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cc65/src/cc65/declare.c
Greg King a6b04f6e97 Changed most "backticks" (grave accents) into apostrophes. 
Quotations that are embraced by tick marks now look better, in most fonts.
2019-01-05 14:57:12 -05:00

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/*****************************************************************************/
/* */
/* declare.c */
/* */
/* Parse variable and function declarations */
/* */
/* */
/* */
/* (C) 1998-2015, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <errno.h>
/* common */
#include "addrsize.h"
#include "mmodel.h"
#include "xmalloc.h"
/* cc65 */
#include "anonname.h"
#include "codegen.h"
#include "datatype.h"
#include "declare.h"
#include "declattr.h"
#include "error.h"
#include "expr.h"
#include "funcdesc.h"
#include "function.h"
#include "global.h"
#include "litpool.h"
#include "pragma.h"
#include "scanner.h"
#include "standard.h"
#include "symtab.h"
#include "wrappedcall.h"
#include "typeconv.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
typedef struct StructInitData StructInitData;
struct StructInitData {
unsigned Size; /* Size of struct */
unsigned Offs; /* Current offset in struct */
unsigned BitVal; /* Summed up bit-field value */
unsigned ValBits; /* Valid bits in Val */
};
/*****************************************************************************/
/* Forwards */
/*****************************************************************************/
static void ParseTypeSpec (DeclSpec* D, long Default, TypeCode Qualifiers);
/* Parse a type specifier */
static unsigned ParseInitInternal (Type* T, int AllowFlexibleMembers);
/* Parse initialization of variables. Return the number of data bytes. */
/*****************************************************************************/
/* Internal functions */
/*****************************************************************************/
static void DuplicateQualifier (const char* Name)
/* Print an error message */
{
Warning ("Duplicate qualifier: '%s'", Name);
}
static TypeCode OptionalQualifiers (TypeCode Allowed)
/* Read type qualifiers if we have any. Allowed specifies the allowed
** qualifiers.
*/
{
/* We start without any qualifiers */
TypeCode Q = T_QUAL_NONE;
/* Check for more qualifiers */
while (1) {
switch (CurTok.Tok) {
case TOK_CONST:
if (Allowed & T_QUAL_CONST) {
if (Q & T_QUAL_CONST) {
DuplicateQualifier ("const");
}
Q |= T_QUAL_CONST;
} else {
goto Done;
}
break;
case TOK_VOLATILE:
if (Allowed & T_QUAL_VOLATILE) {
if (Q & T_QUAL_VOLATILE) {
DuplicateQualifier ("volatile");
}
Q |= T_QUAL_VOLATILE;
} else {
goto Done;
}
break;
case TOK_RESTRICT:
if (Allowed & T_QUAL_RESTRICT) {
if (Q & T_QUAL_RESTRICT) {
DuplicateQualifier ("restrict");
}
Q |= T_QUAL_RESTRICT;
} else {
goto Done;
}
break;
case TOK_NEAR:
if (Allowed & T_QUAL_NEAR) {
if (Q & T_QUAL_NEAR) {
DuplicateQualifier ("near");
}
Q |= T_QUAL_NEAR;
} else {
goto Done;
}
break;
case TOK_FAR:
if (Allowed & T_QUAL_FAR) {
if (Q & T_QUAL_FAR) {
DuplicateQualifier ("far");
}
Q |= T_QUAL_FAR;
} else {
goto Done;
}
break;
case TOK_FASTCALL:
if (Allowed & T_QUAL_FASTCALL) {
if (Q & T_QUAL_FASTCALL) {
DuplicateQualifier ("fastcall");
}
Q |= T_QUAL_FASTCALL;
} else {
goto Done;
}
break;
case TOK_CDECL:
if (Allowed & T_QUAL_CDECL) {
if (Q & T_QUAL_CDECL) {
DuplicateQualifier ("cdecl");
}
Q |= T_QUAL_CDECL;
} else {
goto Done;
}
break;
default:
goto Done;
}
/* Skip the token */
NextToken ();
}
Done:
/* We cannot have more than one address size far qualifier */
switch (Q & T_QUAL_ADDRSIZE) {
case T_QUAL_NONE:
case T_QUAL_NEAR:
case T_QUAL_FAR:
break;
default:
Error ("Cannot specify more than one address size qualifier");
Q &= ~T_QUAL_ADDRSIZE;
}
/* We cannot have more than one calling convention specifier */
switch (Q & T_QUAL_CCONV) {
case T_QUAL_NONE:
case T_QUAL_FASTCALL:
case T_QUAL_CDECL:
break;
default:
Error ("Cannot specify more than one calling convention qualifier");
Q &= ~T_QUAL_CCONV;
}
/* Return the qualifiers read */
return Q;
}
static void OptionalInt (void)
/* Eat an optional "int" token */
{
if (CurTok.Tok == TOK_INT) {
/* Skip it */
NextToken ();
}
}
static void OptionalSigned (void)
/* Eat an optional "signed" token */
{
if (CurTok.Tok == TOK_SIGNED) {
/* Skip it */
NextToken ();
}
}
static void InitDeclSpec (DeclSpec* D)
/* Initialize the DeclSpec struct for use */
{
D->StorageClass = 0;
D->Type[0].C = T_END;
D->Flags = 0;
}
static void InitDeclaration (Declaration* D)
/* Initialize the Declaration struct for use */
{
D->Ident[0] = '\0';
D->Type[0].C = T_END;
D->Index = 0;
D->Attributes = 0;
}
static void NeedTypeSpace (Declaration* D, unsigned Count)
/* Check if there is enough space for Count type specifiers within D */
{
if (D->Index + Count >= MAXTYPELEN) {
/* We must call Fatal() here, since calling Error() will try to
** continue, and the declaration type is not correctly terminated
** in case we come here.
*/
Fatal ("Too many type specifiers");
}
}
static void AddTypeToDeclaration (Declaration* D, TypeCode T)
/* Add a type specifier to the type of a declaration */
{
NeedTypeSpace (D, 1);
D->Type[D->Index++].C = T;
}
static void FixQualifiers (Type* DataType)
/* Apply several fixes to qualifiers */
{
Type* T;
TypeCode Q;
/* Using typedefs, it is possible to generate declarations that have
** type qualifiers attached to an array, not the element type. Go and
** fix these here.
*/
T = DataType;
Q = T_QUAL_NONE;
while (T->C != T_END) {
if (IsTypeArray (T)) {
/* Extract any type qualifiers */
Q |= GetQualifier (T);
T->C = UnqualifiedType (T->C);
} else {
/* Add extracted type qualifiers here */
T->C |= Q;
Q = T_QUAL_NONE;
}
++T;
}
/* Q must be empty now */
CHECK (Q == T_QUAL_NONE);
/* Do some fixes on pointers and functions. */
T = DataType;
while (T->C != T_END) {
if (IsTypePtr (T)) {
/* Calling convention qualifier on the pointer? */
if (IsQualCConv (T)) {
/* Pull the convention off of the pointer */
Q = T[0].C & T_QUAL_CCONV;
T[0].C &= ~T_QUAL_CCONV;
/* Pointer to a function which doesn't have an explicit convention? */
if (IsTypeFunc (T + 1)) {
if (IsQualCConv (T + 1)) {
if ((T[1].C & T_QUAL_CCONV) == Q) {
Warning ("Pointer duplicates function's calling convention");
} else {
Error ("Function's and pointer's calling conventions are different");
}
} else {
if (Q == T_QUAL_FASTCALL && IsVariadicFunc (T + 1)) {
Error ("Variadic-function pointers cannot be __fastcall__");
} else {
/* Move the qualifier from the pointer to the function. */
T[1].C |= Q;
}
}
} else {
Error ("Not pointer to a function; can't use a calling convention");
}
}
/* Apply the default far and near qualifiers if none are given */
Q = (T[0].C & T_QUAL_ADDRSIZE);
