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Code Issues Releases Wiki Activity

More robust Symbol support for HighVariable

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This commit is contained in:
caheckman 2019-12-12 16:53:53 -05:00
parent b99772a784
commit cdbee3fe39
11 changed files with 268 additions and 174 deletions
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32
Ghidra/Features/Decompiler/src/decompile/cpp/variable.hh
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@ -46,11 +46,13 @@ public:
flagsdirty = 1, ///< Boolean properties for the HighVariable are dirty
typedirty = 2, ///< The data-type for the HighVariable is dirty
coverdirty = 4, ///< The cover for the HighVariable is dirty
symboldirty = 8, ///< The symbol attachment is dirty
copy_in1 = 8, ///< There exists at least 1 COPY into \b this HighVariable from other HighVariables
copy_in2 = 16, ///< There exists at least 2 COPYs into \b this HighVariable from other HighVariables
type_finalized = 32 ///< Set if a final data-type is locked in and dirtying is disabled
};
private:
friend class Varnode;
friend class Merge;
vector<Varnode *> inst; ///< The member Varnode objects making up \b this HighVariable
int4 numMergeClasses; ///< Number of different speculative merge classes in \b this
@ -64,34 +66,26 @@ private:
void updateFlags(void) const; ///< (Re)derive boolean properties of \b this from the member Varnodes
void updateCover(void) const; ///< (Re)derive the cover of \b this from the member Varnodes
void updateType(void) const; ///< (Re)derive the data-type for \b this from the member Varnodes
void updateSymbol(void) const; ///< (Re)derive the Symbol and offset for \b this from member Varnodes
void setCopyIn1(void) const { highflags |= copy_in1; } ///< Mark the existence of one COPY into \b this
void setCopyIn2(void) const { highflags |= copy_in2; } ///< Mark the existence of two COPYs into \b this
void clearCopyIns(void) const { highflags &= ~(copy_in1 | copy_in2); } ///< Clear marks indicating COPYs into \b this
bool hasCopyIn1(void) const { return ((highflags&copy_in1)!=0); } ///< Is there at least one COPY into \b this
bool hasCopyIn2(void) const { return ((highflags&copy_in2)!=0); } ///< Is there at least two COPYs into \b this
void remove(Varnode *vn); ///< Remove a member Varnode from \b this
void merge(HighVariable *tv2,bool isspeculative); ///< Merge another HighVariable into \b this
public:
HighVariable(Varnode *vn); ///< Construct a HighVariable with a single member Varnode
Datatype *getType(void) const { updateType(); return type; } ///< Get the data-type
/// \brief Set the Symbol associated with \b this HighVariable.
///
/// This HighVariable does not need to be associated with the whole symbol. It can be associated with
/// a part, like a sub-field, if the size of the member Varnodes and the Symbol don't match. In this case
/// a non-zero offset may be passed in with the Symbol to indicate what part is represented by the \b this.
/// \param sym is the Symbol to associate with \b this
/// \param off is the offset in bytes, relative to the Symbol, where \b this HighVariable starts
void setSymbol(Symbol *sym,int4 off) const {
symbol = sym; symboloffset = off; }
Symbol *getSymbol(void) const { return symbol; } ///< Get the Symbol associated with \b this
int4 getSymbolOffset(void) const { return symboloffset; } ///< Get the Symbol offset associated with \b this
int4 numInstances(void) const { return inst.size(); } ///< Get the number of member Varnodes \b this has
Varnode *getInstance(int4 i) const { return inst[i]; } ///< Get the i-th member Varnode
void setSymbol(Varnode *vn) const; ///< Update Symbol information for \b this from the given member Varnode
void setSymbolReference(Symbol *sym,int4 off); ///< Attach a reference to a Symbol to \b this
void flagsDirty(void) const { highflags |= HighVariable::flagsdirty; } ///< Mark the boolean properties as \e dirty
void coverDirty(void) const { highflags |= HighVariable::coverdirty; } ///< Mark the cover as \e dirty
void typeDirty(void) const { highflags |= HighVariable::typedirty; } ///< Mark the data-type as \e dirty
void remove(Varnode *vn); ///< Remove a member Varnode from \b this
public:
HighVariable(Varnode *vn); ///< Construct a HighVariable with a single member Varnode
Datatype *getType(void) const { updateType(); return type; } ///< Get the data-type
Symbol *getSymbol(void) const { updateSymbol(); return symbol; } ///< Get the Symbol associated with \b this
int4 getSymbolOffset(void) const { return symboloffset; } ///< Get the Symbol offset associated with \b this
int4 numInstances(void) const { return inst.size(); } ///< Get the number of member Varnodes \b this has
Varnode *getInstance(int4 i) const { return inst[i]; } ///< Get the i-th member Varnode
void finalizeDatatype(Datatype *tp); ///< Set a final datatype for \b this variable
/// \brief Print details of the cover for \b this (for debug purposes)