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Implement jump tables (#453)

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* Add 'jump_table_entry' and 'indirect_jump' instructions.

* Update CodeSink to keep track of code size. Pretty up clif-util's disassembly output.

* Only disassemble the machine portion of output. Pretty print the read-only data after it.

* Update switch frontend code to use new br_table instruction w/ default.
This commit is contained in:
Tyler McMullen
2018-10-03 11:04:21 -06:00
committed by Dan Gohman
parent de1d82b4ba
commit 79cea5e18b
39 changed files with 627 additions and 100 deletions
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12
cranelift/filetests/parser/branch.clif
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@@ -85,21 +85,22 @@ function %jumptable(i32) {
jt2 = jump_table 0, 0, ebb10, ebb40, ebb20, ebb30
ebb10(v3: i32):
br_table v3, jt2
trap user1
br_table v3, ebb50, jt2
ebb20:
trap user2
ebb30:
trap user3
ebb40:
trap user4
ebb50:
trap user1
}
; sameln: function %jumptable(i32) fast {
; check: jt2 = jump_table 0, 0, ebb10, ebb40, ebb20, ebb30
; check: jt200 = jump_table 0
; check: ebb10(v3: i32):
; nextln: br_table v3, jt2
; nextln: trap user1
; nextln: br_table v3, ebb50, jt2
; nextln:
; nextln: ebb20:
; nextln: trap user2
@@ -109,4 +110,7 @@ ebb40:
; nextln:
; nextln: ebb40:
; nextln: trap user4
; nextln:
; nextln: ebb50:
; nextln: trap user1
; nextln: }