enter this code object again.
     byte* pointer = code->FindCodeAgeSequence();
     if (pointer != NULL) {
       pointer += kNoCodeAgeSequenceLength;
     } else {
@@ skipping 17 matching lines @@
   Address prev_call_address = NULL;
 #endif
   // For each LLazyBailout instruction insert a call to the corresponding
   // deoptimization entry.
   for (int i = 0; i < deopt_data->DeoptCount(); i++) {
     if (deopt_data->Pc(i)->value() == -1) continue;
     Address call_address = code_start_address + deopt_data->Pc(i)->value();
     Address deopt_entry = GetDeoptimizationEntry(isolate, i, LAZY);
     // We need calls to have a predictable size in the unoptimized code, but
     // this is optimized code, so we don't have to have a predictable size.
-    int call_size_in_bytes =
-        MacroAssembler::CallSizeNotPredictableCodeSize(isolate,
-                                                       deopt_entry,
-                                                       RelocInfo::NONE32);
+    int call_size_in_bytes = MacroAssembler::CallSizeNotPredictableCodeSize(
+        deopt_entry, kRelocInfo_NONEPTR);
     int call_size_in_words = call_size_in_bytes / Assembler::kInstrSize;
     DCHECK(call_size_in_bytes % Assembler::kInstrSize == 0);
     DCHECK(call_size_in_bytes <= patch_size());
     CodePatcher patcher(call_address, call_size_in_words);
-    patcher.masm()->Call(deopt_entry, RelocInfo::NONE32);
+    patcher.masm()->Call(deopt_entry, kRelocInfo_NONEPTR);
     DCHECK(prev_call_address == NULL ||
            call_address >= prev_call_address + patch_size());
     DCHECK(call_address + patch_size() <= code->instruction_end());
 #ifdef DEBUG
     prev_call_address = call_address;
 #endif
   }
 }
 
 
 void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) {
   // Set the register values. The values are not important as there are no
   // callee saved registers in JavaScript frames, so all registers are
   // spilled. Registers fp and sp are set to the correct values though.
 
   for (int i = 0; i < Register::kNumRegisters; i++) {
     input_->SetRegister(i, i * 4);
   }
   input_->SetRegister(sp.code(), reinterpret_cast<intptr_t>(frame->sp()));
   input_->SetRegister(fp.code(), reinterpret_cast<intptr_t>(frame->fp()));
   for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); i++) {
     input_->SetDoubleRegister(i, 0.0);
   }
 
   // Fill the frame content from the actual data on the frame.
   for (unsigned i = 0; i < input_->GetFrameSize(); i += kPointerSize) {
-    input_->SetFrameSlot(i, Memory::uint32_at(tos + i));
+    input_->SetFrameSlot(
+        i, reinterpret_cast<intptr_t>(Memory::Address_at(tos + i)));
   }
 }
 
 
 void Deoptimizer::SetPlatformCompiledStubRegisters(
     FrameDescription* output_frame, CodeStubInterfaceDescriptor* descriptor) {
   ApiFunction function(descriptor->deoptimization_handler());
   ExternalReference xref(&function, ExternalReference::BUILTIN_CALL, isolate_);
   intptr_t handler = reinterpret_cast<intptr_t>(xref.address());
   int params = descriptor->GetHandlerParameterCount();
-  output_frame->SetRegister(r0.code(), params);
-  output_frame->SetRegister(r1.code(), handler);
+  output_frame->SetRegister(r3.code(), params);
+  output_frame->SetRegister(r4.code(), handler);
 }
 
 
 void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) {
-  for (int i = 0; i < DwVfpRegister::kMaxNumRegisters; ++i) {
+  for (int i = 0; i < DoubleRegister::kMaxNumRegisters; ++i) {
     double double_value = input_->GetDoubleRegister(i);
     output_frame->SetDoubleRegister(i, double_value);
   }
 }
 
 
 bool Deoptimizer::HasAlignmentPadding(JSFunction* function) {
-  // There is no dynamic alignment padding on ARM in the input frame.
+  // There is no dynamic alignment padding on PPC in the input frame.
   return false;
 }
 
 
 #define __ masm()->
 
 // This code tries to be close to ia32 code so that any changes can be
 // easily ported.
 void Deoptimizer::EntryGenerator::Generate() {
   GeneratePrologue();
 
-  // Save all general purpose registers before messing with them.
+  // Unlike on ARM we don't save all the registers, just the useful ones.
+  // For the rest, there are gaps on the stack, so the offsets remain the same.
   const int kNumberOfRegisters = Register::kNumRegisters;
 
-  // Everything but pc, lr and ip which will be saved but not restored.
-  RegList restored_regs = kJSCallerSaved | kCalleeSaved | ip.bit();
+  RegList restored_regs = kJSCallerSaved | kCalleeSaved;
+  RegList saved_regs = restored_regs | sp.bit();
 
   const int kDoubleRegsSize =
-      kDoubleSize * DwVfpRegister::kMaxNumAllocatableRegisters;
+      kDoubleSize * DoubleRegister::kMaxNumAllocatableRegisters;
 
-  // Save all allocatable VFP registers before messing with them.
-  DCHECK(kDoubleRegZero.code() == 14);
-  DCHECK(kScratchDoubleReg.code() == 15);
+  // Save all FPU registers before messing with them.
+  __ subi(sp, sp, Operand(kDoubleRegsSize));
+  for (int i = 0; i < DoubleRegister::kMaxNumAllocatableRegisters; ++i) {
+    DoubleRegister fpu_reg = DoubleRegister::FromAllocationIndex(i);
+    int offset = i * kDoubleSize;
+    __ stfd(fpu_reg, MemOperand(sp, offset));
+  }
 
-  // Check CPU flags for number of registers, setting the Z condition flag.
-  __ CheckFor32DRegs(ip);
-
-  // Push registers d0-d13, and possibly d16-d31, on the stack.
-  // If d16-d31 are not pushed, decrease the stack pointer instead.
-  __ vstm(db_w, sp, d16, d31, ne);
-  __ sub(sp, sp, Operand(16 * kDoubleSize), LeaveCC, eq);
-  __ vstm(db_w, sp, d0, d13);
-
-  // Push all 16 registers (needed to populate FrameDescription::registers_).
-  // TODO(1588) Note that using pc with stm is deprecated, so we should perhaps
-  // handle this a bit differently.
-  __ stm(db_w, sp, restored_regs  | sp.bit() | lr.bit() | pc.bit());
+  // Push saved_regs (needed to populate FrameDescription::registers_).
+  // Leave gaps for other registers.
+  __ subi(sp, sp, Operand(kNumberOfRegisters * kPointerSize));
+  for (int16_t i = kNumberOfRegisters - 1; i >= 0; i--) {
+    if ((saved_regs & (1 << i)) != 0) {
+      __ StoreP(ToRegister(i), MemOperand(sp, kPointerSize * i));
+    }
+  }
 
   const int kSavedRegistersAreaSize =
       (kNumberOfRegisters * kPointerSize) + kDoubleRegsSize;
 
   // Get the bailout id from the stack.
-  __ ldr(r2, MemOperand(sp, kSavedRegistersAreaSize));
+  __ LoadP(r5, MemOperand(sp, kSavedRegistersAreaSize));
 
-  // Get the address of the location in the code object (r3) (return
+  // Get the address of the location in the code object (r6) (return
   // address for lazy deoptimization) and compute the fp-to-sp delta in
-  // register r4.
-  __ mov(r3, lr);
+  // register r7.
+  __ mflr(r6);
   // Correct one word for bailout id.
-  __ add(r4, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
-  __ sub(r4, fp, r4);
+  __ addi(r7, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
+  __ sub(r7, fp, r7);
 
   // Allocate a new deoptimizer object.
-  // Pass four arguments in r0 to r3 and fifth argument on stack.
-  __ PrepareCallCFunction(6, r5);
-  __ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  __ mov(r1, Operand(type()));  // bailout type,
-  // r2: bailout id already loaded.
-  // r3: code address or 0 already loaded.
-  __ str(r4, MemOperand(sp, 0 * kPointerSize));  // Fp-to-sp delta.
-  __ mov(r5, Operand(ExternalReference::isolate_address(isolate())));
-  __ str(r5, MemOperand(sp, 1 * kPointerSize));  // Isolate.
+  // Pass six arguments in r3 to r8.
+  __ PrepareCallCFunction(6, r8);
+  __ LoadP(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ li(r4, Operand(type()));  // bailout type,
+  // r5: bailout id already loaded.
+  // r6: code address or 0 already loaded.
+  // r7: Fp-to-sp delta.
+  __ mov(r8, Operand(ExternalReference::isolate_address(isolate())));
   // Call Deoptimizer::New().
   {
     AllowExternalCallThatCantCauseGC scope(masm());
     __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6);
   }
 
-  // Preserve "deoptimizer" object in register r0 and get the input
-  // frame descriptor pointer to r1 (deoptimizer->input_);
-  __ ldr(r1, MemOperand(r0, Deoptimizer::input_offset()));
+  // Preserve "deoptimizer" object in register r3 and get the input
+  // frame descriptor pointer to r4 (deoptimizer->input_);
+  __ LoadP(r4, MemOperand(r3, Deoptimizer::input_offset()));
 
   // Copy core registers into FrameDescription::registers_[kNumRegisters].
   DCHECK(Register::kNumRegisters == kNumberOfRegisters);
   for (int i = 0; i < kNumberOfRegisters; i++) {
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
-    __ ldr(r2, MemOperand(sp, i * kPointerSize));
-    __ str(r2, MemOperand(r1, offset));
+    __ LoadP(r5, MemOperand(sp, i * kPointerSize));
+    __ StoreP(r5, MemOperand(r4, offset));
   }
 
+  int double_regs_offset = FrameDescription::double_registers_offset();
   // Copy VFP registers to
-  // double_registers_[DoubleRegister::kMaxNumAllocatableRegisters]
-  int double_regs_offset = FrameDescription::double_registers_offset();
-  for (int i = 0; i < DwVfpRegister::kMaxNumAllocatableRegisters; ++i) {
+  // double_registers_[DoubleRegister::kNumAllocatableRegisters]
+  for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); ++i) {
     int dst_offset = i * kDoubleSize + double_regs_offset;
     int src_offset = i * kDoubleSize + kNumberOfRegisters * kPointerSize;
-    __ vldr(d0, sp, src_offset);
-    __ vstr(d0, r1, dst_offset);
+    __ lfd(d0, MemOperand(sp, src_offset));
+    __ stfd(d0, MemOperand(r4, dst_offset));
   }
 
   // Remove the bailout id and the saved registers from the stack.
-  __ add(sp, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
+  __ addi(sp, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
 
-  // Compute a pointer to the unwinding limit in register r2; that is
+  // Compute a pointer to the unwinding limit in register r5; that is
   // the first stack slot not part of the input frame.
-  __ ldr(r2, MemOperand(r1, FrameDescription::frame_size_offset()));
-  __ add(r2, r2, sp);
+  __ LoadP(r5, MemOperand(r4, FrameDescription::frame_size_offset()));
+  __ add(r5, r5, sp);
 
   // Unwind the stack down to - but not including - the unwinding
   // limit and copy the contents of the activation frame to the input
   // frame description.
-  __ add(r3,  r1, Operand(FrameDescription::frame_content_offset()));
+  __ addi(r6, r4, Operand(FrameDescription::frame_content_offset()));
   Label pop_loop;
   Label pop_loop_header;
   __ b(&pop_loop_header);
   __ bind(&pop_loop);
-  __ pop(r4);
-  __ str(r4, MemOperand(r3, 0));
-  __ add(r3, r3, Operand(sizeof(uint32_t)));
+  __ pop(r7);
+  __ StoreP(r7, MemOperand(r6, 0));
+  __ addi(r6, r6, Operand(kPointerSize));
   __ bind(&pop_loop_header);
-  __ cmp(r2, sp);
-  __ b(ne, &pop_loop);
+  __ cmp(r5, sp);
+  __ bne(&pop_loop);
 
