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cc65/src/cc65/datatype.c

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/*****************************************************************************/
/* */
/* datatype.c */
/* */
/* Type string handling for the cc65 C compiler */
/* */
/* */
/* */
/* (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 <string.h>
/* common */
#include "addrsize.h"
#include "check.h"
#include "mmodel.h"
#include "xmalloc.h"
/* cc65 */
#include "codegen.h"
#include "datatype.h"
#include "error.h"
#include "fp.h"
#include "funcdesc.h"
#include "global.h"
#include "symtab.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Predefined type strings */
const Type type_char[] = { TYPE(T_CHAR), TYPE(T_END) };
const Type type_schar[] = { TYPE(T_SCHAR), TYPE(T_END) };
const Type type_uchar[] = { TYPE(T_UCHAR), TYPE(T_END) };
const Type type_int[] = { TYPE(T_INT), TYPE(T_END) };
const Type type_uint[] = { TYPE(T_UINT), TYPE(T_END) };
const Type type_long[] = { TYPE(T_LONG), TYPE(T_END) };
const Type type_ulong[] = { TYPE(T_ULONG), TYPE(T_END) };
const Type type_bool[] = { TYPE(T_INT), TYPE(T_END) };
const Type type_void[] = { TYPE(T_VOID), TYPE(T_END) };
const Type type_size_t[] = { TYPE(T_SIZE_T), TYPE(T_END) };
const Type type_float[] = { TYPE(T_FLOAT), TYPE(T_END) };
const Type type_double[] = { TYPE(T_DOUBLE), TYPE(T_END) };
/* More predefined type strings */
const Type type_char_p[] = { TYPE(T_PTR), TYPE(T_CHAR), TYPE(T_END) };
const Type type_c_char_p[] = { TYPE(T_PTR), TYPE(T_C_CHAR), TYPE(T_END) };
const Type type_void_p[] = { TYPE(T_PTR), TYPE(T_VOID), TYPE(T_END) };
const Type type_c_void_p[] = { TYPE(T_PTR), TYPE(T_C_VOID), TYPE(T_END) };
/*****************************************************************************/
/* Code */
/*****************************************************************************/
static struct StrBuf* GetFullTypeNameWestEast (struct StrBuf* West, struct StrBuf* East, const Type* T)
/* Return the name string of the given type split into a western part and an
** eastern part.
*/
{
struct StrBuf Buf = AUTO_STRBUF_INITIALIZER;
if (IsTypeArray (T)) {
long Count = GetElementCount (T);
if (!SB_IsEmpty (East)) {
if (Count > 0) {
SB_Printf (&Buf, "[%ld]", Count);
} else {
SB_Printf (&Buf, "[]");
}
SB_Append (East, &Buf);
SB_Terminate (East);
} else {
if (Count > 0) {
SB_Printf (East, "[%ld]", Count);
} else {
SB_Printf (East, "[]");
}
if (!SB_IsEmpty (West)) {
/* Add parentheses to West */
SB_Printf (&Buf, "(%s)", SB_GetConstBuf (West));
SB_Copy (West, &Buf);
SB_Terminate (West);
}
}
/* Get element type */
GetFullTypeNameWestEast (West, East, T + 1);
} else if (IsTypeFunc (T)) {
FuncDesc* D = GetFuncDesc (T);
struct StrBuf ParamList = AUTO_STRBUF_INITIALIZER;
/* First argument */
SymEntry* Param = D->SymTab->SymHead;
unsigned I;
for (I = 0; I < D->ParamCount; ++I) {
CHECK (Param != 0 && (Param->Flags & SC_PARAM) != 0);
if (I > 0) {
SB_AppendStr (&ParamList, ", ");
}
SB_AppendStr (&ParamList, SB_GetConstBuf (GetFullTypeNameBuf (&Buf, Param->Type)));
SB_Clear (&Buf);
/* Next argument */
Param = Param->NextSym;
}
if ((D->Flags & FD_VARIADIC) == 0) {
if (D->ParamCount == 0 && (D->Flags & FD_EMPTY) == 0) {
SB_AppendStr (&ParamList, "void");
}
} else {
if (D->ParamCount > 0) {
SB_AppendStr (&ParamList, ", ...");
} else {
SB_AppendStr (&ParamList, "...");
}
}
SB_Terminate (&ParamList);
/* Join the existing West and East together */
if (!SB_IsEmpty (East)) {
SB_Append (West, East);
SB_Terminate (West);
SB_Clear (East);
}
if (SB_IsEmpty (West)) {
/* Just use the param list */
SB_Printf (West, "(%s)", SB_GetConstBuf (&ParamList));
} else {
/* Append the param list to the existing West */
SB_Printf (&Buf, "(%s)(%s)", SB_GetConstBuf (West), SB_GetConstBuf (&ParamList));
SB_Printf (West, "%s", SB_GetConstBuf (&Buf));
}
SB_Done (&ParamList);
/* Return type */
GetFullTypeNameWestEast (West, East, T + 1);
} else if (IsTypePtr (T)) {
int QualCount = 0;
SB_Printf (&Buf, "*");
/* Add qualifiers */
if ((GetQualifier (T) & ~T_QUAL_NEAR) != T_QUAL_NONE) {
QualCount = GetQualifierTypeCodeNameBuf (&Buf, T->C, T_QUAL_NEAR);
}
if (!SB_IsEmpty (West)) {
if (QualCount > 0) {
SB_AppendChar (&Buf, ' ');
}
SB_Append (&Buf, West);
}
SB_Copy (West, &Buf);
SB_Terminate (West);
/* Get indirection type */
GetFullTypeNameWestEast (West, East, T + 1);
} else {
/* Add qualifiers */
if ((GetQualifier (T) & ~T_QUAL_NEAR) != 0) {
if (GetQualifierTypeCodeNameBuf (&Buf, T->C, T_QUAL_NEAR) > 0) {
SB_AppendChar (&Buf, ' ');
}
}
if (!IsTypeBitField (T)) {
SB_AppendStr (&Buf, GetSymTypeName (T));
} else {
SB_AppendStr (&Buf, GetBasicTypeName (T + 1));
}
if (!SB_IsEmpty (West)) {
SB_AppendChar (&Buf, ' ');
SB_Append (&Buf, West);
}
SB_Copy (West, &Buf);
SB_Terminate (West);
}
SB_Done (&Buf);
return West;
}
const char* GetBasicTypeName (const Type* T)
/* Return a const name string of the basic type.
