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backend_code_emitter.qdi
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/*
Основная часть кодогенератора.
*/
/*****************************************************************************/
word ParmFrameSize; /* Размер фрейма стека, освобождаемого при выходе из функции. */
word AllocatedFrameSize; /* Текущий размер фрейма стека, задействованный под локальные переменные. */
bool CodeRequiresSingleRegister(word P);
word Reg_TARGET;
word Reg_ALT_TARGET;
word RegAllocation[5];
void RegAllocate(word Reg)
when RegAllocation[Reg] != 0:
StopInternalCodegen(__FILE__, __LINE__);
inc RegAllocation[Reg];
end
void RegFree(word Reg)
when RegAllocation[Reg] != 1:
StopInternalCodegen(__FILE__, __LINE__);
dec RegAllocation[Reg];
end
/*****************************************************************************/
word ChooseEmptyReg_IgnoreConsts()
when Reg_ALT_TARGET != RegA & RegAllocation[RegA] == 0:
return RegA;
when Reg_ALT_TARGET != RegD & RegAllocation[RegD] == 0:
return RegD;
when Reg_ALT_TARGET != RegC & RegAllocation[RegC] == 0:
return RegC;
when Reg_ALT_TARGET != RegB & RegAllocation[RegB] == 0:
return RegB;
return RegNone;
end
word ChooseEmptyReg()
when Reg_ALT_TARGET != RegA & RegAllocation[RegA] == 0 & !PHO_RegContainsAConst(RegA):
return RegA;
when Reg_ALT_TARGET != RegD & RegAllocation[RegD] == 0 & !PHO_RegContainsAConst(RegD):
return RegD;
when Reg_ALT_TARGET != RegC & RegAllocation[RegC] == 0 & !PHO_RegContainsAConst(RegC):
return RegC;
when Reg_ALT_TARGET != RegB & RegAllocation[RegB] == 0 & !PHO_RegContainsAConst(RegB):
return RegB;
return ChooseEmptyReg_IgnoreConsts();
end
word ChooseEmptyReg2_IgnoreConsts()
when Reg_ALT_TARGET != RegA & RegAllocation[RegA] == 0:
return RegA;
when Reg_ALT_TARGET != RegB & RegAllocation[RegB] == 0:
return RegB;
when Reg_ALT_TARGET != RegD & RegAllocation[RegD] == 0:
return RegD;
when Reg_ALT_TARGET != RegC & RegAllocation[RegC] == 0:
return RegC;
return RegNone;
end
word ChooseEmptyReg2()
when Reg_ALT_TARGET != RegA & RegAllocation[RegA] == 0 & !PHO_RegContainsAConst(RegA):
return RegA;
when Reg_ALT_TARGET != RegB & RegAllocation[RegB] == 0 & !PHO_RegContainsAConst(RegB):
return RegB;
when Reg_ALT_TARGET != RegD & RegAllocation[RegD] == 0 & !PHO_RegContainsAConst(RegD):
return RegD;
when Reg_ALT_TARGET != RegC & RegAllocation[RegC] == 0 & !PHO_RegContainsAConst(RegC):
return RegC;
return ChooseEmptyReg2_IgnoreConsts();
end
word ChooseEmptyReg3()
when Reg_ALT_TARGET != RegB & RegAllocation[RegB] == 0 & !PHO_RegContainsAConst(RegB):
return RegB;
when Reg_ALT_TARGET != RegC & RegAllocation[RegC] == 0 & !PHO_RegContainsAConst(RegC):
return RegC;
when Reg_ALT_TARGET != RegB & RegAllocation[RegB] == 0:
return RegB;
when Reg_ALT_TARGET != RegC & RegAllocation[RegC] == 0:
return RegC;
return RegNone;
end
word ChooseOptimalRegForNode(word P; word RegDefault)
select
case NodeCanBeEncodedAsImm(P):
word Value = Node[P].Value;
if Value == 0 then
return ChooseEmptyReg2();
