tree 8be9b0a25044b93f6e96ff882cefc4b804d921c7
parent 78c9a657fdbc9e812d39910fb93fbae4affe4360
author Ian Lance Taylor <iant@golang.org> 1606182508 -0800
committer Ian Lance Taylor <iant@golang.org> 1606320110 +0000

compiler: avoid silent truncation for string(1 << 32)

In the conversion of a constant integer to a string type, the value of
the constant integer was being silently truncated from unsigned long
to unsigned int, producing the wrong string value.  Add an explicit
overflow check to avoid this problem.

For golang/go#42790

Change-Id: I3407410bb02c24edd114e5f78a1f60ab66378656
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/272611
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>