9647a6f719
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
97 lines
3.3 KiB
ArmAsm
97 lines
3.3 KiB
ArmAsm
# Checks handling of undefined weak external functions. When the
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# static linker decides they are undefined, check GOT relocations
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# resolve to zero (i.e. a global that contains zero.).
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#
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# RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.o %s
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# RUN: wasm-ld %t.o -o %t1.wasm
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# RUN: obj2yaml %t1.wasm | FileCheck %s
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#
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# With `--unresolved-symbols=ignore-all` the behaviour should be the same
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# as the default.>
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#
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# RUN: wasm-ld --unresolved-symbols=ignore-all %t.o -o %t2.wasm
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# RUN: obj2yaml %t2.wasm | FileCheck %s
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.functype foo () -> (i32)
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.globl get_foo_addr
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get_foo_addr:
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.functype get_foo_addr () -> (i32)
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global.get foo@GOT
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end_function
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.globl _start
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_start:
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.functype _start () -> (i32)
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call get_foo_addr
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call foo
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drop
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end_function
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.weak foo
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# Verify that we do not generate dynamic relocations for the GOT entry.
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# CHECK-NOT: __wasm_apply_global_relocs
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# Verify that we do not generate an import for foo
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# CHECK-NOT: - Type: IMPORT
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# CHECK: - Type: GLOBAL
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# CHECK-NEXT: Globals:
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# CHECK-NEXT: - Index: 0
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# CHECK-NEXT: Type: I32
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# CHECK-NEXT: Mutable: true
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# CHECK-NEXT: InitExpr:
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# CHECK-NEXT: Opcode: I32_CONST
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# CHECK-NEXT: Value: 66560
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# Global 'undefined_weak:foo' representing the GOT entry for foo
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# Unlike other internal GOT entries that need to be mutable this one
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# is immutable and not updated by `__wasm_apply_global_relocs`
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# CHECK-NEXT: - Index: 1
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# CHECK-NEXT: Type: I32
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# CHECK-NEXT: Mutable: false
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# CHECK-NEXT: InitExpr:
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# CHECK-NEXT: Opcode: I32_CONST
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# CHECK-NEXT: Value: 0
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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: 'undefined_weak:foo'
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# CHECK-NEXT: - Index: 1
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# CHECK-NEXT: Name: get_foo_addr
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# CHECK-NEXT: - Index: 2
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# CHECK-NEXT: Name: _start
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# CHECK-NEXT: GlobalNames:
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# CHECK-NEXT: - Index: 0
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# CHECK-NEXT: Name: __stack_pointer
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# CHECK-NEXT: - Index: 1
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# CHECK-NEXT: Name: 'GOT.func.internal.undefined_weak:foo'
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# With `-pie` or `-shared` the resolution should be deferred to the dynamic
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# linker and the function address should be imported as GOT.func.foo.
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#
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# RUN: wasm-ld --experimental-pic -pie %t.o -o %t3.wasm
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# RUN: obj2yaml %t3.wasm | FileCheck %s --check-prefix=IMPORT
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# IMPORT: - Type: IMPORT
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# IMPORT: Field: foo
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# IMPORT-NEXT: Kind: FUNCTION
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# IMPORT-NEXT: SigIndex: 0
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# IMPORT-NEXT: - Module: GOT.func
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# IMPORT-NEXT: Field: foo
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# IMPORT-NEXT: Kind: GLOBAL
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# IMPORT-NEXT: GlobalType: I32
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# IMPORT-NEXT: GlobalMutable: true
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# IMPORT: GlobalNames:
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# IMPORT-NEXT: - Index: 0
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# IMPORT-NEXT: Name: __memory_base
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# IMPORT-NEXT: - Index: 1
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# IMPORT-NEXT: Name: __table_base
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# IMPORT-NEXT: - Index: 2
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# IMPORT-NEXT: Name: foo
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