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[lld][WebAssembly] Implement various thinlto flags (#114327)
The changes in this PR (both in the code and the tests) are largely copied directly from the ELF linker. Partial fix for #79604.
1 parent 80b9f07 commit 9a450a0

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+437
-58
lines changed

‎lld/test/wasm/lto/Inputs/thinlto_empty.ll

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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-unknown"

‎lld/test/wasm/lto/obj-path.ll

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;; Copied from testr/ELF/lto/obj-path.ll
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;; Test --lto-obj-path= for regular LTO.
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; RUN: rm -rf %t && split-file %s %t && cd %t
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; RUN: mkdir d
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; RUN: opt 1.ll -o 1.bc
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; RUN: opt 2.ll -o d/2.bc
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; RUN: rm -f objpath.o
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; RUN: wasm-ld --lto-obj-path=objpath.o -shared 1.bc d/2.bc -o 3
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; RUN: llvm-nm 3 | FileCheck %s --check-prefix=NM
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; RUN: llvm-objdump -d objpath.o | FileCheck %s
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; RUN: ls 3* objpath* | count 2
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; RUN: rm -f 3 objpath.o
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; RUN: wasm-ld --thinlto-index-only=3.txt --lto-obj-path=objpath.o -shared 1.bc d/2.bc -o 3
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; RUN: llvm-objdump -d objpath.o | FileCheck %s
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; RUN: not ls 3
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; NM: T f
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; NM: T g
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; CHECK: file format wasm
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; CHECK: <f>:
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; CHECK: <g>:
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;; Test --lto-obj-path= for ThinLTO.
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; RUN: opt -module-summary 1.ll -o 1.bc
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; RUN: opt -module-summary 2.ll -o d/2.bc
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; RUN: wasm-ld --lto-obj-path=objpath.o -shared 1.bc d/2.bc -o 3
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; RUN: llvm-nm 3 | FileCheck %s --check-prefix=NM3
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; RUN: llvm-objdump -d objpath.o1 | FileCheck %s --check-prefix=CHECK1
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; RUN: llvm-objdump -d objpath.o2 | FileCheck %s --check-prefix=CHECK2
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; NM3: T f
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; NM3-NEXT: T g
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; CHECK1: file format wasm
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; CHECK1-EMPTY:
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; CHECK1-NEXT: Disassembly of section CODE:
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; CHECK1: <f>:
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; CHECK1-EMPTY:
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; CHECK1-NEXT: end
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; CHECK1-NOT: {{.}}
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; CHECK2: file format wasm
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; CHECK2-EMPTY:
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; CHECK2-NEXT: Disassembly of section CODE:
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; CHECK2: <g>:
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; CHECK2-EMPTY:
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; CHECK2-NEXT: end
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; CHECK2-NOT: {{.}}
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;; With --thinlto-index-only, --lto-obj-path= creates just one file.
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; RUN: rm -f objpath.o objpath.o1 objpath.o2
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; RUN: wasm-ld --thinlto-index-only --lto-obj-path=objpath.o -shared 1.bc d/2.bc -o /dev/null
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; RUN: llvm-objdump -d objpath.o | FileCheck %s --check-prefix=EMPTY
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; RUN: not ls objpath.o1
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; RUN: not ls objpath.o2
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;; Ensure lld emits empty combined module if specific obj-path.
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; RUN: mkdir obj
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; RUN: wasm-ld --lto-obj-path=objpath.o -shared 1.bc d/2.bc -o obj/out --save-temps
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; RUN: ls obj/out.lto.o out.lto.1.o d/out.lto.2.o
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;; Ensure lld does not emit empty combined module by default.
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; RUN: rm -fr obj && mkdir obj
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; RUN: wasm-ld -shared 1.bc d/2.bc -o obj/out --save-temps
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; RUN: not test -e obj/out.lto.o
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; EMPTY: file format wasm
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; EMPTY-NOT: {{.}}
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;--- 1.ll
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-unknown"
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declare void @g(...)
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define void @f() {
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entry:
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call void (...) @g()
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ret void
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}
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;--- 2.ll
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-unknown"
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define void @g() {
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entry:
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ret void
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}

