CN108762920A - The determination of wild pointer and localization method in a kind of Dram - Google Patents
The determination of wild pointer and localization method in a kind of Dram Download PDFInfo
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- CN108762920A CN108762920A CN201810480467.9A CN201810480467A CN108762920A CN 108762920 A CN108762920 A CN 108762920A CN 201810480467 A CN201810480467 A CN 201810480467A CN 108762920 A CN108762920 A CN 108762920A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
- G06F9/5022—Mechanisms to release resources
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
- G06F9/5016—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals the resource being the memory
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Abstract
The present invention provides a kind of determination of wild pointer in Dram and localization methods, it will not be used using the Dram normal condition being released, that is the data of each subelement deposit of Dram are will not be changed, if changing, there are wild pointers in read-me.In addition, holding the wild pointer with the changed relevant function in subelement address of the data in operating before；If operation or function have multiple, the corresponding function of multiple operation or multiple function are likely to hold the wild pointer, and the multiple function of screening or the function of multiple operations, then can position wild pointer one by one.
Description
Technical field
The present invention relates to a kind of determination of wild pointer in Dram technical field more particularly to Dram and positioning sides
Method.
Background technology
When C or C Plus Plus develop program, most flexible part will count pointer.The mistake caused by pointer can be brought
It is unexpected as a result, cause various Dram problems, solve time-consuming and laborious.
It is difficult to positioning pointer mistake, is not because pointer itself is wrong, but the address that these pointers are directed toward is not just
Really, such as wild pointer or null pointer.When being written and read access for Dram by fingers of these mistakes, the data meeting read
Incorrect, the data of write-in can cause the internal storage data of other modules to be destroyed, and system crash is caused when serious.
In view of this, in Dram the determination of wild pointer and localization method it is really necessary to.
Invention content
The goal of the invention of the present invention is to provide the determination of wild pointer and localization method in a kind of Dram, using being released
The Dram normal condition put will not be used, i.e. the data of each subelement deposit of Dram are will not to change
, if changing, there are wild pointers in read-me.In addition, before operate in the changed subelement of the data
The relevant function in address holds the wild pointer；If operation or function have multiple, the corresponding function or multiple of multiple operation
Function is likely to hold the wild pointer, and the multiple function of screening or the function of multiple operations, then can position wild pointer one by one.
To achieve the above object, the present invention provides a kind of determination method of wild pointer in Dram, including：
According to the Memory Allocation request distribution Dram in program, and the Memory Allocation solicited message under normal allocation is protected
It deposits；
After the Dram for discharging the distribution, predetermined number is written in each subelement of the Dram discharged
According to；
When the Dram discharged described in sub-distribution again, the data and phase in each subelement of the Dram are first checked
Answer the tentation data of subelement whether consistent；If existing, one or more subelements are inconsistent, and there are open countries to refer in described program
Wild pointer is not present if each subelement is all consistent in needle in described program.
Optionally, it is described according to Memory Allocation ask distribution Dram when Dram whether can normal allocation judgement
Method is：Before distribution, check that corresponding subelement is deposited when the data in each subelement of Dram are initialized to the Dram
Whether the data entered are consistent；If each subelement is all consistent, the Dram can normal allocation, if there are one or more sons
Unit is inconsistent, then the Dram can not normal allocation.
Optionally, the Memory Allocation solicited message of the preservation includes：Each subelement address of Dram is relevant
The filename of program file or described program file where function and the function.
Optionally, the Memory Allocation solicited message of the preservation further includes：Each subelement address of Dram is related
Function row residing in described program file line number.
Optionally, it after the Dram for discharging the distribution, is also allocated, the cycle of release dynamics memory at least one
It is secondary, it checks whether the data in each subelement of the Dram are consistent with the tentation data of corresponding subelement and is assigned as again
The Dram of the distribution release after last time cycle；It corresponds in subelement and is written in the Dram discharged every time
Tentation data it is identical；
It is described distribution, release dynamics memory cycle include：
According to the Memory Allocation request distribution Dram in program, and the Memory Allocation solicited message under normal allocation is protected
It deposits；
After the Dram for discharging the distribution, predetermined number is written in each subelement of the Dram discharged
According to.
