#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <assert.h>

#include "BaseRuntime.h"

#include "sp_vm_engine.h"

#include "x86/jit_x86.h"

#include "sp_vm_basecontext.h"

#include "engine2.h"

using namespace SourcePawn;

BaseRuntime::BaseRuntime() : m_Debug(&m_plugin), m_pPlugin(&m_plugin), m_pCtx(NULL), 

m_PubFuncs(NULL), m_PubJitFuncs(NULL), m_pCo(NULL), m_CompSerial(0)

{

	memset(&m_plugin, 0, sizeof(m_plugin));

	m_FuncCache = NULL;

	m_MaxFuncs = 0;

	m_NumFuncs = 0;

}

BaseRuntime::~BaseRuntime()

{

	for (uint32_t i = 0; i < m_pPlugin->num_publics; i++)

	{

		delete m_PubFuncs[i];

		m_PubFuncs[i] = NULL;

	}

	delete [] m_PubFuncs;

	delete [] m_PubJitFuncs;

	for (unsigned int i = 0; i < m_NumFuncs; i++)

	{

		delete m_FuncCache[i];

	}

	free(m_FuncCache);

	delete m_pCtx;

	delete m_pCo;

	free(m_pPlugin->base);

	delete [] m_pPlugin->memory;

	delete [] m_pPlugin->publics;

	delete [] m_pPlugin->pubvars;

	delete [] m_pPlugin->natives;

	free(m_pPlugin->name);

}

static cell_t InvalidNative(IPluginContext *pCtx, const cell_t *params)

{

	return pCtx->ThrowNativeErrorEx(SP_ERROR_INVALID_NATIVE, "Invalid native");

}

int BaseRuntime::CreateFromMemory(sp_file_hdr_t *hdr, uint8_t *base)

{

	int set_err;

	char *nameptr;

	uint8_t sectnum = 0;

	sp_plugin_t *plugin = m_pPlugin;

	sp_file_section_t *secptr = (sp_file_section_t *)(base + sizeof(sp_file_hdr_t));

	memset(plugin, 0, sizeof(sp_plugin_t));

	plugin->base = base;

	plugin->base_size = hdr->imagesize;

	set_err = SP_ERROR_NONE;

	/* We have to read the name section first */

	for (sectnum = 0; sectnum < hdr->sections; sectnum++)

	{

		nameptr = (char *)(base + hdr->stringtab + secptr[sectnum].nameoffs);

		if (strcmp(nameptr, ".names") == 0)

		{

			plugin->stringbase = (const char *)(base + secptr[sectnum].dataoffs);

			break;

		}

	}

	sectnum = 0;

	/* Now read the rest of the sections */

	while (sectnum < hdr->sections)

	{

		nameptr = (char *)(base + hdr->stringtab + secptr->nameoffs);

		if (!(plugin->pcode) && !strcmp(nameptr, ".code"))

		{

			sp_file_code_t *cod = (sp_file_code_t *)(base + secptr->dataoffs);

			if (cod->codeversion < SP_CODEVERS_JIT1)

			{

				return SP_ERROR_CODE_TOO_OLD;

			}

			else if (cod->codeversion > SP_CODEVERS_JIT2)

			{

				return SP_ERROR_CODE_TOO_NEW;

			}

			plugin->pcode = base + secptr->dataoffs + cod->code;

			plugin->pcode_size = cod->codesize;

			plugin->flags = cod->flags;

			plugin->pcode_version = cod->codeversion;

		}

		else if (!(plugin->data) && !strcmp(nameptr, ".data"))

		{

			sp_file_data_t *dat = (sp_file_data_t *)(base + secptr->dataoffs);

			plugin->data = base + secptr->dataoffs + dat->data;

			plugin->data_size = dat->datasize;

			plugin->mem_size = dat->memsize;

			plugin->memory = new uint8_t[plugin->mem_size];

			memcpy(plugin->memory, plugin->data, plugin->data_size);

