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Make singlepass backend emit state mapping information.

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This commit is contained in:
losfair
2019-06-12 00:21:43 +08:00
parent da9bf05218
commit ddd0653a25
3 changed files with 155 additions and 80 deletions
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6
lib/runtime-core/src/state.rs
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@ -19,6 +19,8 @@ pub struct MachineStateDiff {
pub enum MachineValue {
Undefined,
PreserveRegister(RegisterIndex),
CopyStackBPRelative(i32), // relative to Base Pointer, in byte offset
ExplicitShadow, // indicates that all values above this are above the shadow region
WasmStack(usize),
WasmLocal(usize),
}
@ -26,13 +28,15 @@ pub enum MachineValue {
#[derive(Clone, Debug)]
pub struct FunctionStateMap {
pub initial: MachineState,
pub shadow_size: usize, // for single-pass backend, 32 bytes on x86-64
pub diffs: Vec<MachineStateDiff>,
}
impl FunctionStateMap {
pub fn new(initial: MachineState) -> FunctionStateMap {
pub fn new(initial: MachineState, shadow_size: usize) -> FunctionStateMap {
FunctionStateMap {
initial,
shadow_size,
diffs: vec![],
}
}