/* expr.c
- *
- * Ullrich von Bassewitz, 21.06.1998
- */
+**
+** Ullrich von Bassewitz, 21.06.1998
+*/
/* Call the expression function */
(*Func) (Expr);
- /* Do some checks if code generation is still constistent */
+ /* Do some checks to see if code generation is still consistent */
if (StackPtr != OldSP) {
if (Debug) {
Error ("Code generation messed up: "
void MarkedExprWithCheck (void (*Func) (ExprDesc*), ExprDesc* Expr)
/* Call an expression function with checks and record start and end of the
- * generated code.
- */
+** generated code.
+*/
{
CodeMark Start, End;
GetCodePos (&Start);
/* In an expression with two ints, return the type of the result */
{
/* Rules for integer types:
- * - If one of the values is a long, the result is long.
- * - If one of the values is unsigned, the result is also unsigned.
- * - Otherwise the result is an int.
- */
+ ** - If one of the values is a long, the result is long.
+ ** - If one of the values is unsigned, the result is also unsigned.
+ ** - Otherwise the result is an int.
+ */
if (IsTypeLong (lhst) || IsTypeLong (rhst)) {
if (IsSignUnsigned (lhst) || IsSignUnsigned (rhst)) {
return type_ulong;
static unsigned typeadjust (ExprDesc* lhs, ExprDesc* rhs, int NoPush)
/* Adjust the two values for a binary operation. lhs is expected on stack or
- * to be constant, rhs is expected to be in the primary register or constant.
- * The function will put the type of the result into lhs and return the
- * code generator flags for the operation.
- * If NoPush is given, it is assumed that the operation does not expect the lhs
- * to be on stack, and that lhs is in a register instead.
- * Beware: The function does only accept int types.
- */
+** to be constant, rhs is expected to be in the primary register or constant.
+** The function will put the type of the result into lhs and return the
+** code generator flags for the operation.
+** If NoPush is given, it is assumed that the operation does not expect the lhs
+** to be on stack, and that lhs is in a register instead.
+** Beware: The function does only accept int types.
+*/
{
unsigned ltype, rtype;
unsigned flags;
static int TypeSpecAhead (void)
/* Return true if some sort of type is waiting (helper for cast and sizeof()
- * in hie10).
- */
+** in hie10).
+*/
{
SymEntry* Entry;
/* There's a type waiting if:
- *
- * We have an opening paren, and
- * a. the next token is a type, or
- * b. the next token is a type qualifier, or
- * c. the next token is a typedef'd type
- */
+ **
+ ** We have an opening paren, and
+ ** a. the next token is a type, or
+ ** b. the next token is a type qualifier, or
+ ** c. the next token is a typedef'd type
+ */
return CurTok.Tok == TOK_LPAREN && (
TokIsType (&NextTok) ||
TokIsTypeQual (&NextTok) ||
void PushAddr (const ExprDesc* Expr)
/* If the expression contains an address that was somehow evaluated,
- * push this address on the stack. This is a helper function for all
- * sorts of implicit or explicit assignment functions where the lvalue
- * must be saved if it's not constant, before evaluating the rhs.
- */
+** push this address on the stack. This is a helper function for all
+** sorts of implicit or explicit assignment functions where the lvalue
+** must be saved if it's not constant, before evaluating the rhs.
+*/
{
/* Get the address on stack if needed */
if (ED_IsLocExpr (Expr)) {
static void WarnConstCompareResult (void)
/* If the result of a comparison is constant, this is suspicious when not in
- * preprocessor mode.
- */
+** preprocessor mode.
+*/
{
if (!Preprocessing && IS_Get (&WarnConstComparison) != 0) {
Warning ("Result of comparison is constant");
static unsigned FunctionParamList (FuncDesc* Func, int IsFastcall)
/* Parse a function parameter list and pass the parameters to the called
- * function. Depending on several criteria this may be done by just pushing
- * each parameter separately, or creating the parameter frame once and then
- * storing into this frame.
- * The function returns the size of the parameters pushed.
- */
+** function. Depending on several criteria this may be done by just pushing
+** each parameter separately, or creating the parameter frame once and then
+** storing into this frame.
+** The function returns the size of the parameters pushed.
+*/
{
ExprDesc Expr;
int Ellipsis = 0; /* Function is variadic */
/* As an optimization, we may allocate the complete parameter frame at
- * once instead of pushing each parameter as it comes. We may do that,
- * if...
- *
- * - optimizations that increase code size are enabled (allocating the
- * stack frame at once gives usually larger code).
- * - we have more than one parameter to push (don't count the last param
- * for __fastcall__ functions).
- *
- * The FrameSize variable will contain a value > 0 if storing into a frame
- * (instead of pushing) is enabled.
- *
- */
+ ** once instead of pushing each parameter as it comes. We may do that,
+ ** if...
+ **
+ ** - optimizations that increase code size are enabled (allocating the
+ ** stack frame at once gives usually larger code).
+ ** - we have more than one parameter to push (don't count the last param
+ ** for __fastcall__ functions).
+ **
+ ** The FrameSize variable will contain a value > 0 if storing into a frame
+ ** (instead of pushing) is enabled.
