Using ARMTargetParser in Clang

[rengolin]

Summary

This is a starting point for using the TargetParser in Clang, in a simple
enough part of the code that can be used without disrupting the crazy
platform support that we need to be compatible with other toolchains.

Also adding a few FIXME on obvious places that need replacing, but those
cases will indeed break a few of the platform assumptions, as arch/cpu names
change multiple times in the driver.

Finally, I'm changing the "neon-vfpv3" behaviour to match standard NEON, since
-mfpu=neon implies vfpv3 by default in both Clang and LLVM. That option
string is still supported as an alias to "neon".

This patch depends on D9435 for support in LLVM.

[rengolin]

Removing unnecessary "clang" match in tests, since it's only one command line per execution.

[rengolin]

Rename ARMTargetParser.h/cpp to TargetParser.h/cpp

[rnk]

lgtm

[rengolin]

Thanks! r236901.

lib/Driver/ToolChains.cpp

bool Darwin::hasBlocksRuntime() const {
   if (isTargetIOSBased())
     return !isIPhoneOSVersionLT(3, 2);
   else {
     assert(isTargetMacOS() && "unexpected darwin target");
     return !isMacosxVersionLT(10, 6);
   }
 }
 
+// FIXME: Use ARMTargetParser.
 static const char *GetArmArchForMArch(StringRef Value) {
   return llvm::StringSwitch<const char*>(Value)
     .Case("armv6k", "armv6")
     .Case("armv6m", "armv6m")
     .Case("armv5tej", "armv5")
     .Case("xscale", "xscale")
     .Case("armv4t", "armv4t")
     .Case("armv7", "armv7")
     .Cases("armv7a", "armv7-a", "armv7")
     .Cases("armv7r", "armv7-r", "armv7")
     .Cases("armv7em", "armv7e-m", "armv7em")
     .Cases("armv7k", "armv7-k", "armv7k")
     .Cases("armv7m", "armv7-m", "armv7m")
     .Cases("armv7s", "armv7-s", "armv7s")
     .Default(nullptr);
 }
 
+// FIXME: Use ARMTargetParser.
 static const char *GetArmArchForMCpu(StringRef Value) {
   return llvm::StringSwitch<const char *>(Value)
     .Cases("arm9e", "arm946e-s", "arm966e-s", "arm968e-s", "arm926ej-s","armv5")
     .Cases("arm10e", "arm10tdmi", "armv5")
     .Cases("arm1020t", "arm1020e", "arm1022e", "arm1026ej-s", "armv5")
     .Case("xscale", "xscale")
     .Cases("arm1136j-s", "arm1136jf-s", "arm1176jz-s", "arm1176jzf-s", "armv6")
     .Cases("sc000", "cortex-m0", "cortex-m0plus", "cortex-m1", "armv6m")

lib/Driver/Tools.cpp

 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/Option.h"
+#include "llvm/Support/ARMTargetParser.h"
 #include "llvm/Support/Compression.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/raw_ostream.h"

 //
 // FIXME: Centralize feature selection, defaulting shouldn't be also in the
 // frontend target.
 static void getARMFPUFeatures(const Driver &D, const Arg *A,
                               const ArgList &Args,
                               std::vector<const char *> &Features) {
   StringRef FPU = A->getValue();
 
