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David Crawshaw authored
Many read-only strings in Go binaries are substrings of other read-only strings. A common source is the text form of type information, which will include both "struct { X int }" and "*struct { X int }" or "*bytes.Reader" and "func(*bytes.Reader)" in the same binary. Because this character data is referred to by separate string headers, we can skip writing the smaller string and modify the pointer relocation to point to the larger string. This CL does this deduplication in the linker after the reachable set of strings has been determined. This removes 765KB from juju (1.4% without DWARF). Link time goes at tip goes form 4.6s to 6.3s, but note that this CL is part of a series that recently reduced link time from 9.6s. For #6853. Change-Id: Ib2087cf627c9f1e9a1181f9b4c8f81d1a3f42191 Reviewed-on: https://go-review.googlesource.com/19987Reviewed-by:
Ian Lance Taylor <iant@golang.org> Run-TryBot: David Crawshaw <crawshaw@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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