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Add implied return; at end of non-value-returning functions. (#2942)

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Add validation that every code block in a function is terminated by a sequence of terminating instructions, and that terminators don't appear anywhere else in code blocks.

This required tracking whether we're in a reachable code block. That's done on the fly when we create a new code block; the new `SemanticsNodeBlockId::Unreachable` is used to represent the case where we're not actually creating a code block because we're in unreachable code.
This commit is contained in:
Richard Smith
2023-06-26 15:17:47 -07:00
committed by GitHub
parent 92d73985df
commit 4b69264cb1
76 changed files with 1150 additions and 302 deletions
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toolchain/semantics/testdata/function/call/empty_struct.carbon
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@@ -33,6 +33,7 @@
// CHECK:STDOUT: {kind: StructValue, arg0: block0, type: type0},
// CHECK:STDOUT: {kind: StubReference, arg0: node+8, type: type0},
// CHECK:STDOUT: {kind: Call, arg0: block6, arg1: function0, type: type0},
// CHECK:STDOUT: {kind: Return},
// CHECK:STDOUT: ]
// CHECK:STDOUT: node_blocks: [
// CHECK:STDOUT: [
@@ -58,6 +59,7 @@
// CHECK:STDOUT: node+8,
// CHECK:STDOUT: node+9,
// CHECK:STDOUT: node+10,
// CHECK:STDOUT: node+11,
// CHECK:STDOUT: ],
// CHECK:STDOUT: [
// CHECK:STDOUT: node+9,