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android_external_webkit/JavaScriptCore/jit/JITCall.cpp at froyo-arabic · samer72/android_external_webkit · GitHub
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/*
* Copyright (C) 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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
"
config.h
"
#
include
"
JIT.h
"
#
if
ENABLE(JIT)
#
include
"
CodeBlock.h
"
#
include
"
JITInlineMethods.h
"
#
include
"
JITStubCall.h
"
#
include
"
JSArray.h
"
#
include
"
JSFunction.h
"
#
include
"
Interpreter.h
"
#
include
"
ResultType.h
"
#
include
"
SamplingTool.h
"
#
ifndef
NDEBUG
#
include
<
stdio.h
>
#
endif
using
namespace
std
;
namespace
JSC
{
#
if
USE(JSVALUE32_64)
void
JIT::compileOpCallInitializeCallFrame
()
{
//
regT0 holds callee, regT1 holds argCount
store32
(regT1,
Address
(callFrameRegister, RegisterFile::ArgumentCount *
static_cast
<
int
>(
sizeof
(Register))));
loadPtr
(
Address
(regT0,
OBJECT_OFFSETOF
(JSFunction, m_data) +
OBJECT_OFFSETOF
(ScopeChain, m_node)), regT1);
//
scopeChain
emitStore
(
static_cast
<
unsigned
>(RegisterFile::OptionalCalleeArguments),
JSValue
());
storePtr
(regT0,
Address
(callFrameRegister, RegisterFile::Callee *
static_cast
<
int
>(
sizeof
(Register))));
//
callee
storePtr
(regT1,
Address
(callFrameRegister, RegisterFile::ScopeChain *
static_cast
<
int
>(
sizeof
(Register))));
//
scopeChain
}
void
JIT::compileOpCallSetupArgs
(Instruction* instruction)
{
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
emitPutJITStubArg
(regT1, regT0,
0
);
emitPutJITStubArgConstant
(registerOffset,
1
);
emitPutJITStubArgConstant
(argCount,
2
);
}
void
JIT::compileOpConstructSetupArgs
(Instruction* instruction)
{
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
int
proto = instruction[
5
].
u
.
operand
;
int
thisRegister = instruction[
6
].
u
.
operand
;
emitPutJITStubArg
(regT1, regT0,
0
);
emitPutJITStubArgConstant
(registerOffset,
1
);
emitPutJITStubArgConstant
(argCount,
2
);
emitPutJITStubArgFromVirtualRegister
(proto,
3
, regT2, regT3);
emitPutJITStubArgConstant
(thisRegister,
4
);
}
void
JIT::compileOpCallVarargsSetupArgs
(Instruction*)
{
emitPutJITStubArg
(regT1, regT0,
0
);
emitPutJITStubArg
(regT3,
1
);
//
registerOffset
emitPutJITStubArg
(regT2,
2
);
//
argCount
}
void
JIT::compileOpCallVarargs
(Instruction* instruction)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCountRegister = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
emitLoad
(callee, regT1, regT0);
emitLoadPayload
(argCountRegister, regT2);
//
argCount
addPtr
(
Imm32
(registerOffset), regT2, regT3);
//
registerOffset
compileOpCallVarargsSetupArgs
(instruction);
emitJumpSlowCaseIfNotJSCell
(callee, regT1);
addSlowCase
(
branchPtr
(NotEqual,
Address
(regT0),
ImmPtr
(m_globalData->
jsFunctionVPtr
)));
//
Speculatively roll the callframe, assuming argCount will match the arity.
mul32
(
Imm32
(
sizeof
(Register)), regT3, regT3);
addPtr
(callFrameRegister, regT3);
storePtr
(callFrameRegister,
Address
(regT3, RegisterFile::CallerFrame *
static_cast
<
int
>(
sizeof
(Register))));
move
(regT3, callFrameRegister);
move
(regT2, regT1);
//
argCount
emitNakedCall
(m_globalData->
jitStubs
.