else
return RegDefault;
end:if
case CodeRequiresSingleRegister(P):
word Reg = ChooseEmptyReg2();
if Reg != RegNone then
return Reg;
else
return RegDefault;
end:if
default:
return RegDefault;
end:select
end
/*****************************************************************************/
word LookupRegForNode(word P)
word Reg = PHO_LookupRegForNode(P);
if Reg != RegNone then
return Reg;
end:if
when !NodeCanBeEncodedAsImm(P):
return RegNone;
word Size = T_SizeOf(Node[P].pType);
when (Size != 4) & (Size != 2) & (Size != 1):
return RegNone;
/* FIXME: проверять только часть регистра при необходимости */
return PHO_FindRegWithConst(Node[P].Value);
end
/*****************************************************************************/
word Code(word P);
word CodeBooleanExpr(word P; LABEL @F; LABEL @T; LABEL @M);
/*****************************************************************************/
struct CODEBLOCK of
word Saved_nLocal;
word Saved_AllocatedFrameSize;
end
void Code_BeginBlock(CODEBLOCK@ CB)
CB.Saved_nLocal = nLocal;
CB.Saved_AllocatedFrameSize = AllocatedFrameSize;
end
void Code_EndBlock(CODEBLOCK@ CB)
nLocal = CB.Saved_nLocal;
AllocatedFrameSize = CB.Saved_AllocatedFrameSize;
end
/*****************************************************************************/
word Code_List(word P)
while P < nNODE do
word pType = Code(P);
when pType == st_noreturn:
return st_noreturn;
P = Node[P].pRight;
end
return st_void;
end
word Code_Block(word P)
CODEBLOCK CB;
Code_BeginBlock(@CB);
word pType = Code_List(P);
Code_EndBlock(@CB);
return pType;
end
/*****************************************************************************/
include "backend_code_emitter_ctrl.qdi";
/*****************************************************************************/
void Emit_SaveReg(word Reg; char @Comment)
char Buff[nBUFF];
Buff[0] = #0;
EmitWithExprComment(@CodePushReg(@Buff, Reg, 4), @Comment);
end
void Emit_RestoreReg(word Reg; char @Comment)
char Buff[nBUFF];
Buff[0] = #0;
EmitWithExprComment(@CodePopReg(@Buff, Reg, 4), @Comment);
end
/*****************************************************************************/
void Code_ADDR(word P1; ValueRef @Ref)
char Buff[nBUFF];
Buff[0] = #0;
if !T_IsPtr(Ref.pType) then
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
end:if
word pTypeDeref = T_DerefPtr(Ref.pType);
word Size = T_SizeOf(pTypeDeref);
word pIndex = P1;
if pIndex < nNODE & NodeIsLiteralWord(pIndex) & Node[pIndex].Value == 0 then
pIndex = nNODE;
end:if
if pIndex < nNODE then
select
case Ref.IX == RegNone:
pass;
case Ref.IX == Reg_ALT_TARGET:
Reg_TARGET = ChooseEmptyReg2();
when Reg_TARGET == RegNone:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
case Reg_ALT_TARGET != RegNone:
if Reg_TARGET != Reg_ALT_TARGET then
Emit_SaveReg(Reg_ALT_TARGET, "saved in Code_ADDR");
end:if
Buff[0] = #0;
Emit(@CodeXchgRegReg(@Buff, Ref.IX, Reg_ALT_TARGET, 4));
Reg_TARGET = Ref.IX;
Ref.IX = Reg_ALT_TARGET;
default:
Reg_ALT_TARGET = Ref.IX;
Reg_TARGET = ChooseEmptyReg2();
