v8/src/compiler.h
vitalyr@chromium.org c919bb7d4a Disable aggressive optimizations on the last optimization attempt.
Only has effect on the loop invariant code motion and Check instructions
for now.

Review URL: http://codereview.chromium.org/6321007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6363 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-01-18 13:43:48 +00:00

279 lines
9.8 KiB
C++

// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_COMPILER_H_
#define V8_COMPILER_H_
#include "ast.h"
#include "frame-element.h"
#include "register-allocator.h"
#include "zone.h"
namespace v8 {
namespace internal {
class ScriptDataImpl;
// CompilationInfo encapsulates some information known at compile time. It
// is constructed based on the resources available at compile-time.
class CompilationInfo BASE_EMBEDDED {
public:
explicit CompilationInfo(Handle<Script> script);
explicit CompilationInfo(Handle<SharedFunctionInfo> shared_info);
explicit CompilationInfo(Handle<JSFunction> closure);
bool is_lazy() const { return (flags_ & IsLazy::mask()) != 0; }
bool is_eval() const { return (flags_ & IsEval::mask()) != 0; }
bool is_global() const { return (flags_ & IsGlobal::mask()) != 0; }
bool is_in_loop() const { return (flags_ & IsInLoop::mask()) != 0; }
FunctionLiteral* function() const { return function_; }
Scope* scope() const { return scope_; }
Handle<Code> code() const { return code_; }
Handle<JSFunction> closure() const { return closure_; }
Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
Handle<Script> script() const { return script_; }
v8::Extension* extension() const { return extension_; }
ScriptDataImpl* pre_parse_data() const { return pre_parse_data_; }
Handle<Context> calling_context() const { return calling_context_; }
int osr_ast_id() const { return osr_ast_id_; }
void MarkAsEval() {
ASSERT(!is_lazy());
flags_ |= IsEval::encode(true);
}
void MarkAsGlobal() {
ASSERT(!is_lazy());
flags_ |= IsGlobal::encode(true);
}
void MarkAsInLoop() {
ASSERT(is_lazy());
flags_ |= IsInLoop::encode(true);
}
void SetFunction(FunctionLiteral* literal) {
ASSERT(function_ == NULL);
function_ = literal;
}
void SetScope(Scope* scope) {
ASSERT(scope_ == NULL);
scope_ = scope;
}
void SetCode(Handle<Code> code) { code_ = code; }
void SetExtension(v8::Extension* extension) {
ASSERT(!is_lazy());
extension_ = extension;
}
void SetPreParseData(ScriptDataImpl* pre_parse_data) {
ASSERT(!is_lazy());
pre_parse_data_ = pre_parse_data;
}
void SetCallingContext(Handle<Context> context) {
ASSERT(is_eval());
calling_context_ = context;
}
void SetOsrAstId(int osr_ast_id) {
ASSERT(IsOptimizing());
osr_ast_id_ = osr_ast_id;
}
bool has_global_object() const {
return !closure().is_null() && (closure()->context()->global() != NULL);
}
GlobalObject* global_object() const {
return has_global_object() ? closure()->context()->global() : NULL;
}
// Accessors for the different compilation modes.
bool IsOptimizing() const { return mode_ == OPTIMIZE; }
bool IsOptimizable() const { return mode_ == BASE; }
void SetOptimizing(int osr_ast_id) {
SetMode(OPTIMIZE);
osr_ast_id_ = osr_ast_id;
}
void DisableOptimization();
// Deoptimization support.
bool HasDeoptimizationSupport() const { return supports_deoptimization_; }
void EnableDeoptimizationSupport() {
ASSERT(IsOptimizable());
supports_deoptimization_ = true;
}
// Determine whether or not we can adaptively optimize.
bool AllowOptimize() {
return V8::UseCrankshaft() && !closure_.is_null();
}
private:
// Compilation mode.
// BASE is generated by the full codegen, optionally prepared for bailouts.
// OPTIMIZE is optimized code generated by the Hydrogen-based backend.
// NONOPT is generated by the full codegen or the classic backend
// and is not prepared for recompilation/bailouts. These functions
// are never recompiled.
enum Mode {
BASE,
OPTIMIZE,
NONOPT
};
CompilationInfo() : function_(NULL) {}
void Initialize(Mode mode) {