+ **
+ */
if (IS_Get (&CodeSizeFactor) >= 200) {
/* Calculate the number and size of the parameters */
/* Fetch the pointer to the next argument, check for too many args */
if (ParamCount <= Func->ParamCount) {
/* Beware: If there are parameters with identical names, they
- * cannot go into the same symbol table, which means that in this
- * case of errorneous input, the number of nodes in the symbol
- * table and ParamCount are NOT equal. We have to handle this case
- * below to avoid segmentation violations. Since we know that this
- * problem can only occur if there is more than one parameter,
- * we will just use the last one.
- */
+ ** cannot go into the same symbol table, which means that in this
+ ** case of errorneous input, the number of nodes in the symbol
+ ** table and ParamCount are NOT equal. We have to handle this case
+ ** below to avoid segmentation violations. Since we know that this
+ ** problem can only occur if there is more than one parameter,
+ ** we will just use the last one.
+ */
if (ParamCount == 1) {
/* First argument */
Param = Func->SymTab->SymHead;
Error ("Too many arguments in function call");
}
/* Assume an ellipsis even in case of errors to avoid an error
- * message for each other argument.
- */
+ ** message for each other argument.
+ */
Ellipsis = 1;
}
hie1 (&Expr);
/* If we don't have an argument spec, accept anything, otherwise
- * convert the actual argument to the type needed.
- */
+ ** convert the actual argument to the type needed.
+ */
Flags = CF_NONE;
if (!Ellipsis) {
} else {
/* No prototype available. Convert array to "pointer to first
- * element", and function to "pointer to function".
- */
+ ** element", and function to "pointer to function".
+ */
Expr.Type = PtrConversion (Expr.Type);
}
unsigned ArgSize = sizeofarg (Flags);
if (FrameSize > 0) {
/* We have the space already allocated, store in the frame.
- * Because of invalid type conversions (that have produced an
- * error before), we can end up here with a non aligned stack
- * frame. Since no output will be generated anyway, handle
- * these cases gracefully instead of doing a CHECK.
- */
+ ** Because of invalid type conversions (that have produced an
+ ** error before), we can end up here with a non-aligned stack
+ ** frame. Since no output will be generated anyway, handle
+ ** these cases gracefully instead of doing a CHECK.
+ */
if (FrameSize >= ArgSize) {
FrameSize -= ArgSize;
} else {
}
/* The function returns the size of all parameters pushed onto the stack.
- * However, if there are parameters missing (which is an error and was
- * flagged by the compiler) AND a stack frame was preallocated above,
- * we would loose track of the stackpointer and generate an internal error
- * later. So we correct the value by the parameters that should have been
- * pushed to avoid an internal compiler error. Since an error was
- * generated before, no code will be output anyway.
- */
+ ** However, if there are parameters missing (which is an error and was
+ ** flagged by the compiler) AND a stack frame was preallocated above,
+ ** we would loose track of the stackpointer and generate an internal error
+ ** later. So we correct the value by the parameters that should have been
+ ** pushed to avoid an internal compiler error. Since an error was
+ ** generated before, no code will be output anyway.
+ */
return ParamSize + FrameSize;
}
unsigned ParamSize; /* Number of parameter bytes */
CodeMark Mark;
int PtrOffs = 0; /* Offset of function pointer on stack */
- int IsFastcall = 0; /* True if it's a fast call function */
+ int IsFastcall = 0; /* True if it's a fast-call function */
int PtrOnStack = 0; /* True if a pointer copy is on stack */
/* Skip the left paren */
IsFastcall = IsQualFastcall (Expr->Type + 1) && (Func->ParamCount > 0);
/* Things may be difficult, depending on where the function pointer
- * resides. If the function pointer is an expression of some sort
- * (not a local or global variable), we have to evaluate this
- * expression now and save the result for later. Since calls to
- * function pointers may be nested, we must save it onto the stack.
- * For fastcall functions we do also need to place a copy of the
- * pointer on stack, since we cannot use a/x.
- */
+ ** resides. If the function pointer is an expression of some sort
+ ** (not a local or global variable), we have to evaluate this
+ ** expression now and save the result for later. Since calls to
+ ** function pointers may be nested, we must save it onto the stack.
+ ** For fastcall functions we do also need to place a copy of the
+ ** pointer on stack, since we cannot use a/x.
+ */
PtrOnStack = IsFastcall || !ED_IsConst (Expr);
if (PtrOnStack) {
/* Not a global or local variable, or a fastcall function. Load
- * the pointer into the primary and mark it as an expression.
- */
+ ** the pointer into the primary and mark it as an expression.
+ */
LoadExpr (CF_NONE, Expr);
ED_MakeRValExpr (Expr);
if (IsFuncPtr) {
/* If the function is not a fastcall function, load the pointer to
- * the function into the primary.
- */
+ ** the function into the primary.
+ */
if (!IsFastcall) {
/* Not a fastcall function - we may use the primary */
if (PtrOnStack) {
/* If we have no parameters, the pointer is still in the
- * primary. Remove the code to push it and correct the
- * stack pointer.
- */
+ ** primary. Remove the code to push it and correct the
+ ** stack pointer.
