-/*
- * expr.c
+/* expr.c
*
* Ullrich von Bassewitz, 21.06.1998
*/
#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
/* common */
#include "check.h"
+#include "debugflag.h"
#include "xmalloc.h"
/* cc65 */
#include "asmcode.h"
#include "asmlabel.h"
#include "asmstmt.h"
+#include "assignment.h"
#include "codegen.h"
-#include "datatype.h"
#include "declare.h"
#include "error.h"
#include "funcdesc.h"
#include "function.h"
#include "global.h"
#include "litpool.h"
+#include "loadexpr.h"
#include "macrotab.h"
#include "preproc.h"
#include "scanner.h"
+#include "shiftexpr.h"
+#include "stackptr.h"
+#include "standard.h"
#include "stdfunc.h"
#include "symtab.h"
#include "typecmp.h"
+#include "typeconv.h"
#include "expr.h"
} GenDesc;
/* Descriptors for the operations */
-static GenDesc GenMUL = { TOK_STAR, GEN_NOPUSH, g_mul };
-static GenDesc GenDIV = { TOK_DIV, GEN_NOPUSH, g_div };
-static GenDesc GenMOD = { TOK_MOD, GEN_NOPUSH, g_mod };
-static GenDesc GenASL = { TOK_SHL, GEN_NOPUSH, g_asl };
-static GenDesc GenASR = { TOK_SHR, GEN_NOPUSH, g_asr };
-static GenDesc GenLT = { TOK_LT, GEN_NOPUSH, g_lt };
-static GenDesc GenLE = { TOK_LE, GEN_NOPUSH, g_le };
-static GenDesc GenGE = { TOK_GE, GEN_NOPUSH, g_ge };
-static GenDesc GenGT = { TOK_GT, GEN_NOPUSH, g_gt };
-static GenDesc GenEQ = { TOK_EQ, GEN_NOPUSH, g_eq };
-static GenDesc GenNE = { TOK_NE, GEN_NOPUSH, g_ne };
-static GenDesc GenAND = { TOK_AND, GEN_NOPUSH, g_and };
-static GenDesc GenXOR = { TOK_XOR, GEN_NOPUSH, g_xor };
-static GenDesc GenOR = { TOK_OR, GEN_NOPUSH, g_or };
static GenDesc GenPASGN = { TOK_PLUS_ASSIGN, GEN_NOPUSH, g_add };
static GenDesc GenSASGN = { TOK_MINUS_ASSIGN, GEN_NOPUSH, g_sub };
static GenDesc GenMASGN = { TOK_MUL_ASSIGN, GEN_NOPUSH, g_mul };
/*****************************************************************************/
-/* Function forwards */
+/* Helper functions */
/*****************************************************************************/
-static int hie10 (ExprDesc* lval);
-/* Handle ++, --, !, unary - etc. */
-
-static int expr (int (*func) (ExprDesc*), ExprDesc *lval);
-/* Expression parser; func is either hie0 or hie1. */
+static unsigned GlobalModeFlags (const ExprDesc* Expr)
+/* Return the addressing mode flags for the given expression */
+{
+ switch (ED_GetLoc (Expr)) {
+ case E_LOC_ABS: return CF_ABSOLUTE;
+ case E_LOC_GLOBAL: return CF_EXTERNAL;
+ case E_LOC_STATIC: return CF_STATIC;
+ case E_LOC_REGISTER: return CF_REGVAR;
+ case E_LOC_STACK: return CF_NONE;
+ case E_LOC_PRIMARY: return CF_NONE;
+ case E_LOC_EXPR: return CF_NONE;
+ case E_LOC_LITERAL: return CF_STATIC; /* Same as static */
+ default:
+ Internal ("GlobalModeFlags: Invalid location flags value: 0x%04X", Expr->Flags);
+ /* NOTREACHED */
+ return 0;
+ }
+}
-/*****************************************************************************/
-/* Helper functions */
-/*****************************************************************************/
-
+void ExprWithCheck (void (*Func) (ExprDesc*), ExprDesc* Expr)
+/* Call an expression function with checks. */
+{
+ /* Remember the stack pointer */
+ int OldSP = StackPtr;
+ /* Call the expression function */
+ (*Func) (Expr);
-static unsigned GlobalModeFlags (unsigned flags)
-/* Return the addressing mode flags for the variable with the given flags */
-{
- flags &= E_MCTYPE;
- if (flags == E_TGLAB) {
- /* External linkage */
- return CF_EXTERNAL;
- } else if (flags == E_TREGISTER) {
- /* Register variable */
- return CF_REGVAR;
- } else {
- /* Static */
- return CF_STATIC;
+ /* Do some checks if code generation is still constistent */
+ if (StackPtr != OldSP) {
+ if (Debug) {
+ fprintf (stderr,
+ "Code generation messed up!\n"
+ "StackPtr is %d, should be %d",
+ StackPtr, OldSP);
+ } else {
+ Internal ("StackPtr is %d, should be %d\n", StackPtr, OldSP);
+ }
}
}
-static int IsNullPtr (ExprDesc* lval)
-/* Return true if this is the NULL pointer constant */
+void MarkedExprWithCheck (void (*Func) (ExprDesc*), ExprDesc* Expr)
+/* Call an expression function with checks and record start and end of the
+ * generated code.
+ */
{
- return (IsClassInt (lval->Type) && /* Is it an int? */
- lval->Flags == E_MCONST && /* Is it constant? */
- lval->ConstVal == 0); /* And is it's value zero? */
+ CodeMark Start, End;
+ GetCodePos (&Start);
+ ExprWithCheck (Func, Expr);
+ GetCodePos (&End);
+ ED_SetCodeRange (Expr, &Start, &End);
}
-static type* promoteint (type* lhst, type* rhst)
+static Type* promoteint (Type* lhst, Type* rhst)
/* In an expression with two ints, return the type of the result */
{
/* Rules for integer types:
if (IsSignUnsigned (lhst) || IsSignUnsigned (rhst)) {
return type_ulong;
} else {
- return type_long;
+ return type_long;
}
} else {
if (IsSignUnsigned (lhst) || IsSignUnsigned (rhst)) {
unsigned flags;
/* Get the type strings */
- type* lhst = lhs->Type;
- type* rhst = rhs->Type;
+ Type* lhst = lhs->Type;
+ Type* rhst = rhs->Type;
/* Generate type adjustment code if needed */
ltype = TypeOf (lhst);
- if (lhs->Flags == E_MCONST) {
+ if (ED_IsLocAbs (lhs)) {
ltype |= CF_CONST;
}
if (NoPush) {
ltype |= CF_REG;
}
rtype = TypeOf (rhst);
- if (rhs->Flags == E_MCONST) {
+ if (ED_IsLocAbs (rhs)) {
rtype |= CF_CONST;
}
flags = g_typeadjust (ltype, rtype);
-unsigned assignadjust (type* lhst, ExprDesc* rhs)
-/* Adjust the type of the right hand expression so that it can be assigned to
- * the type on the left hand side. This function is used for assignment and
- * for converting parameters in a function call. It returns the code generator
- * flags for the operation. The type string of the right hand side will be
- * set to the type of the left hand side.
- */
-{
- /* Get the type of the right hand side. Treat function types as
- * pointer-to-function
- */
- type* rhst = rhs->Type;
- if (IsTypeFunc (rhst)) {
- rhst = PointerTo (rhst);
- }
-
- /* After calling this function, rhs will have the type of the lhs */
- rhs->Type = lhst;
-
- /* First, do some type checking */
- if (IsTypeVoid (lhst) || IsTypeVoid (rhst)) {
- /* If one of the sides are of type void, output a more apropriate
- * error message.
- */
- Error ("Illegal type");
- } else if (IsClassInt (lhst)) {
- if (IsClassPtr (rhst)) {
- /* Pointer -> int conversion */
- Warning ("Converting pointer to integer without a cast");
- } else if (!IsClassInt (rhst)) {
- Error ("Incompatible types");
- } else {
- /* Convert the rhs to the type of the lhs. */
- unsigned flags = TypeOf (rhst);
- if (rhs->Flags == E_MCONST) {
- flags |= CF_CONST;
- }
- return g_typecast (TypeOf (lhst), flags);
- }
- } else if (IsClassPtr (lhst)) {
- if (IsClassPtr (rhst)) {
- /* Pointer to pointer assignment is valid, if:
- * - both point to the same types, or
- * - the rhs pointer is a void pointer, or
- * - the lhs pointer is a void pointer.
- */
- if (!IsTypeVoid (Indirect (lhst)) && !IsTypeVoid (Indirect (rhst))) {
- /* Compare the types */
- switch (TypeCmp (lhst, rhst)) {
-
- case TC_INCOMPATIBLE:
- Error ("Incompatible pointer types");
- break;
-
- case TC_QUAL_DIFF:
- Error ("Pointer types differ in type qualifiers");
- break;
-
- default:
- /* Ok */
- break;
- }
- }
- } else if (IsClassInt (rhst)) {
- /* Int to pointer assignment is valid only for constant zero */
- if (rhs->Flags != E_MCONST || rhs->ConstVal != 0) {
- Warning ("Converting integer to pointer without a cast");
- }
- } else if (IsTypeFuncPtr (lhst) && IsTypeFunc(rhst)) {
- /* Assignment of function to function pointer is allowed, provided
- * that both functions have the same parameter list.
- */
- if (TypeCmp (Indirect (lhst), rhst) < TC_EQUAL) {
- Error ("Incompatible types");
- }
- } else {
- Error ("Incompatible types");
- }
- } else {
- Error ("Incompatible types");
- }
-
- /* Return an int value in all cases where the operands are not both ints */
- return CF_INT;
-}
-
-
-
-void DefineData (ExprDesc* Expr)
-/* Output a data definition for the given expression */
-{
- unsigned Flags = Expr->Flags;
-
- switch (Flags & E_MCTYPE) {
-
- case E_TCONST:
- /* Number */
- g_defdata (TypeOf (Expr->Type) | CF_CONST, Expr->ConstVal, 0);
- break;
-
- case E_TREGISTER:
- /* Register variable. Taking the address is usually not
- * allowed.
- */
- if (!AllowRegVarAddr) {
- Error ("Cannot take the address of a register variable");
- }
- /* FALLTHROUGH */
-
- case E_TGLAB:
- case E_TLLAB:
- /* Local or global symbol */
- g_defdata (GlobalModeFlags (Flags), Expr->Name, Expr->ConstVal);
- break;
-
- case E_TLIT:
- /* a literal of some kind */
- g_defdata (CF_STATIC, LiteralPoolLabel, Expr->ConstVal);
- break;
-
- default:
- Internal ("Unknown constant type: %04X", Flags);
- }
-}
-
-
-
-static void lconst (unsigned Flags, ExprDesc* Expr)
-/* Load the primary register with some constant value. */
-{
- switch (Expr->Flags & E_MCTYPE) {
-
- case E_TLOFFS:
- g_leasp (Expr->ConstVal);
- break;
-
- case E_TCONST:
- /* Number constant */
- g_getimmed (Flags | TypeOf (Expr->Type) | CF_CONST, Expr->ConstVal, 0);
- break;
-
- case E_TREGISTER:
- /* Register variable. Taking the address is usually not
- * allowed.
- */
- if (!AllowRegVarAddr) {
- Error ("Cannot take the address of a register variable");
- }
- /* FALLTHROUGH */
-
- case E_TGLAB:
- case E_TLLAB:
- /* Local or global symbol, load address */
- Flags |= GlobalModeFlags (Expr->Flags);
- Flags &= ~CF_CONST;
- g_getimmed (Flags, Expr->Name, Expr->ConstVal);
- break;
-
- case E_TLIT:
- /* Literal string */
- g_getimmed (CF_STATIC, LiteralPoolLabel, Expr->ConstVal);
- break;
-
- default:
- Internal ("Unknown constant type: %04X", Expr->Flags);
- }
-}
-
-
-
-static int kcalc (int tok, long val1, long val2)
-/* Calculate an operation with left and right operand constant. */
-{
- switch (tok) {
- case TOK_EQ:
- return (val1 == val2);
- case TOK_NE:
- return (val1 != val2);
- case TOK_LT:
- return (val1 < val2);
- case TOK_LE:
- return (val1 <= val2);
- case TOK_GE:
- return (val1 >= val2);
- case TOK_GT:
- return (val1 > val2);
- case TOK_OR:
- return (val1 | val2);
- case TOK_XOR:
- return (val1 ^ val2);
- case TOK_AND:
- return (val1 & val2);
- case TOK_SHR:
- return (val1 >> val2);
- case TOK_SHL:
- return (val1 << val2);
- case TOK_STAR:
- return (val1 * val2);
- case TOK_DIV:
- if (val2 == 0) {
- Error ("Division by zero");
- return 0x7FFFFFFF;
- }
- return (val1 / val2);
- case TOK_MOD:
- if (val2 == 0) {
- Error ("Modulo operation with zero");
- return 0;
- }
- return (val1 % val2);
- default:
- Internal ("kcalc: got token 0x%X\n", tok);
- return 0;
- }
-}
-
-
-
-static const GenDesc* FindGen (token_t Tok, const GenDesc** Table)
+static const GenDesc* FindGen (token_t Tok, const GenDesc* Table)
/* Find a token in a generator table */
{
- const GenDesc* G;
- while ((G = *Table) != 0) {
- if (G->Tok == Tok) {
- return G;
+ while (Table->Tok != TOK_INVALID) {
+ if (Table->Tok == Tok) {
+ return Table;
}
++Table;
}
-static int istypeexpr (void)
-/* Return true if some sort of variable or type is waiting (helper for cast
- * and sizeof() in hie10).
+static int TypeSpecAhead (void)
+/* Return true if some sort of type is waiting (helper for cast and sizeof()
+ * 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
+ */
return CurTok.Tok == TOK_LPAREN && (
- (NextTok.Tok >= TOK_FIRSTTYPE && NextTok.Tok <= TOK_LASTTYPE) ||
- (NextTok.Tok == TOK_CONST) ||
- (NextTok.Tok == TOK_IDENT &&
- (Entry = FindSym (NextTok.Ident)) != 0 &&
- IsTypeDef (Entry)));
+ TokIsType (&NextTok) ||
+ TokIsTypeQual (&NextTok) ||
+ (NextTok.Tok == TOK_IDENT &&
+ (Entry = FindSym (NextTok.Ident)) != 0 &&
+ SymIsTypeDef (Entry)));
}
-static void PushAddr (ExprDesc* lval)
+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
*/
{
/* Get the address on stack if needed */
- if (lval->Flags != E_MREG && (lval->Flags & E_MEXPR)) {
- /* Push the address (always a pointer) */
- g_push (CF_PTR, 0);
- }
-}
-
-
-
-static void MakeConstIntExpr (ExprDesc* Expr, long Value)
-/* Make Expr a constant integer expression with the given value */
-{
- Expr->Flags = E_MCONST;
- Expr->Type = type_int;
- Expr->ConstVal = Value;
-}
-
-
-
-void ConstSubExpr (int (*F) (ExprDesc*), ExprDesc* Expr)
-/* Will evaluate an expression via the given function. If the result is not
- * a constant, 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.
- */
-{
- memset (Expr, 0, sizeof (*Expr));
- if (F (Expr) != 0 || Expr->Flags != E_MCONST) {
- Error ("Constant expression expected");
- /* To avoid any compiler errors, make the expression a valid const */
- MakeConstIntExpr (Expr, 1);
+ if (ED_IsLocExpr (Expr)) {
+ /* Push the address (always a pointer) */
+ g_push (CF_PTR, 0);
}
}
/*****************************************************************************/
-/* code */
+/* code */
/*****************************************************************************/
-void exprhs (unsigned flags, int k, ExprDesc *lval)
-/* Put the result of an expression into the primary register */
-{
- int f;
-
- f = lval->Flags;
- if (k) {
- /* Dereferenced lvalue */
- flags |= TypeOf (lval->Type);
- if (lval->Test & E_FORCETEST) {
- flags |= CF_TEST;
- lval->Test &= ~E_FORCETEST;
- }
- if (f & E_MGLOBAL) { /* ref to globalvar */
- /* Generate code */
- flags |= GlobalModeFlags (f);
- g_getstatic (flags, lval->Name, lval->ConstVal);
- } else if (f & E_MLOCAL) {
- /* ref to localvar */
- g_getlocal (flags, lval->ConstVal);
- } else if (f & E_MCONST) {
- /* ref to absolute address */
- g_getstatic (flags | CF_ABSOLUTE, lval->ConstVal, 0);
- } else if (f == E_MEOFFS) {
- g_getind (flags, lval->ConstVal);
- } else if (f != E_MREG) {
- g_getind (flags, 0);
- }
- } else if (f == E_MEOFFS) {
- /* reference not storable */
- flags |= TypeOf (lval->Type);
- g_inc (flags | CF_CONST, lval->ConstVal);
- } else if ((f & E_MEXPR) == 0) {
- /* Constant of some sort, load it into the primary */
- lconst (flags, lval);
- }
- if (lval->Test & E_FORCETEST) { /* we testing this value? */
- /* debug... */
- flags |= TypeOf (lval->Type);
- g_test (flags); /* yes, force a test */
- lval->Test &= ~E_FORCETEST;
- }
-}
-
-
-
-static unsigned FunctionParamList (FuncDesc* Func)
+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
* The function returns the size of the parameters pushed.
*/
{
- ExprDesc lval;
+ ExprDesc Expr;
/* Initialize variables */
SymEntry* Param = 0; /* Keep gcc silent */
* 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 (CodeSizeFactor >= 200) {
+ if (IS_Get (&CodeSizeFactor) >= 200) {
/* Calculate the number and size of the parameters */
FrameParams = Func->ParamCount;
FrameSize = Func->ParamSize;
- if (FrameParams > 0 && (Func->Flags & FD_FASTCALL) != 0) {
+ if (FrameParams > 0 && IsFastcall) {
/* Last parameter is not pushed */
- const SymEntry* LastParam = Func->SymTab->SymTail;
- FrameSize -= CheckedSizeOf (LastParam->Type);
+ FrameSize -= CheckedSizeOf (Func->LastParam->Type);
--FrameParams;
}
- /* Do we have more than one parameter in the frame? */
+ /* Do we have more than one parameter in the frame? */
if (FrameParams > 1) {
/* Okeydokey, setup the frame */
- FrameOffs = oursp;
+ FrameOffs = StackPtr;
g_space (FrameSize);
- oursp -= FrameSize;
+ StackPtr -= FrameSize;
} else {
/* Don't use a preallocated frame */
FrameSize = 0;
/* Parse the actual parameter list */
while (CurTok.Tok != TOK_RPAREN) {
- unsigned CFlags;
unsigned Flags;
/* Count arguments */
if ((Func->Flags & FD_VARIADIC) == 0) {
/* End of param list reached, no ellipsis */
Error ("Too many arguments in function call");
- }
+ }
/* Assume an ellipsis even in case of errors to avoid an error
* message for each other argument.
*/
Ellipsis = 1;
}
- /* Do some optimization: If we have a constant value to push,
- * use a special function that may optimize.