when Reg_TARGET == RegNone:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
end:select
Code(pIndex);
Emit_IMUL_Reg_Const(Reg_TARGET, 4, Size);
if Reg_TARGET == Reg_ALT_TARGET then
if Ref.IX != RegNone then
Ref.IX = RegB;
Emit_RestoreReg(Ref.IX, "restored in Code_ADDR");
end:if
end:if
end:if
char @TX = @CodeReg(NULL, Reg_TARGET, 4);
switch Ref.ID of
case iDATA, iPARM, iLOCAL, iREF:
if pIndex < nNODE then
strcpy3(@Buff,"add ",@TX,", ");
else
strcpy3(@Buff,"mov ",@TX,", ");
end:if
Emit(@ValueRef_Code(@Buff, @Ref));
case iREG:
if Ref.IX != RegNone then
if Reg_TARGET != Ref.IX then
char @RX = @CodeReg(NULL, Ref.IX, 4);
if Ref.Offset != 0 then
strcpy3(@Buff,"lea ",@TX,", dword ");
strcat7(@Buff,"[",@TX,"+",@RX,"+",@istr(Ref.Offset),"]");
EmitPhoInvalidate(@Buff);
else
Emit(@strcpy4(@Buff,"add ",@TX,", ",@RX));
end:if
end:if
else
//Reg_TARGET = Ref.IX;
pass;
end:if
default:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
end:switch
if Reg_TARGET == Reg_ALT_TARGET | Reg_ALT_TARGET == RegNone then
Ref.IX = Reg_TARGET;
else
word Reg_TARGET_tmp = Reg_TARGET;
if Ref.IX != RegNone then
when (Reg_ALT_TARGET == RegNone):
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
Reg_TARGET = Reg_ALT_TARGET;
end:if
Ref.IX = Reg_TARGET_tmp;
end:if
Ref.pType = pTypeDeref;
Ref.ID = iREF;
Ref.Offset = 0;
end
/*****************************************************************************/
void Code_INDEX(word P1; ValueRef @Ref)
Ref.pType = T_ArrayDeref(Ref.pType);
word Size = T_SizeOf(Ref.pType);
select
case NodeIsLiteralWord(P1):
word IndexingOffset = Size * Node[P1].Value;
Ref.Offset = Ref.Offset + int(IndexingOffset);
case Ref.IX == RegNone:
Code(P1);
Ref.IX = Reg_TARGET;
Emit_IMUL_Reg_Const(Ref.IX, 4, Size);
when Reg_ALT_TARGET == RegNone:
Reg_ALT_TARGET = Ref.IX;
default:
when Reg_ALT_TARGET != RegNone & Reg_ALT_TARGET != Ref.IX:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
Reg_TARGET = ChooseEmptyReg();
when Reg_TARGET == Reg_ALT_TARGET | Reg_TARGET == RegNone:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
Code(P1);
Emit_IMUL_Reg_Const(Reg_TARGET, 4, Size);
if Reg_TARGET == Reg_ALT_TARGET then
when Reg_TARGET != Ref.IX:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
Reg_TARGET = ChooseEmptyReg();
Emit_RestoreReg(Reg_TARGET, "restored in Code_INDEX");
end:if
Emit_CmdRegReg("add", Ref.IX, 4, Reg_TARGET, 4);
Reg_TARGET = Ref.IX;
end:select
end
/*****************************************************************************/
void Code_LPTR(word P1; ValueRef @Ref)
char Buff [nBUFF];
Buff[0] = #0;
char @TX = @CodeReg(NULL, Reg_TARGET, 4);
if Ref.IX != RegNone then
switch Ref.ID of
case iDATA, iSTRING:
strcpy3(@Buff,"add ",@TX,", ");
Emit(@ValueRef_Code_StaticOffset(@Buff, @Ref));
case iPARM, iLOCAL:
strcpy3(@Buff,"lea ",@TX,", ");
EmitPhoInvalidate(@ValueRef_Code_ForLEA(@Buff, @Ref));
case iREF:
if Reg_TARGET != Ref.IX then
if Ref.Offset != 0 then
strcpy3(@Buff,"lea ",@TX,", ");
EmitPhoInvalidate(@ValueRef_Code_ForLEA(@Buff, @Ref));
else
Emit(@CodeCmdRegReg(@Buff, "mov", Reg_TARGET, 4, Ref.IX, 4));
