2008-09-09 20:08:45 +00:00
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// Copyright 2006-2008 the V8 project authors. All rights reserved.
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2008-07-03 15:10:15 +00:00
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#include "bootstrapper.h"
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#include "codegen-inl.h"
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#include "debug.h"
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#include "runtime.h"
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namespace v8 { namespace internal {
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DECLARE_bool(debug_code);
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DECLARE_bool(optimize_locals);
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// Give alias names to registers
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Register cp = { 8 }; // JavaScript context pointer
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Register pp = { 10 }; // parameter pointer
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MacroAssembler::MacroAssembler(void* buffer, int size)
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: Assembler(buffer, size),
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unresolved_(0),
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2008-07-30 08:49:36 +00:00
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generating_stub_(false),
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allow_stub_calls_(true) {
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2008-07-03 15:10:15 +00:00
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}
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// We always generate arm code, never thumb code, even if V8 is compiled to
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// thumb, so we require inter-working support
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#if defined(__thumb__) && !defined(__THUMB_INTERWORK__)
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#error "flag -mthumb-interwork missing"
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#endif
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// We do not support thumb inter-working with an arm architecture not supporting
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// the blx instruction (below v5t)
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#if defined(__THUMB_INTERWORK__)
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#if !defined(__ARM_ARCH_5T__) && !defined(__ARM_ARCH_5TE__)
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// add tests for other versions above v5t as required
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#error "for thumb inter-working we require architecture v5t or above"
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#endif
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#endif
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// Using blx may yield better code, so use it when required or when available
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#if defined(__THUMB_INTERWORK__) || defined(__ARM_ARCH_5__)
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#define USE_BLX 1
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#endif
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// Using bx does not yield better code, so use it only when required
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#if defined(__THUMB_INTERWORK__)
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#define USE_BX 1
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#endif
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void MacroAssembler::Jump(Register target, Condition cond) {
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#if USE_BX
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bx(target, cond);
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#else
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mov(pc, Operand(target), LeaveCC, cond);
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#endif
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}
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void MacroAssembler::Jump(intptr_t target, RelocMode rmode, Condition cond) {
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#if USE_BX
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mov(ip, Operand(target, rmode), LeaveCC, cond);
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bx(ip, cond);
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#else
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mov(pc, Operand(target, rmode), LeaveCC, cond);
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#endif
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}
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void MacroAssembler::Jump(byte* target, RelocMode rmode, Condition cond) {
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ASSERT(!is_code_target(rmode));
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Jump(reinterpret_cast<intptr_t>(target), rmode, cond);
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}
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void MacroAssembler::Jump(Handle<Code> code, RelocMode rmode, Condition cond) {
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ASSERT(is_code_target(rmode));
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// 'code' is always generated ARM code, never THUMB code
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Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
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}
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void MacroAssembler::Call(Register target, Condition cond) {
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#if USE_BLX
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blx(target, cond);
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#else
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// set lr for return at current pc + 8
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mov(lr, Operand(pc), LeaveCC, cond);
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mov(pc, Operand(target), LeaveCC, cond);
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#endif
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}
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void MacroAssembler::Call(intptr_t target, RelocMode rmode, Condition cond) {
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#if !defined(__arm__)
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if (rmode == runtime_entry) {
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mov(r2, Operand(target, rmode), LeaveCC, cond);
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// Set lr for return at current pc + 8.
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mov(lr, Operand(pc), LeaveCC, cond);
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// Emit a ldr<cond> pc, [pc + offset of target in constant pool].
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// Notify the simulator of the transition to C code.
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swi(assembler::arm::call_rt_r2);
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} else {
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// set lr for return at current pc + 8
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mov(lr, Operand(pc), LeaveCC, cond);
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// emit a ldr<cond> pc, [pc + offset of target in constant pool]
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mov(pc, Operand(target, rmode), LeaveCC, cond);
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}
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#else
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// Set lr for return at current pc + 8.
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mov(lr, Operand(pc), LeaveCC, cond);
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// Emit a ldr<cond> pc, [pc + offset of target in constant pool].
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mov(pc, Operand(target, rmode), LeaveCC, cond);
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#endif // !defined(__arm__)
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// If USE_BLX is defined, we could emit a 'mov ip, target', followed by a
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// 'blx ip'; however, the code would not be shorter than the above sequence
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// and the target address of the call would be referenced by the first
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// instruction rather than the second one, which would make it harder to patch
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// (two instructions before the return address, instead of one).
