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// Copyright 2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "codegen-inl.h"
#include "register-allocator-inl.h"
#include "scopes.h"
namespace v8 {
namespace internal {
// -------------------------------------------------------------------------
// VirtualFrame implementation.
#define __ ACCESS_MASM(masm())
// On entry to a function, the virtual frame already contains the
// receiver and the parameters. All initial frame elements are in
// memory.
VirtualFrame::VirtualFrame()
: elements_(parameter_count() + local_count() + kPreallocatedElements),
stack_pointer_(parameter_count()) { // 0-based index of TOS.
for (int i = 0; i <= stack_pointer_; i++) {
elements_.Add(FrameElement::MemoryElement(NumberInfo::kUnknown));
}
for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
register_locations_[i] = kIllegalIndex;
}
}
void VirtualFrame::SyncElementBelowStackPointer(int index) {
UNREACHABLE();
}
void VirtualFrame::SyncElementByPushing(int index) {
UNREACHABLE();
}
void VirtualFrame::SyncRange(int begin, int end) {
// All elements are in memory on ARM (ie, synced).
#ifdef DEBUG
for (int i = begin; i <= end; i++) {
ASSERT(elements_[i].is_synced());
}
#endif
}
void VirtualFrame::MergeTo(VirtualFrame* expected) {
// ARM frames are currently always in memory.
ASSERT(Equals(expected));
}
void VirtualFrame::MergeMoveRegistersToMemory(VirtualFrame* expected) {
UNREACHABLE();
}
void VirtualFrame::MergeMoveRegistersToRegisters(VirtualFrame* expected) {
UNREACHABLE();
}
void VirtualFrame::MergeMoveMemoryToRegisters(VirtualFrame* expected) {
UNREACHABLE();
}
void VirtualFrame::Enter() {
Comment cmnt(masm(), "[ Enter JS frame");
#ifdef DEBUG
// Verify that r1 contains a JS function. The following code relies
// on r2 being available for use.
if (FLAG_debug_code) {
Label map_check, done;
__ tst(r1, Operand(kSmiTagMask));
__ b(ne, &map_check);
__ stop("VirtualFrame::Enter - r1 is not a function (smi check).");
__ bind(&map_check);
__ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
__ b(eq, &done);
__ stop("VirtualFrame::Enter - r1 is not a function (map check).");
__ bind(&done);
}
#endif // DEBUG
// We are about to push four values to the frame.
Adjust(4);
__ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
// Adjust FP to point to saved FP.
__ add(fp, sp, Operand(2 * kPointerSize));
cgen()->allocator()->Unuse(r1);
cgen()->allocator()->Unuse(lr);
}
void VirtualFrame::Exit() {
Comment cmnt(masm(), "[ Exit JS frame");
// Record the location of the JS exit code for patching when setting
// break point.
__ RecordJSReturn();
// Drop the execution stack down to the frame pointer and restore the caller
// frame pointer and return address.
__ mov(sp, fp);
__ ldm(ia_w, sp, fp.bit() | lr.bit());
}
void VirtualFrame::AllocateStackSlots() {
int count = local_count();
if (count > 0) {
Comment cmnt(masm(), "[ Allocate space for locals");
Adjust(count);
// Initialize stack slots with 'undefined' value.
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ LoadRoot(r2, Heap::kStackLimitRootIndex);
if (count < kLocalVarBound) {
// For less locals the unrolled loop is more compact.
for (int i = 0; i < count; i++) {
__ push(ip);
}
} else {
// For more locals a loop in generated code is more compact.
Label alloc_locals_loop;
__ mov(r1, Operand(count));
__ bind(&alloc_locals_loop);
__ push(ip);
__ sub(r1, r1, Operand(1), SetCC);
__ b(ne, &alloc_locals_loop);
}
} else {
__ LoadRoot(r2, Heap::kStackLimitRootIndex);
}
// Check the stack for overflow or a break request.
