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1991e2a4df
Summary: This instruction encodes a loading operation that may fault, and a label to branch to if the load page-faults. The locations of potentially faulting loads and their "handler" destinations are recorded in a FaultMap section, meant to be consumed by LLVM's clients. Nothing generates FAULTING_LOAD_OP instructions yet, but they will be used in a future change. The documentation (FaultMaps.rst) needs improvement and I will update this diff with a more expanded version shortly. Depends on D10196 Reviewers: rnk, reames, AndyAyers, ab, atrick, pgavlin Reviewed By: atrick, pgavlin Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10197 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239740 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
//===------------------- FaultMaps.h - StackMaps ----------------*- C++ -*-===//
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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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#ifndef LLVM_CODEGEN_FAULTMAPS_H
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#define LLVM_CODEGEN_FAULTMAPS_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/MC/MCSymbol.h"
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#include <vector>
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#include <map>
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namespace llvm {
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class AsmPrinter;
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class MCExpr;
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class MCSymbol;
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class MCStreamer;
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class FaultMaps {
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public:
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enum FaultType { FaultingLoad = 1, FaultTypeMax };
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static const char *faultTypeToString(FaultType);
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explicit FaultMaps(AsmPrinter &AP);
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void recordFaultingOp(FaultType FaultTy, const MCSymbol *HandlerLabel);
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void serializeToFaultMapSection();
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private:
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static const char *WFMP;
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struct FaultInfo {
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FaultType FaultType;
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const MCExpr *FaultingOffsetExpr;
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const MCExpr *HandlerOffsetExpr;
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FaultInfo()
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: FaultType(FaultTypeMax), FaultingOffsetExpr(nullptr),
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HandlerOffsetExpr(nullptr) {}
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explicit FaultInfo(FaultMaps::FaultType FType, const MCExpr *FaultingOffset,
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const MCExpr *HandlerOffset)
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: FaultType(FType), FaultingOffsetExpr(FaultingOffset),
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HandlerOffsetExpr(HandlerOffset) {}
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};
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typedef std::vector<FaultInfo> FunctionFaultInfos;
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// We'd like to keep a stable iteration order for FunctionInfos to help
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// FileCheck based testing.
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struct MCSymbolComparator {
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bool operator()(const MCSymbol *LHS, const MCSymbol *RHS) const {
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return LHS->getName() < RHS->getName();
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}
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};
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std::map<const MCSymbol *, FunctionFaultInfos, MCSymbolComparator>
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FunctionInfos;
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AsmPrinter &AP;
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void emitFunctionInfo(const MCSymbol *FnLabel, const FunctionFaultInfos &FFI);
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};
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}
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#endif
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