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When initialized data is found in a segment, print the first module where this

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data comes from to ease debugging.
This commit is contained in:
Kugel Fuhr
2025-07-10 21:23:41 +02:00
parent 2e3edf9b1b
commit c2f17b6f6b
3 changed files with 29 additions and 13 deletions
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18
src/ld65/config.c
View File

@@ -1709,10 +1709,20 @@ static void ProcessSegments (void)
** in any of the object file, check that there's no initialized data
** in the segment.
*/
if ((S->Flags & SF_BSS) != 0 && S->Seg != 0 && !IsBSSType (S->Seg)) {
PWarning (GetSourcePos (S->LI),
"Segment `%s' with type `bss' contains initialized data",
GetString (S->Name));
if ((S->Flags & SF_BSS) != 0 && S->Seg != 0) {
Section* Sec = GetNonBSSSection (S->Seg);
if (Sec) {
const FilePos* Pos = GetSourcePos (S->LI);
if (Sec->Obj) {
AddPNote (Pos, "Initialized data comes at least partially "
"from `%s'", GetString (Sec->Obj->Name));
} else {
AddPNote (Pos, "Initialized data is at least partially "
"linker generated");
}
PWarning (Pos, "Segment `%s' with type `bss' contains "
"initialized data", GetString (S->Name));
}
}
/* If this segment does exist in any of the object files, insert the

16
src/ld65/segments.c
View File

@@ -306,9 +306,11 @@ Segment* SegFind (unsigned Name)
int IsBSSType (Segment* S)
/* Check if the given segment is a BSS style segment, that is, it does not
** contain non-zero data.
Section* GetNonBSSSection (Segment* S)
/* Used when checking a BSS style segment for initialized data. Will walk over
** all sections in S and check if any of them contains initialized data. If so,
** the first section containing initialized data is returned. Otherwise the
** function returns NULL.
*/
{
/* Loop over all sections */
@@ -326,18 +328,20 @@ int IsBSSType (Segment* S)
unsigned long Count = F->Size;
while (Count--) {
if (*Data++ != 0) {
return 0;
return Sec;
}
}
} else if (F->Type == FRAG_EXPR || F->Type == FRAG_SEXPR) {
if (GetExprVal (F->Expr) != 0) {
return 0;
return Sec;
}
}
F = F->Next;
}
}
return 1;
/* No uninitialized data found */
return 0;
}

8
src/ld65/segments.h
View File

@@ -131,9 +131,11 @@ Section* ReadSection (FILE* F, struct ObjData* O);
Segment* SegFind (unsigned Name);
/* Return the given segment or NULL if not found. */
int IsBSSType (Segment* S);
/* Check if the given segment is a BSS style segment, that is, it does not
** contain non-zero data.
Section* GetNonBSSSection (Segment* S);
/* Used when checking a BSS style segment for initialized data. Will walk over
** all sections in S and check if any of them contains initialized data. If so,
** the first section containing initialized data is returned. Otherwise the
** function returns NULL.
*/
void SegDump (void);