// Put the lr setup instruction in the delay slot. The kInstrSize is added
// to the implicit 8 byte offset that always applies to operations with pc
// and gives a return address 12 bytes down.
masm()->add(lr, pc, Operand(Assembler::kInstrSize));
masm()->cmp(sp, Operand(r2));
StackCheckStub stub;
// Call the stub if lower.
masm()->mov(pc,
Operand(reinterpret_cast<intptr_t>(stub.GetCode().location()),
RelocInfo::CODE_TARGET),
LeaveCC,
lo);
}
void VirtualFrame::SaveContextRegister() {
UNIMPLEMENTED();
}
void VirtualFrame::RestoreContextRegister() {
UNIMPLEMENTED();
}
void VirtualFrame::PushReceiverSlotAddress() {
UNIMPLEMENTED();
}
int VirtualFrame::InvalidateFrameSlotAt(int index) {
UNIMPLEMENTED();
return kIllegalIndex;
}
void VirtualFrame::TakeFrameSlotAt(int index) {
UNIMPLEMENTED();
}
void VirtualFrame::StoreToFrameSlotAt(int index) {
UNIMPLEMENTED();
}
void VirtualFrame::PushTryHandler(HandlerType type) {
// Grow the expression stack by handler size less one (the return
// address in lr is already counted by a call instruction).
Adjust(kHandlerSize - 1);
__ PushTryHandler(IN_JAVASCRIPT, type);
}
void VirtualFrame::CallRuntime(Runtime::Function* f, int arg_count) {
Forget(arg_count);
ASSERT(cgen()->HasValidEntryRegisters());
__ CallRuntime(f, arg_count);
}
void VirtualFrame::CallRuntime(Runtime::FunctionId id, int arg_count) {
Forget(arg_count);
ASSERT(cgen()->HasValidEntryRegisters());
__ CallRuntime(id, arg_count);
}
#ifdef ENABLE_DEBUGGER_SUPPORT
void VirtualFrame::DebugBreak() {
ASSERT(cgen()->HasValidEntryRegisters());
__ DebugBreak();
}
#endif
void VirtualFrame::InvokeBuiltin(Builtins::JavaScript id,
InvokeJSFlags flags,
int arg_count) {
Forget(arg_count);
__ InvokeBuiltin(id, flags);
}
void VirtualFrame::CallCodeObject(Handle<Code> code,
RelocInfo::Mode rmode,
int dropped_args) {
switch (code->kind()) {
case Code::CALL_IC:
case Code::FUNCTION:
break;
case Code::KEYED_LOAD_IC:
case Code::LOAD_IC:
case Code::KEYED_STORE_IC:
case Code::STORE_IC:
ASSERT(dropped_args == 0);
break;
case Code::BUILTIN:
ASSERT(*code == Builtins::builtin(Builtins::JSConstructCall));
break;
default:
UNREACHABLE();
break;
}
Forget(dropped_args);
ASSERT(cgen()->HasValidEntryRegisters());
__ Call(code, rmode);
}
void VirtualFrame::Drop(int count) {
ASSERT(count >= 0);
ASSERT(height() >= count);
int num_virtual_elements = (element_count() - 1) - stack_pointer_;
// Emit code to lower the stack pointer if necessary.
if (num_virtual_elements < count) {
int num_dropped = count - num_virtual_elements;
stack_pointer_ -= num_dropped;
__ add(sp, sp, Operand(num_dropped * kPointerSize));
}
// Discard elements from the virtual frame and free any registers.
for (int i = 0; i < count; i++) {
FrameElement dropped = elements_.RemoveLast();
if (dropped.is_register()) {
Unuse(dropped.reg());
}
}
}
Result VirtualFrame::Pop() {
UNIMPLEMENTED();
return Result();
}
void VirtualFrame::EmitPop(Register reg) {
ASSERT(stack_pointer_ == element_count() - 1);
stack_pointer_--;
elements_.RemoveLast();
__ pop(reg);
}
void VirtualFrame::EmitPush(Register reg) {
ASSERT(stack_pointer_ == element_count() - 1);
elements_.Add(FrameElement::MemoryElement(NumberInfo::kUnknown));
stack_pointer_++;
__ push(reg);
}
void VirtualFrame::EmitPushMultiple(int count, int src_regs) {
ASSERT(stack_pointer_ == element_count() - 1);
Adjust(count);
__ stm(db_w, sp, src_regs);
}
#undef __
} } // namespace v8::internal