ctiVirtualCall
());
emitStore
(dst, regT1, regT0);
sampleCodeBlock
(m_codeBlock);
}
void
JIT::compileOpCallVarargsSlowCase
(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
linkSlowCaseIfNotJSCell
(iter, callee);
linkSlowCase
(iter);
JITStubCall
stubCall
(
this
, cti_op_call_NotJSFunction);
stubCall.
call
(dst);
//
In the interpreter, the callee puts the return value in dst.
map
(m_bytecodeIndex +
OPCODE_LENGTH
(op_call_varargs), dst, regT1, regT0);
sampleCodeBlock
(m_codeBlock);
}
void
JIT::emit_op_ret
(Instruction* currentInstruction)
{
unsigned
dst = currentInstruction[
1
].
u
.
operand
;
//
We could JIT generate the deref, only calling out to C when the refcount hits zero.
if
(m_codeBlock->
needsFullScopeChain
())
JITStubCall
(
this
, cti_op_ret_scopeChain).
call
();
emitLoad
(dst, regT1, regT0);
emitGetFromCallFrameHeaderPtr
(RegisterFile::ReturnPC, regT2);
emitGetFromCallFrameHeaderPtr
(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn
(regT2);
ret
();
}
void
JIT::emit_op_construct_verify
(Instruction* currentInstruction)
{
unsigned
dst = currentInstruction[
1
].
u
.
operand
;
emitLoad
(dst, regT1, regT0);
addSlowCase
(
branch32
(NotEqual, regT1,
Imm32
(JSValue::CellTag)));
loadPtr
(
Address
(regT0,
OBJECT_OFFSETOF
(JSCell, m_structure)), regT2);
addSlowCase
(
branch32
(NotEqual,
Address
(regT2,
OBJECT_OFFSETOF
(Structure, m_typeInfo) +
OBJECT_OFFSETOF
(TypeInfo, m_type)),
Imm32
(ObjectType)));
}
void
JIT::emitSlow_op_construct_verify
(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned
dst = currentInstruction[
1
].
u
.
operand
;
unsigned
src = currentInstruction[
2
].
u
.
operand
;
linkSlowCase
(iter);
linkSlowCase
(iter);
emitLoad
(src, regT1, regT0);
emitStore
(dst, regT1, regT0);
}
void
JIT::emitSlow_op_call
(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase
(currentInstruction, iter, m_callLinkInfoIndex++, op_call);
}
void
JIT::emitSlow_op_call_eval
(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase
(currentInstruction, iter, m_callLinkInfoIndex++, op_call_eval);
}
void
JIT::emitSlow_op_call_varargs
(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallVarargsSlowCase
(currentInstruction, iter);
}
void
JIT::emitSlow_op_construct
(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
compileOpCallSlowCase
(currentInstruction, iter, m_callLinkInfoIndex++, op_construct);
}
void
JIT::emit_op_call
(Instruction* currentInstruction)
{
compileOpCall
(op_call, currentInstruction, m_callLinkInfoIndex++);
}
void
JIT::emit_op_call_eval
(Instruction* currentInstruction)
{
compileOpCall
(op_call_eval, currentInstruction, m_callLinkInfoIndex++);
}
void
JIT::emit_op_load_varargs
(Instruction* currentInstruction)
{
int
argCountDst = currentInstruction[
1
].
u
.
operand
;
int
argsOffset = currentInstruction[
2
].
u
.
operand
;
JITStubCall
stubCall
(
this
, cti_op_load_varargs);
stubCall.
addArgument
(
Imm32
(argsOffset));
stubCall.
call
();
//
Stores a naked int32 in the register file.
