Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
new file mode 100644
index 0000000..cf46773
--- /dev/null
+++ b/src/arm/macro-assembler-arm.cc
@@ -0,0 +1,1189 @@
+// Copyright 2006-2009 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 "bootstrapper.h"
+#include "codegen-inl.h"
+#include "debug.h"
+#include "runtime.h"
+
+namespace v8 {
+namespace internal {
+
+MacroAssembler::MacroAssembler(void* buffer, int size)
+ : Assembler(buffer, size),
+ unresolved_(0),
+ generating_stub_(false),
+ allow_stub_calls_(true),
+ code_object_(Heap::undefined_value()) {
+}
+
+
+// We always generate arm code, never thumb code, even if V8 is compiled to
+// thumb, so we require inter-working support
+#if defined(__thumb__) && !defined(USE_THUMB_INTERWORK)
+#error "flag -mthumb-interwork missing"
+#endif
+
+
+// We do not support thumb inter-working with an arm architecture not supporting
+// the blx instruction (below v5t). If you know what CPU you are compiling for
+// you can use -march=armv7 or similar.
+#if defined(USE_THUMB_INTERWORK) && !defined(CAN_USE_THUMB_INSTRUCTIONS)
+# error "For thumb inter-working we require an architecture which supports blx"
+#endif
+
+
+// Using blx may yield better code, so use it when required or when available
+#if defined(USE_THUMB_INTERWORK) || defined(CAN_USE_ARMV5_INSTRUCTIONS)
+#define USE_BLX 1
+#endif
+
+// Using bx does not yield better code, so use it only when required
+#if defined(USE_THUMB_INTERWORK)
+#define USE_BX 1
+#endif
+
+
+void MacroAssembler::Jump(Register target, Condition cond) {
+#if USE_BX
+ bx(target, cond);
+#else
+ mov(pc, Operand(target), LeaveCC, cond);
+#endif
+}
+
+
+void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode,
+ Condition cond) {
+#if USE_BX
+ mov(ip, Operand(target, rmode), LeaveCC, cond);
+ bx(ip, cond);
+#else
+ mov(pc, Operand(target, rmode), LeaveCC, cond);
+#endif
+}
+
+
+void MacroAssembler::Jump(byte* target, RelocInfo::Mode rmode,
+ Condition cond) {
+ ASSERT(!RelocInfo::IsCodeTarget(rmode));
+ Jump(reinterpret_cast<intptr_t>(target), rmode, cond);
+}
+
+
+void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode,
+ Condition cond) {
+ ASSERT(RelocInfo::IsCodeTarget(rmode));
+ // 'code' is always generated ARM code, never THUMB code
+ Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
+}
+
+
+void MacroAssembler::Call(Register target, Condition cond) {
+#if USE_BLX
+ blx(target, cond);
+#else
+ // set lr for return at current pc + 8
+ mov(lr, Operand(pc), LeaveCC, cond);
+ mov(pc, Operand(target), LeaveCC, cond);
+#endif
+}
+
+
+void MacroAssembler::Call(intptr_t target, RelocInfo::Mode rmode,
+ Condition cond) {
+ // Set lr for return at current pc + 8.
+ mov(lr, Operand(pc), LeaveCC, cond);
+ // Emit a ldr<cond> pc, [pc + offset of target in constant pool].
+ mov(pc, Operand(target, rmode), LeaveCC, cond);
+ // If USE_BLX is defined, we could emit a 'mov ip, target', followed by a
+ // 'blx ip'; however, the code would not be shorter than the above sequence
+ // and the target address of the call would be referenced by the first
+ // instruction rather than the second one, which would make it harder to patch
+ // (two instructions before the return address, instead of one).
+ ASSERT(kCallTargetAddressOffset == kInstrSize);
+}
+
+
+void MacroAssembler::Call(byte* target, RelocInfo::Mode rmode,
+ Condition cond) {
+ ASSERT(!RelocInfo::IsCodeTarget(rmode));
+ Call(reinterpret_cast<intptr_t>(target), rmode, cond);
+}
+
+
+void MacroAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode,
+ Condition cond) {
+ ASSERT(RelocInfo::IsCodeTarget(rmode));
+ // 'code' is always generated ARM code, never THUMB code
+ Call(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
+}
+
+
+void MacroAssembler::Ret(Condition cond) {
+#if USE_BX
+ bx(lr, cond);
+#else
+ mov(pc, Operand(lr), LeaveCC, cond);
+#endif
+}
+
+
+void MacroAssembler::SmiJumpTable(Register index, Vector<Label*> targets) {
+ // Empty the const pool.
+ CheckConstPool(true, true);
+ add(pc, pc, Operand(index,
+ LSL,
+ assembler::arm::Instr::kInstrSizeLog2 - kSmiTagSize));
+ BlockConstPoolBefore(pc_offset() + (targets.length() + 1) * kInstrSize);
+ nop(); // Jump table alignment.