if (Q == T_QUAL_NONE) {
/* No address size qualifiers specified */
if (IsTypeFunc (T+1)) {
/* Pointer to function. Use the qualifier from the function,
** or the default if the function doesn't have one.
*/
Q = (T[1].C & T_QUAL_ADDRSIZE);
if (Q == T_QUAL_NONE) {
Q = CodeAddrSizeQualifier ();
}
} else {
Q = DataAddrSizeQualifier ();
}
T[0].C |= Q;
} else {
/* We have address size qualifiers. If followed by a function,
** apply them to the function also.
*/
if (IsTypeFunc (T+1)) {
TypeCode FQ = (T[1].C & T_QUAL_ADDRSIZE);
if (FQ == T_QUAL_NONE) {
T[1].C |= Q;
} else if (FQ != Q) {
Error ("Address size qualifier mismatch");
T[1].C = (T[1].C & ~T_QUAL_ADDRSIZE) | Q;
}
}
}
} else if (IsTypeFunc (T)) {
/* Apply the default far and near qualifiers if none are given */
if ((T[0].C & T_QUAL_ADDRSIZE) == 0) {
T[0].C |= CodeAddrSizeQualifier ();
}
}
++T;
}
}
static void ParseStorageClass (DeclSpec* D, unsigned DefStorage)
/* Parse a storage class */
{
/* Assume we're using an explicit storage class */
D->Flags &= ~DS_DEF_STORAGE;
/* Check the storage class given */
switch (CurTok.Tok) {
case TOK_EXTERN:
D->StorageClass = SC_EXTERN | SC_STATIC;
NextToken ();
break;
case TOK_STATIC:
D->StorageClass = SC_STATIC;
NextToken ();
break;
case TOK_REGISTER:
D->StorageClass = SC_REGISTER | SC_STATIC;
NextToken ();
break;
case TOK_AUTO:
D->StorageClass = SC_AUTO;
NextToken ();
break;
case TOK_TYPEDEF:
D->StorageClass = SC_TYPEDEF;
NextToken ();
break;
default:
/* No storage class given, use default */
D->Flags |= DS_DEF_STORAGE;
D->StorageClass = DefStorage;
break;
}
}
static void ParseEnumDecl (void)
/* Process an enum declaration . */
{
int EnumVal;
ident Ident;
/* Accept forward definitions */
if (CurTok.Tok != TOK_LCURLY) {
return;
}
/* Skip the opening curly brace */
NextToken ();
/* Read the enum tags */
EnumVal = 0;
while (CurTok.Tok != TOK_RCURLY) {
/* We expect an identifier */
if (CurTok.Tok != TOK_IDENT) {
Error ("Identifier expected");
continue;
}
/* Remember the identifier and skip it */
strcpy (Ident, CurTok.Ident);
NextToken ();
/* Check for an assigned value */
if (CurTok.Tok == TOK_ASSIGN) {
ExprDesc Expr;
NextToken ();
ConstAbsIntExpr (hie1, &Expr);
EnumVal = Expr.IVal;
}
/* Add an entry to the symbol table */
AddConstSym (Ident, type_int, SC_ENUM, EnumVal++);
/* Check for end of definition */
if (CurTok.Tok != TOK_COMMA)
break;
NextToken ();
}
ConsumeRCurly ();
}
static int ParseFieldWidth (Declaration* Decl)
/* Parse an optional field width. Returns -1 if no field width is specified,
** otherwise the width of the field.
*/
{
ExprDesc Expr;
if (CurTok.Tok != TOK_COLON) {
/* No bit-field declaration */
return -1;
}
/* Read the width */
NextToken ();
ConstAbsIntExpr (hie1, &Expr);
if (Expr.IVal < 0) {
Error ("Negative width in bit-field");
return -1;
}
if (Expr.IVal > (int) INT_BITS) {
Error ("Width of bit-field exceeds its type");
return -1;
}
if (Expr.IVal == 0 && Decl->Ident[0] != '\0') {
Error ("Zero width for named bit-field");
return -1;
}
if (!IsTypeInt (Decl->Type)) {
/* Only integer types may be used for bit-fields */
Error ("Bit-field has invalid type");
return -1;
}
/* Return the field width */
return (int) Expr.IVal;
}
static SymEntry* StructOrUnionForwardDecl (const char* Name, unsigned Type)
/* Handle a struct or union forward decl */
{
/* Try to find a struct/union with the given name. If there is none,
** insert a forward declaration into the current lexical level.
*/
SymEntry* Entry = FindTagSym (Name);
if (Entry == 0) {
Entry = AddStructSym (Name, Type, 0, 0);
} else if ((Entry->Flags & SC_TYPEMASK) != Type) {
/* Already defined, but no struct */
Error ("Symbol '%s' is already different kind", Name);
}
return Entry;
}
static unsigned CopyAnonStructFields (const Declaration* Decl, int Offs)
/* Copy fields from an anon union/struct into the current lexical level. The
** function returns the size of the embedded struct/union.
*/
{
/* Get the pointer to the symbol table entry of the anon struct */
SymEntry* Entry = GetSymEntry (Decl->Type);
/* Get the size of the anon struct */
unsigned Size = Entry->V.S.Size;
/* Get the symbol table containing the fields. If it is empty, there has
** been an error before, so bail out.
*/
SymTable* Tab = Entry->V.S.SymTab;
if (Tab == 0) {
/* Incomplete definition - has been flagged before */
return Size;
}
/* Get a pointer to the list of symbols. Then walk the list adding copies
** of the embedded struct to the current level.
*/
Entry = Tab->SymHead;
while (Entry) {
/* Enter a copy of this symbol adjusting the offset. We will just
** reuse the type string here.
*/
AddLocalSym (Entry->Name, Entry->Type, SC_STRUCTFIELD, Offs + Entry->V.Offs);
/* Currently, there can not be any attributes, but if there will be
** some in the future, we want to know this.
*/
CHECK (Entry->Attr == 0);
/* Next entry */
Entry = Entry->NextSym;
}
/* Return the size of the embedded struct */
return Size;
}
static SymEntry* ParseUnionDecl (const char* Name)
/* Parse a union declaration. */
{
unsigned UnionSize;
unsigned FieldSize;
int FieldWidth; /* Width in bits, -1 if not a bit-field */
SymTable* FieldTab;
if (CurTok.Tok != TOK_LCURLY) {
/* Just a forward declaration. */
return StructOrUnionForwardDecl (Name, SC_UNION);
}
/* Add a forward declaration for the struct in the current lexical level */
AddStructSym (Name, SC_UNION, 0, 0);
/* Skip the curly brace */
NextToken ();
/* Enter a new lexical level for the struct */
EnterStructLevel ();
/* Parse union fields */
UnionSize = 0;
while (CurTok.Tok != TOK_RCURLY) {
/* Get the type of the entry */
DeclSpec Spec;
InitDeclSpec (&Spec);
ParseTypeSpec (&Spec, -1, T_QUAL_NONE);
/* Read fields with this type */
while (1) {
Declaration Decl;
/* Get type and name of the struct field */
ParseDecl (&Spec, &Decl, DM_ACCEPT_IDENT);
/* Check for a bit-field declaration */
FieldWidth = ParseFieldWidth (&Decl);
/* Ignore zero sized bit fields in a union */
if (FieldWidth == 0) {
goto NextMember;
