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//===-- StackTraceRequestHandler.cpp --------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DAP.h"
#include "EventHelper.h"
#include "JSONUtils.h"
#include "RequestHandler.h"
namespace lldb_dap {
/// Page size used for reporting addtional frames in the 'stackTrace' request.
static constexpr int StackPageSize = 20;
// Fill in the stack frames of the thread.
//
// Threads stacks may contain runtime specific extended backtraces, when
// constructing a stack trace first report the full thread stack trace then
// perform a breadth first traversal of any extended backtrace frames.
//
// For example:
//
// Thread (id=th0) stack=[s0, s1, s2, s3]
// \ Extended backtrace "libdispatch" Thread (id=th1) stack=[s0, s1]
// \ Extended backtrace "libdispatch" Thread (id=th2) stack=[s0, s1]
// \ Extended backtrace "Application Specific Backtrace" Thread (id=th3)
// stack=[s0, s1, s2]
//
// Which will flatten into:
//
// 0. th0->s0
// 1. th0->s1
// 2. th0->s2
// 3. th0->s3
// 4. label - Enqueued from th1, sf=-1, i=-4
// 5. th1->s0
// 6. th1->s1
// 7. label - Enqueued from th2
// 8. th2->s0
// 9. th2->s1
// 10. label - Application Specific Backtrace
// 11. th3->s0
// 12. th3->s1
// 13. th3->s2
//
// s=3,l=3 = [th0->s3, label1, th1->s0]
static bool FillStackFrames(DAP &dap, lldb::SBThread &thread,
lldb::SBFormat &frame_format,
llvm::json::Array &stack_frames, int64_t &offset,
const int64_t start_frame, const int64_t levels,
const bool include_all) {
bool reached_end_of_stack = false;
for (int64_t i = start_frame;
static_cast<int64_t>(stack_frames.size()) < levels; i++) {
if (i == -1) {
stack_frames.emplace_back(
CreateExtendedStackFrameLabel(thread, frame_format));
continue;
}
lldb::SBFrame frame = thread.GetFrameAtIndex(i);
if (!frame.IsValid()) {
offset += thread.GetNumFrames() + 1 /* label between threads */;
reached_end_of_stack = true;
break;
}
stack_frames.emplace_back(CreateStackFrame(dap, frame, frame_format));
}
if (include_all && reached_end_of_stack) {
// Check for any extended backtraces.
for (uint32_t bt = 0;
bt < thread.GetProcess().GetNumExtendedBacktraceTypes(); bt++) {
lldb::SBThread backtrace = thread.GetExtendedBacktraceThread(
thread.GetProcess().GetExtendedBacktraceTypeAtIndex(bt));
if (!backtrace.IsValid())
continue;
reached_end_of_stack = FillStackFrames(
dap, backtrace, frame_format, stack_frames, offset,
(start_frame - offset) > 0 ? start_frame - offset : -1, levels,
include_all);
if (static_cast<int64_t>(stack_frames.size()) >= levels)
break;
}
}
return reached_end_of_stack;
}
// "StackTraceRequest": {
// "allOf": [ { "$ref": "#/definitions/Request" }, {
// "type": "object",
// "description": "StackTrace request; value of command field is
// 'stackTrace'. The request returns a stacktrace from the current execution
// state.", "properties": {
// "command": {
// "type": "string",
// "enum": [ "stackTrace" ]
// },
// "arguments": {
// "$ref": "#/definitions/StackTraceArguments"
// }
// },
// "required": [ "command", "arguments" ]
// }]
// },
// "StackTraceArguments": {
// "type": "object",
// "description": "Arguments for 'stackTrace' request.",
// "properties": {
// "threadId": {
// "type": "integer",
// "description": "Retrieve the stacktrace for this thread."
// },
// "startFrame": {
// "type": "integer",
// "description": "The index of the first frame to return; if omitted
// frames start at 0."
// },
// "levels": {
// "type": "integer",
// "description": "The maximum number of frames to return. If levels is
// not specified or 0, all frames are returned."
// },
// "format": {
// "$ref": "#/definitions/StackFrameFormat",
// "description": "Specifies details on how to format the stack frames.
// The attribute is only honored by a debug adapter if the corresponding
// capability `supportsValueFormattingOptions` is true."
// }
// },
// "required": [ "threadId" ]
// },
// "StackTraceResponse": {
// "allOf": [ { "$ref": "#/definitions/Response" }, {
// "type": "object",
// "description": "Response to `stackTrace` request.",
// "properties": {
// "body": {
// "type": "object",
// "properties": {
// "stackFrames": {
// "type": "array",
// "items": {
// "$ref": "#/definitions/StackFrame"
// },
// "description": "The frames of the stackframe. If the array has
// length zero, there are no stackframes available. This means that
// there is no location information available."
// },
// "totalFrames": {
// "type": "integer",
// "description": "The total number of frames available in the
// stack. If omitted or if `totalFrames` is larger than the
// available frames, a client is expected to request frames until
// a request returns less frames than requested (which indicates
// the end of the stack). Returning monotonically increasing
// `totalFrames` values for subsequent requests can be used to
// enforce paging in the client."
// }
// },
// "required": [ "stackFrames" ]
// }
// },
// "required": [ "body" ]
// }]
// }
void StackTraceRequestHandler::operator()(
const llvm::json::Object &request) const {
llvm::json::Object response;
FillResponse(request, response);
lldb::SBError error;
const auto *arguments = request.getObject("arguments");
lldb::SBThread thread = dap.GetLLDBThread(*arguments);
llvm::json::Array stack_frames;
llvm::json::Object body;
lldb::SBFormat frame_format = dap.frame_format;
bool include_all = dap.configuration.displayExtendedBacktrace;
if (const auto *format = arguments->getObject("format")) {
// Indicates that all stack frames should be included, even those the debug
// adapter might otherwise hide.
include_all = GetBoolean(format, "includeAll").value_or(false);
// Parse the properties that have a corresponding format string.
// FIXME: Support "parameterTypes" and "hex".
const bool module = GetBoolean(format, "module").value_or(false);
const bool line = GetBoolean(format, "line").value_or(false);
const bool parameters = GetBoolean(format, "parameters").value_or(false);
const bool parameter_names =
GetBoolean(format, "parameterNames").value_or(false);
const bool parameter_values =
GetBoolean(format, "parameterValues").value_or(false);
// Only change the format string if we have to.
if (module || line || parameters || parameter_names || parameter_values) {
std::string format_str;
llvm::raw_string_ostream os(format_str);
if (module)
os << "{${module.file.basename} }";
if (line)
os << "{${line.file.basename}:${line.number}:${line.column} }";
if (parameters || parameter_names || parameter_values)
os << "{${function.name-with-args}}";
else
os << "{${function.name-without-args}}";
lldb::SBError error;
frame_format = lldb::SBFormat(format_str.c_str(), error);
assert(error.Success());
}
}
if (thread.IsValid()) {
const auto start_frame =
GetInteger<uint64_t>(arguments, "startFrame").value_or(0);
const auto levels = GetInteger<uint64_t>(arguments, "levels").value_or(0);
int64_t offset = 0;
bool reached_end_of_stack = FillStackFrames(
dap, thread, frame_format, stack_frames, offset, start_frame,
levels == 0 ? INT64_MAX : levels, include_all);
body.try_emplace("totalFrames",
start_frame + stack_frames.size() +
(reached_end_of_stack ? 0 : StackPageSize));
}
body.try_emplace("stackFrames", std::move(stack_frames));
response.try_emplace("body", std::move(body));
dap.SendJSON(llvm::json::Value(std::move(response)));
}
} // namespace lldb_dap
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