e4888be74e
In PIC mode we import function address via `GOT.mem` imports but for direct function calls we still import the first class function. However, if the function is never directly called we can avoid the first class import completely. Differential Revision: https://reviews.llvm.org/D108345
229 lines
6.9 KiB
ArmAsm
229 lines
6.9 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 -o %t.wasm %t.o
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# RUN: obj2yaml %t.wasm | FileCheck %s
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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, 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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.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
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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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# TODO(sbc): Disassemble and verify instructions.
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# CHECK: - Type: CODE
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# CHECK-NEXT: Functions:
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# CHECK-NEXT: - Index: 0
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# CHECK-NEXT: Locals: []
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# CHECK-NEXT: Body: 10010B
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# CHECK-NEXT: - Index: 1
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# CHECK-NEXT: Locals: []
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# CHECK-NEXT: Body: 230141046A2304360200230141086A230241016A3602002301410C6A230141006A360200230141106A2305360200230141146A230641046A3602000B
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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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