}
/* Check for fields without a name */
if (Decl.Ident[0] == '\0') {
/* In cc65 mode, we allow anonymous structs/unions within
** a union.
*/
if (IS_Get (&Standard) >= STD_CC65 && IsClassStruct (Decl.Type)) {
/* This is an anonymous struct or union. Copy the fields
** into the current level.
*/
FieldSize = CopyAnonStructFields (&Decl, 0);
if (FieldSize > UnionSize) {
UnionSize = FieldSize;
}
} else {
/* A non bit-field without a name is legal but useless */
Warning ("Declaration does not declare anything");
}
goto NextMember;
}
/* Handle sizes */
FieldSize = CheckedSizeOf (Decl.Type);
if (FieldSize > UnionSize) {
UnionSize = FieldSize;
}
/* Add a field entry to the table. */
if (FieldWidth > 0) {
AddBitField (Decl.Ident, 0, 0, FieldWidth);
} else {
AddLocalSym (Decl.Ident, Decl.Type, SC_STRUCTFIELD, 0);
}
NextMember: if (CurTok.Tok != TOK_COMMA) {
break;
}
NextToken ();
}
ConsumeSemi ();
}
/* Skip the closing brace */
NextToken ();
/* Remember the symbol table and leave the struct level */
FieldTab = GetSymTab ();
LeaveStructLevel ();
/* Make a real entry from the forward decl and return it */
return AddStructSym (Name, SC_UNION, UnionSize, FieldTab);
}
static SymEntry* ParseStructDecl (const char* Name)
/* Parse a struct declaration. */
{
unsigned StructSize;
int FlexibleMember;
int BitOffs; /* Bit offset for bit-fields */
int FieldWidth; /* Width in bits, -1 if not a bit-field */
SymTable* FieldTab;
if (CurTok.Tok != TOK_LCURLY) {
/* Just a forward declaration. */
return StructOrUnionForwardDecl (Name, SC_STRUCT);
}
/* Add a forward declaration for the struct in the current lexical level */
AddStructSym (Name, SC_STRUCT, 0, 0);
/* Skip the curly brace */
NextToken ();
/* Enter a new lexical level for the struct */
EnterStructLevel ();
/* Parse struct fields */
FlexibleMember = 0;
StructSize = 0;
BitOffs = 0;
while (CurTok.Tok != TOK_RCURLY) {
/* Get the type of the entry */
DeclSpec Spec;
InitDeclSpec (&Spec);
ParseTypeSpec (&Spec, -1, T_QUAL_NONE);
/* Read fields with this type */
while (1) {
Declaration Decl;
ident Ident;
/* If we had a flexible array member before, no other fields can
** follow.
*/
if (FlexibleMember) {
Error ("Flexible array member must be last field");
FlexibleMember = 0; /* Avoid further errors */
}
/* Get type and name of the struct field */
ParseDecl (&Spec, &Decl, DM_ACCEPT_IDENT);
/* Check for a bit-field declaration */
FieldWidth = ParseFieldWidth (&Decl);
/* If this is not a bit field, or the bit field is too large for
** the remainder of the current member, or we have a bit field
** with width zero, align the struct to the next member by adding
** a member with an anonymous name.
*/
if (BitOffs > 0) {
if (FieldWidth <= 0 || (BitOffs + FieldWidth) > (int) INT_BITS) {
/* We need an anonymous name */
AnonName (Ident, "bit-field");
/* Add an anonymous bit-field that aligns to the next
** storage unit.
*/
AddBitField (Ident, StructSize, BitOffs, INT_BITS - BitOffs);
/* No bits left */
StructSize += SIZEOF_INT;
BitOffs = 0;
}
}
/* Apart from the above, a bit field with width 0 is not processed
** further.
*/
if (FieldWidth == 0) {
goto NextMember;
}
/* Check if this field is a flexible array member, and
** calculate the size of the field.
*/
if (IsTypeArray (Decl.Type) && GetElementCount (Decl.Type) == UNSPECIFIED) {
/* Array with unspecified size */
if (StructSize == 0) {
Error ("Flexible array member cannot be first struct field");
}
FlexibleMember = 1;
/* Assume zero for size calculations */
SetElementCount (Decl.Type, FLEXIBLE);
}
/* Check for fields without names */
if (Decl.Ident[0] == '\0') {
if (FieldWidth < 0) {
/* In cc65 mode, we allow anonymous structs/unions within
** a struct.
*/
if (IS_Get (&Standard) >= STD_CC65 && IsClassStruct (Decl.Type)) {
/* This is an anonymous struct or union. Copy the
** fields into the current level.
*/
StructSize += CopyAnonStructFields (&Decl, StructSize);
} else {
/* A non bit-field without a name is legal but useless */
Warning ("Declaration does not declare anything");
}
goto NextMember;
} else {
/* A bit-field without a name will get an anonymous one */
AnonName (Decl.Ident, "bit-field");
}
}
/* Add a field entry to the table */
if (FieldWidth > 0) {
/* Add full byte from the bit offset to the variable offset.