end
else
when Ref.Offset != 0:
Emit(@strcpy4(@Buff,"add ",@TX,", ",@istr(Ref.Offset)));
end
default:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
end:switch
else
switch Ref.ID of
case iDATA, iSTRING:
strcpy3(@Buff,"mov ",@TX,", ");
Emit(@ValueRef_Code_StaticOffset(@Buff, @Ref));
case iPARM, iLOCAL:
strcpy3(@Buff,"lea ",@TX,", ");
EmitPhoInvalidate(@ValueRef_Code_ForLEA(@Buff, @Ref));
case iREF:
pass;
default:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P1);
end:switch
end:if
Ref.pType = T_PtrTo(Ref.pType);
Ref.ID = iREG;
Ref.IX = Reg_TARGET;
Ref.Offset = 0;
end
/*****************************************************************************/
void Code_CALL(word pPrimary; ValueRef @Ref)
char Buff[nBUFF];
Buff[0] = #0;
if Reg_ALT_TARGET == RegA & Reg_TARGET != RegA then
Emit_SaveReg(RegA, "saved in Code_CALL");
end:if
Reg_TARGET = RegA;
switch Node[pPrimary].ID of
case iCALL:
when Node[pPrimary].pLeft != nNODE:
Code(Node[pPrimary].pLeft);
word pFunc = NodeGetDict(pPrimary);
if Dict[pFunc].Sub==sSYS then
EmitWithPhoMode(
@strcpy3(@Buff,"call [@",@str(Dict[pFunc].Label),"]"),
PHO_Mode_Invalidate
);
else
EmitWithPhoModeAndComment(
@strcpy2(@Buff,"call @",@str(Dict[pFunc].Label)),
PHO_Mode_Invalidate,
@DictGetName(pFunc)
);
end:if
case iCALL2:
when Node[pPrimary].pLeft != nNODE:
Code(Node[pPrimary].pLeft);
Code(Node[pPrimary].pRight);
EmitWithPhoMode("call EAX", PHO_Mode_Invalidate);
default:
StopInternal(__FILE__, __LINE__);
end:switch
Reg_TARGET = RegA;
Ref.pType = Node[pPrimary].pType;
Ref.ID = iREG;
Ref.IX = RegA;
Ref.Offset = 0;
end
/*****************************************************************************/
word CodePrimary(word pPrimary; ValueRef @Ref)
switch Node[pPrimary].ID of
case iDATA, iPARM, iLOCAL, iSTRING:
ValueRef_ExtractDataInfo(@Ref, pPrimary);
case iCALL, iCALL2:
Code_CALL(pPrimary, @Ref);
case iINDEX:
CodePrimary(Node[pPrimary].pLeft, @Ref);
Code_INDEX(Node[pPrimary].pRight, @Ref);
case iLPTR:
CodePrimary(Node[pPrimary].pLeft, @Ref);
Code_LPTR(Node[pPrimary].pRight, @Ref);
case iADDR:
CodePrimary(Node[pPrimary].pLeft, @Ref);
Code_ADDR(Node[pPrimary].pRight, @Ref);
case iFIELD:
CodePrimary(Node[pPrimary].pLeft, @Ref);
ValueRef_Apply_FIELD(@Ref, pPrimary);
default:
word pType = Code(pPrimary);
Ref.ID = iREG;
Ref.RO = 0;
Ref.pType = pType;
Ref.Offset = 0;
Ref.IX = Reg_TARGET;
end
return Ref.pType;
end
/*****************************************************************************/
word Code_LOAD(word pPrimary; ValueRef @Ref)
char Buff[nBUFF];
Buff[0] = #0;
if Ref.ID==iREG then
//when Ref.IX != Reg_TARGET:
// StopAtNodeInternalCodegen(__FILE__, __LINE__, pPrimary);
return Ref.pType;
end:if
word Size = T_SizeOf(Ref.pType);
select
case IsNativeOperandSize(Size):
strcpy3(@Buff, "mov ", @CodeReg(NULL, Reg_TARGET, Size), ", ");
ValueRef_Code(@Buff, @Ref);
default:
strcpy3(@Buff, "lea ", @CodeReg(NULL, Reg_TARGET, 4), ", ");
ValueRef_Code_ForLEA(@Buff, @Ref);
end:select
Emit(@Buff);
PHO_LinkNode(Reg_TARGET, pPrimary);