-  // Set the target features based on the FPU.
-  if (FPU == "fpa" || FPU == "fpe2" || FPU == "fpe3" || FPU == "maverick") {
-    // Disable any default FPU support.
+  // FIXME: Why does "none" disable more than "invalid"?
+  if (FPU == "none") {
+    Features.push_back("-vfp2");
+    Features.push_back("-vfp3");
+    Features.push_back("-vfp4");
+    Features.push_back("-fp-armv8");
+    Features.push_back("-crypto");
+    Features.push_back("-neon");
+    return;
+  }
+
+  // FIXME: Make sure we differentiate sp-only.
+  if (FPU.find("-sp-") != StringRef::npos) {
+    Features.push_back("+fp-only-sp");
+  }
+
+  // All other FPU types, valid or invalid.
+  switch(llvm::ARMTargetParser::parseFPU(FPU)) {
+  case llvm::ARM::INVALID_FPU:
+  case llvm::ARM::SOFTVFP:
     Features.push_back("-vfp2");
     Features.push_back("-vfp3");
     Features.push_back("-neon");
-  } else if (FPU == "vfp") {
+    break;
+  case llvm::ARM::VFP:
+  case llvm::ARM::VFPV2:
     Features.push_back("+vfp2");
     Features.push_back("-neon");
-  } else if (FPU == "vfp3-d16" || FPU == "vfpv3-d16") {
-    Features.push_back("+vfp3");
+    break;
+  case llvm::ARM::VFPV3_D16:
     Features.push_back("+d16");
-    Features.push_back("-neon");
-  } else if (FPU == "vfp3" || FPU == "vfpv3") {
+    // fall-through
+  case llvm::ARM::VFPV3:
     Features.push_back("+vfp3");
     Features.push_back("-neon");
-  } else if (FPU == "vfp4-d16" || FPU == "vfpv4-d16") {
-    Features.push_back("+vfp4");
+    break;
+  case llvm::ARM::VFPV4_D16:
     Features.push_back("+d16");
-    Features.push_back("-neon");
-  } else if (FPU == "vfp4" || FPU == "vfpv4") {
-    Features.push_back("+vfp4");
-    Features.push_back("-neon");
-  } else if (FPU == "fp4-sp-d16" || FPU == "fpv4-sp-d16") {
+    // fall-through
+  case llvm::ARM::VFPV4:
     Features.push_back("+vfp4");
-    Features.push_back("+d16");
-    Features.push_back("+fp-only-sp");
-    Features.push_back("-neon");
-  } else if (FPU == "fp5-sp-d16" || FPU == "fpv5-sp-d16") {
-    Features.push_back("+fp-armv8");
-    Features.push_back("+fp-only-sp");
-    Features.push_back("+d16");
     Features.push_back("-neon");
-    Features.push_back("-crypto");
-  } else if (FPU == "fp5-dp-d16" || FPU == "fpv5-dp-d16" ||
-             FPU == "fp5-d16" || FPU == "fpv5-d16") {
-    Features.push_back("+fp-armv8");
+    break;
+  case llvm::ARM::FPV5_D16:
     Features.push_back("+d16");
-    Features.push_back("-neon");
-    Features.push_back("-crypto");
-  } else if (FPU == "fp-armv8") {
+    // fall-through
+  case llvm::ARM::FP_ARMV8:
     Features.push_back("+fp-armv8");
     Features.push_back("-neon");
     Features.push_back("-crypto");
-  } else if (FPU == "neon-fp-armv8") {
+    break;
+  case llvm::ARM::NEON_FP_ARMV8:
     Features.push_back("+fp-armv8");
     Features.push_back("+neon");
     Features.push_back("-crypto");
-  } else if (FPU == "crypto-neon-fp-armv8") {
+    break;
+  case llvm::ARM::CRYPTO_NEON_FP_ARMV8:
     Features.push_back("+fp-armv8");
     Features.push_back("+neon");
     Features.push_back("+crypto");
-  } else if (FPU == "neon") {
-    Features.push_back("+neon");
-  } else if (FPU == "neon-vfpv3") {
-    Features.push_back("+vfp3");
+    break;
+  case llvm::ARM::NEON:
     Features.push_back("+neon");
-  } else if (FPU == "neon-vfpv4") {
+    break;
+  case llvm::ARM::NEON_VFPV4:
     Features.push_back("+neon");
     Features.push_back("+vfp4");
-  } else if (FPU == "none") {
-    Features.push_back("-vfp2");
-    Features.push_back("-vfp3");
-    Features.push_back("-vfp4");
-    Features.push_back("-fp-armv8");
-    Features.push_back("-crypto");
-    Features.push_back("-neon");
-  } else
+    break;
+  default:
     D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
+  }
 }
 
 // Select the float ABI as determined by -msoft-float, -mhard-float, and
 // -mfloat-abi=.
 StringRef tools::arm::getARMFloatABI(const Driver &D, const ArgList &Args,
                                      const llvm::Triple &Triple) {
   StringRef FloatABI;
   if (Arg *A = Args.getLastArg(options::OPT_msoft_float,

   return getARMCPUForMArch(Args, Triple);
 }
 
 /// getLLVMArchSuffixForARM - Get the LLVM arch name to use for a particular
 /// CPU.
 //
 // FIXME: This is redundant with -mcpu, why does LLVM use this.
 // FIXME: tblgen this, or kill it!
+// FIXME: Use ARMTargetParser.
 const char *arm::getLLVMArchSuffixForARM(StringRef CPU) {
   return llvm::StringSwitch<const char *>(CPU)
     .Case("strongarm", "v4")
     .Cases("arm7tdmi", "arm7tdmi-s", "arm710t", "v4t")
     .Cases("arm720t", "arm9", "arm9tdmi", "v4t")
     .Cases("arm920", "arm920t", "arm922t", "v4t")
     .Cases("arm940t", "ep9312","v4t")
     .Cases("arm10tdmi",  "arm1020t", "v5")