+ for (int i = 0; i < targets.length(); i++) {
+ b(targets[i]);
+ }
+}
+
+
+void MacroAssembler::LoadRoot(Register destination,
+ Heap::RootListIndex index,
+ Condition cond) {
+ ldr(destination, MemOperand(r10, index << kPointerSizeLog2), cond);
+}
+
+
+// Will clobber 4 registers: object, offset, scratch, ip. The
+// register 'object' contains a heap object pointer. The heap object
+// tag is shifted away.
+void MacroAssembler::RecordWrite(Register object, Register offset,
+ Register scratch) {
+ // This is how much we shift the remembered set bit offset to get the
+ // offset of the word in the remembered set. We divide by kBitsPerInt (32,
+ // shift right 5) and then multiply by kIntSize (4, shift left 2).
+ const int kRSetWordShift = 3;
+
+ Label fast, done;
+
+ // First, test that the object is not in the new space. We cannot set
+ // remembered set bits in the new space.
+ // object: heap object pointer (with tag)
+ // offset: offset to store location from the object
+ and_(scratch, object, Operand(Heap::NewSpaceMask()));
+ cmp(scratch, Operand(ExternalReference::new_space_start()));
+ b(eq, &done);
+
+ // Compute the bit offset in the remembered set.
+ // object: heap object pointer (with tag)
+ // offset: offset to store location from the object
+ mov(ip, Operand(Page::kPageAlignmentMask)); // load mask only once
+ and_(scratch, object, Operand(ip)); // offset into page of the object
+ add(offset, scratch, Operand(offset)); // add offset into the object
+ mov(offset, Operand(offset, LSR, kObjectAlignmentBits));
+
+ // Compute the page address from the heap object pointer.
+ // object: heap object pointer (with tag)
+ // offset: bit offset of store position in the remembered set
+ bic(object, object, Operand(ip));
+
+ // If the bit offset lies beyond the normal remembered set range, it is in
+ // the extra remembered set area of a large object.
+ // object: page start
+ // offset: bit offset of store position in the remembered set
+ cmp(offset, Operand(Page::kPageSize / kPointerSize));
+ b(lt, &fast);
+
+ // Adjust the bit offset to be relative to the start of the extra
+ // remembered set and the start address to be the address of the extra
+ // remembered set.
+ sub(offset, offset, Operand(Page::kPageSize / kPointerSize));
+ // Load the array length into 'scratch' and multiply by four to get the
+ // size in bytes of the elements.
+ ldr(scratch, MemOperand(object, Page::kObjectStartOffset
+ + FixedArray::kLengthOffset));
+ mov(scratch, Operand(scratch, LSL, kObjectAlignmentBits));
+ // Add the page header (including remembered set), array header, and array
+ // body size to the page address.
+ add(object, object, Operand(Page::kObjectStartOffset
+ + FixedArray::kHeaderSize));
+ add(object, object, Operand(scratch));
+
+ bind(&fast);
+ // Get address of the rset word.
+ // object: start of the remembered set (page start for the fast case)
+ // offset: bit offset of store position in the remembered set
+ bic(scratch, offset, Operand(kBitsPerInt - 1)); // clear the bit offset
+ add(object, object, Operand(scratch, LSR, kRSetWordShift));
+ // Get bit offset in the rset word.
+ // object: address of remembered set word
+ // offset: bit offset of store position
+ and_(offset, offset, Operand(kBitsPerInt - 1));
+
+ ldr(scratch, MemOperand(object));
+ mov(ip, Operand(1));
+ orr(scratch, scratch, Operand(ip, LSL, offset));
+ str(scratch, MemOperand(object));
+
+ bind(&done);
+}
+
+
+void MacroAssembler::EnterFrame(StackFrame::Type type) {
+ // r0-r3: preserved
+ stm(db_w, sp, cp.bit() | fp.bit() | lr.bit());
+ mov(ip, Operand(Smi::FromInt(type)));
+ push(ip);
+ mov(ip, Operand(CodeObject()));
+ push(ip);
+ add(fp, sp, Operand(3 * kPointerSize)); // Adjust FP to point to saved FP.
+}
+
+
+void MacroAssembler::LeaveFrame(StackFrame::Type type) {
+ // r0: preserved
+ // r1: preserved
+ // r2: preserved
+
+ // 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 MacroAssembler::EnterExitFrame(StackFrame::Type type) {
+ ASSERT(type == StackFrame::EXIT || type == StackFrame::EXIT_DEBUG);
+
+ // Compute the argv pointer and keep it in a callee-saved register.
+ // r0 is argc.
+ add(r6, sp, Operand(r0, LSL, kPointerSizeLog2));
+ sub(r6, r6, Operand(kPointerSize));
+
+ // Compute callee's stack pointer before making changes and save it as
+ // ip register so that it is restored as sp register on exit, thereby
+ // popping the args.
+
+ // ip = sp + kPointerSize * #args;
+ add(ip, sp, Operand(r0, LSL, kPointerSizeLog2));
+
+ // Align the stack at this point. After this point we have 5 pushes,
+ // so in fact we have to unalign here! See also the assert on the
+ // alignment in AlignStack.
+ AlignStack(1);
+
+ // Push in reverse order: caller_fp, sp_on_exit, and caller_pc.
