4c75521ce0
For the object file writer we need to allow the underflow (ar write zero), but for the final linker output we should probably generate an error (I've left that as a TODO for now). Fixes: https://github.com/llvm/llvm-project/issues/54012 Differential Revision: https://reviews.llvm.org/D120522
91 lines
2.6 KiB
ArmAsm
91 lines
2.6 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.o %s
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# RUN: wasm-ld -r -o %t.wasm %t.o
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# RUN: obj2yaml %t.wasm | FileCheck %s
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# RUN: llvm-objdump --disassemble-symbols=_start --no-show-raw-insn --no-leading-addr %t.wasm | FileCheck %s --check-prefixes DIS
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.hidden foo
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.hidden bar
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.globl foo
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.globl bar
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# Similar to what would be generated from: `int foo[76]`
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.section .bss.foo,"",@
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.p2align 4
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foo:
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.skip 304
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.size foo, 304
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# bar contains a pointer to the 16th element of foo, which happens to be 64
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# bytes in. This generates an addend of 64 which is the value at which signed
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# and unsigned LEB encodes will differ.
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.section .data.bar,"",@
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.p2align 2
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bar:
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.int32 foo+64
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.size bar, 4
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# Check that negative addends also work here
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.section .data.negative_addend,"",@
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.p2align 2
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negative_addend:
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.int32 foo-16
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.size negative_addend, 4
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.globl _start
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.section .text,"",@
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_start:
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.functype _start () -> ()
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i32.const 0
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i32.load foo + 10
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drop
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i32.const 0
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i32.load foo - 10
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drop
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i32.const 0
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# This will underflow because i32.load (and the
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# corresponding relocation type) take an unsgiend (U32)
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# immediate.
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i32.load foo - 2048
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drop
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end_function
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# CHECK: - Type: CODE
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# CHECK-NEXT: Relocations:
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# CHECK-NEXT: - Type: R_WASM_MEMORY_ADDR_LEB
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# CHECK-NEXT: Index: 0
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# CHECK-NEXT: Offset: 0x7
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# CHECK-NEXT: Addend: 10
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# CHECK-NEXT: - Type: R_WASM_MEMORY_ADDR_LEB
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# CHECK-NEXT: Index: 0
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# CHECK-NEXT: Offset: 0x11
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# CHECK-NEXT: Addend: -10
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# CHECK-NEXT: - Type: R_WASM_MEMORY_ADDR_LEB
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# CHECK-NEXT: Index: 0
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# CHECK-NEXT: Offset: 0x1B
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# CHECK-NEXT: Addend: -2048
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# CHECK: - Type: DATA
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# CHECK-NEXT: Relocations:
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# CHECK-NEXT: - Type: R_WASM_MEMORY_ADDR_I32
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# CHECK-NEXT: Index: 0
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# CHECK-NEXT: Offset: 0x6
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# CHECK-NEXT: Addend: 64
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# CHECK-NEXT: - Type: R_WASM_MEMORY_ADDR_I32
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# CHECK-NEXT: Index: 0
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# CHECK-NEXT: Offset: 0xF
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# CHECK-NEXT: Addend: -16
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# DIS: <_start>:
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# DIS-EMPTY:
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# DIS-NEXT: i32.const 0
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# DIS-NEXT: i32.load 26
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# DIS-NEXT: drop
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# DIS-NEXT: i32.const 0
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# DIS-NEXT: i32.load 6
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# DIS-NEXT: drop
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# DIS-NEXT: i32.const 0
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# TODO(sbc): We should probably error here rather than allowing u32 to wrap
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# DIS-NEXT: i32.load 4294965264
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# DIS-NEXT: drop
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# DIS-NEXT: end
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