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How to be dumb on $5/day. Need a tri-state to track valid debug descriptors.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27154 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -773,16 +773,21 @@ public:
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/// GlobalVariables are valid as DebugInfoDesc objects.
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class DIVerifier {
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private:
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enum {
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Unknown = 0,
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Invalid,
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Valid
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};
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unsigned DebugVersion; // Version of debug information in use.
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std::set<GlobalVariable *> Visited; // Tracks visits during recursion.
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std::map<GlobalVariable *, unsigned> Validity;// Tracks prior results.
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std::map<unsigned, unsigned> Counts; // Count of fields per Tag type.
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/// markVisited - Return true if the GlobalVariable hase been "seen" before.
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/// Mark markVisited otherwise.
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bool markVisited(GlobalVariable *GV);
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public:
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DIVerifier() : DebugVersion(LLVMDebugVersion) {}
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DIVerifier()
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: DebugVersion(LLVMDebugVersion)
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, Validity()
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, Counts()
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{}
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~DIVerifier() {}
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/// Verify - Return true if the GlobalVariable appears to be a valid
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@ -1320,30 +1320,24 @@ GlobalVariable *DISerializer::Serialize(DebugInfoDesc *DD) {
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//===----------------------------------------------------------------------===//
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/// markVisited - Return true if the GlobalVariable hase been "seen" before.
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/// Mark visited otherwise.
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bool DIVerifier::markVisited(GlobalVariable *GV) {
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// Check if the GlobalVariable is already in the Visited set.
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std::set<GlobalVariable *>::iterator VI = Visited.lower_bound(GV);
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// See if GlobalVariable exists.
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bool Exists = VI != Visited.end() && *VI == GV;
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// Insert in set.
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if (!Exists) Visited.insert(VI, GV);
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return Exists;
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}
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/// Verify - Return true if the GlobalVariable appears to be a valid
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/// serialization of a DebugInfoDesc.
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bool DIVerifier::Verify(Value *V) {
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return Verify(getGlobalVariable(V));
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}
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bool DIVerifier::Verify(GlobalVariable *GV) {
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// Check if seen before.
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if (markVisited(GV)) return true;
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// NULLs are valid.
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if (!GV) return true;
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// Check prior validity.
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unsigned &ValiditySlot = Validity[GV];
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// If visited before then use old state.
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if (ValiditySlot) return ValiditySlot == Valid;
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// Assume validity for the time being (recursion.)
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ValiditySlot = Valid;
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// Get the Tag
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unsigned Tag = DebugInfoDesc::TagFromGlobal(GV);
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@ -1354,7 +1348,10 @@ bool DIVerifier::Verify(GlobalVariable *GV) {
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if (Tag == DW_TAG_compile_unit) {
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DebugVersion = CompileUnitDesc::DebugVersionFromGlobal(GV);
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// FIXME - In the short term, changes are too drastic to continue.
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if (DebugVersion != LLVMDebugVersion) return false;
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if (DebugVersion != LLVMDebugVersion) {
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ValiditySlot = Invalid;
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return false;
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}
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}
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// Construct an empty DebugInfoDesc.
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@ -1370,17 +1367,18 @@ bool DIVerifier::Verify(GlobalVariable *GV) {
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unsigned N = CI->getNumOperands();
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// Get the field count.
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unsigned &Slot = Counts[Tag];
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if (!Slot) {
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unsigned &CountSlot = Counts[Tag];
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if (!CountSlot) {
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// Check the operand count to the field count
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DICountVisitor CTAM;
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CTAM.ApplyToFields(DD);
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Slot = CTAM.getCount();
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CountSlot = CTAM.getCount();
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}
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// Field count must be at most equal operand count.
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if (Slot > N) {
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if (CountSlot > N) {
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delete DD;
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ValiditySlot = Invalid;
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return false;
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}
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@ -1391,8 +1389,13 @@ bool DIVerifier::Verify(GlobalVariable *GV) {
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// Release empty DebugInfoDesc.
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delete DD;
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// Return result of field tests.
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return VRAM.isValid();
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// If fields are not valid.
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if (!VRAM.isValid()) {
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ValiditySlot = Invalid;
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return false;
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}
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return true;
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}
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//===----------------------------------------------------------------------===//
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