+ stm(db_w, sp, fp.bit() | ip.bit() | lr.bit());
+ mov(fp, Operand(sp)); // setup new frame pointer
+
+ // Push debug marker.
+ mov(ip, Operand(type == StackFrame::EXIT_DEBUG ? 1 : 0));
+ push(ip);
+
+ // Save the frame pointer and the context in top.
+ mov(ip, Operand(ExternalReference(Top::k_c_entry_fp_address)));
+ str(fp, MemOperand(ip));
+ mov(ip, Operand(ExternalReference(Top::k_context_address)));
+ str(cp, MemOperand(ip));
+
+ // Setup argc and the builtin function in callee-saved registers.
+ mov(r4, Operand(r0));
+ mov(r5, Operand(r1));
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ // Save the state of all registers to the stack from the memory
+ // location. This is needed to allow nested break points.
+ if (type == StackFrame::EXIT_DEBUG) {
+ // Use sp as base to push.
+ CopyRegistersFromMemoryToStack(sp, kJSCallerSaved);
+ }
+#endif
+}
+
+
+void MacroAssembler::AlignStack(int offset) {
+#if defined(V8_HOST_ARCH_ARM)
+ // Running on the real platform. Use the alignment as mandated by the local
+ // environment.
+ // Note: This will break if we ever start generating snapshots on one ARM
+ // platform for another ARM platform with a different alignment.
+ int activation_frame_alignment = OS::ActivationFrameAlignment();
+#else // defined(V8_HOST_ARCH_ARM)
+ // If we are using the simulator then we should always align to the expected
+ // alignment. As the simulator is used to generate snapshots we do not know
+ // if the target platform will need alignment, so we will always align at
+ // this point here.
+ int activation_frame_alignment = 2 * kPointerSize;
+#endif // defined(V8_HOST_ARCH_ARM)
+ if (activation_frame_alignment != kPointerSize) {
+ // This code needs to be made more general if this assert doesn't hold.
+ ASSERT(activation_frame_alignment == 2 * kPointerSize);
+ mov(r7, Operand(Smi::FromInt(0)));
+ tst(sp, Operand(activation_frame_alignment - offset));
+ push(r7, eq); // Conditional push instruction.
+ }
+}
+
+
+void MacroAssembler::LeaveExitFrame(StackFrame::Type type) {
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ // Restore the memory copy of the registers by digging them out from
+ // the stack. This is needed to allow nested break points.
+ if (type == StackFrame::EXIT_DEBUG) {
+ // This code intentionally clobbers r2 and r3.
+ const int kCallerSavedSize = kNumJSCallerSaved * kPointerSize;
+ const int kOffset = ExitFrameConstants::kDebugMarkOffset - kCallerSavedSize;
+ add(r3, fp, Operand(kOffset));
+ CopyRegistersFromStackToMemory(r3, r2, kJSCallerSaved);
+ }
+#endif
+
+ // Clear top frame.
+ mov(r3, Operand(0));
+ mov(ip, Operand(ExternalReference(Top::k_c_entry_fp_address)));
+ str(r3, MemOperand(ip));
+
+ // Restore current context from top and clear it in debug mode.
+ mov(ip, Operand(ExternalReference(Top::k_context_address)));
+ ldr(cp, MemOperand(ip));
+#ifdef DEBUG
+ str(r3, MemOperand(ip));
+#endif
+
+ // Pop the arguments, restore registers, and return.
+ mov(sp, Operand(fp)); // respect ABI stack constraint
+ ldm(ia, sp, fp.bit() | sp.bit() | pc.bit());
+}
+
+
+void MacroAssembler::InvokePrologue(const ParameterCount& expected,
+ const ParameterCount& actual,
+ Handle<Code> code_constant,
+ Register code_reg,
+ Label* done,
+ InvokeFlag flag) {
+ bool definitely_matches = false;
+ Label regular_invoke;
+
+ // Check whether the expected and actual arguments count match. If not,
+ // setup registers according to contract with ArgumentsAdaptorTrampoline:
+ // r0: actual arguments count
+ // r1: function (passed through to callee)
+ // r2: expected arguments count
+ // r3: callee code entry
+
+ // The code below is made a lot easier because the calling code already sets
+ // up actual and expected registers according to the contract if values are
+ // passed in registers.
+ ASSERT(actual.is_immediate() || actual.reg().is(r0));
+ ASSERT(expected.is_immediate() || expected.reg().is(r2));
+ ASSERT((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(r3));
+
+ if (expected.is_immediate()) {
+ ASSERT(actual.is_immediate());
+ if (expected.immediate() == actual.immediate()) {
+ definitely_matches = true;
+ } else {
+ mov(r0, Operand(actual.immediate()));
+ const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
+ if (expected.immediate() == sentinel) {
+ // Don't worry about adapting arguments for builtins that
+ // don't want that done. Skip adaption code by making it look
+ // like we have a match between expected and actual number of
+ // arguments.