** This simplifies handling he bit-field as a char type
** in expressions.
*/
unsigned Offs = StructSize + (BitOffs / CHAR_BITS);
AddBitField (Decl.Ident, Offs, BitOffs % CHAR_BITS, FieldWidth);
BitOffs += FieldWidth;
CHECK (BitOffs <= (int) INT_BITS);
if (BitOffs == INT_BITS) {
StructSize += SIZEOF_INT;
BitOffs = 0;
}
} else {
AddLocalSym (Decl.Ident, Decl.Type, SC_STRUCTFIELD, StructSize);
if (!FlexibleMember) {
StructSize += CheckedSizeOf (Decl.Type);
}
}
NextMember: if (CurTok.Tok != TOK_COMMA) {
break;
}
NextToken ();
}
ConsumeSemi ();
}
/* If we have bits from bit-fields left, add them to the size. */
if (BitOffs > 0) {
StructSize += ((BitOffs + CHAR_BITS - 1) / CHAR_BITS);
}
/* Skip the closing brace */
NextToken ();
/* Remember the symbol table and leave the struct level */
FieldTab = GetSymTab ();
LeaveStructLevel ();
/* Make a real entry from the forward decl and return it */
return AddStructSym (Name, SC_STRUCT, StructSize, FieldTab);
}
static void ParseTypeSpec (DeclSpec* D, long Default, TypeCode Qualifiers)
/* Parse a type specifier */
{
ident Ident;
SymEntry* Entry;
/* Assume we have an explicit type */
D->Flags &= ~DS_DEF_TYPE;
/* Read type qualifiers if we have any */
Qualifiers |= OptionalQualifiers (T_QUAL_CONST | T_QUAL_VOLATILE);
/* Look at the data type */
switch (CurTok.Tok) {
case TOK_VOID:
NextToken ();
D->Type[0].C = T_VOID;
D->Type[0].A.U = 0;
D->Type[1].C = T_END;
break;
case TOK_CHAR:
NextToken ();
D->Type[0].C = GetDefaultChar();
D->Type[1].C = T_END;
break;
case TOK_LONG:
NextToken ();
if (CurTok.Tok == TOK_UNSIGNED) {
NextToken ();
OptionalInt ();
D->Type[0].C = T_ULONG;
D->Type[1].C = T_END;
} else {
OptionalSigned ();
OptionalInt ();
D->Type[0].C = T_LONG;
D->Type[1].C = T_END;
}
break;
case TOK_SHORT:
NextToken ();
if (CurTok.Tok == TOK_UNSIGNED) {
NextToken ();
OptionalInt ();
D->Type[0].C = T_USHORT;
D->Type[1].C = T_END;
} else {
OptionalSigned ();
OptionalInt ();
D->Type[0].C = T_SHORT;
D->Type[1].C = T_END;
}
break;
case TOK_INT:
NextToken ();
D->Type[0].C = T_INT;
D->Type[1].C = T_END;
break;
case TOK_SIGNED:
NextToken ();
switch (CurTok.Tok) {
case TOK_CHAR:
NextToken ();
D->Type[0].C = T_SCHAR;
D->Type[1].C = T_END;
break;
case TOK_SHORT:
NextToken ();
OptionalInt ();
D->Type[0].C = T_SHORT;
D->Type[1].C = T_END;
break;
case TOK_LONG:
NextToken ();
OptionalInt ();
D->Type[0].C = T_LONG;
D->Type[1].C = T_END;
break;
case TOK_INT:
NextToken ();
/* FALL THROUGH */
default:
D->Type[0].C = T_INT;
D->Type[1].C = T_END;
break;
}
break;
case TOK_UNSIGNED:
NextToken ();
switch (CurTok.Tok) {
case TOK_CHAR:
NextToken ();
D->Type[0].C = T_UCHAR;
D->Type[1].C = T_END;
break;
case TOK_SHORT:
NextToken ();
OptionalInt ();
D->Type[0].C = T_USHORT;
D->Type[1].C = T_END;
break;
case TOK_LONG:
NextToken ();
OptionalInt ();
D->Type[0].C = T_ULONG;
D->Type[1].C = T_END;
break;
case TOK_INT:
NextToken ();
/* FALL THROUGH */
default:
D->Type[0].C = T_UINT;
D->Type[1].C = T_END;
break;
}
break;
case TOK_FLOAT:
NextToken ();
D->Type[0].C = T_FLOAT;
D->Type[1].C = T_END;
break;
case TOK_DOUBLE:
NextToken ();
D->Type[0].C = T_DOUBLE;
D->Type[1].C = T_END;
break;
case TOK_UNION:
NextToken ();
/* */
if (CurTok.Tok == TOK_IDENT) {
strcpy (Ident, CurTok.Ident);
NextToken ();
} else {
AnonName (Ident, "union");
}
/* Remember we have an extra type decl */
D->Flags |= DS_EXTRA_TYPE;
/* Declare the union in the current scope */
Entry = ParseUnionDecl (Ident);
/* Encode the union entry into the type */
D->Type[0].C = T_UNION;
SetSymEntry (D->Type, Entry);
D->Type[1].C = T_END;
break;
case TOK_STRUCT:
NextToken ();
/* */
if (CurTok.Tok == TOK_IDENT) {
strcpy (Ident, CurTok.Ident);
NextToken ();
} else {
AnonName (Ident, "struct");
}
/* Remember we have an extra type decl */
D->Flags |= DS_EXTRA_TYPE;
/* Declare the struct in the current scope */
Entry = ParseStructDecl (Ident);
/* Encode the struct entry into the type */
D->Type[0].C = T_STRUCT;
SetSymEntry (D->Type, Entry);
D->Type[1].C = T_END;
break;
case TOK_ENUM:
NextToken ();
if (CurTok.Tok != TOK_LCURLY) {
/* Named enum */
if (CurTok.Tok == TOK_IDENT) {
/* Find an entry with this name */
Entry = FindTagSym (CurTok.Ident);
if (Entry) {
if (SymIsLocal (Entry) && (Entry->Flags & SC_ENUM) == 0) {
Error ("Symbol '%s' is already different kind", Entry->Name);
}
} else {
/* Insert entry into table ### */
}
/* Skip the identifier */
NextToken ();
} else {
Error ("Identifier expected");
}
}
/* Remember we have an extra type decl */
D->Flags |= DS_EXTRA_TYPE;
/* Parse the enum decl */
ParseEnumDecl ();
D->Type[0].C = T_INT;
D->Type[1].C = T_END;
break;
case TOK_IDENT:
Entry = FindSym (CurTok.Ident);
if (Entry && SymIsTypeDef (Entry)) {
/* It's a typedef */
NextToken ();
TypeCopy (D->Type, Entry->Type);
break;
}
/* FALL THROUGH */
default:
if (Default < 0) {
Error ("Type expected");
D->Type[0].C = T_INT;
D->Type[1].C = T_END;
} else {
D->Flags |= DS_DEF_TYPE;
D->Type[0].C = (TypeCode) Default;
D->Type[1].C = T_END;
}
break;
}
/* There may also be qualifiers *after* the initial type */
D->Type[0].C |= (Qualifiers | OptionalQualifiers (T_QUAL_CONST | T_QUAL_VOLATILE));
}
static Type* ParamTypeCvt (Type* T)
/* If T is an array, convert it to a pointer else do nothing. Return the
** resulting type.
*/
{
if (IsTypeArray (T)) {
T->C = T_PTR;
}
return T;
}
static void ParseOldStyleParamList (FuncDesc* F)
/* Parse an old style (K&R) parameter list */
{
/* Some fix point tokens that are used for error recovery */
static const token_t TokenList[] = { TOK_COMMA, TOK_RPAREN, TOK_SEMI };
/* Parse params */
while (CurTok.Tok != TOK_RPAREN) {
/* List of identifiers expected */
if (CurTok.Tok == TOK_IDENT) {
/* Create a symbol table entry with type int */
AddLocalSym (CurTok.Ident, type_int, SC_AUTO | SC_PARAM | SC_DEF | SC_DEFTYPE, 0);
/* Count arguments */
++F->ParamCount;
/* Skip the identifier */
NextToken ();
} else {
/* Not a parameter name */
Error ("Identifier expected");
/* Try some smart error recovery */
SkipTokens (TokenList, sizeof(TokenList) / sizeof(TokenList[0]));
}
/* Check for more parameters */
if (CurTok.Tok == TOK_COMMA) {
NextToken ();
} else {
break;
}
}
/* Skip right paren. We must explicitly check for one here, since some of
** the breaks above bail out without checking.
*/
ConsumeRParen ();
/* An optional list of type specifications follows */
while (CurTok.Tok != TOK_LCURLY) {
DeclSpec Spec;
/* Read the declaration specifier */
ParseDeclSpec (&Spec, SC_AUTO, T_INT);