- */
- CFlags = CF_NONE;
- if (!Ellipsis && CheckedSizeOf (Param->Type) == 1) {
- CFlags = CF_FORCECHAR;
- }
- Flags = CF_NONE;
- if (evalexpr (CFlags, hie1, &lval) == 0) {
- /* A constant value */
- Flags |= CF_CONST;
- }
+ /* Evaluate the parameter expression */
+ hie1 (&Expr);
/* If we don't have an argument spec, accept anything, otherwise
* convert the actual argument to the type needed.
*/
+ Flags = CF_NONE;
if (!Ellipsis) {
- /* Promote the argument if needed */
- assignadjust (Param->Type, &lval);
+
+ /* Convert the argument to the parameter type if needed */
+ TypeConversion (&Expr, Param->Type);
/* If we have a prototype, chars may be pushed as chars */
Flags |= CF_FORCECHAR;
- }
+
+ } else {
+
+ /* No prototype available. Convert array to "pointer to first
+ * element", and function to "pointer to function".
+ */
+ Expr.Type = PtrConversion (Expr.Type);
+
+ }
+
+ /* Load the value into the primary if it is not already there */
+ LoadExpr (Flags, &Expr);
/* Use the type of the argument for the push */
- Flags |= TypeOf (lval.Type);
+ Flags |= TypeOf (Expr.Type);
/* If this is a fastcall function, don't push the last argument */
- if (ParamCount == Func->ParamCount && (Func->Flags & FD_FASTCALL) != 0) {
- /* Just load the argument into the primary. This is only needed if
- * we have a constant argument, otherwise the value is already in
- * the primary.
- */
- if (Flags & CF_CONST) {
- exprhs (CF_FORCECHAR, 0, &lval);
- }
- } else {
+ if (ParamCount != Func->ParamCount || !IsFastcall) {
unsigned ArgSize = sizeofarg (Flags);
if (FrameSize > 0) {
- /* We have the space already allocated, store in the frame */
- CHECK (FrameSize >= ArgSize);
- FrameSize -= ArgSize;
+ /* 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.
+ */
+ if (FrameSize >= ArgSize) {
+ FrameSize -= ArgSize;
+ } else {
+ FrameSize = 0;
+ }
FrameOffs -= ArgSize;
/* Store */
- g_putlocal (Flags | CF_NOKEEP, FrameOffs, lval.ConstVal);
+ g_putlocal (Flags | CF_NOKEEP, FrameOffs, Expr.IVal);
} else {
/* Push the argument */
- g_push (Flags, lval.ConstVal);
+ g_push (Flags, Expr.IVal);
}
/* Calculate total parameter size */
-static void FunctionCall (int k, ExprDesc* lval)
+static void FunctionCall (ExprDesc* Expr)
/* Perform a function call. */
{
FuncDesc* Func; /* Function descriptor */
int IsFuncPtr; /* Flag */
unsigned ParamSize; /* Number of parameter bytes */
- CodeMark Mark = 0; /* Initialize to keep gcc silent */
+ 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 */
+ NextToken ();
+
/* Get a pointer to the function descriptor from the type string */
- Func = GetFuncDesc (lval->Type);
+ Func = GetFuncDesc (Expr->Type);
/* Handle function pointers transparently */
- IsFuncPtr = IsTypeFuncPtr (lval->Type);
+ IsFuncPtr = IsTypeFuncPtr (Expr->Type);
if (IsFuncPtr) {
/* Check wether it's a fastcall function that has parameters */
- IsFastCall = IsFastCallFunc (lval->Type + 1) && (Func->ParamCount > 0);
+ 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
* For fastcall functions we do also need to place a copy of the
* pointer on stack, since we cannot use a/x.
*/
- PtrOnStack = IsFastCall || ((lval->Flags & (E_MGLOBAL | E_MLOCAL)) == 0);
+ 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.
*/
- exprhs (CF_NONE, k, lval);
- lval->Flags |= E_MEXPR;
+ LoadExpr (CF_NONE, Expr);
+ ED_MakeRValExpr (Expr);
/* Remember the code position */
- Mark = GetCodePos ();
+ GetCodePos (&Mark);
/* Push the pointer onto the stack and remember the offset */
g_push (CF_PTR, 0);
- PtrOffs = oursp;
+ PtrOffs = StackPtr;
}
- /* Check for known standard functions and inline them if requested */
- } else if (InlineStdFuncs && IsStdFunc ((const char*) lval->Name)) {
+ } else {
+ /* Check function attributes */
+ if (Expr->Sym && SymHasAttr (Expr->Sym, atNoReturn)) {
+ /* For now, handle as if a return statement was encountered */
+ F_ReturnFound (CurrentFunc);
+ }
- /* Inline this function */
- HandleStdFunc (Func, lval);
- return;
+ /* Check for known standard functions and inline them */
+ if (Expr->Name != 0) {
+ int StdFunc = FindStdFunc ((const char*) Expr->Name);
+ if (StdFunc >= 0) {
+ /* Inline this function */
+ HandleStdFunc (StdFunc, Func, Expr);
+ return;
+ }
+ }
+ /* If we didn't inline the function, get fastcall info */
+ IsFastcall = IsQualFastcall (Expr->Type);
}
/* Parse the parameter list */
- ParamSize = FunctionParamList (Func);
+ ParamSize = FunctionParamList (Func, IsFastcall);
/* We need the closing paren here */
ConsumeRParen ();
/* If the function is not a fastcall function, load the pointer to
* the function into the primary.
*/
- if (!IsFastCall) {
+ if (!IsFastcall) {
/* Not a fastcall function - we may use the primary */
if (PtrOnStack) {
* stack pointer.
*/
if (ParamSize == 0) {
- RemoveCode (Mark);
- pop (CF_PTR);
+ RemoveCode (&Mark);
PtrOnStack = 0;
} else {
- /* Load from the saved copy */
+ /* Load from the saved copy */
g_getlocal (CF_PTR, PtrOffs);
}
} else {
/* Load from original location */
- exprhs (CF_NONE, k, lval);
+ LoadExpr (CF_NONE, Expr);
}
/* Call the function */
- g_callind (TypeOf (lval->Type+1), ParamSize, PtrOffs);
+ g_callind (TypeOf (Expr->Type+1), ParamSize, PtrOffs);
} else {
/* If we have a pointer on stack, remove it */
if (PtrOnStack) {
- g_space (- (int) sizeofarg (CF_PTR));
+ g_drop (SIZEOF_PTR);
pop (CF_PTR);
}
/* Skip T_PTR */
- ++lval->Type;
+ ++Expr->Type;
} else {
/* Normal function */
- g_call (TypeOf (lval->Type), (const char*) lval->Name, ParamSize);
+ g_call (TypeOf (Expr->Type), (const char*) Expr->Name, ParamSize);
}
+
+ /* The function result is an rvalue in the primary register */
+ ED_MakeRValExpr (Expr);
+ Expr->Type = GetFuncReturn (Expr->Type);
}
-static int primary (ExprDesc* lval)
+static void Primary (ExprDesc* E)
/* This is the lowest level of the expression parser. */
{
- int k;
+ SymEntry* Sym;
+ Literal* L;
/* Initialize fields in the expression stucture */
- lval->Test = 0; /* No test */
- lval->Sym = 0; /* Symbol unknown */
+ ED_Init (E);
/* Character and integer constants. */
if (CurTok.Tok == TOK_ICONST || CurTok.Tok == TOK_CCONST) {
- lval->Flags = E_MCONST | E_TCONST;
- lval->Type = CurTok.Type;
- lval->ConstVal = CurTok.IVal;
+ E->IVal = CurTok.IVal;
+ E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
+ E->Type = CurTok.Type;
NextToken ();
- return 0;
+ return;
+ }
+
+ /* Floating point constant */
+ if (CurTok.Tok == TOK_FCONST) {
+ E->FVal = CurTok.FVal;
+ E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
+ E->Type = CurTok.Type;
+ NextToken ();
+ return;
}
/* Process parenthesized subexpression by calling the whole parser
* recursively.
*/
if (CurTok.Tok == TOK_LPAREN) {
- NextToken ();
- memset (lval, 0, sizeof (*lval)); /* Remove any attributes */
- k = hie0 (lval);
+ NextToken ();
+ hie0 (E);
ConsumeRParen ();
- return k;
+ return;
}
/* 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.
*/
if (Preprocessing && CurTok.Tok == TOK_IDENT) {
- MakeConstIntExpr (lval, 0);
- return 0;
+ NextToken ();
+ ED_MakeConstAbsInt (E, 0);
+ return;
}
/* All others may only be used if the expression evaluation is not called
if (Preprocessing) {
/* Illegal expression in PP mode */
Error ("Preprocessor expression expected");
- MakeConstIntExpr (lval, 1);
- return 0;
- }
-
- /* Identifier? */
- if (CurTok.Tok == TOK_IDENT) {
-
- SymEntry* Sym;
- ident Ident;
-
- /* Get a pointer to the symbol table entry */
- Sym = lval->Sym = FindSym (CurTok.Ident);
-
- /* Is the symbol known? */
- if (Sym) {
-
- /* We found the symbol - skip the name token */
- NextToken ();
-
- /* The expression type is the symbol type */
- lval->Type = Sym->Type;
-
- /* Check for illegal symbol types */
- CHECK ((Sym->Flags & SC_LABEL) != SC_LABEL);
- if (Sym->Flags & SC_TYPE) {
- /* Cannot use type symbols */
- Error ("Variable identifier expected");
- /* Assume an int type to make lval valid */
- lval->Flags = E_MLOCAL | E_TLOFFS;
- lval->Type = type_int;
- lval->ConstVal = 0;
- return 0;
- }
-
- /* Check for legal symbol types */
- if ((Sym->Flags & SC_CONST) == SC_CONST) {
- /* Enum or some other numeric constant */
- lval->Flags = E_MCONST;
- lval->ConstVal = Sym->V.ConstVal;
- return 0;
- } else if ((Sym->Flags & SC_FUNC) == SC_FUNC) {
- /* Function */
- lval->Flags = E_MGLOBAL | E_MCONST | E_TGLAB;
- lval->Name = (unsigned long) Sym->Name;
- lval->ConstVal = 0;
- } 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.
- */
- if ((Sym->Flags & SC_PARAM) == SC_PARAM && F_IsVariadic (CurrentFunc)) {
- /* Variadic parameter */
- g_leavariadic (Sym->V.Offs - F_GetParamSize (CurrentFunc));
- lval->Flags = E_MEXPR;
- lval->ConstVal = 0;
- } else {
- /* Normal parameter */
- lval->Flags = E_MLOCAL | E_TLOFFS;
- lval->ConstVal = Sym->V.Offs;
- }
- } else if ((Sym->Flags & SC_STATIC) == SC_STATIC) {
- /* Static variable */
- if (Sym->Flags & (SC_EXTERN | SC_STORAGE)) {
- lval->Flags = E_MGLOBAL | E_MCONST | E_TGLAB;
- lval->Name = (unsigned long) Sym->Name;
- } else {
- lval->Flags = E_MGLOBAL | E_MCONST | E_TLLAB;
- lval->Name = Sym->V.Label;
- }
- lval->ConstVal = 0;
- } else if ((Sym->Flags & SC_REGISTER) == SC_REGISTER) {
- /* Register variable, zero page based */
- lval->Flags = E_MGLOBAL | E_MCONST | E_TREGISTER;
- lval->Name = Sym->V.Offs;
- lval->ConstVal = 0;
- } else {
- /* Local static variable */
- lval->Flags = E_MGLOBAL | E_MCONST | E_TLLAB;
- lval->Name = Sym->V.Offs;
- lval->ConstVal = 0;
- }
-
- /* The symbol is referenced now */
- Sym->Flags |= SC_REF;
- if (IsTypeFunc (lval->Type) || IsTypeArray (lval->Type)) {
- return 0;
- }
- return 1;
- }
-
- /* We did not find the symbol. Remember the name, then skip it */
- strcpy (Ident, CurTok.Ident);
- NextToken ();
-
- /* IDENT is either an auto-declared function or an undefined variable. */
- if (CurTok.Tok == TOK_LPAREN) {
- /* Declare a function returning int. For that purpose, prepare a
- * function signature for a function having an empty param list
- * and returning int.
- */
- Warning ("Function call without a prototype");
- Sym = AddGlobalSym (Ident, GetImplicitFuncType(), SC_EXTERN | SC_REF | SC_FUNC);
- lval->Type = Sym->Type;
- lval->Flags = E_MGLOBAL | E_MCONST | E_TGLAB;
- lval->Name = (unsigned long) Sym->Name;
- lval->ConstVal = 0;
- return 0;
-
- } else {
-
- /* Undeclared Variable */
- Sym = AddLocalSym (Ident, type_int, SC_AUTO | SC_REF, 0);
- lval->Flags = E_MLOCAL | E_TLOFFS;
- lval->Type = type_int;
- lval->ConstVal = 0;
- Error ("Undefined symbol: `%s'", Ident);
- return 1;
-
- }
- }
-
- /* String literal? */
- if (CurTok.Tok == TOK_SCONST) {
- lval->Flags = E_MCONST | E_TLIT;
- lval->ConstVal = CurTok.IVal;
- lval->Type = GetCharArrayType (GetLiteralPoolOffs () - CurTok.IVal);
- NextToken ();
- return 0;
+ ED_MakeConstAbsInt (E, 1);
+ return;
}
- /* ASM statement? */
- if (CurTok.Tok == TOK_ASM) {
- AsmStatement ();
- lval->Type = type_void;
- lval->Flags = E_MEXPR;
- lval->ConstVal = 0;
- return 0;
- }
+ switch (CurTok.Tok) {
- /* __AX__ and __EAX__ pseudo values? */
- if (CurTok.Tok == TOK_AX || CurTok.Tok == TOK_EAX) {
- lval->Type = (CurTok.Tok == TOK_AX)? type_uint : type_ulong;
- lval->Flags = E_MREG;
- lval->Test &= ~E_CC;
- lval->ConstVal = 0;
- NextToken ();
- return 1; /* May be used as lvalue */
+ case TOK_IDENT:
+ /* Identifier. Get a pointer to the symbol table entry */
+ Sym = E->Sym = FindSym (CurTok.Ident);
+
+ /* Is the symbol known? */
+ if (Sym) {
+
+ /* We found the symbol - skip the name token */
+ NextToken ();
+
+ /* Check for illegal symbol types */
+ CHECK ((Sym->Flags & SC_LABEL) != SC_LABEL);
+ if (Sym->Flags & SC_TYPE) {
+ /* Cannot use type symbols */
+ Error ("Variable identifier expected");
+ /* Assume an int type to make E valid */
+ E->Flags = E_LOC_STACK | E_RTYPE_LVAL;
+ E->Type = type_int;
+ return;
+ }
+
+ /* Mark the symbol as referenced */
+ Sym->Flags |= SC_REF;
+
+ /* The expression type is the symbol type */
+ E->Type = Sym->Type;
+
+ /* Check for legal symbol types */
+ if ((Sym->Flags & SC_CONST) == SC_CONST) {
+ /* Enum or some other numeric constant */
+ E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
+ E->IVal = Sym->V.ConstVal;
+ } else if ((Sym->Flags & SC_FUNC) == SC_FUNC) {
+ /* Function */
+ E->Flags = E_LOC_GLOBAL | E_RTYPE_LVAL;
+ 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.
+ */
+ if ((Sym->Flags & SC_PARAM) == SC_PARAM && F_IsVariadic (CurrentFunc)) {
+ /* Variadic parameter */
+ g_leavariadic (Sym->V.Offs - F_GetParamSize (CurrentFunc));
+ E->Flags = E_LOC_EXPR | E_RTYPE_LVAL;
+ } else {
+ /* Normal parameter */
+ E->Flags = E_LOC_STACK | E_RTYPE_LVAL;
+ E->IVal = Sym->V.Offs;
+ }
+ } else if ((Sym->Flags & SC_REGISTER) == SC_REGISTER) {
+ /* Register variable, zero page based */
+ E->Flags = E_LOC_REGISTER | E_RTYPE_LVAL;
+ E->Name = Sym->V.R.RegOffs;
+ } else if ((Sym->Flags & SC_STATIC) == SC_STATIC) {
+ /* Static variable */
+ if (Sym->Flags & (SC_EXTERN | SC_STORAGE)) {
+ E->Flags = E_LOC_GLOBAL | E_RTYPE_LVAL;
+ E->Name = (unsigned long) Sym->Name;
+ } else {
+ E->Flags = E_LOC_STATIC | E_RTYPE_LVAL;
+ E->Name = Sym->V.Label;
+ }
+ } else {
+ /* Local static variable */
+ E->Flags = E_LOC_STATIC | E_RTYPE_LVAL;
+ E->Name = Sym->V.Offs;
+ }
+
+ /* 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.
+ */
+ if (IsTypeArray (E->Type) || IsTypeFunc (E->Type)) {
+ ED_MakeRVal (E);
+ }
+
+ } else {
+
+ /* We did not find the symbol. Remember the name, then skip it */
+ ident Ident;
+ strcpy (Ident, CurTok.Ident);
+ NextToken ();
+
+ /* 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.
+ */
+ if (IS_Get (&Standard) >= STD_C99) {
+ Error ("Call to undefined function `%s'", Ident);
+ } else {
+ Warning ("Call to undefined function `%s'", Ident);
+ }
+ Sym = AddGlobalSym (Ident, GetImplicitFuncType(), SC_EXTERN | SC_REF | SC_FUNC);
+ E->Type = Sym->Type;
+ E->Flags = E_LOC_GLOBAL | E_RTYPE_RVAL;
+ E->Name = (unsigned long) Sym->Name;
+ } else {
+ /* Undeclared Variable */
+ Sym = AddLocalSym (Ident, type_int, SC_AUTO | SC_REF, 0);
+ E->Flags = E_LOC_STACK | E_RTYPE_LVAL;
+ E->Type = type_int;
+ Error ("Undefined symbol: `%s'", Ident);
+ }
+
+ }
+ break;
+
+ case TOK_SCONST:
+ case TOK_WCSCONST:
+ /* String literal */
+ L = UseLiteral (CurTok.SVal);
+ E->Type = GetCharArrayType (GetLiteralSize (CurTok.SVal));
+ E->Flags = E_LOC_LITERAL | E_RTYPE_RVAL;
+ E->IVal = 0;
+ E->Name = GetLiteralLabel (CurTok.SVal);
+ NextToken ();
+ break;
+
+ case TOK_ASM:
+ /* ASM statement */
+ AsmStatement ();
+ E->Flags = E_LOC_EXPR | E_RTYPE_RVAL;
+ E->Type = type_void;
+ break;
+
+ case TOK_A:
+ /* Register pseudo variable */
+ E->Type = type_uchar;
+ E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
+ NextToken ();
+ break;
+
+ case TOK_AX:
+ /* Register pseudo variable */
+ E->Type = type_uint;
+ E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
+ NextToken ();
+ break;
+
+ case TOK_EAX:
+ /* Register pseudo variable */
+ E->Type = type_ulong;
+ E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
+ NextToken ();
+ break;
+
+ default:
+ /* Illegal primary. Be sure to skip the token to avoid endless
+ * error loops.