+ definitely_matches = true;
+ } else {
+ mov(r2, Operand(expected.immediate()));
+ }
+ }
+ } else {
+ if (actual.is_immediate()) {
+ cmp(expected.reg(), Operand(actual.immediate()));
+ b(eq, ®ular_invoke);
+ mov(r0, Operand(actual.immediate()));
+ } else {
+ cmp(expected.reg(), Operand(actual.reg()));
+ b(eq, ®ular_invoke);
+ }
+ }
+
+ if (!definitely_matches) {
+ if (!code_constant.is_null()) {
+ mov(r3, Operand(code_constant));
+ add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
+ }
+
+ Handle<Code> adaptor =
+ Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline));
+ if (flag == CALL_FUNCTION) {
+ Call(adaptor, RelocInfo::CODE_TARGET);
+ b(done);
+ } else {
+ Jump(adaptor, RelocInfo::CODE_TARGET);
+ }
+ bind(®ular_invoke);
+ }
+}
+
+
+void MacroAssembler::InvokeCode(Register code,
+ const ParameterCount& expected,
+ const ParameterCount& actual,
+ InvokeFlag flag) {
+ Label done;
+
+ InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag);
+ if (flag == CALL_FUNCTION) {
+ Call(code);
+ } else {
+ ASSERT(flag == JUMP_FUNCTION);
+ Jump(code);
+ }
+
+ // Continue here if InvokePrologue does handle the invocation due to
+ // mismatched parameter counts.
+ bind(&done);
+}
+
+
+void MacroAssembler::InvokeCode(Handle<Code> code,
+ const ParameterCount& expected,
+ const ParameterCount& actual,
+ RelocInfo::Mode rmode,
+ InvokeFlag flag) {
+ Label done;
+
+ InvokePrologue(expected, actual, code, no_reg, &done, flag);
+ if (flag == CALL_FUNCTION) {
+ Call(code, rmode);
+ } else {
+ Jump(code, rmode);
+ }
+
+ // Continue here if InvokePrologue does handle the invocation due to
+ // mismatched parameter counts.
+ bind(&done);
+}
+
+
+void MacroAssembler::InvokeFunction(Register fun,
+ const ParameterCount& actual,
+ InvokeFlag flag) {
+ // Contract with called JS functions requires that function is passed in r1.
+ ASSERT(fun.is(r1));
+
+ Register expected_reg = r2;
+ Register code_reg = r3;
+
+ ldr(code_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
+ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
+ ldr(expected_reg,
+ FieldMemOperand(code_reg,
+ SharedFunctionInfo::kFormalParameterCountOffset));
+ ldr(code_reg,
+ MemOperand(code_reg, SharedFunctionInfo::kCodeOffset - kHeapObjectTag));
+ add(code_reg, code_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+ ParameterCount expected(expected_reg);
+ InvokeCode(code_reg, expected, actual, flag);
+}
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+void MacroAssembler::SaveRegistersToMemory(RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Copy the content of registers to memory location.
+ for (int i = 0; i < kNumJSCallerSaved; i++) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ Register reg = { r };
+ mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+ str(reg, MemOperand(ip));
+ }
+ }
+}
+
+
+void MacroAssembler::RestoreRegistersFromMemory(RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Copy the content of memory location to registers.
+ for (int i = kNumJSCallerSaved; --i >= 0;) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ Register reg = { r };
+ mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+ ldr(reg, MemOperand(ip));
+ }
+ }
+}
+
+
+void MacroAssembler::CopyRegistersFromMemoryToStack(Register base,
+ RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Copy the content of the memory location to the stack and adjust base.
+ for (int i = kNumJSCallerSaved; --i >= 0;) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+ ldr(ip, MemOperand(ip));
+ str(ip, MemOperand(base, 4, NegPreIndex));
+ }
+ }
+}
+
+
+void MacroAssembler::CopyRegistersFromStackToMemory(Register base,
+ Register scratch,
+ RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Copy the content of the stack to the memory location and adjust base.
+ for (int i = 0; i < kNumJSCallerSaved; i++) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+ ldr(scratch, MemOperand(base, 4, PostIndex));
+ str(scratch, MemOperand(ip));
+ }
+ }
+}
+#endif
+
+
+void MacroAssembler::PushTryHandler(CodeLocation try_location,
+ HandlerType type) {
+ // Adjust this code if not the case.
+ ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
+ // The pc (return address) is passed in register lr.
+ if (try_location == IN_JAVASCRIPT) {
+ if (type == TRY_CATCH_HANDLER) {
+ mov(r3, Operand(StackHandler::TRY_CATCH));
+ } else {
+ mov(r3, Operand(StackHandler::TRY_FINALLY));
+ }
+ ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize
+ && StackHandlerConstants::kFPOffset == 2 * kPointerSize
+ && StackHandlerConstants::kPCOffset == 3 * kPointerSize);
+ stm(db_w, sp, r3.bit() | fp.bit() | lr.bit());
+ // Save the current handler as the next handler.
+ mov(r3, Operand(ExternalReference(Top::k_handler_address)));
+ ldr(r1, MemOperand(r3));
+ ASSERT(StackHandlerConstants::kNextOffset == 0);
+ push(r1);
+ // Link this handler as the new current one.
+ str(sp, MemOperand(r3));
+ } else {
+ // Must preserve r0-r4, r5-r7 are available.
