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Support "break", "continue", "return".

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This commit is contained in:
Wilson Snyder
2010-02-14 10:01:21 -05:00
parent 48603c0ee2
commit cdd06e7236
28 changed files with 761 additions and 84 deletions
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src/V3Begin.cpp
-47
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@@ -135,53 +135,6 @@ private:
m_modp->addStmtp(nodep);
}
}
virtual void visit(AstFor* nodep, AstNUser*) {
// So later optimizations don't need to deal with them,
// FOR(init,cond,assign,body) -> init,WHILE(cond) { body, assign }
AstNode* initsp = nodep->initsp(); if (initsp) initsp->unlinkFrBackWithNext();
AstNode* condp = nodep->condp(); if (condp) condp->unlinkFrBackWithNext();
AstNode* incsp = nodep->incsp(); if (incsp) incsp->unlinkFrBackWithNext();
AstNode* bodysp = nodep->bodysp(); if (bodysp) bodysp->unlinkFrBackWithNext();
bodysp = bodysp->addNext(incsp);
AstNode* newp = new AstWhile(nodep->fileline(),
condp,
bodysp);
initsp = initsp->addNext(newp);
newp = initsp;
nodep->replaceWith(newp);
nodep->deleteTree(); nodep=NULL;
}
virtual void visit(AstRepeat* nodep, AstNUser*) {
// So later optimizations don't need to deal with them,
// REPEAT(count,body) -> loop=count,WHILE(loop>0) { body, loop-- }
// Note var can be signed or unsigned based on original number.
AstNode* countp = nodep->countp()->unlinkFrBackWithNext();
string name = string("__Vrepeat")+cvtToStr(m_repeatNum++);
AstVar* varp = new AstVar(nodep->fileline(), AstVarType::BLOCKTEMP, name, AstLogicPacked(), countp->width());
m_modp->addStmtp(varp);
AstNode* initsp = new AstAssign(nodep->fileline(), new AstVarRef(nodep->fileline(), varp, true),
countp);
AstNode* decp = new AstAssign(nodep->fileline(), new AstVarRef(nodep->fileline(), varp, true),
new AstSub(nodep->fileline(), new AstVarRef(nodep->fileline(), varp, false),
new AstConst(nodep->fileline(), 1)));
AstNode* condp;
if (countp->isSigned()) {
condp = new AstGtS(nodep->fileline(), new AstVarRef(nodep->fileline(), varp, false),
new AstConst(nodep->fileline(), 0));
} else {
condp = new AstGt (nodep->fileline(), new AstVarRef(nodep->fileline(), varp, false),
new AstConst(nodep->fileline(), 0));
}
AstNode* bodysp = nodep->bodysp(); if (bodysp) bodysp->unlinkFrBackWithNext();
bodysp = bodysp->addNext(decp);
AstNode* newp = new AstWhile(nodep->fileline(),
condp,
bodysp);
initsp = initsp->addNext(newp);
newp = initsp;
nodep->replaceWith(newp);
nodep->deleteTree(); nodep=NULL;
}
virtual void visit(AstScopeName* nodep, AstNUser*) {
// If there's a %m in the display text, we add a special node that will contain the name()
// Similar code in V3Inline