‎lld/test/wasm/lto/parallel.ll

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1,8 +1,8 @@
1-
; RUN: llvm-as -o %t.bc %s
2-
; RUN: rm -f %t.lto.o %t1.lto.o
3-
; RUN: wasm-ld --lto-partitions=2 -save-temps -o %t %t.bc -r
4-
; RUN: llvm-nm %t.lto.o | FileCheck --check-prefix=CHECK0 %s
5-
; RUN: llvm-nm %t1.lto.o | FileCheck --check-prefix=CHECK1 %s
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; RUN: rm -rf %t && mkdir %t && cd %t
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; RUN: llvm-as -o a.bc %s
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; RUN: wasm-ld --lto-partitions=2 -save-temps -o out a.bc -r
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; RUN: llvm-nm out.lto.o | FileCheck --check-prefix=CHECK0 %s
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; RUN: llvm-nm out.lto.1.o | FileCheck --check-prefix=CHECK1 %s
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-unknown-wasm"

‎lld/test/wasm/lto/thinlto-index-only.ll

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; RUN: rm -rf %t && split-file %s %t && cd %t
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; RUN: mkdir d
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;; First ensure that the ThinLTO handling in lld handles
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;; bitcode without summary sections gracefully and generates index file.
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; RUN: llvm-as 1.ll -o 1.o
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; RUN: llvm-as %p/Inputs/thinlto.ll -o d/2.o
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; RUN: wasm-ld --thinlto-index-only -shared 1.o d/2.o -o 3
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; RUN: ls d/2.o.thinlto.bc
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; RUN: not test -e 3
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; RUN: wasm-ld -shared 1.o d/2.o -o 3
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; RUN: llvm-nm 3 | FileCheck %s --check-prefix=NM
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;; Basic ThinLTO tests.
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; RUN: llvm-as 0.ll -o 0.o
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; RUN: opt -module-summary 1.ll -o 1.o
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; RUN: opt -module-summary %p/Inputs/thinlto.ll -o d/2.o
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; RUN: opt -module-summary %p/Inputs/thinlto_empty.ll -o 3.o
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; RUN: cp 3.o 4.o
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;; Ensure lld doesn't generates index files when --thinlto-index-only is not enabled.
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; RUN: rm -f 1.o.thinlto.bc d/2.o.thinlto.bc
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; RUN: wasm-ld -shared 1.o d/2.o -o /dev/null
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; RUN: not ls 1.o.thinlto.bc
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; RUN: not ls d/2.o.thinlto.bc
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;; Ensure lld generates an index and not a binary if requested.
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; RUN: wasm-ld --thinlto-index-only -shared 1.o --start-lib d/2.o 3.o --end-lib 4.o -o 4
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; RUN: not test -e 4
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; RUN: llvm-bcanalyzer -dump 1.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND1
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; RUN: llvm-bcanalyzer -dump d/2.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND2
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; RUN: llvm-dis < 3.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND3
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; RUN: llvm-dis < 4.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND4
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; RUN: rm -f 1.o.thinlto.bc d/2.o.thinlto.bc 3.o.thinlto.bc 4.o.thinlto.bc
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; RUN: wasm-ld --thinlto-index-only=4.txt --thinlto-emit-imports-files -shared 1.o --start-lib d/2.o 3.o --end-lib 4.o -o 4
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; RUN: not test -e 4
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; RUN: FileCheck %s --check-prefix=RSP --implicit-check-not={{.}} < 4.txt
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; RUN: llvm-bcanalyzer -dump 1.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND1
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; RUN: llvm-bcanalyzer -dump d/2.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND2
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; RUN: llvm-dis < 3.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND3
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; RUN: llvm-dis < 4.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND4
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; RUN: FileCheck %s --check-prefix=IMPORTS1 --implicit-check-not={{.}} < 1.o.imports
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; RUN: count 0 < d/2.o.imports
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;; Test that LLD generates an empty index even for lazy object file that is not added to link.
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; RUN: count 0 < 3.o.imports
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; RUN: count 0 < 4.o.imports
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;; Test interaction with --save-temps.
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; RUN: rm -f 4.txt 1.o.thinlto.bc d/2.o.thinlto.bc 3.o.thinlto.bc 4.o.thinlto.bc
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; RUN: wasm-ld --thinlto-index-only=4.txt --thinlto-emit-imports-files --save-temps -shared 0.o 1.o --start-lib d/2.o 3.o --end-lib 4.o -o t
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; RUN: not test -e 4
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; RUN: FileCheck %s --check-prefix=RSP --implicit-check-not={{.}} < 4.txt
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; RUN: llvm-bcanalyzer -dump 1.o.thinlto.bc | FileCheck %s --check-prefix=BACKEND1
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; RUN: FileCheck %s --check-prefix=IMPORTS1 --implicit-check-not={{.}} < 1.o.imports
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; RUN: FileCheck %s --check-prefix=RESOLUTION < t.resolution.txt
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; RUN: llvm-dis < t.index.bc | FileCheck %s --check-prefix=INDEX-BC
