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CU Amiga Super CD-ROM 17
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CU Amiga Magazine's Super CD-ROM 17 (1997)(EMAP Images)(GB)[!][issue 1997-12].iso
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CUCD
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Programming
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DiceSource
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src
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dc1
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stmt.cold
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1994-02-06
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20KB
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895 lines
/*
* STMT.C
*
* Parse procedural junk: declarations, statements, etc...
*/
#include "defs.h"
Prototype short CompProcedureArgDeclarators(short, Var ***, long *, long *);
Prototype short CompProcedure(short, Var *);
Prototype short CompStmtDeclExp(short, Stmt **, long);
Prototype short CompBlock(short, Stmt **);
Prototype short CompFor(short, Stmt **);
Prototype short CompWhile(short, Stmt **);
Prototype short CompDo(short, Stmt **);
Prototype short CompIf(short, Stmt **);
Prototype short CompSwitch(short, Stmt **);
Prototype short CompBreak(short, Stmt **);
Prototype short CompContinue(short, Stmt **);
Prototype short CompGoto(short, Stmt **);
Prototype short CompLabel(short, Stmt **);
Prototype short CompReturn(short, Stmt **);
Prototype short CompBreakPoint(short, Stmt **);
/*
* Deals with argument declarations to a procedure. Does NOT compile
* the procedure itself.
*
* Determines registerization, if any, for both externs and procedure
* definitions.
*
* void foo ( {START} a, b, c, d ) <more>
* void foo ( {START} short, short) <more>
* void foo ( {START} short a, short b) <more>
*
* more = old style declarators (which I like much better than proto style anyway),
* optional .. could be ';' if just a prototype. If a procedure
* definition then returns TokSemi.
*/
short
CompProcedureArgDeclarators(short t, Var ***pvars, long *pargs, long *pflags)
{
Var **vars = NULL;
short i;
short n = -1;
short siz = 0;
short oldState = State;
State = SARG;
*pargs = 0;
*pvars = NULL;
*pflags = 0;
if (t == TokDotDotDot) {
*pflags |= TF_DOTDOTDOT | TF_PROTOTYPE;
t = GetToken();
if (t != TokRParen)
zerror(EERROR_SYNTAX_ERROR_DECL);
n = 0;
}
while (t != TokRParen) {
Type *baseType;
Type *type;
Var *var;
Symbol *sym = NULL;
long baseFlags;
long regFlags;
if (n < 0)
n = 0;
/*
* If not an ID we assume it is a type declaration and thus this
* is a prototype.
*/
if (t != TokId && t != TokVarId && t != TokEnumConst)
*pflags |= TF_PROTOTYPE;
t = CompType(t, &baseType, &baseFlags, ®Flags); /* defaults to int if none */
type = baseType;
t = CompTypeDeclarators(t, &type, &sym, baseFlags);
if (regFlags & RF_REGISTER)
*pflags |= TF_REGCALL;
if (type == &VoidType) {
if (n)
zerror(EERROR_SYNTAX_ERROR_DECL);
if (t != TokRParen)
zerror(EERROR_SYNTAX_ERROR_DECL);
break;
}
if (n == siz) {
siz += 4;
vars = zrealloc(vars, sizeof(Var *), n, siz);
}
/*
* argument
*/
var = AllocStructure(Var);
var->Type = type;
var->Sym = sym;
var->Flags = (baseFlags & TF_STORQUALMASK) | type->Flags | (VF_ARG | TF_AUTO);
var->RegFlags = regFlags;
if (type->Id != TID_INT && type->Id != TID_PTR && type->Id != TID_ARY)
*pflags |= TF_STKCALL;
if (baseFlags & (TF_STATIC|TF_EXTERN))
zerror(EERROR_ILLEGAL_QUALIFIER);
/*
* Bump the refs for the 'register' keyword to give the variable
* a better chance of being put in a register.
*/
if (var->Flags & TF_REGISTER)
++var->Refs;
vars[n++] = var;
if (t != TokRParen && t != TokComma) {
zerror(EERROR_SYNTAX_ERROR_DECL);
goto bad;
}
if (t == TokComma) {
t = GetToken();
if (t == TokDotDotDot) {
*pflags |= TF_DOTDOTDOT;
t = GetToken();
if (t != TokRParen)
zerror(EERROR_SYNTAX_ERROR_DECL);
}
}
}
*pargs = n;
*pvars = vars;
/*
* have right paren, now is this a real procedure or just a declaration
* of some sort?
