a268bda0da
This makes the type checker handle blocks with input parameters and return types, branches, and polymorphic stacks correctly. We maintain the stack of "block info", which contains its input parameter type, return type, and whether it is a loop or not. And this is used when checking the validity of the value stack at the `end` marker and all branches targeting the block. `StackType` now supports a new variant `Polymorphic`, which indicates the stack is in the polymorphic state. `Polymorphic`s are not popped even when `popType` is executed; they are only popped when the current block ends. When popping from the value stack, we ensure we don't pop more than we are allowed to at the given block level and print appropriate error messages instead. Also after a block ends, the value stack is guaranteed to have the right types based on the block return type. For example, ```wast block i32 unreachable end_block ;; You can expect to have an i32 on the stack here ``` This also adds handling for `br_if`. Previously only `br`s were checked. `checkEnd` and `checkBr` were removed and their contents have been inlined to the main `typeCheck` function, because they are called only from a single callsite. This also fixes two existing bugs in AsmParser, which were required to make the tests passing. I added Github comments about them inline. This modifies several existing invalid tests, those that passed (incorrectly) before but do not pass with the new type checker anymore. Fixes #107524.
183 lines
4.3 KiB
ArmAsm
183 lines
4.3 KiB
ArmAsm
# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+exception-handling < %s | FileCheck %s
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# Check that it converts to .o without errors, but don't check any output:
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# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+exception-handling -filetype=obj -o %t.o < %s
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.tagtype __cpp_exception i32
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block_branch_test:
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.functype block_branch_test () -> ()
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# Block input paramter / return tests
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i32.const 0
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block (i32) -> (i32)
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end_block
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drop
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i32.const 0
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i64.const 0
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block (i32, i64) -> (i32, f32)
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drop
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f32.const 0.0
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end_block
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drop
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drop
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i32.const 0
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loop (i32) -> (f32)
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drop
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f32.const 0.0
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end_loop
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drop
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i32.const 0
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i32.const 0
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if (i32) -> (i32)
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else
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i32.popcnt
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end_if
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drop
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try i32
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i32.const 0
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catch __cpp_exception
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i32.clz
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catch_all
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i32.const 5
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end_try
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drop
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i32.const 0
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block (i32) -> (i32)
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block (i32) -> (f32)
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drop
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f32.const 0.0
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end_block
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drop
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i32.const 0
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end_block
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drop
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# Branch tests
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block f32
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f32.const 0.0
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i32.const 0
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br_if 0
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f32.const 1.0
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br 0
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# After 'br', we can pop any values from the polymorphic stack
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i32.add
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i32.sub
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i32.mul
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drop
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end_block
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drop
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block () -> (f32, f64)
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f32.const 0.0
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f64.const 0.0
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i32.const 0
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br_if 0
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block (f32, f64) -> (f32, f64)
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i32.const 1
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br_if 0
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end_block
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end_block
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drop
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drop
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# Within a loop, branches target the start of the loop
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i32.const 0
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loop (i32) -> ()
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i32.const 1
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br 0
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end_loop
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end_function
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# CHECK-LABEL: block_branch_test
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# CHECK: i32.const 0
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# CHECK-NEXT: block (i32) -> (i32)
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# CHECK-NEXT: end_block # label0:
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# CHECK-NEXT: drop
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# CHECK: i32.const 0
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# CHECK-NEXT: i64.const 0
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# CHECK-NEXT: block (i32, i64) -> (i32, f32)
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# CHECK-NEXT: drop
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# CHECK-NEXT: f32.const 0x0p0
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# CHECK-NEXT: end_block # label1:
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# CHECK-NEXT: drop
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# CHECK-NEXT: drop
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# CHECK: i32.const 0
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# CHECK-NEXT: loop (i32) -> (f32) # label2:
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# CHECK-NEXT: drop
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# CHECK-NEXT: f32.const 0x0p0
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# CHECK-NEXT: end_loop
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# CHECK-NEXT: drop
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# CHECK: i32.const 0
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: if (i32) -> (i32)
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# CHECK-NEXT: else
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# CHECK-NEXT: i32.popcnt
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# CHECK-NEXT: end_if
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# CHECK-NEXT: drop
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# CHECK: try i32
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: catch __cpp_exception # catch3:
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# CHECK-NEXT: i32.clz
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# CHECK-NEXT: catch_all
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# CHECK-NEXT: i32.const 5
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# CHECK-NEXT: end_try # label3:
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# CHECK-NEXT: drop
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# CHECK: i32.const 0
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# CHECK-NEXT: block (i32) -> (i32)
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# CHECK-NEXT: block (i32) -> (f32)
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# CHECK-NEXT: drop
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# CHECK-NEXT: f32.const 0x0p0
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# CHECK-NEXT: end_block # label5:
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# CHECK-NEXT: drop
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: end_block # label4:
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# CHECK-NEXT: drop
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# CHECK: block f32
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# CHECK-NEXT: f32.const 0x0p0
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: br_if 0 # 0: down to label6
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# CHECK-NEXT: f32.const 0x1p0
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# CHECK-NEXT: br 0 # 0: down to label6
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# CHECK-NEXT: i32.add
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# CHECK-NEXT: i32.sub
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# CHECK-NEXT: i32.mul
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# CHECK-NEXT: drop
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# CHECK-NEXT: end_block # label6:
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# CHECK-NEXT: drop
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# CHECK: block () -> (f32, f64)
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# CHECK-NEXT: f32.const 0x0p0
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# CHECK-NEXT: f64.const 0x0p0
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# CHECK-NEXT: i32.const 0
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# CHECK-NEXT: br_if 0 # 0: down to label7
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# CHECK-NEXT: block (f32, f64) -> (f32, f64)
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# CHECK-NEXT: i32.const 1
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# CHECK-NEXT: br_if 0 # 0: down to label8
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# CHECK-NEXT: end_block # label8:
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# CHECK-NEXT: end_block # label7:
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# CHECK-NEXT: drop
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# CHECK-NEXT: drop
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# CHECK: i32.const 0
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# CHECK-NEXT: loop (i32) -> () # label9:
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# CHECK-NEXT: i32.const 1
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# CHECK-NEXT: br 0 # 0: up to label9
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# CHECK-NEXT: end_loop
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# CHECK: end_function
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