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; RSP: 1.o
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; RSP-NEXT: d/2.o
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; RSP-NEXT: 4.o
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; IMPORTS1: d/2.o
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; RESOLUTION: 0.o
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; RESOLUTION-NEXT: -r=0.o,foo,px
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; RESOLUTION-NEXT: 1.o
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; INDEX-BC: ^0 = module: (path: "1.o", hash: (0, 0, 0, 0, 0))
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; INDEX-BC-NEXT: ^1 = module: (path: "4.o", hash: (0, 0, 0, 0, 0))
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; INDEX-BC-NEXT: ^2 = module: (path: "d/2.o", hash: (0, 0, 0, 0, 0))
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;; Ensure LLD generates an empty index for each bitcode file even if all bitcode files are lazy.
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; RUN: rm -f 1.o.thinlto.bc
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; RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown /dev/null -o dummy.o
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; RUN: wasm-ld --thinlto-index-only -shared dummy.o --start-lib 1.o --end-lib -o /dev/null
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; RUN: ls 1.o.thinlto.bc
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;; Ensure when the same bitcode object is given as both lazy and non-lazy,
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;; LLD does not generate an empty index for the lazy object.
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; RUN: rm -f d/2.o.thinlto.bc
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; RUN: wasm-ld --thinlto-index-only -shared 1.o d/2.o --start-lib d/2.o --end-lib -o /dev/null
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; RUN: llvm-dis < d/2.o.thinlto.bc | grep -q '\^0 = module:'
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; RUN: rm -f d/2.o.thinlto.bc
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; RUN: wasm-ld --thinlto-index-only -shared --start-lib d/2.o --end-lib d/2.o 1.o -o /dev/null
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; RUN: llvm-dis < d/2.o.thinlto.bc | grep -q '\^0 = module:'
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;; Ensure when the same lazy bitcode object is given multiple times,
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;; no empty index file is generated if one of the copies is linked.
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; RUN: rm -f d/2.o.thinlto.bc
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; RUN: wasm-ld --thinlto-index-only -shared 1.o --start-lib d/2.o --end-lib --start-lib d/2.o --end-lib -o /dev/null
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; RUN: llvm-dis < d/2.o.thinlto.bc | grep -q '\^0 = module:'
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; NM: T f
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;; The backend index for this module contains summaries from itself and
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;; Inputs/thinlto.ll, as it imports from the latter.
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; BACKEND1: <MODULE_STRTAB_BLOCK
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; BACKEND1-NEXT: <ENTRY {{.*}} record string = '1.o'
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; BACKEND1-NEXT: <ENTRY {{.*}} record string = 'd/2.o'
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; BACKEND1-NEXT: </MODULE_STRTAB_BLOCK
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; BACKEND1: <GLOBALVAL_SUMMARY_BLOCK
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; BACKEND1: <VERSION
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; BACKEND1: <FLAGS
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; BACKEND1: <VALUE_GUID {{.*}} op0={{1|2}} {{op1=3060885059 op2=1207956914|op1=3432075125 op2=3712786831}}
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; BACKEND1: <VALUE_GUID {{.*}} op0={{1|2}} {{op1=3060885059 op2=1207956914|op1=3432075125 op2=3712786831}}
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; BACKEND1: <COMBINED
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; BACKEND1: <COMBINED
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; BACKEND1: </GLOBALVAL_SUMMARY_BLOCK
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;; The backend index for Input/thinlto.ll contains summaries from itself only,
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;; as it does not import anything.
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; BACKEND2: <MODULE_STRTAB_BLOCK
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; BACKEND2-NEXT: <ENTRY {{.*}} record string = 'd/2.o'
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; BACKEND2-NEXT: </MODULE_STRTAB_BLOCK
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; BACKEND2-NEXT: <GLOBALVAL_SUMMARY_BLOCK
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; BACKEND2-NEXT: <VERSION
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; BACKEND2-NEXT: <FLAGS
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; BACKEND2-NEXT: <VALUE_GUID {{.*}} op0=1 op1=3060885059 op2=1207956914
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; BACKEND2-NEXT: <COMBINED
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; BACKEND2-NEXT: </GLOBALVAL_SUMMARY_BLOCK
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; BACKEND3: ^0 = flags:
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; BACKEND4: ^0 = module: (path: "4.o", hash: (0, 0, 0, 0, 0))
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;--- 0.ll
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-unknown"
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define void @foo() {
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ret void
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}
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;--- 1.ll
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-unknown"
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declare void @g(...)
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define void @f() {
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entry:
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call void (...) @g()
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ret void
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}

