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authorFangrui Song <i@maskray.me>2020-11-12 08:53:11 -0800
committerFangrui Song <i@maskray.me>2020-11-12 08:53:11 -0800
commit73d01a80cec397cb4e66ebb88a1204866b31ca59 (patch)
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parent2a9aed0e8b538955f38f036bd34ea79adfce2ad7 (diff)
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[ELF] Sort by input order within an input section description
According to https://sourceware.org/binutils/docs/ld/Input-Section-Basics.html#Input-Section-Basics for `*(.a .b)`, the order should match the input order: * for `ld 1.o 2.o`, sections from 1.o precede sections from 2.o * within a file, `.a` and `.b` appear in the section header table order This patch implements the behavior. The interaction with `SORT*` and --sort-section is: Matched sections are ordered by radix sort with the keys being `(SORT*, --sort-section, input order)`, where `SORT*` (if present) is most significant. > Note, multiple `SORT*` within an input section description has undocumented and > confusing behaviors in GNU ld: > https://sourceware.org/pipermail/binutils/2020-November/114083.html > Therefore multiple `SORT*` is not the focus for this patch but > this patch still strives to have an explainable behavior. As an example, we partition `SORT(a.*) b.* c.* SORT(d.*)`, into `SORT(a.*) | b.* c.* | SORT(d.*)` and perform sorting within groups. Sections matched by patterns between two `SORT*` are sorted by input order. If --sort-alignment is given, they are sorted by --sort-alignment, breaking tie by input order. This patch also allows a section to be matched by multiple patterns, previously duplicated sections could occupy more space in the output and had erroneous zero bytes. The patch is in preparation for support for `*(SORT_BY_INIT_PRIORITY(.init_array.* .ctors.*)) *(.init_array .ctors)`, which will allow LLD to mix .ctors*/.init_array* like GNU ld (gold's --ctors-in-init-array) PR44698 and PR48096 Reviewed By: grimar, psmith Differential Revision: https://reviews.llvm.org/D91127
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