Add the -mcpu= option to llvm-objdump for use with the disassemblers.

Also make the disassembler created with the Mach-O parser (the -m option)
pick up the Target specific attributes specified with -mattr option.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215032 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 21 insertions, 4 deletions

diff --git a/tools/llvm-objdump/MachODump.cpp b/tools/llvm-objdump/MachODump.cpp
index 808bc9296d8..3ba8b87d400 100644
--- a/tools/llvm-objdump/MachODump.cpp
+++ b/tools/llvm-objdump/MachODump.cpp
@@ -220,13 +220,22 @@ static void DisassembleInputMachO2(StringRef Filename,
   std::unique_ptr<MCInstrAnalysis> InstrAnalysis(
       TheTarget->createMCInstrAnalysis(InstrInfo.get()));
 
+  // Package up features to be passed to target/subtarget
+  std::string FeaturesStr;
+  if (MAttrs.size()) {
+    SubtargetFeatures Features;
+    for (unsigned i = 0; i != MAttrs.size(); ++i)
+      Features.AddFeature(MAttrs[i]);
+    FeaturesStr = Features.getString();
+  }
+
   // Set up disassembler.
   std::unique_ptr<const MCRegisterInfo> MRI(
       TheTarget->createMCRegInfo(TripleName));
   std::unique_ptr<const MCAsmInfo> AsmInfo(
       TheTarget->createMCAsmInfo(*MRI, TripleName));
   std::unique_ptr<const MCSubtargetInfo> STI(
-      TheTarget->createMCSubtargetInfo(TripleName, "", ""));
+      TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
   MCContext Ctx(AsmInfo.get(), MRI.get(), nullptr);
   std::unique_ptr<const MCDisassembler> DisAsm(
     TheTarget->createMCDisassembler(*STI, Ctx));
diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
index 9e9526aa3cc..ebcee3b7f63 100644
--- a/tools/llvm-objdump/llvm-objdump.cpp
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -94,6 +94,12 @@ llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
                                     "see -version for available targets"));
 
 cl::opt<std::string>
+llvm::MCPU("mcpu",
+     cl::desc("Target a specific cpu type (-mcpu=help for details)"),
+     cl::value_desc("cpu-name"),
+     cl::init(""));
+
+cl::opt<std::string>
 llvm::ArchName("arch", cl::desc("Target arch to disassemble for, "
                                 "see -version for available targets"));
 
@@ -107,8 +113,8 @@ static cl::alias
 SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
                       cl::aliasopt(SectionHeaders));
 
-static cl::list<std::string>
-MAttrs("mattr",
+cl::list<std::string>
+llvm::MAttrs("mattr",
   cl::CommaSeparated,
   cl::desc("Target specific attributes"),
   cl::value_desc("a1,+a2,-a3,..."));
@@ -303,7 +309,7 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
   }
 
   std::unique_ptr<const MCSubtargetInfo> STI(
-      TheTarget->createMCSubtargetInfo(TripleName, "", FeaturesStr));
+      TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
   if (!STI) {
     errs() << "error: no subtarget info for target " << TripleName << "\n";
     return;
diff --git a/tools/llvm-objdump/llvm-objdump.h b/tools/llvm-objdump/llvm-objdump.h
index 6d17f0f09fb..00c1b2c00b8 100644
--- a/tools/llvm-objdump/llvm-objdump.h
+++ b/tools/llvm-objdump/llvm-objdump.h
@@ -25,6 +25,8 @@ namespace object {
 
 extern cl::opt<std::string> TripleName;
 extern cl::opt<std::string> ArchName;
+extern cl::opt<std::string> MCPU;
+extern cl::list<std::string> MAttrs;
 
 // Various helper functions.
 bool error(std::error_code ec);