test/Driver/arm-mfpu.c

 // RUN:   | FileCheck --check-prefix=CHECK-VFP3 %s
 // CHECK-VFP3: "-target-feature" "+vfp3"
 // CHECK-VFP3: "-target-feature" "-neon"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=vfp3-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-VFP3-D16 %s
 // RUN: %clang -target arm-linux-eabi -mfpu=vfpv3-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-VFP3-D16 %s
-// CHECK-VFP3-D16: "-target-feature" "+vfp3"
 // CHECK-VFP3-D16: "-target-feature" "+d16"
+// CHECK-VFP3-D16: "-target-feature" "+vfp3"
 // CHECK-VFP3-D16: "-target-feature" "-neon"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=vfp4 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-VFP4 %s
 // RUN: %clang -target arm-linux-eabi -mfpu=vfpv4 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-VFP4 %s
 // CHECK-VFP4: "-target-feature" "+vfp4"
 // CHECK-VFP4: "-target-feature" "-neon"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=vfp4-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-VFP4-D16 %s
 // RUN: %clang -target arm-linux-eabi -mfpu=vfpv4-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-VFP4-D16 %s
-// CHECK-VFP4-D16: "-target-feature" "+vfp4"
 // CHECK-VFP4-D16: "-target-feature" "+d16"
+// CHECK-VFP4-D16: "-target-feature" "+vfp4"
 // CHECK-VFP4-D16: "-target-feature" "-neon"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=fp4-sp-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-FP4-SP-D16 %s
 // RUN: %clang -target arm-linux-eabi -mfpu=fpv4-sp-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-FP4-SP-D16 %s
-// CHECK-FP4-SP-D16: "-target-feature" "+vfp4"
-// CHECK-FP4-SP-D16: "-target-feature" "+d16"
 // CHECK-FP4-SP-D16: "-target-feature" "+fp-only-sp"
+// CHECK-FP4-SP-D16: "-target-feature" "+d16"
+// CHECK-FP4-SP-D16: "-target-feature" "+vfp4"
 // CHECK-FP4-SP-D16: "-target-feature" "-neon"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=fp5-sp-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-FP5-SP-D16 %s
 // RUN: %clang -target arm-linux-eabi -mfpu=fpv5-sp-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-FP5-SP-D16 %s
-// CHECK-FP5-SP-D16: "-target-feature" "+fp-armv8"
 // CHECK-FP5-SP-D16: "-target-feature" "+fp-only-sp"
 // CHECK-FP5-SP-D16: "-target-feature" "+d16"
+// CHECK-FP5-SP-D16: "-target-feature" "+fp-armv8"
 // CHECK-FP5-SP-D16: "-target-feature" "-neon"
 // CHECK-FP5-SP-D16: "-target-feature" "-crypto"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=fp5-dp-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-FP5-DP-D16 %s
 // RUN: %clang -target arm-linux-eabi -mfpu=fpv5-dp-d16 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-FP5-DP-D16 %s
-// CHECK-FP5-DP-D16: "-target-feature" "+fp-armv8"
 // CHECK-FP5-DP-D16: "-target-feature" "+d16"
+// CHECK-FP5-DP-D16: "-target-feature" "+fp-armv8"
 // CHECK-FP5-DP-D16: "-target-feature" "-neon"
 // CHECK-FP5-DP-D16: "-target-feature" "-crypto"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=neon %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NEON %s
 // CHECK-NEON: "-target-feature" "+neon"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=neon-vfpv3 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NEON-VFPV3 %s
-// CHECK-NEON-VFPV3: "-target-feature" "+vfp3"
 // CHECK-NEON-VFPV3: "-target-feature" "+neon"
 
 // RUN: %clang -target arm-linux-eabi -mfpu=neon-vfpv4 %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NEON-VFPV4 %s
 // CHECK-NEON-VFPV4: "-target-feature" "+neon"
 // CHECK-NEON-VFPV4: "-target-feature" "+vfp4"
 
 // RUN: %clang -target arm-linux-eabi -msoft-float %s -### -o %t.o 2>&1 \