[lld] [LLD] Add CLASS syntax to SECTIONS (PR #95323)
Daniel Thornburgh via llvm-commits
llvm-commits at lists.llvm.org
Mon Jun 24 17:03:24 PDT 2024
================
@@ -0,0 +1,377 @@
+# REQUIRES: x86
+
+# RUN: rm -rf %t && split-file %s %t && cd %t
+
+# RUN: llvm-mc -n -filetype=obj -triple=x86_64 matching.s -o matching.o
+
+## CLASS definitions match sections in linker script order. The sections may be
+## placed in a different order. Classes may derive from one another, and class
+## references may be restricted by INPUT_SECTION_FLAGS.
+
+# RUN: ld.lld -T matching.ld matching.o -o matching
+# RUN: llvm-readobj -x .rodata -x .rodata.d matching | FileCheck %s --check-prefix=MATCHING
+
+# MATCHING: .rodata
+# MATCHING-NEXT: 020301
+# MATCHING: .rodata.d
+# MATCHING-NEXT: 04
+
+
+## An error is reported when a section class has more than one description.
+
+# RUN: not ld.lld -T already-defined.ld matching.o 2>&1 | \
+# RUN: FileCheck %s --check-prefix=ALREADY-DEFINED --implicit-check-not=error:
+
+# ALREADY-DEFINED: error: already-defined.ld:3: section class 'a' already defined
+
+
+## An error is reported when a filename pattern is missing in a section class
+## description.
+
+# RUN: not ld.lld -T missing-filename-pattern.ld matching.o 2>&1 | \
+# RUN: FileCheck %s --check-prefix=MISSING-FILENAME-PATTERN --implicit-check-not=error:
+
+# MISSING-FILENAME-PATTERN: error: missing-filename-pattern.ld:2: expected filename pattern
+
+
+## An error is reported when the content of section classes is demanded before
+## its definition is processed.
+
+# RUN: not ld.lld -T referenced-before-defined.ld matching.o 2>&1 | \
+# RUN: FileCheck %s --check-prefix=REFERENCED-BEFORE-DEFINED
+
+# REFERENCED-BEFORE-DEFINED: error: section class 'a' referenced by '.rodata' before class definition
+
+## An error is reported when an input section is bound to a section class but
+## is not referenced by at least one output section.
+
+# RUN: not ld.lld -T unreferenced.ld matching.o 2>&1 | \
+# RUN: FileCheck %s --check-prefix=UNREFERENCED
+
+# UNREFERENCED: error: section '.rodata.a' assigned to class 'a' but unreferenced by any output section
+
+
+## An error is reported when one section class references another.
+
+# RUN: not ld.lld -T class-references-class.ld matching.o 2>&1 | \
+# RUN: FileCheck %s --check-prefix=CLASS-REFERENCES-CLASS --implicit-check-not=error:
+
+# CLASS-REFERENCES-CLASS: error: class-references-class.ld:3: section class 'b' references class 'a'
+
+
+# RUN: llvm-mc -n -filetype=obj -triple=x86_64 spill.s -o spill.o
+
+
+## An input section in a class spills to a later class ref when the region of
+## its first ref would overflow. The spill uses the alignment of the later ref.
+
+# RUN: ld.lld -T spill.ld spill.o -o spill
+# RUN: llvm-readelf -S spill | FileCheck %s --check-prefix=SPILL
+
+# SPILL: Name Type Address Off Size
+# SPILL: .first_chance PROGBITS 0000000000000000 001000 000001
+# SPILL-NEXT: .last_chance PROGBITS 0000000000000008 001008 000002
+
+
+## A spill off the end still fails the link.
+
+# RUN: not ld.lld -T spill-fail.ld spill.o 2>&1 |\
+# RUN: FileCheck %s --check-prefix=SPILL-FAIL --implicit-check-not=error:
+
+# SPILL-FAIL: error: section '.last_chance' will not fit in region 'b': overflowed by 2 bytes
+
+
+## The above spill still occurs when the LMA would overflow, even though the
+## VMA would fit.
+
+# RUN: ld.lld -T spill-lma.ld spill.o -o spill-lma
+# RUN: llvm-readelf -S spill-lma | FileCheck %s --check-prefix=SPILL-LMA
+
+# SPILL-LMA: Name Type Address Off Size
+# SPILL-LMA: .first_chance PROGBITS 0000000000000000 001000 000001
+# SPILL-LMA-NEXT: .last_chance PROGBITS 0000000000000003 001003 000002
+
+
+## A spill occurs to an additional class ref after the first.
