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Light: Replay via Tightly Bounded Recording 15

Light: Replay via Tightly Bounded Recording

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36th acm sigplan conference on programming language design and implementation

作者： Liu, Peng Zhang, Xiangyu Tripp, Omer Zheng, Yunhui Purdue Univ W Lafayette IN 47907 USA

ISBN: (纸本)9781450334686

Reproducing concurrency bugs is a prominent challenge. Existing techniques either rely on recording very fine grained execution information and hence have high runtime overhead, or strive to log as little information as possible but provide no guarantee in reproducing a bug. We present Light, a technique that features much lower overhead compared to techniques based on fine grained recording, and that guarantees to reproduce concurrent bugs. We leverage and formally prove that recording flow dependences is the necessary and sufficient condition to reproduce a concurrent bug. The flow dependences, together with the thread local orders that can be automatically inferred (and hence not logged), are encoded as scheduling constraints. An SMT solver is used to derive a replay schedule, which is guaranteed to exist even though it may be different from the original schedule. Our experiments show that Light has only 44% logging overhead, almost one order of magnitude lower than the state of the art techniques relying on logging memory accesses. Its space overhead is only 10% of those techniques. Light can also reproduce all the bugs we have collected whereas existing techniques miss some of them.

关键词： design Performance Reliability Concurrency Replay Thread Determinism Tight Bound Local Recording

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Taming the Wildcards: Combining Definition- and Use-Site Variance 11

Taming the Wildcards: Combining Definition- and Use-Site Var...

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32nd acm sigplan conference on programming language design and implementation (pldi 11)

作者： Altidor, John Huang, Shan Shan Smaragdakis, Yannis Univ Massachusetts Dept Comp Sci Amherst MA 01003 USA

ISBN: (纸本)9781450306638

Variance allows the safe integration of parametric and subtype polymorphism. Two flavors of variance, definition-site versus use-site variance, have been studied and have had their merits hotly debated. Definition-site variance (as in Scala and C#) offers simple type-instantiation rules, but causes fractured definitions of naturally invariant classes;Use-site variance (as in Java) offers simplicity in class definitions, yet complex type-instantiation rules that elude most programmers. We present a unifying framework for reasoning about variance. Our framework is quite simple and entirely denotational, that is, it evokes directly the definition of variance with a small core calculus that does not depend on specific type systems. This general framework can have multiple applications to combine the best of both worlds: for instance, it can be used to add use-site variance annotations to the Scala type system. We show one such application in detail: we extend the Java type system with a mechanism that modularly infers the definition-site variance of type parameters, while allowing use-site variance annotations on any type-instantiation. Applying our technique to six Java generic libraries (including the Java core library) shows that 20-58% (depending on the library) of generic definitions are inferred to have single-variance;8-63% of method signatures can be relaxed through this inference, and up to 91% of existing wildcard annotations are unnecessary and can be elided.

关键词： variance definition-site variance use-site variance wildcards language extensions

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implementation of the Memory-safe Full ANSI-C Compiler 09

Implementation of the Memory-safe Full ANSI-C Compiler

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acm sigplan conference on programming language design and implementation

作者： Oiwa, Yutaka Natl Inst Adv Ind Sci & Technol Res Ctr Informat Secur RCIS Tokyo Japan

ISBN: (纸本)9781605583921

This paper describes a completely memory-safe compiler for C language programs that is fully compatible with the ANSI C specification. Programs written in C often suffer from nasty errors due to dangling pointers and buffer overflow. Such errors in Internet server programs are often exploited by malicious attackers to crack an entire system. The origin of these errors is usually corruption of in-memory data structures caused by out-of-bound array accesses. Usual C compilers do not provide any protection against such out-of-bound access, although many other languages such as Java and ML do provide such protection. There have been several proposals for preventing such memory corruption from various aspects: runtime buffer overrun detectors, designs for new C-like languages, and compilers for (subsets of) the C language. However, as far as we know, none of them have achieved full memory protection and full compatibility with the C language specification at the same time. We propose the most powerful solution to this problem ever presented. We have developed Fail-Safe C, a memory-safe implementation of the full ANSI C language. It detects and disallows all unsafe operations, yet conforms to the full ANSI C standard (including casts and unions). This paper introduces several techniques-both compile-time and runtime-to reduce the overhead of runtime checks, while still maintaining 100% memory safety. This compiler lets programmers easily make their programs safe without heavy rewriting or porting of their code. It also supports many of the "dirty tricks" commonly used in many existing C programs, which do not strictly conform to the standard specification. In this paper, we demonstrate several real-world server programs that can be processed by our compiler and present technical details and benchmark results for it.