mode_ = V8::UseCrankshaft() ? mode : NONOPT;
}
void SetMode(Mode mode) {
ASSERT(V8::UseCrankshaft());
mode_ = mode;
}
// Flags using template class BitField<type, start, length>. All are
// false by default.
//
// Compilation is either eager or lazy.
class IsLazy: public BitField<bool, 0, 1> {};
// Flags that can be set for eager compilation.
class IsEval: public BitField<bool, 1, 1> {};
class IsGlobal: public BitField<bool, 2, 1> {};
// Flags that can be set for lazy compilation.
class IsInLoop: public BitField<bool, 3, 1> {};
unsigned flags_;
// Fields filled in by the compilation pipeline.
// AST filled in by the parser.
FunctionLiteral* function_;
// The scope of the function literal as a convenience. Set to indicate
// that scopes have been analyzed.
Scope* scope_;
// The compiled code.
Handle<Code> code_;
// Possible initial inputs to the compilation process.
Handle<JSFunction> closure_;
Handle<SharedFunctionInfo> shared_info_;
Handle<Script> script_;
// Fields possibly needed for eager compilation, NULL by default.
v8::Extension* extension_;
ScriptDataImpl* pre_parse_data_;
// The context of the caller is needed for eval code, and will be a null
// handle otherwise.
Handle<Context> calling_context_;
// Compilation mode flag and whether deoptimization is allowed.
Mode mode_;
bool supports_deoptimization_;
int osr_ast_id_;
DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
};
// The V8 compiler
//
// General strategy: Source code is translated into an anonymous function w/o
// parameters which then can be executed. If the source code contains other
// functions, they will be compiled and allocated as part of the compilation
// of the source code.
// Please note this interface returns shared function infos. This means you
// need to call Factory::NewFunctionFromSharedFunctionInfo before you have a
// real function with a context.
class Compiler : public AllStatic {
public:
// Default maximum number of function optimization attempts before we
// give up.
static const int kDefaultMaxOptCount = 10;
// All routines return a SharedFunctionInfo.
// If an error occurs an exception is raised and the return handle
// contains NULL.
// Compile a String source within a context.
static Handle<SharedFunctionInfo> Compile(Handle<String> source,
Handle<Object> script_name,
int line_offset,
int column_offset,
v8::Extension* extension,
ScriptDataImpl* pre_data,
Handle<Object> script_data,
NativesFlag is_natives_code);
// Compile a String source within a context for Eval.
static Handle<SharedFunctionInfo> CompileEval(Handle<String> source,
Handle<Context> context,
bool is_global);
// Compile from function info (used for lazy compilation). Returns true on
// success and false if the compilation resulted in a stack overflow.
static bool CompileLazy(CompilationInfo* info);
// Compile a shared function info object (the function is possibly lazily
// compiled).
static Handle<SharedFunctionInfo> BuildFunctionInfo(FunctionLiteral* node,
Handle<Script> script);
// Set the function info for a newly compiled function.
static void SetFunctionInfo(Handle<SharedFunctionInfo> function_info,
FunctionLiteral* lit,
bool is_toplevel,
Handle<Script> script);
#ifdef ENABLE_DEBUGGER_SUPPORT
static bool MakeCodeForLiveEdit(CompilationInfo* info);
#endif
static void RecordFunctionCompilation(Logger::LogEventsAndTags tag,
Handle<String> name,
int start_position,
CompilationInfo* info);
};
// During compilation we need a global list of handles to constants
// for frame elements. When the zone gets deleted, we make sure to
// clear this list of handles as well.
class CompilationZoneScope : public ZoneScope {
public:
explicit CompilationZoneScope(ZoneScopeMode mode) : ZoneScope(mode) { }
virtual ~CompilationZoneScope() {
if (ShouldDeleteOnExit()) {
FrameElement::ClearConstantList();
Result::ClearConstantList();
}
}
};
} } // namespace v8::internal
#endif // V8_COMPILER_H_