Description
Base class for machine instructions.
- Each instruction is represented by one or more instances of SgAsmInstruction.
- An instruction obtained from a full AST will have a parent pointer. The instruction's first ancestor of type SgAsmBlock is the basic block in which the instruction appears, and its first ancestor of type SgAsmFunction is the function in which the instruction appears. There may be intervening AST nodes having other types.
- An instruction obtained from a Partitioner will not have a parent pointer. You can find ownership information using the Partitioner API.
- An instruction's bytes will always be contiguous in the virtual address space from which the instruction was decoded, but might not be contiguous in the file (if any) where the instruction was stored. In fact, there's no guarantee that the instruction even exists entirely within one file.
- Two distinct instructions (with different encodings) can start at the same virtual address if the specimen is self-modifying. Most ROSE analysis assumes that specimens are not self-modifying and uses the instruction's starting virtual address to uniquely identify the instruction.
- Two distinct instructions (with different encodings) can occupy overlapping bytes in the virtual address space, and are guaranteed to have different starting addresses unless the specimen is self-modifying.
Definition at line 1068 of file binaryInstruction.C.
Public Member Functions | |
| virtual std::string | description () const |
| Return a description of this instruction. More... | |
| void | appendSources (SgAsmInstruction *instruction) |
| size_t | nOperands () const |
| Number of operands. More... | |
| SgAsmExpression * | operand (size_t) const |
| Nth operand. More... | |
| virtual bool | terminatesBasicBlock () |
| Determines if this instruction normally terminates a basic block. More... | |
| bool | isFirstInBlock () |
| Returns true if this instruction is the first instruction in a basic block. More... | |
| bool | isLastInBlock () |
| Returns true if this instruction is the last instruction in a basic block. More... | |
| virtual Sawyer::Optional< rose_addr_t > | branchTarget () |
| Obtains the virtual address for a branching instruction. More... | |
| bool | getBranchTarget (rose_addr_t *target) ROSE_DEPRECATED("use branchTarget instead") |
| virtual bool | hasEffect () |
| Determines whether a single instruction has an effect. More... | |
| virtual bool | hasEffect (const std::vector< SgAsmInstruction * > &, bool allow_branch=false, bool relax_stack_semantics=false) |
| Determine if an instruction sequence has an effect. More... | |
| virtual std::vector< std::pair< size_t, size_t > > | findNoopSubsequences (const std::vector< SgAsmInstruction * > &insns, bool allow_branch=false, bool relax_stack_semantics=false) |
| Determines what subsequences of an instruction sequence have no cumulative effect. More... | |
| virtual Rose::BinaryAnalysis::AddressSet | getSuccessors (bool &complete) |
| Control flow successors for a single instruction. More... | |
| virtual Rose::BinaryAnalysis::AddressSet | getSuccessors (const std::vector< SgAsmInstruction * > &basicBlock, bool &complete, const Rose::BinaryAnalysis::MemoryMap::Ptr &initial_memory=Rose::BinaryAnalysis::MemoryMap::Ptr()) |
| Control flow successors for a basic block. More... | |
| virtual size_t | get_size () const |
| Returns the size of an instruction in bytes. More... | |
| virtual bool | isUnknown () const |
| Returns true if this instruction is the special "unknown" instruction. More... | |
| virtual unsigned | get_anyKind () const |
| Returns instruction kind for any architecture. More... | |
| virtual std::string | toString () const |
| Converts the instruction to a string. More... | |
| virtual std::set< rose_addr_t > | explicitConstants () const |
| Explicit constants. More... | |
| bool | normalizeOperands () |
| Rewrite certain addressing modes for operands. More... | |
| const std::string & | get_mnemonic () const |
| Property: Instruction mnemonic string. More... | |
| void | set_mnemonic (const std::string &) |
| Property: Instruction mnemonic string. More... | |
| const SgUnsignedList & | get_raw_bytes () const |
| Property: Raw bytes of an instruction. More... | |
| void | set_raw_bytes (const SgUnsignedList &) |
| Property: Raw bytes of an instruction. More... | |