Optionally, when the release dynamics memory, dynamic memory deallocation history table is also created, the Dram is released
History table is put to be used for：Every time when the Dram of release distribution, deposit previous step preserves interior when distributing Dram
Deposit assignment request information.
The present invention also provides a kind of localization methods of wild pointer in Dram, including：
The determination method of wild pointer according to any one of aforementioned 1 to 4, if there are wild pointer in program, according to
The address of its interior data and the inconsistent one or more subelements of pre-stored data, it is right in the Memory Allocation solicited message to search
Should one or more subelement addresses function, the function of wild pointer is held with positioning.
The present invention additionally provides a kind of localization methods of wild pointer in Dram, including：
The determination method of wild pointer according to aforementioned 5, if there are wild pointers in program, according to its interior data and in advance
The address of the inconsistent one or more subelements of deposit data, the Memory Allocation request letter of each secondary dynamic memory distribution of screening
The function that the one or more subelement address is corresponded in breath holds the function of wild pointer with positioning.
The present invention provides a kind of localization method of wild pointer in Dram again, including：
The determination method of wild pointer according to aforementioned 6, if there are wild pointers in program, according to its interior data and in advance
The dynamic memory deallocation history table, each table of screening are searched in the address of the inconsistent one or more subelements of deposit data
The function that the one or more subelement address is corresponded in the Memory Allocation solicited message of item holds wild pointer with positioning
Function.
Optionally, gradually each list item of screening when, closer to last time release dynamics memory, more first screening.
Compared with prior art, the beneficial effects of the present invention are：
It in the present invention, will not be used using the Dram normal condition being released, i.e. each son of Dram
The data of unit deposit are will not be changed, if changing, there are wild pointers in read-me.In addition, grasping before
Hold the wild pointer with the changed relevant function in subelement address of the data in work；If operation or function have it is multiple,
The corresponding function of multiple operation or multiple function are likely to hold the wild pointer, one by one screening multiple function or multiple
The function of operation can then position wild pointer.
Description of the drawings
Fig. 1 is the flow chart of the determination method of wild pointer in the Dram in one embodiment of the invention；
Fig. 2 is the result schematic diagram of Dram initialization before the step S1 distribution Drams in Fig. 1；
Fig. 3 is the structural schematic diagram of the Dram after being assigned；
Fig. 4 is that the result schematic diagram after tentation data is written in each subelement of the Dram discharged；
Fig. 5 is the flow chart of the localization method of wild pointer in the Dram in one embodiment of the invention；
Fig. 6 is the flow chart of the determination method of wild pointer in the Dram in another embodiment of the present invention；
Fig. 7 is the result schematic diagram of the dynamic memory deallocation history table of each secondary release dynamics memory；
Fig. 8 is the flow chart of the localization method of wild pointer in the Dram in another embodiment of the present invention.
Specific implementation mode
To make the above purposes, features and advantages of the invention more obvious and understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Fig. 1 is the flow chart of the determination method of wild pointer in the Dram in one embodiment of the invention.
Each step is introduced individually below.
Shown in referring to Fig.1, step S1 is first carried out, according to the Memory Allocation request distribution Dram in program, and will just
Often the Memory Allocation solicited message under distribution preserves.
In one scheme, Dram is the Dram in embedded OS programming, such as FreeRTOS operations
System, but the present invention is not intended to limit this, any operating system is related to dynamic memory distribution, discharges this applicable hair when programming
Bright wild pointer determination and localization method.
In one scheme, Dram is heap memory.Heap memory is be different from stack area, global data area and code area another
One region of memory.Heap permission program applies for the memory headroom of some size dynamically at runtime.