*/
t = GetToken();
if (t == TokComma || t == TokEq || t == TokSemi || t == TokRParen) {
if (!(*pflags & TF_PROTOTYPE))
*pflags |= TF_STKCALL;
goto skip;
}
/*
* Else a real procedure.. handle old-style argument decls. We return
* when we get a '{'. Also make sure all the variables are named.
*/
for (i = 0; i < n; ++i) {
Var *var = vars[i];
if (var->Sym == NULL) {
zerror(EERROR_ID_MISSING_PROC);
var->Sym = MakeSymbol("____dummy", 9, TokId, 0);
/* goto bad; */
/* break; */
}
}
while (t != TokLBrace) {
Type *baseType;
Type *type;
Var *var;
Symbol *sym = NULL; /* XXX needed? */
long baseFlags;
long regFlags;
long li = LFBase->lf_Index;
t = CompType(t, &baseType, &baseFlags, ®Flags); /* defaults to int if none */
for (;;) {
type = baseType;
t = CompTypeDeclarators(t, &type, &sym, baseFlags);
for (i = 0; i < n; ++i) {
var = vars[i];
if (var->Sym == sym)
break;
}
if (i == n) {
zerror(EERROR_ID_NOT_IN_LIST);
} else {
var->Type = type;
var->Flags = (baseFlags & TF_STORQUALMASK) | type->Flags | (VF_ARG | TF_AUTO);
var->RegFlags = regFlags;
if (var->Flags & TF_REGISTER)
++var->Refs;
if (regFlags & RF_REGISTER)
*pflags |= TF_REGCALL;
}
if (type->Id != TID_INT && type->Id != TID_PTR && type->Id != TID_ARY)
*pflags |= TF_STKCALL;
if (t == TokComma) {
t = GetToken();
continue;
}
break;
}
if (t != TokSemi) {
zerror(EERROR_EXPECTED_SEMICOLON);
if (li == LFBase->lf_Index) /* prevent inifinite loop */
t = GetToken();
break;
}
t = GetToken();
}
skip:
/*
* If explicitly registerized then clear TF_STKCALL bit (which gets
* set when automatic registerization is not possible)
*/
if (*pflags & TF_REGCALL)
*pflags &= ~TF_STKCALL;
bad:
State = oldState;
return(t);
}
/*
* Compiles a procedure, t had better be TokLBrace.
*
* returns TokSemi to simply toplevel.c
*
* Normally assigns in decls work as follows: the variable is added to the
* current block's variable list and the decl-stmt is added to the current
* block's statement list (which retains placement).
*/
short
CompProcedure(short t, Var *var)
{
Stmt *stmt;
short oldState = State;
long lexIdx = LFBase->lf_Index;
if (t != TokLBrace)
zerror(EERROR_EXPECTED_OCBRACE_PROC);
State = SARG; /* first properly add args */
var->u.Block = BlockDown(BT_PROC);
{
short i;
Type *type = var->Type;
for (i = 0; i < type->Args; ++i) {
Var *xvar = type->Vars[i];
BlockAddVar(xvar);
Assert(xvar->Sym);
SemanticAdd(xvar->Sym, TokVarId, xvar);
}
}
State = SINSIDE;
t = CompBlock(GetToken(), &stmt);
BlockAddStmt(stmt);
State = SARG;
BlockUp();
State = SOUTSIDE;
/*
* t should be TokRBrace.. return TokSemi instead
*/
if (t != TokRBrace)
yerror(lexIdx, EERROR_EXPECTED_OCBRACE_PROC);
State = oldState;
return(TokSemi);
}
short
CompStmtDeclExp(short t, Stmt **pstmt, long semiexp)
{
*pstmt = NULL;
switch(t) {
case TokLBrace:
t = CompBlock(GetToken(), pstmt);
t = GetToken();
break;
case TokBreak:
t = CompBreak(GetToken(), pstmt);
break;
case TokCase:
zerror(EERROR_CASE_DEFAULT_OUTSIDE);
t = GetToken();
break;
case TokContinue:
t = CompContinue(GetToken(), pstmt);
break;
case TokDefault:
zerror(EERROR_CASE_DEFAULT_OUTSIDE);