+ */
+ Error ("Expression expected");
+ NextToken ();
+ ED_MakeConstAbsInt (E, 1);
+ break;
}
-
- /* Illegal primary. */
- Error ("Expression expected");
- MakeConstIntExpr (lval, 1);
- return 0;
}
-static int arrayref (int k, ExprDesc* lval)
-/* Handle an array reference */
+static void ArrayRef (ExprDesc* Expr)
+/* Handle an array reference. This function needs a rewrite. */
{
- unsigned lflags;
- unsigned rflags;
- int ConstBaseAddr;
- int ConstSubAddr;
- int l;
- ExprDesc lval2;
- CodeMark Mark1;
- CodeMark Mark2;
- type* tptr1;
- type* tptr2;
+ int ConstBaseAddr;
+ ExprDesc Subscript;
+ CodeMark Mark1;
+ CodeMark Mark2;
+ TypeCode Qualifiers;
+ Type* ElementType;
+ Type* tptr1;
/* Skip the bracket */
NextToken ();
/* Get the type of left side */
- tptr1 = lval->Type;
+ 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.
*/
- lflags = lval->Flags & ~E_MCTYPE;
- ConstBaseAddr = (lflags == E_MCONST) || /* Constant numeric address */
- (lflags & E_MGLOBAL) != 0 || /* Static array, or ... */
- lflags == E_MLOCAL; /* Local array */
+ ConstBaseAddr = ED_IsRVal (Expr) &&
+ (ED_IsLocConst (Expr) || ED_IsLocStack (Expr));
/* If we have a constant base, we delay the address fetch */
- Mark1 = GetCodePos ();
- Mark2 = 0; /* Silence gcc */
+ GetCodePos (&Mark1);
if (!ConstBaseAddr) {
/* Get a pointer to the array into the primary */
- exprhs (CF_NONE, k, lval);
+ 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.
*/
- Mark2 = GetCodePos ();
+ GetCodePos (&Mark2);
g_push (CF_PTR, 0);
}
/* TOS now contains ptr to array elements. Get the subscript. */
- l = hie0 (&lval2);
- if (l == 0 && lval2.Flags == E_MCONST) {
+ 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.
+ */
+ Qualifiers = T_QUAL_NONE;
+ if (IsClassPtr (Expr->Type)) {
+ if (!IsClassInt (Subscript.Type)) {
+ Error ("Array subscript is not an integer");
+ /* To avoid any compiler errors, make the expression a valid int */
+ ED_MakeConstAbsInt (&Subscript, 0);
+ }
+ if (IsTypeArray (Expr->Type)) {
+ Qualifiers = GetQualifier (Expr->Type);
+ }
+ ElementType = Indirect (Expr->Type);
+ } else if (IsClassInt (Expr->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.
+ */
+ ED_MakeConstAbs (&Subscript, 0, GetCharArrayType (1));
+ } else if (IsTypeArray (Subscript.Type)) {
+ Qualifiers = GetQualifier (Subscript.Type);
+ }
+ ElementType = Indirect (Subscript.Type);
+ } else {
+ Error ("Cannot subscript");
+ /* To avoid compiler errors, fake both the array and the subscript, so
+ * 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).
+ */
+ if (GetQualifier (ElementType) != (GetQualifier (ElementType) | Qualifiers)) {
+ ElementType = TypeDup (ElementType);
+ ElementType->C |= Qualifiers;
+ }
+
+ /* If the subscript is a bit-field, load it and make it an rvalue */
+ if (ED_IsBitField (&Subscript)) {
+ LoadExpr (CF_NONE, &Subscript);
+ ED_MakeRValExpr (&Subscript);
+ }
+
+ /* Check if the subscript is constant absolute value */
+ if (ED_IsConstAbs (&Subscript) && ED_CodeRangeIsEmpty (&Subscript)) {
- /* The array subscript is a constant - remove value from stack */
+ /* 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.
+ */
if (!ConstBaseAddr) {
- RemoveCode (Mark2);
- pop (CF_PTR);
+ RemoveCode (&Mark2);
} else {
/* Get an array pointer into the primary */
- exprhs (CF_NONE, k, lval);
+ LoadExpr (CF_NONE, Expr);
}
- if (IsClassPtr (tptr1)) {
+ if (IsClassPtr (Expr->Type)) {
- /* Scale the subscript value according to element size */
- lval2.ConstVal *= CheckedPSizeOf (tptr1);
+ /* Lhs is pointer/array. Scale the subscript value according to
+ * the element size.
+ */
+ Subscript.IVal *= CheckedSizeOf (ElementType);
- /* Remove code for lhs load */
- RemoveCode (Mark1);
+ /* Remove the address load code */
+ RemoveCode (&Mark1);
- /* Handle constant base array on stack. Be sure NOT to
- * handle pointers the same way, this won't work.
- */
- if (IsTypeArray (tptr1) &&
- ((lval->Flags & ~E_MCTYPE) == E_MCONST ||
- (lval->Flags & ~E_MCTYPE) == E_MLOCAL ||
- (lval->Flags & E_MGLOBAL) != 0 ||
- (lval->Flags == E_MEOFFS))) {
- lval->ConstVal += lval2.ConstVal;
+ /* 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.
+ */
+ if (IsTypeArray (Expr->Type)) {
- } else {
- /* Pointer - load into primary and remember offset */
- if ((lval->Flags & E_MEXPR) == 0 || k != 0) {
- exprhs (CF_NONE, k, lval);
- }
- lval->ConstVal = lval2.ConstVal;
- lval->Flags = E_MEOFFS;
- }
+ /* Adjust the offset */
+ Expr->IVal += Subscript.IVal;
- /* Result is of element type */
- lval->Type = Indirect (tptr1);
+ } else {
- /* Done */
- goto end_array;
+ /* It's a pointer, so we do have to load it into the primary
+ * first (if it's not already there).
+ */
+ if (ConstBaseAddr || ED_IsLVal (Expr)) {
+ LoadExpr (CF_NONE, Expr);
+ ED_MakeRValExpr (Expr);
+ }
- } else if (IsClassPtr (tptr2 = lval2.Type)) {
- /* Subscript is pointer, get element type */
- lval2.Type = Indirect (tptr2);
+ /* Use the offset */
+ Expr->IVal = Subscript.IVal;
+ }
- /* Scale the rhs value in the primary register */
- g_scale (TypeOf (tptr1), CheckedSizeOf (lval2.Type));
- /* */
- lval->Type = lval2.Type;
- } else {
- Error ("Cannot subscript");
- }
+ } else {
- /* Add the subscript. Since arrays are indexed by integers,
- * we will ignore the true type of the subscript here and
- * use always an int.
- */
- g_inc (CF_INT | CF_CONST, lval2.ConstVal);
+ /* Scale the rhs value according to the element type */
+ 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!
+ */
+ g_inc (CF_INT | CF_CONST, Subscript.IVal);
+
+ }
} else {
/* Array subscript is not constant. Load it into the primary */
- Mark2 = GetCodePos ();
- exprhs (CF_NONE, l, &lval2);
-
- tptr2 = lval2.Type;
- if (IsClassPtr (tptr1)) {
+ GetCodePos (&Mark2);
+ LoadExpr (CF_NONE, &Subscript);
- /* Get the element type */
- lval->Type = Indirect (tptr1);
+ /* Do scaling */
+ if (IsClassPtr (Expr->Type)) {
- /* Indexing is based on int's, so we will just use the integer
+ /* 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).
*/
- g_scale (CF_INT, CheckedSizeOf (lval->Type));
+ g_scale (CF_INT, CheckedSizeOf (ElementType));
- } else if (IsClassPtr (tptr2)) {
-
- /* Get the element type */
- lval2.Type = Indirect (tptr2);
+ } else {
- /* Get the int value on top. If we go 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.
+ /* 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.
*/
if (ConstBaseAddr) {
- g_push (CF_INT, 0);
- exprhs (CF_NONE, k, lval);
- ConstBaseAddr = 0;
+ g_push (CF_INT, 0);
+ LoadExpr (CF_NONE, Expr);
+ ConstBaseAddr = 0;
} else {
g_swap (CF_INT);
}
/* Scale it */
- g_scale (TypeOf (tptr1), CheckedSizeOf (lval2.Type));
- lval->Type = lval2.Type;
- } else {
- Error ("Cannot subscript");
+ g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
+
}
- /* The offset is now in the primary register. It didn't have a
+ /* 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.
*/
- if (!ConstBaseAddr) {
- /* Add the subscript. Both values are int sized. */
+ if (!ConstBaseAddr) {
+
+ /* The array base address is on stack and the subscript is in the
+ * primary. Add both.
+ */
g_add (CF_INT, 0);
- } else {
- /* 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.
- */
- rflags = lval2.Flags & ~E_MCTYPE;
- ConstSubAddr = (rflags == E_MCONST) || /* Constant numeric address */
- (rflags & E_MGLOBAL) != 0 || /* Static array, or ... */
- rflags == E_MLOCAL; /* Local array */
+ } else {
- if (ConstSubAddr && CheckedSizeOf (lval->Type) == 1) {
+ /* 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.
+ */
+ if ((ED_IsLocConst (&Subscript) || ED_IsLocStack (&Subscript)) &&
+ CheckedSizeOf (ElementType) == SIZEOF_CHAR) {
- type* SavedType;
+ unsigned Flags;
- /* Reverse the order of evaluation */
- unsigned flags = (CheckedSizeOf (lval2.Type) == 1)? CF_CHAR : CF_INT;
- RemoveCode (Mark2);
+ /* Reverse the order of evaluation */
+ if (CheckedSizeOf (Subscript.Type) == SIZEOF_CHAR) {
+ Flags = CF_CHAR;
+ } else {
+ Flags = CF_INT;
+ }
+ RemoveCode (&Mark2);
- /* Get a pointer to the array into the primary. We have changed
- * Type above but we need the original type to load the
- * address, so restore it temporarily.
- */
- SavedType = lval->Type;
- lval->Type = tptr1;
- exprhs (CF_NONE, k, lval);
- lval->Type = SavedType;
-
- /* Add the variable */
- if (rflags == E_MLOCAL) {
- g_addlocal (flags, lval2.ConstVal);
- } else {
- flags |= GlobalModeFlags (lval2.Flags);
- g_addstatic (flags, lval2.Name, lval2.ConstVal);
- }
- } else {
- if (lflags == E_MCONST) {
- /* Constant numeric address. Just add it */
- g_inc (CF_INT | CF_UNSIGNED, lval->ConstVal);
- } else if (lflags == E_MLOCAL) {
- /* Base address is a local variable address */
- if (IsTypeArray (tptr1)) {
- g_addaddr_local (CF_INT, lval->ConstVal);
- } else {
- g_addlocal (CF_PTR, lval->ConstVal);
- }
+ /* Get a pointer to the array into the primary. */
+ LoadExpr (CF_NONE, Expr);
+
+ /* Add the variable */
+ if (ED_IsLocStack (&Subscript)) {
+ g_addlocal (Flags, Subscript.IVal);
+ } else {
+ Flags |= GlobalModeFlags (&Subscript);
+ g_addstatic (Flags, Subscript.Name, Subscript.IVal);
+ }
+ } else {
+
+ if (ED_IsLocAbs (Expr)) {
+ /* Constant numeric address. Just add it */
+ g_inc (CF_INT, Expr->IVal);
+ } else if (ED_IsLocStack (Expr)) {
+ /* Base address is a local variable address */
+ if (IsTypeArray (Expr->Type)) {
+ g_addaddr_local (CF_INT, Expr->IVal);
+ } else {
+ g_addlocal (CF_PTR, Expr->IVal);
+ }
} else {
/* Base address is a static variable address */
- unsigned flags = CF_INT;
- flags |= GlobalModeFlags (lval->Flags);
- if (IsTypeArray (tptr1)) {
- g_addaddr_static (flags, lval->Name, lval->ConstVal);
- } else {
- g_addstatic (flags, lval->Name, lval->ConstVal);
- }
+ unsigned Flags = CF_INT | GlobalModeFlags (Expr);
+ if (ED_IsRVal (Expr)) {
+ /* Add the address of the location */
+ g_addaddr_static (Flags, Expr->Name, Expr->IVal);
+ } else {
+ /* Add the contents of the location */
+ g_addstatic (Flags, Expr->Name, Expr->IVal);
+ }
}
}
+
+
}
+
+ /* The result is an expression in the primary */
+ ED_MakeRValExpr (Expr);
+
}
- lval->Flags = E_MEXPR;
-end_array:
- ConsumeRBrack ();
- return !IsTypeArray (lval->Type);
+ /* Result is of element type */
+ 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).
+ */
+ if (IsTypeArray (Expr->Type)) {
+ ED_MakeRVal (Expr);
+ } else {
+ ED_MakeLVal (Expr);
+ }
+
+ /* Consume the closing bracket */
+ ConsumeRBrack ();
}
-static int structref (int k, ExprDesc* lval)
+static void StructRef (ExprDesc* Expr)
/* Process struct field after . or ->. */
{
ident Ident;
SymEntry* Field;
- int flags;
+ TypeCode Q;
/* Skip the token and check for an identifier */
NextToken ();
if (CurTok.Tok != TOK_IDENT) {
Error ("Identifier expected");
- lval->Type = type_int;
- return 0;
+ /* Make the expression an integer at address zero */
+ ED_MakeConstAbs (Expr, 0, type_int);
+ return;
}
/* Get the symbol table entry and check for a struct field */
strcpy (Ident, CurTok.Ident);
NextToken ();
- Field = FindStructField (lval->Type, Ident);
+ Field = FindStructField (Expr->Type, Ident);
if (Field == 0) {
Error ("Struct/union has no field named `%s'", Ident);
- lval->Type = type_int;
- return 0;
+ /* Make the expression an integer at address zero */
+ ED_MakeConstAbs (Expr, 0, type_int);
+ return;
+ }
+
+ /* If we have a struct pointer that is an lvalue and not already in the
+ * primary, load it now.
+ */
+ if (ED_IsLVal (Expr) && IsTypePtr (Expr->Type)) {
+
+ /* Load into the primary */
+ LoadExpr (CF_NONE, Expr);
+
+ /* Make it an lvalue expression */
+ ED_MakeLValExpr (Expr);
}
- /* If we have constant input data, the result is also constant */
- flags = lval->Flags & ~E_MCTYPE;
- if (flags == E_MCONST ||
- (k == 0 && (flags == E_MLOCAL ||
- (flags & E_MGLOBAL) != 0 ||
- lval->Flags == E_MEOFFS))) {
- lval->ConstVal += Field->V.Offs;
+ /* Set the struct field offset */
+ Expr->IVal += Field->V.Offs;
+
+ /* The type is the type of the field plus any qualifiers from the struct */
+ if (IsClassStruct (Expr->Type)) {
+ Q = GetQualifier (Expr->Type);
} else {
- if ((flags & E_MEXPR) == 0 || k != 0) {
- exprhs (CF_NONE, k, lval);
- }
- lval->ConstVal = Field->V.Offs;
- lval->Flags = E_MEOFFS;
+ Q = GetQualifier (Indirect (Expr->Type));
+ }
+ if (GetQualifier (Field->Type) == (GetQualifier (Field->Type) | Q)) {
+ Expr->Type = Field->Type;
+ } else {
+ Expr->Type = TypeDup (Field->Type);
+ Expr->Type->C |= Q;
+ }
+
+ /* 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).
+ */
+ if (IsTypeArray (Expr->Type)) {
+ ED_MakeRVal (Expr);
+ } else {
+ ED_MakeLVal (Expr);
+ }
+
+ /* Make the expression a bit field if necessary */
+ if (SymIsBitField (Field)) {
+ ED_MakeBitField (Expr, Field->V.B.BitOffs, Field->V.B.BitWidth);
}
- lval->Type = Field->Type;
- return !IsTypeArray (Field->Type);
}
-static int hie11 (ExprDesc *lval)
+static void hie11 (ExprDesc *Expr)
/* Handle compound types (structs and arrays) */
{
- int k;
- type* tptr;
+ /* Name value used in invalid function calls */
+ static const char IllegalFunc[] = "illegal_function_call";
+
+ /* Evaluate the lhs */
+ Primary (Expr);
+
+ /* Check for a rhs */
+ while (CurTok.Tok == TOK_LBRACK || CurTok.Tok == TOK_LPAREN ||
+ CurTok.Tok == TOK_DOT || CurTok.Tok == TOK_PTR_REF) {
+
+ switch (CurTok.Tok) {
+
+ case TOK_LBRACK:
+ /* Array reference */
+ ArrayRef (Expr);
+ break;
+
+ case TOK_LPAREN:
+ /* Function call. */
+ if (!IsTypeFunc (Expr->Type) && !IsTypeFuncPtr (Expr->Type)) {
+ /* 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.
+ */
+ ED_MakeConstAbs (Expr, 0, GetImplicitFuncType ());
+ Expr->Name = (long) IllegalFunc;
+ }
+ /* Call the function */
+ FunctionCall (Expr);
+ break;
+
+ case TOK_DOT:
+ if (!IsClassStruct (Expr->Type)) {
+ Error ("Struct expected");
+ }
+ StructRef (Expr);
+ break;
+
+ case TOK_PTR_REF:
+ /* If we have an array, convert it to pointer to first element */
+ if (IsTypeArray (Expr->Type)) {
+ Expr->Type = ArrayToPtr (Expr->Type);
+ }
+ if (!IsClassPtr (Expr->Type) || !IsClassStruct (Indirect (Expr->Type))) {
+ Error ("Struct pointer expected");
+ }
+ StructRef (Expr);
+ break;
+
+ default:
+ Internal ("Invalid token in hie11: %d", CurTok.Tok);
-
- k = primary (lval);
- if (CurTok.Tok < TOK_LBRACK || CurTok.Tok > TOK_PTR_REF) {
- /* Not for us */
- return k;
+ }
}
+}
- while (1) {
- if (CurTok.Tok == TOK_LBRACK) {
- /* Array reference */
- k = arrayref (k, lval);
+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.
