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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/V3Life.cpp
+23 -1
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@@ -288,6 +288,7 @@ private:
// STATE
LifeState* m_statep; // Current state
bool m_sideEffect; // Side effects discovered in assign RHS
bool m_noopt; // Disable optimization of variables in this block
// LIFE MAP
// For each basic block, we'll make a new map of what variables that if/else is changing
@@ -327,7 +328,7 @@ private:
V3Const::constifyEdit(nodep->rhsp()); // rhsp may change
}
// Has to be direct assignment without any EXTRACTing.
if (nodep->lhsp()->castVarRef() && !m_sideEffect) {
if (nodep->lhsp()->castVarRef() && !m_sideEffect && !m_noopt) {
AstVarScope* vscp = nodep->lhsp()->castVarRef()->varScopep();
if (!vscp) nodep->v3fatalSrc("Scope lost on variable");
m_lifep->simpleAssign(vscp, nodep);
@@ -388,6 +389,7 @@ private:
{
m_lifep = bodyLifep;
nodep->bodysp()->iterateAndNext(*this);
nodep->incsp()->iterateAndNext(*this);
m_lifep = prevLifep;
}
UINFO(4," joinfor"<<endl);
@@ -397,6 +399,25 @@ private:
delete condLifep;
delete bodyLifep;
}
virtual void visit(AstJumpLabel* nodep, AstNUser*) {
// As with While's we can't predict if a JumpGo will kill us or not
// It's worse though as an IF(..., JUMPGO) may change the control flow.
// Just don't optimize blocks with labels; they're rare - so far.
LifeBlock* prevLifep = m_lifep;
LifeBlock* bodyLifep = new LifeBlock (prevLifep, m_statep);
bool prev_noopt = m_noopt;
{
m_lifep = bodyLifep;
m_noopt = true;
nodep->stmtsp()->iterateAndNext(*this);
m_lifep = prevLifep;
m_noopt = prev_noopt;
}
UINFO(4," joinjump"<<endl);
// For the next assignments, clear any variables that were read or written in the block
bodyLifep->lifeToAbove();
delete bodyLifep;
}
virtual void visit(AstCCall* nodep, AstNUser*) {
//UINFO(4," CCALL "<<nodep<<endl);
nodep->iterateChildren(*this);
@@ -432,6 +453,7 @@ public:
UINFO(4," LifeVisitor on "<<nodep<<endl);
m_statep = statep;
m_sideEffect = false;
m_noopt = false;
{
m_lifep = new LifeBlock (NULL, m_statep);
nodep->accept(*this);