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This is a minimal import of the emscripten "fastcomp" LLVM patchset. All it contains is the target definitions necessary to create a TargetMachine with the correct data layout. With this rustc can emit LLVM IR that emcc will run through the PNaCl lagalizer and the JS backend to generate asm.js.
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@@ -224,6 +224,7 @@ set(LLVM_ALL_TARGETS | |
| ARM | ||
| BPF | ||
| Hexagon | ||
| JSBackend # @LOCALMOD | ||
| Mips | ||
| MSP430 | ||
| NVPTX | ||
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| @@ -0,0 +1,10 @@ | ||
| add_llvm_target(JSBackendCodeGen | ||
| JSBackend.cpp | ||
| JSTargetMachine.cpp | ||
| JSTargetTransformInfo.cpp | ||
| ) | ||
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| add_dependencies(LLVMJSBackendCodeGen intrinsics_gen) | ||
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| add_subdirectory(TargetInfo) | ||
| add_subdirectory(MCTargetDesc) |
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| //===-- JS.h - Top-level interface for JS representation ------*- C++ -*-===// | ||
| // | ||
| // The LLVM Compiler Infrastructure | ||
| // | ||
| // This file is distributed under the University of Illinois Open Source | ||
| // License. See LICENSE.TXT for details. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This file contains the entry points for global functions defined in the JS | ||
| // target library, as used by the LLVM JIT. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef TARGET_JS_H | ||
| #define TARGET_JS_H | ||
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| namespace llvm { | ||
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| class JSTargetMachine; | ||
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| } // End llvm namespace | ||
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| #endif |
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| //===-- JSBackend.cpp - Library for converting LLVM code to JS -----===// | ||
| // | ||
| // The LLVM Compiler Infrastructure | ||
| // | ||
| // This file is distributed under the University of Illinois Open Source | ||
| // License. See LICENSE.TXT for details. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This file implements compiling of LLVM IR, which is assumed to have been | ||
| // simplified using the PNaCl passes, i64 legalization, and other necessary | ||
| // transformations, into JavaScript in asm.js format, suitable for passing | ||
| // to emscripten for final processing. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include "JSTargetMachine.h" | ||
| #include "MCTargetDesc/JSBackendMCTargetDesc.h" | ||
| #include "llvm/Target/TargetMachine.h" | ||
| #include "llvm/Target/TargetSubtargetInfo.h" | ||
| #include "llvm/Target/TargetLowering.h" | ||
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| using namespace llvm; | ||
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| extern "C" void LLVMInitializeJSBackendTarget() { | ||
| // Register the target. | ||
| RegisterTargetMachine<JSTargetMachine> X(TheJSBackendTarget); | ||
| } | ||
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| //===----------------------------------------------------------------------===// | ||
| // External Interface declaration | ||
| //===----------------------------------------------------------------------===// | ||
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| bool JSTargetMachine::addPassesToEmitFile( | ||
| PassManagerBase &PM, raw_pwrite_stream &Out, CodeGenFileType FileType, | ||
| bool DisableVerify, AnalysisID StartBefore, | ||
| AnalysisID StartAfter, AnalysisID StopAfter, | ||
| MachineFunctionInitializer *MFInitializer) { | ||
| return false; | ||
| } |
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| //===-- JSTargetMachine.cpp - Define TargetMachine for the JS -------------===// | ||
| // | ||
| // The LLVM Compiler Infrastructure | ||
| // | ||
| // This file is distributed under the University of Illinois Open Source | ||
| // License. See LICENSE.TXT for details. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This file defines the JS specific subclass of TargetMachine. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include "JSTargetMachine.h" | ||
| #include "JSTargetTransformInfo.h" | ||
| #include "llvm/Analysis/TargetTransformInfo.h" | ||
| #include "llvm/Support/TargetRegistry.h" | ||
| using namespace llvm; | ||