t = GetToken();
break;
case TokDo:
BlockCost += 2;
t = CompDo(GetToken(), pstmt);
BlockCost -= 2;
break;
case TokElse:
zerror(EERROR_ELSE_NO_IF);
t = GetToken();
break;
case TokFor:
BlockCost += 2;
t = CompFor(GetToken(), pstmt);
BlockCost -= 2;
break;
case TokGoto:
t = CompGoto(GetToken(), pstmt);
break;
case TokIf:
t = CompIf(GetToken(), pstmt);
break;
case TokReturn:
t = CompReturn(GetToken(), pstmt);
break;
case TokSwitch:
t = CompSwitch(GetToken(), pstmt);
break;
case TokWhile:
BlockCost += 2;
t = CompWhile(GetToken(), pstmt);
BlockCost -= 2;
break;
case TokBreakPoint:
t = CompBreakPoint(GetToken(), pstmt);
break;
case TokSemi:
if (semiexp)
t = GetToken();
break;
/*
* declaration
*/
case TokStruct:
case TokEnum:
case TokUnion:
case TokTypeQual:
case TokTypeDef:
case TokTypeId:
case TokTypeof:
{
Var *var = NULL;
BlockStmt *block = NULL;
t = CompDecl(t, &var, semiexp);
/*
* add variables to the current block, any procedure decls
* will be moved to the top level. Returns base of list
* of newly added variables to the current block (minus any
* procdures added to the top)
*/
if (var)
var = BlockAddVar(var);
if (var && var->Next) /* more 'n one! */
block = BlockDown(BT_BLOCK);
while (var) { /* for each... */
if (var->Type->Id != TID_PROC && var->u.AssExp && (var->Flags & TF_AUTO)) {
ExpStmt *es = AllocTmpStructure(ExpStmt);
/*
if (var->u.AssExp->ex_Token == TokExpAssBlock)
cerror(ESOFT, "DICE cannot handle local braced assignments yet");
*/
es->st_Func = (void (*)(void *))GenExp;
es->st_Tok = TokExp;
es->st_LexIdx = LFBase->lf_Index;
InsertAssign(&var->u.AssExp, var);
es->Expr = var->u.AssExp;
++var->Refs;
if (block)
BlockAddStmt((Stmt *)es);
else
*pstmt = (Stmt *)es;
}
var = var->Next;
}
if (block) {
*pstmt = (Stmt *)block;
BlockUp();
}
}
break;
case TokLabelId:
Assert(0);
/* t = CompLabel(t, pstmt); */
break;
case TokId: /* label or subroutine call ? */
case TokVarId: /* label or variable ? */
if (LexHackColon) { /* label (lexical hack checks for a :) */
t = CompLabel(t, pstmt);
break;
}
/* fall through to exp */
default:
{
Exp *exp = NULL;
ExpStmt *es = AllocTmpStructure(ExpStmt);
long li = LFBase->lf_Index;
t = CompExp(t, &exp, 1);
if (semiexp) {
if (t == TokSemi) {
t = GetToken();
} else {
zerror(EWARN_EXPECTED_SEMICOLON);
if (LFBase->lf_Index = li) /* prevent endless loop */
t = GetToken();
}
}
if (exp == NULL)
zerror(EFATAL_SYNTAX_ERROR_EXP);
es->st_Func = (void (*)(void *))GenExp;
es->st_Tok = TokExp;
es->st_LexIdx = exp->ex_LexIdx;
es->Expr = exp;
*pstmt = (Stmt *)es;
}
break;
}
return(t);
}
/*
* CompBlock() works slightly differently in that it returns t = TokRBrace,
* allowing toplevel.c to simply throw away t (makes the code easier)
*
* All Comp*() for statements have access to their parent blocks... they
* need not set it (it's done automatically on return) UNLESS they make
* calls to other Comp*() statements.
*
* Attempt to set block->LastLexIdx for debug info synchronization to just
* before the close brace. This does not always work perfectly (but does
* not cause a screwup in those cases either).