/* We accept only auto and register as storage class specifiers, but
** we ignore all this, since we use auto anyway.
*/
if ((Spec.StorageClass & SC_AUTO) == 0 &&
(Spec.StorageClass & SC_REGISTER) == 0) {
Error ("Illegal storage class");
}
/* Parse a comma separated variable list */
while (1) {
Declaration Decl;
/* Read the parameter */
ParseDecl (&Spec, &Decl, DM_NEED_IDENT);
if (Decl.Ident[0] != '\0') {
/* We have a name given. Search for the symbol */
SymEntry* Sym = FindLocalSym (Decl.Ident);
if (Sym) {
/* Check if we already changed the type for this
** parameter
*/
if (Sym->Flags & SC_DEFTYPE) {
/* Found it, change the default type to the one given */
ChangeSymType (Sym, ParamTypeCvt (Decl.Type));
/* Reset the "default type" flag */
Sym->Flags &= ~SC_DEFTYPE;
} else {
/* Type has already been changed */
Error ("Redefinition for parameter '%s'", Sym->Name);
}
} else {
Error ("Unknown identifier: '%s'", Decl.Ident);
}
}
if (CurTok.Tok == TOK_COMMA) {
NextToken ();
} else {
break;
}
}
/* Variable list must be semicolon terminated */
ConsumeSemi ();
}
}
static void ParseAnsiParamList (FuncDesc* F)
/* Parse a new style (ANSI) parameter list */
{
/* Parse params */
while (CurTok.Tok != TOK_RPAREN) {
DeclSpec Spec;
Declaration Decl;
SymEntry* Sym;
/* Allow an ellipsis as last parameter */
if (CurTok.Tok == TOK_ELLIPSIS) {
NextToken ();
F->Flags |= FD_VARIADIC;
break;
}
/* Read the declaration specifier */
ParseDeclSpec (&Spec, SC_AUTO, T_INT);
/* We accept only auto and register as storage class specifiers */
if ((Spec.StorageClass & SC_AUTO) == SC_AUTO) {
Spec.StorageClass = SC_AUTO | SC_PARAM | SC_DEF;
} else if ((Spec.StorageClass & SC_REGISTER) == SC_REGISTER) {
Spec.StorageClass = SC_REGISTER | SC_STATIC | SC_PARAM | SC_DEF;
} else {
Error ("Illegal storage class");
Spec.StorageClass = SC_AUTO | SC_PARAM | SC_DEF;
}
/* Allow parameters without a name, but remember if we had some to
** eventually print an error message later.
*/
ParseDecl (&Spec, &Decl, DM_ACCEPT_IDENT);
if (Decl.Ident[0] == '\0') {
/* Unnamed symbol. Generate a name that is not user accessible,
** then handle the symbol normal.
*/
AnonName (Decl.Ident, "param");
F->Flags |= FD_UNNAMED_PARAMS;
/* Clear defined bit on nonames */
Decl.StorageClass &= ~SC_DEF;
}
/* Parse attributes for this parameter */
ParseAttribute (&Decl);
/* Create a symbol table entry */
Sym = AddLocalSym (Decl.Ident, ParamTypeCvt (Decl.Type), Decl.StorageClass, 0);
/* Add attributes if we have any */
SymUseAttr (Sym, &Decl);
/* If the parameter is a struct or union, emit a warning */
if (IsClassStruct (Decl.Type)) {
if (IS_Get (&WarnStructParam)) {
Warning ("Passing struct by value for parameter '%s'", Decl.Ident);
}
}
/* Count arguments */
++F->ParamCount;
/* Check for more parameters */
if (CurTok.Tok == TOK_COMMA) {
NextToken ();
} else {
break;
}
}
/* Skip right paren. We must explicitly check for one here, since some of
** the breaks above bail out without checking.
*/
ConsumeRParen ();
}
static FuncDesc* ParseFuncDecl (void)
/* Parse the argument list of a function. */
{
unsigned Offs;
SymEntry* Sym;
SymEntry* WrappedCall;
unsigned char WrappedCallData;
/* Create a new function descriptor */
FuncDesc* F = NewFuncDesc ();
/* Enter a new lexical level */
EnterFunctionLevel ();
/* Check for several special parameter lists */
if (CurTok.Tok == TOK_RPAREN) {
/* Parameter list is empty */
F->Flags |= (FD_EMPTY | FD_VARIADIC);
} else if (CurTok.Tok == TOK_VOID && NextTok.Tok == TOK_RPAREN) {
/* Parameter list declared as void */
NextToken ();
F->Flags |= FD_VOID_PARAM;
} else if (CurTok.Tok == TOK_IDENT &&
(NextTok.Tok == TOK_COMMA || NextTok.Tok == TOK_RPAREN)) {
/* If the identifier is a typedef, we have a new style parameter list,
** if it's some other identifier, it's an old style parameter list.
*/
Sym = FindSym (CurTok.Ident);
if (Sym == 0 || !SymIsTypeDef (Sym)) {
/* Old style (K&R) function. */
F->Flags |= FD_OLDSTYLE;
}
}
/* Parse params */
if ((F->Flags & FD_OLDSTYLE) == 0) {
/* New style function */
ParseAnsiParamList (F);
} else {
/* Old style function */
ParseOldStyleParamList (F);
}
/* Remember the last function parameter. We need it later for several
** purposes, for example when passing stuff to fastcall functions. Since
** more symbols are added to the table, it is easier if we remember it
** now, since it is currently the last entry in the symbol table.
*/
F->LastParam = GetSymTab()->SymTail;
/* Assign offsets. If the function has a variable parameter list,
** there's one additional byte (the arg size).
*/
Offs = (F->Flags & FD_VARIADIC)? 1 : 0;
Sym = F->LastParam;
while (Sym) {
unsigned Size = CheckedSizeOf (Sym->Type);
if (SymIsRegVar (Sym)) {
Sym->V.R.SaveOffs = Offs;
} else {
Sym->V.Offs = Offs;
}
Offs += Size;
F->ParamSize += Size;
Sym = Sym->PrevSym;
}
/* Leave the lexical level remembering the symbol tables */
RememberFunctionLevel (F);
/* Did we have a WrappedCall for this function? */
GetWrappedCall((void **) &WrappedCall, &WrappedCallData);
if (WrappedCall) {
F->WrappedCall = WrappedCall;
F->WrappedCallData = WrappedCallData;
}
/* Return the function descriptor */
return F;
}
static void Declarator (const DeclSpec* Spec, Declaration* D, declmode_t Mode)
/* Recursively process declarators. Build a type array in reverse order. */
{
/* Read optional function or pointer qualifiers. They modify the
** identifier or token to the right. For convenience, we allow a calling
** convention also for pointers here. If it's a pointer-to-function, the
** qualifier later will be transfered to the function itself. If it's a
** pointer to something else, it will be flagged as an error.
*/
TypeCode Qualifiers = OptionalQualifiers (T_QUAL_ADDRSIZE | T_QUAL_CCONV);
/* Pointer to something */
if (CurTok.Tok == TOK_STAR) {
/* Skip the star */
NextToken ();
/* Allow const, restrict, and volatile qualifiers */
Qualifiers |= OptionalQualifiers (T_QUAL_CONST | T_QUAL_VOLATILE | T_QUAL_RESTRICT);
/* Parse the type that the pointer points to */
Declarator (Spec, D, Mode);
/* Add the type */
AddTypeToDeclaration (D, T_PTR | Qualifiers);
return;
}
if (CurTok.Tok == TOK_LPAREN) {
NextToken ();
Declarator (Spec, D, Mode);
ConsumeRParen ();
} else {
/* Things depend on Mode now:
** - Mode == DM_NEED_IDENT means:
** we *must* have a type and a variable identifer.
** - Mode == DM_NO_IDENT means:
** we must have a type but no variable identifer
** (if there is one, it's not read).
** - Mode == DM_ACCEPT_IDENT means:
** we *may* have an identifier. If there is an identifier,
** it is read, but it is no error, if there is none.
*/
if (Mode == DM_NO_IDENT) {
D->Ident[0] = '\0';
} else if (CurTok.Tok == TOK_IDENT) {
strcpy (D->Ident, CurTok.Ident);
NextToken ();
} else {
if (Mode == DM_NEED_IDENT) {
Error ("Identifier expected");
}
D->Ident[0] = '\0';
}
}
while (CurTok.Tok == TOK_LBRACK || CurTok.Tok == TOK_LPAREN) {
if (CurTok.Tok == TOK_LPAREN) {
/* Function declaration */
FuncDesc* F;
SymEntry* PrevEntry;
/* Skip the opening paren */
NextToken ();
/* Parse the function declaration */
F = ParseFuncDecl ();
/* We cannot specify fastcall for variadic functions */
if ((F->Flags & FD_VARIADIC) && (Qualifiers & T_QUAL_FASTCALL)) {
Error ("Variadic functions cannot be __fastcall__");
Qualifiers &= ~T_QUAL_FASTCALL;
}
/* Was there a previous entry? If so, copy WrappedCall info from it */
PrevEntry = FindGlobalSym (D->Ident);
if (PrevEntry && PrevEntry->Flags & SC_FUNC) {
FuncDesc* D = PrevEntry->V.F.Func;
if (D->WrappedCall && !F->WrappedCall) {
F->WrappedCall = D->WrappedCall;
F->WrappedCallData = D->WrappedCallData;
}
}
/* Add the function type. Be sure to bounds check the type buffer */
NeedTypeSpace (D, 1);
D->Type[D->Index].C = T_FUNC | Qualifiers;
D->Type[D->Index].A.P = F;
++D->Index;
/* Qualifiers now used */
Qualifiers = T_QUAL_NONE;
} else {
/* Array declaration. */
long Size = UNSPECIFIED;
/* We cannot have any qualifiers for an array */
if (Qualifiers != T_QUAL_NONE) {
Error ("Invalid qualifiers for array");
Qualifiers = T_QUAL_NONE;
}
/* Skip the left bracket */
NextToken ();
/* Read the size if it is given */
if (CurTok.Tok != TOK_RBRACK) {
ExprDesc Expr;
ConstAbsIntExpr (hie1, &Expr);
if (Expr.IVal <= 0) {
if (D->Ident[0] != '\0') {
Error ("Size of array '%s' is invalid", D->Ident);
} else {
Error ("Size of array is invalid");
}
Expr.IVal = 1;
}
Size = Expr.IVal;
}
/* Skip the right bracket */
ConsumeRBrack ();
/* Add the array type with the size to the type */
NeedTypeSpace (D, 1);
D->Type[D->Index].C = T_ARRAY;
D->Type[D->Index].A.L = Size;
++D->Index;
}
}
/* If we have remaining qualifiers, flag them as invalid */
if (Qualifiers & T_QUAL_NEAR) {
Error ("Invalid '__near__' qualifier");
}
if (Qualifiers & T_QUAL_FAR) {
Error ("Invalid '__far__' qualifier");
}
if (Qualifiers & T_QUAL_FASTCALL) {
Error ("Invalid '__fastcall__' qualifier");
}
if (Qualifiers & T_QUAL_CDECL) {
Error ("Invalid '__cdecl__' qualifier");
}
}
/*****************************************************************************/
/* code */
/*****************************************************************************/
Type* ParseType (Type* T)
/* Parse a complete type specification */
{
DeclSpec Spec;
Declaration Decl;
/* Get a type without a default */
InitDeclSpec (&Spec);
ParseTypeSpec (&Spec, -1, T_QUAL_NONE);
/* Parse additional declarators */
ParseDecl (&Spec, &Decl, DM_NO_IDENT);
/* Copy the type to the target buffer */
TypeCopy (T, Decl.Type);
/* Return a pointer to the target buffer */
return T;
}
void ParseDecl (const DeclSpec* Spec, Declaration* D, declmode_t Mode)
/* Parse a variable, type or function declaration */
{
/* Initialize the Declaration struct */
InitDeclaration (D);
/* Get additional declarators and the identifier */
Declarator (Spec, D, Mode);
/* Add the base type. */
NeedTypeSpace (D, TypeLen (Spec->Type) + 1); /* Bounds check */
TypeCopy (D->Type + D->Index, Spec->Type);
/* Use the storage class from the declspec */
D->StorageClass = Spec->StorageClass;
/* Do several fixes on qualifiers */
FixQualifiers (D->Type);
/* If we have a function, add a special storage class */
if (IsTypeFunc (D->Type)) {
D->StorageClass |= SC_FUNC;
}
/* Parse attributes for this declaration */
ParseAttribute (D);
/* Check several things for function or function pointer types */
if (IsTypeFunc (D->Type) || IsTypeFuncPtr (D->Type)) {
/* A function. Check the return type */
Type* RetType = GetFuncReturn (D->Type);
/* Functions may not return functions or arrays */
if (IsTypeFunc (RetType)) {
Error ("Functions are not allowed to return functions");
} else if (IsTypeArray (RetType)) {
Error ("Functions are not allowed to return arrays");
}
/* The return type must not be qualified */
if (GetQualifier (RetType) != T_QUAL_NONE && RetType[1].C == T_END) {
if (GetType (RetType) == T_TYPE_VOID) {
/* A qualified void type is always an error */
Error ("function definition has qualified void return type");
} else {
/* For others, qualifiers are ignored */
Warning ("type qualifiers ignored on function return type");
RetType[0].C = UnqualifiedType (RetType[0].C);
}
}
/* Warn about an implicit int return in the function */
if ((Spec->Flags & DS_DEF_TYPE) != 0 &&
RetType[0].C == T_INT && RetType[1].C == T_END) {
/* Function has an implicit int return. Output a warning if we don't
** have the C89 standard enabled explicitly.
*/
if (IS_Get (&Standard) >= STD_C99) {
Warning ("Implicit 'int' return type is an obsolete feature");
}
GetFuncDesc (D->Type)->Flags |= FD_OLDSTYLE_INTRET;
}
}
/* For anthing that is not a function or typedef, check for an implicit
** int declaration.
*/
if ((D->StorageClass & SC_FUNC) != SC_FUNC &&
(D->StorageClass & SC_TYPEMASK) != SC_TYPEDEF) {
/* If the standard was not set explicitly to C89, print a warning
** for variables with implicit int type.
*/
if ((Spec->Flags & DS_DEF_TYPE) != 0 && IS_Get (&Standard) >= STD_C99) {
Warning ("Implicit 'int' is an obsolete feature");
}
}
/* Check the size of the generated type */
if (!IsTypeFunc (D->Type) && !IsTypeVoid (D->Type)) {
unsigned Size = SizeOf (D->Type);
if (Size >= 0x10000) {
if (D->Ident[0] != '\0') {
Error ("Size of '%s' is invalid (0x%06X)", D->Ident, Size);
} else {
Error ("Invalid size in declaration (0x%06X)", Size);
}
}
}
}
void ParseDeclSpec (DeclSpec* D, unsigned DefStorage, long DefType)
/* Parse a declaration specification */
{
TypeCode Qualifiers;
/* Initialize the DeclSpec struct */
InitDeclSpec (D);
/* There may be qualifiers *before* the storage class specifier */
Qualifiers = OptionalQualifiers (T_QUAL_CONST | T_QUAL_VOLATILE);
/* Now get the storage class specifier for this declaration */
ParseStorageClass (D, DefStorage);
/* Parse the type specifiers passing any initial type qualifiers */
ParseTypeSpec (D, DefType, Qualifiers);
}
void CheckEmptyDecl (const DeclSpec* D)