+ */
+{
+ unsigned Flags;
- } else if (CurTok.Tok == TOK_LPAREN) {
+ /* If StoreType was not given, use Expr->Type instead */
+ if (StoreType == 0) {
+ StoreType = Expr->Type;
+ }
- /* Function call. Skip the opening parenthesis */
- NextToken ();
- tptr = lval->Type;
- if (IsTypeFunc (lval->Type) || IsTypeFuncPtr (lval->Type)) {
+ /* Prepare the code generator flags */
+ Flags = TypeOf (StoreType) | GlobalModeFlags (Expr);
- /* Call the function */
- FunctionCall (k, lval);
+ /* Do the store depending on the location */
+ switch (ED_GetLoc (Expr)) {
- /* Result is in the primary register */
- lval->Flags = E_MEXPR;
+ case E_LOC_ABS:
+ /* Absolute: numeric address or const */
+ g_putstatic (Flags, Expr->IVal, 0);
+ break;
- /* Set to result */
- lval->Type = GetFuncReturn (lval->Type);
+ case E_LOC_GLOBAL:
+ /* Global variable */
+ g_putstatic (Flags, Expr->Name, Expr->IVal);
+ break;
- } else {
- Error ("Illegal function call");
- }
- k = 0;
+ case E_LOC_STATIC:
+ case E_LOC_LITERAL:
+ /* Static variable or literal in the literal pool */
+ g_putstatic (Flags, Expr->Name, Expr->IVal);
+ break;
- } else if (CurTok.Tok == TOK_DOT) {
+ case E_LOC_REGISTER:
+ /* Register variable */
+ g_putstatic (Flags, Expr->Name, Expr->IVal);
+ break;
- if (!IsClassStruct (lval->Type)) {
- Error ("Struct expected");
- }
- k = structref (0, lval);
+ case E_LOC_STACK:
+ /* Value on the stack */
+ g_putlocal (Flags, Expr->IVal, 0);
+ break;
- } else if (CurTok.Tok == TOK_PTR_REF) {
+ case E_LOC_PRIMARY:
+ /* The primary register (value is already there) */
+ break;
- tptr = lval->Type;
- if (tptr[0] != T_PTR || (tptr[1] & T_STRUCT) == 0) {
- Error ("Struct pointer expected");
- }
- k = structref (k, lval);
+ case E_LOC_EXPR:
+ /* An expression in the primary register */
+ g_putind (Flags, Expr->IVal);
+ break;
- } else {
- return k;
- }
+ default:
+ Internal ("Invalid location in Store(): 0x%04X", ED_GetLoc (Expr));
}
+
+ /* Assume that each one of the stores will invalidate CC */
+ ED_MarkAsUntested (Expr);
}
-static void store (ExprDesc* lval)
-/* Store primary reg into this reference */
+static void PreInc (ExprDesc* Expr)
+/* Handle the preincrement operators */
{
- int f;
- unsigned flags;
+ unsigned Flags;
+ unsigned long Val;
- f = lval->Flags;
- flags = TypeOf (lval->Type);
- if (f & E_MGLOBAL) {
- flags |= GlobalModeFlags (f);
- if (lval->Test) {
- /* Just testing */
- flags |= CF_TEST;
- }
+ /* Skip the operator token */
+ NextToken ();
+
+ /* Evaluate the expression and check that it is an lvalue */
+ hie10 (Expr);
+ if (!ED_IsLVal (Expr)) {
+ Error ("Invalid lvalue");
+ return;
+ }
- /* Generate code */
- g_putstatic (flags, lval->Name, lval->ConstVal);
+ /* We cannot modify const values */
+ if (IsQualConst (Expr->Type)) {
+ Error ("Increment of read-only variable");
+ }
- } else if (f & E_MLOCAL) {
- g_putlocal (flags, lval->ConstVal, 0);
- } else if (f == E_MEOFFS) {
- g_putind (flags, lval->ConstVal);
- } else if (f != E_MREG) {
- if (f & E_MEXPR) {
- g_putind (flags, 0);
- } else {
- /* Store into absolute address */
- g_putstatic (flags | CF_ABSOLUTE, lval->ConstVal, 0);
- }
+ /* Get the data type */
+ Flags = TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR | CF_CONST;
+
+ /* Get the increment value in bytes */
+ Val = IsTypePtr (Expr->Type)? CheckedPSizeOf (Expr->Type) : 1;
+
+ /* Check the location of the data */
+ switch (ED_GetLoc (Expr)) {
+
+ case E_LOC_ABS:
+ /* Absolute: numeric address or const */
+ g_addeqstatic (Flags, Expr->IVal, 0, Val);
+ break;
+
+ case E_LOC_GLOBAL:
+ /* Global variable */
+ g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
+ break;
+
+ case E_LOC_STATIC:
+ case E_LOC_LITERAL:
+ /* Static variable or literal in the literal pool */
+ g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
+ break;
+
+ case E_LOC_REGISTER:
+ /* Register variable */
+ g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
+ break;
+
+ case E_LOC_STACK:
+ /* Value on the stack */
+ g_addeqlocal (Flags, Expr->IVal, Val);
+ break;
+
+ case E_LOC_PRIMARY:
+ /* The primary register */
+ g_inc (Flags, Val);
+ break;
+
+ case E_LOC_EXPR:
+ /* An expression in the primary register */
+ g_addeqind (Flags, Expr->IVal, Val);
+ break;
+
+ default:
+ Internal ("Invalid location in PreInc(): 0x%04X", ED_GetLoc (Expr));
}
- /* Assume that each one of the stores will invalidate CC */
- lval->Test &= ~E_CC;
+ /* Result is an expression, no reference */
+ ED_MakeRValExpr (Expr);
}
-static void pre_incdec (ExprDesc* lval, void (*inc) (unsigned, unsigned long))
-/* Handle --i and ++i */
+static void PreDec (ExprDesc* Expr)
+/* Handle the predecrement operators */
{
- int k;
- unsigned flags;
- unsigned long val;
+ unsigned Flags;
+ unsigned long Val;
+ /* Skip the operator token */
NextToken ();
- if ((k = hie10 (lval)) == 0) {
- Error ("Invalid lvalue");
- return;
+
+ /* Evaluate the expression and check that it is an lvalue */
+ hie10 (Expr);
+ if (!ED_IsLVal (Expr)) {
+ Error ("Invalid lvalue");
+ return;
+ }
+
+ /* We cannot modify const values */
+ if (IsQualConst (Expr->Type)) {
+ Error ("Decrement of read-only variable");
}
/* Get the data type */
- flags = TypeOf (lval->Type) | CF_FORCECHAR | CF_CONST;
+ Flags = TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR | CF_CONST;
/* Get the increment value in bytes */
- val = (lval->Type [0] == T_PTR)? CheckedPSizeOf (lval->Type) : 1;
+ Val = IsTypePtr (Expr->Type)? CheckedPSizeOf (Expr->Type) : 1;
- /* We're currently only able to handle some adressing modes */
- if ((lval->Flags & E_MGLOBAL) == 0 && /* Global address? */
- (lval->Flags & E_MLOCAL) == 0 && /* Local address? */
- (lval->Flags & E_MCONST) == 0 && /* Constant address? */
- (lval->Flags & E_MEXPR) == 0) { /* Address in a/x? */
+ /* Check the location of the data */
+ switch (ED_GetLoc (Expr)) {
- /* Use generic code. Push the address if needed */
- PushAddr (lval);
+ case E_LOC_ABS:
+ /* Absolute: numeric address or const */
+ g_subeqstatic (Flags, Expr->IVal, 0, Val);
+ break;
- /* Fetch the value */
- exprhs (CF_NONE, k, lval);
+ case E_LOC_GLOBAL:
+ /* Global variable */
+ g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
+ break;
- /* Increment value in primary */
- inc (flags, val);
+ case E_LOC_STATIC:
+ case E_LOC_LITERAL:
+ /* Static variable or literal in the literal pool */
+ g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
+ break;
- /* Store the result back */
- store (lval);
+ case E_LOC_REGISTER:
+ /* Register variable */
+ g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
+ break;
- } else {
+ case E_LOC_STACK:
+ /* Value on the stack */
+ g_subeqlocal (Flags, Expr->IVal, Val);
+ break;
- /* Special code for some addressing modes - use the special += ops */
- if (lval->Flags & E_MGLOBAL) {
- flags |= GlobalModeFlags (lval->Flags);
- if (inc == g_inc) {
- g_addeqstatic (flags, lval->Name, lval->ConstVal, val);
- } else {
- g_subeqstatic (flags, lval->Name, lval->ConstVal, val);
- }
- } else if (lval->Flags & E_MLOCAL) {
- /* ref to localvar */
- if (inc == g_inc) {
- g_addeqlocal (flags, lval->ConstVal, val);
- } else {
- g_subeqlocal (flags, lval->ConstVal, val);
- }
- } else if (lval->Flags & E_MCONST) {
- /* ref to absolute address */
- flags |= CF_ABSOLUTE;
- if (inc == g_inc) {
- g_addeqstatic (flags, lval->ConstVal, 0, val);
- } else {
- g_subeqstatic (flags, lval->ConstVal, 0, val);
- }
- } else if (lval->Flags & E_MEXPR) {
- /* Address in a/x, check if we have an offset */
- unsigned Offs = (lval->Flags == E_MEOFFS)? lval->ConstVal : 0;
- if (inc == g_inc) {
- g_addeqind (flags, Offs, val);
- } else {
- g_subeqind (flags, Offs, val);
- }
- } else {
- Internal ("Invalid addressing mode");
- }
+ case E_LOC_PRIMARY:
+ /* The primary register */
+ g_inc (Flags, Val);
+ break;
+
+ case E_LOC_EXPR:
+ /* An expression in the primary register */
+ g_subeqind (Flags, Expr->IVal, Val);
+ break;
+ default:
+ Internal ("Invalid location in PreDec(): 0x%04X", ED_GetLoc (Expr));
}
- /* Result is an expression */
- lval->Flags = E_MEXPR;
+ /* Result is an expression, no reference */
+ ED_MakeRValExpr (Expr);
}
-static void post_incdec (ExprDesc *lval, int k, void (*inc) (unsigned, unsigned long))
-/* Handle i-- and i++ */
+static void PostInc (ExprDesc* Expr)
+/* Handle the postincrement operator */
{
- unsigned flags;
+ unsigned Flags;
NextToken ();
- if (k == 0) {
+
+ /* The expression to increment must be an lvalue */
+ if (!ED_IsLVal (Expr)) {
Error ("Invalid lvalue");
return;
}
+ /* We cannot modify const values */
+ if (IsQualConst (Expr->Type)) {
+ Error ("Increment of read-only variable");
+ }
+
/* Get the data type */
- flags = TypeOf (lval->Type);
+ Flags = TypeOf (Expr->Type);
/* Push the address if needed */
- PushAddr (lval);
+ PushAddr (Expr);
/* Fetch the value and save it (since it's the result of the expression) */
- exprhs (CF_NONE, 1, lval);
- g_save (flags | CF_FORCECHAR);
+ LoadExpr (CF_NONE, Expr);
+ g_save (Flags | CF_FORCECHAR);
/* If we have a pointer expression, increment by the size of the type */
- if (lval->Type[0] == T_PTR) {
- inc (flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (lval->Type + 1));
+ if (IsTypePtr (Expr->Type)) {
+ g_inc (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
- inc (flags | CF_CONST | CF_FORCECHAR, 1);
+ g_inc (Flags | CF_CONST | CF_FORCECHAR, 1);
}
/* Store the result back */
- store (lval);
+ Store (Expr, 0);
- /* Restore the original value */
- g_restore (flags | CF_FORCECHAR);
- lval->Flags = E_MEXPR;
+ /* Restore the original value in the primary register */
+ g_restore (Flags | CF_FORCECHAR);
+
+ /* The result is always an expression, no reference */
+ ED_MakeRValExpr (Expr);
}
-static void unaryop (int tok, ExprDesc* lval)
-/* Handle unary -/+ and ~ */
+static void PostDec (ExprDesc* Expr)
+/* Handle the postdecrement operator */
{
- int k;
- unsigned flags;
+ unsigned Flags;
NextToken ();
- k = hie10 (lval);
- if (k == 0 && (lval->Flags & E_MCONST) != 0) {
- /* Value is constant */
- switch (tok) {
- case TOK_MINUS: lval->ConstVal = -lval->ConstVal; break;
- case TOK_PLUS: break;
- case TOK_COMP: lval->ConstVal = ~lval->ConstVal; break;
- default: Internal ("Unexpected token: %d", tok);
- }
- } else {
- /* Value is not constant */
- exprhs (CF_NONE, k, lval);
- /* Get the type of the expression */
- flags = TypeOf (lval->Type);
-
- /* Handle the operation */
- switch (tok) {
- case TOK_MINUS: g_neg (flags); break;
- case TOK_PLUS: break;
- case TOK_COMP: g_com (flags); break;
- default: Internal ("Unexpected token: %d", tok);
- }
- lval->Flags = E_MEXPR;
+ /* The expression to increment must be an lvalue */
+ if (!ED_IsLVal (Expr)) {
+ Error ("Invalid lvalue");
+ return;
}
-}
-
-
-
-static int typecast (ExprDesc* lval)
-/* Handle an explicit cast */
-{
- int k;
- type Type[MAXTYPELEN];
- /* Skip the left paren */
- NextToken ();
+ /* We cannot modify const values */
+ if (IsQualConst (Expr->Type)) {
+ Error ("Decrement of read-only variable");
+ }
- /* Read the type */
- ParseType (Type);
+ /* Get the data type */
+ Flags = TypeOf (Expr->Type);
- /* Closing paren */
- ConsumeRParen ();
+ /* Push the address if needed */
+ PushAddr (Expr);
- /* Read the expression we have to cast */
- k = hie10 (lval);
+ /* Fetch the value and save it (since it's the result of the expression) */
+ LoadExpr (CF_NONE, Expr);
+ g_save (Flags | CF_FORCECHAR);
- /* If the expression is a function, treat it as pointer-to-function */
- if (IsTypeFunc (lval->Type)) {
- lval->Type = PointerTo (lval->Type);
+ /* If we have a pointer expression, increment by the size of the type */
+ if (IsTypePtr (Expr->Type)) {
+ g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
+ } else {
+ g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
}
- /* Check for a constant on the right side */
- if (k == 0 && lval->Flags == E_MCONST) {
-
- /* A cast of a constant to something else. If the new type is an int,
- * be sure to handle the size extension correctly. If the new type is
- * not an int, the cast is implementation specific anyway, so leave
- * the value alone.
- */
- if (IsClassInt (Type)) {
+ /* Store the result back */
+ Store (Expr, 0);
- /* Get the current and new size of the value */
- unsigned OldBits = CheckedSizeOf (lval->Type) * 8;
- unsigned NewBits = CheckedSizeOf (Type) * 8;
+ /* Restore the original value in the primary register */
+ g_restore (Flags | CF_FORCECHAR);
- /* Check if the new datatype will have a smaller range */
- if (NewBits <= OldBits) {
+ /* The result is always an expression, no reference */
+ ED_MakeRValExpr (Expr);
+}
- /* Cut the value to the new size */
- lval->ConstVal &= (0xFFFFFFFFUL >> (32 - NewBits));
- /* If the new type is signed, sign extend the value */
- if (!IsSignUnsigned (Type)) {
- lval->ConstVal |= ((~0L) << NewBits);
- }
- } else {
-
- /* Sign extend the value if needed */
- if (!IsSignUnsigned (lval->Type) && !IsSignUnsigned (Type)) {
- if (lval->ConstVal & (0x01UL << (OldBits-1))) {
- lval->ConstVal |= ((~0L) << OldBits);
- }
- }
- }
- }
+static void UnaryOp (ExprDesc* Expr)
+/* Handle unary -/+ and ~ */
+{
+ unsigned Flags;
- } else {
+ /* Remember the operator token and skip it */
+ token_t Tok = CurTok.Tok;
+ NextToken ();
- /* Not a constant. Be sure to ignore casts to void */
- if (!IsTypeVoid (Type)) {
+ /* Get the expression */
+ hie10 (Expr);
- /* If the size does not change, leave the value alone. Otherwise,
- * we have to load the value into the primary and generate code to
- * cast the value in the primary register.
- */
- if (SizeOf (Type) != SizeOf (lval->Type)) {
+ /* We can only handle integer types */
+ if (!IsClassInt (Expr->Type)) {
+ Error ("Argument must have integer type");
+ ED_MakeConstAbsInt (Expr, 1);
+ }
- /* Load the value into the primary */
- exprhs (CF_NONE, k, lval);
+ /* Check for a constant expression */
+ if (ED_IsConstAbs (Expr)) {
+ /* Value is constant */
+ switch (Tok) {
+ case TOK_MINUS: Expr->IVal = -Expr->IVal; break;
+ case TOK_PLUS: break;
+ case TOK_COMP: Expr->IVal = ~Expr->IVal; break;
+ default: Internal ("Unexpected token: %d", Tok);
+ }
+ } else {
+ /* Value is not constant */
+ LoadExpr (CF_NONE, Expr);
- /* Emit typecast code */
- g_typecast (TypeOf (Type), TypeOf (lval->Type));
+ /* Get the type of the expression */
+ Flags = TypeOf (Expr->Type);
- /* Value is now in primary */
- lval->Flags = E_MEXPR;
- k = 0;
- }
+ /* Handle the operation */
+ switch (Tok) {
+ case TOK_MINUS: g_neg (Flags); break;
+ case TOK_PLUS: break;
+ case TOK_COMP: g_com (Flags); break;
+ default: Internal ("Unexpected token: %d", Tok);
}
- }
-
- /* In any case, use the new type */
- lval->Type = TypeDup (Type);
- /* Done */
- return k;
+ /* The result is a rvalue in the primary */
+ ED_MakeRValExpr (Expr);
+ }
}
-static int hie10 (ExprDesc* lval)
+void hie10 (ExprDesc* Expr)
/* Handle ++, --, !, unary - etc. */
{
- int k;
- type* t;
+ unsigned long Size;
switch (CurTok.Tok) {
case TOK_INC:
- pre_incdec (lval, g_inc);
- return 0;
+ PreInc (Expr);
+ break;
case TOK_DEC:
- pre_incdec (lval, g_dec);
- return 0;
+ PreDec (Expr);
+ break;
case TOK_PLUS:
case TOK_MINUS:
case TOK_COMP:
- unaryop (CurTok.Tok, lval);
- return 0;
+ UnaryOp (Expr);
+ break;
case TOK_BOOL_NOT:
NextToken ();
- if (evalexpr (CF_NONE, hie10, lval) == 0) {
- /* Constant expression */
- lval->ConstVal = !lval->ConstVal;
+ if (evalexpr (CF_NONE, hie10, Expr) == 0) {
+ /* Constant expression */
+ Expr->IVal = !Expr->IVal;
} else {
- g_bneg (TypeOf (lval->Type));
- lval->Test |= E_CC; /* bneg will set cc */
- lval->Flags = E_MEXPR; /* say it's an expr */
+ g_bneg (TypeOf (Expr->Type));
+ ED_MakeRValExpr (Expr);
+ ED_TestDone (Expr); /* bneg will set cc */
}
- return 0; /* expr not storable */
+ break;
case TOK_STAR:
NextToken ();
- if (evalexpr (CF_NONE, hie10, lval) != 0) {
- /* Expression is not const, indirect value loaded into primary */
- lval->Flags = E_MEXPR;
- lval->ConstVal = 0; /* Offset is zero now */
- }
- t = lval->Type;
- if (IsClassPtr (t)) {
- lval->Type = Indirect (t);
- } else {
- Error ("Illegal indirection");
- }
- return 1;
+ 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.
+ */
+ 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".
+ */
+ if (IsTypeFuncPtr (Expr->Type) || IsTypeFunc (Expr->Type)) {
+ /* Expression not storable */
+ ED_MakeRVal (Expr);
+ } else {
+ if (IsClassPtr (Expr->Type)) {
+ Expr->Type = Indirect (Expr->Type);
+ } else {
+ Error ("Illegal indirection");
+ }
+ /* The * operator yields an lvalue */
+ ED_MakeLVal (Expr);
+ }
+ break;
case TOK_AND:
NextToken ();
- k = hie10 (lval);
+ ExprWithCheck (hie10, Expr);
/* The & operator may be applied to any lvalue, and it may be
* applied to functions, even if they're no lvalues.
