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Support repeat and forever statements.

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This commit is contained in:
Wilson Snyder
2009-02-25 22:06:59 -05:00
parent 8fe0c3dd84
commit d60d0a60c7
11 changed files with 129 additions and 12 deletions
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src/V3Begin.cpp
+35
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@@ -47,6 +47,7 @@ private:
AstModule* m_modp; // Current module
AstNodeFTask* m_ftaskp; // Current function/task
string m_beginScope; // Name of begin blocks above us
int m_repeatNum; // Repeat counter
// METHODS
static int debug() {
@@ -58,6 +59,7 @@ private:
// VISITORS
virtual void visit(AstModule* nodep, AstNUser*) {
m_modp = nodep;
m_repeatNum = 0;
nodep->iterateChildren(*this);
m_modp = NULL;
}
@@ -136,6 +138,38 @@ private:
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,
new AstRange(nodep->fileline(), countp->width()-1, 0));
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
@@ -161,6 +195,7 @@ public:
BeginVisitor(AstNetlist* nodep) {
m_modp = NULL;
m_ftaskp = NULL;
m_repeatNum = 0;
nodep->accept(*this);
}
virtual ~BeginVisitor() {}