关键词： Memory Safety C language

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The exo VM system for automatic VM and application reduction 07

The exo VM system for automatic VM and application reduction

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conference on programming language design and implementation

作者： Titzer, Ben L. Auerbach, Joshua Bacon, David F. Palsberg, Jens Univ Calif Los Angeles Compilers Grp Los Angeles CA 90025 USA

ISBN: (纸本)9781595936332

Embedded systems pose unique challenges to Java application developers and virtual machine designers. Chief among these challenges is the memory footprint of both the virtual machine and the applications that run within it. With the rapidly increasing set of features provided by the Java language, virtual machine designers are often forced to build custom implementations that make various tradeoffs between the footprint of the virtual machine and the subset of the Java language and class libraries that are supported. In this paper, we present the Exo VM, a system in which an application is initialized in a fully featured virtual machine, and then the code, data, and virtual machine features necessary to execute it are packaged into a binary image. Key to this process is feature analysis, a technique for computing the reachable code and data of a Java program and its implementation inside the VM simultaneously. The Exo VM reduces the need to develop customized embedded virtual machines by reusing a single VM infrastructure and automatically eliding the implementation of unused Java features on a per-program basis. We present a constraint-based instantiation of the analysis technique, an implementation in IBM's J9 Java VM, experiments evaluating our technique for the EEMBC benchmark suite, and some discussion of the individual costs of some of Java's features. Our evaluation shows that our system can reduce the non-heap memory allocation of the virtual machine by as much as 75%. We discuss VM and language design decisions that our work shows are important in targeting embedded systems, supporting the long-term goal of a common VM infrastructure spanning from motes to large servers.

关键词： pre-initialization embedded systems persistence dead code elimination static compilation static analysis VM design VM modularity feature analysis

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A region-based compilation technique for a Java just-in-time compiler 03

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conference on programming language design and implementation

作者： Suganuma, T Yasue, T Nakatani, T IBM Japan Ltd Tokyo Res Lab Yamato 2428502 Japan

ISBN: (纸本)9781581136623

Method inlining and data flow analysis are two major optimization components for effective program transformations, however they often suffer from the existence of rarely or never executed code contained in the target method. One major problem lies in the assumption that the compilation unit is partitioned at method boundaries. This paper describes the design and implementation of a region-based compilation technique in our dynamic compilation system, in which the compiled regions are selected as code portions without rarely executed code. The key part of this technique is the region selection, partial inlining, and region exit handling. For region selection, we employ both static heuristics and dynamic profiles to identify rare sections of code. The region selection process and method inlining decision are interwoven, so that method inlining exposes other targets for region selection, while the region selection in the inline target conserves the inlining budget, leading to more method inlining. Thus the inlining process can be performed for parts of a method, not for the entire body of the method. When the program attempts to exit from a region boundary, we trigger recompilation and then rely on on-stack replacement to continue the execution from the corresponding entry point in the recompiled code. We have implemented these techniques in our Java JIT compiler, and conducted a comprehensive evaluation. The experimental results show that the approach of region-based compilation achieves approximately 5% performance improvement on average, while reducing the compilation overhead by 20 to 30%, in comparison to the traditional function-based compilation techniques.

关键词： performance design experimentation measurement languages region-based compilation dynamic compilers partial inlining on-stack replacement

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Advanced Automata-Based Algorithms for Program Termination Checking 2018

Advanced Automata-Based Algorithms for Program Termination C...

