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Add a start-of-file token and parse node. (#3263)

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This removes a (very) hot branch in the lexer where we need to special
case when a token is the first token and can't look at its previous
token. It also seems like a generally nice change to the structure of
both the token buffer and parse tree as there are now bracketing
elements for both ends and we should be able to avoid similar branching
in the future.

Mostly mechanical updates to the lexer and parser code to handle this,
but also needed to special case the location information in the
autoupdate code. And then the usual large body of auto-updated tests.

No benchmark data for this change alone as in isolation and in the
current lexer structure it doesn't make a big difference. But this
branch was particularly difficult to handle when trying to update the
whitespace skipping code to be faster, and so I think it is worth
systematically avoiding the special case here.
This commit is contained in:
Chandler Carruth
2023-10-04 23:36:35 +00:00
committed by GitHub
parent 412e4fb461
commit a46ca6bf7a
208 changed files with 482 additions and 209 deletions
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toolchain/parse/testdata/struct/fail_comma_only.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {,} = {};
// CHECK:STDOUT: - filename: fail_comma_only.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_comma_repeat_in_type.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a: i32,,} = {};
// CHECK:STDOUT: - filename: fail_comma_repeat_in_type.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_comma_repeat_in_value.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a = 0,,} = {};
// CHECK:STDOUT: - filename: fail_comma_repeat_in_value.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_dot_only.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.} = {};
// CHECK:STDOUT: - filename: fail_dot_only.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_dot_string_colon.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {."hello": i32, .y: i32} = {};
// CHECK:STDOUT: - filename: fail_dot_string_colon.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_dot_string_equals.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {."hello" = 0, .y = 4} = {};
// CHECK:STDOUT: - filename: fail_dot_string_equals.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_extra_token_in_type.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a: i32 banana} = {.a = 0};
// CHECK:STDOUT: - filename: fail_extra_token_in_type.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_extra_token_in_value.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a: i32} = {.a = 0 banana};
// CHECK:STDOUT: - filename: fail_extra_token_in_value.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_identifier_colon.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {a:} = {};
// CHECK:STDOUT: - filename: fail_identifier_colon.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_identifier_equals.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {a=} = {};
// CHECK:STDOUT: - filename: fail_identifier_equals.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_identifier_only.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {a} = {};
// CHECK:STDOUT: - filename: fail_identifier_only.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_missing_type.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a:} = {};
// CHECK:STDOUT: - filename: fail_missing_type.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_missing_value.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a=} = {};
// CHECK:STDOUT: - filename: fail_missing_value.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_mix_type_and_value.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a: i32, .b = 0} = {};
// CHECK:STDOUT: - filename: fail_mix_type_and_value.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_mix_value_and_type.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a = 0, b: i32} = {};
// CHECK:STDOUT: - filename: fail_mix_value_and_type.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_mix_with_unknown.carbon
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+1
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@@ -22,6 +22,7 @@ var x: i32 = {.a: i32, .b, .c = 1};
// CHECK:STDOUT: - filename: fail_mix_with_unknown.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'Literal', text: 'i32'},
toolchain/parse/testdata/struct/fail_no_colon_or_equals.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {.a} = {};
// CHECK:STDOUT: - filename: fail_no_colon_or_equals.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/fail_type_no_designator.carbon
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+1
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@@ -11,6 +11,7 @@ var x: {i32} = {};
// CHECK:STDOUT: - filename: fail_type_no_designator.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/no_entries.carbon
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@@ -8,6 +8,7 @@ var y: {} = {};
// CHECK:STDOUT: - filename: no_entries.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'y'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/one_entry_no_comma.carbon
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@@ -8,6 +8,7 @@ var z: {.n: i32} = {.n = 4};
// CHECK:STDOUT: - filename: one_entry_no_comma.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'z'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/one_entry_with_comma.carbon
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+1
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@@ -8,6 +8,7 @@ var z: {.n: i32,} = {.n = 4,};
// CHECK:STDOUT: - filename: one_entry_with_comma.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'z'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},
toolchain/parse/testdata/struct/two_entries.carbon
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+1
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@@ -8,6 +8,7 @@ var x: {.a: i32, .b: i32} = {.a = 1, .b = 2};
// CHECK:STDOUT: - filename: two_entries.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'x'},
// CHECK:STDOUT: {kind: 'StructLiteralOrStructTypeLiteralStart', text: '{'},