[lldb] [llvm] [lldb] Return an llvm::Expected from DWARFExpression::Evaluate (NFCI) (PR #94420)
Jonas Devlieghere via llvm-commits
llvm-commits at lists.llvm.org
Tue Jun 4 19:48:40 PDT 2024
https://github.com/JDevlieghere updated https://github.com/llvm/llvm-project/pull/94420
>From 22bb28a5e3fc84c75e1013c3b0c15654e7b786da Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas at devlieghere.com>
Date: Tue, 4 Jun 2024 17:04:15 -0700
Subject: [PATCH 1/4] [Support] Add variadic createStringError overload (NFC)
---
llvm/include/llvm/Support/Error.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/llvm/include/llvm/Support/Error.h b/llvm/include/llvm/Support/Error.h
index 662c3ea46e3c1..1fa0d8cb709cc 100644
--- a/llvm/include/llvm/Support/Error.h
+++ b/llvm/include/llvm/Support/Error.h
@@ -1277,6 +1277,11 @@ inline Error createStringError(const Twine &S) {
return createStringError(llvm::inconvertibleErrorCode(), S);
}
+template <typename... Ts>
+inline Error createStringError(char const *Fmt, const Ts &...Vals) {
+ return createStringError(llvm::inconvertibleErrorCode(), Fmt, Vals...);
+}
+
template <typename... Ts>
inline Error createStringError(std::errc EC, char const *Fmt,
const Ts &... Vals) {
>From d5c288ddb9473a52a8635a32d3a5cc057c9cb986 Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas at devlieghere.com>
Date: Tue, 4 Jun 2024 19:04:07 -0700
Subject: [PATCH 2/4] [lldb] Return an llvm::Expected from
DWARFExpression::Evaluate (NFCI)
Change the interface of DWARFExpression::Evaluate and
DWARFExpressionList::Evaluate to return an llvm::Expected instead of a
boolean. This eliminates the Status output parameter and improves error
handling.
---
.../include/lldb/Expression/DWARFExpression.h | 13 +-
.../lldb/Expression/DWARFExpressionList.h | 10 +-
lldb/source/Core/ValueObjectVariable.cpp | 8 +-
lldb/source/Expression/DWARFExpression.cpp | 747 +++++++-----------
.../source/Expression/DWARFExpressionList.cpp | 28 +-
.../SymbolFile/DWARF/DWARFASTParserClang.cpp | 20 +-
.../SymbolFile/DWARF/SymbolFileDWARF.cpp | 16 +-
lldb/source/Symbol/Function.cpp | 17 +-
lldb/source/Target/RegisterContextUnwind.cpp | 23 +-
lldb/source/Target/StackFrame.cpp | 19 +-
.../Expression/DWARFExpressionTest.cpp | 78 +-
11 files changed, 401 insertions(+), 578 deletions(-)
diff --git a/lldb/include/lldb/Expression/DWARFExpression.h b/lldb/include/lldb/Expression/DWARFExpression.h
index 1d85308d1caa7..e85ba464dea6b 100644
--- a/lldb/include/lldb/Expression/DWARFExpression.h
+++ b/lldb/include/lldb/Expression/DWARFExpression.h
@@ -132,13 +132,12 @@ class DWARFExpression {
/// \return
/// True on success; false otherwise. If error_ptr is non-NULL,
/// details of the failure are provided through it.
- static bool Evaluate(ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
- lldb::ModuleSP module_sp, const DataExtractor &opcodes,
- const plugin::dwarf::DWARFUnit *dwarf_cu,
- const lldb::RegisterKind reg_set,
- const Value *initial_value_ptr,
- const Value *object_address_ptr, Value &result,
- Status *error_ptr);
+ static llvm::Expected<Value>
+ Evaluate(ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
+ lldb::ModuleSP module_sp, const DataExtractor &opcodes,
+ const plugin::dwarf::DWARFUnit *dwarf_cu,
+ const lldb::RegisterKind reg_set, const Value *initial_value_ptr,
+ const Value *object_address_ptr);
static bool ParseDWARFLocationList(const plugin::dwarf::DWARFUnit *dwarf_cu,
const DataExtractor &data,
diff --git a/lldb/include/lldb/Expression/DWARFExpressionList.h b/lldb/include/lldb/Expression/DWARFExpressionList.h
index c2218ad4af0a7..f711a1cbe9bbd 100644
--- a/lldb/include/lldb/Expression/DWARFExpressionList.h
+++ b/lldb/include/lldb/Expression/DWARFExpressionList.h
@@ -9,6 +9,7 @@
#ifndef LLDB_EXPRESSION_DWARFEXPRESSIONLIST_H
#define LLDB_EXPRESSION_DWARFEXPRESSIONLIST_H
+#include "lldb/Core/Value.h"
#include "lldb/Expression/DWARFExpression.h"
#include "lldb/Utility/RangeMap.h"
#include "lldb/lldb-private.h"
@@ -113,10 +114,11 @@ class DWARFExpressionList {
void SetModule(const lldb::ModuleSP &module) { m_module_wp = module; }
- bool Evaluate(ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
- lldb::addr_t func_load_addr, const Value *initial_value_ptr,
- const Value *object_address_ptr, Value &result,
- Status *error_ptr) const;
+ llvm::Expected<Value> Evaluate(ExecutionContext *exe_ctx,
+ RegisterContext *reg_ctx,
+ lldb::addr_t func_load_addr,
+ const Value *initial_value_ptr,
+ const Value *object_address_ptr) const;
private:
// RangeDataVector requires a comparator for DWARFExpression, but it doesn't
diff --git a/lldb/source/Core/ValueObjectVariable.cpp b/lldb/source/Core/ValueObjectVariable.cpp
index 67d71c90a959d..51eb11d3a189e 100644
--- a/lldb/source/Core/ValueObjectVariable.cpp
+++ b/lldb/source/Core/ValueObjectVariable.cpp
@@ -164,8 +164,11 @@ bool ValueObjectVariable::UpdateValue() {
target);
}
Value old_value(m_value);
- if (expr_list.Evaluate(&exe_ctx, nullptr, loclist_base_load_addr, nullptr,
- nullptr, m_value, &m_error)) {
+ llvm::Expected<Value> maybe_value = expr_list.Evaluate(
+ &exe_ctx, nullptr, loclist_base_load_addr, nullptr, nullptr);
+
+ if (maybe_value) {
+ m_value = *maybe_value;
m_resolved_value = m_value;
m_value.SetContext(Value::ContextType::Variable, variable);
@@ -246,6 +249,7 @@ bool ValueObjectVariable::UpdateValue() {
SetValueIsValid(m_error.Success());
} else {
+ m_error = maybe_value.takeError();
// could not find location, won't allow editing
m_resolved_value.SetContext(Value::ContextType::Invalid, nullptr);
}
diff --git a/lldb/source/Expression/DWARFExpression.cpp b/lldb/source/Expression/DWARFExpression.cpp
index 7473bb8255d0a..5c7ab49410efe 100644
--- a/lldb/source/Expression/DWARFExpression.cpp
+++ b/lldb/source/Expression/DWARFExpression.cpp
@@ -541,12 +541,12 @@ bool DWARFExpression::LinkThreadLocalStorage(
return true;
}
-static bool Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
- ExecutionContext *exe_ctx,
- RegisterContext *reg_ctx,
- const DataExtractor &opcodes,
- lldb::offset_t &opcode_offset,
- Status *error_ptr, Log *log) {
+static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
+ ExecutionContext *exe_ctx,
+ RegisterContext *reg_ctx,
+ const DataExtractor &opcodes,
+ lldb::offset_t &opcode_offset,
+ Log *log) {
// DW_OP_entry_value(sub-expr) describes the location a variable had upon
// function entry: this variable location is presumed to be optimized out at
// the current PC value. The caller of the function may have call site
@@ -593,16 +593,15 @@ static bool Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
// 1. Find the function which pushed the current frame onto the stack.
if ((!exe_ctx || !exe_ctx->HasTargetScope()) || !reg_ctx) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no exe/reg context");
- return false;
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: no exe/reg context");
}
StackFrame *current_frame = exe_ctx->GetFramePtr();
Thread *thread = exe_ctx->GetThreadPtr();
- if (!current_frame || !thread) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no current frame/thread");
- return false;
- }
+ if (!current_frame || !thread)
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: no current frame/thread");
Target &target = exe_ctx->GetTargetRef();
StackFrameSP parent_frame = nullptr;
@@ -634,25 +633,23 @@ static bool Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
break;
}
if (!parent_frame || !parent_frame->GetRegisterContext()) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no parent frame with reg ctx");
- return false;
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: no parent frame with reg ctx");
}
Function *parent_func =
parent_frame->GetSymbolContext(eSymbolContextFunction).function;
- if (!parent_func) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no parent function");
- return false;
- }
+ if (!parent_func)
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: no parent function");
// 2. Find the call edge in the parent function responsible for creating the
// current activation.
Function *current_func =
current_frame->GetSymbolContext(eSymbolContextFunction).function;
- if (!current_func) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no current function");
- return false;
- }
+ if (!current_func)
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: no current function");
CallEdge *call_edge = nullptr;
ModuleList &modlist = target.GetImages();
@@ -663,17 +660,16 @@ static bool Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
// produced by an ambiguous tail call. In this case, refuse to proceed.
call_edge = parent_func->GetCallEdgeForReturnAddress(return_pc, target);
if (!call_edge) {
- LLDB_LOG(log,
- "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} "
- "in parent frame {1}",
- return_pc, parent_func->GetName());
- return false;
+ return llvm::createStringError(llvm::formatv(
+ "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} "
+ "in parent frame {1}",
+ return_pc, parent_func->GetName()));
}
Function *callee_func = call_edge->GetCallee(modlist, parent_exe_ctx);
if (callee_func != current_func) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: ambiguous call sequence, "
- "can't find real parent frame");
- return false;
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: ambiguous call sequence, "
+ "can't find real parent frame");
}
} else {
// The StackFrameList solver machinery has deduced that an unambiguous tail
@@ -686,21 +682,19 @@ static bool Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
}
}
}
- if (!call_edge) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: no unambiguous edge from parent "
- "to current function");
- return false;
- }
+ if (!call_edge)
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: no unambiguous edge from parent "
+ "to current function");
// 3. Attempt to locate the DW_OP_entry_value expression in the set of
// available call site parameters. If found, evaluate the corresponding
// parameter in the context of the parent frame.
const uint32_t subexpr_len = opcodes.GetULEB128(&opcode_offset);
const void *subexpr_data = opcodes.GetData(&opcode_offset, subexpr_len);
- if (!subexpr_data) {
- LLDB_LOG(log, "Evaluate_DW_OP_entry_value: subexpr could not be read");
- return false;
- }
+ if (!subexpr_data)
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: subexpr could not be read");
const CallSiteParameter *matched_param = nullptr;
for (const CallSiteParameter ¶m : call_edge->GetCallSiteParameters()) {
@@ -726,28 +720,27 @@ static bool Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
break;
}
}
- if (!matched_param) {
- LLDB_LOG(log,
- "Evaluate_DW_OP_entry_value: no matching call site param found");
- return false;
- }
+ if (!matched_param)
+ return llvm::createStringError(
+ "Evaluate_DW_OP_entry_value: no matching call site param found");
// TODO: Add support for DW_OP_push_object_address within a DW_OP_entry_value
// subexpresion whenever llvm does.
- Value result;
const DWARFExpressionList ¶m_expr = matched_param->LocationInCaller;
- if (!param_expr.Evaluate(&parent_exe_ctx,
- parent_frame->GetRegisterContext().get(),
- LLDB_INVALID_ADDRESS,
- /*initial_value_ptr=*/nullptr,
- /*object_address_ptr=*/nullptr, result, error_ptr)) {
+
+ llvm::Expected<Value> maybe_result = param_expr.Evaluate(
+ &parent_exe_ctx, parent_frame->GetRegisterContext().get(),
+ LLDB_INVALID_ADDRESS,
+ /*initial_value_ptr=*/nullptr,
+ /*object_address_ptr=*/nullptr);
+ if (!maybe_result) {
LLDB_LOG(log,
"Evaluate_DW_OP_entry_value: call site param evaluation failed");
- return false;
+ return maybe_result.takeError();
}
- stack.push_back(result);
- return true;
+ stack.push_back(*maybe_result);
+ return llvm::Error::success();
}
namespace {
@@ -862,19 +855,15 @@ static Scalar DerefSizeExtractDataHelper(uint8_t *addr_bytes,
return addr_data.GetAddress(&addr_data_offset);
}
-bool DWARFExpression::Evaluate(
+llvm::Expected<Value> DWARFExpression::Evaluate(
ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
lldb::ModuleSP module_sp, const DataExtractor &opcodes,
const DWARFUnit *dwarf_cu, const lldb::RegisterKind reg_kind,
- const Value *initial_value_ptr, const Value *object_address_ptr,
- Value &result, Status *error_ptr) {
+ const Value *initial_value_ptr, const Value *object_address_ptr) {
- if (opcodes.GetByteSize() == 0) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "no location, value may have been optimized out");
- return false;
- }
+ if (opcodes.GetByteSize() == 0)
+ return llvm::createStringError(
+ "no location, value may have been optimized out");
std::vector<Value> stack;
Process *process = nullptr;
@@ -994,11 +983,9 @@ bool DWARFExpression::Evaluate(
// retrieved from the dereferenced address is the size of an address on the
// target machine.
case DW_OP_deref: {
- if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString("Expression stack empty for DW_OP_deref.");
- return false;
- }
+ if (stack.empty())
+ return llvm::createStringError(
+ "Expression stack empty for DW_OP_deref.");
Value::ValueType value_type = stack.back().GetValueType();
switch (value_type) {
case Value::ValueType::HostAddress: {
@@ -1013,11 +1000,12 @@ bool DWARFExpression::Evaluate(
LLDB_INVALID_ADDRESS);
Address so_addr;
+ Status load_err;
auto maybe_load_addr = ResolveLoadAddress(
- exe_ctx, module_sp, error_ptr, "DW_OP_deref", file_addr, so_addr);
+ exe_ctx, module_sp, &load_err, "DW_OP_deref", file_addr, so_addr);
if (!maybe_load_addr)
- return false;
+ return load_err.ToError();
stack.back().GetScalar() = *maybe_load_addr;
// Fall through to load address promotion code below.
@@ -1041,30 +1029,22 @@ bool DWARFExpression::Evaluate(
stack.back().GetScalar() = pointer_value;
stack.back().ClearContext();
} else {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "Failed to dereference pointer from 0x%" PRIx64
- " for DW_OP_deref: %s\n",
- pointer_addr, error.AsCString());
- return false;
+ return llvm::createStringError(
+ "Failed to dereference pointer from 0x%" PRIx64
+ " for DW_OP_deref: %s\n",
+ pointer_addr, error.AsCString());
}
} else {
- if (error_ptr)
- error_ptr->SetErrorString("NULL process for DW_OP_deref.\n");
- return false;
+ return llvm::createStringError("NULL process for DW_OP_deref.\n");
}
} else {
- if (error_ptr)
- error_ptr->SetErrorString(
- "NULL execution context for DW_OP_deref.\n");
- return false;
+ return llvm::createStringError(
+ "NULL execution context for DW_OP_deref.\n");
}
break;
case Value::ValueType::Invalid:
- if (error_ptr)
- error_ptr->SetErrorString("Invalid value type for DW_OP_deref.\n");
- return false;
+ return llvm::createStringError("Invalid value type for DW_OP_deref.\n");
}
} break;
@@ -1083,18 +1063,13 @@ bool DWARFExpression::Evaluate(
// expression stack.
case DW_OP_deref_size: {
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack empty for DW_OP_deref_size.");
- return false;
+ return llvm::createStringError(
+ "Expression stack empty for DW_OP_deref_size.");
}
uint8_t size = opcodes.GetU8(&offset);
if (size > 8) {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "Invalid address size for DW_OP_deref_size: %d\n",
- size);
- return false;
+ return llvm::createStringError(
+ "Invalid address size for DW_OP_deref_size: %d\n", size);
}
Value::ValueType value_type = stack.back().GetValueType();
switch (value_type) {
@@ -1142,13 +1117,14 @@ bool DWARFExpression::Evaluate(
auto file_addr =
stack.back().GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
Address so_addr;
+ Status resolve_err;
auto maybe_load_addr =
- ResolveLoadAddress(exe_ctx, module_sp, error_ptr,
- "DW_OP_deref_size", file_addr, so_addr,
- /*check_sectionoffset=*/true);
+ ResolveLoadAddress(exe_ctx, module_sp, &resolve_err,
+ "DW_OP_deref_size", file_addr, so_addr,
+ /*check_sectionoffset=*/true);
if (!maybe_load_addr)
- return false;
+ return resolve_err.ToError();
addr_t load_addr = *maybe_load_addr;
@@ -1166,12 +1142,10 @@ bool DWARFExpression::Evaluate(
stack.back().ClearContext();
break;
} else {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "Failed to dereference pointer for DW_OP_deref_size: "
- "%s\n",
- error.AsCString());
- return false;
+ return llvm::createStringError(
+ "Failed to dereference pointer for DW_OP_deref_size: "
+ "%s\n",
+ error.AsCString());
}
}
stack.back().GetScalar() = load_addr;
@@ -1195,30 +1169,25 @@ bool DWARFExpression::Evaluate(
process->GetByteOrder(), size);
stack.back().ClearContext();
} else {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "Failed to dereference pointer from 0x%" PRIx64
- " for DW_OP_deref: %s\n",
- pointer_addr, error.AsCString());
- return false;
+ return llvm::createStringError(
+ "Failed to dereference pointer from 0x%" PRIx64
+ " for DW_OP_deref: %s\n",
+ pointer_addr, error.AsCString());
}
} else {
- if (error_ptr)
- error_ptr->SetErrorString("NULL process for DW_OP_deref_size.\n");
- return false;
+
+ return llvm::createStringError(
+ "NULL process for DW_OP_deref_size.\n");
}
} else {
- if (error_ptr)
- error_ptr->SetErrorString(
- "NULL execution context for DW_OP_deref_size.\n");
- return false;
+ return llvm::createStringError(
+ "NULL execution context for DW_OP_deref_size.\n");
}
break;
case Value::ValueType::Invalid:
- if (error_ptr)
- error_ptr->SetErrorString("Invalid value for DW_OP_deref_size.\n");
- return false;
+
+ return llvm::createStringError("Invalid value for DW_OP_deref_size.\n");
}
} break;
@@ -1239,9 +1208,9 @@ bool DWARFExpression::Evaluate(
// extended to the size of an address on the target machine before being
// pushed on the expression stack.
case DW_OP_xderef_size:
- if (error_ptr)
- error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef_size.");
- return false;
+
+ return llvm::createStringError(
+ "Unimplemented opcode: DW_OP_xderef_size.");
// OPCODE: DW_OP_xderef
// OPERANDS: none
// DESCRIPTION: Provides an extended dereference mechanism. The entry at
@@ -1253,9 +1222,7 @@ bool DWARFExpression::Evaluate(
// retrieved from the dereferenced address is the size of an address on the
// target machine.
case DW_OP_xderef:
- if (error_ptr)
- error_ptr->SetErrorString("Unimplemented opcode: DW_OP_xderef.");
- return false;
+ return llvm::createStringError("Unimplemented opcode: DW_OP_xderef.");
// All DW_OP_constXXX opcodes have a single operand as noted below:
//
@@ -1308,9 +1275,7 @@ bool DWARFExpression::Evaluate(
// DESCRIPTION: duplicates the value at the top of the stack
case DW_OP_dup:
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString("Expression stack empty for DW_OP_dup.");
- return false;
+ return llvm::createStringError("Expression stack empty for DW_OP_dup.");
} else
stack.push_back(stack.back());
break;
@@ -1320,9 +1285,8 @@ bool DWARFExpression::Evaluate(
// DESCRIPTION: pops the value at the top of the stack
case DW_OP_drop:
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString("Expression stack empty for DW_OP_drop.");
- return false;
+ return llvm::createStringError(
+ "Expression stack empty for DW_OP_drop.");
} else
stack.pop_back();
break;
@@ -1333,10 +1297,8 @@ bool DWARFExpression::Evaluate(
// the top of the stack.
case DW_OP_over:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_over.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_over.");
} else
stack.push_back(stack[stack.size() - 2]);
break;
@@ -1350,10 +1312,8 @@ bool DWARFExpression::Evaluate(
if (pick_idx < stack.size())
stack.push_back(stack[stack.size() - 1 - pick_idx]);
else {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "Index %u out of range for DW_OP_pick.\n", pick_idx);
- return false;
+ return llvm::createStringError(
+ "Index %u out of range for DW_OP_pick.\n", pick_idx);
}
} break;
@@ -1364,10 +1324,8 @@ bool DWARFExpression::Evaluate(
// becomes the top of the stack
case DW_OP_swap:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_swap.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_swap.");
} else {
tmp = stack.back();
stack.back() = stack[stack.size() - 2];
@@ -1383,10 +1341,8 @@ bool DWARFExpression::Evaluate(
// entry.
case DW_OP_rot:
if (stack.size() < 3) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 3 items for DW_OP_rot.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 3 items for DW_OP_rot.");
} else {
size_t last_idx = stack.size() - 1;
Value old_top = stack[last_idx];
@@ -1403,15 +1359,11 @@ bool DWARFExpression::Evaluate(
// represented, the result is undefined.
case DW_OP_abs:
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_abs.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_abs.");
} else if (!stack.back().ResolveValue(exe_ctx).AbsoluteValue()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Failed to take the absolute value of the first stack item.");
- return false;
+ return llvm::createStringError(
+ "Failed to take the absolute value of the first stack item.");
}
break;
@@ -1421,10 +1373,8 @@ bool DWARFExpression::Evaluate(
// operation on the two, and pushes the result.
case DW_OP_and:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_and.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_and.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1440,16 +1390,12 @@ bool DWARFExpression::Evaluate(
// the result.
case DW_OP_div:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_div.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_div.");
} else {
tmp = stack.back();
if (tmp.ResolveValue(exe_ctx).IsZero()) {
- if (error_ptr)
- error_ptr->SetErrorString("Divide by zero.");
- return false;
+ return llvm::createStringError("Divide by zero.");
} else {
stack.pop_back();
Scalar divisor, dividend;
@@ -1459,9 +1405,7 @@ bool DWARFExpression::Evaluate(
dividend.MakeSigned();
stack.back() = dividend / divisor;
if (!stack.back().ResolveValue(exe_ctx).IsValid()) {
- if (error_ptr)
- error_ptr->SetErrorString("Divide failed.");
- return false;
+ return llvm::createStringError("Divide failed.");
}
}
}
@@ -1473,10 +1417,8 @@ bool DWARFExpression::Evaluate(
// of the stack from the former second entry, and pushes the result.
case DW_OP_minus:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_minus.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_minus.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1492,10 +1434,8 @@ bool DWARFExpression::Evaluate(
// stack.
case DW_OP_mod:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_mod.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_mod.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1510,10 +1450,8 @@ bool DWARFExpression::Evaluate(
// together, and pushes the result.
case DW_OP_mul:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_mul.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_mul.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1527,16 +1465,11 @@ bool DWARFExpression::Evaluate(
// DESCRIPTION: pops the top stack entry, and pushes its negation.
case DW_OP_neg:
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_neg.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_neg.");
} else {
- if (!stack.back().ResolveValue(exe_ctx).UnaryNegate()) {
- if (error_ptr)
- error_ptr->SetErrorString("Unary negate failed.");
- return false;
- }
+ if (!stack.back().ResolveValue(exe_ctx).UnaryNegate())
+ return llvm::createStringError("Unary negate failed.");
}
break;
@@ -1546,15 +1479,11 @@ bool DWARFExpression::Evaluate(
// complement
case DW_OP_not:
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_not.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_not.");
} else {
if (!stack.back().ResolveValue(exe_ctx).OnesComplement()) {
- if (error_ptr)
- error_ptr->SetErrorString("Logical NOT failed.");
- return false;
+ return llvm::createStringError("Logical NOT failed.");
}
}
break;
@@ -1565,10 +1494,8 @@ bool DWARFExpression::Evaluate(
// operation on the two, and pushes the result.
case DW_OP_or:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_or.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_or.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1583,10 +1510,8 @@ bool DWARFExpression::Evaluate(
// pushes the result.
case DW_OP_plus:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_plus.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_plus.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1600,18 +1525,15 @@ bool DWARFExpression::Evaluate(
// constant operand and pushes the result.
case DW_OP_plus_uconst:
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_plus_uconst.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_plus_uconst.");
} else {
const uint64_t uconst_value = opcodes.GetULEB128(&offset);
// Implicit conversion from a UINT to a Scalar...
stack.back().GetScalar() += uconst_value;
if (!stack.back().GetScalar().IsValid()) {
- if (error_ptr)
- error_ptr->SetErrorString("DW_OP_plus_uconst failed.");
- return false;
+
+ return llvm::createStringError("DW_OP_plus_uconst failed.");
}
}
break;
@@ -1623,10 +1545,8 @@ bool DWARFExpression::Evaluate(
// the stack, and pushes the result.
case DW_OP_shl:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_shl.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_shl.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1641,18 +1561,14 @@ bool DWARFExpression::Evaluate(
// specified by the former top of the stack, and pushes the result.
case DW_OP_shr:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_shr.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_shr.");
} else {
tmp = stack.back();
stack.pop_back();
if (!stack.back().ResolveValue(exe_ctx).ShiftRightLogical(
tmp.ResolveValue(exe_ctx))) {
- if (error_ptr)
- error_ptr->SetErrorString("DW_OP_shr failed.");
- return false;
+ return llvm::createStringError("DW_OP_shr failed.");
}
}
break;
@@ -1665,10 +1581,8 @@ bool DWARFExpression::Evaluate(
// of the stack, and pushes the result.
case DW_OP_shra:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_shra.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_shra.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1682,10 +1596,8 @@ bool DWARFExpression::Evaluate(
// exclusive-or operation on the two, and pushes the result.
case DW_OP_xor:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_xor.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_xor.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1709,11 +1621,9 @@ bool DWARFExpression::Evaluate(
if (new_offset <= opcodes.GetByteSize())
offset = new_offset;
else {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormatv(
- "Invalid opcode offset in DW_OP_skip: {0}+({1}) > {2}", offset,
- skip_offset, opcodes.GetByteSize());
- return false;
+ return llvm::createStringError(llvm::formatv(
+ "Invalid opcode offset in DW_OP_skip: {0}+({1}) > {2}", offset,
+ skip_offset, opcodes.GetByteSize()));
}
} break;
@@ -1726,10 +1636,8 @@ bool DWARFExpression::Evaluate(
// the current operation, beginning after the 2-byte constant.
case DW_OP_bra:
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_bra.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_bra.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1743,11 +1651,9 @@ bool DWARFExpression::Evaluate(
if (new_offset <= opcodes.GetByteSize())
offset = new_offset;
else {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormatv(
- "Invalid opcode offset in DW_OP_bra: {0}+({1}) > {2}", offset,
- bra_offset, opcodes.GetByteSize());
- return false;
+ return llvm::createStringError(llvm::formatv(
+ "Invalid opcode offset in DW_OP_bra: {0}+({1}) > {2}", offset,
+ bra_offset, opcodes.GetByteSize()));
}
}
}
@@ -1762,10 +1668,8 @@ bool DWARFExpression::Evaluate(
// operation is false.
case DW_OP_eq:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_eq.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_eq.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1783,10 +1687,8 @@ bool DWARFExpression::Evaluate(
// operation is false.
case DW_OP_ge:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_ge.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_ge.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1804,10 +1706,8 @@ bool DWARFExpression::Evaluate(
// operation is false.
case DW_OP_gt:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_gt.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_gt.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1825,10 +1725,8 @@ bool DWARFExpression::Evaluate(
// operation is false.
case DW_OP_le:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_le.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_le.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1846,10 +1744,8 @@ bool DWARFExpression::Evaluate(
// operation is false.
case DW_OP_lt:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_lt.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_lt.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1867,10 +1763,8 @@ bool DWARFExpression::Evaluate(
// operation is false.
case DW_OP_ne:
if (stack.size() < 2) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 2 items for DW_OP_ne.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 2 items for DW_OP_ne.");
} else {
tmp = stack.back();
stack.pop_back();
@@ -1957,10 +1851,11 @@ bool DWARFExpression::Evaluate(
dwarf4_location_description_kind = Register;
reg_num = op - DW_OP_reg0;
- if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, tmp))
+ Status read_err;
+ if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, &read_err, tmp))
stack.push_back(tmp);
else
- return false;
+ return read_err.ToError();
} break;
// OPCODE: DW_OP_regx
// OPERANDS:
@@ -1969,10 +1864,11 @@ bool DWARFExpression::Evaluate(
case DW_OP_regx: {
dwarf4_location_description_kind = Register;
reg_num = opcodes.GetULEB128(&offset);
- if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr, tmp))
+ Status read_err;
+ if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, &read_err, tmp))
stack.push_back(tmp);
else
- return false;
+ return read_err.ToError();
} break;
// OPCODE: DW_OP_bregN
@@ -2014,7 +1910,8 @@ bool DWARFExpression::Evaluate(
case DW_OP_breg31: {
reg_num = op - DW_OP_breg0;
- if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr,
+ Status read_err;
+ if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, &read_err,
tmp)) {
int64_t breg_offset = opcodes.GetSLEB128(&offset);
tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
@@ -2022,7 +1919,7 @@ bool DWARFExpression::Evaluate(
stack.push_back(tmp);
stack.back().SetValueType(Value::ValueType::LoadAddress);
} else
- return false;
+ return read_err.ToError();
} break;
// OPCODE: DW_OP_bregx
// OPERANDS: 2
@@ -2033,7 +1930,8 @@ bool DWARFExpression::Evaluate(
case DW_OP_bregx: {
reg_num = opcodes.GetULEB128(&offset);
- if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, error_ptr,
+ Status read_err;
+ if (ReadRegisterValueAsScalar(reg_ctx, reg_kind, reg_num, &read_err,
tmp)) {
int64_t breg_offset = opcodes.GetSLEB128(&offset);
tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
@@ -2041,31 +1939,28 @@ bool DWARFExpression::Evaluate(
stack.push_back(tmp);
stack.back().SetValueType(Value::ValueType::LoadAddress);
} else
- return false;
+ return read_err.ToError();
} break;
case DW_OP_fbreg:
if (exe_ctx) {
if (frame) {
Scalar value;
- if (frame->GetFrameBaseValue(value, error_ptr)) {
+ Status fb_err;
+ if (frame->GetFrameBaseValue(value, &fb_err)) {
int64_t fbreg_offset = opcodes.GetSLEB128(&offset);
value += fbreg_offset;
stack.push_back(value);
stack.back().SetValueType(Value::ValueType::LoadAddress);
} else
- return false;
+ return fb_err.ToError();
} else {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Invalid stack frame in context for DW_OP_fbreg opcode.");
- return false;
+ return llvm::createStringError(
+ "Invalid stack frame in context for DW_OP_fbreg opcode.");
}
} else {
- if (error_ptr)
- error_ptr->SetErrorString(
- "NULL execution context for DW_OP_fbreg.\n");
- return false;
+ return llvm::createStringError(
+ "NULL execution context for DW_OP_fbreg.\n");
}
break;
@@ -2127,7 +2022,7 @@ bool DWARFExpression::Evaluate(
const lldb::addr_t addr = scalar.ULongLong(LLDB_INVALID_ADDRESS);
switch (curr_piece_source_value_type) {
case Value::ValueType::Invalid:
- return false;
+ return llvm::createStringError("invalid value type");
case Value::ValueType::LoadAddress:
case Value::ValueType::FileAddress: {
if (target) {
@@ -2136,35 +2031,28 @@ bool DWARFExpression::Evaluate(
piece_byte_size, error,
/*force_live_memory=*/false) !=
piece_byte_size) {
- if (error_ptr) {
- const char *addr_type = (curr_piece_source_value_type ==
- Value::ValueType::LoadAddress)
- ? "load"
- : "file";
- error_ptr->SetErrorStringWithFormat(
- "failed to read memory DW_OP_piece(%" PRIu64
- ") from %s address 0x%" PRIx64,
- piece_byte_size, addr_type, addr);
- }
- return false;
+ const char *addr_type = (curr_piece_source_value_type ==
+ Value::ValueType::LoadAddress)
+ ? "load"
+ : "file";
+ return llvm::createStringError(
+ "failed to read memory DW_OP_piece(%" PRIu64
+ ") from %s address 0x%" PRIx64,
+ piece_byte_size, addr_type, addr);
}
} else {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "failed to resize the piece memory buffer for "
- "DW_OP_piece(%" PRIu64 ")",
- piece_byte_size);
- return false;
+ return llvm::createStringError(
+ "failed to resize the piece memory buffer for "
+ "DW_OP_piece(%" PRIu64 ")",
+ piece_byte_size);
}
}
} break;
case Value::ValueType::HostAddress: {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "failed to read memory DW_OP_piece(%" PRIu64
- ") from host address 0x%" PRIx64,
- piece_byte_size, addr);
- return false;
+ return llvm::createStringError(
+ "failed to read memory DW_OP_piece(%" PRIu64
+ ") from host address 0x%" PRIx64,
+ piece_byte_size, addr);
} break;
case Value::ValueType::Scalar: {
@@ -2172,14 +2060,11 @@ bool DWARFExpression::Evaluate(
uint32_t bit_offset = 0;
if (!scalar.ExtractBitfield(
bit_size, bit_offset)) {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "unable to extract %" PRIu64 " bytes from a %" PRIu64
- " byte scalar value.",
- piece_byte_size,
- (uint64_t)curr_piece_source_value.GetScalar()
- .GetByteSize());
- return false;
+ return llvm::createStringError(
+ "unable to extract %" PRIu64 " bytes from a %" PRIu64
+ " byte scalar value.",
+ piece_byte_size,
+ (uint64_t)curr_piece_source_value.GetScalar().GetByteSize());
}
// Create curr_piece with bit_size. By default Scalar
// grows to the nearest host integer type.
@@ -2198,27 +2083,20 @@ bool DWARFExpression::Evaluate(
// so subsequent pieces will be able to access this piece and add
// to it.
if (pieces.AppendDataToHostBuffer(curr_piece) == 0) {
- if (error_ptr)
- error_ptr->SetErrorString("failed to append piece data");
- return false;
+ return llvm::createStringError("failed to append piece data");
}
} else {
// If this is the second or later piece there should be a value on
// the stack.
if (pieces.GetBuffer().GetByteSize() != op_piece_offset) {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "DW_OP_piece for offset %" PRIu64
- " but top of stack is of size %" PRIu64,
- op_piece_offset, pieces.GetBuffer().GetByteSize());
- return false;
+ return llvm::createStringError(
+ "DW_OP_piece for offset %" PRIu64
+ " but top of stack is of size %" PRIu64,
+ op_piece_offset, pieces.GetBuffer().GetByteSize());
}
- if (pieces.AppendDataToHostBuffer(curr_piece) == 0) {
- if (error_ptr)
- error_ptr->SetErrorString("failed to append piece data");
- return false;
- }
+ if (pieces.AppendDataToHostBuffer(curr_piece) == 0)
+ return llvm::createStringError("failed to append piece data");
}
}
op_piece_offset += piece_byte_size;
@@ -2231,10 +2109,8 @@ bool DWARFExpression::Evaluate(
LocationDescriptionKind::Empty);
// Reset for the next piece.
dwarf4_location_description_kind = Memory;
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_bit_piece.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_bit_piece.");
} else {
UpdateValueTypeFromLocationDescription(
log, dwarf_cu, dwarf4_location_description_kind, &stack.back());
@@ -2244,30 +2120,26 @@ bool DWARFExpression::Evaluate(
const uint64_t piece_bit_offset = opcodes.GetULEB128(&offset);
switch (stack.back().GetValueType()) {
case Value::ValueType::Invalid:
- return false;
+ return llvm::createStringError(
+ "unable to extract bit value from invalid value.");
case Value::ValueType::Scalar: {
if (!stack.back().GetScalar().ExtractBitfield(piece_bit_size,
piece_bit_offset)) {
- if (error_ptr)
- error_ptr->SetErrorStringWithFormat(
- "unable to extract %" PRIu64 " bit value with %" PRIu64
- " bit offset from a %" PRIu64 " bit scalar value.",
- piece_bit_size, piece_bit_offset,
- (uint64_t)(stack.back().GetScalar().GetByteSize() * 8));
- return false;
+ return llvm::createStringError(
+ "unable to extract %" PRIu64 " bit value with %" PRIu64
+ " bit offset from a %" PRIu64 " bit scalar value.",
+ piece_bit_size, piece_bit_offset,
+ (uint64_t)(stack.back().GetScalar().GetByteSize() * 8));
}
} break;
case Value::ValueType::FileAddress:
case Value::ValueType::LoadAddress:
case Value::ValueType::HostAddress:
- if (error_ptr) {
- error_ptr->SetErrorStringWithFormat(
- "unable to extract DW_OP_bit_piece(bit_size = %" PRIu64
- ", bit_offset = %" PRIu64 ") from an address value.",
- piece_bit_size, piece_bit_offset);
- }
- return false;
+ return llvm::createStringError(
+ "unable to extract DW_OP_bit_piece(bit_size = %" PRIu64
+ ", bit_offset = %" PRIu64 ") from an address value.",
+ piece_bit_size, piece_bit_offset);
}
}
break;
@@ -2287,9 +2159,8 @@ bool DWARFExpression::Evaluate(
if (!data) {
LLDB_LOG(log, "Evaluate_DW_OP_implicit_value: could not be read data");
- LLDB_ERRORF(error_ptr, "Could not evaluate %s.",
- DW_OP_value_to_name(op));
- return false;
+ return llvm::createStringError("Could not evaluate %s.",
+ DW_OP_value_to_name(op));
}
Value result(data, len);
@@ -2299,8 +2170,8 @@ bool DWARFExpression::Evaluate(
case DW_OP_implicit_pointer: {
dwarf4_location_description_kind = Implicit;
- LLDB_ERRORF(error_ptr, "Could not evaluate %s.", DW_OP_value_to_name(op));
- return false;
+ return llvm::createStringError("Could not evaluate %s.",
+ DW_OP_value_to_name(op));
}
// OPCODE: DW_OP_push_object_address
@@ -2315,10 +2186,8 @@ bool DWARFExpression::Evaluate(
if (object_address_ptr)
stack.push_back(*object_address_ptr);
else {
- if (error_ptr)
- error_ptr->SetErrorString("DW_OP_push_object_address used without "
- "specifying an object address");
- return false;
+ return llvm::createStringError("DW_OP_push_object_address used without "
+ "specifying an object address");
}
break;
@@ -2341,9 +2210,7 @@ bool DWARFExpression::Evaluate(
// the stack by the called expression may be used as return values by prior
// agreement between the calling and called expressions.
case DW_OP_call2:
- if (error_ptr)
- error_ptr->SetErrorString("Unimplemented opcode DW_OP_call2.");
- return false;
+ return llvm::createStringError("Unimplemented opcode DW_OP_call2.");
// OPCODE: DW_OP_call4
// OPERANDS: 1
// uint32_t compile unit relative offset of a DIE
@@ -2364,9 +2231,8 @@ bool DWARFExpression::Evaluate(
// the stack by the called expression may be used as return values by prior
// agreement between the calling and called expressions.
case DW_OP_call4:
- if (error_ptr)
- error_ptr->SetErrorString("Unimplemented opcode DW_OP_call4.");
- return false;
+
+ return llvm::createStringError("Unimplemented opcode DW_OP_call4.");
// OPCODE: DW_OP_stack_value
// OPERANDS: None
@@ -2376,10 +2242,8 @@ bool DWARFExpression::Evaluate(
case DW_OP_stack_value:
dwarf4_location_description_kind = Implicit;
if (stack.empty()) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_stack_value.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_stack_value.");
}
stack.back().SetValueType(Value::ValueType::Scalar);
break;
@@ -2393,10 +2257,8 @@ bool DWARFExpression::Evaluate(
// different type, and push the result.
case DW_OP_convert: {
if (stack.size() < 1) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "Expression stack needs at least 1 item for DW_OP_convert.");
- return false;
+ return llvm::createStringError(
+ "Expression stack needs at least 1 item for DW_OP_convert.");
}
const uint64_t die_offset = opcodes.GetULEB128(&offset);
uint64_t bit_size;
@@ -2405,39 +2267,29 @@ bool DWARFExpression::Evaluate(
// The generic type has the size of an address on the target
// machine and an unspecified signedness. Scalar has no
// "unspecified signedness", so we use unsigned types.
- if (!module_sp) {
- if (error_ptr)
- error_ptr->SetErrorString("No module");
- return false;
- }
+ if (!module_sp)
+ return llvm::createStringError("No module");
sign = false;
bit_size = module_sp->GetArchitecture().GetAddressByteSize() * 8;
- if (!bit_size) {
- if (error_ptr)
- error_ptr->SetErrorString("unspecified architecture");
- return false;
- }
+ if (!bit_size)
+ return llvm::createStringError("unspecified architecture");
} else {
// Retrieve the type DIE that the value is being converted to. This
// offset is compile unit relative so we need to fix it up.
const uint64_t abs_die_offset = die_offset + dwarf_cu->GetOffset();
// FIXME: the constness has annoying ripple effects.
DWARFDIE die = const_cast<DWARFUnit *>(dwarf_cu)->GetDIE(abs_die_offset);
- if (!die) {
- if (error_ptr)
- error_ptr->SetErrorString("Cannot resolve DW_OP_convert type DIE");
- return false;
- }
+ if (!die)
+ return llvm::createStringError(
+ "Cannot resolve DW_OP_convert type DIE");
uint64_t encoding =
die.GetAttributeValueAsUnsigned(DW_AT_encoding, DW_ATE_hi_user);
bit_size = die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 0) * 8;
if (!bit_size)
bit_size = die.GetAttributeValueAsUnsigned(DW_AT_bit_size, 0);
- if (!bit_size) {
- if (error_ptr)
- error_ptr->SetErrorString("Unsupported type size in DW_OP_convert");
- return false;
- }
+ if (!bit_size)
+ return llvm::createStringError(
+ "Unsupported type size in DW_OP_convert");
switch (encoding) {
case DW_ATE_signed:
case DW_ATE_signed_char:
@@ -2448,9 +2300,8 @@ bool DWARFExpression::Evaluate(
sign = false;
break;
default:
- if (error_ptr)
- error_ptr->SetErrorString("Unsupported encoding in DW_OP_convert");
- return false;
+ return llvm::createStringError(
+ "Unsupported encoding in DW_OP_convert");
}
}
Scalar &top = stack.back().ResolveValue(exe_ctx);
@@ -2472,15 +2323,15 @@ bool DWARFExpression::Evaluate(
if (cfa != LLDB_INVALID_ADDRESS) {
stack.push_back(Scalar(cfa));
stack.back().SetValueType(Value::ValueType::LoadAddress);
- } else if (error_ptr)
- error_ptr->SetErrorString("Stack frame does not include a canonical "
- "frame address for DW_OP_call_frame_cfa "
- "opcode.");
+ } else {
+ return llvm::createStringError(
+ "Stack frame does not include a canonical "
+ "frame address for DW_OP_call_frame_cfa "
+ "opcode.");
+ }
} else {
- if (error_ptr)
- error_ptr->SetErrorString("Invalid stack frame in context for "
- "DW_OP_call_frame_cfa opcode.");
- return false;
+ return llvm::createStringError("Invalid stack frame in context for "
+ "DW_OP_call_frame_cfa opcode.");
}
break;
@@ -2493,29 +2344,20 @@ bool DWARFExpression::Evaluate(
case DW_OP_form_tls_address:
case DW_OP_GNU_push_tls_address: {
if (stack.size() < 1) {
- if (error_ptr) {
- if (op == DW_OP_form_tls_address)
- error_ptr->SetErrorString(
- "DW_OP_form_tls_address needs an argument.");
- else
- error_ptr->SetErrorString(
- "DW_OP_GNU_push_tls_address needs an argument.");
- }
- return false;
+ if (op == DW_OP_form_tls_address)
+ return llvm::createStringError(
+ "DW_OP_form_tls_address needs an argument.");
+ else
+ return llvm::createStringError(
+ "DW_OP_GNU_push_tls_address needs an argument.");
}
- if (!exe_ctx || !module_sp) {
- if (error_ptr)
- error_ptr->SetErrorString("No context to evaluate TLS within.");
- return false;
- }
+ if (!exe_ctx || !module_sp)
+ return llvm::createStringError("No context to evaluate TLS within.");
Thread *thread = exe_ctx->GetThreadPtr();
- if (!thread) {
- if (error_ptr)
- error_ptr->SetErrorString("No thread to evaluate TLS within.");
- return false;
- }
+ if (!thread)
+ return llvm::createStringError("No thread to evaluate TLS within.");
// Lookup the TLS block address for this thread and module.
const addr_t tls_file_addr =
@@ -2523,12 +2365,9 @@ bool DWARFExpression::Evaluate(
const addr_t tls_load_addr =
thread->GetThreadLocalData(module_sp, tls_file_addr);
- if (tls_load_addr == LLDB_INVALID_ADDRESS) {
- if (error_ptr)
- error_ptr->SetErrorString(
- "No TLS data currently exists for this thread.");
- return false;
- }
+ if (tls_load_addr == LLDB_INVALID_ADDRESS)
+ return llvm::createStringError(
+ "No TLS data currently exists for this thread.");
stack.back().GetScalar() = tls_load_addr;
stack.back().SetValueType(Value::ValueType::LoadAddress);
@@ -2542,12 +2381,9 @@ bool DWARFExpression::Evaluate(
// and the 0 based index is the ULEB128 encoded index.
case DW_OP_addrx:
case DW_OP_GNU_addr_index: {
- if (!dwarf_cu) {
- if (error_ptr)
- error_ptr->SetErrorString("DW_OP_GNU_addr_index found without a "
- "compile unit being specified");
- return false;
- }
+ if (!dwarf_cu)
+ return llvm::createStringError("DW_OP_GNU_addr_index found without a "
+ "compile unit being specified");
uint64_t index = opcodes.GetULEB128(&offset);
lldb::addr_t value = dwarf_cu->ReadAddressFromDebugAddrSection(index);
stack.push_back(Scalar(value));
@@ -2570,10 +2406,8 @@ bool DWARFExpression::Evaluate(
// encoded index.
case DW_OP_GNU_const_index: {
if (!dwarf_cu) {
- if (error_ptr)
- error_ptr->SetErrorString("DW_OP_GNU_const_index found without a "
- "compile unit being specified");
- return false;
+ return llvm::createStringError("DW_OP_GNU_const_index found without a "
+ "compile unit being specified");
}
uint64_t index = opcodes.GetULEB128(&offset);
lldb::addr_t value = dwarf_cu->ReadAddressFromDebugAddrSection(index);
@@ -2582,12 +2416,9 @@ bool DWARFExpression::Evaluate(
case DW_OP_GNU_entry_value:
case DW_OP_entry_value: {
- if (!Evaluate_DW_OP_entry_value(stack, exe_ctx, reg_ctx, opcodes, offset,
- error_ptr, log)) {
- LLDB_ERRORF(error_ptr, "Could not evaluate %s.",
- DW_OP_value_to_name(op));
- return false;
- }
+ if (llvm::Error err = Evaluate_DW_OP_entry_value(stack, exe_ctx, reg_ctx,
+ opcodes, offset, log))
+ return err;
break;
}
@@ -2598,23 +2429,18 @@ bool DWARFExpression::Evaluate(
break;
}
}
- if (error_ptr)
- error_ptr->SetErrorStringWithFormatv(
- "Unhandled opcode {0} in DWARFExpression", LocationAtom(op));
- return false;
+ return llvm::createStringError(llvm::formatv(
+ "Unhandled opcode {0} in DWARFExpression", LocationAtom(op)));
}
}
if (stack.empty()) {
// Nothing on the stack, check if we created a piece value from DW_OP_piece
// or DW_OP_bit_piece opcodes
- if (pieces.GetBuffer().GetByteSize()) {
- result = pieces;
- return true;
- }
- if (error_ptr)
- error_ptr->SetErrorString("Stack empty after evaluation.");
- return false;
+ if (pieces.GetBuffer().GetByteSize())
+ return pieces;
+
+ return llvm::createStringError("Stack empty after evaluation.");
}
UpdateValueTypeFromLocationDescription(
@@ -2631,8 +2457,7 @@ bool DWARFExpression::Evaluate(
LLDB_LOGF(log, " %s", new_value.GetData());
}
}
- result = stack.back();
- return true; // Return true on success
+ return stack.back();
}
bool DWARFExpression::ParseDWARFLocationList(
diff --git a/lldb/source/Expression/DWARFExpressionList.cpp b/lldb/source/Expression/DWARFExpressionList.cpp
index cba4e4e5858ac..7a5cf9f9a0be4 100644
--- a/lldb/source/Expression/DWARFExpressionList.cpp
+++ b/lldb/source/Expression/DWARFExpressionList.cpp
@@ -198,12 +198,10 @@ void DWARFExpressionList::GetDescription(Stream *s,
}
}
-bool DWARFExpressionList::Evaluate(ExecutionContext *exe_ctx,
- RegisterContext *reg_ctx,
- lldb::addr_t func_load_addr,
- const Value *initial_value_ptr,
- const Value *object_address_ptr,
- Value &result, Status *error_ptr) const {
+llvm::Expected<Value> DWARFExpressionList::Evaluate(
+ ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
+ lldb::addr_t func_load_addr, const Value *initial_value_ptr,
+ const Value *object_address_ptr) const {
ModuleSP module_sp = m_module_wp.lock();
DataExtractor data;
RegisterKind reg_kind;
@@ -217,32 +215,26 @@ bool DWARFExpressionList::Evaluate(ExecutionContext *exe_ctx,
if (exe_ctx)
frame = exe_ctx->GetFramePtr();
if (!frame)
- return false;
+ return llvm::createStringError("no frame");
RegisterContextSP reg_ctx_sp = frame->GetRegisterContext();
if (!reg_ctx_sp)
- return false;
+ return llvm::createStringError("no register context");
reg_ctx_sp->GetPCForSymbolication(pc);
}
if (!pc.IsValid()) {
- if (error_ptr)
- error_ptr->SetErrorString("Invalid PC in frame.");
- return false;
+ return llvm::createStringError("Invalid PC in frame.");
}
addr_t pc_load_addr = pc.GetLoadAddress(exe_ctx->GetTargetPtr());
const DWARFExpression *entry =
GetExpressionAtAddress(func_load_addr, pc_load_addr);
- if (!entry) {
- if (error_ptr) {
- error_ptr->SetErrorString("variable not available");
- }
- return false;
- }
+ if (!entry)
+ return llvm::createStringError("variable not available");
expr = *entry;
}
expr.GetExpressionData(data);
reg_kind = expr.GetRegisterKind();
return DWARFExpression::Evaluate(exe_ctx, reg_ctx, module_sp, data,
m_dwarf_cu, reg_kind, initial_value_ptr,
- object_address_ptr, result, error_ptr);
+ object_address_ptr);
}
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
index dc4cfc96b86f0..f0e1e0560aa9a 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
@@ -572,6 +572,8 @@ TypeSP DWARFASTParserClang::ParseTypeFromDWARF(const SymbolContext &sc,
static std::optional<uint32_t>
ExtractDataMemberLocation(DWARFDIE const &die, DWARFFormValue const &form_value,
ModuleSP module_sp) {
+ Log *log = GetLog(DWARFLog::TypeCompletion | DWARFLog::Lookups);
+
// With DWARF 3 and later, if the value is an integer constant,
// this form value is the offset in bytes from the beginning of
// the containing entity.
@@ -579,21 +581,23 @@ ExtractDataMemberLocation(DWARFDIE const &die, DWARFFormValue const &form_value,
return form_value.Unsigned();
Value initialValue(0);
- Value memberOffset(0);
const DWARFDataExtractor &debug_info_data = die.GetData();
uint32_t block_length = form_value.Unsigned();
uint32_t block_offset =
form_value.BlockData() - debug_info_data.GetDataStart();
- if (!DWARFExpression::Evaluate(
- nullptr, // ExecutionContext *
- nullptr, // RegisterContext *
- module_sp, DataExtractor(debug_info_data, block_offset, block_length),
- die.GetCU(), eRegisterKindDWARF, &initialValue, nullptr, memberOffset,
- nullptr)) {
+
+ llvm::Expected<Value> memberOffset = DWARFExpression::Evaluate(
+ nullptr, // ExecutionContext *
+ nullptr, // RegisterContext *
+ module_sp, DataExtractor(debug_info_data, block_offset, block_length),
+ die.GetCU(), eRegisterKindDWARF, &initialValue, nullptr);
+ if (!memberOffset) {
+ LLDB_LOG_ERROR(log, memberOffset.takeError(),
+ "ExtractDataMemberLocation failed: {0}");
return {};
}
- return memberOffset.ResolveValue(nullptr).UInt();
+ return memberOffset->ResolveValue(nullptr).UInt();
}
static TypePayloadClang GetPtrAuthMofidierPayload(const DWARFDIE &die) {
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
index 661e4a78a0215..f4556925f5d68 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -2105,22 +2105,24 @@ SymbolFileDWARF::GlobalVariableMap &SymbolFileDWARF::GetGlobalAranges() {
if (var_sp && !var_sp->GetLocationIsConstantValueData()) {
const DWARFExpressionList &location =
var_sp->LocationExpressionList();
- Value location_result;
- Status error;
ExecutionContext exe_ctx;
- if (location.Evaluate(&exe_ctx, nullptr, LLDB_INVALID_ADDRESS,
- nullptr, nullptr, location_result,
- &error)) {
- if (location_result.GetValueType() ==
+ llvm::Expected<Value> location_result = location.Evaluate(
+ &exe_ctx, nullptr, LLDB_INVALID_ADDRESS, nullptr, nullptr);
+ if (location_result) {
+ if (location_result->GetValueType() ==
Value::ValueType::FileAddress) {
lldb::addr_t file_addr =
- location_result.GetScalar().ULongLong();
+ location_result->GetScalar().ULongLong();
lldb::addr_t byte_size = 1;
if (var_sp->GetType())
byte_size =
var_sp->GetType()->GetByteSize(nullptr).value_or(0);
m_global_aranges_up->Append(GlobalVariableMap::Entry(
file_addr, byte_size, var_sp.get()));
+ } else {
+ LLDB_LOG_ERROR(
+ GetLog(LLDBLog::Symbols), location_result.takeError(),
+ "location expression failed to execute: {0}");
}
}
}
diff --git a/lldb/source/Symbol/Function.cpp b/lldb/source/Symbol/Function.cpp
index 194f89bc51d80..96d8322b43d84 100644
--- a/lldb/source/Symbol/Function.cpp
+++ b/lldb/source/Symbol/Function.cpp
@@ -220,17 +220,18 @@ Function *IndirectCallEdge::GetCallee(ModuleList &images,
ExecutionContext &exe_ctx) {
Log *log = GetLog(LLDBLog::Step);
Status error;
- Value callee_addr_val;
- if (!call_target.Evaluate(
- &exe_ctx, exe_ctx.GetRegisterContext(), LLDB_INVALID_ADDRESS,
- /*initial_value_ptr=*/nullptr,
- /*object_address_ptr=*/nullptr, callee_addr_val, &error)) {
- LLDB_LOGF(log, "IndirectCallEdge: Could not evaluate expression: %s",
- error.AsCString());
+ llvm::Expected<Value> callee_addr_val = call_target.Evaluate(
+ &exe_ctx, exe_ctx.GetRegisterContext(), LLDB_INVALID_ADDRESS,
+ /*initial_value_ptr=*/nullptr,
+ /*object_address_ptr=*/nullptr);
+ if (!callee_addr_val) {
+ LLDB_LOG_ERROR(log, callee_addr_val.takeError(),
+ "IndirectCallEdge: Could not evaluate expression: {0}");
return nullptr;
}
- addr_t raw_addr = callee_addr_val.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
+ addr_t raw_addr =
+ callee_addr_val->GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
if (raw_addr == LLDB_INVALID_ADDRESS) {
LLDB_LOG(log, "IndirectCallEdge: Could not extract address from scalar");
return nullptr;
diff --git a/lldb/source/Target/RegisterContextUnwind.cpp b/lldb/source/Target/RegisterContextUnwind.cpp
index e2d712cb72eae..95e8abd763d53 100644
--- a/lldb/source/Target/RegisterContextUnwind.cpp
+++ b/lldb/source/Target/RegisterContextUnwind.cpp
@@ -1661,12 +1661,14 @@ RegisterContextUnwind::SavedLocationForRegister(
unwindplan_registerkind);
Value cfa_val = Scalar(m_cfa);
cfa_val.SetValueType(Value::ValueType::LoadAddress);
- Value result;
- Status error;
- if (dwarfexpr.Evaluate(&exe_ctx, this, 0, &cfa_val, nullptr, result,
- &error)) {
+ llvm::Expected<Value> result =
+ dwarfexpr.Evaluate(&exe_ctx, this, 0, &cfa_val, nullptr);
+ if (!result) {
+ LLDB_LOG_ERROR(log, result.takeError(),
+ "DWARF expression failed to evaluate: {0}");
+ } else {
addr_t val;
- val = result.GetScalar().ULongLong();
+ val = result->GetScalar().ULongLong();
if (unwindplan_regloc.IsDWARFExpression()) {
regloc.type = UnwindLLDB::RegisterLocation::eRegisterValueInferred;
regloc.location.inferred_value = val;
@@ -2029,11 +2031,10 @@ bool RegisterContextUnwind::ReadFrameAddress(
DWARFExpressionList dwarfexpr(opcode_ctx, dwarfdata, nullptr);
dwarfexpr.GetMutableExpressionAtAddress()->SetRegisterKind(
row_register_kind);
- Value result;
- Status error;
- if (dwarfexpr.Evaluate(&exe_ctx, this, 0, nullptr, nullptr, result,
- &error)) {
- address = result.GetScalar().ULongLong();
+ llvm::Expected<Value> result =
+ dwarfexpr.Evaluate(&exe_ctx, this, 0, nullptr, nullptr);
+ if (result) {
+ address = result->GetScalar().ULongLong();
if (ABISP abi_sp = m_thread.GetProcess()->GetABI())
address = abi_sp->FixCodeAddress(address);
@@ -2042,7 +2043,7 @@ bool RegisterContextUnwind::ReadFrameAddress(
return true;
}
UnwindLogMsg("Failed to set CFA value via DWARF expression: %s",
- error.AsCString());
+ llvm::toString(result.takeError()).c_str());
break;
}
case UnwindPlan::Row::FAValue::isRaSearch: {
diff --git a/lldb/source/Target/StackFrame.cpp b/lldb/source/Target/StackFrame.cpp
index 246871d5abaa5..3a2b4d05b2881 100644
--- a/lldb/source/Target/StackFrame.cpp
+++ b/lldb/source/Target/StackFrame.cpp
@@ -1091,24 +1091,19 @@ bool StackFrame::GetFrameBaseValue(Scalar &frame_base, Status *error_ptr) {
m_flags.Set(GOT_FRAME_BASE);
ExecutionContext exe_ctx(shared_from_this());
- Value expr_value;
addr_t loclist_base_addr = LLDB_INVALID_ADDRESS;
if (!m_sc.function->GetFrameBaseExpression().IsAlwaysValidSingleExpr())
loclist_base_addr =
m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress(
exe_ctx.GetTargetPtr());
- if (!m_sc.function->GetFrameBaseExpression().Evaluate(
- &exe_ctx, nullptr, loclist_base_addr, nullptr, nullptr,
- expr_value, &m_frame_base_error)) {
- // We should really have an error if evaluate returns, but in case we
- // don't, lets set the error to something at least.
- if (m_frame_base_error.Success())
- m_frame_base_error.SetErrorString(
- "Evaluation of the frame base expression failed.");
- } else {
- m_frame_base = expr_value.ResolveValue(&exe_ctx);
- }
+ llvm::Expected<Value> expr_value =
+ m_sc.function->GetFrameBaseExpression().Evaluate(
+ &exe_ctx, nullptr, loclist_base_addr, nullptr, nullptr);
+ if (!expr_value)
+ m_frame_base_error = expr_value.takeError();
+ else
+ m_frame_base = expr_value->ResolveValue(&exe_ctx);
} else {
m_frame_base_error.SetErrorString("No function in symbol context.");
}
diff --git a/lldb/unittests/Expression/DWARFExpressionTest.cpp b/lldb/unittests/Expression/DWARFExpressionTest.cpp
index 602bd19ceecf8..f9e0605fce29d 100644
--- a/lldb/unittests/Expression/DWARFExpressionTest.cpp
+++ b/lldb/unittests/Expression/DWARFExpressionTest.cpp
@@ -33,23 +33,23 @@ static llvm::Expected<Scalar> Evaluate(llvm::ArrayRef<uint8_t> expr,
ExecutionContext *exe_ctx = nullptr) {
DataExtractor extractor(expr.data(), expr.size(), lldb::eByteOrderLittle,
/*addr_size*/ 4);
- Value result;
- Status status;
- if (!DWARFExpression::Evaluate(exe_ctx, /*reg_ctx*/ nullptr, module_sp,
- extractor, unit, lldb::eRegisterKindLLDB,
- /*initial_value_ptr*/ nullptr,
- /*object_address_ptr*/ nullptr, result,
- &status))
- return status.ToError();
-
- switch (result.GetValueType()) {
+
+ llvm::Expected<Value> result =
+ DWARFExpression::Evaluate(exe_ctx, /*reg_ctx*/ nullptr, module_sp,
+ extractor, unit, lldb::eRegisterKindLLDB,
+ /*initial_value_ptr*/ nullptr,
+ /*object_address_ptr*/ nullptr);
+ if (!result)
+ return result.takeError();
+
+ switch (result->GetValueType()) {
case Value::ValueType::Scalar:
- return result.GetScalar();
+ return result->GetScalar();
case Value::ValueType::LoadAddress:
return LLDB_INVALID_ADDRESS;
case Value::ValueType::HostAddress: {
// Convert small buffers to scalars to simplify the tests.
- DataBufferHeap &buf = result.GetBuffer();
+ DataBufferHeap &buf = result->GetBuffer();
if (buf.GetByteSize() <= 8) {
uint64_t val = 0;
memcpy(&val, buf.GetBytes(), buf.GetByteSize());
@@ -58,8 +58,9 @@ static llvm::Expected<Scalar> Evaluate(llvm::ArrayRef<uint8_t> expr,
}
[[fallthrough]];
default:
- return status.ToError();
+ break;
}
+ return llvm::createStringError("unsupported value type");
}
class DWARFExpressionTester : public YAMLModuleTester {
@@ -454,16 +455,15 @@ TEST_F(DWARFExpressionMockProcessTest, WASM_DW_OP_addr) {
uint8_t expr[] = {DW_OP_addr, 0x40, 0x0, 0x0, 0x0};
DataExtractor extractor(expr, sizeof(expr), lldb::eByteOrderLittle,
/*addr_size*/ 4);
- Value result;
- Status status;
- ASSERT_TRUE(DWARFExpression::Evaluate(
+
+ llvm::Expected<Value> result = DWARFExpression::Evaluate(
&exe_ctx, /*reg_ctx*/ nullptr, /*module_sp*/ {}, extractor,
/*unit*/ nullptr, lldb::eRegisterKindLLDB,
/*initial_value_ptr*/ nullptr,
- /*object_address_ptr*/ nullptr, result, &status))
- << status.ToError();
+ /*object_address_ptr*/ nullptr);
- ASSERT_EQ(result.GetValueType(), Value::ValueType::LoadAddress);
+ ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
+ ASSERT_EQ(result->GetValueType(), Value::ValueType::LoadAddress);
}
TEST_F(DWARFExpressionMockProcessTest, WASM_DW_OP_addr_index) {
@@ -530,14 +530,14 @@ TEST_F(DWARFExpressionMockProcessTest, WASM_DW_OP_addr_index) {
ExecutionContext exe_ctx(target_sp, false);
- auto evaluate = [&](DWARFExpression &expr, Status &status, Value &result) {
+ auto evaluate = [&](DWARFExpression &expr) -> llvm::Expected<Value> {
DataExtractor extractor;
expr.GetExpressionData(extractor);
- return DWARFExpression::Evaluate(
- &exe_ctx, /*reg_ctx*/ nullptr, /*module_sp*/ {}, extractor, dwarf_cu,
- lldb::eRegisterKindLLDB,
- /*initial_value_ptr*/ nullptr,
- /*object_address_ptr*/ nullptr, result, &status);
+ return DWARFExpression::Evaluate(&exe_ctx, /*reg_ctx*/ nullptr,
+ /*module_sp*/ {}, extractor, dwarf_cu,
+ lldb::eRegisterKindLLDB,
+ /*initial_value_ptr*/ nullptr,
+ /*object_address_ptr*/ nullptr);
};
// DW_OP_addrx takes a single leb128 operand, the index in the addr table:
@@ -546,16 +546,16 @@ TEST_F(DWARFExpressionMockProcessTest, WASM_DW_OP_addr_index) {
/*addr_size*/ 4);
DWARFExpression expr(extractor);
- Status status;
- Value result;
- ASSERT_TRUE(evaluate(expr, status, result)) << status.ToError();
- ASSERT_EQ(result.GetValueType(), Value::ValueType::LoadAddress);
- ASSERT_EQ(result.GetScalar().UInt(), 0x5678u);
+ llvm::Expected<Value> result = evaluate(expr);
+ ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
+ ASSERT_EQ(result->GetValueType(), Value::ValueType::LoadAddress);
+ ASSERT_EQ(result->GetScalar().UInt(), 0x5678u);
ASSERT_TRUE(expr.Update_DW_OP_addr(dwarf_cu, 0xdeadbeef));
- ASSERT_TRUE(evaluate(expr, status, result)) << status.ToError();
- ASSERT_EQ(result.GetValueType(), Value::ValueType::LoadAddress);
- ASSERT_EQ(result.GetScalar().UInt(), 0xdeadbeefu);
+ result = evaluate(expr);
+ ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
+ ASSERT_EQ(result->GetValueType(), Value::ValueType::LoadAddress);
+ ASSERT_EQ(result->GetScalar().UInt(), 0xdeadbeefu);
}
class CustomSymbolFileDWARF : public SymbolFileDWARF {
@@ -825,15 +825,13 @@ TEST_F(DWARFExpressionMockProcessTest, DW_OP_piece_file_addr) {
DW_OP_addr, 0x50, 0x0, 0x0, 0x0, DW_OP_piece, 1};
DataExtractor extractor(expr, sizeof(expr), lldb::eByteOrderLittle,
/*addr_size*/ 4);
- Value result;
- Status status;
- ASSERT_TRUE(DWARFExpression::Evaluate(
+ llvm::Expected<Value> result = DWARFExpression::Evaluate(
&exe_ctx, /*reg_ctx*/ nullptr, /*module_sp*/ {}, extractor,
/*unit*/ nullptr, lldb::eRegisterKindLLDB,
/*initial_value_ptr*/ nullptr,
- /*object_address_ptr*/ nullptr, result, &status))
- << status.ToError();
+ /*object_address_ptr*/ nullptr);
- ASSERT_EQ(result.GetValueType(), Value::ValueType::HostAddress);
- ASSERT_THAT(result.GetBuffer().GetData(), ElementsAre(0x11, 0x22));
+ ASSERT_THAT_EXPECTED(result, llvm::Succeeded());
+ ASSERT_EQ(result->GetValueType(), Value::ValueType::HostAddress);
+ ASSERT_THAT(result->GetBuffer().GetData(), ElementsAre(0x11, 0x22));
}
>From b6e28ab5747c277429fb17dafc331bd87d34569b Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas at devlieghere.com>
Date: Tue, 4 Jun 2024 19:28:40 -0700
Subject: [PATCH 3/4] [lldb] Move LLDB_LOG_ERROR to correct else block
---
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
index f4556925f5d68..af3ba2cd5b39d 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -2119,11 +2119,11 @@ SymbolFileDWARF::GlobalVariableMap &SymbolFileDWARF::GetGlobalAranges() {
var_sp->GetType()->GetByteSize(nullptr).value_or(0);
m_global_aranges_up->Append(GlobalVariableMap::Entry(
file_addr, byte_size, var_sp.get()));
- } else {
- LLDB_LOG_ERROR(
- GetLog(LLDBLog::Symbols), location_result.takeError(),
- "location expression failed to execute: {0}");
}
+ } else {
+ LLDB_LOG_ERROR(GetLog(LLDBLog::Symbols),
+ location_result.takeError(),
+ "location expression failed to execute: {0}");
}
}
}
>From aa51bea351e0fdcf1626ca545fa8c4523d9b5f8a Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas at devlieghere.com>
Date: Tue, 4 Jun 2024 19:48:26 -0700
Subject: [PATCH 4/4] [lldb] Improve DW_OP_entry_value error reporting
---
lldb/source/Expression/DWARFExpression.cpp | 44 +++++++------------
.../basic_entry_values/main.cpp | 7 +--
2 files changed, 21 insertions(+), 30 deletions(-)
diff --git a/lldb/source/Expression/DWARFExpression.cpp b/lldb/source/Expression/DWARFExpression.cpp
index 5c7ab49410efe..80d03c84fadbd 100644
--- a/lldb/source/Expression/DWARFExpression.cpp
+++ b/lldb/source/Expression/DWARFExpression.cpp
@@ -593,15 +593,13 @@ static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
// 1. Find the function which pushed the current frame onto the stack.
if ((!exe_ctx || !exe_ctx->HasTargetScope()) || !reg_ctx) {
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: no exe/reg context");
+ return llvm::createStringError("no exe/reg context");
}
StackFrame *current_frame = exe_ctx->GetFramePtr();
Thread *thread = exe_ctx->GetThreadPtr();
if (!current_frame || !thread)
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: no current frame/thread");
+ return llvm::createStringError("no current frame/thread");
Target &target = exe_ctx->GetTargetRef();
StackFrameSP parent_frame = nullptr;
@@ -619,9 +617,7 @@ static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
// parent frame.
if (return_pc == LLDB_INVALID_ADDRESS) {
return_pc = parent_frame->GetFrameCodeAddress().GetLoadAddress(&target);
- LLDB_LOG(log,
- "Evaluate_DW_OP_entry_value: immediate ancestor with pc = {0:x}",
- return_pc);
+ LLDB_LOG(log, "immediate ancestor with pc = {0:x}", return_pc);
}
// If we've found an inlined frame, skip it (these have no call site
@@ -633,23 +629,20 @@ static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
break;
}
if (!parent_frame || !parent_frame->GetRegisterContext()) {
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: no parent frame with reg ctx");
+ return llvm::createStringError("no parent frame with reg ctx");
}
Function *parent_func =
parent_frame->GetSymbolContext(eSymbolContextFunction).function;
if (!parent_func)
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: no parent function");
+ return llvm::createStringError("no parent function");
// 2. Find the call edge in the parent function responsible for creating the
// current activation.
Function *current_func =
current_frame->GetSymbolContext(eSymbolContextFunction).function;
if (!current_func)
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: no current function");
+ return llvm::createStringError("no current function");
CallEdge *call_edge = nullptr;
ModuleList &modlist = target.GetImages();
@@ -660,16 +653,14 @@ static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
// produced by an ambiguous tail call. In this case, refuse to proceed.
call_edge = parent_func->GetCallEdgeForReturnAddress(return_pc, target);
if (!call_edge) {
- return llvm::createStringError(llvm::formatv(
- "Evaluate_DW_OP_entry_value: no call edge for retn-pc = {0:x} "
- "in parent frame {1}",
- return_pc, parent_func->GetName()));
+ return llvm::createStringError(
+ llvm::formatv("no call edge for retn-pc = {0:x} in parent frame {1}",
+ return_pc, parent_func->GetName()));
}
Function *callee_func = call_edge->GetCallee(modlist, parent_exe_ctx);
if (callee_func != current_func) {
return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: ambiguous call sequence, "
- "can't find real parent frame");
+ "ambiguous call sequence, can't find real parent frame");
}
} else {
// The StackFrameList solver machinery has deduced that an unambiguous tail
@@ -683,9 +674,8 @@ static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
}
}
if (!call_edge)
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: no unambiguous edge from parent "
- "to current function");
+ return llvm::createStringError("no unambiguous edge from parent "
+ "to current function");
// 3. Attempt to locate the DW_OP_entry_value expression in the set of
// available call site parameters. If found, evaluate the corresponding
@@ -693,8 +683,7 @@ static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
const uint32_t subexpr_len = opcodes.GetULEB128(&opcode_offset);
const void *subexpr_data = opcodes.GetData(&opcode_offset, subexpr_len);
if (!subexpr_data)
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: subexpr could not be read");
+ return llvm::createStringError("subexpr could not be read");
const CallSiteParameter *matched_param = nullptr;
for (const CallSiteParameter ¶m : call_edge->GetCallSiteParameters()) {
@@ -721,8 +710,7 @@ static llvm::Error Evaluate_DW_OP_entry_value(std::vector<Value> &stack,
}
}
if (!matched_param)
- return llvm::createStringError(
- "Evaluate_DW_OP_entry_value: no matching call site param found");
+ return llvm::createStringError("no matching call site param found");
// TODO: Add support for DW_OP_push_object_address within a DW_OP_entry_value
// subexpresion whenever llvm does.
@@ -2418,7 +2406,9 @@ llvm::Expected<Value> DWARFExpression::Evaluate(
case DW_OP_entry_value: {
if (llvm::Error err = Evaluate_DW_OP_entry_value(stack, exe_ctx, reg_ctx,
opcodes, offset, log))
- return err;
+ return llvm::createStringError(
+ "could not evaluate DW_OP_entry_value: %s",
+ llvm::toString(std::move(err)).c_str());
break;
}
diff --git a/lldb/test/API/functionalities/param_entry_vals/basic_entry_values/main.cpp b/lldb/test/API/functionalities/param_entry_vals/basic_entry_values/main.cpp
index 91769e8768017..2b28d0357e0cc 100644
--- a/lldb/test/API/functionalities/param_entry_vals/basic_entry_values/main.cpp
+++ b/lldb/test/API/functionalities/param_entry_vals/basic_entry_values/main.cpp
@@ -52,9 +52,10 @@ __attribute__((noinline)) void func4_amb(int &sink, int x) {
//% expect_cmd_failure=True)
//% self.filecheck("expr sink", "main.cpp","-check-prefix=FUNC4-EXPR",
//% expect_cmd_failure=True)
- // FUNC4-EXPR-FAIL: couldn't get the value of variable x: Could not evaluate
- // DW_OP_entry_value. FUNC4-EXPR: couldn't get the value of variable sink:
- // Could not evaluate DW_OP_entry_value.
+ // FUNC4-EXPR-FAIL: couldn't get the value of variable x: could not evaluate
+ // DW_OP_entry_value: no matching call site param found FUNC4-EXPR: couldn't
+ // get the value of variable sink: could not evaluate DW_OP_entry_value: no
+ // matching call site param found
}
__attribute__((noinline)) void func5_amb() {}
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