| SgAsmOperandList * | get_operandList () const |
| Property: AST node that holds all operands. More... | |
| void | set_operandList (SgAsmOperandList *) |
| Property: AST node that holds all operands. More... | |
| int64_t | get_stackDeltaIn () const |
| Property: Stack pointer at start of instruction relative to start of instruction's function. More... | |
| void | set_stackDeltaIn (int64_t) |
| Property: Stack pointer at start of instruction relative to start of instruction's function. More... | |
| SgAsmExprListExp * | get_semantics () const |
| Property: Ordered list of instruction semantics. More... | |
| void | set_semantics (SgAsmExprListExp *) |
| Property: Ordered list of instruction semantics. More... | |
| virtual bool | isFunctionCallFast (const std::vector< SgAsmInstruction * > &, rose_addr_t *target, rose_addr_t *ret) |
| Returns true if the specified basic block looks like a function call. More... | |
| virtual bool | isFunctionCallSlow (const std::vector< SgAsmInstruction * > &, rose_addr_t *target, rose_addr_t *ret) |
| Returns true if the specified basic block looks like a function call. More... | |
| virtual bool | isFunctionReturnFast (const std::vector< SgAsmInstruction * > &) |
| Returns true if the specified basic block looks like a function return. More... | |
| virtual bool | isFunctionReturnSlow (const std::vector< SgAsmInstruction * > &) |
| Returns true if the specified basic block looks like a function return. More... | |
| size_t | semanticFailure () const |
| Property: Whether instruction semantics failed at this location. More... | |
| void | semanticFailure (size_t) |
| Property: Whether instruction semantics failed at this location. More... | |
| void | incrementSemanticFailure () |
| Property: Whether instruction semantics failed at this location. More... | |
| size_t | cacheLockCount () const |
| Property: Cache lock count. More... | |
| void | adjustCacheLockCount (int increment) |
| Property: Cache lock count. More... | |
 Public Member Functions inherited from SgAsmStatement | |
| rose_addr_t | get_address () const |
| Property: Starting virtual address. More... | |
| void | set_address (rose_addr_t) |
| Property: Starting virtual address. More... | |
| const std::string & | get_comment () const |
| Property: Commentary. | |
| void | set_comment (const std::string &) |
| Property: Commentary. | |
| Public Member Functions inherited from SgNode | |
| virtual SgNode * | copy (SgCopyHelp &help) const |
| This function clones the current IR node object recursively or not, depending on the argument. More... | |
| virtual std::string | class_name () const |
| returns a string representing the class name More... | |
| virtual VariantT | variantT () const |
| returns new style SageIII enum values More... | |
| void * | operator new (size_t size) |
| returns pointer to newly allocated IR node | |
| void | operator delete (void *pointer, size_t size) |
| deallocated memory for IR node (returns memory to memory pool for reuse) | |
| void | operator delete (void *pointer) |
| virtual std::vector< SgNode * > | get_traversalSuccessorContainer () |
| container of pointers to AST successor nodes used in the traversal overridden in every class by generated implementation More... | |
| virtual std::vector< std::string > | get_traversalSuccessorNamesContainer () |
| container of names of variables or container indices used used in the traversal to access AST successor nodes overridden in every class by generated implementation More... | |
| virtual size_t | get_numberOfTraversalSuccessors () |
| return number of children in the traversal successor list | |
| virtual SgNode * | get_traversalSuccessorByIndex (size_t idx) |
| index-based access to traversal successors by index number | |
| virtual size_t | get_childIndex (SgNode *child) |
| index-based access to traversal successors by child node | |
| virtual RTIReturnType | roseRTI () |
| return C++ Runtime-Time-Information More... | |
| virtual const char * | sage_class_name () const ROSE_DEPRECATED_FUNCTION |
| generates string representing the class name: (e.g. for SgNode returns "SgNode"). More... | |
| void | executeVisitorMemberFunction (ROSE_VisitorPattern &visitor) |
| FOR INTERNAL USE Support for visitor pattern. | |
| virtual void | accept (ROSE_VisitorPattern &visitor) |
