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VM: Refactor callbacks to Factor style

db4
Erik Charlebois 2013-05-11 21:47:11 -04:00
parent 22eed89484
commit 7aae3c04ce
2 changed files with 104 additions and 122 deletions
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99
vm/callbacks.cpp
View File

@ -1,26 +1,20 @@
#include "master.hpp"
namespace factor
{
namespace factor {
callback_heap::callback_heap(cell size, factor_vm *parent_) :
seg(new segment(size,true)),
here(seg->start),
parent(parent_) {}
callback_heap::callback_heap(cell size, factor_vm* parent_)
: seg(new segment(size, true)), here(seg->start), parent(parent_) {}
callback_heap::~callback_heap()
{
callback_heap::~callback_heap() {
delete seg;
seg = NULL;
}
void factor_vm::init_callbacks(cell size)
{
callbacks = new callback_heap(size,this);
void factor_vm::init_callbacks(cell size) {
callbacks = new callback_heap(size, this);
}
bool callback_heap::setup_seh_p()
{
bool callback_heap::setup_seh_p() {
#if defined(WINDOWS) && defined(FACTOR_X86)
return true;
#else
@ -28,8 +22,7 @@ bool callback_heap::setup_seh_p()
#endif
}
bool callback_heap::return_takes_param_p()
{
bool callback_heap::return_takes_param_p() {
#if defined(FACTOR_X86) || defined(FACTOR_AMD64)
return true;
#else
@ -37,71 +30,69 @@ bool callback_heap::return_takes_param_p()
#endif
}
instruction_operand callback_heap::callback_operand(code_block *stub, cell index)
{
instruction_operand callback_heap::callback_operand(code_block* stub,
cell index) {
tagged<array> code_template(parent->special_objects[CALLBACK_STUB]);
tagged<byte_array> relocation_template(array_nth(code_template.untagged(),0));
tagged<byte_array> relocation_template(
array_nth(code_template.untagged(), 0));
relocation_entry entry(relocation_template->data<relocation_entry>()[index]);
return instruction_operand(entry,stub,0);
return instruction_operand(entry, stub, 0);
}
void callback_heap::store_callback_operand(code_block *stub, cell index)
{
parent->store_external_address(callback_operand(stub,index));
void callback_heap::store_callback_operand(code_block* stub, cell index) {
parent->store_external_address(callback_operand(stub, index));
}
void callback_heap::store_callback_operand(code_block *stub, cell index, cell value)
{
callback_operand(stub,index).store_value(value);
void callback_heap::store_callback_operand(code_block* stub, cell index,
cell value) {
callback_operand(stub, index).store_value(value);
}
void callback_heap::update(code_block *stub)
{
store_callback_operand(stub,setup_seh_p() ? 2 : 1,(cell)callback_entry_point(stub));
void callback_heap::update(code_block* stub) {
store_callback_operand(stub, setup_seh_p() ? 2 : 1,
(cell) callback_entry_point(stub));
stub->flush_icache();
}
code_block *callback_heap::add(cell owner, cell return_rewind)
{
code_block* callback_heap::add(cell owner, cell return_rewind) {
tagged<array> code_template(parent->special_objects[CALLBACK_STUB]);
tagged<byte_array> insns(array_nth(code_template.untagged(),1));
tagged<byte_array> insns(array_nth(code_template.untagged(), 1));
cell size = array_capacity(insns.untagged());
cell bump = align(size + sizeof(code_block),data_alignment);
if(here + bump > seg->end) fatal_error("Out of callback space",0);
cell bump = align(size + sizeof(code_block), data_alignment);
if (here + bump > seg->end)
fatal_error("Out of callback space", 0);
free_heap_block *free_block = (free_heap_block *)here;
free_heap_block* free_block = (free_heap_block*)here;
free_block->make_free(bump);
here += bump;
code_block *stub = (code_block *)free_block;
code_block* stub = (code_block*)free_block;
stub->owner = owner;
stub->parameters = false_object;
stub->relocation = false_object;
memcpy(stub->entry_point(),insns->data<void>(),size);
memcpy(stub->entry_point(), insns->data<void>(), size);
/* Store VM pointer */
store_callback_operand(stub,0,(cell)parent);
store_callback_operand(stub, 0, (cell) parent);
cell index;
if(setup_seh_p())
{
store_callback_operand(stub,1);
if (setup_seh_p()) {
store_callback_operand(stub, 1);
index = 1;
}
else
} else
index = 0;
/* Store VM pointer */
store_callback_operand(stub,index + 2,(cell)parent);
store_callback_operand(stub, index + 2, (cell) parent);
/* On x86, the RET instruction takes an argument which depends on
the callback's calling convention */
if(return_takes_param_p())
store_callback_operand(stub,index + 3,return_rewind);
if (return_takes_param_p())
store_callback_operand(stub, index + 3, return_rewind);
update(stub);
@ -109,31 +100,27 @@ code_block *callback_heap::add(cell owner, cell return_rewind)
}
struct callback_updater {
callback_heap *callbacks;
callback_heap* callbacks;
explicit callback_updater(callback_heap *callbacks_) : callbacks(callbacks_) {}
explicit callback_updater(callback_heap* callbacks_)
: callbacks(callbacks_) {}
void operator()(code_block *stub)
{
callbacks->update(stub);
}
void operator()(code_block* stub) { callbacks->update(stub); }
};
void callback_heap::update()
{
void callback_heap::update() {
callback_updater updater(this);
each_callback(updater);
}
/* Allocates memory */
void factor_vm::primitive_callback()
{
void factor_vm::primitive_callback() {
cell return_rewind = to_cell(ctx->pop());
tagged<word> w(ctx->pop());
w.untag_check(this);
void* func = callbacks->add(w.value(),return_rewind)->entry_point();
void* func = callbacks->add(w.value(), return_rewind)->entry_point();
CODE_TO_FUNCTION_POINTER_CALLBACK(this, func);
ctx->push(allot_alien(func));
}

