unsigned GetSymInfoFlags (const SymEntry* S, long* ConstVal)
/* Return a set of flags used when writing symbol information into a file.
** If the SYM_CONST bit is set, ConstVal will contain the constant value
** of the symbol. The result does not include the condes count.
** See common/symdefs.h for more information.
*/
{
/* Setup info flags */
unsigned Flags = 0;
Flags |= SymIsConst (S, ConstVal)? SYM_CONST : SYM_EXPR;
Flags |= (S->Flags & SF_LABEL)? SYM_LABEL : SYM_EQUATE;
Flags |= (S->Flags & SF_LOCAL)? SYM_CHEAP_LOCAL : SYM_STD;
if (S->Flags & SF_EXPORT) {
Flags |= SYM_EXPORT;
}
if (S->Flags & SF_IMPORT) {
Flags |= SYM_IMPORT;
}
/* Return the result */
return Flags;
}
void WriteScopes (void)
/* Write the scope table to the object file */
{
/* Tell the object file module that we're about to start the scopes */
ObjStartScopes ();
/* We will write scopes only if debug symbols are requested */
if (DbgSyms) {
/* Get head of list */
SymTable* S = RootScope;
/* Write the scope count to the file */
ObjWriteVar (ScopeCount);
/* Walk through all scopes and write them to the file */
while (S) {
/* Flags for this scope */
unsigned Flags = 0;
/* Check if this scope has a size. If so, remember it in the
** flags.
*/
long Size;
SymEntry* SizeSym = FindSizeOfScope (S);
if (SizeSym != 0 && SymIsConst (SizeSym, &Size)) {
Flags |= SCOPE_SIZE;
}
/* Check if the scope has a label */
if (S->Label) {
Flags |= SCOPE_LABELED;
}
/* Scope must be defined */
CHECK (S->Type != SCOPE_UNDEF);
/* Id of parent scope */
if (S->Parent) {
ObjWriteVar (S->Parent->Id);
} else {
ObjWriteVar (0);
}
/* Lexical level */
ObjWriteVar (S->Level);
/* Scope flags */
ObjWriteVar (Flags);
/* Type of scope */
ObjWriteVar (S->Type);
/* Name of the scope */
ObjWriteVar (S->Name);
/* If the scope has a size, write it to the file */
if (SCOPE_HAS_SIZE (Flags)) {
ObjWriteVar (Size);
}
/* If the scope has a label, write its id to the file */
if (SCOPE_HAS_LABEL (Flags)) {
ObjWriteVar (S->Label->DebugSymId);
}
/* Spans for this scope */
WriteSpanList (&S->Spans);
/* Next scope */
S = S->Next;
}
} else {
/* No debug info requested */
ObjWriteVar (0);
}
/* Done writing the scopes */
ObjEndScopes ();
}
void WriteDbgSyms (void)
/* Write a list of all symbols to the object file */
{
unsigned Count;
SymEntry* S;
/* Tell the object file module that we're about to start the debug info */
ObjStartDbgSyms ();
/* Check if debug info is requested */
if (DbgSyms) {
/* Walk through the list, give each symbol an id and count them */
Count = 0;
S = SymList;
while (S) {
if (IsDbgSym (S)) {
S->DebugSymId = Count++;
}
S = S->List;
}
/* Write the symbol count to the list */
ObjWriteVar (Count);
/* Walk through list and write all symbols to the file. Ignore size
** symbols.
*/
S = SymList;
while (S) {
if (IsDbgSym (S)) {
/* Get the expression bits and the value */
long ConstVal;
unsigned SymFlags = GetSymInfoFlags (S, &ConstVal);
/* Check if this symbol has a size. If so, remember it in the
** flags.
*/
long Size;
SymEntry* SizeSym = FindSizeOfSymbol (S);
if (SizeSym != 0 && SymIsConst (SizeSym, &Size)) {
SymFlags |= SYM_SIZE;
}
/* Write the type */
ObjWriteVar (SymFlags);
/* Write the address size */
ObjWrite8 (S->AddrSize);
