forked from OSchip/llvm-project
[DebugInfo][InstrRef] Describe value sizes when spilt to stack
InstrRefBasedLDV can track and describe variable values that are spilt to the stack -- however it does not current describe the size of the value on the stack. This can cause uninitialized bytes to be read from the stack if a small register is spilt for a larger variable, or theoretically on big-endian machines if a large value on the stack is used for a small variable. Fix this by using DW_OP_deref_size to specify the amount of data to load from the stack, if there's any possibility for ambiguity. There are a few scenarios where this can be omitted (such as when using DW_OP_piece and a non-DW_OP_stack_value location), see deref-spills-with-size.mir for an explicit table of inputs flavours and output expressions. Differential Revision: https://reviews.llvm.org/D123599
This commit is contained in:
Jeremy Morse
parent
4a8c13a6f4
commit
a15b66e76d
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@ -870,19 +870,70 @@ MachineInstrBuilder MLocTracker::emitLoc(Optional<LocIdx> MLoc,
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// the variable is.
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if (Offset == 0) {
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const SpillLoc &Spill = SpillLocs[SpillID.id()];
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Expr = TRI.prependOffsetExpression(Expr, DIExpression::ApplyOffset,
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Spill.SpillOffset);
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unsigned Base = Spill.SpillBase;
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MIB.addReg(Base);
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MIB.addImm(0);
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// Being on the stack makes this location indirect; if it was _already_
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// indirect though, we need to add extra indirection. See this test for
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// a scenario where this happens:
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// llvm/test/DebugInfo/X86/spill-nontrivial-param.ll
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// There are several ways we can dereference things, and several inputs
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// to consider:
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// * NRVO variables will appear with IsIndirect set, but should have
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// nothing else in their DIExpressions,
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// * Variables with DW_OP_stack_value in their expr already need an
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// explicit dereference of the stack location,
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// * Values that don't match the variable size need DW_OP_deref_size,
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// * Everything else can just become a simple location expression.
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// We need to use deref_size whenever there's a mismatch between the
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// size of value and the size of variable portion being read.
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// Additionally, we should use it whenever dealing with stack_value
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// fragments, to avoid the consumer having to determine the deref size
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// from DW_OP_piece.
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bool UseDerefSize = false;
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unsigned ValueSizeInBits = getLocSizeInBits(*MLoc);
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unsigned DerefSizeInBytes = ValueSizeInBits / 8;
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if (auto Fragment = Var.getFragment()) {
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unsigned VariableSizeInBits = Fragment->SizeInBits;
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if (VariableSizeInBits != ValueSizeInBits || Expr->isComplex())
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UseDerefSize = true;
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} else if (auto Size = Var.getVariable()->getSizeInBits()) {
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if (*Size != ValueSizeInBits) {
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UseDerefSize = true;
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}
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}
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if (Properties.Indirect) {
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std::vector<uint64_t> Elts = {dwarf::DW_OP_deref};
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Expr = DIExpression::append(Expr, Elts);
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// This is something like an NRVO variable, where the pointer has been
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// spilt to the stack. It should end up being a memory location, with
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// the pointer to the variable loaded off the stack with a deref:
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assert(!Expr->isComplex());
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Expr = TRI.prependOffsetExpression(
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Expr, DIExpression::ApplyOffset | DIExpression::DerefAfter,
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Spill.SpillOffset);
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MIB.addImm(0);
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} else if (UseDerefSize) {
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// We're loading a value off the stack that's not the same size as the
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// variable. Add / subtract stack offset, explicitly deref with a size,
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// and add DW_OP_stack_value if not already present.
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SmallVector<uint64_t, 2> Ops = {dwarf::DW_OP_deref_size,
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DerefSizeInBytes};
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Expr = DIExpression::prependOpcodes(Expr, Ops, true);
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unsigned Flags = DIExpression::StackValue | DIExpression::ApplyOffset;
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Expr = TRI.prependOffsetExpression(Expr, Flags, Spill.SpillOffset);
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MIB.addReg(0);
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} else if (Expr->isComplex()) {
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// A variable with no size ambiguity, but with extra elements in it's
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// expression. Manually dereference the stack location.
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assert(Expr->isComplex());
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Expr = TRI.prependOffsetExpression(
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Expr, DIExpression::ApplyOffset | DIExpression::DerefAfter,
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Spill.SpillOffset);
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MIB.addReg(0);
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} else {
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// A plain value that has been spilt to the stack, with no further
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// context. Request a location expression, marking the DBG_VALUE as
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// IsIndirect.
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Expr = TRI.prependOffsetExpression(Expr, DIExpression::ApplyOffset,
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Spill.SpillOffset);
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MIB.addImm(0);
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}
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} else {
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// This is a stack location with a weird subregister offset: emit an undef
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@ -633,6 +633,19 @@ public:
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/// Return true if Idx is a spill machine location.
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bool isSpill(LocIdx Idx) const { return LocIdxToLocID[Idx] >= NumRegs; }
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/// How large is this location (aka, how wide is a value defined there?).
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unsigned getLocSizeInBits(LocIdx L) const {
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unsigned ID = LocIdxToLocID[L];
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if (!isSpill(L)) {
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return TRI.getRegSizeInBits(Register(ID), MF.getRegInfo());
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} else {
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// The slot location on the stack is uninteresting, we care about the
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// position of the value within the slot (which comes with a size).
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StackSlotPos Pos = locIDToSpillIdx(ID);
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return Pos.first;
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}
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}
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MLocIterator begin() { return MLocIterator(LocIdxToIDNum, 0); }
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MLocIterator end() {
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@ -0,0 +1,371 @@
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# RUN: llc %s -o - -experimental-debug-variable-locations=true \
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# RUN: -run-pass=livedebugvalues \
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# RUN: | FileCheck %s --implicit-check-not=DBG_VALUE
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# RUN: llc %s -o - -experimental-debug-variable-locations=true \
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# RUN: -start-before=livedebugvalues -filetype=obj \
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# RUN: | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF
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#
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# LLVM can produce DIExpressions that convert from one value of arbitrary size
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# to another. This is normally fine, however that means the value for a
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# variable tracked in instruction referencing might not be the same size as the
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# variable itself.
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#
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# This becomes a problem when values move onto the stack and we emit
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# DW_OP_deref: there is no information about how large a value the consumer
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# should load from the stack. The convention today appears to be the size of
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# the variable, and as a result if you have a value that's smaller than the
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# variable size, extra information is loaded onto the DWARF expression stack.
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# This then appears as a false variable value to the consumer.
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#
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# In this test, there are various scenarios to test where the size of the value
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# needs to reach the expression emitter in LiveDebugValues. However, there are
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# even more scenarios to consider where the value is in a spill slot, and:
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# * The value is larger than the variable, the same, or smaller,
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# * The variable is a normal scalar, or a fragment,
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# * There is a DW_OP_stack_value in the expression, or not
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# That gives us twelve situations to consider, and the easiest way to confirm
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# correctness is to write them all out. The final DWARF expressions to
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# produce are:
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# * No stack value,
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# * Scalar (32 bits),
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# * Larger value (64 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_stack_value
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# * Same value (32 bits)
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# DW_OP_breg7 RSP-8
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# * Smaller value (8 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_stack_value
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# * Fragment (32 bits)
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# * Larger value (64 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_stack_value, DW_OP_piece 0x4
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# * Same value (32 bits)
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# DW_OP_breg7 RSP-8, DW_OP_piece 0x4
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# * Smaller value (8 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_stack_value, DW_OP_piece 0x4
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# * Stack value (imagine there was some arithmetic on the stack before the
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# DW_OP_stack_value opcode),
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# * Scalar (32 bits),
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# * Larger value (64 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_stack_value
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# * Same value (32 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref, DW_OP_stack_value
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# * Smaller value (8 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_stack_value
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# * Fragment (32 bits)
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# * Larger value (64 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_stack_value, DW_OP_piece 0x4
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# * Same value (32 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x4, DW_OP_stack_value, DW_OP_piece 0x4
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# * Smaller value (8 bits)
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# DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_stack_value, DW_OP_piece 0x4
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#
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# The outlier from the pattern is (Stack value, Fragment, Same value size): we
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# put a DW_OP_deref_size in where a DW_OP_deref could have sufficied. However,
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# if we used DW_OP_deref, it would force the consumer to derive the deref size
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# from the DW_OP_piece, which is un-necessarily hard.
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## Capture variable num,
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# CHECK-DAG: ![[VARNUM:[0-9]+]] = !DILocalVariable(name: "flannel",
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# CHECK-DAG: ![[VARNUM2:[0-9]+]] = !DILocalVariable(name: "shoes",
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# DWARF: DW_TAG_variable
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# DWARF-NEXT: DW_AT_location
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## Defined in register, spilt to stack.
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# DWARF-NEXT: DW_OP_breg0 RAX+0, DW_OP_constu 0xff, DW_OP_and, DW_OP_convert (0x00000026) "DW_ATE_signed_8", DW_OP_convert (0x0000002a) "DW_ATE_signed_32", DW_OP_stack_value
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_convert (0x00000026) "DW_ATE_signed_8", DW_OP_convert (0x0000002a) "DW_ATE_signed_32", DW_OP_stack_value
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## Defined on stack.
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_convert (0x00000026) "DW_ATE_signed_8", DW_OP_convert (0x0000002a) "DW_ATE_signed_32", DW_OP_stack_value
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## DBG_PHI that moves to stack.
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_stack_value
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## DBG_PHI of stack with size.
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x2, DW_OP_stack_value
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## Followed by scalar / no-stack-value locations with various sizes.
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_stack_value
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# DWARF-NEXT: DW_OP_breg7 RSP-8
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_stack_value
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## scalar / stack value with various sizes.
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_lit1, DW_OP_plus, DW_OP_stack_value
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref, DW_OP_lit1, DW_OP_plus, DW_OP_stack_value
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_lit1, DW_OP_plus, DW_OP_stack_value)
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# DWARF: DW_AT_name ("flannel")
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# Variable with fragments.
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# DWARF: DW_TAG_variable
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# DWARF-NEXT: DW_AT_location
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## Scalar / no-stack-value locations with various sizes.
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_stack_value, DW_OP_piece 0x4
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_piece 0x4
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_stack_value, DW_OP_piece 0x4
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## Scalar / stack value with various sizes.
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x8, DW_OP_lit1, DW_OP_plus, DW_OP_stack_value, DW_OP_piece 0x4
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x4, DW_OP_lit1, DW_OP_plus, DW_OP_stack_value, DW_OP_piece 0x4
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# DWARF-NEXT: DW_OP_breg7 RSP-8, DW_OP_deref_size 0x1, DW_OP_lit1, DW_OP_plus, DW_OP_stack_value, DW_OP_piece 0x4)
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# DWARF: DW_AT_name ("shoes")
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--- |
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; ModuleID = 'missingvar.ll'
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source_filename = "a"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define linkonce_odr void @_ZNSt5dequeIPN4llvm4LoopESaIS2_EE13_M_insert_auxESt15_Deque_iteratorIS2_RS2_PS2_EmRKS2_() local_unnamed_addr align 2 !dbg !3 {
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entry:
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call void @llvm.dbg.value(metadata i32 0, metadata !8, metadata !DIExpression()), !dbg !7
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call void @llvm.dbg.value(metadata i32 0, metadata !10, metadata !DIExpression()), !dbg !7
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ret void
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.module.flags = !{!0, !9}
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!llvm.dbg.cu = !{!1}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "beards", isOptimized: true, runtimeVersion: 4, emissionKind: FullDebug)
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!2 = !DIFile(filename: "bees.cpp", directory: "")
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!3 = distinct !DISubprogram(name: "nope", scope: !2, file: !2, line: 1, type: !4, spFlags: DISPFlagDefinition, unit: !1)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6}
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!7 = !DILocation(line: 1, scope: !3)
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!8 = !DILocalVariable(name: "flannel", scope: !3, type: !6)
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!9 = !{i32 2, !"Dwarf Version", i32 5}
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!10 = !DILocalVariable(name: "shoes", scope: !3, type: !11)
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!11 = !DIBasicType(name: "long", size: 64, encoding: DW_ATE_signed)
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...
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---
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name: _ZNSt5dequeIPN4llvm4LoopESaIS2_EE13_M_insert_auxESt15_Deque_iteratorIS2_RS2_PS2_EmRKS2_
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alignment: 16
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi' }
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- { reg: '$rsi' }
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- { reg: '$rdx' }
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frameInfo:
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stackSize: 48
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offsetAdjustment: -48
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maxAlignment: 8
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 48
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fixedStack:
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- { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, callee-saved-register: '$rbx' }
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- { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, callee-saved-register: '$r12' }
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- { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, callee-saved-register: '$r13' }
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- { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, callee-saved-register: '$r14' }
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- { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$r15' }
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- { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$rbp' }
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stack:
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- { id: 0, type: spill-slot, offset: -64, size: 8, alignment: 8 }
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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liveins: $rdi, $rdx, $rsi, $rbp, $r15, $r14, $r13, $r12, $rbx
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; CHECK-LABEL: bb.0.entry:
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;; PART ONE: For this first block of tests, check that information about
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;; the size of the value on the stack makes it through to the expression.
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$al = MOV8ri 0, debug-instr-number 1, debug-location !7
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DBG_INSTR_REF 1, 0, !8, !DIExpression(DW_OP_LLVM_convert, 8, DW_ATE_signed, DW_OP_LLVM_convert, 32, DW_ATE_signed, DW_OP_stack_value), debug-location !7
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; CHECK: DBG_VALUE $al, $noreg, ![[VARNUM]],
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; CHECK-SAME: !DIExpression(DW_OP_LLVM_convert, 8, DW_ATE_signed,
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; CHECK-SAME : DW_OP_LLVM_convert, 32, DW_ATE_signed, DW_OP_stack_value)
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MOV8mr $rsp, 1, $noreg, -8, $noreg, renamable $al :: (store 1 into %stack.0)
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;; Clobber to force variable location onto stack. We should use a
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;; deref_size 1 because the value is smaller than the variable.
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$al = MOV8ri 0, debug-location !7
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; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
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; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus,
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; CHECK-SAME: DW_OP_deref_size, 1, DW_OP_LLVM_convert, 8, DW_ATE_signed,
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; CHECK-SAME: DW_OP_LLVM_convert, 32, DW_ATE_signed, DW_OP_stack_value),
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; Terminate the current variable location,
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DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
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; CHECK: DBG_VALUE $noreg, $noreg, ![[VARNUM]], !DIExpression()
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;; Try again, but with the value originating on the stack, to ensure that
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;; we can find its size. It should be deref_size 1 again.
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INC8m $rsp, 1, $noreg, 4, $noreg, implicit-def dead $eflags, debug-instr-number 2, debug-location !7 :: (store (s8) into %stack.0)
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DBG_INSTR_REF 2, 1000000, !8, !DIExpression(DW_OP_LLVM_convert, 8, DW_ATE_signed, DW_OP_LLVM_convert, 32, DW_ATE_signed, DW_OP_stack_value), debug-location !7
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; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
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; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus,
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; CHECK-SAME: DW_OP_deref_size, 1, DW_OP_LLVM_convert, 8, DW_ATE_signed,
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; CHECK-SAME: DW_OP_LLVM_convert, 32, DW_ATE_signed, DW_OP_stack_value),
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$eax = MOV32ri 0, debug-location !7
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;; How about DBG_PHIs? The size of the value is communicated by the register
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;; size, or an extra DBG_PHI operand, and that should feed through into the
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;; decision of whether to deref_size or not.
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DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
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; CHECK: DBG_VALUE $noreg
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$al = MOV8ri 0, debug-location !7
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DBG_PHI $al, 7
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MOV32mr $rsp, 1, $noreg, -8, $noreg, renamable $eax :: (store 4 into %stack.0)
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$eax = MOV32ri 0, debug-location !7
|
||||
DBG_INSTR_REF 7, 0, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 1, DW_OP_stack_value)
|
||||
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
|
||||
;; And for when the DBG_PHI specifies a stack size...
|
||||
DBG_PHI %stack.0, 8, 16
|
||||
DBG_INSTR_REF 8, 0, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 2, DW_OP_stack_value)
|
||||
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
DBG_VALUE $noreg, $noreg, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; PART TWO: test the twelve kinds of location expression mentioned in the
|
||||
;; opening comment of this test, in that order. Please update the opening
|
||||
;; comment, these lines and the DWARF check lines at the same time.
|
||||
;; In each test we'll state a location, give it an instruction to cover,
|
||||
;; and then terminate it.
|
||||
|
||||
;; Scalar (32), Large value (64), no stack value,
|
||||
$rax = MOV64ri 0, debug-instr-number 10, debug-location !7
|
||||
MOV64mr $rsp, 1, $noreg, -8, $noreg, renamable $rax :: (store 8 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 10, 0, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 8, DW_OP_stack_value),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Scalar (32), Same value size (32), no stack value,
|
||||
$eax = MOV32ri 0, debug-instr-number 11, debug-location !7
|
||||
MOV32mr $rsp, 1, $noreg, -8, $noreg, renamable $eax :: (store 4 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 11, 0, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, 0, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Scalar (32), Smaller value (8), no stack value,
|
||||
$al = MOV8ri 0, debug-instr-number 12, debug-location !7
|
||||
MOV8mr $rsp, 1, $noreg, -8, $noreg, renamable $al :: (store 1 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 12, 0, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 1, DW_OP_stack_value),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Fragment (32), Larger value (64), no stack value,
|
||||
$rax = MOV64ri 0, debug-instr-number 13, debug-location !7
|
||||
MOV64mr $rsp, 1, $noreg, -8, $noreg, renamable $rax :: (store 8 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 13, 0, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM2]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 8, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Fragment (32), Same value size (32), no stack value,
|
||||
$eax = MOV32ri 0, debug-instr-number 14, debug-location !7
|
||||
MOV32mr $rsp, 1, $noreg, -8, $noreg, renamable $eax :: (store 4 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 14, 0, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, 0, ![[VARNUM2]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_LLVM_fragment, 0, 32),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Fragment (32), Smaller value (8), no stack value,
|
||||
$al = MOV8ri 0, debug-instr-number 15, debug-location !7
|
||||
MOV8mr $rsp, 1, $noreg, -8, $noreg, renamable $al :: (store 1 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 15, 0, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM2]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 1, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
|
||||
|
||||
;; Scalar (32), Large value (64), with stack value,
|
||||
$rax = MOV64ri 0, debug-instr-number 16, debug-location !7
|
||||
MOV64mr $rsp, 1, $noreg, -8, $noreg, renamable $rax :: (store 8 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 16, 0, !8, !DIExpression(DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 8, DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Scalar (32), Same value size (32), no stack value,
|
||||
$eax = MOV32ri 0, debug-instr-number 17, debug-location !7
|
||||
MOV32mr $rsp, 1, $noreg, -8, $noreg, renamable $eax :: (store 4 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 17, 0, !8, !DIExpression(DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Scalar (32), Smaller value (8), no stack value,
|
||||
$al = MOV8ri 0, debug-instr-number 18, debug-location !7
|
||||
MOV8mr $rsp, 1, $noreg, -8, $noreg, renamable $al :: (store 1 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 18, 0, !8, !DIExpression(DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 1, DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !8, !DIExpression(), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Fragment (32), Larger value (64), no stack value,
|
||||
$rax = MOV64ri 0, debug-instr-number 19, debug-location !7
|
||||
MOV64mr $rsp, 1, $noreg, -8, $noreg, renamable $rax :: (store 8 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 19, 0, !10, !DIExpression(DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM2]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 8, DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Fragment (32), Same value size (32), no stack value,
|
||||
$eax = MOV32ri 0, debug-instr-number 20, debug-location !7
|
||||
MOV32mr $rsp, 1, $noreg, -8, $noreg, renamable $eax :: (store 4 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 20, 0, !10, !DIExpression(DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM2]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 4, DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
;; Fragment (32), Smaller value (8), no stack value,
|
||||
$al = MOV8ri 0, debug-instr-number 21, debug-location !7
|
||||
MOV8mr $rsp, 1, $noreg, -8, $noreg, renamable $al :: (store 1 into %stack.0)
|
||||
$rax = MOV64ri 0, debug-location !7
|
||||
DBG_INSTR_REF 21, 0, !10, !DIExpression(DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $rsp, $noreg, ![[VARNUM2]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref_size, 1, DW_OP_constu, 1, DW_OP_plus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32),
|
||||
$eax = MOV32ri 0, debug-location !7
|
||||
DBG_VALUE $noreg, $noreg, !10, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !7
|
||||
; CHECK: DBG_VALUE $noreg, $noreg
|
||||
|
||||
RET64 0, debug-location !7
|
||||
...
|
||||
|
|
@ -414,15 +414,12 @@ body: |
|
|||
# This third function tests that complex expressions are spilt, and restored
|
||||
# correctly within a basic block.
|
||||
|
||||
# FIXME: the spilt location below is wrong, there should be a deref between
|
||||
# the spill-offset and the DW_OP_plus_uconst.
|
||||
|
||||
# CHECK-LABEL: name: h
|
||||
# CHECK-LABEL: bb.0.entry:
|
||||
# CHECK: DBG_VALUE $rdi, $noreg, ![[RVAR]], !DIExpression(DW_OP_plus_uconst, 1)
|
||||
# CHECK-LABEL: bb.1.if.then:
|
||||
# CHECK: DBG_VALUE $rdi, $noreg, ![[RVAR]], !DIExpression(DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rsp, 0, ![[RVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rsp, $noreg, ![[RVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rdi, $noreg, ![[RVAR]], !DIExpression(DW_OP_plus_uconst, 1)
|
||||
# CHECK-LABEL: bb.2.if.end:
|
||||
# CHECK: DBG_VALUE $rdi, $noreg, ![[RVAR]], !DIExpression(DW_OP_plus_uconst, 1)
|
||||
|
|
@ -527,8 +524,6 @@ body: |
|
|||
# bb 2 and 3, neither of which modifies the stack loc. The exit block (3)
|
||||
# should still be tracking the spill, and restore it on stack load.
|
||||
|
||||
# FIXME: this test too contains a broken spill location.
|
||||
|
||||
# Summary: loc is in $rdi in bb0, spills to stack in bb1, remains in stack
|
||||
# in bb2, starts in stack then loaded in bb3.
|
||||
|
||||
|
|
@ -537,11 +532,11 @@ body: |
|
|||
# CHECK: DBG_VALUE $rdi, $noreg, ![[SVAR]], !DIExpression(DW_OP_plus_uconst, 1)
|
||||
# CHECK-LABEL: bb.1.foo:
|
||||
# CHECK: DBG_VALUE $rdi, $noreg, ![[SVAR]], !DIExpression(DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rsp, 0, ![[SVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rsp, $noreg, ![[SVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_plus_uconst, 1)
|
||||
# CHECK-LABEL: bb.2.if.then:
|
||||
# CHECK: DBG_VALUE $rsp, 0, ![[SVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rsp, $noreg, ![[SVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_plus_uconst, 1)
|
||||
# CHECK-LABEL: bb.3.if.end
|
||||
# CHECK: DBG_VALUE $rsp, 0, ![[SVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rsp, $noreg, ![[SVAR]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_plus_uconst, 1)
|
||||
# CHECK: DBG_VALUE $rdi, $noreg, ![[SVAR]], !DIExpression(DW_OP_plus_uconst, 1)
|
||||
name: i
|
||||
alignment: 16
|
||||
|
|
|
|||
|
|
@ -52,7 +52,7 @@
|
|||
!3 = !{!4}
|
||||
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
|
||||
!5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true)
|
||||
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!6 = !DIBasicType(name: "int", size: 64, encoding: DW_ATE_signed)
|
||||
!7 = !{i32 2, !"Dwarf Version", i32 4}
|
||||
!8 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!9 = !{i32 1, !"wchar_size", i32 2}
|
||||
|
|
|
|||
Loading…
Reference in New Issue