Vendor import of llvm trunk r238337:vendor/llvm/llvm-trunk-r238337

https://llvm.org/svn/llvm-project/llvm/trunk@238337

1 files changed, 65 insertions, 49 deletions

diff --git a/include/llvm/CodeGen/CommandFlags.h b/include/llvm/CodeGen/CommandFlags.h
index 973c5954f9ad..a1b9b4e566a2 100644
--- a/include/llvm/CodeGen/CommandFlags.h
+++ b/include/llvm/CodeGen/CommandFlags.h
@@ -16,9 +16,12 @@
 #ifndef LLVM_CODEGEN_COMMANDFLAGS_H
 #define LLVM_CODEGEN_COMMANDFLAGS_H
 
+#include "llvm/IR/Module.h"
 #include "llvm/MC/MCTargetOptionsCommandFlags.h"
+#include "llvm//MC/SubtargetFeature.h"
 #include "llvm/Support/CodeGen.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include <string>
@@ -123,11 +126,6 @@ EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
       cl::desc("Force codegen to assume rounding mode can change dynamically"),
       cl::init(false));
 
-cl::opt<bool>
-GenerateSoftFloatCalls("soft-float",
-                    cl::desc("Generate software floating point library calls"),
-                    cl::init(false));
-
 cl::opt<llvm::FloatABI::ABIType>
 FloatABIForCalls("float-abi",
                  cl::desc("Choose float ABI type"),
@@ -207,6 +205,10 @@ FunctionSections("function-sections",
                  cl::desc("Emit functions into separate sections"),
                  cl::init(false));
 
+cl::opt<bool> UniqueSectionNames("unique-section-names",
+                                 cl::desc("Give unique names to every section"),
+                                 cl::init(true));
+
 cl::opt<llvm::JumpTable::JumpTableType>
 JTableType("jump-table-type",
           cl::desc("Choose the type of Jump-Instruction Table for jumptable."),
@@ -222,57 +224,17 @@ JTableType("jump-table-type",
                          "Create one table per unique function type."),
               clEnumValEnd));
 
-cl::opt<bool>
-FCFI("fcfi",
-     cl::desc("Apply forward-edge control-flow integrity"),
-     cl::init(false));
-
-cl::opt<llvm::CFIntegrity>
-CFIType("cfi-type",
-        cl::desc("Choose the type of Control-Flow Integrity check to add"),
-        cl::init(CFIntegrity::Sub),
-        cl::values(
-            clEnumValN(CFIntegrity::Sub, "sub",
-                       "Subtract the pointer from the table base, then mask."),
-            clEnumValN(CFIntegrity::Ror, "ror",
-                       "Use rotate to check the offset from a table base."),
-            clEnumValN(CFIntegrity::Add, "add",
-                       "Mask out the high bits and add to an aligned base."),
-            clEnumValEnd));
-
-cl::opt<bool>
-CFIEnforcing("cfi-enforcing",
-             cl::desc("Enforce CFI or pass the violation to a function."),
-             cl::init(false));
-
-// Note that this option is linked to the cfi-enforcing option above: if
-// cfi-enforcing is set, then the cfi-func-name option is entirely ignored. If
-// cfi-enforcing is false and no cfi-func-name is set, then a default function
-// will be generated that ignores all CFI violations. The expected signature for
-// functions called with CFI violations is
-//
-// void (i8*, i8*)
-//
-// The first pointer is a C string containing the name of the function in which
-// the violation occurs, and the second pointer is the pointer that violated
-// CFI.
-cl::opt<std::string>
-CFIFuncName("cfi-func-name", cl::desc("The name of the CFI function to call"),
-            cl::init(""));
-
 // Common utility function tightly tied to the options listed here. Initializes
 // a TargetOptions object with CodeGen flags and returns it.
 static inline TargetOptions InitTargetOptionsFromCodeGenFlags() {
   TargetOptions Options;
   Options.LessPreciseFPMADOption = EnableFPMAD;
-  Options.NoFramePointerElim = DisableFPElim;
   Options.AllowFPOpFusion = FuseFPOps;
   Options.UnsafeFPMath = EnableUnsafeFPMath;
   Options.NoInfsFPMath = EnableNoInfsFPMath;
   Options.NoNaNsFPMath = EnableNoNaNsFPMath;
   Options.HonorSignDependentRoundingFPMathOption =
       EnableHonorSignDependentRoundingFPMath;
-  Options.UseSoftFloat = GenerateSoftFloatCalls;
   if (FloatABIForCalls != FloatABI::Default)
     Options.FloatABIType = FloatABIForCalls;
   Options.NoZerosInBSS = DontPlaceZerosInBSS;
@@ -284,17 +246,71 @@ static inline TargetOptions InitTargetOptionsFromCodeGenFlags() {
   Options.UseInitArray = !UseCtors;
   Options.DataSections = DataSections;
   Options.FunctionSections = FunctionSections;
+  Options.UniqueSectionNames = UniqueSectionNames;
 
   Options.MCOptions = InitMCTargetOptionsFromFlags();
   Options.JTType = JTableType;
-  Options.FCFI = FCFI;
-  Options.CFIType = CFIType;
-  Options.CFIEnforcing = CFIEnforcing;
-  Options.CFIFuncName = CFIFuncName;
 
   Options.ThreadModel = TMModel;
 
   return Options;
 }
 
+static inline std::string getCPUStr() {
+  // If user asked for the 'native' CPU, autodetect here. If autodection fails,
+  // this will set the CPU to an empty string which tells the target to
+  // pick a basic default.
+  if (MCPU == "native")
+    return sys::getHostCPUName();
+
+  return MCPU;
+}
+
+static inline std::string getFeaturesStr() {
+  SubtargetFeatures Features;
+
+  // If user asked for the 'native' CPU, we need to autodetect features.
+  // This is necessary for x86 where the CPU might not support all the
+  // features the autodetected CPU name lists in the target. For example,
+  // not all Sandybridge processors support AVX.
+  if (MCPU == "native") {
+    StringMap<bool> HostFeatures;
+    if (sys::getHostCPUFeatures(HostFeatures))
+      for (auto &F : HostFeatures)
+        Features.AddFeature(F.first(), F.second);
+  }
+
+  for (unsigned i = 0; i != MAttrs.size(); ++i)
+    Features.AddFeature(MAttrs[i]);
+
+  return Features.getString();
+}
+
+/// \brief Set function attributes of functions in Module M based on CPU,
+/// Features, and command line flags.
+static inline void setFunctionAttributes(StringRef CPU, StringRef Features,
+                                         Module &M) {
+  for (auto &F : M) {
+    auto &Ctx = F.getContext();
+    AttributeSet Attrs = F.getAttributes(), NewAttrs;
+
+    if (!CPU.empty())
+      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
+                                       "target-cpu", CPU);
+
+    if (!Features.empty())
+      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
+                                       "target-features", Features);
+
+    if (DisableFPElim.getNumOccurrences() > 0)
+      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
+                                       "no-frame-pointer-elim",
+                                       DisableFPElim ? "true" : "false");
+
+    // Let NewAttrs override Attrs.
+    NewAttrs = Attrs.addAttributes(Ctx, AttributeSet::FunctionIndex, NewAttrs);
+    F.setAttributes(NewAttrs);
+  }
+}
+
 #endif