forked from OSchip/llvm-project
instead of keeping track of Constant/alignment pairs, actually compute the
offset of each entry from the start of the constant pool. llvm-svn: 26077
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@ -24,42 +24,39 @@
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#include <vector>
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#include <iosfwd>
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#include <cassert>
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namespace llvm {
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class Constant;
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class TargetData;
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/// MachineConstantPoolEntry - One entry in the constant pool.
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///
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struct MachineConstantPoolEntry {
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/// Val - The constant itself.
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Constant *Val;
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/// Alignment - The alignment of the constant.
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unsigned Alignment;
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/// Offset - The offset of the constant from the start of the constant pool.
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unsigned Offset;
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MachineConstantPoolEntry(Constant *V, unsigned A) : Val(V), Alignment(A) {}
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MachineConstantPoolEntry(Constant *V, unsigned O) : Val(V), Offset(O) {}
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};
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class MachineConstantPool {
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const TargetData &TD;
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unsigned PoolAlignment;
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std::vector<MachineConstantPoolEntry> Constants;
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public:
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MachineConstantPool(const TargetData &td) : TD(td), PoolAlignment(1) {}
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/// getConstantPoolAlignment - Return the log2 of the alignment required by
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/// the whole constant pool, of which the first element must be aligned.
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unsigned getConstantPoolAlignment() const { return PoolAlignment; }
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/// getConstantPoolIndex - Create a new entry in the constant pool or return
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/// an existing one. User must specify an alignment in bytes for the object.
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///
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unsigned getConstantPoolIndex(Constant *C, unsigned Alignment) {
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assert(Alignment && "Alignment must be specified!");
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// Check to see if we already have this constant.
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//
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// FIXME, this could be made much more efficient for large constant pools.
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for (unsigned i = 0, e = Constants.size(); i != e; ++i)
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if (Constants[i].Val == C && Constants[i].Alignment >= Alignment)
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return i;
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Constants.push_back(MachineConstantPoolEntry(C, Alignment));
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return Constants.size()-1;
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}
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unsigned getConstantPoolIndex(Constant *C, unsigned Alignment);
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/// isEmpty - Return true if this constant pool contains no constants.
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///
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bool isEmpty() const { return Constants.empty(); }
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@ -74,6 +71,7 @@ public:
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void print(std::ostream &OS) const;
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/// dump - Call print(std::cerr) to be called from the debugger.
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///
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void dump() const;
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};
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