/*****************************************************************************/
/* */
-/* codeseg.c */
+/* codeseg.c */
/* */
-/* Code segment structure */
+/* Code segment structure */
/* */
/* */
/* */
/*****************************************************************************/
-/* Helper functions */
+/* Helper functions */
/*****************************************************************************/
unsigned LabelCount = CollCount (&S->Labels);
for (I = 0; I < LabelCount; ++I) {
- /* Get the label */
- CodeLabel* L = CollAt (&S->Labels, I);
+ /* Get the label */
+ CodeLabel* L = CollAt (&S->Labels, I);
- /* Attach it to the entry */
- CE_AttachLabel (E, L);
+ /* Attach it to the entry */
+ CE_AttachLabel (E, L);
}
/* Delete the transfered labels */
{
unsigned LabelCount = CE_GetLabelCount (E);
while (LabelCount--) {
- CodeLabel* L = CE_GetLabel (E, LabelCount);
- L->Owner = 0;
- CollAppend (&S->Labels, L);
+ CodeLabel* L = CE_GetLabel (E, LabelCount);
+ L->Owner = 0;
+ CollAppend (&S->Labels, L);
}
CollDeleteAll (&E->Labels);
}
/* Search the list */
while (L) {
- if (strcmp (Name, L->Name) == 0) {
- /* Found */
- break;
- }
- L = L->Next;
+ if (strcmp (Name, L->Name) == 0) {
+ /* Found */
+ break;
+ }
+ L = L->Next;
}
return L;
}
/* First, remove the label from the hash chain */
if (List == L) {
- /* First entry in hash chain */
- S->LabelHash[L->Hash] = L->Next;
+ /* First entry in hash chain */
+ S->LabelHash[L->Hash] = L->Next;
} else {
- /* Must search through the chain */
- while (List->Next != L) {
- /* If we've reached the end of the chain, something is *really* wrong */
- CHECK (List->Next != 0);
- /* Next entry */
- List = List->Next;
- }
- /* The next entry is the one, we have been searching for */
- List->Next = L->Next;
+ /* Must search through the chain */
+ while (List->Next != L) {
+ /* If we've reached the end of the chain, something is *really* wrong */
+ CHECK (List->Next != 0);
+ /* Next entry */
+ List = List->Next;
+ }
+ /* The next entry is the one, we have been searching for */
+ List->Next = L->Next;
}
}
/*****************************************************************************/
-/* Functions for parsing instructions */
+/* Functions for parsing instructions */
/*****************************************************************************/
/* Skip white space and return an updated pointer */
{
while (IsSpace (*S)) {
- ++S;
+ ++S;
}
return S;
}
static const char* ReadToken (const char* L, const char* Term,
- char* Buf, unsigned BufSize)
+ char* Buf, unsigned BufSize)
/* Read the next token into Buf, return the updated line pointer. The
* token is terminated by one of the characters given in term.
*/
unsigned I = 0;
unsigned ParenCount = 0;
while (*L && (ParenCount > 0 || strchr (Term, *L) == 0)) {
- if (I < BufSize-1) {
- Buf[I] = *L;
- } else if (I == BufSize-1) {
- /* Cannot store this character, this is an input error (maybe
- * identifier too long or similar).
- */
- Error ("ASM code error: syntax error");
- }
- ++I;
- if (*L == ')') {
- --ParenCount;
- } else if (*L == '(') {
- ++ParenCount;
- }
- ++L;
+ if (I < BufSize-1) {
+ Buf[I] = *L;
+ } else if (I == BufSize-1) {
+ /* Cannot store this character, this is an input error (maybe
+ * identifier too long or similar).
+ */
+ Error ("ASM code error: syntax error");
+ }
+ ++I;
+ if (*L == ')') {
+ --ParenCount;
+ } else if (*L == '(') {
+ ++ParenCount;
+ }
+ ++L;
}
/* Terminate the buffer contents */
*/
{
char Mnemo[IDENTSIZE+10];
- const OPCDesc* OPC;
- am_t AM = 0; /* Initialize to keep gcc silent */
+ const OPCDesc* OPC;
+ am_t AM = 0; /* Initialize to keep gcc silent */
char Arg[IDENTSIZE+10];
- char Reg;
- CodeEntry* E;
- CodeLabel* Label;
+ char Reg;
+ CodeEntry* E;
+ CodeLabel* Label;
/* Read the first token and skip white space after it */
L = SkipSpace (ReadToken (L, " \t:", Mnemo, sizeof (Mnemo)));
/* Check if we have a label */
if (*L == ':') {
- /* Skip the colon and following white space */
- L = SkipSpace (L+1);
+ /* Skip the colon and following white space */
+ L = SkipSpace (L+1);
- /* Add the label */
- CS_AddLabel (S, Mnemo);
+ /* Add the label */
+ CS_AddLabel (S, Mnemo);
- /* If we have reached end of line, bail out, otherwise a mnemonic
- * may follow.
- */
- if (*L == '\0') {
- return 0;
- }
+ /* If we have reached end of line, bail out, otherwise a mnemonic
+ * may follow.
