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Print complete DIExpressions in the assembler output DEBUG_VALUE comments.

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The previous code was complex, incorrect, and couldn't print everything.

llvm-svn: 301333
This commit is contained in:
Adrian Prantl 2017-04-25 17:22:09 +00:00
parent a6acecc0bd
commit 07a223b07a
7 changed files with 35 additions and 53 deletions
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50
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -825,43 +825,25 @@ static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
OS << Name << ":";
}
OS << V->getName();
const DIExpression *Expr = MI->getDebugExpression();
auto Fragment = Expr->getFragmentInfo();
if (Fragment)
OS << " [fragment offset=" << Fragment->OffsetInBits
<< " size=" << Fragment->SizeInBits << "]";
OS << " <- ";
// The second operand is only an offset if it's an immediate.
bool Deref = false;
bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
for (unsigned i = 0; i < Expr->getNumElements(); ++i) {
uint64_t Op = Expr->getElement(i);
if (Op == dwarf::DW_OP_LLVM_fragment) {
// There can't be any operands after this in a valid expression
break;
} else if (Deref) {
// We currently don't support extra Offsets or derefs after the first
// one. Bail out early instead of emitting an incorrect comment.
OS << " [complex expression]";
AP.OutStreamer->emitRawComment(OS.str());
return true;
} else if (Op == dwarf::DW_OP_deref) {
Deref = true;
continue;
}
uint64_t ExtraOffset = Expr->getElement(i++);
if (Op == dwarf::DW_OP_plus)
Offset += ExtraOffset;
else if (Op == dwarf::DW_OP_stack_value)
OS << " [stack value]";
else {
assert(Op == dwarf::DW_OP_minus);
Offset -= ExtraOffset;
const DIExpression *Expr = MI->getDebugExpression();
if (Expr->getNumElements()) {
OS << '[';
bool NeedSep = false;
for (auto Op : Expr->expr_ops()) {
if (NeedSep)
OS << ", ";
else
NeedSep = true;
OS << dwarf::OperationEncodingString(Op.getOp());
for (unsigned I = 0; I < Op.getNumArgs(); ++I)
OS << ' ' << Op.getArg(I);
}
OS << "] ";
}
// Register or immediate value. Register 0 means undef.
@ -892,7 +874,7 @@ static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
const TargetFrameLowering *TFI = AP.MF->getSubtarget().getFrameLowering();
Offset += TFI->getFrameIndexReference(*AP.MF,
MI->getOperand(0).getIndex(), Reg);
Deref = true;
MemLoc = true;
}
if (Reg == 0) {
// Suppress offset, it is not meaningful here.
@ -901,12 +883,12 @@ static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
AP.OutStreamer->emitRawComment(OS.str());
return true;
}
if (MemLoc || Deref)
if (MemLoc)
OS << '[';
OS << PrintReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
}
if (MemLoc || Deref)
if (MemLoc)
OS << '+' << Offset << ']';
// NOTE: Want this comment at start of line, don't emit with AddComment.

24
test/DebugInfo/COFF/pieces.ll
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@ -35,27 +35,27 @@
; }
; ASM-LABEL: loop_csr: # @loop_csr
; ASM: #DEBUG_VALUE: loop_csr:o [fragment offset=0 size=32] <- 0
; ASM: #DEBUG_VALUE: loop_csr:o [fragment offset=32 size=32] <- 0
; ASM: #DEBUG_VALUE: loop_csr:o <- [DW_OP_LLVM_fragment 0 32] 0
; ASM: #DEBUG_VALUE: loop_csr:o <- [DW_OP_LLVM_fragment 32 32] 0
; ASM: # BB#2: # %for.body.preheader
; ASM: xorl %edi, %edi
; ASM: xorl %esi, %esi
; ASM: .p2align 4, 0x90
; ASM: .LBB0_3: # %for.body
; ASM: [[ox_start:\.Ltmp[0-9]+]]:
; ASM: #DEBUG_VALUE: loop_csr:o [fragment offset=0 size=32] <- %EDI
; ASM: #DEBUG_VALUE: loop_csr:o <- [DW_OP_LLVM_fragment 0 32] %EDI
; ASM: .cv_loc 0 1 13 11 # t.c:13:11
; ASM: movl %edi, %ecx
; ASM: callq g
; ASM: movl %eax, %edi
; ASM: [[oy_start:\.Ltmp[0-9]+]]:
; ASM: #DEBUG_VALUE: loop_csr:o [fragment offset=0 size=32] <- %EDI
; ASM: #DEBUG_VALUE: loop_csr:o [fragment offset=32 size=32] <- %ESI
; ASM: #DEBUG_VALUE: loop_csr:o <- [DW_OP_LLVM_fragment 0 32] %EDI
; ASM: #DEBUG_VALUE: loop_csr:o <- [DW_OP_LLVM_fragment 32 32] %ESI
; ASM: .cv_loc 0 1 14 11 # t.c:14:11
; ASM: movl %esi, %ecx
; ASM: callq g
; ASM: movl %eax, %esi
; ASM: #DEBUG_VALUE: loop_csr:o [fragment offset=32 size=32] <- %ESI
; ASM: #DEBUG_VALUE: loop_csr:o <- [DW_OP_LLVM_fragment 32 32] %ESI
; ASM: cmpl n(%rip), %eax
; ASM: jl .LBB0_3
; ASM: [[oy_end:\.Ltmp[0-9]+]]:
@ -64,32 +64,32 @@
; ASM-LABEL: pad_right: # @pad_right
; ASM: #DEBUG_VALUE: pad_right:o [fragment offset=32 size=32] <- %ECX
; ASM: #DEBUG_VALUE: pad_right:o <- [DW_OP_LLVM_fragment 32 32] %ECX
; ASM: movl %ecx, %eax
; ASM: retq
; ASM-LABEL: pad_left: # @pad_left
; ASM: #DEBUG_VALUE: pad_left:o [fragment offset=0 size=32] <- %ECX
; ASM: #DEBUG_VALUE: pad_left:o <- [DW_OP_LLVM_fragment 0 32] %ECX
; ASM: .cv_loc 2 1 24 3 # t.c:24:3
; ASM: movl %ecx, %eax
; ASM: retq
; ASM-LABEL: nested: # @nested
; ASM: #DEBUG_VALUE: nested:o <- [%RCX+0]
; ASM: #DEBUG_VALUE: nested:o <- [DW_OP_deref] [%RCX+0]
; ASM: movl 12(%rcx), %eax
; ASM: [[p_start:\.Ltmp[0-9]+]]:
; ASM: #DEBUG_VALUE: nested:p [fragment offset=32 size=32] <- %EAX
; ASM: #DEBUG_VALUE: nested:p <- [DW_OP_LLVM_fragment 32 32] %EAX
; ASM: retq
; ASM-LABEL: bitpiece_spill: # @bitpiece_spill
; ASM: #DEBUG_VALUE: bitpiece_spill:o [fragment offset=0 size=32] <- 0
; ASM: #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_LLVM_fragment 0 32] 0
; ASM: xorl %ecx, %ecx
; ASM: callq g
; ASM: movl %eax, [[offset_o_x:[0-9]+]](%rsp) # 4-byte Spill
; ASM: [[spill_o_x_start:\.Ltmp[0-9]+]]:
; ASM: #DEBUG_VALUE: bitpiece_spill:o [fragment offset=32 size=32] <- [%RSP+[[offset_o_x]]]
; ASM: #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_LLVM_fragment 32 32] [%RSP+[[offset_o_x]]]
; ASM: #APP
; ASM: #NO_APP
; ASM: movl [[offset_o_x]](%rsp), %eax # 4-byte Reload

4
test/DebugInfo/X86/debug-loc-asan.ll
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@ -12,10 +12,10 @@
; The address of the (potentially now malloc'ed) alloca ends up
; in RDI, after which it is spilled to the stack. We record the
; spill OFFSET on the stack for checking the debug info below.
; CHECK: #DEBUG_VALUE: bar:y <- [%RDI+0]
; CHECK: #DEBUG_VALUE: bar:y <- [DW_OP_deref] [%RDI+0]
; CHECK: movq %rdi, [[OFFSET:[0-9]+]](%rsp)
; CHECK-NEXT: [[START_LABEL:.Ltmp[0-9]+]]
; CHECK-NEXT: #DEBUG_VALUE: bar:y <- [complex expression]
; CHECK-NEXT: #DEBUG_VALUE: bar:y <- [DW_OP_deref, DW_OP_deref]
; This location should be valid until the end of the function.
; CHECK: movq %rbp, %rsp

2
test/DebugInfo/X86/op_deref.ll
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@ -20,7 +20,7 @@
; right now, so we check the asm output:
; RUN: llc -O0 -mtriple=x86_64-apple-darwin %s -o - -filetype=asm | FileCheck %s -check-prefix=ASM-CHECK
; vla should have a register-indirect address at one point.
; ASM-CHECK: DEBUG_VALUE: vla <- [%RCX+0]
; ASM-CHECK: DEBUG_VALUE: vla <- [DW_OP_deref] [%RCX+0]
; ASM-CHECK: DW_OP_breg2
; RUN: llvm-as %s -o - | llvm-dis - | FileCheck %s --check-prefix=PRETTY-PRINT

4
test/DebugInfo/X86/pieces-4.ll
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@ -15,8 +15,8 @@
; CHECK-LABEL: bitpiece_spill: # @bitpiece_spill
; CHECK: callq g
; CHECK: movl %eax, [[offs:[0-9]+]](%rsp) # 4-byte Spill
; CHECK: #DEBUG_VALUE: bitpiece_spill:o [fragment offset=32 size=32] <- 0
; CHECK: #DEBUG_VALUE: bitpiece_spill:o [fragment offset=0 size=32] <- [%RSP+[[offs]]]
; CHECK: #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_LLVM_fragment 32 32] 0
; CHECK: #DEBUG_VALUE: bitpiece_spill:o <- [DW_OP_LLVM_fragment 0 32] [%RSP+[[offs]]]
; CHECK: #APP
; CHECK: #NO_APP
; CHECK: movl [[offs]](%rsp), %eax # 4-byte Reload

2
test/DebugInfo/X86/this-stack_value.ll
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@ -17,7 +17,7 @@
; The inlined A::this pointer has the same location as B::this, but it may not be
; modified by the debugger.
;
; ASM: [stack value]
; ASM: [DW_OP_stack_value]
; CHECK: Location description: 70 00 9f
; rax+0, stack-value
source_filename = "ab.cpp"

2
test/DebugInfo/X86/vla.ll
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@ -1,6 +1,6 @@
; RUN: llc -O0 -mtriple=x86_64-apple-darwin -filetype=asm %s -o - | FileCheck %s
; Ensure that we generate an indirect location for the variable length array a.
; CHECK: ##DEBUG_VALUE: vla:a <- [%RCX+0]
; CHECK: ##DEBUG_VALUE: vla:a <- [DW_OP_deref] [%RCX+0]
; CHECK: DW_OP_breg2
; rdar://problem/13658587
;