+ ASSERT(try_location == IN_JS_ENTRY);
+ // The frame pointer does not point to a JS frame so we save NULL
+ // for fp. We expect the code throwing an exception to check fp
+ // before dereferencing it to restore the context.
+ mov(ip, Operand(0)); // To save a NULL frame pointer.
+ mov(r6, Operand(StackHandler::ENTRY));
+ ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize
+ && StackHandlerConstants::kFPOffset == 2 * kPointerSize
+ && StackHandlerConstants::kPCOffset == 3 * kPointerSize);
+ stm(db_w, sp, r6.bit() | ip.bit() | lr.bit());
+ // Save the current handler as the next handler.
+ mov(r7, Operand(ExternalReference(Top::k_handler_address)));
+ ldr(r6, MemOperand(r7));
+ ASSERT(StackHandlerConstants::kNextOffset == 0);
+ push(r6);
+ // Link this handler as the new current one.
+ str(sp, MemOperand(r7));
+ }
+}
+
+
+Register MacroAssembler::CheckMaps(JSObject* object, Register object_reg,
+ JSObject* holder, Register holder_reg,
+ Register scratch,
+ Label* miss) {
+ // Make sure there's no overlap between scratch and the other
+ // registers.
+ ASSERT(!scratch.is(object_reg) && !scratch.is(holder_reg));
+
+ // Keep track of the current object in register reg.
+ Register reg = object_reg;
+ int depth = 1;
+
+ // Check the maps in the prototype chain.
+ // Traverse the prototype chain from the object and do map checks.
+ while (object != holder) {
+ depth++;
+
+ // Only global objects and objects that do not require access
+ // checks are allowed in stubs.
+ ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded());
+
+ // Get the map of the current object.
+ ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+ cmp(scratch, Operand(Handle<Map>(object->map())));
+
+ // Branch on the result of the map check.
+ b(ne, miss);
+
+ // Check access rights to the global object. This has to happen
+ // after the map check so that we know that the object is
+ // actually a global object.
+ if (object->IsJSGlobalProxy()) {
+ CheckAccessGlobalProxy(reg, scratch, miss);
+ // Restore scratch register to be the map of the object. In the
+ // new space case below, we load the prototype from the map in
+ // the scratch register.
+ ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+ }
+
+ reg = holder_reg; // from now the object is in holder_reg
+ JSObject* prototype = JSObject::cast(object->GetPrototype());
+ if (Heap::InNewSpace(prototype)) {
+ // The prototype is in new space; we cannot store a reference
+ // to it in the code. Load it from the map.
+ ldr(reg, FieldMemOperand(scratch, Map::kPrototypeOffset));
+ } else {
+ // The prototype is in old space; load it directly.
+ mov(reg, Operand(Handle<JSObject>(prototype)));
+ }
+
+ // Go to the next object in the prototype chain.
+ object = prototype;
+ }
+
+ // Check the holder map.
+ ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+ cmp(scratch, Operand(Handle<Map>(object->map())));
+ b(ne, miss);
+
+ // Log the check depth.
+ LOG(IntEvent("check-maps-depth", depth));
+
+ // Perform security check for access to the global object and return
+ // the holder register.
+ ASSERT(object == holder);
+ ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded());
+ if (object->IsJSGlobalProxy()) {
+ CheckAccessGlobalProxy(reg, scratch, miss);
+ }
+ return reg;
+}
+
+
+void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
+ Register scratch,
+ Label* miss) {
+ Label same_contexts;
+
+ ASSERT(!holder_reg.is(scratch));
+ ASSERT(!holder_reg.is(ip));
+ ASSERT(!scratch.is(ip));
+
+ // Load current lexical context from the stack frame.
+ ldr(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset));
+ // In debug mode, make sure the lexical context is set.
+#ifdef DEBUG
+ cmp(scratch, Operand(0));
+ Check(ne, "we should not have an empty lexical context");
+#endif
+
+ // Load the global context of the current context.
+ int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
+ ldr(scratch, FieldMemOperand(scratch, offset));
+ ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
+
+ // Check the context is a global context.
+ if (FLAG_debug_code) {
+ // TODO(119): avoid push(holder_reg)/pop(holder_reg)
+ // Cannot use ip as a temporary in this verification code. Due to the fact
+ // that ip is clobbered as part of cmp with an object Operand.
+ push(holder_reg); // Temporarily save holder on the stack.
+ // Read the first word and compare to the global_context_map.
+ ldr(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
+ LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+ cmp(holder_reg, ip);
+ Check(eq, "JSGlobalObject::global_context should be a global context.");
+ pop(holder_reg); // Restore holder.
+ }
+
+ // Check if both contexts are the same.
+ ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+ cmp(scratch, Operand(ip));
+ b(eq, &same_contexts);
+
+ // Check the context is a global context.
+ if (FLAG_debug_code) {
+ // TODO(119): avoid push(holder_reg)/pop(holder_reg)
+ // Cannot use ip as a temporary in this verification code. Due to the fact
+ // that ip is clobbered as part of cmp with an object Operand.
+ push(holder_reg); // Temporarily save holder on the stack.
+ mov(holder_reg, ip); // Move ip to its holding place.