| support for the classic visitor pattern done in GoF | |
| virtual bool | isInMemoryPool () |
| FOR INTERNAL USE This is used in internal tests to verify that all IR nodes are allocated from the heap. More... | |
| virtual void | checkDataMemberPointersIfInMemoryPool () |
| FOR INTERNAL USE This is used in internal tests to verify that all IR nodes are allocated from the heap. More... | |
| virtual std::vector< std::pair< SgNode *, std::string > > | returnDataMemberPointers () const |
| FOR INTERNAL USE Returns STL vector of pairs of SgNode* and strings for use in AST tools More... | |
| virtual void | processDataMemberReferenceToPointers (ReferenceToPointerHandler *) |
| FOR INTERNAL USE Processes pairs of references to SgNode* and strings for use in AST tools More... | |
| virtual long | getChildIndex (SgNode *childNode) const |
| FOR INTERNAL USE Returns a unique index value for the childNode in the list of children at this IR node. More... | |
| SgNode (const SgNodeStorageClass &source) | |
| IR node constructor to support AST File I/O. | |
| SgNode * | addRegExpAttribute (std::string s, AstRegExAttribute *a) |
| Support for AST matching using regular expression. More... | |
| void | set_isModified (bool isModified) |
| All nodes in the AST contain a isModified flag used to track changes to the AST. More... | |
| void | set_containsTransformation (bool containsTransformation) |
| Many nodes can hide other AST nodes and we need to track when outer nodes contain modified nodes even if they are not themselves modified. More... | |
| bool | get_isModified () const |
| Acess function for isModified flag. More... | |
| bool | get_containsTransformation () const |
| Acess function for containsTransformation flag. More... | |
| void | set_parent (SgNode *parent) |
| All nodes in the AST contain a reference to a parent node. More... | |
| SgNode * | get_parent () const |
| Access function for parent node. More... | |
| bool | isChild (SgNode *node) const |
| Query function for if the input IR nodes is a child of the current IR node. | |
| virtual std::string | unparseToString (SgUnparse_Info *info) const |
| This function unparses the AST node (excluding comments and unnecessary white space) | |
| std::string | unparseToString () const |
| std::string | unparseToCompleteString () |
| This function unparses the AST node (including comments and white space) More... | |
| int | variant () const ROSE_DEPRECATED_FUNCTION |
| Older version function returns enum value "NODE". More... | |
| virtual void | addNewAttribute (std::string s, AstAttribute *a) |
| Add a new attribute represented by the named string. | |
| virtual AstAttribute * | getAttribute (std::string s) const |
| Returns attribute of name 's'. | |
| virtual void | updateAttribute (std::string s, AstAttribute *a) |
| Replace existing attribute of name 's' with new AstAttribute. | |
| virtual void | setAttribute (std::string s, AstAttribute *a) |
| This is a wrapper function with the following semantics: if no attribute of name 's' exists then addNewAttribute(s,a); is called, otherwise updateAttribute(s,a); is called. | |
| virtual void | removeAttribute (std::string s) |
| Remove attribute of name 's' if present. | |
| virtual bool | attributeExists (std::string s) const |
| Tests if attribute of name 's' is present. | |
| virtual int | numberOfAttributes () const |
| Returns the number of attributes on this IR node. | |
| virtual AstAttributeMechanism * | get_attributeMechanism () const |
| FOR INTERNAL USE Access function; if an attribute exists then a pointer to it is returned, else error. More... | |
| virtual void | set_attributeMechanism (AstAttributeMechanism *a) |
| FOR INTERNAL USE Access function; sets poiner to value AstAttributeMechanism. More... | |
| virtual void | fixupCopy (SgNode *copy, SgCopyHelp &help) const |
| virtual Sg_File_Info * | get_file_info (void) const |
| File information containing filename, line number, column number, and if the SgNode is a part of a new transformation, etc. | |
| virtual Sg_File_Info * | get_startOfConstruct (void) const |
| New function interface for Sg_File_Info data stores starting location of contruct (typically the opening brace or first letter of keyword). | |
| virtual Sg_File_Info * | get_endOfConstruct (void) const |
| New function interface for Sg_File_Info data stores ending location of contruct (typically the closing brace). | |