/* Called after an empty type declaration (that is, a type declaration without
** a variable). Checks if the declaration does really make sense and issues a
** warning if not.
*/
{
if ((D->Flags & DS_EXTRA_TYPE) == 0) {
Warning ("Useless declaration");
}
}
static void SkipInitializer (unsigned BracesExpected)
/* Skip the remainder of an initializer in case of errors. Try to be somewhat
** smart so we don't have too many following errors.
*/
{
while (CurTok.Tok != TOK_CEOF && CurTok.Tok != TOK_SEMI && BracesExpected > 0) {
switch (CurTok.Tok) {
case TOK_RCURLY: --BracesExpected; break;
case TOK_LCURLY: ++BracesExpected; break;
default: break;
}
NextToken ();
}
}
static unsigned OpeningCurlyBraces (unsigned BracesNeeded)
/* Accept any number of opening curly braces around an initialization, skip
** them and return the number. If the number of curly braces is less than
** BracesNeeded, issue a warning.
*/
{
unsigned BraceCount = 0;
while (CurTok.Tok == TOK_LCURLY) {
++BraceCount;
NextToken ();
}
if (BraceCount < BracesNeeded) {
Error ("'{' expected");
}
return BraceCount;
}
static void ClosingCurlyBraces (unsigned BracesExpected)
/* Accept and skip the given number of closing curly braces together with
** an optional comma. Output an error messages, if the input does not contain
** the expected number of braces.
*/
{
while (BracesExpected) {
if (CurTok.Tok == TOK_RCURLY) {
NextToken ();
} else if (CurTok.Tok == TOK_COMMA && NextTok.Tok == TOK_RCURLY) {
NextToken ();
NextToken ();
} else {
Error ("'}' expected");
return;
}
--BracesExpected;
}
}
static void DefineData (ExprDesc* Expr)
/* Output a data definition for the given expression */
{
switch (ED_GetLoc (Expr)) {
case E_LOC_ABS:
/* Absolute: numeric address or const */
g_defdata (TypeOf (Expr->Type) | CF_CONST, Expr->IVal, 0);
break;
case E_LOC_GLOBAL:
/* Global variable */
g_defdata (CF_EXTERNAL, Expr->Name, Expr->IVal);
break;
case E_LOC_STATIC:
case E_LOC_LITERAL:
/* Static variable or literal in the literal pool */
g_defdata (CF_STATIC, Expr->Name, Expr->IVal);
break;
case E_LOC_REGISTER:
/* Register variable. Taking the address is usually not
** allowed.
*/
if (IS_Get (&AllowRegVarAddr) == 0) {
Error ("Cannot take the address of a register variable");
}
g_defdata (CF_REGVAR, Expr->Name, Expr->IVal);
break;
case E_LOC_STACK:
case E_LOC_PRIMARY:
case E_LOC_EXPR:
Error ("Non constant initializer");
break;
default:
Internal ("Unknown constant type: 0x%04X", ED_GetLoc (Expr));
}
}
static void OutputBitFieldData (StructInitData* SI)
/* Output bit field data */
{
/* Ignore if we have no data */
if (SI->ValBits > 0) {
/* Output the data */
g_defdata (CF_INT | CF_UNSIGNED | CF_CONST, SI->BitVal, 0);
/* Clear the data from SI and account for the size */
SI->BitVal = 0;
SI->ValBits = 0;
SI->Offs += SIZEOF_INT;
}
}
static void ParseScalarInitInternal (Type* T, ExprDesc* ED)
/* Parse initializaton for scalar data types. This function will not output the
** data but return it in ED.
*/
{
/* Optional opening brace */
unsigned BraceCount = OpeningCurlyBraces (0);
/* We warn if an initializer for a scalar contains braces, because this is
** quite unusual and often a sign for some problem in the input.
*/
if (BraceCount > 0) {
Warning ("Braces around scalar initializer");
}
/* Get the expression and convert it to the target type */
ConstExpr (hie1, ED);
TypeConversion (ED, T);
/* Close eventually opening braces */
ClosingCurlyBraces (BraceCount);
}
static unsigned ParseScalarInit (Type* T)
/* Parse initializaton for scalar data types. Return the number of data bytes. */
{
ExprDesc ED;
/* Parse initialization */
ParseScalarInitInternal (T, &ED);
/* Output the data */
DefineData (&ED);
/* Done */
return SizeOf (T);
}
static unsigned ParsePointerInit (Type* T)
/* Parse initializaton for pointer data types. Return the number of data bytes. */
{
/* Optional opening brace */
unsigned BraceCount = OpeningCurlyBraces (0);
/* Expression */
ExprDesc ED;
ConstExpr (hie1, &ED);
TypeConversion (&ED, T);
/* Output the data */
DefineData (&ED);
/* Close eventually opening braces */
ClosingCurlyBraces (BraceCount);
/* Done */
return SIZEOF_PTR;
}
static unsigned ParseArrayInit (Type* T, int AllowFlexibleMembers)
/* Parse initializaton for arrays. Return the number of data bytes. */
{
int Count;
/* Get the array data */
Type* ElementType = GetElementType (T);
unsigned ElementSize = CheckedSizeOf (ElementType);
long ElementCount = GetElementCount (T);
/* Special handling for a character array initialized by a literal */
if (IsTypeChar (ElementType) &&
(CurTok.Tok == TOK_SCONST || CurTok.Tok == TOK_WCSCONST ||
(CurTok.Tok == TOK_LCURLY &&
(NextTok.Tok == TOK_SCONST || NextTok.Tok == TOK_WCSCONST)))) {
/* Char array initialized by string constant */
int NeedParen;
/* If we initializer is enclosed in brackets, remember this fact and
** skip the opening bracket.
*/
NeedParen = (CurTok.Tok == TOK_LCURLY);
if (NeedParen) {
NextToken ();
}
/* Translate into target charset */
TranslateLiteral (CurTok.SVal);
/* If the array is one too small for the string literal, omit the
** trailing zero.
*/
Count = GetLiteralSize (CurTok.SVal);
if (ElementCount != UNSPECIFIED &&
ElementCount != FLEXIBLE &&
Count == ElementCount + 1) {
/* Omit the trailing zero */
--Count;
}
/* Output the data */
g_defbytes (GetLiteralStr (CurTok.SVal), Count);
/* Skip the string */
NextToken ();
/* If the initializer was enclosed in curly braces, we need a closing
** one.
*/
if (NeedParen) {
ConsumeRCurly ();
}
} else {
/* Curly brace */
ConsumeLCurly ();
/* Initialize the array members */
Count = 0;
while (CurTok.Tok != TOK_RCURLY) {
/* Flexible array members may not be initialized within
** an array (because the size of each element may differ
** otherwise).
*/
ParseInitInternal (ElementType, 0);
++Count;
if (CurTok.Tok != TOK_COMMA)
break;
NextToken ();
}
/* Closing curly braces */
ConsumeRCurly ();
}
if (ElementCount == UNSPECIFIED) {
/* Number of elements determined by initializer */
SetElementCount (T, Count);
ElementCount = Count;
