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/* -*- 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 baseOffset)
: baseOffset(baseOffset)
{ }
uint32 baseOffset;
JSC::MacroAssembler::Address addrOf(uint32 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 JSStackFrame::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)
jsbytecode *pc; // bytecode location at the caller call site
uint32 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 flags)
: masm(masm), pc(ic.pc), flags(flags)
{
frameSize = ic.frameSize;
funObjReg = ic.funObjReg;
tempRegs.takeReg(ic.funPtrReg);
tempRegs.takeReg(funObjReg);
}
InlineFrameAssembler(Assembler &masm, Compiler::CallGenInfo &gen, uint32 flags)
: masm(masm), pc(gen.pc), flags(flags)
{
frameSize = gen.frameSize;
funObjReg = gen.funObjReg;
tempRegs.takeReg(funObjReg);
}
DataLabelPtr assemble(void *ncode)
{
JS_ASSERT((flags & ~JSFRAME_CONSTRUCTING) == 0);
/* Generate JSStackFrame::initCallFrameCallerHalf. */
DataLabelPtr ncodePatch;
if (frameSize.isStatic()) {
uint32 frameDepth = frameSize.staticLocalSlots();
AdjustedFrame newfp(sizeof(JSStackFrame) + frameDepth * sizeof(Value));
Address flagsAddr = newfp.addrOf(JSStackFrame::offsetOfFlags());
masm.store32(Imm32(JSFRAME_FUNCTION | flags), flagsAddr);
Address prevAddr = newfp.addrOf(JSStackFrame::offsetOfPrev());
masm.storePtr(JSFrameReg, prevAddr);
Address ncodeAddr = newfp.addrOf(JSStackFrame::offsetOfncode());
ncodePatch = masm.storePtrWithPatch(ImmPtr(ncode), ncodeAddr);
masm.addPtr(Imm32(sizeof(JSStackFrame) + 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();
masm.loadPtr(FrameAddress(offsetof(VMFrame, regs.sp)), newfp);
Address flagsAddr(newfp, JSStackFrame::offsetOfFlags());
masm.store32(Imm32(JSFRAME_FUNCTION | flags), flagsAddr);
Address prevAddr(newfp, JSStackFrame::offsetOfPrev());
masm.storePtr(JSFrameReg, prevAddr);
Address ncodeAddr(newfp, JSStackFrame::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__ */
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