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Support heaps with no offset-guard pages.

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Also, say "guard-offset pages" rather than just "guard pages" to describe the
region of a heap which is never accessible and which exists to support
optimizations for heap accesses with offsets.

And, introduce a `Uimm64` immediate type, and make all heap fields use
`Uimm64` instead of `Imm64` since they really are unsigned.
This commit is contained in:
Dan Gohman
2018-11-29 04:53:30 -08:00
parent 93696a80bb
commit a20c852148
27 changed files with 302 additions and 172 deletions
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6
cranelift/filetests/isa/x86/legalize-memory.clif
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@@ -47,7 +47,7 @@ ebb1:
function %staticheap_sm64(i32, i64 vmctx) -> f32 baldrdash {
gv0 = vmctx
gv1 = iadd_imm.i64 gv0, 64
heap0 = static gv1, min 0x1000, bound 0x1_0000_0000, guard 0x8000_0000
heap0 = static gv1, min 0x1000, bound 0x1_0000_0000, offset_guard 0x8000_0000
ebb0(v0: i32, v999: i64):
; check: ebb0(
@@ -68,7 +68,7 @@ ebb0(v0: i32, v999: i64):
function %staticheap_static_oob_sm64(i32, i64 vmctx) -> f32 baldrdash {
gv0 = vmctx
gv1 = iadd_imm.i64 gv0, 64
heap0 = static gv1, min 0x1000, bound 0x1000_0000, guard 0x8000_0000
heap0 = static gv1, min 0x1000, bound 0x1000_0000, offset_guard 0x8000_0000
ebb0(v0: i32, v999: i64):
; Everything after the obviously OOB access should be eliminated, leaving
@@ -92,7 +92,7 @@ ebb0(v0: i32, v999: i64):
function %staticheap_sm64(i32, i64 vmctx) -> f32 baldrdash {
gv0 = vmctx
gv1 = iadd_imm.i64 gv0, 64
heap0 = static gv1, min 0x1000, bound 0x1_0000_0000, guard 0x8000_0000
heap0 = static gv1, min 0x1000, bound 0x1_0000_0000, offset_guard 0x8000_0000
ebb0(v0: i32, v999: i64):
; check: ebb0(