457f38a7b0
Back in https://reviews.llvm.org/D117412 we moved the application of data reloctions to the wasm start function. However, because the dynamic linker doesn't know the final addresses at module instantiation time, this proved to be too early and the relocations could be applied with the wrong values. Fixes: https://github.com/emscripten-core/emscripten/issues/17150 Differential Revision: https://reviews.llvm.org/D127333
183 lines
7.3 KiB
LLVM
183 lines
7.3 KiB
LLVM
; RUN: llc -relocation-model=pic -mattr=+mutable-globals -filetype=obj %s -o %t.o
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; RUN: wasm-ld --no-gc-sections --experimental-pic -pie -o %t.wasm %t.o
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; RUN: obj2yaml %t.wasm | FileCheck %s
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; RUN: llvm-objdump --disassemble-symbols=__wasm_call_ctors --no-show-raw-insn --no-leading-addr %t.wasm | FileCheck %s --check-prefixes DISASSEM
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target triple = "wasm32-unknown-emscripten"
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@data = global i32 2, align 4
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@data_external = external global i32
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@indirect_func = local_unnamed_addr global i32 ()* @foo, align 4
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@data_addr = local_unnamed_addr global i32* @data, align 4
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@data_addr_external = local_unnamed_addr global i32* @data_external, align 4
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define hidden i32 @foo() {
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entry:
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; To ensure we use __stack_pointer
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%ptr = alloca i32
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%0 = load i32, i32* @data, align 4
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%1 = load i32 ()*, i32 ()** @indirect_func, align 4
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call i32 %1()
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ret i32 %0
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}
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define default i32** @get_data_address() {
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entry:
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ret i32** @data_addr_external
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}
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define void @_start() {
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call void @external_func()
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ret void
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}
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declare void @external_func()
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; CHECK: Sections:
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; CHECK-NEXT: - Type: CUSTOM
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; CHECK-NEXT: Name: dylink.0
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; CHECK-NEXT: MemorySize: 16
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; CHECK-NEXT: MemoryAlignment: 2
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; CHECK-NEXT: TableSize: 1
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; CHECK-NEXT: TableAlignment: 0
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; CHECK-NEXT: Needed: []
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; CHECK: - Type: IMPORT
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; CHECK-NEXT: Imports:
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; CHECK-NEXT: - Module: env
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; CHECK-NEXT: Field: __indirect_function_table
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; CHECK-NEXT: Kind: TABLE
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; CHECK-NEXT: Table:
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; CHECK-NEXT: Index: 0
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; CHECK-NEXT: ElemType: FUNCREF
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; CHECK-NEXT: Limits:
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; CHECK-NEXT: Minimum: 0x1
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; CHECK-NEXT: - Module: env
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; CHECK-NEXT: Field: __stack_pointer
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; CHECK-NEXT: Kind: GLOBAL
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; CHECK-NEXT: GlobalType: I32
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; CHECK-NEXT: GlobalMutable: true
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; CHECK-NEXT: - Module: env
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; CHECK-NEXT: Field: __memory_base
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; CHECK-NEXT: Kind: GLOBAL
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; CHECK-NEXT: GlobalType: I32
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; CHECK-NEXT: GlobalMutable: false
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; CHECK-NEXT: - Module: env
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; CHECK-NEXT: Field: __table_base
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; CHECK-NEXT: Kind: GLOBAL
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; CHECK-NEXT: GlobalType: I32
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; CHECK-NEXT: GlobalMutable: false
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; CHECK: - Type: START
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; CHECK-NEXT: StartFunction: 3
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; CHECK: - Type: CUSTOM
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; CHECK-NEXT: Name: name
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; CHECK-NEXT: FunctionNames:
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; CHECK-NEXT: - Index: 0
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; CHECK-NEXT: Name: external_func
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; CHECK-NEXT: - Index: 1
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; CHECK-NEXT: Name: __wasm_call_ctors
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; CHECK-NEXT: - Index: 2
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; CHECK-NEXT: Name: __wasm_apply_data_relocs
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; CHECK-NEXT: - Index: 3
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; CHECK-NEXT: Name: __wasm_apply_global_relocs
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; CHECK-NEXT: - Index: 4
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; CHECK-NEXT: Name: foo
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; CHECK-NEXT: - Index: 5
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; CHECK-NEXT: Name: get_data_address
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; CHECK-NEXT: - Index: 6
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; CHECK-NEXT: Name: _start
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; CHECK-NEXT: GlobalNames:
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; DISASSEM: <__wasm_call_ctors>:
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; DISASSEM-EMPTY:
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; DISASSEM-NEXT: call 2
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; DISASSEM-NEXT: end
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; Run the same test with extended-const support. When this is available
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; we don't need __wasm_apply_global_relocs and instead rely on the add
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; instruction in the InitExpr. We also, therefore, do not need these globals
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; to be mutable.
