2021-05-02 12:18:06 +08:00
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# 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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[WebAssembly] Added initial type checker to MC Assembler
This to protect against non-sensical instruction sequences being assembled,
which would either cause asserts/crashes further down, or a Wasm module being output that doesn't validate.
Unlike a validator, this type checker is able to give type-errors as part of the parsing process, which makes the assembler much friendlier to be used by humans writing manual input.
Because the MC system is single pass (instructions aren't even stored in MC format, they are directly output) the type checker has to be single pass as well, which means that from now on .globaltype and .functype decls must come before their use. An extra pass is added to Codegen to collect information for this purpose, since AsmPrinter is normally single pass / streaming as well, and would otherwise generate this information on the fly.
A `-no-type-check` flag was added to llvm-mc (and any other tools that take asm input) that surpresses type errors, as a quick escape hatch for tests that were not intended to be type correct.
This is a first version of the type checker that ignores control flow, i.e. it checks that types are correct along the linear path, but not the branch path. This will still catch most errors. Branch checking could be added in the future.
Differential Revision: https://reviews.llvm.org/D104945
2021-06-08 03:10:47 +08:00
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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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2021-05-02 12:18:06 +08:00
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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: env
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# CHECK-NEXT: Field: func_external
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# CHECK-NEXT: Kind: FUNCTION
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# CHECK-NEXT: SigIndex: 1
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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: 1
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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: [ 4, 3 ]
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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: 1
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# CHECK-NEXT: Locals: []
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# CHECK-NEXT: Body: 10020B
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# CHECK-NEXT: - Index: 2
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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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