| VirtualCFG::CFGNode | cfgForBeginning () |
| Returns the CFG node for just before this AST node. | |
| VirtualCFG::CFGNode | cfgForEnd () |
| Returns the CFG node for just after this AST node. | |
| virtual unsigned int | cfgIndexForEnd () const |
| Determine the CFG index for the end of this construct. | |
| virtual bool | cfgIsIndexInteresting (unsigned int index) const |
| Determine whether a particular CFG node index is "interesting" for this kind of node. | |
| virtual unsigned int | cfgFindChildIndex (SgNode *n) |
| Find the index of n in this node's CFG children. | |
| virtual unsigned int | cfgFindNextChildIndex (SgNode *n) |
| Find the index just after n in this node's CFG children. | |
| virtual std::vector< VirtualCFG::CFGEdge > | cfgOutEdges (unsigned int index=false) |
| Find the out edges of a CFG node – internal version. | |
| virtual std::vector< VirtualCFG::CFGEdge > | cfgInEdges (unsigned int index=false) |
| Find the in edges of a CFG node – internal version. | |
| int | numberOfNodesInSubtree () |
| Computes the number of nodes in the defined subtree of the AST. More... | |
| int | depthOfSubtree () |
| Computes the depth of the current defined subtree of the AST. More... | |
| SgNode * | get_freepointer () const |
| void | set_freepointer (SgNode *freepointer) |
| virtual | ~SgNode () |
| This is the destructor. More... | |
| SgNode () | |
| This is the constructor. More... | |
| bool | get_isVisited () const ROSE_DEPRECATED_FUNCTION |
| DOCS IN HEADER: Access function for p_isVisited flag used previously by the AST traversals. More... | |
| void | set_isVisited (bool isVisited) ROSE_DEPRECATED_FUNCTION |
| Access function for p_isVisited flag used previously by the AST traversals. More... | |
Static Public Attributes | |
| static const int64_t | INVALID_STACK_DELTA |
| Represents an invalid stack delta. More... | |
Additional Inherited Members | |
| Public Types inherited from SgNode | |
| enum | { static_variant = V_SgNode } |
| static variant value | |
| Static Public Member Functions inherited from SgNode | |
| static void | deleteMemoryPool () |
| static size_t | numberOfNodes () |
| Returns the total number of IR nodes of this type. | |
| static size_t | memoryUsage () |
| Returns the size in bytes of the total memory allocated for all IR nodes of this type. | |
| static void | traverseMemoryPoolNodes (ROSE_VisitTraversal &visit) |
| FOR INTERNAL USE Support for visitor pattern over all IR nodes by type of IR node. | |
| static void | traverseMemoryPoolVisitorPattern (ROSE_VisitorPattern &visitor) |
| FOR INTERNAL USE Support for visitor pattern. | |
| static void | visitRepresentativeNode (ROSE_VisitTraversal &visit) |
| FOR INTERNAL USE Support for type-based traversal. | |
| static SgNode * | getNodeByNodeId (VariantT variantT, size_t poolIdx, size_t itemIdx) |
| Find a node by its variant type, pool index, and item index. | |
| static SgNode * | getNodeByNodeIdInternal (size_t poolIdx, size_t itemIdx) |
| FOR INTERNAL USE Find an SgNode from its memory pool and location therin. | |
| static std::string | getNodeIdString (SgNode *sgnode) |
| compute the NodeId for a particular SgNode*. | |
| static std::string | getNodeIdStringInternal (SgNode *sgnode) |
| static std::vector< std::string > | buildCommandLineToSubstituteTransformationFile (const std::vector< std::string > &argv, std::string newFileName) |
| Command line support for this compilation The command line is saved as a static variable so that it will be available to support the rewrite mechanism. More... | |
| static std::vector< VariantT > | getClassHierarchySubTreeFunction (VariantT v) |
| static void | getClassHierarchySubTreeFunction (VariantT v, std::vector< VariantT > &) |
| static std::map< SgNode *, std::string > & | get_globalMangledNameMap () |
| Access function for performance optimizing global mangled name map. More... | |
| static void | clearGlobalMangledNameMap () |
| Support to clear the performance optimizing global mangled name map. | |
| static std::map< std::string, int > & | get_shortMangledNameCache () |
| Access function for lower level optimizing of global mangled name map. More... | |
| static std::map< SgNode *, std::string > & | get_globalQualifiedNameMapForNames () |
| Access function for name qualification support (for names). More... | |