store32
(returnValueRegister,
Address
(callFrameRegister, argCountDst *
sizeof
(Register)));
}
void
JIT::emit_op_call_varargs
(Instruction* currentInstruction)
{
compileOpCallVarargs
(currentInstruction);
}
void
JIT::emit_op_construct
(Instruction* currentInstruction)
{
compileOpCall
(op_construct, currentInstruction, m_callLinkInfoIndex++);
}
#
if
!ENABLE(JIT_OPTIMIZE_CALL)
/*
------------------------------ BEGIN: !ENABLE(JIT_OPTIMIZE_CALL) ------------------------------
*/
void
JIT::compileOpCall
(OpcodeID opcodeID, Instruction* instruction,
unsigned
)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
Jump wasEval;
if
(opcodeID == op_call_eval) {
JITStubCall
stubCall
(
this
, cti_op_call_eval);
stubCall.
addArgument
(callee);
stubCall.
addArgument
(
JIT::Imm32
(registerOffset));
stubCall.
addArgument
(
JIT::Imm32
(argCount));
stubCall.
call
();
wasEval =
branch32
(NotEqual, regT1,
Imm32
(JSValue::EmptyValueTag));
}
emitLoad
(callee, regT1, regT0);
if
(opcodeID == op_call)
compileOpCallSetupArgs
(instruction);
else
if
(opcodeID == op_construct)
compileOpConstructSetupArgs
(instruction);
emitJumpSlowCaseIfNotJSCell
(callee, regT1);
addSlowCase
(
branchPtr
(NotEqual,
Address
(regT0),
ImmPtr
(m_globalData->
jsFunctionVPtr
)));
//
First, in the case of a construct, allocate the new object.
if
(opcodeID == op_construct) {
JITStubCall
(
this
, cti_op_construct_JSConstruct).
call
(registerOffset - RegisterFile::CallFrameHeaderSize - argCount);
emitLoad
(callee, regT1, regT0);
}
//
Speculatively roll the callframe, assuming argCount will match the arity.
storePtr
(callFrameRegister,
Address
(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) *
static_cast
<
int
>(
sizeof
(Register))));
addPtr
(
Imm32
(registerOffset *
static_cast
<
int
>(
sizeof
(Register))), callFrameRegister);
move
(
Imm32
(argCount), regT1);
emitNakedCall
(m_globalData->
jitStubs
.
ctiVirtualCall
());
if
(opcodeID == op_call_eval)
wasEval.
link
(
this
);
emitStore
(dst, regT1, regT0);
sampleCodeBlock
(m_codeBlock);
}
void
JIT::compileOpCallSlowCase
(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter,
unsigned
, OpcodeID opcodeID)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
linkSlowCaseIfNotJSCell
(iter, callee);
linkSlowCase
(iter);
JITStubCall
stubCall
(
this
, opcodeID == op_construct ? cti_op_construct_NotJSConstruct : cti_op_call_NotJSFunction);
stubCall.
call
(dst);
//
In the interpreter, the callee puts the return value in dst.
sampleCodeBlock
(m_codeBlock);
}
#
else
//
!ENABLE(JIT_OPTIMIZE_CALL)
/*
------------------------------ BEGIN: ENABLE(JIT_OPTIMIZE_CALL) ------------------------------
*/
void
JIT::compileOpCall
(OpcodeID opcodeID, Instruction* instruction,
unsigned
callLinkInfoIndex)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
Jump wasEval;
if
(opcodeID == op_call_eval) {
JITStubCall
stubCall
(
this
, cti_op_call_eval);
stubCall.
addArgument
(callee);
stubCall.
addArgument
(
JIT::Imm32
(registerOffset));
stubCall.
addArgument
(
JIT::Imm32
(argCount));
stubCall.
call
();
wasEval =
branch32
(NotEqual, regT1,
Imm32
(JSValue::EmptyValueTag));
}
emitLoad
(callee, regT1, regT0);
DataLabelPtr addressOfLinkedFunctionCheck;
BEGIN_UNINTERRUPTED_SEQUENCE
(sequenceOpCall);
Jump jumpToSlow =
branchPtrWithPatch
(NotEqual, regT0, addressOfLinkedFunctionCheck,
ImmPtr
(
0
));
END_UNINTERRUPTED_SEQUENCE
(sequenceOpCall);
addSlowCase
(jumpToSlow);
ASSERT
(
differenceBetween
(addressOfLinkedFunctionCheck, jumpToSlow) == patchOffsetOpCallCompareToJump);
m_callStructureStubCompilationInfo[callLinkInfoIndex].
hotPathBegin
= addressOfLinkedFunctionCheck;
addSlowCase
(
branch32
(NotEqual, regT1,
Imm32
(JSValue::CellTag)));
//
The following is the fast case, only used whan a callee can be linked.
