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llvm-project/lld/test/wasm/custom-section-name.ll

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[WebAssembly] Sort output data sections to place .bss last Summary: This was always the intended behavior, but had not been implemented. This ordering is important for Emscripten when generating .mem files while compiling to JS, since only zeros at the end of initialized memory can be dropped. Fixes https://github.com/emscripten-core/emscripten/issues/8999 Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67736 llvm-svn: 372284
2019-09-19 09:14:59 +08:00
; RUN: llc -filetype=obj %s -o %t.o
; RUN: wasm-ld -no-gc-sections --no-entry -o %t.wasm %t.o
[WebAssembly] Elide data segments for .bss sections Summary: WebAssembly memories are zero-initialized, so when module does not import its memory initializing .bss sections is guaranteed to be a no-op. To reduce binary size and initialization time, .bss sections are simply not emitted into the final binary unless the memory is imported. Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68965 llvm-svn: 374940
2019-10-16 03:05:11 +08:00
; RUN: obj2yaml %t.wasm | FileCheck %s --check-prefixes=CHECK,NO-BSS
; RUN: wasm-ld -no-gc-sections --no-entry --import-memory -o %t.bss.wasm %t.o
; RUN: obj2yaml %t.bss.wasm | FileCheck %s --check-prefixes=CHECK,BSS
[WebAssembly] Sort output data sections to place .bss last Summary: This was always the intended behavior, but had not been implemented. This ordering is important for Emscripten when generating .mem files while compiling to JS, since only zeros at the end of initialized memory can be dropped. Fixes https://github.com/emscripten-core/emscripten/issues/8999 Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67736 llvm-svn: 372284
2019-09-19 09:14:59 +08:00
; RUN: wasm-ld -no-gc-sections --no-entry -o %t_reloc.o %t.o --relocatable
; RUN: obj2yaml %t_reloc.o | FileCheck -check-prefix RELOC %s
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
@bss = hidden global i32 zeroinitializer, align 4
@foo = hidden global i32 zeroinitializer, section "WowZero!", align 4
@bar = hidden constant i32 42, section "MyAwesomeSection", align 4
@baz = hidden global i32 7, section "AnotherGreatSection", align 4
; CHECK-LABEL: - Type: DATA
; CHECK-NEXT: Segments:
; CHECK-NEXT: - SectionOffset: 7
; CHECK-NEXT: InitFlags: 0
; CHECK-NEXT: Offset:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 1024
; CHECK-NEXT: Content: '00000000'
; CHECK-NEXT: - SectionOffset: 17
; CHECK-NEXT: InitFlags: 0
; CHECK-NEXT: Offset:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 1028
; CHECK-NEXT: Content: 2A000000
; CHECK-NEXT: - SectionOffset: 27
; CHECK-NEXT: InitFlags: 0
; CHECK-NEXT: Offset:
; CHECK-NEXT: Opcode: I32_CONST
; CHECK-NEXT: Value: 1032
; CHECK-NEXT: Content: '07000000'
[WebAssembly] Elide data segments for .bss sections Summary: WebAssembly memories are zero-initialized, so when module does not import its memory initializing .bss sections is guaranteed to be a no-op. To reduce binary size and initialization time, .bss sections are simply not emitted into the final binary unless the memory is imported. Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68965 llvm-svn: 374940
2019-10-16 03:05:11 +08:00
; BSS-NEXT: - SectionOffset: 37
; BSS-NEXT: InitFlags: 0
; BSS-NEXT: Offset:
; BSS-NEXT: Opcode: I32_CONST
; BSS-NEXT: Value: 1036
; BSS-NEXT: Content: '00000000'
; NO-BSS-NOT: - SectionOffset:
[WebAssembly] Sort output data sections to place .bss last Summary: This was always the intended behavior, but had not been implemented. This ordering is important for Emscripten when generating .mem files while compiling to JS, since only zeros at the end of initialized memory can be dropped. Fixes https://github.com/emscripten-core/emscripten/issues/8999 Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67736 llvm-svn: 372284
2019-09-19 09:14:59 +08:00
; RELOC-LABEL: SegmentInfo:
; RELOC-NEXT: - Index: 0
; RELOC-NEXT: Name: 'WowZero!'
; RELOC-NEXT: Alignment: 2
; RELOC-NEXT: Flags: [ ]
; RELOC-NEXT: - Index: 1
; RELOC-NEXT: Name: MyAwesomeSection
; RELOC-NEXT: Alignment: 2
; RELOC-NEXT: Flags: [ ]
; RELOC-NEXT: - Index: 2
; RELOC-NEXT: Name: AnotherGreatSection
; RELOC-NEXT: Alignment: 2
; RELOC-NEXT: Flags: [ ]
; RELOC-NEXT: - Index: 3
; RELOC-NEXT: Name: .bss.bss
; RELOC-NEXT: Alignment: 2
; RELOC-NEXT: Flags: [ ]