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YJIT: Refactor getlocal and setlocal insns (#7320)

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This commit is contained in:
Takashi Kokubun 2023-02-16 08:29:45 -08:00 committed by GitHub
parent b4c38f3c59
commit 8f22dc39f3
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GPG Key ID: 4AEE18F83AFDEB23
Notes: git 2023-02-16 16:30:06 +00:00 
Merged-By: maximecb <maximecb@ruby-lang.org>
1 changed files with 46 additions and 97 deletions
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143
yjit/src/codegen.rs
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@ -1468,32 +1468,8 @@ fn gen_expandarray(
KeepCompiling
}
fn gen_getlocal_wc0(
jit: &mut JITState,
ctx: &mut Context,
asm: &mut Assembler,
_ocb: &mut OutlinedCb,
) -> CodegenStatus {
// Compute the offset from BP to the local
let slot_idx = jit_get_arg(jit, 0).as_i32();
let offs: i32 = -SIZEOF_VALUE_I32 * slot_idx;
let local_idx = slot_to_local_idx(jit.get_iseq(), slot_idx);
// Load environment pointer EP (level 0) from CFP
let ep_opnd = gen_get_ep(asm, 0);
// Load the local from the EP
let local_opnd = Opnd::mem(64, ep_opnd, offs);
// Write the local at SP
let stack_top = ctx.stack_push_local(local_idx.as_usize());
asm.mov(stack_top, local_opnd);
KeepCompiling
}
// Compute the index of a local variable from its slot index
fn slot_to_local_idx(iseq: IseqPtr, slot_idx: i32) -> u32 {
fn ep_offset_to_local_idx(iseq: IseqPtr, ep_offset: u32) -> u32 {
// Layout illustration
// This is an array of VALUE
// | VM_ENV_DATA_SIZE |
@ -1504,7 +1480,7 @@ fn slot_to_local_idx(iseq: IseqPtr, slot_idx: i32) -> u32 {
// ^ ^ ^ ^
// +-------+---local_table_size----+ cfp->ep--+
// | |
// +------------------slot_idx----------------+
// +------------------ep_offset---------------+
//
// See usages of local_var_name() from iseq.c for similar calculation.
@ -1512,7 +1488,7 @@ fn slot_to_local_idx(iseq: IseqPtr, slot_idx: i32) -> u32 {
let local_table_size: i32 = unsafe { get_iseq_body_local_table_size(iseq) }
.try_into()
.unwrap();
let op = slot_idx - (VM_ENV_DATA_SIZE as i32);
let op = (ep_offset - VM_ENV_DATA_SIZE) as i32;
let local_idx = local_table_size - op - 1;
assert!(local_idx >= 0 && local_idx < local_table_size);
local_idx.try_into().unwrap()
@ -1553,9 +1529,10 @@ fn gen_get_lep(jit: &mut JITState, asm: &mut Assembler) -> Opnd {
}
fn gen_getlocal_generic(
jit: &mut JITState,
ctx: &mut Context,
asm: &mut Assembler,
local_idx: u32,
ep_offset: u32,
level: u32,
) -> CodegenStatus {
// Load environment pointer EP (level 0) from CFP
@ -1563,11 +1540,16 @@ fn gen_getlocal_generic(
// Load the local from the block
// val = *(vm_get_ep(GET_EP(), level) - idx);
let offs = -(SIZEOF_VALUE_I32 * local_idx as i32);
let offs = -(SIZEOF_VALUE_I32 * ep_offset as i32);
let local_opnd = Opnd::mem(64, ep_opnd, offs);
// Write the local at SP
let stack_top = ctx.stack_push(Type::Unknown);
let stack_top = if level == 0 {
let local_idx = ep_offset_to_local_idx(jit.get_iseq(), ep_offset);
ctx.stack_push_local(local_idx.as_usize())
} else {
ctx.stack_push(Type::Unknown)
};
asm.mov(stack_top, local_opnd);
@ -1580,9 +1562,19 @@ fn gen_getlocal(
asm: &mut Assembler,
_ocb: &mut OutlinedCb,
) -> CodegenStatus {
let idx = jit_get_arg(jit, 0);
let level = jit_get_arg(jit, 1);
gen_getlocal_generic(ctx, asm, idx.as_u32(), level.as_u32())
let idx = jit_get_arg(jit, 0).as_u32();
let level = jit_get_arg(jit, 1).as_u32();
gen_getlocal_generic(jit, ctx, asm, idx, level)
}
