mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-11-02 07:43:42 +08:00
Chris Tate
640001b260
Optimized executables with at most 1 MiB of LLVM text were compiled as one module on one thread. With more than 128 KiB of LLVM text they now pass several outputs and `--split codegen` to the LLVM helper. The helper optimizes the module whole, as for a single output, then divides its functions in module order into runs of about the same instruction count and generates code for each run on its own thread. - The output count is 4 or 8 and depends only on the module's size (nativeCodegenParts), so artifacts never vary with the host. Node and native compiler builds pass the same outputs. - The helper writes the optimized module to bitcode once with its use-list order. Every output after the first parses it and turns the other outputs' definitions into declarations; the first output does the same to the optimized module in place. Each function's machine code matches a single-output build except for jumps to a definition that another output also uses. - Only local definitions that another output uses become hidden. Dead constant users are dropped before unused declarations are removed, so no output names a thread-local variable it does not use. - When one run would hold more than three quarters of the instructions, the first output is generated from the optimized module as for a single output and the others are empty objects. - Dev builds, partitioned builds and program-object validation are unchanged.
38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
#pragma once
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#include <optional>
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#include <string>
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#include <vector>
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namespace scriptc {
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struct EmitOptions {
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std::string Input;
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// One output per program partition; several require object output.
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std::vector<std::string> Outputs;
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std::string FileType = "obj";
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std::string Target;
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std::string OptLevel = "2";
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std::string RelocationModel = "pic";
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std::string DiagnosticFormat = "json";
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std::string SourcePath;
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// Runtime bitcode whose small functions are imported available_externally.
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std::vector<std::string> ImportBitcode;
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// Private directory for reusable partition artifacts; empty disables reuse.
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std::string CacheDirectory;
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// Instruments the program for IR profiling. The instrumented executable
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// writes raw profiles to this path pattern (LLVM_PROFILE_FILE overrides it
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// at run time). Empty: no instrumentation.
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std::string ProfileGenerate;
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// Indexed profile (.profdata) that guides optimization. Empty: none.
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std::string ProfileUse;
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// With several outputs: optimize the module whole and divide only its code
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// generation among the outputs.
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bool SplitCodegen = false;
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};
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std::optional<EmitOptions> parseEmitOptions(int Argc, char **Argv);
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int emit(const EmitOptions &Options);
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} // namespace scriptc
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