ghidra::ContextBitRange Class Reference

Description of a context variable within the disassembly context blob. More...

#include <globalcontext.hh>

Public Member Functions
	ContextBitRange (void)
	Construct an undefined bit range.
	ContextBitRange (int4 sbit, int4 ebit)
	Construct a context value given an absolute bit range. More...
int4	getShift (void) const
	Return the shift-amount for this value.
uintm	getMask (void) const
	Return the mask for this value.
int4	getWord (void) const
	Return the word index for this value.
void	setValue (uintm *vec, uintm val) const
	Set this value within a given context blob. More...
uintm	getValue (const uintm *vec) const
	Retrieve this value from a given context blob. More...

Private Attributes
int4	word
	Index of word containing this context value.
int4	startbit
	Starting bit of the value within its word (0=most significant bit 1=least significant)
int4	endbit
	Ending bit of the value within its word.
int4	shift
	Right-shift amount to apply when unpacking this value from its word.
uintm	mask
	Mask to apply (after shifting) when unpacking this value from its word.

Detailed Description

Description of a context variable within the disassembly context blob.

Disassembly context is stored as individual (integer) values packed into a sequence of words. This class represents the info for encoding or decoding a single value within this sequence. A value is a contiguous range of bits within one context word. Size can range from 1 bit up to the size of a word.

Constructor & Destructor Documentation

ContextBitRange()

ghidra::ContextBitRange::ContextBitRange	(	int4	sbit,
		int4	ebit
	)

Construct a context value given an absolute bit range.

Bits within the whole context blob are labeled starting with 0 as the most significant bit in the first word in the sequence. The new context value must be contained within a single word.

Parameters

sbit	is the starting (most significant) bit of the new value
ebit	is the ending (least significant) bit of the new value

References endbit, mask, shift, startbit, and word.

Member Function Documentation

getValue()

uintm ghidra::ContextBitRange::getValue ( const uintm *  vec ) const

inline

Retrieve this value from a given context blob.

Parameters

vec	is the given context blob (as an array of uintm words)

Returns

the recovered integer value

Referenced by ghidra::ContextDatabase::getDefaultValue(), and ghidra::ContextDatabase::getVariable().

setValue()

void ghidra::ContextBitRange::setValue ( uintm *  vec, uintm  val  ) const

inline

Set this value within a given context blob.

Parameters

vec	is the given context blob to alter (as an array of uintm words)
val	is the integer value to set

References mask, shift, and word.

Referenced by ghidra::ContextInternal::decodeContext(), ghidra::ContextDatabase::setVariable(), ghidra::ContextDatabase::setVariableDefault(), and ghidra::ContextDatabase::setVariableRegion().

---

The documentation for this class was generated from the following files:

• globalcontext.hh
• globalcontext.cc