+ */
+ if (*L == '\0') {
+ return 0;
+ }
- L = SkipSpace (ReadToken (L, " \t", Mnemo, sizeof (Mnemo)));
+ L = SkipSpace (ReadToken (L, " \t", Mnemo, sizeof (Mnemo)));
}
/* Try to find the opcode description for the mnemonic */
/* If we didn't find the opcode, print an error and bail out */
if (OPC == 0) {
- Error ("ASM code error: %s is not a valid mnemonic", Mnemo);
- return 0;
+ Error ("ASM code error: %s is not a valid mnemonic", Mnemo);
+ return 0;
}
/* Get the addressing mode */
Arg[0] = '\0';
switch (*L) {
- case '\0':
- /* Implicit or accu */
+ case '\0':
+ /* Implicit or accu */
if (OPC->Info & OF_NOIMP) {
AM = AM65_ACC;
} else {
AM = AM65_IMP;
}
- break;
-
- case '#':
- /* Immidiate */
- StrCopy (Arg, sizeof (Arg), L+1);
- AM = AM65_IMM;
- break;
-
- case '(':
- /* Indirect */
- L = ReadToken (L+1, ",)", Arg, sizeof (Arg));
-
- /* Check for errors */
- if (*L == '\0') {
- Error ("ASM code error: syntax error");
- return 0;
- }
-
- /* Check the different indirect modes */
- if (*L == ',') {
- /* Expect zp x indirect */
- L = SkipSpace (L+1);
- if (toupper (*L) != 'X') {
- Error ("ASM code error: `X' expected");
- return 0;
- }
- L = SkipSpace (L+1);
- if (*L != ')') {
- Error ("ASM code error: `)' expected");
- return 0;
- }
- L = SkipSpace (L+1);
- if (*L != '\0') {
- Error ("ASM code error: syntax error");
- return 0;
- }
- AM = AM65_ZPX_IND;
- } else if (*L == ')') {
- /* zp indirect or zp indirect, y */
- L = SkipSpace (L+1);
- if (*L == ',') {
- L = SkipSpace (L+1);
- if (toupper (*L) != 'Y') {
- Error ("ASM code error: `Y' expected");
- return 0;
- }
- L = SkipSpace (L+1);
- if (*L != '\0') {
- Error ("ASM code error: syntax error");
- return 0;
- }
- AM = AM65_ZP_INDY;
- } else if (*L == '\0') {
- AM = AM65_ZP_IND;
- } else {
- Error ("ASM code error: syntax error");
- return 0;
- }
- }
- break;
-
- case 'a':
- case 'A':
- /* Accumulator? */
- if (L[1] == '\0') {
- AM = AM65_ACC;
- break;
- }
- /* FALLTHROUGH */
-
- default:
- /* Absolute, maybe indexed */
- L = ReadToken (L, ",", Arg, sizeof (Arg));
- if (*L == '\0') {
- /* Absolute, zeropage or branch */
- if ((OPC->Info & OF_BRA) != 0) {
- /* Branch */
- AM = AM65_BRA;
- } else if (GetZPInfo(Arg) != 0) {
- AM = AM65_ZP;
- } else {
+ break;
+
+ case '#':
+ /* Immidiate */
+ StrCopy (Arg, sizeof (Arg), L+1);
+ AM = AM65_IMM;
+ break;
+
+ case '(':
+ /* Indirect */
+ L = ReadToken (L+1, ",)", Arg, sizeof (Arg));
+
+ /* Check for errors */
+ if (*L == '\0') {
+ Error ("ASM code error: syntax error");
+ return 0;
+ }
+
+ /* Check the different indirect modes */
+ if (*L == ',') {
+ /* Expect zp x indirect */
+ L = SkipSpace (L+1);
+ if (toupper (*L) != 'X') {
+ Error ("ASM code error: `X' expected");
+ return 0;
+ }
+ L = SkipSpace (L+1);
+ if (*L != ')') {
+ Error ("ASM code error: `)' expected");
+ return 0;
+ }
+ L = SkipSpace (L+1);
+ if (*L != '\0') {
+ Error ("ASM code error: syntax error");
+ return 0;
+ }
+ AM = AM65_ZPX_IND;
+ } else if (*L == ')') {
+ /* zp indirect or zp indirect, y */
+ L = SkipSpace (L+1);
+ if (*L == ',') {
+ L = SkipSpace (L+1);
+ if (toupper (*L) != 'Y') {
+ Error ("ASM code error: `Y' expected");
+ return 0;
+ }
+ L = SkipSpace (L+1);
+ if (*L != '\0') {
+ Error ("ASM code error: syntax error");
+ return 0;
+ }
+ AM = AM65_ZP_INDY;
+ } else if (*L == '\0') {
+ AM = AM65_ZP_IND;
+ } else {
+ Error ("ASM code error: syntax error");
+ return 0;
+ }
+ }
+ break;
+
+ case 'a':
+ case 'A':
+ /* Accumulator? */
+ if (L[1] == '\0') {
+ AM = AM65_ACC;
+ break;
+ }
+ /* FALLTHROUGH */
+
+ default:
+ /* Absolute, maybe indexed */
+ L = ReadToken (L, ",", Arg, sizeof (Arg));
+ if (*L == '\0') {
+ /* Absolute, zeropage or branch */
+ if ((OPC->Info & OF_BRA) != 0) {
+ /* Branch */
+ AM = AM65_BRA;
+ } else if (GetZPInfo(Arg) != 0) {
+ AM = AM65_ZP;
+ } else {
/* Check for subroutine call to local label */
if ((OPC->Info & OF_CALL) && IsLocalLabelName (Arg)) {
Error ("ASM code error: "
"Cannot use local label `%s' in subroutine call",
Arg);
}
- AM = AM65_ABS;
- }
- } else if (*L == ',') {
- /* Indexed */
- L = SkipSpace (L+1);
- if (*L == '\0') {
- Error ("ASM code error: syntax error");
- return 0;
- } else {
- Reg = toupper (*L);
- L = SkipSpace (L+1);
- if (Reg == 'X') {
- if (GetZPInfo(Arg) != 0) {
- AM = AM65_ZPX;
- } else {
- AM = AM65_ABSX;
- }
- } else if (Reg == 'Y') {
- AM = AM65_ABSY;
- } else {
- Error ("ASM code error: syntax error");
- return 0;
- }
- if (*L != '\0') {
- Error ("ASM code error: syntax error");
- return 0;
- }
- }
- }
- break;
+ AM = AM65_ABS;
+ }
+ } else if (*L == ',') {
+ /* Indexed */
+ L = SkipSpace (L+1);
+ if (*L == '\0') {
+ Error ("ASM code error: syntax error");
+ return 0;
+ } else {
+ Reg = toupper (*L);
+ L = SkipSpace (L+1);
+ if (Reg == 'X') {
+ if (GetZPInfo(Arg) != 0) {
+ AM = AM65_ZPX;
+ } else {
+ AM = AM65_ABSX;
+ }
+ } else if (Reg == 'Y') {
+ AM = AM65_ABSY;
+ } else {
+ Error ("ASM code error: syntax error");
+ return 0;
+ }
+ if (*L != '\0') {
+ Error ("ASM code error: syntax error");
+ return 0;
+ }
+ }
+ }
+ break;
}
Label = 0;
if (AM == AM65_BRA) {
- /* Generate the hash over the label, then search for the label */
- unsigned Hash = HashStr (Arg) % CS_LABEL_HASH_SIZE;
- Label = CS_FindLabel (S, Arg, Hash);
+ /* Generate the hash over the label, then search for the label */
+ unsigned Hash = HashStr (Arg) % CS_LABEL_HASH_SIZE;
+ Label = CS_FindLabel (S, Arg, Hash);
- /* If we don't have the label, it's a forward ref - create it */
- if (Label == 0) {
- /* Generate a new label */
- Label = CS_NewCodeLabel (S, Arg, Hash);
- }
+ /* If we don't have the label, it's a forward ref - create it */
+ if (Label == 0) {
+ /* Generate a new label */
+ Label = CS_NewCodeLabel (S, Arg, Hash);
+ }
}
/* We do now have the addressing mode in AM. Allocate a new CodeEntry
/*****************************************************************************/
-/* Code */
+/* Code */
/*****************************************************************************/
/* Initialize the fields */
S->SegName = xstrdup (SegName);
- S->Func = Func;
+ S->Func = Func;
InitCollection (&S->Entries);
InitCollection (&S->Labels);
for (I = 0; I < sizeof(S->LabelHash) / sizeof(S->LabelHash[0]); ++I) {
- S->LabelHash[I] = 0;
+ S->LabelHash[I] = 0;
}
/* If we have a function given, get the return type of the function.
