DFGOSRExitCompiler.cpp [plain text]
#include "config.h"
#include "DFGOSRExitCompiler.h"
#if ENABLE(DFG_JIT)
#include "CallFrame.h"
#include "LinkBuffer.h"
#include "RepatchBuffer.h"
namespace JSC { namespace DFG {
extern "C" {
void compileOSRExit(ExecState* exec)
{
CodeBlock* codeBlock = exec->codeBlock();
ASSERT(codeBlock);
ASSERT(codeBlock->getJITType() == JITCode::DFGJIT);
JSGlobalData* globalData = &exec->globalData();
uint32_t exitIndex = globalData->osrExitIndex;
OSRExit& exit = codeBlock->osrExit(exitIndex);
SpeculationRecovery* recovery = 0;
if (exit.m_recoveryIndex)
recovery = &codeBlock->speculationRecovery(exit.m_recoveryIndex - 1);
#if DFG_ENABLE(DEBUG_VERBOSE)
fprintf(stderr, "Generating OSR exit #%u (bc#%u, @%u, %s) for code block %p.\n", exitIndex, exit.m_codeOrigin.bytecodeIndex, exit.m_nodeIndex, exitKindToString(exit.m_kind), codeBlock);
#endif
{
AssemblyHelpers jit(globalData, codeBlock);
OSRExitCompiler exitCompiler(jit);
exitCompiler.compileExit(exit, recovery);
LinkBuffer patchBuffer(*globalData, &jit);
exit.m_code = patchBuffer.finalizeCode();
#if DFG_ENABLE(DEBUG_VERBOSE)
fprintf(stderr, "OSR exit code at [%p, %p).\n", patchBuffer.debugAddress(), static_cast<char*>(patchBuffer.debugAddress()) + patchBuffer.debugSize());
#endif
}
{
RepatchBuffer repatchBuffer(codeBlock);
repatchBuffer.relink(exit.m_check.codeLocationForRepatch(codeBlock), CodeLocationLabel(exit.m_code.code()));
}
globalData->osrExitJumpDestination = exit.m_code.code().executableAddress();
}
}
} }
#endif // ENABLE(DFG_JIT)