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cc65/src/cc65/declare.c

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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 <limits.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
/* common */
#include "addrsize.h"
#include "mmodel.h"
#include "shift.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 "staticassert.h"
#include "symtab.h"
#include "typeconv.h"
/*****************************************************************************/
/* Forwards */
/*****************************************************************************/
static void ParseTypeSpec (DeclSpec* Spec, typespec_t TSFlags);
/* Parse a type specifier */
/*****************************************************************************/
/* Internal functions */
/*****************************************************************************/
static unsigned ParseOneStorageClass (void)
/* Parse and return a storage class specifier */
{
unsigned StorageClass = 0;
/* Check the storage class given */
switch (CurTok.Tok) {
case TOK_EXTERN:
StorageClass = SC_EXTERN | SC_STATIC;
NextToken ();
break;
case TOK_STATIC:
StorageClass = SC_STATIC;
NextToken ();
break;
case TOK_REGISTER:
StorageClass = SC_REGISTER | SC_STATIC;
NextToken ();
break;
case TOK_AUTO:
StorageClass = SC_AUTO;
NextToken ();
break;
case TOK_TYPEDEF:
StorageClass = SC_TYPEDEF;
NextToken ();
break;
default:
break;
}
return StorageClass;
}
static int ParseStorageClass (DeclSpec* Spec)
/* Parse storage class specifiers. Return true if a specifier is read even if
** it was duplicated or disallowed. */
{
/* Check the storage class given */
unsigned StorageClass = ParseOneStorageClass ();
if (StorageClass == 0) {
return 0;
}
while (StorageClass != 0) {
if (Spec->StorageClass == 0) {
Spec->StorageClass = StorageClass;
} else if (Spec->StorageClass == StorageClass) {
Warning ("Duplicate storage class specifier");
} else {
Error ("Conflicting storage class specifier");
}
StorageClass = ParseOneStorageClass ();
}
return 1;
}
static void DuplicateQualifier (const char* Name)
/* Print an error message */
{
Warning ("Duplicate qualifier: '%s'", Name);
}
static TypeCode OptionalQualifiers (TypeCode Qualifiers, TypeCode Allowed)
/* Read type qualifiers if we have any. Allowed specifies the allowed
** qualifiers. Return any read qualifiers even if they caused errors.
*/
{
/* 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 (Qualifiers & T_QUAL_CONST) {
DuplicateQualifier ("const");
}
Q |= T_QUAL_CONST;
} else {
goto Done;
}
break;
case TOK_VOLATILE:
if (Allowed & T_QUAL_VOLATILE) {
if (Qualifiers & T_QUAL_VOLATILE) {
DuplicateQualifier ("volatile");
}
Q |= T_QUAL_VOLATILE;
} else {
goto Done;
}
break;
case TOK_RESTRICT:
if (Allowed & T_QUAL_RESTRICT) {
if (Qualifiers & T_QUAL_RESTRICT) {
DuplicateQualifier ("restrict");
}
Q |= T_QUAL_RESTRICT;
} else {
goto Done;
}
break;
case TOK_NEAR:
if (Allowed & T_QUAL_NEAR) {
if (Qualifiers & T_QUAL_NEAR) {
DuplicateQualifier ("near");
}
Q |= T_QUAL_NEAR;
} else {
goto Done;
}
break;
case TOK_FAR:
if (Allowed & T_QUAL_FAR) {
if (Qualifiers & T_QUAL_FAR) {
DuplicateQualifier ("far");
}
Q |= T_QUAL_FAR;
} else {
goto Done;
}
break;
case TOK_FASTCALL:
if (Allowed & T_QUAL_FASTCALL) {
if (Qualifiers & T_QUAL_FASTCALL) {
DuplicateQualifier ("fastcall");
}
Q |= T_QUAL_FASTCALL;
} else {
goto Done;
}
break;
case TOK_CDECL:
if (Allowed & T_QUAL_CDECL) {
if (Qualifiers & T_QUAL_CDECL) {
DuplicateQualifier ("cdecl");
}
Q |= T_QUAL_CDECL;
} else {
goto Done;
}
break;
default:
goto Done;
}
/* Combine with newly read qualifiers */
Qualifiers |= Q;
/* Skip the token */
NextToken ();
}
Done:
/* We cannot have more than one address size far qualifier */
switch (Qualifiers & 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");
Qualifiers &= ~T_QUAL_ADDRSIZE;
}
/* We cannot have more than one calling convention specifier */
switch (Qualifiers & 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");
Qualifiers &= ~T_QUAL_CCONV;
}
/* Return any qualifiers just read */
return Q;
}
static void OptionalSpecifiers (DeclSpec* Spec, TypeCode* Qualifiers, typespec_t TSFlags)
/* Read storage specifiers and/or type qualifiers if we have any. Storage class
** specifiers require the corresponding typespec_t flag set to be allowed, and
** only const and volatile type qualifiers are allowed under any circumstance.
** Read storage class specifiers are output in *Spec and type qualifiers are
** output in *Qualifiers with error checking.
*/
{
TypeCode Q = T_QUAL_NONE;
int Continue;
do {
/* There may be type qualifiers *before* any storage class specifiers */
Q = OptionalQualifiers (*Qualifiers, T_QUAL_CONST | T_QUAL_VOLATILE);
*Qualifiers |= Q;
/* Parse storage class specifiers anyway then check */
Continue = ParseStorageClass (Spec);
if (Continue && (TSFlags & (TS_STORAGE_CLASS_SPEC | TS_FUNCTION_SPEC)) == 0) {
Error ("Unexpected storage class specified");
}
} while (Continue || Q != T_QUAL_NONE);
}
static void OptionalInt (void)
/* Eat an optional "int" token */
{
if (CurTok.Tok == TOK_INT) {
/* Skip it */
NextToken ();
}
}
static void OptionalSigned (DeclSpec* Spec)
/* Eat an optional "signed" token */
{
if (CurTok.Tok == TOK_SIGNED) {
/* Skip it */
NextToken ();
if (Spec != NULL) {
Spec->Flags |= DS_EXPLICIT_SIGNEDNESS;
}
}
}
static void UseDefaultType (DeclSpec* Spec, typespec_t TSFlags)
/* Use the default type for the type specifier */
{
if ((TSFlags & TS_MASK_DEFAULT_TYPE) == TS_DEFAULT_TYPE_NONE) {
Spec->Flags = (Spec->Flags & ~DS_TYPE_MASK) | DS_NONE;
Spec->Type[0].C = T_INT;
Spec->Type[1].C = T_END;
} else {
Spec->Flags = (Spec->Flags & ~DS_TYPE_MASK) | DS_DEF_TYPE;
Spec->Type[0].C = T_INT;
Spec->Type[1].C = T_END;
}
}
static void InitDeclSpec (DeclSpec* Spec)
/* Initialize the DeclSpec struct for use */
{
Spec->StorageClass = 0;
Spec->Type[0].C = T_END;
Spec->Flags = 0;
}
static void InitDeclarator (Declarator* D)
/* Initialize the Declarator struct for use */
{
D->Ident[0] = '\0';
D->Type[0].C = T_END;
D->Index = 0;
D->Attributes = 0;
}
static void NeedTypeSpace (Declarator* 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 AddTypeCodeToDeclarator (Declarator* D, TypeCode T)
/* Add a type specifier to the type of a declarator */
{
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 = GetUnqualRawTypeCode (T);
} 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 FixFunctionReturnType (Type* T)
