[bpf] add support for BPF backend

add support for bpfel/bpfeb targets

llvm-svn: 239496

1 files changed, 58 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 9c559796795..6b4712a918b 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -5896,6 +5896,60 @@ validateAsmConstraint(const char *&Name,
                           unsigned &NumAliases) const override {}
   };
 
+class BPFTargetInfo : public TargetInfo {
+public:
+  BPFTargetInfo(const llvm::Triple &Triple) : TargetInfo(Triple) {
+    LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
+    SizeType    = UnsignedLong;
+    PtrDiffType = SignedLong;
+    IntPtrType  = SignedLong;
+    IntMaxType  = SignedLong;
+    Int64Type   = SignedLong;
+    RegParmMax = 5;
+    if (Triple.getArch() == llvm::Triple::bpfeb) {
+      BigEndian = true;
+      DescriptionString = "E-m:e-p:64:64-i64:64-n32:64-S128";
+    } else {
+      BigEndian = false;
+      DescriptionString = "e-m:e-p:64:64-i64:64-n32:64-S128";
+    }
+    MaxAtomicPromoteWidth = 64;
+    MaxAtomicInlineWidth = 64;
+    TLSSupported = false;
+  }
+  void getTargetDefines(const LangOptions &Opts,
+                        MacroBuilder &Builder) const override {
+    DefineStd(Builder, "bpf", Opts);
+    Builder.defineMacro("__BPF__");
+  }
+  bool hasFeature(StringRef Feature) const override {
+    return Feature == "bpf";
+  }
+
+  void getTargetBuiltins(const Builtin::Info *&Records,
+                         unsigned &NumRecords) const override {}
+  const char *getClobbers() const override {
+    return "";
+  }
+  BuiltinVaListKind getBuiltinVaListKind() const override {
+    return TargetInfo::VoidPtrBuiltinVaList;
+  }
+  void getGCCRegNames(const char * const *&Names,
+                      unsigned &NumNames) const override {
+    Names = nullptr;
+    NumNames = 0;
+  }
+  bool validateAsmConstraint(const char *&Name,
+                             TargetInfo::ConstraintInfo &info) const override {
+    return true;
+  }
+  void getGCCRegAliases(const GCCRegAlias *&Aliases,
+                        unsigned &NumAliases) const override {
+    Aliases = nullptr;
+    NumAliases = 0;
+  }
+};
+
 class MipsTargetInfoBase : public TargetInfo {
   virtual void setDescriptionString() = 0;
 
@@ -6894,6 +6948,10 @@ static TargetInfo *AllocateTarget(const llvm::Triple &Triple) {
       return new ARMbeTargetInfo(Triple);
     }
 
+  case llvm::Triple::bpfeb:
+  case llvm::Triple::bpfel:
+    return new BPFTargetInfo(Triple);
+
   case llvm::Triple::msp430:
     return new MSP430TargetInfo(Triple);