| static void | set_globalQualifiedNameMapForNames (const std::map< SgNode *, std::string > &X) |
| Access function for name qualification support (for names). More... | |
| static std::map< SgNode *, std::string > & | get_globalQualifiedNameMapForTypes () |
| Access function for name qualification support (for type). More... | |
| static void | set_globalQualifiedNameMapForTypes (const std::map< SgNode *, std::string > &X) |
| Access function for name qualification support (for type). More... | |
| static std::map< SgNode *, std::map< SgNode *, std::string > > & | get_globalQualifiedNameMapForMapsOfTypes () |
| Access function for name qualification support (for maps of types). More... | |
| static void | set_globalQualifiedNameMapForMapsOfTypes (const std::map< SgNode *, std::map< SgNode *, std::string > > &X) |
| Access function for name qualification support (for maps of types). More... | |
| static std::map< SgNode *, std::string > & | get_globalQualifiedNameMapForTemplateHeaders () |
| Access function for name qualification support (for template headers in template declarations). More... | |
| static void | set_globalQualifiedNameMapForTemplateHeaders (const std::map< SgNode *, std::string > &X) |
| Access function for name qualification support (for template headers in template declarations). More... | |
| static std::map< SgNode *, std::string > & | get_globalTypeNameMap () |
| Access function for name qualification support (for names of types). More... | |
| static void | set_globalTypeNameMap (const std::map< SgNode *, std::string > &X) |
| Access function for name qualification support (for names of types). More... | |
| static SgFunctionTypeTable * | get_globalFunctionTypeTable () |
| Access function for symbol table specific to function types. | |
| static void | set_globalFunctionTypeTable (SgFunctionTypeTable *globalFunctionTypeTable) |
| Access function for symbol table specific to function types. | |
| static SgTypeTable * | get_globalTypeTable () |
| Access function for symbol table specific to non-function types. | |
| static void | set_globalTypeTable (SgTypeTable *globalTypeTable) |
| Access function for symbol table specific to non-function types. | |
| static VariantT | variantFromPool (SgNode const *n) |
| Protected Member Functions inherited from SgNode | |
| virtual void | post_construction_initialization () |
| Final initialization for constructors This function is called at the end of generated constructors to allow the specification writer to add special initialization functions or tests. Default is to do nothing. Otherwise it should be overridden in the spec file, in NewHeaderCode/NewOutlinedCode. | |
| Protected Attributes inherited from SgNode | |
| SgNode * | p_parent |
| This is the pointer to the parent IR node in the AST. More... | |
| bool | p_isModified |
| Records if IR node has been modified (data members reset). More... | |
| bool | p_containsTransformation |
| SgNode * | p_freepointer |
| This is the pointer to the chain of previously freed objects. | |
| Static Protected Attributes inherited from SgNode | |
| static std::vector< std::tuple< unsigned char *, unsigned, VariantT > > | all_pools |
| static SgFunctionTypeTable * | p_globalFunctionTypeTable |
| Pointer to symbol table specific to function types. | |
| static SgTypeTable * | p_globalTypeTable |
| static std::map< SgNode *, std::string > | p_globalMangledNameMap |
| Cache of mangled names to avoid regeneration of previously build mangled names or parts of mangled names. This is a performance optimization. | |
| static std::map< std::string, int > | p_shortMangledNameCache |
| STL map used as a cache to shorten generated mangled names. This is mostly a space optimization ofr mangled names of templates. | |
| static std::map< SgNode *, std::string > | p_globalQualifiedNameMapForNames |
| static std::map< SgNode *, std::string > | p_globalQualifiedNameMapForTypes |
| static std::map< SgNode *, std::string > | p_globalQualifiedNameMapForTemplateHeaders |
| static std::map< SgNode *, std::string > | p_globalTypeNameMap |
| static std::map< SgNode *, std::map< SgNode *, std::string > > | p_globalQualifiedNameMapForMapsOfTypes |
Member Function Documentation
| const std::string& SgAsmInstruction::get_mnemonic | ( | ) | const |
Property: Instruction mnemonic string.
