Add support for musl-libc on ARM Linux.

Patch by Lei Zhang!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273726 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/Triple.h

@@ -180,6 +180,8 @@ class Triple {
     EABIHF,
     Android,
     Musl,
+    MuslEABI,
+    MuslEABIHF,
 
     MSVC,
     Itanium,
@@ -571,6 +573,13 @@ class Triple {
   /// Tests whether the target is Android
   bool isAndroid() const { return getEnvironment() == Triple::Android; }
 
+  /// Tests whether the environment is musl-libc
+  bool isMusl() const {
+    return getEnvironment() == Triple::Musl ||
+           getEnvironment() == Triple::MuslEABI ||
+           getEnvironment() == Triple::MuslEABIHF;
+  }
+
   /// Tests whether the target is NVPTX (32- or 64-bit).
   bool isNVPTX() const {
     return getArch() == Triple::nvptx || getArch() == Triple::nvptx64;

lib/Support/Triple.cpp

@@ -206,6 +206,8 @@ const char *Triple::getEnvironmentTypeName(EnvironmentType Kind) {
   case EABIHF: return "eabihf";
   case Android: return "android";
   case Musl: return "musl";
+  case MuslEABI: return "musleabi";
+  case MuslEABIHF: return "musleabihf";
   case MSVC: return "msvc";
   case Itanium: return "itanium";
   case Cygnus: return "cygnus";
@@ -465,6 +467,8 @@ static Triple::EnvironmentType parseEnvironment(StringRef EnvironmentName) {
     .StartsWith("code16", Triple::CODE16)
     .StartsWith("gnu", Triple::GNU)
     .StartsWith("android", Triple::Android)
+    .StartsWith("musleabihf", Triple::MuslEABIHF)
+    .StartsWith("musleabi", Triple::MuslEABI)
     .StartsWith("musl", Triple::Musl)
     .StartsWith("msvc", Triple::MSVC)
     .StartsWith("itanium", Triple::Itanium)
@@ -1454,6 +1458,7 @@ StringRef Triple::getARMCPUForArch(StringRef MArch) const {
     switch (getEnvironment()) {
     case llvm::Triple::EABIHF:
     case llvm::Triple::GNUEABIHF:
+    case llvm::Triple::MuslEABIHF:
       return "arm1176jzf-s";
     default:
       return "arm7tdmi";

lib/Target/ARM/ARMAsmPrinter.cpp

@@ -562,7 +562,8 @@ void ARMAsmPrinter::EmitEndOfAsmFile(Module &M) {
   ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
 
   if (OptimizationGoals > 0 &&
-      (Subtarget->isTargetAEABI() || Subtarget->isTargetGNUAEABI()))
+      (Subtarget->isTargetAEABI() || Subtarget->isTargetGNUAEABI() ||
+       Subtarget->isTargetMuslAEABI()))
     ATS.emitAttribute(ARMBuildAttrs::ABI_optimization_goals, OptimizationGoals);
   OptimizationGoals = -1;
 

lib/Target/ARM/ARMISelLowering.cpp

@@ -255,7 +255,7 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM,
   // RTLIB
   if (Subtarget->isAAPCS_ABI() &&
       (Subtarget->isTargetAEABI() || Subtarget->isTargetGNUAEABI() ||
-       Subtarget->isTargetAndroid())) {
+       Subtarget->isTargetMuslAEABI() || Subtarget->isTargetAndroid())) {
     static const struct {
       const RTLIB::Libcall Op;
       const char * const Name;
@@ -793,7 +793,7 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM,
   setOperationAction(ISD::UREM,  MVT::i32, Expand);
   // Register based DivRem for AEABI (RTABI 4.2)
   if (Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid() ||
-      Subtarget->isTargetGNUAEABI()) {
+      Subtarget->isTargetGNUAEABI() || Subtarget->isTargetMuslAEABI()) {
     setOperationAction(ISD::SREM, MVT::i64, Custom);
     setOperationAction(ISD::UREM, MVT::i64, Custom);
 
@@ -12048,7 +12048,7 @@ static TargetLowering::ArgListTy getDivRemArgList(
 
 SDValue ARMTargetLowering::LowerDivRem(SDValue Op, SelectionDAG &DAG) const {
   assert((Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid() ||
-          Subtarget->isTargetGNUAEABI()) &&
+          Subtarget->isTargetGNUAEABI() || Subtarget->isTargetMuslAEABI()) &&
          "Register-based DivRem lowering only");
   unsigned Opcode = Op->getOpcode();
   assert((Opcode == ISD::SDIVREM || Opcode == ISD::UDIVREM) &&

lib/Target/ARM/ARMSubtarget.h

@@ -446,21 +446,29 @@ class ARMSubtarget : public ARMGenSubtargetInfo {
             TargetTriple.getEnvironment() == Triple::GNUEABIHF) &&
            !isTargetDarwin() && !isTargetWindows();
   }
+  bool isTargetMuslAEABI() const {
+    return (TargetTriple.getEnvironment() == Triple::MuslEABI ||
+            TargetTriple.getEnvironment() == Triple::MuslEABIHF) &&
+           !isTargetDarwin() && !isTargetWindows();
+  }
 
   // ARM Targets that support EHABI exception handling standard
   // Darwin uses SjLj. Other targets might need more checks.
   bool isTargetEHABICompatible() const {
     return (TargetTriple.getEnvironment() == Triple::EABI ||
             TargetTriple.getEnvironment() == Triple::GNUEABI ||
+            TargetTriple.getEnvironment() == Triple::MuslEABI ||
             TargetTriple.getEnvironment() == Triple::EABIHF ||
             TargetTriple.getEnvironment() == Triple::GNUEABIHF ||
+            TargetTriple.getEnvironment() == Triple::MuslEABIHF ||
             isTargetAndroid()) &&
            !isTargetDarwin() && !isTargetWindows();
   }
 
   bool isTargetHardFloat() const {
     // FIXME: this is invalid for WindowsCE
     return TargetTriple.getEnvironment() == Triple::GNUEABIHF ||
+           TargetTriple.getEnvironment() == Triple::MuslEABIHF ||
            TargetTriple.getEnvironment() == Triple::EABIHF ||
            isTargetWindows() || isAAPCS16_ABI();
   }

lib/Target/ARM/ARMTargetMachine.cpp

@@ -100,6 +100,8 @@ computeTargetABI(const Triple &TT, StringRef CPU,
     case llvm::Triple::Android:
     case llvm::Triple::GNUEABI:
     case llvm::Triple::GNUEABIHF:
+    case llvm::Triple::MuslEABI:
+    case llvm::Triple::MuslEABIHF:
     case llvm::Triple::EABIHF:
     case llvm::Triple::EABI:
       TargetABI = ARMBaseTargetMachine::ARM_ABI_AAPCS;
@@ -208,7 +210,8 @@ ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, const Triple &TT,
   // Default to triple-appropriate EABI
   if (Options.EABIVersion == EABI::Default ||
       Options.EABIVersion == EABI::Unknown) {
-    if (Subtarget.isTargetGNUAEABI())
+    // musl is compatible with glibc with regard to EABI version
+    if (Subtarget.isTargetGNUAEABI() || Subtarget.isTargetMuslAEABI())
       this->Options.EABIVersion = EABI::GNU;
     else
       this->Options.EABIVersion = EABI::EABI5;

test/CodeGen/ARM/arm-eabi.ll

@@ -3,21 +3,29 @@
 ; RUN: llc < %s -mtriple=arm-none-androideabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabihf -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
+; RUN: llc < %s -mtriple=arm-none-musleabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
+; RUN: llc < %s -mtriple=arm-none-musleabihf -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
 ; RUN: llc < %s -mtriple=arm-none-eabi -meabi=gnu -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
 ; RUN: llc < %s -mtriple=arm-none-eabihf -meabi=gnu -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
 ; RUN: llc < %s -mtriple=arm-none-androideabi -meabi=gnu -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabi -meabi=gnu -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabihf -meabi=gnu -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
+; RUN: llc < %s -mtriple=arm-none-musleabi -meabi=gnu -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
+; RUN: llc < %s -mtriple=arm-none-musleabihf -meabi=gnu -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI
 ; RUN: llc < %s -mtriple=arm-none-eabi -meabi=4 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-eabihf -meabi=4 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-androideabi -meabi=4 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabi -meabi=4 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabihf -meabi=4 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
+; RUN: llc < %s -mtriple=arm-none-musleabi -meabi=4 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
+; RUN: llc < %s -mtriple=arm-none-musleabihf -meabi=4 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-eabi -meabi=5 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-eabihf -meabi=5 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-androideabi -meabi=5 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabi -meabi=5 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 ; RUN: llc < %s -mtriple=arm-none-gnueabihf -meabi=5 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
+; RUN: llc < %s -mtriple=arm-none-musleabi -meabi=5 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
+; RUN: llc < %s -mtriple=arm-none-musleabihf -meabi=5 -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI
 
 %struct.my_s = type { [18 x i32] }
 

test/CodeGen/ARM/default-float-abi.ll

@@ -1,7 +1,10 @@
 ; RUN: llc -mtriple=armv7-linux-gnueabihf %s -o - | FileCheck %s --check-prefix=CHECK-HARD
+; RUN: llc -mtriple=armv7-linux-musleabihf %s -o - | FileCheck %s --check-prefix=CHECK-HARD
 ; RUN: llc -mtriple=armv7-linux-eabihf %s -o - | FileCheck %s --check-prefix=CHECK-HARD
 ; RUN: llc -mtriple=armv7-linux-gnueabihf -float-abi=soft %s -o - | FileCheck %s --check-prefix=CHECK-SOFT
+; RUN: llc -mtriple=armv7-linux-musleabihf -float-abi=soft %s -o - | FileCheck %s --check-prefix=CHECK-SOFT
 ; RUN: llc -mtriple=armv7-linux-gnueabi %s -o - | FileCheck %s --check-prefix=CHECK-SOFT
+; RUN: llc -mtriple=armv7-linux-musleabi %s -o - | FileCheck %s --check-prefix=CHECK-SOFT
 ; RUN: llc -mtriple=armv7-linux-eabi -float-abi=hard %s -o - | FileCheck %s --check-prefix=CHECK-HARD
 ; RUN: llc -mtriple=thumbv7-apple-ios6.0 %s -o - | FileCheck %s --check-prefix=CHECK-SOFT
 

