/js/src/methodjit/InlineFrameAssembler.h
http://github.com/zpao/v8monkey · C Header · 161 lines · 79 code · 24 blank · 58 comment · 6 complexity · 1648acb1d5ea3117fed0d1bf00157685 MD5 · raw file
- /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- * vim: set ts=4 sw=4 et tw=99:
- *
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
- * May 28, 2008.
- *
- * The Initial Developer of the Original Code is
- * Brendan Eich <brendan@mozilla.org>
- *
- * Contributor(s):
- * David Anderson <danderson@mozilla.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
- #if !defined jsjaeger_inl_frame_asm_h__ && defined JS_METHODJIT && defined JS_MONOIC
- #define jsjaeger_inl_frame_asm_h__
- #include "assembler/assembler/MacroAssembler.h"
- #include "assembler/assembler/CodeLocation.h"
- #include "methodjit/MethodJIT.h"
- #include "CodeGenIncludes.h"
- namespace js {
- namespace mjit {
- struct AdjustedFrame {
- AdjustedFrame(uint32_t baseOffset)
- : baseOffset(baseOffset)
- { }
- uint32_t baseOffset;
- JSC::MacroAssembler::Address addrOf(uint32_t offset) {
- return JSC::MacroAssembler::Address(JSFrameReg, baseOffset + offset);
- }
- };
- /*
- * This is used for emitting code to inline callee-side frame creation and
- * should jit code equivalent to StackFrame::initCallFrameCallerHalf.
- *
- * Once finished, JSFrameReg is advanced to be the new fp.
- */
- class InlineFrameAssembler {
- typedef JSC::MacroAssembler::RegisterID RegisterID;
- typedef JSC::MacroAssembler::Address Address;
- typedef JSC::MacroAssembler::Imm32 Imm32;
- typedef JSC::MacroAssembler::ImmPtr ImmPtr;
- typedef JSC::MacroAssembler::DataLabelPtr DataLabelPtr;
- Assembler &masm;
- FrameSize frameSize; // size of the caller's frame
- RegisterID funObjReg; // register containing the function object (callee)
- uint32_t flags; // frame flags
- public:
- /*
- * Register state, so consumers of this class can restrict which registers
- * can and can't be clobbered.
- */
- Registers tempRegs;
- InlineFrameAssembler(Assembler &masm, ic::CallICInfo &ic, uint32_t flags)
- : masm(masm), flags(flags), tempRegs(Registers::AvailRegs)
- {
- frameSize = ic.frameSize;
- funObjReg = ic.funObjReg;
- tempRegs.takeReg(funObjReg);
- }
- InlineFrameAssembler(Assembler &masm, Compiler::CallGenInfo &gen, uint32_t flags)
- : masm(masm), flags(flags), tempRegs(Registers::AvailRegs)
- {
- frameSize = gen.frameSize;
- funObjReg = gen.funObjReg;
- tempRegs.takeReg(funObjReg);
- }
- DataLabelPtr assemble(void *ncode, jsbytecode *pc)
- {
- JS_ASSERT((flags & ~StackFrame::CONSTRUCTING) == 0);
- /* Generate StackFrame::initCallFrameCallerHalf. */
- /* Get the actual flags to write. */
- JS_ASSERT(!(flags & ~StackFrame::CONSTRUCTING));
- uint32_t flags = this->flags | StackFrame::FUNCTION;
- if (frameSize.lowered(pc))
- flags |= StackFrame::LOWERED_CALL_APPLY;
- DataLabelPtr ncodePatch;
- if (frameSize.isStatic()) {
- uint32_t frameDepth = frameSize.staticLocalSlots();
- AdjustedFrame newfp(sizeof(StackFrame) + frameDepth * sizeof(Value));
- Address flagsAddr = newfp.addrOf(StackFrame::offsetOfFlags());
- masm.store32(Imm32(flags), flagsAddr);
- Address prevAddr = newfp.addrOf(StackFrame::offsetOfPrev());
- masm.storePtr(JSFrameReg, prevAddr);
- Address ncodeAddr = newfp.addrOf(StackFrame::offsetOfNcode());
- ncodePatch = masm.storePtrWithPatch(ImmPtr(ncode), ncodeAddr);
- masm.addPtr(Imm32(sizeof(StackFrame) + frameDepth * sizeof(Value)), JSFrameReg);
- } else {
- /*
- * If the frame size is dynamic, then the fast path generated by
- * generateFullCallStub must be used. Thus, this code is executed
- * after stubs::SplatApplyArgs has been called. SplatApplyArgs
- * stores the dynamic stack pointer (i.e., regs.sp after pushing a
- * dynamic number of arguments) to VMFrame.regs, so we just load it
- * here to get the new frame pointer.
- */
- RegisterID newfp = tempRegs.takeAnyReg().reg();
- masm.loadPtr(FrameAddress(VMFrame::offsetOfRegsSp()), newfp);
- Address flagsAddr(newfp, StackFrame::offsetOfFlags());
- masm.store32(Imm32(flags), flagsAddr);
- Address prevAddr(newfp, StackFrame::offsetOfPrev());
- masm.storePtr(JSFrameReg, prevAddr);
- Address ncodeAddr(newfp, StackFrame::offsetOfNcode());
- ncodePatch = masm.storePtrWithPatch(ImmPtr(ncode), ncodeAddr);
- masm.move(newfp, JSFrameReg);
- tempRegs.putReg(newfp);
- }
- return ncodePatch;
- }
- };
- } /* namespace mjit */
- } /* namespace js */
- #endif /* jsjaeger_inl_frame_asm_h__ */