Mercurial > hg > graal-compiler
diff src/share/vm/asm/codeBuffer.cpp @ 20435:094cbdffa87d
8054292: code comments leak in fastdebug builds
Summary: Added deallocation to destructor; hardened interface against misuse
Reviewed-by: kvn
author | drchase |
---|---|
date | Fri, 29 Aug 2014 19:45:49 -0400 |
parents | 833b0f92429a |
children | 7848fc12602b |
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--- a/src/share/vm/asm/codeBuffer.cpp Wed Sep 03 15:26:06 2014 +0400 +++ b/src/share/vm/asm/codeBuffer.cpp Fri Aug 29 19:45:49 2014 -0400 @@ -133,6 +133,10 @@ // free any overflow storage delete _overflow_arena; + // Claim is that stack allocation ensures resources are cleaned up. + // This is resource clean up, let's hope that all were properly copied out. + free_strings(); + #ifdef ASSERT // Save allocation type to execute assert in ~ResourceObj() // which is called after this destructor. @@ -704,7 +708,7 @@ relocate_code_to(&dest); // transfer strings and comments from buffer to blob - dest_blob->set_strings(_strings); + dest_blob->set_strings(_code_strings); // Done moving code bytes; were they the right size? assert(round_to(dest.total_content_size(), oopSize) == dest_blob->content_size(), "sanity"); @@ -1003,11 +1007,11 @@ void CodeBuffer::block_comment(intptr_t offset, const char * comment) { - _strings.add_comment(offset, comment); + _code_strings.add_comment(offset, comment); } const char* CodeBuffer::code_string(const char* str) { - return _strings.add_string(str); + return _code_strings.add_string(str); } class CodeString: public CHeapObj<mtCode> { @@ -1073,6 +1077,7 @@ } void CodeStrings::add_comment(intptr_t offset, const char * comment) { + check_valid(); CodeString* c = new CodeString(comment, offset); CodeString* inspos = (_strings == NULL) ? NULL : find_last(offset); @@ -1088,11 +1093,32 @@ } void CodeStrings::assign(CodeStrings& other) { + other.check_valid(); + // Cannot do following because CodeStrings constructor is not alway run! + assert(is_null(), "Cannot assign onto non-empty CodeStrings"); _strings = other._strings; + other.set_null_and_invalidate(); +} + +// Deep copy of CodeStrings for consistent memory management. +// Only used for actual disassembly so this is cheaper than reference counting +// for the "normal" fastdebug case. +void CodeStrings::copy(CodeStrings& other) { + other.check_valid(); + check_valid(); + assert(is_null(), "Cannot copy onto non-empty CodeStrings"); + CodeString* n = other._strings; + CodeString** ps = &_strings; + while (n != NULL) { + *ps = new CodeString(n->string(),n->offset()); + ps = &((*ps)->_next); + n = n->next(); + } } void CodeStrings::print_block_comment(outputStream* stream, intptr_t offset) const { - if (_strings != NULL) { + check_valid(); + if (_strings != NULL) { CodeString* c = find(offset); while (c && c->offset() == offset) { stream->bol(); @@ -1103,7 +1129,7 @@ } } - +// Also sets isNull() void CodeStrings::free() { CodeString* n = _strings; while (n) { @@ -1113,10 +1139,11 @@ delete n; n = p; } - _strings = NULL; + set_null_and_invalidate(); } const char* CodeStrings::add_string(const char * string) { + check_valid(); CodeString* s = new CodeString(string); s->set_next(_strings); _strings = s;