97982a8c60
This patch adds CFI instructions in the function epilogue. Before patch: addi sp, s0, -32 ld ra, 24(sp) # 8-byte Folded Reload ld s0, 16(sp) # 8-byte Folded Reload ld s1, 8(sp) # 8-byte Folded Reload addi sp, sp, 32 ret After patch: addi sp, s0, -32 .cfi_def_cfa sp, 32 ld ra, 24(sp) # 8-byte Folded Reload ld s0, 16(sp) # 8-byte Folded Reload ld s1, 8(sp) # 8-byte Folded Reload .cfi_restore ra .cfi_restore s0 .cfi_restore s1 addi sp, sp, 32 .cfi_def_cfa_offset 0 ret This functionality is already present in `riscv-gcc`, but it’s not in `clang` and this slightly impairs the `lldb` debugging experience, e.g. backtrace.
77 lines
2.4 KiB
LLVM
77 lines
2.4 KiB
LLVM
; RUN: llc -filetype=obj -mtriple=riscv32 -mattr=+relax %s -o %t.o
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; RUN: llvm-readobj -r %t.o | FileCheck -check-prefix=RELAX %s
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; RUN: llvm-dwarfdump --debug-frame %t.o 2>&1 \
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; RUN: | FileCheck -check-prefix=RELAX-DWARFDUMP %s
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;
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; RELAX: Section ({{.*}}) .rela.eh_frame {
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; REALX-NEXT: 0x1C R_RISCV_32_PCREL .L0 0x0
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; REALX-NEXT: 0x30 R_RISCV_32_PCREL .L0 0x0
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; REALX-NEXT: 0x48 R_RISCV_32_PCREL .L0 0x0
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; REALX-NEXT: 0x4C R_RISCV_ADD32 .L0 0x0
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; REALX-NEXT: 0x4C R_RISCV_SUB32 .L0 0x0
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; REALX-NEXT: 0x57 R_RISCV_SET6 .L0 0x0
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; RELAX-NEXT-EMPTY:
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; RELAX-DWARFDUMP-NOT: error: failed to compute relocation
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; RELAX-DWARFDUMP: FDE
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; RELAX-DWARFDUMP-NEXT: Format:
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; RELAX-DWARFDUMP: DW_CFA_advance_loc: 4
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; RELAX-DWARFDUMP-NEXT: DW_CFA_def_cfa_offset: +16
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; RELAX-DWARFDUMP-NEXT: DW_CFA_advance_loc: 8
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; RELAX-DWARFDUMP-NEXT: DW_CFA_def_cfa_offset: +0
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; RELAX-DWARFDUMP-NEXT: DW_CFA_nop:
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; RELAX-DWARFDUMP-EMPTY:
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; RELAX-DWARFDUMP: FDE
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; RELAX-DWARFDUMP: Format:
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; RELAX-DWARFDUMP-NEXT: DW_CFA_advance_loc: 4
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; RELAX-DWARFDUMP-NEXT: DW_CFA_def_cfa_offset: +16
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; RELAX-DWARFDUMP-NEXT: DW_CFA_advance_loc: 4
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; RELAX-DWARFDUMP-NEXT: DW_CFA_offset: X1 -4
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; RELAX-DWARFDUMP-NEXT: DW_CFA_advance_loc: 28
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; RELAX-DWARFDUMP-NEXT: DW_CFA_restore: X1
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; RELAX-DWARFDUMP-NEXT: DW_CFA_advance_loc: 4
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; RELAX-DWARFDUMP-NEXT: DW_CFA_def_cfa_offset: +0
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; RELAX-DWARFDUMP-EMPTY:
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source_filename = "frame.c"
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; Function Attrs: noinline nounwind optnone
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define i32 @init() {
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entry:
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ret i32 0
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}
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; Function Attrs: noinline nounwind optnone
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define i32 @foo(i32 signext %value) {
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entry:
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%value.addr = alloca i32, align 4
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store i32 %value, ptr %value.addr, align 4
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%0 = load i32, ptr %value.addr, align 4
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ret i32 %0
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}
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; Function Attrs: noinline nounwind optnone
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define i32 @bar() {
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entry:
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%result = alloca i32, align 4
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%v = alloca i32, align 4
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%call = call i32 @init()
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store i32 %call, ptr %v, align 4
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%0 = load i32, ptr %v, align 4
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%call1 = call i32 @foo(i32 signext %0)
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store i32 %call1, ptr %result, align 4
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%1 = load i32, ptr %result, align 4
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ret i32 %1
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "line.c", directory: "./")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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