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v8/test/cctest/wasm/test-wasm-stack.cc
Clemens Hammacher 4254af197b [wasm] Use right data type for storing error location 
Use int instead of byte to store the source position when computing a
location based on the stack trace stored in an error object.
Also add tests, since this code path was not covered before (not even
for small position where it would have succeeded).
Also, add some comments about which positions are 0-based and 1-based.

R=titzer@chromium.org

Change-Id: I313dcd6c47b77093ced9bb687415715d04eafb97
Reviewed-on: https://chromium-review.googlesource.com/645527
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47739}
2017-08-31 11:07:25 +00:00

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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/assembler-inl.h"
#include "test/cctest/cctest.h"
#include "test/cctest/compiler/value-helper.h"
#include "test/cctest/wasm/wasm-run-utils.h"
#include "test/common/wasm/test-signatures.h"
#include "test/common/wasm/wasm-macro-gen.h"
using namespace v8::base;
using namespace v8::internal;
using namespace v8::internal::compiler;
using namespace v8::internal::wasm;
using v8::Local;
using v8::Utils;
namespace {
#define CHECK_CSTREQ(exp, found) \
do { \
const char* exp_ = (exp); \
const char* found_ = (found); \
DCHECK_NOT_NULL(exp); \
if (V8_UNLIKELY(found_ == nullptr || strcmp(exp_, found_) != 0)) { \
V8_Fatal(__FILE__, __LINE__, \
"Check failed: (%s) != (%s) ('%s' vs '%s').", #exp, #found, \
exp_, found_ ? found_ : "<null>"); \
} \
} while (0)
void PrintStackTrace(v8::Isolate* isolate, v8::Local<v8::StackTrace> stack) {
printf("Stack Trace (length %d):\n", stack->GetFrameCount());
for (int i = 0, e = stack->GetFrameCount(); i != e; ++i) {
v8::Local<v8::StackFrame> frame = stack->GetFrame(i);
v8::Local<v8::String> script = frame->GetScriptName();
v8::Local<v8::String> func = frame->GetFunctionName();
printf(
"[%d] (%s) %s:%d:%d\n", i,
script.IsEmpty() ? "<null>" : *v8::String::Utf8Value(isolate, script),
func.IsEmpty() ? "<null>" : *v8::String::Utf8Value(isolate, func),
frame->GetLineNumber(), frame->GetColumn());
}
}
struct ExceptionInfo {
const char* func_name;
int line_nr; // 1-based
int column; // 1-based
};
template <int N>
void CheckExceptionInfos(v8::internal::Isolate* i_isolate, Handle<Object> exc,
const ExceptionInfo (&excInfos)[N]) {
// Check that it's indeed an Error object.
CHECK(exc->IsJSError());
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(i_isolate);
// Extract stack frame from the exception.
Local<v8::Value> localExc = Utils::ToLocal(exc);
v8::Local<v8::StackTrace> stack = v8::Exception::GetStackTrace(localExc);
PrintStackTrace(v8_isolate, stack);
CHECK(!stack.IsEmpty());
CHECK_EQ(N, stack->GetFrameCount());
for (int frameNr = 0; frameNr < N; ++frameNr) {
v8::Local<v8::StackFrame> frame = stack->GetFrame(frameNr);
v8::String::Utf8Value funName(v8_isolate, frame->GetFunctionName());
CHECK_CSTREQ(excInfos[frameNr].func_name, *funName);
// Line and column are 1-based in v8::StackFrame, just as in ExceptionInfo.
CHECK_EQ(excInfos[frameNr].line_nr, frame->GetLineNumber());
CHECK_EQ(excInfos[frameNr].column, frame->GetColumn());
}
CheckComputeLocation(i_isolate, exc, excInfos[0]);
}
void CheckComputeLocation(v8::internal::Isolate* i_isolate, Handle<Object> exc,
const ExceptionInfo& topLocation) {
MessageLocation loc;
CHECK(i_isolate->ComputeLocationFromStackTrace(&loc, exc));
printf("loc start: %d, end: %d\n", loc.start_pos(), loc.end_pos());
Handle<JSMessageObject> message = i_isolate->CreateMessage(exc, nullptr);
printf("msg start: %d, end: %d, line: %d, col: %d\n",
message->start_position(), message->end_position(),
message->GetLineNumber(), message->GetColumnNumber());
CHECK_EQ(loc.start_pos(), message->start_position());
CHECK_EQ(loc.end_pos(), message->end_position());
