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Avoid redundant allocations in the linker optimisation hint
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210747 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -96,6 +96,19 @@ static inline int MCLOHIdToNbArgs(MCLOHType Kind) {
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return -1;
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}
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namespace {
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class raw_counting_ostream : public raw_ostream {
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uint64_t Count = 0;
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void write_impl(const char *, size_t size) override { Count += size; }
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uint64_t current_pos() const override { return Count; }
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public:
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~raw_counting_ostream() { flush(); }
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};
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}
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/// Store Linker Optimization Hint information (LOH).
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class MCLOHDirective {
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MCLOHType Kind;
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@ -132,8 +145,7 @@ public:
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/// the given @p Layout.
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uint64_t getEmitSize(const MachObjectWriter &ObjWriter,
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const MCAsmLayout &Layout) const {
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std::string Buffer;
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raw_string_ostream OutStream(Buffer);
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raw_counting_ostream OutStream;
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Emit_impl(OutStream, ObjWriter, Layout);
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return OutStream.tell();
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}
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