** Return "type" for unknown basic types.
*/
{
switch (GetRawType (T)) {
case T_TYPE_ENUM: return "enum";
case T_TYPE_BITFIELD: return "bit-field";
case T_TYPE_FLOAT: return "float";
case T_TYPE_DOUBLE: return "double";
case T_TYPE_VOID: return "void";
case T_TYPE_STRUCT: return "struct";
case T_TYPE_UNION: return "union";
case T_TYPE_ARRAY: return "array";
case T_TYPE_PTR: return "pointer";
case T_TYPE_FUNC: return "function";
case T_TYPE_NONE: /* FALLTHROUGH */
default: break;
}
if (IsClassInt (T)) {
if (IsRawSignSigned (T)) {
switch (GetRawType (T)) {
case T_TYPE_CHAR: return "signed char";
case T_TYPE_SHORT: return "short";
case T_TYPE_INT: return "int";
case T_TYPE_LONG: return "long";
case T_TYPE_LONGLONG: return "long long";
default:
return "signed integer";
}
} else if (IsRawSignUnsigned (T)) {
switch (GetRawType (T)) {
case T_TYPE_CHAR: return "unsigned char";
case T_TYPE_SHORT: return "unsigned short";
case T_TYPE_INT: return "unsigned int";
case T_TYPE_LONG: return "unsigned long";
case T_TYPE_LONGLONG: return "unsigned long long";
default:
return "unsigned integer";
}
} else {
switch (GetRawType (T)) {
case T_TYPE_CHAR: return "char";
case T_TYPE_SHORT: return "short";
case T_TYPE_INT: return "int";
case T_TYPE_LONG: return "long";
case T_TYPE_LONGLONG: return "long long";
default:
return "integer";
}
}
}
return "type";
}
const char* GetFullTypeName (const Type* T)
/* Return the full name string of the given type */
{
struct StrBuf* Buf = NewDiagnosticStrBuf ();
GetFullTypeNameBuf (Buf, T);
return SB_GetConstBuf (Buf);
}
struct StrBuf* GetFullTypeNameBuf (struct StrBuf* S, const Type* T)
/* Return the full name string of the given type */
{
struct StrBuf East = AUTO_STRBUF_INITIALIZER;
GetFullTypeNameWestEast (S, &East, T);
/* Join West and East */
SB_Append (S, &East);
SB_Terminate (S);
SB_Done (&East);
return S;
}
int GetQualifierTypeCodeNameBuf (struct StrBuf* S, TypeCode Qual, TypeCode IgnoredQual)
/* Return the names of the qualifiers of the type.
** Qualifiers to be ignored can be specified with the IgnoredQual flags.
** Return the count of added qualifier names.
*/
{
int Count = 0;
Qual &= T_MASK_QUAL & ~IgnoredQual;
if (Qual & T_QUAL_CONST) {
if (!SB_IsEmpty (S)) {
SB_AppendChar (S, ' ');
}
SB_AppendStr (S, "const");
++Count;
}
if (Qual & T_QUAL_VOLATILE) {
if (Count > 0) {
SB_AppendChar (S, ' ');
}
SB_AppendStr (S, "volatile");
++Count;
}
if (Qual & T_QUAL_RESTRICT) {
if (Count > 0) {
SB_AppendChar (S, ' ');
}
SB_AppendStr (S, "restrict");
++Count;
}
if (Qual & T_QUAL_NEAR) {
if (Count > 0) {
SB_AppendChar (S, ' ');
}
SB_AppendStr (S, "__near__");
++Count;
}
if (Qual & T_QUAL_FAR) {
SB_AppendStr (S, "__far__");
++Count;
}
if (Qual & T_QUAL_FASTCALL) {
if (Count > 0) {
SB_AppendChar (S, ' ');
}
SB_AppendStr (S, "__fastcall__");
++Count;
}
if (Qual & T_QUAL_CDECL) {
if (Count > 0) {
SB_AppendChar (S, ' ');
}
SB_AppendStr (S, "__cdecl__");
++Count;
}
if (Count > 0) {
SB_Terminate (S);
}
return Count;
}
unsigned TypeLen (const Type* T)
/* Return the length of the type string */
{
const Type* Start = T;
while (T->C != T_END) {
++T;
}
return T - Start;
}
Type* TypeCopy (Type* Dest, const Type* Src)
/* Copy a type string */
{
Type* Orig = Dest;
while (1) {
*Dest = *Src;
if (Src->C == T_END) {
break;
}
Src++;
Dest++;
}
return Orig;
}
Type* TypeDup (const Type* T)
/* Create a copy of the given type on the heap */
{
unsigned Len = (TypeLen (T) + 1) * sizeof (Type);
return memcpy (xmalloc (Len), T, Len);
}
Type* TypeAlloc (unsigned Len)
