861dbe1a02
If the reference-types feature is enabled, call_indirect will explicitly reference its corresponding function table via `TABLE_NUMBER` relocations against a table symbol. Also, as before, address-taken functions can also cause the function table to be created, only with reference-types they additionally cause a symbol table entry to be emitted. We abuse the used-in-reloc flag on symbols to indicate which tables should end up in the symbol table. We do this because unfortunately older wasm-ld will carp if it see a table symbol. Differential Revision: https://reviews.llvm.org/D90948
65 lines
1.7 KiB
LLVM
65 lines
1.7 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -O2 | FileCheck %s
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; RUN: llc < %s -asm-verbose=false -mattr=+reference-types -O2 | FileCheck --check-prefix=REF %s
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; RUN: llc < %s -asm-verbose=false -O2 --filetype=obj | obj2yaml | FileCheck --check-prefix=YAML %s
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; This tests pointer features that may codegen differently in wasm64.
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target datalayout = "e-m:e-p:64:64-i64:64-n32:64-S128"
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target triple = "wasm64-unknown-unknown"
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define void @bar(i32 %n) {
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entry:
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ret void
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}
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define void @foo(void (i32)* %fp) {
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entry:
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call void %fp(i32 1)
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ret void
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}
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define void @test() {
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entry:
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call void @foo(void (i32)* @bar)
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store void (i32)* @bar, void (i32)** @fptr
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ret void
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}
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@fptr = global void (i32)* @bar
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; For simplicity (and compatibility with UB C/C++ code) we keep all types
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; of pointers the same size, so function pointers (which are 32-bit indices
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; in Wasm) are represented as 64-bit until called.
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; CHECK: .functype foo (i64) -> ()
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; CHECK-NEXT: i32.const 1
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.wrap_i64
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; CHECK-NEXT: call_indirect (i32) -> (), 0
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; REF: call_indirect (i32) -> (), __indirect_function_table
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; CHECK: .functype test () -> ()
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; CHECK-NEXT: i64.const bar
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; CHECK-NEXT: call foo
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; Check we're emitting a 64-bit relocs for the call_indirect, the
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; `i64.const bar` reference in code, and the global.
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; YAML: Memory:
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; YAML-NEXT: Flags: [ IS_64 ]
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; YAML-NEXT: Initial: 0x1
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; YAML: - Type: CODE
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; YAML: - Type: R_WASM_TABLE_INDEX_SLEB64
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; YAML-NEXT: Index: 0
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; YAML-NEXT: Offset: 0x16
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; YAML: - Type: R_WASM_TABLE_INDEX_SLEB64
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; YAML-NEXT: Index: 0
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; YAML-NEXT: Offset: 0x29
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; YAML: - Type: DATA
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; YAML: - Type: R_WASM_TABLE_INDEX_I64
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; YAML-NEXT: Index: 0
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; YAML-NEXT: Offset: 0x6
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