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

test/tools/llvm-objdump/macho-mattr-arm.test

@@ -0,0 +1,5 @@
+@ RUN: llvm-mc < %s -triple armv8-apple-darwin10 -mattr=+fp-armv8 -filetype=obj -o - | llvm-objdump -d -m -mattr=+fp-armv8 - | FileCheck %s
+
+vcvtt.f64.f16 d3, s1
+
+@ CHECK: e0 3b b2 ee vcvtt.f64.f16 d3, s1

test/tools/llvm-objdump/macho-mcpu-arm.test

@@ -0,0 +1,10 @@
+@ RUN: llvm-mc < %s -triple thumbv7-apple-darwin -mcpu=cortex-a7 -filetype=obj | llvm-objdump -triple thumbv7-apple-darwin10 -m -d -mcpu=cortex-a7 - | FileCheck %s
+
+.thumb
+.thumb_func _t
+_t:
+sdiv r1, r2, r3
+udiv r1, r2, r3
+
+@ CHECK: 92 fb f3 f1 sdiv r1, r2, r3
+@ CHECK: b2 fb f3 f1 udiv r1, r2, r3

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));

tools/llvm-objdump/llvm-objdump.cpp

@@ -93,6 +93,12 @@ cl::opt<std::string>
 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>
+cl::list<std::string>
-MAttrs("mattr",
+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;

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);