		}

		else if ((plugin->publics == NULL) && !strcmp(nameptr, ".publics"))

		{

			sp_file_publics_t *publics;

			publics = (sp_file_publics_t *)(base + secptr->dataoffs);

			plugin->num_publics = secptr->size / sizeof(sp_file_publics_t);

			if (plugin->num_publics > 0)

			{

				plugin->publics = new sp_public_t[plugin->num_publics];

				for (uint32_t i = 0; i < plugin->num_publics; i++)

				{

					plugin->publics[i].code_offs = publics[i].address;

					plugin->publics[i].funcid = (i << 1) | 1;

					plugin->publics[i].name = plugin->stringbase + publics[i].name;

				}

			}

		}

		else if ((plugin->pubvars == NULL) && !strcmp(nameptr, ".pubvars"))

		{

			sp_file_pubvars_t *pubvars;

			pubvars = (sp_file_pubvars_t *)(base + secptr->dataoffs);

			plugin->num_pubvars = secptr->size / sizeof(sp_file_pubvars_t);

			if (plugin->num_pubvars > 0)

			{

				plugin->pubvars = new sp_pubvar_t[plugin->num_pubvars];

				for (uint32_t i = 0; i < plugin->num_pubvars; i++)

				{

					plugin->pubvars[i].name = plugin->stringbase + pubvars[i].name;

					plugin->pubvars[i].offs = (cell_t *)(plugin->memory + pubvars[i].address);

				}

			}

		}

		else if ((plugin->natives == NULL) && !strcmp(nameptr, ".natives"))

		{

			sp_file_natives_t *natives;

			natives = (sp_file_natives_t *)(base + secptr->dataoffs);

			plugin->num_natives = secptr->size / sizeof(sp_file_natives_t);

			if (plugin->num_natives > 0)

			{

				plugin->natives = new sp_native_t[plugin->num_natives];

				for (uint32_t i = 0; i < plugin->num_natives; i++)

				{

					plugin->natives[i].flags = 0;

					plugin->natives[i].pfn = InvalidNative;

					plugin->natives[i].status = SP_NATIVE_UNBOUND;

					plugin->natives[i].user = NULL;

					plugin->natives[i].name = plugin->stringbase + natives[i].name;

				}

			}

		}

		else if (!(plugin->debug.files) && !strcmp(nameptr, ".dbg.files"))

		{

			plugin->debug.files = (sp_fdbg_file_t *)(base + secptr->dataoffs);

		}

		else if (!(plugin->debug.lines) && !strcmp(nameptr, ".dbg.lines"))

		{

			plugin->debug.lines = (sp_fdbg_line_t *)(base + secptr->dataoffs);

		}

		else if (!(plugin->debug.symbols) && !strcmp(nameptr, ".dbg.symbols"))

		{

			plugin->debug.symbols = (sp_fdbg_symbol_t *)(base + secptr->dataoffs);

		}

		else if (!(plugin->debug.lines_num) && !strcmp(nameptr, ".dbg.info"))

		{

			sp_fdbg_info_t *inf = (sp_fdbg_info_t *)(base + secptr->dataoffs);

			plugin->debug.files_num = inf->num_files;

			plugin->debug.lines_num = inf->num_lines;

			plugin->debug.syms_num = inf->num_syms;

		}

		else if (!(plugin->debug.stringbase) && !strcmp(nameptr, ".dbg.strings"))

		{

			plugin->debug.stringbase = (const char *)(base + secptr->dataoffs);

		}

		secptr++;

		sectnum++;

	}

	if (plugin->pcode == NULL || plugin->data == NULL)

	{

		return SP_ERROR_FILE_FORMAT;

	}

	if ((plugin->flags & SP_FLAG_DEBUG) && (!(plugin->debug.files) || !(plugin->debug.lines) || !(plugin->debug.symbols)))