+ */
if (ParamSize == 0) {
RemoveCode (&Mark);
PtrOnStack = 0;
} else {
/* Fastcall function. We cannot use the primary for the function
- * pointer and must therefore use an offset to the stack location.
- * Since fastcall functions may never be variadic, we can use the
- * index register for this purpose.
- */
+ ** pointer and must therefore use an offset to the stack location.
+ ** Since fastcall functions may never be variadic, we can use the
+ ** index register for this purpose.
+ */
g_callind (CF_LOCAL, ParamSize, PtrOffs);
}
}
/* Process parenthesized subexpression by calling the whole parser
- * recursively.
- */
+ ** recursively.
+ */
if (CurTok.Tok == TOK_LPAREN) {
NextToken ();
hie0 (E);
}
/* If we run into an identifier in preprocessing mode, we assume that this
- * is an undefined macro and replace it by a constant value of zero.
- */
+ ** is an undefined macro and replace it by a constant value of zero.
+ */
if (Preprocessing && CurTok.Tok == TOK_IDENT) {
NextToken ();
ED_MakeConstAbsInt (E, 0);
}
/* All others may only be used if the expression evaluation is not called
- * recursively by the preprocessor.
- */
+ ** recursively by the preprocessor.
+ */
if (Preprocessing) {
/* Illegal expression in PP mode */
Error ("Preprocessor expression expected");
E->Name = (unsigned long) Sym->Name;
} else if ((Sym->Flags & SC_AUTO) == SC_AUTO) {
/* Local variable. If this is a parameter for a variadic
- * function, we have to add some address calculations, and the
- * address is not const.
- */
+ ** function, we have to add some address calculations, and the
+ ** address is not const.
+ */
if ((Sym->Flags & SC_PARAM) == SC_PARAM && F_IsVariadic (CurrentFunc)) {
/* Variadic parameter */
g_leavariadic (Sym->V.Offs - F_GetParamSize (CurrentFunc));
}
/* We've made all variables lvalues above. However, this is
- * not always correct: An array is actually the address of its
- * first element, which is a rvalue, and a function is a
- * rvalue, too, because we cannot store anything in a function.
- * So fix the flags depending on the type.
- */
+ ** not always correct: An array is actually the address of its
+ ** first element, which is a rvalue, and a function is a
+ ** rvalue, too, because we cannot store anything in a function.
+ ** So fix the flags depending on the type.
+ */
if (IsTypeArray (E->Type) || IsTypeFunc (E->Type)) {
ED_MakeRVal (E);
}
/* IDENT is either an auto-declared function or an undefined variable. */
if (CurTok.Tok == TOK_LPAREN) {
/* C99 doesn't allow calls to undefined functions, so
- * generate an error and otherwise a warning. Declare a
- * function returning int. For that purpose, prepare a
- * function signature for a function having an empty param
- * list and returning int.
- */
+ ** generate an error and otherwise a warning. Declare a
+ ** function returning int. For that purpose, prepare a
+ ** function signature for a function having an empty param
+ ** list and returning int.
+ */
if (IS_Get (&Standard) >= STD_C99) {
Error ("Call to undefined function `%s'", Ident);
} else {
default:
/* Illegal primary. Be sure to skip the token to avoid endless
- * error loops.
- */
+ ** error loops.
+ */
Error ("Expression expected");
NextToken ();
ED_MakeConstAbsInt (E, 1);
tptr1 = Expr->Type;
/* We can apply a special treatment for arrays that have a const base
- * address. This is true for most arrays and will produce a lot better
- * code. Check if this is a const base address.
- */
+ ** address. This is true for most arrays and will produce a lot better
+ ** code. Check if this is a const base address.
+ */
ConstBaseAddr = ED_IsRVal (Expr) &&
(ED_IsLocConst (Expr) || ED_IsLocStack (Expr));
LoadExpr (CF_NONE, Expr);
/* Get the array pointer on stack. Do not push more than 16
- * bit, even if this value is greater, since we cannot handle
- * other than 16bit stuff when doing indexing.
- */
+ ** bit, even if this value is greater, since we cannot handle
+ ** other than 16bit stuff when doing indexing.
+ */
GetCodePos (&Mark2);
g_push (CF_PTR, 0);
}
MarkedExprWithCheck (hie0, &Subscript);
/* Check the types of array and subscript. We can either have a
- * pointer/array to the left, in which case the subscript must be of an
- * integer type, or we have an integer to the left, in which case the
- * subscript must be a pointer/array.
- * Since we do the necessary checking here, we can rely later on the
- * correct types.
- */
+ ** pointer/array to the left, in which case the subscript must be of an
+ ** integer type, or we have an integer to the left, in which case the
+ ** subscript must be a pointer/array.
+ ** Since we do the necessary checking here, we can rely later on the
+ ** correct types.
+ */
Qualifiers = T_QUAL_NONE;
if (IsClassPtr (Expr->Type)) {
if (!IsClassInt (Subscript.Type)) {
if (!IsClassPtr (Subscript.Type)) {
Error ("Subscripted value is neither array nor pointer");
/* To avoid compiler errors, make the subscript a char[] at
- * address 0.
- */
+ ** address 0.