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; RUN: llc -relocation-model=pic -mattr=+extended-const,+mutable-globals,+atomics,+bulk-memory -filetype=obj %s -o %t.extended.o
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; RUN: wasm-ld --no-gc-sections --allow-undefined --experimental-pic -pie -o %t.extended.wasm %t.extended.o
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; RUN: obj2yaml %t.extended.wasm | FileCheck %s --check-prefix=EXTENDED-CONST
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; EXTENDED-CONST-NOT: __wasm_apply_global_relocs
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; EXTENDED-CONST: - Type: GLOBAL
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; EXTENDED-CONST-NEXT: Globals:
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; EXTENDED-CONST-NEXT: - Index: 4
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; EXTENDED-CONST-NEXT: Type: I32
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; EXTENDED-CONST-NEXT: Mutable: false
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; EXTENDED-CONST-NEXT: InitExpr:
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; EXTENDED-CONST-NEXT: Opcode: GLOBAL_GET
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; EXTENDED-CONST-NEXT: Index: 1
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; EXTENDED-CONST-NEXT: - Index: 5
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; EXTENDED-CONST-NEXT: Type: I32
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; EXTENDED-CONST-NEXT: Mutable: false
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; EXTENDED-CONST-NEXT: InitExpr:
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; EXTENDED-CONST-NEXT: Extended: true
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; EXTENDED-CONST-NEXT: Body: 230141046A0B
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; EXTENDED-CONST-NEXT: - Index: 6
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; EXTENDED-CONST-NEXT: Type: I32
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; EXTENDED-CONST-NEXT: Mutable: false
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; EXTENDED-CONST-NEXT: InitExpr:
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; EXTENDED-CONST-NEXT: Extended: true
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; This instruction sequence decodes to:
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; (global.get[0x23] 0x1 i32.const[0x41] 0x0C i32.add[0x6A] end[0x0b])
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; EXTENDED-CONST-NEXT: Body: 2301410C6A0B
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; EXTENDED-CONST-NOT: - Type: START
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; EXTENDED-CONST: FunctionNames:
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; EXTENDED-CONST-NEXT: - Index: 0
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; EXTENDED-CONST-NEXT: Name: external_func
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; EXTENDED-CONST-NEXT: - Index: 1
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; EXTENDED-CONST-NEXT: Name: __wasm_call_ctors
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; EXTENDED-CONST-NEXT: - Index: 2
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; EXTENDED-CONST-NEXT: Name: __wasm_apply_data_relocs
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; Run the same test with threading support. In this mode
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; we expect __wasm_init_memory and __wasm_apply_data_relocs
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; to be generated along with __wasm_start as the start
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; function.
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; RUN: llc -relocation-model=pic -mattr=+mutable-globals,+atomics,+bulk-memory -filetype=obj %s -o %t.shmem.o
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; RUN: wasm-ld --no-gc-sections --shared-memory --allow-undefined --experimental-pic -pie -o %t.shmem.wasm %t.shmem.o
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; RUN: obj2yaml %t.shmem.wasm | FileCheck %s --check-prefix=SHMEM
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; RUN: llvm-objdump --disassemble-symbols=__wasm_start --no-show-raw-insn --no-leading-addr %t.shmem.wasm | FileCheck %s --check-prefix DISASSEM-SHMEM
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; SHMEM: - Type: START
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; SHMEM-NEXT: StartFunction: 6
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; DISASSEM-SHMEM: <__wasm_start>:
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; DISASSEM-SHMEM-EMPTY:
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; DISASSEM-SHMEM-NEXT: call 5
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; DISASSEM-SHMEM-NEXT: call 3
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; DISASSEM-SHMEM-NEXT: end
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; SHMEM: FunctionNames:
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; SHMEM-NEXT: - Index: 0
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; SHMEM-NEXT: Name: external_func
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; SHMEM-NEXT: - Index: 1
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; SHMEM-NEXT: Name: __wasm_call_ctors
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; SHMEM-NEXT: - Index: 2
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; SHMEM-NEXT: Name: __wasm_init_tls
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; SHMEM-NEXT: - Index: 3
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; SHMEM-NEXT: Name: __wasm_init_memory
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; SHMEM-NEXT: - Index: 4
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; SHMEM-NEXT: Name: __wasm_apply_data_relocs
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; SHMEM-NEXT: - Index: 5
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; SHMEM-NEXT: Name: __wasm_apply_global_relocs
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; SHMEM-NEXT: - Index: 6
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; SHMEM-NEXT: Name: __wasm_start
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; SHMEM-NEXT: - Index: 7
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; SHMEM-NEXT: Name: foo
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; SHMEM-NEXT: - Index: 8
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; SHMEM-NEXT: Name: get_data_address
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; SHMEM-NEXT: - Index: 9
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; SHMEM-NEXT: Name: _start
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