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[llvm-objdump] Add entry_value and stack_value opcodes

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Add the DW_OP_entry_value and DW_OP_stack_value opcodes to the DWARF
expression printer.

Differential revision: https://reviews.llvm.org/D74843
This commit is contained in:
Oliver Stannard 2020-02-19 12:34:12 +00:00
parent 0bff20bf2b
commit 7e201bfc21
3 changed files with 40 additions and 0 deletions
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4
include/llvm/DebugInfo/DWARF/DWARFExpression.h
View File

@ -126,6 +126,10 @@ public:
return Op;
}
iterator skipBytes(uint64_t Add) {
return iterator(Expr, Op.EndOffset + Add);
}
// Comparison operators are provided out of line.
friend bool operator==(const iterator &, const iterator &);
};

21
lib/DebugInfo/DWARF/DWARFExpression.cpp
View File

@ -424,6 +424,27 @@ static bool printCompactDWARFExpr(raw_ostream &OS, DWARFExpression::iterator I,
S << format("%+" PRId64, Offset);
break;
}
case dwarf::DW_OP_entry_value:
case dwarf::DW_OP_GNU_entry_value: {
// DW_OP_entry_value contains a sub-expression which must be rendered
// separately.
uint64_t SubExprLength = Op.getRawOperand(0);
DWARFExpression::iterator SubExprEnd = I.skipBytes(SubExprLength);
++I;
raw_svector_ostream S(Stack.emplace_back().String);
S << "entry(";
printCompactDWARFExpr(S, I, SubExprEnd, MRI);
S << ")";
I = SubExprEnd;
continue;
}
case dwarf::DW_OP_stack_value: {
// The top stack entry should be treated as the actual value of tne
// variable, rather than the address of the variable in memory.
assert(!Stack.empty());
Stack.back().Kind = PrintedExpr::Value;
break;
}
default:
if (Opcode >= dwarf::DW_OP_reg0 && Opcode <= dwarf::DW_OP_reg31) {
// DW_OP_reg<N>: A register, with the register num implied by the

15
unittests/DebugInfo/DWARF/DWARFExpressionCompactPrinterTest.cpp
View File

@ -98,3 +98,18 @@ TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg0_negative) {
TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_bregx) {
TestExprPrinter({DW_OP_bregx, 0x0d, 0x28}, "[SP+40]");
}
TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_stack_value) {
TestExprPrinter({DW_OP_breg13, 0x04, DW_OP_stack_value}, "SP+4");
}
TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_entry_value) {
TestExprPrinter({DW_OP_entry_value, 0x01, DW_OP_reg0, DW_OP_stack_value},
"entry(R0)");
}
TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_entry_value_mem) {
TestExprPrinter(
{DW_OP_entry_value, 0x02, DW_OP_breg13, 0x10, DW_OP_stack_value},
"entry([SP+16])");
}