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| extern const llvm::SubtargetFeatureKV JSSubTypeKV[] = { | ||
| { "asmjs", "Select the asmjs processor", { }, { } } | ||
| }; | ||
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| static const llvm::SubtargetInfoKV JSProcSchedModels[] = { | ||
| { "asmjs", &MCSchedModel::GetDefaultSchedModel() } | ||
| }; | ||
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| JSSubtarget::JSSubtarget(const TargetMachine& TM, const Triple &TT) : | ||
| TargetSubtargetInfo(TT, "asmjs", "asmjs", None, makeArrayRef(JSSubTypeKV, 1), JSProcSchedModels, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr), | ||
| TL(TM) | ||
| {} | ||
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| JSTargetMachine::JSTargetMachine(const Target &T, const Triple &TT, | ||
| StringRef CPU, StringRef FS, const TargetOptions &Options, | ||
| Optional<Reloc::Model>& RM, CodeModel::Model CM, | ||
| CodeGenOpt::Level OL) | ||
| : LLVMTargetMachine(T, "e-p:32:32-i64:64-v128:32:128-n32-S128", TT, | ||
| CPU, FS, Options, Reloc::Static, CM, OL), | ||
| ST(*this, TT) { | ||
| } | ||
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| TargetIRAnalysis JSTargetMachine::getTargetIRAnalysis() { | ||
| return TargetIRAnalysis([this](const Function &F) { | ||
| return TargetTransformInfo(JSTTIImpl(this, F)); | ||
| }); | ||
| } | ||
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| //===-- JSTargetMachine.h - TargetMachine for the JS Backend ----*- C++ -*-===// | ||
| // | ||
| // The LLVM Compiler Infrastructure | ||
| // | ||
| // This file is distributed under the University of Illinois Open Source | ||
| // License. See LICENSE.TXT for details. | ||
| // | ||
| //===---------------------------------------------------------------------===// | ||
| // | ||
| // This file declares the TargetMachine that is used by the JS/asm.js/ | ||
| // emscripten backend. | ||
| // | ||
| //===---------------------------------------------------------------------===// | ||
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| #ifndef JSTARGETMACHINE_H | ||
| #define JSTARGETMACHINE_H | ||
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| #include "JS.h" | ||
| #include "llvm/Target/TargetMachine.h" | ||
| #include "llvm/Target/TargetSubtargetInfo.h" | ||
| #include "llvm/Target/TargetLowering.h" | ||
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| namespace llvm { | ||
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| class formatted_raw_ostream; | ||
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| class JSTargetLowering : public TargetLowering { | ||
| public: | ||
| explicit JSTargetLowering(const TargetMachine& TM) : TargetLowering(TM) {} | ||
| }; | ||
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| class JSSubtarget : public TargetSubtargetInfo { | ||
| JSTargetLowering TL; | ||
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| public: | ||
| JSSubtarget(const TargetMachine& TM, const Triple &TT); | ||
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| const TargetLowering *getTargetLowering() const override { | ||
| return &TL; | ||
| } | ||
| }; | ||
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| class JSTargetMachine : public LLVMTargetMachine { | ||
| const JSSubtarget ST; | ||
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| public: | ||
| JSTargetMachine(const Target &T, const Triple &TT, | ||
| StringRef CPU, StringRef FS, const TargetOptions &Options, | ||
| Optional<Reloc::Model>& RM, CodeModel::Model CM, | ||
| CodeGenOpt::Level OL); | ||
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| bool addPassesToEmitFile( | ||
| PassManagerBase &PM, raw_pwrite_stream &Out, CodeGenFileType FileType, | ||
| bool DisableVerify = true, AnalysisID StartBefore = nullptr, | ||
| AnalysisID StartAfter = nullptr, AnalysisID StopAfter = nullptr, | ||
| MachineFunctionInitializer *MFInitializer = nullptr) override; | ||
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| TargetIRAnalysis getTargetIRAnalysis() override; | ||
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| const TargetSubtargetInfo *getJSSubtargetImpl() const { | ||
| return &ST; | ||
| } | ||
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| const JSSubtarget *getSubtargetImpl(const Function &F) const override { | ||
| return &ST; | ||
| } | ||
| }; | ||
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| } // End llvm namespace | ||
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| #endif |
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