The short string that describes the instruction. When comparing instructions, it's faster to use the get_kind or get_anyKind methods instead of comparing mnemonic strings. But be aware that some architectures have mnemonics that include information about the instruction operands and this information is typically not represented by the instruction kind enum constants.
| void SgAsmInstruction::set_mnemonic | ( | const std::string & | ) |
Property: Instruction mnemonic string.
The short string that describes the instruction. When comparing instructions, it's faster to use the get_kind or get_anyKind methods instead of comparing mnemonic strings. But be aware that some architectures have mnemonics that include information about the instruction operands and this information is typically not represented by the instruction kind enum constants.
| const SgUnsignedList& SgAsmInstruction::get_raw_bytes | ( | ) | const |
Property: Raw bytes of an instruction.
These are the bytes that were actually decoded to obtain the instruction AST.
| void SgAsmInstruction::set_raw_bytes | ( | const SgUnsignedList & | ) |
Property: Raw bytes of an instruction.
These are the bytes that were actually decoded to obtain the instruction AST.
| SgAsmOperandList* SgAsmInstruction::get_operandList | ( | ) | const |
Property: AST node that holds all operands.
This is the SgAsmOperandList AST node that holds all the operands of this instruction. A separate node is necessary (rather than storing the operand list directly in the instruction node) due to limitations of ROSETTA.
| void SgAsmInstruction::set_operandList | ( | SgAsmOperandList * | ) |
Property: AST node that holds all operands.
This is the SgAsmOperandList AST node that holds all the operands of this instruction. A separate node is necessary (rather than storing the operand list directly in the instruction node) due to limitations of ROSETTA.
| int64_t SgAsmInstruction::get_stackDeltaIn | ( | ) | const |
Property: Stack pointer at start of instruction relative to start of instruction's function.
If the stack delta was not computed, or could not be computed, or is a non-numeric value then the special value INVALID_STACK_DELTA is used.
| void SgAsmInstruction::set_stackDeltaIn | ( | int64_t | ) |
Property: Stack pointer at start of instruction relative to start of instruction's function.
If the stack delta was not computed, or could not be computed, or is a non-numeric value then the special value INVALID_STACK_DELTA is used.
| SgAsmExprListExp* SgAsmInstruction::get_semantics | ( | ) | const |
Property: Ordered list of instruction semantics.
If instruction semantics are available and attached to the instruction, then this subtree will contain a list of semantic side effects of the instruction. The semantics are attached by using the Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics semantic domain.
| void SgAsmInstruction::set_semantics | ( | SgAsmExprListExp * | ) |
Property: Ordered list of instruction semantics.
If instruction semantics are available and attached to the instruction, then this subtree will contain a list of semantic side effects of the instruction. The semantics are attached by using the Rose::BinaryAnalysis::InstructionSemantics::StaticSemantics semantic domain.
|
inlinevirtual |
Return a description of this instruction.
Descriptions are useful for generating comments in the disassembly listing to say what each instruction does when the audience is not well versed in that instruction set architecture. The base implementation always returns an empty string.
Reimplemented in SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, and SgAsmPowerpcInstruction.
Definition at line 1216 of file binaryInstruction.C.
| size_t SgAsmInstruction::nOperands | ( | ) | const |
Number of operands.
| SgAsmExpression* SgAsmInstruction::operand | ( | size_t | ) | const |
Nth operand.
If the operand index is out of range, then null is returned.
|
virtual |
Determines if this instruction normally terminates a basic block.
The analysis only looks at the individual instruction and therefore is not very sophisticated. For instance, a conditional branch will always terminate a basic block by this method even if its condition is opaque. The base class implementation always aborts; architecture-specific subclasses should override this to do something useful (pure virtual is not possible due to ROSETTA).
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
|
virtual |
Returns true if the specified basic block looks like a function call.