} else if (ElementCount == FLEXIBLE && AllowFlexibleMembers) {
/* In non ANSI mode, allow initialization of flexible array
** members.
*/
ElementCount = Count;
} else if (Count < ElementCount) {
g_zerobytes ((ElementCount - Count) * ElementSize);
} else if (Count > ElementCount) {
Error ("Too many initializers");
}
return ElementCount * ElementSize;
}
static unsigned ParseStructInit (Type* T, int AllowFlexibleMembers)
/* Parse initialization of a struct or union. Return the number of data bytes. */
{
SymEntry* Entry;
SymTable* Tab;
StructInitData SI;
/* Consume the opening curly brace */
ConsumeLCurly ();
/* Get a pointer to the struct entry from the type */
Entry = GetSymEntry (T);
/* Get the size of the struct from the symbol table entry */
SI.Size = Entry->V.S.Size;
/* Check if this struct definition has a field table. If it doesn't, it
** is an incomplete definition.
*/
Tab = Entry->V.S.SymTab;
if (Tab == 0) {
Error ("Cannot initialize variables with incomplete type");
/* Try error recovery */
SkipInitializer (1);
/* Nothing initialized */
return 0;
}
/* Get a pointer to the list of symbols */
Entry = Tab->SymHead;
/* Initialize fields */
SI.Offs = 0;
SI.BitVal = 0;
SI.ValBits = 0;
while (CurTok.Tok != TOK_RCURLY) {
/* */
if (Entry == 0) {
Error ("Too many initializers");
SkipInitializer (1);
return SI.Offs;
}
/* Parse initialization of one field. Bit-fields need a special
** handling.
*/
if (SymIsBitField (Entry)) {
ExprDesc ED;
unsigned Val;
unsigned Shift;
/* Calculate the bitmask from the bit-field data */
unsigned Mask = (1U << Entry->V.B.BitWidth) - 1U;
/* Safety ... */
CHECK (Entry->V.B.Offs * CHAR_BITS + Entry->V.B.BitOffs ==
SI.Offs * CHAR_BITS + SI.ValBits);
/* This may be an anonymous bit-field, in which case it doesn't
** have an initializer.
*/
if (IsAnonName (Entry->Name)) {
/* Account for the data and output it if we have a full word */
SI.ValBits += Entry->V.B.BitWidth;
CHECK (SI.ValBits <= INT_BITS);
if (SI.ValBits == INT_BITS) {
OutputBitFieldData (&SI);
}
goto NextMember;
} else {
/* Read the data, check for a constant integer, do a range
** check.
*/
ParseScalarInitInternal (type_uint, &ED);
if (!ED_IsConstAbsInt (&ED)) {
Error ("Constant initializer expected");
ED_MakeConstAbsInt (&ED, 1);
}
if (ED.IVal > (long) Mask) {
Warning ("Truncating value in bit-field initializer");
ED.IVal &= (long) Mask;
}
Val = (unsigned) ED.IVal;
}
/* Add the value to the currently stored bit-field value */
Shift = (Entry->V.B.Offs - SI.Offs) * CHAR_BITS + Entry->V.B.BitOffs;
SI.BitVal |= (Val << Shift);
/* Account for the data and output it if we have a full word */
SI.ValBits += Entry->V.B.BitWidth;
CHECK (SI.ValBits <= INT_BITS);
if (SI.ValBits == INT_BITS) {
OutputBitFieldData (&SI);
}
} else {
/* Standard member. We should never have stuff from a
** bit-field left
*/
CHECK (SI.ValBits == 0);
/* Flexible array members may only be initialized if they are
** the last field (or part of the last struct field).
*/
SI.Offs += ParseInitInternal (Entry->Type, AllowFlexibleMembers && Entry->NextSym == 0);
}
/* More initializers? */
if (CurTok.Tok != TOK_COMMA) {
break;
}
/* Skip the comma */
NextToken ();
NextMember:
/* Next member. For unions, only the first one can be initialized */
if (IsTypeUnion (T)) {
/* Union */
Entry = 0;
} else {
/* Struct */
Entry = Entry->NextSym;
}
}
/* Consume the closing curly brace */
ConsumeRCurly ();
/* If we have data from a bit-field left, output it now */
OutputBitFieldData (&SI);
/* If there are struct fields left, reserve additional storage */
if (SI.Offs < SI.Size) {
g_zerobytes (SI.Size - SI.Offs);
SI.Offs = SI.Size;
}
/* Return the actual number of bytes initialized. This number may be
** larger than sizeof (Struct) if flexible array members are present and
** were initialized (possible in non ANSI mode).
*/
return SI.Offs;
}
static unsigned ParseVoidInit (Type* T)
/* Parse an initialization of a void variable (special cc65 extension).
** Return the number of bytes initialized.
*/
{
ExprDesc Expr;
unsigned Size;
/* Opening brace */
ConsumeLCurly ();
/* Allow an arbitrary list of values */
Size = 0;
do {
ConstExpr (hie1, &Expr);
switch (UnqualifiedType (Expr.Type[0].C)) {
case T_SCHAR:
case T_UCHAR:
if (ED_IsConstAbsInt (&Expr)) {
/* Make it byte sized */
Expr.IVal &= 0xFF;
}
DefineData (&Expr);
Size += SIZEOF_CHAR;
break;
case T_SHORT:
case T_USHORT:
case T_INT:
case T_UINT:
case T_PTR:
case T_ARRAY:
if (ED_IsConstAbsInt (&Expr)) {
/* Make it word sized */
Expr.IVal &= 0xFFFF;
}
DefineData (&Expr);
Size += SIZEOF_INT;
break;
case T_LONG:
case T_ULONG:
if (ED_IsConstAbsInt (&Expr)) {
/* Make it dword sized */
Expr.IVal &= 0xFFFFFFFF;
}
DefineData (&Expr);
Size += SIZEOF_LONG;
break;
default:
Error ("Illegal type in initialization");
break;
}
if (CurTok.Tok != TOK_COMMA) {
break;
}
NextToken ();
} while (CurTok.Tok != TOK_RCURLY);
/* Closing brace */
ConsumeRCurly ();
/* Number of bytes determined by initializer */
T->A.U = Size;
/* Return the number of bytes initialized */
return Size;
}
static unsigned ParseInitInternal (Type* T, int AllowFlexibleMembers)
/* Parse initialization of variables. Return the number of data bytes. */
{
switch (UnqualifiedType (T->C)) {
case T_SCHAR:
case T_UCHAR:
case T_SHORT:
case T_USHORT:
case T_INT:
case T_UINT:
case T_LONG:
case T_ULONG:
case T_FLOAT:
case T_DOUBLE:
return ParseScalarInit (T);
case T_PTR:
return ParsePointerInit (T);
case T_ARRAY:
return ParseArrayInit (T, AllowFlexibleMembers);
case T_STRUCT:
case T_UNION:
return ParseStructInit (T, AllowFlexibleMembers);
case T_VOID:
if (IS_Get (&Standard) == STD_CC65) {
/* Special cc65 extension in non-ANSI mode */
return ParseVoidInit (T);
}
/* FALLTHROUGH */
default:
Error ("Illegal type");
return SIZEOF_CHAR;
}
}
unsigned ParseInit (Type* T)
/* Parse initialization of variables. Return the number of data bytes. */
{
/* Parse the initialization. Flexible array members can only be initialized
** in cc65 mode.
*/
unsigned Size = ParseInitInternal (T, IS_Get (&Standard) == STD_CC65);
/* The initialization may not generate code on global level, because code
** outside function scope will never get executed.
*/
if (HaveGlobalCode ()) {
Error ("Non constant initializers");
RemoveGlobalCode ();
}
/* Return the size needed for the initialization */
return Size;
}
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