	{

		return SP_ERROR_FILE_FORMAT;

	}

	if (m_pPlugin->num_publics > 0)

	{

		m_PubFuncs = new CFunction *[m_pPlugin->num_publics];

		memset(m_PubFuncs, 0, sizeof(CFunction *) * m_pPlugin->num_publics);

		m_PubJitFuncs = new JitFunction *[m_pPlugin->num_publics];

		memset(m_PubJitFuncs, 0, sizeof(JitFunction *) * m_pPlugin->num_publics);

	}

	m_pPlugin->profiler = g_engine2.GetProfiler();

	m_pCtx = new BaseContext(this);

	m_pCo = g_Jit.StartCompilation(this);

	return SP_ERROR_NONE;

}

int BaseRuntime::FindNativeByName(const char *name, uint32_t *index)

{

	int high;

	high = m_pPlugin->num_natives - 1;

	for (uint32_t i=0; i<m_pPlugin->num_natives; i++)

	{

		if (strcmp(m_pPlugin->natives[i].name, name) == 0)

		{

			if (index)

			{

				*index = i;

			}

			return SP_ERROR_NONE;

		}

	}

	return SP_ERROR_NOT_FOUND;

}

int BaseRuntime::GetNativeByIndex(uint32_t index, sp_native_t **native)

{

	if (index >= m_pPlugin->num_natives)

	{

		return SP_ERROR_INDEX;

	}

	if (native)

	{

		*native = &(m_pPlugin->natives[index]);

	}

	return SP_ERROR_NONE;

}

uint32_t BaseRuntime::GetNativesNum()

{

	return m_pPlugin->num_natives;

}

int BaseRuntime::FindPublicByName(const char *name, uint32_t *index)

{

	int diff, high, low;

	uint32_t mid;

	high = m_pPlugin->num_publics - 1;

	low = 0;

	while (low <= high)

	{

		mid = (low + high) / 2;

		diff = strcmp(m_pPlugin->publics[mid].name, name);

		if (diff == 0)

		{

			if (index)

			{

				*index = mid;

			}

			return SP_ERROR_NONE;

		} else if (diff < 0) {

			low = mid + 1;

		} else {

			high = mid - 1;

		}

	}

	return SP_ERROR_NOT_FOUND;

}

int BaseRuntime::GetPublicByIndex(uint32_t index, sp_public_t **pblic)

{

	if (index >= m_pPlugin->num_publics)

	{

		return SP_ERROR_INDEX;

	}

	if (pblic)

	{

		*pblic = &(m_pPlugin->publics[index]);

	}

	return SP_ERROR_NONE;

}

uint32_t BaseRuntime::GetPublicsNum()

{

	return m_pPlugin->num_publics;

}

int BaseRuntime::GetPubvarByIndex(uint32_t index, sp_pubvar_t **pubvar)

{

	if (index >= m_pPlugin->num_pubvars)

	{

		return SP_ERROR_INDEX;

	}

	if (pubvar)

	{

		*pubvar = &(m_pPlugin->pubvars[index]);

	}

	return SP_ERROR_NONE;

}

int BaseRuntime::FindPubvarByName(const char *name, uint32_t *index)

{

	int diff, high, low;

	uint32_t mid;

	high = m_pPlugin->num_pubvars - 1;

	low = 0;

	while (low <= high)

	{

		mid = (low + high) / 2;

		diff = strcmp(m_pPlugin->pubvars[mid].name, name);

		if (diff == 0)

		{

			if (index)

			{

				*index = mid;

			}

			return SP_ERROR_NONE;

		}

		else if (diff < 0)

		{

			low = mid + 1;

		}

		else

		{

			high = mid - 1;

		}

	}

	return SP_ERROR_NOT_FOUND;

}

int BaseRuntime::GetPubvarAddrs(uint32_t index, cell_t *local_addr, cell_t **phys_addr)

