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Make --trace-deopt --code-comments print the Lithium instruction that caused deoptimization.

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This saves us from manually searching the disassembled code for the bailout id
when looking for the reason for deoptimization.
Review URL: http://codereview.chromium.org/8008013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9414 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
fschneider@chromium.org 2011-09-23 12:13:27 +00:00
parent 901f20b052
commit 683decd4ae
1 changed files with 20 additions and 0 deletions
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20
src/deoptimizer.cc
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@ -347,6 +347,26 @@ Deoptimizer::Deoptimizer(Isolate* isolate,
if (type == EAGER) {
ASSERT(from == NULL);
optimized_code_ = function_->code();
if (FLAG_trace_deopt && FLAG_code_comments) {
// Print instruction associated with this bailout.
const char* last_comment = NULL;
int mask = RelocInfo::ModeMask(RelocInfo::COMMENT)
| RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY);
for (RelocIterator it(optimized_code_, mask); !it.done(); it.next()) {
RelocInfo* info = it.rinfo();
if (info->rmode() == RelocInfo::COMMENT) {
last_comment = reinterpret_cast<const char*>(info->data());
}
if (info->rmode() == RelocInfo::RUNTIME_ENTRY) {
unsigned id = Deoptimizer::GetDeoptimizationId(
info->target_address(), Deoptimizer::EAGER);
if (id == bailout_id && last_comment != NULL) {
PrintF(" %s\n", last_comment);
break;
}
}
}
}
} else if (type == LAZY) {
optimized_code_ = FindDeoptimizingCodeFromAddress(from);
ASSERT(optimized_code_ != NULL);