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39th acm sigplan conference on programming language design and implementation (pldi)

作者： Chen, Yu-Fang Heizmann, Matthias Lengal, Ondrej Li, Yong Tsai, Ming-Hsien Turrini, Andrea Zhang, Lijun Acad Sinica Taipei Taiwan Natl Taipei Univ New Taipei Taiwan Univ Freiburg Freiburg Germany Brno Univ Technol FIT IT4Innovat Ctr Excellence Brno Czech Republic Chinese Acad Sci Univ Chinese Acad Sci Inst Software State Key Lab Comp Sci Beijing Peoples R China Chinese Acad Sci Inst Software State Key Lab Comp Sci Beijing Peoples R China

ISBN: (纸本)9781450356985

In 2014, Heizmann et al. proposed a novel framework for program termination analysis. The analysis starts with a termination proof of a sample path. The path is generalized to a Buchi automaton (BA) whose language (by construction) represents a set of terminating paths. All these paths can be safely removed from the program. The removal of paths is done using automata difference, implemented via BA complementation and intersection. The analysis constructs in this way a set of BAs that jointly "cover" the behavior of the program, thus proving its termination. An implementation of the approach in Ultimate Automizer won the 1st place in the Termination category of SV-Comp 2017. In this paper, we exploit advanced automata-based algorithms and propose several non-trivial improvements of the framework. To alleviate the complementation computation for BAs-one of the most expensive operations in the framework-, we propose a multi-stage generalization construction. We start with generalizations producing subclasses of BAs (such as deterministic BAs) for which efficient complementation algorithms are known, and proceed to more general classes only if necessary. Particularly, we focus on the quite expressive subclass of semideterministic BAs and provide an improved complementation algorithm for this class. Our experimental evaluation shows that the proposed approach significantly improves the power of termination checking within the Ultimate Automizer framework.

关键词： Program Termination Buchi Automata Complementation and language Difference

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Dynamic feedback: An effective technique for adapting computing

Dynamic feedback: An effective technique for adapting comput...

引用

Proceedings of the 1997 acm SIGPLAM conference on programming language design and implementation, pldi

作者： Diniz, Pedro Rinard, Martin Univ of California Santa Barbara Santa Barbara United States

This paper presents dynamic feedback, a technique that enables computations to adapt dynamically to different execution environments. A compiler that uses dynamic feedback produces several different versions of the same source code;each version uses a different optimization policy. The generated code alternately performs sampling phases and production phases. Each sampling phase measures the overhead of each version in the current environment. Each production phase uses the version with the least overhead in the previous sampling phase. The computation periodically resamples to adjust dynamically to changes in the environment. We have implemented dynamic feedback in the context of a parallelizing compiler for object-based programs. The generated code uses dynamic feedback to automatically choose the best synchronization optimization policy. Our experimental results show that the synchronization optimization policy has a significant impact on the overall performance of the computation, that the best policy varies from program to program, that the compiler is unable to statically choose the best policy, and that dynamic feedback enables the generated code to exhibit performance that is comparable to that of code that has been manually tuned to use the best policy. We have also performed a theoretical analysis which provides, under certain assumptions, a guaranteed optimality bound for dynamic feedback relative to a hypothetical (and unrealizable) optimal algorithm that uses the best policy at every point during the execution.

关键词： Computer programming languages

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PetaBricks: A language and Compiler for Algorithmic Choice 09

PetaBricks: A Language and Compiler for Algorithmic Choice

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acm sigplan conference on programming language design and implementation

作者： Ansel, Jason Chan, Cy Wong, Yee Lok Olszewski, Marek Zhao, Qin Edelman, Alan Amarasinghe, Saman MIT Comp Sci & Artificial Intelligence Lab Cambridge MA 02139 USA

