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Compiler: Fix return omission with else-after-return.

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Imported from SM: https://bugs.alliedmods.net/show_bug.cgi?id=4852.
This commit is contained in:
Arkshine 2014-08-13 18:43:32 +02:00
parent 9b5c6bfff0
commit 95f3b0d354
2 changed files with 19 additions and 6 deletions
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1
compiler/libpc300/sc.h
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@ -370,6 +370,7 @@ typedef struct s_stringpair {
#define tLABEL 331 #define tLABEL 331
#define tSTRING 332 #define tSTRING 332
#define tEXPR 333 /* for assigment to "lastst" only */ #define tEXPR 333 /* for assigment to "lastst" only */
#define tEMPTYBLOCK 334 /* empty blocks for AM bug 4825 */
/* (reversed) evaluation of staging buffer */ /* (reversed) evaluation of staging buffer */
#define sSTARTREORDER 0x01 #define sSTARTREORDER 0x01

24
compiler/libpc300/sc1.c
View File

@ -113,7 +113,7 @@ static int doexpr(int comma,int chkeffect,int allowarray,int mark_endexpr,
static void doassert(void); static void doassert(void);
static void doexit(void); static void doexit(void);
static void test(int label,int parens,int invert); static void test(int label,int parens,int invert);
static void doif(void); static int doif(void);
static void dowhile(void); static void dowhile(void);
static void dodo(void); static void dodo(void);
static void dofor(void); static void dofor(void);
@ -4572,16 +4572,19 @@ static void statement(int *lastindent,int allow_decl)
break; break;
case '{': case '{':
tok=fline; tok=fline;
if (!matchtoken('}')) /* {} is the empty statement */ if (!matchtoken('}')) { /* {} is the empty statement */
compound(tok==fline); compound(tok==fline);
/* lastst (for "last statement") does not change */ } else {
lastst = tEMPTYBLOCK;
}
/* lastst (for "last statement") does not change
you're not my father, don't tell me what to do */
break; break;
case ';': case ';':
error(36); /* empty statement */ error(36); /* empty statement */
break; break;
case tIF: case tIF:
doif(); lastst=doif();
lastst=tIF;
break; break;
case tWHILE: case tWHILE:
dowhile(); dowhile();
@ -4851,10 +4854,11 @@ static void test(int label,int parens,int invert)
} /* if */ } /* if */
} }
static void doif(void) static int doif(void)
{ {
int flab1,flab2; int flab1,flab2;
int ifindent; int ifindent;
int lastst_true;
ifindent=stmtindent; /* save the indent of the "if" instruction */ ifindent=stmtindent; /* save the indent of the "if" instruction */
flab1=getlabel(); /* get label number for false branch */ flab1=getlabel(); /* get label number for false branch */
@ -4863,6 +4867,7 @@ static void doif(void)
if (matchtoken(tELSE)==0){ /* if...else ? */ if (matchtoken(tELSE)==0){ /* if...else ? */
setlabel(flab1); /* no, simple if..., print false label */ setlabel(flab1); /* no, simple if..., print false label */
} else { } else {
lastst_true=lastst;
/* to avoid the "dangling else" error, we want a warning if the "else" /* to avoid the "dangling else" error, we want a warning if the "else"
* has a lower indent than the matching "if" */ * has a lower indent than the matching "if" */
if (stmtindent<ifindent && sc_tabsize>0) if (stmtindent<ifindent && sc_tabsize>0)
@ -4873,7 +4878,14 @@ static void doif(void)
setlabel(flab1); /* print false label */ setlabel(flab1); /* print false label */
statement(NULL,FALSE); /* do "else" clause */ statement(NULL,FALSE); /* do "else" clause */
setlabel(flab2); /* print true label */ setlabel(flab2); /* print true label */
/* if both the "true" branch and the "false" branch ended with the same
* kind of statement, set the last statement id to that kind, rather than
* to the generic tIF; this allows for better "unreachable code" checking
*/
if (lastst == lastst_true)
return lastst;
} /* endif */ } /* endif */
return tIF;
} }
static void dowhile(void) static void dowhile(void)