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operation all-or-nothing, rather than allowing materialization on a per-symbol basis. This addresses a shortcoming of per-symbol materialization: If a MaterializationUnit (/SymbolSource) wants to materialize more symbols than requested (which is likely: most materializers will want to materialize whole modules) then it needs a way to notify the symbol table about the extra symbols being materialized. This process (checking what has been requested against what is being provided and notifying the symbol table about the difference) has to be repeated at every level of the JIT stack. Making materialization all-or-nothing eliminates this issue, simplifying both materializer implementations and the symbol table (VSO class) API. The cost is that per-symbol materialization (e.g. for individual symbols in a module) now requires multiple MaterializationUnits. llvm-svn: 327946 |
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