* Assume ANY return type besides void will use the A and X registers.
*/
if (S->Func && !IsTypeVoid ((RetType = GetFuncReturn (Func->Type)))) {
- if (SizeOf (RetType) == SizeOf (type_long)) {
- S->ExitRegs = REG_EAX;
- } else {
- S->ExitRegs = REG_AX;
- }
+ if (SizeOf (RetType) == SizeOf (type_long)) {
+ S->ExitRegs = REG_EAX;
+ } else {
+ S->ExitRegs = REG_AX;
+ }
} else {
- S->ExitRegs = REG_NONE;
+ S->ExitRegs = REG_NONE;
}
/* Copy the global optimization settings */
L = SkipSpace (SB_GetConstBuf (&Buf));
/* Check which type of instruction we have */
- E = 0; /* Assume no insn created */
+ E = 0; /* Assume no insn created */
switch (*L) {
- case '\0':
- /* Empty line, just ignore it */
- break;
+ case '\0':
+ /* Empty line, just ignore it */
+ break;
- case ';':
- /* Comment or hint, ignore it for now */
- break;
+ case ';':
+ /* Comment or hint, ignore it for now */
+ break;
- case '.':
- /* Control instruction */
- ReadToken (L, " \t", Token, sizeof (Token));
- Error ("ASM code error: Pseudo instruction `%s' not supported", Token);
- break;
+ case '.':
+ /* Control instruction */
+ ReadToken (L, " \t", Token, sizeof (Token));
+ Error ("ASM code error: Pseudo instruction `%s' not supported", Token);
+ break;
- default:
- E = ParseInsn (S, LI, L);
- break;
+ default:
+ E = ParseInsn (S, LI, L);
+ break;
}
/* If we have a code entry, transfer the labels and insert it */
if (E) {
- CS_AddEntry (S, E);
+ CS_AddEntry (S, E);
}
/* Cleanup the string buffer */
unsigned Count = CE_GetLabelCount (E);
if (Count > 0) {
- /* The instruction has labels attached. Check if there is a next
- * instruction.
- */
- if (Index == CS_GetEntryCount (S)-1) {
+ /* The instruction has labels attached. Check if there is a next
+ * instruction.
+ */
+ if (Index == CS_GetEntryCount (S)-1) {
- /* No next instruction, move to the codeseg label pool */
- CS_MoveLabelsToPool (S, E);
+ /* No next instruction, move to the codeseg label pool */
+ CS_MoveLabelsToPool (S, E);
- } else {
+ } else {
- /* There is a next insn, get it */
- CodeEntry* N = CS_GetEntry (S, Index+1);
+ /* There is a next insn, get it */
+ CodeEntry* N = CS_GetEntry (S, Index+1);
- /* Move labels to the next entry */
- CS_MoveLabels (S, E, N);
+ /* Move labels to the next entry */
+ CS_MoveLabels (S, E, N);
- }
+ }
}
/* If this insn references a label, remove the reference. And, if the
* the reference count for this label drops to zero, remove this label.
*/
if (E->JumpTo) {
- /* Remove the reference */
- CS_RemoveLabelRef (S, E);
+ /* Remove the reference */
+ CS_RemoveLabelRef (S, E);
}
/* Delete the pointer to the insn */
* memory moving.
*/
while (Count--) {
- CS_DelEntry (S, Start + Count);
+ CS_DelEntry (S, Start + Count);
}
}
* label pool to the first instruction of the moved range.
*/
if (NewPos == CS_GetEntryCount (S)) {
- CS_MoveLabelsToEntry (S, CS_GetEntry (S, Start));
+ CS_MoveLabelsToEntry (S, CS_GetEntry (S, Start));
}
/* Move the code block to the destination */
*/
{
if (Index == 0) {
- /* This is the first entry */
- return 0;
+ /* This is the first entry */
+ return 0;
} else {
- /* Previous entry available */
- return CollAtUnchecked (&S->Entries, Index-1);
+ /* Previous entry available */
+ return CollAtUnchecked (&S->Entries, Index-1);
}
}
*/
{
if (Index >= CollCount (&S->Entries)-1) {
- /* This is the last entry */
- return 0;
+ /* This is the last entry */
+ return 0;
} else {
- /* Code entries left */
- return CollAtUnchecked (&S->Entries, Index+1);
+ /* Code entries left */
+ return CollAtUnchecked (&S->Entries, Index+1);
}
}
int CS_GetEntries (CodeSeg* S, struct CodeEntry** List,
- unsigned Start, unsigned Count)
+ unsigned Start, unsigned Count)
/* Get Count code entries into List starting at index start. Return true if
* we got the lines, return false if not enough lines were available.
