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[wasm] Generate a debug name from the function index

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Up until now, the debug name of a WebAssembly function was "unknown"
if no name was provided in the name section. With this CL we use the
function index to generate the name "wasm#index" as the debug name.
This debug name is used e.g. for --print-wasm-code or
--trace-turbo-graph


R=clemensh@chromium.org

Change-Id: Ie9b14437fbdef8fd6602eab0d89e415599445099
Reviewed-on: https://chromium-review.googlesource.com/461923
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44230}
This commit is contained in:
Andreas Haas 2017-03-29 15:06:18 +02:00 committed by Commit Bot
parent 994a34f0fa
commit f89b2970b8
1 changed files with 19 additions and 2 deletions
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21
src/compiler/wasm-compiler.cc
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@ -3890,6 +3890,23 @@ SourcePositionTable* WasmCompilationUnit::BuildGraphForWasmFunction(
return source_position_table;
}
namespace {
Vector<const char> GetDebugName(Zone* zone, wasm::WasmName name, int index) {
if (!name.is_empty()) {
return name;
}
constexpr int kBufferLength = 15;
EmbeddedVector<char, kBufferLength> name_vector;
int name_len = SNPrintF(name_vector, "wasm#%d", index);
DCHECK(name_len > 0 && name_len < name_vector.length());
char* index_name = zone->NewArray<char>(name_len);
memcpy(index_name, name_vector.start(), name_len);
return Vector<const char>(index_name, name_len);
}
} // namespace
WasmCompilationUnit::WasmCompilationUnit(Isolate* isolate,
wasm::ModuleBytesEnv* module_env,
const wasm::WasmFunction* function)
@ -3920,8 +3937,8 @@ WasmCompilationUnit::WasmCompilationUnit(Isolate* isolate,
InstructionSelector::SupportedMachineOperatorFlags(),
InstructionSelector::AlignmentRequirements()))),
compilation_zone_(isolate->allocator(), ZONE_NAME),
info_(name, isolate, &compilation_zone_,
Code::ComputeFlags(Code::WASM_FUNCTION)),
info_(GetDebugName(&compilation_zone_, name, index), isolate,
&compilation_zone_, Code::ComputeFlags(Code::WASM_FUNCTION)),
func_index_(index),
protected_instructions_(&compilation_zone_) {
// Create and cache this node in the main thread.