Dram before dispensing, is first initialized.Fig. 2 is before the step S1 in Fig. 1 distributes Dram, in dynamic
Deposit the result schematic diagram of initialization.With reference to shown in Fig. 2, initialization refers to that a data are written in all free memories, the number
According to for example, " 0XAA ".One piece of memory information recording areas is also opened in Fig. 2, in Dram, for recording in corresponding dynamic
The relevant information deposited, what this step was recorded is Dram size, i.e., the size that each subelement takes up space altogether.
Later, according to the Memory Allocation request distribution Dram in program.Memory Allocation request can correspond in program
A function.
This step S1 will first check whether Dram can normal allocation in Memory Allocation.Specifically, judgment method
For：Check the data that corresponding subelement is stored in when being initialized to the Dram of the data in each subelement of Dram whether one
It causes；If each subelement is all consistent, Dram can normal allocation, if it is inconsistent to there are one or more subelements, dynamic
Memory can not normal allocation.
If when distribution, the storage result of Dram is as shown in Fig. 2, the data in each subelement are " 0XAA ", with this
The data of Dram corresponding subelement deposit when initializing are consistent, illustrate that the Dram can be normally allocated away.
If the data existed in one or more subelements are not " 0XAA ", illustrate one or more subelement place
Dram can not normal allocation.
Fig. 3 is the structural schematic diagram of the Dram after being assigned.With reference to shown in Fig. 3, after Dram is assigned, also exist
The Dram interblock of corresponding Dram preserves Memory Allocation solicited message.
In one scheme, the Memory Allocation solicited message of preservation includes：Each subelement address phase of assigned Dram
The filename of program file or program file where the function of pass and the function.
In another scheme, the Memory Allocation solicited message of preservation further includes：Each subelement of assigned Dram
The line number of the relevant function in location row residing in program file.
The Memory Allocation solicited message of preservation is more detailed, when occurring wild pointer in a program, is more conducive to quickly position and be somebody's turn to do
Wild pointer.
Then step S2 is executed, after discharging distributed Dram, in each subelement of the Dram discharged
Interior write-in tentation data.
Dram can be according to program using needs, in case dispensing use again after release.
Fig. 4 is that the result schematic diagram after tentation data is written in each subelement of the Dram discharged.Reference
Shown in Fig. 4, tentation data can be identical as each data of subelement write-in when internal memory initialization, is " 0XAA ".Further, since releasing
When putting, the Memory Allocation solicited message of memory information recording areas record is corresponded to the size of memory and is covered, thus, it is discharging
Before, it needs first to copy the Memory Allocation solicited message that Dram interblock records to come, such as create a Dram
History table is discharged, Memory Allocation solicited message is stored in it.Certainly, Dram interblock can also be opened up
In the region for being not required to release, in such cases, it is not required to replicate the content of Dram interblock record again.
It should be noted that dynamic memory deallocation history table can also together be established when Dram initializes.
Followed by step S3 is executed, when distributing discharged Dram again, each subelement of Dram is first checked
In data it is whether consistent with the tentation data of corresponding subelement；If it is inconsistent to there are one or more subelements, in program
There are wild pointers, if each subelement is all consistent, wild pointer is not present.
The Dram normal condition being released will not be used, i.e., each subelement deposit of Dram is predetermined
Data are will not be changed, checks and changes when if distributing again, there are wild pointers in read-me, distort
The data.
Method is determined based on above-mentioned wild pointer, and the present invention also provides the localization methods of wild pointer.Fig. 5 is the present invention one
The flow chart of the localization method of wild pointer in Dram in embodiment.Referring to Figure 5, the step in wild pointer localization method
Rapid S1~S3 determines that step S1~S3 in method is consistent with wild pointer, and open country is please referred to about step S1~S3 in localization method
Pointer determines that step S1~S3 in method, the present embodiment repeat no more this.Step S4 is introduced below.
