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clang-p2996/lld/test/wasm/data-segments.ll
Sam Clegg 1eb79e732c [lld][WebAssembly] Initialize bss segments using memory.fill 
Previously we were relying on the dynamic loader to take care of this
but it simple and correct for us to do it here instead.

Now we initialize bss segments as part of `__wasm_init_memory` at the
same time we initialize passive segments.

In addition we extent the us of `__wasm_init_memory` outside of shared
memory situations.  Specifically it is now used to initialize bss
segments when the memory is imported.

Differential Revision: https://reviews.llvm.org/D112667
2021-10-28 17:15:08 -07:00

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; RUN: llc --mtriple=wasm32-unknown-unknown -filetype=obj %s -o %t.atomics.o -mattr=+atomics
; RUN: llc --mtriple=wasm32-unknown-unknown -filetype=obj %s -o %t.bulk-mem.o -mattr=+bulk-memory
; RUN: llc --mtriple=wasm64-unknown-unknown -filetype=obj %s -o %t.bulk-mem64.o -mattr=+bulk-memory
; RUN: llc --mtriple=wasm32-unknown-unknown -filetype=obj %s -o %t.atomics.bulk-mem.o -mattr=+atomics,+bulk-memory
; RUN: llc --mtriple=wasm64-unknown-unknown -filetype=obj %s -o %t.atomics.bulk-mem64.o -mattr=+atomics,+bulk-memory
; RUN: llc --mtriple=wasm32-unknown-unknown -filetype=obj %s -o %t.atomics.bulk-mem.pic.o -relocation-model=pic -mattr=+atomics,+bulk-memory,+mutable-globals
; RUN: llc --mtriple=wasm64-unknown-unknown -filetype=obj %s -o %t.atomics.bulk-mem.pic-mem64.o -relocation-model=pic -mattr=+atomics,+bulk-memory,+mutable-globals
; atomics, shared memory => error
; RUN: not wasm-ld -no-gc-sections --no-entry --shared-memory --max-memory=131072 %t.atomics.o -o %t.atomics.wasm 2>&1 | FileCheck %s --check-prefix ERROR
; bulk memory, unshared memory => active segments
; RUN: wasm-ld -no-gc-sections --no-entry %t.bulk-mem.o -o %t.bulk-mem.wasm
; RUN: obj2yaml %t.bulk-mem.wasm | FileCheck %s --check-prefixes ACTIVE,ACTIVE32
; bulk memory, unshared memory, wasm64 => active segments
; RUN: wasm-ld -mwasm64 -no-gc-sections --no-entry %t.bulk-mem64.o -o %t.bulk-mem64.wasm
; RUN: obj2yaml %t.bulk-mem64.wasm | FileCheck %s --check-prefixes ACTIVE,ACTIVE64
; atomics, bulk memory, shared memory => passive segments
; RUN: wasm-ld -no-gc-sections --no-entry --shared-memory --max-memory=131072 %t.atomics.bulk-mem.o -o %t.atomics.bulk-mem.wasm
; RUN: obj2yaml %t.atomics.bulk-mem.wasm | FileCheck %s --check-prefix PASSIVE
; RUN: llvm-objdump --disassemble-symbols=__wasm_init_memory --no-show-raw-insn --no-leading-addr %t.atomics.bulk-mem.wasm | FileCheck %s --check-prefixes DIS,NOPIC-DIS -DPTR=i32
; atomics, bulk memory, shared memory, wasm64 => passive segments
; RUN: wasm-ld -mwasm64 -no-gc-sections --no-entry --shared-memory --max-memory=131072 %t.atomics.bulk-mem64.o -o %t.atomics.bulk-mem64.wasm
; RUN: obj2yaml %t.atomics.bulk-mem64.wasm | FileCheck %s --check-prefix PASSIVE
; RUN: llvm-objdump --disassemble-symbols=__wasm_init_memory --no-show-raw-insn --no-leading-addr %t.atomics.bulk-mem64.wasm | FileCheck %s --check-prefixes DIS,NOPIC-DIS -DPTR=i64