+ */
ED_MakeConstAbs (&Subscript, 0, GetCharArrayType (1));
} else if (IsTypeArray (Subscript.Type)) {
Qualifiers = GetQualifier (Subscript.Type);
} else {
Error ("Cannot subscript");
/* To avoid compiler errors, fake both the array and the subscript, so
- * we can just proceed.
- */
+ ** we can just proceed.
+ */
ED_MakeConstAbs (Expr, 0, GetCharArrayType (1));
ED_MakeConstAbsInt (&Subscript, 0);
ElementType = Indirect (Expr->Type);
}
/* The element type has the combined qualifiers from itself and the array,
- * it is a member of (if any).
- */
+ ** it is a member of (if any).
+ */
if (GetQualifier (ElementType) != (GetQualifier (ElementType) | Qualifiers)) {
ElementType = TypeDup (ElementType);
ElementType->C |= Qualifiers;
if (ED_IsConstAbs (&Subscript) && ED_CodeRangeIsEmpty (&Subscript)) {
/* The array subscript is a numeric constant. If we had pushed the
- * array base address onto the stack before, we can remove this value,
- * since we can generate expression+offset.
- */
+ ** array base address onto the stack before, we can remove this value,
+ ** since we can generate expression+offset.
+ */
if (!ConstBaseAddr) {
RemoveCode (&Mark2);
} else {
if (IsClassPtr (Expr->Type)) {
/* Lhs is pointer/array. Scale the subscript value according to
- * the element size.
- */
+ ** the element size.
+ */
Subscript.IVal *= CheckedSizeOf (ElementType);
/* Remove the address load code */
RemoveCode (&Mark1);
/* In case of an array, we can adjust the offset of the expression
- * already in Expr. If the base address was a constant, we can even
- * remove the code that loaded the address into the primary.
- */
+ ** already in Expr. If the base address was a constant, we can even
+ ** remove the code that loaded the address into the primary.
+ */
if (IsTypeArray (Expr->Type)) {
/* Adjust the offset */
} else {
/* It's a pointer, so we do have to load it into the primary
- * first (if it's not already there).
- */
+ ** first (if it's not already there).
+ */
if (ConstBaseAddr || ED_IsLVal (Expr)) {
LoadExpr (CF_NONE, Expr);
ED_MakeRValExpr (Expr);
g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
/* Add the subscript. Since arrays are indexed by integers,
- * we will ignore the true type of the subscript here and
- * use always an int. #### Use offset but beware of LoadExpr!
- */
+ ** we will ignore the true type of the subscript here and
+ ** use always an int. #### Use offset but beware of LoadExpr!
+ */
g_inc (CF_INT | CF_CONST, Subscript.IVal);
}
if (IsClassPtr (Expr->Type)) {
/* Indexing is based on unsigneds, so we will just use the integer
- * portion of the index (which is in (e)ax, so there's no further
- * action required).
- */
+ ** portion of the index (which is in (e)ax, so there's no further
+ ** action required).
+ */
g_scale (CF_INT, CheckedSizeOf (ElementType));
} else {
/* Get the int value on top. If we come here, we're sure, both
- * values are 16 bit (the first one was truncated if necessary
- * and the second one is a pointer). Note: If ConstBaseAddr is
- * true, we don't have a value on stack, so to "swap" both, just
- * push the subscript.
- */
+ ** values are 16 bit (the first one was truncated if necessary
+ ** and the second one is a pointer). Note: If ConstBaseAddr is
+ ** true, we don't have a value on stack, so to "swap" both, just
+ ** push the subscript.
+ */
if (ConstBaseAddr) {
g_push (CF_INT, 0);
LoadExpr (CF_NONE, Expr);
}
/* The offset is now in the primary register. It we didn't have a
- * constant base address for the lhs, the lhs address is already
- * on stack, and we must add the offset. If the base address was
- * constant, we call special functions to add the address to the
- * offset value.
- */
+ ** constant base address for the lhs, the lhs address is already
+ ** on stack, and we must add the offset. If the base address was
+ ** constant, we call special functions to add the address to the
+ ** offset value.
+ */
if (!ConstBaseAddr) {
/* The array base address is on stack and the subscript is in the
- * primary. Add both.
- */
+ ** primary. Add both.
+ */
g_add (CF_INT, 0);
} else {
/* The subscript is in the primary, and the array base address is
- * in Expr. If the subscript has itself a constant address, it is
- * often a better idea to reverse again the order of the
- * evaluation. This will generate better code if the subscript is
- * a byte sized variable. But beware: This is only possible if the
- * subscript was not scaled, that is, if this was a byte array
- * or pointer.
- */
+ ** in Expr. If the subscript has itself a constant address, it is
+ ** often a better idea to reverse again the order of the
+ ** evaluation. This will generate better code if the subscript is
+ ** a byte sized variable. But beware: This is only possible if the
+ ** subscript was not scaled, that is, if this was a byte array
+ ** or pointer.
+ */
if ((ED_IsLocConst (&Subscript) || ED_IsLocStack (&Subscript)) &&
CheckedSizeOf (ElementType) == SIZEOF_CHAR) {
Expr->Type = ElementType;
/* An array element is actually a variable. So the rules for variables
- * with respect to the reference type apply: If it's an array, it is
- * a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
- * but an array cannot contain functions).
- */
+ ** with respect to the reference type apply: If it's an array, it is
+ ** a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
+ ** but an array cannot contain functions).
+ */
if (IsTypeArray (Expr->Type)) {
ED_MakeRVal (Expr);
} else {
}
/* If we have a struct pointer that is an lvalue and not already in the
- * primary, load it now.
- */
+ ** primary, load it now.
+ */
if (ED_IsLVal (Expr) && IsTypePtr (Expr->Type)) {
/* Load into the primary */
}
/* A struct is usually an lvalue. If not, it is a struct in the primary
- * register.
- */
+ ** register.
+ */
if (ED_IsRVal (Expr) && ED_IsLocExpr (Expr) && !IsTypePtr (Expr->Type)) {
unsigned Flags = 0;
}
/* Generate a shift to get the field in the proper position in the
- * primary. For bit fields, mask the value.
- */
+ ** primary. For bit fields, mask the value.
+ */
BitOffs = Field->V.Offs * CHAR_BITS;
if (SymIsBitField (Field)) {
BitOffs += Field->V.B.BitOffs;
g_asr (Flags, BitOffs);
/* Mask the value. This is unnecessary if the shift executed above
- * moved only zeroes into the value.
- */
+ ** moved only zeroes into the value.
+ */
if (BitOffs + Field->V.B.BitWidth != Size * CHAR_BITS) {
g_and (CF_INT | CF_UNSIGNED | CF_CONST,
(0x0001U << Field->V.B.BitWidth) - 1U);
Expr->Type = FinalType;
/* An struct member is actually a variable. So the rules for variables
- * with respect to the reference type apply: If it's an array, it is
- * a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
- * but a struct field cannot be a function).
- */
+ ** with respect to the reference type apply: If it's an array, it is
+ ** a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
+ ** but a struct field cannot be a function).
+ */
if (IsTypeArray (Expr->Type)) {
ED_MakeRVal (Expr);
} else {
/* Not a function */
Error ("Illegal function call");
/* Force the type to be a implicitly defined function, one
- * returning an int and taking any number of arguments.
- * Since we don't have a name, invent one.
- */
+ ** returning an int and taking any number of arguments.
+ ** Since we don't have a name, invent one.
+ */
ED_MakeConstAbs (Expr, 0, GetImplicitFuncType ());
Expr->Name = (long) IllegalFunc;
}
void Store (ExprDesc* Expr, const Type* StoreType)
/* Store the primary register into the location denoted by Expr. If StoreType
- * is given, use this type when storing instead of Expr->Type. If StoreType
- * is NULL, use Expr->Type instead.
- */
+** is given, use this type when storing instead of Expr->Type. If StoreType
+** is NULL, use Expr->Type instead.
+*/
{
unsigned Flags;
ExprWithCheck (hie10, Expr);
if (ED_IsLVal (Expr) || !(ED_IsLocConst (Expr) || ED_IsLocStack (Expr))) {
/* Not a const, load it into the primary and make it a
- * calculated value.
- */
+ ** calculated value.
+ */
LoadExpr (CF_NONE, Expr);
ED_MakeRValExpr (Expr);
}
/* If the expression is already a pointer to function, the
- * additional dereferencing operator must be ignored. A function
- * itself is represented as "pointer to function", so any number
- * of dereference operators is legal, since the result will
- * always be converted to "pointer to function".
- */
+ ** additional dereferencing operator must be ignored. A function
+ ** itself is represented as "pointer to function", so any number
+ ** of dereference operators is legal, since the result will
+ ** always be converted to "pointer to function".
+ */
if (IsTypeFuncPtr (Expr->Type) || IsTypeFunc (Expr->Type)) {
/* Expression not storable */
ED_MakeRVal (Expr);
NextToken ();
ExprWithCheck (hie10, Expr);
/* The & operator may be applied to any lvalue, and it may be
- * applied to functions, even if they're no lvalues.
- */
+ ** applied to functions, even if they're no lvalues.
+ */
if (ED_IsRVal (Expr) && !IsTypeFunc (Expr->Type) && !IsTypeArray (Expr->Type)) {
Error ("Illegal address");
} else {
GetCodePos (&Mark);
hie10 (Expr);
/* If the expression is a literal string, release it, so it
- * won't be output as data if not used elsewhere.
- */
+ ** won't be output as data if not used elsewhere.
+ */
if (ED_IsLocLiteral (Expr)) {
ReleaseLiteral (Expr->LVal);
}
/* Constant value */
GetCodePos (&Mark2);
/* If the operator is commutative, don't push the left side, if
- * it's a constant, since we will exchange both operands.
- */
+ ** it's a constant, since we will exchange both operands.
+ */
if ((Gen->Flags & GEN_COMM) == 0) {
g_push (ltype | CF_CONST, Expr->IVal);
}
} else if (lconst && (Gen->Flags & GEN_COMM) && !rconst) {
/* The left side is constant, the right side is not, and the
- * operator allows swapping the operands. We haven't pushed the
- * left side onto the stack in this case, and will reverse the
- * operation because this allows for better code.