Step S4 is executed, if there are wild pointer in program, according to inconsistent one or more of its interior data and pre-stored data
The function that the one or more subelement address is corresponded in Memory Allocation solicited message is searched in the address of a subelement, with positioning
Hold the function of wild pointer.
The address that the address of its interior data and the inconsistent one or more subelements of pre-stored data, i.e. wild pointer are directed toward.
According to temporal locality principle, it is most recently used the function for the subelement being tampered, the possibility for holding wild pointer is maximum.Most
It is the function in Memory Allocation request closely to use the function of the subelement being tampered.
From the initial address for being released memory to termination address, the address for the subelement being tampered is found；Foundation is usurped
The address of the subelement changed, find in Memory Allocation solicited message with the relevant function in the address, you can to wild pointer position.
In the Memory Allocation solicited message that abovementioned steps S1 is preserved, if saving：Each son of assigned Dram is single
The filename of program file or program file where first relevant function in address and the function；It then can not only position open country
Function where pointer, and the filename of the program file or program file of holding wild pointer can be positioned.
In the Memory Allocation solicited message that abovementioned steps S1 is preserved, if also saving：Each son of assigned Dram
The line number of the relevant function in element address row residing in program file；Then be conducive to quickly find the open country in program file
The specific location of pointer is conducive to modify to the wild pointer.
In above-mentioned wild pointer determination and localization method, the data phase of Dram deposit in each subelement when initializing
Together, the tentation data being written in each subelement of the Dram discharged is also identical.In other schemes, at the beginning of Dram
The data being stored in each subelement when beginningization can differ, correspondingly, in each subelement of the Dram discharged
The tentation data of interior write-in can not also be identical, but for the same subelement, data that when initialization is stored in and is deposited after release
The tentation data entered is identical.
In addition, it could be seen that in above-mentioned wild pointer determination and localization method, distribution Dram, release dynamics memory are only
It has carried out once, in actual program, for the Dram in same address field, distribution, release might have repeatedly.For
The above situation, Fig. 6 are the flow charts of the determination method of wild pointer in the Dram in another embodiment of the present invention.
With reference to shown in Fig. 6 and Fig. 1, it can be seen that difference lies in：After step S2 discharges distributed Dram in Fig. 1,
Also carry out step S1 distribution Dram, step S2 release dynamics memories cycle at least once.Correspondingly, it 1) checks dynamic
Data in each subelement of state memory be again the assigned as last time whether consistent with the tentation data of corresponding subelement recycles
Discharged Dram is distributed afterwards；2) the tentation data phase being written in subelement is corresponded in the Dram discharged every time
Together.
It should be noted that in the flow of Fig. 6, the initialization of Dram only carries out once, and in other words, initialization is laggard
The cycle of row repeated dispensing, release dynamics memory.
Fig. 7 is the result schematic diagram of the dynamic memory deallocation history table of each secondary release dynamics memory.Assigned is dynamic
State memory before releasing, is both needed to first copy by the Memory Allocation solicited message that Dram interblock records every time,
And sequentially, corresponding table item 1,2 ....
Method is determined based on the wild pointer in Fig. 6, and the present invention also provides the localization methods of corresponding wild pointer.
Fig. 8 is the flow chart of the localization method of wild pointer in the Dram in another embodiment of the present invention.With reference to Fig. 8 institutes
Show, with the step S4 in Fig. 5 difference lies in, in this step S4 ', according to its interior data and pre-stored data inconsistent one or
It is single to correspond to one or more in the Memory Allocation solicited message of each secondary dynamic memory distribution of screening for the address of multiple subelements
The function of first address holds the function of wild pointer with positioning.
According to temporal locality principle, it is most recently used the function for the subelement being tampered, holds corresponding wild pointer
Possibility is maximum, closer to possibility is bigger.Thus, gradually screening each Memory Allocation solicited message when, closer to last
Secondary release dynamics memory, more first screening.
The case where for dynamic memory deallocation history table, can be remembered according to dynamic memory deallocation history table
The list item of record, by list item sequence inverted order screening.