*/
- if (k == 0 && !IsTypeFunc (lval->Type)) {
- /* Allow the & operator with an array */
- if (!IsTypeArray (lval->Type)) {
- Error ("Illegal address");
- }
- } else {
- t = TypeAlloc (TypeLen (lval->Type) + 2);
- t [0] = T_PTR;
- TypeCpy (t + 1, lval->Type);
- lval->Type = t;
+ if (ED_IsRVal (Expr) && !IsTypeFunc (Expr->Type) && !IsTypeArray (Expr->Type)) {
+ Error ("Illegal address");
+ } else {
+ if (ED_IsBitField (Expr)) {
+ Error ("Cannot take address of bit-field");
+ /* Do it anyway, just to avoid further warnings */
+ Expr->Flags &= ~E_BITFIELD;
+ }
+ Expr->Type = PointerTo (Expr->Type);
+ /* The & operator yields an rvalue */
+ ED_MakeRVal (Expr);
}
- return 0;
+ break;
case TOK_SIZEOF:
NextToken ();
- if (istypeexpr ()) {
- type Type[MAXTYPELEN];
- NextToken ();
- lval->ConstVal = CheckedSizeOf (ParseType (Type));
- ConsumeRParen ();
+ if (TypeSpecAhead ()) {
+ Type T[MAXTYPELEN];
+ NextToken ();
+ Size = CheckedSizeOf (ParseType (T));
+ ConsumeRParen ();
} else {
- /* Remember the output queue pointer */
- CodeMark Mark = GetCodePos ();
- hie10 (lval);
- lval->ConstVal = CheckedSizeOf (lval->Type);
- /* Remove any generated code */
- RemoveCode (Mark);
+ /* Remember the output queue pointer */
+ CodeMark Mark;
+ GetCodePos (&Mark);
+ hie10 (Expr);
+ Size = CheckedSizeOf (Expr->Type);
+ /* Remove any generated code */
+ RemoveCode (&Mark);
}
- lval->Flags = E_MCONST | E_TCONST;
- lval->Type = type_uint;
- lval->Test &= ~E_CC;
- return 0;
+ ED_MakeConstAbs (Expr, Size, type_size_t);
+ ED_MarkAsUntested (Expr);
+ break;
default:
- if (istypeexpr ()) {
- /* A cast */
- return typecast (lval);
- }
- }
+ if (TypeSpecAhead ()) {
- k = hie11 (lval);
- switch (CurTok.Tok) {
- case TOK_INC:
- post_incdec (lval, k, g_inc);
- return 0;
+ /* A typecast */
+ TypeCast (Expr);
- case TOK_DEC:
- post_incdec (lval, k, g_dec);
- return 0;
+ } else {
+
+ /* An expression */
+ hie11 (Expr);
+
+ /* Handle post increment */
+ switch (CurTok.Tok) {
+ case TOK_INC: PostInc (Expr); break;
+ case TOK_DEC: PostDec (Expr); break;
+ default: break;
+ }
- default:
- return k;
+ }
+ break;
}
}
-static int hie_internal (const GenDesc** ops, /* List of generators */
- ExprDesc* lval, /* parent expr's lval */
- int (*hienext) (ExprDesc*),
- int* UsedGen) /* next higher level */
+static void hie_internal (const GenDesc* Ops, /* List of generators */
+ ExprDesc* Expr,
+ void (*hienext) (ExprDesc*),
+ int* UsedGen)
/* Helper function */
{
- int k;
- ExprDesc lval2;
+ ExprDesc Expr2;
CodeMark Mark1;
CodeMark Mark2;
const GenDesc* Gen;
- token_t tok; /* The operator token */
+ token_t Tok; /* The operator token */
unsigned ltype, type;
int rconst; /* Operand is a constant */
- k = hienext (lval);
+ hienext (Expr);
*UsedGen = 0;
- while ((Gen = FindGen (CurTok.Tok, ops)) != 0) {
+ while ((Gen = FindGen (CurTok.Tok, Ops)) != 0) {
/* Tell the caller that we handled it's ops */
- *UsedGen = 1;
+ *UsedGen = 1;
/* All operators that call this function expect an int on the lhs */
- if (!IsClassInt (lval->Type)) {
+ if (!IsClassInt (Expr->Type)) {
Error ("Integer expression expected");
+ /* To avoid further errors, make Expr a valid int expression */
+ ED_MakeConstAbsInt (Expr, 1);
}
/* Remember the operator token, then skip it */
- tok = CurTok.Tok;
+ Tok = CurTok.Tok;
NextToken ();
/* Get the lhs on stack */
- Mark1 = GetCodePos ();
- ltype = TypeOf (lval->Type);
- if (k == 0 && lval->Flags == E_MCONST) {
+ GetCodePos (&Mark1);
+ ltype = TypeOf (Expr->Type);
+ if (ED_IsConstAbs (Expr)) {
/* Constant value */
- Mark2 = GetCodePos ();
- g_push (ltype | CF_CONST, lval->ConstVal);
+ GetCodePos (&Mark2);
+ g_push (ltype | CF_CONST, Expr->IVal);
} else {
/* Value not constant */
- exprhs (CF_NONE, k, lval);
- Mark2 = GetCodePos ();
+ LoadExpr (CF_NONE, Expr);
+ GetCodePos (&Mark2);
g_push (ltype, 0);
}
/* Get the right hand side */
- rconst = (evalexpr (CF_NONE, hienext, &lval2) == 0);
+ MarkedExprWithCheck (hienext, &Expr2);
+
+ /* Check for a constant expression */
+ rconst = (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2));
+ if (!rconst) {
+ /* Not constant, load into the primary */
+ LoadExpr (CF_NONE, &Expr2);
+ }
/* Check the type of the rhs */
- if (!IsClassInt (lval2.Type)) {
+ if (!IsClassInt (Expr2.Type)) {
Error ("Integer expression expected");
}
/* Check for const operands */
- if (k == 0 && lval->Flags == E_MCONST && rconst) {
+ if (ED_IsConstAbs (Expr) && rconst) {
/* Both operands are constant, remove the generated code */
- RemoveCode (Mark1);
- pop (ltype);
-
- /* Evaluate the result */
- lval->ConstVal = kcalc (tok, lval->ConstVal, lval2.ConstVal);
+ RemoveCode (&Mark1);
/* Get the type of the result */
- lval->Type = promoteint (lval->Type, lval2.Type);
+ Expr->Type = promoteint (Expr->Type, Expr2.Type);
+
+ /* Handle the op differently for signed and unsigned types */
+ if (IsSignSigned (Expr->Type)) {
+
+ /* Evaluate the result for signed operands */
+ signed long Val1 = Expr->IVal;
+ signed long Val2 = Expr2.IVal;
+ switch (Tok) {
+ case TOK_OR:
+ Expr->IVal = (Val1 | Val2);
+ break;
+ case TOK_XOR:
+ Expr->IVal = (Val1 ^ Val2);
+ break;
+ case TOK_AND:
+ Expr->IVal = (Val1 & Val2);
+ break;
+ case TOK_STAR:
+ Expr->IVal = (Val1 * Val2);
+ break;
+ case TOK_DIV:
+ if (Val2 == 0) {
+ Error ("Division by zero");
+ Expr->IVal = 0x7FFFFFFF;
+ } else {
+ Expr->IVal = (Val1 / Val2);
+ }
+ break;
+ case TOK_MOD:
+ if (Val2 == 0) {
+ Error ("Modulo operation with zero");
+ Expr->IVal = 0;
+ } else {
+ Expr->IVal = (Val1 % Val2);
+ }
+ break;
+ default:
+ Internal ("hie_internal: got token 0x%X\n", Tok);
+ }
+ } else {
+
+ /* Evaluate the result for unsigned operands */
+ unsigned long Val1 = Expr->IVal;
+ unsigned long Val2 = Expr2.IVal;
+ switch (Tok) {
+ case TOK_OR:
+ Expr->IVal = (Val1 | Val2);
+ break;
+ case TOK_XOR:
+ Expr->IVal = (Val1 ^ Val2);
+ break;
+ case TOK_AND:
+ Expr->IVal = (Val1 & Val2);
+ break;
+ case TOK_STAR:
+ Expr->IVal = (Val1 * Val2);
+ break;
+ case TOK_DIV:
+ if (Val2 == 0) {
+ Error ("Division by zero");
+ Expr->IVal = 0xFFFFFFFF;
+ } else {
+ Expr->IVal = (Val1 / Val2);
+ }
+ break;
+ case TOK_MOD:
+ if (Val2 == 0) {
+ Error ("Modulo operation with zero");
+ Expr->IVal = 0;
+ } else {
+ Expr->IVal = (Val1 % Val2);
+ }
+ break;
+ default:
+ Internal ("hie_internal: got token 0x%X\n", Tok);
+ }
+ }
} else {
* expects the lhs in the primary, remove the push of the primary
* now.
*/
- unsigned rtype = TypeOf (lval2.Type);
+ unsigned rtype = TypeOf (Expr2.Type);
type = 0;
if (rconst) {
/* Second value is constant - check for div */
type |= CF_CONST;
- rtype |= CF_CONST;
- if (tok == TOK_DIV && lval2.ConstVal == 0) {
+ rtype |= CF_CONST;
+ if (Tok == TOK_DIV && Expr2.IVal == 0) {
Error ("Division by zero");
- } else if (tok == TOK_MOD && lval2.ConstVal == 0) {
+ } else if (Tok == TOK_MOD && Expr2.IVal == 0) {
Error ("Modulo operation with zero");
}
- if ((Gen->Flags & GEN_NOPUSH) != 0) {
- RemoveCode (Mark2);
- pop (ltype);
- ltype |= CF_REG; /* Value is in register */
- }
+ if ((Gen->Flags & GEN_NOPUSH) != 0) {
+ RemoveCode (&Mark2);
+ ltype |= CF_REG; /* Value is in register */
+ }
}
/* Determine the type of the operation result. */
type |= g_typeadjust (ltype, rtype);
- lval->Type = promoteint (lval->Type, lval2.Type);
+ Expr->Type = promoteint (Expr->Type, Expr2.Type);
/* Generate code */
- Gen->Func (type, lval2.ConstVal);
- lval->Flags = E_MEXPR;
- }
+ Gen->Func (type, Expr2.IVal);
- /* We have a rvalue now */
- k = 0;
+ /* We have a rvalue in the primary now */
+ ED_MakeRValExpr (Expr);
+ }
}
-
- return k;
}
-static int hie_compare (const GenDesc** ops, /* List of generators */
- ExprDesc* lval, /* parent expr's lval */
- int (*hienext) (ExprDesc*))
+static void hie_compare (const GenDesc* Ops, /* List of generators */
+ ExprDesc* Expr,
+ void (*hienext) (ExprDesc*))
/* Helper function for the compare operators */
{
- int k;
- ExprDesc lval2;
+ ExprDesc Expr2;
CodeMark Mark1;
CodeMark Mark2;
const GenDesc* Gen;
- token_t tok; /* The operator token */
+ token_t Tok; /* The operator token */
unsigned ltype;
int rconst; /* Operand is a constant */
- k = hienext (lval);
+ hienext (Expr);
- while ((Gen = FindGen (CurTok.Tok, ops)) != 0) {
+ while ((Gen = FindGen (CurTok.Tok, Ops)) != 0) {
- /* Remember the operator token, then skip it */
- tok = CurTok.Tok;
- NextToken ();
+ /* Remember the operator token, then skip it */
+ Tok = CurTok.Tok;
+ NextToken ();
- /* Get the lhs on stack */
- Mark1 = GetCodePos ();
- ltype = TypeOf (lval->Type);
- if (k == 0 && lval->Flags == E_MCONST) {
- /* Constant value */
- Mark2 = GetCodePos ();
- g_push (ltype | CF_CONST, lval->ConstVal);
- } else {
- /* Value not constant */
- exprhs (CF_NONE, k, lval);
- Mark2 = GetCodePos ();
- g_push (ltype, 0);
+ /* Get the lhs on stack */
+ GetCodePos (&Mark1);
+ ltype = TypeOf (Expr->Type);
+ if (ED_IsConstAbs (Expr)) {
+ /* Constant value */
+ GetCodePos (&Mark2);
+ g_push (ltype | CF_CONST, Expr->IVal);
+ } else {
+ /* Value not constant */
+ LoadExpr (CF_NONE, Expr);
+ GetCodePos (&Mark2);
+ g_push (ltype, 0);
}
/* Get the right hand side */
- rconst = (evalexpr (CF_NONE, hienext, &lval2) == 0);
+ MarkedExprWithCheck (hienext, &Expr2);
+
+ /* Check for a constant expression */
+ rconst = (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2));
+ if (!rconst) {
+ /* Not constant, load into the primary */
+ LoadExpr (CF_NONE, &Expr2);
+ }
/* Make sure, the types are compatible */
- if (IsClassInt (lval->Type)) {
- if (!IsClassInt (lval2.Type) && !(IsClassPtr(lval2.Type) && IsNullPtr(lval))) {
- Error ("Incompatible types");
+ if (IsClassInt (Expr->Type)) {
+ if (!IsClassInt (Expr2.Type) && !(IsClassPtr(Expr2.Type) && ED_IsNullPtr(Expr))) {
+ Error ("Incompatible types");
}
- } else if (IsClassPtr (lval->Type)) {
- if (IsClassPtr (lval2.Type)) {
- /* Both pointers are allowed in comparison if they point to
- * the same type, or if one of them is a void pointer.
+ } 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.
*/
- type* left = Indirect (lval->Type);
- type* right = Indirect (lval2.Type);
- if (TypeCmp (left, right) < TC_EQUAL && *left != T_VOID && *right != T_VOID) {
- /* Incomatible pointers */
- Error ("Incompatible types");
- }
- } else if (!IsNullPtr (&lval2)) {
- Error ("Incompatible types");
+ Type* left = Indirect (Expr->Type);
+ Type* right = Indirect (Expr2.Type);
+ if (TypeCmp (left, right) < TC_EQUAL && left->C != T_VOID && right->C != T_VOID) {
+ /* Incomatible pointers */
+ Error ("Incompatible types");
+ }
+ } else if (!ED_IsNullPtr (&Expr2)) {
+ Error ("Incompatible types");
}
}
/* Check for const operands */
- if (k == 0 && lval->Flags == E_MCONST && rconst) {
-
- /* Both operands are constant, remove the generated code */
- RemoveCode (Mark1);
- pop (ltype);
-
- /* Evaluate the result */
- lval->ConstVal = kcalc (tok, lval->ConstVal, lval2.ConstVal);
+ if (ED_IsConstAbs (Expr) && rconst) {
+
+ /* If the result is constant, this is suspicious when not in
+ * preprocessor mode.
+ */
+ if (!Preprocessing) {
+ Warning ("Result of comparison is constant");
+ }
+
+ /* Both operands are constant, remove the generated code */
+ RemoveCode (&Mark1);
+
+ /* Determine if this is a signed or unsigned compare */
+ if (IsClassInt (Expr->Type) && IsSignSigned (Expr->Type) &&
+ IsClassInt (Expr2.Type) && IsSignSigned (Expr2.Type)) {
+
+ /* Evaluate the result for signed operands */
+ signed long Val1 = Expr->IVal;
+ signed long Val2 = Expr2.IVal;
+ switch (Tok) {
+ case TOK_EQ: Expr->IVal = (Val1 == Val2); break;
+ case TOK_NE: Expr->IVal = (Val1 != Val2); break;
+ case TOK_LT: Expr->IVal = (Val1 < Val2); break;
+ case TOK_LE: Expr->IVal = (Val1 <= Val2); break;
+ case TOK_GE: Expr->IVal = (Val1 >= Val2); break;
+ case TOK_GT: Expr->IVal = (Val1 > Val2); break;
+ default: Internal ("hie_compare: got token 0x%X\n", Tok);
+ }
+
+ } else {
+
+ /* Evaluate the result for unsigned operands */
+ unsigned long Val1 = Expr->IVal;
+ unsigned long Val2 = Expr2.IVal;
+ switch (Tok) {
+ case TOK_EQ: Expr->IVal = (Val1 == Val2); break;
+ case TOK_NE: Expr->IVal = (Val1 != Val2); break;
+ case TOK_LT: Expr->IVal = (Val1 < Val2); break;
+ case TOK_LE: Expr->IVal = (Val1 <= Val2); break;
+ case TOK_GE: Expr->IVal = (Val1 >= Val2); break;
+ case TOK_GT: Expr->IVal = (Val1 > Val2); break;
+ default: Internal ("hie_compare: got token 0x%X\n", Tok);
+ }
+ }
} else {
if (rconst) {
flags |= CF_CONST;
if ((Gen->Flags & GEN_NOPUSH) != 0) {
- RemoveCode (Mark2);
- pop (ltype);
+ RemoveCode (&Mark2);
ltype |= CF_REG; /* Value is in register */
}
}
* operation as char operation. Otherwise the default
* promotions are used.
*/
- if (IsTypeChar (lval->Type) && (IsTypeChar (lval2.Type) || rconst)) {
+ if (IsTypeChar (Expr->Type) && (IsTypeChar (Expr2.Type) || rconst)) {
flags |= CF_CHAR;
- if (IsSignUnsigned (lval->Type) || IsSignUnsigned (lval2.Type)) {
+ if (IsSignUnsigned (Expr->Type) || IsSignUnsigned (Expr2.Type)) {
flags |= CF_UNSIGNED;
}
if (rconst) {
flags |= CF_FORCECHAR;
}
} else {
- unsigned rtype = TypeOf (lval2.Type) | (flags & CF_CONST);
+ unsigned rtype = TypeOf (Expr2.Type) | (flags & CF_CONST);
flags |= g_typeadjust (ltype, rtype);
}
/* Generate code */
- Gen->Func (flags, lval2.ConstVal);
- lval->Flags = E_MEXPR;
+ Gen->Func (flags, Expr2.IVal);
+
+ /* The result is an rvalue in the primary */
+ ED_MakeRValExpr (Expr);
}
/* Result type is always int */
- lval->Type = type_int;
+ Expr->Type = type_int;
- /* We have a rvalue now, condition codes are set */
- k = 0;
- lval->Test |= E_CC;
+ /* Condition codes are set */
+ ED_TestDone (Expr);
}
-
- return k;
}
-static int hie9 (ExprDesc *lval)
+static void hie9 (ExprDesc *Expr)
/* Process * and / operators. */
{
- static const GenDesc* hie9_ops [] = {
- &GenMUL, &GenDIV, &GenMOD, 0
+ static const GenDesc hie9_ops[] = {
+ { TOK_STAR, GEN_NOPUSH, g_mul },
+ { TOK_DIV, GEN_NOPUSH, g_div },
+ { TOK_MOD, GEN_NOPUSH, g_mod },
+ { TOK_INVALID, 0, 0 }
};
int UsedGen;
- return hie_internal (hie9_ops, lval, hie10, &UsedGen);
+ hie_internal (hie9_ops, Expr, hie10, &UsedGen);
}
-static void parseadd (int k, ExprDesc* lval)
-/* Parse an expression with the binary plus operator. lval contains the
+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.
