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[DebugInfo] Add a DW_OP_LLVM_entry_value operation
Summary: Internally in LLVM's metadata we use DW_OP_entry_value operations with the same semantics as DWARF; that is, its operand specifies the number of bytes that the entry value covers. At the time of emitting entry values we don't know the emitted size of the DWARF expression that the entry value will cover. Currently the size is hardcoded to 1 in DIExpression, and other values causes the verifier to fail. As the size is 1, that effectively means that we can only have valid entry values for registers that can be encoded in one byte, which are the registers with DWARF numbers 0 to 31 (as they can be encoded as single-byte DW_OP_reg0..DW_OP_reg31 rather than a multi-byte DW_OP_regx). It is a bit confusing, but it seems like llvm-dwarfdump will print an operation "correctly", even if the byte size is less than that, which may make it seem that we emit correct DWARF for registers with DWARF numbers > 31. If you instead use readelf for such cases, it will interpret the number of specified bytes as a DWARF expression. This seems like a limitation in llvm-dwarfdump. As suggested in D66746, a way forward would be to add an internal variant of DW_OP_entry_value, DW_OP_LLVM_entry_value, whose operand instead specifies the number of operations that the entry value covers, and we then translate that into the byte size at the time of emission. In this patch that internal operation is added. This patch keeps the limitation that a entry value can only be applied to simple register locations, but it will fix the issue with the size operand being incorrect for DWARF numbers > 31. Reviewers: aprantl, vsk, djtodoro, NikolaPrica Reviewed By: aprantl Subscribers: jyknight, fedor.sergeev, hiraditya, llvm-commits Tags: #debug-info, #llvm Differential Revision: https://reviews.llvm.org/D67492 llvm-svn: 374881
This commit is contained in:
David Stenberg
parent
89f87ca322
commit
49e133c5a7
@ -4793,17 +4793,24 @@ The current supported opcode vocabulary is limited:
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of the stack is treated as an address. The second stack entry is treated as an
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address space identifier.
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- ``DW_OP_stack_value`` marks a constant value.
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- If an expression is marked with ``DW_OP_entry_value`` all register and
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memory read operations refer to the respective value at the function entry.
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The first operand of ``DW_OP_entry_value`` is the size of following
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DWARF expression.
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``DW_OP_entry_value`` may appear after the ``LiveDebugValues`` pass.
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LLVM only supports entry values for function parameters
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that are unmodified throughout a function and that are described as
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simple register location descriptions.
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``DW_OP_entry_value`` may also appear after the ``AsmPrinter`` pass when
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a call site parameter value (``DW_AT_call_site_parameter_value``)
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is represented as entry value of the parameter.
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- ``DW_OP_LLVM_entry_value, N`` can only appear at the beginning of a
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``DIExpression``, and it specifies that all register and memory read
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operations for the debug value instruction's value/address operand and for
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the ``(N - 1)`` operations immediately following the
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``DW_OP_LLVM_entry_value`` refer to their respective values at function
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entry. For example, ``!DIExpression(DW_OP_LLVM_entry_value, 1,
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DW_OP_plus_uconst, 123, DW_OP_stack_value)`` specifies an expression where
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the entry value of the debug value instruction's value/address operand is
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pushed to the stack, and is added with 123. Due to framework limitations
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``N`` can currently only be 1.
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``DW_OP_LLVM_entry_value`` is only legal in MIR. The operation is introduced
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by the ``LiveDebugValues`` pass; currently only for function parameters that
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are unmodified throughout a function and that are described as simple
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register location descriptions. The operation is also introduced by the
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``AsmPrinter`` pass when a call site parameter value
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(``DW_AT_call_site_parameter_value``) is represented as entry value of the
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parameter.
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- ``DW_OP_breg`` (or ``DW_OP_bregx``) represents a content on the provided
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signed offset of the specified register. The opcode is only generated by the
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``AsmPrinter`` pass to describe call site parameter value which requires an
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@ -4852,7 +4859,7 @@ These flags encode various properties of DINodes.
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The `ArgumentNotModified` flag marks a function argument whose value
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is not modified throughout of a function. This flag is used to decide
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whether a DW_OP_entry_value can be used in a location description
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whether a DW_OP_LLVM_entry_value can be used in a location description
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after the function prologue. The language frontend is expected to compute
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this property for each DILocalVariable. The flag should be used
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only in optimized code.
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@ -117,9 +117,10 @@ enum LocationAtom {
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#include "llvm/BinaryFormat/Dwarf.def"
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DW_OP_lo_user = 0xe0,
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DW_OP_hi_user = 0xff,
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DW_OP_LLVM_fragment = 0x1000, ///< Only used in LLVM metadata.
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DW_OP_LLVM_convert = 0x1001, ///< Only used in LLVM metadata.
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DW_OP_LLVM_tag_offset = 0x1002, ///< Only used in LLVM metadata.
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DW_OP_LLVM_fragment = 0x1000, ///< Only used in LLVM metadata.
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DW_OP_LLVM_convert = 0x1001, ///< Only used in LLVM metadata.
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DW_OP_LLVM_tag_offset = 0x1002, ///< Only used in LLVM metadata.
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DW_OP_LLVM_entry_value = 0x1003, ///< Only used in LLVM metadata.
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};
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enum TypeKind : uint8_t {
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@ -1042,7 +1042,7 @@ public:
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}
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/// A DBG_VALUE is an entry value iff its debug expression contains the
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/// DW_OP_entry_value DWARF operation.
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/// DW_OP_LLVM_entry_value operation.
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bool isDebugEntryValue() const {
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return isDebugValue() && getDebugExpression()->isEntryValue();
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}
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@ -2569,7 +2569,7 @@ public:
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/// (This is the only configuration of entry values that is supported.)
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bool isEntryValue() const {
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return getNumElements() > 0 &&
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getElement(0) == dwarf::DW_OP_entry_value;
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getElement(0) == dwarf::DW_OP_LLVM_entry_value;
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}
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};
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@ -149,6 +149,8 @@ StringRef llvm::dwarf::OperationEncodingString(unsigned Encoding) {
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return "DW_OP_LLVM_fragment";
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case DW_OP_LLVM_tag_offset:
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return "DW_OP_LLVM_tag_offset";
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case DW_OP_LLVM_entry_value:
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return "DW_OP_LLVM_entry_value";
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}
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}
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@ -160,6 +162,7 @@ unsigned llvm::dwarf::getOperationEncoding(StringRef OperationEncodingString) {
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.Case("DW_OP_LLVM_convert", DW_OP_LLVM_convert)
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.Case("DW_OP_LLVM_fragment", DW_OP_LLVM_fragment)
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.Case("DW_OP_LLVM_tag_offset", DW_OP_LLVM_tag_offset)
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.Case("DW_OP_LLVM_entry_value", DW_OP_LLVM_entry_value)
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.Default(0);
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}
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@ -41,7 +41,7 @@ using EntryIndex = DbgValueHistoryMap::EntryIndex;
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static Register isDescribedByReg(const MachineInstr &MI) {
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assert(MI.isDebugValue());
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assert(MI.getNumOperands() == 4);
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// If the location of variable is an entry value (DW_OP_entry_value)
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// If the location of variable is an entry value (DW_OP_LLVM_entry_value)
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// do not consider it as a register location.
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if (MI.getDebugExpression()->isEntryValue())
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return 0;
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@ -1205,7 +1205,7 @@ void DwarfCompileUnit::addComplexAddress(const DbgVariable &DV, DIE &Die,
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if (DIExpr->isEntryValue()) {
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DwarfExpr.setEntryValueFlag();
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DwarfExpr.addEntryValueExpression(Cursor);
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DwarfExpr.beginEntryValueExpression(Cursor);
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}
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const TargetRegisterInfo &TRI = *Asm->MF->getSubtarget().getRegisterInfo();
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@ -669,10 +669,9 @@ static void collectCallSiteParameters(const MachineInstr *CallMI,
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// Emit the call site parameter's value as an entry value.
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if (ShouldTryEmitEntryVals) {
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// Create an entry value expression where the expression following
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// the 'DW_OP_entry_value' will be the size of 1 (a register operation).
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DIExpression *EntryExpr = DIExpression::get(MF->getFunction().getContext(),
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{dwarf::DW_OP_entry_value, 1});
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// Create an expression where the register's entry value is used.
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DIExpression *EntryExpr = DIExpression::get(
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MF->getFunction().getContext(), {dwarf::DW_OP_LLVM_entry_value, 1});
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for (auto RegEntry : ForwardedRegWorklist) {
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unsigned FwdReg = RegEntry;
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auto EntryValReg = RegsForEntryValues.find(RegEntry);
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@ -2200,7 +2199,7 @@ void DwarfDebug::emitDebugLocValue(const AsmPrinter &AP, const DIBasicType *BT,
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if (DIExpr->isEntryValue()) {
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DwarfExpr.setEntryValueFlag();
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DwarfExpr.addEntryValueExpression(Cursor);
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DwarfExpr.beginEntryValueExpression(Cursor);
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}
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const TargetRegisterInfo &TRI = *AP.MF->getSubtarget().getRegisterInfo();
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@ -254,6 +254,9 @@ bool DwarfExpression::addMachineRegExpression(const TargetRegisterInfo &TRI,
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addOpPiece(Reg.Size);
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}
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if (isEntryValue())
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finalizeEntryValue();
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if (isEntryValue() && !isParameterValue() && DwarfVersion >= 4)
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emitOp(dwarf::DW_OP_stack_value);
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@ -313,14 +316,33 @@ bool DwarfExpression::addMachineRegExpression(const TargetRegisterInfo &TRI,
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return true;
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}
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void DwarfExpression::addEntryValueExpression(DIExpressionCursor &ExprCursor) {
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void DwarfExpression::beginEntryValueExpression(
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DIExpressionCursor &ExprCursor) {
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auto Op = ExprCursor.take();
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assert(Op && Op->getOp() == dwarf::DW_OP_entry_value);
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assert(Op && Op->getOp() == dwarf::DW_OP_LLVM_entry_value);
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assert(!isMemoryLocation() &&
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"We don't support entry values of memory locations yet");
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assert(!IsEmittingEntryValue && "Already emitting entry value?");
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assert(Op->getArg(0) == 1 &&
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"Can currently only emit entry values covering a single operation");
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emitOp(CU.getDwarf5OrGNULocationAtom(dwarf::DW_OP_entry_value));
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emitUnsigned(Op->getArg(0));
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IsEmittingEntryValue = true;
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enableTemporaryBuffer();
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}
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void DwarfExpression::finalizeEntryValue() {
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assert(IsEmittingEntryValue && "Entry value not open?");
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disableTemporaryBuffer();
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// Emit the entry value's size operand.
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unsigned Size = getTemporaryBufferSize();
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emitUnsigned(Size);
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// Emit the entry value's DWARF block operand.
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commitTemporaryBuffer();
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IsEmittingEntryValue = false;
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}
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/// Assuming a well-formed expression, match "DW_OP_deref* DW_OP_LLVM_fragment?".
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@ -111,6 +111,9 @@ protected:
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const char *Comment;
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};
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/// Whether we are currently emitting an entry value operation.
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bool IsEmittingEntryValue = false;
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DwarfCompileUnit &CU;
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/// The register location, if any.
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@ -260,6 +263,10 @@ protected:
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/// expression. See PR21176 for more details.
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void addStackValue();
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/// Finalize an entry value by emitting its size operand, and committing the
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/// DWARF block which has been emitted to the temporary buffer.
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void finalizeEntryValue();
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~DwarfExpression() = default;
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public:
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@ -310,8 +317,11 @@ public:
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DIExpressionCursor &Expr, unsigned MachineReg,
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unsigned FragmentOffsetInBits = 0);
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/// Emit entry value dwarf operation.
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void addEntryValueExpression(DIExpressionCursor &ExprCursor);
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/// Begin emission of an entry value dwarf operation. The entry value's
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/// first operand is the size of the DWARF block (its second operand),
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/// which needs to be calculated at time of emission, so we don't emit
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/// any operands here.
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void beginEntryValueExpression(DIExpressionCursor &ExprCursor);
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/// Emit all remaining operations in the DIExpressionCursor.
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///
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@ -843,7 +843,7 @@ unsigned DIExpression::ExprOperand::getSize() const {
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case dwarf::DW_OP_deref_size:
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case dwarf::DW_OP_plus_uconst:
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case dwarf::DW_OP_LLVM_tag_offset:
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case dwarf::DW_OP_entry_value:
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case dwarf::DW_OP_LLVM_entry_value:
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case dwarf::DW_OP_regx:
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return 2;
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default:
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@ -890,10 +890,12 @@ bool DIExpression::isValid() const {
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return false;
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break;
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}
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case dwarf::DW_OP_entry_value: {
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// An entry value operator must appear at the begin and the size
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// of following expression should be 1, because we support only
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// entry values of a simple register location.
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case dwarf::DW_OP_LLVM_entry_value: {
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// An entry value operator must appear at the beginning and the number of
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// operations it cover can currently only be 1, because we support only
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// entry values of a simple register location. One reason for this is that
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// we currently can't calculate the size of the resulting DWARF block for
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// other expressions.
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return I->get() == expr_op_begin()->get() && I->getArg(0) == 1 &&
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getNumElements() == 2;
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}
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@ -1050,7 +1052,7 @@ DIExpression *DIExpression::prependOpcodes(const DIExpression *Expr,
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assert(Expr && "Can't prepend ops to this expression");
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if (EntryValue) {
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Ops.push_back(dwarf::DW_OP_entry_value);
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Ops.push_back(dwarf::DW_OP_LLVM_entry_value);
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// Add size info needed for entry value expression.
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// Add plus one for target register operand.
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Ops.push_back(Expr->getNumElements() + 1);
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@ -518,6 +518,7 @@ private:
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DIExpression::FragmentInfo Fragment,
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ValueOrMetadata *Desc);
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void verifyFnArgs(const DbgVariableIntrinsic &I);
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void verifyNotEntryValue(const DbgVariableIntrinsic &I);
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/// Module-level debug info verification...
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void verifyCompileUnits();
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@ -4213,8 +4214,10 @@ void Verifier::visitInstruction(Instruction &I) {
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visitMDNode(*N);
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}
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if (auto *DII = dyn_cast<DbgVariableIntrinsic>(&I))
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if (auto *DII = dyn_cast<DbgVariableIntrinsic>(&I)) {
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verifyFragmentExpression(*DII);
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verifyNotEntryValue(*DII);
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}
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InstsInThisBlock.insert(&I);
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}
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@ -5047,6 +5050,16 @@ void Verifier::verifyFnArgs(const DbgVariableIntrinsic &I) {
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Prev, Var);
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}
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void Verifier::verifyNotEntryValue(const DbgVariableIntrinsic &I) {
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DIExpression *E = dyn_cast_or_null<DIExpression>(I.getRawExpression());
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// We don't know whether this intrinsic verified correctly.
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if (!E || !E->isValid())
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return;
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AssertDI(!E->isEntryValue(), "Entry values are only allowed in MIR", &I);
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}
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void Verifier::verifyCompileUnits() {
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// When more than one Module is imported into the same context, such as during
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// an LTO build before linking the modules, ODR type uniquing may cause types
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91
test/DebugInfo/ARM/entry-value-multi-byte-expr.ll
Normal file
91
test/DebugInfo/ARM/entry-value-multi-byte-expr.ll
Normal file
@ -0,0 +1,91 @@
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; RUN: llc -debug-entry-values -filetype=asm -o - %s | FileCheck %s
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; Verify that the size operands of the DW_OP_GNU_entry_value operations are
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; correct for the multi-byte DW_OP_regx expressions.
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; Based on the following C reproducer:
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;
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; extern void clobber();
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; double global;
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; int f(double a, double b) {
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; global = a + b;
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; clobber();
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; return 1;
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; }
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; This test checks the assembly output rather than the output from
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; llvm-dwarfdump, as the latter printed the DW_OP_regx D0 correctly, even
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; though the entry value's size operand did not fully cover that:
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; DW_OP_GNU_entry_value(DW_OP_regx D0), DW_OP_stack_value
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;
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; whereas readelf interpreted it as an DW_OP_GNU_entry_value covering one byte,
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; resulting in garbage data:
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;
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; DW_OP_GNU_entry_value: (DW_OP_regx: 0 (r0)); DW_OP_breg16 (r16): 2; DW_OP_stack_value
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; CHECK: .byte 243 @ DW_OP_GNU_entry_value
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; CHECK-NEXT: .byte 3 @ 3
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; CHECK-NEXT: .byte 144 @ DW_OP_regx
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; CHECK-NEXT: .byte 128 @ 256
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; CHECK-NEXT: .byte 2 @
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; CHECK-NEXT: .byte 159 @ DW_OP_stack_value
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; CHECK: .byte 243 @ DW_OP_GNU_entry_value
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; CHECK-NEXT: .byte 3 @ 3
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; CHECK-NEXT: .byte 144 @ DW_OP_regx
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; CHECK-NEXT: .byte 129 @ 257
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; CHECK-NEXT: .byte 2 @
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; CHECK-NEXT: .byte 159 @ DW_OP_stack_value
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7-unknown-unknown"
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@global = common global double 0.000000e+00, align 8, !dbg !0
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; Function Attrs: nounwind
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define arm_aapcs_vfpcc i32 @f(double %a, double %b) #0 !dbg !12 {
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entry:
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call void @llvm.dbg.value(metadata double %a, metadata !17, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.value(metadata double %b, metadata !18, metadata !DIExpression()), !dbg !19
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%add = fadd double %a, %b, !dbg !20
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store double %add, double* @global, align 8, !dbg !20
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tail call arm_aapcs_vfpcc void @clobber(), !dbg !21
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ret i32 1, !dbg !22
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}
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declare arm_aapcs_vfpcc void @clobber()
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone speculatable willreturn }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9, !10}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "entry-value-multi-byte-expr.c", directory: "/")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = !{i32 1, !"min_enum_size", i32 4}
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!11 = !{!"clang version 10.0.0"}
|
||||
!12 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 6, type: !13, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)
|
||||
!13 = !DISubroutineType(types: !14)
|
||||
!14 = !{!15, !6, !6}
|
||||
!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!16 = !{!17, !18}
|
||||
!17 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 6, type: !6, flags: DIFlagArgumentNotModified)
|
||||
!18 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 6, type: !6, flags: DIFlagArgumentNotModified)
|
||||
!19 = !DILocation(line: 0, scope: !12)
|
||||
!20 = !DILocation(line: 7, scope: !12)
|
||||
!21 = !DILocation(line: 8, scope: !12)
|
||||
!22 = !DILocation(line: 9, scope: !12)
|
||||
@ -98,7 +98,7 @@ body: |
|
||||
# CHECK-NEXT: $r29 = S2_allocframe $r29, 0
|
||||
# CHECK-NEXT: J2_call @clobber
|
||||
# CHECK-NEXT: }
|
||||
# CHECK-NEXT: DBG_VALUE $r0, $noreg, !16, !DIExpression(DW_OP_entry_value, 1)
|
||||
# CHECK-NEXT: DBG_VALUE $r0, $noreg, !16, !DIExpression(DW_OP_LLVM_entry_value, 1)
|
||||
|
||||
---
|
||||
name: bar
|
||||
@ -136,4 +136,4 @@ body: |
|
||||
# CHECK-NEXT: $r29 = S2_allocframe $r29, 0
|
||||
# CHECK-NEXT: J2_call @clobber
|
||||
# CHECK-NEXT: }
|
||||
# CHECK-NEXT: DBG_VALUE $r0, $noreg, !22, !DIExpression(DW_OP_entry_value, 1)
|
||||
# CHECK-NEXT: DBG_VALUE $r0, $noreg, !22, !DIExpression(DW_OP_LLVM_entry_value, 1)
|
||||
|
||||
@ -61,7 +61,7 @@ body: |
|
||||
DBG_VALUE $edi, $noreg, !16, !DIExpression(), debug-location !18
|
||||
DBG_VALUE $edi, $noreg, !17, !DIExpression(), debug-location !18
|
||||
$edi = KILL renamable $edi, implicit killed $rdi, debug-location !18
|
||||
DBG_VALUE $rdi, $noreg, !16, !DIExpression(DW_OP_entry_value, 1), debug-location !18
|
||||
DBG_VALUE $rdi, $noreg, !16, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location !18
|
||||
TAILJMPd64 @fn2, csr_64, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp, implicit killed $edi, debug-location !18
|
||||
|
||||
...
|
||||
|
||||
@ -190,10 +190,10 @@ body: |
|
||||
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !21
|
||||
CFI_INSTRUCTION def_cfa_offset 24, debug-location !21
|
||||
$r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !21
|
||||
DBG_VALUE $ecx, $noreg, !17, !DIExpression(DW_OP_entry_value, 1), debug-location !21
|
||||
DBG_VALUE $ecx, $noreg, !17, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location !21
|
||||
CFI_INSTRUCTION def_cfa_offset 16, debug-location !21
|
||||
$r15 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !21
|
||||
DBG_VALUE $esi, $noreg, !15, !DIExpression(DW_OP_entry_value, 1), debug-location !21
|
||||
DBG_VALUE $esi, $noreg, !15, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location !21
|
||||
CFI_INSTRUCTION def_cfa_offset 8, debug-location !21
|
||||
RETQ $eax, debug-location !21
|
||||
|
||||
|
||||
@ -14,8 +14,8 @@
|
||||
# fn2 (a);
|
||||
# u --;
|
||||
#}
|
||||
# CHECK: DBG_VALUE $edi, $noreg, !14, !DIExpression(DW_OP_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $esi, $noreg, !15, !DIExpression(DW_OP_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $edi, $noreg, !14, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $esi, $noreg, !15, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location {{.*}}
|
||||
|
||||
--- |
|
||||
; ModuleID = 'test.c'
|
||||
|
||||
@ -7,11 +7,11 @@
|
||||
# return 123;
|
||||
#}
|
||||
#
|
||||
# Verify that DW_OP_entry_values are generated for parameters with multiple
|
||||
# Verify that DW_OP_LLVM_entry_values are generated for parameters with multiple
|
||||
# DBG_VALUEs at entry block.
|
||||
# CHECK: DBG_VALUE $edi, $noreg, !{{.*}}, !DIExpression(DW_OP_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $edx, $noreg, !{{.*}}, !DIExpression(DW_OP_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $esi, $noreg, !{{.*}}, !DIExpression(DW_OP_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $edi, $noreg, !{{.*}}, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $edx, $noreg, !{{.*}}, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location {{.*}}
|
||||
# CHECK: DBG_VALUE $esi, $noreg, !{{.*}}, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location {{.*}}
|
||||
|
||||
--- |
|
||||
; ModuleID = 'multiple-param-dbg-value-entry.ll'
|
||||
|
||||
79
test/DebugInfo/Sparc/entry-value-complex-reg-expr.ll
Normal file
79
test/DebugInfo/Sparc/entry-value-complex-reg-expr.ll
Normal file
@ -0,0 +1,79 @@
|
||||
; RUN: llc -debug-entry-values -filetype=asm -o - %s | FileCheck %s
|
||||
|
||||
; Verify that the entry value covers both of the DW_OP_regx pieces. Previously
|
||||
; the size operand of the entry value would be hardcoded to one.
|
||||
;
|
||||
; XXX: Is this really what should be emitted, or should we instead emit one
|
||||
; entry value operation per DW_OP_regx? GDB can currently not understand
|
||||
; entry values containing complex expressions like this.
|
||||
|
||||
target datalayout = "E-m:e-i64:64-n32:64-S128"
|
||||
target triple = "sparc64"
|
||||
|
||||
; Based on the following C reproducer:
|
||||
;
|
||||
; volatile long double global;
|
||||
; extern void clobber();
|
||||
; int foo(long double p) {
|
||||
; global = p;
|
||||
; clobber();
|
||||
; return 123;
|
||||
; }
|
||||
|
||||
; CHECK: .byte 243 ! DW_OP_GNU_entry_value
|
||||
; CHECK-NEXT: .byte 8 ! 8
|
||||
; CHECK-NEXT: .byte 144 ! sub-register DW_OP_regx
|
||||
; CHECK-NEXT: .byte 72 ! 72
|
||||
; CHECK-NEXT: .byte 147 ! DW_OP_piece
|
||||
; CHECK-NEXT: .byte 8 ! 8
|
||||
; CHECK-NEXT: .byte 144 ! sub-register DW_OP_regx
|
||||
; CHECK-NEXT: .byte 73 ! 73
|
||||
; CHECK-NEXT: .byte 147 ! DW_OP_piece
|
||||
; CHECK-NEXT: .byte 8 ! 8
|
||||
; CHECK-NEXT: .byte 159 ! DW_OP_stack_value
|
||||
|
||||
@global = common global fp128 0xL00000000000000000000000000000000, align 16, !dbg !0
|
||||
|
||||
; Function Attrs: nounwind
|
||||
define signext i32 @foo(fp128 %p) #0 !dbg !12 {
|
||||
entry:
|
||||
call void @llvm.dbg.value(metadata fp128 %p, metadata !17, metadata !DIExpression()), !dbg !18
|
||||
store volatile fp128 %p, fp128* @global, align 16, !dbg !19
|
||||
tail call void @clobber(), !dbg !20
|
||||
ret i32 123, !dbg !21
|
||||
}
|
||||
|
||||
declare void @clobber()
|
||||
|
||||
; Function Attrs: nounwind readnone speculatable willreturn
|
||||
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
|
||||
|
||||
attributes #0 = { nounwind }
|
||||
attributes #1 = { nounwind readnone speculatable willreturn }
|
||||
|
||||
!llvm.dbg.cu = !{!2}
|
||||
!llvm.module.flags = !{!8, !9, !10}
|
||||
!llvm.ident = !{!11}
|
||||
|
||||
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
|
||||
!1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
|
||||
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
|
||||
!3 = !DIFile(filename: "entry-value-complex-reg-expr.c", directory: "/")
|
||||
!4 = !{}
|
||||
!5 = !{!0}
|
||||
!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
|
||||
!7 = !DIBasicType(name: "long double", size: 128, encoding: DW_ATE_float)
|
||||
!8 = !{i32 2, !"Dwarf Version", i32 4}
|
||||
!9 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!10 = !{i32 1, !"wchar_size", i32 4}
|
||||
!11 = !{!"clang version 10.0.0"}
|
||||
!12 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 3, type: !13, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)
|
||||
!13 = !DISubroutineType(types: !14)
|
||||
!14 = !{!15, !7}
|
||||
!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!16 = !{!17}
|
||||
!17 = !DILocalVariable(name: "p", arg: 1, scope: !12, file: !3, line: 3, type: !7, flags: DIFlagArgumentNotModified)
|
||||
!18 = !DILocation(line: 0, scope: !12)
|
||||
!19 = !DILocation(line: 4, scope: !12)
|
||||
!20 = !DILocation(line: 5, scope: !12)
|
||||
!21 = !DILocation(line: 6, scope: !12)
|
||||
8
test/Verifier/diexpression-dwarf-entry-value.ll
Normal file
8
test/Verifier/diexpression-dwarf-entry-value.ll
Normal file
@ -0,0 +1,8 @@
|
||||
; RUN: not opt -S < %s 2>&1 | FileCheck %s
|
||||
|
||||
; We can only use the internal variant of the entry value operation,
|
||||
; DW_OP_LLVM_entry_value, in DIExpressions.
|
||||
|
||||
!named = !{!0}
|
||||
; CHECK: invalid expression
|
||||
!0 = !DIExpression(DW_OP_entry_value, 1)
|
||||
31
test/Verifier/diexpression-entry-value-llvm-ir.ll
Normal file
31
test/Verifier/diexpression-entry-value-llvm-ir.ll
Normal file
@ -0,0 +1,31 @@
|
||||
; RUN: llvm-as -disable-output <%s 2>&1| FileCheck %s
|
||||
|
||||
; The DW_OP_LLVM_entry_value operation can only be used in MIR.
|
||||
|
||||
; CHECK: Entry values are only allowed in MIR
|
||||
; CHECK: call void @llvm.dbg.value(metadata i32 %param, metadata !{{.*}}, metadata !DIExpression(DW_OP_LLVM_entry_value, 1))
|
||||
; CHECK: warning: ignoring invalid debug info
|
||||
|
||||
define void @foo(i32 %param) !dbg !4 {
|
||||
entry:
|
||||
call void @llvm.dbg.value(metadata i32 %param, metadata !8, metadata !DIExpression(DW_OP_LLVM_entry_value, 1)), !dbg !9
|
||||
ret void
|
||||
}
|
||||
|
||||
declare void @llvm.dbg.value(metadata, metadata, metadata) #0
|
||||
|
||||
attributes #0 = { nounwind readnone speculatable willreturn }
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!2, !3}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, emissionKind: FullDebug)
|
||||
!1 = !DIFile(filename: "a.c", directory: "/")
|
||||
!2 = !{i32 2, !"Dwarf Version", i32 4}
|
||||
!3 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, type: !5, unit: !0)
|
||||
!5 = !DISubroutineType(types: !6)
|
||||
!6 = !{null, !7}
|
||||
!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!8 = !DILocalVariable(name: "param", arg: 1, scope: !4, file: !1, type: !7)
|
||||
!9 = !DILocation(line: 0, scope: !4)
|
||||
@ -2,6 +2,11 @@
|
||||
|
||||
!named = !{!0, !1, !2}
|
||||
; CHECK: invalid expression
|
||||
!0 = !DIExpression(DW_OP_entry_value, 4, DW_OP_constu, 0, DW_OP_stack_value)
|
||||
!1 = !DIExpression(DW_OP_constu, 0, DW_OP_entry_value, 1, DW_OP_constu, 0)
|
||||
!2 = !DIExpression(DW_OP_entry_value, 100, DW_OP_constu, 0)
|
||||
; CHECK-NEXT: !DIExpression
|
||||
; CHECK: invalid expression
|
||||
; CHECK-NEXT: !DIExpression
|
||||
; CHECK: invalid expression
|
||||
; CHECK-NEXT: !DIExpression
|
||||
!0 = !DIExpression(DW_OP_LLVM_entry_value, 4, DW_OP_constu, 0, DW_OP_stack_value)
|
||||
!1 = !DIExpression(DW_OP_constu, 0, DW_OP_LLVM_entry_value, 1, DW_OP_constu, 0)
|
||||
!2 = !DIExpression(DW_OP_LLVM_entry_value, 100, DW_OP_constu, 0)
|
||||
|
||||
@ -2,4 +2,4 @@
|
||||
|
||||
!named = !{!0}
|
||||
; CHECK-NOT: invalid expression
|
||||
!0 = !DIExpression(DW_OP_entry_value, 1)
|
||||
!0 = !DIExpression(DW_OP_LLVM_entry_value, 1)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user