/*
* begin a GSYM block
*/
void CVmImageWriter::begin_gsym_block()
{
/*
* begin the block - GSYM blocks are always optional, since they're
* purely for debugging purposes
*/
begin_block("GSYM", FALSE);
/* remember where the prefix goes so we can fix it up later */
gsym_prefix_ = fp_->get_pos();
/* write a placehodler object count and the metaclass index */
fp_->write_uint4(0);
}
/*
* begin a SRCF block
*/
void CVmImageWriter::begin_srcf_block(int count)
{
/*
* begin the block - SRCF blocks are always optional, since they're
* purely for debugging purposes
*/
begin_block("SRCF", FALSE);
/* write the number of entries */
fp_->write_uint2(count);
/* each source line record is 8 bytes in the current format */
fp_->write_uint2(8);
}
/*
* Write a constant pool definition block
*/
void CVmImageWriter::write_pool_def(uint pool_id, uint32 page_count,
uint32 page_size, int mandatory)
{
char buf[16];
/* prepare the block's data */
oswp2(buf, pool_id);
oswp4(buf+2, page_count);
oswp4(buf+6, page_size);
/* open the block, write the data, and end the block */
begin_block("CPDF", mandatory);
fp_->write_bytes(buf, 10);
end_block();
}
/*
* Begin writing a constant pool page. This constructs the header and
* prepares for writing the bytes making up the page.
*/
void CVmImageWriter::begin_pool_page(uint pool_id, uint32 page_index,
int mandatory, uchar xor_mask)
{
char buf[16];
/* begin the block */
begin_block("CPPG", mandatory);
/* prepare the prefix */
oswp2(buf, pool_id);
oswp4(buf+2, page_index);
buf[6] = xor_mask;
/* write the prefix */
fp_->write_bytes(buf, 7);
}
/*
* begin an MHLS block
*/
void CVmImageWriter::begin_mhls_block()
{
/*
* begin the block - MHLS blocks are always optional, since they're
* purely for debugging purposes
*/
begin_block("MHLS", FALSE);
/* remember where the count goes so we can fix it up later */
mhls_cnt_pos_ = fp_->get_pos();
/* write a placehodler count */
fp_->write_uint4(0);
/* there are no entries yet */
mhls_cnt_ = 0;
}
/*
* Begin a symbolic names block
*/
void CVmImageWriter::begin_sym_block()
{
char buf[4];
/* begin the block */
begin_block("SYMD", FALSE);
/* remember where our placeholder goes */
symd_prefix_ = fp_->get_pos();
/* prepare the placeholder prefix, using a zero count for now */
oswp2(buf, 0);
/* write the prefix */
fp_->write_bytes(buf, 2);
/* we haven't written any symbolic name items yet */
symd_cnt_ = 0;
}
/*
* begin an SINI block
*/
void CVmImageWriter::begin_sini_block(ulong static_cs_ofs, ulong init_cnt)
{
/*
* begin the block - SINI blocks are mandatory, since the program
* depends upon static initializers being evaluated immediately
* after compilation
*/
begin_block("SINI", TRUE);
/*
* write the size of our header (including the size prefix); this
* serves as a simple versioning flag so we can tell if fields added
* at a later date are part of a given image file's data or not (if
* the header is too small to contain them, they're not present)
*/
fp_->write_uint4(12);
/* write the starting static code segment offset */
fp_->write_uint4(static_cs_ofs);
/* write the initializer count */
fp_->write_uint4(init_cnt);
}
/*
* Write a constant pool page
*/
void CVmImageWriter::write_pool_page(uint pool_id, uint32 page_index,
const char *page_data,
uint32 page_data_size, int mandatory,
uchar xor_mask)
{
char buf[16];
/* begin the block */
begin_block("CPPG", mandatory);
/* prepare the prefix */
oswp2(buf, pool_id);
oswp4(buf+2, page_index);
buf[6] = xor_mask;
/* write the prefix */
fp_->write_bytes(buf, 7);
/* write the page data, XOR'ing the data with the mask byte */
xor_and_write_bytes(page_data, page_data_size, xor_mask);
/* end the block */
end_block();
}
void Profiler::begin_frame()
{
// End the previous frame if any
end_frame();
begin_block("RunFrame");
}