; Also test in combination with PIC/pie
; RUN: wasm-ld --experimental-pic -pie -no-gc-sections --no-entry --shared-memory --max-memory=131072 %t.atomics.bulk-mem.pic.o -o %t.pic.wasm
; RUN: obj2yaml %t.pic.wasm | FileCheck %s --check-prefixes PASSIVE-PIC,PASSIVE32-PIC
; RUN: llvm-objdump --disassemble-symbols=__wasm_init_memory --no-show-raw-insn --no-leading-addr %t.pic.wasm | FileCheck %s --check-prefixes DIS,PIC-DIS -DPTR=i32
; Also test in combination with PIC/pie + wasm64
; RUN: wasm-ld -mwasm64 --experimental-pic -pie -no-gc-sections --no-entry --shared-memory --max-memory=131072 %t.atomics.bulk-mem.pic-mem64.o -o %t.pic-mem64.wasm
; RUN: obj2yaml %t.pic-mem64.wasm | FileCheck %s --check-prefixes PASSIVE-PIC,PASSIVE64-PIC
; RUN: llvm-objdump --disassemble-symbols=__wasm_init_memory --no-show-raw-insn --no-leading-addr %t.pic-mem64.wasm | FileCheck %s --check-prefixes DIS,PIC-DIS -DPTR=i64
@a = hidden global [6 x i8] c"hello\00", align 1
@b = hidden global [8 x i8] c"goodbye\00", align 1
@c = hidden global [10000 x i8] zeroinitializer, align 1
@d = hidden global i32 42, align 4
@e = private constant [9 x i8] c"constant\00", align 1
@f = private constant i8 43, align 4
; ERROR: 'bulk-memory' feature must be used in order to use shared memory
; ACTIVE-LABEL: - Type: CODE
; ACTIVE-NEXT: Functions:
; ACTIVE-NEXT: - Index: 0
; ACTIVE-NEXT: Locals: []
; ACTIVE-NEXT: Body: 0B
; ACTIVE-NEXT: - Type: DATA
; ACTIVE-NEXT: Segments:
; ACTIVE-NEXT: - SectionOffset: 7
; ACTIVE-NEXT: InitFlags: 0
; ACTIVE-NEXT: Offset:
; ACTIVE32-NEXT: Opcode: I32_CONST
; ACTIVE64-NEXT: Opcode: I64_CONST
; ACTIVE-NEXT: Value: 1024
; ACTIVE-NEXT: Content: 636F6E7374616E74000000002B
; ACTIVE-NEXT: - SectionOffset: 26
; ACTIVE-NEXT: InitFlags: 0
; ACTIVE-NEXT: Offset:
; ACTIVE32-NEXT: Opcode: I32_CONST
; ACTIVE64-NEXT: Opcode: I64_CONST
; ACTIVE-NEXT: Value: 1040
; ACTIVE-NEXT: Content: 68656C6C6F00676F6F646279650000002A000000
; ACTIVE-NEXT: - Type: CUSTOM
; ACTIVE-NEXT: Name: name
; ACTIVE-NEXT: FunctionNames:
; ACTIVE-NEXT: - Index: 0
; ACTIVE-NEXT: Name: __wasm_call_ctors
; PASSIVE-LABEL: - Type: START
; PASSIVE-NEXT: StartFunction: 2
; PASSIVE-LABEL: - Type: DATACOUNT
; PASSIVE-NEXT: Count: 2
; PASSIVE-LABEL: - Type: CODE
; PASSIVE-NEXT: Functions:
; PASSIVE-NEXT: - Index: 0
; PASSIVE-NEXT: Locals: []
; PASSIVE-NEXT: Body: 0B
; PASSIVE-NEXT: - Index: 1
; PASSIVE-NEXT: Locals: []
; PASSIVE-NEXT: Body: 0B
; PASSIVE-NEXT: - Index: 2
; PASSIVE-NEXT: Locals: []
; PASSIVE-NEXT: Body: {{.*}}
; PASSIVE-NEXT: - Type: DATA
; PASSIVE-NEXT: Segments:
; PASSIVE-NEXT: - SectionOffset: 3
; PASSIVE-NEXT: InitFlags: 1
; PASSIVE-NEXT: Content: 636F6E7374616E74000000002B
; PASSIVE-NEXT: - SectionOffset: 18
; PASSIVE-NEXT: InitFlags: 1
; PASSIVE-NEXT: Content: 68656C6C6F00676F6F646279650000002A000000
; PASSIVE-NEXT: - Type: CUSTOM
; PASSIVE-NEXT: Name: name
; PASSIVE-NEXT: FunctionNames:
; PASSIVE-NEXT: - Index: 0
; PASSIVE-NEXT: Name: __wasm_call_ctors
; PASSIVE-NEXT: - Index: 1
; PASSIVE-NEXT: Name: __wasm_init_tls
; PASSIVE-NEXT: - Index: 2
; PASSIVE-NEXT: Name: __wasm_init_memory