/* Allocate memory for a type string of length Len. Len *must* include the
** trailing T_END.
*/
{
return xmalloc (Len * sizeof (Type));
}
void TypeFree (Type* T)
/* Free a type string */
{
xfree (T);
}
int SignExtendChar (int C)
/* Do correct sign extension of a character */
{
if (IS_Get (&SignedChars) && (C & 0x80) != 0) {
return C | ~0xFF;
} else {
return C & 0xFF;
}
}
Type* GetCharArrayType (unsigned Len)
/* Return the type for a char array of the given length */
{
/* Allocate memory for the type string */
Type* T = TypeAlloc (3); /* array/char/terminator */
/* Fill the type string */
T[0].C = T_ARRAY;
T[0].A.L = Len; /* Array length is in the L attribute */
T[1].C = T_CHAR;
T[2].C = T_END;
/* Return the new type */
return T;
}
Type* GetImplicitFuncType (void)
/* Return a type string for an inplicitly declared function */
{
/* Get a new function descriptor */
FuncDesc* F = NewFuncDesc ();
/* Allocate memory for the type string */
Type* T = TypeAlloc (3); /* func/returns int/terminator */
/* Prepare the function descriptor */
F->Flags = FD_EMPTY;
F->SymTab = &EmptySymTab;
F->TagTab = &EmptySymTab;
/* Fill the type string */
T[0].C = T_FUNC | CodeAddrSizeQualifier ();
T[0].A.F = F;
T[1].C = T_INT;
T[2].C = T_END;
/* Return the new type */
return T;
}
const Type* GetStructReplacementType (const Type* SType)
/* Get a replacement type for passing a struct/union in the primary register */
{
const Type* NewType;
/* If the size is less than or equal to that of a long, we will copy the
** struct using the primary register, otherwise we will use memcpy.
*/
switch (SizeOf (SType)) {
case 1: NewType = type_uchar; break;
case 2: NewType = type_uint; break;
case 3: /* FALLTHROUGH */
case 4: NewType = type_ulong; break;
default: NewType = SType; break;
}
return NewType;
}
long GetIntegerTypeMin (const Type* Type)
/* Get the smallest possible value of the integer type.
** The type must have a known size.
*/
{
if (SizeOf (Type) == 0) {
Internal ("Incomplete type used in GetIntegerTypeMin");
}
if (IsSignSigned (Type)) {
/* The smallest possible signed value of N-byte integer is -pow(2, 8*N-1) */
return (long)((unsigned long)(-1L) << (CHAR_BITS * SizeOf (Type) - 1U));
} else {
return 0;
}
}
unsigned long GetIntegerTypeMax (const Type* Type)
/* Get the largest possible value of the integer type.
** The type must have a known size.
*/
{
if (SizeOf (Type) == 0) {
Internal ("Incomplete type used in GetIntegerTypeMax");
}
if (IsSignSigned (Type)) {
/* Min signed value of N-byte integer is pow(2, 8*N-1) - 1 */
return (1UL << (CHAR_BITS * SizeOf (Type) - 1U)) - 1UL;
} else {
/* Max signed value of N-byte integer is pow(2, 8*N) - 1. However,
** workaround is needed as in ISO C it is UB if the shift count is
** equal to the bit width of the left operand type.
*/
return (1UL << 1U << (CHAR_BITS * SizeOf (Type) - 1U)) - 1UL;
}
}
static unsigned GetBitFieldMinimalTypeSize (unsigned BitWidth)
/* Return the size of the smallest integer type that may have BitWidth bits */
{
/* Since all integer types supported in cc65 for bit-fields have sizes that
** are powers of 2, we can just use this bit-twiddling trick.
*/
unsigned V = (int)(BitWidth - 1U) / (int)CHAR_BITS;
V |= V >> 1;
V |= V >> 2;
V |= V >> 4;
V |= V >> 8;
V |= V >> 16;
/* Return the result size */
return V + 1U;
}
static unsigned TypeOfBySize (unsigned Size)
/* Get the code generator replacement type of the object by its size */
{
unsigned NewType;
/* If the size is less than or equal to that of a a long, we will copy
** the struct using the primary register, otherwise we use memcpy.
*/
switch (Size) {
case 1: NewType = CF_CHAR; break;
case 2: NewType = CF_INT; break;
case 3: /* FALLTHROUGH */
case 4: NewType = CF_LONG; break;
default: NewType = CF_NONE; break;
}
return NewType;
}
const Type* GetUnderlyingType (const Type* Type)
/* Get the underlying type of an enum or other integer class type */
{
if (IsISOChar (Type)) {
return IS_Get (&SignedChars) ? type_schar : type_uchar;
} else if (IsTypeEnum (Type)) {
/* This should not happen, but just in case */
if (Type->A.S == 0) {
Internal ("Enum tag type error in GetUnderlyingTypeCode");
}
/* If incomplete enum type is used, just return its raw type */
if (Type->A.S->V.E.Type != 0) {
return Type->A.S->V.E.Type;
}
} else if (IsTypeBitField (Type)) {
/* We consider the smallest type that can represent all values of the
** bit-field, instead of the type used in the declaration, the truly
** underlying of the bit-field.
*/
switch (GetBitFieldMinimalTypeSize (Type->A.B.Width)) {
case SIZEOF_CHAR: Type = IsSignSigned (Type) ? type_schar : type_uchar; break;
case SIZEOF_INT: Type = IsSignSigned (Type) ? type_int : type_uint; break;
case SIZEOF_LONG: Type = IsSignSigned (Type) ? type_long : type_ulong; break;
default: Type = IsSignSigned (Type) ? type_int : type_uint; break;
}
}
return Type;
}
TypeCode GetUnderlyingTypeCode (const Type* Type)
/* Get the type code of the unqualified underlying type of TCode.