/* Check if the data type consists of any functions returning forbidden return
** types and remove qualifiers from the return types if they are not void.
*/
{
while (T->C != T_END) {
if (IsTypeFunc (T)) {
++T;
/* Functions may not return functions or arrays */
if (IsTypeFunc (T)) {
Error ("Functions are not allowed to return functions");
} else if (IsTypeArray (T)) {
Error ("Functions are not allowed to return arrays");
}
/* The return type must not be qualified */
if ((GetQualifier (T) & T_QUAL_CVR) != T_QUAL_NONE) {
/* We are stricter than the standard here */
if (GetRawTypeRank (T) == T_RANK_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");
T[0].C &= ~T_QUAL_CVR;
}
}
} else {
++T;
}
}
}
static void CheckArrayElementType (const Type* T)
/* Check recursively if type consists of arrays of forbidden element types */
{
while (T->C != T_END) {
if (IsTypeArray (T)) {
/* If the array is multi-dimensional, keep going until we get the
** true element type.
*/
++T;
if (SizeOf (T) == 0) {
if (IsTypeArray (T) || IsIncompleteESUType (T)) {
/* We cannot have an array of incomplete elements */
if (!IsTypeArray (T) || GetElementCount (T) == UNSPECIFIED) {
Error ("Array of incomplete element type '%s'",
GetFullTypeName (T));
return;
}
} else if (!IsTypeVoid (T) || IS_Get (&Standard) != STD_CC65) {
/* We could support certain 0-size element types as an extension */
Error ("Array of 0-size element type '%s'",
GetFullTypeName (T));
return;
}
} else {
/* Elements cannot contain flexible array members themselves */
if (IsClassStruct (T)) {
SymEntry* TagEntry = GetESUTagSym (T);
if (TagEntry && SymHasFlexibleArrayMember (TagEntry)) {
Error ("Invalid use of struct with flexible array member");
return;
}
}
}
} else {
++T;
}
}
}
static SymEntry* ForwardESU (const char* Name, unsigned Flags, unsigned* DSFlags)
/* Handle an enum, struct or union forward declaration */
{
/* Try to find an enum/struct/union with the given name. If there is none,
** insert a forward declaration into the current lexical level.
*/
SymEntry* TagEntry = FindTagSym (Name);
if (TagEntry == 0) {
if ((Flags & SC_ESUTYPEMASK) != SC_ENUM) {
TagEntry = AddStructSym (Name, Flags, 0, 0, DSFlags);
} else {
TagEntry = AddEnumSym (Name, Flags, 0, 0, DSFlags);
}
} else if ((TagEntry->Flags & SC_TYPEMASK) != (Flags & SC_ESUTYPEMASK)) {
/* Already defined, but not the same type class */
Error ("Symbol '%s' is already different kind", Name);
}
return TagEntry;
}
static const Type* GetEnumeratorType (long Min, unsigned long Max, int Signed)
/* GitHub #1093 - We use unsigned types to save spaces whenever possible.
** If both the signed and unsigned integer types of the same minimum size
** capable of representing all values of the enum, we prefer the unsigned
** one.
** Return 0 if impossible to represent Min and Max as the same integer type.
*/
{
const Type* Underlying = type_int; /* default type */
/* Change the underlying type if necessary */
if (Min < 0 || Signed) {
/* We can't use unsigned types if there are any negative values */
if (Max > (unsigned long)INT32_MAX) {
/* No way to represent both Min and Max as the same integer type */
Underlying = 0;
} else if (Min < INT16_MIN || Max > (unsigned long)INT16_MAX) {
Underlying = type_long;
} else if (Min < INT8_MIN || Max > (unsigned long)INT8_MAX) {
Underlying = type_int;
} else {
Underlying = type_schar;
}
} else {
if (Max > UINT16_MAX) {
Underlying = type_ulong;
} else if (Max > UINT8_MAX) {
Underlying = type_uint;
} else {
Underlying = type_uchar;
}
}
return Underlying;
}
static SymEntry* ParseEnumSpec (const char* Name, unsigned* DSFlags)
/* Process an enum specifier */
{
SymTable* FieldTab;
long EnumVal;
int IsSigned;
int IsIncremented;
ident Ident;
long MinConstant = 0;
unsigned long MaxConstant = 0;
const Type* NewType = 0; /* new member type */
const Type* MemberType = type_int; /* default member type */
unsigned Flags = 0;
unsigned PrevErrorCount = ErrorCount;
if (CurTok.Tok != TOK_LCURLY) {
/* Just a forward definition */
return ForwardESU (Name, SC_ENUM, DSFlags);
}
/* Add a forward declaration for the enum tag in the current lexical level */
AddEnumSym (Name, 0, 0, 0, DSFlags);
/* Skip the opening curly brace */
NextToken ();
/* Read the enum tags */
EnumVal = -1L;
while (CurTok.Tok != TOK_RCURLY) {
/* We expect an identifier */
if (CurTok.Tok != TOK_IDENT) {
Error ("Identifier expected for enumerator declarator");
/* Avoid excessive errors */
NextToken ();
continue;
}
/* Remember the identifier and skip it */
strcpy (Ident, CurTok.Ident);
NextToken ();
/* Check for an assigned value */
if (CurTok.Tok == TOK_ASSIGN) {
NextToken ();
ExprDesc Expr = NoCodeConstAbsIntExpr (hie1);
EnumVal = Expr.IVal;
MemberType = Expr.Type;
IsSigned = IsSignSigned (MemberType);
IsIncremented = 0;
} else {
/* Defaulted with the same signedness as the previous member's */
IsSigned = IsSignSigned (MemberType) &&
(unsigned long)EnumVal != GetIntegerTypeMax (MemberType);
/* Enumerate by adding one to the previous value */
EnumVal = (long)(((unsigned long)EnumVal + 1UL) & 0xFFFFFFFFUL);
if (GetUnqualRawTypeCode (MemberType) == T_ULONG && EnumVal == 0) {
/* Error since the new value cannot be represented in the
** largest unsigned integer type supported by cc65 for enum.
*/
Error ("Enumerator '%s' overflows the range of '%s'",
Ident,
GetBasicTypeName (type_ulong));
}
IsIncremented = 1;
}
/* Track down the min/max values and evaluate the type of EnumVal
** using GetEnumeratorType in a tricky way.
*/
if (!IsSigned || EnumVal >= 0) {
if ((unsigned long)EnumVal > MaxConstant) {
MaxConstant = (unsigned long)EnumVal;
}
NewType = GetEnumeratorType (0, EnumVal, IsSigned);
} else {
if (EnumVal < MinConstant) {
MinConstant = EnumVal;
}
NewType = GetEnumeratorType (EnumVal, 0, 1);
}
/* GetEnumeratorType above should never fail, but just in case */
if (NewType == 0) {
Internal ("Unexpected failure with GetEnumeratorType: %lx", EnumVal);
NewType = type_ulong;
} else if (SizeOf (NewType) < SizeOf (type_int)) {
/* Integer constants are not shorter than int */
NewType = type_int;