+
+# RUN: ld.lld -T spill-later.ld spill.o -o spill-later
+# RUN: llvm-readelf -S spill-later | FileCheck %s --check-prefix=SPILL-LATER
+
+# SPILL-LATER: Name Type Address Off Size
+# SPILL-LATER: .first_chance PROGBITS 0000000000000000 001000 000001
+# SPILL-LATER-NEXT: .second_chance PROGBITS 0000000000000002 001001 000000
+# SPILL-LATER-NEXT: .last_chance PROGBITS 0000000000000003 001003 000002
+
+
+## A later overflow causes an earlier section to spill.
+
+# RUN: ld.lld -T spill-earlier.ld spill.o -o spill-earlier
+# RUN: llvm-readelf -S spill-earlier | FileCheck %s --check-prefix=SPILL-EARLIER
+
+# SPILL-EARLIER: Name Type Address Off Size
+# SPILL-EARLIER: .first_chance PROGBITS 0000000000000000 001000 000002
+# SPILL-EARLIER-NEXT: .last_chance PROGBITS 0000000000000002 001002 000001
+
+
+## SHF_MERGEd sections are spilled according to the class refs of the first
+## merged input section (the one giving the resulting section its name).
+
+# RUN: llvm-mc -n -filetype=obj -triple=x86_64 merge.s -o merge.o
+# RUN: ld.lld -T spill-merge.ld merge.o -o spill-merge
+# RUN: llvm-readelf -S spill-merge | FileCheck %s --check-prefix=SPILL-MERGE
+
+# SPILL-MERGE: Name Type Address Off Size
+# SPILL-MERGE: .first PROGBITS 0000000000000000 000190 000000
+# SPILL-MERGE-NEXT: .second PROGBITS 0000000000000001 001001 000002
+# SPILL-MERGE-NEXT: .third PROGBITS 0000000000000003 001003 000000
+
+
+## SHF_LINK_ORDER is reordered when spilling changes relative section order.
+
+# RUN: llvm-mc -n -filetype=obj -triple=x86_64 link-order.s -o link-order.o
+# RUN: ld.lld -T link-order.ld link-order.o -o link-order
+# RUN: llvm-readobj -x .order link-order | FileCheck %s --check-prefix=LINK-ORDER
+
+# LINK-ORDER: 020301
+
+
+## An error is reported when a section might spill from INSERT.
+
+# RUN: not ld.lld -T from-insert.ld spill.o 2>&1 |\
+# RUN: FileCheck %s --check-prefix=FROM-INSERT
+
+# FROM-INSERT: error: section '.two_byte_section' cannot spill from/to INSERT section '.b'
+
+
+## An error is reported when a section might spill to INSERT.
+
+# RUN: not ld.lld -T to-insert.ld spill.o 2>&1 |\
+# RUN: FileCheck %s --check-prefix=TO-INSERT
+
+# TO-INSERT: error: section '.two_byte_section' cannot spill from/to INSERT section '.b'
+
+
+## An error is reported when a section might spill from /DISCARD/.
+
+# RUN: not ld.lld -T from-discard.ld spill.o 2>&1 |\
+# RUN: FileCheck %s --check-prefix=FROM-DISCARD
+
+# FROM-DISCARD: error: section '.two_byte_section' cannot spill from/to /DISCARD/
+
+
+## An error is reported when a section might spill to /DISCARD/.
+
+# RUN: not ld.lld -T to-discard.ld spill.o 2>&1 |\
+# RUN: FileCheck %s --check-prefix=TO-DISCARD
+
+# TO-DISCARD: error: section '.two_byte_section' cannot spill from/to /DISCARD/
+
+#--- matching.s
+.section .rodata.a,"a", at progbits
+.byte 1
+
+.section .rodata.b,"a", at progbits
+.byte 2
+
+.section .rodata.c,"ax", at progbits
+.byte 3
+
+.section .rodata.d,"a", at progbits
+.byte 4
+
+#--- matching.ld
+SECTIONS {
+ CLASS(a) { *(.rodata.a) }
----------------
mysterymath wrote:
Added some clauses to the main matching test.
https://github.com/llvm/llvm-project/pull/95323
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