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Implement static analysis of unformed usage on local variables. (#1831)

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- An introprocedural forward analysis that checks the may-be-formed states on local variables.
 - Returns compilation error on usage of must-be-unformed variables. 
 - Implemented as a pass of `ASTNode` traversal. 
 - Currently supports detection of: function parameter, return expression and rhs of assign.
This commit is contained in:
Zenong Zhang
2022-08-03 15:28:51 -07:00
committed by GitHub
parent 094311133d
commit 2f4905bf70
10 changed files with 292 additions and 8 deletions
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explorer/testdata/basic_syntax/trace.carbon
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+2 -1
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@@ -13,7 +13,8 @@
// CHECK: interface ImplicitAs {
// CHECK: ********** type checking **********
// CHECK: ** declaring interface ImplicitAs
// CHECK: ********** type checking complete **********
// CHECK: ********** resolving unformed variables **********
// CHECK: ********** printing declarations **********
// CHECK: interface ImplicitAs {
// CHECK: ********** starting execution **********
// CHECK: ********** initializing globals **********
explorer/testdata/uninitialized/fail_local_uninitialized_assign.carbon
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+1 -1
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@@ -13,7 +13,7 @@ package ExplorerTest api;
fn Main() -> i32 {
var x: i32;
var y: i32;
// CHECK: RUNTIME ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_assign.carbon:[[@LINE+1]]: undefined behavior: access to uninitialized value Uninit<Placeholder<x>>
// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_assign.carbon:[[@LINE+1]]: use of uninitialized variable x
y = x;
return y;
}
explorer/testdata/uninitialized/fail_local_uninitialized_init.carbon
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+1 -1
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@@ -12,7 +12,7 @@ package ExplorerTest api;
fn Main() -> i32 {
var x: i32;
// CHECK: RUNTIME ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_init.carbon:[[@LINE+1]]: undefined behavior: access to uninitialized value Uninit<Placeholder<x>>
var y: i32 = x;
// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_init.carbon:[[@LINE+1]]: use of uninitialized variable x
return x;
}
explorer/testdata/uninitialized/fail_local_uninitialized_param.carbon
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+1 -1
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@@ -16,6 +16,6 @@ fn AddInt(a: i32, b: i32) -> auto {
fn Main() -> i32 {
var x: i32;
// CHECK: RUNTIME ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_param.carbon:[[@LINE+1]]: undefined behavior: access to uninitialized value Uninit<Placeholder<x>>
// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_param.carbon:[[@LINE+1]]: use of uninitialized variable x
return AddInt(x, 2);
}
explorer/testdata/uninitialized/fail_local_uninitialized_pattern.carbon
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+1 -1
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@@ -13,6 +13,6 @@ package ExplorerTest api;
fn Main() -> i32 {
var (x: i32, y: i32);
x = 1;
// CHECK: RUNTIME ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_pattern.carbon:[[@LINE+1]]: undefined behavior: access to uninitialized value Uninit<Placeholder<y>>
// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_pattern.carbon:[[@LINE+1]]: use of uninitialized variable y
return y;
}
explorer/testdata/uninitialized/fail_local_uninitialized_return.carbon
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+1 -1
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@@ -12,6 +12,6 @@ package ExplorerTest api;
fn Main() -> i32 {
var x: i32;
// CHECK: RUNTIME ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_return.carbon:[[@LINE+1]]: undefined behavior: access to uninitialized value Uninit<Placeholder<x>>
// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/uninitialized/fail_local_uninitialized_return.carbon:[[@LINE+1]]: use of uninitialized variable x
return x;
}