- */
+ ** operator allows swapping the operands. We haven't pushed the
+ ** left side onto the stack in this case, and will reverse the
+ ** operation because this allows for better code.
+ */
unsigned rtype = ltype | CF_CONST;
ltype = TypeOf (Expr2.Type); /* Expr2 is now left */
type = CF_CONST;
} else {
/* If the right hand side is constant, and the generator function
- * expects the lhs in the primary, remove the push of the primary
- * now.
- */
+ ** expects the lhs in the primary, remove the push of the primary
+ ** now.
+ */
unsigned rtype = TypeOf (Expr2.Type);
type = 0;
if (rconst) {
} else if (IsClassPtr (Expr->Type)) {
if (IsClassPtr (Expr2.Type)) {
/* Both pointers are allowed in comparison if they point to
- * the same type, or if one of them is a void pointer.
- */
+ ** the same type, or if one of them is a void pointer.
+ */
Type* left = Indirect (Expr->Type);
Type* right = Indirect (Expr2.Type);
if (TypeCmp (left, right) < TC_EQUAL && left->C != T_VOID && right->C != T_VOID) {
if (ED_IsConstAbs (Expr) && rconst) {
/* If the result is constant, this is suspicious when not in
- * preprocessor mode.
- */
+ ** preprocessor mode.
+ */
WarnConstCompareResult ();
/* Both operands are constant, remove the generated code */
int RightSigned = IsSignSigned (Expr2.Type);
/* If the right hand side is constant, and the generator function
- * expects the lhs in the primary, remove the push of the primary
- * now.
- */
+ ** expects the lhs in the primary, remove the push of the primary
+ ** now.
+ */
unsigned flags = 0;
if (rconst) {
flags |= CF_CONST;
if (IsTypeChar (Expr->Type) && rconst) {
/* Left side is unsigned char, right side is constant.
- * Determine the minimum and maximum values
- */
+ ** Determine the minimum and maximum values
+ */
int LeftMin, LeftMax;
if (LeftSigned) {
LeftMin = -128;
LeftMax = 255;
}
/* An integer value is always represented as a signed in the
- * ExprDesc structure. This may lead to false results below,
- * if it is actually unsigned, but interpreted as signed
- * because of the representation. Fortunately, in this case,
- * the actual value doesn't matter, since it's always greater
- * than what can be represented in a char. So correct the
- * value accordingly.
- */
+ ** ExprDesc structure. This may lead to false results below,
+ ** if it is actually unsigned, but interpreted as signed
+ ** because of the representation. Fortunately, in this case,
+ ** the actual value doesn't matter, since it's always greater
+ ** than what can be represented in a char. So correct the
+ ** value accordingly.
+ */
if (!RightSigned && Expr2.IVal < 0) {
/* Correct the value so it is an unsigned. It will then
- * anyway match one of the cases below.
- */
+ ** anyway match one of the cases below.
+ */
Expr2.IVal = LeftMax + 1;
}
/* Comparing a char against a constant may have a constant
- * result. Please note: It is not possible to remove the code
- * for the compare alltogether, because it may have side
- * effects.
- */
+ ** result. Please note: It is not possible to remove the code
+ ** for the compare alltogether, because it may have side
+ ** effects.
+ */
switch (Tok) {
case TOK_EQ:
}
/* If the result is not already constant (as evaluated in the
- * switch above), we can execute the operation as a char op,
- * since the right side constant is in a valid range.
- */
+ ** switch above), we can execute the operation as a char op,
+ ** since the right side constant is in a valid range.
+ */
flags |= (CF_CHAR | CF_FORCECHAR);
if (!LeftSigned) {
flags |= CF_UNSIGNED;
GetSignedness (Expr->Type) == GetSignedness (Expr2.Type)) {
/* Both are chars with the same signedness. We can encode the
- * operation as a char operation.
- */
+ ** operation as a char operation.
+ */
flags |= CF_CHAR;
if (rconst) {
flags |= CF_FORCECHAR;
}
/* If the left side is an unsigned and the right is a constant,
- * we may be able to change the compares to something more
- * effective.
- */
+ ** we may be able to change the compares to something more
+ ** effective.
+ */
if (!LeftSigned && rconst) {
switch (Tok) {
case TOK_LT:
if (Expr2.IVal == 1) {
/* An unsigned compare to one means that the value
- * must be zero.
- */
+ ** must be zero.
+ */
GenFunc = g_eq;
Expr2.IVal = 0;
}
case TOK_LE:
if (Expr2.IVal == 0) {
/* An unsigned compare to zero means that the value
- * must be zero.
- */
+ ** must be zero.
+ */
GenFunc = g_eq;
}
break;
case TOK_GE:
if (Expr2.IVal == 1) {
/* An unsigned compare to one means that the value
- * must not be zero.
- */
+ ** must not be zero.
+ */
GenFunc = g_ne;
Expr2.IVal = 0;
}
case TOK_GT:
if (Expr2.IVal == 0) {
/* An unsigned compare to zero means that the value
- * must not be zero.
- */
+ ** must not be zero.
+ */
GenFunc = g_ne;
}
break;
static void parseadd (ExprDesc* Expr)
/* Parse an expression with the binary plus operator. Expr contains the
- * unprocessed left hand side of the expression and will contain the
- * result of the expression on return.