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ASSERT(kTargetAddrToReturnAddrDist == sizeof(Instr));
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}
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void MacroAssembler::Call(byte* target, RelocMode rmode, Condition cond) {
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ASSERT(!is_code_target(rmode));
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Call(reinterpret_cast<intptr_t>(target), rmode, cond);
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}
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void MacroAssembler::Call(Handle<Code> code, RelocMode rmode, Condition cond) {
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ASSERT(is_code_target(rmode));
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// 'code' is always generated ARM code, never THUMB code
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Call(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
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}
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void MacroAssembler::Ret() {
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#if USE_BX
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bx(lr);
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#else
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mov(pc, Operand(lr));
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#endif
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}
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// Will clobber 4 registers: object, offset, scratch, ip. The
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// register 'object' contains a heap object pointer. The heap object
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// tag is shifted away.
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void MacroAssembler::RecordWrite(Register object, Register offset,
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Register scratch) {
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// This is how much we shift the remembered set bit offset to get the
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// offset of the word in the remembered set. We divide by kBitsPerInt (32,
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// shift right 5) and then multiply by kIntSize (4, shift left 2).
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const int kRSetWordShift = 3;
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Label fast, done;
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2008-07-30 08:49:36 +00:00
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// First, test that the object is not in the new space. We cannot set
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// remembered set bits in the new space.
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// object: heap object pointer (with tag)
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// offset: offset to store location from the object
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2008-07-03 15:10:15 +00:00
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and_(scratch, object, Operand(Heap::NewSpaceMask()));
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cmp(scratch, Operand(ExternalReference::new_space_start()));
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b(eq, &done);
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// Compute the bit offset in the remembered set.
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2008-07-30 08:49:36 +00:00
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// object: heap object pointer (with tag)
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// offset: offset to store location from the object
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mov(ip, Operand(Page::kPageAlignmentMask)); // load mask only once
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and_(scratch, object, Operand(ip)); // offset into page of the object
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add(offset, scratch, Operand(offset)); // add offset into the object
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2008-07-03 15:10:15 +00:00
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mov(offset, Operand(offset, LSR, kObjectAlignmentBits));
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// Compute the page address from the heap object pointer.
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2008-07-30 08:49:36 +00:00
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// object: heap object pointer (with tag)
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// offset: bit offset of store position in the remembered set
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2008-07-03 15:10:15 +00:00
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bic(object, object, Operand(ip));
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// If the bit offset lies beyond the normal remembered set range, it is in
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// the extra remembered set area of a large object.
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2008-07-30 08:49:36 +00:00
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// object: page start
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// offset: bit offset of store position in the remembered set
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2008-07-03 15:10:15 +00:00
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cmp(offset, Operand(Page::kPageSize / kPointerSize));
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b(lt, &fast);
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// Adjust the bit offset to be relative to the start of the extra
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// remembered set and the start address to be the address of the extra
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// remembered set.
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sub(offset, offset, Operand(Page::kPageSize / kPointerSize));
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// Load the array length into 'scratch' and multiply by four to get the
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// size in bytes of the elements.
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ldr(scratch, MemOperand(object, Page::kObjectStartOffset
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+ FixedArray::kLengthOffset));
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mov(scratch, Operand(scratch, LSL, kObjectAlignmentBits));
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// Add the page header (including remembered set), array header, and array
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// body size to the page address.
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add(object, object, Operand(Page::kObjectStartOffset
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+ Array::kHeaderSize));
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add(object, object, Operand(scratch));
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bind(&fast);
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// Get address of the rset word.
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2008-07-30 08:49:36 +00:00
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// object: start of the remembered set (page start for the fast case)
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// offset: bit offset of store position in the remembered set
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bic(scratch, offset, Operand(kBitsPerInt - 1)); // clear the bit offset
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add(object, object, Operand(scratch, LSR, kRSetWordShift));
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// Get bit offset in the rset word.
