2f0f6face1
This is a first step towards loading globals directly from property cells instead of going through a load IC. This change supports only properties with the DontDelete attribute since we are only able to bailout into the generic code generated by the secondary code generator the beginning of a function. The resulting fast-case code is specialized for a specific context. When invoked with a different global object, it will always bailout to the secondary code. When loading a property that does not exist at compile-time or a property that is deleteable we still generate the generic load IC. Review URL: http://codereview.chromium.org/565034 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3808 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
149 lines
4.9 KiB
C++
149 lines
4.9 KiB
C++
// Copyright 2010 the V8 project authors. All rights reserved.
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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 "codegen-inl.h"
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#include "fast-codegen.h"
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namespace v8 {
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namespace internal {
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#define __ ACCESS_MASM(masm())
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void FastCodeGenerator::EmitLoadReceiver(Register reg) {
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// Offset 2 is due to return address and saved frame pointer.
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int index = 2 + scope()->num_parameters();
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__ movq(reg, Operand(rbp, index * kPointerSize));
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}
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void FastCodeGenerator::EmitReceiverMapCheck() {
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Comment cmnt(masm(), ";; MapCheck(this)");
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if (FLAG_print_ir) {
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PrintF("MapCheck(this)\n");
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}
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ASSERT(info()->has_receiver() && info()->receiver()->IsHeapObject());
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Handle<HeapObject> object = Handle<HeapObject>::cast(info()->receiver());
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Handle<Map> map(object->map());
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EmitLoadReceiver(rdx);
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__ CheckMap(rdx, map, bailout(), false);
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}
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void FastCodeGenerator::EmitGlobalMapCheck() {
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Comment cmnt(masm(), ";; GlobalMapCheck");
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if (FLAG_print_ir) {
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PrintF(";; GlobalMapCheck()");
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}
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ASSERT(info()->has_global_object());
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Handle<Map> map(info()->global_object()->map());
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__ movq(rbx, CodeGenerator::GlobalObject());
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__ CheckMap(rbx, map, bailout(), true);
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}
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void FastCodeGenerator::EmitGlobalVariableLoad(Handle<Object> cell) {
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ASSERT(cell->IsJSGlobalPropertyCell());
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__ Move(rax, cell);
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__ movq(rax, FieldOperand(rax, JSGlobalPropertyCell::kValueOffset));
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if (FLAG_debug_code) {
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__ Cmp(rax, Factory::the_hole_value());
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__ Check(not_equal, "DontDelete cells can't contain the hole");
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}
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}
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void FastCodeGenerator::EmitThisPropertyStore(Handle<String> name) {
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LookupResult lookup;
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info()->receiver()->Lookup(*name, &lookup);
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ASSERT(lookup.holder() == *info()->receiver());
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ASSERT(lookup.type() == FIELD);
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Handle<Map> map(Handle<HeapObject>::cast(info()->receiver())->map());
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int index = lookup.GetFieldIndex() - map->inobject_properties();
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int offset = index * kPointerSize;
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// Negative offsets are inobject properties.
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if (offset < 0) {
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offset += map->instance_size();
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__ movq(rcx, rdx); // Copy receiver for write barrier.
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} else {
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offset += FixedArray::kHeaderSize;
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__ movq(rcx, FieldOperand(rdx, JSObject::kPropertiesOffset));
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}
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// Perform the store.
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__ movq(FieldOperand(rcx, offset), rax);
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// Preserve value from write barrier in case it's needed.
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__ movq(rbx, rax);
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__ RecordWrite(rcx, offset, rbx, rdi);
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}
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void FastCodeGenerator::Generate(CompilationInfo* compilation_info) {
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ASSERT(info_ == NULL);
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info_ = compilation_info;
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// Save the caller's frame pointer and set up our own.
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Comment prologue_cmnt(masm(), ";; Prologue");
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__ push(rbp);
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__ movq(rbp, rsp);
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__ push(rsi); // Context.
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__ push(rdi); // Closure.
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// Note that we keep a live register reference to esi (context) at this
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// point.
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// Receiver (this) is allocated to rdx if there are this properties.
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if (info()->has_this_properties()) EmitReceiverMapCheck();
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// If there is a global variable access check if the global object
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// is the same as at lazy-compilation time.
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if (info()->has_globals()) EmitGlobalMapCheck();
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VisitStatements(info()->function()->body());
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Comment return_cmnt(masm(), ";; Return(<undefined>)");
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__ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
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Comment epilogue_cmnt(masm(), ";; Epilogue");
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__ movq(rsp, rbp);
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__ pop(rbp);
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__ ret((scope()->num_parameters() + 1) * kPointerSize);
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__ bind(&bailout_);
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}
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#undef __
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} } // namespace v8::internal
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