** Return UnqualifiedType (TCode) if TCode is not scalar.
*/
{
TypeCode Underlying = UnqualifiedType (Type->C);
if (IsISOChar (Type)) {
return IS_Get (&SignedChars) ? T_SCHAR : T_UCHAR;
} else if (IsTypeEnum (Type)) {
TypeCode TCode;
/* This should not happen, but just in case */
if (Type->A.S == 0) {
Internal ("Enum tag type error in GetUnderlyingTypeCode");
}
/* Inspect the underlying type of the enum */
if (Type->A.S->V.E.Type == 0) {
/* Incomplete enum type is used */
return Underlying;
}
TCode = UnqualifiedType (Type->A.S->V.E.Type->C);
/* Replace the type code with integer */
Underlying = (TCode & ~T_MASK_TYPE);
switch (TCode & T_MASK_SIZE) {
case T_SIZE_INT: Underlying |= T_TYPE_INT; break;
case T_SIZE_LONG: Underlying |= T_TYPE_LONG; break;
case T_SIZE_SHORT: Underlying |= T_TYPE_SHORT; break;
case T_SIZE_CHAR: Underlying |= T_TYPE_CHAR; break;
case T_SIZE_LONGLONG: Underlying |= T_TYPE_LONGLONG; break;
default: Underlying |= T_TYPE_INT; break;
}
} else if (IsTypeBitField (Type)) {
/* We consider the smallest type that can represent all values of the
** bit-field, instead of the type used in the declaration, the truly
** underlying of the bit-field.
*/
switch (GetBitFieldMinimalTypeSize (Type->A.B.Width)) {
case SIZEOF_CHAR: Underlying = T_CHAR; break;
case SIZEOF_INT: Underlying = T_INT; break;
case SIZEOF_LONG: Underlying = T_LONG; break;
case SIZEOF_LONGLONG: Underlying = T_LONGLONG; break;
default: Underlying = T_INT; break;
}
Underlying &= ~T_MASK_SIGN;
Underlying |= Type->C & T_MASK_SIGN;
}
return Underlying;
}
const Type* GetBitFieldChunkType (const Type* Type)
/* Get the type needed to operate on the byte chunk containing the bit-field */
{
unsigned ChunkSize;
if ((Type->A.B.Width - 1U) / CHAR_BITS ==
(Type->A.B.Offs + Type->A.B.Width - 1U) / CHAR_BITS) {
/* T bit-field fits within its underlying type */
return GetUnderlyingType (Type);
}
ChunkSize = GetBitFieldMinimalTypeSize (Type->A.B.Offs + Type->A.B.Width);
if (ChunkSize < SizeOf (Type + 1)) {
/* The end of the bit-field is offset by some bits so that it requires
** more bytes to be accessed as a whole than its underlying type does.
** Note: In cc65 the bit offset is always less than CHAR_BITS.
*/
switch (ChunkSize) {
case SIZEOF_CHAR: return IsSignSigned (Type) ? type_schar : type_uchar;
case SIZEOF_INT: return IsSignSigned (Type) ? type_int : type_uint;
case SIZEOF_LONG: return IsSignSigned (Type) ? type_long : type_ulong;
default: return IsSignSigned (Type) ? type_int : type_uint;
}
}
/* We can always use the declarartion integer type as the chunk type.
** Note: A bit-field will not occupy bits located in bytes more than that
** of its declaration type in cc65. So this is OK.
*/
return Type + 1;
}
unsigned SizeOf (const Type* T)
/* Compute size of object represented by type array. */
{
switch (GetUnderlyingTypeCode (T)) {
case T_VOID:
/* A void variable is a cc65 extension.
** Get its size (in bytes).
*/
return T->A.U;
/* Beware: There's a chance that this triggers problems in other parts
** of the compiler. The solution is to fix the callers, because calling
** SizeOf() with a function type as argument is bad.
*/
case T_FUNC:
return 0; /* Size of function is unknown */
case T_SCHAR:
case T_UCHAR:
return SIZEOF_CHAR;
case T_SHORT:
case T_USHORT:
return SIZEOF_SHORT;
case T_INT:
case T_UINT:
return SIZEOF_INT;
case T_PTR:
return SIZEOF_PTR;
case T_LONG:
case T_ULONG:
return SIZEOF_LONG;
case T_LONGLONG:
case T_ULONGLONG:
return SIZEOF_LONGLONG;
case T_FLOAT:
return SIZEOF_FLOAT;
case T_DOUBLE:
return SIZEOF_DOUBLE;
case T_STRUCT:
case T_UNION:
return T->A.S->V.S.Size;
case T_ARRAY:
if (T->A.L == UNSPECIFIED) {
/* Array with unspecified size */
return 0;
} else {
return T->A.U * SizeOf (T + 1);
}
case T_ENUM:
/* Incomplete enum type */
return 0;
default:
Internal ("Unknown type in SizeOf: %04lX", T->C);
return 0;
}
}
unsigned PSizeOf (const Type* T)
/* Compute size of pointer object. */
{
/* We are expecting a pointer expression */
CHECK (IsClassPtr (T));
/* Skip the pointer or array token itself */
return SizeOf (T + 1);
}
unsigned CheckedSizeOf (const Type* T)