/* Write the id of the parent. For normal symbols, this is a
** scope (symbol table), for cheap locals, it's a symbol.
*/
if (SYM_IS_STD (SymFlags)) {
ObjWriteVar (S->Sym.Tab->Id);
} else {
ObjWriteVar (S->Sym.Entry->DebugSymId);
}
/* Write the name */
ObjWriteVar (S->Name);
/* Write the value */
if (SYM_IS_CONST (SymFlags)) {
/* Constant value */
ObjWrite32 (ConstVal);
} else {
/* Expression involved */
WriteExpr (S->Expr);
}
/* If the symbol has a size, write it to the file */
if (SYM_HAS_SIZE (SymFlags)) {
ObjWriteVar (Size);
}
/* If the symbol is an im- or export, write out the ids */
if (SYM_IS_IMPORT (SymFlags)) {
ObjWriteVar (GetSymImportId (S));
}
if (SYM_IS_EXPORT (SymFlags)) {
ObjWriteVar (GetSymExportId (S));
}
/* Write the line infos */
WriteLineInfo (&S->DefLines);
WriteLineInfo (&S->RefLines);
}
S = S->List;
}
} else {
/* No debug symbols */
ObjWriteVar (0);
}
/* Write the high level symbols */
WriteHLLDbgSyms ();
/* Done writing debug symbols */
ObjEndDbgSyms ();
}
void WriteExports (void)
/* Write the exports list to the object file */
{
SymEntry* S;
unsigned Type;
/* Tell the object file module that we're about to start the exports */
ObjStartExports ();
/* Write the export count to the list */
ObjWriteVar (ExportCount);
/* Walk throught list and write all exports to the file */
S = SymList;
while (S) {
if ((S->Flags & (SF_UNUSED | SF_EXPORT)) == SF_EXPORT) {
/* Get the expression bits and the value */
long ConstVal;
unsigned SymFlags = GetSymInfoFlags (S, &ConstVal);
/* Check if this symbol has a size. If so, remember it in the
** flags.
*/
long Size;
SymEntry* SizeSym = FindSizeOfSymbol (S);
if (SizeSym != 0 && SymIsConst (SizeSym, &Size)) {
SymFlags |= SYM_SIZE;
}
/* Count the number of ConDes types */
for (Type = 0; Type < CD_TYPE_COUNT; ++Type) {
if (S->ConDesPrio[Type] != CD_PRIO_NONE) {
SYM_INC_CONDES_COUNT (SymFlags);
}
}
/* Write the type and the export size */
ObjWriteVar (SymFlags);
ObjWrite8 (S->ExportSize);
/* Write any ConDes declarations */
if (SYM_GET_CONDES_COUNT (SymFlags) > 0) {
for (Type = 0; Type < CD_TYPE_COUNT; ++Type) {
unsigned char Prio = S->ConDesPrio[Type];
if (Prio != CD_PRIO_NONE) {
ObjWrite8 (CD_BUILD (Type, Prio));
}
}
}
/* Write the name */
ObjWriteVar (S->Name);
/* Write the value */
if (SYM_IS_CONST (SymFlags)) {
/* Constant value */
ObjWrite32 (ConstVal);
} else {
/* Expression involved */
WriteExpr (S->Expr);
}
/* If the symbol has a size, write it to the file */
if (SYM_HAS_SIZE (SymFlags)) {
ObjWriteVar (Size);
}
/* Write the line infos */
WriteLineInfo (&S->DefLines);
WriteLineInfo (&S->RefLines);
}
S = S->List;
}
/* Done writing exports */
ObjEndExports ();
}
static long DoStructInternal (long Offs, unsigned Type)
/* Handle the .STRUCT command */
{
long Size = 0;
