caio/clang-p2996
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[lldb] Introduce StackFrameRecognizer [take 2]

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This patch introduces a concept of "frame recognizer" and "recognized frame". This should be an extensible mechanism that retrieves information about special frames based on ABI, arguments or other special properties of that frame, even without source code. A few examples where that could be useful could be 1) objc_exception_throw, where we'd like to get the current exception, 2) terminate_with_reason and extracting the current terminate string, 3) recognizing Objective-C frames and automatically extracting the receiver+selector, or perhaps all arguments (based on selector).

Differential Revision: https://reviews.llvm.org/D44603

llvm-svn: 345686
This commit is contained in:
Kuba Mracek
2018-10-31 00:36:20 +00:00
parent 3e27306565
commit 8fddd98185
24 changed files with 1162 additions and 16 deletions
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25
lldb/source/API/SBFrame.cpp
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@@ -36,6 +36,7 @@
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/StackFrameRecognizer.h"
#include "lldb/Target/StackID.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
@@ -960,6 +961,7 @@ SBValueList SBFrame::GetVariables(const lldb::SBVariablesOptions &options) {
const bool statics = options.GetIncludeStatics();
const bool arguments = options.GetIncludeArguments();
const bool recognized_arguments = options.GetIncludeRecognizedArguments();
const bool locals = options.GetIncludeLocals();
const bool in_scope_only = options.GetInScopeOnly();
const bool include_runtime_support_values =
@@ -967,10 +969,11 @@ SBValueList SBFrame::GetVariables(const lldb::SBVariablesOptions &options) {
const lldb::DynamicValueType use_dynamic = options.GetUseDynamic();
if (log)
log->Printf("SBFrame::GetVariables (arguments=%i, locals=%i, statics=%i, "
"in_scope_only=%i runtime=%i dynamic=%i)",
arguments, locals, statics, in_scope_only,
include_runtime_support_values, use_dynamic);
log->Printf(
"SBFrame::GetVariables (arguments=%i, recognized_arguments=%i, "
"locals=%i, statics=%i, in_scope_only=%i runtime=%i dynamic=%i)",
arguments, recognized_arguments, locals, statics, in_scope_only,
include_runtime_support_values, use_dynamic);
std::set<VariableSP> variable_set;
Process *process = exe_ctx.GetProcessPtr();
@@ -1032,6 +1035,20 @@ SBValueList SBFrame::GetVariables(const lldb::SBVariablesOptions &options) {
}
}
}
if (recognized_arguments) {
auto recognized_frame = frame->GetRecognizedFrame();
if (recognized_frame) {
ValueObjectListSP recognized_arg_list =
recognized_frame->GetRecognizedArguments();
if (recognized_arg_list) {
for (auto &rec_value_sp : recognized_arg_list->GetObjects()) {
SBValue value_sb;
value_sb.SetSP(rec_value_sp, use_dynamic);
value_list.Append(value_sb);
}
}
}
}
} else {
if (log)
log->Printf("SBFrame::GetVariables () => error: could not "