- */
+** unprocessed left hand side of the expression and will contain the
+** result of the expression on return.
+*/
{
ExprDesc Expr2;
unsigned flags; /* Operation flags */
} else {
/* lhs is a constant and rhs is not constant. Load rhs into
- * the primary.
- */
+ ** the primary.
+ */
LoadExpr (CF_NONE, &Expr2);
/* Beware: The check above (for lhs) lets not only pass numeric
- * constants, but also constant addresses (labels), maybe even
- * with an offset. We have to check for that here.
- */
+ ** constants, but also constant addresses (labels), maybe even
+ ** with an offset. We have to check for that here.
+ */
/* First, get the rhs type. */
rhst = Expr2.Type;
Expr->Type = Expr2.Type;
/* Since we do already have rhs in the primary, if lhs is
- * not a numeric constant, and the scale factor is not one
- * (no scaling), we must take the long way over the stack.
- */
+ ** not a numeric constant, and the scale factor is not one
+ ** (no scaling), we must take the long way over the stack.
+ */
if (ED_IsLocAbs (Expr)) {
/* Numeric constant, scale lhs */
Expr->IVal *= ScaleFactor;
Expr->Type = Expr2.Type;
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
/* Integer addition. Note: Result is never constant.
- * Problem here is that typeadjust does not know if the
- * variable is an rvalue or lvalue, so if both operands
- * are dereferenced constant numeric addresses, typeadjust
- * thinks the operation works on constants. Removing
- * CF_CONST here means handling the symptoms, however, the
- * whole parser is such a mess that I fear to break anything
- * when trying to apply another solution.
- */
+ ** Problem here is that typeadjust does not know if the
+ ** variable is an rvalue or lvalue, so if both operands
+ ** are dereferenced constant numeric addresses, typeadjust
+ ** thinks the operation works on constants. Removing
+ ** CF_CONST here means handling the symptoms, however, the
+ ** whole parser is such a mess that I fear to break anything
+ ** when trying to apply another solution.
+ */
flags = typeadjust (Expr, &Expr2, 0) & ~CF_CONST;
} else {
/* OOPS */
static void parsesub (ExprDesc* Expr)
/* Parse an expression with the binary minus operator. Expr contains the
- * unprocessed left hand side of the expression and will contain the
- * result of the expression on return.
- */
+** unprocessed left hand side of the expression and will contain the
+** result of the expression on return.
+*/
{
ExprDesc Expr2;
unsigned flags; /* Operation flags */
} else {
/* Left hand side is not constant, right hand side is.
- * Remove pushed value from stack.
- */
+ ** Remove pushed value from stack.
+ */
RemoveCode (&Mark2);
if (IsClassPtr (lhst) && IsClassInt (rhst)) {
Expr->Type = type_int;
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
/* Integer subtraction. If the left hand side descriptor says that
- * the lhs is const, we have to remove this mark, since this is no
- * longer true, lhs is on stack instead.
- */
+ ** the lhs is const, we have to remove this mark, since this is no
+ ** longer true, lhs is on stack instead.
+ */
if (ED_IsLocAbs (Expr)) {
ED_MakeRValExpr (Expr);
}
static void hieAndPP (ExprDesc* Expr)
/* Process "exp && exp" in preprocessor mode (that is, when the parser is
- * called recursively from the preprocessor.
- */
+** called recursively from the preprocessor.
+*/
{
ExprDesc Expr2;
static void hieOrPP (ExprDesc *Expr)
/* Process "exp || exp" in preprocessor mode (that is, when the parser is
- * called recursively from the preprocessor.
- */
+** called recursively from the preprocessor.
+*/
{
ExprDesc Expr2;
LoadExpr (CF_FORCECHAR, Expr);
/* For each expression jump to TrueLab if true. Beware: If we
- * had && operators, the jump is already in place!
- */
+ ** had && operators, the jump is already in place!
+ */
if (!BoolOp) {
g_truejump (CF_NONE, TrueLab);
}
g_falsejump (CF_NONE, FalseLab);
/* Parse second expression. Remember for later if it is a NULL pointer
- * expression, then load it into the primary.
- */
+ ** expression, then load it into the primary.
+ */
ExprWithCheck (hie1, &Expr2);
Expr2IsNULL = ED_IsNullPtr (&Expr2);
if (!IsTypeVoid (Expr2.Type)) {
g_defcodelabel (FalseLab);
/* Parse third expression. Remember for later if it is a NULL pointer
- * expression, then load it into the primary.
- */
+ ** expression, then load it into the primary.
+ */
ExprWithCheck (hie1, &Expr3);
Expr3IsNULL = ED_IsNullPtr (&Expr3);
if (!IsTypeVoid (Expr3.Type)) {
}
/* Check if any conversions are needed, if so, do them.
- * Conversion rules for ?: expression are:
- * - if both expressions are int expressions, default promotion
- * rules for ints apply.
- * - if both expressions are pointers of the same type, the
- * result of the expression is of this type.
- * - if one of the expressions is a pointer and the other is
- * a zero constant, the resulting type is that of the pointer
- * type.
- * - if both expressions are void expressions, the result is of
- * type void.