//
In the case of OpConstruct, call out to a cti_ function to create the new object.
if
(opcodeID == op_construct) {
int
proto = instruction[
5
].
u
.
operand
;
int
thisRegister = instruction[
6
].
u
.
operand
;
JITStubCall
stubCall
(
this
, cti_op_construct_JSConstruct);
stubCall.
addArgument
(regT1, regT0);
stubCall.
addArgument
(
Imm32
(
0
));
//
FIXME: Remove this unused JITStub argument.
stubCall.
addArgument
(
Imm32
(
0
));
//
FIXME: Remove this unused JITStub argument.
stubCall.
addArgument
(proto);
stubCall.
call
(thisRegister);
emitLoad
(callee, regT1, regT0);
}
//
Fast version of stack frame initialization, directly relative to edi.
//
Note that this omits to set up RegisterFile::CodeBlock, which is set in the callee
emitStore
(registerOffset + RegisterFile::OptionalCalleeArguments,
JSValue
());
emitStore
(registerOffset + RegisterFile::Callee, regT1, regT0);
loadPtr
(
Address
(regT0,
OBJECT_OFFSETOF
(JSFunction, m_data) +
OBJECT_OFFSETOF
(ScopeChain, m_node)), regT1);
//
newScopeChain
store32
(
Imm32
(argCount),
Address
(callFrameRegister, (registerOffset + RegisterFile::ArgumentCount) *
static_cast
<
int
>(
sizeof
(Register))));
storePtr
(callFrameRegister,
Address
(callFrameRegister, (registerOffset + RegisterFile::CallerFrame) *
static_cast
<
int
>(
sizeof
(Register))));
storePtr
(regT1,
Address
(callFrameRegister, (registerOffset + RegisterFile::ScopeChain) *
static_cast
<
int
>(
sizeof
(Register))));
addPtr
(
Imm32
(registerOffset *
sizeof
(Register)), callFrameRegister);
//
Call to the callee
m_callStructureStubCompilationInfo[callLinkInfoIndex].
hotPathOther
=
emitNakedCall
();
if
(opcodeID == op_call_eval)
wasEval.
link
(
this
);
//
Put the return value in dst. In the interpreter, op_ret does this.
emitStore
(dst, regT1, regT0);
map
(m_bytecodeIndex + opcodeLengths[opcodeID], dst, regT1, regT0);
sampleCodeBlock
(m_codeBlock);
}
void
JIT::compileOpCallSlowCase
(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter,
unsigned
callLinkInfoIndex, OpcodeID opcodeID)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
linkSlowCase
(iter);
linkSlowCase
(iter);
//
The arguments have been set up on the hot path for op_call_eval
if
(opcodeID == op_call)
compileOpCallSetupArgs
(instruction);
else
if
(opcodeID == op_construct)
compileOpConstructSetupArgs
(instruction);
//
Fast check for JS function.
Jump callLinkFailNotObject =
branch32
(NotEqual, regT1,
Imm32
(JSValue::CellTag));
Jump callLinkFailNotJSFunction =
branchPtr
(NotEqual,
Address
(regT0),
ImmPtr
(m_globalData->
jsFunctionVPtr
));
//
First, in the case of a construct, allocate the new object.
if
(opcodeID == op_construct) {
JITStubCall
(
this
, cti_op_construct_JSConstruct).
call
(registerOffset - RegisterFile::CallFrameHeaderSize - argCount);
emitLoad
(callee, regT1, regT0);
}
//
Speculatively roll the callframe, assuming argCount will match the arity.
