derek.holloway
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113 lines
3.5 KiB
ArmAsm
113 lines
3.5 KiB
ArmAsm
## Test that BOLT handles large code model LSDA encoding correctly:
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## 1. Auto-detection via .ltext sections
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## 2. Disabling auto-detection with --large-code-model=0
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## 3. Forcing large code model with --large-code-model flag
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# REQUIRES: system-linux
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## Build two variants: one with .ltext section, one without.
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-linux \
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# RUN: --defsym LTEXT=1 %s -o %t.ltext.o
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# RUN: ld.lld --no-pie %t.ltext.o -o %t.ltext.exe -q -e _start
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-linux \
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# RUN: --defsym LTEXT=0 %s -o %t.text.o
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# RUN: ld.lld --no-pie %t.text.o -o %t.text.exe -q -e _start
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## Test 1: Auto-detection via .ltext section.
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# RUN: llvm-bolt %t.ltext.exe -o %t.ltext.bolt --reorder-blocks=none 2>&1 \
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# RUN: | FileCheck %s --check-prefix=CHECK-BOLT
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# CHECK-BOLT: enabling large code model
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# RUN: llvm-dwarfdump --eh-frame %t.ltext.bolt \
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# RUN: | FileCheck %s --check-prefix=CHECK-EH
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## Test 2: Disable large code model with --large-code-model=0, overriding
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## auto-detection even though .ltext is present.
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# RUN: llvm-bolt %t.ltext.exe -o %t.ltext.bolt2 --reorder-blocks=none \
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# RUN: --large-code-model=0 2>&1 \
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# RUN: | FileCheck %s --check-prefix=CHECK-DISABLED
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# CHECK-DISABLED-NOT: enabling large code model
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# RUN: llvm-dwarfdump --eh-frame %t.ltext.bolt2 \
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# RUN: | FileCheck %s --check-prefix=CHECK-EH
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## Test 3: --large-code-model flag forces large code model on a binary
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## without .ltext sections. No auto-detection message is printed since the
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## flag is explicit, but the LSDA encoding should still be updated.
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# RUN: llvm-bolt %t.text.exe -o %t.text.bolt --reorder-blocks=none \
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# RUN: --large-code-model 2>&1 \
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# RUN: | FileCheck %s --check-prefix=CHECK-FORCED
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# CHECK-FORCED-NOT: enabling large code model
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# RUN: llvm-dwarfdump --eh-frame %t.text.bolt \
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# RUN: | FileCheck %s --check-prefix=CHECK-EH
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## Verify the BOLT-emitted CIE uses 8-byte LSDA encoding (DW_EH_PE_absptr
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## = 0x00) instead of the default 4-byte encoding (DW_EH_PE_sdata4 = 0x1B).
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## In the "zLR" augmentation data: [L-enc] [R-enc].
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# CHECK-EH: Augmentation: "zLR"
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# CHECK-EH: Augmentation data: 00 1B
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.text
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.globl foo
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.type foo, @function
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foo:
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.cfi_startproc
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ret
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.cfi_endproc
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.size foo, .-foo
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.globl _start
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.type _start, @function
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_start:
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.Lfunc_begin0:
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.cfi_startproc
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.cfi_lsda 27, .Lexception0
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call foo
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.Ltmp0:
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call foo
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.Ltmp1:
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ret
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## Landing pads.
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.LLP0:
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ret
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.LLP1:
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ret
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.cfi_endproc
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.Lfunc_end0:
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.size _start, .Lfunc_end0-_start
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## Exception table.
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.section .gcc_except_table,"a",@progbits
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.p2align 2
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.Lexception0:
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.byte 255 # @LPStart Encoding = omit
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.byte 255 # @TType Encoding = omit
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.byte 1 # Call site Encoding = uleb128
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.uleb128 .Lcst_end0-.Lcst_begin0
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.Lcst_begin0:
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.uleb128 .Lfunc_begin0-.Lfunc_begin0 # Call Site 1
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.uleb128 .Ltmp0-.Lfunc_begin0
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.uleb128 .LLP0-.Lfunc_begin0 # landing pad
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.byte 0 # action: cleanup
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.uleb128 .Ltmp0-.Lfunc_begin0 # Call Site 2
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.uleb128 .Ltmp1-.Ltmp0
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.uleb128 .LLP1-.Lfunc_begin0 # landing pad
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.byte 0 # action: cleanup
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.Lcst_end0:
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## When LTEXT=1, emit large_func in .ltext to trigger auto-detection.
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.if LTEXT
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.section .ltext,"axl",@progbits
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.globl large_func
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.type large_func, @function
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large_func:
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.cfi_startproc
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movl $42, %eax
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retq
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.cfi_endproc
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.size large_func, .-large_func
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.endif
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