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// object: address of remembered set word
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// offset: bit offset of store position
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2008-07-03 15:10:15 +00:00
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and_(offset, offset, Operand(kBitsPerInt - 1));
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ldr(scratch, MemOperand(object));
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mov(ip, Operand(1));
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orr(scratch, scratch, Operand(ip, LSL, offset));
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str(scratch, MemOperand(object));
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bind(&done);
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}
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2008-07-30 08:49:36 +00:00
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void MacroAssembler::EnterJSFrame(int argc) {
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2008-07-03 15:10:15 +00:00
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// Generate code entering a JS function called from a JS function
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// stack: receiver, arguments
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// r0: number of arguments (not including function, nor receiver)
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// r1: preserved
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// sp: stack pointer
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// fp: frame pointer
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// cp: callee's context
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// pp: caller's parameter pointer
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// lr: return address
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// compute parameter pointer before making changes
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// ip = sp + kPointerSize*(args_len+1); // +1 for receiver
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add(ip, sp, Operand(r0, LSL, kPointerSizeLog2));
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add(ip, ip, Operand(kPointerSize));
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// push extra parameters if we don't have enough
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// (this can only happen if argc > 0 to begin with)
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if (argc > 0) {
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Label loop, done;
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// assume enough arguments to be the most common case
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sub(r2, r0, Operand(argc), SetCC); // number of missing arguments
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b(ge, &done); // enough arguments
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// not enough arguments
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mov(r3, Operand(Factory::undefined_value()));
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bind(&loop);
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push(r3);
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add(r2, r2, Operand(1), SetCC);
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b(lt, &loop);
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bind(&done);
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}
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mov(r3, Operand(r0)); // args_len to be saved
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mov(r2, Operand(cp)); // context to be saved
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// push in reverse order: context (r2), args_len (r3), caller_pp, caller_fp,
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2008-07-30 08:49:36 +00:00
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// sp_on_exit (ip == pp, may be patched on exit), return address
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2008-07-03 15:10:15 +00:00
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stm(db_w, sp, r2.bit() | r3.bit() | pp.bit() | fp.bit() |
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2008-07-30 08:49:36 +00:00
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ip.bit() | lr.bit());
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2008-07-03 15:10:15 +00:00
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// Setup new frame pointer.
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add(fp, sp, Operand(-StandardFrameConstants::kContextOffset));
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mov(pp, Operand(ip)); // setup new parameter pointer
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mov(r0, Operand(0)); // spare slot to store caller code object during GC
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2008-08-13 09:32:07 +00:00
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push(r0);
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2008-07-03 15:10:15 +00:00
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// r1: preserved
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}
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2008-07-30 08:49:36 +00:00
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void MacroAssembler::ExitJSFrame(ExitJSFlag flag) {
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2008-07-03 15:10:15 +00:00
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// r0: result
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// sp: stack pointer
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// fp: frame pointer
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// pp: parameter pointer
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2008-07-30 08:49:36 +00:00
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if (flag == DO_NOT_RETURN) {
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2008-07-03 15:10:15 +00:00
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add(r3, fp, Operand(JavaScriptFrameConstants::kSavedRegistersOffset));
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}
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if (flag == DO_NOT_RETURN) {
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// restore sp as caller_sp (not as pp)
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str(r3, MemOperand(fp, JavaScriptFrameConstants::kSPOnExitOffset));
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}
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if (flag == DO_NOT_RETURN && generating_stub()) {
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// If we're generating a stub, we need to preserve the link
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// register to be able to return to the place the stub was called
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// from.
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mov(ip, Operand(lr));
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}
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mov(sp, Operand(fp)); // respect ABI stack constraint
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ldm(ia, sp, pp.bit() | fp.bit() | sp.bit() |
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((flag == RETURN) ? pc.bit() : lr.bit()));
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if (flag == DO_NOT_RETURN && generating_stub()) {
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// Return to the place where the stub was called without
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// clobbering the value of the link register.
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mov(pc, Operand(ip));
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}
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// r0: result
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// sp: points to function arg (if return) or to last arg (if no return)
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// fp: restored frame pointer
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// pp: restored parameter pointer
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}
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2008-08-06 10:02:49 +00:00
|
|
|
void MacroAssembler::InvokePrologue(const ParameterCount& expected,
|
|
|
|
const ParameterCount& actual,
|
|
|
|
Handle<Code> code_constant,
|
|
|
|
Register code_reg,
|
|
|
|
Label* done,
|
|
|
|
InvokeFlag flag) {
|
|
|
|
if (actual.is_immediate()) {
|
|
|
|
mov(r0, Operand(actual.immediate())); // Push the number of arguments.
|
|
|
|
} else {
|
|
|
|
if (!actual.reg().is(r0)) {
|
|
|
|
mov(r0, Operand(actual.reg()));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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,
|
|
|
|
RelocMode 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 code_reg = r3;
|
|
|
|
Register expected_reg = r2;
|
|
|
|
|
|
|
|
// Make sure that the code and expected registers do not collide with the
|
|
|
|
// actual register being passed in.