storePtr
(callFrameRegister,
Address
(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) *
static_cast
<
int
>(
sizeof
(Register))));
addPtr
(
Imm32
(registerOffset *
static_cast
<
int
>(
sizeof
(Register))), callFrameRegister);
move
(
Imm32
(argCount), regT1);
m_callStructureStubCompilationInfo[callLinkInfoIndex].
callReturnLocation
=
emitNakedCall
(m_globalData->
jitStubs
.
ctiVirtualCallLink
());
//
Put the return value in dst.
emitStore
(dst, regT1, regT0);;
sampleCodeBlock
(m_codeBlock);
//
If not, we need an extra case in the if below!
ASSERT
(
OPCODE_LENGTH
(op_call) ==
OPCODE_LENGTH
(op_call_eval));
//
Done! - return back to the hot path.
if
(opcodeID == op_construct)
emitJumpSlowToHot
(
jump
(),
OPCODE_LENGTH
(op_construct));
else
emitJumpSlowToHot
(
jump
(),
OPCODE_LENGTH
(op_call));
//
This handles host functions
callLinkFailNotObject.
link
(
this
);
callLinkFailNotJSFunction.
link
(
this
);
JITStubCall
(
this
, opcodeID == op_construct ? cti_op_construct_NotJSConstruct : cti_op_call_NotJSFunction).
call
();
emitStore
(dst, regT1, regT0);;
sampleCodeBlock
(m_codeBlock);
}
/*
------------------------------ END: !ENABLE / ENABLE(JIT_OPTIMIZE_CALL) ------------------------------
*/
#
endif
//
!ENABLE(JIT_OPTIMIZE_CALL)
#
else
//
USE(JSVALUE32_64)
void
JIT::compileOpCallInitializeCallFrame
()
{
store32
(regT1,
Address
(callFrameRegister, RegisterFile::ArgumentCount *
static_cast
<
int
>(
sizeof
(Register))));
loadPtr
(
Address
(regT0,
OBJECT_OFFSETOF
(JSFunction, m_data) +
OBJECT_OFFSETOF
(ScopeChain, m_node)), regT1);
//
newScopeChain
storePtr
(
ImmPtr
(
JSValue::encode
(
JSValue
())),
Address
(callFrameRegister, RegisterFile::OptionalCalleeArguments *
static_cast
<
int
>(
sizeof
(Register))));
storePtr
(regT0,
Address
(callFrameRegister, RegisterFile::Callee *
static_cast
<
int
>(
sizeof
(Register))));
storePtr
(regT1,
Address
(callFrameRegister, RegisterFile::ScopeChain *
static_cast
<
int
>(
sizeof
(Register))));
}
void
JIT::compileOpCallSetupArgs
(Instruction* instruction)
{
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
//
ecx holds func
emitPutJITStubArg
(regT0,
0
);
emitPutJITStubArgConstant
(argCount,
2
);
emitPutJITStubArgConstant
(registerOffset,
1
);
}
void
JIT::compileOpCallVarargsSetupArgs
(Instruction* instruction)
{
int
registerOffset = instruction[
4
].
u
.
operand
;
//
ecx holds func
emitPutJITStubArg
(regT0,
0
);
emitPutJITStubArg
(regT1,
2
);
addPtr
(
Imm32
(registerOffset), regT1, regT2);
emitPutJITStubArg
(regT2,
1
);
}
void
JIT::compileOpConstructSetupArgs
(Instruction* instruction)
{
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
int
proto = instruction[
5
].
u
.
operand
;
int
thisRegister = instruction[
6
].
u
.
operand
;
//
ecx holds func
emitPutJITStubArg
(regT0,
0
);
emitPutJITStubArgConstant
(registerOffset,
1
);
emitPutJITStubArgConstant
(argCount,
2
);
emitPutJITStubArgFromVirtualRegister
(proto,
3
, regT2);
emitPutJITStubArgConstant
(thisRegister,
4
);
}
void
JIT::compileOpCallVarargs
(Instruction* instruction)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCountRegister = instruction[
3
].
