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5d0f7af3dc
It includes a pass that rewrites all indirect calls to jumptable functions to pass through these tables. This also adds backend support for generating the jump-instruction tables on ARM and X86. Note that since the jumptable attribute creates a second function pointer for a function, any function marked with jumptable must also be marked with unnamed_addr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210280 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
927 B
LLVM
34 lines
927 B
LLVM
; RUN: llc <%s -jump-table-type=single | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @f() unnamed_addr jumptable {
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entry:
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ret i32 0
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}
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@i = alias internal i32 ()* @f
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@j = alias i32 ()* @f
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define i32 @main(i32 %argc, i8** %argv) {
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%temp = alloca i32 ()*, align 8
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store i32 ()* @i, i32()** %temp, align 8
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; CHECK: movq $__llvm_jump_instr_table_0_1
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%1 = load i32 ()** %temp, align 8
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; CHECK: movl $__llvm_jump_instr_table_0_1
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%2 = call i32 ()* %1()
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%3 = call i32 ()* @i()
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; CHECK: callq i
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%4 = call i32 ()* @j()
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; CHECK: callq j
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ret i32 %3
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}
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; There should only be one table, even though there are two GlobalAliases,
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; because they both alias the same value.
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; CHECK: .globl __llvm_jump_instr_table_0_1
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; CHECK: .align 8, 0x90
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; CHECK: .type __llvm_jump_instr_table_0_1,@function
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; CHECK: __llvm_jump_instr_table_0_1:
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; CHECK: jmp f@PLT
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