‎lld/test/wasm/lto/thinlto.ll

Lines changed: 35 additions & 32 deletions
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@@ -1,53 +1,56 @@
11
; Basic ThinLTO tests.
2-
; RUN: opt -module-summary %s -o %t1.o
3-
; RUN: opt -module-summary %p/Inputs/thinlto.ll -o %t2.o
2+
; RUN: rm -rf %t && mkdir %t && cd %t
3+
; RUN: mkdir d e
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; RUN: opt -module-summary %s -o a.o
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; RUN: opt -module-summary %p/Inputs/thinlto.ll -o d/b.o
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58
; First force single-threaded mode
6-
; RUN: rm -f %t31.lto.o %t32.lto.o
7-
; RUN: wasm-ld -r -save-temps --thinlto-jobs=1 %t1.o %t2.o -o %t3
8-
; RUN: llvm-nm %t31.lto.o | FileCheck %s --check-prefix=NM1
9-
; RUN: llvm-nm %t32.lto.o | FileCheck %s --check-prefix=NM2
9+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
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; RUN: wasm-ld -r -save-temps --thinlto-jobs=1 a.o d/b.o -o e/out
11+
; RUN: llvm-nm out.lto.a.o | FileCheck %s --check-prefix=NM1
12+
; RUN: llvm-nm d/out.lto.b.o | FileCheck %s --check-prefix=NM2
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1114
; Next force multi-threaded mode
12-
; RUN: rm -f %t31.lto.o %t32.lto.o
13-
; RUN: wasm-ld -r -save-temps --thinlto-jobs=2 %t1.o %t2.o -o %t3
14-
; RUN: llvm-nm %t31.lto.o | FileCheck %s --check-prefix=NM1
15-
; RUN: llvm-nm %t32.lto.o | FileCheck %s --check-prefix=NM2
15+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
16+
; RUN: wasm-ld -r -save-temps --thinlto-jobs=2 a.o d/b.o -o e/out
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; RUN: llvm-nm out.lto.a.o | FileCheck %s --check-prefix=NM1
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; RUN: llvm-nm d/out.lto.b.o | FileCheck %s --check-prefix=NM2
1619

1720
;; --thinlto-jobs= defaults to --threads=.
18-
; RUN: rm -f %t31.lto.o %t32.lto.o
19-
; RUN: wasm-ld -r -save-temps --threads=2 %t1.o %t2.o -o %t3
20-
; RUN: llvm-nm %t31.lto.o | FileCheck %s --check-prefix=NM1
21-
; RUN: llvm-nm %t32.lto.o | FileCheck %s --check-prefix=NM2
21+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
22+
; RUN: wasm-ld -r -save-temps --threads=2 a.o d/b.o -o e/out
23+
; RUN: llvm-nm out.lto.a.o | FileCheck %s --check-prefix=NM1
24+
; RUN: llvm-nm d/out.lto.b.o | FileCheck %s --check-prefix=NM2
2225

2326
;; --thinlto-jobs= overrides --threads=.
24-
; RUN: rm -f %t31.lto.o %t32.lto.o
25-
; RUN: wasm-ld -r -save-temps --threads=1 --thinlto-jobs=2 %t1.o %t2.o -o %t3
26-
; RUN: llvm-nm %t31.lto.o | FileCheck %s --check-prefix=NM1
27-
; RUN: llvm-nm %t32.lto.o | FileCheck %s --check-prefix=NM2
27+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
28+
; RUN: wasm-ld -r -save-temps --threads=1 --thinlto-jobs=2 a.o d/b.o -o e/out
29+
; RUN: llvm-nm out.lto.a.o | FileCheck %s --check-prefix=NM1
30+
; RUN: llvm-nm d/out.lto.b.o | FileCheck %s --check-prefix=NM2
2831

2932
; Test with all threads, on all cores, on all CPU sockets
30-
; RUN: rm -f %t31.lto.o %t32.lto.o
31-
; RUN: wasm-ld -r -save-temps --thinlto-jobs=all %t1.o %t2.o -o %t3
32-
; RUN: llvm-nm %t31.lto.o | FileCheck %s --check-prefix=NM1
33-
; RUN: llvm-nm %t32.lto.o | FileCheck %s --check-prefix=NM2
33+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
34+
; RUN: wasm-ld -r -save-temps --thinlto-jobs=all a.o d/b.o -o e/out
35+
; RUN: llvm-nm out.lto.a.o | FileCheck %s --check-prefix=NM1
36+
; RUN: llvm-nm d/out.lto.b.o | FileCheck %s --check-prefix=NM2
3437