test/CodeGen/ARM/divmod-eabi.ll

@@ -3,6 +3,7 @@
 ; All "eabi" (Bare, GNU and Android) must lower SREM/UREM to __aeabi_{u,i}divmod
 ; RUN: llc -mtriple armv7-linux-androideabi %s -o - | FileCheck %s --check-prefix=EABI
 ; RUN: llc -mtriple armv7-linux-gnueabi %s -o - | FileCheck %s --check-prefix=EABI
+; RUN: llc -mtriple armv7-linux-musleabi %s -o - | FileCheck %s --check-prefix=EABI
 ; RUN: llc -mtriple armv7-apple-darwin %s -o - | FileCheck %s --check-prefix=DARWIN
 ; FIXME: long-term, we will use "-apple-macho" and won't need this exception:
 ; RUN: llc -mtriple armv7-apple-darwin-eabi %s -o - | FileCheck %s --check-prefix=DARWIN

test/CodeGen/ARM/ehabi.ll

@@ -34,6 +34,22 @@
 ; RUN:     -filetype=asm -o - %s \
 ; RUN:   | FileCheck %s --check-prefix=CHECK-V7-FP-ELIM
 
+; RUN: llc -mtriple arm-unknown-linux-musleabi \
+; RUN:     -disable-fp-elim -filetype=asm -o - %s \
+; RUN:   | FileCheck %s --check-prefix=CHECK-FP
+
+; RUN: llc -mtriple arm-unknown-linux-musleabi \
+; RUN:     -filetype=asm -o - %s \
+; RUN:   | FileCheck %s --check-prefix=CHECK-FP-ELIM
+
+; RUN: llc -mtriple armv7-unknown-linux-musleabi \
+; RUN:     -disable-fp-elim -filetype=asm -o - %s \
+; RUN:   | FileCheck %s --check-prefix=CHECK-V7-FP
+
+; RUN: llc -mtriple armv7-unknown-linux-musleabi \
+; RUN:     -filetype=asm -o - %s \
+; RUN:   | FileCheck %s --check-prefix=CHECK-V7-FP-ELIM
+
 ; RUN: llc -mtriple arm-unknown-linux-androideabi \
 ; RUN:     -disable-fp-elim -filetype=asm -o - %s \
 ; RUN:   | FileCheck %s --check-prefix=CHECK-FP

test/CodeGen/ARM/fp16.ll

@@ -1,8 +1,10 @@
 ; RUN: llc -mtriple=armv7a--none-eabi < %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-HARDFLOAT-EABI %s
 ; RUN: llc -mtriple=armv7a--none-gnueabi < %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-HARDFLOAT-GNU %s
+; RUN: llc -mtriple=armv7a--none-musleabi < %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-HARDFLOAT-GNU %s
 ; RUN: llc -mtriple=armv8-eabihf < %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-ARMV8 %s
 ; RUN: llc -mtriple=thumbv7m-eabi < %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-SOFTFLOAT-EABI %s
 ; RUN: llc -mtriple=thumbv7m-gnueabi < %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-SOFTFLOAT-GNU %s
+; RUN: llc -mtriple=thumbv7m-musleabi < %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-SOFTFLOAT-GNU %s
 
 ;; +fp16 is special: it has f32->f16 (unlike v7), but not f64->f16 (unlike v8).
 ;; This exposes unsafe-fp-math optimization opportunities; test that.

test/CodeGen/ARM/memfunc.ll

@@ -5,6 +5,8 @@
 ; RUN: llc < %s -mtriple=arm-none-androideabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI --check-prefix=CHECK
 ; RUN: llc < %s -mtriple=arm-none-gnueabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI --check-prefix=CHECK
 ; RUN: llc < %s -mtriple=arm-none-gnueabihf -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI --check-prefix=CHECK
+; RUN: llc < %s -mtriple=arm-none-musleabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI --check-prefix=CHECK
+; RUN: llc < %s -mtriple=arm-none-musleabihf -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI --check-prefix=CHECK
 
 define void @f1(i8* %dest, i8* %src) {
 entry:

unittests/ADT/TripleTest.cpp

@@ -141,6 +141,12 @@ TEST(TripleTest, ParsedIDs) {
   EXPECT_EQ(Triple::UnknownOS, T.getOS());
   EXPECT_EQ(Triple::EABI, T.getEnvironment());
 
+  T = Triple("arm-none-linux-musleabi");
+  EXPECT_EQ(Triple::arm, T.getArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+  EXPECT_EQ(Triple::MuslEABI, T.getEnvironment());
+
   T = Triple("armv6hl-none-linux-gnueabi");
   EXPECT_EQ(Triple::arm, T.getArch());
   EXPECT_EQ(Triple::Linux, T.getOS());