mirror of https://github.com/golang/go.git
f75ab2d5a6
One of escape analysis's responsibilities is to summarize whether/how each function parameter flows to the heap so we can correctly incorporate those flows into callers' escape analysis data flow graphs. As an optimization, we separately record when parameters flow to result parameters, so that we can more precisely analyze parameter flows based on how the results are used at the call site. However, if a named result parameter itself needs to be heap allocated, this optimization isn't safe and the parameter needs to be recorded as flowing to heap rather than flowing to result. Escape analysis used to get this correct because it conservatively rewalked the data-flow graph multiple times. So even though it would incorrectly record the result parameter flow, it would separately find a flow to the heap. However, CL 196811 (specifically, case 3) optimized the walking logic to reduce unnecessary rewalks causing us to stop finding the extra heap flow. This CL fixes the issue by correcting location.leakTo to be sensitive to sink.escapes and not record result-flows when the result parameter escapes to the heap. Fixes #44658. Change-Id: I48742ed35a6cab591094e2d23a439e205bd65c50 Reviewed-on: https://go-review.googlesource.com/c/go/+/297289 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-on: https://go-review.googlesource.com/c/go/+/297291 |
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| escape_selfassign.go | ||
| escape_slice.go | ||
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README.md
The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.
To run just these tests, execute:
../bin/go run run.go
Standard library tests should be written as regular Go tests in the appropriate package.
The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:
- it is most naturally expressed using the test runner; or
- it is also applicable to
gccgoand other Go tool chains.