39
vm/callbacks.hpp
View File

@ -1,5 +1,4 @@
namespace factor
{
namespace factor {
/* The callback heap is used to store the machine code that alien-callbacks
actually jump to when C code invokes them.
@ -25,42 +24,38 @@ saving the image will deallocate any code heap entries that were only reachable
from the callback heap in the previous session when the image was saved. */
struct callback_heap {
segment *seg;
segment* seg;
cell here;
factor_vm *parent;
factor_vm* parent;
explicit callback_heap(cell size, factor_vm *parent);
explicit callback_heap(cell size, factor_vm* parent);
~callback_heap();
void *callback_entry_point(code_block *stub)
{
word *w = (word *)UNTAG(stub->owner);
void* callback_entry_point(code_block* stub) {
word* w = (word*)UNTAG(stub->owner);
return w->entry_point;
}
bool setup_seh_p();
bool return_takes_param_p();
instruction_operand callback_operand(code_block *stub, cell index);
void store_callback_operand(code_block *stub, cell index);
void store_callback_operand(code_block *stub, cell index, cell value);
instruction_operand callback_operand(code_block* stub, cell index);
void store_callback_operand(code_block* stub, cell index);
void store_callback_operand(code_block* stub, cell index, cell value);
void update(code_block *stub);
void update(code_block* stub);
code_block *add(cell owner, cell return_rewind);
code_block* add(cell owner, cell return_rewind);
void update();
code_block *next(code_block *stub)
{
return (code_block *)((cell)stub + stub->size());
code_block* next(code_block* stub) {
return (code_block*)((cell) stub + stub->size());
}
template<typename Iterator> void each_callback(Iterator &iter)
{
code_block *scan = (code_block *)seg->start;
code_block *end = (code_block *)here;
while(scan < end)
{
template <typename Iterator> void each_callback(Iterator& iter) {
code_block* scan = (code_block*)seg->start;
code_block* end = (code_block*)here;
while (scan < end) {
iter(scan);
scan = next(scan);
}