return Ref.pType;
end
/*****************************************************************************/
void Code_STORE(ValueRef @Ref; word pLinkStore, pLinkLoad)
char Buff[nBUFF];
Buff[0] = #0;
word Size = T_SizeOf(Ref.pType);
select
case IsNativeOperandSize(Size):
strcpy(@Buff,"mov ");
ValueRef_Code(@Buff, @Ref);
/*when Ref.IX != Reg_TARGET & Ref.IX != RegNone:
StopAtNodeInternalCodegen(__FILE__, __LINE__, pPrimary);*/
select
case Reg_TARGET != Reg_ALT_TARGET:
Emit(@strcat2(@Buff,", ",@CodeReg(NULL, Reg_ALT_TARGET, Size)));
PHO_LinkNode(Reg_ALT_TARGET, pLinkLoad);
PHO_LinkNode_Store(Reg_ALT_TARGET, pLinkStore);
case Ref.IX==RegA:
Emit_RestoreReg(RegB, "restored in Code_STORE");
Emit(@strcat2(@Buff,", ",@CodeReg(NULL, RegB, Size)));
PHO_LinkNode(RegB, pLinkLoad);
PHO_LinkNode_Store(RegB, pLinkStore);
case Ref.IX==RegB:
Emit_RestoreReg(RegA, "restored in Code_STORE");
Emit(@strcat2(@Buff,", ",@CodeReg(NULL, RegA, Size)));
PHO_LinkNode(RegA, pLinkLoad);
PHO_LinkNode_Store(RegA, pLinkStore);
end:select
default:
strcpy(@Buff,"lea EDI, ");
ValueRef_Code_ForLEA(@Buff, @Ref);
Emit(@Buff);
if Reg_TARGET != Reg_ALT_TARGET then
Emit(@strcpy2(@Buff,"mov ESI, ",@CodeReg(NULL, Reg_ALT_TARGET, 4)));
else
EmitWithExprComment("pop ESI", "restored in Code_STORE");
end:if
Emit("cld");
Emit(@strcpy2(@Buff,"mov ECX, ",@str(Size)));
Emit("rep movsb");
PHO_RegConnectConst(RegC, 0);
end:select
end
/*****************************************************************************/
word Code_CAST(char @Buff; word P; word pTypeTo; word pTypeFrom; word Reg; word @Complexity)
Complexity = 0;
select
case pTypeFrom == nDICT:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P);
case pTypeFrom == st_void:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P);
case pTypeTo == st_void:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P);
case T_Equal(pTypeTo, pTypeFrom):
pass;
case (T_IsInteger(pTypeTo) | pTypeTo == st_char)&
(T_IsInteger(pTypeFrom) | pTypeFrom == st_char):
word SizeTo = T_SizeOf(pTypeTo);
word SizeFrom = T_SizeOf(pTypeFrom);
/*
unsigned(16) into unsigned(32) zero-extension
unsigned(16) into signed(32) zero-extension
signed(16) into signed(32) sign-extension
signed(16) into unsigned(32) sign-extension
*/
if SizeTo > SizeFrom then
if T_IsSigned(pTypeFrom) then
Complexity = 1;
if @Buff != NULL then
Emit(@CodeCmdRegReg(@Buff, "movsx", Reg, SizeTo, Reg, SizeFrom));
end:if
else
Complexity = 1;
if @Buff != NULL then
Emit(@CodeCmdRegReg(@Buff, "movzx", Reg, SizeTo, Reg, SizeFrom));
end:if
end:if
end:if
case T_IsPtr(pTypeTo) & T_IsPtr(pTypeFrom):
pass;
case (pTypeTo == st_intptr | pTypeTo == st_uintptr) & T_IsPtr(pTypeFrom):
pass;
default:
StopAtNodeInternalCodegen(__FILE__, __LINE__, P);
end
return pTypeTo;
end
/*****************************************************************************/
/*
Для оптимизации генерируемого кода, нам требуется уметь отвечать на два вопроса:
* Может ли ветка кода быть закодирована как MemRef (и формирование данного MemRef).