|
|
|
|
if (actual.is_reg()) {
|
|
|
|
if (actual.reg().is(code_reg)) {
|
|
|
|
code_reg = r4;
|
|
|
|
} else if (actual.reg().is(expected_reg)) {
|
|
|
|
expected_reg = r4;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2008-07-03 15:10:15 +00:00
|
|
|
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));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::PushTryHandler(CodeLocation try_location,
|
|
|
|
HandlerType type) {
|
|
|
|
ASSERT(StackHandlerConstants::kSize == 6 * kPointerSize); // adjust this code
|
|
|
|
// The pc (return address) is passed in register lr.
|
|
|
|
if (try_location == IN_JAVASCRIPT) {
|
|
|
|
stm(db_w, sp, pp.bit() | fp.bit() | lr.bit());
|
|
|
|
if (type == TRY_CATCH_HANDLER) {
|
|
|
|
mov(r3, Operand(StackHandler::TRY_CATCH));
|
|
|
|
} else {
|
|
|
|
mov(r3, Operand(StackHandler::TRY_FINALLY));
|
|
|
|
}
|
|
|
|
push(r3); // state
|
|
|
|
mov(r3, Operand(ExternalReference(Top::k_handler_address)));
|
|
|
|
ldr(r1, MemOperand(r3));
|
|
|
|
push(r1); // next sp
|
|
|
|
str(sp, MemOperand(r3)); // chain handler
|
2008-08-13 09:32:07 +00:00
|
|
|
mov(r0, Operand(Smi::FromInt(StackHandler::kCodeNotPresent))); // new TOS
|
|
|
|
push(r0);
|
2008-07-03 15:10:15 +00:00
|
|
|
} else {
|
|
|
|
// Must preserve r0-r3, r5-r7 are available.
|
|
|
|
ASSERT(try_location == IN_JS_ENTRY);
|
|
|
|
// The parameter pointer is meaningless here and fp does not point to a JS
|
|
|
|
// frame. So we save NULL for both pp and fp. We expect the code throwing an
|
|
|
|
// exception to check fp before dereferencing it to restore the context.
|
|
|
|
mov(pp, Operand(0)); // set pp to NULL
|
|
|
|
mov(ip, Operand(0)); // to save a NULL fp
|
|
|
|
stm(db_w, sp, pp.bit() | ip.bit() | lr.bit());
|
|
|
|
mov(r6, Operand(StackHandler::ENTRY));
|
|
|
|
push(r6); // state
|
|
|
|
mov(r7, Operand(ExternalReference(Top::k_handler_address)));
|
|
|
|
ldr(r6, MemOperand(r7));
|
|
|
|
push(r6); // next sp
|
|
|
|
str(sp, MemOperand(r7)); // chain handler
|
2008-08-13 09:32:07 +00:00
|
|
|
mov(r5, Operand(Smi::FromInt(StackHandler::kCodeNotPresent))); // new TOS
|
2008-07-03 15:10:15 +00:00
|
|
|
push(r5); // flush TOS
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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->IsJSGlobalObject() || !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->IsJSGlobalObject()) {
|
|
|
|
CheckAccessGlobal(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->IsJSGlobalObject() || !object->IsAccessCheckNeeded());
|
|
|
|
if (object->IsJSGlobalObject()) {
|
|
|
|
CheckAccessGlobal(reg, scratch, miss);
|
|
|
|
}
|
|
|
|
return reg;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::CheckAccessGlobal(Register holder_reg,
|
|
|
|
Register scratch,
|
|
|
|
Label* miss) {
|
|
|
|
ASSERT(!holder_reg.is(scratch));
|
|
|
|
|
|
|
|
// Load the security context.
|
|
|
|
mov(scratch, Operand(Top::security_context_address()));
|
|
|
|
ldr(scratch, MemOperand(scratch));
|
|
|
|
// In debug mode, make sure the security context is set.
|
|
|
|
if (kDebug) {
|
|
|
|
cmp(scratch, Operand(0));
|
|
|
|
Check(ne, "we should not have an empty security context");
|
|
|
|
}
|
|
|
|
|
|
|
|
// Load the global object of the security context.
|
|
|
|
int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
|
|
|
|
ldr(scratch, FieldMemOperand(scratch, offset));
|
|
|
|
// Check that the security token in the calling global object is
|
|
|
|
// compatible with the security token in the receiving global
|
|
|
|
// object.
