mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-29 23:12:55 +01:00
740d86dc79
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. llvm-svn: 210280
47 lines
1.5 KiB
LLVM
47 lines
1.5 KiB
LLVM
; RUN: llc <%s -jump-table-type=single | FileCheck %s
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
define i32 @f() unnamed_addr jumptable {
|
|
ret i32 0
|
|
}
|
|
|
|
define i32 @g(i8* %a) unnamed_addr jumptable {
|
|
ret i32 0
|
|
}
|
|
|
|
define void @h(void ()* %func) unnamed_addr jumptable {
|
|
ret void
|
|
}
|
|
|
|
define i32 @main() {
|
|
%g = alloca i32 (...)*, align 8
|
|
store i32 (...)* bitcast (i32 ()* @f to i32 (...)*), i32 (...)** %g, align 8
|
|
; CHECK: movq $__llvm_jump_instr_table_0_[[ENTRY:1|2|3]], (%rsp)
|
|
; CHECK: movl $__llvm_jump_instr_table_0_[[ENTRY]], %ecx
|
|
%1 = load i32 (...)** %g, align 8
|
|
%call = call i32 (...)* %1()
|
|
call void (void ()*)* @h(void ()* bitcast (void (void ()*)* @h to void ()*))
|
|
; CHECK: movl $__llvm_jump_instr_table_0_{{1|2|3}}, %edi
|
|
; CHECK: callq h
|
|
|
|
%a = call i32 (i32*)* bitcast (i32 (i8*)* @g to i32(i32*)*)(i32* null)
|
|
; CHECK: callq g
|
|
ret i32 %a
|
|
}
|
|
|
|
; CHECK: .globl __llvm_jump_instr_table_0_1
|
|
; CHECK: .align 8, 0x90
|
|
; CHECK: .type __llvm_jump_instr_table_0_1,@function
|
|
; CHECK: __llvm_jump_instr_table_0_1:
|
|
; CHECK: jmp {{f|g|h}}@PLT
|
|
; CHECK: .globl __llvm_jump_instr_table_0_2
|
|
; CHECK: .align 8, 0x90
|
|
; CHECK: .type __llvm_jump_instr_table_0_2,@function
|
|
; CHECK: __llvm_jump_instr_table_0_2:
|
|
; CHECK: jmp {{f|g|h}}@PLT
|
|
; CHECK: .globl __llvm_jump_instr_table_0_3
|
|
; CHECK: .align 8, 0x90
|
|
; CHECK: .type __llvm_jump_instr_table_0_3,@function
|
|
; CHECK: __llvm_jump_instr_table_0_3:
|
|
; CHECK: jmp {{f|g|h}}@PLT
|
|
|