}
/* Warn if the incremented value exceeds the range of the previous
** type.
*/
if (PrevErrorCount == ErrorCount &&
IsIncremented &&
(!IsSigned || EnumVal >= 0) &&
NewType->C != GetUnqualRawTypeCode (MemberType)) {
/* The possible overflow here can only be when EnumVal > 0 */
Warning ("Enumerator '%s' (value = %lu) implies type '%s'",
Ident,
(unsigned long)EnumVal,
GetBasicTypeName (NewType));
}
/* Warn if the value exceeds range of 'int' in standard mode */
if (IS_Get (&Standard) != STD_CC65 && NewType->C != T_INT) {
if (!IsSigned || EnumVal >= 0) {
Warning ("ISO C restricts enumerator values to range of 'int'\n"
"\tEnumerator '%s' (value = %lu) is too large",
Ident,
(unsigned long)EnumVal);
} else {
Warning ("ISO C restricts enumerator values to range of 'int'\n"
"\tEnumerator '%s' (value = %ld) is too small",
Ident,
EnumVal);
}
}
/* Add an entry of the enumerator to the symbol table */
AddConstSym (Ident, NewType, SC_ENUMERATOR | SC_CONST, EnumVal);
/* Use this type for following members */
MemberType = NewType;
/* Check for end of definition */
if (CurTok.Tok != TOK_COMMA) {
break;
}
NextToken ();
}
ConsumeRCurly ();
/* Check if there have been any members. Error if none */
if (NewType == 0) {
Error ("Empty enum is invalid");
}
/* This evaluates the underlying type of the whole enum */
MemberType = GetEnumeratorType (MinConstant, MaxConstant, 0);
if (MemberType == 0) {
/* It is very likely that the program is wrong */
Error ("Enumeration values cannot be represented all as 'long'\n"
"\tMin enumerator value = %ld, Max enumerator value = %lu",
MinConstant, MaxConstant);
/* Avoid more errors */
MemberType = type_long;
}
FieldTab = GetSymTab ();
/* Return a fictitious symbol if errors occurred during parsing */
if (PrevErrorCount != ErrorCount) {
Flags |= SC_FICTITIOUS;
}
return AddEnumSym (Name, SC_DEF | Flags, MemberType, FieldTab, DSFlags);
}
static int ParseFieldWidth (Declarator* D)
/* Parse an optional field width. Returns -1 if no field width is specified,
** otherwise the width of the field.
*/
{
if (CurTok.Tok != TOK_COLON) {
/* No bit-field declaration */
return -1;
}
if (!IsClassInt (D->Type)) {
/* Only integer types may be used for bit-fields */
Error ("Bit-field has invalid type '%s', must be integral",
GetBasicTypeName (D->Type));
/* Avoid a diagnostic storm by giving the bit-field the widest valid
** signed type, and continuing to parse.
*/
D->Type[0].C = T_INT;
}
/* We currently support integral types up to long */
if (SizeOf (D->Type) > SizeOf (type_ulong)) {
/* Only long-sized or smaller types may be used for bit-fields, for now */
Error ("cc65 currently supports only long-sized and smaller bit-field types");
/* Avoid a diagnostic storm */
D->Type[0].C = T_INT;
}
/* Read the width */
NextToken ();
ExprDesc Expr = NoCodeConstAbsIntExpr (hie1);
if (Expr.IVal < 0) {
Error ("Negative width in bit-field");
return -1;
}
if (Expr.IVal > (long)(SizeOf (D->Type) * CHAR_BITS)) {
Error ("Width of bit-field exceeds its type");
return -1;
}
if (Expr.IVal == 0 && D->Ident[0] != '\0') {
Error ("Zero width for named bit-field");
return -1;
}
/* Return the field width */
return (int) Expr.IVal;
}
static unsigned PadWithBitField (unsigned StructSize, unsigned BitOffs)
/* Pad the current struct with an anonymous bit-field aligned to the next byte.
** Return how many bits are used to pad.
*/
{
/* MSVC complains about unary negation of unsigned,
** so it has been rewritten as subtraction.
*/
unsigned PaddingBits = (0 - BitOffs) % CHAR_BITS;
/* We need an anonymous name */
ident Ident;
AnonName (Ident, "bit-field");
/* Add an anonymous bit-field that aligns to the next
** byte.
*/
AddBitField (Ident, type_uchar, StructSize, BitOffs, PaddingBits,
/*SignednessSpecified=*/1);
return PaddingBits;
}
static unsigned AliasAnonStructFields (const Declarator* D, SymEntry* Anon)
/* Create alias fields from an anon union/struct in the current lexical level.
** The function returns the count of created aliases.
*/
{
unsigned Count = 0;
SymEntry* Field;
SymEntry* Alias;
/* Get the symbol table containing the fields. If it is empty, there has
** been an error before, so bail out.
*/
SymTable* Tab = GetESUTagSym (D->Type)->V.S.SymTab;
if (Tab == 0) {
/* Incomplete definition - has been flagged before */
return 0;
}
/* Get a pointer to the list of symbols. Then walk the list adding copies
** of the embedded struct to the current level.
*/
Field = Tab->SymHead;
while (Field) {
/* Enter an alias of this symbol */
if (!IsAnonName (Field->Name)) {
Alias = AddLocalSym (Field->Name, Field->Type, SC_STRUCTFIELD|SC_ALIAS, 0);
Alias->V.A.Field = Field;
Alias->V.A.Offs = Anon->V.Offs + Field->V.Offs;
++Count;
}
/* Currently, there can not be any attributes, but if there will be
** some in the future, we want to know this.
*/
CHECK (Field->Attr == 0);
/* Next entry */
Field = Field->NextSym;
}
/* Return the count of created aliases */
return Count;
}
static SymEntry* ParseUnionSpec (const char* Name, unsigned* DSFlags)
/* Parse a union specifier */
{
unsigned UnionSize;
unsigned FieldSize;
int FieldWidth; /* Width in bits, -1 if not a bit-field */
SymTable* FieldTab;
SymEntry* UnionTagEntry;
SymEntry* Field;
unsigned Flags = 0;
unsigned PrevErrorCount = ErrorCount;
if (CurTok.Tok != TOK_LCURLY) {
/* Just a forward declaration */
return ForwardESU (Name, SC_UNION, DSFlags);
}
/* Add a forward declaration for the union tag in the current lexical level */
UnionTagEntry = AddStructSym (Name, SC_UNION, 0, 0, DSFlags);
UnionTagEntry->V.S.ACount = 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;
int NeedClean = 0;
/* Check for extra semicolons */
if (CurTok.Tok == TOK_SEMI) {
/* TODO: warn on this if we have a pedantic mode */
NextToken ();
continue;
}
/* Check for a _Static_assert */
if (CurTok.Tok == TOK_STATIC_ASSERT) {
ParseStaticAssert ();
continue;
}
InitDeclSpec (&Spec);
ParseTypeSpec (&Spec, TS_DEFAULT_TYPE_NONE);
/* Check if this is only a type declaration */
if (CurTok.Tok == TOK_SEMI && (Spec.Flags & DS_EXTRA_TYPE) == 0) {
CheckEmptyDecl (&Spec);
NextToken ();
continue;
}
/* If we haven't got a type specifier yet, something must be wrong */
if ((Spec.Flags & DS_TYPE_MASK) == DS_NONE) {
/* Avoid extra errors if it was a failed type specifier */
if ((Spec.Flags & DS_EXTRA_TYPE) == 0) {
Error ("Declaration specifier expected");
}
NeedClean = -1;
goto EndOfDecl;
}
/* Allow anonymous bit-fields */
Spec.Flags |= DS_ALLOW_BITFIELD;
/* Read fields with this type */
while (1) {
Declarator Decl;
/* Get type and name of the struct field */
NeedClean = ParseDecl (&Spec, &Decl, DM_IDENT_OR_EMPTY);
/* Bail out if there are errors */
if (NeedClean <= 0) {
break;
}
/* Check for a bit-field declaration */
FieldWidth = ParseFieldWidth (&Decl);
/* Check for fields without names */
if (Decl.Ident[0] == '\0') {
if (FieldWidth < 0) {
/* In cc65 mode, we allow anonymous structs/unions within
** a union.
*/
SymEntry* TagEntry;
if (IS_Get (&Standard) >= STD_CC65 &&
IsClassStruct (Decl.Type) &&
(TagEntry = GetESUTagSym (Decl.Type)) &&
SymHasAnonName (TagEntry)) {
/* This is an anonymous struct or union */
AnonFieldName (Decl.Ident, GetBasicTypeName (Decl.Type), UnionTagEntry->V.S.ACount);
/* Ignore CVR qualifiers */
if (IsQualConst (Decl.Type) || IsQualVolatile (Decl.Type) || IsQualRestrict (Decl.Type)) {
Warning ("Anonymous %s qualifiers are ignored", GetBasicTypeName (Decl.Type));
Decl.Type[0].C &= ~T_QUAL_CVR;
}
} else {
/* Invalid member */
goto NextMember;
}
} else if (FieldWidth > 0) {
/* A bit-field without a name will get an anonymous one */
AnonName (Decl.Ident, "bit-field");
}
} else if (IsIncompleteType (Decl.Type)) {
Error ("Field '%s' has incomplete type '%s'",
Decl.Ident,
GetFullTypeName (Decl.Type));
}
/* Check for const types */
if (IsQualConst (Decl.Type)) {
Flags |= SC_HAVECONST;
}
/* Ignore zero sized bit fields in a union */
if (FieldWidth == 0) {
goto NextMember;
}
/* Handle sizes */
FieldSize = SizeOf (Decl.Type);
if (FieldSize > UnionSize) {
UnionSize = FieldSize;
}
/* Add a field entry to the table */
if (FieldWidth > 0) {
/* For a union, allocate space for the type specified by the
** bit-field.
*/
AddBitField (Decl.Ident, Decl.Type, 0, 0, FieldWidth,
(Spec.Flags & DS_EXPLICIT_SIGNEDNESS) != 0);
} else if (Decl.Ident[0] != '\0') {
/* Add the new field to the table */
Field = AddLocalSym (Decl.Ident, Decl.Type, SC_STRUCTFIELD, 0);
/* Check the new field for certain kinds of members */
if (IsClassStruct (Decl.Type)) {
SymEntry* TagEntry = GetESUTagSym (Decl.Type);
/* Alias the fields of the anonymous member on the current level */
if (IsAnonName (Decl.Ident)) {
Field->V.A.ANumber = UnionTagEntry->V.S.ACount++;
AliasAnonStructFields (&Decl, Field);
}
/* Check if the field itself has a flexible array member */
if (TagEntry && SymHasFlexibleArrayMember (TagEntry)) {
Field->Flags |= SC_HAVEFAM;
Flags |= SC_HAVEFAM;
}
/* Check if the field itself has a const member */
if (TagEntry && SymHasConstMember (TagEntry)) {
Field->Flags |= SC_HAVECONST;
Flags |= SC_HAVECONST;
}
}
}
NextMember:
/* Check for end of declaration list */
if (CurTok.Tok != TOK_COMMA) {
break;
}
Spec.Flags |= DS_NO_EMPTY_DECL;
NextToken ();
}
EndOfDecl:
if (NeedClean > 0) {
/* Must be followed by a semicolon */
if (ConsumeSemi ()) {
NeedClean = 0;
} else {
NeedClean = -1;
}
}
/* Try some smart error recovery */
if (NeedClean < 0) {
SmartErrorSkip (1);
}
}
/* Skip the closing brace */
NextToken ();
/* Remember the symbol table and leave the struct level */
FieldTab = GetFieldSymTab ();
LeaveStructLevel ();
/* Return a fictitious symbol if errors occurred during parsing */
if (PrevErrorCount != ErrorCount) {
Flags |= SC_FICTITIOUS;
}
/* Make a real entry from the forward decl and return it */
return AddStructSym (Name, SC_UNION | SC_DEF | Flags, UnionSize, FieldTab, DSFlags);
}
static SymEntry* ParseStructSpec (const char* Name, unsigned* DSFlags)
/* Parse a struct specifier */
{
unsigned StructSize;
int FlexibleMember;
unsigned BitOffs; /* Bit offset for bit-fields */
int FieldWidth; /* Width in bits, -1 if not a bit-field */
SymTable* FieldTab;
SymEntry* StructTagEntry;
SymEntry* Field;
unsigned Flags = 0;
unsigned PrevErrorCount = ErrorCount;
if (CurTok.Tok != TOK_LCURLY) {
/* Just a forward declaration */
return ForwardESU (Name, SC_STRUCT, DSFlags);
}
/* Add a forward declaration for the struct tag in the current lexical level */
StructTagEntry = AddStructSym (Name, SC_STRUCT, 0, 0, DSFlags);
StructTagEntry->V.S.ACount = 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;
int NeedClean = 0;
/* Check for extra semicolons */
if (CurTok.Tok == TOK_SEMI) {
/* TODO: warn on this if we have a pedantic mode */
NextToken ();
continue;
}
/* Check for a _Static_assert */
if (CurTok.Tok == TOK_STATIC_ASSERT) {
ParseStaticAssert ();
continue;
}
InitDeclSpec (&Spec);
ParseTypeSpec (&Spec, TS_DEFAULT_TYPE_NONE);
/* Check if this is only a type declaration */
if (CurTok.Tok == TOK_SEMI && (Spec.Flags & DS_EXTRA_TYPE) == 0) {
CheckEmptyDecl (&Spec);
NextToken ();
continue;
}
/* If we haven't got a type specifier yet, something must be wrong */
if ((Spec.Flags & DS_TYPE_MASK) == DS_NONE) {
/* Avoid extra errors if it was a failed type specifier */
if ((Spec.Flags & DS_EXTRA_TYPE) == 0) {
Error ("Declaration specifier expected");
}
NeedClean = -1;
goto EndOfDecl;
}
/* Allow anonymous bit-fields */
Spec.Flags |= DS_ALLOW_BITFIELD;
/* Read fields with this type */
while (1) {
Declarator Decl;
/* 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 */
NeedClean = ParseDecl (&Spec, &Decl, DM_IDENT_OR_EMPTY);
/* Bail out if there are errors */
if (NeedClean <= 0) {
break;
}
/* 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 allocated unit, 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) > CHAR_BITS * SizeOf (Decl.Type)) {
/* Add an anonymous bit-field that aligns to the next
** byte.
*/
unsigned PaddingBits = PadWithBitField (StructSize, BitOffs);
/* No bits left */
StructSize += (BitOffs + PaddingBits) / CHAR_BITS;
BitOffs = 0;
}
}
/* Check for fields without names */
if (Decl.Ident[0] == '\0') {
if (FieldWidth < 0) {
/* In cc65 mode, we allow anonymous structs/unions within
** a struct.
*/
SymEntry* TagEntry;
if (IS_Get (&Standard) >= STD_CC65 &&
IsClassStruct (Decl.Type) &&
(TagEntry = GetESUTagSym (Decl.Type)) &&
SymHasAnonName (TagEntry)) {
/* This is an anonymous struct or union */
AnonFieldName (Decl.Ident, GetBasicTypeName (Decl.Type), StructTagEntry->V.S.ACount);
/* Ignore CVR qualifiers */
if (IsQualConst (Decl.Type) || IsQualVolatile (Decl.Type) || IsQualRestrict (Decl.Type)) {
Warning ("Anonymous %s qualifiers are ignored", GetBasicTypeName (Decl.Type));
Decl.Type[0].C &= ~T_QUAL_CVR;
}
} else {
/* Invalid member */
goto NextMember;
}
} else if (FieldWidth > 0) {
/* A bit-field without a name will get an anonymous one */
AnonName (Decl.Ident, "bit-field");
}
} else {
/* 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;
Flags |= SC_HAVEFAM;
/* Assume zero for size calculations */
SetElementCount (Decl.Type, FLEXIBLE);
}
if (IsIncompleteType (Decl.Type)) {
Error ("Field '%s' has incomplete type '%s'",
Decl.Ident,
GetFullTypeName (Decl.Type));
}
}
/* Check for const types */
if (IsQualConst (Decl.Type)) {
Flags |= SC_HAVECONST;
}
/* Apart from the above, a bit field with width 0 is not processed
** further.
*/
if (FieldWidth == 0) {
goto NextMember;
}
/* Add a field entry to the table */
if (FieldWidth > 0) {
/* Full bytes have already been added to the StructSize,
** which is passed to the offset of AddBitField. BitOffs
** is always within a char, which simplifies handling the
** bit-field as a char type in expressions.
*/
CHECK (BitOffs < CHAR_BITS);
AddBitField (Decl.Ident, Decl.Type, StructSize, BitOffs, FieldWidth,
(Spec.Flags & DS_EXPLICIT_SIGNEDNESS) != 0);
BitOffs += FieldWidth;
CHECK (BitOffs <= CHAR_BITS * SizeOf (Decl.Type));
/* Add any full bytes to the struct size */
StructSize += BitOffs / CHAR_BITS;
BitOffs %= CHAR_BITS;
} else if (Decl.Ident[0] != '\0') {
/* Add the new field to the table */
Field = AddLocalSym (Decl.Ident, Decl.Type, SC_STRUCTFIELD, StructSize);
/* Check the new field for certain kinds of members */
if (IsClassStruct (Decl.Type)) {
SymEntry* TagEntry = GetESUTagSym (Decl.Type);
/* Alias the fields of the anonymous member on the current level */
if (IsAnonName (Decl.Ident)) {
Field->V.A.ANumber = StructTagEntry->V.S.ACount++;
AliasAnonStructFields (&Decl, Field);
}
/* Check if the field itself has a flexible array member */
if (TagEntry && SymHasFlexibleArrayMember (TagEntry)) {
Field->Flags |= SC_HAVEFAM;
Flags |= SC_HAVEFAM;
Error ("Invalid use of struct with flexible array member");
}
/* Check if the field itself has a const member */
if (TagEntry && SymHasConstMember (TagEntry)) {
Field->Flags |= SC_HAVECONST;
Flags |= SC_HAVECONST;
}
}
if (!FlexibleMember) {
StructSize += SizeOf (Decl.Type);
}
}
NextMember:
/* Check for end of declaration list */
if (CurTok.Tok != TOK_COMMA) {
break;
}
Spec.Flags |= DS_NO_EMPTY_DECL;
NextToken ();
}
EndOfDecl:
if (NeedClean > 0) {
/* Must be followed by a semicolon */
if (ConsumeSemi ()) {
NeedClean = 0;
} else {
NeedClean = -1;
}
}
/* Try some smart error recovery */
if (NeedClean < 0) {
SmartErrorSkip (1);
}
}
if (BitOffs > 0) {
/* If we have bits from bit-fields left, pad the struct to next byte */
unsigned PaddingBits = PadWithBitField (StructSize, BitOffs);
/* No bits left */
StructSize += (BitOffs + PaddingBits) / CHAR_BITS;
}
/* Skip the closing brace */
NextToken ();
/* Remember the symbol table and leave the struct level */
FieldTab = GetFieldSymTab ();
LeaveStructLevel ();
/* Return a fictitious symbol if errors occurred during parsing */
if (PrevErrorCount != ErrorCount) {
Flags |= SC_FICTITIOUS;
}
/* Make a real entry from the forward decl and return it */
return AddStructSym (Name, SC_STRUCT | SC_DEF | Flags, StructSize, FieldTab, DSFlags);
}
static void ParseTypeSpec (DeclSpec* Spec, typespec_t TSFlags)
/* Parse a type specifier. Store whether one of "signed" or "unsigned" was
** specified, so bit-fields of unspecified signedness can be treated as
** unsigned; without special handling, it would be treated as signed.
*/
{
ident Ident;
SymEntry* TagEntry;
TypeCode Qualifiers = T_QUAL_NONE;
/* Assume we have an explicitly specified type */
Spec->Flags = (Spec->Flags & ~DS_TYPE_MASK) | DS_EXPLICIT_TYPE;
/* Read storage specifiers and/or type qualifiers if we have any */
OptionalSpecifiers (Spec, &Qualifiers, TSFlags);
/* Look at the data type */
switch (CurTok.Tok) {
case TOK_VOID:
NextToken ();
Spec->Type[0].C = T_VOID;
Spec->Type[0].A.U = 0;
Spec->Type[1].C = T_END;
break;
case TOK_CHAR:
NextToken ();
Spec->Type[0].C = T_CHAR;
Spec->Type[1].C = T_END;
break;
case TOK_LONG:
NextToken ();
if (CurTok.Tok == TOK_UNSIGNED) {
Spec->Flags |= DS_EXPLICIT_SIGNEDNESS;
NextToken ();
OptionalInt ();
Spec->Type[0].C = T_ULONG;
Spec->Type[1].C = T_END;
} else {
OptionalSigned (Spec);
OptionalInt ();
Spec->Type[0].C = T_LONG;
Spec->Type[1].C = T_END;
}
break;
case TOK_SHORT:
NextToken ();
if (CurTok.Tok == TOK_UNSIGNED) {
Spec->Flags |= DS_EXPLICIT_SIGNEDNESS;
NextToken ();
OptionalInt ();
Spec->Type[0].C = T_USHORT;
Spec->Type[1].C = T_END;
} else {
OptionalSigned (Spec);
OptionalInt ();
Spec->Type[0].C = T_SHORT;
Spec->Type[1].C = T_END;
}
break;
case TOK_INT:
NextToken ();
Spec->Type[0].C = T_INT;
Spec->Type[1].C = T_END;
break;
case TOK_SIGNED:
Spec->Flags |= DS_EXPLICIT_SIGNEDNESS;
NextToken ();
switch (CurTok.Tok) {
case TOK_CHAR:
NextToken ();
Spec->Type[0].C = T_SCHAR;
Spec->Type[1].C = T_END;
break;
case TOK_SHORT:
NextToken ();
OptionalInt ();
Spec->Type[0].C = T_SHORT;
Spec->Type[1].C = T_END;
break;
case TOK_LONG:
NextToken ();
OptionalInt ();
Spec->Type[0].C = T_LONG;
Spec->Type[1].C = T_END;
break;
case TOK_INT:
NextToken ();
/* FALL THROUGH */
default:
Spec->Type[0].C = T_INT;
Spec->Type[1].C = T_END;
break;
}
break;
case TOK_UNSIGNED:
Spec->Flags |= DS_EXPLICIT_SIGNEDNESS;
NextToken ();
switch (CurTok.Tok) {
case TOK_CHAR:
NextToken ();
Spec->Type[0].C = T_UCHAR;
Spec->Type[1].C = T_END;
break;
case TOK_SHORT:
NextToken ();
OptionalInt ();
Spec->Type[0].C = T_USHORT;
Spec->Type[1].C = T_END;
break;
case TOK_LONG:
NextToken ();
OptionalInt ();
Spec->Type[0].C = T_ULONG;
Spec->Type[1].C = T_END;
break;
case TOK_INT:
NextToken ();
/* FALL THROUGH */
default:
Spec->Type[0].C = T_UINT;
Spec->Type[1].C = T_END;
break;
}
break;
case TOK_FLOAT:
NextToken ();
Spec->Type[0].C = T_FLOAT;
Spec->Type[1].C = T_END;
break;
case TOK_DOUBLE:
NextToken ();
Spec->Type[0].C = T_DOUBLE;
Spec->Type[1].C = T_END;
break;
case TOK_UNION:
NextToken ();
/* Remember we have an extra type decl */
Spec->Flags |= DS_EXTRA_TYPE;
/* Check for tag name */
if (CurTok.Tok == TOK_IDENT) {
strcpy (Ident, CurTok.Ident);
NextToken ();
} else if (CurTok.Tok == TOK_LCURLY) {
AnonName (Ident, "union");
} else {
Error ("Tag name identifier or '{' expected");
UseDefaultType (Spec, TS_DEFAULT_TYPE_NONE);
break;
}
/* Declare the union in the current scope */
TagEntry = ParseUnionSpec (Ident, &Spec->Flags);
/* Encode the union entry into the type */
Spec->Type[0].C = T_UNION;
SetESUTagSym (Spec->Type, TagEntry);
Spec->Type[1].C = T_END;
break;
case TOK_STRUCT:
NextToken ();
/* Remember we have an extra type decl */
Spec->Flags |= DS_EXTRA_TYPE;
/* Check for tag name */
if (CurTok.Tok == TOK_IDENT) {
strcpy (Ident, CurTok.Ident);
NextToken ();
} else if (CurTok.Tok == TOK_LCURLY) {
AnonName (Ident, "struct");
} else {
Error ("Tag name identifier or '{' expected");
UseDefaultType (Spec, TS_DEFAULT_TYPE_NONE);
break;
}
/* Declare the struct in the current scope */
TagEntry = ParseStructSpec (Ident, &Spec->Flags);
/* Encode the struct entry into the type */
Spec->Type[0].C = T_STRUCT;
SetESUTagSym (Spec->Type, TagEntry);
Spec->Type[1].C = T_END;
break;
case TOK_ENUM:
NextToken ();
/* Remember we have an extra type decl */
Spec->Flags |= DS_EXTRA_TYPE;
/* Check for tag name */
if (CurTok.Tok == TOK_IDENT) {
strcpy (Ident, CurTok.Ident);
NextToken ();
} else if (CurTok.Tok == TOK_LCURLY) {
AnonName (Ident, "enum");
} else {
Error ("Tag name identifier or '{' expected");
UseDefaultType (Spec, TS_DEFAULT_TYPE_NONE);
break;
}
/* Parse the enum decl */
TagEntry = ParseEnumSpec (Ident, &Spec->Flags);
/* Encode the enum entry into the type */
Spec->Type[0].C |= T_ENUM;
SetESUTagSym (Spec->Type, TagEntry);
Spec->Type[1].C = T_END;
/* The signedness of enums is determined by the type, so say this is specified to avoid
** the int -> unsigned int handling for plain int bit-fields in AddBitField.
*/
Spec->Flags |= DS_EXPLICIT_SIGNEDNESS;
break;
case TOK_IDENT:
/* This could be a label */
if (NextTok.Tok != TOK_COLON || GetLexicalLevel () == LEX_LEVEL_STRUCT) {
TagEntry = FindSym (CurTok.Ident);
if (TagEntry && SymIsTypeDef (TagEntry)) {
/* It's a typedef */
NextToken ();
TypeCopy (Spec->Type, TagEntry->Type);
/* If it's a typedef, we should actually use whether the signedness was
** specified on the typedef, but that information has been lost. Treat the
** signedness as being specified to work around the ICE in #1267.
** Unforunately, this will cause plain int bit-fields defined via typedefs
** to be treated as signed rather than unsigned.
*/
Spec->Flags |= DS_EXPLICIT_SIGNEDNESS;
break;
} else if ((TSFlags & TS_MASK_DEFAULT_TYPE) == TS_DEFAULT_TYPE_NONE) {
/* Treat this identifier as an unknown type */
Error ("Unknown type name '%s'", CurTok.Ident);
TypeCopy (Spec->Type, type_int);
NextToken ();
break;
}
} else {
/* This is a label. Use the default type flag to end the loop
** in DeclareLocals. The type code used here doesn't matter as
** long as it has no qualifiers.
*/
UseDefaultType (Spec, TS_DEFAULT_TYPE_INT);
break;
}
/* FALL THROUGH */
default:
UseDefaultType (Spec, TSFlags);
break;
}
/* There may also be specifiers/qualifiers *after* the initial type */
OptionalSpecifiers (Spec, &Qualifiers, TSFlags);
Spec->Type[0].C |= Qualifiers;
}
static const Type* ParamTypeCvt (Type* T)
/* If T is an array or a function, convert it to a pointer else do nothing.
** Return the resulting type.
*/
{
Type* Tmp = 0;
if (IsTypeArray (T)) {
Tmp = ArrayToPtr (T);
} else if (IsTypeFunc (T)) {
Tmp = NewPointerTo (T);
}
if (Tmp != 0) {
/* Do several fixes on qualifiers */
FixQualifiers (Tmp);
/* Replace the type */
TypeCopy (T, Tmp);
TypeFree (Tmp);
}
return T;
}
static void ParseOldStyleParamList (FuncDesc* F)
/* Parse an old-style (K&R) parameter list */
{
unsigned PrevErrorCount = ErrorCount;
/* 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 for parameter name");
/* Try some smart error recovery */
if (SmartErrorSkip (0) < 0) {
break;
}
}
/* 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, TS_DEFAULT_TYPE_NONE, SC_AUTO);
/* Paremeters must have identifiers as names */
Spec.Flags |= DS_NO_EMPTY_DECL;
/* 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");
}
/* Type must be specified */
if ((Spec.Flags & DS_TYPE_MASK) == DS_NONE) {
Error ("Expected declaration specifiers");
break;
}
/* Parse a comma separated variable list */
while (1) {
Declarator Decl;
/* Read the parameter */
ParseDecl (&Spec, &Decl, DM_IDENT_OR_EMPTY);
/* Warn about new local type declaration */
if ((Spec.Flags & DS_NEW_TYPE_DECL) != 0) {
Warning ("'%s' will be invisible out of this function",
GetFullTypeName (Spec.Type));
}
if (Decl.Ident[0] != '\0') {
/* We have a name given. Search for the symbol */
SymEntry* Param = FindLocalSym (Decl.Ident);
if (Param) {
/* Check if we already changed the type for this
** parameter.
*/
if (Param->Flags & SC_DEFTYPE) {
/* Found it, change the default type to the one given */
SymChangeType (Param, ParamTypeCvt (Decl.Type));
/* Reset the "default type" flag */
Param->Flags &= ~SC_DEFTYPE;
} else {
/* Type has already been changed */
Error ("Redefinition for parameter '%s'", Param->Name);
}
} else {
Error ("Unknown identifier: '%s'", Decl.Ident);
}
}
if (CurTok.Tok == TOK_COMMA) {
NextToken ();
} else {
break;
}
}
/* Variable list must be semicolon terminated */
ConsumeSemi ();
}
if (PrevErrorCount != ErrorCount && CurTok.Tok != TOK_LCURLY) {
/* Try some smart error recovery */
SmartErrorSkip (0);
}
}
static void ParseAnsiParamList (FuncDesc* F)
/* Parse a new-style (ANSI) parameter list */
{
/* Parse params */
while (CurTok.Tok != TOK_RPAREN) {
DeclSpec Spec;
Declarator Decl;
SymEntry* Param;
unsigned PrevErrorCount = ErrorCount;
/* Allow an ellipsis as last parameter */
if (CurTok.Tok == TOK_ELLIPSIS) {
NextToken ();
F->Flags |= FD_VARIADIC;
break;
}
/* Read the declaration specifier */
ParseDeclSpec (&Spec, TS_DEFAULT_TYPE_NONE, SC_AUTO);
/* 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;
}
/* Type must be specified */
if ((Spec.Flags & DS_TYPE_MASK) == DS_NONE) {
Error ("Type specifier missing");
}
/* Warn about new local type declaration */
if ((Spec.Flags & DS_NEW_TYPE_DECL) != 0) {
Warning ("'%s' will be invisible out of this function",
GetFullTypeName (Spec.Type));
}
/* Allow parameters without a name, but remember if we had some to
** eventually print an error message later.
*/
ParseDecl (&Spec, &Decl, DM_ACCEPT_PARAM_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 */
Param = AddLocalSym (Decl.Ident, ParamTypeCvt (Decl.Type), Decl.StorageClass, 0);
/* Add attributes if we have any */
SymUseAttr (Param, &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;
if (PrevErrorCount != ErrorCount) {
/* Try some smart error recovery */
if (SmartErrorSkip (0) < 0) {
break;
}
}
/* 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 with the enclosing parentheses */
{
/* Create a new function descriptor */
FuncDesc* F = NewFuncDesc ();
/* Enter a new lexical level */
EnterFunctionLevel ();
/* Skip the opening paren */
NextToken ();
/* Check for several special parameter lists */
if (CurTok.Tok == TOK_RPAREN) {
/* Parameter list is empty (K&R-style) */
F->Flags |= FD_EMPTY;
} 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.
*/
SymEntry* Sym = FindSym (CurTok.Ident);
if (Sym == 0 || !SymIsTypeDef (Sym)) {
/* Old-style (K&R) function. */
F->Flags |= FD_OLDSTYLE;
}
}
/* Parse params */
PushLexicalLevel (LEX_LEVEL_PARAM_LIST);
if ((F->Flags & FD_OLDSTYLE) == 0) {
/* New-style function */
ParseAnsiParamList (F);
} else {
/* Old-style function */
ParseOldStyleParamList (F);
}
PopLexicalLevel ();
/* 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;
/* It is allowed to use incomplete types in function prototypes, so we
** won't always get to know the parameter sizes here and may do that later.
*/
F->Flags |= FD_INCOMPLETE_PARAM;
/* Leave the lexical level remembering the symbol tables */
RememberFunctionLevel (F);
/* Return the function descriptor */
return F;
}
static void DirectDecl (DeclSpec* Spec, Declarator* D, declmode_t Mode)
/* Recursively process direct declarators. Build a type array in reverse order. */
{
/* Read optional function or pointer qualifiers that 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_NONE, T_QUAL_ADDRSIZE | T_QUAL_CCONV);
/* Pointer to something */
if (CurTok.Tok == TOK_STAR) {
/* Skip the star */
NextToken ();
/* A pointer type cannot be used as an empty declaration */
if (Mode == DM_IDENT_OR_EMPTY) {
Spec->Flags |= DS_NO_EMPTY_DECL;
}
/* Allow const, restrict, and volatile qualifiers */
Qualifiers |= OptionalQualifiers (Qualifiers, T_QUAL_CVR);
/* Parse the type that the pointer points to */
DirectDecl (Spec, D, Mode);
/* Add the type */
AddTypeCodeToDeclarator (D, T_PTR | Qualifiers);
return;
}
if (CurTok.Tok == TOK_LPAREN) {
NextToken ();
/* An empty declaration cannot contain parentheses where an identifier
** would show up if it were a non-empty declaration.
*/
if (Mode == DM_IDENT_OR_EMPTY) {
Spec->Flags |= DS_NO_EMPTY_DECL;
}
DirectDecl (Spec, D, Mode);
ConsumeRParen ();
} else if (CurTok.Tok == TOK_IDENT) {
if (Mode == DM_NO_IDENT) {
Error ("Unexpected identifier in type name");
}
strcpy (D->Ident, CurTok.Ident);
NextToken ();
} else {
D->Ident[0] = '\0';
if ((Spec->Flags & DS_NO_EMPTY_DECL) != 0 &&
CurTok.Tok != TOK_LBRACK &&
((Spec->Flags & DS_ALLOW_BITFIELD) == 0 || CurTok.Tok != TOK_COLON)) {
Error ("Identifier expected");
}
}
while (CurTok.Tok == TOK_LBRACK || CurTok.Tok == TOK_LPAREN) {
if (CurTok.Tok == TOK_LPAREN) {
/* Function declarator */
FuncDesc* F;
/* Parse the function declarator */
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;
}
/* 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.F = F;
++D->Index;
/* Qualifiers now used */
Qualifiers = T_QUAL_NONE;
} else {
/* Array declarator */
long Size = UNSPECIFIED;
/* An array type cannot be used as an empty declaration */
if (Mode == DM_IDENT_OR_EMPTY) {
Spec->Flags |= DS_NO_EMPTY_DECL;
if (D->Ident[0] == '\0') {
if ((Spec->Flags & DS_TYPE_MASK) != DS_NONE) {
Error ("Identifier or ';' expected after declaration specifiers");
} else {
Error ("Identifier expected");
}
}
}
/* 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 = NoCodeConstAbsIntExpr (hie1);
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 in parentheses */
{
DeclSpec Spec;
Declarator Decl;
int NeedClean = -1;
/* Skip the left paren */
NextToken ();
/* Get a type without a default */
InitDeclSpec (&Spec);
ParseTypeSpec (&Spec, TS_DEFAULT_TYPE_NONE);
/* Only parse further if there is a type specifier */
if ((Spec.Flags & DS_TYPE_MASK) != DS_NONE) {
/* Parse additional declarators */
NeedClean = ParseDecl (&Spec, &Decl, DM_NO_IDENT);
/* Copy the type to the target buffer */
TypeCopy (T, Decl.Type);
} else {
/* Fail-safe */
TypeCopy (T, type_int);
}
/* Try some smart error recovery */
if (NeedClean < 0) {
SimpleErrorSkip ();
}
/* Closing paren */
if (!ConsumeRParen ()) {
SimpleErrorSkip ();
NextToken ();
}
/* Return a pointer to the target buffer */
return T;
}
int ParseDecl (DeclSpec* Spec, Declarator* D, declmode_t Mode)
/* Parse a variable, type or function declarator. Return -1 if this stops at
** an unpaired right parenthesis/bracket/curly brace. Return 0 if this stops
** after consuming a semicolon or closing curly brace, or reaching an EOF.
** Return 1 otherwise.
*/
{
/* Used to check if we have any errors during parsing this */
unsigned PrevErrorCount = ErrorCount;
/* If there is no explicit type specifier, an optional identifier becomes
** required.
*/
if (Mode == DM_IDENT_OR_EMPTY &&
(Spec->Flags & DS_TYPE_MASK) == DS_DEF_TYPE) {
Spec->Flags |= DS_NO_EMPTY_DECL;
}
/* Initialize the Declarator struct */
InitDeclarator (D);
/* Get additional derivation of the declarator and the identifier */
DirectDecl (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;
/* If we have a function, add a special symbol type */
if (IsTypeFunc (D->Type)) {
D->StorageClass |= SC_FUNC;
}
/* Do several fixes on qualifiers */
FixQualifiers (D->Type);
/* Check if the data type consists of any functions returning forbidden return
** types and remove qualifiers from the return types if they are not void.
*/
FixFunctionReturnType (D->Type);
/* Check recursively if the data type consists of arrays of forbidden types */
CheckArrayElementType (D->Type);
/* Parse attributes for this declarator */
ParseAttribute (D);
/* Check a few pre-C99 things */
if (D->Ident[0] != '\0' && (Spec->Flags & DS_TYPE_MASK) == DS_DEF_TYPE) {
/* Check and warn about an implicit int return in the function */
if (IsTypeFunc (D->Type) && IsRankInt (GetFuncReturnType (D->Type))) {
/* 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 anything that is not a function or typedef, check for an implicit
** int declaration.
*/
if (!IsTypeFunc (D->Type) &&
(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 (IS_Get (&Standard) >= STD_C99) {
Warning ("Implicit 'int' is an obsolete feature");
}
}
}
/* Check the size of the declared type */
if (IsObjectType (D->Type)) {
unsigned Size = SizeOf (D->Type);
if (Size >= 0x10000) {
if (D->Ident[0] != '\0') {
Error ("Size of '%s' is too large (0x%06X)", D->Ident, Size);
} else {
Error ("Size in declaration is too large (0x%06X)", Size);
}
}
}
/* An empty declaration must be terminated with a semicolon */
if (PrevErrorCount == ErrorCount &&
Mode == DM_IDENT_OR_EMPTY &&
D->Ident[0] == '\0' &&
CurTok.Tok != TOK_SEMI &&
((Spec->Flags & DS_ALLOW_BITFIELD) == 0 || CurTok.Tok != TOK_COLON)) {
Error ("Identifier or ';' expected after declaration specifiers");
}
if (PrevErrorCount != ErrorCount) {
if ((Spec->Flags & DS_TYPE_MASK) != DS_DEF_TYPE &&
(Spec->Flags & DS_NO_EMPTY_DECL) != 0 &&
D->Ident[0] == '\0') {
/* Use a fictitious name for the identifier if it is missing */
const char* Level = "";
switch (GetLexicalLevel ()) {
case LEX_LEVEL_GLOBAL:
Level = "global";
break;
case LEX_LEVEL_FUNCTION:
case LEX_LEVEL_BLOCK:
Level = "local";
break;
case LEX_LEVEL_STRUCT:
Level = "field";
break;
default:
Level = "unknown";
break;
}
AnonName (D->Ident, Level);
/* Make the declarator fictitious */
D->StorageClass |= SC_FICTITIOUS;
}
/* Try some smart error recovery */
if (CurTok.Tok != TOK_LCURLY || !IsTypeFunc (D->Type)) {
/* Skip to the end of the whole declaration if it is not part of a
** parameter list or a type cast.
*/
return SmartErrorSkip (Mode == DM_IDENT_OR_EMPTY);
}
}
return 1;
}
void ParseDeclSpec (DeclSpec* Spec, typespec_t TSFlags, unsigned DefStorage)
/* Parse a declaration specification */
{
/* Initialize the DeclSpec struct */
InitDeclSpec (Spec);
/* Assume we're using an explicit storage class */
Spec->Flags &= ~DS_DEF_STORAGE;
/* Parse the type specifiers */
ParseTypeSpec (Spec, TSFlags | TS_STORAGE_CLASS_SPEC | TS_FUNCTION_SPEC);
/* If no explicit storage class is given, use the default */
if (Spec->StorageClass == 0) {
Spec->Flags |= DS_DEF_STORAGE;
Spec->StorageClass = DefStorage;
}
}
void CheckEmptyDecl (const DeclSpec* Spec)
/* 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 ((Spec->Flags & DS_TYPE_MASK) == DS_NONE) {
/* No declaration at all */
} else if ((Spec->Flags & DS_EXTRA_TYPE) == 0) {
Warning ("Declaration does not declare anything");
} else if (IsClassStruct (Spec->Type) &&
!IsIncompleteESUType (Spec->Type) &&
SymHasAnonName (GetESUTagSym (Spec->Type))) {
Warning ("Unnamed %s that defines no instances", GetBasicTypeName (Spec->Type));
}
}
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