* Может ли ветка кода быть закодирована с использованием только одного регистра.
Для веток Primary алгоритм ответа на эти вопросы содержит по большей части
идентичный код и отличается только в деталях.
Эта вспомогательная функция проводит анализ веток Primary для одного из указанных
вариантов анализа в зависимости от значения параметра Query.
*/
define Query_MemoryOperand 0
define Query_SingleRegOperand 1
struct OperandQuery of
word Query;
ValueRef Ref;
end
bool QueryOperandStatus(char @Buff; word pPrimary; word @pTypeFinal; word Query);
bool QueryOperandStatus_(word pPrimary; OperandQuery @_Q);
bool QueryOperandStatus_CAST(word pPrimary; OperandQuery @_Q)
word pTypeFrom = Node[Node[pPrimary].pLeft].pType;
word pTypeTo = Node[pPrimary].pType;
when !QueryOperandStatus_(Node[pPrimary].pLeft, @_Q):
return false;
word Complexity = 0;
DisableEmit();
pTypeTo = Code_CAST(NULL, pPrimary, pTypeTo, pTypeFrom, RegA, @Complexity);
EnableEmit();
if Complexity == 0 then
ValueRef @Ref = @_Q.Ref;
Ref.pType = pTypeTo;
return true;
else
return false;
end:if
end
bool QueryOperandStatus_(word pPrimary; OperandQuery @_Q)
ValueRef @Ref = @_Q.Ref;
word Query = _Q.Query;
switch Node[pPrimary].ID of
case iDATA, iPARM, iLOCAL, iSTRING:
ValueRef_ExtractDataInfo(@Ref, pPrimary);
case iLPTR:
if Query == Query_SingleRegOperand then
return QueryOperandStatus_(Node[pPrimary].pLeft, @_Q);
else
return false;
end:if
case iINDEX:
bool RecursiveResult = QueryOperandStatus_(Node[pPrimary].pLeft, @_Q);
when !RecursiveResult:
return RecursiveResult;
Ref.pType = T_ArrayDeref(Ref.pType);
word Size = SizeOfType(Ref.pType);
word pIndex = Node[pPrimary].pRight;
if NodeIsLiteralWord(pIndex) then
word IndexingOffset = Size * Node[pIndex].Value;
Ref.Offset = Ref.Offset + int(IndexingOffset);
else
if Query != Query_SingleRegOperand then
return false;
end:if
when Ref.IX != RegNone:
return false;
when !CodeRequiresSingleRegister_(pIndex):
return false;
Ref.IX = RegA;
end:if
case iADDR:
if Query != Query_SingleRegOperand then
return false;
end:if
bool RecursiveResult = QueryOperandStatus_(Node[pPrimary].pLeft, @_Q);
when !RecursiveResult:
return RecursiveResult;
Ref.pType = T_DerefPtr(Ref.pType);
word Size = SizeOfType(Ref.pType);
word pIndex = Node[pPrimary].pRight;
if pIndex < nNODE & NodeIsLiteralWord(pIndex) & Node[pIndex].Value == 0 then
pIndex = nNODE;
end:if
if pIndex < nNODE then
when Ref.IX != RegNone:
return false;
when !CodeRequiresSingleRegister_(pIndex):
return false;
end:if
Ref.Offset = 0;
Ref.IX = RegA;
case iFIELD:
bool RecursiveResult = QueryOperandStatus_(Node[pPrimary].pLeft, @_Q);
when !RecursiveResult:
return RecursiveResult;
ValueRef_Apply_FIELD(@Ref, pPrimary);
case iCAST, iREINTERPRET_CAST:
return QueryOperandStatus_CAST(pPrimary, @_Q);
default:
return false;
end
return true;
end
bool QueryOperandStatus(char @Buff; word pPrimary; word @pTypeFinal; word Query)
when (Query == Query_SingleRegOperand) & (@pTypeFinal != NULL):
StopAtNodeInternalCodegen(__FILE__, __LINE__, pPrimary);
OperandQuery _Q;
_Q.Query = Query;
bool Result = QueryOperandStatus_(pPrimary, @_Q);