This instruction object is only used to select the appropriate virtual method; the basic block to be analyzed is the first argument to the function. If the basic block looks like a function call then this method returns true. If (and only if) the target address is known (i.e., the address of the called function) then target is set to this address (otherwise target is unmodified). If the return address is known or can be guessed, then return_va is initialized to the return address, which is normally the fall-through address of the last instruction; otherwise the return_va is unmodified.
The "fast" and "slow" versions differ only in what kind of anlysis they do. The "fast" version typically looks only at instruction patterns while the slow version might incur more expense by looking at instruction semantics.
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
|
virtual |
Returns true if the specified basic block looks like a function call.
This instruction object is only used to select the appropriate virtual method; the basic block to be analyzed is the first argument to the function. If the basic block looks like a function call then this method returns true. If (and only if) the target address is known (i.e., the address of the called function) then target is set to this address (otherwise target is unmodified). If the return address is known or can be guessed, then return_va is initialized to the return address, which is normally the fall-through address of the last instruction; otherwise the return_va is unmodified.
The "fast" and "slow" versions differ only in what kind of anlysis they do. The "fast" version typically looks only at instruction patterns while the slow version might incur more expense by looking at instruction semantics.
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
|
virtual |
Returns true if the specified basic block looks like a function return.
This instruction object is only used to select the appropriate virtual method; the basic block to be analyzed is the first argument to the function.
The "fast" and "slow" versions differ only in what kind of anlysis they do. The "fast" version typically looks only at instruction patterns while the slow version might incur more expense by looking at instruction semantics.
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
|
virtual |
Returns true if the specified basic block looks like a function return.
This instruction object is only used to select the appropriate virtual method; the basic block to be analyzed is the first argument to the function.
The "fast" and "slow" versions differ only in what kind of anlysis they do. The "fast" version typically looks only at instruction patterns while the slow version might incur more expense by looking at instruction semantics.
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
| bool SgAsmInstruction::isFirstInBlock | ( | ) |
Returns true if this instruction is the first instruction in a basic block.
This method looks only at the AST to make this determination.
| bool SgAsmInstruction::isLastInBlock | ( | ) |
Returns true if this instruction is the last instruction in a basic block.
This method looks only at the AST to make this determination.
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virtual |
Obtains the virtual address for a branching instruction.
Returns the branch target address if this instruction is a branching instruction and the target is known; otherwise returns nothing.
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, and SgAsmX86Instruction.
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virtual |
Determines whether a single instruction has an effect.
An instruction has an effect if it does anything other than setting the instruction pointer to a concrete value. Instructions that have no effect are called "no-ops". The x86 NOP instruction is an example of a no-op, but there are others also.
The following information about x86 no-ops is largely from Cory Cohen at CMU/SEI. In the discussion that follows, we are careful to distinguish between NOP (the mneumonic for instructions 90, and 0f1f) and "no-op" (any instruction whose only effect is to advance the instruction pointer).
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Determine if an instruction sequence has an effect.
A sequence of instructions has an effect if it does something other than setting the instruction pointer to a concrete value.
This is mostly a wrapper around the NoOperation analysis. The allow_branch and relax_stack_semantics are no longer supported but perhaps will be added eventually to the NoOperation analysis.
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virtual |
Determines what subsequences of an instruction sequence have no cumulative effect.
The return value is a vector of pairs where each pair is the starting index and length of subsequence. The algorithm we use is to compute the machine state after each instruction and then look for pairs of states that are identical except for the instruction pointer.
This is mostly a wrapper around the NoOperation analysis. The allow_branch and relax_stack_semantics are no longer supported but perhaps will be added eventually to the NoOperation analysis.
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virtual |
Control flow successors for a single instruction.
The return value does not consider neighboring instructions, and therefore is quite naive. It returns only the information it can glean from this single instruction. If the returned set of virtual instructions is fully known then the complete argument will be set to true, otherwise false. The base class implementation always aborts()–it must be defined in an architecture-specific subclass (pure virtual is not possible due to ROSETTA).
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
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Control flow successors for a basic block.
