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Remove the concept of non-dense jump tables.

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WebAssembly doesn't have non-dense jump tables, and higher-level users
are better served by the facilities in lib/frontend/src/switch.rs for
working with non-dense switches.

This eliminates the concept of "absent" jump table entries, which
were represented as "0" in the text format.

Also, jump table contents are now enclosed in `[` and `]`, so that
we can unambiguously display empty jump tables. Previously, empty jump
tables were displayed as if they had a single absent entry.
This commit is contained in:
Dan Gohman
2018-10-04 10:35:31 -07:00
parent dc9221a70c
commit 1098eafb45
22 changed files with 113 additions and 208 deletions
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8
cranelift/filetests/parser/branch.clif
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@@ -81,8 +81,8 @@ ebb1(v92: i32, v93: f32):
; nextln: }
function %jumptable(i32) {
jt200 = jump_table 0, 0
jt2 = jump_table 0, 0, ebb10, ebb40, ebb20, ebb30
jt200 = jump_table []
jt2 = jump_table [ebb10, ebb40, ebb20, ebb30]
ebb10(v3: i32):
br_table v3, ebb50, jt2
@@ -97,8 +97,8 @@ ebb50:
trap user1
}
; sameln: function %jumptable(i32) fast {
; check: jt2 = jump_table 0, 0, ebb10, ebb40, ebb20, ebb30
; check: jt200 = jump_table 0
; check: jt2 = jump_table [ebb10, ebb40, ebb20, ebb30]
; check: jt200 = jump_table []
; check: ebb10(v3: i32):
; nextln: br_table v3, ebb50, jt2
; nextln: