22b7b84860
Previously we would ignore all undefined symbols when using `-shared` or `-pie`. All undefined symbols would be treated as imports regardless of whether those symbols we defined in any shared library. With this change we now track symbol in shared libraries and report undefined symbols in the main program by default. The old behavior is still available via the `--unresolved-symbols=import-dynamic` command line flag. This rationale for allowing this type of breaking change is that `-pie` and `-shared` are both still experimental will warn as such, unless `--experimental-pic` is passed. As part of this change the linker now models shared library symbols via new SharedFunctionSymbol and SharedDataSymbol types. I've also added a new `--no-shlib-sigcheck` option that bypassed the checking of functions signature in shared libraries. This is specifically required by emscripten the case where the imports/exports of shared libraries have been modified by via JS type legalization (this is only needed when targeting old JS engines where bigint is not yet available See https://github.com/emscripten-core/emscripten/issues/18198
259 lines
8.1 KiB
ArmAsm
259 lines
8.1 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.o %s
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# RUN: wasm-ld --experimental-pic --unresolved-symbols=import-dynamic -shared -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,__wasm_apply_data_relocs --no-show-raw-insn --no-leading-addr %t.wasm | FileCheck %s --check-prefixes DIS
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.functype func_external () -> ()
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# Linker-synthesized globals
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.globaltype __stack_pointer, i32
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.globaltype __table_base, i32, immutable
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.globaltype __memory_base, i32, immutable
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.section .data.data,"",@
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data:
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.p2align 2
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.int32 2
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.size data, 4
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.section .data.indirect_func_external,"",@
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indirect_func_external:
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.int32 func_external
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.size indirect_func_external, 4
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.section .data.indirect_func,"",@
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indirect_func:
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.int32 foo
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.size indirect_func, 4
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# Test data relocations
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.section .data.data_addr,"",@
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data_addr:
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.int32 data
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.size data_addr, 4
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# .. against external symbols
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.section .data.data_addr_external,"",@
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data_addr_external:
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.int32 data_external
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.size data_addr_external, 4
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# .. including addends
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.section .data.extern_struct_internal_ptr,"",@
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extern_struct_internal_ptr:
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.int32 extern_struct + 4
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.size extern_struct_internal_ptr, 4
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# Test use of __stack_pointer
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.section .text,"",@
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foo:
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# %ptr = alloca i32
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# %0 = load i32, ptr @data, align 4
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# %1 = load ptr, ptr @indirect_func, align 4
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# call i32 %1()
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# ret i32 %0
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.functype foo () -> (i32)
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.local i32, i32
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global.get __stack_pointer
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i32.const 16
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i32.sub
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local.tee 0
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global.set __stack_pointer
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global.get __memory_base
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i32.const data@MBREL
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i32.add
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i32.load 0
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local.set 1
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global.get indirect_func@GOT
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i32.load 0
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call_indirect () -> (i32)
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drop
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local.get 0
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i32.const 16
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i32.add
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global.set __stack_pointer
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local.get 1
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end_function
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get_func_address:
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.functype get_func_address () -> (i32)
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global.get func_external@GOT
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end_function
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get_data_address:
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.functype get_data_address () -> (i32)
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global.get data_external@GOT
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end_function
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get_local_func_address:
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# Verify that a function which is otherwise not address taken *is* added to
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# the wasm table with referenced via R_WASM_TABLE_INDEX_REL_SLEB
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.functype get_local_func_address () -> (i32)
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global.get __table_base
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i32.const get_func_address@TBREL
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i32.add
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end_function
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.globl foo
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.globl data
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.globl indirect_func
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.globl indirect_func_external
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.globl data_addr
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.globl data_addr_external
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.globl extern_struct_internal_ptr
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.globl get_data_address
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.globl get_func_address
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.globl get_local_func_address
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.hidden foo
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.hidden data
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.hidden get_data_address
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.hidden get_func_address
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# Without this linking will fail because we import __stack_pointer (a mutable
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# global).
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# TODO(sbc): We probably want a nicer way to specify target_features section
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# in assembly.
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.section .custom_section.target_features,"",@
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.int8 1
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.int8 43
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.int8 15
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.ascii "mutable-globals"
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# check for dylink section at start
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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: 24
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# CHECK-NEXT: MemoryAlignment: 2
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# CHECK-NEXT: TableSize: 2
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# CHECK-NEXT: TableAlignment: 0
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# CHECK-NEXT: Needed: []
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# CHECK-NEXT: - Type: TYPE
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# check for import of __table_base and __memory_base globals
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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: memory
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# CHECK-NEXT: Kind: MEMORY
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# CHECK-NEXT: Memory:
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# CHECK-NEXT: Minimum: 0x1
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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: 0x2
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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-NEXT: - Module: GOT.mem
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# CHECK-NEXT: Field: indirect_func
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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: GOT.func
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# CHECK-NEXT: Field: func_external
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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: GOT.mem
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# CHECK-NEXT: Field: data_external
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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: GOT.mem
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# CHECK-NEXT: Field: extern_struct
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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: - Type: FUNCTION
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# CHECK: - Type: EXPORT
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# CHECK-NEXT: Exports:
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# CHECK-NEXT: - Name: __wasm_call_ctors
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# CHECK-NEXT: Kind: FUNCTION
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# CHECK-NEXT: Index: 0
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# check for elem segment initialized with __table_base global as offset
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# CHECK: - Type: ELEM
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# CHECK-NEXT: Segments:
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# CHECK-NEXT: - Offset:
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# CHECK-NEXT: Opcode: GLOBAL_GET
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# CHECK-NEXT: Index: 2
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# CHECK-NEXT: Functions: [ 3, 2 ]
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# check the generated code in __wasm_call_ctors and __wasm_apply_data_relocs functions
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# DIS: <__wasm_call_ctors>:
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# DIS-EMPTY:
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# DIS-NEXT: end
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# DIS: <__wasm_apply_data_relocs>:
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# DIS-EMPTY:
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# DIS-NEXT: i32.const 4
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# DIS-NEXT: global.get 1
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# DIS-NEXT: i32.add
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# DIS-NEXT: global.get 4
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# DIS-NEXT: i32.store 0
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# DIS-NEXT: i32.const 8
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# DIS-NEXT: global.get 1
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# DIS-NEXT: i32.add
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# DIS-NEXT: global.get 2
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# DIS-NEXT: i32.const 1
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# DIS-NEXT: i32.add
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# DIS-NEXT: i32.store 0
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# DIS-NEXT: i32.const 12
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# DIS-NEXT: global.get 1
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# DIS-NEXT: i32.add
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# DIS-NEXT: global.get 1
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# DIS-NEXT: i32.const 0
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# DIS-NEXT: i32.add
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# DIS-NEXT: i32.store 0
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# DIS-NEXT: i32.const 16
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# DIS-NEXT: global.get 1
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# DIS-NEXT: i32.add
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# DIS-NEXT: global.get 5
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# DIS-NEXT: i32.store 0
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# DIS-NEXT: i32.const 20
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# DIS-NEXT: global.get 1
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# DIS-NEXT: i32.add
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# DIS-NEXT: global.get 6
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# DIS-NEXT: i32.const 4
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# DIS-NEXT: i32.add
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# DIS-NEXT: i32.store 0
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# DIS-NEXT: end
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# check the data segment initialized with __memory_base global as offset
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# CHECK: - Type: DATA
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# CHECK-NEXT: Segments:
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# CHECK-NEXT: - SectionOffset: 6
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# CHECK-NEXT: InitFlags: 0
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# CHECK-NEXT: Offset:
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# CHECK-NEXT: Opcode: GLOBAL_GET
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# CHECK-NEXT: Index: 1
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# CHECK-NEXT: Content: '020000000000000001000000000000000000000000000000'
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