; PASSIVE-PIC: - Type: START
; PASSIVE-PIC-NEXT: StartFunction: 2
; PASSIVE-PIC-NEXT: - Type: DATACOUNT
; PASSIVE-PIC-NEXT: Count: 2
; PASSIVE-PIC-NEXT: - Type: CODE
; PASSIVE-PIC-NEXT: Functions:
; PASSIVE-PIC-NEXT: - Index: 0
; PASSIVE-PIC-NEXT: Locals: []
; PASSIVE-PIC-NEXT: Body: 10030B
; PASSIVE-PIC-NEXT: - Index: 1
; PASSIVE-PIC-NEXT: Locals: []
; PASSIVE-PIC-NEXT: Body: 0B
; PASSIVE-PIC-NEXT: - Index: 2
; PASSIVE-PIC-NEXT: Locals:
; PASSIVE32-PIC-NEXT: - Type: I32
; PASSIVE64-PIC-NEXT: - Type: I64
; PASSIVE-PIC-NEXT: Count: 1
; PASSIVE-PIC-NEXT: Body: {{.*}}
; PASSIVE-PIC-NEXT: - Index: 3
; PASSIVE-PIC-NEXT: Locals: []
; PASSIVE-PIC-NEXT: Body: 0B
; PASSIVE-PIC-NEXT: - Type: DATA
; PASSIVE-PIC-NEXT: Segments:
; PASSIVE-PIC-NEXT: - SectionOffset: 3
; PASSIVE-PIC-NEXT: InitFlags: 1
; PASSIVE-PIC-NEXT: Content: 636F6E7374616E74000000002B
; PASSIVE-PIC-NEXT: - SectionOffset: 18
; PASSIVE-PIC-NEXT: InitFlags: 1
; PASSIVE-PIC-NEXT: Content: 68656C6C6F00676F6F646279650000002A000000
; PASSIVE-PIC-NEXT: - Type: CUSTOM
; PASSIVE-PIC-NEXT: Name: name
; PASSIVE-PIC-NEXT: FunctionNames:
; PASSIVE-PIC-NEXT: - Index: 0
; PASSIVE-PIC-NEXT: Name: __wasm_call_ctors
; PASSIVE-PIC-NEXT: - Index: 1
; PASSIVE-PIC-NEXT: Name: __wasm_init_tls
; PASSIVE-PIC-NEXT: - Index: 2
; PASSIVE-PIC-NEXT: Name: __wasm_init_memory
; PASSIVE-PIC-NEXT: - Index: 3
; PASSIVE-PIC-NEXT: Name: __wasm_apply_data_relocs
; DIS-LABEL: <__wasm_init_memory>:
; PIC-DIS: .local [[PTR]]
; PIC-DIS-NEXT: global.get 1
; PIC-DIS-NEXT: [[PTR]].const 10036
; PIC-DIS-NEXT: [[PTR]].add
; PIC-DIS-NEXT: local.set 0
; DIS: block
; DIS-NEXT: block
; DIS-NEXT: block
; NOPIC-DIS-NEXT: [[PTR]].const 11060
; PIC-DIS-NEXT: local.get 0
; DIS-NEXT: i32.const 0
; DIS-NEXT: i32.const 1
; DIS-NEXT: i32.atomic.rmw.cmpxchg 0
; DIS-NEXT: br_table {0, 1, 2} # 1: down to label1
; DIS-NEXT: # 2: down to label0
; DIS-NEXT: end
; NOPIC-DIS-NEXT: [[PTR]].const 1024
; PIC-DIS-NEXT: [[PTR]].const 0
; PIC-DIS-NEXT: global.get 1
; PIC-DIS-NEXT: [[PTR]].add
; DIS-NEXT: i32.const 0
; DIS-NEXT: i32.const 13
; DIS-NEXT: memory.init 0, 0
; NOPIC-DIS-NEXT: [[PTR]].const 1040
; PIC-DIS-NEXT: [[PTR]].const 16
; PIC-DIS-NEXT: global.get 1
; PIC-DIS-NEXT: [[PTR]].add
; DIS-NEXT: i32.const 0
; DIS-NEXT: i32.const 20
; DIS-NEXT: memory.init 1, 0
; NOPIC-DIS-NEXT: [[PTR]].const 1060
; PIC-DIS-NEXT: [[PTR]].const 36
; PIC-DIS-NEXT: global.get 1
; PIC-DIS-NEXT: [[PTR]].add
; DIS-NEXT: i32.const 0
; DIS-NEXT: i32.const 10000
; DIS-NEXT: memory.fill 0
; NOPIC-DIS-NEXT: [[PTR]].const 11060
; PIC-DIS-NEXT: local.get 0
; DIS-NEXT: i32.const 2
; DIS-NEXT: i32.atomic.store 0
; NOPIC-DIS-NEXT: [[PTR]].const 11060
; PIC-DIS-NEXT: local.get 0
; DIS-NEXT: i32.const -1
; DIS-NEXT: memory.atomic.notify 0
; DIS-NEXT: drop
; DIS-NEXT: br 1 # 1: down to label1
; DIS-NEXT: end
; NOPIC-DIS-NEXT: [[PTR]].const 11060
; PIC-DIS-NEXT: local.get 0
; DIS-NEXT: i32.const 1
; DIS-NEXT: i64.const -1
; DIS-NEXT: memory.atomic.wait32 0
; DIS-NEXT: drop
; DIS-NEXT: end
; DIS-NEXT: data.drop 0
; DIS-NEXT: data.drop 1
; DIS-NEXT: end
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