International Business Machines Corporation

Levon Sassoon Stepanian

Kevin Alexander Stoodley

Allan Henry Kielstra

Marcel Mitran

Alexander Steven Ross

A method, apparatus, and computer instructions are provided for inlining native functions into compiled Java code. A conversion engine is provided by the present invention for converting the intermediate representation of native functions to the just-in-time (JIT) compiler's intermediate representation. With the converted intermediate representation, an inliner recursively inlines the converted JIT compiler's intermediate representation into the native callsite to remove the need of invoking the native function and subsequent native calls made by the function. The inlining process continues until either a call to an opaque function is encountered or until a JIT compiler intermediate representation growth limits are reached. The inliner also replaces calls to most native functions that are non-inlineable or opaque with calls to synthesized native functions that provide access to native libraries containing implementations of the original non-inlineable calls.

Inlining native functions into compiled java code

A method, apparatus, and computer instructions for transforming JAVA Native Interface function calls to constants, internal just-in-time (JIT) compiler operations or simpler intermediate representation. A compiler generates plurality of intermediate representations for a plurality of native interface function calls. During inlining of native code, matching is performed on each native function call (against this list) and a list of native interface function calls is generated. For each native interface function call, a (JIT) call transformer attempts to replace the native interface function call with a constant, internal JIT compiler operation or a simpler intermediate representation depending on the type of native interface function call.

Method and apparatus for transforming java native interface function calls into simpler operations during just-in-time compilation

A computer implemented method for determining when to change a representation type of at least one number stored in a memory of a data processing system. An operation is received in a processor of the data processing system. The operation references a number stored as a class of an object-oriented programming language. The number is stored as a first representation type. Responsive to the operation being biased towards the first representation type, a first counter is incremented. Responsive to the operation being biased towards a second representation type, a second counter is incremented. A counter reference is equal to a first value of the first counter subtracted from a second value of the second counter. Responsive to the counter reference exceeding a threshold number, representation of a subsequent number is changed from the first representation type to the second representation type.

Hysteresis for mixed representation of Java BigDecimal objects

Method for inlining native functions into compiled java code

A method and apparatus for transforming JAVA Native Interface function calls to constants, internal just-in-time (JIT) compiler operations or simpler intermediate representation. A compiler generates a plurality of intermediate representations for a plurality of native interface function calls. During inlining of native code, matching is performed on each native function call (against this list) and a list of native interface function calls is generated. For each native interface function call, a (JIT) call transformer attempts to replace the native interface function call with a constant, internal JIT compiler operation or a simpler intermediate representation depending on the type of native interface function call.

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Toronto, Canada

Levon Sassoon Stepanian