*/
{
- ExprDesc lval2;
- unsigned flags; /* Operation flags */
- CodeMark Mark; /* Remember code position */
- type* lhst; /* Type of left hand side */
- type* rhst; /* Type of right hand side */
+ ExprDesc Expr2;
+ unsigned flags; /* Operation flags */
+ CodeMark Mark; /* Remember code position */
+ Type* lhst; /* Type of left hand side */
+ Type* rhst; /* Type of right hand side */
/* Skip the PLUS token */
NextToken ();
/* Get the left hand side type, initialize operation flags */
- lhst = lval->Type;
+ lhst = Expr->Type;
flags = 0;
/* Check for constness on both sides */
- if (k == 0 && (lval->Flags & E_MCONST) != 0) {
+ if (ED_IsConst (Expr)) {
- /* The left hand side is a constant. Good. Get rhs */
- k = hie9 (&lval2);
- if (k == 0 && lval2.Flags == E_MCONST) {
+ /* The left hand side is a constant of some sort. Good. Get rhs */
+ hie9 (&Expr2);
+ if (ED_IsConstAbs (&Expr2)) {
- /* Right hand side is also constant. Get the rhs type */
- rhst = lval2.Type;
+ /* Right hand side is a constant numeric value. Get the rhs type */
+ rhst = Expr2.Type;
/* Both expressions are constants. Check for pointer arithmetic */
if (IsClassPtr (lhst) && IsClassInt (rhst)) {
- /* Left is pointer, right is int, must scale rhs */
- lval->ConstVal += lval2.ConstVal * CheckedPSizeOf (lhst);
- /* Result type is a pointer */
+ /* Left is pointer, right is int, must scale rhs */
+ Expr->IVal += Expr2.IVal * CheckedPSizeOf (lhst);
+ /* Result type is a pointer */
} else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
- /* Left is int, right is pointer, must scale lhs */
- lval->ConstVal = lval->ConstVal * CheckedPSizeOf (rhst) + lval2.ConstVal;
- /* Result type is a pointer */
- lval->Type = lval2.Type;
+ /* Left is int, right is pointer, must scale lhs */
+ Expr->IVal = Expr->IVal * CheckedPSizeOf (rhst) + Expr2.IVal;
+ /* Result type is a pointer */
+ Expr->Type = Expr2.Type;
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
- /* Integer addition */
- lval->ConstVal += lval2.ConstVal;
- typeadjust (lval, &lval2, 1);
+ /* Integer addition */
+ Expr->IVal += Expr2.IVal;
+ typeadjust (Expr, &Expr2, 1);
} else {
/* OOPS */
- Error ("Invalid operands for binary operator `+'");
+ Error ("Invalid operands for binary operator `+'");
}
- /* Result is constant, condition codes not set */
- lval->Test &= ~E_CC;
-
- } else {
+ } else {
/* lhs is a constant and rhs is not constant. Load rhs into
* the primary.
*/
- exprhs (CF_NONE, k, &lval2);
+ LoadExpr (CF_NONE, &Expr2);
/* Beware: The check above (for lhs) lets not only pass numeric
* constants, but also constant addresses (labels), maybe even
*/
/* First, get the rhs type. */
- rhst = lval2.Type;
+ rhst = Expr2.Type;
/* Setup flags */
- if (lval->Flags == E_MCONST) {
+ if (ED_IsLocAbs (Expr)) {
/* A numerical constant */
flags |= CF_CONST;
} else {
/* Constant address label */
- flags |= GlobalModeFlags (lval->Flags) | CF_CONSTADDR;
+ flags |= GlobalModeFlags (Expr) | CF_CONSTADDR;
}
/* Check for pointer arithmetic */
g_scale (CF_INT, CheckedPSizeOf (lhst));
/* Operate on pointers, result type is a pointer */
flags |= CF_PTR;
- /* Generate the code for the add */
- if (lval->Flags == E_MCONST) {
- /* Numeric constant */
- g_inc (flags, lval->ConstVal);
- } else {
- /* Constant address */
- g_addaddr_static (flags, lval->Name, lval->ConstVal);
- }
+ /* Generate the code for the add */
+ if (ED_GetLoc (Expr) == E_LOC_ABS) {
+ /* Numeric constant */
+ g_inc (flags, Expr->IVal);
+ } else {
+ /* Constant address */
+ g_addaddr_static (flags, Expr->Name, Expr->IVal);
+ }
} else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
/* Left is int, right is pointer, must scale lhs. */
- unsigned ScaleFactor = CheckedPSizeOf (rhst);
+ unsigned ScaleFactor = CheckedPSizeOf (rhst);
/* Operate on pointers, result type is a pointer */
- flags |= CF_PTR;
- lval->Type = lval2.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.
- */
- if (lval->Flags == E_MCONST) {
- /* Numeric constant, scale lhs */
- lval->ConstVal *= ScaleFactor;
- /* Generate the code for the add */
- g_inc (flags, lval->ConstVal);
- } else if (ScaleFactor == 1) {
- /* Constant address but no need to scale */
- g_addaddr_static (flags, lval->Name, lval->ConstVal);
- } else {
- /* Constant address that must be scaled */
- g_push (TypeOf (lval2.Type), 0); /* rhs --> stack */
- g_getimmed (flags, lval->Name, lval->ConstVal);
- g_scale (CF_PTR, ScaleFactor);
- g_add (CF_PTR, 0);
- }
+ flags |= CF_PTR;
+ 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.
+ */
+ if (ED_IsLocAbs (Expr)) {
+ /* Numeric constant, scale lhs */
+ Expr->IVal *= ScaleFactor;
+ /* Generate the code for the add */
+ g_inc (flags, Expr->IVal);
+ } else if (ScaleFactor == 1) {
+ /* Constant address but no need to scale */
+ g_addaddr_static (flags, Expr->Name, Expr->IVal);
+ } else {
+ /* Constant address that must be scaled */
+ g_push (TypeOf (Expr2.Type), 0); /* rhs --> stack */
+ g_getimmed (flags, Expr->Name, Expr->IVal);
+ g_scale (CF_PTR, ScaleFactor);
+ g_add (CF_PTR, 0);
+ }
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
/* Integer addition */
- flags |= typeadjust (lval, &lval2, 1);
- /* Generate the code for the add */
- if (lval->Flags == E_MCONST) {
- /* Numeric constant */
- g_inc (flags, lval->ConstVal);
- } else {
- /* Constant address */
- g_addaddr_static (flags, lval->Name, lval->ConstVal);
- }
+ flags |= typeadjust (Expr, &Expr2, 1);
+ /* Generate the code for the add */
+ if (ED_IsLocAbs (Expr)) {
+ /* Numeric constant */
+ g_inc (flags, Expr->IVal);
+ } else {
+ /* Constant address */
+ g_addaddr_static (flags, Expr->Name, Expr->IVal);
+ }
} else {
/* OOPS */
Error ("Invalid operands for binary operator `+'");
+ flags = CF_INT;
}
- /* Result is in primary register */
- lval->Flags = E_MEXPR;
- lval->Test &= ~E_CC;
-
+ /* Result is a rvalue in primary register */
+ ED_MakeRValExpr (Expr);
}
} else {
/* Left hand side is not constant. Get the value onto the stack. */
- exprhs (CF_NONE, k, lval); /* --> primary register */
- Mark = GetCodePos ();
- g_push (TypeOf (lval->Type), 0); /* --> stack */
+ LoadExpr (CF_NONE, Expr); /* --> primary register */
+ GetCodePos (&Mark);
+ g_push (TypeOf (Expr->Type), 0); /* --> stack */
/* Evaluate the rhs */
- if (evalexpr (CF_NONE, hie9, &lval2) == 0) {
+ MarkedExprWithCheck (hie9, &Expr2);
+
+ /* Check for a constant rhs expression */
+ if (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2)) {
/* Right hand side is a constant. Get the rhs type */
- rhst = lval2.Type;
+ rhst = Expr2.Type;
/* Remove pushed value from stack */
- RemoveCode (Mark);
- pop (TypeOf (lval->Type));
+ RemoveCode (&Mark);
/* Check for pointer arithmetic */
if (IsClassPtr (lhst) && IsClassInt (rhst)) {
/* Left is pointer, right is int, must scale rhs */
- lval2.ConstVal *= CheckedPSizeOf (lhst);
+ Expr2.IVal *= CheckedPSizeOf (lhst);
/* Operate on pointers, result type is a pointer */
flags = CF_PTR;
} else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
g_scale (CF_INT | CF_CONST, CheckedPSizeOf (rhst));
/* Operate on pointers, result type is a pointer */
flags = CF_PTR;
- lval->Type = lval2.Type;
+ Expr->Type = Expr2.Type;
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
/* Integer addition */
- flags = typeadjust (lval, &lval2, 1);
+ flags = typeadjust (Expr, &Expr2, 1);
} else {
/* OOPS */
Error ("Invalid operands for binary operator `+'");
+ flags = CF_INT;
}
/* Generate code for the add */
- g_inc (flags | CF_CONST, lval2.ConstVal);
-
- /* Result is in primary register */
- lval->Flags = E_MEXPR;
- lval->Test &= ~E_CC;
+ g_inc (flags | CF_CONST, Expr2.IVal);
} else {
+ /* Not constant, load into the primary */
+ LoadExpr (CF_NONE, &Expr2);
+
/* lhs and rhs are not constant. Get the rhs type. */
- rhst = lval2.Type;
+ rhst = Expr2.Type;
/* Check for pointer arithmetic */
if (IsClassPtr (lhst) && IsClassInt (rhst)) {
} else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
/* Left is int, right is pointer, must scale lhs */
g_tosint (TypeOf (rhst)); /* Make sure, TOS is int */
- g_swap (CF_INT); /* Swap TOS and primary */
+ g_swap (CF_INT); /* Swap TOS and primary */
g_scale (CF_INT, CheckedPSizeOf (rhst));
/* Operate on pointers, result type is a pointer */
flags = CF_PTR;
- lval->Type = lval2.Type;
+ Expr->Type = Expr2.Type;
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
- /* Integer addition */
- flags = typeadjust (lval, &lval2, 0);
+ /* 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.
+ */
+ flags = typeadjust (Expr, &Expr2, 0) & ~CF_CONST;
} else {
/* OOPS */
- Error ("Invalid operands for binary operator `+'");
+ Error ("Invalid operands for binary operator `+'");
+ flags = CF_INT;
}
/* Generate code for the add */
g_add (flags, 0);
- /* Result is in primary register */
- lval->Flags = E_MEXPR;
- lval->Test &= ~E_CC;
-
}
+ /* Result is a rvalue in primary register */
+ ED_MakeRValExpr (Expr);
}
+
+ /* Condition codes not set */
+ ED_MarkAsUntested (Expr);
+
}
-static void parsesub (int k, ExprDesc* lval)
-/* Parse an expression with the binary minus operator. lval contains the
+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.
*/
{
- ExprDesc lval2;
- unsigned flags; /* Operation flags */
- type* lhst; /* Type of left hand side */
- type* rhst; /* Type of right hand side */
- CodeMark Mark1; /* Save position of output queue */
- CodeMark Mark2; /* Another position in the queue */
- int rscale; /* Scale factor for the result */
+ ExprDesc Expr2;
+ unsigned flags; /* Operation flags */
+ Type* lhst; /* Type of left hand side */
+ Type* rhst; /* Type of right hand side */
+ CodeMark Mark1; /* Save position of output queue */
+ CodeMark Mark2; /* Another position in the queue */
+ int rscale; /* Scale factor for the result */
/* Skip the MINUS token */
NextToken ();
/* Get the left hand side type, initialize operation flags */
- lhst = lval->Type;
- flags = 0;
+ lhst = Expr->Type;
rscale = 1; /* Scale by 1, that is, don't scale */
/* Remember the output queue position, then bring the value onto the stack */
- Mark1 = GetCodePos ();
- exprhs (CF_NONE, k, lval); /* --> primary register */
- Mark2 = GetCodePos ();
+ GetCodePos (&Mark1);
+ LoadExpr (CF_NONE, Expr); /* --> primary register */
+ GetCodePos (&Mark2);
g_push (TypeOf (lhst), 0); /* --> stack */
/* Parse the right hand side */
- if (evalexpr (CF_NONE, hie9, &lval2) == 0) {
+ MarkedExprWithCheck (hie9, &Expr2);
+
+ /* Check for a constant rhs expression */
+ if (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2)) {
/* The right hand side is constant. Get the rhs type. */
- rhst = lval2.Type;
+ rhst = Expr2.Type;
/* Check left hand side */
- if (k == 0 && (lval->Flags & E_MCONST) != 0) {
+ if (ED_IsConstAbs (Expr)) {
/* Both sides are constant, remove generated code */
- RemoveCode (Mark1);
- pop (TypeOf (lhst)); /* Clean up the stack */
+ RemoveCode (&Mark1);
/* Check for pointer arithmetic */
if (IsClassPtr (lhst) && IsClassInt (rhst)) {
/* Left is pointer, right is int, must scale rhs */
- lval->ConstVal -= lval2.ConstVal * CheckedPSizeOf (lhst);
+ Expr->IVal -= Expr2.IVal * CheckedPSizeOf (lhst);
/* Operate on pointers, result type is a pointer */
} else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
/* Left is pointer, right is pointer, must scale result */
if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
Error ("Incompatible pointer types");
} else {
- lval->ConstVal = (lval->ConstVal - lval2.ConstVal) /
+ Expr->IVal = (Expr->IVal - Expr2.IVal) /
CheckedPSizeOf (lhst);
}
/* Operate on pointers, result type is an integer */
- lval->Type = type_int;
+ Expr->Type = type_int;
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
/* Integer subtraction */
- typeadjust (lval, &lval2, 1);
- lval->ConstVal -= lval2.ConstVal;
+ typeadjust (Expr, &Expr2, 1);
+ Expr->IVal -= Expr2.IVal;
} else {
/* OOPS */
Error ("Invalid operands for binary operator `-'");
}
/* Result is constant, condition codes not set */
- /* lval->Flags = E_MCONST; ### */
- lval->Test &= ~E_CC;
+ ED_MarkAsUntested (Expr);
} else {
/* Left hand side is not constant, right hand side is.
* Remove pushed value from stack.
*/
- RemoveCode (Mark2);
- pop (TypeOf (lhst));
+ RemoveCode (&Mark2);
if (IsClassPtr (lhst) && IsClassInt (rhst)) {
/* Left is pointer, right is int, must scale rhs */
- lval2.ConstVal *= CheckedPSizeOf (lhst);
+ Expr2.IVal *= CheckedPSizeOf (lhst);
/* Operate on pointers, result type is a pointer */
flags = CF_PTR;
} else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
} else {
rscale = CheckedPSizeOf (lhst);
}
- /* Operate on pointers, result type is an integer */
+ /* Operate on pointers, result type is an integer */
flags = CF_PTR;
- lval->Type = type_int;
+ Expr->Type = type_int;
} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
/* Integer subtraction */
- flags = typeadjust (lval, &lval2, 1);
+ flags = typeadjust (Expr, &Expr2, 1);
} else {
/* OOPS */
Error ("Invalid operands for binary operator `-'");
+ flags = CF_INT;
}
/* Do the subtraction */
- g_dec (flags | CF_CONST, lval2.ConstVal);
+ g_dec (flags | CF_CONST, Expr2.IVal);
- /* If this was a pointer subtraction, we must scale the result */
- if (rscale != 1) {
- g_scale (flags, -rscale);
- }
+ /* If this was a pointer subtraction, we must scale the result */
+ if (rscale != 1) {
+ g_scale (flags, -rscale);
+ }
- /* Result is in primary register */
- lval->Flags = E_MEXPR;
- lval->Test &= ~E_CC;
+ /* Result is a rvalue in the primary register */
+ ED_MakeRValExpr (Expr);
+ ED_MarkAsUntested (Expr);
- }
+ }
} else {
- /* Right hand side is not constant. Get the rhs type. */
- rhst = lval2.Type;
+ /* Not constant, load into the primary */
+ LoadExpr (CF_NONE, &Expr2);
+
+ /* Right hand side is not constant. Get the rhs type. */
+ rhst = Expr2.Type;
/* Check for pointer arithmetic */
- if (IsClassPtr (lhst) && IsClassInt (rhst)) {
+ if (IsClassPtr (lhst) && IsClassInt (rhst)) {
/* Left is pointer, right is int, must scale rhs */
- g_scale (CF_INT, CheckedPSizeOf (lhst));
- /* Operate on pointers, result type is a pointer */
- flags = CF_PTR;
- } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
- /* Left is pointer, right is pointer, must scale result */
- if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
- Error ("Incompatible pointer types");
- } else {
- rscale = CheckedPSizeOf (lhst);
- }
- /* Operate on pointers, result type is an integer */
- flags = CF_PTR;
- lval->Type = type_int;
+ g_scale (CF_INT, CheckedPSizeOf (lhst));
+ /* Operate on pointers, result type is a pointer */
+ flags = CF_PTR;
+ } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
+ /* Left is pointer, right is pointer, must scale result */
+ if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
+ Error ("Incompatible pointer types");
+ } else {
+ rscale = CheckedPSizeOf (lhst);
+ }
+ /* Operate on pointers, result type is an integer */
+ flags = CF_PTR;
+ 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.
*/
- if (lval->Flags == E_MCONST) {
- lval->Flags = E_MEXPR;
+ if (ED_IsLocAbs (Expr)) {
+ ED_MakeRValExpr (Expr);
}
/* Adjust operand types */
- flags = typeadjust (lval, &lval2, 0);
- } else {
+ flags = typeadjust (Expr, &Expr2, 0);
+ } else {
/* OOPS */
Error ("Invalid operands for binary operator `-'");
+ flags = CF_INT;
}
/* Generate code for the sub (the & is a hack here) */
g_scale (flags, -rscale);
}
- /* Result is in primary register */
- lval->Flags = E_MEXPR;
- lval->Test &= ~E_CC;
+ /* Result is a rvalue in the primary register */
+ ED_MakeRValExpr (Expr);
+ ED_MarkAsUntested (Expr);
}
}
-static int hie8 (ExprDesc* lval)
+void hie8 (ExprDesc* Expr)
/* Process + and - binary operators. */
{
- int k = hie9 (lval);
+ hie9 (Expr);
while (CurTok.Tok == TOK_PLUS || CurTok.Tok == TOK_MINUS) {
-
if (CurTok.Tok == TOK_PLUS) {
- parseadd (k, lval);
+ parseadd (Expr);
} else {
- parsesub (k, lval);
+ parsesub (Expr);
}
- k = 0;
}
- return k;
-}
-
-
-
-
-static int hie7 (ExprDesc *lval)
-/* Parse << and >>. */
-{
- static const GenDesc* hie7_ops [] = {
- &GenASL, &GenASR, 0
- };
- int UsedGen;
-
- return hie_internal (hie7_ops, lval, hie8, &UsedGen);
}
-static int hie6 (ExprDesc *lval)
-/* process greater-than type comparators */
+static void hie6 (ExprDesc* Expr)
+/* Handle greater-than type comparators */
{
- static const GenDesc* hie6_ops [] = {
- &GenLT, &GenLE, &GenGE, &GenGT, 0
+ static const GenDesc hie6_ops [] = {
+ { TOK_LT, GEN_NOPUSH, g_lt },
+ { TOK_LE, GEN_NOPUSH, g_le },
+ { TOK_GE, GEN_NOPUSH, g_ge },
+ { TOK_GT, GEN_NOPUSH, g_gt },
+ { TOK_INVALID, 0, 0 }
};
- return hie_compare (hie6_ops, lval, hie7);
+ hie_compare (hie6_ops, Expr, ShiftExpr);
}
-static int hie5 (ExprDesc *lval)
+static void hie5 (ExprDesc* Expr)
+/* Handle == and != */
{
- static const GenDesc* hie5_ops[] = {
- &GenEQ, &GenNE, 0
+ static const GenDesc hie5_ops[] = {
+ { TOK_EQ, GEN_NOPUSH, g_eq },
+ { TOK_NE, GEN_NOPUSH, g_ne },
+ { TOK_INVALID, 0, 0 }
};
- return hie_compare (hie5_ops, lval, hie6);
+ hie_compare (hie5_ops, Expr, hie6);
}
-static int hie4 (ExprDesc* lval)
+static void hie4 (ExprDesc* Expr)
/* Handle & (bitwise and) */
{
- static const GenDesc* hie4_ops [] = {
- &GenAND, 0
+ static const GenDesc hie4_ops[] = {
+ { TOK_AND, GEN_NOPUSH, g_and },
+ { TOK_INVALID, 0, 0 }
};
int UsedGen;
- return hie_internal (hie4_ops, lval, hie5, &UsedGen);
+ hie_internal (hie4_ops, Expr, hie5, &UsedGen);
}
-static int hie3 (ExprDesc *lval)
+static void hie3 (ExprDesc* Expr)
/* Handle ^ (bitwise exclusive or) */
{
- static const GenDesc* hie3_ops [] = {
- &GenXOR, 0
+ static const GenDesc hie3_ops[] = {
+ { TOK_XOR, GEN_NOPUSH, g_xor },
+ { TOK_INVALID, 0, 0 }
};
int UsedGen;
- return hie_internal (hie3_ops, lval, hie4, &UsedGen);
+ hie_internal (hie3_ops, Expr, hie4, &UsedGen);
}
-static int hie2 (ExprDesc *lval)
+static void hie2 (ExprDesc* Expr)
/* Handle | (bitwise or) */
{
- static const GenDesc* hie2_ops [] = {
- &GenOR, 0
+ static const GenDesc hie2_ops[] = {
+ { TOK_OR, GEN_NOPUSH, g_or },
+ { TOK_INVALID, 0, 0 }
};
int UsedGen;
- return hie_internal (hie2_ops, lval, hie3, &UsedGen);
+ hie_internal (hie2_ops, Expr, hie3, &UsedGen);
}
-static int hieAndPP (ExprDesc* lval)
+static void hieAndPP (ExprDesc* Expr)
/* Process "exp && exp" in preprocessor mode (that is, when the parser is
* called recursively from the preprocessor.