if Result then
switch Query of
case Query_MemoryOperand:
ValueRef @Ref = @_Q.Ref;
word Size = SizeOfType(Ref.pType);
select
case IsNativeOperandSize(Size):
if @Buff != NULL then
Buff[0] = #0;
ValueRef_Code(@Buff, @Ref);
end
when @pTypeFinal != NULL:
pTypeFinal = Ref.pType;
return true;
default:
return false;
end:select
case Query_SingleRegOperand:
pass;
default:
StopAtNodeInternalCodegen(__FILE__, __LINE__, pPrimary);
end:switch
end:if
return Result;
end
/*****************************************************************************/
/*
Если узел pPrimary может быть закодирован как MemRef,
выводит в буфер Buff этот MemRef, а в pTypeFinal записывает тип выражения.
Возввращает true при этом.
Если узел pPrimary не может быть закодирован как MemRef, возвращает false.
*/
bool CodeAsMemoryOperand(char @Buff; word pPrimary; word @pTypeFinal)
return QueryOperandStatus(@Buff, pPrimary, @pTypeFinal, Query_MemoryOperand);
end
bool NodeCanBeEncodedAsMemoryOperand(word pPrimary)
return QueryOperandStatus(NULL, pPrimary, NULL, Query_MemoryOperand);
end
/*****************************************************************************/
bool CodeRequiresSingleRegister_(word P)
when NodeCanBeEncodedAsImm(P):
return true;
word ID = Node[P].ID;
switch ID of
case iADD, iBIT_OR, iBIT_XOR, iBIT_AND:
word pLeft = Node[P].pLeft;
word pRight = Node[P].pRight;
if
(CodeRequiresSingleRegister_(pLeft)) &
(
NodeCanBeEncodedAsImm(pRight) |
NodeCanBeEncodedAsMemoryOperand(pRight)
)
then
return true;
end:if
if
(CodeRequiresSingleRegister_(pRight)) &
(
NodeCanBeEncodedAsImm(pLeft) |
NodeCanBeEncodedAsMemoryOperand(pLeft)
)
then
return true;
end:if
return false;
case iSUB:
word pLeft = Node[P].pLeft;
word pRight = Node[P].pRight;
if
(CodeRequiresSingleRegister_(pLeft)) &
(
NodeCanBeEncodedAsImm(pRight) |
NodeCanBeEncodedAsMemoryOperand(pRight)
)
then
return true;
end:if
return false;
case iMUL:
if T_SizeOf(Node[P].pType) != 4 then
return false;
end:if
word pLeft = Node[P].pLeft;
word pRight = Node[P].pRight;
if
NodeCanBeEncodedAsImm(pRight) &
CodeRequiresSingleRegister_(pLeft)
then
return true;
end:if
if
NodeCanBeEncodedAsImm(pLeft) &
CodeRequiresSingleRegister_(pRight)
then
return true;
end:if
return false;
case iBIT_NOT, iNEG:
return CodeRequiresSingleRegister_(Node[P].pLeft);
case iCAST, iREINTERPRET_CAST:
word pTypeFrom = Node[Node[P].pLeft].pType;
word pTypeTo = Node[P].pType;
when !CodeRequiresSingleRegister_(Node[P].pLeft):
return false;
word Complexity = 0;
pTypeTo = Code_CAST(NULL, P, pTypeTo, pTypeFrom, RegA, @Complexity);
if Complexity < 2 then
return true;
else
return false;
end:if
end:switch
return QueryOperandStatus(NULL, P, NULL, Query_SingleRegOperand);
end
/*****************************************************************************/
bool CodeRequiresSingleRegister(word P)
bool Result;
DisableEmit();
Result = CodeRequiresSingleRegister_(P);
EnableEmit();
return Result;
end
/*****************************************************************************/
/** Checks if the operands can be swapped for no cost, but we should change the operation ID as well.
