1eb79e732c
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
73 lines
2.1 KiB
ArmAsm
73 lines
2.1 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.o %s
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# RUN: wasm-ld --experimental-pic -shared --shared-memory -o %t.so %t.o
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# RUN: llvm-objdump -d --no-show-raw-insn --no-leading-addr %t.so | FileCheck %s
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# RUN: obj2yaml %t.so | FileCheck %s --check-prefix=YAML
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.section .bss.foo,"",@
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.globl foo
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.p2align 2
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foo:
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.int32 0
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.size foo, 4
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.section .data.bar,"",@
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.globl bar
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.p2align 2
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bar:
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.int32 42
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.size bar, 4
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.section .custom_section.target_features,"",@
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.int8 2
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.int8 43
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.int8 7
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.ascii "atomics"
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.int8 43
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.int8 11
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.ascii "bulk-memory"
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# Verify that there is only a single data segment and no bss
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# in the binary:
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# YAML: - Type: DATA{{$}}
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# YAML-NEXT: Segments:
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# YAML-NEXT: - SectionOffset: 3
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# YAML-NEXT: InitFlags: 1
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# YAML-NEXT: Content: 2A000000
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# YAML-NEXT: - Type: CUSTOM
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# CHECK: <__wasm_init_memory>:
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# CHECK-NEXT: .local i32
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# CHECK-NEXT: global.get 0
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# CHECK-NEXT: i32.const 8
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# CHECK-NEXT: i32.add
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# CHECK-NEXT: local.set 0
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# CHECK-NEXT: block
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# CHECK-NEXT: block
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# CHECK-NEXT: block
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# CHECK-NEXT: local.get 0
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: i32.const 1
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# CHECK-NEXT: i32.atomic.rmw.cmpxchg 0
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# CHECK-NEXT: br_table {0, 1, 2} # 1: down to label1
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# CHECK-NEXT: # 2: down to label0
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# CHECK-NEXT: end
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# Regular data gets initialized with memory.init
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: global.get 0
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# CHECK-NEXT: i32.add
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: i32.const 4
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# CHECK-NEXT: memory.init 0, 0
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# BSS gets initialized with memory.fill
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# CHECK-NEXT: i32.const 4
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# CHECK-NEXT: global.get 0
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# CHECK-NEXT: i32.add
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: i32.const 4
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# CHECK-NEXT: memory.fill 0
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