+ LoadRoot(ip, Heap::kNullValueRootIndex);
+ cmp(holder_reg, ip);
+ Check(ne, "JSGlobalProxy::context() should not be null.");
+
+ ldr(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
+ LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+ cmp(holder_reg, ip);
+ Check(eq, "JSGlobalObject::global_context should be a global context.");
+ // Restore ip is not needed. ip is reloaded below.
+ pop(holder_reg); // Restore holder.
+ // Restore ip to holder's context.
+ ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+ }
+
+ // Check that the security token in the calling global object is
+ // compatible with the security token in the receiving global
+ // object.
+ int token_offset = Context::kHeaderSize +
+ Context::SECURITY_TOKEN_INDEX * kPointerSize;
+
+ ldr(scratch, FieldMemOperand(scratch, token_offset));
+ ldr(ip, FieldMemOperand(ip, token_offset));
+ cmp(scratch, Operand(ip));
+ b(ne, miss);
+
+ bind(&same_contexts);
+}
+
+
+void MacroAssembler::AllocateInNewSpace(int object_size,
+ Register result,
+ Register scratch1,
+ Register scratch2,
+ Label* gc_required,
+ AllocationFlags flags) {
+ ASSERT(!result.is(scratch1));
+ ASSERT(!scratch1.is(scratch2));
+
+ // Load address of new object into result and allocation top address into
+ // scratch1.
+ ExternalReference new_space_allocation_top =
+ ExternalReference::new_space_allocation_top_address();
+ mov(scratch1, Operand(new_space_allocation_top));
+ if ((flags & RESULT_CONTAINS_TOP) == 0) {
+ ldr(result, MemOperand(scratch1));
+ } else {
+#ifdef DEBUG
+ // Assert that result actually contains top on entry. scratch2 is used
+ // immediately below so this use of scratch2 does not cause difference with
+ // respect to register content between debug and release mode.
+ ldr(scratch2, MemOperand(scratch1));
+ cmp(result, scratch2);
+ Check(eq, "Unexpected allocation top");
+#endif
+ }
+
+ // Calculate new top and bail out if new space is exhausted. Use result
+ // to calculate the new top.
+ ExternalReference new_space_allocation_limit =
+ ExternalReference::new_space_allocation_limit_address();
+ mov(scratch2, Operand(new_space_allocation_limit));
+ ldr(scratch2, MemOperand(scratch2));
+ add(result, result, Operand(object_size * kPointerSize));
+ cmp(result, Operand(scratch2));
+ b(hi, gc_required);
+
+ // Update allocation top. result temporarily holds the new top,
+ str(result, MemOperand(scratch1));
+
+ // Tag and adjust back to start of new object.
+ if ((flags & TAG_OBJECT) != 0) {
+ sub(result, result, Operand((object_size * kPointerSize) -
+ kHeapObjectTag));
+ } else {
+ sub(result, result, Operand(object_size * kPointerSize));
+ }
+}
+
+
+void MacroAssembler::AllocateInNewSpace(Register object_size,
+ Register result,
+ Register scratch1,
+ Register scratch2,
+ Label* gc_required,
+ AllocationFlags flags) {
+ ASSERT(!result.is(scratch1));
+ ASSERT(!scratch1.is(scratch2));
+
+ // Load address of new object into result and allocation top address into
+ // scratch1.
+ ExternalReference new_space_allocation_top =
+ ExternalReference::new_space_allocation_top_address();
+ mov(scratch1, Operand(new_space_allocation_top));
+ if ((flags & RESULT_CONTAINS_TOP) == 0) {
+ ldr(result, MemOperand(scratch1));
+ } else {
+#ifdef DEBUG
+ // Assert that result actually contains top on entry. scratch2 is used
+ // immediately below so this use of scratch2 does not cause difference with
+ // respect to register content between debug and release mode.
+ ldr(scratch2, MemOperand(scratch1));
+ cmp(result, scratch2);
+ Check(eq, "Unexpected allocation top");
+#endif
+ }
+
+ // Calculate new top and bail out if new space is exhausted. Use result
+ // to calculate the new top. Object size is in words so a shift is required to
+ // get the number of bytes
+ ExternalReference new_space_allocation_limit =
+ ExternalReference::new_space_allocation_limit_address();
+ mov(scratch2, Operand(new_space_allocation_limit));
+ ldr(scratch2, MemOperand(scratch2));
+ add(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+ cmp(result, Operand(scratch2));
+ b(hi, gc_required);
+
+ // Update allocation top. result temporarily holds the new top,
+ str(result, MemOperand(scratch1));
+
+ // Adjust back to start of new object.
+ sub(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+
+ // Tag object if requested.
+ if ((flags & TAG_OBJECT) != 0) {
+ add(result, result, Operand(kHeapObjectTag));
+ }
+}
+
+
+void MacroAssembler::UndoAllocationInNewSpace(Register object,
+ Register scratch) {
+ ExternalReference new_space_allocation_top =
+ ExternalReference::new_space_allocation_top_address();
+
+ // Make sure the object has no tag before resetting top.
