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VM: rename compile_inline_cache and refactor the loop body into emit_check_and_jump

locals-and-roots
Björn Lindqvist 2016-05-31 01:55:35 +02:00
parent dae2229957
commit a58f8c76f4
1 changed files with 33 additions and 31 deletions
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64
vm/inline_cache.cpp
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@ -34,58 +34,60 @@ void factor_vm::update_pic_count(cell type) {
}
struct inline_cache_jit : public jit {
fixnum index;
inline_cache_jit(cell generic_word, factor_vm* vm)
: jit(code_block_pic, generic_word, vm) {}
;
void compile_inline_cache(fixnum index, cell generic_word_, cell methods_,
cell cache_entries_, bool tail_call_p);
void emit_check_and_jump(cell ic_type, cell i, cell klass, cell method);
void emit_inline_cache(fixnum index, cell generic_word_, cell methods_,
cell cache_entries_, bool tail_call_p);
};
void inline_cache_jit::emit_check_and_jump(cell ic_type, cell i,
cell klass, cell method) {
/* Class equal? */
cell check_type = PIC_CHECK_TAG;
if (TAG(klass) != FIXNUM_TYPE)
check_type = PIC_CHECK_TUPLE;
/* The tag check can be skipped if it is the first one and we are
checking for the fixnum type which is 0. That is because the
AND instruction in the PIC_TAG template already sets the zero
flag. */
if (!(i == 0 && ic_type == PIC_TAG && klass == 0)) {
emit_with_literal(parent->special_objects[check_type], klass);
}
/* Yes? Jump to method */
emit_with_literal(parent->special_objects[PIC_HIT], method);
}
/* index: 0 = top of stack, 1 = item underneath, etc
cache_entries: array of class/method pairs */
/* Allocates memory */
void inline_cache_jit::compile_inline_cache(fixnum index, cell generic_word_,
cell methods_, cell cache_entries_,
bool tail_call_p) {
void inline_cache_jit::emit_inline_cache(fixnum index, cell generic_word_,
cell methods_, cell cache_entries_,
bool tail_call_p) {
data_root<word> generic_word(generic_word_, parent);
data_root<array> methods(methods_, parent);
data_root<array> cache_entries(cache_entries_, parent);
cell inline_cache_type =
determine_inline_cache_type(cache_entries.untagged());
parent->update_pic_count(inline_cache_type);
cell ic_type = determine_inline_cache_type(cache_entries.untagged());
parent->update_pic_count(ic_type);
/* Generate machine code to determine the object's class. */
emit_with_literal(parent->special_objects[PIC_LOAD],
tag_fixnum(-index * sizeof(cell)));
/* Put the tag of the object, or class of the tuple in a register. */
emit(parent->special_objects[inline_cache_type]);
emit(parent->special_objects[ic_type]);
/* Generate machine code to check, in turn, if the class is one of the cached
* entries. */
entries. */
for (cell i = 0; i < array_capacity(cache_entries.untagged()); i += 2) {
/* Class equal? */
cell klass = array_nth(cache_entries.untagged(), i);
cell check_type = PIC_CHECK_TAG;
if (TAG(klass) != FIXNUM_TYPE)
check_type = PIC_CHECK_TUPLE;
/* The tag check can be skipped if it is the first one and we are
checking for the fixnum type which is 0. That is because the
AND instruction in the PIC_TAG template already sets the zero
flag. */
if (i > 0 || inline_cache_type == PIC_TUPLE || klass > 0) {
emit_with_literal(parent->special_objects[check_type], klass);
}
/* Yes? Jump to method */
cell method = array_nth(cache_entries.untagged(), i + 1);
emit_with_literal(parent->special_objects[PIC_HIT], method);
emit_check_and_jump(ic_type, i, klass, method);
}
/* If none of the above conditionals tested true, then execution "falls
@ -117,8 +119,8 @@ code_block* factor_vm::compile_inline_cache(fixnum index, cell generic_word_,
data_root<array> cache_entries(cache_entries_, this);
inline_cache_jit jit(generic_word.value(), this);
jit.compile_inline_cache(index, generic_word.value(), methods.value(),
cache_entries.value(), tail_call_p);
jit.emit_inline_cache(index, generic_word.value(), methods.value(),
cache_entries.value(), tail_call_p);
code_block* code = jit.to_code_block(JIT_FRAME_SIZE);
initialize_code_block(code);
return code;