//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Nate Begeman and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
-// This file implements the PPC specific subclass of TargetSubtarget.
+// This file implements the PPC specific subclass of TargetSubtargetInfo.
//
//===----------------------------------------------------------------------===//
#include "PPCSubtarget.h"
#include "PPC.h"
-#include "llvm/Module.h"
-#include "llvm/Support/CommandLine.h"
-#include "PPCGenSubtarget.inc"
-#include <iostream>
+#include "llvm/GlobalValue.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegistry.h"
+#include <cstdlib>
+
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "PPCGenSubtargetInfo.inc"
using namespace llvm;
-PPCTargetEnum llvm::PPCTarget = TargetDefault;
-
-namespace llvm {
- cl::opt<PPCTargetEnum, true>
- PPCTargetArg(cl::desc("Force generation of code for a specific PPC target:"),
- cl::values(
- clEnumValN(TargetAIX, "aix", " Enable AIX codegen"),
- clEnumValN(TargetDarwin,"darwin",
- " Enable Darwin codegen"),
- clEnumValEnd),
- cl::location(PPCTarget), cl::init(TargetDefault));
-}
-
+
#if defined(__APPLE__)
#include <mach/mach.h>
#include <mach/mach_host.h>
#endif
-PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS, bool is64Bit)
- : StackAlignment(16)
- , InstrItins()
+PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &CPU,
+ const std::string &FS, bool is64Bit)
+ : PPCGenSubtargetInfo(TT, CPU, FS)
+ , StackAlignment(16)
+ , DarwinDirective(PPC::DIR_NONE)
, IsGigaProcessor(false)
, Has64BitSupport(false)
, Use64BitRegs(false)
, HasAltivec(false)
, HasFSQRT(false)
, HasSTFIWX(false)
- , IsAIX(false)
- , IsDarwin(false) {
+ , HasLazyResolverStubs(false)
+ , IsJITCodeModel(false)
+ , TargetTriple(TT) {
// Determine default and user specified characteristics
- std::string CPU = "generic";
+ std::string CPUName = CPU;
+ if (CPUName.empty())
+ CPUName = "generic";
#if defined(__APPLE__)
- CPU = GetCurrentPowerPCCPU();
+ if (CPUName == "generic")
+ CPUName = GetCurrentPowerPCCPU();
#endif
// Parse features string.
- ParseSubtargetFeatures(FS, CPU);
+ ParseSubtargetFeatures(CPUName, FS);
+
+ // Initialize scheduling itinerary for the specified CPU.
+ InstrItins = getInstrItineraryForCPU(CPUName);
// If we are generating code for ppc64, verify that options make sense.
if (is64Bit) {
- if (!has64BitSupport()) {
- std::cerr << "PPC: Generation of 64-bit code for a 32-bit processor "
- "requested. Ignoring 32-bit processor feature.\n";
- Has64BitSupport = true;
- // Silently force 64-bit register use on ppc64.
- Use64BitRegs = true;
- }
+ Has64BitSupport = true;
+ // Silently force 64-bit register use on ppc64.
+ Use64BitRegs = true;
}
// If the user requested use of 64-bit regs, but the cpu selected doesn't
- // support it, warn and ignore.
- if (use64BitRegs() && !has64BitSupport()) {
- std::cerr << "PPC: 64-bit registers requested on CPU without support. "
- "Disabling 64-bit register use.\n";
+ // support it, ignore.
+ if (use64BitRegs() && !has64BitSupport())
Use64BitRegs = false;
- }
-
- // Set the boolean corresponding to the current target triple, or the default
- // if one cannot be determined, to true.
- const std::string& TT = M.getTargetTriple();
- if (TT.length() > 5) {
- IsDarwin = TT.find("darwin") != std::string::npos;
- } else if (TT.empty()) {
-#if defined(_POWER)
- IsAIX = true;
-#elif defined(__APPLE__)
- IsDarwin = true;
-#endif
- }
+
+ // Set up darwin-specific properties.
+ if (isDarwin())
+ HasLazyResolverStubs = true;
+}
+
+/// SetJITMode - This is called to inform the subtarget info that we are
+/// producing code for the JIT.
+void PPCSubtarget::SetJITMode() {
+ // JIT mode doesn't want lazy resolver stubs, it knows exactly where
+ // everything is. This matters for PPC64, which codegens in PIC mode without
+ // stubs.
+ HasLazyResolverStubs = false;
+
+ // Calls to external functions need to use indirect calls
+ IsJITCodeModel = true;
+}
+
+
+/// hasLazyResolverStub - Return true if accesses to the specified global have
+/// to go through a dyld lazy resolution stub. This means that an extra load
+/// is required to get the address of the global.
+bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV,
+ const TargetMachine &TM) const {
+ // We never have stubs if HasLazyResolverStubs=false or if in static mode.
+ if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
+ return false;
+ // If symbol visibility is hidden, the extra load is not needed if
+ // the symbol is definitely defined in the current translation unit.
+ bool isDecl = GV->isDeclaration() && !GV->isMaterializable();
+ if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage())
+ return false;
+ return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
+ GV->hasCommonLinkage() || isDecl;
}
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