/* Outside of other structs, we need a name. Inside another struct or
** union, the struct may be anonymous, in which case no new lexical level
** is started.
*/
int Anon = (CurTok.Tok != TOK_IDENT);
if (!Anon) {
/* Enter a new scope, then skip the name */
SymEnterLevel (&CurTok.SVal, SCOPE_STRUCT, ADDR_SIZE_ABS, 0);
NextTok ();
/* Start at zero offset in the new scope */
Offs = 0;
}
/* Test for end of line */
ConsumeSep ();
/* Read until end of struct */
while (CurTok.Tok != TOK_ENDSTRUCT &&
CurTok.Tok != TOK_ENDUNION &&
CurTok.Tok != TOK_EOF) {
long MemberSize;
SymTable* Struct;
SymEntry* Sym;
/* Allow empty and comment lines */
if (CurTok.Tok == TOK_SEP) {
NextTok ();
continue;
}
/* The format is "[identifier] storage-allocator [, multiplicator]" */
Sym = 0;
if (CurTok.Tok == TOK_IDENT) {
/* Beware: An identifier may also be a macro, in which case we have
** to start over.
*/
Macro* M = FindMacro (&CurTok.SVal);
if (M) {
MacExpandStart (M);
continue;
}
/* We have an identifier, generate a symbol */
Sym = SymFind (CurrentScope, &CurTok.SVal, SYM_ALLOC_NEW);
/* Assign the symbol the offset of the current member */
SymDef (Sym, GenLiteralExpr (Offs), ADDR_SIZE_DEFAULT, SF_NONE);
/* Skip the member name */
NextTok ();
}
/* Read storage allocators */
MemberSize = 0; /* In case of errors, use zero */
switch (CurTok.Tok) {
case TOK_BYTE:
NextTok ();
MemberSize = Member (1);
break;
case TOK_DBYT:
case TOK_WORD:
case TOK_ADDR:
NextTok ();
MemberSize = Member (2);
break;
case TOK_FARADDR:
NextTok ();
MemberSize = Member (3);
break;
case TOK_DWORD:
NextTok ();
MemberSize = Member (4);
break;
case TOK_RES:
NextTok ();
if (CurTok.Tok == TOK_SEP) {
ErrorSkip ("Size is missing");
} else {
MemberSize = Member (1);
}
break;
case TOK_TAG:
NextTok ();
Struct = ParseScopedSymTable ();
if (Struct == 0) {
ErrorSkip ("Unknown struct/union");
} else if (GetSymTabType (Struct) != SCOPE_STRUCT) {
ErrorSkip ("Not a struct/union");
} else {
SymEntry* SizeSym = GetSizeOfScope (Struct);
if (!SymIsDef (SizeSym) || !SymIsConst (SizeSym, &MemberSize)) {
ErrorSkip ("Size of struct/union is unknown");
}
}
MemberSize = Member (MemberSize);
break;
case TOK_STRUCT:
NextTok ();
MemberSize = DoStructInternal (Offs, STRUCT);
break;
case TOK_UNION:
NextTok ();
MemberSize = DoStructInternal (Offs, UNION);
break;
default:
if (!CheckConditionals ()) {
/* Not a conditional directive */
ErrorSkip ("Invalid storage allocator in struct/union");
}
}
/* Assign the size to the member if it has a name */
if (Sym) {
DefSizeOfSymbol (Sym, MemberSize);
}
/* Next member */
if (Type == STRUCT) {
/* Struct */
Offs += MemberSize;
Size += MemberSize;
} else {
/* Union */
if (MemberSize > Size) {
Size = MemberSize;
}
}
/* Expect end of line */
ConsumeSep ();
}
/* If this is not a anon struct, enter a special symbol named ".size"
** into the symbol table of the struct that holds the size of the
** struct. Since the symbol starts with a dot, it cannot be accessed
** by user code.
** Leave the struct scope level.
*/
if (!Anon) {
/* Add a symbol */
SymEntry* SizeSym = GetSizeOfScope (CurrentScope);
SymDef (SizeSym, GenLiteralExpr (Size), ADDR_SIZE_DEFAULT, SF_NONE);
/* Close the struct scope */
SymLeaveLevel ();
}
/* End of struct/union definition */
if (Type == STRUCT) {
Consume (TOK_ENDSTRUCT, "'.ENDSTRUCT' expected");
} else {
Consume (TOK_ENDUNION, "'.ENDUNION' expected");
}
/* Return the size of the struct */
return Size;
}