- * - all other cases are flagged by an error.
- */
+ ** Conversion rules for ?: expression are:
+ ** - if both expressions are int expressions, default promotion
+ ** rules for ints apply.
+ ** - if both expressions are pointers of the same type, the
+ ** result of the expression is of this type.
+ ** - if one of the expressions is a pointer and the other is
+ ** a zero constant, the resulting type is that of the pointer
+ ** type.
+ ** - if both expressions are void expressions, the result is of
+ ** type void.
+ ** - all other cases are flagged by an error.
+ */
if (IsClassInt (Expr2.Type) && IsClassInt (Expr3.Type)) {
CodeMark CvtCodeStart;
TypeConversion (&Expr3, ResultType);
/* Emit conversion code for the second expression, but remember
- * where it starts end ends.
- */
+ ** where it starts end ends.
+ */
GetCodePos (&CvtCodeStart);
TypeConversion (&Expr2, ResultType);
GetCodePos (&CvtCodeEnd);
if (!IsClassInt (Expr->Type) && !IsTypePtr (Expr->Type)) {
Error ("Invalid left operand type");
/* Continue. Wrong code will be generated, but the compiler won't
- * break, so this is the best error recovery.
- */
+ ** break, so this is the best error recovery.
+ */
}
/* Skip the operator token */
if (!IsClassInt (Expr2.Type)) {
Error ("Invalid right operand for binary operator `%s'", Op);
/* Continue. Wrong code will be generated, but the compiler won't
- * break, so this is the best error recovery.
- */
+ ** break, so this is the best error recovery.
+ */
}
/* Check for a constant expression */
if (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2)) {
/* The resulting value is a constant. If the generator has the NOPUSH
- * flag set, don't push the lhs.
- */
+ ** flag set, don't push the lhs.
+ */
if (Gen->Flags & GEN_NOPUSH) {
RemoveCode (&Mark);
}
}
/* If the lhs is character sized, the operation may be later done
- * with characters.
- */
+ ** with characters.
+ */
if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
flags |= CF_FORCECHAR;
}
}
/* If the lhs is character sized, the operation may be later done
- * with characters.
- */
+ ** with characters.
+ */
if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
flags |= CF_FORCECHAR;
}
if (!IsClassInt (Expr->Type) && !IsTypePtr (Expr->Type)) {
Error ("Invalid left operand type");
/* Continue. Wrong code will be generated, but the compiler won't
- * break, so this is the best error recovery.
- */
+ ** break, so this is the best error recovery.
+ */
}
/* Skip the operator */
rflags = 0;
/* Evaluate the rhs. We expect an integer here, since float is not
- * supported
- */
+ ** supported
+ */
hie1 (&Expr2);
if (!IsClassInt (Expr2.Type)) {
Error ("Invalid right operand for binary operator `%s'", Op);
/* Continue. Wrong code will be generated, but the compiler won't
- * break, so this is the best error recovery.
- */
+ ** break, so this is the best error recovery.
+ */
}
if (ED_IsConstAbs (&Expr2)) {
/* The resulting value is a constant. Scale it. */
int evalexpr (unsigned Flags, void (*Func) (ExprDesc*), ExprDesc* Expr)
/* Will evaluate an expression via the given function. If the result is a
- * constant, 0 is returned and the value is put in the Expr struct. If the
- * result is not constant, LoadExpr is called to bring the value into the
- * primary register and 1 is returned.
- */
+** constant, 0 is returned and the value is put in the Expr struct. If the
+** result is not constant, LoadExpr is called to bring the value into the
+** primary register and 1 is returned.
+*/
{
/* Evaluate */
ExprWithCheck (Func, Expr);
void ConstExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
/* Will evaluate an expression via the given function. If the result is not
- * a constant of some sort, a diagnostic will be printed, and the value is
- * replaced by a constant one to make sure there are no internal errors that
- * result from this input error.
- */
+** a constant of some sort, a diagnostic will be printed, and the value is
+** replaced by a constant one to make sure there are no internal errors that
+** result from this input error.
+*/
{
ExprWithCheck (Func, Expr);
if (!ED_IsConst (Expr)) {
void BoolExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
/* Will evaluate an expression via the given function. If the result is not
- * something that may be evaluated in a boolean context, a diagnostic will be
- * printed, and the value is replaced by a constant one to make sure there
- * are no internal errors that result from this input error.
- */
+** something that may be evaluated in a boolean context, a diagnostic will be
+** printed, and the value is replaced by a constant one to make sure there
+** are no internal errors that result from this input error.
+*/
{
ExprWithCheck (Func, Expr);
if (!ED_IsBool (Expr)) {
void ConstAbsIntExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
/* Will evaluate an expression via the given function. If the result is not
- * a constant numeric integer value, a diagnostic will be printed, and the
- * value is replaced by a constant one to make sure there are no internal
- * errors that result from this input error.
- */
+** a constant numeric integer value, a diagnostic will be printed, and the
+** value is replaced by a constant one to make sure there are no internal
+** errors that result from this input error.
+*/
{
ExprWithCheck (Func, Expr);
if (!ED_IsConstAbsInt (Expr)) {
projects / cc65 / blobdiff