+ and_(object, object, Operand(~kHeapObjectTagMask));
+#ifdef DEBUG
+ // Check that the object un-allocated is below the current top.
+ mov(scratch, Operand(new_space_allocation_top));
+ ldr(scratch, MemOperand(scratch));
+ cmp(object, scratch);
+ Check(lt, "Undo allocation of non allocated memory");
+#endif
+ // Write the address of the object to un-allocate as the current top.
+ mov(scratch, Operand(new_space_allocation_top));
+ str(object, MemOperand(scratch));
+}
+
+
+void MacroAssembler::CompareObjectType(Register function,
+ Register map,
+ Register type_reg,
+ InstanceType type) {
+ ldr(map, FieldMemOperand(function, HeapObject::kMapOffset));
+ CompareInstanceType(map, type_reg, type);
+}
+
+
+void MacroAssembler::CompareInstanceType(Register map,
+ Register type_reg,
+ InstanceType type) {
+ ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
+ cmp(type_reg, Operand(type));
+}
+
+
+void MacroAssembler::TryGetFunctionPrototype(Register function,
+ Register result,
+ Register scratch,
+ Label* miss) {
+ // Check that the receiver isn't a smi.
+ BranchOnSmi(function, miss);
+
+ // Check that the function really is a function. Load map into result reg.
+ CompareObjectType(function, result, scratch, JS_FUNCTION_TYPE);
+ b(ne, miss);
+
+ // Make sure that the function has an instance prototype.
+ Label non_instance;
+ ldrb(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
+ tst(scratch, Operand(1 << Map::kHasNonInstancePrototype));
+ b(ne, &non_instance);
+
+ // Get the prototype or initial map from the function.
+ ldr(result,
+ FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+
+ // If the prototype or initial map is the hole, don't return it and
+ // simply miss the cache instead. This will allow us to allocate a
+ // prototype object on-demand in the runtime system.
+ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+ cmp(result, ip);
+ b(eq, miss);
+
+ // If the function does not have an initial map, we're done.
+ Label done;
+ CompareObjectType(result, scratch, scratch, MAP_TYPE);
+ b(ne, &done);
+
+ // Get the prototype from the initial map.
+ ldr(result, FieldMemOperand(result, Map::kPrototypeOffset));
+ jmp(&done);
+
+ // Non-instance prototype: Fetch prototype from constructor field
+ // in initial map.
+ bind(&non_instance);
+ ldr(result, FieldMemOperand(result, Map::kConstructorOffset));
+
+ // All done.
+ bind(&done);
+}
+
+
+void MacroAssembler::CallStub(CodeStub* stub, Condition cond) {
+ ASSERT(allow_stub_calls()); // stub calls are not allowed in some stubs
+ Call(stub->GetCode(), RelocInfo::CODE_TARGET, cond);
+}
+
+
+void MacroAssembler::StubReturn(int argc) {
+ ASSERT(argc >= 1 && generating_stub());
+ if (argc > 1)
+ add(sp, sp, Operand((argc - 1) * kPointerSize));
+ Ret();
+}
+
+
+void MacroAssembler::IllegalOperation(int num_arguments) {
+ if (num_arguments > 0) {
+ add(sp, sp, Operand(num_arguments * kPointerSize));
+ }
+ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
+}
+
+
+void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
+ // All parameters are on the stack. r0 has the return value after call.
+
+ // If the expected number of arguments of the runtime function is
+ // constant, we check that the actual number of arguments match the
+ // expectation.
+ if (f->nargs >= 0 && f->nargs != num_arguments) {
+ IllegalOperation(num_arguments);
+ return;
+ }
+
+ Runtime::FunctionId function_id =
+ static_cast<Runtime::FunctionId>(f->stub_id);
+ RuntimeStub stub(function_id, num_arguments);
+ CallStub(&stub);
+}
+
+
+void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
+ CallRuntime(Runtime::FunctionForId(fid), num_arguments);
+}
+
+
+void MacroAssembler::TailCallRuntime(const ExternalReference& ext,
+ int num_arguments,
+ int result_size) {
+ // TODO(1236192): Most runtime routines don't need the number of
+ // arguments passed in because it is constant. At some point we
+ // should remove this need and make the runtime routine entry code
+ // smarter.
+ mov(r0, Operand(num_arguments));
+ JumpToRuntime(ext);
+}
+
+
+void MacroAssembler::JumpToRuntime(const ExternalReference& builtin) {
+#if defined(__thumb__)
+ // Thumb mode builtin.
+ ASSERT((reinterpret_cast<intptr_t>(builtin.address()) & 1) == 1);
+#endif
+ mov(r1, Operand(builtin));
+ CEntryStub stub(1);
+ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
+Handle<Code> MacroAssembler::ResolveBuiltin(Builtins::JavaScript id,
+ bool* resolved) {
+ // Contract with compiled functions is that the function is passed in r1.
