Commit 5500b773 authored by Kevin Modzelewski's avatar Kevin Modzelewski

Fix some vreg-reuse confusion

parent a0529f48
......@@ -158,11 +158,10 @@ bool LivenessAnalysis::isLiveAtEnd(int vreg, CFGBlock* block) {
if (vreg < block->cfg->getVRegInfo().getNumOfUserVisibleVRegs())
return true;
// For block-local vregs, this query doesn't really make sense,
// since the vreg will be live but that's probably not what we care about.
// It's probably safe to return false, but let's just error for now.
#ifndef NDEBUG
if (block->cfg->getVRegInfo().isBlockLocalVReg(vreg))
return false;
#endif
if (block->successors.size() == 0)
return false;
......@@ -206,6 +205,14 @@ bool LivenessAnalysis::isLiveAtEnd(int vreg, CFGBlock* block) {
us_liveness.log(_t.end());
}
// For block-local vregs, this query doesn't really make sense,
// since the vreg will be live but that's probably not what we care about.
// It's probably safe to return false, but let's just error for now.
if (block->cfg->getVRegInfo().isBlockLocalVReg(vreg)) {
ASSERT(!result_cache[vreg][block], "%d in %d", vreg, block->idx);
return false;
}
return result_cache[vreg][block];
}
......
......@@ -232,6 +232,9 @@ private:
CFGBlock* exc_dest;
// variable names to store the exception (type, value, traceback) in
InternedString exc_type_name, exc_value_name, exc_traceback_name;
// Similar to did_why: says whether the block might have been jumped-to
bool maybe_taken;
};
// ---------- Member fields ----------
......@@ -1576,6 +1579,7 @@ public:
curblock->connectTo(exc_dest);
ExcBlockInfo& exc_info = exc_handlers.back();
exc_info.maybe_taken = true;
curblock = exc_dest;
// TODO: need to clear some temporaries here
......@@ -2341,7 +2345,7 @@ public:
InternedString exc_type_name = nodeName("type");
InternedString exc_value_name = nodeName("value");
InternedString exc_traceback_name = nodeName("traceback");
exc_handlers.push_back({ exc_handler_block, exc_type_name, exc_value_name, exc_traceback_name });
exc_handlers.push_back({ exc_handler_block, exc_type_name, exc_value_name, exc_traceback_name, false });
for (AST_stmt* subnode : node->body) {
subnode->accept(this);
......@@ -2464,7 +2468,7 @@ public:
InternedString exc_value_name = nodeName("value");
InternedString exc_traceback_name = nodeName("traceback");
InternedString exc_why_name = nodeName("why");
exc_handlers.push_back({ exc_handler_block, exc_type_name, exc_value_name, exc_traceback_name });
exc_handlers.push_back({ exc_handler_block, exc_type_name, exc_value_name, exc_traceback_name, false });
CFGBlock* finally_block = cfg->addDeferredBlock();
pushFinallyContinuation(finally_block, exc_why_name);
......@@ -2475,6 +2479,7 @@ public:
break;
}
bool maybe_exception = exc_handlers.back().maybe_taken;
exc_handlers.pop_back();
int did_why = continuations.back().did_why; // bad to just reach in like this
......@@ -2512,15 +2517,17 @@ public:
exitFinallyIf(node, Why::BREAK, exc_why_name);
if (did_why & (1 << Why::CONTINUE))
exitFinallyIf(node, Why::CONTINUE, exc_why_name);
if (maybe_exception) {
CFGBlock* reraise = cfg->addDeferredBlock();
CFGBlock* noexc = makeFinallyCont(Why::EXCEPTION, makeLoad(exc_why_name, node, true), reraise);
CFGBlock* reraise = cfg->addDeferredBlock();
CFGBlock* noexc = makeFinallyCont(Why::EXCEPTION, makeLoad(exc_why_name, node, true), reraise);
cfg->placeBlock(reraise);
curblock = reraise;
pushReraise(getLastLinenoSub(node->finalbody.back()), exc_type_name, exc_value_name, exc_traceback_name);
cfg->placeBlock(reraise);
curblock = reraise;
pushReraise(getLastLinenoSub(node->finalbody.back()), exc_type_name, exc_value_name,
exc_traceback_name);
curblock = noexc;
curblock = noexc;
}
}
return true;
......@@ -2585,7 +2592,7 @@ public:
CFGBlock* exc_block = cfg->addDeferredBlock();
exc_block->info = "with_exc";
exc_handlers.push_back({ exc_block, exc_type_name, exc_value_name, exc_traceback_name });
exc_handlers.push_back({ exc_block, exc_type_name, exc_value_name, exc_traceback_name, false });
for (int i = 0; i < node->body.size(); i++) {
node->body[i]->accept(this);
......
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