fn gen_getlocal_wc0(
jit: &mut JITState,
ctx: &mut Context,
asm: &mut Assembler,
_ocb: &mut OutlinedCb,
) -> CodegenStatus {
let idx = jit_get_arg(jit, 0).as_u32();
gen_getlocal_generic(jit, ctx, asm, idx, 0)
}
fn gen_getlocal_wc1(
@ -1591,66 +1583,8 @@ fn gen_getlocal_wc1(
asm: &mut Assembler,
_ocb: &mut OutlinedCb,
) -> CodegenStatus {
let idx = jit_get_arg(jit, 0);
gen_getlocal_generic(ctx, asm, idx.as_u32(), 1)
}
fn gen_setlocal_wc0(
jit: &mut JITState,
ctx: &mut Context,
asm: &mut Assembler,
ocb: &mut OutlinedCb,
) -> CodegenStatus {
/*
vm_env_write(const VALUE *ep, int index, VALUE v)
{
VALUE flags = ep[VM_ENV_DATA_INDEX_FLAGS];
if (LIKELY((flags & VM_ENV_FLAG_WB_REQUIRED) == 0)) {
VM_STACK_ENV_WRITE(ep, index, v);
}
else {
vm_env_write_slowpath(ep, index, v);
}
}
*/
let slot_idx = jit_get_arg(jit, 0).as_i32();
let local_idx = slot_to_local_idx(jit.get_iseq(), slot_idx).as_usize();
let value_type = ctx.get_opnd_type(StackOpnd(0));
// Load environment pointer EP (level 0) from CFP
let ep_opnd = gen_get_ep(asm, 0);
// Write barriers may be required when VM_ENV_FLAG_WB_REQUIRED is set, however write barriers
// only affect heap objects being written. If we know an immediate value is being written we
// can skip this check.
if !value_type.is_imm() {
// flags & VM_ENV_FLAG_WB_REQUIRED
let flags_opnd = Opnd::mem(
64,
ep_opnd,
SIZEOF_VALUE_I32 * VM_ENV_DATA_INDEX_FLAGS as i32,
);
asm.test(flags_opnd, VM_ENV_FLAG_WB_REQUIRED.into());
// Create a side-exit to fall back to the interpreter
let side_exit = get_side_exit(jit, ocb, ctx);
// if (flags & VM_ENV_FLAG_WB_REQUIRED) != 0
asm.jnz(side_exit);
}
// Set the type of the local variable in the context
ctx.set_local_type(local_idx, value_type);
// Pop the value to write from the stack
let stack_top = ctx.stack_pop(1);
// Write the value at the environment pointer
let offs: i32 = -8 * slot_idx;
asm.mov(Opnd::mem(64, ep_opnd, offs), stack_top);
KeepCompiling
let idx = jit_get_arg(jit, 0).as_u32();
gen_getlocal_generic(jit, ctx, asm, idx, 1)
}
fn gen_setlocal_generic(
@ -1658,7 +1592,7 @@ fn gen_setlocal_generic(
ctx: &mut Context,
asm: &mut Assembler,
ocb: &mut OutlinedCb,
local_idx: i32,
ep_offset: u32,
level: u32,
) -> CodegenStatus {
let value_type = ctx.get_opnd_type(StackOpnd(0));
@ -1685,11 +1619,16 @@ fn gen_setlocal_generic(
asm.jnz(side_exit);
}
if level == 0 {
let local_idx = ep_offset_to_local_idx(jit.get_iseq(), ep_offset).as_usize();
ctx.set_local_type(local_idx, value_type);
}
// Pop the value to write from the stack
let stack_top = ctx.stack_pop(1);
// Write the value at the environment pointer
let offs = -(SIZEOF_VALUE_I32 * local_idx);
let offs = -(SIZEOF_VALUE_I32 * ep_offset as i32);
asm.mov(Opnd::mem(64, ep_opnd, offs), stack_top);
KeepCompiling
@ -1701,18 +1640,28 @@ fn gen_setlocal(
asm: &mut Assembler,
ocb: &mut OutlinedCb,
) -> CodegenStatus {
let idx = jit_get_arg(jit, 0).as_i32();
let idx = jit_get_arg(jit, 0).as_u32();
let level = jit_get_arg(jit, 1).as_u32();
gen_setlocal_generic(jit, ctx, asm, ocb, idx, level)
}
fn gen_setlocal_wc0(
jit: &mut JITState,
ctx: &mut Context,
asm: &mut Assembler,
ocb: &mut OutlinedCb,
) -> CodegenStatus {
let idx = jit_get_arg(jit, 0).as_u32();
gen_setlocal_generic(jit, ctx, asm, ocb, idx, 0)
}
fn gen_setlocal_wc1(
jit: &mut JITState,
ctx: &mut Context,
asm: &mut Assembler,
ocb: &mut OutlinedCb,
) -> CodegenStatus {
let idx = jit_get_arg(jit, 0).as_i32();
let idx = jit_get_arg(jit, 0).as_u32();
gen_setlocal_generic(jit, ctx, asm, ocb, idx, 1)
}