/* Return the size of a data type. If the size is zero, emit an error and
** return some valid size instead (so the rest of the compiler doesn't have
** to work with invalid sizes).
*/
{
unsigned Size = SizeOf (T);
if (Size == 0) {
if (HasUnknownSize (T + 1)) {
Error ("Size of type '%s' is unknown", GetFullTypeName (T));
} else {
Error ("Size of type '%s' is 0", GetFullTypeName (T));
}
Size = SIZEOF_CHAR; /* Don't return zero */
}
return Size;
}
unsigned CheckedPSizeOf (const Type* T)
/* Return the size of a data type that is pointed to by a pointer. If the
** size is zero, emit an error and return some valid size instead (so the
** rest of the compiler doesn't have to work with invalid sizes).
*/
{
unsigned Size = PSizeOf (T);
if (Size == 0) {
if (HasUnknownSize (T + 1)) {
Error ("Pointer to type '%s' of unknown size", GetFullTypeName (T + 1));
} else {
Error ("Pointer to type '%s' of 0 size", GetFullTypeName (T + 1));
}
Size = SIZEOF_CHAR; /* Don't return zero */
}
return Size;
}
unsigned TypeOf (const Type* T)
/* Get the code generator base type of the object */
{
unsigned NewType;
switch (GetUnderlyingTypeCode (T)) {
case T_SCHAR:
return CF_CHAR;
case T_UCHAR:
return CF_CHAR | CF_UNSIGNED;
case T_SHORT:
case T_INT:
return CF_INT;
case T_USHORT:
case T_UINT:
case T_PTR:
case T_ARRAY:
return CF_INT | CF_UNSIGNED;
case T_LONG:
return CF_LONG;
case T_ULONG:
return CF_LONG | CF_UNSIGNED;
case T_FLOAT:
case T_DOUBLE:
/* These two are identical in the backend */
return CF_FLOAT;
case T_FUNC:
/* Treat this as a function pointer */
return CF_INT | CF_UNSIGNED;
case T_STRUCT:
case T_UNION:
NewType = TypeOfBySize (SizeOf (T));
if (NewType != CF_NONE) {
return NewType;
}
/* Address of ... */
return CF_INT | CF_UNSIGNED;
case T_VOID:
case T_ENUM:
/* Incomplete enum type */
Error ("Incomplete type '%s'", GetFullTypeName (T));
return CF_INT;
default:
Error ("Illegal type %04lX", T->C);
return CF_INT;
}
}
unsigned FuncTypeOf (const Type* T)
/* Get the code generator flag for calling the function */
{
if (GetUnderlyingTypeCode (T) == T_FUNC) {
return (T->A.F->Flags & FD_VARIADIC) ? 0 : CF_FIXARGC;
} else {
Error ("Illegal function type %04lX", T->C);
return 0;
}
}
const Type* Indirect (const Type* T)
/* Do one indirection for the given type, that is, return the type where the
** given type points to.
*/
{
/* We are expecting a pointer expression */
CHECK (IsClassPtr (T));
/* Skip the pointer or array token itself */
return T + 1;
}
Type* IndirectModifiable (Type* T)
/* Do one indirection for the given type, that is, return the type where the
** given type points to.
*/
{
/* We are expecting a pointer expression */
CHECK (IsClassPtr (T));
/* Skip the pointer or array token itself */
return T + 1;
}
Type* NewPointerTo (const Type* T)
/* Return a type string that is "pointer to T". The type string is allocated
** on the heap and may be freed after use.
*/
{
/* Get the size of the type string including the terminator */
unsigned Size = TypeLen (T) + 1;
/* Allocate the new type string */
Type* P = TypeAlloc (Size + 1);
/* Create the return type... */
P[0].C = T_PTR | (T[0].C & T_QUAL_ADDRSIZE);
memcpy (P+1, T, Size * sizeof (Type));
/* ...and return it */
return P;
}
const Type* AddressOf (const Type* T)
/* Return a type string that is "address of T". The type string is allocated
** on the heap and may be freed after use.
*/
{
/* Get the size of the type string including the terminator */
unsigned Size = TypeLen (T) + 1;
/* Allocate the new type string */
Type* P = TypeAlloc (Size + 1);
/* Create the return type... */
P[0].C = T_PTR | (T[0].C & T_QUAL_ADDRSIZE) | T_QUAL_CONST;
memcpy (P+1, T, Size * sizeof (Type));
/* ...and return it */
return P;
}
Type* ArrayToPtr (const Type* T)
/* Convert an array to a pointer to it's first element */
{
/* Return pointer to first element */
return NewPointerTo (GetElementType (T));
}
const Type* PtrConversion (const Type* T)
/* If the type is a function, convert it to pointer to function. If the
** expression is an array, convert it to pointer to first element. Otherwise
** return T.
*/
{
if (IsTypeFunc (T)) {
return AddressOf (T);
} else if (IsTypeArray (T)) {
return AddressOf (GetElementType (T));
} else {
return T;
}
}
const Type* StdConversion (const Type* T)
