//
//===----------------------------------------------------------------------===//
+#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalAlias.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/GlobalVariable.h"
#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/MC/MCCodeGenInfo.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
//
namespace llvm {
- bool StrongPHIElim;
bool HasDivModLibcall;
bool AsmVerbosityDefault(false);
}
FunctionSections("ffunction-sections",
cl::desc("Emit functions into separate sections"),
cl::init(false));
-
+
//---------------------------------------------------------------------------
// TargetMachine Class
//
delete AsmInfo;
}
+/// \brief Reset the target options based on the function's attributes.
+void TargetMachine::resetTargetOptions(const MachineFunction *MF) const {
+ const Function *F = MF->getFunction();
+ TargetOptions &TO = MF->getTarget().Options;
+
+#define RESET_OPTION(X, Y) \
+ do { \
+ if (F->hasFnAttribute(Y)) \
+ TO.X = \
+ (F->getAttributes(). \
+ getAttribute(AttributeSet::FunctionIndex, \
+ Y).getValueAsString() == "true"); \
+ } while (0)
+
+ RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim");
+ RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad");
+ RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
+ RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
+ RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
+ RESET_OPTION(UseSoftFloat, "use-soft-float");
+ RESET_OPTION(DisableTailCalls, "disable-tail-calls");
+}
+
/// getRelocationModel - Returns the code generation relocation model. The
/// choices are static, PIC, and dynamic-no-pic, and target default.
Reloc::Model TargetMachine::getRelocationModel() const {
return CodeGenInfo->getCodeModel();
}
+/// Get the IR-specified TLS model for Var.
+static TLSModel::Model getSelectedTLSModel(const GlobalVariable *Var) {
+ switch (Var->getThreadLocalMode()) {
+ case GlobalVariable::NotThreadLocal:
+ llvm_unreachable("getSelectedTLSModel for non-TLS variable");
+ break;
+ case GlobalVariable::GeneralDynamicTLSModel:
+ return TLSModel::GeneralDynamic;
+ case GlobalVariable::LocalDynamicTLSModel:
+ return TLSModel::LocalDynamic;
+ case GlobalVariable::InitialExecTLSModel:
+ return TLSModel::InitialExec;
+ case GlobalVariable::LocalExecTLSModel:
+ return TLSModel::LocalExec;
+ }
+ llvm_unreachable("invalid TLS model");
+}
+
+TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
+ // If GV is an alias then use the aliasee for determining
+ // thread-localness.
+ if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
+ GV = GA->resolveAliasedGlobal(false);
+ const GlobalVariable *Var = cast<GlobalVariable>(GV);
+
+ bool isLocal = Var->hasLocalLinkage();
+ bool isDeclaration = Var->isDeclaration();
+ bool isPIC = getRelocationModel() == Reloc::PIC_;
+ bool isPIE = Options.PositionIndependentExecutable;
+ // FIXME: what should we do for protected and internal visibility?
+ // For variables, is internal different from hidden?
+ bool isHidden = Var->hasHiddenVisibility();
+
+ TLSModel::Model Model;
+ if (isPIC && !isPIE) {
+ if (isLocal || isHidden)
+ Model = TLSModel::LocalDynamic;
+ else
+ Model = TLSModel::GeneralDynamic;
+ } else {
+ if (!isDeclaration || isHidden)
+ Model = TLSModel::LocalExec;
+ else
+ Model = TLSModel::InitialExec;
+ }
+
+ // If the user specified a more specific model, use that.
+ TLSModel::Model SelectedModel = getSelectedTLSModel(Var);
+ if (SelectedModel > Model)
+ return SelectedModel;
+
+ return Model;
+}
+
/// getOptLevel - Returns the optimization level: None, Less,
/// Default, or Aggressive.
CodeGenOpt::Level TargetMachine::getOptLevel() const {
void TargetMachine::setDataSections(bool V) {
DataSections = V;
}
-
-/// DisableFramePointerElim - This returns true if frame pointer elimination
-/// optimization should be disabled for the given machine function.
-bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
- // Check to see if we should eliminate non-leaf frame pointers and then
- // check to see if we should eliminate all frame pointers.
- if (NoFramePointerElimNonLeaf && !NoFramePointerElim) {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- return MFI->hasCalls();
- }
-
- return NoFramePointerElim;
-}
-
-/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
-/// is specified on the command line. When this flag is off(default), the
-/// code generator is not allowed to generate mad (multiply add) if the
-/// result is "less precise" than doing those operations individually.
-bool TargetOptions::LessPreciseFPMAD() const {
- return UnsafeFPMath || LessPreciseFPMADOption;
-}
-
-/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
-/// that the rounding mode of the FPU can change from its default.
-bool TargetOptions::HonorSignDependentRoundingFPMath() const {
- return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
-}
-
-/// getTrapFunctionName - If this returns a non-empty string, this means isel
-/// should lower Intrinsic::trap to a call to the specified function name
-/// instead of an ISD::TRAP node.
-StringRef TargetOptions::getTrapFunctionName() const {
- return TrapFuncName;
-}
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