u
.
operand
;
emitGetVirtualRegister
(argCountRegister, regT1);
emitGetVirtualRegister
(callee, regT0);
compileOpCallVarargsSetupArgs
(instruction);
//
Check for JSFunctions.
emitJumpSlowCaseIfNotJSCell
(regT0);
addSlowCase
(
branchPtr
(NotEqual,
Address
(regT0),
ImmPtr
(m_globalData->
jsFunctionVPtr
)));
//
Speculatively roll the callframe, assuming argCount will match the arity.
mul32
(
Imm32
(
sizeof
(Register)), regT2, regT2);
intptr_t
offset = (
intptr_t
)
sizeof
(Register) * (
intptr_t
)RegisterFile::CallerFrame;
addPtr
(
Imm32
((
int32_t
)offset), regT2, regT3);
addPtr
(callFrameRegister, regT3);
storePtr
(callFrameRegister, regT3);
addPtr
(regT2, callFrameRegister);
emitNakedCall
(m_globalData->
jitStubs
.
ctiVirtualCall
());
//
Put the return value in dst. In the interpreter, op_ret does this.
emitPutVirtualRegister
(dst);
sampleCodeBlock
(m_codeBlock);
}
void
JIT::compileOpCallVarargsSlowCase
(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter)
{
int
dst = instruction[
1
].
u
.
operand
;
linkSlowCase
(iter);
linkSlowCase
(iter);
JITStubCall
stubCall
(
this
, cti_op_call_NotJSFunction);
stubCall.
call
(dst);
//
In the interpreter, the callee puts the return value in dst.
sampleCodeBlock
(m_codeBlock);
}
#
if
!ENABLE(JIT_OPTIMIZE_CALL)
/*
------------------------------ BEGIN: !ENABLE(JIT_OPTIMIZE_CALL) ------------------------------
*/
void
JIT::compileOpCall
(OpcodeID opcodeID, Instruction* instruction,
unsigned
)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
//
Handle eval
Jump wasEval;
if
(opcodeID == op_call_eval) {
JITStubCall
stubCall
(
this
, cti_op_call_eval);
stubCall.
addArgument
(callee, regT0);
stubCall.
addArgument
(
JIT::Imm32
(registerOffset));
stubCall.
addArgument
(
JIT::Imm32
(argCount));
stubCall.
call
();
wasEval =
branchPtr
(NotEqual, regT0,
ImmPtr
(
JSValue::encode
(
JSValue
())));
}
emitGetVirtualRegister
(callee, regT0);
//
The arguments have been set up on the hot path for op_call_eval
if
(opcodeID == op_call)
compileOpCallSetupArgs
(instruction);
else
if
(opcodeID == op_construct)
compileOpConstructSetupArgs
(instruction);
//
Check for JSFunctions.
emitJumpSlowCaseIfNotJSCell
(regT0);
addSlowCase
(
branchPtr
(NotEqual,
Address
(regT0),
ImmPtr
(m_globalData->
jsFunctionVPtr
)));
//
First, in the case of a construct, allocate the new object.
if
(opcodeID == op_construct) {
JITStubCall
(
this
, cti_op_construct_JSConstruct).
call
(registerOffset - RegisterFile::CallFrameHeaderSize - argCount);
emitGetVirtualRegister
(callee, regT0);
}
//
Speculatively roll the callframe, assuming argCount will match the arity.
storePtr
(callFrameRegister,
Address
(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) *
static_cast
<
int
>(
sizeof
(Register))));
addPtr
(
Imm32
(registerOffset *
static_cast
<
int
>(
sizeof
(Register))), callFrameRegister);
move
(
Imm32
(argCount), regT1);
emitNakedCall
(m_globalData->
jitStubs
.
ctiVirtualCall
());
if
(opcodeID == op_call_eval)
wasEval.
link
(
this
);
//
Put the return value in dst. In the interpreter, op_ret does this.