*/
short
CompBlock(short t, Stmt **pstmt)
{
BlockStmt *block = BlockDown(BT_BLOCK);
*pstmt = (Stmt *)block;
while (t != TokRBrace) {
Stmt *stmt;
t = CompStmtDeclExp(t, &stmt, 1);
BlockAddStmt(stmt);
if (!t)
break;
}
BlockUp();
return(t);
}
/*
* for (stmt ; exp; stmt) stmt
*
* Note: The Block junk is to add another variable level allowing
* temporary declarations within the for.. for (int i = 0; ...)
*/
short
CompFor(short t, Stmt **pstmt)
{
ForStmt *stmt = AllocTmpStructure(ForStmt);
BlockStmt *block = BlockDown(BT_FOR);
*pstmt = (Stmt *)block;
stmt->Block = block;
block->LabelLoop = AllocLabel();
block->LabelTest = AllocLabel();
block->LabelBreak = AllocLabel();
BlockAddStmt((Stmt *)stmt);
stmt->st_Func = (void (*)(void *))GenFor;
stmt->st_Tok = TokFor;
stmt->st_LexIdx = LFBase->lf_Index;
stmt->LabelBegin = AllocLabel();
t = SkipToken(t, TokLParen);
if (t != TokSemi)
t = CompStmtDeclExp(t, &stmt->Stmt1, 0);
t = SkipToken(t, TokSemi);
if (t != TokSemi)
t = CompStmtDeclExp(t, &stmt->Stmt2, 0);
t = SkipToken(t, TokSemi);
if (t != TokRParen)
t = CompStmtDeclExp(t, &stmt->Stmt3, 0);
t = SkipToken(t, TokRParen);
t = CompStmtDeclExp(t, &stmt->Stmt4, 1);
if (stmt->Stmt2) {
if (stmt->Stmt2->st_Tok != TokExp)
zerror(EFATAL_STMT_COND_NOT_EXP);
InsertBranch(&((ExpStmt *)stmt->Stmt2)->Expr, COND_T, block->LabelLoop);
}
BlockUp();
return(t);
}
short
CompWhile(short t, Stmt **pstmt)
{
WhileStmt *stmt = AllocTmpStructure(WhileStmt);
BlockStmt *block = BlockDown(BT_WHILE);
*pstmt = (Stmt *)block;
stmt->Block = block;
block->LabelLoop = AllocLabel();
block->LabelTest = AllocLabel();
block->LabelBreak = AllocLabel();
BlockAddStmt((Stmt *)stmt);
stmt->st_Func = (void (*)(void *))GenWhile;
stmt->st_Tok = TokWhile;
stmt->st_LexIdx = LFBase->lf_Index;
t = SkipToken(t, TokLParen);
t = CompStmtDeclExp(t, &stmt->Stmt1, 0);
t = SkipToken(t, TokRParen);
t = CompStmtDeclExp(t, &stmt->Stmt2, 1);
if (stmt->Stmt1->st_Tok != TokExp)
zerror(EFATAL_STMT_COND_NOT_EXP);
InsertBranch(&((ExpStmt *)stmt->Stmt1)->Expr, COND_T, block->LabelLoop);
BlockUp();
return(t);
}
short
CompDo(short t, Stmt **pstmt)
{
DoStmt *stmt = AllocTmpStructure(DoStmt);
BlockStmt *block = BlockDown(BT_DO);
*pstmt = (Stmt *)block;
stmt->Block = block;
block->LabelLoop = AllocLabel();
block->LabelTest = AllocLabel();
block->LabelBreak = AllocLabel();
BlockAddStmt((Stmt *)stmt);
stmt->st_Func = (void (*)(void *))GenDo;
stmt->st_Tok = TokDo;
stmt->st_LexIdx = LFBase->lf_Index;
t = CompStmtDeclExp(t, &stmt->Stmt1, 1); /* code */
t = SkipToken(t, TokWhile);
t = CompStmtDeclExp(t, &stmt->Stmt2, 1); /* test */
if (stmt->Stmt2->st_Tok != TokExp)
zerror(EFATAL_STMT_COND_NOT_EXP);
InsertBranch(&((ExpStmt *)stmt->Stmt2)->Expr, COND_T, block->LabelLoop);
BlockUp();
return(t);
}
short
CompIf(short t, Stmt **pstmt)
{
IfStmt *stmt = AllocTmpStructure(IfStmt);
*pstmt = (Stmt *)stmt;
stmt->st_Func = (void (*)(void *))GenIf;
stmt->st_Tok = TokIf;
stmt->st_LexIdx = LFBase->lf_Index;
stmt->LabelIf = AllocLabel();
stmt->LabelElse = AllocLabel();
stmt->LabelEnd = AllocLabel();
t = SkipToken(t, TokLParen);
t = CompStmtDeclExp(t, &stmt->Stmt1, 0); /* cond */
t = SkipToken(t, TokRParen);
t = CompStmtDeclExp(t, &stmt->StmtT, 1); /* true */
if (t == TokElse)
t = CompStmtDeclExp(GetToken(), &stmt->StmtF, 1); /* false */
if (stmt->Stmt1->st_Tok != TokExp)
zerror(EFATAL_STMT_COND_NOT_EXP);
InsertBranch(&((ExpStmt *)stmt->Stmt1)->Expr, COND_F, stmt->LabelElse);
return(t);
}
/*
* switch (exp) { ... }
*
* Not only is exp in a semantic level, but each case/default is as well, so
* you can: case 1:
* int i = 4;
* ...