*/
{
- ExprDesc lval2;
+ ExprDesc Expr2;
- ConstSubExpr (hie2, lval);
+ ConstAbsIntExpr (hie2, Expr);
while (CurTok.Tok == TOK_BOOL_AND) {
- /* Left hand side must be an int */
- if (!IsClassInt (lval->Type)) {
- Error ("Left hand side must be of integer type");
- MakeConstIntExpr (lval, 1);
- }
-
/* Skip the && */
NextToken ();
/* Get rhs */
- ConstSubExpr (hie2, &lval2);
-
- /* Since we are in PP mode, all we know about is integers */
- if (!IsClassInt (lval2.Type)) {
- Error ("Right hand side must be of integer type");
- MakeConstIntExpr (&lval2, 1);
- }
+ ConstAbsIntExpr (hie2, &Expr2);
/* Combine the two */
- lval->ConstVal = (lval->ConstVal && lval2.ConstVal);
+ Expr->IVal = (Expr->IVal && Expr2.IVal);
}
-
- /* Always a rvalue */
- return 0;
}
-static int hieOrPP (ExprDesc *lval)
+static void hieOrPP (ExprDesc *Expr)
/* Process "exp || exp" in preprocessor mode (that is, when the parser is
* called recursively from the preprocessor.
*/
{
- ExprDesc lval2;
+ ExprDesc Expr2;
- ConstSubExpr (hieAndPP, lval);
+ ConstAbsIntExpr (hieAndPP, Expr);
while (CurTok.Tok == TOK_BOOL_OR) {
- /* Left hand side must be an int */
- if (!IsClassInt (lval->Type)) {
- Error ("Left hand side must be of integer type");
- MakeConstIntExpr (lval, 1);
- }
-
/* Skip the && */
NextToken ();
/* Get rhs */
- ConstSubExpr (hieAndPP, &lval2);
-
- /* Since we are in PP mode, all we know about is integers */
- if (!IsClassInt (lval2.Type)) {
- Error ("Right hand side must be of integer type");
- MakeConstIntExpr (&lval2, 1);
- }
+ ConstAbsIntExpr (hieAndPP, &Expr2);
/* Combine the two */
- lval->ConstVal = (lval->ConstVal || lval2.ConstVal);
+ Expr->IVal = (Expr->IVal || Expr2.IVal);
}
-
- /* Always a rvalue */
- return 0;
}
-static int hieAnd (ExprDesc* lval, unsigned TrueLab, int* BoolOp)
+static void hieAnd (ExprDesc* Expr, unsigned TrueLab, int* BoolOp)
/* Process "exp && exp" */
{
- int k;
- int lab;
- ExprDesc lval2;
+ int FalseLab;
+ ExprDesc Expr2;
- k = hie2 (lval);
+ hie2 (Expr);
if (CurTok.Tok == TOK_BOOL_AND) {
/* Tell our caller that we're evaluating a boolean */
*BoolOp = 1;
/* Get a label that we will use for false expressions */
- lab = GetLocalLabel ();
+ FalseLab = GetLocalLabel ();
/* If the expr hasn't set condition codes, set the force-test flag */
- if ((lval->Test & E_CC) == 0) {
- lval->Test |= E_FORCETEST;
+ if (!ED_IsTested (Expr)) {
+ ED_MarkForTest (Expr);
}
/* Load the value */
- exprhs (CF_FORCECHAR, k, lval);
+ LoadExpr (CF_FORCECHAR, Expr);
/* Generate the jump */
- g_falsejump (CF_NONE, lab);
+ g_falsejump (CF_NONE, FalseLab);
/* Parse more boolean and's */
while (CurTok.Tok == TOK_BOOL_AND) {
NextToken ();
/* Get rhs */
- k = hie2 (&lval2);
- if ((lval2.Test & E_CC) == 0) {
- lval2.Test |= E_FORCETEST;
+ hie2 (&Expr2);
+ if (!ED_IsTested (&Expr2)) {
+ ED_MarkForTest (&Expr2);
}
- exprhs (CF_FORCECHAR, k, &lval2);
+ LoadExpr (CF_FORCECHAR, &Expr2);
/* Do short circuit evaluation */
if (CurTok.Tok == TOK_BOOL_AND) {
- g_falsejump (CF_NONE, lab);
+ g_falsejump (CF_NONE, FalseLab);
} else {
/* Last expression - will evaluate to true */
g_truejump (CF_NONE, TrueLab);
}
/* Define the false jump label here */
- g_defcodelabel (lab);
+ g_defcodelabel (FalseLab);
- /* Define the label */
- lval->Flags = E_MEXPR;
- lval->Test |= E_CC; /* Condition codes are set */
- k = 0;
+ /* The result is an rvalue in primary */
+ ED_MakeRValExpr (Expr);
+ ED_TestDone (Expr); /* Condition codes are set */
}
- return k;
}
-static int hieOr (ExprDesc *lval)
+static void hieOr (ExprDesc *Expr)
/* Process "exp || exp". */
{
- int k;
- ExprDesc lval2;
- int BoolOp = 0; /* Did we have a boolean op? */
- int AndOp; /* Did we have a && operation? */
- unsigned TrueLab; /* Jump to this label if true */
+ ExprDesc Expr2;
+ int BoolOp = 0; /* Did we have a boolean op? */
+ int AndOp; /* Did we have a && operation? */
+ unsigned TrueLab; /* Jump to this label if true */
unsigned DoneLab;
/* Get a label */
TrueLab = GetLocalLabel ();
/* Call the next level parser */
- k = hieAnd (lval, TrueLab, &BoolOp);
+ hieAnd (Expr, TrueLab, &BoolOp);
/* Any boolean or's? */
if (CurTok.Tok == TOK_BOOL_OR) {
/* If the expr hasn't set condition codes, set the force-test flag */
- if ((lval->Test & E_CC) == 0) {
- lval->Test |= E_FORCETEST;
+ if (!ED_IsTested (Expr)) {
+ ED_MarkForTest (Expr);
}
/* Get first expr */
- exprhs (CF_FORCECHAR, k, lval);
+ LoadExpr (CF_FORCECHAR, Expr);
/* For each expression jump to TrueLab if true. Beware: If we
* had && operators, the jump is already in place!
/* Get a subexpr */
AndOp = 0;
- k = hieAnd (&lval2, TrueLab, &AndOp);
- if ((lval2.Test & E_CC) == 0) {
- lval2.Test |= E_FORCETEST;
+ hieAnd (&Expr2, TrueLab, &AndOp);
+ if (!ED_IsTested (&Expr2)) {
+ ED_MarkForTest (&Expr2);
}
- exprhs (CF_FORCECHAR, k, &lval2);
+ LoadExpr (CF_FORCECHAR, &Expr2);
/* If there is more to come, add shortcut boolean eval. */
g_truejump (CF_NONE, TrueLab);
}
- lval->Flags = E_MEXPR;
- lval->Test |= E_CC; /* Condition codes are set */
- k = 0;
+
+ /* The result is an rvalue in primary */
+ ED_MakeRValExpr (Expr);
+ ED_TestDone (Expr); /* Condition codes are set */
}
/* If we really had boolean ops, generate the end sequence */
g_getimmed (CF_INT | CF_CONST, 1, 0); /* Load TRUE */
g_defcodelabel (DoneLab);
}
- return k;
}
-static int hieQuest (ExprDesc *lval)
-/* Parse "lvalue ? exp : exp" */
+static void hieQuest (ExprDesc* Expr)
+/* Parse the ternary operator */
{
- int k;
- int labf;
- int labt;
- ExprDesc lval2; /* Expression 2 */
- ExprDesc lval3; /* Expression 3 */
- type* type2; /* Type of expression 2 */
- type* type3; /* Type of expression 3 */
- type* rtype; /* Type of result */
- CodeMark Mark1; /* Save position in output code */
- CodeMark Mark2; /* Save position in output code */
+ int FalseLab;
+ int TrueLab;
+ CodeMark TrueCodeEnd;
+ ExprDesc Expr2; /* Expression 2 */
+ ExprDesc Expr3; /* Expression 3 */
+ int Expr2IsNULL; /* Expression 2 is a NULL pointer */
+ int Expr3IsNULL; /* Expression 3 is a NULL pointer */
+ Type* ResultType; /* Type of result */
+ /* Call the lower level eval routine */
+ if (Preprocessing) {
+ hieOrPP (Expr);
+ } else {
+ hieOr (Expr);
+ }
- k = Preprocessing? hieOrPP (lval) : hieOr (lval);
+ /* Check if it's a ternary expression */
if (CurTok.Tok == TOK_QUEST) {
NextToken ();
- if ((lval->Test & E_CC) == 0) {
- /* Condition codes not set, force a test */
- lval->Test |= E_FORCETEST;
+ if (!ED_IsTested (Expr)) {
+ /* Condition codes not set, request a test */
+ ED_MarkForTest (Expr);
}
- exprhs (CF_NONE, k, lval);
- labf = GetLocalLabel ();
- g_falsejump (CF_NONE, labf);
-
- /* Parse second expression */
- k = expr (hie1, &lval2);
- type2 = lval2.Type;
- if (!IsTypeVoid (lval2.Type)) {
+ LoadExpr (CF_NONE, Expr);
+ FalseLab = GetLocalLabel ();
+ g_falsejump (CF_NONE, FalseLab);
+
+ /* Parse second expression. Remember for later if it is a NULL pointer
+ * expression, then load it into the primary.
+ */
+ ExprWithCheck (hie1, &Expr2);
+ Expr2IsNULL = ED_IsNullPtr (&Expr2);
+ if (!IsTypeVoid (Expr2.Type)) {
/* Load it into the primary */
- exprhs (CF_NONE, k, &lval2);
+ LoadExpr (CF_NONE, &Expr2);
+ ED_MakeRValExpr (&Expr2);
+ Expr2.Type = PtrConversion (Expr2.Type);
}
- labt = GetLocalLabel ();
+
+ /* Remember the current code position */
+ GetCodePos (&TrueCodeEnd);
+
+ /* Jump around the evaluation of the third expression */
+ TrueLab = GetLocalLabel ();
ConsumeColon ();
- g_jump (labt);
+ g_jump (TrueLab);
+
+ /* Jump here if the first expression was false */
+ g_defcodelabel (FalseLab);
- /* Parse the third expression */
- g_defcodelabel (labf);
- k = expr (hie1, &lval3);
- type3 = lval3.Type;
- if (!IsTypeVoid (lval3.Type)) {
+ /* Parse third expression. Remember for later if it is a NULL pointer
+ * expression, then load it into the primary.
+ */
+ ExprWithCheck (hie1, &Expr3);
+ Expr3IsNULL = ED_IsNullPtr (&Expr3);
+ if (!IsTypeVoid (Expr3.Type)) {
/* Load it into the primary */
- exprhs (CF_NONE, k, &lval3);
+ LoadExpr (CF_NONE, &Expr3);
+ ED_MakeRValExpr (&Expr3);
+ Expr3.Type = PtrConversion (Expr3.Type);
}
/* Check if any conversions are needed, if so, do them.
* type void.
* - all other cases are flagged by an error.
*/
- if (IsClassInt (type2) && IsClassInt (type3)) {
+ if (IsClassInt (Expr2.Type) && IsClassInt (Expr3.Type)) {
- /* Get common type */
- rtype = promoteint (type2, type3);
+ CodeMark CvtCodeStart;
+ CodeMark CvtCodeEnd;
- /* Convert the third expression to this type if needed */
- g_typecast (TypeOf (rtype), TypeOf (type3));
- /* Setup a new label so that the expr3 code will jump around
- * the type cast code for expr2.
- */
- labf = GetLocalLabel (); /* Get new label */
- Mark1 = GetCodePos (); /* Remember current position */
- g_jump (labf); /* Jump around code */
+ /* Get common type */
+ ResultType = promoteint (Expr2.Type, Expr3.Type);
- /* The jump for expr2 goes here */
- g_defcodelabel (labt);
+ /* Convert the third expression to this type if needed */
+ TypeConversion (&Expr3, ResultType);
- /* Create the typecast code for expr2 */
- Mark2 = GetCodePos (); /* Remember position */
- g_typecast (TypeOf (rtype), TypeOf (type2));
+ /* Emit conversion code for the second expression, but remember
+ * where it starts end ends.
+ */
+ GetCodePos (&CvtCodeStart);
+ TypeConversion (&Expr2, ResultType);
+ GetCodePos (&CvtCodeEnd);
- /* Jump here around the typecase code. */
- g_defcodelabel (labf);
- labt = 0; /* Mark other label as invalid */
+ /* If we had conversion code, move it to the right place */
+ if (!CodeRangeIsEmpty (&CvtCodeStart, &CvtCodeEnd)) {
+ MoveCode (&CvtCodeStart, &CvtCodeEnd, &TrueCodeEnd);
+ }
- } else if (IsClassPtr (type2) && IsClassPtr (type3)) {
+ } else if (IsClassPtr (Expr2.Type) && IsClassPtr (Expr3.Type)) {
/* Must point to same type */
- if (TypeCmp (Indirect (type2), Indirect (type3)) < TC_EQUAL) {
- Error ("Incompatible pointer types");
+ if (TypeCmp (Indirect (Expr2.Type), Indirect (Expr3.Type)) < TC_EQUAL) {
+ Error ("Incompatible pointer types");
}
/* Result has the common type */
- rtype = lval2.Type;
- } else if (IsClassPtr (type2) && IsNullPtr (&lval3)) {
+ ResultType = Expr2.Type;
+ } else if (IsClassPtr (Expr2.Type) && Expr3IsNULL) {
/* Result type is pointer, no cast needed */
- rtype = lval2.Type;
- } else if (IsNullPtr (&lval2) && IsClassPtr (type3)) {
+ ResultType = Expr2.Type;
+ } else if (Expr2IsNULL && IsClassPtr (Expr3.Type)) {
/* Result type is pointer, no cast needed */
- rtype = lval3.Type;
- } else if (IsTypeVoid (type2) && IsTypeVoid (type3)) {
+ ResultType = Expr3.Type;
+ } else if (IsTypeVoid (Expr2.Type) && IsTypeVoid (Expr3.Type)) {
/* Result type is void */
- rtype = lval3.Type;
- } else {
- Error ("Incompatible types");
- rtype = lval2.Type; /* Doesn't matter here */
- }
+ ResultType = Expr3.Type;
+ } else {
+ Error ("Incompatible types");
+ ResultType = Expr2.Type; /* Doesn't matter here */
+ }
- /* If we don't have the label defined until now, do it */
- if (labt) {
- g_defcodelabel (labt);
- }
+ /* Define the final label */
+ g_defcodelabel (TrueLab);
- /* Setup the target expression */
- lval->Flags = E_MEXPR;
- lval->Type = rtype;
- k = 0;
+ /* Setup the target expression */
+ ED_MakeRValExpr (Expr);
+ Expr->Type = ResultType;
}
- return k;
}
-static void opeq (const GenDesc* Gen, ExprDesc *lval, int k)
+static void opeq (const GenDesc* Gen, ExprDesc* Expr, const char* Op)
/* Process "op=" operators. */
{
- ExprDesc lval2;
+ ExprDesc Expr2;
unsigned flags;
CodeMark Mark;
int MustScale;
- NextToken ();
- if (k == 0) {
+ /* op= can only be used with lvalues */
+ if (!ED_IsLVal (Expr)) {
Error ("Invalid lvalue in assignment");
return;
}
+ /* The left side must not be const qualified */
+ if (IsQualConst (Expr->Type)) {
+ Error ("Assignment to const");
+ }
+
+ /* There must be an integer or pointer on the left side */
+ 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.
+ */
+ }
+
+ /* Skip the operator token */
+ NextToken ();
+
/* Determine the type of the lhs */
- flags = TypeOf (lval->Type);
- MustScale = (Gen->Func == g_add || Gen->Func == g_sub) &&
- lval->Type [0] == T_PTR;
+ flags = TypeOf (Expr->Type);
+ MustScale = (Gen->Func == g_add || Gen->Func == g_sub) && IsTypePtr (Expr->Type);
/* Get the lhs address on stack (if needed) */
- PushAddr (lval);
+ PushAddr (Expr);
/* Fetch the lhs into the primary register if needed */
- exprhs (CF_NONE, k, lval);
+ LoadExpr (CF_NONE, Expr);
/* Bring the lhs on stack */
- Mark = GetCodePos ();
+ GetCodePos (&Mark);
g_push (flags, 0);
/* Evaluate the rhs */
- if (evalexpr (CF_NONE, hie1, &lval2) == 0) {
- /* The resulting value is a constant. If the generator has the NOPUSH
- * flag set, don't push the lhs.
- */
- if (Gen->Flags & GEN_NOPUSH) {
- RemoveCode (Mark);
- pop (flags);
+ MarkedExprWithCheck (hie1, &Expr2);
+
+ /* The rhs must be an integer (or a float, but we don't support that yet */
+ 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.