/* If the type is a function, convert it to pointer to function. If the
** expression is an array, convert it to pointer to first element. If the
** type is an integer, do integeral promotion. Otherwise return T.
*/
{
if (IsTypeFunc (T)) {
return AddressOf (T);
} else if (IsTypeArray (T)) {
return AddressOf (GetElementType (T));
} else if (IsClassInt (T)) {
return IntPromotion (T);
} else {
return T;
}
}
const Type* IntPromotion (const Type* T)
/* Apply the integer promotions to T and return the result. The returned type
** string may be T if there is no need to change it.
*/
{
/* We must have an int to apply int promotions */
PRECONDITION (IsClassInt (T));
/* https://port70.net/~nsz/c/c89/c89-draft.html#3.2.1.1
** A char, a short int, or an int bit-field, or their signed or unsigned varieties, or
** an object that has enumeration type, may be used in an expression wherever an int or
** unsigned int may be used. If an int can represent all values of the original type,
** the value is converted to an int; otherwise it is converted to an unsigned int.
** These are called the integral promotions.
*/
if (IsTypeBitField (T)) {
/* As we now support long bit-fields, we need modified rules for them:
** - If an int can represent all values of the bit-field, the bit-field is converted
** to an int;
** - Otherwise, if an unsigned int can represent all values of the bit-field, the
** bit-field is converted to an unsigned int;
** - Otherwise, the bit-field will have its declared integer type.
** These rules are borrowed from C++ and seem to be consistent with GCC/Clang's.
*/
if (T->A.B.Width > INT_BITS) {
return IsSignUnsigned (T) ? type_ulong : type_long;
}
return T->A.B.Width == INT_BITS && IsSignUnsigned (T) ? type_uint : type_int;
} else if (IsTypeChar (T)) {
/* An integer can represent all values from either signed or unsigned char, so convert
** chars to int.
*/
return type_int;
} else if (IsTypeShort (T)) {
/* An integer cannot represent all values from unsigned short, so convert unsigned short
** to unsigned int.
*/
return IsSignUnsigned (T) ? type_uint : type_int;
} else if (!IsIncompleteESUType (T)) {
/* The type is a complete type not smaller than int, so leave it alone. */
return T;
} else {
/* Otherwise, this is an incomplete enum, and there is expceted to be an error already.
** Assume int to avoid further errors.
*/
return type_int;
}
}
const Type* ArithmeticConvert (const Type* lhst, const Type* rhst)
/* Perform the usual arithmetic conversions for binary operators. */
{
/* https://port70.net/~nsz/c/c89/c89-draft.html#3.2.1.5
** Many binary operators that expect operands of arithmetic type cause conversions and yield
** result types in a similar way. The purpose is to yield a common type, which is also the type
** of the result. This pattern is called the usual arithmetic conversions.
*/
/* There are additional rules for floating point types that we don't bother with, since
** floating point types are not (yet) supported.
** The integral promotions are performed on both operands.
*/
lhst = IntPromotion (lhst);
rhst = IntPromotion (rhst);
/* If either operand has type unsigned long int, the other operand is converted to
** unsigned long int.
*/
if ((IsTypeLong (lhst) && IsSignUnsigned (lhst)) ||
(IsTypeLong (rhst) && IsSignUnsigned (rhst))) {
return type_ulong;
}
/* Otherwise, if one operand has type long int and the other has type unsigned int,
** if a long int can represent all values of an unsigned int, the operand of type unsigned int
** is converted to long int ; if a long int cannot represent all the values of an unsigned int,
** both operands are converted to unsigned long int.
*/
if ((IsTypeLong (lhst) && IsTypeInt (rhst) && IsSignUnsigned (rhst)) ||
(IsTypeLong (rhst) && IsTypeInt (lhst) && IsSignUnsigned (lhst))) {
/* long can represent all unsigneds, so we are in the first sub-case. */
return type_long;
}
/* Otherwise, if either operand has type long int, the other operand is converted to long int.
*/
if (IsTypeLong (lhst) || IsTypeLong (rhst)) {
return type_long;
}
/* Otherwise, if either operand has type unsigned int, the other operand is converted to
** unsigned int.
*/
if ((IsTypeInt (lhst) && IsSignUnsigned (lhst)) ||
(IsTypeInt (rhst) && IsSignUnsigned (rhst))) {
return type_uint;
}
/* Otherwise, both operands have type int. */
CHECK (IsTypeInt (lhst));
CHECK (IsSignSigned (lhst));
CHECK (IsTypeInt (rhst));
CHECK (IsSignSigned (rhst));
return type_int;
}
const Type* SignedType (const Type* T)
/* Get signed counterpart of the integral type */
{
switch (GetUnderlyingTypeCode (T) & T_MASK_TYPE) {
case T_TYPE_CHAR:
return type_schar;
case T_TYPE_INT:
case T_TYPE_SHORT:
return type_int;
case T_TYPE_LONG:
return type_long;
default:
Internal ("Unknown type code: %lX", GetUnderlyingTypeCode (T));
return T;
}
}
const Type* UnsignedType (const Type* T)
/* Get unsigned counterpart of the integral type */
{
switch (GetUnderlyingTypeCode (T) & T_MASK_TYPE) {
case T_TYPE_CHAR:
return type_uchar;
case T_TYPE_INT:
case T_TYPE_SHORT:
return type_uint;
case T_TYPE_LONG:
return type_ulong;
default:
Internal ("Unknown type code: %lX", GetUnderlyingTypeCode (T));
return T;
}
}
Type* NewBitFieldType (const Type* T, unsigned BitOffs, unsigned BitWidth)