   // Compute the output frame in the deoptimizer.
-  __ push(r0);  // Preserve deoptimizer object across call.
-  // r0: deoptimizer object; r1: scratch.
-  __ PrepareCallCFunction(1, r1);
+  __ push(r3);  // Preserve deoptimizer object across call.
+  // r3: deoptimizer object; r4: scratch.
+  __ PrepareCallCFunction(1, r4);
   // Call Deoptimizer::ComputeOutputFrames().
   {
     AllowExternalCallThatCantCauseGC scope(masm());
     __ CallCFunction(
         ExternalReference::compute_output_frames_function(isolate()), 1);
   }
-  __ pop(r0);  // Restore deoptimizer object (class Deoptimizer).
+  __ pop(r3);  // Restore deoptimizer object (class Deoptimizer).
 
   // Replace the current (input) frame with the output frames.
-  Label outer_push_loop, inner_push_loop,
-      outer_loop_header, inner_loop_header;
-  // Outer loop state: r4 = current "FrameDescription** output_",
-  // r1 = one past the last FrameDescription**.
-  __ ldr(r1, MemOperand(r0, Deoptimizer::output_count_offset()));
-  __ ldr(r4, MemOperand(r0, Deoptimizer::output_offset()));  // r4 is output_.
-  __ add(r1, r4, Operand(r1, LSL, 2));
-  __ jmp(&outer_loop_header);
+  Label outer_push_loop, inner_push_loop, outer_loop_header, inner_loop_header;
+  // Outer loop state: r7 = current "FrameDescription** output_",
+  // r4 = one past the last FrameDescription**.
+  __ lwz(r4, MemOperand(r3, Deoptimizer::output_count_offset()));
+  __ LoadP(r7, MemOperand(r3, Deoptimizer::output_offset()));  // r7 is output_.
+  __ ShiftLeftImm(r4, r4, Operand(kPointerSizeLog2));
+  __ add(r4, r7, r4);
+  __ b(&outer_loop_header);
+
   __ bind(&outer_push_loop);
-  // Inner loop state: r2 = current FrameDescription*, r3 = loop index.
-  __ ldr(r2, MemOperand(r4, 0));  // output_[ix]
-  __ ldr(r3, MemOperand(r2, FrameDescription::frame_size_offset()));
-  __ jmp(&inner_loop_header);
+  // Inner loop state: r5 = current FrameDescription*, r6 = loop index.
+  __ LoadP(r5, MemOperand(r7, 0));  // output_[ix]
+  __ LoadP(r6, MemOperand(r5, FrameDescription::frame_size_offset()));
+  __ b(&inner_loop_header);
+
   __ bind(&inner_push_loop);
-  __ sub(r3, r3, Operand(sizeof(uint32_t)));
-  __ add(r6, r2, Operand(r3));
-  __ ldr(r6, MemOperand(r6, FrameDescription::frame_content_offset()));
-  __ push(r6);
+  __ addi(r6, r6, Operand(-sizeof(intptr_t)));
+  __ add(r9, r5, r6);
+  __ LoadP(r9, MemOperand(r9, FrameDescription::frame_content_offset()));
+  __ push(r9);
+
   __ bind(&inner_loop_header);
-  __ cmp(r3, Operand::Zero());
-  __ b(ne, &inner_push_loop);  // test for gt?
-  __ add(r4, r4, Operand(kPointerSize));
+  __ cmpi(r6, Operand::Zero());
+  __ bne(&inner_push_loop);  // test for gt?
+
+  __ addi(r7, r7, Operand(kPointerSize));
   __ bind(&outer_loop_header);
-  __ cmp(r4, r1);
-  __ b(lt, &outer_push_loop);
+  __ cmp(r7, r4);
+  __ blt(&outer_push_loop);
 
