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Introduce a TargetFrontendConfig type. (#570)

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* Introduce a `TargetFrontendConfig` type.

`TargetFrontendConfig` is information specific to the target which is
provided to frontends to allow them to produce Cranelift IR for the
target. Currently this includes the pointer size and the default calling
convention.

The default calling convention is now inferred from the target, rather
than being a setting. cranelift-native is now just a provider of target
information, rather than also being a provider of settings, which gives
it a clearer role.

And instead of having cranelift-frontend routines require the whole
`TargetIsa`, just require the `TargetFrontendConfig`, and add a way to
get the `TargetFrontendConfig` from a `Module`.

Fixes #529.
Fixes #555.
This commit is contained in:
Dan Gohman
2018-11-02 13:51:42 -07:00
committed by GitHub
parent 7094d9f470
commit d4f8eb7453
27 changed files with 297 additions and 168 deletions
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9
lib/codegen/src/isa/x86/abi.rs
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@@ -10,10 +10,9 @@ use ir::{
get_probestack_funcref, AbiParam, ArgumentExtension, ArgumentLoc, ArgumentPurpose, InstBuilder,
ValueLoc,
};
use isa::{RegClass, RegUnit, TargetIsa};
use isa::{CallConv, RegClass, RegUnit, TargetIsa};
use regalloc::RegisterSet;
use result::CodegenResult;
use settings::CallConv;
use stack_layout::layout_stack;
use std::i32;
use target_lexicon::{PointerWidth, Triple};
@@ -189,12 +188,12 @@ pub fn allocatable_registers(_func: &ir::Function, triple: &Triple) -> RegisterS
}
/// Get the set of callee-saved registers.
fn callee_saved_gprs(isa: &TargetIsa) -> &'static [RU] {
fn callee_saved_gprs(isa: &TargetIsa, call_conv: CallConv) -> &'static [RU] {
match isa.triple().pointer_width().unwrap() {
PointerWidth::U16 => panic!(),
PointerWidth::U32 => &[RU::rbx, RU::rsi, RU::rdi],
PointerWidth::U64 => {
if isa.flags().call_conv() == CallConv::WindowsFastcall {
if call_conv == CallConv::WindowsFastcall {
// "registers RBX, RBP, RDI, RSI, RSP, R12, R13, R14, R15 are considered nonvolatile
// and must be saved and restored by a function that uses them."
// as per https://msdn.microsoft.com/en-us/library/6t169e9c.aspx
@@ -219,7 +218,7 @@ fn callee_saved_gprs(isa: &TargetIsa) -> &'static [RU] {
/// Get the set of callee-saved registers that are used.
fn callee_saved_gprs_used(isa: &TargetIsa, func: &ir::Function) -> RegisterSet {
let mut all_callee_saved = RegisterSet::empty();
for reg in callee_saved_gprs(isa) {
for reg in callee_saved_gprs(isa, func.signature.call_conv) {
all_callee_saved.free(GPR, *reg as RegUnit);
}