3538
; Test with many more threads than the system has
36-
; RUN: rm -f %t31.lto.o %t32.lto.o
37-
; RUN: wasm-ld -r -save-temps --thinlto-jobs=100 %t1.o %t2.o -o %t3
38-
; RUN: llvm-nm %t31.lto.o | FileCheck %s --check-prefix=NM1
39-
; RUN: llvm-nm %t32.lto.o | FileCheck %s --check-prefix=NM2
39+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
40+
; RUN: wasm-ld -r -save-temps --thinlto-jobs=100 a.o d/b.o -o e/out
41+
; RUN: llvm-nm out.lto.a.o | FileCheck %s --check-prefix=NM1
42+
; RUN: llvm-nm d/out.lto.b.o | FileCheck %s --check-prefix=NM2
4043

4144
; Test with a bad value
42-
; RUN: rm -f %t31.lto.o %t32.lto.o
43-
; RUN: not wasm-ld -r -save-temps --thinlto-jobs=foo %t1.o %t2.o -o %t3 2>&1 | FileCheck %s --check-prefix=BAD-JOBS
45+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
46+
; RUN: not wasm-ld -r -save-temps --thinlto-jobs=foo a.o d/b.o -o e/out 2>&1 | FileCheck %s --check-prefix=BAD-JOBS
4447
; BAD-JOBS: error: --thinlto-jobs: invalid job count: foo
4548

4649
; Check without --thinlto-jobs (which currently defaults to heavyweight_hardware_concurrency, meanning one thread per hardware core -- not SMT)
47-
; RUN: rm -f %t31.lto.o %t32.lto.o
48-
; RUN: wasm-ld -r -save-temps %t1.o %t2.o -o %t3
49-
; RUN: llvm-nm %t31.lto.o | FileCheck %s --check-prefix=NM1
50-
; RUN: llvm-nm %t32.lto.o | FileCheck %s --check-prefix=NM2
50+
; RUN: rm -f out.lto.a.o d/out.lto.b.o
51+
; RUN: wasm-ld -r -save-temps a.o d/b.o -o e/out
52+
; RUN: llvm-nm out.lto.a.o | FileCheck %s --check-prefix=NM1
53+
; RUN: llvm-nm d/out.lto.b.o | FileCheck %s --check-prefix=NM2
5154

5255
; NM1: T f
5356
; NM2: T g

‎lld/wasm/CMakeLists.txt

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -21,6 +21,7 @@ add_lld_library(lldWasm
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LINK_COMPONENTS
2222
${LLVM_TARGETS_TO_BUILD}
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BinaryFormat
24+
BitWriter
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Core
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Demangle
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LTO

‎lld/wasm/Config.h

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -79,6 +79,9 @@ struct Configuration {
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// Because dyamanic linking under Wasm is still experimental we default to
8080
// static linking
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bool isStatic = true;
82+
bool thinLTOEmitImportsFiles;
83+
bool thinLTOEmitIndexFiles;
84+
bool thinLTOIndexOnly;
8285
bool trace;
8386
uint64_t globalBase;
8487
uint64_t initialHeap;
@@ -95,16 +98,18 @@ struct Configuration {
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unsigned ltoo;
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llvm::CodeGenOptLevel ltoCgo;
97100
unsigned optimize;
98-
llvm::StringRef thinLTOJobs;
99101
bool ltoDebugPassManager;
100102
UnresolvedPolicy unresolvedSymbols;
101103
BuildIdKind buildId = BuildIdKind::None;
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llvm::StringRef entry;
106+
llvm::StringRef ltoObjPath;
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llvm::StringRef mapFile;
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llvm::StringRef outputFile;
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llvm::StringRef soName;
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llvm::StringRef thinLTOCacheDir;
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llvm::StringRef thinLTOJobs;
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llvm::StringRef thinLTOIndexOnlyArg;
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llvm::StringRef whyExtract;
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llvm::StringSet<> allowUndefinedSymbols;
@@ -126,6 +131,7 @@ struct Ctx {
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llvm::SmallVector<StubFile *, 0> stubFiles;
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llvm::SmallVector<SharedFile *, 0> sharedFiles;
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llvm::SmallVector<BitcodeFile *, 0> bitcodeFiles;
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llvm::SmallVector<BitcodeFile *, 0> lazyBitcodeFiles;
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llvm::SmallVector<InputFunction *, 0> syntheticFunctions;
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llvm::SmallVector<InputGlobal *, 0> syntheticGlobals;
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llvm::SmallVector<InputTable *, 0> syntheticTables;

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