International Business Machines Corporation

Jinsong Ji

Zheng Chen

Si Yuan Zhang

Ke Wen Lin

JiuFu Guo

Huai Yun Ban

Qing Feng Zhang

Yuheng Zhang

Xiao Feng Guan

Wai Hung Tsang

Yi Zeng Mao

Chaofan Qiu

Xiong Hu Luo

Feedback-directed pass pipeline optimization in static compilation includes receiving a set of source input of source code by a static compiler. The static compiler initiates a compilation operation on the source code in which, in a pass pipeline during the compilation operation that creates an intermediate representation (IR) representing the source code, a set of optimization diagnostics identified during a first pass of the pass pipeline is emitted into a side file. The pass pipeline is then optimized using the set of optimization diagnostics.

Feedback-directed pass pipeline optimization in static compilation

Provided are embodiments for a method of performing register pressure targeted function splitting. The method can include determining a candidate region of a function, the candidate region comprising variables, and determining a number of available registers in a computing system for allocating the variables of the function. The method can also include grouping the variables in the candidate region into first variables and second variables based at least in part on the number of available registers, and splitting the candidate region of the function into split functions based at least in part on the grouping of the variables. Also provided are embodiments for a computer program product and a system for performing register pressure targeted function splitting.

Register pressure target function splitting

Provided are techniques for using relocatable debugging information entries to save compile time when there are changes to source code. While compiling source code, for an unchanged function, a copy is made of a relocatable debugging information entries table and of a relocation information table. In addition, for a changed function, a new relocatable debugging information entries table and a new relocation information table are generated. The copy of the relocatable debugging information entries table and the new relocatable debugging information entries table are merged. The copy of the relocation information table and the new relocation information table are merged. The relocatable debugging information entries in the merged relocatable debugging information entries table are resolved according to information in the merged relocation information table to generate relocated Debugging with Attributed Record Formats information, which is stored in an object file that corresponds to the source code.

Using relocatable debugging information entries to save compile time

Embodiments of the present disclosure relate to methods, systems, and computer program products for monitoring a state of an application. A target object that is to be monitored in an application may be determined in response to receiving a monitoring configuration. A position of the target object in source codes of the application may be identified. A state of the target object may be monitored in response to the application being traced to a location corresponding to the position.

Application state monitoring

A method, apparatus, and computer program product for optimizing software are provided. The software includes a plurality of modules which include at least one controllable module, the method comprises: determining a shared symbol defined by the at least one controllable module, the shared symbol being a symbol used by two or more modules of the software; generating a symbol use file indicating the shared symbol defined by the at least one controllable module; and rebuilding the software based on the symbol use file, so that a symbol table in a controllable module of the rebuilt software only contains the shared symbol indicated in the symbol use file. A number of symbols in the symbol table can be reduced accurately and effectively, thereby time needed for loading the symbol table can be reduced and software execution efficiency can be improved.

Optimization of software symbol tables

A method and system for structuring program code to implement program debugging of the program code using tracking of variables. A first variable to be tracked and a first expression associated with the first variable are determined. The program code includes the first variable and the first expression. A reverse scanning of the program code is performed to search for a first assignment expression within a first assignment statement that assigns a value of the first assignment expression to the first variable. In response to finding the first assignment expression via the reverse scanning, a first watch point for determining a true/false value of the first expression is inserted into the program code after the first assignment statement.

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Jinsong Ji