Returns the ID of swapped operation, if the operation is swappable.
Returns the same ID, if the operation is commutative.
Returns zero otherwise.
*/
word CheckOperationSwappable(word ID)
switch ID of
case iBIT_OR, iBIT_XOR, iBIT_AND, iADD, iMUL, iEQ, iNE:
return ID;
case iLT: return iGT;
case iLE: return iGE;
case iGE: return iLE;
case iGT: return iLT;
end:switch
return 0;
end
/*****************************************************************************/
bool DoesOperationAllowRightMemRef(word ID)
switch ID of
case
iBIT_OR,
iBIT_XOR,
iBIT_AND,
iADD,
iSUB,
iMUL,
iDIV,
iMOD,
iLT,
iLE,
iEQ,
iNE,
iGE,
iGT:
return true;
default:
return false;
end:switch
end
bool DoesOperationAllowRightImm(word ID)
switch ID of
case
iBIT_OR,
iBIT_XOR,
iBIT_AND,
iADD,
iSUB,
iLT,
iLE,
iEQ,
iNE,
iGE,
iGT:
return true;
default:
return false;
end:switch
end
bool DoesOperationAllowRightRegD(word ID)
switch ID of
case
iDIV,
iMOD:
return false;
default:
return true;
end:switch
end
bool DoesOperationAllowRightReg(word ID; word RegRight)
switch ID of
case
iDIV,
iMOD:
if RegRight == RegD then
return false;
else
return true;
end
default:
return true;
end:switch
end
/** A heuristic to determine whether it might be advantageous to change the order in which operands are evaluated.
Returns NULL, if the operand evaluation should not be reordered.
Returns a string describing the reason of reordering (for debugging purposes),
if the operand evaluation should be reordered.
*/
char @CheckOperandReordering(word pLeft; word pRight)
when !ReorderOperands:
return NULL;
when NodeCanBeEncodedAsImm(pRight):
return NULL;
when CodeRequiresSingleRegister(pRight):
return NULL;
when NodeCanBeEncodedAsImm(pLeft):
return "Imm on the left";
when CodeRequiresSingleRegister(pLeft):
return "Single-register operand on the left";
return NULL;
end
/*****************************************************************************/
word TryDropCastBeforeCmp(word P)
word ID = Node[P].ID;
word pLeft = Node[P].pLeft;
word pRight = Node[P].pRight;
when ID < iLT | iGT < ID:
return nNODE;
when Node[pRight].Value > 255: /* TODO: this case should be optimized out on the semantic analysis phase */
return nNODE;
when Node[pLeft].ID != iCAST & Node[pLeft].ID != iREINTERPRET_CAST:
return nNODE;
word pTypeFrom = Node[Node[pLeft].pLeft].pType;
word pTypeTo = Node[pLeft].pType;
when pTypeFrom != st_char & pTypeFrom != st_byte:
return nNODE;
when pTypeTo != st_word:
return nNODE;
return Node[pLeft].pLeft;
end
/*****************************************************************************/
word TryCodeFastMult(char @Buff; word P)
when Node[P].ID != iMUL: