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wavm: emit stack trace when an exception happens #84

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Merged
merged 3 commits into from
Oct 29, 2020
Merged

wavm: emit stack trace when an exception happens #84

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5281426
wavm: emit stack trace
mathetake Oct 28, 2020
da4c2ef
review: tidy up stacktrace message
mathetake Oct 29, 2020
8100795
align trailing spaces
mathetake Oct 29, 2020
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32 changes: 28 additions & 4 deletions src/wavm/wavm.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -17,10 +17,12 @@
#include "include/proxy-wasm/wasm_vm.h"

#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <map>
#include <memory>
#include <optional>
#include <sstream>
#include <unordered_map>
#include <utility>
#include <vector>
Expand All @@ -42,6 +44,7 @@
#include "WAVM/Runtime/Intrinsics.h"
#include "WAVM/Runtime/Linker.h"
#include "WAVM/Runtime/Runtime.h"
#include "WAVM/RuntimeABI/RuntimeABI.h"
#include "WAVM/WASM/WASM.h"
#include "WAVM/WASTParse/WASTParse.h"

Expand Down Expand Up @@ -90,16 +93,37 @@ namespace {
WAVM::Runtime::catchRuntimeExceptions( \
[&] { _x; }, \
[&](WAVM::Runtime::Exception *exception) { \
auto description = describeException(exception); \
_wavm->fail(FailState::RuntimeError, \
"Function: " + std::string(function_name) + " failed: " + description); \
destroyException(exception); \
_wavm->fail(FailState::RuntimeError, getFailMessage(function_name, exception)); \
throw std::exception(); \
}); \
} catch (...) { \
} \
} while (0)

std::string getFailMessage(std::string_view function_name, WAVM::Runtime::Exception *exception) {
std::string message = "Function " + std::string(function_name) +
" failed: " + WAVM::Runtime::describeExceptionType(exception->type) +
"\nProxy-Wasm plugin in-VM backtrace:\n";
std::vector<std::string> callstack_descriptions =
WAVM::Runtime::describeCallStack(exception->callStack);

// Since the first frame is on host and useless for developers, e.g.: `host!envoy+112901013`
// we start with index 1 here
for (size_t i = 1; i < callstack_descriptions.size(); i++) {
std::ostringstream oss;
std::string description = callstack_descriptions[i];
if (description.find("wasm!") == std::string::npos) {
// end of WASM's call stack
break;
}
oss << std::setw(3) << std::setfill(' ') << std::to_string(i);
message += oss.str() + ": " + description + "\n";
}

WAVM::Runtime::destroyException(exception);
return message;
}

struct WasmUntaggedValue : public WAVM::IR::UntaggedValue {
WasmUntaggedValue() = default;
WasmUntaggedValue(I32 inI32) { i32 = inI32; }
Expand Down