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Previous CLs add new language constructs in Go 1.17, specifically,
unsafe.Add, unsafe.Slice, and conversion from a slice to a pointer
to an array. This CL handles them in the escape analysis.

At the point of the escape analysis, unsafe.Add and unsafe.Slice
are still builtin calls, so just handle them in data flow.
Conversion from a slice to a pointer to an array has already been
lowered to a combination of compound expression, conditional
expression and slice info expressions, so handle them in the
escape analysis.

Change-Id: Iccac4f0135f2bd6081ca93707db1c7b608350052
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/339671
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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A Go frontend

Ian Lance Taylor Last update 15 June 2014

This is a compiler frontend for the Go programming language. The frontend was originally developed at Google, and was released in November 2009. It was originally written by Ian Lance Taylor.

It was originally written for GCC. As of this writing it only supports GCC, but the GCC support has been separated from the rest of the frontend, so supporting another compiler is feasible.

The go subdirectory holds the frontend source code. This is mirrored to the gcc/go subdirectory in the GCC repository.

The libgo subdirectory holds the library source code. This is a copy of the main Go library with various changes appropriate for this compiler. The main Go library is hosted at http://go.googlesource.com/go, in the src directory. The libgo subdirectory is mirrored to the libgo subdirectory in the gcc repository.

Legal Matters

To contribute patches to the files in this directory, please see Contributing to the gccgo frontend.

The master copy of these files is hosted in Gerrit (there is a mirror at Github). Changes to these files require signing a Google contributor license agreement. If you are the copyright holder, you will need to agree to the Google Individual Contributor License Agreement. This agreement can be completed online.

If your organization is the copyright holder, the organization will need to agree to the Google Software Grant and Corporate Contributor License Agreement.

If the copyright holder for your code has already completed the agreement in connection with another Google open source project, it does not need to be completed again.

The authors of these files may be found in the AUTHORS and CONTRIBUTORS files.