ISBN: (纸本)9781605583921

It is often impossible to obtain a one-size-fits-all solution for high performance algorithms when considering different choices for data distributions, parallelism, transformations, and blocking. The best solution to these choices is often tightly coupled to different architectures, problem sizes, data, and available system resources. In some cases, completely different algorithms may provide the best performance. Current compiler and programming language techniques are able to change some of these parameters, but today there is no simple way for the programmer to express or the compiler to choose different algorithms to handle different parts of the data. Existing solutions normally can handle only coarse-grained, library level selections or hand coded cutoffs between base cases and recursive cases. We present PetaBricks, a new implicitly parallel language and compiler where having multiple implementations of multiple algorithms to solve a problem is the natural way of programming. We make algorithmic choice a first class construct of the language. Choices are provided in a way that also allows our compiler to tune at a finer granularity. The PetaBricks compiler autotunes programs by making both fine-grained as well as algorithmic choices. Choices also include different automatic parallelization techniques, data distributions, algorithmic parameters, transformations, and blocking. Additionally, we introduce novel techniques to autotune algorithms for different convergence criteria. When choosing between various direct and iterative methods, the PetaBricks compiler is able to tune a program in such a way that delivers near-optimal efficiency for any desired level of accuracy. The compiler has the flexibility of utilizing different convergence criteria for the various components within a single algorithm, providing the user with accuracy choice alongside algorithmic choice.

关键词： Algorithms languages Performance

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Fault-tolerant typed assembly language 07

Fault-tolerant typed assembly language

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conference on programming language design and implementation

作者： Perry, Frances Mackey, Lester Reis, George A. Ligatti, Jay August, David I. Walker, David Princeton Univ Dept Comp Sci & Elect Engn Princeton NJ 08544 USA Univ S Florida Dept Comp Sci & Comp Engn Tampa FL 33620 USA

ISBN: (纸本)9781595936332

A transient hardware fault occurs when an energetic particle strikes a transistor, causing it to change state. Although transient faults do not permanently damage the hardware, they may corrupt computations by altering stored values and signal transfers. In this paper, we propose a new scheme for provably safe and reliable computing in the presence of transient hardware faults. In our scheme, software computations are replicated to provide redundancy while special instructions compare the independently computed results to detect errors before writing critical data. In stark contrast to any previous efforts in this area, we have analyzed our fault tolerance scheme from a formal, theoretical perspective. To be specific, first, we provide an operational semantics for our assembly language, which includes a precise formal definition of our fault model. Second, we develop an assembly-level type system designed to detect reliability problems in compiled code. Third, we provide a formal specification for program fault tolerance under the given fault model and prove that all well-typed programs are indeed fault tolerant. In addition to the formal analysis, we evaluate our detection scheme and show that it only takes 34% longer to execute than the unreliable version.

关键词： languages reliability theory verification transient hardware faults soft faults fault tolerance type systems typed assembly language

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A Context-free Markup language for Semi-structured Text 10

A Context-free Markup Language for Semi-structured Text

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acm sigplan conference on programming language design and implementation

作者： Xi, Qian Walker, David Princeton Univ Princeton NJ 08544 USA

ISBN: (纸本)9781450300193

An ad hoc data format is any nonstandard, semi-structured data format for which robust data processing tools are not easily available. In this paper, we present ANNE, a new kind of markup language designed to help users generate documentation and data processing tools for ad hoc text data. More specifically, given a new ad hoc data source, an ANNE programmer edits the document to add a number of simple annotations, which serve to specify its syntactic structure. Annotations include elements that specify constants, optional data, alternatives, enumerations, sequences, tabular data, and recursive patterns. The ANNE system uses a combination of user annotations and the raw data itself to extract a context-free grammar from the document. This context-free grammar can then be used to parse the data and transform it into an XML parse tree, which may be viewed through a browser for analysis or debugging purposes. In addition, the ANNE system generates a PADS/ML description [19], which may be saved as lasting documentation of the data format or compiled into a host of useful data processing tools. In addition to designing and implementing ANNE, we have devised a semantic theory for the core elements of the language. This semantic theory describes the editing process, which translates a raw, unannotated text document into an annotated document, and the grammar extraction process, which generates a context-free grammar from an annotated document. We also present an alternative characterization of system behavior by drawing upon ideas from the field of relevance logic. This secondary characterization, which we call relevance analysis, specifies a direct relationship between unannotated documents and the context-free grammars that our system can generate from them. Relevance analysis allows us to prove important theorems concerning the expressiveness and utility of our system.

关键词： Domain-specific languages Tool Generation Ad Hoc Data PADS ANNE

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