/usr/include/clang/Analysis/Analyses/LiveVariables.h is in libclang-dev 3.0-6ubuntu3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | //===- LiveVariables.h - Live Variable Analysis for Source CFGs -*- C++ --*-//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements Live Variables analysis for source-level CFGs.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIVEVARIABLES_H
#define LLVM_CLANG_LIVEVARIABLES_H
#include "clang/Analysis/AnalysisContext.h"
#include "clang/AST/Decl.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/ImmutableSet.h"
namespace clang {
class CFG;
class CFGBlock;
class Stmt;
class DeclRefExpr;
class SourceManager;
class LiveVariables : public ManagedAnalysis {
public:
class LivenessValues {
public:
llvm::ImmutableSet<const Stmt *> liveStmts;
llvm::ImmutableSet<const VarDecl *> liveDecls;
bool equals(const LivenessValues &V) const;
LivenessValues()
: liveStmts(0), liveDecls(0) {}
LivenessValues(llvm::ImmutableSet<const Stmt *> LiveStmts,
llvm::ImmutableSet<const VarDecl *> LiveDecls)
: liveStmts(LiveStmts), liveDecls(LiveDecls) {}
~LivenessValues() {}
bool isLive(const Stmt *S) const;
bool isLive(const VarDecl *D) const;
friend class LiveVariables;
};
struct Observer {
virtual ~Observer() {}
/// A callback invoked right before invoking the
/// liveness transfer function on the given statement.
virtual void observeStmt(const Stmt *S,
const CFGBlock *currentBlock,
const LivenessValues& V) {}
/// Called when the live variables analysis registers
/// that a variable is killed.
virtual void observerKill(const DeclRefExpr *DR) {}
};
virtual ~LiveVariables();
/// Compute the liveness information for a given CFG.
static LiveVariables *computeLiveness(AnalysisContext &analysisContext,
bool killAtAssign);
/// Return true if a variable is live at the end of a
/// specified block.
bool isLive(const CFGBlock *B, const VarDecl *D);
/// Returns true if a variable is live at the beginning of the
/// the statement. This query only works if liveness information
/// has been recorded at the statement level (see runOnAllBlocks), and
/// only returns liveness information for block-level expressions.
bool isLive(const Stmt *S, const VarDecl *D);
/// Returns true the block-level expression "value" is live
/// before the given block-level expression (see runOnAllBlocks).
bool isLive(const Stmt *Loc, const Stmt *StmtVal);
/// Print to stderr the liveness information associated with
/// each basic block.
void dumpBlockLiveness(const SourceManager& M);
void runOnAllBlocks(Observer &obs);
static LiveVariables *create(AnalysisContext &analysisContext) {
return computeLiveness(analysisContext, true);
}
static const void *getTag();
private:
LiveVariables(void *impl);
void *impl;
};
class RelaxedLiveVariables : public LiveVariables {
public:
static LiveVariables *create(AnalysisContext &analysisContext) {
return computeLiveness(analysisContext, false);
}
static const void *getTag();
};
} // end namespace clang
#endif
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