* case 2:
* int i = 5;
* ...
*
*/
short
CompSwitch(short t, Stmt **pstmt)
{
SwitchStmt *stmt = AllocTmpStructure(SwitchStmt);
BlockStmt *block = BlockDown(BT_SWITCH);
short siz = 0;
short haveCase = 0;
*pstmt = (Stmt *)block;
BlockAddStmt((Stmt *)stmt);
stmt->st_Func = (void (*)(void *))GenSwitch;
stmt->st_Tok = TokSwitch;
stmt->st_LexIdx = LFBase->lf_Index;
stmt->Block = block;
block->LabelLoop = AllocLabel();
block->LabelBreak = AllocLabel();
t = SkipToken(t, TokLParen);
t = CompStmtDeclExp(t, &stmt->Stmt1, 0); /* exp */
Assert(stmt->Stmt1->st_Tok == TokExp);
/* don't deallocate result! */
stmt->Stmt1->st_Func = (void (*)(void *))GenExpResult;
t = SkipToken(t, TokRParen);
t = SkipToken(t, TokLBrace);
/*
* now, each case and default is in its own block.
*/
while (t && t != TokRBrace) {
if (t == TokCase) {
Exp *exp;
if (siz == stmt->NumCases) {
if (siz >= 32)
siz *= 2;
else
siz += 4;
stmt->Cases = zrealloc(stmt->Cases, sizeof(stmt->Cases[0]), stmt->NumCases, siz);
stmt->Labels= zrealloc(stmt->Labels, sizeof(stmt->Labels[0]), stmt->NumCases, siz);
stmt->CaseAry = zrealloc(stmt->CaseAry, sizeof(stmt->CaseAry[0]), stmt->NumCases, siz);
}
if (haveCase)
BlockUp();
stmt->CaseAry[stmt->NumCases] = BlockDown(BT_BLOCK);
{
long l = AllocLabel();
stmt->CaseAry[stmt->NumCases]->LabelTest = l;
stmt->Labels[stmt->NumCases] = l;
}
t = CompExp(GetToken(), &exp, 1);
stmt->Cases[stmt->NumCases] = ExpToConstant(exp);
++stmt->NumCases;
t = SkipToken(t, TokColon);
haveCase = 1;
} else if (t == TokDefault) {
if (haveCase)
BlockUp();
if (stmt->DefBlock)
zerror(EERROR_DUPLICATE_DEFAULT);
stmt->DefBlock = BlockDown(BT_BLOCK);
stmt->DefBlock->LabelTest = AllocLabel();
stmt->DefCaseNo = stmt->NumCases; /* insert before... */
t = SkipToken(GetToken(), TokColon);
haveCase = 1;
} else {
Stmt *caseStmt;
t = CompStmtDeclExp(t, &caseStmt, 1);
BlockAddStmt(caseStmt);
if (haveCase == 0 && caseStmt) {
if (caseStmt->Hdr.Tok != TokBlock || ((BlockStmt *)caseStmt)->Base)
zerror(EERROR_STATEMENTS_BEFORE_CASE);
}
}
}
if (haveCase)
BlockUp();
t = GetToken();
BlockUp();
return(t);
}
/*
* break;
*/
short
CompBreak(short t, Stmt **pstmt)
{
BreakStmt *stmt = AllocTmpStructure(BreakStmt);
t = SkipToken(t, TokSemi);
*pstmt = (Stmt *)stmt;
stmt->st_Func = (void (*)(void *))GenBreak;
stmt->st_Tok = TokBreak;
stmt->st_LexIdx = LFBase->lf_Index;
if ((stmt->BreakLabel = FindBreakLabel()) == 0)
zerror(EERROR_BREAK_OUTSIDE_LOOPSW);
return(t);
}
short
CompContinue(short t, Stmt **pstmt)