*/
{
/* Check if enough entries are available */
if (Start + Count > CollCount (&S->Entries)) {
- return 0;
+ return 0;
}
/* Copy the entries */
while (Count--) {
- *List++ = CollAtUnchecked (&S->Entries, Start++);
+ *List++ = CollAtUnchecked (&S->Entries, Start++);
}
/* We have the entries */
/* Adjust count. We expect at least Start to be valid. */
CHECK (Start < EntryCount);
if (Start + Count > EntryCount) {
- Count = EntryCount - Start;
+ Count = EntryCount - Start;
}
/* Check each entry. Since we have validated the index above, we may
* use the unchecked access function in the loop which is faster.
*/
while (Count--) {
- const CodeEntry* E = CollAtUnchecked (&S->Entries, Start++);
- if (CE_HasLabel (E)) {
- return 1;
- }
+ const CodeEntry* E = CollAtUnchecked (&S->Entries, Start++);
+ if (CE_HasLabel (E)) {
+ return 1;
+ }
}
/* No label in the complete range */
/* Did we find it? */
if (L) {
- /* We found it - be sure it does not already have an owner */
- if (L->Owner) {
- Error ("ASM label `%s' is already defined", Name);
+ /* We found it - be sure it does not already have an owner */
+ if (L->Owner) {
+ Error ("ASM label `%s' is already defined", Name);
return L;
- }
+ }
} else {
- /* Not found - create a new one */
- L = CS_NewCodeLabel (S, Name, Hash);
+ /* Not found - create a new one */
+ L = CS_NewCodeLabel (S, Name, Hash);
}
/* Safety. This call is quite costly, but safety is better */
if (CollIndex (&S->Labels, L) >= 0) {
- Error ("ASM label `%s' is already defined", Name);
+ Error ("ASM label `%s' is already defined", Name);
return L;
}
if (CE_HasLabel (E)) {
- /* Get the label from this entry */
- L = CE_GetLabel (E, 0);
+ /* Get the label from this entry */
+ L = CE_GetLabel (E, 0);
} else {
- /* Get a new name */
- const char* Name = LocalLabelName (GetLocalLabel ());
+ /* Get a new name */
+ const char* Name = LocalLabelName (GetLocalLabel ());
- /* Generate the hash over the name */
- unsigned Hash = HashStr (Name) % CS_LABEL_HASH_SIZE;
+ /* Generate the hash over the name */
+ unsigned Hash = HashStr (Name) % CS_LABEL_HASH_SIZE;
- /* Create a new label */
- L = CS_NewCodeLabel (S, Name, Hash);
+ /* Create a new label */
+ L = CS_NewCodeLabel (S, Name, Hash);
- /* Attach this label to the code entry */
- CE_AttachLabel (E, L);
+ /* Attach this label to the code entry */
+ CE_AttachLabel (E, L);
}
/* Remove references from insns jumping to this label */
Count = CollCount (&L->JumpFrom);
for (I = 0; I < Count; ++I) {
- /* Get the insn referencing this label */
- CodeEntry* E = CollAt (&L->JumpFrom, I);
- /* Remove the reference */
- CE_ClearJumpTo (E);
+ /* Get the insn referencing this label */
+ CodeEntry* E = CollAt (&L->JumpFrom, I);
+ /* Remove the reference */
+ CE_ClearJumpTo (E);
}
CollDeleteAll (&L->JumpFrom);
* errors to slip through.
*/
if (L->Owner) {
- CollDeleteItem (&L->Owner->Labels, L);
+ CollDeleteItem (&L->Owner->Labels, L);
}
/* All references removed, delete the label itself */
*/
for (I = 0; I < CS_LABEL_HASH_SIZE; ++I) {
- /* Get the first label in this hash chain */
- CodeLabel** L = &S->LabelHash[I];
- while (*L) {
- if ((*L)->Owner == 0) {
+ /* Get the first label in this hash chain */
+ CodeLabel** L = &S->LabelHash[I];
+ while (*L) {
+ if ((*L)->Owner == 0) {
- /* The label does not have an owner, remove it from the chain */
- CodeLabel* X = *L;
- *L = X->Next;
+ /* The label does not have an owner, remove it from the chain */
+ CodeLabel* X = *L;
+ *L = X->Next;
- /* Cleanup any entries jumping to this label */
- for (J = 0; J < CL_GetRefCount (X); ++J) {
- /* Get the entry referencing this label */
- CodeEntry* E = CL_GetRef (X, J);
- /* And remove the reference. Do NOT call CE_ClearJumpTo
+ /* Cleanup any entries jumping to this label */
+ for (J = 0; J < CL_GetRefCount (X); ++J) {
+ /* Get the entry referencing this label */
+ CodeEntry* E = CL_GetRef (X, J);
+ /* And remove the reference. Do NOT call CE_ClearJumpTo
* here, because this will also clear the label name,
* which is not what we want.
*/
- E->JumpTo = 0;
- }
-
- /* Print some debugging output */
- if (Debug) {
- printf ("Removing unused global label `%s'", X->Name);
- }
-
- /* And free the label */
- FreeCodeLabel (X);
- } else {
- /* Label is owned, point to next code label pointer */
- L = &((*L)->Next);
- }
- }
+ E->JumpTo = 0;
+ }
+
+ /* Print some debugging output */
+ if (Debug) {
+ printf ("Removing unused global label `%s'", X->Name);
+ }
+
+ /* And free the label */
+ FreeCodeLabel (X);
+ } else {
+ /* Label is owned, point to next code label pointer */
+ L = &((*L)->Next);
+ }
+ }
}
/* Walk over all code entries */
for (I = 0; I < CS_GetEntryCount (S); ++I) {
- CodeLabel* RefLab;
- unsigned J;
-
- /* Get a pointer to the next entry */
- CodeEntry* E = CS_GetEntry (S, I);
-
- /* If this entry has zero labels, continue with the next one */
- unsigned LabelCount = CE_GetLabelCount (E);
- if (LabelCount == 0) {
- continue;
- }
-
- /* We have at least one label. Use the first one as reference label. */
- RefLab = CE_GetLabel (E, 0);
-
- /* Walk through the remaining labels and change references to these
- * labels to a reference to the one and only label. Delete the labels
- * that are no longer used. To increase performance, walk backwards
- * through the list.