|
|
|
|
ldr(scratch, FieldMemOperand(scratch, JSGlobalObject::kSecurityTokenOffset));
|
|
|
|
ldr(ip, FieldMemOperand(holder_reg, JSGlobalObject::kSecurityTokenOffset));
|
|
|
|
cmp(scratch, Operand(ip));
|
|
|
|
b(ne, miss);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::CallStub(CodeStub* stub) {
|
2008-07-30 08:49:36 +00:00
|
|
|
ASSERT(allow_stub_calls()); // stub calls are not allowed in some stubs
|
2008-07-03 15:10:15 +00:00
|
|
|
Call(stub->GetCode(), code_target);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::CallJSExitStub(CodeStub* stub) {
|
2008-07-30 08:49:36 +00:00
|
|
|
ASSERT(allow_stub_calls()); // stub calls are not allowed in some stubs
|
2008-07-03 15:10:15 +00:00
|
|
|
Call(stub->GetCode(), exit_js_frame);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::StubReturn(int argc) {
|
|
|
|
ASSERT(argc >= 1 && generating_stub());
|
|
|
|
if (argc > 1)
|
|
|
|
add(sp, sp, Operand((argc - 1) * kPointerSize));
|
|
|
|
Ret();
|
|
|
|
}
|
|
|
|
|
2008-08-13 09:32:07 +00:00
|
|
|
|
2008-07-03 15:10:15 +00:00
|
|
|
void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
|
2008-08-13 09:32:07 +00:00
|
|
|
// All parameters are on the stack. r0 has the return value after call.
|
2008-07-03 15:10:15 +00:00
|
|
|
|
2008-08-13 09:32:07 +00:00
|
|
|
// Either the expected number of arguments is unknown, or the actual
|
|
|
|
// number of arguments match the expectation.
|
|
|
|
ASSERT(f->nargs < 0 || f->nargs == num_arguments);
|
2008-07-03 15:10:15 +00:00
|
|
|
|
2008-08-13 09:32:07 +00:00
|
|
|
Runtime::FunctionId function_id =
|
|
|
|
static_cast<Runtime::FunctionId>(f->stub_id);
|
|
|
|
RuntimeStub stub(function_id, num_arguments);
|
2008-07-03 15:10:15 +00:00
|
|
|
CallStub(&stub);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
|
|
|
|
CallRuntime(Runtime::FunctionForId(fid), num_arguments);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2008-08-13 09:32:07 +00:00
|
|
|
void MacroAssembler::TailCallRuntime(const ExternalReference& ext,
|
|
|
|
int num_arguments) {
|
|
|
|
// 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));
|
|
|
|
JumpToBuiltin(ext);
|
2008-07-03 15:10:15 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::JumpToBuiltin(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;
|
|
|
|
Jump(stub.GetCode(), code_target);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void MacroAssembler::InvokeBuiltin(const char* name,
|
|
|
|
int argc,
|
|
|
|
InvokeJSFlags flags) {
|
|
|
|
Handle<String> symbol = Factory::LookupAsciiSymbol(name);
|
|
|
|
Object* object = Top::security_context_builtins()->GetProperty(*symbol);
|
|
|
|
bool unresolved = true;
|
|
|
|
Code* code = Builtins::builtin(Builtins::Illegal);
|
|
|
|
|
|
|
|
if (object->IsJSFunction()) {
|
|
|
|
Handle<JSFunction> function(JSFunction::cast(object));
|
|
|
|
if (function->is_compiled() || CompileLazy(function, CLEAR_EXCEPTION)) {
|
|
|
|
code = function->code();
|
|
|
|
unresolved = false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (flags == CALL_JS) {
|
|
|
|
Call(Handle<Code>(code), code_target);
|
|
|
|
} else {
|
|
|
|
ASSERT(flags == JUMP_JS);
|
|
|
|
Jump(Handle<Code>(code), code_target);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (unresolved) {
|
|
|
|
uint32_t flags =
|
|
|
|
Bootstrapper::FixupFlagsArgumentsCount::encode(argc) |
|
|
|
|
Bootstrapper::FixupFlagsIsPCRelative::encode(false);
|
|
|
|
Unresolved entry = { pc_offset() - sizeof(Instr), flags, name };
|
|
|
|
unresolved_.Add(entry);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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 aligment 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)));
|
2008-08-13 09:32:07 +00:00
|
|
|
push(r0);
|
2008-07-03 15:10:15 +00:00
|
|
|
CallRuntime(Runtime::kAbort, 2);
|
|
|
|
// will not return here
|
|
|
|
}
|
|
|
|
|
|
|
|
} } // namespace v8::internal
|