{
ContinueStmt *stmt = AllocTmpStructure(ContinueStmt);
t = SkipToken(t, TokSemi);
*pstmt = (Stmt *)stmt;
stmt->st_Func = (void (*)(void *))GenContinue;
stmt->st_Tok = TokContinue;
stmt->st_LexIdx = LFBase->lf_Index;
if ((stmt->ContLabel = FindContinueLabel()) == 0)
zerror(EERROR_CONT_OUTSIDE_LOOP);
return(t);
}
/*
* goto label;
*/
short
CompGoto(short t, Stmt **pstmt)
{
GotoStmt *stmt = AllocTmpStructure(GotoStmt);
SemInfo *sem;
long label;
*pstmt = (Stmt *)stmt;
stmt->st_Func = (void (*)(void *))GenGoto;
stmt->st_Tok = TokGoto;
stmt->st_LexIdx = LFBase->lf_Index;
switch(t) {
case TokId:
case TokVarId:
case TokEnumConst:
if ((sem = FindSymbolId(LexSym, TokLabelId)) == NULL) {
label = AllocLabel();
SemanticAddTopBlock(LexSym, TokLabelId, (void *)label);
break;
}
label = (long)sem->Data;
break;
case TokLabelId:
Assert(0);
/* label = (long)LexData; */
break;
default:
zerror(EERROR_SYNTAX_ERROR_EXP);
break;
}
stmt->GotoLabel = label;
t = GetToken();
t = SkipToken(t, TokSemi);
return(t);
}
short
CompLabel(short t, Stmt **pstmt)
{
LabelStmt *stmt = AllocTmpStructure(LabelStmt);
SemInfo *sem;
long label;
*pstmt = (Stmt *)stmt;
stmt->st_Func = (void (*)(void *))GenLabel;
stmt->st_Tok = TokLabelId;
stmt->st_LexIdx = LFBase->lf_Index;
if ((sem = FindSymbolId(LexSym, TokLabelId)) == NULL) {
label = AllocLabel();
SemanticAddTopBlock(LexSym, TokLabelId, (void *)label);
} else {
label = (long)sem->Data;
}
stmt->Label = label;
t = SkipToken(GetToken(), TokColon);
/*
* normally label: is bundled with a statement. However, there are
* a few special cases where this is not so.
*/
if (t != TokRBrace && t != TokCase && t != TokDefault)
t = CompStmtDeclExp(t, &stmt->Stmt1, 1);
return(t);
}
/*
* return exp;
*/
short
CompReturn(short t, Stmt **pstmt)
{
ReturnStmt *stmt = AllocTmpStructure(ReturnStmt);
*pstmt = (Stmt *)stmt;
stmt->st_Func = (void (*)(void *))GenReturn;
stmt->st_Tok = TokReturn;
stmt->st_LexIdx = LFBase->lf_Index;
if (t != TokSemi) {
t = CompStmtDeclExp(t, &stmt->Stmt1, 0); /* exp */
if (stmt->Stmt1->st_Tok != TokExp)
zerror(EFATAL_SYNTAX_ERROR_EXP);
/* save result */
stmt->Stmt1->st_Func = (void (*)(void *))GenExpResult;
}
t = SkipToken(t, TokSemi);
return(t);
}
/*
* __breakpoint
*/
short
CompBreakPoint(short t, Stmt **pstmt)
{
BreakPointStmt *stmt = AllocTmpStructure(BreakPointStmt);
*pstmt = (Stmt *)stmt;
stmt->st_Func = (void (*)(void *))GenBreakPoint;
stmt->st_Tok = TokBreakPoint;
stmt->st_LexIdx = LFBase->lf_Index;
return(t);
}