+ */
+ }
+
+ /* 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.
+ */
+ if (Gen->Flags & GEN_NOPUSH) {
+ RemoveCode (&Mark);
}
if (MustScale) {
/* lhs is a pointer, scale rhs */
- lval2.ConstVal *= CheckedSizeOf (lval->Type+1);
+ Expr2.IVal *= CheckedSizeOf (Expr->Type+1);
}
/* If the lhs is character sized, the operation may be later done
* with characters.
*/
- if (CheckedSizeOf (lval->Type) == 1) {
+ if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
flags |= CF_FORCECHAR;
}
/* Special handling for add and sub - some sort of a hack, but short code */
if (Gen->Func == g_add) {
- g_inc (flags | CF_CONST, lval2.ConstVal);
+ g_inc (flags | CF_CONST, Expr2.IVal);
} else if (Gen->Func == g_sub) {
- g_dec (flags | CF_CONST, lval2.ConstVal);
+ g_dec (flags | CF_CONST, Expr2.IVal);
} else {
- Gen->Func (flags | CF_CONST, lval2.ConstVal);
+ if (Expr2.IVal == 0) {
+ /* Check for div by zero/mod by zero */
+ if (Gen->Func == g_div) {
+ Error ("Division by zero");
+ } else if (Gen->Func == g_mod) {
+ Error ("Modulo operation with zero");
+ }
+ }
+ Gen->Func (flags | CF_CONST, Expr2.IVal);
}
} else {
- /* rhs is not constant and already in the primary register */
+
+ /* rhs is not constant. Load into the primary */
+ LoadExpr (CF_NONE, &Expr2);
if (MustScale) {
/* lhs is a pointer, scale rhs */
- g_scale (TypeOf (lval2.Type), CheckedSizeOf (lval->Type+1));
+ g_scale (TypeOf (Expr2.Type), CheckedSizeOf (Expr->Type+1));
}
/* If the lhs is character sized, the operation may be later done
* with characters.
*/
- if (CheckedSizeOf (lval->Type) == 1) {
+ if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
flags |= CF_FORCECHAR;
}
/* Adjust the types of the operands if needed */
- Gen->Func (g_typeadjust (flags, TypeOf (lval2.Type)), 0);
+ Gen->Func (g_typeadjust (flags, TypeOf (Expr2.Type)), 0);
}
- store (lval);
- lval->Flags = E_MEXPR;
+ Store (Expr, 0);
+ ED_MakeRValExpr (Expr);
}
-static void addsubeq (const GenDesc* Gen, ExprDesc *lval, int k)
+static void addsubeq (const GenDesc* Gen, ExprDesc *Expr, const char* Op)
/* Process the += and -= operators */
{
- ExprDesc lval2;
+ ExprDesc Expr2;
unsigned lflags;
unsigned rflags;
- int MustScale;
+ int MustScale;
+ /* We're currently only able to handle some adressing modes */
+ if (ED_GetLoc (Expr) == E_LOC_EXPR || ED_GetLoc (Expr) == E_LOC_PRIMARY) {
+ /* Use generic routine */
+ opeq (Gen, Expr, Op);
+ return;
+ }
+
/* We must have an lvalue */
- if (k == 0) {
+ if (ED_IsRVal (Expr)) {
Error ("Invalid lvalue in assignment");
return;
}
- /* We're currently only able to handle some adressing modes */
- if ((lval->Flags & E_MGLOBAL) == 0 && /* Global address? */
- (lval->Flags & E_MLOCAL) == 0 && /* Local address? */
- (lval->Flags & E_MCONST) == 0) { /* Constant address? */
- /* Use generic routine */
- opeq (Gen, lval, k);
- return;
+ /* The left side must not be const qualified */
+ if (IsQualConst (Expr->Type)) {
+ Error ("Assignment to const");
+ }
+
+ /* There must be an integer or pointer on the left side */
+ 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.
+ */
}
/* Skip the operator */
NextToken ();
/* Check if we have a pointer expression and must scale rhs */
- MustScale = (lval->Type [0] == T_PTR);
+ MustScale = IsTypePtr (Expr->Type);
/* Initialize the code generator flags */
lflags = 0;
rflags = 0;
- /* Evaluate the rhs */
- if (evalexpr (CF_NONE, hie1, &lval2) == 0) {
- /* The resulting value is a constant. */
- if (MustScale) {
- /* lhs is a pointer, scale rhs */
- lval2.ConstVal *= CheckedSizeOf (lval->Type+1);
- }
+ /* Evaluate the rhs. We expect an integer here, since float is not
+ * 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.
+ */
+ }
+ if (ED_IsConstAbs (&Expr2)) {
+ /* The resulting value is a constant. Scale it. */
+ if (MustScale) {
+ Expr2.IVal *= CheckedSizeOf (Indirect (Expr->Type));
+ }
rflags |= CF_CONST;
- lflags |= CF_CONST;
+ lflags |= CF_CONST;
} else {
- /* rhs is not constant and already in the primary register */
+ /* Not constant, load into the primary */
+ LoadExpr (CF_NONE, &Expr2);
if (MustScale) {
/* lhs is a pointer, scale rhs */
- g_scale (TypeOf (lval2.Type), CheckedSizeOf (lval->Type+1));
+ g_scale (TypeOf (Expr2.Type), CheckedSizeOf (Indirect (Expr->Type)));
}
}
/* Setup the code generator flags */
- lflags |= TypeOf (lval->Type) | CF_FORCECHAR;
- rflags |= TypeOf (lval2.Type);
+ lflags |= TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR;
+ rflags |= TypeOf (Expr2.Type) | CF_FORCECHAR;
- /* Cast the rhs to the type of the lhs */
+ /* Convert the type of the lhs to that of the rhs */
g_typecast (lflags, rflags);
- /* Output apropriate code */
- if (lval->Flags & E_MGLOBAL) {
- /* Static variable */
- lflags |= GlobalModeFlags (lval->Flags);
- if (Gen->Tok == TOK_PLUS_ASSIGN) {
- g_addeqstatic (lflags, lval->Name, lval->ConstVal, lval2.ConstVal);
- } else {
- g_subeqstatic (lflags, lval->Name, lval->ConstVal, lval2.ConstVal);
- }
- } else if (lval->Flags & E_MLOCAL) {
- /* ref to localvar */
- if (Gen->Tok == TOK_PLUS_ASSIGN) {
- g_addeqlocal (lflags, lval->ConstVal, lval2.ConstVal);
- } else {
- g_subeqlocal (lflags, lval->ConstVal, lval2.ConstVal);
- }
- } else if (lval->Flags & E_MCONST) {
- /* ref to absolute address */
- lflags |= CF_ABSOLUTE;
- if (Gen->Tok == TOK_PLUS_ASSIGN) {
- g_addeqstatic (lflags, lval->ConstVal, 0, lval2.ConstVal);
- } else {
- g_subeqstatic (lflags, lval->ConstVal, 0, lval2.ConstVal);
- }
- } else if (lval->Flags & E_MEXPR) {
- /* Address in a/x. */
- if (Gen->Tok == TOK_PLUS_ASSIGN) {
- g_addeqind (lflags, lval->ConstVal, lval2.ConstVal);
- } else {
- g_subeqind (lflags, lval->ConstVal, lval2.ConstVal);
- }
- } else {
- Internal ("Invalid addressing mode");
- }
-
- /* Expression is in the primary now */
- lval->Flags = E_MEXPR;
-}
-
-
-
-static void Assignment (ExprDesc* lval)
-/* Parse an assignment */
-{
- int k;
- ExprDesc lval2;
- unsigned flags;
- type* ltype = lval->Type;
-
- /* Check for assignment to const */
- if (IsQualConst (ltype)) {
- Error ("Assignment to const");
- }
-
- /* cc65 does not have full support for handling structs by value. Since
- * assigning structs is one of the more useful operations from this
- * family, allow it here.
- */
- if (IsClassStruct (ltype)) {
-
- /* Bring the address of the lhs into the primary and push it */
- exprhs (0, 0, lval);
- g_push (CF_PTR | CF_UNSIGNED, 0);
-
- /* Get the expression on the right of the '=' into the primary */
- k = hie1 (&lval2);
- if (k) {
- /* Get the address */
- exprhs (0, 0, &lval2);
- }
-
- /* Push the address (or whatever is in ax in case of errors) */
- g_push (CF_PTR | CF_UNSIGNED, 0);
-
- /* Check for equality of the structs */
- if (TypeCmp (ltype, lval2.Type) < TC_STRICT_COMPATIBLE) {
- Error ("Incompatible types");
- }
-
- /* Load the size of the struct into the primary */
- g_getimmed (CF_INT | CF_UNSIGNED | CF_CONST, CheckedSizeOf (ltype), 0);
-
- /* Call the memcpy function */
- g_call (CF_FIXARGC, "memcpy", 4);
-
- } else {
-
- /* Get the address on stack if needed */
- PushAddr (lval);
-
- /* No struct, setup flags for the load */
-#if 0
- /* Generates wrong code!!! ### */
- flags = CheckedSizeOf (ltype) == 1? CF_FORCECHAR : CF_NONE;
-#else
- flags = CF_NONE;
-#endif
-
- /* Get the expression on the right of the '=' into the primary */
- if (evalexpr (flags, hie1, &lval2) == 0) {
- /* Constant expression. Adjust the types */
- assignadjust (ltype, &lval2);
- /* Put the value into the primary register */
- lconst (flags, &lval2);
- } else {
- /* Expression is not constant and already in the primary */
- assignadjust (ltype, &lval2);
- }
-
- /* Generate a store instruction */
- store (lval);
-
- }
-
- /* Value is still in primary */
- lval->Flags = E_MEXPR;
+ /* Output apropriate code depending on the location */
+ switch (ED_GetLoc (Expr)) {
+
+ case E_LOC_ABS:
+ /* Absolute: numeric address or const */
+ if (Gen->Tok == TOK_PLUS_ASSIGN) {
+ g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ } else {
+ g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ }
+ break;
+
+ case E_LOC_GLOBAL:
+ /* Global variable */
+ if (Gen->Tok == TOK_PLUS_ASSIGN) {
+ g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ } else {
+ g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ }
+ break;
+
+ case E_LOC_STATIC:
+ case E_LOC_LITERAL:
+ /* Static variable or literal in the literal pool */
+ if (Gen->Tok == TOK_PLUS_ASSIGN) {
+ g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ } else {
+ g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ }
+ break;
+
+ case E_LOC_REGISTER:
+ /* Register variable */
+ if (Gen->Tok == TOK_PLUS_ASSIGN) {
+ g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ } else {
+ g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
+ }
+ break;
+
+ case E_LOC_STACK:
+ /* Value on the stack */
+ if (Gen->Tok == TOK_PLUS_ASSIGN) {
+ g_addeqlocal (lflags, Expr->IVal, Expr2.IVal);
+ } else {
+ g_subeqlocal (lflags, Expr->IVal, Expr2.IVal);
+ }
+ break;
+
+ default:
+ Internal ("Invalid location in Store(): 0x%04X", ED_GetLoc (Expr));
+ }
+
+ /* Expression is a rvalue in the primary now */
+ ED_MakeRValExpr (Expr);
}
-int hie1 (ExprDesc* lval)
+void hie1 (ExprDesc* Expr)
/* Parse first level of expression hierarchy. */
{
- int k;
-
- k = hieQuest (lval);
+ hieQuest (Expr);
switch (CurTok.Tok) {
- case TOK_RPAREN:
- case TOK_SEMI:
- return k;
-
case TOK_ASSIGN:
- NextToken ();
- if (k == 0) {
- Error ("Invalid lvalue in assignment");
- } else {
- Assignment (lval);
- }
+ Assignment (Expr);
break;
case TOK_PLUS_ASSIGN:
- addsubeq (&GenPASGN, lval, k);
+ addsubeq (&GenPASGN, Expr, "+=");
break;
case TOK_MINUS_ASSIGN:
- addsubeq (&GenSASGN, lval, k);
+ addsubeq (&GenSASGN, Expr, "-=");
break;
case TOK_MUL_ASSIGN:
- opeq (&GenMASGN, lval, k);
+ opeq (&GenMASGN, Expr, "*=");
break;
case TOK_DIV_ASSIGN:
- opeq (&GenDASGN, lval, k);
+ opeq (&GenDASGN, Expr, "/=");
break;
case TOK_MOD_ASSIGN:
- opeq (&GenMOASGN, lval, k);
+ opeq (&GenMOASGN, Expr, "%=");
break;
case TOK_SHL_ASSIGN:
- opeq (&GenSLASGN, lval, k);
+ opeq (&GenSLASGN, Expr, "<<=");
break;
case TOK_SHR_ASSIGN:
- opeq (&GenSRASGN, lval, k);
+ opeq (&GenSRASGN, Expr, ">>=");
break;
case TOK_AND_ASSIGN:
- opeq (&GenAASGN, lval, k);
+ opeq (&GenAASGN, Expr, "&=");
break;
case TOK_XOR_ASSIGN:
- opeq (&GenXOASGN, lval, k);
+ opeq (&GenXOASGN, Expr, "^=");
break;
case TOK_OR_ASSIGN:
- opeq (&GenOASGN, lval, k);
+ opeq (&GenOASGN, Expr, "|=");
break;
default:
- return k;
+ break;
}
- return 0;
}
-int hie0 (ExprDesc *lval)
+void hie0 (ExprDesc *Expr)
/* Parse comma operator. */
{
- int k;
-
- k = hie1 (lval);
+ hie1 (Expr);
while (CurTok.Tok == TOK_COMMA) {
- NextToken ();
- k = hie1 (lval);
+ NextToken ();
+ hie1 (Expr);
}
- return k;
}
-int evalexpr (unsigned flags, int (*f) (ExprDesc*), ExprDesc* lval)
+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 lval struct. If the
- * result is not constant, exprhs is called to bring the value into the
+ * 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.
*/
{
- int k;
-
/* Evaluate */
- k = f (lval);
- if (k == 0 && lval->Flags == E_MCONST) {
+ ExprWithCheck (Func, Expr);
+
+ /* Check for a constant expression */
+ if (ED_IsConstAbs (Expr)) {
/* Constant expression */
return 0;
} else {
/* Not constant, load into the primary */
- exprhs (flags, k, lval);
+ LoadExpr (Flags, Expr);
return 1;
}
}
-static int expr (int (*func) (ExprDesc*), ExprDesc *lval)
-/* Expression parser; func is either hie0 or hie1. */
+void Expression0 (ExprDesc* Expr)
+/* Evaluate an expression via hie0 and put the result into the primary register */
{
- int k;
- int savsp;
-
- savsp = oursp;
-
- k = (*func) (lval);
-
- /* Do some checks if code generation is still constistent */
- if (savsp != oursp) {
- if (Debug) {
- fprintf (stderr, "oursp != savesp (%d != %d)\n", oursp, savsp);
- } else {
- Internal ("oursp != savsp (%d != %d)", oursp, savsp);
- }
- }
- return k;
+ ExprWithCheck (hie0, Expr);
+ LoadExpr (CF_NONE, Expr);
}
-void expression1 (ExprDesc* lval)
-/* Evaluate an expression on level 1 (no comma operator) and put it into
- * the primary register
+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.
*/
{
- memset (lval, 0, sizeof (*lval));
- exprhs (CF_NONE, expr (hie1, lval), lval);
-}
-
-
-
-void expression (ExprDesc* lval)
-/* Evaluate an expression and put it into the primary register */
-{
- memset (lval, 0, sizeof (*lval));
- exprhs (CF_NONE, expr (hie0, lval), lval);
-}
-
-
-
-void ConstExpr (ExprDesc* lval)
-/* Get a constant value */
-{
- memset (lval, 0, sizeof (*lval));
- if (expr (hie1, lval) != 0 || (lval->Flags & E_MCONST) == 0) {
+ ExprWithCheck (Func, Expr);
+ if (!ED_IsConst (Expr)) {
Error ("Constant expression expected");
/* To avoid any compiler errors, make the expression a valid const */
- MakeConstIntExpr (lval, 1);
- }
-}
-
-
-
-void ConstIntExpr (ExprDesc* Val)
-/* Get a constant int value */
-{
- memset (Val, 0, sizeof (*Val));
- if (expr (hie1, Val) != 0 ||
- (Val->Flags & E_MCONST) == 0 ||
- !IsClassInt (Val->Type)) {
- Error ("Constant integer expression expected");
- /* To avoid any compiler errors, make the expression a valid const */
- MakeConstIntExpr (Val, 1);
- }
-}
-
-
-
-void intexpr (ExprDesc* lval)
-/* Get an integer expression */
-{
- expression (lval);
- if (!IsClassInt (lval->Type)) {
- Error ("Integer expression expected");
- /* To avoid any compiler errors, make the expression a valid int */
- MakeConstIntExpr (lval, 1);
+ ED_MakeConstAbsInt (Expr, 1);
}
}
-void boolexpr (ExprDesc* lval)
-/* Get a boolean expression */
+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.
+ */
{
- /* Read an expression */
- expression (lval);
-
- /* If it's an integer, it's ok. If it's not an integer, but a pointer,
- * the pointer used in a boolean context is also ok
- */
- if (!IsClassInt (lval->Type) && !IsClassPtr (lval->Type)) {
+ ExprWithCheck (Func, Expr);
+ if (!ED_IsBool (Expr)) {
Error ("Boolean expression expected");
/* To avoid any compiler errors, make the expression a valid int */
- MakeConstIntExpr (lval, 1);
+ ED_MakeConstAbsInt (Expr, 1);
}
}
-void test (unsigned label, int cond)
-/* Generate code to perform test and jump if false. */
+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.
+ */
{
- int k;
- ExprDesc lval;
-
- /* Eat the parenthesis */
- ConsumeLParen ();
-
- /* Prepare the expression, setup labels */
- memset (&lval, 0, sizeof (lval));
-
- /* Generate code to eval the expr */
- k = expr (hie0, &lval);
- if (k == 0 && lval.Flags == E_MCONST) {
- /* Constant rvalue */
- if (cond == 0 && lval.ConstVal == 0) {
- g_jump (label);
- Warning ("Unreachable code");
- } else if (cond && lval.ConstVal) {
- g_jump (label);
- }
- ConsumeRParen ();
- return;
- }
-
- /* If the expr hasn't set condition codes, set the force-test flag */
- if ((lval.Test & E_CC) == 0) {
- lval.Test |= E_FORCETEST;
- }
-
- /* Load the value into the primary register */
- exprhs (CF_FORCECHAR, k, &lval);
-
- /* Generate the jump */
- if (cond) {
- g_truejump (CF_NONE, label);
- } else {
- /* Special case (putting this here is a small hack - but hey, the
- * compiler itself is one big hack...): If a semicolon follows, we
- * don't have a statement and may omit the jump.
- */
- if (CurTok.Tok != TOK_SEMI) {
- g_falsejump (CF_NONE, label);
- }
+ ExprWithCheck (Func, Expr);
+ if (!ED_IsConstAbsInt (Expr)) {
+ Error ("Constant integer expression expected");
+ /* To avoid any compiler errors, make the expression a valid const */
+ ED_MakeConstAbsInt (Expr, 1);
}
-
- /* Check for the closing brace */
- ConsumeRParen ();
}
-
projects / cc65 / blobdiff