- */
- for (J = LabelCount-1; J >= 1; --J) {
-
- /* Get the next label */
- CodeLabel* L = CE_GetLabel (E, J);
-
- /* Move all references from this label to the reference label */
- CL_MoveRefs (L, RefLab);
-
- /* Remove the label completely. */
- CS_DelLabel (S, L);
- }
-
- /* The reference label is the only remaining label. Check if there
- * are any references to this label, and delete it if this is not
- * the case.
- */
- if (CollCount (&RefLab->JumpFrom) == 0) {
- /* Delete the label */
- CS_DelLabel (S, RefLab);
- }
+ CodeLabel* RefLab;
+ unsigned J;
+
+ /* Get a pointer to the next entry */
+ CodeEntry* E = CS_GetEntry (S, I);
+
+ /* If this entry has zero labels, continue with the next one */
+ unsigned LabelCount = CE_GetLabelCount (E);
+ if (LabelCount == 0) {
+ continue;
+ }
+
+ /* We have at least one label. Use the first one as reference label. */
+ RefLab = CE_GetLabel (E, 0);
+
+ /* Walk through the remaining labels and change references to these
+ * labels to a reference to the one and only label. Delete the labels
+ * that are no longer used. To increase performance, walk backwards
+ * through the list.
+ */
+ for (J = LabelCount-1; J >= 1; --J) {
+
+ /* Get the next label */
+ CodeLabel* L = CE_GetLabel (E, J);
+
+ /* Move all references from this label to the reference label */
+ CL_MoveRefs (L, RefLab);
+
+ /* Remove the label completely. */
+ CS_DelLabel (S, L);
+ }
+
+ /* The reference label is the only remaining label. Check if there
+ * are any references to this label, and delete it if this is not
+ * the case.
+ */
+ if (CollCount (&RefLab->JumpFrom) == 0) {
+ /* Delete the label */
+ CS_DelLabel (S, RefLab);
+ }
}
}
/* Does the new entry have itself a label? */
if (CE_HasLabel (New)) {
- /* The new entry does already have a label - move references */
- CodeLabel* NewLabel = CE_GetLabel (New, 0);
- while (OldLabelCount--) {
+ /* The new entry does already have a label - move references */
+ CodeLabel* NewLabel = CE_GetLabel (New, 0);
+ while (OldLabelCount--) {
- /* Get the next label */
- CodeLabel* OldLabel = CE_GetLabel (Old, OldLabelCount);
+ /* Get the next label */
+ CodeLabel* OldLabel = CE_GetLabel (Old, OldLabelCount);
- /* Move references */
- CL_MoveRefs (OldLabel, NewLabel);
+ /* Move references */
+ CL_MoveRefs (OldLabel, NewLabel);
- /* Delete the label */
- CS_DelLabel (S, OldLabel);
+ /* Delete the label */
+ CS_DelLabel (S, OldLabel);
- }
+ }
} else {
- /* The new entry does not have a label, just move them */
- while (OldLabelCount--) {
+ /* The new entry does not have a label, just move them */
+ while (OldLabelCount--) {
- /* Move the label to the new entry */
- CE_MoveLabel (CE_GetLabel (Old, OldLabelCount), New);
+ /* Move the label to the new entry */
+ CE_MoveLabel (CE_GetLabel (Old, OldLabelCount), New);
- }
+ }
}
}
/* If there are no more references, delete the label */
if (CollCount (&L->JumpFrom) == 0) {
- CS_DelLabel (S, L);
+ CS_DelLabel (S, L);
}
}
/* There is an entry after Last - move the labels */
CS_MoveLabels (S, FirstEntry, FollowingEntry);
} else {
- /* Move the labels to the pool and clear the owner pointer */
- CS_MoveLabelsToPool (S, FirstEntry);
+ /* Move the labels to the pool and clear the owner pointer */
+ CS_MoveLabelsToPool (S, FirstEntry);
}
}
*/
for (I = Last; I >= First; --I) {
- /* Get the next entry */
- CodeEntry* E = CS_GetEntry (S, I);
+ /* Get the next entry */
+ CodeEntry* E = CS_GetEntry (S, I);
- /* Check if this entry has a label reference */
- if (E->JumpTo) {
+ /* Check if this entry has a label reference */
+ if (E->JumpTo) {
- /* If the label is a label in the label pool, this is an error */
- CodeLabel* L = E->JumpTo;
- CHECK (CollIndex (&S->Labels, L) < 0);
+ /* If the label is a label in the label pool, this is an error */
+ CodeLabel* L = E->JumpTo;
+ CHECK (CollIndex (&S->Labels, L) < 0);
- /* Remove the reference to the label */
- CS_RemoveLabelRef (S, E);
- }
+ /* Remove the reference to the label */
+ CS_RemoveLabelRef (S, E);
+ }
}
/* Second pass: Delete the instructions. If a label attached to an
*/
for (I = Last; I >= First; --I) {
- /* Get the next entry */
- CodeEntry* E = CS_GetEntry (S, I);
+ /* Get the next entry */
+ CodeEntry* E = CS_GetEntry (S, I);
- /* Check if this entry has a label attached */
- CHECK (!CE_HasLabel (E));
+ /* Check if this entry has a label attached */
+ CHECK (!CE_HasLabel (E));
- /* Delete the pointer to the entry */
- CollDelete (&S->Entries, I);
+ /* Delete the pointer to the entry */
+ CollDelete (&S->Entries, I);
- /* Delete the entry itself */
- FreeCodeEntry (E);
+ /* Delete the entry itself */
+ FreeCodeEntry (E);
}
}
unsigned C = Count;
while (Last < C--) {
- /* Get the next entry */
- CodeEntry* E = CS_GetEntry (S, C);
-
- /* Check if this entry has a label reference */
- if (E->JumpTo) {
- /* If the label is a label in the label pool and this is the last
- * reference to the label, remove the label from the pool.
- */
- CodeLabel* L = E->JumpTo;
- int Index = CollIndex (&S->Labels, L);
- if (Index >= 0 && CollCount (&L->JumpFrom) == 1) {
- /* Delete it from the pool */
- CollDelete (&S->Labels, Index);
- }
-
- /* Remove the reference to the label */
- CS_RemoveLabelRef (S, E);
- }
+ /* Get the next entry */
+ CodeEntry* E = CS_GetEntry (S, C);
+
+ /* Check if this entry has a label reference */
+ if (E->JumpTo) {
+ /* If the label is a label in the label pool and this is the last
+ * reference to the label, remove the label from the pool.
+ */
+ CodeLabel* L = E->JumpTo;
+ int Index = CollIndex (&S->Labels, L);
+ if (Index >= 0 && CollCount (&L->JumpFrom) == 1) {
+ /* Delete it from the pool */
+ CollDelete (&S->Labels, Index);
+ }
+
+ /* Remove the reference to the label */
+ CS_RemoveLabelRef (S, E);
+ }
}
C = Count;
while (Last < C--) {
- /* Get the next entry */
- CodeEntry* E = CS_GetEntry (S, C);
+ /* Get the next entry */
+ CodeEntry* E = CS_GetEntry (S, C);
- /* Check if this entry has a label attached */
- if (CE_HasLabel (E)) {
- /* Move the labels to the pool and clear the owner pointer */
- CS_MoveLabelsToPool (S, E);
- }
+ /* Check if this entry has a label attached */
+ if (CE_HasLabel (E)) {
+ /* Move the labels to the pool and clear the owner pointer */
+ CS_MoveLabelsToPool (S, E);
+ }
- /* Delete the pointer to the entry */
- CollDelete (&S->Entries, C);
+ /* Delete the pointer to the entry */
+ CollDelete (&S->Entries, C);
- /* Delete the entry itself */
- FreeCodeEntry (E);
+ /* Delete the entry itself */
+ FreeCodeEntry (E);
}
}
*/
if (Func) {
/* Get the function descriptor */
- CS_PrintFunctionHeader (S);
+ CS_PrintFunctionHeader (S);
WriteOutput (".segment\t\"%s\"\n\n.proc\t_%s", S->SegName, Func->Name);
if (IsQualNear (Func->Type)) {
WriteOutput (": near");
*/
{
if (S->Func) {
- WriteOutput ("\n.endproc\n\n");
+ WriteOutput ("\n.endproc\n\n");
}
}
/* If the code segment is empty, bail out here */
if (Count == 0) {
- return;
+ return;
}
/* Generate register info */
/* Output all entries, prepended by the line information if it has changed */
LI = 0;
for (I = 0; I < Count; ++I) {
- /* Get the next entry */
- const CodeEntry* E = CollConstAt (&S->Entries, I);
- /* Check if the line info has changed. If so, output the source line
- * if the option is enabled and output debug line info if the debug
- * option is enabled.
- */
- if (E->LI != LI) {
- /* Line info has changed, remember the new line info */
- LI = E->LI;
-
- /* Add the source line as a comment. Beware: When line continuation
+ /* Get the next entry */
+ const CodeEntry* E = CollConstAt (&S->Entries, I);
+ /* Check if the line info has changed. If so, output the source line
+ * if the option is enabled and output debug line info if the debug
+ * option is enabled.
+ */
+ if (E->LI != LI) {
+ /* Line info has changed, remember the new line info */
+ LI = E->LI;
+
+ /* Add the source line as a comment. Beware: When line continuation
* was used, the line may contain newlines.
*/
- if (AddSource) {
+ if (AddSource) {
const char* L = LI->Line;
WriteOutput (";\n; ");
while (*L) {
}
}
WriteOutput (";\n");
- }
-
- /* Add line debug info */
- if (DebugInfo) {
- WriteOutput ("\t.dbg\tline, \"%s\", %u\n",
- GetInputName (LI), GetInputLine (LI));
- }
- }
- /* Output the code */
- CE_Output (E);
+ }
+
+ /* Add line debug info */
+ if (DebugInfo) {
+ WriteOutput ("\t.dbg\tline, \"%s\", %u\n",
+ GetInputName (LI), GetInputLine (LI));
+ }
+ }
+ /* Output the code */
+ CE_Output (E);
}
/* If debug info is enabled, terminate the last line number information */
if (DebugInfo) {
- WriteOutput ("\t.dbg\tline\n");
+ WriteOutput ("\t.dbg\tline\n");
}
/* Free register info */
/* Generate register infos for all instructions */
{
unsigned I;
- RegContents Regs; /* Initial register contents */
+ RegContents Regs; /* Initial register contents */
RegContents* CurrentRegs; /* Current register contents */
int WasJump; /* True if last insn was a jump */
int Done; /* All runs done flag */
/* We may need two runs to get back references right */
do {
- /* Assume we're done after this run */
- Done = 1;
-
- /* On entry, the register contents are unknown */
- RC_Invalidate (&Regs);
- CurrentRegs = &Regs;
-
- /* Walk over all insns and note just the changes from one insn to the
- * next one.
- */
- WasJump = 0;
- for (I = 0; I < CS_GetEntryCount (S); ++I) {
-
- CodeEntry* P;
-
- /* Get the next instruction */
- CodeEntry* E = CollAtUnchecked (&S->Entries, I);
-
- /* If the instruction has a label, we need some special handling */
- unsigned LabelCount = CE_GetLabelCount (E);
- if (LabelCount > 0) {
-
- /* Loop over all entry points that jump here. If these entry
- * points already have register info, check if all values are
- * known and identical. If all values are identical, and the
- * preceeding instruction was not an unconditional branch, check
- * if the register value on exit of the preceeding instruction
- * is also identical. If all these values are identical, the
- * value of a register is known, otherwise it is unknown.
- */
- CodeLabel* Label = CE_GetLabel (E, 0);
- unsigned Entry;
- if (WasJump) {
- /* Preceeding insn was an unconditional branch */
- CodeEntry* J = CL_GetRef(Label, 0);
- if (J->RI) {
- Regs = J->RI->Out2;
- } else {
- RC_Invalidate (&Regs);
- }
- Entry = 1;
- } else {
- Regs = *CurrentRegs;
- Entry = 0;
- }
-
- while (Entry < CL_GetRefCount (Label)) {
- /* Get this entry */
- CodeEntry* J = CL_GetRef (Label, Entry);
- if (J->RI == 0) {
- /* No register info for this entry. This means that the
- * instruction that jumps here is at higher addresses and
- * the jump is a backward jump. We need a second run to
- * get the register info right in this case. Until then,
- * assume unknown register contents.
- */
- Done = 0;
- RC_Invalidate (&Regs);
- break;
- }
- if (J->RI->Out2.RegA != Regs.RegA) {
- Regs.RegA = UNKNOWN_REGVAL;
- }
- if (J->RI->Out2.RegX != Regs.RegX) {
- Regs.RegX = UNKNOWN_REGVAL;
- }
- if (J->RI->Out2.RegY != Regs.RegY) {
- Regs.RegY = UNKNOWN_REGVAL;
- }
- if (J->RI->Out2.SRegLo != Regs.SRegLo) {
- Regs.SRegLo = UNKNOWN_REGVAL;
- }
- if (J->RI->Out2.SRegHi != Regs.SRegHi) {
- Regs.SRegHi = UNKNOWN_REGVAL;
- }
- if (J->RI->Out2.Tmp1 != Regs.Tmp1) {
- Regs.Tmp1 = UNKNOWN_REGVAL;
- }
- ++Entry;
- }
-
- /* Use this register info */
- CurrentRegs = &Regs;
-
- }
-
- /* Generate register info for this instruction */
- CE_GenRegInfo (E, CurrentRegs);
-
- /* Remember for the next insn if this insn was an uncondition branch */
- WasJump = (E->Info & OF_UBRA) != 0;
-
- /* Output registers for this insn are input for the next */
- CurrentRegs = &E->RI->Out;
-
- /* If this insn is a branch on zero flag, we may have more info on
- * register contents for one of both flow directions, but only if
- * there is a previous instruction.
- */
- if ((E->Info & OF_ZBRA) != 0 && (P = CS_GetPrevEntry (S, I)) != 0) {
-
- /* Get the branch condition */
- bc_t BC = GetBranchCond (E->OPC);
-
- /* Check the previous instruction */
- switch (P->OPC) {
-
- case OP65_ADC:
- case OP65_AND:
- case OP65_DEA:
- case OP65_EOR:
- case OP65_INA:
- case OP65_LDA:
- case OP65_ORA:
- case OP65_PLA:
- case OP65_SBC:
- /* A is zero in one execution flow direction */
- if (BC == BC_EQ) {
- E->RI->Out2.RegA = 0;
- } else {
- E->RI->Out.RegA = 0;
- }
- break;
-
- case OP65_CMP:
- /* If this is an immidiate compare, the A register has
- * the value of the compare later.
- */
- if (CE_IsConstImm (P)) {
- if (BC == BC_EQ) {
- E->RI->Out2.RegA = (unsigned char)P->Num;
- } else {
- E->RI->Out.RegA = (unsigned char)P->Num;
- }
- }
- break;
-
- case OP65_CPX:
- /* If this is an immidiate compare, the X register has
- * the value of the compare later.
- */
- if (CE_IsConstImm (P)) {
- if (BC == BC_EQ) {
- E->RI->Out2.RegX = (unsigned char)P->Num;
- } else {
- E->RI->Out.RegX = (unsigned char)P->Num;
- }
- }
- break;
-
- case OP65_CPY:
- /* If this is an immidiate compare, the Y register has
- * the value of the compare later.
- */
- if (CE_IsConstImm (P)) {
- if (BC == BC_EQ) {
- E->RI->Out2.RegY = (unsigned char)P->Num;
- } else {
- E->RI->Out.RegY = (unsigned char)P->Num;
- }
- }
- break;
-
- case OP65_DEX:
- case OP65_INX:
- case OP65_LDX:
- case OP65_PLX:
- /* X is zero in one execution flow direction */
- if (BC == BC_EQ) {
- E->RI->Out2.RegX = 0;
- } else {
- E->RI->Out.RegX = 0;
- }
- break;
-
- case OP65_DEY:
- case OP65_INY:
- case OP65_LDY:
- case OP65_PLY:
- /* X is zero in one execution flow direction */
- if (BC == BC_EQ) {
- E->RI->Out2.RegY = 0;
- } else {
- E->RI->Out.RegY = 0;
- }
- break;
-
- case OP65_TAX:
- case OP65_TXA:
- /* If the branch is a beq, both A and X are zero at the
- * branch target, otherwise they are zero at the next
- * insn.
- */
- if (BC == BC_EQ) {
- E->RI->Out2.RegA = E->RI->Out2.RegX = 0;
- } else {
- E->RI->Out.RegA = E->RI->Out.RegX = 0;
- }
- break;
-
- case OP65_TAY:
- case OP65_TYA:
- /* If the branch is a beq, both A and Y are zero at the
- * branch target, otherwise they are zero at the next
- * insn.
- */
- if (BC == BC_EQ) {
- E->RI->Out2.RegA = E->RI->Out2.RegY = 0;
- } else {
- E->RI->Out.RegA = E->RI->Out.RegY = 0;
- }
- break;
-
- default:
- break;
-
- }
- }
- }
+ /* Assume we're done after this run */
+ Done = 1;
+
+ /* On entry, the register contents are unknown */
+ RC_Invalidate (&Regs);
+ CurrentRegs = &Regs;
+
+ /* Walk over all insns and note just the changes from one insn to the
+ * next one.
+ */
+ WasJump = 0;
+ for (I = 0; I < CS_GetEntryCount (S); ++I) {
+
+ CodeEntry* P;
+
+ /* Get the next instruction */
+ CodeEntry* E = CollAtUnchecked (&S->Entries, I);
+
+ /* If the instruction has a label, we need some special handling */
+ unsigned LabelCount = CE_GetLabelCount (E);
+ if (LabelCount > 0) {
+
+ /* Loop over all entry points that jump here. If these entry
+ * points already have register info, check if all values are
+ * known and identical. If all values are identical, and the
+ * preceeding instruction was not an unconditional branch, check
+ * if the register value on exit of the preceeding instruction
+ * is also identical. If all these values are identical, the
+ * value of a register is known, otherwise it is unknown.
+ */
+ CodeLabel* Label = CE_GetLabel (E, 0);
+ unsigned Entry;
+ if (WasJump) {
+ /* Preceeding insn was an unconditional branch */
+ CodeEntry* J = CL_GetRef(Label, 0);
+ if (J->RI) {
+ Regs = J->RI->Out2;
+ } else {
+ RC_Invalidate (&Regs);
+ }
+ Entry = 1;
+ } else {
+ Regs = *CurrentRegs;
+ Entry = 0;
+ }
+
+ while (Entry < CL_GetRefCount (Label)) {
+ /* Get this entry */
+ CodeEntry* J = CL_GetRef (Label, Entry);
+ if (J->RI == 0) {
+ /* No register info for this entry. This means that the
+ * instruction that jumps here is at higher addresses and
+ * the jump is a backward jump. We need a second run to
+ * get the register info right in this case. Until then,
+ * assume unknown register contents.
+ */
+ Done = 0;
+ RC_Invalidate (&Regs);
+ break;
+ }
+ if (J->RI->Out2.RegA != Regs.RegA) {
+ Regs.RegA = UNKNOWN_REGVAL;
+ }
+ if (J->RI->Out2.RegX != Regs.RegX) {
+ Regs.RegX = UNKNOWN_REGVAL;
+ }
+ if (J->RI->Out2.RegY != Regs.RegY) {
+ Regs.RegY = UNKNOWN_REGVAL;
+ }
+ if (J->RI->Out2.SRegLo != Regs.SRegLo) {
+ Regs.SRegLo = UNKNOWN_REGVAL;
+ }
+ if (J->RI->Out2.SRegHi != Regs.SRegHi) {
+ Regs.SRegHi = UNKNOWN_REGVAL;
+ }
+ if (J->RI->Out2.Tmp1 != Regs.Tmp1) {
+ Regs.Tmp1 = UNKNOWN_REGVAL;
+ }
+ ++Entry;
+ }
+
+ /* Use this register info */
+ CurrentRegs = &Regs;
+
+ }
+
+ /* Generate register info for this instruction */
+ CE_GenRegInfo (E, CurrentRegs);
+
+ /* Remember for the next insn if this insn was an uncondition branch */
+ WasJump = (E->Info & OF_UBRA) != 0;
+
+ /* Output registers for this insn are input for the next */
+ CurrentRegs = &E->RI->Out;
+
+ /* If this insn is a branch on zero flag, we may have more info on
+ * register contents for one of both flow directions, but only if
+ * there is a previous instruction.
+ */
+ if ((E->Info & OF_ZBRA) != 0 && (P = CS_GetPrevEntry (S, I)) != 0) {
+
+ /* Get the branch condition */
+ bc_t BC = GetBranchCond (E->OPC);
+
+ /* Check the previous instruction */
+ switch (P->OPC) {
+
+ case OP65_ADC:
+ case OP65_AND:
+ case OP65_DEA:
+ case OP65_EOR:
+ case OP65_INA:
+ case OP65_LDA:
+ case OP65_ORA:
+ case OP65_PLA:
+ case OP65_SBC:
+ /* A is zero in one execution flow direction */
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegA = 0;
+ } else {
+ E->RI->Out.RegA = 0;
+ }
+ break;
+
+ case OP65_CMP:
+ /* If this is an immidiate compare, the A register has
+ * the value of the compare later.
+ */
+ if (CE_IsConstImm (P)) {
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegA = (unsigned char)P->Num;
+ } else {
+ E->RI->Out.RegA = (unsigned char)P->Num;
+ }
+ }
+ break;
+
+ case OP65_CPX:
+ /* If this is an immidiate compare, the X register has
+ * the value of the compare later.
+ */
+ if (CE_IsConstImm (P)) {
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegX = (unsigned char)P->Num;
+ } else {
+ E->RI->Out.RegX = (unsigned char)P->Num;
+ }
+ }
+ break;
+
+ case OP65_CPY:
+ /* If this is an immidiate compare, the Y register has
+ * the value of the compare later.
+ */
+ if (CE_IsConstImm (P)) {
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegY = (unsigned char)P->Num;
+ } else {
+ E->RI->Out.RegY = (unsigned char)P->Num;
+ }
+ }
+ break;
+
+ case OP65_DEX:
+ case OP65_INX:
+ case OP65_LDX:
+ case OP65_PLX:
+ /* X is zero in one execution flow direction */
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegX = 0;
+ } else {
+ E->RI->Out.RegX = 0;
+ }
+ break;
+
+ case OP65_DEY:
+ case OP65_INY:
+ case OP65_LDY:
+ case OP65_PLY:
+ /* X is zero in one execution flow direction */
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegY = 0;
+ } else {
+ E->RI->Out.RegY = 0;
+ }
+ break;
+
+ case OP65_TAX:
+ case OP65_TXA:
+ /* If the branch is a beq, both A and X are zero at the
+ * branch target, otherwise they are zero at the next
+ * insn.
+ */
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegA = E->RI->Out2.RegX = 0;
+ } else {
+ E->RI->Out.RegA = E->RI->Out.RegX = 0;
+ }
+ break;
+
+ case OP65_TAY:
+ case OP65_TYA:
+ /* If the branch is a beq, both A and Y are zero at the
+ * branch target, otherwise they are zero at the next
+ * insn.
+ */
+ if (BC == BC_EQ) {
+ E->RI->Out2.RegA = E->RI->Out2.RegY = 0;
+ } else {
+ E->RI->Out.RegA = E->RI->Out.RegY = 0;
+ }
+ break;
+
+ default:
+ break;
+
+ }
+ }
+ }
} while (!Done);
}
projects / cc65 / blobdiff