{

	if (index >= m_pPlugin->num_pubvars)

	{

		return SP_ERROR_INDEX;

	}

	*local_addr = (uint8_t *)m_pPlugin->pubvars[index].offs - m_pPlugin->memory;

	*phys_addr = m_pPlugin->pubvars[index].offs;

	return SP_ERROR_NONE;

}

uint32_t BaseRuntime::GetPubVarsNum()

{

	return m_pPlugin->num_pubvars;

}

IPluginContext *BaseRuntime::GetDefaultContext()

{

	return m_pCtx;

}

IPluginDebugInfo *BaseRuntime::GetDebugInfo()

{

	return &m_Debug;

}

IPluginFunction *BaseRuntime::GetFunctionById(funcid_t func_id)

{

	CFunction *pFunc = NULL;

	if (func_id & 1)

	{

		func_id >>= 1;

		if (func_id >= m_pPlugin->num_publics)

		{

			return NULL;

		}

		pFunc = m_PubFuncs[func_id];

		if (!pFunc)

		{

			m_PubFuncs[func_id] = new CFunction(this, 

				(func_id << 1) | 1,

				func_id);

			pFunc = m_PubFuncs[func_id];

		}

	}

	return pFunc;

}

IPluginFunction *BaseRuntime::GetFunctionByName(const char *public_name)

{

	uint32_t index;

	if (FindPublicByName(public_name, &index) != SP_ERROR_NONE)

	{

		return NULL;

	}

	CFunction *pFunc = m_PubFuncs[index];

	if (!pFunc)

	{

		sp_public_t *pub = NULL;

		GetPublicByIndex(index, &pub);

		if (pub)

		{

			m_PubFuncs[index] = new CFunction(this, (index << 1) | 1, index);

		}

		pFunc = m_PubFuncs[index];

	}

	return pFunc;

}

bool BaseRuntime::IsDebugging()

{

	return true;

}

void BaseRuntime::SetPauseState(bool paused)

{

	if (paused)

	{

		m_pPlugin->run_flags |= SPFLAG_PLUGIN_PAUSED;

	}

	else

	{

		m_pPlugin->run_flags &= ~SPFLAG_PLUGIN_PAUSED;

	}

}

bool BaseRuntime::IsPaused()

{

	return ((m_pPlugin->run_flags & SPFLAG_PLUGIN_PAUSED) == SPFLAG_PLUGIN_PAUSED);

}

size_t BaseRuntime::GetMemUsage()

{

	size_t mem = 0;

	mem += sizeof(this);

	mem += sizeof(sp_plugin_t);

	mem += sizeof(BaseContext);

	mem += m_pPlugin->base_size;

	return mem;

}

BaseContext *BaseRuntime::GetBaseContext()

{

	return m_pCtx;

}

int BaseRuntime::ApplyCompilationOptions(ICompilation *co)

{

	if (co == NULL)

	{

		return SP_ERROR_NONE;

	}

	m_pCo = g_Jit.ApplyOptions(m_pCo, co);

	return SP_ERROR_NONE;

}

JitFunction *BaseRuntime::GetJittedFunction(uint32_t idx)

{

	assert(idx <= m_NumFuncs);

	if (idx == 0 || idx > m_NumFuncs)

	{

		return NULL;

	}

	return m_FuncCache[idx - 1];

}

uint32_t BaseRuntime::AddJittedFunction(JitFunction *fn)

{

	if (m_NumFuncs + 1 > m_MaxFuncs)

	{

		if (m_MaxFuncs == 0)

		{

			m_MaxFuncs = 8;

		}

		else

		{

			m_MaxFuncs *= 2;

		}

		m_FuncCache = (JitFunction **)realloc(

			m_FuncCache,

			sizeof(JitFunction *) * m_MaxFuncs);

	}

	m_FuncCache[m_NumFuncs++] = fn;

	return m_NumFuncs;

}