Wild pointer is determined and positions, and is conducive to find and change the wild pointer, prevents system crash.
Although present disclosure is as above, present invention is not limited to this.Any those skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (10)
1. a kind of determination method of wild pointer in Dram, which is characterized in that including：
According to the Memory Allocation request distribution Dram in program, and the Memory Allocation solicited message under normal allocation is preserved；
After the Dram for discharging the distribution, tentation data is written in each subelement of the Dram discharged；
When the Dram discharged described in sub-distribution again, the data in each subelement of the Dram and corresponding son are first checked
Whether the tentation data of unit is consistent；If existing, one or more subelements are inconsistent, and there are wild pointers in described program, if
Each subelement is all consistent, then wild pointer is not present in described program.
2. determining method according to claim 1, which is characterized in that when the request distribution Dram according to Memory Allocation
Dram whether can the judgment method of normal allocation be：Before distribution, the data in each subelement of Dram and institute are checked
Whether the data for stating corresponding subelement deposit when Dram initialization are consistent；If each subelement is all consistent, in the dynamic
Deposit can normal allocation, if existing, one or more subelements are inconsistent, and the Dram can not normal allocation.
3. determining method according to claim 1, which is characterized in that the Memory Allocation solicited message of the preservation includes：
Program file or described program file where the relevant function in each subelement address of Dram and the function
Filename.
4. determining method according to claim 3, which is characterized in that the Memory Allocation solicited message of the preservation is also wrapped
It includes：The line number of each relevant function in subelement address of Dram row residing in described program file.
5. determining method according to claim 1, which is characterized in that after the Dram for discharging the distribution, also carry out
Distribution, release dynamics memory cycle at least once, check data in each subelement of the Dram and corresponding subelement
The whether consistent distribution release being assigned as again after last time recycles of tentation data Dram；Every time in institute
It is identical that the Dram of release corresponds to the tentation data being written in subelement；
It is described distribution, release dynamics memory cycle include：
According to the Memory Allocation request distribution Dram in program, and the Memory Allocation solicited message under normal allocation is preserved；
After the Dram for discharging the distribution, tentation data is written in each subelement of the Dram discharged.
6. determining method according to claim 5, which is characterized in that when the release dynamics memory, also create in dynamic
Release history table is deposited, the dynamic memory deallocation history table is used for：Every time when the Dram of release distribution, deposit
Previous step distributes the Memory Allocation solicited message preserved when Dram.
7. the localization method of wild pointer in a kind of Dram, which is characterized in that including：
The determination method of wild pointer according to any one of claims 1 to 4, if there are wild pointers in program, according in it
Corresponding in the Memory Allocation solicited message be somebody's turn to do is searched in the address of data and the inconsistent one or more subelements of pre-stored data
The function of one or more subelement addresses holds the function of wild pointer with positioning.
8. the localization method of wild pointer in a kind of Dram, which is characterized in that including：
The determination method of wild pointer according to claim 5, if there are wild pointer in program, according to its interior data with prestore
The address of the inconsistent one or more subelements of data, the Memory Allocation solicited message of each secondary dynamic memory distribution of screening
The function of the middle correspondence one or more subelement address holds the function of wild pointer with positioning.
9. the localization method of wild pointer in a kind of Dram, which is characterized in that including：
The determination method of wild pointer according to claim 6, if there are wild pointer in program, according to its interior data with prestore
The dynamic memory deallocation history table, each list item of screening are searched in the address of the inconsistent one or more subelements of data
The Memory Allocation solicited message in correspond to the function of the one or more subelement address, the letter of wild pointer is held with positioning
Number.
10. localization method according to claim 9, which is characterized in that gradually when each list item of screening, closer to last time
Release dynamics memory, more first screening.
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| US6751798B1 (en) * | 1996-07-11 | 2004-06-15 | 724 Solutions Software Inc. | Method and apparatus for performing distributed object calls using proxies and memory allocation |
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