/* Return a type string that is "T : BitWidth" aligned on BitOffs. The type
** string is allocated on the heap and may be freed after use.
*/
{
Type* P;
/* The type specifier must be integeral */
CHECK (IsClassInt (T));
/* Allocate the new type string */
P = TypeAlloc (3);
/* Create the return type... */
P[0].C = IsSignSigned (T) ? T_SBITFIELD : T_UBITFIELD;
P[0].C |= (T[0].C & T_QUAL_ADDRSIZE);
P[0].A.B.Offs = BitOffs;
P[0].A.B.Width = BitWidth;
/* Get the declaration type */
memcpy (&P[1], GetUnderlyingType (T), sizeof (P[1]));
/* Get done... */
P[2].C = T_END;
/* ...and return it */
return P;
}
int IsTypeFragBitField (const Type* T)
/* Return true if this is a bit-field that shares byte space with other fields */
{
return IsTypeBitField (T) &&
(T->A.B.Offs != 0 || T->A.B.Width != CHAR_BITS * SizeOf (T));
}
int IsClassObject (const Type* T)
/* Return true if this is a fully described object type */
{
return !IsTypeFunc (T) && !IsClassIncomplete (T);
}
int IsClassIncomplete (const Type* T)
/* Return true if this is an object type lacking size info */
{
if (IsTypeArray (T)) {
return GetElementCount (T) == UNSPECIFIED || IsClassIncomplete (T + 1);
}
return IsTypeVoid (T) || IsIncompleteESUType (T);
}
int IsClassArithmetic (const Type* T)
/* Return true if this is an integer or real floating type */
{
return IsClassInt (T) || IsClassFloat (T);
}
int IsClassBasic (const Type* T)
/* Return true if this is a char, integer or floating type */
{
return IsClassChar (T) || IsClassInt (T) || IsClassFloat (T);
}
int IsClassScalar (const Type* T)
/* Return true if this is an arithmetic or pointer type */
{
return IsClassArithmetic (T) || IsTypePtr (T);
}
int IsClassDerived (const Type* T)
/* Return true if this is an array, struct, union, function or pointer type */
{
return IsTypeArray (T) || IsClassStruct (T) || IsClassFunc (T) || IsTypePtr (T);
}
int IsClassAggregate (const Type* T)
/* Return true if this is an array or struct type */
{
return IsTypeArray (T) || IsTypeStruct (T);
}
int IsRelationType (const Type* T)
/* Return true if this is an arithmetic, array or pointer type */
{
return IsClassArithmetic (T) || IsClassPtr (T);
}
int IsCastType (const Type* T)
/* Return true if this type can be used for casting */
{
return IsClassScalar (T) || IsTypeVoid (T);
}
int IsESUType (const Type* T)
/* Return true if this is an enum/struct/union type */
{
return IsClassStruct (T) || IsTypeEnum (T);
}
int IsIncompleteESUType (const Type* T)
/* Return true if this is an incomplete ESU type */
{
SymEntry* Sym = GetSymType (T);
return Sym != 0 && !SymIsDef (Sym);
}
int IsEmptiableObjectType (const Type* T)
/* Return true if this is a struct/union/void type that can have zero size */
{
return IsClassStruct (T) || IsTypeVoid (T);
}
int HasUnknownSize (const Type* T)
/* Return true if this is an incomplete ESU type or an array of unknown size */
{
if (IsTypeArray (T)) {
return GetElementCount (T) == UNSPECIFIED || HasUnknownSize (T + 1);
}
return IsIncompleteESUType (T);
}
int IsVariadicFunc (const Type* T)
/* Return true if this is a function type or pointer to function type with
** variable parameter list.
** Check fails if the type is not a function or a pointer to function.
*/
{
return (GetFuncDesc (T)->Flags & FD_VARIADIC) != 0;
}
int IsFastcallFunc (const Type* T)
/* Return true if this is a function type or pointer to function type by
** __fastcall__ calling convention.
** Check fails if the type is not a function or a pointer to function.
*/
{
if (UnqualifiedType (T->C) == T_PTR) {
/* Pointer to function */
++T;
}
return !IsVariadicFunc (T) && (AutoCDecl ? IsQualFastcall (T) : !IsQualCDecl (T));
}
FuncDesc* GetFuncDesc (const Type* T)
/* Get the FuncDesc pointer from a function or pointer-to-function type */
{
if (UnqualifiedType (T->C) == T_PTR) {
/* Pointer to function */
++T;
}
/* Be sure it's a function type */
CHECK (IsClassFunc (T));
/* Get the function descriptor from the type attributes */
return T->A.F;
}
void SetFuncDesc (Type* T, FuncDesc* F)
/* Set the FuncDesc pointer in a function or pointer-to-function type */
{
if (UnqualifiedType (T->C) == T_PTR) {
/* Pointer to function */
++T;
}
/* Be sure it's a function type */
CHECK (IsClassFunc (T));
/* Set the function descriptor */
T->A.F = F;
}
const Type* GetFuncReturn (const Type* T)
/* Return a pointer to the return type of a function or pointer-to-function type */
{
if (UnqualifiedType (T->C) == T_PTR) {
/* Pointer to function */
++T;
}
/* Be sure it's a function type */
CHECK (IsClassFunc (T));
/* Return a pointer to the return type */
return T + 1;
}
Type* GetFuncReturnModifiable (Type* T)
/* Return a non-const pointer to the return type of a function or pointer-to-function type */
{
if (UnqualifiedType (T->C) == T_PTR) {
/* Pointer to function */
++T;
}
/* Be sure it's a function type */
CHECK (IsClassFunc (T));
/* Return a pointer to the return type */
return T + 1;
}
const FuncDesc* GetFuncDefinitionDesc (const Type* T)
/* Get the function descriptor of the function definition */
{
const FuncDesc* D;
/* Be sure it's a function type */
CHECK (IsClassFunc (T));
D = GetFuncDesc (T);
return D->FuncDef != 0 ? D->FuncDef : D;
}
long GetElementCount (const Type* T)
/* Get the element count of the array specified in T (which must be of
** array type).
*/
{
CHECK (IsTypeArray (T));
return T->A.L;
}
void SetElementCount (Type* T, long Count)
/* Set the element count of the array specified in T (which must be of
** array type).
*/
{
CHECK (IsTypeArray (T));
T->A.L = Count;
}
const Type* GetElementType (const Type* T)
/* Return the element type of the given array type. */
{
CHECK (IsTypeArray (T));
return T + 1;
}
const Type* GetBaseElementType (const Type* T)
/* Return the base element type of a given type. If T is not an array, this
** will return. Otherwise it will return the base element type, which means
** the element type that is not an array.
*/
{
while (IsTypeArray (T)) {
++T;
}
return T;
}
struct SymEntry* GetESUSymEntry (const Type* T)
/* Return a SymEntry pointer from an enum/struct/union type */
{
/* Only enums, structs or unions have a SymEntry attribute */
CHECK (IsClassStruct (T) || IsTypeEnum (T));
/* Return the attribute */
return T->A.S;
}
void SetESUSymEntry (Type* T, struct SymEntry* S)
/* Set the SymEntry pointer for an enum/struct/union type */
{
/* Only enums, structs or unions have a SymEntry attribute */
CHECK (IsClassStruct (T) || IsTypeEnum (T));
/* Set the attribute */
T->A.S = S;
}
TypeCode AddrSizeQualifier (unsigned AddrSize)
/* Return T_QUAL_NEAR or T_QUAL_FAR depending on the address size */
{
switch (AddrSize) {
case ADDR_SIZE_ABS:
return T_QUAL_NEAR;
case ADDR_SIZE_FAR:
return T_QUAL_FAR;
default:
Error ("Invalid address size");
return T_QUAL_NEAR;
}
}
int TypeHasAttr (const Type* T)
/* Return true if the given type has attribute data */
{
return IsClassStruct (T) || IsTypeArray (T) || IsClassFunc (T);
}
void PrintType (FILE* F, const Type* T)
/* Print fulle name of the type */
{
StrBuf Buf = AUTO_STRBUF_INITIALIZER;
fprintf (F, "%s", SB_GetConstBuf (GetFullTypeNameBuf (&Buf, T)));
SB_Done (&Buf);
}
void PrintFuncSig (FILE* F, const char* Name, const Type* T)
/* Print a function signature */
{
StrBuf Buf = AUTO_STRBUF_INITIALIZER;
StrBuf ParamList = AUTO_STRBUF_INITIALIZER;
StrBuf East = AUTO_STRBUF_INITIALIZER;
StrBuf West = AUTO_STRBUF_INITIALIZER;
/* Get the function descriptor used in definition */
const FuncDesc* D = GetFuncDefinitionDesc (T);
/* Get the parameter list string. Start from the first parameter */
SymEntry* Param = D->SymTab->SymHead;
unsigned I;
for (I = 0; I < D->ParamCount; ++I) {
CHECK (Param != 0 && (Param->Flags & SC_PARAM) != 0);
if (I > 0) {
SB_AppendStr (&ParamList, ", ");
}
if (SymIsRegVar (Param)) {
SB_AppendStr (&ParamList, "register ");
}
if (!HasAnonName (Param)) {
SB_AppendStr (&Buf, Param->Name);
}
SB_AppendStr (&ParamList, SB_GetConstBuf (GetFullTypeNameBuf (&Buf, Param->Type)));
SB_Clear (&Buf);
/* Next argument */
Param = Param->NextSym;
}
if ((D->Flags & FD_VARIADIC) == 0) {
if (D->ParamCount == 0 && (D->Flags & FD_EMPTY) == 0) {
SB_AppendStr (&ParamList, "void");
}
} else {
if (D->ParamCount > 0) {
SB_AppendStr (&ParamList, ", ...");
} else {
SB_AppendStr (&ParamList, "...");
}
}
SB_Terminate (&ParamList);
/* Get the function qualifiers */
if (GetQualifierTypeCodeNameBuf (&Buf, T->C, T_QUAL_NONE) > 0) {
/* Append a space between the qualifiers and the name */
SB_AppendChar (&Buf, ' ');
}
SB_Terminate (&Buf);
/* Get the signature string without the return type */
SB_Printf (&West, "%s%s (%s)", SB_GetConstBuf (&Buf), Name, SB_GetConstBuf (&ParamList));
SB_Done (&Buf);
SB_Done (&ParamList);
/* Complete with the return type */
GetFullTypeNameWestEast (&West, &East, GetFuncReturn (T));
SB_Append (&West, &East);
SB_Terminate (&West);
/* Output */
fprintf (F, "%s", SB_GetConstBuf (&West));
SB_Done (&East);
SB_Done (&West);
}
void PrintRawType (FILE* F, const Type* T)
/* Print a type string in raw hex format (for debugging) */
{
while (T->C != T_END) {
fprintf (F, "%04lX ", T->C);
++T;
}
fprintf (F, "\n");
}
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