emitPutVirtualRegister
(dst);
sampleCodeBlock
(m_codeBlock);
}
void
JIT::compileOpCallSlowCase
(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter,
unsigned
, OpcodeID opcodeID)
{
int
dst = instruction[
1
].
u
.
operand
;
linkSlowCase
(iter);
linkSlowCase
(iter);
JITStubCall
stubCall
(
this
, opcodeID == op_construct ? cti_op_construct_NotJSConstruct : cti_op_call_NotJSFunction);
stubCall.
call
(dst);
//
In the interpreter, the callee puts the return value in dst.
sampleCodeBlock
(m_codeBlock);
}
#
else
//
!ENABLE(JIT_OPTIMIZE_CALL)
/*
------------------------------ BEGIN: ENABLE(JIT_OPTIMIZE_CALL) ------------------------------
*/
void
JIT::compileOpCall
(OpcodeID opcodeID, Instruction* instruction,
unsigned
callLinkInfoIndex)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
//
Handle eval
Jump wasEval;
if
(opcodeID == op_call_eval) {
JITStubCall
stubCall
(
this
, cti_op_call_eval);
stubCall.
addArgument
(callee, regT0);
stubCall.
addArgument
(
JIT::Imm32
(registerOffset));
stubCall.
addArgument
(
JIT::Imm32
(argCount));
stubCall.
call
();
wasEval =
branchPtr
(NotEqual, regT0,
ImmPtr
(
JSValue::encode
(
JSValue
())));
}
//
This plants a check for a cached JSFunction value, so we can plant a fast link to the callee.
//
This deliberately leaves the callee in ecx, used when setting up the stack frame below
emitGetVirtualRegister
(callee, regT0);
DataLabelPtr addressOfLinkedFunctionCheck;
BEGIN_UNINTERRUPTED_SEQUENCE
(sequenceOpCall);
Jump jumpToSlow =
branchPtrWithPatch
(NotEqual, regT0, addressOfLinkedFunctionCheck,
ImmPtr
(
JSValue::encode
(
JSValue
())));
END_UNINTERRUPTED_SEQUENCE
(sequenceOpCall);
addSlowCase
(jumpToSlow);
ASSERT_JIT_OFFSET
(
differenceBetween
(addressOfLinkedFunctionCheck, jumpToSlow), patchOffsetOpCallCompareToJump);
m_callStructureStubCompilationInfo[callLinkInfoIndex].
hotPathBegin
= addressOfLinkedFunctionCheck;
//
The following is the fast case, only used whan a callee can be linked.
//
In the case of OpConstruct, call out to a cti_ function to create the new object.
if
(opcodeID == op_construct) {
int
proto = instruction[
5
].
u
.
operand
;
int
thisRegister = instruction[
6
].
u
.
operand
;
emitPutJITStubArg
(regT0,
0
);
emitPutJITStubArgFromVirtualRegister
(proto,
3
, regT2);
JITStubCall
stubCall
(
this
, cti_op_construct_JSConstruct);
stubCall.
call
(thisRegister);
emitGetVirtualRegister
(callee, regT0);
}
//
Fast version of stack frame initialization, directly relative to edi.
//
Note that this omits to set up RegisterFile::CodeBlock, which is set in the callee
storePtr
(
ImmPtr
(
JSValue::encode
(
JSValue
())),
Address
(callFrameRegister, (registerOffset + RegisterFile::OptionalCalleeArguments) *
static_cast
<
int
>(
sizeof
(Register))));
storePtr
(regT0,
Address
(callFrameRegister, (registerOffset + RegisterFile::Callee) *
static_cast
<
int
>(
sizeof
(Register))));
loadPtr
(
Address
(regT0,
OBJECT_OFFSETOF
(JSFunction, m_data) +
OBJECT_OFFSETOF
(ScopeChain, m_node)), regT1);
//
newScopeChain
store32
(
Imm32
(argCount),
Address
(callFrameRegister, (registerOffset + RegisterFile::ArgumentCount) *
static_cast
<
int
>(
sizeof
(Register))));
storePtr
(callFrameRegister,
Address
(callFrameRegister, (registerOffset + RegisterFile::CallerFrame) *
static_cast
<
int
>(
sizeof
(Register))));
storePtr
(regT1,
Address
(callFrameRegister, (registerOffset + RegisterFile::ScopeChain) *
static_cast
<
int
>(
sizeof
(Register))));
addPtr
(
Imm32
(registerOffset *
sizeof
(Register)), callFrameRegister);
//
Call to the callee
m_callStructureStubCompilationInfo[callLinkInfoIndex].