-  // Check CPU flags for number of registers, setting the Z condition flag.
-  __ CheckFor32DRegs(ip);
-
-  __ ldr(r1, MemOperand(r0, Deoptimizer::input_offset()));
-  int src_offset = FrameDescription::double_registers_offset();
-  for (int i = 0; i < DwVfpRegister::kMaxNumRegisters; ++i) {
-    if (i == kDoubleRegZero.code()) continue;
-    if (i == kScratchDoubleReg.code()) continue;
-
-    const DwVfpRegister reg = DwVfpRegister::from_code(i);
-    __ vldr(reg, r1, src_offset, i < 16 ? al : ne);
-    src_offset += kDoubleSize;
+  __ LoadP(r4, MemOperand(r3, Deoptimizer::input_offset()));
+  for (int i = 0; i < DoubleRegister::kMaxNumAllocatableRegisters; ++i) {
+    const DoubleRegister dreg = DoubleRegister::FromAllocationIndex(i);
+    int src_offset = i * kDoubleSize + double_regs_offset;
+    __ lfd(dreg, MemOperand(r4, src_offset));
   }
 
   // Push state, pc, and continuation from the last output frame.
-  __ ldr(r6, MemOperand(r2, FrameDescription::state_offset()));
-  __ push(r6);
-  __ ldr(r6, MemOperand(r2, FrameDescription::pc_offset()));
-  __ push(r6);
-  __ ldr(r6, MemOperand(r2, FrameDescription::continuation_offset()));
-  __ push(r6);
+  __ LoadP(r9, MemOperand(r5, FrameDescription::state_offset()));
+  __ push(r9);
+  __ LoadP(r9, MemOperand(r5, FrameDescription::pc_offset()));
+  __ push(r9);
+  __ LoadP(r9, MemOperand(r5, FrameDescription::continuation_offset()));
+  __ push(r9);
 
-  // Push the registers from the last output frame.
+  // Restore the registers from the last output frame.
+  DCHECK(!(ip.bit() & restored_regs));
+  __ mr(ip, r5);
   for (int i = kNumberOfRegisters - 1; i >= 0; i--) {
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
-    __ ldr(r6, MemOperand(r2, offset));
-    __ push(r6);
+    if ((restored_regs & (1 << i)) != 0) {
+      __ LoadP(ToRegister(i), MemOperand(ip, offset));
+    }
   }
 
-  // Restore the registers from the stack.
-  __ ldm(ia_w, sp, restored_regs);  // all but pc registers.
-  __ pop(ip);  // remove sp
-  __ pop(ip);  // remove lr
-
   __ InitializeRootRegister();
 
-  __ pop(ip);  // remove pc
   __ pop(ip);  // get continuation, leave pc on stack
-  __ pop(lr);
+  __ pop(r0);
+  __ mtlr(r0);
   __ Jump(ip);
   __ stop("Unreachable.");
 }
 
 
 void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
+  Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm());
+
   // Create a sequence of deoptimization entries.
   // Note that registers are still live when jumping to an entry.
   Label done;
   for (int i = 0; i < count(); i++) {
     int start = masm()->pc_offset();
     USE(start);
-    __ mov(ip, Operand(i));
+    __ li(ip, Operand(i));
     __ b(&done);
     DCHECK(masm()->pc_offset() - start == table_entry_size_);
   }
   __ bind(&done);
   __ push(ip);
 }
 
 
 void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
   SetFrameSlot(offset, value);
 }
 
 
 void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
   SetFrameSlot(offset, value);
 }
 
 
 void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
+#if V8_OOL_CONSTANT_POOL
   DCHECK(FLAG_enable_ool_constant_pool);
   SetFrameSlot(offset, value);
+#else
+  // No out-of-line constant pool support.
+  UNREACHABLE();
+#endif
 }
 
 
 #undef __
-
-} }  // namespace v8::internal
+}
+}  // namespace v8::internal