The basicBlock argument is a vector of instructions that is assumed to be a basic block that is entered only at the first instruction and exits only at the last instruction. A memory map can supply initial values for the analysis' memory state. The return value is a set of control flow successor virtual addresses, and the complete argument return value indicates whether the returned set is known to be complete (aside from interrupts, faults, etc). The base class implementation just calls the single-instruction version, so architecture-specific subclasses might want to override this to do something more sophisticated.
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmCilInstruction, and SgAsmX86Instruction.
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Returns the size of an instruction in bytes.
This is only a convenience function that returns the size of the instruction's raw byte vector. If an instruction or its arguments are modified, then the size returned by this function might not reflect the true size of the modified instruction if it were to be reassembled.
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Returns true if this instruction is the special "unknown" instruction.
Each instruction architecture in ROSE defines an "unknown" instruction to be used when the disassembler is unable to create a real instruction. This can happen, for instance, if the bit pattern does not represent a valid instruction for the architecture.
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
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Returns instruction kind for any architecture.
Instruction kinds are specific to the architecture so it doesn't make sense to compare an instruction kind from x86 with an instruction kind from m68k. However, this virtual function exists so that we don't need to implement switch statements every time we want to compare two instructions from the same architecture. For instance, instead of code like this:
we can write future-proof code:
Reimplemented in SgAsmNullInstruction, SgAsmM68kInstruction, SgAsmMipsInstruction, SgAsmJvmInstruction, SgAsmCilInstruction, SgAsmPowerpcInstruction, and SgAsmX86Instruction.
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virtual |
Converts the instruction to a string.
The return value is an address, colon, mnemonic, and arguments. Only one space is used between the parts.
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virtual |
Explicit constants.
Return the set of integer constants that appear explicitly in the instruction's operands. These are called "immediates" for some architectures such as X86.
| size_t SgAsmInstruction::semanticFailure | ( | ) | const |
Property: Whether instruction semantics failed at this location.
This property is incremented by various analyses that evaluate instructions semantically when semantics fails in a way that is not recoverable. Some analyses can work around failed semantics by operating in a degraded mode, and it is up to the analysis whether to increment this property.
Thread safety: This method is thread safe.
| void SgAsmInstruction::semanticFailure | ( | size_t | ) |
Property: Whether instruction semantics failed at this location.
This property is incremented by various analyses that evaluate instructions semantically when semantics fails in a way that is not recoverable. Some analyses can work around failed semantics by operating in a degraded mode, and it is up to the analysis whether to increment this property.
Thread safety: This method is thread safe.
| void SgAsmInstruction::incrementSemanticFailure | ( | ) |
Property: Whether instruction semantics failed at this location.
This property is incremented by various analyses that evaluate instructions semantically when semantics fails in a way that is not recoverable. Some analyses can work around failed semantics by operating in a degraded mode, and it is up to the analysis whether to increment this property.
Thread safety: This method is thread safe.
| size_t SgAsmInstruction::cacheLockCount | ( | ) | const |
Property: Cache lock count.
Number of locks held on this object, preventing the AST rooted at this node from being evicted from a cache.
Thread safety: This method is thread safe.
| void SgAsmInstruction::adjustCacheLockCount | ( | int | increment | ) |
Property: Cache lock count.
Number of locks held on this object, preventing the AST rooted at this node from being evicted from a cache.
Thread safety: This method is thread safe.
| bool SgAsmInstruction::normalizeOperands | ( | ) |
Rewrite certain addressing modes for operands.
The addressing mode: REG1 + REG2 * SIZE + OFFSET is changed from (+ (+ REG1 (* REG2 SIZE)) OFFSET) to (+ (+ REG1 OFFSET) (* REG2 SIZE)), which during instruction semantic executions causes the base register and offset to be added first to obtain the starting address of an array, and then an additional offset added to obtain the address of the desired element of that array.
Returns true if anything changed, false otherwise.
Member Data Documentation
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Represents an invalid stack delta.
This value is used for the result of a stack delta analysis stored in the instruction AST if the stack delta analysis was not run or did not produce a numeric result.
Definition at line 1209 of file binaryInstruction.C.
The documentation for this class was generated from the following file:
