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Add anonymous labels

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Fix #497
This commit is contained in:
ISSOtm
2020-12-12 11:52:06 +01:00
committed by Eldred Habert
parent 0e40543757
commit 8f2a894b88
12 changed files with 151 additions and 8 deletions
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50
src/asm/symbol.c
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@@ -515,11 +515,60 @@ struct Symbol *sym_AddLabel(char const *name)
return sym;
}
static uint32_t anonLabelID;
/*
* Add an anonymous label
*/
struct Symbol *sym_AddAnonLabel(void)
{
if (anonLabelID == UINT32_MAX) {
error("Only %" PRIu32 " anonymous labels can be created!");
return NULL;
}
char name[MAXSYMLEN + 1];
sym_WriteAnonLabelName(name, 0, true); // The direction is important!!
anonLabelID++;
return addLabel(name);
}
/*
* Write an anonymous label's name to a buffer
*/
void sym_WriteAnonLabelName(char buf[static MAXSYMLEN + 1], uint32_t ofs, bool neg)
{
uint32_t id = 0;
if (neg) {
if (ofs > anonLabelID)
error("Reference to anonymous label %" PRIu32 " before, when only %" PRIu32
" ha%s been created so far\n",
ofs, anonLabelID, anonLabelID == 1 ? "s" : "ve");
else
id = anonLabelID - ofs;
} else {
ofs--; // We're referencing symbols that haven't been created yet...
if (ofs > UINT32_MAX - anonLabelID)
error("Reference to anonymous label %" PRIu32 " after, when only %" PRIu32
" may still be created\n", ofs + 1, UINT32_MAX - anonLabelID);
else
id = anonLabelID + ofs;
}
sprintf(buf, "!%u", id);
}
/*
* Export a symbol
*/
void sym_Export(char const *symName)
{
if (symName[0] == '!') {
error("Anonymous labels cannot be exported\n");
return;
}
struct Symbol *sym = sym_FindScopedSymbol(symName);
/* If the symbol doesn't exist, create a ref that can be purged */
@@ -671,6 +720,7 @@ void sym_Init(void)
#undef addString
labelScope = NULL;
anonLabelID = 0;
math_DefinePI();
}