hotPathOther
=
emitNakedCall
();
if
(opcodeID == op_call_eval)
wasEval.
link
(
this
);
//
Put the return value in dst. In the interpreter, op_ret does this.
emitPutVirtualRegister
(dst);
sampleCodeBlock
(m_codeBlock);
}
void
JIT::compileOpCallSlowCase
(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter,
unsigned
callLinkInfoIndex, OpcodeID opcodeID)
{
int
dst = instruction[
1
].
u
.
operand
;
int
callee = instruction[
2
].
u
.
operand
;
int
argCount = instruction[
3
].
u
.
operand
;
int
registerOffset = instruction[
4
].
u
.
operand
;
linkSlowCase
(iter);
//
The arguments have been set up on the hot path for op_call_eval
if
(opcodeID == op_call)
compileOpCallSetupArgs
(instruction);
else
if
(opcodeID == op_construct)
compileOpConstructSetupArgs
(instruction);
//
Fast check for JS function.
Jump callLinkFailNotObject =
emitJumpIfNotJSCell
(regT0);
Jump callLinkFailNotJSFunction =
branchPtr
(NotEqual,
Address
(regT0),
ImmPtr
(m_globalData->
jsFunctionVPtr
));
//
First, in the case of a construct, allocate the new object.
if
(opcodeID == op_construct) {
JITStubCall
(
this
, cti_op_construct_JSConstruct).
call
(registerOffset - RegisterFile::CallFrameHeaderSize - argCount);
emitGetVirtualRegister
(callee, regT0);
}
//
Speculatively roll the callframe, assuming argCount will match the arity.
storePtr
(callFrameRegister,
Address
(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) *
static_cast
<
int
>(
sizeof
(Register))));
addPtr
(
Imm32
(registerOffset *
static_cast
<
int
>(
sizeof
(Register))), callFrameRegister);
move
(
Imm32
(argCount), regT1);
move
(regT0, regT2);
m_callStructureStubCompilationInfo[callLinkInfoIndex].
callReturnLocation
=
emitNakedCall
(m_globalData->
jitStubs
.
ctiVirtualCallLink
());
//
Put the return value in dst.
emitPutVirtualRegister
(dst);
sampleCodeBlock
(m_codeBlock);
//
If not, we need an extra case in the if below!
ASSERT
(
OPCODE_LENGTH
(op_call) ==
OPCODE_LENGTH
(op_call_eval));
//
Done! - return back to the hot path.
if
(opcodeID == op_construct)
emitJumpSlowToHot
(
jump
(),
OPCODE_LENGTH
(op_construct));
else
emitJumpSlowToHot
(
jump
(),
OPCODE_LENGTH
(op_call));
//
This handles host functions
callLinkFailNotObject.
link
(
this
);
callLinkFailNotJSFunction.
link
(
this
);
JITStubCall
(
this
, opcodeID == op_construct ? cti_op_construct_NotJSConstruct : cti_op_call_NotJSFunction).
call
();
emitPutVirtualRegister
(dst);
sampleCodeBlock
(m_codeBlock);
}
/*
------------------------------ END: !ENABLE / ENABLE(JIT_OPTIMIZE_CALL) ------------------------------
*/
#
endif
//
!ENABLE(JIT_OPTIMIZE_CALL)
#
endif
//
USE(JSVALUE32_64)
}
//
namespace JSC
#
endif
//
ENABLE(JIT)
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