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https://github.com/c64scene-ar/llvm-6502.git
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63dea2c952
This commit adds a new pass that can inject checks before indirect calls to make sure that these calls target known locations. It supports three types of checks and, at compile time, it can take the name of a custom function to call when an indirect call check fails. The default failure function ignores the error and continues. This pass incidentally moves the function JumpInstrTables::transformType from private to public and makes it static (with a new argument that specifies the table type to use); this is so that the CFI code can transform function types at call sites to determine which jump-instruction table to use for the check at that site. Also, this removes support for jumptables in ARM, pending further performance analysis and discussion. Review: http://reviews.llvm.org/D4167 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221708 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
//===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the methods in the TargetOptions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Function.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Target/TargetOptions.h"
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using namespace llvm;
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/// DisableFramePointerElim - This returns true if frame pointer elimination
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/// optimization should be disabled for the given machine function.
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bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
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// Check to see if we should eliminate non-leaf frame pointers and then
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// check to see if we should eliminate all frame pointers.
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if (MF.getFunction()->hasFnAttribute("no-frame-pointer-elim-non-leaf") &&
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!NoFramePointerElim) {
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const MachineFrameInfo *MFI = MF.getFrameInfo();
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return MFI->hasCalls();
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}
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return NoFramePointerElim;
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}
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/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
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/// is specified on the command line. When this flag is off(default), the
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/// code generator is not allowed to generate mad (multiply add) if the
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/// result is "less precise" than doing those operations individually.
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bool TargetOptions::LessPreciseFPMAD() const {
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return UnsafeFPMath || LessPreciseFPMADOption;
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}
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/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
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/// that the rounding mode of the FPU can change from its default.
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bool TargetOptions::HonorSignDependentRoundingFPMath() const {
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return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
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}
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/// getTrapFunctionName - If this returns a non-empty string, this means isel
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/// should lower Intrinsic::trap to a call to the specified function name
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/// instead of an ISD::TRAP node.
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StringRef TargetOptions::getTrapFunctionName() const {
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return TrapFuncName;
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}
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/// getCFIFuncName - If this returns a non-empty string, then it is the name of
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/// the function that gets called on CFI violations in CFI non-enforcing mode
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/// (!TargetOptions::CFIEnforcing).
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StringRef TargetOptions::getCFIFuncName() const {
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return CFIFuncName;
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}
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