// In the message, the line is 1-based, but the column is 0-based.
CHECK_EQ(topLocation.line_nr, message->GetLineNumber());
CHECK_LE(1, topLocation.column);
CHECK_EQ(topLocation.column - 1, message->GetColumnNumber());
}
} // namespace
// Call from JS to wasm to JS and throw an Error from JS.
TEST(CollectDetailedWasmStack_ExplicitThrowFromJs) {
WasmRunner<void> r(kExecuteCompiled);
TestSignatures sigs;
uint32_t js_throwing_index = r.builder().AddJsFunction(
sigs.v_v(),
"(function js() {\n function a() {\n throw new Error(); };\n a(); })");
// Add a nop such that we don't always get position 1.
BUILD(r, WASM_NOP, WASM_CALL_FUNCTION0(js_throwing_index));
uint32_t wasm_index_1 = r.function()->func_index;
WasmFunctionCompiler& f2 = r.NewFunction<void>("call_main");
BUILD(f2, WASM_CALL_FUNCTION0(wasm_index_1));
uint32_t wasm_index_2 = f2.function_index();
Handle<JSFunction> js_wasm_wrapper = r.builder().WrapCode(wasm_index_2);
Handle<JSFunction> js_trampoline = Handle<JSFunction>::cast(
v8::Utils::OpenHandle(*v8::Local<v8::Function>::Cast(
CompileRun("(function callFn(fn) { fn(); })"))));
Isolate* isolate = js_wasm_wrapper->GetIsolate();
isolate->SetCaptureStackTraceForUncaughtExceptions(true, 10,
v8::StackTrace::kOverview);
Handle<Object> global(isolate->context()->global_object(), isolate);
MaybeHandle<Object> maybe_exc;
Handle<Object> args[] = {js_wasm_wrapper};
MaybeHandle<Object> returnObjMaybe =
Execution::TryCall(isolate, js_trampoline, global, 1, args,
Execution::MessageHandling::kReport, &maybe_exc);
CHECK(returnObjMaybe.is_null());
// Line and column are 1-based, so add 1 for the expected wasm output.
ExceptionInfo expected_exceptions[] = {
{"a", 3, 8}, // -
{"js", 4, 2}, // -
{"main", static_cast<int>(wasm_index_1) + 1, 3}, // -
{"call_main", static_cast<int>(wasm_index_2) + 1, 2}, // -
{"callFn", 1, 24} // -
};
CheckExceptionInfos(isolate, maybe_exc.ToHandleChecked(),
expected_exceptions);
}
// Trigger a trap in wasm, stack should be JS -> wasm -> wasm.
TEST(CollectDetailedWasmStack_WasmError) {
for (int pos_shift = 0; pos_shift < 3; ++pos_shift) {
// Test a position with 1, 2 or 3 bytes needed to represent it.
int unreachable_pos = 1 << (8 * pos_shift);
TestSignatures sigs;
// Create a WasmRunner with stack checks and traps enabled.
WasmRunner<int> r(kExecuteCompiled, "main", true);
std::vector<byte> code(unreachable_pos + 1, kExprNop);
code[unreachable_pos] = kExprUnreachable;
r.Build(code.data(), code.data() + code.size());
uint32_t wasm_index_1 = r.function()->func_index;
WasmFunctionCompiler& f2 = r.NewFunction<int>("call_main");
BUILD(f2, WASM_CALL_FUNCTION0(0));
uint32_t wasm_index_2 = f2.function_index();
Handle<JSFunction> js_wasm_wrapper = r.builder().WrapCode(wasm_index_2);
Handle<JSFunction> js_trampoline = Handle<JSFunction>::cast(
v8::Utils::OpenHandle(*v8::Local<v8::Function>::Cast(
CompileRun("(function callFn(fn) { fn(); })"))));
Isolate* isolate = js_wasm_wrapper->GetIsolate();
isolate->SetCaptureStackTraceForUncaughtExceptions(
true, 10, v8::StackTrace::kOverview);
Handle<Object> global(isolate->context()->global_object(), isolate);
MaybeHandle<Object> maybe_exc;
Handle<Object> args[] = {js_wasm_wrapper};
MaybeHandle<Object> maybe_return_obj =
Execution::TryCall(isolate, js_trampoline, global, 1, args,
Execution::MessageHandling::kReport, &maybe_exc);
CHECK(maybe_return_obj.is_null());
Handle<Object> exception = maybe_exc.ToHandleChecked();
static constexpr int kMainLocalsLength = 1;
// Line and column are 1-based, so add 1 for the expected wasm output.
const int expected_main_pos = unreachable_pos + kMainLocalsLength + 1;
ExceptionInfo expected_exceptions[] = {
{"main", static_cast<int>(wasm_index_1) + 1, expected_main_pos}, // -
{"call_main", static_cast<int>(wasm_index_2) + 1, 2}, // -
{"callFn", 1, 24} //-
};
CheckExceptionInfos(isolate, exception, expected_exceptions);
}
}
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