+ int builtins_offset =
+ JSBuiltinsObject::kJSBuiltinsOffset + (id * kPointerSize);
+ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+ ldr(r1, FieldMemOperand(r1, GlobalObject::kBuiltinsOffset));
+ ldr(r1, FieldMemOperand(r1, builtins_offset));
+
+ return Builtins::GetCode(id, resolved);
+}
+
+
+void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id,
+ InvokeJSFlags flags) {
+ bool resolved;
+ Handle<Code> code = ResolveBuiltin(id, &resolved);
+
+ if (flags == CALL_JS) {
+ Call(code, RelocInfo::CODE_TARGET);
+ } else {
+ ASSERT(flags == JUMP_JS);
+ Jump(code, RelocInfo::CODE_TARGET);
+ }
+
+ if (!resolved) {
+ const char* name = Builtins::GetName(id);
+ int argc = Builtins::GetArgumentsCount(id);
+ uint32_t flags =
+ Bootstrapper::FixupFlagsArgumentsCount::encode(argc) |
+ Bootstrapper::FixupFlagsIsPCRelative::encode(true) |
+ Bootstrapper::FixupFlagsUseCodeObject::encode(false);
+ Unresolved entry = { pc_offset() - kInstrSize, flags, name };
+ unresolved_.Add(entry);
+ }
+}
+
+
+void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) {
+ bool resolved;
+ Handle<Code> code = ResolveBuiltin(id, &resolved);
+
+ mov(target, Operand(code));
+ if (!resolved) {
+ const char* name = Builtins::GetName(id);
+ int argc = Builtins::GetArgumentsCount(id);
+ uint32_t flags =
+ Bootstrapper::FixupFlagsArgumentsCount::encode(argc) |
+ Bootstrapper::FixupFlagsIsPCRelative::encode(true) |
+ Bootstrapper::FixupFlagsUseCodeObject::encode(true);
+ Unresolved entry = { pc_offset() - kInstrSize, flags, name };
+ unresolved_.Add(entry);
+ }
+
+ add(target, target, Operand(Code::kHeaderSize - kHeapObjectTag));
+}
+
+
+void MacroAssembler::SetCounter(StatsCounter* counter, int value,
+ Register scratch1, Register scratch2) {
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ mov(scratch1, Operand(value));
+ mov(scratch2, Operand(ExternalReference(counter)));
+ str(scratch1, MemOperand(scratch2));
+ }
+}
+
+
+void MacroAssembler::IncrementCounter(StatsCounter* counter, int value,
+ Register scratch1, Register scratch2) {
+ ASSERT(value > 0);
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ mov(scratch2, Operand(ExternalReference(counter)));
+ ldr(scratch1, MemOperand(scratch2));
+ add(scratch1, scratch1, Operand(value));
+ str(scratch1, MemOperand(scratch2));
+ }
+}
+
+
+void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
+ Register scratch1, Register scratch2) {
+ ASSERT(value > 0);
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ mov(scratch2, Operand(ExternalReference(counter)));
+ ldr(scratch1, MemOperand(scratch2));
+ sub(scratch1, scratch1, Operand(value));
+ str(scratch1, MemOperand(scratch2));
+ }
+}
+
+
+void MacroAssembler::Assert(Condition cc, const char* msg) {
+ if (FLAG_debug_code)
+ Check(cc, msg);
+}
+
+
+void MacroAssembler::Check(Condition cc, const char* msg) {
+ Label L;
+ b(cc, &L);
+ Abort(msg);
+ // will not return here
+ bind(&L);
+}
+
+
+void MacroAssembler::Abort(const char* msg) {
+ // We want to pass the msg string like a smi to avoid GC
+ // problems, however msg is not guaranteed to be aligned
+ // properly. Instead, we pass an aligned pointer that is
+ // a proper v8 smi, but also pass the alignment difference
+ // from the real pointer as a smi.
+ intptr_t p1 = reinterpret_cast<intptr_t>(msg);
+ intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag;
+ ASSERT(reinterpret_cast<Object*>(p0)->IsSmi());
+#ifdef DEBUG
+ if (msg != NULL) {
+ RecordComment("Abort message: ");
+ RecordComment(msg);
+ }
+#endif
+ mov(r0, Operand(p0));
+ push(r0);
+ mov(r0, Operand(Smi::FromInt(p1 - p0)));
+ push(r0);
+ CallRuntime(Runtime::kAbort, 2);
+ // will not return here
+}
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+CodePatcher::CodePatcher(byte* address, int instructions)
+ : address_(address),
+ instructions_(instructions),
+ size_(instructions * Assembler::kInstrSize),
+ masm_(address, size_ + Assembler::kGap) {
+ // Create a new macro assembler pointing to the address of the code to patch.
+ // The size is adjusted with kGap on order for the assembler to generate size
+ // bytes of instructions without failing with buffer size constraints.
+ ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+CodePatcher::~CodePatcher() {
+ // Indicate that code has changed.
+ CPU::FlushICache(address_, size_);
+
+ // Check that the code was patched as expected.
+ ASSERT(masm_.pc_ == address_ + size_);
+ ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+void CodePatcher::Emit(Instr x) {
+ masm()->emit(x);
+}
+
+
+void CodePatcher::Emit(Address addr) {
+ masm()->emit(reinterpret_cast<Instr>(addr));
+}
+#endif // ENABLE_DEBUGGER_SUPPORT
+
+
+} } // namespace v8::internal